kernel.git/drivers/ata/libata.h, branch linux-4.0.y

Merge branch 'for-3.20/drivers' of git://git.kernel.dk/linux-block

2015-02-12T22:30:53Z

Pull block driver changes from Jens Axboe: "This contains: - The 4k/partition fixes for brd from Boaz/Matthew. - A few xen front/back block fixes from David Vrabel and Roger Pau Monne. - Floppy changes from Takashi, cleaning the device file creation. - Switching libata to use the new blk-mq tagging policy, removing code (and a suboptimal implementation) from libata. This will throw you a merge conflict, since a bug in the original libata tagging code was fixed since this code was branched. Trivial. From Shaohua. - Conversion of loop to blk-mq, from Ming Lei. - Cleanup of the io_schedule() handling in bsg from Peter Zijlstra. He claims it improves on unreadable code, which will cost him a beer. - Maintainer update or NDB, now handled by Markus Pargmann. - NVMe: - Optimization from me that avoids a kmalloc/kfree per IO for smaller (<= 8KB) IO. This cuts about 1% of high IOPS CPU overhead. - Removal of (now) dead RCU code, a relic from before NVMe was converted to blk-mq" * 'for-3.20/drivers' of git://git.kernel.dk/linux-block: xen-blkback: default to X86_32 ABI on x86 xen-blkfront: fix accounting of reqs when migrating xen-blkback,xen-blkfront: add myself as maintainer block: Simplify bsg complete all floppy: Avoid manual call of device_create_file() NVMe: avoid kmalloc/kfree for smaller IO MAINTAINERS: Update NBD maintainer libata: make sata_sil24 use fifo tag allocator libata: move sas ata tag allocation to libata-scsi.c libata: use blk taging NVMe: within nvme_free_queues(), delete RCU sychro/deferred free null_blk: suppress invalid partition info brd: Request from fdisk 4k alignment brd: Fix all partitions BUGs axonram: Fix bug in direct_access loop: add blk-mq.h include block: loop: don't handle REQ_FUA explicitly block: loop: introduce lo_discard() and lo_req_flush() block: loop: say goodby to bio block: loop: improve performance via blk-mq

libata: move sas ata tag allocation to libata-scsi.c

2015-01-25T00:09:47Z

Basically move the sas ata tag allocation to libata-scsi.c to make it clear these staffs are just for sas. Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe

libata: use blk taging

2015-01-23T21:19:04Z

libata uses its own tag management which is duplication and the implementation is poor. And if we switch to blk-mq, tag is build-in. It's time to switch to generic taging. The SAS driver has its own tag management, and looks we can't directly map the host controler tag to SATA tag. So I just bypassed the SAS case. I changed the code/variable name for the tag management of libata to make it self contained. Only sas will use it. Later if libsas implements its tag management, the tag management code in libata can be deleted easily. Cc: Jens Axboe Cc: Christoph Hellwig Signed-off-by: Shaohua Li Acked-by: Tejun Heo Signed-off-by: Jens Axboe

ata: libata-core: Remove unused function

2015-01-11T16:51:50Z

Remove the function ata_do_simple_cmd() that is not used anywhere. This was partially found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist Signed-off-by: Tejun Heo

scsi: use 64-bit LUNs

2014-07-17T20:07:37Z

The SCSI standard defines 64-bit values for LUNs, and large arrays employing large or hierarchical LUN numbers become more and more common. So update the linux SCSI stack to use 64-bit LUN numbers. Signed-off-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Reviewed-by: Ewan Milne Signed-off-by: Christoph Hellwig

ATA / ACPI: remove power dependent device handling

2013-10-17T13:38:53Z

Previously, we wanted SCSI devices corrsponding to ATA devices to be runtime resumed when the power resource for those ATA device was turned on by some other device, so we added the SCSI device to the dependent device list of the ATA device's ACPI node. However, this code has no effect after commit 41863fc (ACPI / power: Drop automaitc resume of power resource dependent devices) and the mechanism it was supposed to implement is regarded as a bad idea now, so drop it. [rjw: Changelog] Signed-off-by: Aaron Lu Signed-off-by: Rafael J. Wysocki

libata: acpi: Remove ata_dev_acpi_handle stub in libata.h

2013-08-27T18:07:12Z

The ata_dev_acpi_handle is defined in libata-acpi.c and the only external user is libata-zpodd.c, which is built when CONFIG_ATA_ACPI is set, so there is no need to make an empty stub function for ONFIG_ATA_ACPI case in libata.h. It also causes compile errors due to acpi_handle is not defined when !CONFIG_ACPI. This patch fixes this problem by removing the empty stub. Reported-by: Stephen Rothwell Signed-off-by: Aaron Lu Signed-off-by: Tejun Heo

ata: acpi: rework the ata acpi bind support

2013-08-23T16:09:23Z

Binding ACPI handle to SCSI device has several drawbacks, namely: 1 During ATA device initialization time, ACPI handle will be needed while SCSI devices are not created yet. So each time ACPI handle is needed, instead of retrieving the handle by ACPI_HANDLE macro, a namespace scan is performed to find the handle for the corresponding ATA device. This is inefficient, and also expose a restriction on calling path not holding any lock. 2 The binding to SCSI device tree makes code complex, while at the same time doesn't bring us any benefit. All ACPI handlings are still done in ATA module, not in SCSI. Rework the ATA ACPI binding code to bind ACPI handle to ATA transport devices(ATA port and ATA device). The binding needs to be done only once, since the ATA transport devices do not go away with hotplug. And due to this, the flush_work call in hotplug handler for ATA bay is no longer needed. Tested on an Intel test platform for binding and runtime power off for ODD(ZPODD) and hard disk; on an ASUS S400C for binding and normal boot and S3, where its SATA port node has _SDD and _GTF control methods when configured as an AHCI controller and its PATA device node has _GTF control method when configured as an IDE controller. SATA PMP binding and ATA hotplug is not tested. Signed-off-by: Aaron Lu Tested-by: Dirk Griesbach Signed-off-by: Tejun Heo

libata: acpi: remove dead code for ata_acpi_(un)bind

2013-07-25T14:49:13Z

Commit 7381fe737 "libata-acpi: remove redundent code for power resource handling" removed ata_acpi_(un)bind but left their prototypes in libata.h, so remove them. Signed-off-by: Aaron Lu Signed-off-by: Tejun Heo

libata-acpi: add back ACPI based hotplug functionality

2013-06-24T22:51:33Z

Commit 30dcf76acc69 "libata: migrate ACPI code over to new bindings" mistakenly dropped the code to register hotplug notificaion handler for ATA port/devices, causing regression for people using ATA bay, as kernel bug #59871 shows. Fix this by adding back the hotplug notification handler registration code. Since this code has to be run once and notification needs to be installed on every ATA port/devices handle no matter if there is actual device attached, we can't do this in binding time for ATA device ACPI handle, as the binding only occurs when a SCSI device is created, i.e. there is device attached. So introduce the ata_acpi_hotplug_init() function to loop scan all ATA ACPI handles and if it is available, install the notificaion handler for it during ATA init time. With the ATA ACPI handle binding to SCSI device tree, it is possible now that when the SCSI hotplug work removes the SCSI device, the ACPI unbind function will find that the corresponding ACPI device has already been deleted by dock driver, causing a scaring message like: [ 128.263966] scsi 4:0:0:0: Oops, 'acpi_handle' corrupt Fix this by waiting for SCSI hotplug task finish in our notificaion handler, so that the removal of ACPI device done in ACPI unbind function triggered by the removal of SCSI device is run earlier when ACPI device is still available. [rjw: Rebased] References: https://bugzilla.kernel.org/show_bug.cgi?id=59871 Reported-bisected-and-tested-by: Dirk Griesbach Signed-off-by: Aaron Lu Acked-by: Tejun Heo Cc: 3.6+ Signed-off-by: Rafael J. Wysocki