Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f120386d authored by Evan Quan's avatar Evan Quan Committed by Alex Deucher
Browse files

drm/amdgpu: add new sysfs interface for memory realtime utilization 



A new sysfs interface mem_busy_percent is added for telling
how busy the VRAM is(in percentage).

Signed-off-by: default avatarEvan Quan <evan.quan@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 767fb6b3

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

+40 −0
Original line number Diff line number Diff line
@@ -1311,6 +1311,32 @@ static ssize_t amdgpu_get_busy_percent(struct device *dev, 
	return snprintf(buf, PAGE_SIZE, "%d\n", value);

}



/**

 * DOC: mem_busy_percent

 *

 * The amdgpu driver provides a sysfs API for reading how busy the VRAM

 * is as a percentage.  The file mem_busy_percent is used for this.

 * The SMU firmware computes a percentage of load based on the

 * aggregate activity level in the IP cores.

 */

static ssize_t amdgpu_get_memory_busy_percent(struct device *dev,

		struct device_attribute *attr,

		char *buf)

{

	struct drm_device *ddev = dev_get_drvdata(dev);

	struct amdgpu_device *adev = ddev->dev_private;

	int r, value, size = sizeof(value);



	/* read the IP busy sensor */

	r = amdgpu_dpm_read_sensor(adev, AMDGPU_PP_SENSOR_MEM_LOAD,

				   (void *)&value, &size);



	if (r)

		return r;



	return snprintf(buf, PAGE_SIZE, "%d\n", value);

}



/**

 * DOC: pcie_bw

 *
@@ -1380,6 +1406,8 @@ static DEVICE_ATTR(pp_od_clk_voltage, S_IRUGO | S_IWUSR, 
		amdgpu_set_pp_od_clk_voltage);

static DEVICE_ATTR(gpu_busy_percent, S_IRUGO,

		amdgpu_get_busy_percent, NULL);

static DEVICE_ATTR(mem_busy_percent, S_IRUGO,

		amdgpu_get_memory_busy_percent, NULL);

static DEVICE_ATTR(pcie_bw, S_IRUGO, amdgpu_get_pcie_bw, NULL);

static DEVICE_ATTR(ppfeatures, S_IRUGO | S_IWUSR,

		amdgpu_get_ppfeature_status,
@@ -2762,6 +2790,16 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev) 
				"gpu_busy_level\n");

		return ret;

	}

	/* APU does not have its own dedicated memory */

	if (!(adev->flags & AMD_IS_APU)) {

		ret = device_create_file(adev->dev,

				&dev_attr_mem_busy_percent);

		if (ret) {

			DRM_ERROR("failed to create device file	"

					"mem_busy_percent\n");

			return ret;

		}

	}

	/* PCIe Perf counters won't work on APU nodes */

	if (!(adev->flags & AMD_IS_APU)) {

		ret = device_create_file(adev->dev, &dev_attr_pcie_bw);
@@ -2827,6 +2865,8 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev) 
		device_remove_file(adev->dev,

				&dev_attr_pp_od_clk_voltage);

	device_remove_file(adev->dev, &dev_attr_gpu_busy_percent);

	if (!(adev->flags & AMD_IS_APU))

		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->asic_type >= CHIP_VEGA10) &&