Commit Graph

28 Commits

Author SHA1 Message Date
Mike Snitzer b277da0a8a block: disable entropy contributions for nonrot devices
Clear QUEUE_FLAG_ADD_RANDOM in all block drivers that set
QUEUE_FLAG_NONROT.

Historically, all block devices have automatically made entropy
contributions.  But as previously stated in commit e2e1a148 ("block: add
sysfs knob for turning off disk entropy contributions"):
    - On SSD disks, the completion times aren't as random as they
      are for rotational drives. So it's questionable whether they
      should contribute to the random pool in the first place.
    - Calling add_disk_randomness() has a lot of overhead.

There are more reliable sources for randomness than non-rotational block
devices.  From a security perspective it is better to err on the side of
caution than to allow entropy contributions from unreliable "random"
sources.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-10-04 10:55:32 -06:00
Benoit Taine 9baa3c34ac PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use
We should prefer `struct pci_device_id` over `DEFINE_PCI_DEVICE_TABLE` to
meet kernel coding style guidelines.  This issue was reported by checkpatch.

A simplified version of the semantic patch that makes this change is as
follows (http://coccinelle.lip6.fr/):

// <smpl>

@@
identifier i;
declarer name DEFINE_PCI_DEVICE_TABLE;
initializer z;
@@

- DEFINE_PCI_DEVICE_TABLE(i)
+ const struct pci_device_id i[]
= z;

// </smpl>

[bhelgaas: add semantic patch]
Signed-off-by: Benoit Taine <benoit.taine@lip6.fr>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-08-12 12:15:14 -06:00
Joe Perches a5bbf6160c block: use pci_zalloc_consistent
Remove the now unnecessary memset too.

Signed-off-by: Joe Perches <joe@perches.com>
Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:28 -07:00
Jens Axboe 6178976500 Merge branch 'for-3.16/core' into for-3.16/drivers
mtip32xx uses blk_mq_alloc_reserved_request(), so pull in the
core changes so we have a properly merged end result.

Signed-off-by: Jens Axboe <axboe@fb.com>
2014-05-28 09:50:26 -06:00
Alexander Gordeev 01aad3f0de skd: Use pci_enable_msix_exact() instead of pci_enable_msix_range()
Function pci_enable_msix_exact() is a variation of
pci_enable_msix_range() that allows a device driver
to request a particular number of MSI-X interrupts,
rather than any number within a specified range.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-04-21 19:02:05 -06:00
Jens Axboe dc4a93078b sd/skd: stuff discard page in request->completion_data
Store the pointer to the page there, so we can always safely
reference it from end_io context where ->bio may have been
cleared.

Signed-off-by: Jens Axboe <axboe@fb.com>
2014-04-16 21:37:30 -06:00
Jens Axboe b4f42e2831 block: remove struct request buffer member
This was used in the olden days, back when onions were proper
yellow. Basically it mapped to the current buffer to be
transferred. With highmem being added more than a decade ago,
most drivers map pages out of a bio, and rq->buffer isn't
pointing at anything valid.

Convert old style drivers to just use bio_data().

For the discard payload use case, just reference the page
in the bio.

Signed-off-by: Jens Axboe <axboe@fb.com>
2014-04-15 14:03:02 -06:00
Alexander Gordeev a9df862564 skd: Use pci_enable_msix_range() instead of pci_enable_msix()
As result of deprecation of MSI-X/MSI enablement functions
pci_enable_msix() and pci_enable_msi_block() all drivers
using these two interfaces need to be updated to use the
new pci_enable_msi_range() and pci_enable_msix_range()
interfaces.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-02-21 15:45:26 -08:00
Alexander Gordeev 1bc5ce5df9 skd: Use unified access to skdev->msix_entries throughout the code
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-02-21 15:45:26 -08:00
Alexander Gordeev 46817769ed skd: Fix incomplete cleanup of MSI-X interrupt
When enabling MSI-X interrupts fails due to lack of memory
the call to pci_disable_msix() is missed and the device is
left with MSI-X interrupts enabled while the driver assumes
otherwise. This update fixes the described misbehaviour and
cleans up the code of skd_release_msix() function.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-02-21 15:45:26 -08:00
Alexander Gordeev c5e3035c88 skd: Fix out of array boundary access
When enabling MSI-X, interrupts are requested for SKD_MAX_MSIX_COUNT
entries in skdev->msix_entries array, while the number of actually
allocated entries is skdev->msix_count. This might lead to an out of
boundary access in case number of allocated entries is less than
SKD_MAX_MSIX_COUNT. This update fixes the described misbehaviour.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-02-21 15:45:26 -08:00
Rashika Kheria a26ba7fadd drivers: block: Mark the functions as static in skd_main.c
Mark functions skd_skmsg_state_to_str() and skd_skreq_state_to_str() as
static in skd_main.c because they are not used outside this file.

This eliminates the following warnings in skd_main.c:
drivers/block/skd_main.c:5272:13: warning: no previous prototype for ‘skd_skmsg_state_to_str’ [-Wmissing-prototypes]
drivers/block/skd_main.c:5284:13: warning: no previous prototype for ‘skd_skreq_state_to_str’ [-Wmissing-prototypes]

Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-12-19 08:06:49 -07:00
Bartlomiej Zolnierkiewicz 542d7b0015 skd: reorder construct/destruct code
Reorder placement of skd_construct(), skd_cons_sg_list(), skd_destruct()
and skd_free_sg_list() functions. Then remove no longer needed function
prototypes.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz fec23f6311 skd: cleanup skd_do_inq_page_da()
skdev->pdev and skdev->pdev->bus are always different than NULL in
skd_do_inq_page_da() so simplify the code accordingly.

Also cache skdev->pdev value in pdev variable while at it.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz ebedd16dab skd: remove redundant skdev->pdev assignment from skd_pci_probe()
skdev->pdev is set to pdev twice in skd_pci_probe(), first time
through skd_construct() call and the second time directly in
the function. Remove the second assignment as it is not needed.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz 4ca90b5332 skd: use <asm/unaligned.h>
Use <asm/unaligned.h> instead of <asm-generic/unaligned.h>.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz 43504631d0 skd: remove SCSI subsystem specific includes
This is not a SCSI host driver so remove SCSI subsystem specific
includes.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz b8df6647c2 skd: register block device only if some devices are present
Register block device in skd_pci_probe() instead of in skd_init() so it
is registered only if some devices are present (currently it is always
registered when the driver is loaded). Please note that this change
depends on the fact that register_blkdev(0, ...) never returns 0.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz fbed149ab3 skd: fix error messages in skd_init()
* change priority level from KERN_INFO to KERN_ERR
* add "skd: " prefix
* do minor CodingStyle fixes

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz 2b91c55222 skd: fix error paths in skd_init()
Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:30 -07:00
Bartlomiej Zolnierkiewicz a073ae953e skd: fix unregister_blkdev() placement
register_blkdev() is called before pci_register_driver() in skd_init()
so unregister_blkdev() should be called after pci_unregister_driver()
in skd_exit(). Fix it.

Cc: Akhil Bhansali <abhansali@stec-inc.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
Mike Snitzer 38d4a1bb99 skd: more removal of bio-based code
Remove skd_flush_cmd structure and skd_flush_slab.
Remove skd_end_request wrapper around skd_end_request_blk.
Remove skd_requeue_request, use blk_requeue_request directly.
Cleanup some comments (remove "bio" info) and whitespace.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
Jens Axboe 6a5ec65b9a skd: cleanup the skd_*() function block wrapping
Just call the block functions directly, don't wrap them
in skd helpers. With only one queueing model enabled, there's
no point in doing that.

Also kill the ->start_time and ->bio from the skd_request_context,
we don't use those anymore.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
Jens Axboe fcd37eb3c1 skd: rip out bio path
The skd driver has a selectable rq or bio based queueing model.
For 3.14, we want to turn this into a single blk-mq interface
instead. With the immutable biovecs being merged in 3.13, the
bio model would need patches to even work. So rip it out, with
a conversion pending for blk-mq in the next release.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
Wei Yongjun 1762b57fcb skd: fix error return code in skd_pci_probe()
Fix to return -ENOMEM in the skd construct error handling
case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
rchinthekindi 2e44b42718 skd: Replaced custom debug PRINTKs with pr_debug
Replaced DPRINTK() and VPRINTK() with pr_debug().

Signed-off-by: Ramprasad C <ramprasad.chinthekindi@hgst.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
Akhil Bhansali f721bb0dbd skd: Fix checkpatch ERRORS and removed unused functions
This patch fixes checkpatch.pl errors for assignment in if condition.
It also removes unused readq / readl function calls.

As Andrew had disabled the compilation of drivers for 32 bit,
I have modified format specifiers in few VPRINTKs to avoid warnings
during 64 bit compilation.

Signed-off-by: Akhil Bhansali <abhansali@stec-inc.com>
Reviewed-by: Ramprasad Chinthekindi <rchinthekindi@stec-inc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:29 -07:00
Akhil Bhansali e67f86b31a Add support for sTec's pci-e flash card Kronos
Signed-off-by: Akhil Bhansali <abhansali@stec-inc.com>
Signed-off-by: Ramprasad Chinthekindi <rchinthekindi@stec-inc.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>

Folded patch, contributions to clean up this driver from:

Jens Axboe
Dan Carpenter
Andrew Morton

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:28 -07:00