| /* |
| * 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 <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_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 int sd_revalidate_disk(struct gendisk *); |
| static int sd_probe(struct device *); |
| static int sd_remove(struct device *); |
| static void sd_shutdown(struct device *); |
| static int sd_suspend(struct device *, pm_message_t state); |
| static int sd_resume(struct device *); |
| static void sd_rescan(struct device *); |
| static int sd_done(struct scsi_cmnd *); |
| 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(struct scsi_disk *, 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); |
| |
| struct kmem_cache *sd_cdb_cache; |
| mempool_t *sd_cdb_pool; |
| |
| static const char *sd_cache_types[] = { |
| "write through", "none", "write back", |
| "write back, no read (daft)" |
| }; |
| |
| static ssize_t |
| sd_store_cache_type(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; |
| 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; |
| |
| for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
| const int 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 ? 1 : 0; |
| 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 |
| sd_store_manage_start_stop(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 ssize_t |
| sd_store_allow_restart(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 ssize_t |
| sd_show_cache_type(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 ssize_t |
| sd_show_fua(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 ssize_t |
| sd_show_manage_start_stop(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 |
| sd_show_allow_restart(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 |
| sd_show_protection_type(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 |
| sd_show_app_tag_own(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 ssize_t |
| sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct scsi_disk *sdkp = to_scsi_disk(dev); |
| |
| return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); |
| } |
| |
| static struct device_attribute sd_disk_attrs[] = { |
| __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
| sd_store_cache_type), |
| __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), |
| __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
| sd_store_allow_restart), |
| __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
| sd_store_manage_start_stop), |
| __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), |
| __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), |
| __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), |
| __ATTR_NULL, |
| }; |
| |
| static struct class sd_disk_class = { |
| .name = "scsi_disk", |
| .owner = THIS_MODULE, |
| .dev_release = scsi_disk_release, |
| .dev_attrs = sd_disk_attrs, |
| }; |
| |
| static struct scsi_driver sd_template = { |
| .owner = THIS_MODULE, |
| .gendrv = { |
| .name = "sd", |
| .probe = sd_probe, |
| .remove = sd_remove, |
| .suspend = sd_suspend, |
| .resume = sd_resume, |
| .shutdown = sd_shutdown, |
| }, |
| .rescan = sd_rescan, |
| .done = sd_done, |
| }; |
| |
| /* |
| * 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; |
| |
| if (disk->private_data) { |
| sdkp = scsi_disk(disk); |
| if (scsi_device_get(sdkp->device) == 0) |
| get_device(&sdkp->dev); |
| else |
| sdkp = NULL; |
| } |
| return sdkp; |
| } |
| |
| static struct scsi_disk *scsi_disk_get(struct gendisk *disk) |
| { |
| struct scsi_disk *sdkp; |
| |
| mutex_lock(&sd_ref_mutex); |
| sdkp = __scsi_disk_get(disk); |
| mutex_unlock(&sd_ref_mutex); |
| return sdkp; |
| } |
| |
| static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
| { |
| struct scsi_disk *sdkp; |
| |
| mutex_lock(&sd_ref_mutex); |
| sdkp = dev_get_drvdata(dev); |
| if (sdkp) |
| sdkp = __scsi_disk_get(sdkp->disk); |
| 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 void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) |
| { |
| unsigned int prot_op = SCSI_PROT_NORMAL; |
| unsigned int dix = scsi_prot_sg_count(scmd); |
| |
| if (scmd->sc_data_direction == DMA_FROM_DEVICE) { |
| if (dif && dix) |
| prot_op = SCSI_PROT_READ_PASS; |
| else if (dif && !dix) |
| prot_op = SCSI_PROT_READ_STRIP; |
| else if (!dif && dix) |
| prot_op = SCSI_PROT_READ_INSERT; |
| } else { |
| if (dif && dix) |
| prot_op = SCSI_PROT_WRITE_PASS; |
| else if (dif && !dix) |
| prot_op = SCSI_PROT_WRITE_INSERT; |
| else if (!dif && dix) |
| prot_op = SCSI_PROT_WRITE_STRIP; |
| } |
| |
| scsi_set_prot_op(scmd, prot_op); |
| scsi_set_prot_type(scmd, dif); |
| } |
| |
| /** |
| * sd_prepare_discard - unmap blocks on thinly provisioned device |
| * @rq: Request to prepare |
| * |
| * Will issue either UNMAP or WRITE SAME(16) depending on preference |
| * indicated by target device. |
| **/ |
| static int sd_prepare_discard(struct request *rq) |
| { |
| struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); |
| struct bio *bio = rq->bio; |
| sector_t sector = bio->bi_sector; |
| unsigned int num = bio_sectors(bio); |
| |
| if (sdkp->device->sector_size == 4096) { |
| sector >>= 3; |
| num >>= 3; |
| } |
| |
| rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| rq->timeout = SD_TIMEOUT; |
| |
| memset(rq->cmd, 0, rq->cmd_len); |
| |
| if (sdkp->unmap) { |
| char *buf = kmap_atomic(bio_page(bio), KM_USER0); |
| |
| rq->cmd[0] = UNMAP; |
| rq->cmd[8] = 24; |
| rq->cmd_len = 10; |
| |
| /* Ensure that data length matches payload */ |
| rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24; |
| |
| put_unaligned_be16(6 + 16, &buf[0]); |
| put_unaligned_be16(16, &buf[2]); |
| put_unaligned_be64(sector, &buf[8]); |
| put_unaligned_be32(num, &buf[16]); |
| |
| kunmap_atomic(buf, KM_USER0); |
| } else { |
| rq->cmd[0] = WRITE_SAME_16; |
| rq->cmd[1] = 0x8; /* UNMAP */ |
| put_unaligned_be64(sector, &rq->cmd[2]); |
| put_unaligned_be32(num, &rq->cmd[10]); |
| rq->cmd_len = 16; |
| } |
| |
| return BLKPREP_OK; |
| } |
| |
| /** |
| * sd_init_command - build a scsi (read or write) command from |
| * information in the request structure. |
| * @SCpnt: pointer to mid-level's per scsi command structure that |
| * contains request and into which the scsi command is written |
| * |
| * Returns 1 if successful and 0 if error (or cannot be done now). |
| **/ |
| static int sd_prep_fn(struct request_queue *q, struct request *rq) |
| { |
| struct scsi_cmnd *SCpnt; |
| struct scsi_device *sdp = q->queuedata; |
| 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); |
| int ret, host_dif; |
| unsigned char protect; |
| |
| /* |
| * Discard request come in as REQ_TYPE_FS but we turn them into |
| * block PC requests to make life easier. |
| */ |
| if (blk_discard_rq(rq)) |
| ret = sd_prepare_discard(rq); |
| |
| if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
| ret = scsi_setup_blk_pc_cmnd(sdp, rq); |
| goto out; |
| } else if (rq->cmd_type != REQ_TYPE_FS) { |
| ret = BLKPREP_KILL; |
| goto out; |
| } |
| ret = scsi_setup_fs_cmnd(sdp, rq); |
| 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, |
| "sd_init_command: block=%llu, " |
| "count=%d\n", |
| (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. 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) { |
| if (!sdp->writeable) { |
| goto out; |
| } |
| SCpnt->cmnd[0] = WRITE_6; |
| SCpnt->sc_data_direction = DMA_TO_DEVICE; |
| |
| if (blk_integrity_rq(rq) && |
| sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) |
| goto out; |
| |
| } else if (rq_data_dir(rq) == READ) { |
| SCpnt->cmnd[0] = READ_6; |
| SCpnt->sc_data_direction = DMA_FROM_DEVICE; |
| } else { |
| scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", 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))); |
| |
| /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
| host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
| if (host_dif) |
| protect = 1 << 5; |
| else |
| protect = 0; |
| |
| if (host_dif == 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 | (blk_fua_rq(rq) ? 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 (block > 0xffffffff) { |
| SCpnt->cmnd[0] += READ_16 - READ_6; |
| SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 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) { |
| if (this_count > 0xffff) |
| this_count = 0xffff; |
| |
| SCpnt->cmnd[0] += READ_10 - READ_6; |
| SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 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(blk_fua_rq(rq))) { |
| /* |
| * 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; |
| |
| /* If DIF or DIX is enabled, tell HBA how to handle request */ |
| if (host_dif || scsi_prot_sg_count(SCpnt)) |
| sd_prot_op(SCpnt, host_dif); |
| |
| /* |
| * 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 scsi_prep_return(q, rq, ret); |
| } |
| |
| /** |
| * 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. |
| **/ |
| 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 (!sdkp->openers++ && 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. |
| **/ |
| static int 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 (!--sdkp->openers && 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); |
| return 0; |
| } |
| |
| 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 postive 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_device *sdp = scsi_disk(disk)->device; |
| void __user *p = (void __user *)arg; |
| int error; |
| |
| SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", |
| disk->disk_name, cmd)); |
| |
| /* |
| * 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_nonblockable_ioctl(sdp, cmd, p, |
| (mode & FMODE_NDELAY) != 0); |
| if (!scsi_block_when_processing_errors(sdp) || !error) |
| return error; |
| |
| /* |
| * 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: |
| return scsi_ioctl(sdp, cmd, p); |
| default: |
| error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); |
| if (error != -ENOTTY) |
| return error; |
| } |
| return scsi_ioctl(sdp, cmd, p); |
| } |
| |
| static void set_media_not_present(struct scsi_disk *sdkp) |
| { |
| sdkp->media_present = 0; |
| sdkp->capacity = 0; |
| sdkp->device->changed = 1; |
| } |
| |
| /** |
| * sd_media_changed - check if our medium changed |
| * @disk: kernel device descriptor |
| * |
| * Returns 0 if not applicable or no change; 1 if change |
| * |
| * Note: this function is invoked from the block subsystem. |
| **/ |
| static int sd_media_changed(struct gendisk *disk) |
| { |
| 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_media_changed\n")); |
| |
| if (!sdp->removable) |
| return 0; |
| |
| /* |
| * 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); |
| retval = 1; |
| 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); |
| } |
| |
| /* |
| * Unable to test, unit probably not ready. This usually |
| * means there is no disc in the drive. Mark as changed, |
| * and we will figure it out later once the drive is |
| * available again. |
| */ |
| if (retval || (scsi_sense_valid(sshdr) && |
| /* 0x3a is medium not present */ |
| sshdr->asc == 0x3a)) { |
| set_media_not_present(sdkp); |
| retval = 1; |
| goto out; |
| } |
| |
| /* |
| * For removable scsi disk we have to recognise the presence |
| * of a disk in the drive. This is kept in the struct scsi_disk |
| * struct and tested at open ! Daniel Roche (dan@lectra.fr) |
| */ |
| sdkp->media_present = 1; |
| |
| retval = sdp->changed; |
| sdp->changed = 0; |
| out: |
| if (retval != sdkp->previous_state) |
| sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); |
| sdkp->previous_state = retval; |
| kfree(sshdr); |
| return retval; |
| } |
| |
| static int sd_sync_cache(struct scsi_disk *sdkp) |
| { |
| int retries, res; |
| struct scsi_device *sdp = sdkp->device; |
| 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(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
| SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
| if (res == 0) |
| break; |
| } |
| |
| if (res) { |
| sd_print_result(sdkp, res); |
| if (driver_byte(res) & DRIVER_SENSE) |
| sd_print_sense_hdr(sdkp, &sshdr); |
| } |
| |
| if (res) |
| return -EIO; |
| return 0; |
| } |
| |
| static void sd_prepare_flush(struct request_queue *q, struct request *rq) |
| { |
| rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| rq->timeout = SD_TIMEOUT; |
| rq->cmd[0] = SYNCHRONIZE_CACHE; |
| rq->cmd_len = 10; |
| } |
| |
| static void sd_rescan(struct device *dev) |
| { |
| struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
| |
| if (sdkp) { |
| revalidate_disk(sdkp->disk); |
| scsi_disk_put(sdkp); |
| } |
| } |
| |
| |
| #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; |
| |
| /* |
| * 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. |
| */ |
| if (!scsi_block_when_processing_errors(sdev)) |
| return -ENODEV; |
| |
| if (sdev->host->hostt->compat_ioctl) { |
| int ret; |
| |
| ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); |
| |
| return ret; |
| } |
| |
| /* |
| * Let the static ioctl translation table take care of it. |
| */ |
| return -ENOIOCTLCMD; |
| } |
| #endif |
| |
| static const struct block_device_operations sd_fops = { |
| .owner = THIS_MODULE, |
| .open = sd_open, |
| .release = sd_release, |
| .locked_ioctl = sd_ioctl, |
| .getgeo = sd_getgeo, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = sd_compat_ioctl, |
| #endif |
| .media_changed = sd_media_changed, |
| .revalidate_disk = sd_revalidate_disk, |
| }; |
| |
| 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 bad_lba; |
| int info_valid; |
| |
| if (!blk_fs_request(scmd->request)) |
| 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; |
| |
| if (scmd->device->sector_size < 512) { |
| /* only legitimate sector_size here is 256 */ |
| start_lba <<= 1; |
| end_lba <<= 1; |
| } else { |
| /* be careful ... don't want any overflows */ |
| u64 factor = scmd->device->sector_size / 512; |
| 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. |
| */ |
| return (bad_lba - start_lba) * scmd->device->sector_size; |
| } |
| |
| /** |
| * 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); |
| int sense_valid = 0; |
| int sense_deferred = 0; |
| |
| if (result) { |
| sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); |
| if (sense_valid) |
| sense_deferred = scsi_sense_is_deferred(&sshdr); |
| } |
| #ifdef CONFIG_SCSI_LOGGING |
| SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
| if (sense_valid) { |
| SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
| "sd_done: sb[respc,sk,asc," |
| "ascq]=%x,%x,%x,%x\n", |
| sshdr.response_code, |
| sshdr.sense_key, sshdr.asc, |
| sshdr.ascq)); |
| } |
| #endif |
| 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. |
| */ |
| scsi_print_sense("sd", SCpnt); |
| SCpnt->result = 0; |
| memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
| break; |
| case ABORTED_COMMAND: /* DIF: Target detected corruption */ |
| case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ |
| if (sshdr.asc == 0x10) |
| good_bytes = sd_completed_bytes(SCpnt); |
| break; |
| default: |
| break; |
| } |
| out: |
| if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
| sd_dif_complete(SCpnt, good_bytes); |
| |
| if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) |
| == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { |
| |
| /* We have to print a failed command here as the |
| * extended CDB gets freed before scsi_io_completion() |
| * is called. |
| */ |
| if (result) |
| scsi_print_command(SCpnt); |
| |
| mempool_free(SCpnt->cmnd, sd_cdb_pool); |
| SCpnt->cmnd = NULL; |
| SCpnt->cmd_len = 0; |
| } |
| |
| return good_bytes; |
| } |
| |
| 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 */ |
| if (sshdr->sense_key != NOT_READY && |
| sshdr->sense_key != UNIT_ATTENTION) |
| return 0; |
| if (sshdr->asc != 0x3A) /* medium not present */ |
| return 0; |
| |
| set_media_not_present(sdkp); |
| return 1; |
| } |
| |
| /* |
| * 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_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
| sd_print_result(sdkp, 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. |
| */ |
| void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) |
| { |
| struct scsi_device *sdp = sdkp->device; |
| u8 type; |
| |
| if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) |
| return; |
| |
| type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ |
| |
| if (type == sdkp->protection_type || !sdkp->first_scan) |
| return; |
| |
| sdkp->protection_type = type; |
| |
| if (type > SD_DIF_TYPE3_PROTECTION) { |
| sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ |
| "protection type %u. Disabling disk!\n", type); |
| sdkp->capacity = 0; |
| return; |
| } |
| |
| if (scsi_host_dif_capable(sdp->host, type)) |
| sd_printk(KERN_NOTICE, sdkp, |
| "Enabling DIF Type %u protection\n", type); |
| else |
| sd_printk(KERN_NOTICE, sdkp, |
| "Disabling DIF Type %u protection\n", type); |
| } |
| |
| static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, |
| struct scsi_sense_hdr *sshdr, int sense_valid, |
| int the_result) |
| { |
| sd_print_result(sdkp, 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) |
| sdp->changed = 1; |
| |
| /* |
| * 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 |
| |
| 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; |
| unsigned int alignment; |
| unsigned long long lba; |
| unsigned sector_size; |
| |
| do { |
| memset(cmd, 0, 16); |
| cmd[0] = SERVICE_ACTION_IN; |
| 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; |
| } |
| retries--; |
| |
| } while (the_result && retries); |
| |
| if (the_result) { |
| sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
| 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]); |
| |
| sd_read_protection_type(sdkp, buffer); |
| |
| 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->hw_sector_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) { /* TPE */ |
| struct request_queue *q = sdp->request_queue; |
| |
| sdkp->thin_provisioning = 1; |
| q->limits.discard_granularity = sdkp->hw_sector_size; |
| q->limits.max_discard_sectors = 0xffffffff; |
| |
| if (buffer[14] & 0x40) /* TPRZ */ |
| q->limits.discard_zeroes_data = 1; |
| |
| queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
| } |
| |
| 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; |
| 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); |
| retries--; |
| |
| } while (the_result && retries); |
| |
| if (the_result) { |
| sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); |
| 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 ((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->hw_sector_size = sector_size; |
| return sector_size; |
| } |
| |
| static int sd_try_rc16_first(struct scsi_device *sdp) |
| { |
| 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 && |
| sector_size != 256) { |
| 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]; |
| u64 sz = (u64)sdkp->capacity << ilog2(sector_size); |
| |
| string_get_size(sz, STRING_UNITS_2, cap_str_2, |
| sizeof(cap_str_2)); |
| string_get_size(sz, 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->hw_sector_size != sector_size) |
| sd_printk(KERN_NOTICE, sdkp, |
| "%u-byte physical blocks\n", |
| sdkp->hw_sector_size); |
| } |
| } |
| |
| /* 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; |
| else if (sector_size == 256) |
| sdkp->capacity >>= 1; |
| |
| blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_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_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_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; |
| 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 (sdp->skip_ms_page_8) |
| goto defaults; |
| |
| 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, 4, &data, &sshdr); |
| |
| if (!scsi_status_is_good(res)) |
| goto bad_sense; |
| |
| if (!data.header_length) { |
| modepage = 6; |
| sd_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; |
| if (len > 20) |
| len = 20; |
| |
| /* Take headers and block descriptors into account */ |
| len += data.header_length + data.block_descriptor_length; |
| if (len > SD_BUF_SIZE) |
| goto bad_sense; |
| |
| /* Get the data */ |
| 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; |
| |
| if (offset >= SD_BUF_SIZE - 2) { |
| sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
| goto defaults; |
| } |
| |
| if ((buffer[offset] & 0x3f) != modepage) { |
| sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
| goto defaults; |
| } |
| |
| 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 (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { |
| sd_printk(KERN_NOTICE, sdkp, |
| "Uses READ/WRITE(6), disabling FUA\n"); |
| sdkp->DPOFUA = 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_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); |
| else |
| sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
| |
| defaults: |
| sd_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. |
| */ |
| 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_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_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) |
| { |
| struct request_queue *q = sdkp->disk->queue; |
| unsigned int sector_sz = sdkp->device->sector_size; |
| const int vpd_len = 64; |
| 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; |
| |
| 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); |
| |
| /* Thin provisioning enabled and page length indicates TP support */ |
| if (sdkp->thin_provisioning && buffer[3] == 0x3c) { |
| unsigned int lba_count, desc_count, granularity; |
| |
| lba_count = get_unaligned_be32(&buffer[20]); |
| desc_count = get_unaligned_be32(&buffer[24]); |
| |
| if (lba_count) { |
| q->limits.max_discard_sectors = |
| lba_count * sector_sz >> 9; |
| |
| if (desc_count) |
| sdkp->unmap = 1; |
| } |
| |
| granularity = get_unaligned_be32(&buffer[28]); |
| |
| if (granularity) |
| q->limits.discard_granularity = granularity * sector_sz; |
| |
| if (buffer[32] & 0x80) |
| q->limits.discard_alignment = |
| get_unaligned_be32(&buffer[32]) & ~(1 << 31); |
| } |
| |
| 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); |
| |
| out: |
| kfree(buffer); |
| } |
| |
| static int sd_try_extended_inquiry(struct scsi_device *sdp) |
| { |
| /* |
| * 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) |
| 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 ordered; |
| |
| 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_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); |
| } |
| |
| sdkp->first_scan = 0; |
| |
| /* |
| * We now have all cache related info, determine how we deal |
| * with ordered requests. Note that as the current SCSI |
| * dispatch function can alter request order, we cannot use |
| * QUEUE_ORDERED_TAG_* even when ordered tag is supported. |
| */ |
| if (sdkp->WCE) |
| ordered = sdkp->DPOFUA |
| ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; |
| else |
| ordered = QUEUE_ORDERED_DRAIN; |
| |
| blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); |
| |
| set_capacity(disk, sdkp->capacity); |
| kfree(buffer); |
| |
| out: |
| return 0; |
| } |
| |
| /** |
| * 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; |
| |
| if (index < SD_MAX_DISKS) { |
| 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->WCE = 0; |
| sdkp->RCD = 0; |
| sdkp->ATO = 0; |
| sdkp->first_scan = 1; |
| |
| sd_revalidate_disk(gd); |
| |
| blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); |
| |
| gd->driverfs_dev = &sdp->sdev_gendev; |
| gd->flags = GENHD_FL_EXT_DEVT; |
| if (sdp->removable) |
| gd->flags |= GENHD_FL_REMOVABLE; |
| |
| dev_set_drvdata(dev, sdkp); |
| add_disk(gd); |
| sd_dif_config_host(sdkp); |
| |
| sd_revalidate_disk(gd); |
| |
| sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
| sdp->removable ? "removable " : ""); |
| 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_attach is not re-entrant (for time being) |
| * Also think about sd_attach() 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; |
| u32 index; |
| int error; |
| |
| 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_attach\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) |
| goto out_put; |
| |
| error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); |
| if (error) |
| goto out_free_index; |
| |
| sdkp->device = sdp; |
| sdkp->driver = &sd_template; |
| sdkp->disk = gd; |
| sdkp->index = index; |
| sdkp->openers = 0; |
| sdkp->previous_state = 1; |
| |
| 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 = &sdp->sdev_gendev; |
| sdkp->dev.class = &sd_disk_class; |
| dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); |
| |
| if (device_add(&sdkp->dev)) |
| goto out_free_index; |
| |
| get_device(&sdp->sdev_gendev); |
| |
| get_device(&sdkp->dev); /* prevent release before async_schedule */ |
| async_schedule(sd_probe_async, sdkp); |
| |
| 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: |
| 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; |
| |
| async_synchronize_full(); |
| sdkp = dev_get_drvdata(dev); |
| blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); |
| device_del(&sdkp->dev); |
| del_gendisk(sdkp->disk); |
| sd_shutdown(dev); |
| |
| 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); |
| |
| 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(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
| SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
| if (res) { |
| sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
| sd_print_result(sdkp, res); |
| if (driver_byte(res) & DRIVER_SENSE) |
| sd_print_sense_hdr(sdkp, &sshdr); |
| } |
| |
| return res; |
| } |
| |
| /* |
| * 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 = scsi_disk_get_from_dev(dev); |
| |
| if (!sdkp) |
| return; /* this can happen */ |
| |
| if (sdkp->WCE) { |
| 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); |
| } |
| |
| scsi_disk_put(sdkp); |
| } |
| |
| static int sd_suspend(struct device *dev, pm_message_t mesg) |
| { |
| struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
| int ret = 0; |
| |
| if (!sdkp) |
| return 0; /* this can happen */ |
| |
| if (sdkp->WCE) { |
| sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
| ret = sd_sync_cache(sdkp); |
| if (ret) |
| goto done; |
| } |
| |
| if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { |
| sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
| ret = sd_start_stop_device(sdkp, 0); |
| } |
| |
| done: |
| scsi_disk_put(sdkp); |
| return ret; |
| } |
| |
| static int sd_resume(struct device *dev) |
| { |
| struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
| int ret = 0; |
| |
| if (!sdkp->device->manage_start_stop) |
| goto done; |
| |
| sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
| ret = sd_start_stop_device(sdkp, 1); |
| |
| done: |
| scsi_disk_put(sdkp); |
| return ret; |
| } |
| |
| /** |
| * 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) |
| majors++; |
| |
| if (!majors) |
| return -ENODEV; |
| |
| err = class_register(&sd_disk_class); |
| if (err) |
| goto err_out; |
| |
| err = scsi_register_driver(&sd_template.gendrv); |
| if (err) |
| goto err_out_class; |
| |
| 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"); |
| 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"); |
| goto err_out_cache; |
| } |
| |
| return 0; |
| |
| 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")); |
| |
| mempool_destroy(sd_cdb_pool); |
| kmem_cache_destroy(sd_cdb_cache); |
| |
| scsi_unregister_driver(&sd_template.gendrv); |
| class_unregister(&sd_disk_class); |
| |
| for (i = 0; i < SD_MAJORS; i++) |
| 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) |
| { |
| sd_printk(KERN_INFO, sdkp, ""); |
| scsi_show_sense_hdr(sshdr); |
| sd_printk(KERN_INFO, sdkp, ""); |
| scsi_show_extd_sense(sshdr->asc, sshdr->ascq); |
| } |
| |
| static void sd_print_result(struct scsi_disk *sdkp, int result) |
| { |
| sd_printk(KERN_INFO, sdkp, ""); |
| scsi_show_result(result); |
| } |
| |