diff options
author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/hw/scsi/scsi-generic.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/hw/scsi/scsi-generic.c')
-rw-r--r-- | qemu/hw/scsi/scsi-generic.c | 496 |
1 files changed, 496 insertions, 0 deletions
diff --git a/qemu/hw/scsi/scsi-generic.c b/qemu/hw/scsi/scsi-generic.c new file mode 100644 index 000000000..e53470f85 --- /dev/null +++ b/qemu/hw/scsi/scsi-generic.c @@ -0,0 +1,496 @@ +/* + * Generic SCSI Device support + * + * Copyright (c) 2007 Bull S.A.S. + * Based on code by Paul Brook + * Based on code by Fabrice Bellard + * + * Written by Laurent Vivier <Laurent.Vivier@bull.net> + * + * This code is licensed under the LGPL. + * + */ + +#include "qemu-common.h" +#include "qemu/error-report.h" +#include "hw/scsi/scsi.h" +#include "sysemu/block-backend.h" +#include "sysemu/blockdev.h" + +#ifdef __linux__ + +//#define DEBUG_SCSI + +#ifdef DEBUG_SCSI +#define DPRINTF(fmt, ...) \ +do { printf("scsi-generic: " fmt , ## __VA_ARGS__); } while (0) +#else +#define DPRINTF(fmt, ...) do {} while(0) +#endif + +#define BADF(fmt, ...) \ +do { fprintf(stderr, "scsi-generic: " fmt , ## __VA_ARGS__); } while (0) + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <scsi/sg.h> +#include "block/scsi.h" + +#define SG_ERR_DRIVER_TIMEOUT 0x06 +#define SG_ERR_DRIVER_SENSE 0x08 + +#define SG_ERR_DID_OK 0x00 +#define SG_ERR_DID_NO_CONNECT 0x01 +#define SG_ERR_DID_BUS_BUSY 0x02 +#define SG_ERR_DID_TIME_OUT 0x03 + +#ifndef MAX_UINT +#define MAX_UINT ((unsigned int)-1) +#endif + +typedef struct SCSIGenericReq { + SCSIRequest req; + uint8_t *buf; + int buflen; + int len; + sg_io_hdr_t io_header; +} SCSIGenericReq; + +static void scsi_generic_save_request(QEMUFile *f, SCSIRequest *req) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + + qemu_put_sbe32s(f, &r->buflen); + if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) { + assert(!r->req.sg); + qemu_put_buffer(f, r->buf, r->req.cmd.xfer); + } +} + +static void scsi_generic_load_request(QEMUFile *f, SCSIRequest *req) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + + qemu_get_sbe32s(f, &r->buflen); + if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) { + assert(!r->req.sg); + qemu_get_buffer(f, r->buf, r->req.cmd.xfer); + } +} + +static void scsi_free_request(SCSIRequest *req) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + + g_free(r->buf); +} + +/* Helper function for command completion. */ +static void scsi_command_complete(void *opaque, int ret) +{ + int status; + SCSIGenericReq *r = (SCSIGenericReq *)opaque; + + r->req.aiocb = NULL; + if (r->req.io_canceled) { + scsi_req_cancel_complete(&r->req); + goto done; + } + if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) { + r->req.sense_len = r->io_header.sb_len_wr; + } + + if (ret != 0) { + switch (ret) { + case -EDOM: + status = TASK_SET_FULL; + break; + case -ENOMEM: + status = CHECK_CONDITION; + scsi_req_build_sense(&r->req, SENSE_CODE(TARGET_FAILURE)); + break; + default: + status = CHECK_CONDITION; + scsi_req_build_sense(&r->req, SENSE_CODE(IO_ERROR)); + break; + } + } else { + if (r->io_header.host_status == SG_ERR_DID_NO_CONNECT || + r->io_header.host_status == SG_ERR_DID_BUS_BUSY || + r->io_header.host_status == SG_ERR_DID_TIME_OUT || + (r->io_header.driver_status & SG_ERR_DRIVER_TIMEOUT)) { + status = BUSY; + BADF("Driver Timeout\n"); + } else if (r->io_header.host_status) { + status = CHECK_CONDITION; + scsi_req_build_sense(&r->req, SENSE_CODE(I_T_NEXUS_LOSS)); + } else if (r->io_header.status) { + status = r->io_header.status; + } else if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) { + status = CHECK_CONDITION; + } else { + status = GOOD; + } + } + DPRINTF("Command complete 0x%p tag=0x%x status=%d\n", + r, r->req.tag, status); + + scsi_req_complete(&r->req, status); +done: + scsi_req_unref(&r->req); +} + +static int execute_command(BlockBackend *blk, + SCSIGenericReq *r, int direction, + BlockCompletionFunc *complete) +{ + r->io_header.interface_id = 'S'; + r->io_header.dxfer_direction = direction; + r->io_header.dxferp = r->buf; + r->io_header.dxfer_len = r->buflen; + r->io_header.cmdp = r->req.cmd.buf; + r->io_header.cmd_len = r->req.cmd.len; + r->io_header.mx_sb_len = sizeof(r->req.sense); + r->io_header.sbp = r->req.sense; + r->io_header.timeout = MAX_UINT; + r->io_header.usr_ptr = r; + r->io_header.flags |= SG_FLAG_DIRECT_IO; + + r->req.aiocb = blk_aio_ioctl(blk, SG_IO, &r->io_header, complete, r); + if (r->req.aiocb == NULL) { + return -EIO; + } + + return 0; +} + +static void scsi_read_complete(void * opaque, int ret) +{ + SCSIGenericReq *r = (SCSIGenericReq *)opaque; + SCSIDevice *s = r->req.dev; + int len; + + r->req.aiocb = NULL; + if (ret || r->req.io_canceled) { + scsi_command_complete(r, ret); + return; + } + len = r->io_header.dxfer_len - r->io_header.resid; + DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len); + + r->len = -1; + if (len == 0) { + scsi_command_complete(r, 0); + } else { + /* Snoop READ CAPACITY output to set the blocksize. */ + if (r->req.cmd.buf[0] == READ_CAPACITY_10 && + (ldl_be_p(&r->buf[0]) != 0xffffffffU || s->max_lba == 0)) { + s->blocksize = ldl_be_p(&r->buf[4]); + s->max_lba = ldl_be_p(&r->buf[0]) & 0xffffffffULL; + } else if (r->req.cmd.buf[0] == SERVICE_ACTION_IN_16 && + (r->req.cmd.buf[1] & 31) == SAI_READ_CAPACITY_16) { + s->blocksize = ldl_be_p(&r->buf[8]); + s->max_lba = ldq_be_p(&r->buf[0]); + } + blk_set_guest_block_size(s->conf.blk, s->blocksize); + + scsi_req_data(&r->req, len); + scsi_req_unref(&r->req); + } +} + +/* Read more data from scsi device into buffer. */ +static void scsi_read_data(SCSIRequest *req) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + SCSIDevice *s = r->req.dev; + int ret; + + DPRINTF("scsi_read_data 0x%x\n", req->tag); + + /* The request is used as the AIO opaque value, so add a ref. */ + scsi_req_ref(&r->req); + if (r->len == -1) { + scsi_command_complete(r, 0); + return; + } + + ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV, + scsi_read_complete); + if (ret < 0) { + scsi_command_complete(r, ret); + } +} + +static void scsi_write_complete(void * opaque, int ret) +{ + SCSIGenericReq *r = (SCSIGenericReq *)opaque; + SCSIDevice *s = r->req.dev; + + DPRINTF("scsi_write_complete() ret = %d\n", ret); + r->req.aiocb = NULL; + if (ret || r->req.io_canceled) { + scsi_command_complete(r, ret); + return; + } + + if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 && + s->type == TYPE_TAPE) { + s->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11]; + DPRINTF("block size %d\n", s->blocksize); + } + + scsi_command_complete(r, ret); +} + +/* Write data to a scsi device. Returns nonzero on failure. + The transfer may complete asynchronously. */ +static void scsi_write_data(SCSIRequest *req) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + SCSIDevice *s = r->req.dev; + int ret; + + DPRINTF("scsi_write_data 0x%x\n", req->tag); + if (r->len == 0) { + r->len = r->buflen; + scsi_req_data(&r->req, r->len); + return; + } + + /* The request is used as the AIO opaque value, so add a ref. */ + scsi_req_ref(&r->req); + ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete); + if (ret < 0) { + scsi_command_complete(r, ret); + } +} + +/* Return a pointer to the data buffer. */ +static uint8_t *scsi_get_buf(SCSIRequest *req) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + + return r->buf; +} + +/* Execute a scsi command. Returns the length of the data expected by the + command. This will be Positive for data transfers from the device + (eg. disk reads), negative for transfers to the device (eg. disk writes), + and zero if the command does not transfer any data. */ + +static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd) +{ + SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); + SCSIDevice *s = r->req.dev; + int ret; + +#ifdef DEBUG_SCSI + { + int i; + for (i = 1; i < r->req.cmd.len; i++) { + printf(" 0x%02x", cmd[i]); + } + printf("\n"); + } +#endif + + if (r->req.cmd.xfer == 0) { + g_free(r->buf); + r->buflen = 0; + r->buf = NULL; + /* The request is used as the AIO opaque value, so add a ref. */ + scsi_req_ref(&r->req); + ret = execute_command(s->conf.blk, r, SG_DXFER_NONE, + scsi_command_complete); + if (ret < 0) { + scsi_command_complete(r, ret); + return 0; + } + return 0; + } + + if (r->buflen != r->req.cmd.xfer) { + g_free(r->buf); + r->buf = g_malloc(r->req.cmd.xfer); + r->buflen = r->req.cmd.xfer; + } + + memset(r->buf, 0, r->buflen); + r->len = r->req.cmd.xfer; + if (r->req.cmd.mode == SCSI_XFER_TO_DEV) { + r->len = 0; + return -r->req.cmd.xfer; + } else { + return r->req.cmd.xfer; + } +} + +static int get_stream_blocksize(BlockBackend *blk) +{ + uint8_t cmd[6]; + uint8_t buf[12]; + uint8_t sensebuf[8]; + sg_io_hdr_t io_header; + int ret; + + memset(cmd, 0, sizeof(cmd)); + memset(buf, 0, sizeof(buf)); + cmd[0] = MODE_SENSE; + cmd[4] = sizeof(buf); + + memset(&io_header, 0, sizeof(io_header)); + io_header.interface_id = 'S'; + io_header.dxfer_direction = SG_DXFER_FROM_DEV; + io_header.dxfer_len = sizeof(buf); + io_header.dxferp = buf; + io_header.cmdp = cmd; + io_header.cmd_len = sizeof(cmd); + io_header.mx_sb_len = sizeof(sensebuf); + io_header.sbp = sensebuf; + io_header.timeout = 6000; /* XXX */ + + ret = blk_ioctl(blk, SG_IO, &io_header); + if (ret < 0 || io_header.driver_status || io_header.host_status) { + return -1; + } + return (buf[9] << 16) | (buf[10] << 8) | buf[11]; +} + +static void scsi_generic_reset(DeviceState *dev) +{ + SCSIDevice *s = SCSI_DEVICE(dev); + + scsi_device_purge_requests(s, SENSE_CODE(RESET)); +} + +static void scsi_generic_realize(SCSIDevice *s, Error **errp) +{ + int rc; + int sg_version; + struct sg_scsi_id scsiid; + + if (!s->conf.blk) { + error_setg(errp, "drive property not set"); + return; + } + + if (blk_get_on_error(s->conf.blk, 0) != BLOCKDEV_ON_ERROR_ENOSPC) { + error_setg(errp, "Device doesn't support drive option werror"); + return; + } + if (blk_get_on_error(s->conf.blk, 1) != BLOCKDEV_ON_ERROR_REPORT) { + error_setg(errp, "Device doesn't support drive option rerror"); + return; + } + + /* check we are using a driver managing SG_IO (version 3 and after */ + rc = blk_ioctl(s->conf.blk, SG_GET_VERSION_NUM, &sg_version); + if (rc < 0) { + error_setg(errp, "cannot get SG_IO version number: %s. " + "Is this a SCSI device?", + strerror(-rc)); + return; + } + if (sg_version < 30000) { + error_setg(errp, "scsi generic interface too old"); + return; + } + + /* get LUN of the /dev/sg? */ + if (blk_ioctl(s->conf.blk, SG_GET_SCSI_ID, &scsiid)) { + error_setg(errp, "SG_GET_SCSI_ID ioctl failed"); + return; + } + + /* define device state */ + s->type = scsiid.scsi_type; + DPRINTF("device type %d\n", s->type); + + switch (s->type) { + case TYPE_TAPE: + s->blocksize = get_stream_blocksize(s->conf.blk); + if (s->blocksize == -1) { + s->blocksize = 0; + } + break; + + /* Make a guess for block devices, we'll fix it when the guest sends. + * READ CAPACITY. If they don't, they likely would assume these sizes + * anyway. (TODO: they could also send MODE SENSE). + */ + case TYPE_ROM: + case TYPE_WORM: + s->blocksize = 2048; + break; + default: + s->blocksize = 512; + break; + } + + DPRINTF("block size %d\n", s->blocksize); +} + +const SCSIReqOps scsi_generic_req_ops = { + .size = sizeof(SCSIGenericReq), + .free_req = scsi_free_request, + .send_command = scsi_send_command, + .read_data = scsi_read_data, + .write_data = scsi_write_data, + .get_buf = scsi_get_buf, + .load_request = scsi_generic_load_request, + .save_request = scsi_generic_save_request, +}; + +static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun, + uint8_t *buf, void *hba_private) +{ + SCSIRequest *req; + + req = scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private); + return req; +} + +static Property scsi_generic_properties[] = { + DEFINE_PROP_DRIVE("drive", SCSIDevice, conf.blk), + DEFINE_PROP_END_OF_LIST(), +}; + +static int scsi_generic_parse_cdb(SCSIDevice *dev, SCSICommand *cmd, + uint8_t *buf, void *hba_private) +{ + return scsi_bus_parse_cdb(dev, cmd, buf, hba_private); +} + +static void scsi_generic_class_initfn(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SCSIDeviceClass *sc = SCSI_DEVICE_CLASS(klass); + + sc->realize = scsi_generic_realize; + sc->alloc_req = scsi_new_request; + sc->parse_cdb = scsi_generic_parse_cdb; + dc->fw_name = "disk"; + dc->desc = "pass through generic scsi device (/dev/sg*)"; + dc->reset = scsi_generic_reset; + dc->props = scsi_generic_properties; + dc->vmsd = &vmstate_scsi_device; +} + +static const TypeInfo scsi_generic_info = { + .name = "scsi-generic", + .parent = TYPE_SCSI_DEVICE, + .instance_size = sizeof(SCSIDevice), + .class_init = scsi_generic_class_initfn, +}; + +static void scsi_generic_register_types(void) +{ + type_register_static(&scsi_generic_info); +} + +type_init(scsi_generic_register_types) + +#endif /* __linux__ */ |