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

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

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Evan Quan 2019-04-26 12:02:48 +08:00 committed by Alex Deucher
parent 767fb6b35d
commit f120386d74
1 changed files with 40 additions and 0 deletions
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40
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@ -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) &&