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@xxxxxxx>
---
v1->v2:
* Feedback from Barnabás Pőcze
- Fix documentation EOF missing newline
- Use ATTRIBUTE_GROUPS macro
- Add missing NULL at end of attr
Documentation/ABI/testing/sysfs-amd-pmc | 14 +++++++++
drivers/platform/x86/amd/pmc.c | 39 +++++++++++++++++++++++++
2 files changed, 53 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-amd-pmc
diff --git a/Documentation/ABI/testing/sysfs-amd-pmc b/Documentation/ABI/testing/sysfs-amd-pmc
new file mode 100644
index 000000000000..5d71c2298f5b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-amd-pmc
@@ -0,0 +1,14 @@
+What: /sys/bus/platform/drivers/amd_pmc/*/smu_fw_version
+Date: October 2022
+Contact: Mario Limonciello <mario.limonciello@xxxxxxx>
+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@xxxxxxx>
+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.
+
diff --git a/drivers/platform/x86/amd/pmc.c b/drivers/platform/x86/amd/pmc.c
index 700eb19e8450..6373c1bce649 100644
--- a/drivers/platform/x86/amd/pmc.c
+++ b/drivers/platform/x86/amd/pmc.c
@@ -455,6 +455,44 @@ 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;
@@ -935,6 +973,7 @@ 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,
--
2.34.1
