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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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13
drivers/gpu/drm/amd/amdgpu/cik.c
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@@ -1804,6 +1804,18 @@ static bool cik_need_reset_on_init(struct amdgpu_device *adev)
return false;
}
static uint64_t cik_get_pcie_replay_count(struct amdgpu_device *adev)
{
uint64_t nak_r, nak_g;
/* Get the number of NAKs received and generated */
nak_r = RREG32_PCIE(ixPCIE_RX_NUM_NAK);
nak_g = RREG32_PCIE(ixPCIE_RX_NUM_NAK_GENERATED);
/* Add the total number of NAKs, i.e the number of replays */
return (nak_r + nak_g);
}
static const struct amdgpu_asic_funcs cik_asic_funcs =
{
.read_disabled_bios = &cik_read_disabled_bios,
@@ -1821,6 +1833,7 @@ static const struct amdgpu_asic_funcs cik_asic_funcs =
.init_doorbell_index = &legacy_doorbell_index_init,
.get_pcie_usage = &cik_get_pcie_usage,
.need_reset_on_init = &cik_need_reset_on_init,
.get_pcie_replay_count = &cik_get_pcie_replay_count,
};
static int cik_common_early_init(void *handle)