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ata: libata: Add libata.force parameter max_sec

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Add a new libata.force parameter called max_sec.

The parameter can take an arbitrary value using the format:
libata.force=max_sec=<number of 512B sectors>

e.g. libata.force=max_sec=8191
or
libata.force=max_sec=2048

This will allow the user to set an arbitrary maximum command size
(dev->max_sectors) using libata.force.

We cannot remove the existing libata.force parameters "max_sec_128" and
"max_sec_1024", as these are a part of the exising user facing API.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
This commit is contained in:
Niklas Cassel 2025-12-02 13:21:35 +01:00 • committed by Damien Le Moal
parent 45c4c5a615
commit ad50d922f4
2 changed files with 6 additions and 0 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
View file

@ -3412,6 +3412,11 @@ Kernel parameters
* [no]logdir: Enable or disable access to the general
purpose log directory.
* max_sec=<sectors>: Set the transfer size limit, in
number of 512-byte sectors, to the value specified in
<sectors>. The value specified in <sectors> has to be
a non-zero positive integer.
* max_sec_128: Set transfer size limit to 128 sectors.
* max_sec_1024: Set or clear transfer size limit to

1
drivers/ata/libata-core.c
View file

@ -6569,6 +6569,7 @@ static const struct ata_force_param force_tbl[] __initconst = {
force_quirk_val(max_sec_128, ATA_QUIRK_MAX_SEC, 128),
force_quirk_val(max_sec_1024, ATA_QUIRK_MAX_SEC, 1024),
force_quirk_on(max_sec=, ATA_QUIRK_MAX_SEC),
force_quirk_on(max_sec_lba48, ATA_QUIRK_MAX_SEC_LBA48),
force_quirk_onoff(lpm, ATA_QUIRK_NOLPM),