drm/amdgpu: Add Unique Identifier sysfs file unique_id v2

Add a file that provides a Unique ID for the GPU.
This will persist across machines and is guaranteed to be unique.
This is only available for GFX9 and newer, so older ASICs will not
have this file in the sysfs pool

v2: Store it in adev for ASICs that don't have a hwmgr

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index adba9ea03e63..a73e1903d29b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -1368,6 +1368,29 @@ static ssize_t amdgpu_get_pcie_bw(struct device *dev,
                         count0, count1, pcie_get_mps(adev->pdev));
 }
 
+/**
+ * DOC: unique_id
+ *
+ * The amdgpu driver provides a sysfs API for providing a unique ID for the GPU
+ * The file unique_id is used for this.
+ * This will provide a Unique ID that will persist from machine to machine
+ *
+ * NOTE: This will only work for GFX9 and newer. This file will be absent
+ * on unsupported ASICs (GFX8 and older)
+ */
+static ssize_t amdgpu_get_unique_id(struct device *dev,
+                struct device_attribute *attr,
+                char *buf)
+{
+        struct drm_device *ddev = dev_get_drvdata(dev);
+        struct amdgpu_device *adev = ddev->dev_private;
+
+        if (adev->unique_id)
+                return snprintf(buf, PAGE_SIZE, "%016llx\n", adev->unique_id);
+
+        return 0;
+}
+
 static DEVICE_ATTR(power_dpm_state, S_IRUGO | S_IWUSR, amdgpu_get_dpm_state, amdgpu_set_dpm_state);
 static DEVICE_ATTR(power_dpm_force_performance_level, S_IRUGO | S_IWUSR,
                    amdgpu_get_dpm_forced_performance_level,
@@ -1418,6 +1441,7 @@ static DEVICE_ATTR(pcie_bw, S_IRUGO, amdgpu_get_pcie_bw, NULL);
 static DEVICE_ATTR(ppfeatures, S_IRUGO | S_IWUSR,
                 amdgpu_get_ppfeature_status,
                 amdgpu_set_ppfeature_status);
+static DEVICE_ATTR(unique_id, S_IRUGO, amdgpu_get_unique_id, NULL);
 
 static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
                                       struct device_attribute *attr,
@@ -2814,6 +2838,12 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
                         return ret;
                 }
         }
+        if (adev->unique_id)
+                ret = device_create_file(adev->dev, &dev_attr_unique_id);
+        if (ret) {
+                DRM_ERROR("failed to create device file unique_id\n");
+                return ret;
+        }
         ret = amdgpu_debugfs_pm_init(adev);
         if (ret) {
                 DRM_ERROR("Failed to register debugfs file for dpm!\n");
@@ -2875,6 +2905,8 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
                 device_remove_file(adev->dev, &dev_attr_mem_busy_percent);
         if (!(adev->flags & AMD_IS_APU))
                 device_remove_file(adev->dev, &dev_attr_pcie_bw);
+        if (adev->unique_id)
+                device_remove_file(adev->dev, &dev_attr_unique_id);
         if ((adev->asic_type >= CHIP_VEGA10) &&
             !(adev->flags & AMD_IS_APU))
                 device_remove_file(adev->dev, &dev_attr_ppfeatures);