Re: [PATCH 3/6] perf jevents: Add support for NVIDIA Tegra410 PCIE PMU aliasing
From: Chun-Tse Shao
Date: Mon Oct 19 2026 - 15:26:07 EST
Hi Besar,
Thanks for the series. I tested this on a 2-socket Tegra410. With
--metric-only, each PCIe metric shows up once per socket, with `nan`
("none" with -j) in the other socket's column, so -j has the same key
twice in each row. "counters" is also 0 for socket 1, because it comes
from the first event, which belongs to socket 0:
```
$ perf stat -a --per-socket -M pcie_avg_wr_bandwidth_to_all_dst -j
--metric-only -- sleep 1
{"socket" : "S268435456", "counters" : 6, "MB/s
pcie_avg_wr_bandwidth_to_all_dst" : "0.1", "MB/s
pcie_avg_wr_bandwidth_to_all_dst" : "none"}
{"socket" : "S285212672", "counters" : 0, "MB/s
pcie_avg_wr_bandwidth_to_all_dst" : "none", "MB/s
pcie_avg_wr_bandwidth_to_all_dst" : "0.9"}
```
As in [1], a single PMU per RC with cpumask `0,88`, or the socket last
in the PMU name, would fix this.
[1] https://lore.kernel.org/linux-perf-users/CAJpZYjWLRiyNbzoGpA-2KE0zHgQn2gc0V943WxJEr5K5aZtRYA@xxxxxxxxxxxxxx/
Thanks,
CT
On Mon, Oct 19, 2026 at 9:45 AM Besar Wicaksono <bwicaksono@xxxxxxxxxx> wrote:
>
> Add alias support for NVIDIA Tegra410 PCIE PMU events and metrics.
>
> Signed-off-by: Besar Wicaksono <bwicaksono@xxxxxxxxxx>
> ---
> .../arm64/nvidia/t410/sys/uncore-pcie.json | 247 ++++++++++++++++++
> 1 file changed, 247 insertions(+)
> create mode 100644 tools/perf/pmu-events/arch/arm64/nvidia/t410/sys/uncore-pcie.json
>
> diff --git a/tools/perf/pmu-events/arch/arm64/nvidia/t410/sys/uncore-pcie.json b/tools/perf/pmu-events/arch/arm64/nvidia/t410/sys/uncore-pcie.json
> new file mode 100644
> index 000000000000..37c3eac305e5
> --- /dev/null
> +++ b/tools/perf/pmu-events/arch/arm64/nvidia/t410/sys/uncore-pcie.json
> @@ -0,0 +1,247 @@
> +[
> + {
> + "EventCode": "0x100000000",
> + "EventName": "PCIE_CYCLES",
> + "BriefDescription": "Counts cycles at the PCIe interface to the Tegra SoC data fabric.",
> + "PublicDescription": "Counts cycles at the PCIe interface to the Tegra SoC data fabric.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "EventCode": "0x2",
> + "EventName": "PCIE_RD_REQ",
> + "BriefDescription": "Counts read requests from PCIe devices under this PCIe root complex to memory or another PCIe device.",
> + "PublicDescription": "Counts read requests from PCIe devices under this PCIe root complex to memory or another PCIe device, where the target responds with data. Request size can be from 1 to 256 bytes. Filters: src_rp_mask selects the requesting root ports. Alternatively, src_bdf with src_bdf_en selects one requesting device (BDF); it cannot be combined with src_rp_mask and applies to all counters of this PMU. Destination filters select the memory type of the request address: dst_loc_cmem local CMEM, dst_loc_gmem local GMEM, dst_loc_pcie_p2p local PCIe peer addresses, dst_loc_pcie_cxl local CXL memory, dst_rem remote memory. This is the address's home type, not where the data currently resides; local or remote is determined by the home socket of the address. An unset source filter counts all root ports; an unset destination filter counts all destinations.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "EventCode": "0x3",
> + "EventName": "PCIE_WR_REQ",
> + "BriefDescription": "Counts write requests from PCIe devices under this PCIe root complex to memory or another PCIe device.",
> + "PublicDescription": "Counts write requests from PCIe devices under this PCIe root complex to memory or another PCIe device, where the PCIe device sends data. Request size can be from 1 to 256 bytes. Filters: src_rp_mask selects the requesting root ports. Alternatively, src_bdf with src_bdf_en selects one requesting device (BDF); it cannot be combined with src_rp_mask and applies to all counters of this PMU. Destination filters select the memory type of the request address: dst_loc_cmem local CMEM, dst_loc_gmem local GMEM, dst_loc_pcie_p2p local PCIe peer addresses, dst_loc_pcie_cxl local CXL memory, dst_rem remote memory. This is the address's home type, not where the data currently resides; local or remote is determined by the home socket of the address. An unset source filter counts all root ports; an unset destination filter counts all destinations.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "EventCode": "0x0",
> + "EventName": "PCIE_RD_BYTES",
> + "BriefDescription": "Counts bytes transferred by the read requests counted by PCIE_RD_REQ.",
> + "PublicDescription": "Counts bytes transferred by the read requests counted by PCIE_RD_REQ. Source and destination filters work as described for PCIE_RD_REQ.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "EventCode": "0x1",
> + "EventName": "PCIE_WR_BYTES",
> + "BriefDescription": "Counts bytes transferred by the write requests counted by PCIE_WR_REQ.",
> + "PublicDescription": "Counts bytes transferred by the write requests counted by PCIE_WR_REQ. Source and destination filters work as described for PCIE_WR_REQ.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "EventCode": "0x4",
> + "EventName": "PCIE_RD_CUM_OUTS",
> + "BriefDescription": "Accumulates the outstanding read requests counted by PCIE_RD_REQ each cycle at the PCIe interface.",
> + "PublicDescription": "Accumulates the outstanding read requests counted by PCIE_RD_REQ each cycle at the PCIe interface. Pair the two under the same filters for the average read latency. Source and destination filters work as described for PCIE_RD_REQ.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_freq",
> + "MetricGroup": "PCIE_Frequency;PCIE_Read_Latency",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_CYCLES / aggr_nr(PCIE_CYCLES)) / 1e9 / duration_time",
> + "ScaleUnit": "1GHz",
> + "BriefDescription": "Frequency of the cycles at the PCIe interface to the Tegra SoC data fabric.",
> + "PublicDescription": "Average frequency of the cycles at the PCIe interface to the Tegra SoC data fabric over the measurement interval.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_bandwidth_to_all_dst",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_To_All_Destinations",
> + "MetricExpr": "PCIE_RD_BYTES@dst_loc_cmem=1,dst_loc_gmem=1,dst_loc_pcie_p2p=1,dst_loc_pcie_cxl=1,dst_rem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average read bandwidth from PCIe devices under this PCIe root complex to all destinations.",
> + "PublicDescription": "Average read bandwidth of requests from all PCIe devices under this PCIe root complex to all destinations: local CMEM, local GMEM, local PCIe peer addresses, local CXL memory and remote memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_wr_bandwidth_to_all_dst",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_To_All_Destinations",
> + "MetricExpr": "PCIE_WR_BYTES@dst_loc_cmem=1,dst_loc_gmem=1,dst_loc_pcie_p2p=1,dst_loc_pcie_cxl=1,dst_rem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average write bandwidth from PCIe devices under this PCIe root complex to all destinations.",
> + "PublicDescription": "Average write bandwidth of requests from all PCIe devices under this PCIe root complex to all destinations: local CMEM, local GMEM, local PCIe peer addresses, local CXL memory and remote memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_latency_to_all_dst",
> + "MetricGroup": "PCIE_Read_Latency;PCIE_To_All_Destinations",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_RD_CUM_OUTS@dst_loc_cmem=1,dst_loc_gmem=1,dst_loc_pcie_p2p=1,dst_loc_pcie_cxl=1,dst_rem=1@ / PCIE_RD_REQ@dst_loc_cmem=1,dst_loc_gmem=1,dst_loc_pcie_p2p=1,dst_loc_pcie_cxl=1,dst_rem=1@) / pcie_freq",
> + "ScaleUnit": "1ns/request",
> + "BriefDescription": "Average read latency from PCIe devices under this PCIe root complex to all destinations.",
> + "PublicDescription": "Average latency of read requests from all PCIe devices under this PCIe root complex to all destinations: local CMEM, local GMEM, local PCIe peer addresses, local CXL memory and remote memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_bandwidth_to_local_cmem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Read;PCIE_To_Local_CMEM",
> + "MetricExpr": "PCIE_RD_BYTES@dst_loc_cmem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average read bandwidth from PCIe devices under this PCIe root complex to local CMEM.",
> + "PublicDescription": "Average read bandwidth of requests from all PCIe devices under this PCIe root complex to local CMEM.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_wr_bandwidth_to_local_cmem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Write;PCIE_To_Local_CMEM",
> + "MetricExpr": "PCIE_WR_BYTES@dst_loc_cmem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average write bandwidth from PCIe devices under this PCIe root complex to local CMEM.",
> + "PublicDescription": "Average write bandwidth of requests from all PCIe devices under this PCIe root complex to local CMEM.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_latency_to_local_cmem",
> + "MetricGroup": "PCIE_Read_Latency;PCIE_Read;PCIE_To_Local_CMEM",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_RD_CUM_OUTS@dst_loc_cmem=1@ / PCIE_RD_REQ@dst_loc_cmem=1@) / pcie_freq",
> + "ScaleUnit": "1ns/request",
> + "BriefDescription": "Average read latency from PCIe devices under this PCIe root complex to local CMEM.",
> + "PublicDescription": "Average latency of read requests from all PCIe devices under this PCIe root complex to local CMEM.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_bandwidth_to_local_gmem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Read;PCIE_To_Local_GMEM",
> + "MetricExpr": "PCIE_RD_BYTES@dst_loc_gmem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average read bandwidth from PCIe devices under this PCIe root complex to local GMEM.",
> + "PublicDescription": "Average read bandwidth of requests from all PCIe devices under this PCIe root complex to local GMEM.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_wr_bandwidth_to_local_gmem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Write;PCIE_To_Local_GMEM",
> + "MetricExpr": "PCIE_WR_BYTES@dst_loc_gmem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average write bandwidth from PCIe devices under this PCIe root complex to local GMEM.",
> + "PublicDescription": "Average write bandwidth of requests from all PCIe devices under this PCIe root complex to local GMEM.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_latency_to_local_gmem",
> + "MetricGroup": "PCIE_Read_Latency;PCIE_Read;PCIE_To_Local_GMEM",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_RD_CUM_OUTS@dst_loc_gmem=1@ / PCIE_RD_REQ@dst_loc_gmem=1@) / pcie_freq",
> + "ScaleUnit": "1ns/request",
> + "BriefDescription": "Average read latency from PCIe devices under this PCIe root complex to local GMEM.",
> + "PublicDescription": "Average latency of read requests from all PCIe devices under this PCIe root complex to local GMEM.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_bandwidth_to_local_cxlmem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Read;PCIE_To_Local_CXLMEM",
> + "MetricExpr": "PCIE_RD_BYTES@dst_loc_pcie_cxl=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average read bandwidth from PCIe devices under this PCIe root complex to local CXL memory.",
> + "PublicDescription": "Average read bandwidth of requests from all PCIe devices under this PCIe root complex to local CXL memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_wr_bandwidth_to_local_cxlmem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Write;PCIE_To_Local_CXLMEM",
> + "MetricExpr": "PCIE_WR_BYTES@dst_loc_pcie_cxl=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average write bandwidth from PCIe devices under this PCIe root complex to local CXL memory.",
> + "PublicDescription": "Average write bandwidth of requests from all PCIe devices under this PCIe root complex to local CXL memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_latency_to_local_cxlmem",
> + "MetricGroup": "PCIE_Read_Latency;PCIE_Read;PCIE_To_Local_CXLMEM",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_RD_CUM_OUTS@dst_loc_pcie_cxl=1@ / PCIE_RD_REQ@dst_loc_pcie_cxl=1@) / pcie_freq",
> + "ScaleUnit": "1ns/request",
> + "BriefDescription": "Average read latency from PCIe devices under this PCIe root complex to local CXL memory.",
> + "PublicDescription": "Average latency of read requests from all PCIe devices under this PCIe root complex to local CXL memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_bandwidth_to_remote_mem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Read;PCIE_To_Remote_Memory",
> + "MetricExpr": "PCIE_RD_BYTES@dst_rem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average read bandwidth from PCIe devices under this PCIe root complex to remote memory.",
> + "PublicDescription": "Average read bandwidth of requests from all PCIe devices under this PCIe root complex to remote memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_wr_bandwidth_to_remote_mem",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Write;PCIE_To_Remote_Memory",
> + "MetricExpr": "PCIE_WR_BYTES@dst_rem=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average write bandwidth from PCIe devices under this PCIe root complex to remote memory.",
> + "PublicDescription": "Average write bandwidth of requests from all PCIe devices under this PCIe root complex to remote memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_latency_to_remote_mem",
> + "MetricGroup": "PCIE_Read_Latency;PCIE_Read;PCIE_To_Remote_Memory",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_RD_CUM_OUTS@dst_rem=1@ / PCIE_RD_REQ@dst_rem=1@) / pcie_freq",
> + "ScaleUnit": "1ns/request",
> + "BriefDescription": "Average read latency from PCIe devices under this PCIe root complex to remote memory.",
> + "PublicDescription": "Average latency of read requests from all PCIe devices under this PCIe root complex to remote memory.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_bandwidth_to_local_pcie_peer",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Read;PCIE_To_Local_PCIE_Peer",
> + "MetricExpr": "PCIE_RD_BYTES@dst_loc_pcie_p2p=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average read bandwidth from PCIe devices under this PCIe root complex to local PCIe peer addresses.",
> + "PublicDescription": "Average read bandwidth of requests from all PCIe devices under this PCIe root complex to local PCIe peer addresses.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_wr_bandwidth_to_local_pcie_peer",
> + "MetricGroup": "PCIE_Bandwidth;PCIE_Write;PCIE_To_Local_PCIE_Peer",
> + "MetricExpr": "PCIE_WR_BYTES@dst_loc_pcie_p2p=1@ / 1e6 / duration_time",
> + "ScaleUnit": "1MB/s",
> + "BriefDescription": "Average write bandwidth from PCIe devices under this PCIe root complex to local PCIe peer addresses.",
> + "PublicDescription": "Average write bandwidth of requests from all PCIe devices under this PCIe root complex to local PCIe peer addresses.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + },
> + {
> + "MetricName": "pcie_avg_rd_latency_to_local_pcie_peer",
> + "MetricGroup": "PCIE_Read_Latency;PCIE_Read;PCIE_To_Local_PCIE_Peer",
> + "MetricConstraint": "NO_GROUP_EVENTS",
> + "MetricExpr": "(PCIE_RD_CUM_OUTS@dst_loc_pcie_p2p=1@ / PCIE_RD_REQ@dst_loc_pcie_p2p=1@) / pcie_freq",
> + "ScaleUnit": "1ns/request",
> + "BriefDescription": "Average read latency from PCIe devices under this PCIe root complex to local PCIe peer addresses.",
> + "PublicDescription": "Average latency of read requests from all PCIe devices under this PCIe root complex to local PCIe peer addresses.",
> + "Compat": "1030136b",
> + "Unit": "nvidia_pcie_pmu_,rc_"
> + }
> +]
> --
> 2.43.0
>