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authorKent Russell <kent.russell@amd.com>2019-04-30 13:43:33 +0300
committerAlex Deucher <alexander.deucher@amd.com>2019-05-24 20:20:48 +0300
commitdcea6e65d41f4696571d5d391d3a760cfbb8ee00 (patch)
tree156db83858b303fc6ee3a02dd1fbb398b48259c7 /drivers/gpu/drm/amd/amdgpu/si.c
parent673b366b41e216309c830d86d628e08736172067 (diff)
downloadlinux-dcea6e65d41f4696571d5d391d3a760cfbb8ee00.tar.xz
drm/amdgpu: Add PCIe replay count sysfs file
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/si.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/si.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
index 9d8df68893b9..4ff930a47e10 100644
--- a/drivers/gpu/drm/amd/amdgpu/si.c
+++ b/drivers/gpu/drm/amd/amdgpu/si.c
@@ -1375,6 +1375,18 @@ static void si_get_pcie_usage(struct amdgpu_device *adev, uint64_t *count0,
*count1 = RREG32_PCIE(ixPCIE_PERF_COUNT1_TXCLK) | (cnt1_of << 32);
}
+static uint64_t si_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 si_asic_funcs =
{
.read_disabled_bios = &si_read_disabled_bios,
@@ -1393,6 +1405,7 @@ static const struct amdgpu_asic_funcs si_asic_funcs =
.need_full_reset = &si_need_full_reset,
.get_pcie_usage = &si_get_pcie_usage,
.need_reset_on_init = &si_need_reset_on_init,
+ .get_pcie_replay_count = &si_get_pcie_replay_count,
};
static uint32_t si_get_rev_id(struct amdgpu_device *adev)