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drm/amdgpu: Add PCIe replay count sysfs file

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Add a sysfs file for reporting the number of PCIe replays (NAKs). This
returns the sum of NAKs received and NAKs generated

Signed-off-by: Kent Russell <kent.russell@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Kent Russell
2019-04-30 06:43:33 -04:00
committed by Alex Deucher
parent 673b366b41
commit dcea6e65d4
6 changed files with 85 additions and 0 deletions
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29
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -97,6 +97,28 @@ static const char *amdgpu_asic_name[] = {
"LAST",
};
/**
* DOC: pcie_replay_count
*
* The amdgpu driver provides a sysfs API for reporting the total number
* of PCIe replays (NAKs)
* The file pcie_replay_count is used for this and returns the total
* number of replays as a sum of the NAKs generated and NAKs received
*/
static ssize_t amdgpu_device_get_pcie_replay_count(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 cnt = amdgpu_asic_get_pcie_replay_count(adev);
return snprintf(buf, PAGE_SIZE, "%llu\n", cnt);
}
static DEVICE_ATTR(pcie_replay_count, S_IRUGO,
amdgpu_device_get_pcie_replay_count, NULL);
static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev);
/**
@@ -2721,6 +2743,12 @@ fence_driver_init:
/* must succeed. */
amdgpu_ras_post_init(adev);
r = device_create_file(adev->dev, &dev_attr_pcie_replay_count);
if (r) {
dev_err(adev->dev, "Could not create pcie_replay_count");
return r;
}
return 0;
failed:
@@ -2784,6 +2812,7 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
adev->rmmio = NULL;
amdgpu_device_doorbell_fini(adev);
amdgpu_debugfs_regs_cleanup(adev);
device_remove_file(adev->dev, &dev_attr_pcie_replay_count);
}