| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Martin K. Petersen | 4805 | 29.08% | 49 | 12.69% |
| Christoph Hellwig | 2983 | 18.05% | 48 | 12.44% |
| James Bottomley | 1660 | 10.05% | 39 | 10.10% |
| Tejun Heo | 817 | 4.94% | 16 | 4.15% |
| Matthew Wilcox | 706 | 4.27% | 5 | 1.30% |
| Linus Torvalds (pre-git) | 639 | 3.87% | 42 | 10.88% |
| Hannes Reinecke | 637 | 3.85% | 12 | 3.11% |
| Andries E. Brouwer | 314 | 1.90% | 5 | 1.30% |
| Alex Tomas | 291 | 1.76% | 2 | 0.52% |
| Luben Tuikov | 260 | 1.57% | 4 | 1.04% |
| Jens Axboe | 258 | 1.56% | 8 | 2.07% |
| Alan Stern | 250 | 1.51% | 16 | 4.15% |
| Al Viro | 233 | 1.41% | 16 | 4.15% |
| Damien Le Moal | 227 | 1.37% | 7 | 1.81% |
| Arjan van de Ven | 225 | 1.36% | 2 | 0.52% |
| Linus Torvalds | 215 | 1.30% | 11 | 2.85% |
| Greg Kroah-Hartman | 204 | 1.23% | 2 | 0.52% |
| Oliver Neukum | 181 | 1.10% | 2 | 0.52% |
| René Herman | 95 | 0.57% | 1 | 0.26% |
| Mike Anderson | 91 | 0.55% | 2 | 0.52% |
| Brian King | 88 | 0.53% | 2 | 0.52% |
| Bart Van Assche | 80 | 0.48% | 6 | 1.55% |
| Andi Kleen | 73 | 0.44% | 1 | 0.26% |
| Douglas Gilbert | 73 | 0.44% | 3 | 0.78% |
| Tony Jones | 70 | 0.42% | 1 | 0.26% |
| Hans de Goede | 59 | 0.36% | 2 | 0.52% |
| Patrick Mansfield | 57 | 0.34% | 4 | 1.04% |
| Jeff Garzik | 55 | 0.33% | 1 | 0.26% |
| Derek Basehore | 50 | 0.30% | 1 | 0.26% |
| Aaron Lu | 49 | 0.30% | 2 | 0.52% |
| Vaughan Cao | 44 | 0.27% | 1 | 0.26% |
| Andrew Morton | 40 | 0.24% | 5 | 1.30% |
| Stefan Richter | 39 | 0.24% | 1 | 0.26% |
| weiping zhang | 36 | 0.22% | 2 | 0.52% |
| Michael Christie | 35 | 0.21% | 2 | 0.52% |
| FUJITA Tomonori | 34 | 0.21% | 3 | 0.78% |
| Arnd Bergmann | 34 | 0.21% | 2 | 0.52% |
| Paolo Bonzini | 33 | 0.20% | 2 | 0.52% |
| Joel D. Diaz | 32 | 0.19% | 1 | 0.26% |
| Dan J Williams | 26 | 0.16% | 4 | 1.04% |
| Namjae Jeon | 25 | 0.15% | 1 | 0.26% |
| Sujit Reddy Thumma | 24 | 0.15% | 1 | 0.26% |
| Jamie Wellnitz | 22 | 0.13% | 1 | 0.26% |
| Max Gurtovoy | 21 | 0.13% | 1 | 0.26% |
| Kay Sievers | 20 | 0.12% | 2 | 0.52% |
| Dave Hansen | 19 | 0.11% | 1 | 0.26% |
| Jan Kara | 18 | 0.11% | 1 | 0.26% |
| Nao Nishijima | 16 | 0.10% | 1 | 0.26% |
| Mahesh Rajashekhara | 16 | 0.10% | 1 | 0.26% |
| Michael Tokarev | 15 | 0.09% | 1 | 0.26% |
| Nagendra Singh Tomar | 14 | 0.08% | 1 | 0.26% |
| Fam Zheng | 13 | 0.08% | 1 | 0.26% |
| Dave Kleikamp | 13 | 0.08% | 1 | 0.26% |
| Jeremy Cline | 12 | 0.07% | 1 | 0.26% |
| Johannes Thumshirn | 12 | 0.07% | 2 | 0.52% |
| Joshua Hunt | 12 | 0.07% | 1 | 0.26% |
| Michael Reed | 12 | 0.07% | 1 | 0.26% |
| Clément Calmels | 10 | 0.06% | 1 | 0.26% |
| Lin Ming | 10 | 0.06% | 1 | 0.26% |
| Subhash Jadavani | 10 | 0.06% | 1 | 0.26% |
| Eddie Williams | 10 | 0.06% | 1 | 0.26% |
| Mike Snitzer | 9 | 0.05% | 1 | 0.26% |
| Gabriel Krisman Bertazi | 8 | 0.05% | 1 | 0.26% |
| Bernd Schubert | 7 | 0.04% | 1 | 0.26% |
| Ivan Mironov | 7 | 0.04% | 1 | 0.26% |
| K. Y. Srinivasan | 7 | 0.04% | 1 | 0.26% |
| H Hartley Sweeten | 6 | 0.04% | 1 | 0.26% |
| David Jeffery | 6 | 0.04% | 1 | 0.26% |
| Akinobu Mita | 6 | 0.04% | 1 | 0.26% |
| Dan Carpenter | 6 | 0.04% | 1 | 0.26% |
| Maximilian Attems | 5 | 0.03% | 1 | 0.26% |
| Mark Hounschell | 4 | 0.02% | 1 | 0.26% |
| Michał Mirosław | 3 | 0.02% | 1 | 0.26% |
| Jason J. Herne | 3 | 0.02% | 1 | 0.26% |
| Boaz Harrosh | 3 | 0.02% | 1 | 0.26% |
| Petr Uzel | 2 | 0.01% | 1 | 0.26% |
| Russell King | 2 | 0.01% | 1 | 0.26% |
| Colin Ian King | 2 | 0.01% | 1 | 0.26% |
| Kees Cook | 2 | 0.01% | 1 | 0.26% |
| Badari Pulavarty | 2 | 0.01% | 1 | 0.26% |
| Ben Hutchings | 2 | 0.01% | 1 | 0.26% |
| Andrew Patterson | 2 | 0.01% | 1 | 0.26% |
| Doug Ledford | 2 | 0.01% | 1 | 0.26% |
| Kent Overstreet | 1 | 0.01% | 1 | 0.26% |
| Alexey Dobriyan | 1 | 0.01% | 1 | 0.26% |
| John Pittman | 1 | 0.01% | 1 | 0.26% |
| Daniel Mack | 1 | 0.01% | 1 | 0.26% |
| Kirill A. Shutemov | 1 | 0.01% | 1 | 0.26% |
| Andy Shevchenko | 1 | 0.01% | 1 | 0.26% |
| Total | 16524 | 386 |
/* * 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/blk-pm.h> #include <linux/delay.h> #include <linux/mutex.h> #include <linux/string_helpers.h> #include <linux/async.h> #include <linux/slab.h> #include <linux/sed-opal.h> #include <linux/pm_runtime.h> #include <linux/pr.h> #include <linux/t10-pi.h> #include <linux/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); MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC); #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 blk_status_t sd_init_command(struct scsi_cmnd *SCpnt); static void sd_uninit_command(struct scsi_cmnd *SCpnt); static int sd_done(struct scsi_cmnd *); static void sd_eh_reset(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_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 mempool_t *sd_page_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) { bool wc = false, fua = false; if (sdkp->WCE) { wc = true; if (sdkp->DPOFUA) fua = true; } blk_queue_write_cache(sdkp->disk->queue, wc, fua); } static ssize_t cache_type_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ct, 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 && sdp->type != TYPE_ZBC) /* 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; } ct = sysfs_match_string(sd_cache_types, buf); 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; buffer_data[0] &= ~0x80; /* * Ensure WP, DPOFUA, and RESERVED fields are cleared in * received mode parameter buffer before doing MODE SELECT. */ data.device_specific = 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 sprintf(buf, "%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; bool v; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (kstrtobool(buf, &v)) return -EINVAL; sdp->manage_start_stop = v; 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 sprintf(buf, "%u\n", sdkp->device->allow_restart); } static ssize_t allow_restart_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { bool v; 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 && sdp->type != TYPE_ZBC) return -EINVAL; if (kstrtobool(buf, &v)) return -EINVAL; sdp->allow_restart = v; 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 sprintf(buf, "%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 sprintf(buf, "%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 sprintf(buf, "%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 <= T10_PI_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, T10_PI_TYPE0_PROTECTION)) { dif = 0; dix = 1; } if (!dif && !dix) return sprintf(buf, "none\n"); return sprintf(buf, "%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 sprintf(buf, "%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 sprintf(buf, "%u\n", sdkp->lbpme); } static DEVICE_ATTR_RO(thin_provisioning); /* sysfs_match_string() requires dense arrays */ 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 sprintf(buf, "%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; int mode; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (sd_is_zoned(sdkp)) { sd_config_discard(sdkp, SD_LBP_DISABLE); return count; } if (sdp->type != TYPE_DISK) return -EINVAL; mode = sysfs_match_string(lbp_mode, buf); if (mode < 0) return -EINVAL; sd_config_discard(sdkp, mode); return count; } static DEVICE_ATTR_RW(provisioning_mode); /* sysfs_match_string() requires dense arrays */ static const char *zeroing_mode[] = { [SD_ZERO_WRITE] = "write", [SD_ZERO_WS] = "writesame", [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap", [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap", }; static ssize_t zeroing_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct scsi_disk *sdkp = to_scsi_disk(dev); return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]); } static ssize_t zeroing_mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct scsi_disk *sdkp = to_scsi_disk(dev); int mode; if (!capable(CAP_SYS_ADMIN)) return -EACCES; mode = sysfs_match_string(zeroing_mode, buf); if (mode < 0) return -EINVAL; sdkp->zeroing_mode = mode; return count; } static DEVICE_ATTR_RW(zeroing_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 sprintf(buf, "%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 sprintf(buf, "%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 && sdp->type != TYPE_ZBC) 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_zeroing_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, .eh_reset = sd_eh_reset, }; /* * 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); } #ifdef CONFIG_BLK_SED_OPAL static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, bool send) { struct scsi_device *sdev = data; u8 cdb[12] = { 0, }; int ret; cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN; cdb[1] = secp; put_unaligned_be16(spsp, &cdb[2]); put_unaligned_be32(len, &cdb[6]); ret = scsi_execute_req(sdev, cdb, send ? DMA_TO_DEVICE : DMA_FROM_DEVICE, buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL); return ret <= 0 ? ret : -EIO; } #endif /* CONFIG_BLK_SED_OPAL */ 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 != T10_PI_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_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_FULL: case SD_LBP_DISABLE: blk_queue_max_discard_sectors(q, 0); blk_queue_flag_clear(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: if (sdkp->device->unmap_limit_for_ws) max_blocks = sdkp->max_unmap_blocks; else max_blocks = sdkp->max_ws_blocks; max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS); break; case SD_LBP_WS10: if (sdkp->device->unmap_limit_for_ws) max_blocks = sdkp->max_unmap_blocks; else max_blocks = sdkp->max_ws_blocks; max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS); break; case SD_LBP_ZERO: max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)SD_MAX_WS10_BLOCKS); break; } blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9)); blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); } static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) { struct scsi_device *sdp = cmd->device; struct request *rq = cmd->request; u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); unsigned int data_len = 24; char *buf; rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC); if (!rq->special_vec.bv_page) return BLK_STS_RESOURCE; clear_highpage(rq->special_vec.bv_page); rq->special_vec.bv_offset = 0; rq->special_vec.bv_len = data_len; rq->rq_flags |= RQF_SPECIAL_PAYLOAD; cmd->cmd_len = 10; cmd->cmnd[0] = UNMAP; cmd->cmnd[8] = 24; buf = page_address(rq->special_vec.bv_page); 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]); cmd->allowed = SD_MAX_RETRIES; cmd->transfersize = data_len; rq->timeout = SD_TIMEOUT; scsi_req(rq)->resid_len = data_len; return scsi_init_io(cmd); } static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap) { struct scsi_device *sdp = cmd->device; struct request *rq = cmd->request; u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); u32 data_len = sdp->sector_size; rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC); if (!rq->special_vec.bv_page) return BLK_STS_RESOURCE; clear_highpage(rq->special_vec.bv_page); rq->special_vec.bv_offset = 0; rq->special_vec.bv_len = data_len; rq->rq_flags |= RQF_SPECIAL_PAYLOAD; cmd->cmd_len = 16; cmd->cmnd[0] = WRITE_SAME_16; if (unmap) cmd->cmnd[1] = 0x8; /* UNMAP */ put_unaligned_be64(sector, &cmd->cmnd[2]); put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); cmd->allowed = SD_MAX_RETRIES; cmd->transfersize = data_len; rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; scsi_req(rq)->resid_len = data_len; return scsi_init_io(cmd); } static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap) { struct scsi_device *sdp = cmd->device; struct request *rq = cmd->request; u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); u32 data_len = sdp->sector_size; rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC); if (!rq->special_vec.bv_page) return BLK_STS_RESOURCE; clear_highpage(rq->special_vec.bv_page); rq->special_vec.bv_offset = 0; rq->special_vec.bv_len = data_len; rq->rq_flags |= RQF_SPECIAL_PAYLOAD; cmd->cmd_len = 10; cmd->cmnd[0] = WRITE_SAME; if (unmap) cmd->cmnd[1] = 0x8; /* UNMAP */ put_unaligned_be32(sector, &cmd->cmnd[2]); put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); cmd->allowed = SD_MAX_RETRIES; cmd->transfersize = data_len; rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; scsi_req(rq)->resid_len = data_len; return scsi_init_io(cmd); } static blk_status_t sd_setup_write_zeroes_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); u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); if (!(rq->cmd_flags & REQ_NOUNMAP)) { switch (sdkp->zeroing_mode) { case SD_ZERO_WS16_UNMAP: return sd_setup_write_same16_cmnd(cmd, true); case SD_ZERO_WS10_UNMAP: return sd_setup_write_same10_cmnd(cmd, true); } } if (sdp->no_write_same) return BLK_STS_TARGET; if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) return sd_setup_write_same16_cmnd(cmd, false); return sd_setup_write_same10_cmnd(cmd, false); } 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; } if (sdkp->lbprz && sdkp->lbpws) sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP; else if (sdkp->lbprz && sdkp->lbpws10) sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP; else if (sdkp->max_ws_blocks) sdkp->zeroing_mode = SD_ZERO_WS; else sdkp->zeroing_mode = SD_ZERO_WRITE; if (sdkp->max_ws_blocks && sdkp->physical_block_size > logical_block_size) { /* * Reporting a maximum number of blocks that is not aligned * on the device physical size would cause a large write same * request to be split into physically unaligned chunks by * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same() * even if the caller of these functions took care to align the * large request. So make sure the maximum reported is aligned * to the device physical block size. This is only an optional * optimization for regular disks, but this is mandatory to * avoid failure of large write same requests directed at * sequential write required zones of host-managed ZBC disks. */ sdkp->max_ws_blocks = round_down(sdkp->max_ws_blocks, bytes_to_logical(sdkp->device, sdkp->physical_block_size)); } out: blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * (logical_block_size >> 9)); blk_queue_max_write_zeroes_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 set up either WRITE SAME(10) or WRITE SAME(16) depending on * the preference indicated by the target device. **/ static blk_status_t 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); blk_status_t ret; if (sdkp->device->no_write_same) return BLK_STS_TARGET; 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 via the DATA OUT buffer is * different from the amount of data actually written to the target. * * We set up __data_len to the amount of data transferred via the * DATA OUT buffer so that blk_rq_map_sg sets 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 blk_status_t 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 BLK_STS_OK; } static blk_status_t 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 = scsi_disk(disk); sector_t block = blk_rq_pos(rq); sector_t threshold; unsigned int this_count = blk_rq_sectors(rq); unsigned int dif, dix; unsigned char protect; blk_status_t ret; ret = scsi_init_io(SCpnt); if (ret != BLK_STS_OK) return ret; WARN_ON_ONCE(SCpnt != rq->special); 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)); return BLK_STS_IOERR; } 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"); */ return BLK_STS_IOERR; } /* * 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"); return BLK_STS_IOERR; } 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"); return BLK_STS_IOERR; } 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"); return BLK_STS_IOERR; } block = block >> 3; this_count = this_count >> 3; } if (rq_data_dir(rq) == WRITE) { SCpnt->cmnd[0] = WRITE_6; if (blk_integrity_rq(rq)) t10_pi_prepare(SCpnt->request, sdkp->protection_type); } else if (rq_data_dir(rq) == READ) { SCpnt->cmnd[0] = READ_6; } else { scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq)); return BLK_STS_IOERR; } 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 == T10_PI_TYPE2_PROTECTION) { SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); if (unlikely(!SCpnt->cmnd)) return BLK_STS_RESOURCE; 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"); return BLK_STS_IOERR; } 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. */ return BLK_STS_OK; } static blk_status_t sd_init_command(struct scsi_cmnd *cmd) { struct request *rq = cmd->request; switch (req_op(rq)) { case REQ_OP_DISCARD: switch (scsi_disk(rq->rq_disk)->provisioning_mode) { case SD_LBP_UNMAP: return sd_setup_unmap_cmnd(cmd); case SD_LBP_WS16: return sd_setup_write_same16_cmnd(cmd, true); case SD_LBP_WS10: return sd_setup_write_same10_cmnd(cmd, true); case SD_LBP_ZERO: return sd_setup_write_same10_cmnd(cmd, false); default: return BLK_STS_TARGET; } case REQ_OP_WRITE_ZEROES: return sd_setup_write_zeroes_cmnd(cmd); case REQ_OP_WRITE_SAME: return sd_setup_write_same_cmnd(cmd); case REQ_OP_FLUSH: return sd_setup_flush_cmnd(cmd); case REQ_OP_READ: case REQ_OP_WRITE: return sd_setup_read_write_cmnd(cmd); case REQ_OP_ZONE_RESET: return sd_zbc_setup_reset_cmnd(cmd); default: WARN_ON_ONCE(1); return BLK_STS_NOTSUPP; } } static void sd_uninit_command(struct scsi_cmnd *SCpnt) { struct request *rq = SCpnt->request; u8 *cmnd; if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) mempool_free(rq->special_vec.bv_page, sd_page_pool); if (SCpnt->cmnd != scsi_req(rq)->cmd) { cmnd = SCpnt->cmnd; SCpnt->cmnd = NULL; SCpnt->cmd_len = 0; mempool_free(cmnd, sd_cdb_pool); } } /** * sd_open - open a scsi disk device * @bdev: Block device of the scsi disk to open * @mode: FMODE_* mask * * 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. * @disk: disk to release * @mode: FMODE_* mask * * 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; sector_t capacity = logical_to_sectors(sdp, sdkp->capacity); int diskinfo[4]; /* default to most commonly used values */ diskinfo[0] = 0x40; /* 1 << 6 */ diskinfo[1] = 0x20; /* 1 << 5 */ diskinfo[2] = capacity >> 11; /* override with calculated, extended default, or driver values */ if (host->hostt->bios_param) host->hostt->bios_param(sdp, bdev, capacity, diskinfo); else scsicam_bios_param(bdev, capacity, diskinfo); geo->heads = diskinfo[0]; geo->sectors = diskinfo[1]; geo->cylinders = diskinfo[2]; return 0; } /** * sd_ioctl - process an ioctl * @bdev: target block device * @mode: FMODE_* mask * @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; if (is_sed_ioctl(cmd)) return sed_ioctl(sdkp->opal_dev, cmd, p); /* * 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_get(disk); struct scsi_device *sdp; int retval; if (!sdkp) return 0; sdp = sdkp->device; 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. */ if (scsi_block_when_processing_errors(sdp)) { struct scsi_sense_hdr sshdr = { 0, }; 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. */ retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; sdp->changed = 0; scsi_disk_put(sdkp); return retval; } static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) { 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 my_sshdr; if (!scsi_device_online(sdp)) return -ENODEV; /* caller might not be interested in sense, but we need it */ if (!sshdr) sshdr = &my_sshdr; 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(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr, timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL); 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 char sd_pr_type(enum pr_type type) { switch (type) { case PR_WRITE_EXCLUSIVE: return 0x01; case PR_EXCLUSIVE_ACCESS: return 0x03; case PR_WRITE_EXCLUSIVE_REG_ONLY: return 0x05; case PR_EXCLUSIVE_ACCESS_REG_ONLY: return 0x06; case PR_WRITE_EXCLUSIVE_ALL_REGS: return 0x07; case PR_EXCLUSIVE_ACCESS_ALL_REGS: return 0x08; default: return 0; } }; static int sd_pr_command(struct block_device *bdev, u8 sa, u64 key, u64 sa_key, u8 type, u8 flags) { struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; struct scsi_sense_hdr sshdr; int result; u8 cmd[16] = { 0, }; u8 data[24] = { 0, }; cmd[0] = PERSISTENT_RESERVE_OUT; cmd[1] = sa; cmd[2] = type; put_unaligned_be32(sizeof(data), &cmd[5]); put_unaligned_be64(key, &data[0]); put_unaligned_be64(sa_key, &data[8]); data[20] = flags; result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data), &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL); if (driver_byte(result) == DRIVER_SENSE && scsi_sense_valid(&sshdr)) { sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); scsi_print_sense_hdr(sdev, NULL, &sshdr); } return result; } static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, u32 flags) { if (flags & ~PR_FL_IGNORE_KEY) return -EOPNOTSUPP; return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00, old_key, new_key, 0, (1 << 0) /* APTPL */); } static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, u32 flags) { if (flags) return -EOPNOTSUPP; return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0); } static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) { return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0); } static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, enum pr_type type, bool abort) { return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, sd_pr_type(type), 0); } static int sd_pr_clear(struct block_device *bdev, u64 key) { return sd_pr_command(bdev, 0x03, key, 0, 0, 0); } static const struct pr_ops sd_pr_ops = { .pr_register = sd_pr_register, .pr_reserve = sd_pr_reserve, .pr_release = sd_pr_release, .pr_preempt = sd_pr_preempt, .pr_clear = sd_pr_clear, }; 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, .report_zones = sd_zbc_report_zones, .pr_ops = &sd_pr_ops, }; /** * sd_eh_reset - reset error handling callback * @scmd: sd-issued command that has failed * * This function is called by the SCSI midlayer before starting * SCSI EH. When counting medium access failures we have to be * careful to register it only only once per device and SCSI EH run; * there might be several timed out commands which will cause the * 'max_medium_access_timeouts' counter to trigger after the first * SCSI EH run already and set the device to offline. * So this function resets the internal counter before starting SCSI EH. **/ static void sd_eh_reset(struct scsi_cmnd *scmd) { struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); /* New SCSI EH run, reset gate variable */ sdkp->ignore_medium_access_errors = false; } /** * 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); struct scsi_device *sdev = scmd->device; if (!scsi_device_online(sdev) || !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. */ if (!sdkp->ignore_medium_access_errors) { sdkp->medium_access_timed_out++; sdkp->ignore_medium_access_errors = true; } /* * 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"); mutex_lock(&sdev->state_mutex); scsi_device_set_state(sdev, SDEV_OFFLINE); mutex_unlock(&sdev->state_mutex); return SUCCESS; } return eh_disp; } static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) { struct request *req = scmd->request; struct scsi_device *sdev = scmd->device; unsigned int transferred, good_bytes; u64 start_lba, end_lba, bad_lba; /* * Some commands have a payload smaller than the device logical * block size (e.g. INQUIRY on a 4K disk). */ if (scsi_bufflen(scmd) <= sdev->sector_size) return 0; /* Check if we have a 'bad_lba' information */ if (!scsi_get_sense_info_fld(scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, &bad_lba)) return 0; /* * If the bad lba was reported incorrectly, we have no idea where * the error is. */ start_lba = sectors_to_logical(sdev, blk_rq_pos(req)); end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd)); if (bad_lba < start_lba || bad_lba >= end_lba) return 0; /* * resid is optional but mostly filled in. When it's unused, * its value is zero, so we assume the whole buffer transferred */ transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); /* This computation should always be done in terms of the * resolution of the device's medium. */ good_bytes = logical_to_bytes(sdev, bad_lba - start_lba); 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); unsigned int sector_size = SCpnt->device->sector_size; unsigned int resid; 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; switch (req_op(req)) { case REQ_OP_DISCARD: case REQ_OP_WRITE_ZEROES: case REQ_OP_WRITE_SAME: case REQ_OP_ZONE_RESET: 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)); } break; default: /* * In case of bogus fw or device, we could end up having * an unaligned partial completion. Check this here and force * alignment. */ resid = scsi_get_resid(SCpnt); if (resid & (sector_size - 1)) { sd_printk(KERN_INFO, sdkp, "Unaligned partial completion (resid=%u, sector_sz=%u)\n", resid, sector_size); resid = min(scsi_bufflen(SCpnt), round_up(resid, sector_size)); scsi_set_resid(SCpnt, resid); } } 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: switch (sshdr.asc) { case 0x10: /* DIX: Host detected corruption */ good_bytes = sd_completed_bytes(SCpnt); break; case 0x20: /* INVALID COMMAND OPCODE */ case 0x24: /* INVALID FIELD IN CDB */ switch (SCpnt->cmnd[0]) { case UNMAP: sd_config_discard(sdkp, SD_LBP_DISABLE); break; case WRITE_SAME_16: case WRITE_SAME: if (SCpnt->cmnd[1] & 8) { /* UNMAP */ sd_config_discard(sdkp, SD_LBP_DISABLE); } else { sdkp->device->no_write_same = 1; sd_config_write_same(sdkp); req->rq_flags |= RQF_QUIET; } break; } } break; default: break; } out: if (sd_is_zoned(sdkp)) sd_zbc_complete(SCpnt, good_bytes, &sshdr); 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) && good_bytes) t10_pi_complete(SCpnt->request, sdkp->protection_type, good_bytes / scsi_prot_interval(SCpnt)); 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) { /* 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 */ if (sshdr.asc == 4 && sshdr.ascq == 0x1b) break; /* sanitize in progress */ /* * 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(KERN_CONT "."); /* * 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(KERN_CONT "ready\n"); else printk(KERN_CONT "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 > T10_PI_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 /* * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set * and the reported logical block size is bigger than 512 bytes. Note * that last_sector is a u64 and therefore logical_to_sectors() is not * applicable. */ static bool sd_addressable_capacity(u64 lba, unsigned int sector_size) { u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9); if (sizeof(sector_t) == 4 && last_sector > U32_MAX) return false; return true; } 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 (!sd_addressable_capacity(lba, sector_size)) { 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; /* RC basis */ sdkp->rc_basis = (buffer[12] >> 4) & 0x3; /* 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 (!sd_addressable_capacity(lba, sector_size)) { 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; 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; } /* Remember that READ CAPACITY(16) succeeded */ sdp->try_rc_10_first = 0; } } /* 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); blk_queue_physical_block_size(sdp->request_queue, sdkp->physical_block_size); sdkp->device->sector_size = sector_size; if (sdkp->capacity > 0xffffffff) sdp->use_16_for_rw = 1; } /* * Print disk capacity */ static void sd_print_capacity(struct scsi_disk *sdkp, sector_t old_capacity) { int sector_size = sdkp->device->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); sd_zbc_print_zones(sdkp); } } /* 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 disk_ro = get_disk_ro(sdkp->disk); 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 || disk_ro); 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: %4ph\n", buffer); } } } /* * 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 && !sdkp->device->use_16_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 && sdp->type != TYPE_ZBC) 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. * @sdkp: 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; 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); sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]); sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]); 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) 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 sd_config_discard(sdkp, SD_LBP_DISABLE); } } out: kfree(buffer); } /** * sd_read_block_characteristics - Query block dev. characteristics * @sdkp: disk to query */ static void sd_read_block_characteristics(struct scsi_disk *sdkp) { struct request_queue *q = sdkp->disk->queue; 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) { blk_queue_flag_set(QUEUE_FLAG_NONROT, q); blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); } if (sdkp->device->type == TYPE_ZBC) { /* Host-managed */ q->limits.zoned = BLK_ZONED_HM; } else { sdkp->zoned = (buffer[8] >> 4) & 3; if (sdkp->zoned == 1) /* Host-aware */ q->limits.zoned = BLK_ZONED_HA; else /* * Treat drive-managed devices as * regular block devices. */ q->limits.zoned = BLK_ZONED_NONE; } if (blk_queue_is_zoned(q) && sdkp->first_scan) sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n", q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware"); out: kfree(buffer); } /** * sd_read_block_provisioning - Query provisioning VPD page * @sdkp: 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 void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer) { struct scsi_device *sdev = sdkp->device; if (!sdev->security_supported) return; if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, SECURITY_PROTOCOL_IN) == 1 && scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, SECURITY_PROTOCOL_OUT) == 1) sdkp->security = 1; } /** * 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; struct request_queue *q = sdkp->disk->queue; sector_t old_capacity = sdkp->capacity; unsigned char *buffer; unsigned int dev_max, rw_max; 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); /* * set the default to rotational. All non-rotational devices * support the block characteristics VPD page, which will * cause this to be updated correctly and any device which * doesn't support it should be treated as rotational. */ blk_queue_flag_clear(QUEUE_FLAG_NONROT, q); blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q); if (scsi_device_supports_vpd(sdp)) { sd_read_block_provisioning(sdkp); sd_read_block_limits(sdkp); sd_read_block_characteristics(sdkp); sd_zbc_read_zones(sdkp, buffer); } sd_print_capacity(sdkp, old_capacity); 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); sd_read_security(sdkp, buffer); } /* * We now have all cache related info, determine how we deal * with flush requests. */ sd_set_flush_flag(sdkp); /* Initial block count limit based on CDB TRANSFER LENGTH field size. */ dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS; /* Some devices report a maximum block count for READ/WRITE requests. */ dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks); q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max); /* * Determine the device's preferred I/O size for reads and writes * unless the reported value is unreasonably small, large, or * garbage. */ if (sdkp->opt_xfer_blocks && sdkp->opt_xfer_blocks <= dev_max && sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS && logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) { q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks); rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks); } else rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), (sector_t)BLK_DEF_MAX_SECTORS); /* Do not exceed controller limit */ rw_max = min(rw_max, queue_max_hw_sectors(q)); /* * Only update max_sectors if previously unset or if the current value * exceeds the capabilities of the hardware. */ if (sdkp->first_scan || q->limits.max_sectors > q->limits.max_dev_sectors || q->limits.max_sectors > q->limits.max_hw_sectors) q->limits.max_sectors = rw_max; sdkp->first_scan = 0; set_capacity(disk, logical_to_sectors(sdp, 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->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->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); device_add_disk(dev, gd, NULL); if (sdkp->capacity) sd_dif_config_host(sdkp); sd_revalidate_disk(gd); if (sdkp->security) { sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit); if (sdkp->opal_dev) sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n"); } 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_ZBC && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) goto out; #ifndef CONFIG_BLK_DEV_ZONED if (sdp->type == TYPE_ZBC) goto out; #endif 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; index = ida_alloc(&sd_index_ida, GFP_KERNEL); if (index < 0) { 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)); error = device_add(&sdkp->dev); if (error) 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: ida_free(&sd_index_ida, index); 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. * @dev: pointer to 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); free_opal_dev(sdkp->opal_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; ida_free(&sd_index_ida, sdkp->index); 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(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL); 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, NULL); } 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); struct scsi_sense_hdr sshdr; int ret = 0; if (!sdkp) /* E.g.: runtime suspend following sd_remove() */ return 0; if (sdkp->WCE && sdkp->media_present) { sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); ret = sd_sync_cache(sdkp, &sshdr); if (ret) { /* ignore OFFLINE device */ if (ret == -ENODEV) return 0; if (!scsi_sense_valid(&sshdr) || sshdr.sense_key != ILLEGAL_REQUEST) return ret; /* * sshdr.sense_key == ILLEGAL_REQUEST means this drive * doesn't support sync. There's not much to do and * suspend shouldn't fail. */ ret = 0; } } 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; } 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); int ret; if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ return 0; if (!sdkp->device->manage_start_stop) return 0; sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); ret = sd_start_stop_device(sdkp, 1); if (!ret) opal_unlock_from_suspend(sdkp->opal_dev); 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) 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; } sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0); if (!sd_page_pool) { printk(KERN_ERR "sd: can't init discard page pool\n"); err = -ENOMEM; goto err_out_ppool; } err = scsi_register_driver(&sd_template.gendrv); if (err) goto err_out_driver; return 0; err_out_driver: mempool_destroy(sd_page_pool); err_out_ppool: 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); mempool_destroy(sd_page_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)); }
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