90467c294a
scsi-ml builds flush requests via q->prepare_flush_fn(), however, builds discard requests via q->prep_rq_fn. Using two different mechnisms for the similar requests (building commands in SCSI ULD) doesn't make sense. Handing both via q->prep_rq_fn makes the code design simpler. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2610 lines
69 KiB
C
2610 lines
69 KiB
C
/*
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* sd.c Copyright (C) 1992 Drew Eckhardt
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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*
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* Linux scsi disk driver
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* Initial versions: Drew Eckhardt
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* Subsequent revisions: Eric Youngdale
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* Modification history:
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* - Drew Eckhardt <drew@colorado.edu> original
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* - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
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* outstanding request, and other enhancements.
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* Support loadable low-level scsi drivers.
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* - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
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* eight major numbers.
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* - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
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* - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
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* sd_init and cleanups.
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* - Alex Davis <letmein@erols.com> Fix problem where partition info
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* not being read in sd_open. Fix problem where removable media
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* could be ejected after sd_open.
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* - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
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* - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
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* <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
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* Support 32k/1M disks.
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*
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* Logging policy (needs CONFIG_SCSI_LOGGING defined):
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* - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
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* - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
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* - entering sd_ioctl: SCSI_LOG_IOCTL level 1
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* - entering other commands: SCSI_LOG_HLQUEUE level 3
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* Note: when the logging level is set by the user, it must be greater
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* than the level indicated above to trigger output.
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bio.h>
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#include <linux/genhd.h>
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#include <linux/hdreg.h>
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#include <linux/errno.h>
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#include <linux/idr.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/string_helpers.h>
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#include <linux/async.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsicam.h>
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#include "sd.h"
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#include "scsi_logging.h"
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MODULE_AUTHOR("Eric Youngdale");
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MODULE_DESCRIPTION("SCSI disk (sd) driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
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#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
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#define SD_MINORS 16
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#else
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#define SD_MINORS 0
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#endif
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static int sd_revalidate_disk(struct gendisk *);
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static void sd_unlock_native_capacity(struct gendisk *disk);
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static int sd_probe(struct device *);
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static int sd_remove(struct device *);
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static void sd_shutdown(struct device *);
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static int sd_suspend(struct device *, pm_message_t state);
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static int sd_resume(struct device *);
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static void sd_rescan(struct device *);
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static int sd_done(struct scsi_cmnd *);
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static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
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static void scsi_disk_release(struct device *cdev);
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static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
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static void sd_print_result(struct scsi_disk *, int);
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static DEFINE_SPINLOCK(sd_index_lock);
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static DEFINE_IDA(sd_index_ida);
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/* This semaphore is used to mediate the 0->1 reference get in the
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* face of object destruction (i.e. we can't allow a get on an
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* object after last put) */
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static DEFINE_MUTEX(sd_ref_mutex);
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struct kmem_cache *sd_cdb_cache;
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mempool_t *sd_cdb_pool;
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static const char *sd_cache_types[] = {
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"write through", "none", "write back",
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"write back, no read (daft)"
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};
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static ssize_t
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sd_store_cache_type(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int i, ct = -1, rcd, wce, sp;
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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char buffer[64];
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char *buffer_data;
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struct scsi_mode_data data;
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struct scsi_sense_hdr sshdr;
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int len;
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if (sdp->type != TYPE_DISK)
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/* no cache control on RBC devices; theoretically they
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* can do it, but there's probably so many exceptions
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* it's not worth the risk */
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
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const int len = strlen(sd_cache_types[i]);
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if (strncmp(sd_cache_types[i], buf, len) == 0 &&
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buf[len] == '\n') {
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ct = i;
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break;
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}
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}
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if (ct < 0)
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return -EINVAL;
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rcd = ct & 0x01 ? 1 : 0;
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wce = ct & 0x02 ? 1 : 0;
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if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
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SD_MAX_RETRIES, &data, NULL))
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return -EINVAL;
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len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
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data.block_descriptor_length);
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buffer_data = buffer + data.header_length +
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data.block_descriptor_length;
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buffer_data[2] &= ~0x05;
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buffer_data[2] |= wce << 2 | rcd;
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sp = buffer_data[0] & 0x80 ? 1 : 0;
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if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
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SD_MAX_RETRIES, &data, &sshdr)) {
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if (scsi_sense_valid(&sshdr))
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sd_print_sense_hdr(sdkp, &sshdr);
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return -EINVAL;
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}
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revalidate_disk(sdkp->disk);
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return count;
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}
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static ssize_t
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sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t
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sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (sdp->type != TYPE_DISK)
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return -EINVAL;
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sdp->allow_restart = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t
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sd_show_cache_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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int ct = sdkp->RCD + 2*sdkp->WCE;
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return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
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}
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static ssize_t
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sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
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}
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static ssize_t
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sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
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}
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static ssize_t
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sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
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}
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static ssize_t
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sd_show_protection_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->protection_type);
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}
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static ssize_t
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sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->ATO);
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}
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static ssize_t
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sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
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}
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static struct device_attribute sd_disk_attrs[] = {
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__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
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sd_store_cache_type),
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__ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
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__ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
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sd_store_allow_restart),
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__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
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sd_store_manage_start_stop),
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__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
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__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
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__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
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__ATTR_NULL,
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};
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static struct class sd_disk_class = {
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.name = "scsi_disk",
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.owner = THIS_MODULE,
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.dev_release = scsi_disk_release,
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.dev_attrs = sd_disk_attrs,
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};
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static struct scsi_driver sd_template = {
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.owner = THIS_MODULE,
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.gendrv = {
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.name = "sd",
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.probe = sd_probe,
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.remove = sd_remove,
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.suspend = sd_suspend,
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.resume = sd_resume,
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.shutdown = sd_shutdown,
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},
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.rescan = sd_rescan,
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.done = sd_done,
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};
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/*
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* Device no to disk mapping:
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*
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* major disc2 disc p1
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* |............|.............|....|....| <- dev_t
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* 31 20 19 8 7 4 3 0
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*
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* Inside a major, we have 16k disks, however mapped non-
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* contiguously. The first 16 disks are for major0, the next
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* ones with major1, ... Disk 256 is for major0 again, disk 272
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* for major1, ...
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* As we stay compatible with our numbering scheme, we can reuse
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* the well-know SCSI majors 8, 65--71, 136--143.
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*/
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static int sd_major(int major_idx)
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{
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switch (major_idx) {
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case 0:
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return SCSI_DISK0_MAJOR;
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case 1 ... 7:
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return SCSI_DISK1_MAJOR + major_idx - 1;
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case 8 ... 15:
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return SCSI_DISK8_MAJOR + major_idx - 8;
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default:
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BUG();
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return 0; /* shut up gcc */
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}
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}
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static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
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{
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struct scsi_disk *sdkp = NULL;
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if (disk->private_data) {
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sdkp = scsi_disk(disk);
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if (scsi_device_get(sdkp->device) == 0)
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get_device(&sdkp->dev);
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else
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sdkp = NULL;
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}
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return sdkp;
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}
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static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
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{
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struct scsi_disk *sdkp;
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mutex_lock(&sd_ref_mutex);
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sdkp = __scsi_disk_get(disk);
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mutex_unlock(&sd_ref_mutex);
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return sdkp;
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}
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static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
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{
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struct scsi_disk *sdkp;
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mutex_lock(&sd_ref_mutex);
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sdkp = dev_get_drvdata(dev);
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if (sdkp)
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sdkp = __scsi_disk_get(sdkp->disk);
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mutex_unlock(&sd_ref_mutex);
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return sdkp;
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}
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static void scsi_disk_put(struct scsi_disk *sdkp)
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{
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struct scsi_device *sdev = sdkp->device;
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mutex_lock(&sd_ref_mutex);
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put_device(&sdkp->dev);
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scsi_device_put(sdev);
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mutex_unlock(&sd_ref_mutex);
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}
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static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
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{
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unsigned int prot_op = SCSI_PROT_NORMAL;
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unsigned int dix = scsi_prot_sg_count(scmd);
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if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
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if (dif && dix)
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prot_op = SCSI_PROT_READ_PASS;
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else if (dif && !dix)
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prot_op = SCSI_PROT_READ_STRIP;
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else if (!dif && dix)
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prot_op = SCSI_PROT_READ_INSERT;
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} else {
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if (dif && dix)
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prot_op = SCSI_PROT_WRITE_PASS;
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else if (dif && !dix)
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prot_op = SCSI_PROT_WRITE_INSERT;
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else if (!dif && dix)
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prot_op = SCSI_PROT_WRITE_STRIP;
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}
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scsi_set_prot_op(scmd, prot_op);
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scsi_set_prot_type(scmd, dif);
|
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}
|
|
|
|
/**
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* scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
|
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* @sdp: scsi device to operate one
|
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* @rq: Request to prepare
|
|
*
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* Will issue either UNMAP or WRITE SAME(16) depending on preference
|
|
* indicated by target device.
|
|
**/
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static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
|
|
{
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
|
|
struct bio *bio = rq->bio;
|
|
sector_t sector = bio->bi_sector;
|
|
unsigned int nr_sectors = bio_sectors(bio);
|
|
unsigned int len;
|
|
int ret;
|
|
struct page *page;
|
|
|
|
if (sdkp->device->sector_size == 4096) {
|
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sector >>= 3;
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nr_sectors >>= 3;
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}
|
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rq->cmd_type = REQ_TYPE_BLOCK_PC;
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rq->timeout = SD_TIMEOUT;
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memset(rq->cmd, 0, rq->cmd_len);
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|
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page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
|
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if (!page)
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return BLKPREP_DEFER;
|
|
|
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if (sdkp->unmap) {
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|
char *buf = page_address(page);
|
|
|
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rq->cmd_len = 10;
|
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rq->cmd[0] = UNMAP;
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rq->cmd[8] = 24;
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|
|
|
put_unaligned_be16(6 + 16, &buf[0]);
|
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put_unaligned_be16(16, &buf[2]);
|
|
put_unaligned_be64(sector, &buf[8]);
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put_unaligned_be32(nr_sectors, &buf[16]);
|
|
|
|
len = 24;
|
|
} else {
|
|
rq->cmd_len = 16;
|
|
rq->cmd[0] = WRITE_SAME_16;
|
|
rq->cmd[1] = 0x8; /* UNMAP */
|
|
put_unaligned_be64(sector, &rq->cmd[2]);
|
|
put_unaligned_be32(nr_sectors, &rq->cmd[10]);
|
|
|
|
len = sdkp->device->sector_size;
|
|
}
|
|
|
|
blk_add_request_payload(rq, page, len);
|
|
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
|
|
rq->buffer = page_address(page);
|
|
return ret;
|
|
}
|
|
|
|
static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
|
|
{
|
|
/* for now, we use REQ_TYPE_BLOCK_PC. */
|
|
rq->cmd_type = REQ_TYPE_BLOCK_PC;
|
|
rq->timeout = SD_TIMEOUT;
|
|
rq->retries = SD_MAX_RETRIES;
|
|
rq->cmd[0] = SYNCHRONIZE_CACHE;
|
|
rq->cmd_len = 10;
|
|
|
|
return scsi_setup_blk_pc_cmnd(sdp, rq);
|
|
}
|
|
|
|
static void sd_unprep_fn(struct request_queue *q, struct request *rq)
|
|
{
|
|
if (rq->cmd_flags & REQ_DISCARD)
|
|
__free_page(virt_to_page(rq->buffer));
|
|
}
|
|
|
|
/**
|
|
* sd_init_command - build a scsi (read or write) command from
|
|
* information in the request structure.
|
|
* @SCpnt: pointer to mid-level's per scsi command structure that
|
|
* contains request and into which the scsi command is written
|
|
*
|
|
* Returns 1 if successful and 0 if error (or cannot be done now).
|
|
**/
|
|
static int sd_prep_fn(struct request_queue *q, struct request *rq)
|
|
{
|
|
struct scsi_cmnd *SCpnt;
|
|
struct scsi_device *sdp = q->queuedata;
|
|
struct gendisk *disk = rq->rq_disk;
|
|
struct scsi_disk *sdkp;
|
|
sector_t block = blk_rq_pos(rq);
|
|
sector_t threshold;
|
|
unsigned int this_count = blk_rq_sectors(rq);
|
|
int ret, host_dif;
|
|
unsigned char protect;
|
|
|
|
/*
|
|
* Discard request come in as REQ_TYPE_FS but we turn them into
|
|
* block PC requests to make life easier.
|
|
*/
|
|
if (rq->cmd_flags & REQ_DISCARD) {
|
|
ret = scsi_setup_discard_cmnd(sdp, rq);
|
|
goto out;
|
|
} else if (rq->cmd_flags & REQ_FLUSH) {
|
|
ret = scsi_setup_flush_cmnd(sdp, rq);
|
|
goto out;
|
|
} else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
|
|
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
|
|
goto out;
|
|
} else if (rq->cmd_type != REQ_TYPE_FS) {
|
|
ret = BLKPREP_KILL;
|
|
goto out;
|
|
}
|
|
ret = scsi_setup_fs_cmnd(sdp, rq);
|
|
if (ret != BLKPREP_OK)
|
|
goto out;
|
|
SCpnt = rq->special;
|
|
sdkp = scsi_disk(disk);
|
|
|
|
/* from here on until we're complete, any goto out
|
|
* is used for a killable error condition */
|
|
ret = BLKPREP_KILL;
|
|
|
|
SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
|
|
"sd_init_command: block=%llu, "
|
|
"count=%d\n",
|
|
(unsigned long long)block,
|
|
this_count));
|
|
|
|
if (!sdp || !scsi_device_online(sdp) ||
|
|
block + blk_rq_sectors(rq) > get_capacity(disk)) {
|
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
|
|
"Finishing %u sectors\n",
|
|
blk_rq_sectors(rq)));
|
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
|
|
"Retry with 0x%p\n", SCpnt));
|
|
goto out;
|
|
}
|
|
|
|
if (sdp->changed) {
|
|
/*
|
|
* quietly refuse to do anything to a changed disc until
|
|
* the changed bit has been reset
|
|
*/
|
|
/* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Some SD card readers can't handle multi-sector accesses which touch
|
|
* the last one or two hardware sectors. Split accesses as needed.
|
|
*/
|
|
threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
|
|
(sdp->sector_size / 512);
|
|
|
|
if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
|
|
if (block < threshold) {
|
|
/* Access up to the threshold but not beyond */
|
|
this_count = threshold - block;
|
|
} else {
|
|
/* Access only a single hardware sector */
|
|
this_count = sdp->sector_size / 512;
|
|
}
|
|
}
|
|
|
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
|
|
(unsigned long long)block));
|
|
|
|
/*
|
|
* If we have a 1K hardware sectorsize, prevent access to single
|
|
* 512 byte sectors. In theory we could handle this - in fact
|
|
* the scsi cdrom driver must be able to handle this because
|
|
* we typically use 1K blocksizes, and cdroms typically have
|
|
* 2K hardware sectorsizes. Of course, things are simpler
|
|
* with the cdrom, since it is read-only. For performance
|
|
* reasons, the filesystems should be able to handle this
|
|
* and not force the scsi disk driver to use bounce buffers
|
|
* for this.
|
|
*/
|
|
if (sdp->sector_size == 1024) {
|
|
if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
|
|
scmd_printk(KERN_ERR, SCpnt,
|
|
"Bad block number requested\n");
|
|
goto out;
|
|
} else {
|
|
block = block >> 1;
|
|
this_count = this_count >> 1;
|
|
}
|
|
}
|
|
if (sdp->sector_size == 2048) {
|
|
if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
|
|
scmd_printk(KERN_ERR, SCpnt,
|
|
"Bad block number requested\n");
|
|
goto out;
|
|
} else {
|
|
block = block >> 2;
|
|
this_count = this_count >> 2;
|
|
}
|
|
}
|
|
if (sdp->sector_size == 4096) {
|
|
if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
|
|
scmd_printk(KERN_ERR, SCpnt,
|
|
"Bad block number requested\n");
|
|
goto out;
|
|
} else {
|
|
block = block >> 3;
|
|
this_count = this_count >> 3;
|
|
}
|
|
}
|
|
if (rq_data_dir(rq) == WRITE) {
|
|
if (!sdp->writeable) {
|
|
goto out;
|
|
}
|
|
SCpnt->cmnd[0] = WRITE_6;
|
|
SCpnt->sc_data_direction = DMA_TO_DEVICE;
|
|
|
|
if (blk_integrity_rq(rq) &&
|
|
sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
|
|
goto out;
|
|
|
|
} else if (rq_data_dir(rq) == READ) {
|
|
SCpnt->cmnd[0] = READ_6;
|
|
SCpnt->sc_data_direction = DMA_FROM_DEVICE;
|
|
} else {
|
|
scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
|
|
goto out;
|
|
}
|
|
|
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
|
|
"%s %d/%u 512 byte blocks.\n",
|
|
(rq_data_dir(rq) == WRITE) ?
|
|
"writing" : "reading", this_count,
|
|
blk_rq_sectors(rq)));
|
|
|
|
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
|
|
host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
|
|
if (host_dif)
|
|
protect = 1 << 5;
|
|
else
|
|
protect = 0;
|
|
|
|
if (host_dif == SD_DIF_TYPE2_PROTECTION) {
|
|
SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
|
|
|
|
if (unlikely(SCpnt->cmnd == NULL)) {
|
|
ret = BLKPREP_DEFER;
|
|
goto out;
|
|
}
|
|
|
|
SCpnt->cmd_len = SD_EXT_CDB_SIZE;
|
|
memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
|
|
SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
|
|
SCpnt->cmnd[7] = 0x18;
|
|
SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
|
|
SCpnt->cmnd[10] = protect | ((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 (block > 0xffffffff) {
|
|
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) {
|
|
if (this_count > 0xffff)
|
|
this_count = 0xffff;
|
|
|
|
SCpnt->cmnd[0] += READ_10 - READ_6;
|
|
SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
|
|
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
|
|
SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
|
|
SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
|
|
SCpnt->cmnd[5] = (unsigned char) block & 0xff;
|
|
SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
|
|
SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
|
|
SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
|
|
} else {
|
|
if (unlikely(rq->cmd_flags & REQ_FUA)) {
|
|
/*
|
|
* This happens only if this drive failed
|
|
* 10byte rw command with ILLEGAL_REQUEST
|
|
* during operation and thus turned off
|
|
* use_10_for_rw.
|
|
*/
|
|
scmd_printk(KERN_ERR, SCpnt,
|
|
"FUA write on READ/WRITE(6) drive\n");
|
|
goto out;
|
|
}
|
|
|
|
SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
|
|
SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
|
|
SCpnt->cmnd[3] = (unsigned char) block & 0xff;
|
|
SCpnt->cmnd[4] = (unsigned char) this_count;
|
|
SCpnt->cmnd[5] = 0;
|
|
}
|
|
SCpnt->sdb.length = this_count * sdp->sector_size;
|
|
|
|
/* If DIF or DIX is enabled, tell HBA how to handle request */
|
|
if (host_dif || scsi_prot_sg_count(SCpnt))
|
|
sd_prot_op(SCpnt, host_dif);
|
|
|
|
/*
|
|
* We shouldn't disconnect in the middle of a sector, so with a dumb
|
|
* host adapter, it's safe to assume that we can at least transfer
|
|
* this many bytes between each connect / disconnect.
|
|
*/
|
|
SCpnt->transfersize = sdp->sector_size;
|
|
SCpnt->underflow = this_count << 9;
|
|
SCpnt->allowed = SD_MAX_RETRIES;
|
|
|
|
/*
|
|
* This indicates that the command is ready from our end to be
|
|
* queued.
|
|
*/
|
|
ret = BLKPREP_OK;
|
|
out:
|
|
return scsi_prep_return(q, rq, ret);
|
|
}
|
|
|
|
/**
|
|
* sd_open - open a scsi disk device
|
|
* @inode: only i_rdev member may be used
|
|
* @filp: only f_mode and f_flags may be used
|
|
*
|
|
* Returns 0 if successful. Returns a negated errno value in case
|
|
* of error.
|
|
*
|
|
* Note: This can be called from a user context (e.g. fsck(1) )
|
|
* or from within the kernel (e.g. as a result of a mount(1) ).
|
|
* In the latter case @inode and @filp carry an abridged amount
|
|
* of information as noted above.
|
|
**/
|
|
static int sd_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
|
|
struct scsi_device *sdev;
|
|
int retval;
|
|
|
|
if (!sdkp)
|
|
return -ENXIO;
|
|
|
|
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
|
|
|
|
sdev = sdkp->device;
|
|
|
|
/*
|
|
* If the device is in error recovery, wait until it is done.
|
|
* If the device is offline, then disallow any access to it.
|
|
*/
|
|
retval = -ENXIO;
|
|
if (!scsi_block_when_processing_errors(sdev))
|
|
goto error_out;
|
|
|
|
if (sdev->removable || sdkp->write_prot)
|
|
check_disk_change(bdev);
|
|
|
|
/*
|
|
* If the drive is empty, just let the open fail.
|
|
*/
|
|
retval = -ENOMEDIUM;
|
|
if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
|
|
goto error_out;
|
|
|
|
/*
|
|
* If the device has the write protect tab set, have the open fail
|
|
* if the user expects to be able to write to the thing.
|
|
*/
|
|
retval = -EROFS;
|
|
if (sdkp->write_prot && (mode & FMODE_WRITE))
|
|
goto error_out;
|
|
|
|
/*
|
|
* It is possible that the disk changing stuff resulted in
|
|
* the device being taken offline. If this is the case,
|
|
* report this to the user, and don't pretend that the
|
|
* open actually succeeded.
|
|
*/
|
|
retval = -ENXIO;
|
|
if (!scsi_device_online(sdev))
|
|
goto error_out;
|
|
|
|
if (!sdkp->openers++ && sdev->removable) {
|
|
if (scsi_block_when_processing_errors(sdev))
|
|
scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_out:
|
|
scsi_disk_put(sdkp);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* sd_release - invoked when the (last) close(2) is called on this
|
|
* scsi disk.
|
|
* @inode: only i_rdev member may be used
|
|
* @filp: only f_mode and f_flags may be used
|
|
*
|
|
* Returns 0.
|
|
*
|
|
* Note: may block (uninterruptible) if error recovery is underway
|
|
* on this disk.
|
|
**/
|
|
static int sd_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk(disk);
|
|
struct scsi_device *sdev = sdkp->device;
|
|
|
|
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
|
|
|
|
if (!--sdkp->openers && sdev->removable) {
|
|
if (scsi_block_when_processing_errors(sdev))
|
|
scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
|
|
}
|
|
|
|
/*
|
|
* XXX and what if there are packets in flight and this close()
|
|
* XXX is followed by a "rmmod sd_mod"?
|
|
*/
|
|
scsi_disk_put(sdkp);
|
|
return 0;
|
|
}
|
|
|
|
static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
|
|
struct scsi_device *sdp = sdkp->device;
|
|
struct Scsi_Host *host = sdp->host;
|
|
int diskinfo[4];
|
|
|
|
/* default to most commonly used values */
|
|
diskinfo[0] = 0x40; /* 1 << 6 */
|
|
diskinfo[1] = 0x20; /* 1 << 5 */
|
|
diskinfo[2] = sdkp->capacity >> 11;
|
|
|
|
/* override with calculated, extended default, or driver values */
|
|
if (host->hostt->bios_param)
|
|
host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
|
|
else
|
|
scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
|
|
|
|
geo->heads = diskinfo[0];
|
|
geo->sectors = diskinfo[1];
|
|
geo->cylinders = diskinfo[2];
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sd_ioctl - process an ioctl
|
|
* @inode: only i_rdev/i_bdev members may be used
|
|
* @filp: only f_mode and f_flags may be used
|
|
* @cmd: ioctl command number
|
|
* @arg: this is third argument given to ioctl(2) system call.
|
|
* Often contains a pointer.
|
|
*
|
|
* Returns 0 if successful (some ioctls return postive numbers on
|
|
* success as well). Returns a negated errno value in case of error.
|
|
*
|
|
* Note: most ioctls are forward onto the block subsystem or further
|
|
* down in the scsi subsystem.
|
|
**/
|
|
static int sd_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
struct scsi_device *sdp = scsi_disk(disk)->device;
|
|
void __user *p = (void __user *)arg;
|
|
int error;
|
|
|
|
SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
|
|
disk->disk_name, cmd));
|
|
|
|
/*
|
|
* If we are in the middle of error recovery, don't let anyone
|
|
* else try and use this device. Also, if error recovery fails, it
|
|
* may try and take the device offline, in which case all further
|
|
* access to the device is prohibited.
|
|
*/
|
|
error = scsi_nonblockable_ioctl(sdp, cmd, p,
|
|
(mode & FMODE_NDELAY) != 0);
|
|
if (!scsi_block_when_processing_errors(sdp) || !error)
|
|
return error;
|
|
|
|
/*
|
|
* Send SCSI addressing ioctls directly to mid level, send other
|
|
* ioctls to block level and then onto mid level if they can't be
|
|
* resolved.
|
|
*/
|
|
switch (cmd) {
|
|
case SCSI_IOCTL_GET_IDLUN:
|
|
case SCSI_IOCTL_GET_BUS_NUMBER:
|
|
return scsi_ioctl(sdp, cmd, p);
|
|
default:
|
|
error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
|
|
if (error != -ENOTTY)
|
|
return error;
|
|
}
|
|
return scsi_ioctl(sdp, cmd, p);
|
|
}
|
|
|
|
static void set_media_not_present(struct scsi_disk *sdkp)
|
|
{
|
|
sdkp->media_present = 0;
|
|
sdkp->capacity = 0;
|
|
sdkp->device->changed = 1;
|
|
}
|
|
|
|
/**
|
|
* sd_media_changed - check if our medium changed
|
|
* @disk: kernel device descriptor
|
|
*
|
|
* Returns 0 if not applicable or no change; 1 if change
|
|
*
|
|
* Note: this function is invoked from the block subsystem.
|
|
**/
|
|
static int sd_media_changed(struct gendisk *disk)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk(disk);
|
|
struct scsi_device *sdp = sdkp->device;
|
|
struct scsi_sense_hdr *sshdr = NULL;
|
|
int retval;
|
|
|
|
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
|
|
|
|
if (!sdp->removable)
|
|
return 0;
|
|
|
|
/*
|
|
* If the device is offline, don't send any commands - just pretend as
|
|
* if the command failed. If the device ever comes back online, we
|
|
* can deal with it then. It is only because of unrecoverable errors
|
|
* that we would ever take a device offline in the first place.
|
|
*/
|
|
if (!scsi_device_online(sdp)) {
|
|
set_media_not_present(sdkp);
|
|
retval = 1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Using TEST_UNIT_READY enables differentiation between drive with
|
|
* no cartridge loaded - NOT READY, drive with changed cartridge -
|
|
* UNIT ATTENTION, or with same cartridge - GOOD STATUS.
|
|
*
|
|
* Drives that auto spin down. eg iomega jaz 1G, will be started
|
|
* by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
|
|
* sd_revalidate() is called.
|
|
*/
|
|
retval = -ENODEV;
|
|
|
|
if (scsi_block_when_processing_errors(sdp)) {
|
|
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
|
|
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
|
|
sshdr);
|
|
}
|
|
|
|
/*
|
|
* Unable to test, unit probably not ready. This usually
|
|
* means there is no disc in the drive. Mark as changed,
|
|
* and we will figure it out later once the drive is
|
|
* available again.
|
|
*/
|
|
if (retval || (scsi_sense_valid(sshdr) &&
|
|
/* 0x3a is medium not present */
|
|
sshdr->asc == 0x3a)) {
|
|
set_media_not_present(sdkp);
|
|
retval = 1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* For removable scsi disk we have to recognise the presence
|
|
* of a disk in the drive. This is kept in the struct scsi_disk
|
|
* struct and tested at open ! Daniel Roche (dan@lectra.fr)
|
|
*/
|
|
sdkp->media_present = 1;
|
|
|
|
retval = sdp->changed;
|
|
sdp->changed = 0;
|
|
out:
|
|
if (retval != sdkp->previous_state)
|
|
sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
|
|
sdkp->previous_state = retval;
|
|
kfree(sshdr);
|
|
return retval;
|
|
}
|
|
|
|
static int sd_sync_cache(struct scsi_disk *sdkp)
|
|
{
|
|
int retries, res;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
struct scsi_sense_hdr sshdr;
|
|
|
|
if (!scsi_device_online(sdp))
|
|
return -ENODEV;
|
|
|
|
|
|
for (retries = 3; retries > 0; --retries) {
|
|
unsigned char cmd[10] = { 0 };
|
|
|
|
cmd[0] = SYNCHRONIZE_CACHE;
|
|
/*
|
|
* Leave the rest of the command zero to indicate
|
|
* flush everything.
|
|
*/
|
|
res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
|
|
if (res == 0)
|
|
break;
|
|
}
|
|
|
|
if (res) {
|
|
sd_print_result(sdkp, res);
|
|
if (driver_byte(res) & DRIVER_SENSE)
|
|
sd_print_sense_hdr(sdkp, &sshdr);
|
|
}
|
|
|
|
if (res)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static void sd_rescan(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
|
|
if (sdkp) {
|
|
revalidate_disk(sdkp->disk);
|
|
scsi_disk_put(sdkp);
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
/*
|
|
* This gets directly called from VFS. When the ioctl
|
|
* is not recognized we go back to the other translation paths.
|
|
*/
|
|
static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
|
|
|
|
/*
|
|
* If we are in the middle of error recovery, don't let anyone
|
|
* else try and use this device. Also, if error recovery fails, it
|
|
* may try and take the device offline, in which case all further
|
|
* access to the device is prohibited.
|
|
*/
|
|
if (!scsi_block_when_processing_errors(sdev))
|
|
return -ENODEV;
|
|
|
|
if (sdev->host->hostt->compat_ioctl) {
|
|
int ret;
|
|
|
|
ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Let the static ioctl translation table take care of it.
|
|
*/
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
#endif
|
|
|
|
static const struct block_device_operations sd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = sd_open,
|
|
.release = sd_release,
|
|
.locked_ioctl = sd_ioctl,
|
|
.getgeo = sd_getgeo,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = sd_compat_ioctl,
|
|
#endif
|
|
.media_changed = sd_media_changed,
|
|
.revalidate_disk = sd_revalidate_disk,
|
|
.unlock_native_capacity = sd_unlock_native_capacity,
|
|
};
|
|
|
|
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
|
|
{
|
|
u64 start_lba = blk_rq_pos(scmd->request);
|
|
u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
|
|
u64 bad_lba;
|
|
int info_valid;
|
|
|
|
if (scmd->request->cmd_type != REQ_TYPE_FS)
|
|
return 0;
|
|
|
|
info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
|
|
SCSI_SENSE_BUFFERSIZE,
|
|
&bad_lba);
|
|
if (!info_valid)
|
|
return 0;
|
|
|
|
if (scsi_bufflen(scmd) <= scmd->device->sector_size)
|
|
return 0;
|
|
|
|
if (scmd->device->sector_size < 512) {
|
|
/* only legitimate sector_size here is 256 */
|
|
start_lba <<= 1;
|
|
end_lba <<= 1;
|
|
} else {
|
|
/* be careful ... don't want any overflows */
|
|
u64 factor = scmd->device->sector_size / 512;
|
|
do_div(start_lba, factor);
|
|
do_div(end_lba, factor);
|
|
}
|
|
|
|
/* The bad lba was reported incorrectly, we have no idea where
|
|
* the error is.
|
|
*/
|
|
if (bad_lba < start_lba || bad_lba >= end_lba)
|
|
return 0;
|
|
|
|
/* This computation should always be done in terms of
|
|
* the resolution of the device's medium.
|
|
*/
|
|
return (bad_lba - start_lba) * scmd->device->sector_size;
|
|
}
|
|
|
|
/**
|
|
* sd_done - bottom half handler: called when the lower level
|
|
* driver has completed (successfully or otherwise) a scsi command.
|
|
* @SCpnt: mid-level's per command structure.
|
|
*
|
|
* Note: potentially run from within an ISR. Must not block.
|
|
**/
|
|
static int sd_done(struct scsi_cmnd *SCpnt)
|
|
{
|
|
int result = SCpnt->result;
|
|
unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
|
|
struct scsi_sense_hdr sshdr;
|
|
struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
|
|
int sense_valid = 0;
|
|
int sense_deferred = 0;
|
|
|
|
if (result) {
|
|
sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
|
|
if (sense_valid)
|
|
sense_deferred = scsi_sense_is_deferred(&sshdr);
|
|
}
|
|
#ifdef CONFIG_SCSI_LOGGING
|
|
SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
|
|
if (sense_valid) {
|
|
SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
|
|
"sd_done: sb[respc,sk,asc,"
|
|
"ascq]=%x,%x,%x,%x\n",
|
|
sshdr.response_code,
|
|
sshdr.sense_key, sshdr.asc,
|
|
sshdr.ascq));
|
|
}
|
|
#endif
|
|
if (driver_byte(result) != DRIVER_SENSE &&
|
|
(!sense_valid || sense_deferred))
|
|
goto out;
|
|
|
|
switch (sshdr.sense_key) {
|
|
case HARDWARE_ERROR:
|
|
case MEDIUM_ERROR:
|
|
good_bytes = sd_completed_bytes(SCpnt);
|
|
break;
|
|
case RECOVERED_ERROR:
|
|
good_bytes = scsi_bufflen(SCpnt);
|
|
break;
|
|
case NO_SENSE:
|
|
/* This indicates a false check condition, so ignore it. An
|
|
* unknown amount of data was transferred so treat it as an
|
|
* error.
|
|
*/
|
|
scsi_print_sense("sd", SCpnt);
|
|
SCpnt->result = 0;
|
|
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
|
|
break;
|
|
case ABORTED_COMMAND: /* DIF: Target detected corruption */
|
|
case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
|
|
if (sshdr.asc == 0x10)
|
|
good_bytes = sd_completed_bytes(SCpnt);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
out:
|
|
if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
|
|
sd_dif_complete(SCpnt, good_bytes);
|
|
|
|
if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
|
|
== SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
|
|
|
|
/* We have to print a failed command here as the
|
|
* extended CDB gets freed before scsi_io_completion()
|
|
* is called.
|
|
*/
|
|
if (result)
|
|
scsi_print_command(SCpnt);
|
|
|
|
mempool_free(SCpnt->cmnd, sd_cdb_pool);
|
|
SCpnt->cmnd = NULL;
|
|
SCpnt->cmd_len = 0;
|
|
}
|
|
|
|
return good_bytes;
|
|
}
|
|
|
|
static int media_not_present(struct scsi_disk *sdkp,
|
|
struct scsi_sense_hdr *sshdr)
|
|
{
|
|
|
|
if (!scsi_sense_valid(sshdr))
|
|
return 0;
|
|
/* not invoked for commands that could return deferred errors */
|
|
if (sshdr->sense_key != NOT_READY &&
|
|
sshdr->sense_key != UNIT_ATTENTION)
|
|
return 0;
|
|
if (sshdr->asc != 0x3A) /* medium not present */
|
|
return 0;
|
|
|
|
set_media_not_present(sdkp);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* spinup disk - called only in sd_revalidate_disk()
|
|
*/
|
|
static void
|
|
sd_spinup_disk(struct scsi_disk *sdkp)
|
|
{
|
|
unsigned char cmd[10];
|
|
unsigned long spintime_expire = 0;
|
|
int retries, spintime;
|
|
unsigned int the_result;
|
|
struct scsi_sense_hdr sshdr;
|
|
int sense_valid = 0;
|
|
|
|
spintime = 0;
|
|
|
|
/* Spin up drives, as required. Only do this at boot time */
|
|
/* Spinup needs to be done for module loads too. */
|
|
do {
|
|
retries = 0;
|
|
|
|
do {
|
|
cmd[0] = TEST_UNIT_READY;
|
|
memset((void *) &cmd[1], 0, 9);
|
|
|
|
the_result = scsi_execute_req(sdkp->device, cmd,
|
|
DMA_NONE, NULL, 0,
|
|
&sshdr, SD_TIMEOUT,
|
|
SD_MAX_RETRIES, NULL);
|
|
|
|
/*
|
|
* If the drive has indicated to us that it
|
|
* doesn't have any media in it, don't bother
|
|
* with any more polling.
|
|
*/
|
|
if (media_not_present(sdkp, &sshdr))
|
|
return;
|
|
|
|
if (the_result)
|
|
sense_valid = scsi_sense_valid(&sshdr);
|
|
retries++;
|
|
} while (retries < 3 &&
|
|
(!scsi_status_is_good(the_result) ||
|
|
((driver_byte(the_result) & DRIVER_SENSE) &&
|
|
sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
|
|
|
|
if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
|
|
/* no sense, TUR either succeeded or failed
|
|
* with a status error */
|
|
if(!spintime && !scsi_status_is_good(the_result)) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
|
|
sd_print_result(sdkp, the_result);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The device does not want the automatic start to be issued.
|
|
*/
|
|
if (sdkp->device->no_start_on_add)
|
|
break;
|
|
|
|
if (sense_valid && sshdr.sense_key == NOT_READY) {
|
|
if (sshdr.asc == 4 && sshdr.ascq == 3)
|
|
break; /* manual intervention required */
|
|
if (sshdr.asc == 4 && sshdr.ascq == 0xb)
|
|
break; /* standby */
|
|
if (sshdr.asc == 4 && sshdr.ascq == 0xc)
|
|
break; /* unavailable */
|
|
/*
|
|
* Issue command to spin up drive when not ready
|
|
*/
|
|
if (!spintime) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
|
|
cmd[0] = START_STOP;
|
|
cmd[1] = 1; /* Return immediately */
|
|
memset((void *) &cmd[2], 0, 8);
|
|
cmd[4] = 1; /* Start spin cycle */
|
|
if (sdkp->device->start_stop_pwr_cond)
|
|
cmd[4] |= 1 << 4;
|
|
scsi_execute_req(sdkp->device, cmd, DMA_NONE,
|
|
NULL, 0, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES,
|
|
NULL);
|
|
spintime_expire = jiffies + 100 * HZ;
|
|
spintime = 1;
|
|
}
|
|
/* Wait 1 second for next try */
|
|
msleep(1000);
|
|
printk(".");
|
|
|
|
/*
|
|
* Wait for USB flash devices with slow firmware.
|
|
* Yes, this sense key/ASC combination shouldn't
|
|
* occur here. It's characteristic of these devices.
|
|
*/
|
|
} else if (sense_valid &&
|
|
sshdr.sense_key == UNIT_ATTENTION &&
|
|
sshdr.asc == 0x28) {
|
|
if (!spintime) {
|
|
spintime_expire = jiffies + 5 * HZ;
|
|
spintime = 1;
|
|
}
|
|
/* Wait 1 second for next try */
|
|
msleep(1000);
|
|
} else {
|
|
/* we don't understand the sense code, so it's
|
|
* probably pointless to loop */
|
|
if(!spintime) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
|
|
sd_print_sense_hdr(sdkp, &sshdr);
|
|
}
|
|
break;
|
|
}
|
|
|
|
} while (spintime && time_before_eq(jiffies, spintime_expire));
|
|
|
|
if (spintime) {
|
|
if (scsi_status_is_good(the_result))
|
|
printk("ready\n");
|
|
else
|
|
printk("not responding...\n");
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Determine whether disk supports Data Integrity Field.
|
|
*/
|
|
void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
struct scsi_device *sdp = sdkp->device;
|
|
u8 type;
|
|
|
|
if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
|
|
return;
|
|
|
|
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
|
|
|
|
if (type == sdkp->protection_type || !sdkp->first_scan)
|
|
return;
|
|
|
|
sdkp->protection_type = type;
|
|
|
|
if (type > SD_DIF_TYPE3_PROTECTION) {
|
|
sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
|
|
"protection type %u. Disabling disk!\n", type);
|
|
sdkp->capacity = 0;
|
|
return;
|
|
}
|
|
|
|
if (scsi_host_dif_capable(sdp->host, type))
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Enabling DIF Type %u protection\n", type);
|
|
else
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Disabling DIF Type %u protection\n", type);
|
|
}
|
|
|
|
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
|
|
struct scsi_sense_hdr *sshdr, int sense_valid,
|
|
int the_result)
|
|
{
|
|
sd_print_result(sdkp, the_result);
|
|
if (driver_byte(the_result) & DRIVER_SENSE)
|
|
sd_print_sense_hdr(sdkp, sshdr);
|
|
else
|
|
sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
|
|
|
|
/*
|
|
* Set dirty bit for removable devices if not ready -
|
|
* sometimes drives will not report this properly.
|
|
*/
|
|
if (sdp->removable &&
|
|
sense_valid && sshdr->sense_key == NOT_READY)
|
|
sdp->changed = 1;
|
|
|
|
/*
|
|
* We used to set media_present to 0 here to indicate no media
|
|
* in the drive, but some drives fail read capacity even with
|
|
* media present, so we can't do that.
|
|
*/
|
|
sdkp->capacity = 0; /* unknown mapped to zero - as usual */
|
|
}
|
|
|
|
#define RC16_LEN 32
|
|
#if RC16_LEN > SD_BUF_SIZE
|
|
#error RC16_LEN must not be more than SD_BUF_SIZE
|
|
#endif
|
|
|
|
#define READ_CAPACITY_RETRIES_ON_RESET 10
|
|
|
|
static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
|
|
unsigned char *buffer)
|
|
{
|
|
unsigned char cmd[16];
|
|
struct scsi_sense_hdr sshdr;
|
|
int sense_valid = 0;
|
|
int the_result;
|
|
int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
|
|
unsigned int alignment;
|
|
unsigned long long lba;
|
|
unsigned sector_size;
|
|
|
|
do {
|
|
memset(cmd, 0, 16);
|
|
cmd[0] = SERVICE_ACTION_IN;
|
|
cmd[1] = SAI_READ_CAPACITY_16;
|
|
cmd[13] = RC16_LEN;
|
|
memset(buffer, 0, RC16_LEN);
|
|
|
|
the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
|
|
buffer, RC16_LEN, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
|
|
|
|
if (media_not_present(sdkp, &sshdr))
|
|
return -ENODEV;
|
|
|
|
if (the_result) {
|
|
sense_valid = scsi_sense_valid(&sshdr);
|
|
if (sense_valid &&
|
|
sshdr.sense_key == ILLEGAL_REQUEST &&
|
|
(sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
|
|
sshdr.ascq == 0x00)
|
|
/* Invalid Command Operation Code or
|
|
* Invalid Field in CDB, just retry
|
|
* silently with RC10 */
|
|
return -EINVAL;
|
|
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_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
|
|
read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sector_size = get_unaligned_be32(&buffer[8]);
|
|
lba = get_unaligned_be64(&buffer[0]);
|
|
|
|
sd_read_protection_type(sdkp, buffer);
|
|
|
|
if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
|
|
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
|
|
"kernel compiled with support for large block "
|
|
"devices.\n");
|
|
sdkp->capacity = 0;
|
|
return -EOVERFLOW;
|
|
}
|
|
|
|
/* Logical blocks per physical block exponent */
|
|
sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
|
|
|
|
/* Lowest aligned logical block */
|
|
alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
|
|
blk_queue_alignment_offset(sdp->request_queue, alignment);
|
|
if (alignment && sdkp->first_scan)
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"physical block alignment offset: %u\n", alignment);
|
|
|
|
if (buffer[14] & 0x80) { /* TPE */
|
|
struct request_queue *q = sdp->request_queue;
|
|
|
|
sdkp->thin_provisioning = 1;
|
|
q->limits.discard_granularity = sdkp->hw_sector_size;
|
|
q->limits.max_discard_sectors = 0xffffffff;
|
|
|
|
if (buffer[14] & 0x40) /* TPRZ */
|
|
q->limits.discard_zeroes_data = 1;
|
|
|
|
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
|
|
}
|
|
|
|
sdkp->capacity = lba + 1;
|
|
return sector_size;
|
|
}
|
|
|
|
static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
|
|
unsigned char *buffer)
|
|
{
|
|
unsigned char cmd[16];
|
|
struct scsi_sense_hdr sshdr;
|
|
int sense_valid = 0;
|
|
int the_result;
|
|
int retries = 3, 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_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
|
|
read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sector_size = get_unaligned_be32(&buffer[4]);
|
|
lba = get_unaligned_be32(&buffer[0]);
|
|
|
|
if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
|
|
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
|
|
"kernel compiled with support for large block "
|
|
"devices.\n");
|
|
sdkp->capacity = 0;
|
|
return -EOVERFLOW;
|
|
}
|
|
|
|
sdkp->capacity = lba + 1;
|
|
sdkp->hw_sector_size = sector_size;
|
|
return sector_size;
|
|
}
|
|
|
|
static int sd_try_rc16_first(struct scsi_device *sdp)
|
|
{
|
|
if (sdp->host->max_cmd_len < 16)
|
|
return 0;
|
|
if (sdp->scsi_level > SCSI_SPC_2)
|
|
return 1;
|
|
if (scsi_device_protection(sdp))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* read disk capacity
|
|
*/
|
|
static void
|
|
sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
int sector_size;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
sector_t old_capacity = sdkp->capacity;
|
|
|
|
if (sd_try_rc16_first(sdp)) {
|
|
sector_size = read_capacity_16(sdkp, sdp, buffer);
|
|
if (sector_size == -EOVERFLOW)
|
|
goto got_data;
|
|
if (sector_size == -ENODEV)
|
|
return;
|
|
if (sector_size < 0)
|
|
sector_size = read_capacity_10(sdkp, sdp, buffer);
|
|
if (sector_size < 0)
|
|
return;
|
|
} else {
|
|
sector_size = read_capacity_10(sdkp, sdp, buffer);
|
|
if (sector_size == -EOVERFLOW)
|
|
goto got_data;
|
|
if (sector_size < 0)
|
|
return;
|
|
if ((sizeof(sdkp->capacity) > 4) &&
|
|
(sdkp->capacity > 0xffffffffULL)) {
|
|
int old_sector_size = sector_size;
|
|
sd_printk(KERN_NOTICE, sdkp, "Very big device. "
|
|
"Trying to use READ CAPACITY(16).\n");
|
|
sector_size = read_capacity_16(sdkp, sdp, buffer);
|
|
if (sector_size < 0) {
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Using 0xffffffff as device size\n");
|
|
sdkp->capacity = 1 + (sector_t) 0xffffffff;
|
|
sector_size = old_sector_size;
|
|
goto got_data;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Some devices are known to return the total number of blocks,
|
|
* not the highest block number. Some devices have versions
|
|
* which do this and others which do not. Some devices we might
|
|
* suspect of doing this but we don't know for certain.
|
|
*
|
|
* If we know the reported capacity is wrong, decrement it. If
|
|
* we can only guess, then assume the number of blocks is even
|
|
* (usually true but not always) and err on the side of lowering
|
|
* the capacity.
|
|
*/
|
|
if (sdp->fix_capacity ||
|
|
(sdp->guess_capacity && (sdkp->capacity & 0x01))) {
|
|
sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
|
|
"from its reported value: %llu\n",
|
|
(unsigned long long) sdkp->capacity);
|
|
--sdkp->capacity;
|
|
}
|
|
|
|
got_data:
|
|
if (sector_size == 0) {
|
|
sector_size = 512;
|
|
sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
|
|
"assuming 512.\n");
|
|
}
|
|
|
|
if (sector_size != 512 &&
|
|
sector_size != 1024 &&
|
|
sector_size != 2048 &&
|
|
sector_size != 4096 &&
|
|
sector_size != 256) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
|
|
sector_size);
|
|
/*
|
|
* The user might want to re-format the drive with
|
|
* a supported sectorsize. Once this happens, it
|
|
* would be relatively trivial to set the thing up.
|
|
* For this reason, we leave the thing in the table.
|
|
*/
|
|
sdkp->capacity = 0;
|
|
/*
|
|
* set a bogus sector size so the normal read/write
|
|
* logic in the block layer will eventually refuse any
|
|
* request on this device without tripping over power
|
|
* of two sector size assumptions
|
|
*/
|
|
sector_size = 512;
|
|
}
|
|
blk_queue_logical_block_size(sdp->request_queue, sector_size);
|
|
|
|
{
|
|
char cap_str_2[10], cap_str_10[10];
|
|
u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
|
|
|
|
string_get_size(sz, STRING_UNITS_2, cap_str_2,
|
|
sizeof(cap_str_2));
|
|
string_get_size(sz, STRING_UNITS_10, cap_str_10,
|
|
sizeof(cap_str_10));
|
|
|
|
if (sdkp->first_scan || old_capacity != sdkp->capacity) {
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"%llu %d-byte logical blocks: (%s/%s)\n",
|
|
(unsigned long long)sdkp->capacity,
|
|
sector_size, cap_str_10, cap_str_2);
|
|
|
|
if (sdkp->hw_sector_size != sector_size)
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"%u-byte physical blocks\n",
|
|
sdkp->hw_sector_size);
|
|
}
|
|
}
|
|
|
|
/* Rescale capacity to 512-byte units */
|
|
if (sector_size == 4096)
|
|
sdkp->capacity <<= 3;
|
|
else if (sector_size == 2048)
|
|
sdkp->capacity <<= 2;
|
|
else if (sector_size == 1024)
|
|
sdkp->capacity <<= 1;
|
|
else if (sector_size == 256)
|
|
sdkp->capacity >>= 1;
|
|
|
|
blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
|
|
sdkp->device->sector_size = sector_size;
|
|
}
|
|
|
|
/* called with buffer of length 512 */
|
|
static inline int
|
|
sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
|
|
unsigned char *buffer, int len, struct scsi_mode_data *data,
|
|
struct scsi_sense_hdr *sshdr)
|
|
{
|
|
return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
|
|
SD_TIMEOUT, SD_MAX_RETRIES, data,
|
|
sshdr);
|
|
}
|
|
|
|
/*
|
|
* read write protect setting, if possible - called only in sd_revalidate_disk()
|
|
* called with buffer of length SD_BUF_SIZE
|
|
*/
|
|
static void
|
|
sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
int res;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
struct scsi_mode_data data;
|
|
int old_wp = sdkp->write_prot;
|
|
|
|
set_disk_ro(sdkp->disk, 0);
|
|
if (sdp->skip_ms_page_3f) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
|
|
return;
|
|
}
|
|
|
|
if (sdp->use_192_bytes_for_3f) {
|
|
res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
|
|
} else {
|
|
/*
|
|
* First attempt: ask for all pages (0x3F), but only 4 bytes.
|
|
* We have to start carefully: some devices hang if we ask
|
|
* for more than is available.
|
|
*/
|
|
res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
|
|
|
|
/*
|
|
* Second attempt: ask for page 0 When only page 0 is
|
|
* implemented, a request for page 3F may return Sense Key
|
|
* 5: Illegal Request, Sense Code 24: Invalid field in
|
|
* CDB.
|
|
*/
|
|
if (!scsi_status_is_good(res))
|
|
res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
|
|
|
|
/*
|
|
* Third attempt: ask 255 bytes, as we did earlier.
|
|
*/
|
|
if (!scsi_status_is_good(res))
|
|
res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
|
|
&data, NULL);
|
|
}
|
|
|
|
if (!scsi_status_is_good(res)) {
|
|
sd_printk(KERN_WARNING, sdkp,
|
|
"Test WP failed, assume Write Enabled\n");
|
|
} else {
|
|
sdkp->write_prot = ((data.device_specific & 0x80) != 0);
|
|
set_disk_ro(sdkp->disk, sdkp->write_prot);
|
|
if (sdkp->first_scan || old_wp != sdkp->write_prot) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
|
|
sdkp->write_prot ? "on" : "off");
|
|
sd_printk(KERN_DEBUG, sdkp,
|
|
"Mode Sense: %02x %02x %02x %02x\n",
|
|
buffer[0], buffer[1], buffer[2], buffer[3]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* sd_read_cache_type - called only from sd_revalidate_disk()
|
|
* called with buffer of length SD_BUF_SIZE
|
|
*/
|
|
static void
|
|
sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
int len = 0, res;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
|
|
int dbd;
|
|
int modepage;
|
|
struct scsi_mode_data data;
|
|
struct scsi_sense_hdr sshdr;
|
|
int old_wce = sdkp->WCE;
|
|
int old_rcd = sdkp->RCD;
|
|
int old_dpofua = sdkp->DPOFUA;
|
|
|
|
if (sdp->skip_ms_page_8)
|
|
goto defaults;
|
|
|
|
if (sdp->type == TYPE_RBC) {
|
|
modepage = 6;
|
|
dbd = 8;
|
|
} else {
|
|
modepage = 8;
|
|
dbd = 0;
|
|
}
|
|
|
|
/* cautiously ask */
|
|
res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
|
|
|
|
if (!scsi_status_is_good(res))
|
|
goto bad_sense;
|
|
|
|
if (!data.header_length) {
|
|
modepage = 6;
|
|
sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
|
|
}
|
|
|
|
/* that went OK, now ask for the proper length */
|
|
len = data.length;
|
|
|
|
/*
|
|
* We're only interested in the first three bytes, actually.
|
|
* But the data cache page is defined for the first 20.
|
|
*/
|
|
if (len < 3)
|
|
goto bad_sense;
|
|
if (len > 20)
|
|
len = 20;
|
|
|
|
/* Take headers and block descriptors into account */
|
|
len += data.header_length + data.block_descriptor_length;
|
|
if (len > SD_BUF_SIZE)
|
|
goto bad_sense;
|
|
|
|
/* Get the data */
|
|
res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
|
|
|
|
if (scsi_status_is_good(res)) {
|
|
int offset = data.header_length + data.block_descriptor_length;
|
|
|
|
if (offset >= SD_BUF_SIZE - 2) {
|
|
sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
|
|
goto defaults;
|
|
}
|
|
|
|
if ((buffer[offset] & 0x3f) != modepage) {
|
|
sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
|
|
goto defaults;
|
|
}
|
|
|
|
if (modepage == 8) {
|
|
sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
|
|
sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
|
|
} else {
|
|
sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
|
|
sdkp->RCD = 0;
|
|
}
|
|
|
|
sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
|
|
if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Uses READ/WRITE(6), disabling FUA\n");
|
|
sdkp->DPOFUA = 0;
|
|
}
|
|
|
|
if (sdkp->first_scan || old_wce != sdkp->WCE ||
|
|
old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Write cache: %s, read cache: %s, %s\n",
|
|
sdkp->WCE ? "enabled" : "disabled",
|
|
sdkp->RCD ? "disabled" : "enabled",
|
|
sdkp->DPOFUA ? "supports DPO and FUA"
|
|
: "doesn't support DPO or FUA");
|
|
|
|
return;
|
|
}
|
|
|
|
bad_sense:
|
|
if (scsi_sense_valid(&sshdr) &&
|
|
sshdr.sense_key == ILLEGAL_REQUEST &&
|
|
sshdr.asc == 0x24 && sshdr.ascq == 0x0)
|
|
/* Invalid field in CDB */
|
|
sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
|
|
else
|
|
sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
|
|
|
|
defaults:
|
|
sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
|
|
sdkp->WCE = 0;
|
|
sdkp->RCD = 0;
|
|
sdkp->DPOFUA = 0;
|
|
}
|
|
|
|
/*
|
|
* The ATO bit indicates whether the DIF application tag is available
|
|
* for use by the operating system.
|
|
*/
|
|
void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
int res, offset;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
struct scsi_mode_data data;
|
|
struct scsi_sense_hdr sshdr;
|
|
|
|
if (sdp->type != TYPE_DISK)
|
|
return;
|
|
|
|
if (sdkp->protection_type == 0)
|
|
return;
|
|
|
|
res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
|
|
SD_MAX_RETRIES, &data, &sshdr);
|
|
|
|
if (!scsi_status_is_good(res) || !data.header_length ||
|
|
data.length < 6) {
|
|
sd_printk(KERN_WARNING, sdkp,
|
|
"getting Control mode page failed, assume no ATO\n");
|
|
|
|
if (scsi_sense_valid(&sshdr))
|
|
sd_print_sense_hdr(sdkp, &sshdr);
|
|
|
|
return;
|
|
}
|
|
|
|
offset = data.header_length + data.block_descriptor_length;
|
|
|
|
if ((buffer[offset] & 0x3f) != 0x0a) {
|
|
sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
|
|
return;
|
|
}
|
|
|
|
if ((buffer[offset + 5] & 0x80) == 0)
|
|
return;
|
|
|
|
sdkp->ATO = 1;
|
|
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* sd_read_block_limits - Query disk device for preferred I/O sizes.
|
|
* @disk: disk to query
|
|
*/
|
|
static void sd_read_block_limits(struct scsi_disk *sdkp)
|
|
{
|
|
struct request_queue *q = sdkp->disk->queue;
|
|
unsigned int sector_sz = sdkp->device->sector_size;
|
|
const int vpd_len = 64;
|
|
unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
|
|
|
|
if (!buffer ||
|
|
/* Block Limits VPD */
|
|
scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
|
|
goto out;
|
|
|
|
blk_queue_io_min(sdkp->disk->queue,
|
|
get_unaligned_be16(&buffer[6]) * sector_sz);
|
|
blk_queue_io_opt(sdkp->disk->queue,
|
|
get_unaligned_be32(&buffer[12]) * sector_sz);
|
|
|
|
/* Thin provisioning enabled and page length indicates TP support */
|
|
if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
|
|
unsigned int lba_count, desc_count, granularity;
|
|
|
|
lba_count = get_unaligned_be32(&buffer[20]);
|
|
desc_count = get_unaligned_be32(&buffer[24]);
|
|
|
|
if (lba_count) {
|
|
q->limits.max_discard_sectors =
|
|
lba_count * sector_sz >> 9;
|
|
|
|
if (desc_count)
|
|
sdkp->unmap = 1;
|
|
}
|
|
|
|
granularity = get_unaligned_be32(&buffer[28]);
|
|
|
|
if (granularity)
|
|
q->limits.discard_granularity = granularity * sector_sz;
|
|
|
|
if (buffer[32] & 0x80)
|
|
q->limits.discard_alignment =
|
|
get_unaligned_be32(&buffer[32]) & ~(1 << 31);
|
|
}
|
|
|
|
out:
|
|
kfree(buffer);
|
|
}
|
|
|
|
/**
|
|
* sd_read_block_characteristics - Query block dev. characteristics
|
|
* @disk: disk to query
|
|
*/
|
|
static void sd_read_block_characteristics(struct scsi_disk *sdkp)
|
|
{
|
|
unsigned char *buffer;
|
|
u16 rot;
|
|
const int vpd_len = 64;
|
|
|
|
buffer = kmalloc(vpd_len, GFP_KERNEL);
|
|
|
|
if (!buffer ||
|
|
/* Block Device Characteristics VPD */
|
|
scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
|
|
goto out;
|
|
|
|
rot = get_unaligned_be16(&buffer[4]);
|
|
|
|
if (rot == 1)
|
|
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
|
|
|
|
out:
|
|
kfree(buffer);
|
|
}
|
|
|
|
static int sd_try_extended_inquiry(struct scsi_device *sdp)
|
|
{
|
|
/*
|
|
* Although VPD inquiries can go to SCSI-2 type devices,
|
|
* some USB ones crash on receiving them, and the pages
|
|
* we currently ask for are for SPC-3 and beyond
|
|
*/
|
|
if (sdp->scsi_level > SCSI_SPC_2)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sd_revalidate_disk - called the first time a new disk is seen,
|
|
* performs disk spin up, read_capacity, etc.
|
|
* @disk: struct gendisk we care about
|
|
**/
|
|
static int sd_revalidate_disk(struct gendisk *disk)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk(disk);
|
|
struct scsi_device *sdp = sdkp->device;
|
|
unsigned char *buffer;
|
|
unsigned ordered;
|
|
|
|
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
|
|
"sd_revalidate_disk\n"));
|
|
|
|
/*
|
|
* If the device is offline, don't try and read capacity or any
|
|
* of the other niceties.
|
|
*/
|
|
if (!scsi_device_online(sdp))
|
|
goto out;
|
|
|
|
buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
|
|
if (!buffer) {
|
|
sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
|
|
"allocation failure.\n");
|
|
goto out;
|
|
}
|
|
|
|
sd_spinup_disk(sdkp);
|
|
|
|
/*
|
|
* Without media there is no reason to ask; moreover, some devices
|
|
* react badly if we do.
|
|
*/
|
|
if (sdkp->media_present) {
|
|
sd_read_capacity(sdkp, buffer);
|
|
|
|
if (sd_try_extended_inquiry(sdp)) {
|
|
sd_read_block_limits(sdkp);
|
|
sd_read_block_characteristics(sdkp);
|
|
}
|
|
|
|
sd_read_write_protect_flag(sdkp, buffer);
|
|
sd_read_cache_type(sdkp, buffer);
|
|
sd_read_app_tag_own(sdkp, buffer);
|
|
}
|
|
|
|
sdkp->first_scan = 0;
|
|
|
|
/*
|
|
* We now have all cache related info, determine how we deal
|
|
* with ordered requests. Note that as the current SCSI
|
|
* dispatch function can alter request order, we cannot use
|
|
* QUEUE_ORDERED_TAG_* even when ordered tag is supported.
|
|
*/
|
|
if (sdkp->WCE)
|
|
ordered = sdkp->DPOFUA
|
|
? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
|
|
else
|
|
ordered = QUEUE_ORDERED_DRAIN;
|
|
|
|
blk_queue_ordered(sdkp->disk->queue, ordered, NULL);
|
|
|
|
set_capacity(disk, sdkp->capacity);
|
|
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;
|
|
|
|
if (index < SD_MAX_DISKS) {
|
|
gd->major = sd_major((index & 0xf0) >> 4);
|
|
gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
|
|
gd->minors = SD_MINORS;
|
|
}
|
|
gd->fops = &sd_fops;
|
|
gd->private_data = &sdkp->driver;
|
|
gd->queue = sdkp->device->request_queue;
|
|
|
|
/* defaults, until the device tells us otherwise */
|
|
sdp->sector_size = 512;
|
|
sdkp->capacity = 0;
|
|
sdkp->media_present = 1;
|
|
sdkp->write_prot = 0;
|
|
sdkp->WCE = 0;
|
|
sdkp->RCD = 0;
|
|
sdkp->ATO = 0;
|
|
sdkp->first_scan = 1;
|
|
|
|
sd_revalidate_disk(gd);
|
|
|
|
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
|
|
blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
|
|
|
|
gd->driverfs_dev = &sdp->sdev_gendev;
|
|
gd->flags = GENHD_FL_EXT_DEVT;
|
|
if (sdp->removable)
|
|
gd->flags |= GENHD_FL_REMOVABLE;
|
|
|
|
dev_set_drvdata(dev, sdkp);
|
|
add_disk(gd);
|
|
sd_dif_config_host(sdkp);
|
|
|
|
sd_revalidate_disk(gd);
|
|
|
|
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
|
|
sdp->removable ? "removable " : "");
|
|
put_device(&sdkp->dev);
|
|
}
|
|
|
|
/**
|
|
* sd_probe - called during driver initialization and whenever a
|
|
* new scsi device is attached to the system. It is called once
|
|
* for each scsi device (not just disks) present.
|
|
* @dev: pointer to device object
|
|
*
|
|
* Returns 0 if successful (or not interested in this scsi device
|
|
* (e.g. scanner)); 1 when there is an error.
|
|
*
|
|
* Note: this function is invoked from the scsi mid-level.
|
|
* This function sets up the mapping between a given
|
|
* <host,channel,id,lun> (found in sdp) and new device name
|
|
* (e.g. /dev/sda). More precisely it is the block device major
|
|
* and minor number that is chosen here.
|
|
*
|
|
* Assume sd_attach is not re-entrant (for time being)
|
|
* Also think about sd_attach() and sd_remove() running coincidentally.
|
|
**/
|
|
static int sd_probe(struct device *dev)
|
|
{
|
|
struct scsi_device *sdp = to_scsi_device(dev);
|
|
struct scsi_disk *sdkp;
|
|
struct gendisk *gd;
|
|
u32 index;
|
|
int error;
|
|
|
|
error = -ENODEV;
|
|
if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
|
|
goto out;
|
|
|
|
SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
|
|
"sd_attach\n"));
|
|
|
|
error = -ENOMEM;
|
|
sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
|
|
if (!sdkp)
|
|
goto out;
|
|
|
|
gd = alloc_disk(SD_MINORS);
|
|
if (!gd)
|
|
goto out_free;
|
|
|
|
do {
|
|
if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
|
|
goto out_put;
|
|
|
|
spin_lock(&sd_index_lock);
|
|
error = ida_get_new(&sd_index_ida, &index);
|
|
spin_unlock(&sd_index_lock);
|
|
} while (error == -EAGAIN);
|
|
|
|
if (error)
|
|
goto out_put;
|
|
|
|
error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
|
|
if (error)
|
|
goto out_free_index;
|
|
|
|
sdkp->device = sdp;
|
|
sdkp->driver = &sd_template;
|
|
sdkp->disk = gd;
|
|
sdkp->index = index;
|
|
sdkp->openers = 0;
|
|
sdkp->previous_state = 1;
|
|
|
|
if (!sdp->request_queue->rq_timeout) {
|
|
if (sdp->type != TYPE_MOD)
|
|
blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
|
|
else
|
|
blk_queue_rq_timeout(sdp->request_queue,
|
|
SD_MOD_TIMEOUT);
|
|
}
|
|
|
|
device_initialize(&sdkp->dev);
|
|
sdkp->dev.parent = &sdp->sdev_gendev;
|
|
sdkp->dev.class = &sd_disk_class;
|
|
dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
|
|
|
|
if (device_add(&sdkp->dev))
|
|
goto out_free_index;
|
|
|
|
get_device(&sdp->sdev_gendev);
|
|
|
|
get_device(&sdkp->dev); /* prevent release before async_schedule */
|
|
async_schedule(sd_probe_async, sdkp);
|
|
|
|
return 0;
|
|
|
|
out_free_index:
|
|
spin_lock(&sd_index_lock);
|
|
ida_remove(&sd_index_ida, index);
|
|
spin_unlock(&sd_index_lock);
|
|
out_put:
|
|
put_disk(gd);
|
|
out_free:
|
|
kfree(sdkp);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* sd_remove - called whenever a scsi disk (previously recognized by
|
|
* sd_probe) is detached from the system. It is called (potentially
|
|
* multiple times) during sd module unload.
|
|
* @sdp: pointer to mid level scsi device object
|
|
*
|
|
* Note: this function is invoked from the scsi mid-level.
|
|
* This function potentially frees up a device name (e.g. /dev/sdc)
|
|
* that could be re-used by a subsequent sd_probe().
|
|
* This function is not called when the built-in sd driver is "exit-ed".
|
|
**/
|
|
static int sd_remove(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp;
|
|
|
|
async_synchronize_full();
|
|
sdkp = dev_get_drvdata(dev);
|
|
blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
|
|
device_del(&sdkp->dev);
|
|
del_gendisk(sdkp->disk);
|
|
sd_shutdown(dev);
|
|
|
|
mutex_lock(&sd_ref_mutex);
|
|
dev_set_drvdata(dev, NULL);
|
|
put_device(&sdkp->dev);
|
|
mutex_unlock(&sd_ref_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* scsi_disk_release - Called to free the scsi_disk structure
|
|
* @dev: pointer to embedded class device
|
|
*
|
|
* sd_ref_mutex must be held entering this routine. Because it is
|
|
* called on last put, you should always use the scsi_disk_get()
|
|
* scsi_disk_put() helpers which manipulate the semaphore directly
|
|
* and never do a direct put_device.
|
|
**/
|
|
static void scsi_disk_release(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp = to_scsi_disk(dev);
|
|
struct gendisk *disk = sdkp->disk;
|
|
|
|
spin_lock(&sd_index_lock);
|
|
ida_remove(&sd_index_ida, sdkp->index);
|
|
spin_unlock(&sd_index_lock);
|
|
|
|
disk->private_data = NULL;
|
|
put_disk(disk);
|
|
put_device(&sdkp->device->sdev_gendev);
|
|
|
|
kfree(sdkp);
|
|
}
|
|
|
|
static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
|
|
{
|
|
unsigned char cmd[6] = { START_STOP }; /* START_VALID */
|
|
struct scsi_sense_hdr sshdr;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
int res;
|
|
|
|
if (start)
|
|
cmd[4] |= 1; /* START */
|
|
|
|
if (sdp->start_stop_pwr_cond)
|
|
cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
|
|
|
|
if (!scsi_device_online(sdp))
|
|
return -ENODEV;
|
|
|
|
res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
|
|
if (res) {
|
|
sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
|
|
sd_print_result(sdkp, res);
|
|
if (driver_byte(res) & DRIVER_SENSE)
|
|
sd_print_sense_hdr(sdkp, &sshdr);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Send a SYNCHRONIZE CACHE instruction down to the device through
|
|
* the normal SCSI command structure. Wait for the command to
|
|
* complete.
|
|
*/
|
|
static void sd_shutdown(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
|
|
if (!sdkp)
|
|
return; /* this can happen */
|
|
|
|
if (sdkp->WCE) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
|
|
sd_sync_cache(sdkp);
|
|
}
|
|
|
|
if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
|
|
sd_start_stop_device(sdkp, 0);
|
|
}
|
|
|
|
scsi_disk_put(sdkp);
|
|
}
|
|
|
|
static int sd_suspend(struct device *dev, pm_message_t mesg)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
int ret = 0;
|
|
|
|
if (!sdkp)
|
|
return 0; /* this can happen */
|
|
|
|
if (sdkp->WCE) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
|
|
ret = sd_sync_cache(sdkp);
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
|
|
if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
|
|
ret = sd_start_stop_device(sdkp, 0);
|
|
}
|
|
|
|
done:
|
|
scsi_disk_put(sdkp);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_resume(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
int ret = 0;
|
|
|
|
if (!sdkp->device->manage_start_stop)
|
|
goto done;
|
|
|
|
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
|
|
ret = sd_start_stop_device(sdkp, 1);
|
|
|
|
done:
|
|
scsi_disk_put(sdkp);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* init_sd - entry point for this driver (both when built in or when
|
|
* a module).
|
|
*
|
|
* Note: this function registers this driver with the scsi mid-level.
|
|
**/
|
|
static int __init init_sd(void)
|
|
{
|
|
int majors = 0, i, err;
|
|
|
|
SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
|
|
|
|
for (i = 0; i < SD_MAJORS; i++)
|
|
if (register_blkdev(sd_major(i), "sd") == 0)
|
|
majors++;
|
|
|
|
if (!majors)
|
|
return -ENODEV;
|
|
|
|
err = class_register(&sd_disk_class);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
err = scsi_register_driver(&sd_template.gendrv);
|
|
if (err)
|
|
goto err_out_class;
|
|
|
|
sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
|
|
0, 0, NULL);
|
|
if (!sd_cdb_cache) {
|
|
printk(KERN_ERR "sd: can't init extended cdb cache\n");
|
|
goto err_out_class;
|
|
}
|
|
|
|
sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
|
|
if (!sd_cdb_pool) {
|
|
printk(KERN_ERR "sd: can't init extended cdb pool\n");
|
|
goto err_out_cache;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_out_cache:
|
|
kmem_cache_destroy(sd_cdb_cache);
|
|
|
|
err_out_class:
|
|
class_unregister(&sd_disk_class);
|
|
err_out:
|
|
for (i = 0; i < SD_MAJORS; i++)
|
|
unregister_blkdev(sd_major(i), "sd");
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* exit_sd - exit point for this driver (when it is a module).
|
|
*
|
|
* Note: this function unregisters this driver from the scsi mid-level.
|
|
**/
|
|
static void __exit exit_sd(void)
|
|
{
|
|
int i;
|
|
|
|
SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
|
|
|
|
mempool_destroy(sd_cdb_pool);
|
|
kmem_cache_destroy(sd_cdb_cache);
|
|
|
|
scsi_unregister_driver(&sd_template.gendrv);
|
|
class_unregister(&sd_disk_class);
|
|
|
|
for (i = 0; i < SD_MAJORS; i++)
|
|
unregister_blkdev(sd_major(i), "sd");
|
|
}
|
|
|
|
module_init(init_sd);
|
|
module_exit(exit_sd);
|
|
|
|
static void sd_print_sense_hdr(struct scsi_disk *sdkp,
|
|
struct scsi_sense_hdr *sshdr)
|
|
{
|
|
sd_printk(KERN_INFO, sdkp, "");
|
|
scsi_show_sense_hdr(sshdr);
|
|
sd_printk(KERN_INFO, sdkp, "");
|
|
scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
|
|
}
|
|
|
|
static void sd_print_result(struct scsi_disk *sdkp, int result)
|
|
{
|
|
sd_printk(KERN_INFO, sdkp, "");
|
|
scsi_show_result(result);
|
|
}
|
|
|