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2023-05-22scsi: core: Allow enabling and disabling command duration limitsDamien Le Moal1-0/+13
Add the sysfs scsi_device attribute cdl_enable to allow a user to enable or disable a device command duration limits feature. CDL is disabled by default. This feature must be explicitly enabled by a user by setting the cdl_enable attribute to 1. The new function scsi_cdl_enable() does not do anything beside setting the cdl_enable field of struct scsi_device in the case of a (real) SCSI device (e.g. a SAS HDD). For ATA devices, the command duration limits feature needs to be enabled/disabled using the ATA feature sub-page of the control mode page. To do so, the scsi_cdl_enable() function checks if this mode page is supported using scsi_mode_sense(). If it is, scsi_mode_select() is used to enable and disable CDL. Signed-off-by: Damien Le Moal <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Co-developed-by: Niklas Cassel <[email protected]> Signed-off-by: Niklas Cassel <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Martin K. Petersen <[email protected]>
2023-05-22scsi: core: Detect support for command duration limitsDamien Le Moal1-0/+9
Introduce the function scsi_cdl_check() to detect if a device supports command duration limits (CDL). Support for the READ 16, WRITE 16, READ 32 and WRITE 32 commands are checked using the function scsi_report_opcode() to probe the rwcdlp and cdlp bits as they indicate the mode page defining the command duration limits descriptors that apply to the command being tested. If any of these commands support CDL, the field cdl_supported of struct scsi_device is set to 1 to indicate that the device supports CDL. Support for CDL for a device is advertizes through sysfs using the new cdl_supported device attribute. This attribute value is 1 for a device supporting CDL and 0 otherwise. Signed-off-by: Damien Le Moal <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Co-developed-by: Niklas Cassel <[email protected]> Signed-off-by: Niklas Cassel <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Martin K. Petersen <[email protected]>
2021-08-18docs: sysfs-block-device: document ncq_prio_supportedDamien Le Moal1-1/+24
Add documentation for the new device attribute file ncq_prio_supported, and its SAS HBA equivalent sas_ncq_prio_supported. Signed-off-by: Damien Le Moal <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2021-08-18docs: sysfs-block-device: improve ncq_prio_enable documentationNiklas Cassel1-3/+17
NCQ priority is an optional feature of the NCQ feature set and should not be confused with the NCQ feature set itself. Clarify the description of the ncq_prio_enable attribute to avoid this confusion. Also add the missing documentation for the equivalent sas_ncq_prio_enable attribute. Signed-off-by: Niklas Cassel <[email protected]> Signed-off-by: Damien Le Moal <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2020-10-30docs: ABI: testing: make the files compatible with ReST outputMauro Carvalho Chehab1-0/+2
Some files over there won't parse well by Sphinx. Fix them. Acked-by: Jonathan Cameron <[email protected]> # for IIO Acked-by: Fabrice Gasnier <[email protected]> Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/58cf3c2d611e0197fb215652719ebd82ca2658db.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2019-07-15docs: admin-guide: add laptops documentationMauro Carvalho Chehab1-1/+1
The docs under Documentation/laptops contain users specific information. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Acked-by: Andy Shevchenko <[email protected]>
2019-07-15docs: laptops: convert to ReSTMauro Carvalho Chehab1-1/+1
Rename the laptops documentation files to ReST, add an index for them and adjust in order to produce a nice html output via the Sphinx build system. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Acked-by: Andy Shevchenko <[email protected]>
2018-02-13libata: update documentation for sysfs interfacesAishwarya Pant1-0/+58
Dcoumentation has been added by parsing through git commit history and reading code. This might be useful for scripting and tracking changes in the ABI. I do not have complete descriptions for the following 3 attributes; they have been annotated with the comment [to be documented] - /sys/class/scsi_host/hostX/ahci_port_cmd /sys/class/scsi_host/hostX/ahci_host_caps /sys/class/scsi_host/hostX/ahci_host_cap2 Signed-off-by: Aishwarya Pant <[email protected]> Signed-off-by: Tejun Heo <[email protected]>
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