Commit Graph

15 Commits

Author SHA1 Message Date
Damien Le Moal
4a109032e3 scsi: sd_zbc: Fix sd_zbc_read_zoned_characteristics()
The three values starting at byte 8 of the Zoned Block Device
Characteristics VPD page B6h are 32 bits values, not 64bits. So use
get_unaligned_be32() to retrieve the values and not get_unaligned_be64()

Fixes: 89d9475610 ("sd: Implement support for ZBC devices")
Cc: <stable@vger.kernel.org>

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-10-16 23:54:33 -04:00
Damien Le Moal
e8c77ec483 scsi: sd_zbc: Use well defined macros
Instead of open coding, use the min() macro to calculate a report zones
reply buffer length in sd_zbc_check_zone_size() and the round_up() macro
for calculating the number of zones in sd_zbc_setup().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-10-16 23:54:33 -04:00
Damien Le Moal
5eed92d173 scsi: sd_zbc: Rearrange code
Rearrange sd_zbc_setup() to include use_16_for_rw and use_10_for_rw
assignments and move the calculation of sdkp->zone_shift together with
the assignment of the verified zone_blocks value in
sd_zbc_check_zone_size().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-10-16 23:54:32 -04:00
Damien Le Moal
e98f42bcad scsi: sd_zbc: Fix comments and indentation
Fix comments style (use kernel-doc style) and content to clarify some
functions. Also fix some functions signature indentation and remove a
useless blank line in sd_zbc_read_zones().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-10-16 23:54:32 -04:00
Damien Le Moal
aa8a845662 scsi: sd_zbc: Move ZBC declarations to scsi_proto.h
Move standard macro definitions for the zone types and zone conditions
to scsi_proto.h together with the definitions related to the REPORT
ZONES command. While at it, define all values in the enums to be clear.

Also remove unnecessary includes in sd_zbc.c.

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-10-16 23:54:32 -04:00
Damien Le Moal
70e42fd02c scsi: sd_zbc: Write unlock zone from sd_uninit_cmnd()
Releasing a zone write lock only when the write commnand that acquired
the lock completes can cause deadlocks due to potential command
reordering if the lock owning request is requeued and not executed. This
problem exists only with the scsi-mq path as, unlike the legacy path,
requests are moved out of the dispatch queue before being prepared and
so before locking a zone for a write command.

Since sd_uninit_cmnd() is now always called when a request is requeued,
call sd_zbc_write_unlock_zone() from that function for write requests
that acquired a zone lock instead of from sd_done(). Acquisition of a zone
lock by a write command is indicated using the new command
flag SCMD_ZONE_WRITE_LOCK.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-08-16 20:01:31 -04:00
Linus Torvalds
8d5e72dfdf SCSI misc on 20170503
This update includes the usual round of major driver updates
 (hisi_sas, ufs, fnic, cxlflash, be2iscsi, ipr, stex).  There's also
 the usual amount of cosmetic and spelling stuff.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI updates from James Bottomley:
 "This update includes the usual round of major driver updates
  (hisi_sas, ufs, fnic, cxlflash, be2iscsi, ipr, stex). There's also the
  usual amount of cosmetic and spelling stuff"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (155 commits)
  scsi: qla4xxx: fix spelling mistake: "Tempalate" -> "Template"
  scsi: stex: make S6flag static
  scsi: mac_esp: fix to pass correct device identity to free_irq()
  scsi: aacraid: pci_alloc_consistent() failures on ARM64
  scsi: ufs: make ufshcd_get_lists_status() register operation obvious
  scsi: ufs: use MASK_EE_STATUS
  scsi: mac_esp: Replace bogus memory barrier with spinlock
  scsi: fcoe: make fcoe_e_d_tov and fcoe_r_a_tov static
  scsi: sd_zbc: Do not write lock zones for reset
  scsi: sd_zbc: Remove superfluous assignments
  scsi: sd: sd_zbc: Rename sd_zbc_setup_write_cmnd
  scsi: Improve scsi_get_sense_info_fld
  scsi: sd: Cleanup sd_done sense data handling
  scsi: sd: Improve sd_completed_bytes
  scsi: sd: Fix function descriptions
  scsi: mpt3sas: remove redundant wmb
  scsi: mpt: Move scsi_remove_host() out of mptscsih_remove_host()
  scsi: sg: reset 'res_in_use' after unlinking reserved array
  scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case
  scsi: fusion: fix spelling mistake: "Persistancy" -> "Persistency"
  ...
2017-05-04 12:19:44 -07:00
Damien Le Moal
868ed5a5b7 scsi: sd_zbc: Do not write lock zones for reset
Resetting a zone write pointer is equivalent to discarding sectors:
after a reset, the zone sectors will contain zeros (or the format
pattern). So there is no need for mutual exclusion between a zone reset
and write. Similarly to discard, make it the responsability of the user
to properly synchronize between reset and write (as is done now for
discard and write).

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-04-25 13:00:58 -04:00
Bart Van Assche
f70532406a scsi: sd_zbc: Remove superfluous assignments
A value is assigned to the variable 'capacity' in sd_zbc_read_zones()
but that value is never used. Hence remove the variable 'capacity'.

[Damien: There is no need to initialize to 0 the variable 'ret'
in sd_zbc_read_zones()]

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-04-25 13:00:57 -04:00
Damien Le Moal
a90dfdc2de scsi: sd: sd_zbc: Rename sd_zbc_setup_write_cmnd
Rename sd_zbc_setup_write_cmnd() to sd_zbc_write_lock_zone() to be clear
about what the function actually does. To be consistent, also rename
sd_zbc_cancel_write_cmnd() to sd_zbc_write_unlock_zone().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-04-25 13:00:57 -04:00
Christoph Hellwig
02d261034f sd: implement REQ_OP_WRITE_ZEROES
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-08 11:25:38 -06:00
Damien Le Moal
c6463c651d sd_zbc: Force use of READ16/WRITE16
Normally, sd_read_capacity sets sdp->use_16_for_rw to 1 based on the
disk capacity so that READ16/WRITE16 are used for large drives.
However, for a zoned disk with RC_BASIS set to 0, the capacity reported
through READ_CAPACITY may be very small, leading to use_16_for_rw not being
set and READ10/WRITE10 commands being used, even after the actual zoned disk
capacity is corrected in sd_zbc_read_zones. This causes LBA offset overflow for
accesses beyond 2TB.

As the ZBC standard makes it mandatory for ZBC drives to support
the READ16/WRITE16 commands anyway, make sure that use_16_for_rw is set.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
eviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-11-14 13:16:42 -07:00
Christoph Hellwig
e806402130 block: split out request-only flags into a new namespace
A lot of the REQ_* flags are only used on struct requests, and only of
use to the block layer and a few drivers that dig into struct request
internals.

This patch adds a new req_flags_t rq_flags field to struct request for
them, and thus dramatically shrinks the number of common requests.  It
also removes the unfortunate situation where we have to fit the fields
from the same enum into 32 bits for struct bio and 64 bits for
struct request.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-28 08:45:17 -06:00
Arnd Bergmann
5f2808ff15 sd: fix uninitialized variable access in error handling
If sd_zbc_report_zones fails, the check for 'zone_blocks == 0'
later in the function accesses uninitialized data:

drivers/scsi/sd_zbc.c: In function ‘sd_zbc_read_zones’:
drivers/scsi/sd_zbc.c:520:7: error: ‘zone_blocks’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

This sets it to zero, which has the desired effect of leaving
the sd_zbc_read_zones successfully with sdkp->zone_blocks = 0.

Fixes: 89d9475610 ("sd: Implement support for ZBC devices")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-24 20:52:23 -06:00
Hannes Reinecke
89d9475610 sd: Implement support for ZBC devices
Implement ZBC support functions to setup zoned disks, both
host-managed and host-aware models. Only zoned disks that satisfy
the following conditions are supported:
1) All zones are the same size, with the exception of an eventual
   last smaller runt zone.
2) For host-managed disks, reads are unrestricted (reads are not
   failed due to zone or write pointer alignement constraints).
Zoned disks that do not satisfy these 2 conditions are setup with
a capacity of 0 to prevent their use.

The function sd_zbc_read_zones, called from sd_revalidate_disk,
checks that the device satisfies the above two constraints. This
function may also change the disk capacity previously set by
sd_read_capacity for devices reporting only the capacity of
conventional zones at the beginning of the LBA range (i.e. devices
reporting rc_basis set to 0).

The capacity message output was moved out of sd_read_capacity into
a new function sd_print_capacity to include this eventual capacity
change by sd_zbc_read_zones. This new function also includes a call
to sd_zbc_print_zones to display the number of zones and zone size
of the device.

Signed-off-by: Hannes Reinecke <hare@suse.de>

[Damien: * Removed zone cache support
         * Removed mapping of discard to reset write pointer command
         * Modified sd_zbc_read_zones to include checks that the
           device satisfies the kernel constraints
         * Implemeted REPORT ZONES setup and post-processing based
           on code from Shaun Tancheff <shaun.tancheff@seagate.com>
         * Removed confusing use of 512B sector units in functions
           interface]
Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2016-10-18 19:49:11 -06:00