linux.git/drivers/ata/libata.h, branch for-next

ata: libata: Improve CDL resource management

2024-09-07T01:16:56+00:00

The ncq_sense_buf buffer field of struct ata_port is allocated and used
only for devices that support the Command Duration Limits (CDL) feature.
However, the cdl buffer of struct ata_device, which is used to cache the
command duration limits log page for devices supporting CDL is always
allocated as part of struct ata_device, which is wasteful of memory for
devices that do not support this feature.

Clean this up by defining both buffers as part of the new ata_cdl
structure and allocating this structure only for devices that support
the CDL feature. This new structure is attached to struct ata_device
using the cdl pointer.

The functions ata_dev_init_cdl_resources() and
ata_dev_cleanup_cdl_resources() are defined to manage this new structure
allocation, initialization and freeing when a port is removed or a
device disabled. ata_dev_init_cdl_resources() is called from
ata_dev_config_cdl() only for devices that support CDL.
ata_dev_cleanup_cdl_resources() is called from ata_dev_free_resources()
to free the ata_cdl structure when a device is being disabled by EH.

Note that the name of the former cdl log buffer of struct ata_device is
changed to desc_log_buf to make it clearer that it is a buffer for the
limit descriptors log page.

This change reduces the size of struct ata_device, thus reducing memory
usage for ATA devices that do not support the CDL feature.

Signed-off-by: Damien Le Moal 
Reviewed-by: Niklas Cassel

ata: libata: Introduce ata_dev_free_resources

2024-09-07T01:16:55+00:00

Introduce the function ata_dev_free_resources() to free the resources
allocated to support a device features. For now, this function is
reduced to calling zpodd_exit() for devices that have this feature
enabled.

ata_dev_free_resources() is called from ata_eh_dev_disable() as this
function is always called for all devices attached to a port that is
being detached and for devices that are being disabled due to being
removed (detached) from the system or due to errors.

With this change, the call to zpodd_exit() done in ata_port_detach()
and ata_scsi_handle_link_detach() are removed as these functions
remove all devices attached to the link or port using libata EH, thus
resulting in ata_eh_dev_disable() being called and the zpodd_exit()
function being executed.

Signed-off-by: Damien Le Moal 
Reviewed-by: Niklas Cassel

ata: libata: Rename ata_eh_read_sense_success_ncq_log()

2024-09-07T01:16:55+00:00

The function ata_eh_read_sense_success_ncq_log() does more that just
reading the sense data for successful NCQ commands log page as it also
sets the sense data for all commands listed in the log page.

Rename this function to ata_eh_get_ncq_success_sense() to better
describe what the function does. Furthermore, since this function is
only called from ata_eh_get_success_sense() in libata-eh.c, there is no
need to export it and its declaration can be moved to
drivers/ata/libata.h.

To be consistent with this change, the function
ata_eh_read_sense_success_non_ncq() is also renamed to
ata_eh_get_non_ncq_success_sense().

Signed-off-by: Damien Le Moal 
Reviewed-by: Niklas Cassel 
Reviewed-by: Hannes Reinecke

ata: libata: Move sata_down_spd_limit() to libata-sata.c

2024-09-07T01:16:55+00:00

Move the definition of the function sata_down_spd_limit() to
libata-sata.c where it belongs, together with sata_set_spd().
The helper function ata_sstatus_online() is also changed to be an
inline function defined in drivers/ata/libata.h.

Signed-off-by: Damien Le Moal 
Reviewed-by: Niklas Cassel 
Reviewed-by: Hannes Reinecke

ata: libata: Add helper ata_eh_decide_disposition()

2024-08-29T01:06:11+00:00

Every time I see libata code calling scsi_check_sense(), I get confused
why the code path that is working fine for SCSI code, is not sufficient
for libata code.

The reason is that SCSI usually gets the sense data as part of the
completion, and will thus automatically call scsi_check_sense(), which
will set the SCSI ML byte (if any).

However, for libata queued commands, we always need to fetch the sense
data via SCSI EH, and thus do not get the luxury of having
scsi_check_sense() called automatically.

Add a new helper, ata_eh_decide_disposition(), that has a ata_eh_ prefix
to more clearly highlight that this is only needed for code called by EH,
while also having a similar name to scsi_decide_disposition(), such that
it is easier to compare the libata code with the equivalent SCSI code.

Also add a big kdoc comment explaining why this helper is called/needed in
the first place.

Signed-off-by: Niklas Cassel 
Signed-off-by: Damien Le Moal

ata: libata: Remove obsolete function declarations

2024-08-26T23:04:53+00:00

The function ata_schedule_scsi_eh() was removed with commit
f8bbfc247efb ("[PATCH] SCSI: make scsi_implement_eh() generic API for
SCSI transports"), and the function ata_sff_irq_clear() was removed
with commit 37f65b8bc262("libata-sff: ata_sff_irq_clear() is BMDMA
specific").

Remove the now useless declarations of these functions in
drivers/ata/libata.h and include/linux/libata.h.

Signed-off-by: Gaosheng Cui 
Signed-off-by: Damien Le Moal

ata,scsi: Remove wrapper ata_sas_port_alloc()

2024-07-04T09:52:32+00:00

The ata_sas_port_alloc() wrapper mainly exists in order to export the
internal libata function which it wraps. The secondary reason is that
it initializes some ata_port struct members.

However, ata_sas_port_alloc() is only used in a single location,
sas_ata_init(), which already performs some ata_port struct member
initialization, so it does not make sense to spread this initialization
out over two separate locations.

Thus, remove the wrapper and instead export the libata function directly,
and move the libsas specific ata_port initialization to sas_ata_init(),
which already does some ata_port initialization.

Reviewed-by: Hannes Reinecke 
Reviewed-by: John Garry 
Reviewed-by: Martin K. Petersen 
Link: https://lore.kernel.org/r/20240703184418.723066-19-cassel@kernel.org
Signed-off-by: Niklas Cassel

ata: libata: Assign print_id at port allocation time

2024-07-04T09:52:32+00:00

While the assignment of ap->print_id could have been moved to
ata_host_alloc(), let's simply move it to ata_port_alloc().

If you allocate a port, you want to give it a unique name that can be used
for printing.

By moving the ap->print_id assignment to ata_port_alloc(), means that we
can also remove the ap->print_id assignment from ata_sas_port_alloc().

This will allow a LLD to use the ata_port_*() print functions before
ata_host_register() has been called.

Reviewed-by: Damien Le Moal 
Reviewed-by: Hannes Reinecke 
Reviewed-by: Martin K. Petersen 
Link: https://lore.kernel.org/r/20240703184418.723066-17-cassel@kernel.org
Signed-off-by: Niklas Cassel

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2024-05-15T01:25:53+00:00

Pull SCSI updates from James Bottomley:
 "Updates to the usual drivers (ufs, lpfc, qla2xxx, mpi3mr, libsas).

  The major update (which causes a conflict with block, see below) is
  Christoph removing the queue limits and their associated block
  helpers.

  The remaining patches are assorted minor fixes and deprecated function
  updates plus a bit of constification"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (141 commits)
  scsi: mpi3mr: Sanitise num_phys
  scsi: lpfc: Copyright updates for 14.4.0.2 patches
  scsi: lpfc: Update lpfc version to 14.4.0.2
  scsi: lpfc: Add support for 32 byte CDBs
  scsi: lpfc: Change lpfc_hba hba_flag member into a bitmask
  scsi: lpfc: Introduce rrq_list_lock to protect active_rrq_list
  scsi: lpfc: Clear deferred RSCN processing flag when driver is unloading
  scsi: lpfc: Update logging of protection type for T10 DIF I/O
  scsi: lpfc: Change default logging level for unsolicited CT MIB commands
  scsi: target: Remove unused list 'device_list'
  scsi: iscsi: Remove unused list 'connlist_err'
  scsi: ufs: exynos: Add support for Tensor gs101 SoC
  scsi: ufs: exynos: Add some pa_dbg_ register offsets into drvdata
  scsi: ufs: exynos: Allow max frequencies up to 267Mhz
  scsi: ufs: exynos: Add EXYNOS_UFS_OPT_TIMER_TICK_SELECT option
  scsi: ufs: exynos: Add EXYNOS_UFS_OPT_UFSPR_SECURE option
  scsi: ufs: dt-bindings: exynos: Add gs101 compatible
  scsi: qla2xxx: Fix debugfs output for fw_resource_count
  scsi: qedf: Ensure the copied buf is NUL terminated
  scsi: bfa: Ensure the copied buf is NUL terminated
  ...

ata: libata-core: Remove ata_exec_internal_sg()

2024-04-13T00:05:17+00:00

ata_exec_internal() is the only caller of ata_exec_internal_sg() and
always calls this function with a single element scattergather list.
Remove ata_exec_internal_sg() and code it directly in
ata_exec_internal(), simplifying a little the sgl handling for the
command.

While at it, change the function signature to use the proper enum
dma_data_direction type for the dma_dir argument, cleanup comments
(capitalization and remove useless comments) and change the variable
auto_timeout type to a boolean.

No functional change.

Signed-off-by: Damien Le Moal 
Reviewed-by: John Garry 
Reviewed-by: Niklas Cassel