From: Damien Le Moal <email@example.com> To: Jens Axboe <firstname.lastname@example.org>, email@example.com, firstname.lastname@example.org, "Martin K . Petersen" <email@example.com>, firstname.lastname@example.org Subject: [PATCH v7 0/5] Initial support for multi-actuator HDDs Date: Mon, 6 Sep 2021 10:58:05 +0900 [thread overview] Message-ID: <email@example.com> (raw) Single LUN multi-actuator hard-disks are cappable to seek and execute multiple commands in parallel. This capability is exposed to the host using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA). Each positioning range describes the contiguous set of LBAs that an actuator serves. This series adds support to the scsi disk driver to retreive this information and advertize it to user space through sysfs. libata is also modified to handle ATA drives. The first patch adds the block layer plumbing to expose concurrent sector ranges of the device through sysfs as a sub-directory of the device sysfs queue directory. Patch 2 and 3 add support to sd and libata. Finally patch 4 documents the sysfs queue attributed changes. Patch 5 fixes a typo in the document file (strictly speaking, not related to this series). This series does not attempt in any way to optimize accesses to multi-actuator devices (e.g. block IO schedulers or filesystems). This initial support only exposes the independent access ranges information to user space through sysfs. Changes from v6: * Changed patch 1 to prevent a device from registering overlapping independent access ranges. Changes from v5: * Changed type names in patch 1: - struct blk_crange -> sturct blk_independent_access_range - struct blk_cranges -> sturct blk_independent_access_ranges All functions and variables are renamed accordingly, using shorter names related to the new type names, e.g. sturct blk_independent_access_ranges -> iaranges or iars. * Update the commit message of patch 1 to 4. Patch 1 and 4 titles are also changed. * Dropped reviewed-tags on modified patches. Patch 3 and 5 are unmodified Changes from v4: * Fixed kdoc comment function name mismatch for disk_register_cranges() in patch 1 Changes from v3: * Modified patch 1: - Prefix functions that take a struct gendisk as argument with "disk_". Modified patch 2 accordingly. - Added a functional release operation for struct blk_cranges kobj to ensure that this structure is freed only after all references to it are released, including kobject_del() execution for all crange sysfs entries. * Added patch 5 to separate the typo fix from the crange documentation addition. * Added reviewed-by tags Changes from v2: * Update patch 1 to fix a compilation warning for a potential NULL pointer dereference of the cr argument of blk_queue_set_cranges(). Warning reported by the kernel test robot <firstname.lastname@example.org>). Changes from v1: * Moved libata-scsi hunk from patch 1 to patch 3 where it belongs * Fixed unintialized variable in patch 2 Reported-by: kernel test robot <email@example.com> Reported-by: Dan Carpenter <firstname.lastname@example.org * Changed patch 3 adding struct ata_cpr_log to contain both the number of concurrent ranges and the array of concurrent ranges. * Added a note in the documentation (patch 4) about the unit used for the concurrent ranges attributes. Damien Le Moal (5): block: Add independent access ranges support scsi: sd: add concurrent positioning ranges support libata: support concurrent positioning ranges log doc: document sysfs queue/independent_access_ranges attributes doc: Fix typo in request queue sysfs documentation Documentation/block/queue-sysfs.rst | 33 ++- block/Makefile | 2 +- block/blk-iaranges.c | 345 ++++++++++++++++++++++++++++ block/blk-sysfs.c | 26 ++- block/blk.h | 4 + drivers/ata/libata-core.c | 57 ++++- drivers/ata/libata-scsi.c | 48 +++- drivers/scsi/sd.c | 81 +++++++ drivers/scsi/sd.h | 1 + include/linux/ata.h | 1 + include/linux/blkdev.h | 39 ++++ include/linux/libata.h | 15 ++ 12 files changed, 631 insertions(+), 21 deletions(-) create mode 100644 block/blk-iaranges.c -- 2.31.1
next reply other threads:[~2021-09-06 1:58 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-06 1:58 Damien Le Moal [this message] 2021-09-06 1:58 ` [PATCH v7 1/5] block: Add independent access ranges support Damien Le Moal 2021-09-06 8:14 ` Hannes Reinecke 2021-09-06 17:38 ` Jens Axboe 2021-09-06 22:31 ` Damien Le Moal 2021-09-06 1:58 ` [PATCH v7 2/5] scsi: sd: add concurrent positioning " Damien Le Moal 2021-09-06 8:35 ` Hannes Reinecke 2021-09-06 1:58 ` [PATCH v7 3/5] libata: support concurrent positioning ranges log Damien Le Moal 2021-09-06 1:58 ` [PATCH v7 4/5] doc: document sysfs queue/independent_access_ranges attributes Damien Le Moal 2021-09-06 8:37 ` Hannes Reinecke 2021-09-06 1:58 ` [PATCH v7 5/5] doc: Fix typo in request queue sysfs documentation Damien Le Moal 2021-09-06 8:37 ` Hannes Reinecke
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