drm/amdgpu: optimize amdgpu device attribute code

unified amdgpu device attribute node functions:
1. add some helper functions to create amdgpu device attribute node.
2. create device node according to device attr flags on different VF mode.
3. rename some functions name to adapt a new interface.

v2:
1. remove ATTR_STATE_DEAD, ATTR_STATE_ALIVE enum.
2. rename callback function perform to attr_update.
3. modify some variable names

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -30,6 +30,52 @@ struct cg_flag_name
 	const char *name;
 };
 
+enum amdgpu_device_attr_flags {
+	ATTR_FLAG_BASIC = (1 << 0),
+	ATTR_FLAG_ONEVF = (1 << 16),
+};
+
+#define ATTR_FLAG_TYPE_MASK	(0x0000ffff)
+#define ATTR_FLAG_MODE_MASK	(0xffff0000)
+#define ATTR_FLAG_MASK_ALL	(0xffffffff)
+
+enum amdgpu_device_attr_states {
+	ATTR_STATE_UNSUPPORTED = 0,
+	ATTR_STATE_SUPPORTED,
+};
+
+struct amdgpu_device_attr {
+	struct device_attribute dev_attr;
+	enum amdgpu_device_attr_flags flags;
+	enum amdgpu_device_attr_states states;
+	int (*attr_update)(struct amdgpu_device *adev,
+			   struct amdgpu_device_attr* attr,
+			   uint32_t mask);
+};
+
+#define to_amdgpu_device_attr(_dev_attr) \
+	container_of(_dev_attr, struct amdgpu_device_attr, dev_attr)
+
+#define __AMDGPU_DEVICE_ATTR(_name, _mode, _show, _store, _flags, ...)	\
+	{ .dev_attr = __ATTR(_name, _mode, _show, _store),		\
+	  .flags = _flags,						\
+	  .states = ATTR_STATE_SUPPORTED,					\
+	  ##__VA_ARGS__, }
+
+#define AMDGPU_DEVICE_ATTR(_name, _mode, _flags, ...)			\
+	__AMDGPU_DEVICE_ATTR(_name, _mode,				\
+			     amdgpu_get_##_name, amdgpu_set_##_name,	\
+			     _flags, ##__VA_ARGS__)
+
+#define AMDGPU_DEVICE_ATTR_RW(_name, _flags, ...)			\
+	AMDGPU_DEVICE_ATTR(_name, S_IRUGO | S_IWUSR,			\
+			   _flags, ##__VA_ARGS__)
+
+#define AMDGPU_DEVICE_ATTR_RO(_name, _flags, ...)			\
+	__AMDGPU_DEVICE_ATTR(_name, S_IRUGO,				\
+			     amdgpu_get_##_name, NULL,			\
+			     _flags, ##__VA_ARGS__)
+
 void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev);
 int amdgpu_pm_sysfs_init(struct amdgpu_device *adev);
 int amdgpu_pm_virt_sysfs_init(struct amdgpu_device *adev);