diff options
Diffstat (limited to 'kernel/drivers/scsi/scsi_debug.c')
| -rw-r--r-- | kernel/drivers/scsi/scsi_debug.c | 5462 |
1 files changed, 5462 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/scsi_debug.c b/kernel/drivers/scsi/scsi_debug.c new file mode 100644 index 000000000..1f8e2dc9c --- /dev/null +++ b/kernel/drivers/scsi/scsi_debug.c @@ -0,0 +1,5462 @@ +/* + * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv + * Copyright (C) 1992 Eric Youngdale + * Simulate a host adapter with 2 disks attached. Do a lot of checking + * to make sure that we are not getting blocks mixed up, and PANIC if + * anything out of the ordinary is seen. + * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + * + * This version is more generic, simulating a variable number of disk + * (or disk like devices) sharing a common amount of RAM. To be more + * realistic, the simulated devices have the transport attributes of + * SAS disks. + * + * + * For documentation see http://sg.danny.cz/sg/sdebug26.html + * + * D. Gilbert (dpg) work for Magneto-Optical device test [20010421] + * dpg: work for devfs large number of disks [20010809] + * forked for lk 2.5 series [20011216, 20020101] + * use vmalloc() more inquiry+mode_sense [20020302] + * add timers for delayed responses [20020721] + * Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031] + * Mike Anderson <andmike@us.ibm.com> sysfs work [20021118] + * dpg: change style of boot options to "scsi_debug.num_tgts=2" and + * module options to "modprobe scsi_debug num_tgts=2" [20021221] + */ + +#include <linux/module.h> + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/timer.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/genhd.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/vmalloc.h> +#include <linux/moduleparam.h> +#include <linux/scatterlist.h> +#include <linux/blkdev.h> +#include <linux/crc-t10dif.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/atomic.h> +#include <linux/hrtimer.h> + +#include <net/checksum.h> + +#include <asm/unaligned.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include <scsi/scsicam.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_dbg.h> + +#include "sd.h" +#include "scsi_logging.h" + +#define SCSI_DEBUG_VERSION "1.85" +static const char *scsi_debug_version_date = "20141022"; + +#define MY_NAME "scsi_debug" + +/* Additional Sense Code (ASC) */ +#define NO_ADDITIONAL_SENSE 0x0 +#define LOGICAL_UNIT_NOT_READY 0x4 +#define LOGICAL_UNIT_COMMUNICATION_FAILURE 0x8 +#define UNRECOVERED_READ_ERR 0x11 +#define PARAMETER_LIST_LENGTH_ERR 0x1a +#define INVALID_OPCODE 0x20 +#define LBA_OUT_OF_RANGE 0x21 +#define INVALID_FIELD_IN_CDB 0x24 +#define INVALID_FIELD_IN_PARAM_LIST 0x26 +#define UA_RESET_ASC 0x29 +#define UA_CHANGED_ASC 0x2a +#define TARGET_CHANGED_ASC 0x3f +#define LUNS_CHANGED_ASCQ 0x0e +#define INSUFF_RES_ASC 0x55 +#define INSUFF_RES_ASCQ 0x3 +#define POWER_ON_RESET_ASCQ 0x0 +#define BUS_RESET_ASCQ 0x2 /* scsi bus reset occurred */ +#define MODE_CHANGED_ASCQ 0x1 /* mode parameters changed */ +#define CAPACITY_CHANGED_ASCQ 0x9 +#define SAVING_PARAMS_UNSUP 0x39 +#define TRANSPORT_PROBLEM 0x4b +#define THRESHOLD_EXCEEDED 0x5d +#define LOW_POWER_COND_ON 0x5e +#define MISCOMPARE_VERIFY_ASC 0x1d +#define MICROCODE_CHANGED_ASCQ 0x1 /* with TARGET_CHANGED_ASC */ +#define MICROCODE_CHANGED_WO_RESET_ASCQ 0x16 + +/* Additional Sense Code Qualifier (ASCQ) */ +#define ACK_NAK_TO 0x3 + + +/* Default values for driver parameters */ +#define DEF_NUM_HOST 1 +#define DEF_NUM_TGTS 1 +#define DEF_MAX_LUNS 1 +/* With these defaults, this driver will make 1 host with 1 target + * (id 0) containing 1 logical unit (lun 0). That is 1 device. + */ +#define DEF_ATO 1 +#define DEF_DELAY 1 /* if > 0 unit is a jiffy */ +#define DEF_DEV_SIZE_MB 8 +#define DEF_DIF 0 +#define DEF_DIX 0 +#define DEF_D_SENSE 0 +#define DEF_EVERY_NTH 0 +#define DEF_FAKE_RW 0 +#define DEF_GUARD 0 +#define DEF_HOST_LOCK 0 +#define DEF_LBPU 0 +#define DEF_LBPWS 0 +#define DEF_LBPWS10 0 +#define DEF_LBPRZ 1 +#define DEF_LOWEST_ALIGNED 0 +#define DEF_NDELAY 0 /* if > 0 unit is a nanosecond */ +#define DEF_NO_LUN_0 0 +#define DEF_NUM_PARTS 0 +#define DEF_OPTS 0 +#define DEF_OPT_BLKS 64 +#define DEF_PHYSBLK_EXP 0 +#define DEF_PTYPE 0 +#define DEF_REMOVABLE false +#define DEF_SCSI_LEVEL 6 /* INQUIRY, byte2 [6->SPC-4] */ +#define DEF_SECTOR_SIZE 512 +#define DEF_UNMAP_ALIGNMENT 0 +#define DEF_UNMAP_GRANULARITY 1 +#define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF +#define DEF_UNMAP_MAX_DESC 256 +#define DEF_VIRTUAL_GB 0 +#define DEF_VPD_USE_HOSTNO 1 +#define DEF_WRITESAME_LENGTH 0xFFFF +#define DEF_STRICT 0 +#define DELAY_OVERRIDDEN -9999 + +/* bit mask values for scsi_debug_opts */ +#define SCSI_DEBUG_OPT_NOISE 1 +#define SCSI_DEBUG_OPT_MEDIUM_ERR 2 +#define SCSI_DEBUG_OPT_TIMEOUT 4 +#define SCSI_DEBUG_OPT_RECOVERED_ERR 8 +#define SCSI_DEBUG_OPT_TRANSPORT_ERR 16 +#define SCSI_DEBUG_OPT_DIF_ERR 32 +#define SCSI_DEBUG_OPT_DIX_ERR 64 +#define SCSI_DEBUG_OPT_MAC_TIMEOUT 128 +#define SCSI_DEBUG_OPT_SHORT_TRANSFER 0x100 +#define SCSI_DEBUG_OPT_Q_NOISE 0x200 +#define SCSI_DEBUG_OPT_ALL_TSF 0x400 +#define SCSI_DEBUG_OPT_RARE_TSF 0x800 +#define SCSI_DEBUG_OPT_N_WCE 0x1000 +#define SCSI_DEBUG_OPT_RESET_NOISE 0x2000 +#define SCSI_DEBUG_OPT_NO_CDB_NOISE 0x4000 +#define SCSI_DEBUG_OPT_ALL_NOISE (0x1 | 0x200 | 0x2000) +/* When "every_nth" > 0 then modulo "every_nth" commands: + * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set + * - a RECOVERED_ERROR is simulated on successful read and write + * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. + * - a TRANSPORT_ERROR is simulated on successful read and write + * commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set. + * + * When "every_nth" < 0 then after "- every_nth" commands: + * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set + * - a RECOVERED_ERROR is simulated on successful read and write + * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set. + * - a TRANSPORT_ERROR is simulated on successful read and write + * commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set. + * This will continue until some other action occurs (e.g. the user + * writing a new value (other than -1 or 1) to every_nth via sysfs). + */ + +/* As indicated in SAM-5 and SPC-4 Unit Attentions (UAs)are returned in + * priority order. In the subset implemented here lower numbers have higher + * priority. The UA numbers should be a sequence starting from 0 with + * SDEBUG_NUM_UAS being 1 higher than the highest numbered UA. */ +#define SDEBUG_UA_POR 0 /* Power on, reset, or bus device reset */ +#define SDEBUG_UA_BUS_RESET 1 +#define SDEBUG_UA_MODE_CHANGED 2 +#define SDEBUG_UA_CAPACITY_CHANGED 3 +#define SDEBUG_UA_LUNS_CHANGED 4 +#define SDEBUG_UA_MICROCODE_CHANGED 5 /* simulate firmware change */ +#define SDEBUG_UA_MICROCODE_CHANGED_WO_RESET 6 +#define SDEBUG_NUM_UAS 7 + +/* for check_readiness() */ +#define UAS_ONLY 1 /* check for UAs only */ +#define UAS_TUR 0 /* if no UAs then check if media access possible */ + +/* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this + * sector on read commands: */ +#define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */ +#define OPT_MEDIUM_ERR_NUM 10 /* number of consecutive medium errs */ + +/* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1) + * or "peripheral device" addressing (value 0) */ +#define SAM2_LUN_ADDRESS_METHOD 0 +#define SAM2_WLUN_REPORT_LUNS 0xc101 + +/* SCSI_DEBUG_CANQUEUE is the maximum number of commands that can be queued + * (for response) at one time. Can be reduced by max_queue option. Command + * responses are not queued when delay=0 and ndelay=0. The per-device + * DEF_CMD_PER_LUN can be changed via sysfs: + * /sys/class/scsi_device/<h:c:t:l>/device/queue_depth but cannot exceed + * SCSI_DEBUG_CANQUEUE. */ +#define SCSI_DEBUG_CANQUEUE_WORDS 9 /* a WORD is bits in a long */ +#define SCSI_DEBUG_CANQUEUE (SCSI_DEBUG_CANQUEUE_WORDS * BITS_PER_LONG) +#define DEF_CMD_PER_LUN 255 + +#if DEF_CMD_PER_LUN > SCSI_DEBUG_CANQUEUE +#warning "Expect DEF_CMD_PER_LUN <= SCSI_DEBUG_CANQUEUE" +#endif + +/* SCSI opcodes (first byte of cdb) mapped onto these indexes */ +enum sdeb_opcode_index { + SDEB_I_INVALID_OPCODE = 0, + SDEB_I_INQUIRY = 1, + SDEB_I_REPORT_LUNS = 2, + SDEB_I_REQUEST_SENSE = 3, + SDEB_I_TEST_UNIT_READY = 4, + SDEB_I_MODE_SENSE = 5, /* 6, 10 */ + SDEB_I_MODE_SELECT = 6, /* 6, 10 */ + SDEB_I_LOG_SENSE = 7, + SDEB_I_READ_CAPACITY = 8, /* 10; 16 is in SA_IN(16) */ + SDEB_I_READ = 9, /* 6, 10, 12, 16 */ + SDEB_I_WRITE = 10, /* 6, 10, 12, 16 */ + SDEB_I_START_STOP = 11, + SDEB_I_SERV_ACT_IN = 12, /* 12, 16 */ + SDEB_I_SERV_ACT_OUT = 13, /* 12, 16 */ + SDEB_I_MAINT_IN = 14, + SDEB_I_MAINT_OUT = 15, + SDEB_I_VERIFY = 16, /* 10 only */ + SDEB_I_VARIABLE_LEN = 17, + SDEB_I_RESERVE = 18, /* 6, 10 */ + SDEB_I_RELEASE = 19, /* 6, 10 */ + SDEB_I_ALLOW_REMOVAL = 20, /* PREVENT ALLOW MEDIUM REMOVAL */ + SDEB_I_REZERO_UNIT = 21, /* REWIND in SSC */ + SDEB_I_ATA_PT = 22, /* 12, 16 */ + SDEB_I_SEND_DIAG = 23, + SDEB_I_UNMAP = 24, + SDEB_I_XDWRITEREAD = 25, /* 10 only */ + SDEB_I_WRITE_BUFFER = 26, + SDEB_I_WRITE_SAME = 27, /* 10, 16 */ + SDEB_I_SYNC_CACHE = 28, /* 10 only */ + SDEB_I_COMP_WRITE = 29, + SDEB_I_LAST_ELEMENT = 30, /* keep this last */ +}; + +static const unsigned char opcode_ind_arr[256] = { +/* 0x0; 0x0->0x1f: 6 byte cdbs */ + SDEB_I_TEST_UNIT_READY, SDEB_I_REZERO_UNIT, 0, SDEB_I_REQUEST_SENSE, + 0, 0, 0, 0, + SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, 0, + 0, 0, SDEB_I_INQUIRY, 0, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE, + SDEB_I_RELEASE, + 0, 0, SDEB_I_MODE_SENSE, SDEB_I_START_STOP, 0, SDEB_I_SEND_DIAG, + SDEB_I_ALLOW_REMOVAL, 0, +/* 0x20; 0x20->0x3f: 10 byte cdbs */ + 0, 0, 0, 0, 0, SDEB_I_READ_CAPACITY, 0, 0, + SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, SDEB_I_VERIFY, + 0, 0, 0, 0, 0, SDEB_I_SYNC_CACHE, 0, 0, + 0, 0, 0, SDEB_I_WRITE_BUFFER, 0, 0, 0, 0, +/* 0x40; 0x40->0x5f: 10 byte cdbs */ + 0, SDEB_I_WRITE_SAME, SDEB_I_UNMAP, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, SDEB_I_LOG_SENSE, 0, 0, + 0, 0, 0, SDEB_I_XDWRITEREAD, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE, + SDEB_I_RELEASE, + 0, 0, SDEB_I_MODE_SENSE, 0, 0, 0, 0, 0, +/* 0x60; 0x60->0x7d are reserved */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, SDEB_I_VARIABLE_LEN, +/* 0x80; 0x80->0x9f: 16 byte cdbs */ + 0, 0, 0, 0, 0, SDEB_I_ATA_PT, 0, 0, + SDEB_I_READ, SDEB_I_COMP_WRITE, SDEB_I_WRITE, 0, 0, 0, 0, 0, + 0, 0, 0, SDEB_I_WRITE_SAME, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, SDEB_I_SERV_ACT_IN, SDEB_I_SERV_ACT_OUT, +/* 0xa0; 0xa0->0xbf: 12 byte cdbs */ + SDEB_I_REPORT_LUNS, SDEB_I_ATA_PT, 0, SDEB_I_MAINT_IN, + SDEB_I_MAINT_OUT, 0, 0, 0, + SDEB_I_READ, SDEB_I_SERV_ACT_OUT, SDEB_I_WRITE, SDEB_I_SERV_ACT_IN, + 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, +/* 0xc0; 0xc0->0xff: vendor specific */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, +}; + +#define F_D_IN 1 +#define F_D_OUT 2 +#define F_D_OUT_MAYBE 4 /* WRITE SAME, NDOB bit */ +#define F_D_UNKN 8 +#define F_RL_WLUN_OK 0x10 +#define F_SKIP_UA 0x20 +#define F_DELAY_OVERR 0x40 +#define F_SA_LOW 0x80 /* cdb byte 1, bits 4 to 0 */ +#define F_SA_HIGH 0x100 /* as used by variable length cdbs */ +#define F_INV_OP 0x200 +#define F_FAKE_RW 0x400 +#define F_M_ACCESS 0x800 /* media access */ + +#define FF_RESPOND (F_RL_WLUN_OK | F_SKIP_UA | F_DELAY_OVERR) +#define FF_DIRECT_IO (F_M_ACCESS | F_FAKE_RW) +#define FF_SA (F_SA_HIGH | F_SA_LOW) + +struct sdebug_dev_info; +static int resp_inquiry(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_report_luns(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_requests(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_mode_sense(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_mode_select(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_log_sense(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_readcap(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_read_dt0(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_dt0(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_start_stop(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_readcap16(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_get_lba_status(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_report_tgtpgs(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_unmap(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_rsup_opcodes(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_rsup_tmfs(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_same_10(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_same_16(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_xdwriteread_10(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_comp_write(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_buffer(struct scsi_cmnd *, struct sdebug_dev_info *); + +struct opcode_info_t { + u8 num_attached; /* 0 if this is it (i.e. a leaf); use 0xff + * for terminating element */ + u8 opcode; /* if num_attached > 0, preferred */ + u16 sa; /* service action */ + u32 flags; /* OR-ed set of SDEB_F_* */ + int (*pfp)(struct scsi_cmnd *, struct sdebug_dev_info *); + const struct opcode_info_t *arrp; /* num_attached elements or NULL */ + u8 len_mask[16]; /* len=len_mask[0], then mask for cdb[1]... */ + /* ignore cdb bytes after position 15 */ +}; + +static const struct opcode_info_t msense_iarr[1] = { + {0, 0x1a, 0, F_D_IN, NULL, NULL, + {6, 0xe8, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t mselect_iarr[1] = { + {0, 0x15, 0, F_D_OUT, NULL, NULL, + {6, 0xf1, 0, 0, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t read_iarr[3] = { + {0, 0x28, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, NULL,/* READ(10) */ + {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, + {0, 0x8, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, NULL, /* READ(6) */ + {6, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0xa8, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, NULL,/* READ(12) */ + {12, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x9f, + 0xc7, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t write_iarr[3] = { + {0, 0x2a, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, NULL, /* 10 */ + {10, 0xfb, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, + {0, 0xa, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, NULL, /* 6 */ + {6, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0xaa, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, NULL, /* 12 */ + {12, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x9f, + 0xc7, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t sa_in_iarr[1] = { + {0, 0x9e, 0x12, F_SA_LOW | F_D_IN, resp_get_lba_status, NULL, + {16, 0x12, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0, 0xc7} }, +}; + +static const struct opcode_info_t vl_iarr[1] = { /* VARIABLE LENGTH */ + {0, 0x7f, 0xb, F_SA_HIGH | F_D_OUT | FF_DIRECT_IO, resp_write_dt0, + NULL, {32, 0xc7, 0, 0, 0, 0, 0x1f, 0x18, 0x0, 0xb, 0xfa, + 0, 0xff, 0xff, 0xff, 0xff} }, /* WRITE(32) */ +}; + +static const struct opcode_info_t maint_in_iarr[2] = { + {0, 0xa3, 0xc, F_SA_LOW | F_D_IN, resp_rsup_opcodes, NULL, + {12, 0xc, 0x87, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, + 0xc7, 0, 0, 0, 0} }, + {0, 0xa3, 0xd, F_SA_LOW | F_D_IN, resp_rsup_tmfs, NULL, + {12, 0xd, 0x80, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0, + 0, 0} }, +}; + +static const struct opcode_info_t write_same_iarr[1] = { + {0, 0x93, 0, F_D_OUT_MAYBE | FF_DIRECT_IO, resp_write_same_16, NULL, + {16, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0x1f, 0xc7} }, +}; + +static const struct opcode_info_t reserve_iarr[1] = { + {0, 0x16, 0, F_D_OUT, NULL, NULL, /* RESERVE(6) */ + {6, 0x1f, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t release_iarr[1] = { + {0, 0x17, 0, F_D_OUT, NULL, NULL, /* RELEASE(6) */ + {6, 0x1f, 0xff, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + + +/* This array is accessed via SDEB_I_* values. Make sure all are mapped, + * plus the terminating elements for logic that scans this table such as + * REPORT SUPPORTED OPERATION CODES. */ +static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEMENT + 1] = { +/* 0 */ + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x12, 0, FF_RESPOND | F_D_IN, resp_inquiry, NULL, + {6, 0xe3, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0xa0, 0, FF_RESPOND | F_D_IN, resp_report_luns, NULL, + {12, 0xe3, 0xff, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0, + 0, 0} }, + {0, 0x3, 0, FF_RESPOND | F_D_IN, resp_requests, NULL, + {6, 0xe1, 0, 0, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x0, 0, F_M_ACCESS | F_RL_WLUN_OK, NULL, NULL,/* TEST UNIT READY */ + {6, 0, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {1, 0x5a, 0, F_D_IN, resp_mode_sense, msense_iarr, + {10, 0xf8, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, + 0} }, + {1, 0x55, 0, F_D_OUT, resp_mode_select, mselect_iarr, + {10, 0xf1, 0, 0, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} }, + {0, 0x4d, 0, F_D_IN, resp_log_sense, NULL, + {10, 0xe3, 0xff, 0xff, 0, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, + 0, 0, 0} }, + {0, 0x25, 0, F_D_IN, resp_readcap, NULL, + {10, 0xe1, 0xff, 0xff, 0xff, 0xff, 0, 0, 0x1, 0xc7, 0, 0, 0, 0, + 0, 0} }, + {3, 0x88, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, read_iarr, + {16, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0x9f, 0xc7} }, /* READ(16) */ +/* 10 */ + {3, 0x8a, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, write_iarr, + {16, 0xfa, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0x9f, 0xc7} }, /* WRITE(16) */ + {0, 0x1b, 0, 0, resp_start_stop, NULL, /* START STOP UNIT */ + {6, 0x1, 0, 0xf, 0xf7, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {1, 0x9e, 0x10, F_SA_LOW | F_D_IN, resp_readcap16, sa_in_iarr, + {16, 0x10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0x1, 0xc7} }, /* READ CAPACITY(16) */ + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* SA OUT */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {2, 0xa3, 0xa, F_SA_LOW | F_D_IN, resp_report_tgtpgs, maint_in_iarr, + {12, 0xea, 0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0, 0, + 0} }, + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* MAINT OUT */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* VERIFY */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {1, 0x7f, 0x9, F_SA_HIGH | F_D_IN | FF_DIRECT_IO, resp_read_dt0, + vl_iarr, {32, 0xc7, 0, 0, 0, 0, 0x1f, 0x18, 0x0, 0x9, 0xfe, 0, + 0xff, 0xff, 0xff, 0xff} },/* VARIABLE LENGTH, READ(32) */ + {1, 0x56, 0, F_D_OUT, NULL, reserve_iarr, /* RESERVE(10) */ + {10, 0xff, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, + 0} }, + {1, 0x57, 0, F_D_OUT, NULL, release_iarr, /* RELEASE(10) */ + {10, 0x13, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, + 0} }, +/* 20 */ + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* ALLOW REMOVAL */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x1, 0, 0, resp_start_stop, NULL, /* REWIND ?? */ + {6, 0x1, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* ATA_PT */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x1d, F_D_OUT, 0, NULL, NULL, /* SEND DIAGNOSTIC */ + {6, 0xf7, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x42, 0, F_D_OUT | FF_DIRECT_IO, resp_unmap, NULL, /* UNMAP */ + {10, 0x1, 0, 0, 0, 0, 0x1f, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} }, + {0, 0x53, 0, F_D_IN | F_D_OUT | FF_DIRECT_IO, resp_xdwriteread_10, + NULL, {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, + 0, 0, 0, 0, 0, 0} }, + {0, 0x3b, 0, F_D_OUT_MAYBE, resp_write_buffer, NULL, + {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, /* WRITE_BUFFER */ + {1, 0x41, 0, F_D_OUT_MAYBE | FF_DIRECT_IO, resp_write_same_10, + write_same_iarr, {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, + 0xff, 0xc7, 0, 0, 0, 0, 0, 0} }, + {0, 0x35, 0, F_DELAY_OVERR | FF_DIRECT_IO, NULL, NULL, /* SYNC_CACHE */ + {10, 0x7, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, + {0, 0x89, 0, F_D_OUT | FF_DIRECT_IO, resp_comp_write, NULL, + {16, 0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, + 0, 0xff, 0x1f, 0xc7} }, /* COMPARE AND WRITE */ + +/* 30 */ + {0xff, 0, 0, 0, NULL, NULL, /* terminating element */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +struct sdebug_scmd_extra_t { + bool inj_recovered; + bool inj_transport; + bool inj_dif; + bool inj_dix; + bool inj_short; +}; + +static int scsi_debug_add_host = DEF_NUM_HOST; +static int scsi_debug_ato = DEF_ATO; +static int scsi_debug_delay = DEF_DELAY; +static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB; +static int scsi_debug_dif = DEF_DIF; +static int scsi_debug_dix = DEF_DIX; +static int scsi_debug_dsense = DEF_D_SENSE; +static int scsi_debug_every_nth = DEF_EVERY_NTH; +static int scsi_debug_fake_rw = DEF_FAKE_RW; +static unsigned int scsi_debug_guard = DEF_GUARD; +static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED; +static int scsi_debug_max_luns = DEF_MAX_LUNS; +static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE; +static atomic_t retired_max_queue; /* if > 0 then was prior max_queue */ +static int scsi_debug_ndelay = DEF_NDELAY; +static int scsi_debug_no_lun_0 = DEF_NO_LUN_0; +static int scsi_debug_no_uld = 0; +static int scsi_debug_num_parts = DEF_NUM_PARTS; +static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */ +static int scsi_debug_opt_blks = DEF_OPT_BLKS; +static int scsi_debug_opts = DEF_OPTS; +static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP; +static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */ +static int scsi_debug_scsi_level = DEF_SCSI_LEVEL; +static int scsi_debug_sector_size = DEF_SECTOR_SIZE; +static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB; +static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO; +static unsigned int scsi_debug_lbpu = DEF_LBPU; +static unsigned int scsi_debug_lbpws = DEF_LBPWS; +static unsigned int scsi_debug_lbpws10 = DEF_LBPWS10; +static unsigned int scsi_debug_lbprz = DEF_LBPRZ; +static unsigned int scsi_debug_unmap_alignment = DEF_UNMAP_ALIGNMENT; +static unsigned int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY; +static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS; +static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC; +static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH; +static bool scsi_debug_removable = DEF_REMOVABLE; +static bool scsi_debug_clustering; +static bool scsi_debug_host_lock = DEF_HOST_LOCK; +static bool scsi_debug_strict = DEF_STRICT; +static bool sdebug_any_injecting_opt; + +static atomic_t sdebug_cmnd_count; +static atomic_t sdebug_completions; +static atomic_t sdebug_a_tsf; /* counter of 'almost' TSFs */ + +#define DEV_READONLY(TGT) (0) + +static unsigned int sdebug_store_sectors; +static sector_t sdebug_capacity; /* in sectors */ + +/* old BIOS stuff, kernel may get rid of them but some mode sense pages + may still need them */ +static int sdebug_heads; /* heads per disk */ +static int sdebug_cylinders_per; /* cylinders per surface */ +static int sdebug_sectors_per; /* sectors per cylinder */ + +#define SDEBUG_MAX_PARTS 4 + +#define SCSI_DEBUG_MAX_CMD_LEN 32 + +static unsigned int scsi_debug_lbp(void) +{ + return ((0 == scsi_debug_fake_rw) && + (scsi_debug_lbpu | scsi_debug_lbpws | scsi_debug_lbpws10)); +} + +struct sdebug_dev_info { + struct list_head dev_list; + unsigned int channel; + unsigned int target; + u64 lun; + struct sdebug_host_info *sdbg_host; + unsigned long uas_bm[1]; + atomic_t num_in_q; + char stopped; /* TODO: should be atomic */ + bool used; +}; + +struct sdebug_host_info { + struct list_head host_list; + struct Scsi_Host *shost; + struct device dev; + struct list_head dev_info_list; +}; + +#define to_sdebug_host(d) \ + container_of(d, struct sdebug_host_info, dev) + +static LIST_HEAD(sdebug_host_list); +static DEFINE_SPINLOCK(sdebug_host_list_lock); + + +struct sdebug_hrtimer { /* ... is derived from hrtimer */ + struct hrtimer hrt; /* must be first element */ + int qa_indx; +}; + +struct sdebug_queued_cmd { + /* in_use flagged by a bit in queued_in_use_bm[] */ + struct timer_list *cmnd_timerp; + struct tasklet_struct *tletp; + struct sdebug_hrtimer *sd_hrtp; + struct scsi_cmnd * a_cmnd; +}; +static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE]; +static unsigned long queued_in_use_bm[SCSI_DEBUG_CANQUEUE_WORDS]; + + +static unsigned char * fake_storep; /* ramdisk storage */ +static struct sd_dif_tuple *dif_storep; /* protection info */ +static void *map_storep; /* provisioning map */ + +static unsigned long map_size; +static int num_aborts; +static int num_dev_resets; +static int num_target_resets; +static int num_bus_resets; +static int num_host_resets; +static int dix_writes; +static int dix_reads; +static int dif_errors; + +static DEFINE_SPINLOCK(queued_arr_lock); +static DEFINE_RWLOCK(atomic_rw); + +static char sdebug_proc_name[] = MY_NAME; +static const char *my_name = MY_NAME; + +static struct bus_type pseudo_lld_bus; + +static struct device_driver sdebug_driverfs_driver = { + .name = sdebug_proc_name, + .bus = &pseudo_lld_bus, +}; + +static const int check_condition_result = + (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; + +static const int illegal_condition_result = + (DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION; + +static const int device_qfull_result = + (DID_OK << 16) | (COMMAND_COMPLETE << 8) | SAM_STAT_TASK_SET_FULL; + +static unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, + 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, + 0, 0, 0, 0}; +static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, + 0, 0, 0x2, 0x4b}; +static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, + 0, 0, 0x0, 0x0}; + +static void *fake_store(unsigned long long lba) +{ + lba = do_div(lba, sdebug_store_sectors); + + return fake_storep + lba * scsi_debug_sector_size; +} + +static struct sd_dif_tuple *dif_store(sector_t sector) +{ + sector = do_div(sector, sdebug_store_sectors); + + return dif_storep + sector; +} + +static int sdebug_add_adapter(void); +static void sdebug_remove_adapter(void); + +static void sdebug_max_tgts_luns(void) +{ + struct sdebug_host_info *sdbg_host; + struct Scsi_Host *hpnt; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { + hpnt = sdbg_host->shost; + if ((hpnt->this_id >= 0) && + (scsi_debug_num_tgts > hpnt->this_id)) + hpnt->max_id = scsi_debug_num_tgts + 1; + else + hpnt->max_id = scsi_debug_num_tgts; + /* scsi_debug_max_luns; */ + hpnt->max_lun = SAM2_WLUN_REPORT_LUNS; + } + spin_unlock(&sdebug_host_list_lock); +} + +enum sdeb_cmd_data {SDEB_IN_DATA = 0, SDEB_IN_CDB = 1}; + +/* Set in_bit to -1 to indicate no bit position of invalid field */ +static void +mk_sense_invalid_fld(struct scsi_cmnd *scp, enum sdeb_cmd_data c_d, + int in_byte, int in_bit) +{ + unsigned char *sbuff; + u8 sks[4]; + int sl, asc; + + sbuff = scp->sense_buffer; + if (!sbuff) { + sdev_printk(KERN_ERR, scp->device, + "%s: sense_buffer is NULL\n", __func__); + return; + } + asc = c_d ? INVALID_FIELD_IN_CDB : INVALID_FIELD_IN_PARAM_LIST; + memset(sbuff, 0, SCSI_SENSE_BUFFERSIZE); + scsi_build_sense_buffer(scsi_debug_dsense, sbuff, ILLEGAL_REQUEST, + asc, 0); + memset(sks, 0, sizeof(sks)); + sks[0] = 0x80; + if (c_d) + sks[0] |= 0x40; + if (in_bit >= 0) { + sks[0] |= 0x8; + sks[0] |= 0x7 & in_bit; + } + put_unaligned_be16(in_byte, sks + 1); + if (scsi_debug_dsense) { + sl = sbuff[7] + 8; + sbuff[7] = sl; + sbuff[sl] = 0x2; + sbuff[sl + 1] = 0x6; + memcpy(sbuff + sl + 4, sks, 3); + } else + memcpy(sbuff + 15, sks, 3); + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, scp->device, "%s: [sense_key,asc,ascq" + "]: [0x5,0x%x,0x0] %c byte=%d, bit=%d\n", + my_name, asc, c_d ? 'C' : 'D', in_byte, in_bit); +} + +static void mk_sense_buffer(struct scsi_cmnd *scp, int key, int asc, int asq) +{ + unsigned char *sbuff; + + sbuff = scp->sense_buffer; + if (!sbuff) { + sdev_printk(KERN_ERR, scp->device, + "%s: sense_buffer is NULL\n", __func__); + return; + } + memset(sbuff, 0, SCSI_SENSE_BUFFERSIZE); + + scsi_build_sense_buffer(scsi_debug_dsense, sbuff, key, asc, asq); + + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, scp->device, + "%s: [sense_key,asc,ascq]: [0x%x,0x%x,0x%x]\n", + my_name, key, asc, asq); +} + +static void +mk_sense_invalid_opcode(struct scsi_cmnd *scp) +{ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_OPCODE, 0); +} + +static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg) +{ + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { + if (0x1261 == cmd) + sdev_printk(KERN_INFO, dev, + "%s: BLKFLSBUF [0x1261]\n", __func__); + else if (0x5331 == cmd) + sdev_printk(KERN_INFO, dev, + "%s: CDROM_GET_CAPABILITY [0x5331]\n", + __func__); + else + sdev_printk(KERN_INFO, dev, "%s: cmd=0x%x\n", + __func__, cmd); + } + return -EINVAL; + /* return -ENOTTY; // correct return but upsets fdisk */ +} + +static void clear_luns_changed_on_target(struct sdebug_dev_info *devip) +{ + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, dev_list) { + if ((devip->sdbg_host == dp->sdbg_host) && + (devip->target == dp->target)) + clear_bit(SDEBUG_UA_LUNS_CHANGED, dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); +} + +static int check_readiness(struct scsi_cmnd *SCpnt, int uas_only, + struct sdebug_dev_info * devip) +{ + int k; + bool debug = !!(SCSI_DEBUG_OPT_NOISE & scsi_debug_opts); + + k = find_first_bit(devip->uas_bm, SDEBUG_NUM_UAS); + if (k != SDEBUG_NUM_UAS) { + const char *cp = NULL; + + switch (k) { + case SDEBUG_UA_POR: + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + UA_RESET_ASC, POWER_ON_RESET_ASCQ); + if (debug) + cp = "power on reset"; + break; + case SDEBUG_UA_BUS_RESET: + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + UA_RESET_ASC, BUS_RESET_ASCQ); + if (debug) + cp = "bus reset"; + break; + case SDEBUG_UA_MODE_CHANGED: + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + UA_CHANGED_ASC, MODE_CHANGED_ASCQ); + if (debug) + cp = "mode parameters changed"; + break; + case SDEBUG_UA_CAPACITY_CHANGED: + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + UA_CHANGED_ASC, CAPACITY_CHANGED_ASCQ); + if (debug) + cp = "capacity data changed"; + break; + case SDEBUG_UA_MICROCODE_CHANGED: + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + TARGET_CHANGED_ASC, MICROCODE_CHANGED_ASCQ); + if (debug) + cp = "microcode has been changed"; + break; + case SDEBUG_UA_MICROCODE_CHANGED_WO_RESET: + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + TARGET_CHANGED_ASC, + MICROCODE_CHANGED_WO_RESET_ASCQ); + if (debug) + cp = "microcode has been changed without reset"; + break; + case SDEBUG_UA_LUNS_CHANGED: + /* + * SPC-3 behavior is to report a UNIT ATTENTION with + * ASC/ASCQ REPORTED LUNS DATA HAS CHANGED on every LUN + * on the target, until a REPORT LUNS command is + * received. SPC-4 behavior is to report it only once. + * NOTE: scsi_debug_scsi_level does not use the same + * values as struct scsi_device->scsi_level. + */ + if (scsi_debug_scsi_level >= 6) /* SPC-4 and above */ + clear_luns_changed_on_target(devip); + mk_sense_buffer(SCpnt, UNIT_ATTENTION, + TARGET_CHANGED_ASC, + LUNS_CHANGED_ASCQ); + if (debug) + cp = "reported luns data has changed"; + break; + default: + pr_warn("%s: unexpected unit attention code=%d\n", + __func__, k); + if (debug) + cp = "unknown"; + break; + } + clear_bit(k, devip->uas_bm); + if (debug) + sdev_printk(KERN_INFO, SCpnt->device, + "%s reports: Unit attention: %s\n", + my_name, cp); + return check_condition_result; + } + if ((UAS_TUR == uas_only) && devip->stopped) { + mk_sense_buffer(SCpnt, NOT_READY, LOGICAL_UNIT_NOT_READY, + 0x2); + if (debug) + sdev_printk(KERN_INFO, SCpnt->device, + "%s reports: Not ready: %s\n", my_name, + "initializing command required"); + return check_condition_result; + } + return 0; +} + +/* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */ +static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr, + int arr_len) +{ + int act_len; + struct scsi_data_buffer *sdb = scsi_in(scp); + + if (!sdb->length) + return 0; + if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE)) + return (DID_ERROR << 16); + + act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents, + arr, arr_len); + sdb->resid = scsi_bufflen(scp) - act_len; + + return 0; +} + +/* Returns number of bytes fetched into 'arr' or -1 if error. */ +static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr, + int arr_len) +{ + if (!scsi_bufflen(scp)) + return 0; + if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE)) + return -1; + + return scsi_sg_copy_to_buffer(scp, arr, arr_len); +} + + +static const char * inq_vendor_id = "Linux "; +static const char * inq_product_id = "scsi_debug "; +static const char *inq_product_rev = "0184"; /* version less '.' */ + +/* Device identification VPD page. Returns number of bytes placed in arr */ +static int inquiry_evpd_83(unsigned char * arr, int port_group_id, + int target_dev_id, int dev_id_num, + const char * dev_id_str, + int dev_id_str_len) +{ + int num, port_a; + char b[32]; + + port_a = target_dev_id + 1; + /* T10 vendor identifier field format (faked) */ + arr[0] = 0x2; /* ASCII */ + arr[1] = 0x1; + arr[2] = 0x0; + memcpy(&arr[4], inq_vendor_id, 8); + memcpy(&arr[12], inq_product_id, 16); + memcpy(&arr[28], dev_id_str, dev_id_str_len); + num = 8 + 16 + dev_id_str_len; + arr[3] = num; + num += 4; + if (dev_id_num >= 0) { + /* NAA-5, Logical unit identifier (binary) */ + arr[num++] = 0x1; /* binary (not necessarily sas) */ + arr[num++] = 0x3; /* PIV=0, lu, naa */ + arr[num++] = 0x0; + arr[num++] = 0x8; + arr[num++] = 0x53; /* naa-5 ieee company id=0x333333 (fake) */ + arr[num++] = 0x33; + arr[num++] = 0x33; + arr[num++] = 0x30; + arr[num++] = (dev_id_num >> 24); + arr[num++] = (dev_id_num >> 16) & 0xff; + arr[num++] = (dev_id_num >> 8) & 0xff; + arr[num++] = dev_id_num & 0xff; + /* Target relative port number */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x94; /* PIV=1, target port, rel port */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x4; /* length */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + arr[num++] = 0x1; /* relative port A */ + } + /* NAA-5, Target port identifier */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x93; /* piv=1, target port, naa */ + arr[num++] = 0x0; + arr[num++] = 0x8; + arr[num++] = 0x52; /* naa-5, company id=0x222222 (fake) */ + arr[num++] = 0x22; + arr[num++] = 0x22; + arr[num++] = 0x20; + arr[num++] = (port_a >> 24); + arr[num++] = (port_a >> 16) & 0xff; + arr[num++] = (port_a >> 8) & 0xff; + arr[num++] = port_a & 0xff; + /* NAA-5, Target port group identifier */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x95; /* piv=1, target port group id */ + arr[num++] = 0x0; + arr[num++] = 0x4; + arr[num++] = 0; + arr[num++] = 0; + arr[num++] = (port_group_id >> 8) & 0xff; + arr[num++] = port_group_id & 0xff; + /* NAA-5, Target device identifier */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0xa3; /* piv=1, target device, naa */ + arr[num++] = 0x0; + arr[num++] = 0x8; + arr[num++] = 0x52; /* naa-5, company id=0x222222 (fake) */ + arr[num++] = 0x22; + arr[num++] = 0x22; + arr[num++] = 0x20; + arr[num++] = (target_dev_id >> 24); + arr[num++] = (target_dev_id >> 16) & 0xff; + arr[num++] = (target_dev_id >> 8) & 0xff; + arr[num++] = target_dev_id & 0xff; + /* SCSI name string: Target device identifier */ + arr[num++] = 0x63; /* proto=sas, UTF-8 */ + arr[num++] = 0xa8; /* piv=1, target device, SCSI name string */ + arr[num++] = 0x0; + arr[num++] = 24; + memcpy(arr + num, "naa.52222220", 12); + num += 12; + snprintf(b, sizeof(b), "%08X", target_dev_id); + memcpy(arr + num, b, 8); + num += 8; + memset(arr + num, 0, 4); + num += 4; + return num; +} + + +static unsigned char vpd84_data[] = { +/* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0, + 0x22,0x22,0x22,0x0,0xbb,0x1, + 0x22,0x22,0x22,0x0,0xbb,0x2, +}; + +/* Software interface identification VPD page */ +static int inquiry_evpd_84(unsigned char * arr) +{ + memcpy(arr, vpd84_data, sizeof(vpd84_data)); + return sizeof(vpd84_data); +} + +/* Management network addresses VPD page */ +static int inquiry_evpd_85(unsigned char * arr) +{ + int num = 0; + const char * na1 = "https://www.kernel.org/config"; + const char * na2 = "http://www.kernel.org/log"; + int plen, olen; + + arr[num++] = 0x1; /* lu, storage config */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + olen = strlen(na1); + plen = olen + 1; + if (plen % 4) + plen = ((plen / 4) + 1) * 4; + arr[num++] = plen; /* length, null termianted, padded */ + memcpy(arr + num, na1, olen); + memset(arr + num + olen, 0, plen - olen); + num += plen; + + arr[num++] = 0x4; /* lu, logging */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + olen = strlen(na2); + plen = olen + 1; + if (plen % 4) + plen = ((plen / 4) + 1) * 4; + arr[num++] = plen; /* length, null terminated, padded */ + memcpy(arr + num, na2, olen); + memset(arr + num + olen, 0, plen - olen); + num += plen; + + return num; +} + +/* SCSI ports VPD page */ +static int inquiry_evpd_88(unsigned char * arr, int target_dev_id) +{ + int num = 0; + int port_a, port_b; + + port_a = target_dev_id + 1; + port_b = port_a + 1; + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + arr[num++] = 0x1; /* relative port 1 (primary) */ + memset(arr + num, 0, 6); + num += 6; + arr[num++] = 0x0; + arr[num++] = 12; /* length tp descriptor */ + /* naa-5 target port identifier (A) */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x93; /* PIV=1, target port, NAA */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x8; /* length */ + arr[num++] = 0x52; /* NAA-5, company_id=0x222222 (fake) */ + arr[num++] = 0x22; + arr[num++] = 0x22; + arr[num++] = 0x20; + arr[num++] = (port_a >> 24); + arr[num++] = (port_a >> 16) & 0xff; + arr[num++] = (port_a >> 8) & 0xff; + arr[num++] = port_a & 0xff; + + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + arr[num++] = 0x2; /* relative port 2 (secondary) */ + memset(arr + num, 0, 6); + num += 6; + arr[num++] = 0x0; + arr[num++] = 12; /* length tp descriptor */ + /* naa-5 target port identifier (B) */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x93; /* PIV=1, target port, NAA */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x8; /* length */ + arr[num++] = 0x52; /* NAA-5, company_id=0x222222 (fake) */ + arr[num++] = 0x22; + arr[num++] = 0x22; + arr[num++] = 0x20; + arr[num++] = (port_b >> 24); + arr[num++] = (port_b >> 16) & 0xff; + arr[num++] = (port_b >> 8) & 0xff; + arr[num++] = port_b & 0xff; + + return num; +} + + +static unsigned char vpd89_data[] = { +/* from 4th byte */ 0,0,0,0, +'l','i','n','u','x',' ',' ',' ', +'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ', +'1','2','3','4', +0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, +0xec,0,0,0, +0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0, +0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20, +0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33, +0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31, +0x53,0x41, +0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, +0x20,0x20, +0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, +0x10,0x80, +0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0, +0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0, +0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0, +0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40, +0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0, +0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42, +0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8, +0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe, +0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51, +}; + +/* ATA Information VPD page */ +static int inquiry_evpd_89(unsigned char * arr) +{ + memcpy(arr, vpd89_data, sizeof(vpd89_data)); + return sizeof(vpd89_data); +} + + +static unsigned char vpdb0_data[] = { + /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +}; + +/* Block limits VPD page (SBC-3) */ +static int inquiry_evpd_b0(unsigned char * arr) +{ + unsigned int gran; + + memcpy(arr, vpdb0_data, sizeof(vpdb0_data)); + + /* Optimal transfer length granularity */ + gran = 1 << scsi_debug_physblk_exp; + arr[2] = (gran >> 8) & 0xff; + arr[3] = gran & 0xff; + + /* Maximum Transfer Length */ + if (sdebug_store_sectors > 0x400) { + arr[4] = (sdebug_store_sectors >> 24) & 0xff; + arr[5] = (sdebug_store_sectors >> 16) & 0xff; + arr[6] = (sdebug_store_sectors >> 8) & 0xff; + arr[7] = sdebug_store_sectors & 0xff; + } + + /* Optimal Transfer Length */ + put_unaligned_be32(scsi_debug_opt_blks, &arr[8]); + + if (scsi_debug_lbpu) { + /* Maximum Unmap LBA Count */ + put_unaligned_be32(scsi_debug_unmap_max_blocks, &arr[16]); + + /* Maximum Unmap Block Descriptor Count */ + put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]); + } + + /* Unmap Granularity Alignment */ + if (scsi_debug_unmap_alignment) { + put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]); + arr[28] |= 0x80; /* UGAVALID */ + } + + /* Optimal Unmap Granularity */ + put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]); + + /* Maximum WRITE SAME Length */ + put_unaligned_be64(scsi_debug_write_same_length, &arr[32]); + + return 0x3c; /* Mandatory page length for Logical Block Provisioning */ + + return sizeof(vpdb0_data); +} + +/* Block device characteristics VPD page (SBC-3) */ +static int inquiry_evpd_b1(unsigned char *arr) +{ + memset(arr, 0, 0x3c); + arr[0] = 0; + arr[1] = 1; /* non rotating medium (e.g. solid state) */ + arr[2] = 0; + arr[3] = 5; /* less than 1.8" */ + + return 0x3c; +} + +/* Logical block provisioning VPD page (SBC-3) */ +static int inquiry_evpd_b2(unsigned char *arr) +{ + memset(arr, 0, 0x4); + arr[0] = 0; /* threshold exponent */ + + if (scsi_debug_lbpu) + arr[1] = 1 << 7; + + if (scsi_debug_lbpws) + arr[1] |= 1 << 6; + + if (scsi_debug_lbpws10) + arr[1] |= 1 << 5; + + if (scsi_debug_lbprz) + arr[1] |= 1 << 2; + + return 0x4; +} + +#define SDEBUG_LONG_INQ_SZ 96 +#define SDEBUG_MAX_INQ_ARR_SZ 584 + +static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + unsigned char pq_pdt; + unsigned char * arr; + unsigned char *cmd = scp->cmnd; + int alloc_len, n, ret; + bool have_wlun; + + alloc_len = (cmd[3] << 8) + cmd[4]; + arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC); + if (! arr) + return DID_REQUEUE << 16; + have_wlun = (scp->device->lun == SAM2_WLUN_REPORT_LUNS); + if (have_wlun) + pq_pdt = 0x1e; /* present, wlun */ + else if (scsi_debug_no_lun_0 && (0 == devip->lun)) + pq_pdt = 0x7f; /* not present, no device type */ + else + pq_pdt = (scsi_debug_ptype & 0x1f); + arr[0] = pq_pdt; + if (0x2 & cmd[1]) { /* CMDDT bit set */ + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 1); + kfree(arr); + return check_condition_result; + } else if (0x1 & cmd[1]) { /* EVPD bit set */ + int lu_id_num, port_group_id, target_dev_id, len; + char lu_id_str[6]; + int host_no = devip->sdbg_host->shost->host_no; + + port_group_id = (((host_no + 1) & 0x7f) << 8) + + (devip->channel & 0x7f); + if (0 == scsi_debug_vpd_use_hostno) + host_no = 0; + lu_id_num = have_wlun ? -1 : (((host_no + 1) * 2000) + + (devip->target * 1000) + devip->lun); + target_dev_id = ((host_no + 1) * 2000) + + (devip->target * 1000) - 3; + len = scnprintf(lu_id_str, 6, "%d", lu_id_num); + if (0 == cmd[2]) { /* supported vital product data pages */ + arr[1] = cmd[2]; /*sanity */ + n = 4; + arr[n++] = 0x0; /* this page */ + arr[n++] = 0x80; /* unit serial number */ + arr[n++] = 0x83; /* device identification */ + arr[n++] = 0x84; /* software interface ident. */ + arr[n++] = 0x85; /* management network addresses */ + arr[n++] = 0x86; /* extended inquiry */ + arr[n++] = 0x87; /* mode page policy */ + arr[n++] = 0x88; /* SCSI ports */ + arr[n++] = 0x89; /* ATA information */ + arr[n++] = 0xb0; /* Block limits (SBC) */ + arr[n++] = 0xb1; /* Block characteristics (SBC) */ + if (scsi_debug_lbp()) /* Logical Block Prov. (SBC) */ + arr[n++] = 0xb2; + arr[3] = n - 4; /* number of supported VPD pages */ + } else if (0x80 == cmd[2]) { /* unit serial number */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = len; + memcpy(&arr[4], lu_id_str, len); + } else if (0x83 == cmd[2]) { /* device identification */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_83(&arr[4], port_group_id, + target_dev_id, lu_id_num, + lu_id_str, len); + } else if (0x84 == cmd[2]) { /* Software interface ident. */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_84(&arr[4]); + } else if (0x85 == cmd[2]) { /* Management network addresses */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_85(&arr[4]); + } else if (0x86 == cmd[2]) { /* extended inquiry */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = 0x3c; /* number of following entries */ + if (scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) + arr[4] = 0x4; /* SPT: GRD_CHK:1 */ + else if (scsi_debug_dif) + arr[4] = 0x5; /* SPT: GRD_CHK:1, REF_CHK:1 */ + else + arr[4] = 0x0; /* no protection stuff */ + arr[5] = 0x7; /* head of q, ordered + simple q's */ + } else if (0x87 == cmd[2]) { /* mode page policy */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = 0x8; /* number of following entries */ + arr[4] = 0x2; /* disconnect-reconnect mp */ + arr[6] = 0x80; /* mlus, shared */ + arr[8] = 0x18; /* protocol specific lu */ + arr[10] = 0x82; /* mlus, per initiator port */ + } else if (0x88 == cmd[2]) { /* SCSI Ports */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_88(&arr[4], target_dev_id); + } else if (0x89 == cmd[2]) { /* ATA information */ + arr[1] = cmd[2]; /*sanity */ + n = inquiry_evpd_89(&arr[4]); + arr[2] = (n >> 8); + arr[3] = (n & 0xff); + } else if (0xb0 == cmd[2]) { /* Block limits (SBC) */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_b0(&arr[4]); + } else if (0xb1 == cmd[2]) { /* Block characteristics (SBC) */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_b1(&arr[4]); + } else if (0xb2 == cmd[2]) { /* Logical Block Prov. (SBC) */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_evpd_b2(&arr[4]); + } else { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1); + kfree(arr); + return check_condition_result; + } + len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len); + ret = fill_from_dev_buffer(scp, arr, + min(len, SDEBUG_MAX_INQ_ARR_SZ)); + kfree(arr); + return ret; + } + /* drops through here for a standard inquiry */ + arr[1] = scsi_debug_removable ? 0x80 : 0; /* Removable disk */ + arr[2] = scsi_debug_scsi_level; + arr[3] = 2; /* response_data_format==2 */ + arr[4] = SDEBUG_LONG_INQ_SZ - 5; + arr[5] = scsi_debug_dif ? 1 : 0; /* PROTECT bit */ + if (0 == scsi_debug_vpd_use_hostno) + arr[5] = 0x10; /* claim: implicit TGPS */ + arr[6] = 0x10; /* claim: MultiP */ + /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */ + arr[7] = 0xa; /* claim: LINKED + CMDQUE */ + memcpy(&arr[8], inq_vendor_id, 8); + memcpy(&arr[16], inq_product_id, 16); + memcpy(&arr[32], inq_product_rev, 4); + /* version descriptors (2 bytes each) follow */ + arr[58] = 0x0; arr[59] = 0xa2; /* SAM-5 rev 4 */ + arr[60] = 0x4; arr[61] = 0x68; /* SPC-4 rev 37 */ + n = 62; + if (scsi_debug_ptype == 0) { + arr[n++] = 0x4; arr[n++] = 0xc5; /* SBC-4 rev 36 */ + } else if (scsi_debug_ptype == 1) { + arr[n++] = 0x5; arr[n++] = 0x25; /* SSC-4 rev 3 */ + } + arr[n++] = 0x20; arr[n++] = 0xe6; /* SPL-3 rev 7 */ + ret = fill_from_dev_buffer(scp, arr, + min(alloc_len, SDEBUG_LONG_INQ_SZ)); + kfree(arr); + return ret; +} + +static int resp_requests(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + unsigned char * sbuff; + unsigned char *cmd = scp->cmnd; + unsigned char arr[SCSI_SENSE_BUFFERSIZE]; + bool dsense, want_dsense; + int len = 18; + + memset(arr, 0, sizeof(arr)); + dsense = !!(cmd[1] & 1); + want_dsense = dsense || scsi_debug_dsense; + sbuff = scp->sense_buffer; + if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) { + if (dsense) { + arr[0] = 0x72; + arr[1] = 0x0; /* NO_SENSE in sense_key */ + arr[2] = THRESHOLD_EXCEEDED; + arr[3] = 0xff; /* TEST set and MRIE==6 */ + len = 8; + } else { + arr[0] = 0x70; + arr[2] = 0x0; /* NO_SENSE in sense_key */ + arr[7] = 0xa; /* 18 byte sense buffer */ + arr[12] = THRESHOLD_EXCEEDED; + arr[13] = 0xff; /* TEST set and MRIE==6 */ + } + } else { + memcpy(arr, sbuff, SCSI_SENSE_BUFFERSIZE); + if (arr[0] >= 0x70 && dsense == scsi_debug_dsense) + ; /* have sense and formats match */ + else if (arr[0] <= 0x70) { + if (dsense) { + memset(arr, 0, 8); + arr[0] = 0x72; + len = 8; + } else { + memset(arr, 0, 18); + arr[0] = 0x70; + arr[7] = 0xa; + } + } else if (dsense) { + memset(arr, 0, 8); + arr[0] = 0x72; + arr[1] = sbuff[2]; /* sense key */ + arr[2] = sbuff[12]; /* asc */ + arr[3] = sbuff[13]; /* ascq */ + len = 8; + } else { + memset(arr, 0, 18); + arr[0] = 0x70; + arr[2] = sbuff[1]; + arr[7] = 0xa; + arr[12] = sbuff[1]; + arr[13] = sbuff[3]; + } + + } + mk_sense_buffer(scp, 0, NO_ADDITIONAL_SENSE, 0); + return fill_from_dev_buffer(scp, arr, len); +} + +static int resp_start_stop(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + unsigned char *cmd = scp->cmnd; + int power_cond, start; + + power_cond = (cmd[4] & 0xf0) >> 4; + if (power_cond) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 4, 7); + return check_condition_result; + } + start = cmd[4] & 1; + if (start == devip->stopped) + devip->stopped = !start; + return 0; +} + +static sector_t get_sdebug_capacity(void) +{ + if (scsi_debug_virtual_gb > 0) + return (sector_t)scsi_debug_virtual_gb * + (1073741824 / scsi_debug_sector_size); + else + return sdebug_store_sectors; +} + +#define SDEBUG_READCAP_ARR_SZ 8 +static int resp_readcap(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + unsigned char arr[SDEBUG_READCAP_ARR_SZ]; + unsigned int capac; + + /* following just in case virtual_gb changed */ + sdebug_capacity = get_sdebug_capacity(); + memset(arr, 0, SDEBUG_READCAP_ARR_SZ); + if (sdebug_capacity < 0xffffffff) { + capac = (unsigned int)sdebug_capacity - 1; + arr[0] = (capac >> 24); + arr[1] = (capac >> 16) & 0xff; + arr[2] = (capac >> 8) & 0xff; + arr[3] = capac & 0xff; + } else { + arr[0] = 0xff; + arr[1] = 0xff; + arr[2] = 0xff; + arr[3] = 0xff; + } + arr[6] = (scsi_debug_sector_size >> 8) & 0xff; + arr[7] = scsi_debug_sector_size & 0xff; + return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ); +} + +#define SDEBUG_READCAP16_ARR_SZ 32 +static int resp_readcap16(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + unsigned char *cmd = scp->cmnd; + unsigned char arr[SDEBUG_READCAP16_ARR_SZ]; + unsigned long long capac; + int k, alloc_len; + + alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8) + + cmd[13]); + /* following just in case virtual_gb changed */ + sdebug_capacity = get_sdebug_capacity(); + memset(arr, 0, SDEBUG_READCAP16_ARR_SZ); + capac = sdebug_capacity - 1; + for (k = 0; k < 8; ++k, capac >>= 8) + arr[7 - k] = capac & 0xff; + arr[8] = (scsi_debug_sector_size >> 24) & 0xff; + arr[9] = (scsi_debug_sector_size >> 16) & 0xff; + arr[10] = (scsi_debug_sector_size >> 8) & 0xff; + arr[11] = scsi_debug_sector_size & 0xff; + arr[13] = scsi_debug_physblk_exp & 0xf; + arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f; + + if (scsi_debug_lbp()) { + arr[14] |= 0x80; /* LBPME */ + if (scsi_debug_lbprz) + arr[14] |= 0x40; /* LBPRZ */ + } + + arr[15] = scsi_debug_lowest_aligned & 0xff; + + if (scsi_debug_dif) { + arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */ + arr[12] |= 1; /* PROT_EN */ + } + + return fill_from_dev_buffer(scp, arr, + min(alloc_len, SDEBUG_READCAP16_ARR_SZ)); +} + +#define SDEBUG_MAX_TGTPGS_ARR_SZ 1412 + +static int resp_report_tgtpgs(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + unsigned char *cmd = scp->cmnd; + unsigned char * arr; + int host_no = devip->sdbg_host->shost->host_no; + int n, ret, alen, rlen; + int port_group_a, port_group_b, port_a, port_b; + + alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8) + + cmd[9]); + + arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC); + if (! arr) + return DID_REQUEUE << 16; + /* + * EVPD page 0x88 states we have two ports, one + * real and a fake port with no device connected. + * So we create two port groups with one port each + * and set the group with port B to unavailable. + */ + port_a = 0x1; /* relative port A */ + port_b = 0x2; /* relative port B */ + port_group_a = (((host_no + 1) & 0x7f) << 8) + + (devip->channel & 0x7f); + port_group_b = (((host_no + 1) & 0x7f) << 8) + + (devip->channel & 0x7f) + 0x80; + + /* + * The asymmetric access state is cycled according to the host_id. + */ + n = 4; + if (0 == scsi_debug_vpd_use_hostno) { + arr[n++] = host_no % 3; /* Asymm access state */ + arr[n++] = 0x0F; /* claim: all states are supported */ + } else { + arr[n++] = 0x0; /* Active/Optimized path */ + arr[n++] = 0x01; /* claim: only support active/optimized paths */ + } + arr[n++] = (port_group_a >> 8) & 0xff; + arr[n++] = port_group_a & 0xff; + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Status code */ + arr[n++] = 0; /* Vendor unique */ + arr[n++] = 0x1; /* One port per group */ + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Reserved */ + arr[n++] = (port_a >> 8) & 0xff; + arr[n++] = port_a & 0xff; + arr[n++] = 3; /* Port unavailable */ + arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */ + arr[n++] = (port_group_b >> 8) & 0xff; + arr[n++] = port_group_b & 0xff; + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Status code */ + arr[n++] = 0; /* Vendor unique */ + arr[n++] = 0x1; /* One port per group */ + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Reserved */ + arr[n++] = (port_b >> 8) & 0xff; + arr[n++] = port_b & 0xff; + + rlen = n - 4; + arr[0] = (rlen >> 24) & 0xff; + arr[1] = (rlen >> 16) & 0xff; + arr[2] = (rlen >> 8) & 0xff; + arr[3] = rlen & 0xff; + + /* + * Return the smallest value of either + * - The allocated length + * - The constructed command length + * - The maximum array size + */ + rlen = min(alen,n); + ret = fill_from_dev_buffer(scp, arr, + min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ)); + kfree(arr); + return ret; +} + +static int +resp_rsup_opcodes(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + bool rctd; + u8 reporting_opts, req_opcode, sdeb_i, supp; + u16 req_sa, u; + u32 alloc_len, a_len; + int k, offset, len, errsts, count, bump, na; + const struct opcode_info_t *oip; + const struct opcode_info_t *r_oip; + u8 *arr; + u8 *cmd = scp->cmnd; + + rctd = !!(cmd[2] & 0x80); + reporting_opts = cmd[2] & 0x7; + req_opcode = cmd[3]; + req_sa = get_unaligned_be16(cmd + 4); + alloc_len = get_unaligned_be32(cmd + 6); + if (alloc_len < 4 || alloc_len > 0xffff) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1); + return check_condition_result; + } + if (alloc_len > 8192) + a_len = 8192; + else + a_len = alloc_len; + arr = kzalloc((a_len < 256) ? 320 : a_len + 64, GFP_ATOMIC); + if (NULL == arr) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + switch (reporting_opts) { + case 0: /* all commands */ + /* count number of commands */ + for (count = 0, oip = opcode_info_arr; + oip->num_attached != 0xff; ++oip) { + if (F_INV_OP & oip->flags) + continue; + count += (oip->num_attached + 1); + } + bump = rctd ? 20 : 8; + put_unaligned_be32(count * bump, arr); + for (offset = 4, oip = opcode_info_arr; + oip->num_attached != 0xff && offset < a_len; ++oip) { + if (F_INV_OP & oip->flags) + continue; + na = oip->num_attached; + arr[offset] = oip->opcode; + put_unaligned_be16(oip->sa, arr + offset + 2); + if (rctd) + arr[offset + 5] |= 0x2; + if (FF_SA & oip->flags) + arr[offset + 5] |= 0x1; + put_unaligned_be16(oip->len_mask[0], arr + offset + 6); + if (rctd) + put_unaligned_be16(0xa, arr + offset + 8); + r_oip = oip; + for (k = 0, oip = oip->arrp; k < na; ++k, ++oip) { + if (F_INV_OP & oip->flags) + continue; + offset += bump; + arr[offset] = oip->opcode; + put_unaligned_be16(oip->sa, arr + offset + 2); + if (rctd) + arr[offset + 5] |= 0x2; + if (FF_SA & oip->flags) + arr[offset + 5] |= 0x1; + put_unaligned_be16(oip->len_mask[0], + arr + offset + 6); + if (rctd) + put_unaligned_be16(0xa, + arr + offset + 8); + } + oip = r_oip; + offset += bump; + } + break; + case 1: /* one command: opcode only */ + case 2: /* one command: opcode plus service action */ + case 3: /* one command: if sa==0 then opcode only else opcode+sa */ + sdeb_i = opcode_ind_arr[req_opcode]; + oip = &opcode_info_arr[sdeb_i]; + if (F_INV_OP & oip->flags) { + supp = 1; + offset = 4; + } else { + if (1 == reporting_opts) { + if (FF_SA & oip->flags) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, + 2, 2); + kfree(arr); + return check_condition_result; + } + req_sa = 0; + } else if (2 == reporting_opts && + 0 == (FF_SA & oip->flags)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 4, -1); + kfree(arr); /* point at requested sa */ + return check_condition_result; + } + if (0 == (FF_SA & oip->flags) && + req_opcode == oip->opcode) + supp = 3; + else if (0 == (FF_SA & oip->flags)) { + na = oip->num_attached; + for (k = 0, oip = oip->arrp; k < na; + ++k, ++oip) { + if (req_opcode == oip->opcode) + break; + } + supp = (k >= na) ? 1 : 3; + } else if (req_sa != oip->sa) { + na = oip->num_attached; + for (k = 0, oip = oip->arrp; k < na; + ++k, ++oip) { + if (req_sa == oip->sa) + break; + } + supp = (k >= na) ? 1 : 3; + } else + supp = 3; + if (3 == supp) { + u = oip->len_mask[0]; + put_unaligned_be16(u, arr + 2); + arr[4] = oip->opcode; + for (k = 1; k < u; ++k) + arr[4 + k] = (k < 16) ? + oip->len_mask[k] : 0xff; + offset = 4 + u; + } else + offset = 4; + } + arr[1] = (rctd ? 0x80 : 0) | supp; + if (rctd) { + put_unaligned_be16(0xa, arr + offset); + offset += 12; + } + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 2); + kfree(arr); + return check_condition_result; + } + offset = (offset < a_len) ? offset : a_len; + len = (offset < alloc_len) ? offset : alloc_len; + errsts = fill_from_dev_buffer(scp, arr, len); + kfree(arr); + return errsts; +} + +static int +resp_rsup_tmfs(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + bool repd; + u32 alloc_len, len; + u8 arr[16]; + u8 *cmd = scp->cmnd; + + memset(arr, 0, sizeof(arr)); + repd = !!(cmd[2] & 0x80); + alloc_len = get_unaligned_be32(cmd + 6); + if (alloc_len < 4) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1); + return check_condition_result; + } + arr[0] = 0xc8; /* ATS | ATSS | LURS */ + arr[1] = 0x1; /* ITNRS */ + if (repd) { + arr[3] = 0xc; + len = 16; + } else + len = 4; + + len = (len < alloc_len) ? len : alloc_len; + return fill_from_dev_buffer(scp, arr, len); +} + +/* <<Following mode page info copied from ST318451LW>> */ + +static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target) +{ /* Read-Write Error Recovery page for mode_sense */ + unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0, + 5, 0, 0xff, 0xff}; + + memcpy(p, err_recov_pg, sizeof(err_recov_pg)); + if (1 == pcontrol) + memset(p + 2, 0, sizeof(err_recov_pg) - 2); + return sizeof(err_recov_pg); +} + +static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target) +{ /* Disconnect-Reconnect page for mode_sense */ + unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0}; + + memcpy(p, disconnect_pg, sizeof(disconnect_pg)); + if (1 == pcontrol) + memset(p + 2, 0, sizeof(disconnect_pg) - 2); + return sizeof(disconnect_pg); +} + +static int resp_format_pg(unsigned char * p, int pcontrol, int target) +{ /* Format device page for mode_sense */ + unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0x40, 0, 0, 0}; + + memcpy(p, format_pg, sizeof(format_pg)); + p[10] = (sdebug_sectors_per >> 8) & 0xff; + p[11] = sdebug_sectors_per & 0xff; + p[12] = (scsi_debug_sector_size >> 8) & 0xff; + p[13] = scsi_debug_sector_size & 0xff; + if (scsi_debug_removable) + p[20] |= 0x20; /* should agree with INQUIRY */ + if (1 == pcontrol) + memset(p + 2, 0, sizeof(format_pg) - 2); + return sizeof(format_pg); +} + +static int resp_caching_pg(unsigned char * p, int pcontrol, int target) +{ /* Caching page for mode_sense */ + unsigned char ch_caching_pg[] = {/* 0x8, 18, */ 0x4, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; + unsigned char d_caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, + 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, 0, 0, 0, 0}; + + if (SCSI_DEBUG_OPT_N_WCE & scsi_debug_opts) + caching_pg[2] &= ~0x4; /* set WCE=0 (default WCE=1) */ + memcpy(p, caching_pg, sizeof(caching_pg)); + if (1 == pcontrol) + memcpy(p + 2, ch_caching_pg, sizeof(ch_caching_pg)); + else if (2 == pcontrol) + memcpy(p, d_caching_pg, sizeof(d_caching_pg)); + return sizeof(caching_pg); +} + +static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target) +{ /* Control mode page for mode_sense */ + unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0, + 0, 0, 0, 0}; + unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, + 0, 0, 0x2, 0x4b}; + + if (scsi_debug_dsense) + ctrl_m_pg[2] |= 0x4; + else + ctrl_m_pg[2] &= ~0x4; + + if (scsi_debug_ato) + ctrl_m_pg[5] |= 0x80; /* ATO=1 */ + + memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg)); + if (1 == pcontrol) + memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg)); + else if (2 == pcontrol) + memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg)); + return sizeof(ctrl_m_pg); +} + + +static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target) +{ /* Informational Exceptions control mode page for mode_sense */ + unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0, + 0, 0, 0x0, 0x0}; + unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, + 0, 0, 0x0, 0x0}; + + memcpy(p, iec_m_pg, sizeof(iec_m_pg)); + if (1 == pcontrol) + memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg)); + else if (2 == pcontrol) + memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg)); + return sizeof(iec_m_pg); +} + +static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target) +{ /* SAS SSP mode page - short format for mode_sense */ + unsigned char sas_sf_m_pg[] = {0x19, 0x6, + 0x6, 0x0, 0x7, 0xd0, 0x0, 0x0}; + + memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg)); + if (1 == pcontrol) + memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2); + return sizeof(sas_sf_m_pg); +} + + +static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target, + int target_dev_id) +{ /* SAS phy control and discover mode page for mode_sense */ + unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2, + 0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0, + 0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0, + 0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1, + 0x2, 0, 0, 0, 0, 0, 0, 0, + 0x88, 0x99, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0, + 0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0, + 0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1, + 0x3, 0, 0, 0, 0, 0, 0, 0, + 0x88, 0x99, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }; + int port_a, port_b; + + port_a = target_dev_id + 1; + port_b = port_a + 1; + memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg)); + p[20] = (port_a >> 24); + p[21] = (port_a >> 16) & 0xff; + p[22] = (port_a >> 8) & 0xff; + p[23] = port_a & 0xff; + p[48 + 20] = (port_b >> 24); + p[48 + 21] = (port_b >> 16) & 0xff; + p[48 + 22] = (port_b >> 8) & 0xff; + p[48 + 23] = port_b & 0xff; + if (1 == pcontrol) + memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4); + return sizeof(sas_pcd_m_pg); +} + +static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol) +{ /* SAS SSP shared protocol specific port mode subpage */ + unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }; + + memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg)); + if (1 == pcontrol) + memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4); + return sizeof(sas_sha_m_pg); +} + +#define SDEBUG_MAX_MSENSE_SZ 256 + +static int +resp_mode_sense(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + unsigned char dbd, llbaa; + int pcontrol, pcode, subpcode, bd_len; + unsigned char dev_spec; + int k, alloc_len, msense_6, offset, len, target_dev_id; + int target = scp->device->id; + unsigned char * ap; + unsigned char arr[SDEBUG_MAX_MSENSE_SZ]; + unsigned char *cmd = scp->cmnd; + + dbd = !!(cmd[1] & 0x8); + pcontrol = (cmd[2] & 0xc0) >> 6; + pcode = cmd[2] & 0x3f; + subpcode = cmd[3]; + msense_6 = (MODE_SENSE == cmd[0]); + llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10); + if ((0 == scsi_debug_ptype) && (0 == dbd)) + bd_len = llbaa ? 16 : 8; + else + bd_len = 0; + alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]); + memset(arr, 0, SDEBUG_MAX_MSENSE_SZ); + if (0x3 == pcontrol) { /* Saving values not supported */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 0); + return check_condition_result; + } + target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) + + (devip->target * 1000) - 3; + /* set DPOFUA bit for disks */ + if (0 == scsi_debug_ptype) + dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10; + else + dev_spec = 0x0; + if (msense_6) { + arr[2] = dev_spec; + arr[3] = bd_len; + offset = 4; + } else { + arr[3] = dev_spec; + if (16 == bd_len) + arr[4] = 0x1; /* set LONGLBA bit */ + arr[7] = bd_len; /* assume 255 or less */ + offset = 8; + } + ap = arr + offset; + if ((bd_len > 0) && (!sdebug_capacity)) + sdebug_capacity = get_sdebug_capacity(); + + if (8 == bd_len) { + if (sdebug_capacity > 0xfffffffe) { + ap[0] = 0xff; + ap[1] = 0xff; + ap[2] = 0xff; + ap[3] = 0xff; + } else { + ap[0] = (sdebug_capacity >> 24) & 0xff; + ap[1] = (sdebug_capacity >> 16) & 0xff; + ap[2] = (sdebug_capacity >> 8) & 0xff; + ap[3] = sdebug_capacity & 0xff; + } + ap[6] = (scsi_debug_sector_size >> 8) & 0xff; + ap[7] = scsi_debug_sector_size & 0xff; + offset += bd_len; + ap = arr + offset; + } else if (16 == bd_len) { + unsigned long long capac = sdebug_capacity; + + for (k = 0; k < 8; ++k, capac >>= 8) + ap[7 - k] = capac & 0xff; + ap[12] = (scsi_debug_sector_size >> 24) & 0xff; + ap[13] = (scsi_debug_sector_size >> 16) & 0xff; + ap[14] = (scsi_debug_sector_size >> 8) & 0xff; + ap[15] = scsi_debug_sector_size & 0xff; + offset += bd_len; + ap = arr + offset; + } + + if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) { + /* TODO: Control Extension page */ + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + switch (pcode) { + case 0x1: /* Read-Write error recovery page, direct access */ + len = resp_err_recov_pg(ap, pcontrol, target); + offset += len; + break; + case 0x2: /* Disconnect-Reconnect page, all devices */ + len = resp_disconnect_pg(ap, pcontrol, target); + offset += len; + break; + case 0x3: /* Format device page, direct access */ + len = resp_format_pg(ap, pcontrol, target); + offset += len; + break; + case 0x8: /* Caching page, direct access */ + len = resp_caching_pg(ap, pcontrol, target); + offset += len; + break; + case 0xa: /* Control Mode page, all devices */ + len = resp_ctrl_m_pg(ap, pcontrol, target); + offset += len; + break; + case 0x19: /* if spc==1 then sas phy, control+discover */ + if ((subpcode > 0x2) && (subpcode < 0xff)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + len = 0; + if ((0x0 == subpcode) || (0xff == subpcode)) + len += resp_sas_sf_m_pg(ap + len, pcontrol, target); + if ((0x1 == subpcode) || (0xff == subpcode)) + len += resp_sas_pcd_m_spg(ap + len, pcontrol, target, + target_dev_id); + if ((0x2 == subpcode) || (0xff == subpcode)) + len += resp_sas_sha_m_spg(ap + len, pcontrol); + offset += len; + break; + case 0x1c: /* Informational Exceptions Mode page, all devices */ + len = resp_iec_m_pg(ap, pcontrol, target); + offset += len; + break; + case 0x3f: /* Read all Mode pages */ + if ((0 == subpcode) || (0xff == subpcode)) { + len = resp_err_recov_pg(ap, pcontrol, target); + len += resp_disconnect_pg(ap + len, pcontrol, target); + len += resp_format_pg(ap + len, pcontrol, target); + len += resp_caching_pg(ap + len, pcontrol, target); + len += resp_ctrl_m_pg(ap + len, pcontrol, target); + len += resp_sas_sf_m_pg(ap + len, pcontrol, target); + if (0xff == subpcode) { + len += resp_sas_pcd_m_spg(ap + len, pcontrol, + target, target_dev_id); + len += resp_sas_sha_m_spg(ap + len, pcontrol); + } + len += resp_iec_m_pg(ap + len, pcontrol, target); + } else { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + offset += len; + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5); + return check_condition_result; + } + if (msense_6) + arr[0] = offset - 1; + else { + arr[0] = ((offset - 2) >> 8) & 0xff; + arr[1] = (offset - 2) & 0xff; + } + return fill_from_dev_buffer(scp, arr, min(alloc_len, offset)); +} + +#define SDEBUG_MAX_MSELECT_SZ 512 + +static int +resp_mode_select(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + int pf, sp, ps, md_len, bd_len, off, spf, pg_len; + int param_len, res, mpage; + unsigned char arr[SDEBUG_MAX_MSELECT_SZ]; + unsigned char *cmd = scp->cmnd; + int mselect6 = (MODE_SELECT == cmd[0]); + + memset(arr, 0, sizeof(arr)); + pf = cmd[1] & 0x10; + sp = cmd[1] & 0x1; + param_len = mselect6 ? cmd[4] : ((cmd[7] << 8) + cmd[8]); + if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, mselect6 ? 4 : 7, -1); + return check_condition_result; + } + res = fetch_to_dev_buffer(scp, arr, param_len); + if (-1 == res) + return (DID_ERROR << 16); + else if ((res < param_len) && + (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, scp->device, + "%s: cdb indicated=%d, IO sent=%d bytes\n", + __func__, param_len, res); + md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2); + bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]); + if (md_len > 2) { + mk_sense_invalid_fld(scp, SDEB_IN_DATA, 0, -1); + return check_condition_result; + } + off = bd_len + (mselect6 ? 4 : 8); + mpage = arr[off] & 0x3f; + ps = !!(arr[off] & 0x80); + if (ps) { + mk_sense_invalid_fld(scp, SDEB_IN_DATA, off, 7); + return check_condition_result; + } + spf = !!(arr[off] & 0x40); + pg_len = spf ? ((arr[off + 2] << 8) + arr[off + 3] + 4) : + (arr[off + 1] + 2); + if ((pg_len + off) > param_len) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, + PARAMETER_LIST_LENGTH_ERR, 0); + return check_condition_result; + } + switch (mpage) { + case 0x8: /* Caching Mode page */ + if (caching_pg[1] == arr[off + 1]) { + memcpy(caching_pg + 2, arr + off + 2, + sizeof(caching_pg) - 2); + goto set_mode_changed_ua; + } + break; + case 0xa: /* Control Mode page */ + if (ctrl_m_pg[1] == arr[off + 1]) { + memcpy(ctrl_m_pg + 2, arr + off + 2, + sizeof(ctrl_m_pg) - 2); + scsi_debug_dsense = !!(ctrl_m_pg[2] & 0x4); + goto set_mode_changed_ua; + } + break; + case 0x1c: /* Informational Exceptions Mode page */ + if (iec_m_pg[1] == arr[off + 1]) { + memcpy(iec_m_pg + 2, arr + off + 2, + sizeof(iec_m_pg) - 2); + goto set_mode_changed_ua; + } + break; + default: + break; + } + mk_sense_invalid_fld(scp, SDEB_IN_DATA, off, 5); + return check_condition_result; +set_mode_changed_ua: + set_bit(SDEBUG_UA_MODE_CHANGED, devip->uas_bm); + return 0; +} + +static int resp_temp_l_pg(unsigned char * arr) +{ + unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38, + 0x0, 0x1, 0x3, 0x2, 0x0, 65, + }; + + memcpy(arr, temp_l_pg, sizeof(temp_l_pg)); + return sizeof(temp_l_pg); +} + +static int resp_ie_l_pg(unsigned char * arr) +{ + unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38, + }; + + memcpy(arr, ie_l_pg, sizeof(ie_l_pg)); + if (iec_m_pg[2] & 0x4) { /* TEST bit set */ + arr[4] = THRESHOLD_EXCEEDED; + arr[5] = 0xff; + } + return sizeof(ie_l_pg); +} + +#define SDEBUG_MAX_LSENSE_SZ 512 + +static int resp_log_sense(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + int ppc, sp, pcontrol, pcode, subpcode, alloc_len, len, n; + unsigned char arr[SDEBUG_MAX_LSENSE_SZ]; + unsigned char *cmd = scp->cmnd; + + memset(arr, 0, sizeof(arr)); + ppc = cmd[1] & 0x2; + sp = cmd[1] & 0x1; + if (ppc || sp) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, ppc ? 1 : 0); + return check_condition_result; + } + pcontrol = (cmd[2] & 0xc0) >> 6; + pcode = cmd[2] & 0x3f; + subpcode = cmd[3] & 0xff; + alloc_len = (cmd[7] << 8) + cmd[8]; + arr[0] = pcode; + if (0 == subpcode) { + switch (pcode) { + case 0x0: /* Supported log pages log page */ + n = 4; + arr[n++] = 0x0; /* this page */ + arr[n++] = 0xd; /* Temperature */ + arr[n++] = 0x2f; /* Informational exceptions */ + arr[3] = n - 4; + break; + case 0xd: /* Temperature log page */ + arr[3] = resp_temp_l_pg(arr + 4); + break; + case 0x2f: /* Informational exceptions log page */ + arr[3] = resp_ie_l_pg(arr + 4); + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5); + return check_condition_result; + } + } else if (0xff == subpcode) { + arr[0] |= 0x40; + arr[1] = subpcode; + switch (pcode) { + case 0x0: /* Supported log pages and subpages log page */ + n = 4; + arr[n++] = 0x0; + arr[n++] = 0x0; /* 0,0 page */ + arr[n++] = 0x0; + arr[n++] = 0xff; /* this page */ + arr[n++] = 0xd; + arr[n++] = 0x0; /* Temperature */ + arr[n++] = 0x2f; + arr[n++] = 0x0; /* Informational exceptions */ + arr[3] = n - 4; + break; + case 0xd: /* Temperature subpages */ + n = 4; + arr[n++] = 0xd; + arr[n++] = 0x0; /* Temperature */ + arr[3] = n - 4; + break; + case 0x2f: /* Informational exceptions subpages */ + n = 4; + arr[n++] = 0x2f; + arr[n++] = 0x0; /* Informational exceptions */ + arr[3] = n - 4; + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5); + return check_condition_result; + } + } else { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len); + return fill_from_dev_buffer(scp, arr, + min(len, SDEBUG_MAX_INQ_ARR_SZ)); +} + +static int check_device_access_params(struct scsi_cmnd *scp, + unsigned long long lba, unsigned int num) +{ + if (lba + num > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (num > sdebug_store_sectors) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + return 0; +} + +/* Returns number of bytes copied or -1 if error. */ +static int +do_device_access(struct scsi_cmnd *scmd, u64 lba, u32 num, bool do_write) +{ + int ret; + u64 block, rest = 0; + struct scsi_data_buffer *sdb; + enum dma_data_direction dir; + size_t (*func)(struct scatterlist *, unsigned int, void *, size_t, + off_t); + + if (do_write) { + sdb = scsi_out(scmd); + dir = DMA_TO_DEVICE; + func = sg_pcopy_to_buffer; + } else { + sdb = scsi_in(scmd); + dir = DMA_FROM_DEVICE; + func = sg_pcopy_from_buffer; + } + + if (!sdb->length) + return 0; + if (!(scsi_bidi_cmnd(scmd) || scmd->sc_data_direction == dir)) + return -1; + + block = do_div(lba, sdebug_store_sectors); + if (block + num > sdebug_store_sectors) + rest = block + num - sdebug_store_sectors; + + ret = func(sdb->table.sgl, sdb->table.nents, + fake_storep + (block * scsi_debug_sector_size), + (num - rest) * scsi_debug_sector_size, 0); + if (ret != (num - rest) * scsi_debug_sector_size) + return ret; + + if (rest) { + ret += func(sdb->table.sgl, sdb->table.nents, + fake_storep, rest * scsi_debug_sector_size, + (num - rest) * scsi_debug_sector_size); + } + + return ret; +} + +/* If fake_store(lba,num) compares equal to arr(num), then copy top half of + * arr into fake_store(lba,num) and return true. If comparison fails then + * return false. */ +static bool +comp_write_worker(u64 lba, u32 num, const u8 *arr) +{ + bool res; + u64 block, rest = 0; + u32 store_blks = sdebug_store_sectors; + u32 lb_size = scsi_debug_sector_size; + + block = do_div(lba, store_blks); + if (block + num > store_blks) + rest = block + num - store_blks; + + res = !memcmp(fake_storep + (block * lb_size), arr, + (num - rest) * lb_size); + if (!res) + return res; + if (rest) + res = memcmp(fake_storep, arr + ((num - rest) * lb_size), + rest * lb_size); + if (!res) + return res; + arr += num * lb_size; + memcpy(fake_storep + (block * lb_size), arr, (num - rest) * lb_size); + if (rest) + memcpy(fake_storep, arr + ((num - rest) * lb_size), + rest * lb_size); + return res; +} + +static __be16 dif_compute_csum(const void *buf, int len) +{ + __be16 csum; + + if (scsi_debug_guard) + csum = (__force __be16)ip_compute_csum(buf, len); + else + csum = cpu_to_be16(crc_t10dif(buf, len)); + + return csum; +} + +static int dif_verify(struct sd_dif_tuple *sdt, const void *data, + sector_t sector, u32 ei_lba) +{ + __be16 csum = dif_compute_csum(data, scsi_debug_sector_size); + + if (sdt->guard_tag != csum) { + pr_err("%s: GUARD check failed on sector %lu rcvd 0x%04x, data 0x%04x\n", + __func__, + (unsigned long)sector, + be16_to_cpu(sdt->guard_tag), + be16_to_cpu(csum)); + return 0x01; + } + if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION && + be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { + pr_err("%s: REF check failed on sector %lu\n", + __func__, (unsigned long)sector); + return 0x03; + } + if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && + be32_to_cpu(sdt->ref_tag) != ei_lba) { + pr_err("%s: REF check failed on sector %lu\n", + __func__, (unsigned long)sector); + return 0x03; + } + return 0; +} + +static void dif_copy_prot(struct scsi_cmnd *SCpnt, sector_t sector, + unsigned int sectors, bool read) +{ + size_t resid; + void *paddr; + const void *dif_store_end = dif_storep + sdebug_store_sectors; + struct sg_mapping_iter miter; + + /* Bytes of protection data to copy into sgl */ + resid = sectors * sizeof(*dif_storep); + + sg_miter_start(&miter, scsi_prot_sglist(SCpnt), + scsi_prot_sg_count(SCpnt), SG_MITER_ATOMIC | + (read ? SG_MITER_TO_SG : SG_MITER_FROM_SG)); + + while (sg_miter_next(&miter) && resid > 0) { + size_t len = min(miter.length, resid); + void *start = dif_store(sector); + size_t rest = 0; + + if (dif_store_end < start + len) + rest = start + len - dif_store_end; + + paddr = miter.addr; + + if (read) + memcpy(paddr, start, len - rest); + else + memcpy(start, paddr, len - rest); + + if (rest) { + if (read) + memcpy(paddr + len - rest, dif_storep, rest); + else + memcpy(dif_storep, paddr + len - rest, rest); + } + + sector += len / sizeof(*dif_storep); + resid -= len; + } + sg_miter_stop(&miter); +} + +static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec, + unsigned int sectors, u32 ei_lba) +{ + unsigned int i; + struct sd_dif_tuple *sdt; + sector_t sector; + + for (i = 0; i < sectors; i++, ei_lba++) { + int ret; + + sector = start_sec + i; + sdt = dif_store(sector); + + if (sdt->app_tag == cpu_to_be16(0xffff)) + continue; + + ret = dif_verify(sdt, fake_store(sector), sector, ei_lba); + if (ret) { + dif_errors++; + return ret; + } + } + + dif_copy_prot(SCpnt, start_sec, sectors, true); + dix_reads++; + + return 0; +} + +static int +resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + u32 ei_lba; + unsigned long iflags; + int ret; + bool check_prot; + + switch (cmd[0]) { + case READ_16: + ei_lba = 0; + lba = get_unaligned_be64(cmd + 2); + num = get_unaligned_be32(cmd + 10); + check_prot = true; + break; + case READ_10: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = true; + break; + case READ_6: + ei_lba = 0; + lba = (u32)cmd[3] | (u32)cmd[2] << 8 | + (u32)(cmd[1] & 0x1f) << 16; + num = (0 == cmd[4]) ? 256 : cmd[4]; + check_prot = true; + break; + case READ_12: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be32(cmd + 6); + check_prot = true; + break; + case XDWRITEREAD_10: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = false; + break; + default: /* assume READ(32) */ + lba = get_unaligned_be64(cmd + 12); + ei_lba = get_unaligned_be32(cmd + 20); + num = get_unaligned_be32(cmd + 28); + check_prot = false; + break; + } + if (check_prot) { + if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && + (cmd[1] & 0xe0)) { + mk_sense_invalid_opcode(scp); + return check_condition_result; + } + if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION || + scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) && + (cmd[1] & 0xe0) == 0) + sdev_printk(KERN_ERR, scp->device, "Unprotected RD " + "to DIF device\n"); + } + if (sdebug_any_injecting_opt) { + struct sdebug_scmd_extra_t *ep = scsi_cmd_priv(scp); + + if (ep->inj_short) + num /= 2; + } + + /* inline check_device_access_params() */ + if (lba + num > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (num > sdebug_store_sectors) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + + if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) && + (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) && + ((lba + num) > OPT_MEDIUM_ERR_ADDR)) { + /* claim unrecoverable read error */ + mk_sense_buffer(scp, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0); + /* set info field and valid bit for fixed descriptor */ + if (0x70 == (scp->sense_buffer[0] & 0x7f)) { + scp->sense_buffer[0] |= 0x80; /* Valid bit */ + ret = (lba < OPT_MEDIUM_ERR_ADDR) + ? OPT_MEDIUM_ERR_ADDR : (int)lba; + put_unaligned_be32(ret, scp->sense_buffer + 3); + } + scsi_set_resid(scp, scsi_bufflen(scp)); + return check_condition_result; + } + + read_lock_irqsave(&atomic_rw, iflags); + + /* DIX + T10 DIF */ + if (scsi_debug_dix && scsi_prot_sg_count(scp)) { + int prot_ret = prot_verify_read(scp, lba, num, ei_lba); + + if (prot_ret) { + read_unlock_irqrestore(&atomic_rw, iflags); + mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, prot_ret); + return illegal_condition_result; + } + } + + ret = do_device_access(scp, lba, num, false); + read_unlock_irqrestore(&atomic_rw, iflags); + if (ret == -1) + return DID_ERROR << 16; + + scsi_in(scp)->resid = scsi_bufflen(scp) - ret; + + if (sdebug_any_injecting_opt) { + struct sdebug_scmd_extra_t *ep = scsi_cmd_priv(scp); + + if (ep->inj_recovered) { + mk_sense_buffer(scp, RECOVERED_ERROR, + THRESHOLD_EXCEEDED, 0); + return check_condition_result; + } else if (ep->inj_transport) { + mk_sense_buffer(scp, ABORTED_COMMAND, + TRANSPORT_PROBLEM, ACK_NAK_TO); + return check_condition_result; + } else if (ep->inj_dif) { + /* Logical block guard check failed */ + mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, 1); + return illegal_condition_result; + } else if (ep->inj_dix) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, 1); + return illegal_condition_result; + } + } + return 0; +} + +void dump_sector(unsigned char *buf, int len) +{ + int i, j, n; + + pr_err(">>> Sector Dump <<<\n"); + for (i = 0 ; i < len ; i += 16) { + char b[128]; + + for (j = 0, n = 0; j < 16; j++) { + unsigned char c = buf[i+j]; + + if (c >= 0x20 && c < 0x7e) + n += scnprintf(b + n, sizeof(b) - n, + " %c ", buf[i+j]); + else + n += scnprintf(b + n, sizeof(b) - n, + "%02x ", buf[i+j]); + } + pr_err("%04d: %s\n", i, b); + } +} + +static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec, + unsigned int sectors, u32 ei_lba) +{ + int ret; + struct sd_dif_tuple *sdt; + void *daddr; + sector_t sector = start_sec; + int ppage_offset; + int dpage_offset; + struct sg_mapping_iter diter; + struct sg_mapping_iter piter; + + BUG_ON(scsi_sg_count(SCpnt) == 0); + BUG_ON(scsi_prot_sg_count(SCpnt) == 0); + + sg_miter_start(&piter, scsi_prot_sglist(SCpnt), + scsi_prot_sg_count(SCpnt), + SG_MITER_ATOMIC | SG_MITER_FROM_SG); + sg_miter_start(&diter, scsi_sglist(SCpnt), scsi_sg_count(SCpnt), + SG_MITER_ATOMIC | SG_MITER_FROM_SG); + + /* For each protection page */ + while (sg_miter_next(&piter)) { + dpage_offset = 0; + if (WARN_ON(!sg_miter_next(&diter))) { + ret = 0x01; + goto out; + } + + for (ppage_offset = 0; ppage_offset < piter.length; + ppage_offset += sizeof(struct sd_dif_tuple)) { + /* If we're at the end of the current + * data page advance to the next one + */ + if (dpage_offset >= diter.length) { + if (WARN_ON(!sg_miter_next(&diter))) { + ret = 0x01; + goto out; + } + dpage_offset = 0; + } + + sdt = piter.addr + ppage_offset; + daddr = diter.addr + dpage_offset; + + ret = dif_verify(sdt, daddr, sector, ei_lba); + if (ret) { + dump_sector(daddr, scsi_debug_sector_size); + goto out; + } + + sector++; + ei_lba++; + dpage_offset += scsi_debug_sector_size; + } + diter.consumed = dpage_offset; + sg_miter_stop(&diter); + } + sg_miter_stop(&piter); + + dif_copy_prot(SCpnt, start_sec, sectors, false); + dix_writes++; + + return 0; + +out: + dif_errors++; + sg_miter_stop(&diter); + sg_miter_stop(&piter); + return ret; +} + +static unsigned long lba_to_map_index(sector_t lba) +{ + if (scsi_debug_unmap_alignment) { + lba += scsi_debug_unmap_granularity - + scsi_debug_unmap_alignment; + } + do_div(lba, scsi_debug_unmap_granularity); + + return lba; +} + +static sector_t map_index_to_lba(unsigned long index) +{ + sector_t lba = index * scsi_debug_unmap_granularity; + + if (scsi_debug_unmap_alignment) { + lba -= scsi_debug_unmap_granularity - + scsi_debug_unmap_alignment; + } + + return lba; +} + +static unsigned int map_state(sector_t lba, unsigned int *num) +{ + sector_t end; + unsigned int mapped; + unsigned long index; + unsigned long next; + + index = lba_to_map_index(lba); + mapped = test_bit(index, map_storep); + + if (mapped) + next = find_next_zero_bit(map_storep, map_size, index); + else + next = find_next_bit(map_storep, map_size, index); + + end = min_t(sector_t, sdebug_store_sectors, map_index_to_lba(next)); + *num = end - lba; + + return mapped; +} + +static void map_region(sector_t lba, unsigned int len) +{ + sector_t end = lba + len; + + while (lba < end) { + unsigned long index = lba_to_map_index(lba); + + if (index < map_size) + set_bit(index, map_storep); + + lba = map_index_to_lba(index + 1); + } +} + +static void unmap_region(sector_t lba, unsigned int len) +{ + sector_t end = lba + len; + + while (lba < end) { + unsigned long index = lba_to_map_index(lba); + + if (lba == map_index_to_lba(index) && + lba + scsi_debug_unmap_granularity <= end && + index < map_size) { + clear_bit(index, map_storep); + if (scsi_debug_lbprz) { + memset(fake_storep + + lba * scsi_debug_sector_size, 0, + scsi_debug_sector_size * + scsi_debug_unmap_granularity); + } + if (dif_storep) { + memset(dif_storep + lba, 0xff, + sizeof(*dif_storep) * + scsi_debug_unmap_granularity); + } + } + lba = map_index_to_lba(index + 1); + } +} + +static int +resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + u32 ei_lba; + unsigned long iflags; + int ret; + bool check_prot; + + switch (cmd[0]) { + case WRITE_16: + ei_lba = 0; + lba = get_unaligned_be64(cmd + 2); + num = get_unaligned_be32(cmd + 10); + check_prot = true; + break; + case WRITE_10: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = true; + break; + case WRITE_6: + ei_lba = 0; + lba = (u32)cmd[3] | (u32)cmd[2] << 8 | + (u32)(cmd[1] & 0x1f) << 16; + num = (0 == cmd[4]) ? 256 : cmd[4]; + check_prot = true; + break; + case WRITE_12: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be32(cmd + 6); + check_prot = true; + break; + case 0x53: /* XDWRITEREAD(10) */ + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = false; + break; + default: /* assume WRITE(32) */ + lba = get_unaligned_be64(cmd + 12); + ei_lba = get_unaligned_be32(cmd + 20); + num = get_unaligned_be32(cmd + 28); + check_prot = false; + break; + } + if (check_prot) { + if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && + (cmd[1] & 0xe0)) { + mk_sense_invalid_opcode(scp); + return check_condition_result; + } + if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION || + scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) && + (cmd[1] & 0xe0) == 0) + sdev_printk(KERN_ERR, scp->device, "Unprotected WR " + "to DIF device\n"); + } + + /* inline check_device_access_params() */ + if (lba + num > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (num > sdebug_store_sectors) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + + write_lock_irqsave(&atomic_rw, iflags); + + /* DIX + T10 DIF */ + if (scsi_debug_dix && scsi_prot_sg_count(scp)) { + int prot_ret = prot_verify_write(scp, lba, num, ei_lba); + + if (prot_ret) { + write_unlock_irqrestore(&atomic_rw, iflags); + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, prot_ret); + return illegal_condition_result; + } + } + + ret = do_device_access(scp, lba, num, true); + if (scsi_debug_lbp()) + map_region(lba, num); + write_unlock_irqrestore(&atomic_rw, iflags); + if (-1 == ret) + return (DID_ERROR << 16); + else if ((ret < (num * scsi_debug_sector_size)) && + (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, scp->device, + "%s: write: cdb indicated=%u, IO sent=%d bytes\n", + my_name, num * scsi_debug_sector_size, ret); + + if (sdebug_any_injecting_opt) { + struct sdebug_scmd_extra_t *ep = scsi_cmd_priv(scp); + + if (ep->inj_recovered) { + mk_sense_buffer(scp, RECOVERED_ERROR, + THRESHOLD_EXCEEDED, 0); + return check_condition_result; + } else if (ep->inj_dif) { + /* Logical block guard check failed */ + mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, 1); + return illegal_condition_result; + } else if (ep->inj_dix) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, 1); + return illegal_condition_result; + } + } + return 0; +} + +static int +resp_write_same(struct scsi_cmnd *scp, u64 lba, u32 num, u32 ei_lba, + bool unmap, bool ndob) +{ + unsigned long iflags; + unsigned long long i; + int ret; + + ret = check_device_access_params(scp, lba, num); + if (ret) + return ret; + + write_lock_irqsave(&atomic_rw, iflags); + + if (unmap && scsi_debug_lbp()) { + unmap_region(lba, num); + goto out; + } + + /* if ndob then zero 1 logical block, else fetch 1 logical block */ + if (ndob) { + memset(fake_storep + (lba * scsi_debug_sector_size), 0, + scsi_debug_sector_size); + ret = 0; + } else + ret = fetch_to_dev_buffer(scp, fake_storep + + (lba * scsi_debug_sector_size), + scsi_debug_sector_size); + + if (-1 == ret) { + write_unlock_irqrestore(&atomic_rw, iflags); + return (DID_ERROR << 16); + } else if ((ret < (num * scsi_debug_sector_size)) && + (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: cdb indicated=%u, IO sent=%d bytes\n", + my_name, "write same", + num * scsi_debug_sector_size, ret); + + /* Copy first sector to remaining blocks */ + for (i = 1 ; i < num ; i++) + memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size), + fake_storep + (lba * scsi_debug_sector_size), + scsi_debug_sector_size); + + if (scsi_debug_lbp()) + map_region(lba, num); +out: + write_unlock_irqrestore(&atomic_rw, iflags); + + return 0; +} + +static int +resp_write_same_10(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u32 lba; + u16 num; + u32 ei_lba = 0; + bool unmap = false; + + if (cmd[1] & 0x8) { + if (scsi_debug_lbpws10 == 0) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 3); + return check_condition_result; + } else + unmap = true; + } + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + if (num > scsi_debug_write_same_length) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 7, -1); + return check_condition_result; + } + return resp_write_same(scp, lba, num, ei_lba, unmap, false); +} + +static int +resp_write_same_16(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + u32 ei_lba = 0; + bool unmap = false; + bool ndob = false; + + if (cmd[1] & 0x8) { /* UNMAP */ + if (scsi_debug_lbpws == 0) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 3); + return check_condition_result; + } else + unmap = true; + } + if (cmd[1] & 0x1) /* NDOB (no data-out buffer, assumes zeroes) */ + ndob = true; + lba = get_unaligned_be64(cmd + 2); + num = get_unaligned_be32(cmd + 10); + if (num > scsi_debug_write_same_length) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 10, -1); + return check_condition_result; + } + return resp_write_same(scp, lba, num, ei_lba, unmap, ndob); +} + +/* Note the mode field is in the same position as the (lower) service action + * field. For the Report supported operation codes command, SPC-4 suggests + * each mode of this command should be reported separately; for future. */ +static int +resp_write_buffer(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + struct scsi_device *sdp = scp->device; + struct sdebug_dev_info *dp; + u8 mode; + + mode = cmd[1] & 0x1f; + switch (mode) { + case 0x4: /* download microcode (MC) and activate (ACT) */ + /* set UAs on this device only */ + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + set_bit(SDEBUG_UA_MICROCODE_CHANGED, devip->uas_bm); + break; + case 0x5: /* download MC, save and ACT */ + set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET, devip->uas_bm); + break; + case 0x6: /* download MC with offsets and ACT */ + /* set UAs on most devices (LUs) in this target */ + list_for_each_entry(dp, + &devip->sdbg_host->dev_info_list, + dev_list) + if (dp->target == sdp->id) { + set_bit(SDEBUG_UA_BUS_RESET, dp->uas_bm); + if (devip != dp) + set_bit(SDEBUG_UA_MICROCODE_CHANGED, + dp->uas_bm); + } + break; + case 0x7: /* download MC with offsets, save, and ACT */ + /* set UA on all devices (LUs) in this target */ + list_for_each_entry(dp, + &devip->sdbg_host->dev_info_list, + dev_list) + if (dp->target == sdp->id) + set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET, + dp->uas_bm); + break; + default: + /* do nothing for this command for other mode values */ + break; + } + return 0; +} + +static int +resp_comp_write(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u8 *arr; + u8 *fake_storep_hold; + u64 lba; + u32 dnum; + u32 lb_size = scsi_debug_sector_size; + u8 num; + unsigned long iflags; + int ret; + int retval = 0; + + lba = get_unaligned_be64(cmd + 2); + num = cmd[13]; /* 1 to a maximum of 255 logical blocks */ + if (0 == num) + return 0; /* degenerate case, not an error */ + if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION && + (cmd[1] & 0xe0)) { + mk_sense_invalid_opcode(scp); + return check_condition_result; + } + if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION || + scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) && + (cmd[1] & 0xe0) == 0) + sdev_printk(KERN_ERR, scp->device, "Unprotected WR " + "to DIF device\n"); + + /* inline check_device_access_params() */ + if (lba + num > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (num > sdebug_store_sectors) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + dnum = 2 * num; + arr = kzalloc(dnum * lb_size, GFP_ATOMIC); + if (NULL == arr) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + + write_lock_irqsave(&atomic_rw, iflags); + + /* trick do_device_access() to fetch both compare and write buffers + * from data-in into arr. Safe (atomic) since write_lock held. */ + fake_storep_hold = fake_storep; + fake_storep = arr; + ret = do_device_access(scp, 0, dnum, true); + fake_storep = fake_storep_hold; + if (ret == -1) { + retval = DID_ERROR << 16; + goto cleanup; + } else if ((ret < (dnum * lb_size)) && + (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, scp->device, "%s: compare_write: cdb " + "indicated=%u, IO sent=%d bytes\n", my_name, + dnum * lb_size, ret); + if (!comp_write_worker(lba, num, arr)) { + mk_sense_buffer(scp, MISCOMPARE, MISCOMPARE_VERIFY_ASC, 0); + retval = check_condition_result; + goto cleanup; + } + if (scsi_debug_lbp()) + map_region(lba, num); +cleanup: + write_unlock_irqrestore(&atomic_rw, iflags); + kfree(arr); + return retval; +} + +struct unmap_block_desc { + __be64 lba; + __be32 blocks; + __be32 __reserved; +}; + +static int +resp_unmap(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + unsigned char *buf; + struct unmap_block_desc *desc; + unsigned int i, payload_len, descriptors; + int ret; + unsigned long iflags; + + + if (!scsi_debug_lbp()) + return 0; /* fib and say its done */ + payload_len = get_unaligned_be16(scp->cmnd + 7); + BUG_ON(scsi_bufflen(scp) != payload_len); + + descriptors = (payload_len - 8) / 16; + if (descriptors > scsi_debug_unmap_max_desc) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 7, -1); + return check_condition_result; + } + + buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC); + if (!buf) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + + scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp)); + + BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2); + BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16); + + desc = (void *)&buf[8]; + + write_lock_irqsave(&atomic_rw, iflags); + + for (i = 0 ; i < descriptors ; i++) { + unsigned long long lba = get_unaligned_be64(&desc[i].lba); + unsigned int num = get_unaligned_be32(&desc[i].blocks); + + ret = check_device_access_params(scp, lba, num); + if (ret) + goto out; + + unmap_region(lba, num); + } + + ret = 0; + +out: + write_unlock_irqrestore(&atomic_rw, iflags); + kfree(buf); + + return ret; +} + +#define SDEBUG_GET_LBA_STATUS_LEN 32 + +static int +resp_get_lba_status(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 alloc_len, mapped, num; + u8 arr[SDEBUG_GET_LBA_STATUS_LEN]; + int ret; + + lba = get_unaligned_be64(cmd + 2); + alloc_len = get_unaligned_be32(cmd + 10); + + if (alloc_len < 24) + return 0; + + ret = check_device_access_params(scp, lba, 1); + if (ret) + return ret; + + if (scsi_debug_lbp()) + mapped = map_state(lba, &num); + else { + mapped = 1; + /* following just in case virtual_gb changed */ + sdebug_capacity = get_sdebug_capacity(); + if (sdebug_capacity - lba <= 0xffffffff) + num = sdebug_capacity - lba; + else + num = 0xffffffff; + } + + memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN); + put_unaligned_be32(20, arr); /* Parameter Data Length */ + put_unaligned_be64(lba, arr + 8); /* LBA */ + put_unaligned_be32(num, arr + 16); /* Number of blocks */ + arr[20] = !mapped; /* prov_stat=0: mapped; 1: dealloc */ + + return fill_from_dev_buffer(scp, arr, SDEBUG_GET_LBA_STATUS_LEN); +} + +#define SDEBUG_RLUN_ARR_SZ 256 + +static int resp_report_luns(struct scsi_cmnd * scp, + struct sdebug_dev_info * devip) +{ + unsigned int alloc_len; + int lun_cnt, i, upper, num, n, want_wlun, shortish; + u64 lun; + unsigned char *cmd = scp->cmnd; + int select_report = (int)cmd[2]; + struct scsi_lun *one_lun; + unsigned char arr[SDEBUG_RLUN_ARR_SZ]; + unsigned char * max_addr; + + clear_luns_changed_on_target(devip); + alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24); + shortish = (alloc_len < 4); + if (shortish || (select_report > 2)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, shortish ? 6 : 2, -1); + return check_condition_result; + } + /* can produce response with up to 16k luns (lun 0 to lun 16383) */ + memset(arr, 0, SDEBUG_RLUN_ARR_SZ); + lun_cnt = scsi_debug_max_luns; + if (1 == select_report) + lun_cnt = 0; + else if (scsi_debug_no_lun_0 && (lun_cnt > 0)) + --lun_cnt; + want_wlun = (select_report > 0) ? 1 : 0; + num = lun_cnt + want_wlun; + arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff; + arr[3] = (sizeof(struct scsi_lun) * num) & 0xff; + n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) / + sizeof(struct scsi_lun)), num); + if (n < num) { + want_wlun = 0; + lun_cnt = n; + } + one_lun = (struct scsi_lun *) &arr[8]; + max_addr = arr + SDEBUG_RLUN_ARR_SZ; + for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0); + ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr)); + i++, lun++) { + upper = (lun >> 8) & 0x3f; + if (upper) + one_lun[i].scsi_lun[0] = + (upper | (SAM2_LUN_ADDRESS_METHOD << 6)); + one_lun[i].scsi_lun[1] = lun & 0xff; + } + if (want_wlun) { + one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff; + one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff; + i++; + } + alloc_len = (unsigned char *)(one_lun + i) - arr; + return fill_from_dev_buffer(scp, arr, + min((int)alloc_len, SDEBUG_RLUN_ARR_SZ)); +} + +static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba, + unsigned int num, struct sdebug_dev_info *devip) +{ + int j; + unsigned char *kaddr, *buf; + unsigned int offset; + struct scsi_data_buffer *sdb = scsi_in(scp); + struct sg_mapping_iter miter; + + /* better not to use temporary buffer. */ + buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC); + if (!buf) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + + scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp)); + + offset = 0; + sg_miter_start(&miter, sdb->table.sgl, sdb->table.nents, + SG_MITER_ATOMIC | SG_MITER_TO_SG); + + while (sg_miter_next(&miter)) { + kaddr = miter.addr; + for (j = 0; j < miter.length; j++) + *(kaddr + j) ^= *(buf + offset + j); + + offset += miter.length; + } + sg_miter_stop(&miter); + kfree(buf); + + return 0; +} + +static int +resp_xdwriteread_10(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + int errsts; + + if (!scsi_bidi_cmnd(scp)) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + errsts = resp_read_dt0(scp, devip); + if (errsts) + return errsts; + if (!(cmd[1] & 0x4)) { /* DISABLE_WRITE is not set */ + errsts = resp_write_dt0(scp, devip); + if (errsts) + return errsts; + } + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + return resp_xdwriteread(scp, lba, num, devip); +} + +/* When timer or tasklet goes off this function is called. */ +static void sdebug_q_cmd_complete(unsigned long indx) +{ + int qa_indx; + int retiring = 0; + unsigned long iflags; + struct sdebug_queued_cmd *sqcp; + struct scsi_cmnd *scp; + struct sdebug_dev_info *devip; + + atomic_inc(&sdebug_completions); + qa_indx = indx; + if ((qa_indx < 0) || (qa_indx >= SCSI_DEBUG_CANQUEUE)) { + pr_err("%s: wild qa_indx=%d\n", __func__, qa_indx); + return; + } + spin_lock_irqsave(&queued_arr_lock, iflags); + sqcp = &queued_arr[qa_indx]; + scp = sqcp->a_cmnd; + if (NULL == scp) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + pr_err("%s: scp is NULL\n", __func__); + return; + } + devip = (struct sdebug_dev_info *)scp->device->hostdata; + if (devip) + atomic_dec(&devip->num_in_q); + else + pr_err("%s: devip=NULL\n", __func__); + if (atomic_read(&retired_max_queue) > 0) + retiring = 1; + + sqcp->a_cmnd = NULL; + if (!test_and_clear_bit(qa_indx, queued_in_use_bm)) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + pr_err("%s: Unexpected completion\n", __func__); + return; + } + + if (unlikely(retiring)) { /* user has reduced max_queue */ + int k, retval; + + retval = atomic_read(&retired_max_queue); + if (qa_indx >= retval) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + pr_err("%s: index %d too large\n", __func__, retval); + return; + } + k = find_last_bit(queued_in_use_bm, retval); + if ((k < scsi_debug_max_queue) || (k == retval)) + atomic_set(&retired_max_queue, 0); + else + atomic_set(&retired_max_queue, k + 1); + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); + scp->scsi_done(scp); /* callback to mid level */ +} + +/* When high resolution timer goes off this function is called. */ +static enum hrtimer_restart +sdebug_q_cmd_hrt_complete(struct hrtimer *timer) +{ + int qa_indx; + int retiring = 0; + unsigned long iflags; + struct sdebug_hrtimer *sd_hrtp = (struct sdebug_hrtimer *)timer; + struct sdebug_queued_cmd *sqcp; + struct scsi_cmnd *scp; + struct sdebug_dev_info *devip; + + atomic_inc(&sdebug_completions); + qa_indx = sd_hrtp->qa_indx; + if ((qa_indx < 0) || (qa_indx >= SCSI_DEBUG_CANQUEUE)) { + pr_err("%s: wild qa_indx=%d\n", __func__, qa_indx); + goto the_end; + } + spin_lock_irqsave(&queued_arr_lock, iflags); + sqcp = &queued_arr[qa_indx]; + scp = sqcp->a_cmnd; + if (NULL == scp) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + pr_err("%s: scp is NULL\n", __func__); + goto the_end; + } + devip = (struct sdebug_dev_info *)scp->device->hostdata; + if (devip) + atomic_dec(&devip->num_in_q); + else + pr_err("%s: devip=NULL\n", __func__); + if (atomic_read(&retired_max_queue) > 0) + retiring = 1; + + sqcp->a_cmnd = NULL; + if (!test_and_clear_bit(qa_indx, queued_in_use_bm)) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + pr_err("%s: Unexpected completion\n", __func__); + goto the_end; + } + + if (unlikely(retiring)) { /* user has reduced max_queue */ + int k, retval; + + retval = atomic_read(&retired_max_queue); + if (qa_indx >= retval) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + pr_err("%s: index %d too large\n", __func__, retval); + goto the_end; + } + k = find_last_bit(queued_in_use_bm, retval); + if ((k < scsi_debug_max_queue) || (k == retval)) + atomic_set(&retired_max_queue, 0); + else + atomic_set(&retired_max_queue, k + 1); + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); + scp->scsi_done(scp); /* callback to mid level */ +the_end: + return HRTIMER_NORESTART; +} + +static struct sdebug_dev_info * +sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags) +{ + struct sdebug_dev_info *devip; + + devip = kzalloc(sizeof(*devip), flags); + if (devip) { + devip->sdbg_host = sdbg_host; + list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list); + } + return devip; +} + +static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev) +{ + struct sdebug_host_info * sdbg_host; + struct sdebug_dev_info * open_devip = NULL; + struct sdebug_dev_info * devip = + (struct sdebug_dev_info *)sdev->hostdata; + + if (devip) + return devip; + sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host); + if (!sdbg_host) { + pr_err("%s: Host info NULL\n", __func__); + return NULL; + } + list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) { + if ((devip->used) && (devip->channel == sdev->channel) && + (devip->target == sdev->id) && + (devip->lun == sdev->lun)) + return devip; + else { + if ((!devip->used) && (!open_devip)) + open_devip = devip; + } + } + if (!open_devip) { /* try and make a new one */ + open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC); + if (!open_devip) { + printk(KERN_ERR "%s: out of memory at line %d\n", + __func__, __LINE__); + return NULL; + } + } + + open_devip->channel = sdev->channel; + open_devip->target = sdev->id; + open_devip->lun = sdev->lun; + open_devip->sdbg_host = sdbg_host; + atomic_set(&open_devip->num_in_q, 0); + set_bit(SDEBUG_UA_POR, open_devip->uas_bm); + open_devip->used = true; + return open_devip; +} + +static int scsi_debug_slave_alloc(struct scsi_device *sdp) +{ + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) + printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %llu>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue); + return 0; +} + +static int scsi_debug_slave_configure(struct scsi_device *sdp) +{ + struct sdebug_dev_info *devip; + + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) + printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %llu>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN) + sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN; + devip = devInfoReg(sdp); + if (NULL == devip) + return 1; /* no resources, will be marked offline */ + sdp->hostdata = devip; + blk_queue_max_segment_size(sdp->request_queue, -1U); + if (scsi_debug_no_uld) + sdp->no_uld_attach = 1; + return 0; +} + +static void scsi_debug_slave_destroy(struct scsi_device *sdp) +{ + struct sdebug_dev_info *devip = + (struct sdebug_dev_info *)sdp->hostdata; + + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) + printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %llu>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + if (devip) { + /* make this slot available for re-use */ + devip->used = false; + sdp->hostdata = NULL; + } +} + +/* Returns 1 if cmnd found (deletes its timer or tasklet), else returns 0 */ +static int stop_queued_cmnd(struct scsi_cmnd *cmnd) +{ + unsigned long iflags; + int k, qmax, r_qmax; + struct sdebug_queued_cmd *sqcp; + struct sdebug_dev_info *devip; + + spin_lock_irqsave(&queued_arr_lock, iflags); + qmax = scsi_debug_max_queue; + r_qmax = atomic_read(&retired_max_queue); + if (r_qmax > qmax) + qmax = r_qmax; + for (k = 0; k < qmax; ++k) { + if (test_bit(k, queued_in_use_bm)) { + sqcp = &queued_arr[k]; + if (cmnd == sqcp->a_cmnd) { + devip = (struct sdebug_dev_info *) + cmnd->device->hostdata; + if (devip) + atomic_dec(&devip->num_in_q); + sqcp->a_cmnd = NULL; + spin_unlock_irqrestore(&queued_arr_lock, + iflags); + if (scsi_debug_ndelay > 0) { + if (sqcp->sd_hrtp) + hrtimer_cancel( + &sqcp->sd_hrtp->hrt); + } else if (scsi_debug_delay > 0) { + if (sqcp->cmnd_timerp) + del_timer_sync( + sqcp->cmnd_timerp); + } else if (scsi_debug_delay < 0) { + if (sqcp->tletp) + tasklet_kill(sqcp->tletp); + } + clear_bit(k, queued_in_use_bm); + return 1; + } + } + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); + return 0; +} + +/* Deletes (stops) timers or tasklets of all queued commands */ +static void stop_all_queued(void) +{ + unsigned long iflags; + int k; + struct sdebug_queued_cmd *sqcp; + struct sdebug_dev_info *devip; + + spin_lock_irqsave(&queued_arr_lock, iflags); + for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { + if (test_bit(k, queued_in_use_bm)) { + sqcp = &queued_arr[k]; + if (sqcp->a_cmnd) { + devip = (struct sdebug_dev_info *) + sqcp->a_cmnd->device->hostdata; + if (devip) + atomic_dec(&devip->num_in_q); + sqcp->a_cmnd = NULL; + spin_unlock_irqrestore(&queued_arr_lock, + iflags); + if (scsi_debug_ndelay > 0) { + if (sqcp->sd_hrtp) + hrtimer_cancel( + &sqcp->sd_hrtp->hrt); + } else if (scsi_debug_delay > 0) { + if (sqcp->cmnd_timerp) + del_timer_sync( + sqcp->cmnd_timerp); + } else if (scsi_debug_delay < 0) { + if (sqcp->tletp) + tasklet_kill(sqcp->tletp); + } + clear_bit(k, queued_in_use_bm); + spin_lock_irqsave(&queued_arr_lock, iflags); + } + } + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); +} + +/* Free queued command memory on heap */ +static void free_all_queued(void) +{ + unsigned long iflags; + int k; + struct sdebug_queued_cmd *sqcp; + + spin_lock_irqsave(&queued_arr_lock, iflags); + for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { + sqcp = &queued_arr[k]; + kfree(sqcp->cmnd_timerp); + sqcp->cmnd_timerp = NULL; + kfree(sqcp->tletp); + sqcp->tletp = NULL; + kfree(sqcp->sd_hrtp); + sqcp->sd_hrtp = NULL; + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); +} + +static int scsi_debug_abort(struct scsi_cmnd *SCpnt) +{ + ++num_aborts; + if (SCpnt) { + if (SCpnt->device && + (SCSI_DEBUG_OPT_ALL_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, SCpnt->device, "%s\n", + __func__); + stop_queued_cmnd(SCpnt); + } + return SUCCESS; +} + +static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt) +{ + struct sdebug_dev_info * devip; + + ++num_dev_resets; + if (SCpnt && SCpnt->device) { + struct scsi_device *sdp = SCpnt->device; + + if (SCSI_DEBUG_OPT_ALL_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, sdp, "%s\n", __func__); + devip = devInfoReg(sdp); + if (devip) + set_bit(SDEBUG_UA_POR, devip->uas_bm); + } + return SUCCESS; +} + +static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *devip; + struct scsi_device *sdp; + struct Scsi_Host *hp; + int k = 0; + + ++num_target_resets; + if (!SCpnt) + goto lie; + sdp = SCpnt->device; + if (!sdp) + goto lie; + if (SCSI_DEBUG_OPT_ALL_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, sdp, "%s\n", __func__); + hp = sdp->host; + if (!hp) + goto lie; + sdbg_host = *(struct sdebug_host_info **)shost_priv(hp); + if (sdbg_host) { + list_for_each_entry(devip, + &sdbg_host->dev_info_list, + dev_list) + if (devip->target == sdp->id) { + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + ++k; + } + } + if (SCSI_DEBUG_OPT_RESET_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, sdp, + "%s: %d device(s) found in target\n", __func__, k); +lie: + return SUCCESS; +} + +static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *devip; + struct scsi_device * sdp; + struct Scsi_Host * hp; + int k = 0; + + ++num_bus_resets; + if (!(SCpnt && SCpnt->device)) + goto lie; + sdp = SCpnt->device; + if (SCSI_DEBUG_OPT_ALL_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, sdp, "%s\n", __func__); + hp = sdp->host; + if (hp) { + sdbg_host = *(struct sdebug_host_info **)shost_priv(hp); + if (sdbg_host) { + list_for_each_entry(devip, + &sdbg_host->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + ++k; + } + } + } + if (SCSI_DEBUG_OPT_RESET_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, sdp, + "%s: %d device(s) found in host\n", __func__, k); +lie: + return SUCCESS; +} + +static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt) +{ + struct sdebug_host_info * sdbg_host; + struct sdebug_dev_info *devip; + int k = 0; + + ++num_host_resets; + if ((SCpnt->device) && (SCSI_DEBUG_OPT_ALL_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, SCpnt->device, "%s\n", __func__); + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { + list_for_each_entry(devip, &sdbg_host->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + ++k; + } + } + spin_unlock(&sdebug_host_list_lock); + stop_all_queued(); + if (SCSI_DEBUG_OPT_RESET_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, SCpnt->device, + "%s: %d device(s) found\n", __func__, k); + return SUCCESS; +} + +static void __init sdebug_build_parts(unsigned char *ramp, + unsigned long store_size) +{ + struct partition * pp; + int starts[SDEBUG_MAX_PARTS + 2]; + int sectors_per_part, num_sectors, k; + int heads_by_sects, start_sec, end_sec; + + /* assume partition table already zeroed */ + if ((scsi_debug_num_parts < 1) || (store_size < 1048576)) + return; + if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) { + scsi_debug_num_parts = SDEBUG_MAX_PARTS; + pr_warn("%s: reducing partitions to %d\n", __func__, + SDEBUG_MAX_PARTS); + } + num_sectors = (int)sdebug_store_sectors; + sectors_per_part = (num_sectors - sdebug_sectors_per) + / scsi_debug_num_parts; + heads_by_sects = sdebug_heads * sdebug_sectors_per; + starts[0] = sdebug_sectors_per; + for (k = 1; k < scsi_debug_num_parts; ++k) + starts[k] = ((k * sectors_per_part) / heads_by_sects) + * heads_by_sects; + starts[scsi_debug_num_parts] = num_sectors; + starts[scsi_debug_num_parts + 1] = 0; + + ramp[510] = 0x55; /* magic partition markings */ + ramp[511] = 0xAA; + pp = (struct partition *)(ramp + 0x1be); + for (k = 0; starts[k + 1]; ++k, ++pp) { + start_sec = starts[k]; + end_sec = starts[k + 1] - 1; + pp->boot_ind = 0; + + pp->cyl = start_sec / heads_by_sects; + pp->head = (start_sec - (pp->cyl * heads_by_sects)) + / sdebug_sectors_per; + pp->sector = (start_sec % sdebug_sectors_per) + 1; + + pp->end_cyl = end_sec / heads_by_sects; + pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects)) + / sdebug_sectors_per; + pp->end_sector = (end_sec % sdebug_sectors_per) + 1; + + pp->start_sect = cpu_to_le32(start_sec); + pp->nr_sects = cpu_to_le32(end_sec - start_sec + 1); + pp->sys_ind = 0x83; /* plain Linux partition */ + } +} + +static int +schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, + int scsi_result, int delta_jiff) +{ + unsigned long iflags; + int k, num_in_q, qdepth, inject; + struct sdebug_queued_cmd *sqcp = NULL; + struct scsi_device *sdp = cmnd->device; + + if (NULL == cmnd || NULL == devip) { + pr_warn("%s: called with NULL cmnd or devip pointer\n", + __func__); + /* no particularly good error to report back */ + return SCSI_MLQUEUE_HOST_BUSY; + } + if ((scsi_result) && (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)) + sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n", + __func__, scsi_result); + if (delta_jiff == 0) + goto respond_in_thread; + + /* schedule the response at a later time if resources permit */ + spin_lock_irqsave(&queued_arr_lock, iflags); + num_in_q = atomic_read(&devip->num_in_q); + qdepth = cmnd->device->queue_depth; + inject = 0; + if ((qdepth > 0) && (num_in_q >= qdepth)) { + if (scsi_result) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + goto respond_in_thread; + } else + scsi_result = device_qfull_result; + } else if ((scsi_debug_every_nth != 0) && + (SCSI_DEBUG_OPT_RARE_TSF & scsi_debug_opts) && + (scsi_result == 0)) { + if ((num_in_q == (qdepth - 1)) && + (atomic_inc_return(&sdebug_a_tsf) >= + abs(scsi_debug_every_nth))) { + atomic_set(&sdebug_a_tsf, 0); + inject = 1; + scsi_result = device_qfull_result; + } + } + + k = find_first_zero_bit(queued_in_use_bm, scsi_debug_max_queue); + if (k >= scsi_debug_max_queue) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + if (scsi_result) + goto respond_in_thread; + else if (SCSI_DEBUG_OPT_ALL_TSF & scsi_debug_opts) + scsi_result = device_qfull_result; + if (SCSI_DEBUG_OPT_Q_NOISE & scsi_debug_opts) + sdev_printk(KERN_INFO, sdp, + "%s: max_queue=%d exceeded, %s\n", + __func__, scsi_debug_max_queue, + (scsi_result ? "status: TASK SET FULL" : + "report: host busy")); + if (scsi_result) + goto respond_in_thread; + else + return SCSI_MLQUEUE_HOST_BUSY; + } + __set_bit(k, queued_in_use_bm); + atomic_inc(&devip->num_in_q); + sqcp = &queued_arr[k]; + sqcp->a_cmnd = cmnd; + cmnd->result = scsi_result; + spin_unlock_irqrestore(&queued_arr_lock, iflags); + if (delta_jiff > 0) { + if (NULL == sqcp->cmnd_timerp) { + sqcp->cmnd_timerp = kmalloc(sizeof(struct timer_list), + GFP_ATOMIC); + if (NULL == sqcp->cmnd_timerp) + return SCSI_MLQUEUE_HOST_BUSY; + init_timer(sqcp->cmnd_timerp); + } + sqcp->cmnd_timerp->function = sdebug_q_cmd_complete; + sqcp->cmnd_timerp->data = k; + sqcp->cmnd_timerp->expires = get_jiffies_64() + delta_jiff; + add_timer(sqcp->cmnd_timerp); + } else if (scsi_debug_ndelay > 0) { + ktime_t kt = ktime_set(0, scsi_debug_ndelay); + struct sdebug_hrtimer *sd_hp = sqcp->sd_hrtp; + + if (NULL == sd_hp) { + sd_hp = kmalloc(sizeof(*sd_hp), GFP_ATOMIC); + if (NULL == sd_hp) + return SCSI_MLQUEUE_HOST_BUSY; + sqcp->sd_hrtp = sd_hp; + hrtimer_init(&sd_hp->hrt, CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + sd_hp->hrt.function = sdebug_q_cmd_hrt_complete; + sd_hp->qa_indx = k; + } + hrtimer_start(&sd_hp->hrt, kt, HRTIMER_MODE_REL); + } else { /* delay < 0 */ + if (NULL == sqcp->tletp) { + sqcp->tletp = kmalloc(sizeof(*sqcp->tletp), + GFP_ATOMIC); + if (NULL == sqcp->tletp) + return SCSI_MLQUEUE_HOST_BUSY; + tasklet_init(sqcp->tletp, + sdebug_q_cmd_complete, k); + } + if (-1 == delta_jiff) + tasklet_hi_schedule(sqcp->tletp); + else + tasklet_schedule(sqcp->tletp); + } + if ((SCSI_DEBUG_OPT_Q_NOISE & scsi_debug_opts) && + (scsi_result == device_qfull_result)) + sdev_printk(KERN_INFO, sdp, + "%s: num_in_q=%d +1, %s%s\n", __func__, + num_in_q, (inject ? "<inject> " : ""), + "status: TASK SET FULL"); + return 0; + +respond_in_thread: /* call back to mid-layer using invocation thread */ + cmnd->result = scsi_result; + cmnd->scsi_done(cmnd); + return 0; +} + +/* Note: The following macros create attribute files in the + /sys/module/scsi_debug/parameters directory. Unfortunately this + driver is unaware of a change and cannot trigger auxiliary actions + as it can when the corresponding attribute in the + /sys/bus/pseudo/drivers/scsi_debug directory is changed. + */ +module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR); +module_param_named(ato, scsi_debug_ato, int, S_IRUGO); +module_param_named(clustering, scsi_debug_clustering, bool, S_IRUGO | S_IWUSR); +module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR); +module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO); +module_param_named(dif, scsi_debug_dif, int, S_IRUGO); +module_param_named(dix, scsi_debug_dix, int, S_IRUGO); +module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR); +module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR); +module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR); +module_param_named(guard, scsi_debug_guard, uint, S_IRUGO); +module_param_named(host_lock, scsi_debug_host_lock, bool, S_IRUGO | S_IWUSR); +module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO); +module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO); +module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO); +module_param_named(lbprz, scsi_debug_lbprz, int, S_IRUGO); +module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO); +module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR); +module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR); +module_param_named(ndelay, scsi_debug_ndelay, int, S_IRUGO | S_IWUSR); +module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR); +module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO); +module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO); +module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR); +module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO); +module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR); +module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO); +module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR); +module_param_named(removable, scsi_debug_removable, bool, S_IRUGO | S_IWUSR); +module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO); +module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO); +module_param_named(strict, scsi_debug_strict, bool, S_IRUGO | S_IWUSR); +module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO); +module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO); +module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO); +module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO); +module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR); +module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int, + S_IRUGO | S_IWUSR); +module_param_named(write_same_length, scsi_debug_write_same_length, int, + S_IRUGO | S_IWUSR); + +MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert"); +MODULE_DESCRIPTION("SCSI debug adapter driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(SCSI_DEBUG_VERSION); + +MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)"); +MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)"); +MODULE_PARM_DESC(clustering, "when set enables larger transfers (def=0)"); +MODULE_PARM_DESC(delay, "response delay (def=1 jiffy); 0:imm, -1,-2:tiny"); +MODULE_PARM_DESC(dev_size_mb, "size in MiB of ram shared by devs(def=8)"); +MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)"); +MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)"); +MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)"); +MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)"); +MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)"); +MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)"); +MODULE_PARM_DESC(host_lock, "use host_lock around all commands (def=0)"); +MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)"); +MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)"); +MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)"); +MODULE_PARM_DESC(lbprz, "unmapped blocks return 0 on read (def=1)"); +MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)"); +MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)"); +MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to max(def))"); +MODULE_PARM_DESC(ndelay, "response delay in nanoseconds (def=0 -> ignore)"); +MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)"); +MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))"); +MODULE_PARM_DESC(num_parts, "number of partitions(def=0)"); +MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)"); +MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)"); +MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)"); +MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)"); +MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])"); +MODULE_PARM_DESC(removable, "claim to have removable media (def=0)"); +MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=6[SPC-4])"); +MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)"); +MODULE_PARM_DESC(strict, "stricter checks: reserved field in cdb (def=0)"); +MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)"); +MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)"); +MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)"); +MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)"); +MODULE_PARM_DESC(virtual_gb, "virtual gigabyte (GiB) size (def=0 -> use dev_size_mb)"); +MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)"); +MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)"); + +static char sdebug_info[256]; + +static const char * scsi_debug_info(struct Scsi_Host * shp) +{ + sprintf(sdebug_info, "scsi_debug, version %s [%s], " + "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION, + scsi_debug_version_date, scsi_debug_dev_size_mb, + scsi_debug_opts); + return sdebug_info; +} + +/* 'echo <val> > /proc/scsi/scsi_debug/<host_id>' writes to opts */ +static int scsi_debug_write_info(struct Scsi_Host *host, char *buffer, int length) +{ + char arr[16]; + int opts; + int minLen = length > 15 ? 15 : length; + + if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) + return -EACCES; + memcpy(arr, buffer, minLen); + arr[minLen] = '\0'; + if (1 != sscanf(arr, "%d", &opts)) + return -EINVAL; + scsi_debug_opts = opts; + if (scsi_debug_every_nth != 0) + atomic_set(&sdebug_cmnd_count, 0); + return length; +} + +/* Output seen with 'cat /proc/scsi/scsi_debug/<host_id>'. It will be the + * same for each scsi_debug host (if more than one). Some of the counters + * output are not atomics so might be inaccurate in a busy system. */ +static int scsi_debug_show_info(struct seq_file *m, struct Scsi_Host *host) +{ + int f, l; + char b[32]; + + if (scsi_debug_every_nth > 0) + snprintf(b, sizeof(b), " (curr:%d)", + ((SCSI_DEBUG_OPT_RARE_TSF & scsi_debug_opts) ? + atomic_read(&sdebug_a_tsf) : + atomic_read(&sdebug_cmnd_count))); + else + b[0] = '\0'; + + seq_printf(m, "scsi_debug adapter driver, version %s [%s]\n" + "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, " + "every_nth=%d%s\n" + "delay=%d, ndelay=%d, max_luns=%d, q_completions=%d\n" + "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n" + "command aborts=%d; RESETs: device=%d, target=%d, bus=%d, " + "host=%d\ndix_reads=%d dix_writes=%d dif_errors=%d " + "usec_in_jiffy=%lu\n", + SCSI_DEBUG_VERSION, scsi_debug_version_date, + scsi_debug_num_tgts, scsi_debug_dev_size_mb, scsi_debug_opts, + scsi_debug_every_nth, b, scsi_debug_delay, scsi_debug_ndelay, + scsi_debug_max_luns, atomic_read(&sdebug_completions), + scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads, + sdebug_sectors_per, num_aborts, num_dev_resets, + num_target_resets, num_bus_resets, num_host_resets, + dix_reads, dix_writes, dif_errors, TICK_NSEC / 1000); + + f = find_first_bit(queued_in_use_bm, scsi_debug_max_queue); + if (f != scsi_debug_max_queue) { + l = find_last_bit(queued_in_use_bm, scsi_debug_max_queue); + seq_printf(m, " %s BUSY: first,last bits set: %d,%d\n", + "queued_in_use_bm", f, l); + } + return 0; +} + +static ssize_t delay_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay); +} +/* Returns -EBUSY if delay is being changed and commands are queued */ +static ssize_t delay_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int delay, res; + + if ((count > 0) && (1 == sscanf(buf, "%d", &delay))) { + res = count; + if (scsi_debug_delay != delay) { + unsigned long iflags; + int k; + + spin_lock_irqsave(&queued_arr_lock, iflags); + k = find_first_bit(queued_in_use_bm, + scsi_debug_max_queue); + if (k != scsi_debug_max_queue) + res = -EBUSY; /* have queued commands */ + else { + scsi_debug_delay = delay; + scsi_debug_ndelay = 0; + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); + } + return res; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(delay); + +static ssize_t ndelay_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ndelay); +} +/* Returns -EBUSY if ndelay is being changed and commands are queued */ +/* If > 0 and accepted then scsi_debug_delay is set to DELAY_OVERRIDDEN */ +static ssize_t ndelay_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + unsigned long iflags; + int ndelay, res, k; + + if ((count > 0) && (1 == sscanf(buf, "%d", &ndelay)) && + (ndelay >= 0) && (ndelay < 1000000000)) { + res = count; + if (scsi_debug_ndelay != ndelay) { + spin_lock_irqsave(&queued_arr_lock, iflags); + k = find_first_bit(queued_in_use_bm, + scsi_debug_max_queue); + if (k != scsi_debug_max_queue) + res = -EBUSY; /* have queued commands */ + else { + scsi_debug_ndelay = ndelay; + scsi_debug_delay = ndelay ? DELAY_OVERRIDDEN + : DEF_DELAY; + } + spin_unlock_irqrestore(&queued_arr_lock, iflags); + } + return res; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(ndelay); + +static ssize_t opts_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts); +} + +static ssize_t opts_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int opts; + char work[20]; + + if (1 == sscanf(buf, "%10s", work)) { + if (0 == strncasecmp(work,"0x", 2)) { + if (1 == sscanf(&work[2], "%x", &opts)) + goto opts_done; + } else { + if (1 == sscanf(work, "%d", &opts)) + goto opts_done; + } + } + return -EINVAL; +opts_done: + scsi_debug_opts = opts; + if (SCSI_DEBUG_OPT_RECOVERED_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_DIF_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_DIX_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_SHORT_TRANSFER & opts) + sdebug_any_injecting_opt = true; + atomic_set(&sdebug_cmnd_count, 0); + atomic_set(&sdebug_a_tsf, 0); + return count; +} +static DRIVER_ATTR_RW(opts); + +static ssize_t ptype_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype); +} +static ssize_t ptype_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_ptype = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(ptype); + +static ssize_t dsense_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense); +} +static ssize_t dsense_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_dsense = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(dsense); + +static ssize_t fake_rw_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw); +} +static ssize_t fake_rw_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + n = (n > 0); + scsi_debug_fake_rw = (scsi_debug_fake_rw > 0); + if (scsi_debug_fake_rw != n) { + if ((0 == n) && (NULL == fake_storep)) { + unsigned long sz = + (unsigned long)scsi_debug_dev_size_mb * + 1048576; + + fake_storep = vmalloc(sz); + if (NULL == fake_storep) { + pr_err("%s: out of memory, 9\n", + __func__); + return -ENOMEM; + } + memset(fake_storep, 0, sz); + } + scsi_debug_fake_rw = n; + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(fake_rw); + +static ssize_t no_lun_0_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0); +} +static ssize_t no_lun_0_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_no_lun_0 = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(no_lun_0); + +static ssize_t num_tgts_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts); +} +static ssize_t num_tgts_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_num_tgts = n; + sdebug_max_tgts_luns(); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(num_tgts); + +static ssize_t dev_size_mb_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb); +} +static DRIVER_ATTR_RO(dev_size_mb); + +static ssize_t num_parts_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts); +} +static DRIVER_ATTR_RO(num_parts); + +static ssize_t every_nth_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth); +} +static ssize_t every_nth_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int nth; + + if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) { + scsi_debug_every_nth = nth; + atomic_set(&sdebug_cmnd_count, 0); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(every_nth); + +static ssize_t max_luns_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns); +} +static ssize_t max_luns_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + bool changed; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + changed = (scsi_debug_max_luns != n); + scsi_debug_max_luns = n; + sdebug_max_tgts_luns(); + if (changed && (scsi_debug_scsi_level >= 5)) { /* >= SPC-3 */ + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, + host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_LUNS_CHANGED, + dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(max_luns); + +static ssize_t max_queue_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue); +} +/* N.B. max_queue can be changed while there are queued commands. In flight + * commands beyond the new max_queue will be completed. */ +static ssize_t max_queue_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + unsigned long iflags; + int n, k; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) && + (n <= SCSI_DEBUG_CANQUEUE)) { + spin_lock_irqsave(&queued_arr_lock, iflags); + k = find_last_bit(queued_in_use_bm, SCSI_DEBUG_CANQUEUE); + scsi_debug_max_queue = n; + if (SCSI_DEBUG_CANQUEUE == k) + atomic_set(&retired_max_queue, 0); + else if (k >= n) + atomic_set(&retired_max_queue, k + 1); + else + atomic_set(&retired_max_queue, 0); + spin_unlock_irqrestore(&queued_arr_lock, iflags); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(max_queue); + +static ssize_t no_uld_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld); +} +static DRIVER_ATTR_RO(no_uld); + +static ssize_t scsi_level_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level); +} +static DRIVER_ATTR_RO(scsi_level); + +static ssize_t virtual_gb_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb); +} +static ssize_t virtual_gb_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + bool changed; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + changed = (scsi_debug_virtual_gb != n); + scsi_debug_virtual_gb = n; + sdebug_capacity = get_sdebug_capacity(); + if (changed) { + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, + host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_CAPACITY_CHANGED, + dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(virtual_gb); + +static ssize_t add_host_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host); +} + +static ssize_t add_host_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int delta_hosts; + + if (sscanf(buf, "%d", &delta_hosts) != 1) + return -EINVAL; + if (delta_hosts > 0) { + do { + sdebug_add_adapter(); + } while (--delta_hosts); + } else if (delta_hosts < 0) { + do { + sdebug_remove_adapter(); + } while (++delta_hosts); + } + return count; +} +static DRIVER_ATTR_RW(add_host); + +static ssize_t vpd_use_hostno_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno); +} +static ssize_t vpd_use_hostno_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_vpd_use_hostno = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(vpd_use_hostno); + +static ssize_t sector_size_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size); +} +static DRIVER_ATTR_RO(sector_size); + +static ssize_t dix_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix); +} +static DRIVER_ATTR_RO(dix); + +static ssize_t dif_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif); +} +static DRIVER_ATTR_RO(dif); + +static ssize_t guard_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_guard); +} +static DRIVER_ATTR_RO(guard); + +static ssize_t ato_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato); +} +static DRIVER_ATTR_RO(ato); + +static ssize_t map_show(struct device_driver *ddp, char *buf) +{ + ssize_t count; + + if (!scsi_debug_lbp()) + return scnprintf(buf, PAGE_SIZE, "0-%u\n", + sdebug_store_sectors); + + count = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", + (int)map_size, map_storep); + buf[count++] = '\n'; + buf[count] = '\0'; + + return count; +} +static DRIVER_ATTR_RO(map); + +static ssize_t removable_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_removable ? 1 : 0); +} +static ssize_t removable_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_removable = (n > 0); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(removable); + +static ssize_t host_lock_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", !!scsi_debug_host_lock); +} +/* Returns -EBUSY if host_lock is being changed and commands are queued */ +static ssize_t host_lock_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n, res; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + bool new_host_lock = (n > 0); + + res = count; + if (new_host_lock != scsi_debug_host_lock) { + unsigned long iflags; + int k; + + spin_lock_irqsave(&queued_arr_lock, iflags); + k = find_first_bit(queued_in_use_bm, + scsi_debug_max_queue); + if (k != scsi_debug_max_queue) + res = -EBUSY; /* have queued commands */ + else + scsi_debug_host_lock = new_host_lock; + spin_unlock_irqrestore(&queued_arr_lock, iflags); + } + return res; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(host_lock); + +static ssize_t strict_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", !!scsi_debug_strict); +} +static ssize_t strict_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + scsi_debug_strict = (n > 0); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(strict); + + +/* Note: The following array creates attribute files in the + /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these + files (over those found in the /sys/module/scsi_debug/parameters + directory) is that auxiliary actions can be triggered when an attribute + is changed. For example see: sdebug_add_host_store() above. + */ + +static struct attribute *sdebug_drv_attrs[] = { + &driver_attr_delay.attr, + &driver_attr_opts.attr, + &driver_attr_ptype.attr, + &driver_attr_dsense.attr, + &driver_attr_fake_rw.attr, + &driver_attr_no_lun_0.attr, + &driver_attr_num_tgts.attr, + &driver_attr_dev_size_mb.attr, + &driver_attr_num_parts.attr, + &driver_attr_every_nth.attr, + &driver_attr_max_luns.attr, + &driver_attr_max_queue.attr, + &driver_attr_no_uld.attr, + &driver_attr_scsi_level.attr, + &driver_attr_virtual_gb.attr, + &driver_attr_add_host.attr, + &driver_attr_vpd_use_hostno.attr, + &driver_attr_sector_size.attr, + &driver_attr_dix.attr, + &driver_attr_dif.attr, + &driver_attr_guard.attr, + &driver_attr_ato.attr, + &driver_attr_map.attr, + &driver_attr_removable.attr, + &driver_attr_host_lock.attr, + &driver_attr_ndelay.attr, + &driver_attr_strict.attr, + NULL, +}; +ATTRIBUTE_GROUPS(sdebug_drv); + +static struct device *pseudo_primary; + +static int __init scsi_debug_init(void) +{ + unsigned long sz; + int host_to_add; + int k; + int ret; + + atomic_set(&sdebug_cmnd_count, 0); + atomic_set(&sdebug_completions, 0); + atomic_set(&retired_max_queue, 0); + + if (scsi_debug_ndelay >= 1000000000) { + pr_warn("%s: ndelay must be less than 1 second, ignored\n", + __func__); + scsi_debug_ndelay = 0; + } else if (scsi_debug_ndelay > 0) + scsi_debug_delay = DELAY_OVERRIDDEN; + + switch (scsi_debug_sector_size) { + case 512: + case 1024: + case 2048: + case 4096: + break; + default: + pr_err("%s: invalid sector_size %d\n", __func__, + scsi_debug_sector_size); + return -EINVAL; + } + + switch (scsi_debug_dif) { + + case SD_DIF_TYPE0_PROTECTION: + case SD_DIF_TYPE1_PROTECTION: + case SD_DIF_TYPE2_PROTECTION: + case SD_DIF_TYPE3_PROTECTION: + break; + + default: + pr_err("%s: dif must be 0, 1, 2 or 3\n", __func__); + return -EINVAL; + } + + if (scsi_debug_guard > 1) { + pr_err("%s: guard must be 0 or 1\n", __func__); + return -EINVAL; + } + + if (scsi_debug_ato > 1) { + pr_err("%s: ato must be 0 or 1\n", __func__); + return -EINVAL; + } + + if (scsi_debug_physblk_exp > 15) { + pr_err("%s: invalid physblk_exp %u\n", __func__, + scsi_debug_physblk_exp); + return -EINVAL; + } + + if (scsi_debug_lowest_aligned > 0x3fff) { + pr_err("%s: lowest_aligned too big: %u\n", __func__, + scsi_debug_lowest_aligned); + return -EINVAL; + } + + if (scsi_debug_dev_size_mb < 1) + scsi_debug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */ + sz = (unsigned long)scsi_debug_dev_size_mb * 1048576; + sdebug_store_sectors = sz / scsi_debug_sector_size; + sdebug_capacity = get_sdebug_capacity(); + + /* play around with geometry, don't waste too much on track 0 */ + sdebug_heads = 8; + sdebug_sectors_per = 32; + if (scsi_debug_dev_size_mb >= 16) + sdebug_heads = 32; + else if (scsi_debug_dev_size_mb >= 256) + sdebug_heads = 64; + sdebug_cylinders_per = (unsigned long)sdebug_capacity / + (sdebug_sectors_per * sdebug_heads); + if (sdebug_cylinders_per >= 1024) { + /* other LLDs do this; implies >= 1GB ram disk ... */ + sdebug_heads = 255; + sdebug_sectors_per = 63; + sdebug_cylinders_per = (unsigned long)sdebug_capacity / + (sdebug_sectors_per * sdebug_heads); + } + + if (0 == scsi_debug_fake_rw) { + fake_storep = vmalloc(sz); + if (NULL == fake_storep) { + pr_err("%s: out of memory, 1\n", __func__); + return -ENOMEM; + } + memset(fake_storep, 0, sz); + if (scsi_debug_num_parts > 0) + sdebug_build_parts(fake_storep, sz); + } + + if (scsi_debug_dix) { + int dif_size; + + dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple); + dif_storep = vmalloc(dif_size); + + pr_err("%s: dif_storep %u bytes @ %p\n", __func__, dif_size, + dif_storep); + + if (dif_storep == NULL) { + pr_err("%s: out of mem. (DIX)\n", __func__); + ret = -ENOMEM; + goto free_vm; + } + + memset(dif_storep, 0xff, dif_size); + } + + /* Logical Block Provisioning */ + if (scsi_debug_lbp()) { + scsi_debug_unmap_max_blocks = + clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU); + + scsi_debug_unmap_max_desc = + clamp(scsi_debug_unmap_max_desc, 0U, 256U); + + scsi_debug_unmap_granularity = + clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU); + + if (scsi_debug_unmap_alignment && + scsi_debug_unmap_granularity <= + scsi_debug_unmap_alignment) { + pr_err("%s: ERR: unmap_granularity <= unmap_alignment\n", + __func__); + return -EINVAL; + } + + map_size = lba_to_map_index(sdebug_store_sectors - 1) + 1; + map_storep = vmalloc(BITS_TO_LONGS(map_size) * sizeof(long)); + + pr_info("%s: %lu provisioning blocks\n", __func__, map_size); + + if (map_storep == NULL) { + pr_err("%s: out of mem. (MAP)\n", __func__); + ret = -ENOMEM; + goto free_vm; + } + + bitmap_zero(map_storep, map_size); + + /* Map first 1KB for partition table */ + if (scsi_debug_num_parts) + map_region(0, 2); + } + + pseudo_primary = root_device_register("pseudo_0"); + if (IS_ERR(pseudo_primary)) { + pr_warn("%s: root_device_register() error\n", __func__); + ret = PTR_ERR(pseudo_primary); + goto free_vm; + } + ret = bus_register(&pseudo_lld_bus); + if (ret < 0) { + pr_warn("%s: bus_register error: %d\n", __func__, ret); + goto dev_unreg; + } + ret = driver_register(&sdebug_driverfs_driver); + if (ret < 0) { + pr_warn("%s: driver_register error: %d\n", __func__, ret); + goto bus_unreg; + } + + host_to_add = scsi_debug_add_host; + scsi_debug_add_host = 0; + + for (k = 0; k < host_to_add; k++) { + if (sdebug_add_adapter()) { + pr_err("%s: sdebug_add_adapter failed k=%d\n", + __func__, k); + break; + } + } + + if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) { + pr_info("%s: built %d host(s)\n", __func__, + scsi_debug_add_host); + } + return 0; + +bus_unreg: + bus_unregister(&pseudo_lld_bus); +dev_unreg: + root_device_unregister(pseudo_primary); +free_vm: + if (map_storep) + vfree(map_storep); + if (dif_storep) + vfree(dif_storep); + vfree(fake_storep); + + return ret; +} + +static void __exit scsi_debug_exit(void) +{ + int k = scsi_debug_add_host; + + stop_all_queued(); + free_all_queued(); + for (; k; k--) + sdebug_remove_adapter(); + driver_unregister(&sdebug_driverfs_driver); + bus_unregister(&pseudo_lld_bus); + root_device_unregister(pseudo_primary); + + if (dif_storep) + vfree(dif_storep); + + vfree(fake_storep); +} + +device_initcall(scsi_debug_init); +module_exit(scsi_debug_exit); + +static void sdebug_release_adapter(struct device * dev) +{ + struct sdebug_host_info *sdbg_host; + + sdbg_host = to_sdebug_host(dev); + kfree(sdbg_host); +} + +static int sdebug_add_adapter(void) +{ + int k, devs_per_host; + int error = 0; + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *sdbg_devinfo, *tmp; + + sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL); + if (NULL == sdbg_host) { + printk(KERN_ERR "%s: out of memory at line %d\n", + __func__, __LINE__); + return -ENOMEM; + } + + INIT_LIST_HEAD(&sdbg_host->dev_info_list); + + devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns; + for (k = 0; k < devs_per_host; k++) { + sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL); + if (!sdbg_devinfo) { + printk(KERN_ERR "%s: out of memory at line %d\n", + __func__, __LINE__); + error = -ENOMEM; + goto clean; + } + } + + spin_lock(&sdebug_host_list_lock); + list_add_tail(&sdbg_host->host_list, &sdebug_host_list); + spin_unlock(&sdebug_host_list_lock); + + sdbg_host->dev.bus = &pseudo_lld_bus; + sdbg_host->dev.parent = pseudo_primary; + sdbg_host->dev.release = &sdebug_release_adapter; + dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host); + + error = device_register(&sdbg_host->dev); + + if (error) + goto clean; + + ++scsi_debug_add_host; + return error; + +clean: + list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list, + dev_list) { + list_del(&sdbg_devinfo->dev_list); + kfree(sdbg_devinfo); + } + + kfree(sdbg_host); + return error; +} + +static void sdebug_remove_adapter(void) +{ + struct sdebug_host_info * sdbg_host = NULL; + + spin_lock(&sdebug_host_list_lock); + if (!list_empty(&sdebug_host_list)) { + sdbg_host = list_entry(sdebug_host_list.prev, + struct sdebug_host_info, host_list); + list_del(&sdbg_host->host_list); + } + spin_unlock(&sdebug_host_list_lock); + + if (!sdbg_host) + return; + + device_unregister(&sdbg_host->dev); + --scsi_debug_add_host; +} + +static int +sdebug_change_qdepth(struct scsi_device *sdev, int qdepth) +{ + int num_in_q = 0; + unsigned long iflags; + struct sdebug_dev_info *devip; + + spin_lock_irqsave(&queued_arr_lock, iflags); + devip = (struct sdebug_dev_info *)sdev->hostdata; + if (NULL == devip) { + spin_unlock_irqrestore(&queued_arr_lock, iflags); + return -ENODEV; + } + num_in_q = atomic_read(&devip->num_in_q); + spin_unlock_irqrestore(&queued_arr_lock, iflags); + + if (qdepth < 1) + qdepth = 1; + /* allow to exceed max host queued_arr elements for testing */ + if (qdepth > SCSI_DEBUG_CANQUEUE + 10) + qdepth = SCSI_DEBUG_CANQUEUE + 10; + scsi_change_queue_depth(sdev, qdepth); + + if (SCSI_DEBUG_OPT_Q_NOISE & scsi_debug_opts) { + sdev_printk(KERN_INFO, sdev, + "%s: qdepth=%d, num_in_q=%d\n", + __func__, qdepth, num_in_q); + } + return sdev->queue_depth; +} + +static int +check_inject(struct scsi_cmnd *scp) +{ + struct sdebug_scmd_extra_t *ep = scsi_cmd_priv(scp); + + memset(ep, 0, sizeof(struct sdebug_scmd_extra_t)); + + if (atomic_inc_return(&sdebug_cmnd_count) >= + abs(scsi_debug_every_nth)) { + atomic_set(&sdebug_cmnd_count, 0); + if (scsi_debug_every_nth < -1) + scsi_debug_every_nth = -1; + if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts) + return 1; /* ignore command causing timeout */ + else if (SCSI_DEBUG_OPT_MAC_TIMEOUT & scsi_debug_opts && + scsi_medium_access_command(scp)) + return 1; /* time out reads and writes */ + if (sdebug_any_injecting_opt) { + int opts = scsi_debug_opts; + + if (SCSI_DEBUG_OPT_RECOVERED_ERR & opts) + ep->inj_recovered = true; + else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & opts) + ep->inj_transport = true; + else if (SCSI_DEBUG_OPT_DIF_ERR & opts) + ep->inj_dif = true; + else if (SCSI_DEBUG_OPT_DIX_ERR & opts) + ep->inj_dix = true; + else if (SCSI_DEBUG_OPT_SHORT_TRANSFER & opts) + ep->inj_short = true; + } + } + return 0; +} + +static int +scsi_debug_queuecommand(struct scsi_cmnd *scp) +{ + u8 sdeb_i; + struct scsi_device *sdp = scp->device; + const struct opcode_info_t *oip; + const struct opcode_info_t *r_oip; + struct sdebug_dev_info *devip; + u8 *cmd = scp->cmnd; + int (*r_pfp)(struct scsi_cmnd *, struct sdebug_dev_info *); + int k, na; + int errsts = 0; + int errsts_no_connect = DID_NO_CONNECT << 16; + u32 flags; + u16 sa; + u8 opcode = cmd[0]; + bool has_wlun_rl; + bool debug = !!(SCSI_DEBUG_OPT_NOISE & scsi_debug_opts); + + scsi_set_resid(scp, 0); + if (debug && !(SCSI_DEBUG_OPT_NO_CDB_NOISE & scsi_debug_opts)) { + char b[120]; + int n, len, sb; + + len = scp->cmd_len; + sb = (int)sizeof(b); + if (len > 32) + strcpy(b, "too long, over 32 bytes"); + else { + for (k = 0, n = 0; k < len && n < sb; ++k) + n += scnprintf(b + n, sb - n, "%02x ", + (u32)cmd[k]); + } + sdev_printk(KERN_INFO, sdp, "%s: cmd %s\n", my_name, b); + } + has_wlun_rl = (sdp->lun == SAM2_WLUN_REPORT_LUNS); + if ((sdp->lun >= scsi_debug_max_luns) && !has_wlun_rl) + return schedule_resp(scp, NULL, errsts_no_connect, 0); + + sdeb_i = opcode_ind_arr[opcode]; /* fully mapped */ + oip = &opcode_info_arr[sdeb_i]; /* safe if table consistent */ + devip = (struct sdebug_dev_info *)sdp->hostdata; + if (!devip) { + devip = devInfoReg(sdp); + if (NULL == devip) + return schedule_resp(scp, NULL, errsts_no_connect, 0); + } + na = oip->num_attached; + r_pfp = oip->pfp; + if (na) { /* multiple commands with this opcode */ + r_oip = oip; + if (FF_SA & r_oip->flags) { + if (F_SA_LOW & oip->flags) + sa = 0x1f & cmd[1]; + else + sa = get_unaligned_be16(cmd + 8); + for (k = 0; k <= na; oip = r_oip->arrp + k++) { + if (opcode == oip->opcode && sa == oip->sa) + break; + } + } else { /* since no service action only check opcode */ + for (k = 0; k <= na; oip = r_oip->arrp + k++) { + if (opcode == oip->opcode) + break; + } + } + if (k > na) { + if (F_SA_LOW & r_oip->flags) + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 4); + else if (F_SA_HIGH & r_oip->flags) + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 8, 7); + else + mk_sense_invalid_opcode(scp); + goto check_cond; + } + } /* else (when na==0) we assume the oip is a match */ + flags = oip->flags; + if (F_INV_OP & flags) { + mk_sense_invalid_opcode(scp); + goto check_cond; + } + if (has_wlun_rl && !(F_RL_WLUN_OK & flags)) { + if (debug) + sdev_printk(KERN_INFO, sdp, "scsi_debug: Opcode: " + "0x%x not supported for wlun\n", opcode); + mk_sense_invalid_opcode(scp); + goto check_cond; + } + if (scsi_debug_strict) { /* check cdb against mask */ + u8 rem; + int j; + + for (k = 1; k < oip->len_mask[0] && k < 16; ++k) { + rem = ~oip->len_mask[k] & cmd[k]; + if (rem) { + for (j = 7; j >= 0; --j, rem <<= 1) { + if (0x80 & rem) + break; + } + mk_sense_invalid_fld(scp, SDEB_IN_CDB, k, j); + goto check_cond; + } + } + } + if (!(F_SKIP_UA & flags) && + SDEBUG_NUM_UAS != find_first_bit(devip->uas_bm, SDEBUG_NUM_UAS)) { + errsts = check_readiness(scp, UAS_ONLY, devip); + if (errsts) + goto check_cond; + } + if ((F_M_ACCESS & flags) && devip->stopped) { + mk_sense_buffer(scp, NOT_READY, LOGICAL_UNIT_NOT_READY, 0x2); + if (debug) + sdev_printk(KERN_INFO, sdp, "%s reports: Not ready: " + "%s\n", my_name, "initializing command " + "required"); + errsts = check_condition_result; + goto fini; + } + if (scsi_debug_fake_rw && (F_FAKE_RW & flags)) + goto fini; + if (scsi_debug_every_nth) { + if (check_inject(scp)) + return 0; /* ignore command: make trouble */ + } + if (oip->pfp) /* if this command has a resp_* function, call it */ + errsts = oip->pfp(scp, devip); + else if (r_pfp) /* if leaf function ptr NULL, try the root's */ + errsts = r_pfp(scp, devip); + +fini: + return schedule_resp(scp, devip, errsts, + ((F_DELAY_OVERR & flags) ? 0 : scsi_debug_delay)); +check_cond: + return schedule_resp(scp, devip, check_condition_result, 0); +} + +static int +sdebug_queuecommand_lock_or_not(struct Scsi_Host *shost, struct scsi_cmnd *cmd) +{ + if (scsi_debug_host_lock) { + unsigned long iflags; + int rc; + + spin_lock_irqsave(shost->host_lock, iflags); + rc = scsi_debug_queuecommand(cmd); + spin_unlock_irqrestore(shost->host_lock, iflags); + return rc; + } else + return scsi_debug_queuecommand(cmd); +} + +static struct scsi_host_template sdebug_driver_template = { + .show_info = scsi_debug_show_info, + .write_info = scsi_debug_write_info, + .proc_name = sdebug_proc_name, + .name = "SCSI DEBUG", + .info = scsi_debug_info, + .slave_alloc = scsi_debug_slave_alloc, + .slave_configure = scsi_debug_slave_configure, + .slave_destroy = scsi_debug_slave_destroy, + .ioctl = scsi_debug_ioctl, + .queuecommand = sdebug_queuecommand_lock_or_not, + .change_queue_depth = sdebug_change_qdepth, + .eh_abort_handler = scsi_debug_abort, + .eh_device_reset_handler = scsi_debug_device_reset, + .eh_target_reset_handler = scsi_debug_target_reset, + .eh_bus_reset_handler = scsi_debug_bus_reset, + .eh_host_reset_handler = scsi_debug_host_reset, + .can_queue = SCSI_DEBUG_CANQUEUE, + .this_id = 7, + .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS, + .cmd_per_lun = DEF_CMD_PER_LUN, + .max_sectors = -1U, + .use_clustering = DISABLE_CLUSTERING, + .module = THIS_MODULE, + .track_queue_depth = 1, + .cmd_size = sizeof(struct sdebug_scmd_extra_t), +}; + +static int sdebug_driver_probe(struct device * dev) +{ + int error = 0; + int opts; + struct sdebug_host_info *sdbg_host; + struct Scsi_Host *hpnt; + int host_prot; + + sdbg_host = to_sdebug_host(dev); + + sdebug_driver_template.can_queue = scsi_debug_max_queue; + if (scsi_debug_clustering) + sdebug_driver_template.use_clustering = ENABLE_CLUSTERING; + hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host)); + if (NULL == hpnt) { + pr_err("%s: scsi_host_alloc failed\n", __func__); + error = -ENODEV; + return error; + } + + sdbg_host->shost = hpnt; + *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; + if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id)) + hpnt->max_id = scsi_debug_num_tgts + 1; + else + hpnt->max_id = scsi_debug_num_tgts; + hpnt->max_lun = SAM2_WLUN_REPORT_LUNS; /* = scsi_debug_max_luns; */ + + host_prot = 0; + + switch (scsi_debug_dif) { + + case SD_DIF_TYPE1_PROTECTION: + host_prot = SHOST_DIF_TYPE1_PROTECTION; + if (scsi_debug_dix) + host_prot |= SHOST_DIX_TYPE1_PROTECTION; + break; + + case SD_DIF_TYPE2_PROTECTION: + host_prot = SHOST_DIF_TYPE2_PROTECTION; + if (scsi_debug_dix) + host_prot |= SHOST_DIX_TYPE2_PROTECTION; + break; + + case SD_DIF_TYPE3_PROTECTION: + host_prot = SHOST_DIF_TYPE3_PROTECTION; + if (scsi_debug_dix) + host_prot |= SHOST_DIX_TYPE3_PROTECTION; + break; + + default: + if (scsi_debug_dix) + host_prot |= SHOST_DIX_TYPE0_PROTECTION; + break; + } + + scsi_host_set_prot(hpnt, host_prot); + + printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n", + (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "", + (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "", + (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "", + (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "", + (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "", + (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "", + (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : ""); + + if (scsi_debug_guard == 1) + scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP); + else + scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC); + + opts = scsi_debug_opts; + if (SCSI_DEBUG_OPT_RECOVERED_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_DIF_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_DIX_ERR & opts) + sdebug_any_injecting_opt = true; + else if (SCSI_DEBUG_OPT_SHORT_TRANSFER & opts) + sdebug_any_injecting_opt = true; + + error = scsi_add_host(hpnt, &sdbg_host->dev); + if (error) { + printk(KERN_ERR "%s: scsi_add_host failed\n", __func__); + error = -ENODEV; + scsi_host_put(hpnt); + } else + scsi_scan_host(hpnt); + + return error; +} + +static int sdebug_driver_remove(struct device * dev) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *sdbg_devinfo, *tmp; + + sdbg_host = to_sdebug_host(dev); + + if (!sdbg_host) { + printk(KERN_ERR "%s: Unable to locate host info\n", + __func__); + return -ENODEV; + } + + scsi_remove_host(sdbg_host->shost); + + list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list, + dev_list) { + list_del(&sdbg_devinfo->dev_list); + kfree(sdbg_devinfo); + } + + scsi_host_put(sdbg_host->shost); + return 0; +} + +static int pseudo_lld_bus_match(struct device *dev, + struct device_driver *dev_driver) +{ + return 1; +} + +static struct bus_type pseudo_lld_bus = { + .name = "pseudo", + .match = pseudo_lld_bus_match, + .probe = sdebug_driver_probe, + .remove = sdebug_driver_remove, + .drv_groups = sdebug_drv_groups, +}; |