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platform/x86/amd: pmc: Add sysfs files for SMU 

The CPU/APU SMU FW version and program is currently discoverable by
turning on dynamic debugging or examining debugfs for the amdgpu
driver. To make this more discoverable, create a dedicated sysfs
file for it that userspace can parse without debugging enabled.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20220914141850.259-1-mario.limonciello@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Mario Limonciello 2022-09-14 09:18:50 -05:00 committed by Hans de Goede
parent 00b1829294
commit 7f1ea75d49
2 changed files with 52 additions and 0 deletions
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13
Documentation/ABI/testing/sysfs-amd-pmc Normal file
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@ -0,0 +1,13 @@
What: /sys/bus/platform/drivers/amd_pmc/*/smu_fw_version
Date: October 2022
Contact: Mario Limonciello <mario.limonciello@amd.com>
Description: Reading this file reports the version of the firmware loaded to
System Management Unit (SMU) contained in AMD CPUs and
APUs.
What: /sys/bus/platform/drivers/amd_pmc/*/smu_program
Date: October 2022
Contact: Mario Limonciello <mario.limonciello@amd.com>
Description: Reading this file reports the program corresponding to the SMU
firmware version. The program field is used to disambiguate two
APU/CPU models that can share the same firmware binary.

39
drivers/platform/x86/amd/pmc.c
View File

@ -457,6 +457,44 @@ static int amd_pmc_get_smu_version(struct amd_pmc_dev *dev)
return 0;
}
static ssize_t smu_fw_version_show(struct device *d, struct device_attribute *attr,
char *buf)
{
struct amd_pmc_dev *dev = dev_get_drvdata(d);
if (!dev->major) {
int rc = amd_pmc_get_smu_version(dev);
if (rc)
return rc;
}
return sysfs_emit(buf, "%u.%u.%u\n", dev->major, dev->minor, dev->rev);
}
static ssize_t smu_program_show(struct device *d, struct device_attribute *attr,
char *buf)
{
struct amd_pmc_dev *dev = dev_get_drvdata(d);
if (!dev->major) {
int rc = amd_pmc_get_smu_version(dev);
if (rc)
return rc;
}
return sysfs_emit(buf, "%u\n", dev->smu_program);
}
static DEVICE_ATTR_RO(smu_fw_version);
static DEVICE_ATTR_RO(smu_program);
static struct attribute *pmc_attrs[] = {
&dev_attr_smu_fw_version.attr,
&dev_attr_smu_program.attr,
NULL,
};
ATTRIBUTE_GROUPS(pmc);
static int amd_pmc_idlemask_show(struct seq_file *s, void *unused)
{
struct amd_pmc_dev *dev = s->private;
@ -943,6 +981,7 @@ static struct platform_driver amd_pmc_driver = {
.driver = {
.name = "amd_pmc",
.acpi_match_table = amd_pmc_acpi_ids,
.dev_groups = pmc_groups,
},
.probe = amd_pmc_probe,
.remove = amd_pmc_remove,