diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c index 6896dec97fc7..b38c06f0196e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c @@ -990,6 +990,31 @@ static ssize_t amdgpu_get_busy_percent(struct device *dev, return snprintf(buf, PAGE_SIZE, "%d\n", value); } +/** + * DOC: pcie_bw + * + * The amdgpu driver provides a sysfs API for estimating how much data + * has been received and sent by the GPU in the last second through PCIe. + * The file pcie_bw is used for this. + * The Perf counters count the number of received and sent messages and return + * those values, as well as the maximum payload size of a PCIe packet (mps). + * Note that it is not possible to easily and quickly obtain the size of each + * packet transmitted, so we output the max payload size (mps) to allow for + * quick estimation of the PCIe bandwidth usage + */ +static ssize_t amdgpu_get_pcie_bw(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct drm_device *ddev = dev_get_drvdata(dev); + struct amdgpu_device *adev = ddev->dev_private; + uint64_t count0, count1; + + amdgpu_asic_get_pcie_usage(adev, &count0, &count1); + return snprintf(buf, PAGE_SIZE, "%llu %llu %i\n", + count0, count1, pcie_get_mps(adev->pdev)); +} + static DEVICE_ATTR(power_dpm_state, S_IRUGO | S_IWUSR, amdgpu_get_dpm_state, amdgpu_set_dpm_state); static DEVICE_ATTR(power_dpm_force_performance_level, S_IRUGO | S_IWUSR, amdgpu_get_dpm_forced_performance_level, @@ -1025,6 +1050,7 @@ 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(pcie_bw, S_IRUGO, amdgpu_get_pcie_bw, NULL); static ssize_t amdgpu_hwmon_show_temp(struct device *dev, struct device_attribute *attr, @@ -2108,6 +2134,14 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev) "gpu_busy_level\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); + if (ret) { + DRM_ERROR("failed to create device file pcie_bw\n"); + return ret; + } + } ret = amdgpu_debugfs_pm_init(adev); if (ret) { DRM_ERROR("Failed to register debugfs file for dpm!\n"); @@ -2147,6 +2181,8 @@ 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_pcie_bw); } void amdgpu_pm_compute_clocks(struct amdgpu_device *adev) |