drm/amdgpu: Add FRU sysfs nodes only if needed

Create sysfs nodes for FRU data only if FRU data is available. Move the
logic to FRU specific file.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Lijo Lazar

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -164,71 +164,6 @@ static DEVICE_ATTR(pcie_replay_count, 0444,
 
 static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev);
 
-/**
- * DOC: product_name
- *
- * The amdgpu driver provides a sysfs API for reporting the product name
- * for the device
- * The file product_name is used for this and returns the product name
- * as returned from the FRU.
- * NOTE: This is only available for certain server cards
- */
-
-static ssize_t amdgpu_device_get_product_name(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct amdgpu_device *adev = drm_to_adev(ddev);
-
-	return sysfs_emit(buf, "%s\n", adev->product_name);
-}
-
-static DEVICE_ATTR(product_name, 0444,
-		amdgpu_device_get_product_name, NULL);
-
-/**
- * DOC: product_number
- *
- * The amdgpu driver provides a sysfs API for reporting the part number
- * for the device
- * The file product_number is used for this and returns the part number
- * as returned from the FRU.
- * NOTE: This is only available for certain server cards
- */
-
-static ssize_t amdgpu_device_get_product_number(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct amdgpu_device *adev = drm_to_adev(ddev);
-
-	return sysfs_emit(buf, "%s\n", adev->product_number);
-}
-
-static DEVICE_ATTR(product_number, 0444,
-		amdgpu_device_get_product_number, NULL);
-
-/**
- * DOC: serial_number
- *
- * The amdgpu driver provides a sysfs API for reporting the serial number
- * for the device
- * The file serial_number is used for this and returns the serial number
- * as returned from the FRU.
- * NOTE: This is only available for certain server cards
- */
-
-static ssize_t amdgpu_device_get_serial_number(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct amdgpu_device *adev = drm_to_adev(ddev);
-
-	return sysfs_emit(buf, "%s\n", adev->serial);
-}
-
-static DEVICE_ATTR(serial_number, 0444,
-		amdgpu_device_get_serial_number, NULL);
 
 /**
  * amdgpu_device_supports_px - Is the device a dGPU with ATPX power control
@@ -3550,9 +3485,6 @@ static void amdgpu_device_check_iommu_direct_map(struct amdgpu_device *adev)
 }
 
 static const struct attribute *amdgpu_dev_attributes[] = {
-	&dev_attr_product_name.attr,
-	&dev_attr_product_number.attr,
-	&dev_attr_serial_number.attr,
 	&dev_attr_pcie_replay_count.attr,
 	NULL
 };
@@ -3967,6 +3899,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	if (r)
 		dev_err(adev->dev, "Could not create amdgpu device attr\n");
 
+	amdgpu_fru_sysfs_init(adev);
+
 	if (IS_ENABLED(CONFIG_PERF_EVENTS))
 		r = amdgpu_pmu_init(adev);
 	if (r)
@@ -4086,6 +4020,7 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
 	if (adev->ucode_sysfs_en)
 		amdgpu_ucode_sysfs_fini(adev);
 	sysfs_remove_files(&adev->dev->kobj, amdgpu_dev_attributes);
+	amdgpu_fru_sysfs_fini(adev);
 
 	/* disable ras feature must before hw fini */
 	amdgpu_ras_pre_fini(adev);

drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c

@@ -212,3 +212,92 @@ int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
 	kfree(pia);
 	return 0;
 }
+
+/**
+ * DOC: product_name
+ *
+ * The amdgpu driver provides a sysfs API for reporting the product name
+ * for the device
+ * The file product_name is used for this and returns the product name
+ * as returned from the FRU.
+ * NOTE: This is only available for certain server cards
+ */
+
+static ssize_t amdgpu_fru_product_name_show(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+
+	return sysfs_emit(buf, "%s\n", adev->product_name);
+}
+
+static DEVICE_ATTR(product_name, 0444, amdgpu_fru_product_name_show, NULL);
+
+/**
+ * DOC: product_number
+ *
+ * The amdgpu driver provides a sysfs API for reporting the part number
+ * for the device
+ * The file product_number is used for this and returns the part number
+ * as returned from the FRU.
+ * NOTE: This is only available for certain server cards
+ */
+
+static ssize_t amdgpu_fru_product_number_show(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+
+	return sysfs_emit(buf, "%s\n", adev->product_number);
+}
+
+static DEVICE_ATTR(product_number, 0444, amdgpu_fru_product_number_show, NULL);
+
+/**
+ * DOC: serial_number
+ *
+ * The amdgpu driver provides a sysfs API for reporting the serial number
+ * for the device
+ * The file serial_number is used for this and returns the serial number
+ * as returned from the FRU.
+ * NOTE: This is only available for certain server cards
+ */
+
+static ssize_t amdgpu_fru_serial_number_show(struct device *dev,
+					     struct device_attribute *attr,
+					     char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+
+	return sysfs_emit(buf, "%s\n", adev->serial);
+}
+
+static DEVICE_ATTR(serial_number, 0444, amdgpu_fru_serial_number_show, NULL);
+
+static const struct attribute *amdgpu_fru_attributes[] = {
+	&dev_attr_product_name.attr,
+	&dev_attr_product_number.attr,
+	&dev_attr_serial_number.attr,
+	NULL
+};
+
+int amdgpu_fru_sysfs_init(struct amdgpu_device *adev)
+{
+	if (!is_fru_eeprom_supported(adev, NULL))
+		return 0;
+
+	return sysfs_create_files(&adev->dev->kobj, amdgpu_fru_attributes);
+}
+
+void amdgpu_fru_sysfs_fini(struct amdgpu_device *adev)
+{
+	if (!is_fru_eeprom_supported(adev, NULL))
+		return;
+
+	sysfs_remove_files(&adev->dev->kobj, amdgpu_fru_attributes);
+}

drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.h

@@ -25,5 +25,7 @@
 #define __AMDGPU_FRU_EEPROM_H__
 
 int amdgpu_fru_get_product_info(struct amdgpu_device *adev);
+int amdgpu_fru_sysfs_init(struct amdgpu_device *adev);
+void amdgpu_fru_sysfs_fini(struct amdgpu_device *adev);
 
 #endif  // __AMDGPU_FRU_EEPROM_H__