diff options
Diffstat (limited to 'kernel/drivers/scsi/sd.c')
| -rw-r--r-- | kernel/drivers/scsi/sd.c | 3302 |
1 files changed, 3302 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/sd.c b/kernel/drivers/scsi/sd.c new file mode 100644 index 000000000..7f9d65fe4 --- /dev/null +++ b/kernel/drivers/scsi/sd.c @@ -0,0 +1,3302 @@ +/* + * sd.c Copyright (C) 1992 Drew Eckhardt + * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale + * + * Linux scsi disk driver + * Initial versions: Drew Eckhardt + * Subsequent revisions: Eric Youngdale + * Modification history: + * - Drew Eckhardt <drew@colorado.edu> original + * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple + * outstanding request, and other enhancements. + * Support loadable low-level scsi drivers. + * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using + * eight major numbers. + * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. + * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in + * sd_init and cleanups. + * - Alex Davis <letmein@erols.com> Fix problem where partition info + * not being read in sd_open. Fix problem where removable media + * could be ejected after sd_open. + * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x + * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox + * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: + * Support 32k/1M disks. + * + * Logging policy (needs CONFIG_SCSI_LOGGING defined): + * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 + * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 + * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 + * - entering other commands: SCSI_LOG_HLQUEUE level 3 + * Note: when the logging level is set by the user, it must be greater + * than the level indicated above to trigger output. + */ + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/bio.h> +#include <linux/genhd.h> +#include <linux/hdreg.h> +#include <linux/errno.h> +#include <linux/idr.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/blkpg.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/string_helpers.h> +#include <linux/async.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <asm/uaccess.h> +#include <asm/unaligned.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/scsicam.h> + +#include "sd.h" +#include "scsi_priv.h" +#include "scsi_logging.h" + +MODULE_AUTHOR("Eric Youngdale"); +MODULE_DESCRIPTION("SCSI disk (sd) driver"); +MODULE_LICENSE("GPL"); + +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); +MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); +MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); +MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); +MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); + +#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) +#define SD_MINORS 16 +#else +#define SD_MINORS 0 +#endif + +static void sd_config_discard(struct scsi_disk *, unsigned int); +static void sd_config_write_same(struct scsi_disk *); +static int sd_revalidate_disk(struct gendisk *); +static void sd_unlock_native_capacity(struct gendisk *disk); +static int sd_probe(struct device *); +static int sd_remove(struct device *); +static void sd_shutdown(struct device *); +static int sd_suspend_system(struct device *); +static int sd_suspend_runtime(struct device *); +static int sd_resume(struct device *); +static void sd_rescan(struct device *); +static int sd_init_command(struct scsi_cmnd *SCpnt); +static void sd_uninit_command(struct scsi_cmnd *SCpnt); +static int sd_done(struct scsi_cmnd *); +static int sd_eh_action(struct scsi_cmnd *, int); +static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); +static void scsi_disk_release(struct device *cdev); +static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); +static void sd_print_result(const struct scsi_disk *, const char *, int); + +static DEFINE_SPINLOCK(sd_index_lock); +static DEFINE_IDA(sd_index_ida); + +/* This semaphore is used to mediate the 0->1 reference get in the + * face of object destruction (i.e. we can't allow a get on an + * object after last put) */ +static DEFINE_MUTEX(sd_ref_mutex); + +static struct kmem_cache *sd_cdb_cache; +static mempool_t *sd_cdb_pool; + +static const char *sd_cache_types[] = { + "write through", "none", "write back", + "write back, no read (daft)" +}; + +static void sd_set_flush_flag(struct scsi_disk *sdkp) +{ + unsigned flush = 0; + + if (sdkp->WCE) { + flush |= REQ_FLUSH; + if (sdkp->DPOFUA) + flush |= REQ_FUA; + } + + blk_queue_flush(sdkp->disk->queue, flush); +} + +static ssize_t +cache_type_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int i, ct = -1, rcd, wce, sp; + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + char buffer[64]; + char *buffer_data; + struct scsi_mode_data data; + struct scsi_sense_hdr sshdr; + static const char temp[] = "temporary "; + int len; + + if (sdp->type != TYPE_DISK) + /* no cache control on RBC devices; theoretically they + * can do it, but there's probably so many exceptions + * it's not worth the risk */ + return -EINVAL; + + if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { + buf += sizeof(temp) - 1; + sdkp->cache_override = 1; + } else { + sdkp->cache_override = 0; + } + + for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { + len = strlen(sd_cache_types[i]); + if (strncmp(sd_cache_types[i], buf, len) == 0 && + buf[len] == '\n') { + ct = i; + break; + } + } + if (ct < 0) + return -EINVAL; + rcd = ct & 0x01 ? 1 : 0; + wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; + + if (sdkp->cache_override) { + sdkp->WCE = wce; + sdkp->RCD = rcd; + sd_set_flush_flag(sdkp); + return count; + } + + if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, + SD_MAX_RETRIES, &data, NULL)) + return -EINVAL; + len = min_t(size_t, sizeof(buffer), data.length - data.header_length - + data.block_descriptor_length); + buffer_data = buffer + data.header_length + + data.block_descriptor_length; + buffer_data[2] &= ~0x05; + buffer_data[2] |= wce << 2 | rcd; + sp = buffer_data[0] & 0x80 ? 1 : 0; + + if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, + SD_MAX_RETRIES, &data, &sshdr)) { + if (scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + return -EINVAL; + } + revalidate_disk(sdkp->disk); + return count; +} + +static ssize_t +manage_start_stop_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + + return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); +} + +static ssize_t +manage_start_stop_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); + + return count; +} +static DEVICE_ATTR_RW(manage_start_stop); + +static ssize_t +allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); +} + +static ssize_t +allow_restart_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (sdp->type != TYPE_DISK) + return -EINVAL; + + sdp->allow_restart = simple_strtoul(buf, NULL, 10); + + return count; +} +static DEVICE_ATTR_RW(allow_restart); + +static ssize_t +cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + int ct = sdkp->RCD + 2*sdkp->WCE; + + return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); +} +static DEVICE_ATTR_RW(cache_type); + +static ssize_t +FUA_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); +} +static DEVICE_ATTR_RO(FUA); + +static ssize_t +protection_type_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%u\n", sdkp->protection_type); +} + +static ssize_t +protection_type_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + unsigned int val; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + err = kstrtouint(buf, 10, &val); + + if (err) + return err; + + if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) + sdkp->protection_type = val; + + return count; +} +static DEVICE_ATTR_RW(protection_type); + +static ssize_t +protection_mode_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + unsigned int dif, dix; + + dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); + dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); + + if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { + dif = 0; + dix = 1; + } + + if (!dif && !dix) + return snprintf(buf, 20, "none\n"); + + return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); +} +static DEVICE_ATTR_RO(protection_mode); + +static ssize_t +app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%u\n", sdkp->ATO); +} +static DEVICE_ATTR_RO(app_tag_own); + +static ssize_t +thin_provisioning_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%u\n", sdkp->lbpme); +} +static DEVICE_ATTR_RO(thin_provisioning); + +static const char *lbp_mode[] = { + [SD_LBP_FULL] = "full", + [SD_LBP_UNMAP] = "unmap", + [SD_LBP_WS16] = "writesame_16", + [SD_LBP_WS10] = "writesame_10", + [SD_LBP_ZERO] = "writesame_zero", + [SD_LBP_DISABLE] = "disabled", +}; + +static ssize_t +provisioning_mode_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); +} + +static ssize_t +provisioning_mode_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (sdp->type != TYPE_DISK) + return -EINVAL; + + if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) + sd_config_discard(sdkp, SD_LBP_UNMAP); + else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) + sd_config_discard(sdkp, SD_LBP_WS16); + else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) + sd_config_discard(sdkp, SD_LBP_WS10); + else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) + sd_config_discard(sdkp, SD_LBP_ZERO); + else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) + sd_config_discard(sdkp, SD_LBP_DISABLE); + else + return -EINVAL; + + return count; +} +static DEVICE_ATTR_RW(provisioning_mode); + +static ssize_t +max_medium_access_timeouts_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); +} + +static ssize_t +max_medium_access_timeouts_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); + + return err ? err : count; +} +static DEVICE_ATTR_RW(max_medium_access_timeouts); + +static ssize_t +max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + + return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); +} + +static ssize_t +max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct scsi_device *sdp = sdkp->device; + unsigned long max; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (sdp->type != TYPE_DISK) + return -EINVAL; + + err = kstrtoul(buf, 10, &max); + + if (err) + return err; + + if (max == 0) + sdp->no_write_same = 1; + else if (max <= SD_MAX_WS16_BLOCKS) { + sdp->no_write_same = 0; + sdkp->max_ws_blocks = max; + } + + sd_config_write_same(sdkp); + + return count; +} +static DEVICE_ATTR_RW(max_write_same_blocks); + +static struct attribute *sd_disk_attrs[] = { + &dev_attr_cache_type.attr, + &dev_attr_FUA.attr, + &dev_attr_allow_restart.attr, + &dev_attr_manage_start_stop.attr, + &dev_attr_protection_type.attr, + &dev_attr_protection_mode.attr, + &dev_attr_app_tag_own.attr, + &dev_attr_thin_provisioning.attr, + &dev_attr_provisioning_mode.attr, + &dev_attr_max_write_same_blocks.attr, + &dev_attr_max_medium_access_timeouts.attr, + NULL, +}; +ATTRIBUTE_GROUPS(sd_disk); + +static struct class sd_disk_class = { + .name = "scsi_disk", + .owner = THIS_MODULE, + .dev_release = scsi_disk_release, + .dev_groups = sd_disk_groups, +}; + +static const struct dev_pm_ops sd_pm_ops = { + .suspend = sd_suspend_system, + .resume = sd_resume, + .poweroff = sd_suspend_system, + .restore = sd_resume, + .runtime_suspend = sd_suspend_runtime, + .runtime_resume = sd_resume, +}; + +static struct scsi_driver sd_template = { + .gendrv = { + .name = "sd", + .owner = THIS_MODULE, + .probe = sd_probe, + .remove = sd_remove, + .shutdown = sd_shutdown, + .pm = &sd_pm_ops, + }, + .rescan = sd_rescan, + .init_command = sd_init_command, + .uninit_command = sd_uninit_command, + .done = sd_done, + .eh_action = sd_eh_action, +}; + +/* + * Dummy kobj_map->probe function. + * The default ->probe function will call modprobe, which is + * pointless as this module is already loaded. + */ +static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) +{ + return NULL; +} + +/* + * Device no to disk mapping: + * + * major disc2 disc p1 + * |............|.............|....|....| <- dev_t + * 31 20 19 8 7 4 3 0 + * + * Inside a major, we have 16k disks, however mapped non- + * contiguously. The first 16 disks are for major0, the next + * ones with major1, ... Disk 256 is for major0 again, disk 272 + * for major1, ... + * As we stay compatible with our numbering scheme, we can reuse + * the well-know SCSI majors 8, 65--71, 136--143. + */ +static int sd_major(int major_idx) +{ + switch (major_idx) { + case 0: + return SCSI_DISK0_MAJOR; + case 1 ... 7: + return SCSI_DISK1_MAJOR + major_idx - 1; + case 8 ... 15: + return SCSI_DISK8_MAJOR + major_idx - 8; + default: + BUG(); + return 0; /* shut up gcc */ + } +} + +static struct scsi_disk *scsi_disk_get(struct gendisk *disk) +{ + struct scsi_disk *sdkp = NULL; + + mutex_lock(&sd_ref_mutex); + + if (disk->private_data) { + sdkp = scsi_disk(disk); + if (scsi_device_get(sdkp->device) == 0) + get_device(&sdkp->dev); + else + sdkp = NULL; + } + mutex_unlock(&sd_ref_mutex); + return sdkp; +} + +static void scsi_disk_put(struct scsi_disk *sdkp) +{ + struct scsi_device *sdev = sdkp->device; + + mutex_lock(&sd_ref_mutex); + put_device(&sdkp->dev); + scsi_device_put(sdev); + mutex_unlock(&sd_ref_mutex); +} + +static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, + unsigned int dix, unsigned int dif) +{ + struct bio *bio = scmd->request->bio; + unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); + unsigned int protect = 0; + + if (dix) { /* DIX Type 0, 1, 2, 3 */ + if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) + scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; + + if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) + scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; + } + + if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ + scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; + + if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) + scmd->prot_flags |= SCSI_PROT_REF_CHECK; + } + + if (dif) { /* DIX/DIF Type 1, 2, 3 */ + scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; + + if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) + protect = 3 << 5; /* Disable target PI checking */ + else + protect = 1 << 5; /* Enable target PI checking */ + } + + scsi_set_prot_op(scmd, prot_op); + scsi_set_prot_type(scmd, dif); + scmd->prot_flags &= sd_prot_flag_mask(prot_op); + + return protect; +} + +static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) +{ + struct request_queue *q = sdkp->disk->queue; + unsigned int logical_block_size = sdkp->device->sector_size; + unsigned int max_blocks = 0; + + q->limits.discard_zeroes_data = 0; + q->limits.discard_alignment = sdkp->unmap_alignment * + logical_block_size; + q->limits.discard_granularity = + max(sdkp->physical_block_size, + sdkp->unmap_granularity * logical_block_size); + + sdkp->provisioning_mode = mode; + + switch (mode) { + + case SD_LBP_DISABLE: + q->limits.max_discard_sectors = 0; + queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); + return; + + case SD_LBP_UNMAP: + max_blocks = min_not_zero(sdkp->max_unmap_blocks, + (u32)SD_MAX_WS16_BLOCKS); + break; + + case SD_LBP_WS16: + max_blocks = min_not_zero(sdkp->max_ws_blocks, + (u32)SD_MAX_WS16_BLOCKS); + q->limits.discard_zeroes_data = sdkp->lbprz; + break; + + case SD_LBP_WS10: + max_blocks = min_not_zero(sdkp->max_ws_blocks, + (u32)SD_MAX_WS10_BLOCKS); + q->limits.discard_zeroes_data = sdkp->lbprz; + break; + + case SD_LBP_ZERO: + max_blocks = min_not_zero(sdkp->max_ws_blocks, + (u32)SD_MAX_WS10_BLOCKS); + q->limits.discard_zeroes_data = 1; + break; + } + + q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); +} + +/** + * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device + * @sdp: scsi device to operate one + * @rq: Request to prepare + * + * Will issue either UNMAP or WRITE SAME(16) depending on preference + * indicated by target device. + **/ +static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) +{ + struct request *rq = cmd->request; + struct scsi_device *sdp = cmd->device; + struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); + sector_t sector = blk_rq_pos(rq); + unsigned int nr_sectors = blk_rq_sectors(rq); + unsigned int nr_bytes = blk_rq_bytes(rq); + unsigned int len; + int ret; + char *buf; + struct page *page; + + sector >>= ilog2(sdp->sector_size) - 9; + nr_sectors >>= ilog2(sdp->sector_size) - 9; + + page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!page) + return BLKPREP_DEFER; + + switch (sdkp->provisioning_mode) { + case SD_LBP_UNMAP: + buf = page_address(page); + + cmd->cmd_len = 10; + cmd->cmnd[0] = UNMAP; + cmd->cmnd[8] = 24; + + put_unaligned_be16(6 + 16, &buf[0]); + put_unaligned_be16(16, &buf[2]); + put_unaligned_be64(sector, &buf[8]); + put_unaligned_be32(nr_sectors, &buf[16]); + + len = 24; + break; + + case SD_LBP_WS16: + cmd->cmd_len = 16; + cmd->cmnd[0] = WRITE_SAME_16; + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be64(sector, &cmd->cmnd[2]); + put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + + len = sdkp->device->sector_size; + break; + + case SD_LBP_WS10: + case SD_LBP_ZERO: + cmd->cmd_len = 10; + cmd->cmnd[0] = WRITE_SAME; + if (sdkp->provisioning_mode == SD_LBP_WS10) + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be32(sector, &cmd->cmnd[2]); + put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); + + len = sdkp->device->sector_size; + break; + + default: + ret = BLKPREP_KILL; + goto out; + } + + rq->completion_data = page; + rq->timeout = SD_TIMEOUT; + + cmd->transfersize = len; + cmd->allowed = SD_MAX_RETRIES; + + /* + * Initially __data_len is set to the amount of data that needs to be + * transferred to the target. This amount depends on whether WRITE SAME + * or UNMAP is being used. After the scatterlist has been mapped by + * scsi_init_io() we set __data_len to the size of the area to be + * discarded on disk. This allows us to report completion on the full + * amount of blocks described by the request. + */ + blk_add_request_payload(rq, page, len); + ret = scsi_init_io(cmd); + rq->__data_len = nr_bytes; + +out: + if (ret != BLKPREP_OK) + __free_page(page); + return ret; +} + +static void sd_config_write_same(struct scsi_disk *sdkp) +{ + struct request_queue *q = sdkp->disk->queue; + unsigned int logical_block_size = sdkp->device->sector_size; + + if (sdkp->device->no_write_same) { + sdkp->max_ws_blocks = 0; + goto out; + } + + /* Some devices can not handle block counts above 0xffff despite + * supporting WRITE SAME(16). Consequently we default to 64k + * blocks per I/O unless the device explicitly advertises a + * bigger limit. + */ + if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) + sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, + (u32)SD_MAX_WS16_BLOCKS); + else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) + sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, + (u32)SD_MAX_WS10_BLOCKS); + else { + sdkp->device->no_write_same = 1; + sdkp->max_ws_blocks = 0; + } + +out: + blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * + (logical_block_size >> 9)); +} + +/** + * sd_setup_write_same_cmnd - write the same data to multiple blocks + * @cmd: command to prepare + * + * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on + * preference indicated by target device. + **/ +static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) +{ + struct request *rq = cmd->request; + struct scsi_device *sdp = cmd->device; + struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); + struct bio *bio = rq->bio; + sector_t sector = blk_rq_pos(rq); + unsigned int nr_sectors = blk_rq_sectors(rq); + unsigned int nr_bytes = blk_rq_bytes(rq); + int ret; + + if (sdkp->device->no_write_same) + return BLKPREP_KILL; + + BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); + + sector >>= ilog2(sdp->sector_size) - 9; + nr_sectors >>= ilog2(sdp->sector_size) - 9; + + rq->timeout = SD_WRITE_SAME_TIMEOUT; + + if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { + cmd->cmd_len = 16; + cmd->cmnd[0] = WRITE_SAME_16; + put_unaligned_be64(sector, &cmd->cmnd[2]); + put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + } else { + cmd->cmd_len = 10; + cmd->cmnd[0] = WRITE_SAME; + put_unaligned_be32(sector, &cmd->cmnd[2]); + put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); + } + + cmd->transfersize = sdp->sector_size; + cmd->allowed = SD_MAX_RETRIES; + + /* + * For WRITE_SAME the data transferred in the DATA IN buffer is + * different from the amount of data actually written to the target. + * + * We set up __data_len to the amount of data transferred from the + * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list + * to transfer a single sector of data first, but then reset it to + * the amount of data to be written right after so that the I/O path + * knows how much to actually write. + */ + rq->__data_len = sdp->sector_size; + ret = scsi_init_io(cmd); + rq->__data_len = nr_bytes; + return ret; +} + +static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd) +{ + struct request *rq = cmd->request; + + /* flush requests don't perform I/O, zero the S/G table */ + memset(&cmd->sdb, 0, sizeof(cmd->sdb)); + + cmd->cmnd[0] = SYNCHRONIZE_CACHE; + cmd->cmd_len = 10; + cmd->transfersize = 0; + cmd->allowed = SD_MAX_RETRIES; + + rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; + return BLKPREP_OK; +} + +static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt) +{ + struct request *rq = SCpnt->request; + struct scsi_device *sdp = SCpnt->device; + struct gendisk *disk = rq->rq_disk; + struct scsi_disk *sdkp; + sector_t block = blk_rq_pos(rq); + sector_t threshold; + unsigned int this_count = blk_rq_sectors(rq); + unsigned int dif, dix; + int ret; + unsigned char protect; + + ret = scsi_init_io(SCpnt); + if (ret != BLKPREP_OK) + goto out; + SCpnt = rq->special; + sdkp = scsi_disk(disk); + + /* from here on until we're complete, any goto out + * is used for a killable error condition */ + ret = BLKPREP_KILL; + + SCSI_LOG_HLQUEUE(1, + scmd_printk(KERN_INFO, SCpnt, + "%s: block=%llu, count=%d\n", + __func__, (unsigned long long)block, this_count)); + + if (!sdp || !scsi_device_online(sdp) || + block + blk_rq_sectors(rq) > get_capacity(disk)) { + SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, + "Finishing %u sectors\n", + blk_rq_sectors(rq))); + SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, + "Retry with 0x%p\n", SCpnt)); + goto out; + } + + if (sdp->changed) { + /* + * quietly refuse to do anything to a changed disc until + * the changed bit has been reset + */ + /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ + goto out; + } + + /* + * Some SD card readers can't handle multi-sector accesses which touch + * the last one or two hardware sectors. Split accesses as needed. + */ + threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * + (sdp->sector_size / 512); + + if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { + if (block < threshold) { + /* Access up to the threshold but not beyond */ + this_count = threshold - block; + } else { + /* Access only a single hardware sector */ + this_count = sdp->sector_size / 512; + } + } + + SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", + (unsigned long long)block)); + + /* + * If we have a 1K hardware sectorsize, prevent access to single + * 512 byte sectors. In theory we could handle this - in fact + * the scsi cdrom driver must be able to handle this because + * we typically use 1K blocksizes, and cdroms typically have + * 2K hardware sectorsizes. Of course, things are simpler + * with the cdrom, since it is read-only. For performance + * reasons, the filesystems should be able to handle this + * and not force the scsi disk driver to use bounce buffers + * for this. + */ + if (sdp->sector_size == 1024) { + if ((block & 1) || (blk_rq_sectors(rq) & 1)) { + scmd_printk(KERN_ERR, SCpnt, + "Bad block number requested\n"); + goto out; + } else { + block = block >> 1; + this_count = this_count >> 1; + } + } + if (sdp->sector_size == 2048) { + if ((block & 3) || (blk_rq_sectors(rq) & 3)) { + scmd_printk(KERN_ERR, SCpnt, + "Bad block number requested\n"); + goto out; + } else { + block = block >> 2; + this_count = this_count >> 2; + } + } + if (sdp->sector_size == 4096) { + if ((block & 7) || (blk_rq_sectors(rq) & 7)) { + scmd_printk(KERN_ERR, SCpnt, + "Bad block number requested\n"); + goto out; + } else { + block = block >> 3; + this_count = this_count >> 3; + } + } + if (rq_data_dir(rq) == WRITE) { + SCpnt->cmnd[0] = WRITE_6; + + if (blk_integrity_rq(rq)) + sd_dif_prepare(SCpnt); + + } else if (rq_data_dir(rq) == READ) { + SCpnt->cmnd[0] = READ_6; + } else { + scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags); + goto out; + } + + SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, + "%s %d/%u 512 byte blocks.\n", + (rq_data_dir(rq) == WRITE) ? + "writing" : "reading", this_count, + blk_rq_sectors(rq))); + + dix = scsi_prot_sg_count(SCpnt); + dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type); + + if (dif || dix) + protect = sd_setup_protect_cmnd(SCpnt, dix, dif); + else + protect = 0; + + if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) { + SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); + + if (unlikely(SCpnt->cmnd == NULL)) { + ret = BLKPREP_DEFER; + goto out; + } + + SCpnt->cmd_len = SD_EXT_CDB_SIZE; + memset(SCpnt->cmnd, 0, SCpnt->cmd_len); + SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; + SCpnt->cmnd[7] = 0x18; + SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; + SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); + + /* LBA */ + SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; + SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; + SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; + SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; + SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; + SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; + SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; + SCpnt->cmnd[19] = (unsigned char) block & 0xff; + + /* Expected Indirect LBA */ + SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; + SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; + SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; + SCpnt->cmnd[23] = (unsigned char) block & 0xff; + + /* Transfer length */ + SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; + SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; + SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; + SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; + } else if (sdp->use_16_for_rw || (this_count > 0xffff)) { + SCpnt->cmnd[0] += READ_16 - READ_6; + SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); + SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; + SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; + SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; + SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; + SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; + SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; + SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; + SCpnt->cmnd[9] = (unsigned char) block & 0xff; + SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; + SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; + SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; + SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; + SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; + } else if ((this_count > 0xff) || (block > 0x1fffff) || + scsi_device_protection(SCpnt->device) || + SCpnt->device->use_10_for_rw) { + SCpnt->cmnd[0] += READ_10 - READ_6; + SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); + SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; + SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; + SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; + SCpnt->cmnd[5] = (unsigned char) block & 0xff; + SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; + SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; + SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; + } else { + if (unlikely(rq->cmd_flags & REQ_FUA)) { + /* + * This happens only if this drive failed + * 10byte rw command with ILLEGAL_REQUEST + * during operation and thus turned off + * use_10_for_rw. + */ + scmd_printk(KERN_ERR, SCpnt, + "FUA write on READ/WRITE(6) drive\n"); + goto out; + } + + SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); + SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); + SCpnt->cmnd[3] = (unsigned char) block & 0xff; + SCpnt->cmnd[4] = (unsigned char) this_count; + SCpnt->cmnd[5] = 0; + } + SCpnt->sdb.length = this_count * sdp->sector_size; + + /* + * We shouldn't disconnect in the middle of a sector, so with a dumb + * host adapter, it's safe to assume that we can at least transfer + * this many bytes between each connect / disconnect. + */ + SCpnt->transfersize = sdp->sector_size; + SCpnt->underflow = this_count << 9; + SCpnt->allowed = SD_MAX_RETRIES; + + /* + * This indicates that the command is ready from our end to be + * queued. + */ + ret = BLKPREP_OK; + out: + return ret; +} + +static int sd_init_command(struct scsi_cmnd *cmd) +{ + struct request *rq = cmd->request; + + if (rq->cmd_flags & REQ_DISCARD) + return sd_setup_discard_cmnd(cmd); + else if (rq->cmd_flags & REQ_WRITE_SAME) + return sd_setup_write_same_cmnd(cmd); + else if (rq->cmd_flags & REQ_FLUSH) + return sd_setup_flush_cmnd(cmd); + else + return sd_setup_read_write_cmnd(cmd); +} + +static void sd_uninit_command(struct scsi_cmnd *SCpnt) +{ + struct request *rq = SCpnt->request; + + if (rq->cmd_flags & REQ_DISCARD) + __free_page(rq->completion_data); + + if (SCpnt->cmnd != rq->cmd) { + mempool_free(SCpnt->cmnd, sd_cdb_pool); + SCpnt->cmnd = NULL; + SCpnt->cmd_len = 0; + } +} + +/** + * sd_open - open a scsi disk device + * @inode: only i_rdev member may be used + * @filp: only f_mode and f_flags may be used + * + * Returns 0 if successful. Returns a negated errno value in case + * of error. + * + * Note: This can be called from a user context (e.g. fsck(1) ) + * or from within the kernel (e.g. as a result of a mount(1) ). + * In the latter case @inode and @filp carry an abridged amount + * of information as noted above. + * + * Locking: called with bdev->bd_mutex held. + **/ +static int sd_open(struct block_device *bdev, fmode_t mode) +{ + struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); + struct scsi_device *sdev; + int retval; + + if (!sdkp) + return -ENXIO; + + SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); + + sdev = sdkp->device; + + /* + * If the device is in error recovery, wait until it is done. + * If the device is offline, then disallow any access to it. + */ + retval = -ENXIO; + if (!scsi_block_when_processing_errors(sdev)) + goto error_out; + + if (sdev->removable || sdkp->write_prot) + check_disk_change(bdev); + + /* + * If the drive is empty, just let the open fail. + */ + retval = -ENOMEDIUM; + if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) + goto error_out; + + /* + * If the device has the write protect tab set, have the open fail + * if the user expects to be able to write to the thing. + */ + retval = -EROFS; + if (sdkp->write_prot && (mode & FMODE_WRITE)) + goto error_out; + + /* + * It is possible that the disk changing stuff resulted in + * the device being taken offline. If this is the case, + * report this to the user, and don't pretend that the + * open actually succeeded. + */ + retval = -ENXIO; + if (!scsi_device_online(sdev)) + goto error_out; + + if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { + if (scsi_block_when_processing_errors(sdev)) + scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); + } + + return 0; + +error_out: + scsi_disk_put(sdkp); + return retval; +} + +/** + * sd_release - invoked when the (last) close(2) is called on this + * scsi disk. + * @inode: only i_rdev member may be used + * @filp: only f_mode and f_flags may be used + * + * Returns 0. + * + * Note: may block (uninterruptible) if error recovery is underway + * on this disk. + * + * Locking: called with bdev->bd_mutex held. + **/ +static void sd_release(struct gendisk *disk, fmode_t mode) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + struct scsi_device *sdev = sdkp->device; + + SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); + + if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { + if (scsi_block_when_processing_errors(sdev)) + scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); + } + + /* + * XXX and what if there are packets in flight and this close() + * XXX is followed by a "rmmod sd_mod"? + */ + + scsi_disk_put(sdkp); +} + +static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); + struct scsi_device *sdp = sdkp->device; + struct Scsi_Host *host = sdp->host; + int diskinfo[4]; + + /* default to most commonly used values */ + diskinfo[0] = 0x40; /* 1 << 6 */ + diskinfo[1] = 0x20; /* 1 << 5 */ + diskinfo[2] = sdkp->capacity >> 11; + + /* override with calculated, extended default, or driver values */ + if (host->hostt->bios_param) + host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); + else + scsicam_bios_param(bdev, sdkp->capacity, diskinfo); + + geo->heads = diskinfo[0]; + geo->sectors = diskinfo[1]; + geo->cylinders = diskinfo[2]; + return 0; +} + +/** + * sd_ioctl - process an ioctl + * @inode: only i_rdev/i_bdev members may be used + * @filp: only f_mode and f_flags may be used + * @cmd: ioctl command number + * @arg: this is third argument given to ioctl(2) system call. + * Often contains a pointer. + * + * Returns 0 if successful (some ioctls return positive numbers on + * success as well). Returns a negated errno value in case of error. + * + * Note: most ioctls are forward onto the block subsystem or further + * down in the scsi subsystem. + **/ +static int sd_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct gendisk *disk = bdev->bd_disk; + struct scsi_disk *sdkp = scsi_disk(disk); + struct scsi_device *sdp = sdkp->device; + void __user *p = (void __user *)arg; + int error; + + SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " + "cmd=0x%x\n", disk->disk_name, cmd)); + + error = scsi_verify_blk_ioctl(bdev, cmd); + if (error < 0) + return error; + + /* + * If we are in the middle of error recovery, don't let anyone + * else try and use this device. Also, if error recovery fails, it + * may try and take the device offline, in which case all further + * access to the device is prohibited. + */ + error = scsi_ioctl_block_when_processing_errors(sdp, cmd, + (mode & FMODE_NDELAY) != 0); + if (error) + goto out; + + /* + * Send SCSI addressing ioctls directly to mid level, send other + * ioctls to block level and then onto mid level if they can't be + * resolved. + */ + switch (cmd) { + case SCSI_IOCTL_GET_IDLUN: + case SCSI_IOCTL_GET_BUS_NUMBER: + error = scsi_ioctl(sdp, cmd, p); + break; + default: + error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); + if (error != -ENOTTY) + break; + error = scsi_ioctl(sdp, cmd, p); + break; + } +out: + return error; +} + +static void set_media_not_present(struct scsi_disk *sdkp) +{ + if (sdkp->media_present) + sdkp->device->changed = 1; + + if (sdkp->device->removable) { + sdkp->media_present = 0; + sdkp->capacity = 0; + } +} + +static int media_not_present(struct scsi_disk *sdkp, + struct scsi_sense_hdr *sshdr) +{ + if (!scsi_sense_valid(sshdr)) + return 0; + + /* not invoked for commands that could return deferred errors */ + switch (sshdr->sense_key) { + case UNIT_ATTENTION: + case NOT_READY: + /* medium not present */ + if (sshdr->asc == 0x3A) { + set_media_not_present(sdkp); + return 1; + } + } + return 0; +} + +/** + * sd_check_events - check media events + * @disk: kernel device descriptor + * @clearing: disk events currently being cleared + * + * Returns mask of DISK_EVENT_*. + * + * Note: this function is invoked from the block subsystem. + **/ +static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + struct scsi_device *sdp = sdkp->device; + struct scsi_sense_hdr *sshdr = NULL; + int retval; + + SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); + + /* + * If the device is offline, don't send any commands - just pretend as + * if the command failed. If the device ever comes back online, we + * can deal with it then. It is only because of unrecoverable errors + * that we would ever take a device offline in the first place. + */ + if (!scsi_device_online(sdp)) { + set_media_not_present(sdkp); + goto out; + } + + /* + * Using TEST_UNIT_READY enables differentiation between drive with + * no cartridge loaded - NOT READY, drive with changed cartridge - + * UNIT ATTENTION, or with same cartridge - GOOD STATUS. + * + * Drives that auto spin down. eg iomega jaz 1G, will be started + * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever + * sd_revalidate() is called. + */ + retval = -ENODEV; + + if (scsi_block_when_processing_errors(sdp)) { + sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); + retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, + sshdr); + } + + /* failed to execute TUR, assume media not present */ + if (host_byte(retval)) { + set_media_not_present(sdkp); + goto out; + } + + if (media_not_present(sdkp, sshdr)) + goto out; + + /* + * For removable scsi disk we have to recognise the presence + * of a disk in the drive. + */ + if (!sdkp->media_present) + sdp->changed = 1; + sdkp->media_present = 1; +out: + /* + * sdp->changed is set under the following conditions: + * + * Medium present state has changed in either direction. + * Device has indicated UNIT_ATTENTION. + */ + kfree(sshdr); + retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; + sdp->changed = 0; + return retval; +} + +static int sd_sync_cache(struct scsi_disk *sdkp) +{ + int retries, res; + struct scsi_device *sdp = sdkp->device; + const int timeout = sdp->request_queue->rq_timeout + * SD_FLUSH_TIMEOUT_MULTIPLIER; + struct scsi_sense_hdr sshdr; + + if (!scsi_device_online(sdp)) + return -ENODEV; + + for (retries = 3; retries > 0; --retries) { + unsigned char cmd[10] = { 0 }; + + cmd[0] = SYNCHRONIZE_CACHE; + /* + * Leave the rest of the command zero to indicate + * flush everything. + */ + res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, + &sshdr, timeout, SD_MAX_RETRIES, + NULL, REQ_PM); + if (res == 0) + break; + } + + if (res) { + sd_print_result(sdkp, "Synchronize Cache(10) failed", res); + + if (driver_byte(res) & DRIVER_SENSE) + sd_print_sense_hdr(sdkp, &sshdr); + /* we need to evaluate the error return */ + if (scsi_sense_valid(&sshdr) && + (sshdr.asc == 0x3a || /* medium not present */ + sshdr.asc == 0x20)) /* invalid command */ + /* this is no error here */ + return 0; + + switch (host_byte(res)) { + /* ignore errors due to racing a disconnection */ + case DID_BAD_TARGET: + case DID_NO_CONNECT: + return 0; + /* signal the upper layer it might try again */ + case DID_BUS_BUSY: + case DID_IMM_RETRY: + case DID_REQUEUE: + case DID_SOFT_ERROR: + return -EBUSY; + default: + return -EIO; + } + } + return 0; +} + +static void sd_rescan(struct device *dev) +{ + struct scsi_disk *sdkp = dev_get_drvdata(dev); + + revalidate_disk(sdkp->disk); +} + + +#ifdef CONFIG_COMPAT +/* + * This gets directly called from VFS. When the ioctl + * is not recognized we go back to the other translation paths. + */ +static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; + int error; + + error = scsi_ioctl_block_when_processing_errors(sdev, cmd, + (mode & FMODE_NDELAY) != 0); + if (error) + return error; + + /* + * Let the static ioctl translation table take care of it. + */ + if (!sdev->host->hostt->compat_ioctl) + return -ENOIOCTLCMD; + return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); +} +#endif + +static const struct block_device_operations sd_fops = { + .owner = THIS_MODULE, + .open = sd_open, + .release = sd_release, + .ioctl = sd_ioctl, + .getgeo = sd_getgeo, +#ifdef CONFIG_COMPAT + .compat_ioctl = sd_compat_ioctl, +#endif + .check_events = sd_check_events, + .revalidate_disk = sd_revalidate_disk, + .unlock_native_capacity = sd_unlock_native_capacity, +}; + +/** + * sd_eh_action - error handling callback + * @scmd: sd-issued command that has failed + * @eh_disp: The recovery disposition suggested by the midlayer + * + * This function is called by the SCSI midlayer upon completion of an + * error test command (currently TEST UNIT READY). The result of sending + * the eh command is passed in eh_disp. We're looking for devices that + * fail medium access commands but are OK with non access commands like + * test unit ready (so wrongly see the device as having a successful + * recovery) + **/ +static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) +{ + struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); + + if (!scsi_device_online(scmd->device) || + !scsi_medium_access_command(scmd) || + host_byte(scmd->result) != DID_TIME_OUT || + eh_disp != SUCCESS) + return eh_disp; + + /* + * The device has timed out executing a medium access command. + * However, the TEST UNIT READY command sent during error + * handling completed successfully. Either the device is in the + * process of recovering or has it suffered an internal failure + * that prevents access to the storage medium. + */ + sdkp->medium_access_timed_out++; + + /* + * If the device keeps failing read/write commands but TEST UNIT + * READY always completes successfully we assume that medium + * access is no longer possible and take the device offline. + */ + if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { + scmd_printk(KERN_ERR, scmd, + "Medium access timeout failure. Offlining disk!\n"); + scsi_device_set_state(scmd->device, SDEV_OFFLINE); + + return FAILED; + } + + return eh_disp; +} + +static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) +{ + u64 start_lba = blk_rq_pos(scmd->request); + u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); + u64 factor = scmd->device->sector_size / 512; + u64 bad_lba; + int info_valid; + /* + * resid is optional but mostly filled in. When it's unused, + * its value is zero, so we assume the whole buffer transferred + */ + unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); + unsigned int good_bytes; + + if (scmd->request->cmd_type != REQ_TYPE_FS) + return 0; + + info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, + SCSI_SENSE_BUFFERSIZE, + &bad_lba); + if (!info_valid) + return 0; + + if (scsi_bufflen(scmd) <= scmd->device->sector_size) + return 0; + + /* be careful ... don't want any overflows */ + do_div(start_lba, factor); + do_div(end_lba, factor); + + /* The bad lba was reported incorrectly, we have no idea where + * the error is. + */ + if (bad_lba < start_lba || bad_lba >= end_lba) + return 0; + + /* This computation should always be done in terms of + * the resolution of the device's medium. + */ + good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; + return min(good_bytes, transferred); +} + +/** + * sd_done - bottom half handler: called when the lower level + * driver has completed (successfully or otherwise) a scsi command. + * @SCpnt: mid-level's per command structure. + * + * Note: potentially run from within an ISR. Must not block. + **/ +static int sd_done(struct scsi_cmnd *SCpnt) +{ + int result = SCpnt->result; + unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); + struct scsi_sense_hdr sshdr; + struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); + struct request *req = SCpnt->request; + int sense_valid = 0; + int sense_deferred = 0; + unsigned char op = SCpnt->cmnd[0]; + unsigned char unmap = SCpnt->cmnd[1] & 8; + + if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { + if (!result) { + good_bytes = blk_rq_bytes(req); + scsi_set_resid(SCpnt, 0); + } else { + good_bytes = 0; + scsi_set_resid(SCpnt, blk_rq_bytes(req)); + } + } + + if (result) { + sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); + if (sense_valid) + sense_deferred = scsi_sense_is_deferred(&sshdr); + } + sdkp->medium_access_timed_out = 0; + + if (driver_byte(result) != DRIVER_SENSE && + (!sense_valid || sense_deferred)) + goto out; + + switch (sshdr.sense_key) { + case HARDWARE_ERROR: + case MEDIUM_ERROR: + good_bytes = sd_completed_bytes(SCpnt); + break; + case RECOVERED_ERROR: + good_bytes = scsi_bufflen(SCpnt); + break; + case NO_SENSE: + /* This indicates a false check condition, so ignore it. An + * unknown amount of data was transferred so treat it as an + * error. + */ + SCpnt->result = 0; + memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); + break; + case ABORTED_COMMAND: + if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ + good_bytes = sd_completed_bytes(SCpnt); + break; + case ILLEGAL_REQUEST: + if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ + good_bytes = sd_completed_bytes(SCpnt); + /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ + if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { + switch (op) { + case UNMAP: + sd_config_discard(sdkp, SD_LBP_DISABLE); + break; + case WRITE_SAME_16: + case WRITE_SAME: + if (unmap) + sd_config_discard(sdkp, SD_LBP_DISABLE); + else { + sdkp->device->no_write_same = 1; + sd_config_write_same(sdkp); + + good_bytes = 0; + req->__data_len = blk_rq_bytes(req); + req->cmd_flags |= REQ_QUIET; + } + } + } + break; + default: + break; + } + out: + SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, + "sd_done: completed %d of %d bytes\n", + good_bytes, scsi_bufflen(SCpnt))); + + if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) + sd_dif_complete(SCpnt, good_bytes); + + return good_bytes; +} + +/* + * spinup disk - called only in sd_revalidate_disk() + */ +static void +sd_spinup_disk(struct scsi_disk *sdkp) +{ + unsigned char cmd[10]; + unsigned long spintime_expire = 0; + int retries, spintime; + unsigned int the_result; + struct scsi_sense_hdr sshdr; + int sense_valid = 0; + + spintime = 0; + + /* Spin up drives, as required. Only do this at boot time */ + /* Spinup needs to be done for module loads too. */ + do { + retries = 0; + + do { + cmd[0] = TEST_UNIT_READY; + memset((void *) &cmd[1], 0, 9); + + the_result = scsi_execute_req(sdkp->device, cmd, + DMA_NONE, NULL, 0, + &sshdr, SD_TIMEOUT, + SD_MAX_RETRIES, NULL); + + /* + * If the drive has indicated to us that it + * doesn't have any media in it, don't bother + * with any more polling. + */ + if (media_not_present(sdkp, &sshdr)) + return; + + if (the_result) + sense_valid = scsi_sense_valid(&sshdr); + retries++; + } while (retries < 3 && + (!scsi_status_is_good(the_result) || + ((driver_byte(the_result) & DRIVER_SENSE) && + sense_valid && sshdr.sense_key == UNIT_ATTENTION))); + + if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { + /* no sense, TUR either succeeded or failed + * with a status error */ + if(!spintime && !scsi_status_is_good(the_result)) { + sd_print_result(sdkp, "Test Unit Ready failed", + the_result); + } + break; + } + + /* + * The device does not want the automatic start to be issued. + */ + if (sdkp->device->no_start_on_add) + break; + + if (sense_valid && sshdr.sense_key == NOT_READY) { + if (sshdr.asc == 4 && sshdr.ascq == 3) + break; /* manual intervention required */ + if (sshdr.asc == 4 && sshdr.ascq == 0xb) + break; /* standby */ + if (sshdr.asc == 4 && sshdr.ascq == 0xc) + break; /* unavailable */ + /* + * Issue command to spin up drive when not ready + */ + if (!spintime) { + sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); + cmd[0] = START_STOP; + cmd[1] = 1; /* Return immediately */ + memset((void *) &cmd[2], 0, 8); + cmd[4] = 1; /* Start spin cycle */ + if (sdkp->device->start_stop_pwr_cond) + cmd[4] |= 1 << 4; + scsi_execute_req(sdkp->device, cmd, DMA_NONE, + NULL, 0, &sshdr, + SD_TIMEOUT, SD_MAX_RETRIES, + NULL); + spintime_expire = jiffies + 100 * HZ; + spintime = 1; + } + /* Wait 1 second for next try */ + msleep(1000); + printk("."); + + /* + * Wait for USB flash devices with slow firmware. + * Yes, this sense key/ASC combination shouldn't + * occur here. It's characteristic of these devices. + */ + } else if (sense_valid && + sshdr.sense_key == UNIT_ATTENTION && + sshdr.asc == 0x28) { + if (!spintime) { + spintime_expire = jiffies + 5 * HZ; + spintime = 1; + } + /* Wait 1 second for next try */ + msleep(1000); + } else { + /* we don't understand the sense code, so it's + * probably pointless to loop */ + if(!spintime) { + sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); + sd_print_sense_hdr(sdkp, &sshdr); + } + break; + } + + } while (spintime && time_before_eq(jiffies, spintime_expire)); + + if (spintime) { + if (scsi_status_is_good(the_result)) + printk("ready\n"); + else + printk("not responding...\n"); + } +} + + +/* + * Determine whether disk supports Data Integrity Field. + */ +static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) +{ + struct scsi_device *sdp = sdkp->device; + u8 type; + int ret = 0; + + if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) + return ret; + + type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ + + if (type > SD_DIF_TYPE3_PROTECTION) + ret = -ENODEV; + else if (scsi_host_dif_capable(sdp->host, type)) + ret = 1; + + if (sdkp->first_scan || type != sdkp->protection_type) + switch (ret) { + case -ENODEV: + sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ + " protection type %u. Disabling disk!\n", + type); + break; + case 1: + sd_printk(KERN_NOTICE, sdkp, + "Enabling DIF Type %u protection\n", type); + break; + case 0: + sd_printk(KERN_NOTICE, sdkp, + "Disabling DIF Type %u protection\n", type); + break; + } + + sdkp->protection_type = type; + + return ret; +} + +static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, + struct scsi_sense_hdr *sshdr, int sense_valid, + int the_result) +{ + if (driver_byte(the_result) & DRIVER_SENSE) + sd_print_sense_hdr(sdkp, sshdr); + else + sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); + + /* + * Set dirty bit for removable devices if not ready - + * sometimes drives will not report this properly. + */ + if (sdp->removable && + sense_valid && sshdr->sense_key == NOT_READY) + set_media_not_present(sdkp); + + /* + * We used to set media_present to 0 here to indicate no media + * in the drive, but some drives fail read capacity even with + * media present, so we can't do that. + */ + sdkp->capacity = 0; /* unknown mapped to zero - as usual */ +} + +#define RC16_LEN 32 +#if RC16_LEN > SD_BUF_SIZE +#error RC16_LEN must not be more than SD_BUF_SIZE +#endif + +#define READ_CAPACITY_RETRIES_ON_RESET 10 + +static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, + unsigned char *buffer) +{ + unsigned char cmd[16]; + struct scsi_sense_hdr sshdr; + int sense_valid = 0; + int the_result; + int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; + unsigned int alignment; + unsigned long long lba; + unsigned sector_size; + + if (sdp->no_read_capacity_16) + return -EINVAL; + + do { + memset(cmd, 0, 16); + cmd[0] = SERVICE_ACTION_IN_16; + cmd[1] = SAI_READ_CAPACITY_16; + cmd[13] = RC16_LEN; + memset(buffer, 0, RC16_LEN); + + the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, + buffer, RC16_LEN, &sshdr, + SD_TIMEOUT, SD_MAX_RETRIES, NULL); + + if (media_not_present(sdkp, &sshdr)) + return -ENODEV; + + if (the_result) { + sense_valid = scsi_sense_valid(&sshdr); + if (sense_valid && + sshdr.sense_key == ILLEGAL_REQUEST && + (sshdr.asc == 0x20 || sshdr.asc == 0x24) && + sshdr.ascq == 0x00) + /* Invalid Command Operation Code or + * Invalid Field in CDB, just retry + * silently with RC10 */ + return -EINVAL; + if (sense_valid && + sshdr.sense_key == UNIT_ATTENTION && + sshdr.asc == 0x29 && sshdr.ascq == 0x00) + /* Device reset might occur several times, + * give it one more chance */ + if (--reset_retries > 0) + continue; + } + retries--; + + } while (the_result && retries); + + if (the_result) { + sd_print_result(sdkp, "Read Capacity(16) failed", the_result); + read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); + return -EINVAL; + } + + sector_size = get_unaligned_be32(&buffer[8]); + lba = get_unaligned_be64(&buffer[0]); + + if (sd_read_protection_type(sdkp, buffer) < 0) { + sdkp->capacity = 0; + return -ENODEV; + } + + if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { + sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " + "kernel compiled with support for large block " + "devices.\n"); + sdkp->capacity = 0; + return -EOVERFLOW; + } + + /* Logical blocks per physical block exponent */ + sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; + + /* Lowest aligned logical block */ + alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; + blk_queue_alignment_offset(sdp->request_queue, alignment); + if (alignment && sdkp->first_scan) + sd_printk(KERN_NOTICE, sdkp, + "physical block alignment offset: %u\n", alignment); + + if (buffer[14] & 0x80) { /* LBPME */ + sdkp->lbpme = 1; + + if (buffer[14] & 0x40) /* LBPRZ */ + sdkp->lbprz = 1; + + sd_config_discard(sdkp, SD_LBP_WS16); + } + + sdkp->capacity = lba + 1; + return sector_size; +} + +static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, + unsigned char *buffer) +{ + unsigned char cmd[16]; + struct scsi_sense_hdr sshdr; + int sense_valid = 0; + int the_result; + int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; + sector_t lba; + unsigned sector_size; + + do { + cmd[0] = READ_CAPACITY; + memset(&cmd[1], 0, 9); + memset(buffer, 0, 8); + + the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, + buffer, 8, &sshdr, + SD_TIMEOUT, SD_MAX_RETRIES, NULL); + + if (media_not_present(sdkp, &sshdr)) + return -ENODEV; + + if (the_result) { + sense_valid = scsi_sense_valid(&sshdr); + if (sense_valid && + sshdr.sense_key == UNIT_ATTENTION && + sshdr.asc == 0x29 && sshdr.ascq == 0x00) + /* Device reset might occur several times, + * give it one more chance */ + if (--reset_retries > 0) + continue; + } + retries--; + + } while (the_result && retries); + + if (the_result) { + sd_print_result(sdkp, "Read Capacity(10) failed", the_result); + read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); + return -EINVAL; + } + + sector_size = get_unaligned_be32(&buffer[4]); + lba = get_unaligned_be32(&buffer[0]); + + if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { + /* Some buggy (usb cardreader) devices return an lba of + 0xffffffff when the want to report a size of 0 (with + which they really mean no media is present) */ + sdkp->capacity = 0; + sdkp->physical_block_size = sector_size; + return sector_size; + } + + if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { + sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " + "kernel compiled with support for large block " + "devices.\n"); + sdkp->capacity = 0; + return -EOVERFLOW; + } + + sdkp->capacity = lba + 1; + sdkp->physical_block_size = sector_size; + return sector_size; +} + +static int sd_try_rc16_first(struct scsi_device *sdp) +{ + if (sdp->host->max_cmd_len < 16) + return 0; + if (sdp->try_rc_10_first) + return 0; + if (sdp->scsi_level > SCSI_SPC_2) + return 1; + if (scsi_device_protection(sdp)) + return 1; + return 0; +} + +/* + * read disk capacity + */ +static void +sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) +{ + int sector_size; + struct scsi_device *sdp = sdkp->device; + sector_t old_capacity = sdkp->capacity; + + if (sd_try_rc16_first(sdp)) { + sector_size = read_capacity_16(sdkp, sdp, buffer); + if (sector_size == -EOVERFLOW) + goto got_data; + if (sector_size == -ENODEV) + return; + if (sector_size < 0) + sector_size = read_capacity_10(sdkp, sdp, buffer); + if (sector_size < 0) + return; + } else { + sector_size = read_capacity_10(sdkp, sdp, buffer); + if (sector_size == -EOVERFLOW) + goto got_data; + if (sector_size < 0) + return; + if ((sizeof(sdkp->capacity) > 4) && + (sdkp->capacity > 0xffffffffULL)) { + int old_sector_size = sector_size; + sd_printk(KERN_NOTICE, sdkp, "Very big device. " + "Trying to use READ CAPACITY(16).\n"); + sector_size = read_capacity_16(sdkp, sdp, buffer); + if (sector_size < 0) { + sd_printk(KERN_NOTICE, sdkp, + "Using 0xffffffff as device size\n"); + sdkp->capacity = 1 + (sector_t) 0xffffffff; + sector_size = old_sector_size; + goto got_data; + } + } + } + + /* Some devices are known to return the total number of blocks, + * not the highest block number. Some devices have versions + * which do this and others which do not. Some devices we might + * suspect of doing this but we don't know for certain. + * + * If we know the reported capacity is wrong, decrement it. If + * we can only guess, then assume the number of blocks is even + * (usually true but not always) and err on the side of lowering + * the capacity. + */ + if (sdp->fix_capacity || + (sdp->guess_capacity && (sdkp->capacity & 0x01))) { + sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " + "from its reported value: %llu\n", + (unsigned long long) sdkp->capacity); + --sdkp->capacity; + } + +got_data: + if (sector_size == 0) { + sector_size = 512; + sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " + "assuming 512.\n"); + } + + if (sector_size != 512 && + sector_size != 1024 && + sector_size != 2048 && + sector_size != 4096) { + sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", + sector_size); + /* + * The user might want to re-format the drive with + * a supported sectorsize. Once this happens, it + * would be relatively trivial to set the thing up. + * For this reason, we leave the thing in the table. + */ + sdkp->capacity = 0; + /* + * set a bogus sector size so the normal read/write + * logic in the block layer will eventually refuse any + * request on this device without tripping over power + * of two sector size assumptions + */ + sector_size = 512; + } + blk_queue_logical_block_size(sdp->request_queue, sector_size); + + { + char cap_str_2[10], cap_str_10[10]; + + string_get_size(sdkp->capacity, sector_size, + STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); + string_get_size(sdkp->capacity, sector_size, + STRING_UNITS_10, cap_str_10, + sizeof(cap_str_10)); + + if (sdkp->first_scan || old_capacity != sdkp->capacity) { + sd_printk(KERN_NOTICE, sdkp, + "%llu %d-byte logical blocks: (%s/%s)\n", + (unsigned long long)sdkp->capacity, + sector_size, cap_str_10, cap_str_2); + + if (sdkp->physical_block_size != sector_size) + sd_printk(KERN_NOTICE, sdkp, + "%u-byte physical blocks\n", + sdkp->physical_block_size); + } + } + + if (sdkp->capacity > 0xffffffff) { + sdp->use_16_for_rw = 1; + sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS; + } else + sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS; + + /* Rescale capacity to 512-byte units */ + if (sector_size == 4096) + sdkp->capacity <<= 3; + else if (sector_size == 2048) + sdkp->capacity <<= 2; + else if (sector_size == 1024) + sdkp->capacity <<= 1; + + blk_queue_physical_block_size(sdp->request_queue, + sdkp->physical_block_size); + sdkp->device->sector_size = sector_size; +} + +/* called with buffer of length 512 */ +static inline int +sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, + unsigned char *buffer, int len, struct scsi_mode_data *data, + struct scsi_sense_hdr *sshdr) +{ + return scsi_mode_sense(sdp, dbd, modepage, buffer, len, + SD_TIMEOUT, SD_MAX_RETRIES, data, + sshdr); +} + +/* + * read write protect setting, if possible - called only in sd_revalidate_disk() + * called with buffer of length SD_BUF_SIZE + */ +static void +sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) +{ + int res; + struct scsi_device *sdp = sdkp->device; + struct scsi_mode_data data; + int old_wp = sdkp->write_prot; + + set_disk_ro(sdkp->disk, 0); + if (sdp->skip_ms_page_3f) { + sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); + return; + } + + if (sdp->use_192_bytes_for_3f) { + res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); + } else { + /* + * First attempt: ask for all pages (0x3F), but only 4 bytes. + * We have to start carefully: some devices hang if we ask + * for more than is available. + */ + res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); + + /* + * Second attempt: ask for page 0 When only page 0 is + * implemented, a request for page 3F may return Sense Key + * 5: Illegal Request, Sense Code 24: Invalid field in + * CDB. + */ + if (!scsi_status_is_good(res)) + res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); + + /* + * Third attempt: ask 255 bytes, as we did earlier. + */ + if (!scsi_status_is_good(res)) + res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, + &data, NULL); + } + + if (!scsi_status_is_good(res)) { + sd_first_printk(KERN_WARNING, sdkp, + "Test WP failed, assume Write Enabled\n"); + } else { + sdkp->write_prot = ((data.device_specific & 0x80) != 0); + set_disk_ro(sdkp->disk, sdkp->write_prot); + if (sdkp->first_scan || old_wp != sdkp->write_prot) { + sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", + sdkp->write_prot ? "on" : "off"); + sd_printk(KERN_DEBUG, sdkp, + "Mode Sense: %02x %02x %02x %02x\n", + buffer[0], buffer[1], buffer[2], buffer[3]); + } + } +} + +/* + * sd_read_cache_type - called only from sd_revalidate_disk() + * called with buffer of length SD_BUF_SIZE + */ +static void +sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) +{ + int len = 0, res; + struct scsi_device *sdp = sdkp->device; + + int dbd; + int modepage; + int first_len; + struct scsi_mode_data data; + struct scsi_sense_hdr sshdr; + int old_wce = sdkp->WCE; + int old_rcd = sdkp->RCD; + int old_dpofua = sdkp->DPOFUA; + + + if (sdkp->cache_override) + return; + + first_len = 4; + if (sdp->skip_ms_page_8) { + if (sdp->type == TYPE_RBC) + goto defaults; + else { + if (sdp->skip_ms_page_3f) + goto defaults; + modepage = 0x3F; + if (sdp->use_192_bytes_for_3f) + first_len = 192; + dbd = 0; + } + } else if (sdp->type == TYPE_RBC) { + modepage = 6; + dbd = 8; + } else { + modepage = 8; + dbd = 0; + } + + /* cautiously ask */ + res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, + &data, &sshdr); + + if (!scsi_status_is_good(res)) + goto bad_sense; + + if (!data.header_length) { + modepage = 6; + first_len = 0; + sd_first_printk(KERN_ERR, sdkp, + "Missing header in MODE_SENSE response\n"); + } + + /* that went OK, now ask for the proper length */ + len = data.length; + + /* + * We're only interested in the first three bytes, actually. + * But the data cache page is defined for the first 20. + */ + if (len < 3) + goto bad_sense; + else if (len > SD_BUF_SIZE) { + sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " + "data from %d to %d bytes\n", len, SD_BUF_SIZE); + len = SD_BUF_SIZE; + } + if (modepage == 0x3F && sdp->use_192_bytes_for_3f) + len = 192; + + /* Get the data */ + if (len > first_len) + res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, + &data, &sshdr); + + if (scsi_status_is_good(res)) { + int offset = data.header_length + data.block_descriptor_length; + + while (offset < len) { + u8 page_code = buffer[offset] & 0x3F; + u8 spf = buffer[offset] & 0x40; + + if (page_code == 8 || page_code == 6) { + /* We're interested only in the first 3 bytes. + */ + if (len - offset <= 2) { + sd_first_printk(KERN_ERR, sdkp, + "Incomplete mode parameter " + "data\n"); + goto defaults; + } else { + modepage = page_code; + goto Page_found; + } + } else { + /* Go to the next page */ + if (spf && len - offset > 3) + offset += 4 + (buffer[offset+2] << 8) + + buffer[offset+3]; + else if (!spf && len - offset > 1) + offset += 2 + buffer[offset+1]; + else { + sd_first_printk(KERN_ERR, sdkp, + "Incomplete mode " + "parameter data\n"); + goto defaults; + } + } + } + + sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); + goto defaults; + + Page_found: + if (modepage == 8) { + sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); + sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); + } else { + sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); + sdkp->RCD = 0; + } + + sdkp->DPOFUA = (data.device_specific & 0x10) != 0; + if (sdp->broken_fua) { + sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); + sdkp->DPOFUA = 0; + } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { + sd_first_printk(KERN_NOTICE, sdkp, + "Uses READ/WRITE(6), disabling FUA\n"); + sdkp->DPOFUA = 0; + } + + /* No cache flush allowed for write protected devices */ + if (sdkp->WCE && sdkp->write_prot) + sdkp->WCE = 0; + + if (sdkp->first_scan || old_wce != sdkp->WCE || + old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) + sd_printk(KERN_NOTICE, sdkp, + "Write cache: %s, read cache: %s, %s\n", + sdkp->WCE ? "enabled" : "disabled", + sdkp->RCD ? "disabled" : "enabled", + sdkp->DPOFUA ? "supports DPO and FUA" + : "doesn't support DPO or FUA"); + + return; + } + +bad_sense: + if (scsi_sense_valid(&sshdr) && + sshdr.sense_key == ILLEGAL_REQUEST && + sshdr.asc == 0x24 && sshdr.ascq == 0x0) + /* Invalid field in CDB */ + sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); + else + sd_first_printk(KERN_ERR, sdkp, + "Asking for cache data failed\n"); + +defaults: + if (sdp->wce_default_on) { + sd_first_printk(KERN_NOTICE, sdkp, + "Assuming drive cache: write back\n"); + sdkp->WCE = 1; + } else { + sd_first_printk(KERN_ERR, sdkp, + "Assuming drive cache: write through\n"); + sdkp->WCE = 0; + } + sdkp->RCD = 0; + sdkp->DPOFUA = 0; +} + +/* + * The ATO bit indicates whether the DIF application tag is available + * for use by the operating system. + */ +static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) +{ + int res, offset; + struct scsi_device *sdp = sdkp->device; + struct scsi_mode_data data; + struct scsi_sense_hdr sshdr; + + if (sdp->type != TYPE_DISK) + return; + + if (sdkp->protection_type == 0) + return; + + res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, + SD_MAX_RETRIES, &data, &sshdr); + + if (!scsi_status_is_good(res) || !data.header_length || + data.length < 6) { + sd_first_printk(KERN_WARNING, sdkp, + "getting Control mode page failed, assume no ATO\n"); + + if (scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + + return; + } + + offset = data.header_length + data.block_descriptor_length; + + if ((buffer[offset] & 0x3f) != 0x0a) { + sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); + return; + } + + if ((buffer[offset + 5] & 0x80) == 0) + return; + + sdkp->ATO = 1; + + return; +} + +/** + * sd_read_block_limits - Query disk device for preferred I/O sizes. + * @disk: disk to query + */ +static void sd_read_block_limits(struct scsi_disk *sdkp) +{ + unsigned int sector_sz = sdkp->device->sector_size; + const int vpd_len = 64; + u32 max_xfer_length; + unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); + + if (!buffer || + /* Block Limits VPD */ + scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) + goto out; + + max_xfer_length = get_unaligned_be32(&buffer[8]); + if (max_xfer_length) + sdkp->max_xfer_blocks = max_xfer_length; + + blk_queue_io_min(sdkp->disk->queue, + get_unaligned_be16(&buffer[6]) * sector_sz); + blk_queue_io_opt(sdkp->disk->queue, + get_unaligned_be32(&buffer[12]) * sector_sz); + + if (buffer[3] == 0x3c) { + unsigned int lba_count, desc_count; + + sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); + + if (!sdkp->lbpme) + goto out; + + lba_count = get_unaligned_be32(&buffer[20]); + desc_count = get_unaligned_be32(&buffer[24]); + + if (lba_count && desc_count) + sdkp->max_unmap_blocks = lba_count; + + sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); + + if (buffer[32] & 0x80) + sdkp->unmap_alignment = + get_unaligned_be32(&buffer[32]) & ~(1 << 31); + + if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ + + if (sdkp->max_unmap_blocks) + sd_config_discard(sdkp, SD_LBP_UNMAP); + else + sd_config_discard(sdkp, SD_LBP_WS16); + + } else { /* LBP VPD page tells us what to use */ + if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz) + sd_config_discard(sdkp, SD_LBP_UNMAP); + else if (sdkp->lbpws) + sd_config_discard(sdkp, SD_LBP_WS16); + else if (sdkp->lbpws10) + sd_config_discard(sdkp, SD_LBP_WS10); + else if (sdkp->lbpu && sdkp->max_unmap_blocks) + sd_config_discard(sdkp, SD_LBP_UNMAP); + else + sd_config_discard(sdkp, SD_LBP_DISABLE); + } + } + + out: + kfree(buffer); +} + +/** + * sd_read_block_characteristics - Query block dev. characteristics + * @disk: disk to query + */ +static void sd_read_block_characteristics(struct scsi_disk *sdkp) +{ + unsigned char *buffer; + u16 rot; + const int vpd_len = 64; + + buffer = kmalloc(vpd_len, GFP_KERNEL); + + if (!buffer || + /* Block Device Characteristics VPD */ + scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) + goto out; + + rot = get_unaligned_be16(&buffer[4]); + + if (rot == 1) { + queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); + queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue); + } + + out: + kfree(buffer); +} + +/** + * sd_read_block_provisioning - Query provisioning VPD page + * @disk: disk to query + */ +static void sd_read_block_provisioning(struct scsi_disk *sdkp) +{ + unsigned char *buffer; + const int vpd_len = 8; + + if (sdkp->lbpme == 0) + return; + + buffer = kmalloc(vpd_len, GFP_KERNEL); + + if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) + goto out; + + sdkp->lbpvpd = 1; + sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ + sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ + sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ + + out: + kfree(buffer); +} + +static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) +{ + struct scsi_device *sdev = sdkp->device; + + if (sdev->host->no_write_same) { + sdev->no_write_same = 1; + + return; + } + + if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { + /* too large values might cause issues with arcmsr */ + int vpd_buf_len = 64; + + sdev->no_report_opcodes = 1; + + /* Disable WRITE SAME if REPORT SUPPORTED OPERATION + * CODES is unsupported and the device has an ATA + * Information VPD page (SAT). + */ + if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) + sdev->no_write_same = 1; + } + + if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) + sdkp->ws16 = 1; + + if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) + sdkp->ws10 = 1; +} + +static int sd_try_extended_inquiry(struct scsi_device *sdp) +{ + /* Attempt VPD inquiry if the device blacklist explicitly calls + * for it. + */ + if (sdp->try_vpd_pages) + return 1; + /* + * Although VPD inquiries can go to SCSI-2 type devices, + * some USB ones crash on receiving them, and the pages + * we currently ask for are for SPC-3 and beyond + */ + if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) + return 1; + return 0; +} + +/** + * sd_revalidate_disk - called the first time a new disk is seen, + * performs disk spin up, read_capacity, etc. + * @disk: struct gendisk we care about + **/ +static int sd_revalidate_disk(struct gendisk *disk) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + struct scsi_device *sdp = sdkp->device; + unsigned char *buffer; + unsigned int max_xfer; + + SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, + "sd_revalidate_disk\n")); + + /* + * If the device is offline, don't try and read capacity or any + * of the other niceties. + */ + if (!scsi_device_online(sdp)) + goto out; + + buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); + if (!buffer) { + sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " + "allocation failure.\n"); + goto out; + } + + sd_spinup_disk(sdkp); + + /* + * Without media there is no reason to ask; moreover, some devices + * react badly if we do. + */ + if (sdkp->media_present) { + sd_read_capacity(sdkp, buffer); + + if (sd_try_extended_inquiry(sdp)) { + sd_read_block_provisioning(sdkp); + sd_read_block_limits(sdkp); + sd_read_block_characteristics(sdkp); + } + + sd_read_write_protect_flag(sdkp, buffer); + sd_read_cache_type(sdkp, buffer); + sd_read_app_tag_own(sdkp, buffer); + sd_read_write_same(sdkp, buffer); + } + + sdkp->first_scan = 0; + + /* + * We now have all cache related info, determine how we deal + * with flush requests. + */ + sd_set_flush_flag(sdkp); + + max_xfer = sdkp->max_xfer_blocks; + max_xfer <<= ilog2(sdp->sector_size) - 9; + + max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), + max_xfer); + blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer); + set_capacity(disk, sdkp->capacity); + sd_config_write_same(sdkp); + kfree(buffer); + + out: + return 0; +} + +/** + * sd_unlock_native_capacity - unlock native capacity + * @disk: struct gendisk to set capacity for + * + * Block layer calls this function if it detects that partitions + * on @disk reach beyond the end of the device. If the SCSI host + * implements ->unlock_native_capacity() method, it's invoked to + * give it a chance to adjust the device capacity. + * + * CONTEXT: + * Defined by block layer. Might sleep. + */ +static void sd_unlock_native_capacity(struct gendisk *disk) +{ + struct scsi_device *sdev = scsi_disk(disk)->device; + + if (sdev->host->hostt->unlock_native_capacity) + sdev->host->hostt->unlock_native_capacity(sdev); +} + +/** + * sd_format_disk_name - format disk name + * @prefix: name prefix - ie. "sd" for SCSI disks + * @index: index of the disk to format name for + * @buf: output buffer + * @buflen: length of the output buffer + * + * SCSI disk names starts at sda. The 26th device is sdz and the + * 27th is sdaa. The last one for two lettered suffix is sdzz + * which is followed by sdaaa. + * + * This is basically 26 base counting with one extra 'nil' entry + * at the beginning from the second digit on and can be + * determined using similar method as 26 base conversion with the + * index shifted -1 after each digit is computed. + * + * CONTEXT: + * Don't care. + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) +{ + const int base = 'z' - 'a' + 1; + char *begin = buf + strlen(prefix); + char *end = buf + buflen; + char *p; + int unit; + + p = end - 1; + *p = '\0'; + unit = base; + do { + if (p == begin) + return -EINVAL; + *--p = 'a' + (index % unit); + index = (index / unit) - 1; + } while (index >= 0); + + memmove(begin, p, end - p); + memcpy(buf, prefix, strlen(prefix)); + + return 0; +} + +/* + * The asynchronous part of sd_probe + */ +static void sd_probe_async(void *data, async_cookie_t cookie) +{ + struct scsi_disk *sdkp = data; + struct scsi_device *sdp; + struct gendisk *gd; + u32 index; + struct device *dev; + + sdp = sdkp->device; + gd = sdkp->disk; + index = sdkp->index; + dev = &sdp->sdev_gendev; + + gd->major = sd_major((index & 0xf0) >> 4); + gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); + gd->minors = SD_MINORS; + + gd->fops = &sd_fops; + gd->private_data = &sdkp->driver; + gd->queue = sdkp->device->request_queue; + + /* defaults, until the device tells us otherwise */ + sdp->sector_size = 512; + sdkp->capacity = 0; + sdkp->media_present = 1; + sdkp->write_prot = 0; + sdkp->cache_override = 0; + sdkp->WCE = 0; + sdkp->RCD = 0; + sdkp->ATO = 0; + sdkp->first_scan = 1; + sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; + + sd_revalidate_disk(gd); + + gd->driverfs_dev = &sdp->sdev_gendev; + gd->flags = GENHD_FL_EXT_DEVT; + if (sdp->removable) { + gd->flags |= GENHD_FL_REMOVABLE; + gd->events |= DISK_EVENT_MEDIA_CHANGE; + } + + blk_pm_runtime_init(sdp->request_queue, dev); + add_disk(gd); + if (sdkp->capacity) + sd_dif_config_host(sdkp); + + sd_revalidate_disk(gd); + + sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", + sdp->removable ? "removable " : ""); + scsi_autopm_put_device(sdp); + put_device(&sdkp->dev); +} + +/** + * sd_probe - called during driver initialization and whenever a + * new scsi device is attached to the system. It is called once + * for each scsi device (not just disks) present. + * @dev: pointer to device object + * + * Returns 0 if successful (or not interested in this scsi device + * (e.g. scanner)); 1 when there is an error. + * + * Note: this function is invoked from the scsi mid-level. + * This function sets up the mapping between a given + * <host,channel,id,lun> (found in sdp) and new device name + * (e.g. /dev/sda). More precisely it is the block device major + * and minor number that is chosen here. + * + * Assume sd_probe is not re-entrant (for time being) + * Also think about sd_probe() and sd_remove() running coincidentally. + **/ +static int sd_probe(struct device *dev) +{ + struct scsi_device *sdp = to_scsi_device(dev); + struct scsi_disk *sdkp; + struct gendisk *gd; + int index; + int error; + + scsi_autopm_get_device(sdp); + error = -ENODEV; + if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) + goto out; + + SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, + "sd_probe\n")); + + error = -ENOMEM; + sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); + if (!sdkp) + goto out; + + gd = alloc_disk(SD_MINORS); + if (!gd) + goto out_free; + + do { + if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) + goto out_put; + + spin_lock(&sd_index_lock); + error = ida_get_new(&sd_index_ida, &index); + spin_unlock(&sd_index_lock); + } while (error == -EAGAIN); + + if (error) { + sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); + goto out_put; + } + + error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); + if (error) { + sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); + goto out_free_index; + } + + sdkp->device = sdp; + sdkp->driver = &sd_template; + sdkp->disk = gd; + sdkp->index = index; + atomic_set(&sdkp->openers, 0); + atomic_set(&sdkp->device->ioerr_cnt, 0); + + if (!sdp->request_queue->rq_timeout) { + if (sdp->type != TYPE_MOD) + blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); + else + blk_queue_rq_timeout(sdp->request_queue, + SD_MOD_TIMEOUT); + } + + device_initialize(&sdkp->dev); + sdkp->dev.parent = dev; + sdkp->dev.class = &sd_disk_class; + dev_set_name(&sdkp->dev, "%s", dev_name(dev)); + + if (device_add(&sdkp->dev)) + goto out_free_index; + + get_device(dev); + dev_set_drvdata(dev, sdkp); + + get_device(&sdkp->dev); /* prevent release before async_schedule */ + async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); + + return 0; + + out_free_index: + spin_lock(&sd_index_lock); + ida_remove(&sd_index_ida, index); + spin_unlock(&sd_index_lock); + out_put: + put_disk(gd); + out_free: + kfree(sdkp); + out: + scsi_autopm_put_device(sdp); + return error; +} + +/** + * sd_remove - called whenever a scsi disk (previously recognized by + * sd_probe) is detached from the system. It is called (potentially + * multiple times) during sd module unload. + * @sdp: pointer to mid level scsi device object + * + * Note: this function is invoked from the scsi mid-level. + * This function potentially frees up a device name (e.g. /dev/sdc) + * that could be re-used by a subsequent sd_probe(). + * This function is not called when the built-in sd driver is "exit-ed". + **/ +static int sd_remove(struct device *dev) +{ + struct scsi_disk *sdkp; + dev_t devt; + + sdkp = dev_get_drvdata(dev); + devt = disk_devt(sdkp->disk); + scsi_autopm_get_device(sdkp->device); + + async_synchronize_full_domain(&scsi_sd_pm_domain); + async_synchronize_full_domain(&scsi_sd_probe_domain); + device_del(&sdkp->dev); + del_gendisk(sdkp->disk); + sd_shutdown(dev); + + blk_register_region(devt, SD_MINORS, NULL, + sd_default_probe, NULL, NULL); + + mutex_lock(&sd_ref_mutex); + dev_set_drvdata(dev, NULL); + put_device(&sdkp->dev); + mutex_unlock(&sd_ref_mutex); + + return 0; +} + +/** + * scsi_disk_release - Called to free the scsi_disk structure + * @dev: pointer to embedded class device + * + * sd_ref_mutex must be held entering this routine. Because it is + * called on last put, you should always use the scsi_disk_get() + * scsi_disk_put() helpers which manipulate the semaphore directly + * and never do a direct put_device. + **/ +static void scsi_disk_release(struct device *dev) +{ + struct scsi_disk *sdkp = to_scsi_disk(dev); + struct gendisk *disk = sdkp->disk; + + spin_lock(&sd_index_lock); + ida_remove(&sd_index_ida, sdkp->index); + spin_unlock(&sd_index_lock); + + blk_integrity_unregister(disk); + disk->private_data = NULL; + put_disk(disk); + put_device(&sdkp->device->sdev_gendev); + + kfree(sdkp); +} + +static int sd_start_stop_device(struct scsi_disk *sdkp, int start) +{ + unsigned char cmd[6] = { START_STOP }; /* START_VALID */ + struct scsi_sense_hdr sshdr; + struct scsi_device *sdp = sdkp->device; + int res; + + if (start) + cmd[4] |= 1; /* START */ + + if (sdp->start_stop_pwr_cond) + cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ + + if (!scsi_device_online(sdp)) + return -ENODEV; + + res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, + SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); + if (res) { + sd_print_result(sdkp, "Start/Stop Unit failed", res); + if (driver_byte(res) & DRIVER_SENSE) + sd_print_sense_hdr(sdkp, &sshdr); + if (scsi_sense_valid(&sshdr) && + /* 0x3a is medium not present */ + sshdr.asc == 0x3a) + res = 0; + } + + /* SCSI error codes must not go to the generic layer */ + if (res) + return -EIO; + + return 0; +} + +/* + * Send a SYNCHRONIZE CACHE instruction down to the device through + * the normal SCSI command structure. Wait for the command to + * complete. + */ +static void sd_shutdown(struct device *dev) +{ + struct scsi_disk *sdkp = dev_get_drvdata(dev); + + if (!sdkp) + return; /* this can happen */ + + if (pm_runtime_suspended(dev)) + return; + + if (sdkp->WCE && sdkp->media_present) { + sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); + sd_sync_cache(sdkp); + } + + if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { + sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); + sd_start_stop_device(sdkp, 0); + } +} + +static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) +{ + struct scsi_disk *sdkp = dev_get_drvdata(dev); + int ret = 0; + + if (!sdkp) + return 0; /* this can happen */ + + if (sdkp->WCE && sdkp->media_present) { + sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); + ret = sd_sync_cache(sdkp); + if (ret) { + /* ignore OFFLINE device */ + if (ret == -ENODEV) + ret = 0; + goto done; + } + } + + if (sdkp->device->manage_start_stop) { + sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); + /* an error is not worth aborting a system sleep */ + ret = sd_start_stop_device(sdkp, 0); + if (ignore_stop_errors) + ret = 0; + } + +done: + return ret; +} + +static int sd_suspend_system(struct device *dev) +{ + return sd_suspend_common(dev, true); +} + +static int sd_suspend_runtime(struct device *dev) +{ + return sd_suspend_common(dev, false); +} + +static int sd_resume(struct device *dev) +{ + struct scsi_disk *sdkp = dev_get_drvdata(dev); + + if (!sdkp->device->manage_start_stop) + return 0; + + sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); + return sd_start_stop_device(sdkp, 1); +} + +/** + * init_sd - entry point for this driver (both when built in or when + * a module). + * + * Note: this function registers this driver with the scsi mid-level. + **/ +static int __init init_sd(void) +{ + int majors = 0, i, err; + + SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); + + for (i = 0; i < SD_MAJORS; i++) { + if (register_blkdev(sd_major(i), "sd") != 0) + continue; + majors++; + blk_register_region(sd_major(i), SD_MINORS, NULL, + sd_default_probe, NULL, NULL); + } + + if (!majors) + return -ENODEV; + + err = class_register(&sd_disk_class); + if (err) + goto err_out; + + sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, + 0, 0, NULL); + if (!sd_cdb_cache) { + printk(KERN_ERR "sd: can't init extended cdb cache\n"); + err = -ENOMEM; + goto err_out_class; + } + + sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); + if (!sd_cdb_pool) { + printk(KERN_ERR "sd: can't init extended cdb pool\n"); + err = -ENOMEM; + goto err_out_cache; + } + + err = scsi_register_driver(&sd_template.gendrv); + if (err) + goto err_out_driver; + + return 0; + +err_out_driver: + mempool_destroy(sd_cdb_pool); + +err_out_cache: + kmem_cache_destroy(sd_cdb_cache); + +err_out_class: + class_unregister(&sd_disk_class); +err_out: + for (i = 0; i < SD_MAJORS; i++) + unregister_blkdev(sd_major(i), "sd"); + return err; +} + +/** + * exit_sd - exit point for this driver (when it is a module). + * + * Note: this function unregisters this driver from the scsi mid-level. + **/ +static void __exit exit_sd(void) +{ + int i; + + SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); + + scsi_unregister_driver(&sd_template.gendrv); + mempool_destroy(sd_cdb_pool); + kmem_cache_destroy(sd_cdb_cache); + + class_unregister(&sd_disk_class); + + for (i = 0; i < SD_MAJORS; i++) { + blk_unregister_region(sd_major(i), SD_MINORS); + unregister_blkdev(sd_major(i), "sd"); + } +} + +module_init(init_sd); +module_exit(exit_sd); + +static void sd_print_sense_hdr(struct scsi_disk *sdkp, + struct scsi_sense_hdr *sshdr) +{ + scsi_print_sense_hdr(sdkp->device, + sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); +} + +static void sd_print_result(const struct scsi_disk *sdkp, const char *msg, + int result) +{ + const char *hb_string = scsi_hostbyte_string(result); + const char *db_string = scsi_driverbyte_string(result); + + if (hb_string || db_string) + sd_printk(KERN_INFO, sdkp, + "%s: Result: hostbyte=%s driverbyte=%s\n", msg, + hb_string ? hb_string : "invalid", + db_string ? db_string : "invalid"); + else + sd_printk(KERN_INFO, sdkp, + "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", + msg, host_byte(result), driver_byte(result)); +} + |