diff options
| author | Daniil Lunev <dlunev@chromium.org> | 2022-08-29 08:18:58 +1000 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-09-06 22:18:06 -0400 |
| commit | 2286ade07d74498a62c0ad067a79ca8dcc04016f (patch) | |
| tree | c73bf76b57dfab8e4dd46b7e1f02733e7743ac20 /drivers/ufs | |
| parent | 9806d1b895f42c919620539b8e7621d73ea6d60d (diff) | |
scsi: ufs: core: Print UFSHCD capabilities in controller's sysfs node
Userspace may want to manually control when the data should go into
WriteBooster buffer. The control happens via "wb_on" node, but presently,
there is no simple way to check if WriteBooster is supported and
enabled.
Expose the Write Booster and Clock Scaling capabilities to be able to
determine if the Write Booster is available and if its manual control is
blocked by Clock Scaling mechanism.
Link: https://lore.kernel.org/r/20220829081845.v8.1.Ibf9efc9be50783eeee55befa2270b7d38552354c@changeid
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Daniil Lunev <dlunev@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/ufs')
| -rw-r--r-- | drivers/ufs/core/ufs-sysfs.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c index 600abcc535e3..53aea56d1de1 100644 --- a/drivers/ufs/core/ufs-sysfs.c +++ b/drivers/ufs/core/ufs-sysfs.c @@ -325,6 +325,40 @@ static const struct attribute_group ufs_sysfs_default_group = { .attrs = ufs_sysfs_ufshcd_attrs, }; +static ssize_t clock_scaling_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%d\n", ufshcd_is_clkscaling_supported(hba)); +} + +static ssize_t write_booster_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%d\n", ufshcd_is_wb_allowed(hba)); +} + +static DEVICE_ATTR_RO(clock_scaling); +static DEVICE_ATTR_RO(write_booster); + +/* + * See Documentation/ABI/testing/sysfs-driver-ufs for the semantics of this + * group. + */ +static struct attribute *ufs_sysfs_capabilities_attrs[] = { + &dev_attr_clock_scaling.attr, + &dev_attr_write_booster.attr, + NULL +}; + +static const struct attribute_group ufs_sysfs_capabilities_group = { + .name = "capabilities", + .attrs = ufs_sysfs_capabilities_attrs, +}; + static ssize_t monitor_enable_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1180,6 +1214,7 @@ static const struct attribute_group ufs_sysfs_attributes_group = { static const struct attribute_group *ufs_sysfs_groups[] = { &ufs_sysfs_default_group, + &ufs_sysfs_capabilities_group, &ufs_sysfs_monitor_group, &ufs_sysfs_device_descriptor_group, &ufs_sysfs_interconnect_descriptor_group, |