drm/amdgpu: add read amdgpu_gfxoff status in debugfs

 Add interface for SMU12 device, used by UMR.

v2: fix code style
Signed-off-by: NJinzhou.Su <Jinzhou.Su@amd.com>
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -1073,6 +1073,57 @@ static ssize_t amdgpu_debugfs_gfxoff_write(struct file *f, const char __user *bu
 }
 
 
+/**
+ * amdgpu_debugfs_regs_gfxoff_status - read gfxoff status
+ *
+ * @f: open file handle
+ * @buf: User buffer to store read data in
+ * @size: Number of bytes to read
+ * @pos:  Offset to seek to
+ */
+static ssize_t amdgpu_debugfs_gfxoff_read(struct file *f, char __user *buf,
+					 size_t size, loff_t *pos)
+{
+	struct amdgpu_device *adev = file_inode(f)->i_private;
+	ssize_t result = 0;
+	int r;
+
+	if (size & 0x3 || *pos & 0x3)
+		return -EINVAL;
+
+	r = pm_runtime_get_sync(adev->ddev->dev);
+	if (r < 0)
+		return r;
+
+	while (size) {
+		uint32_t value;
+
+		r = amdgpu_get_gfx_off_status(adev, &value);
+		if (r) {
+			pm_runtime_mark_last_busy(adev->ddev->dev);
+			pm_runtime_put_autosuspend(adev->ddev->dev);
+			return r;
+		}
+
+		r = put_user(value, (uint32_t *)buf);
+		if (r) {
+			pm_runtime_mark_last_busy(adev->ddev->dev);
+			pm_runtime_put_autosuspend(adev->ddev->dev);
+			return r;
+		}
+
+		result += 4;
+		buf += 4;
+		*pos += 4;
+		size -= 4;
+	}
+
+	pm_runtime_mark_last_busy(adev->ddev->dev);
+	pm_runtime_put_autosuspend(adev->ddev->dev);
+
+	return result;
+}
+
 static const struct file_operations amdgpu_debugfs_regs_fops = {
 	.owner = THIS_MODULE,
 	.read = amdgpu_debugfs_regs_read,
@@ -1123,7 +1174,9 @@ static const struct file_operations amdgpu_debugfs_gpr_fops = {
 
 static const struct file_operations amdgpu_debugfs_gfxoff_fops = {
 	.owner = THIS_MODULE,
+	.read = amdgpu_debugfs_gfxoff_read,
 	.write = amdgpu_debugfs_gfxoff_write,
+	.llseek = default_llseek
 };
 
 static const struct file_operations *debugfs_regs[] = {

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

@@ -578,6 +578,20 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
 	mutex_unlock(&adev->gfx.gfx_off_mutex);
 }
 
+int amdgpu_get_gfx_off_status(struct amdgpu_device *adev, uint32_t *value)
+{
+
+	int r = 0;
+
+	mutex_lock(&adev->gfx.gfx_off_mutex);
+
+	r = smu_get_status_gfxoff(adev, value);
+
+	mutex_unlock(&adev->gfx.gfx_off_mutex);
+
+	return r;
+}
+
 int amdgpu_gfx_ras_late_init(struct amdgpu_device *adev)
 {
 	int r;

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

@@ -378,6 +378,7 @@ void amdgpu_gfx_bit_to_me_queue(struct amdgpu_device *adev, int bit,
 bool amdgpu_gfx_is_me_queue_enabled(struct amdgpu_device *adev, int me,
 				    int pipe, int queue);
 void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable);
+int amdgpu_get_gfx_off_status(struct amdgpu_device *adev, uint32_t *value);
 int amdgpu_gfx_ras_late_init(struct amdgpu_device *adev);
 void amdgpu_gfx_ras_fini(struct amdgpu_device *adev);
 int amdgpu_gfx_process_ras_data_cb(struct amdgpu_device *adev,

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -239,6 +239,19 @@ int smu_get_smc_version(struct smu_context *smu, uint32_t *if_version, uint32_t
 	return ret;
 }
 
+int smu_get_status_gfxoff(struct amdgpu_device *adev, uint32_t *value)
+{
+	int ret = 0;
+	struct smu_context *smu = &adev->smu;
+
+	if (is_support_sw_smu(adev) && smu->ppt_funcs->get_gfx_off_status)
+		*value = smu_get_gfx_off_status(smu);
+	else
+		ret = -EINVAL;
+
+	return ret;
+}
+
 int smu_set_soft_freq_range(struct smu_context *smu,
 			    enum smu_clk_type clk_type,
 			    uint32_t min,

drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h

@@ -555,6 +555,7 @@ struct pptable_funcs {
 	int (*set_fan_speed_rpm)(struct smu_context *smu, uint32_t speed);
 	int (*set_xgmi_pstate)(struct smu_context *smu, uint32_t pstate);
 	int (*gfx_off_control)(struct smu_context *smu, bool enable);
+	uint32_t (*get_gfx_off_status)(struct smu_context *smu);
 	int (*register_irq_handler)(struct smu_context *smu);
 	int (*set_azalia_d3_pme)(struct smu_context *smu);
 	int (*get_max_sustainable_clocks_by_dc)(struct smu_context *smu, struct pp_smu_nv_clock_table *max_clocks);
@@ -755,4 +756,6 @@ int smu_get_uclk_dpm_states(struct smu_context *smu,
 int smu_get_dpm_clock_table(struct smu_context *smu,
 			    struct dpm_clocks *clock_table);
 
+int smu_get_status_gfxoff(struct amdgpu_device *adev, uint32_t *value);
+
 #endif

drivers/gpu/drm/amd/powerplay/renoir_ppt.c

@@ -1087,6 +1087,7 @@ static const struct pptable_funcs renoir_ppt_funcs = {
 	.send_smc_msg_with_param = smu_v12_0_send_msg_with_param,
 	.set_gfx_cgpg = smu_v12_0_set_gfx_cgpg,
 	.gfx_off_control = smu_v12_0_gfx_off_control,
+	.get_gfx_off_status = smu_v12_0_get_gfxoff_status,
 	.init_smc_tables = smu_v12_0_init_smc_tables,
 	.fini_smc_tables = smu_v12_0_fini_smc_tables,
 	.set_default_dpm_table = smu_v12_0_set_default_dpm_tables,

drivers/gpu/drm/amd/powerplay/smu_internal.h

@@ -44,6 +44,7 @@
 #define smu_set_tool_table_location(smu)				smu_ppt_funcs(set_tool_table_location, 0, smu)
 #define smu_notify_memory_pool_location(smu)				smu_ppt_funcs(notify_memory_pool_location, 0, smu)
 #define smu_gfx_off_control(smu, enable)				smu_ppt_funcs(gfx_off_control, 0, smu, enable)
+#define smu_get_gfx_off_status(smu)						smu_ppt_funcs(get_gfx_off_status, 0, smu)
 #define smu_set_last_dcef_min_deep_sleep_clk(smu)			smu_ppt_funcs(set_last_dcef_min_deep_sleep_clk, 0, smu)
 #define smu_system_features_control(smu, en)				smu_ppt_funcs(system_features_control, 0, smu, en)
 #define smu_init_max_sustainable_clocks(smu)				smu_ppt_funcs(init_max_sustainable_clocks, 0, smu)