drm/i915: use DEVICE_ATTR_RO macro

Use DEVICE_ATTR_RO() helper instead of plain DEVICE_ATTR(),
which makes the code a bit shorter and easier to read.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210528100403.21548-1-yuehaibing@huawei.com

drivers/gpu/drm/i915/i915_pmu.c

@@ -836,15 +836,13 @@ static ssize_t i915_pmu_event_show(struct device *dev,
 	return sprintf(buf, "config=0x%lx\n", eattr->val);
 }
 
-static ssize_t
-i915_pmu_get_attr_cpumask(struct device *dev,
-			  struct device_attribute *attr,
-			  char *buf)
+static ssize_t cpumask_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
 {
 	return cpumap_print_to_pagebuf(true, buf, &i915_pmu_cpumask);
 }
 
-static DEVICE_ATTR(cpumask, 0444, i915_pmu_get_attr_cpumask, NULL);
+static DEVICE_ATTR_RO(cpumask);
 
 static struct attribute *i915_cpumask_attrs[] = {
 	&dev_attr_cpumask.attr,

drivers/gpu/drm/i915/i915_sysfs.c

@@ -58,8 +58,8 @@ static u32 calc_residency(struct drm_i915_private *dev_priv,
 	return DIV_ROUND_CLOSEST_ULL(res, 1000);
 }
 
-static ssize_t
-show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
+static ssize_t rc6_enable_show(struct device *kdev,
+			       struct device_attribute *attr, char *buf)
 {
 	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 	unsigned int mask;
@@ -75,43 +75,43 @@ show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
 	return sysfs_emit(buf, "%x\n", mask);
 }
 
-static ssize_t
-show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
+static ssize_t rc6_residency_ms_show(struct device *kdev,
+				     struct device_attribute *attr, char *buf)
 {
 	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 	u32 rc6_residency = calc_residency(dev_priv, GEN6_GT_GFX_RC6);
 	return sysfs_emit(buf, "%u\n", rc6_residency);
 }
 
-static ssize_t
-show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
+static ssize_t rc6p_residency_ms_show(struct device *kdev,
+				      struct device_attribute *attr, char *buf)
 {
 	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 	u32 rc6p_residency = calc_residency(dev_priv, GEN6_GT_GFX_RC6p);
 	return sysfs_emit(buf, "%u\n", rc6p_residency);
 }
 
-static ssize_t
-show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
+static ssize_t rc6pp_residency_ms_show(struct device *kdev,
+				       struct device_attribute *attr, char *buf)
 {
 	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 	u32 rc6pp_residency = calc_residency(dev_priv, GEN6_GT_GFX_RC6pp);
 	return sysfs_emit(buf, "%u\n", rc6pp_residency);
 }
 
-static ssize_t
-show_media_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
+static ssize_t media_rc6_residency_ms_show(struct device *kdev,
+					   struct device_attribute *attr, char *buf)
 {
 	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 	u32 rc6_residency = calc_residency(dev_priv, VLV_GT_MEDIA_RC6);
 	return sysfs_emit(buf, "%u\n", rc6_residency);
 }
 
-static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
-static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
-static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
-static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
-static DEVICE_ATTR(media_rc6_residency_ms, S_IRUGO, show_media_rc6_ms, NULL);
+static DEVICE_ATTR_RO(rc6_enable);
+static DEVICE_ATTR_RO(rc6_residency_ms);
+static DEVICE_ATTR_RO(rc6p_residency_ms);
+static DEVICE_ATTR_RO(rc6pp_residency_ms);
+static DEVICE_ATTR_RO(media_rc6_residency_ms);
 
 static struct attribute *rc6_attrs[] = {
 	&dev_attr_rc6_enable.attr,