linux-kernel - [PATCH v2 3/4] perf: arm_cspmu: nvidia: enable NVLINK-C2C port filtering

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Message-ID: <20241031142118.1865965-4-bwicaksono@nvidia.com>
Date: Thu, 31 Oct 2024 14:21:17 +0000
From: Besar Wicaksono <bwicaksono@...dia.com>
To: <suzuki.poulose@....com>, <robin.murphy@....com>,
	<catalin.marinas@....com>, <will@...nel.org>, <mark.rutland@....com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <treding@...dia.com>, <jonathanh@...dia.com>,
	<vsethi@...dia.com>, <rwiley@...dia.com>, <rknight@...dia.com>,
	<ywan@...dia.com>, Besar Wicaksono <bwicaksono@...dia.com>
Subject: [PATCH v2 3/4] perf: arm_cspmu: nvidia: enable NVLINK-C2C port filtering

Enable NVLINK-C2C port filtering to distinguish traffic from
different GPUs connected to NVLINK-C2C.

Signed-off-by: Besar Wicaksono <bwicaksono@...dia.com>
---
 Documentation/admin-guide/perf/nvidia-pmu.rst | 30 +++++++++++++++++++
 drivers/perf/arm_cspmu/nvidia_cspmu.c         |  5 ++--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/perf/nvidia-pmu.rst b/Documentation/admin-guide/perf/nvidia-pmu.rst
index 6e8ee0fcf471..4cfc806070d7 100644
--- a/Documentation/admin-guide/perf/nvidia-pmu.rst
+++ b/Documentation/admin-guide/perf/nvidia-pmu.rst
@@ -86,6 +86,21 @@ Example usage:
 
    perf stat -a -e nvidia_nvlink_c2c0_pmu_3/event=0x0/
 
+The NVLink-C2C has two ports that can be connected to one GPU (occupying both
+ports) or to two GPUs (one GPU per port). The user can use "port" bitmap
+parameter to select the port(s) to monitor. Each bit represents the port number,
+e.g. "port=0x1" corresponds to port 0 and "port=0x3" is for port 0 and 1.
+
+Example for port filtering:
+
+* Count event id 0x0 from the GPU connected with socket 0 on port 0::
+
+   perf stat -a -e nvidia_nvlink_c2c0_pmu_0/event=0x0,port=0x1/
+
+* Count event id 0x0 from the GPUs connected with socket 0 on port 0 and port 1::
+
+   perf stat -a -e nvidia_nvlink_c2c0_pmu_0/event=0x0,port=0x3/
+
 NVLink-C2C1 PMU
 -------------------
 
@@ -116,6 +131,21 @@ Example usage:
 
    perf stat -a -e nvidia_nvlink_c2c1_pmu_3/event=0x0/
 
+The NVLink-C2C has two ports that can be connected to one GPU (occupying both
+ports) or to two GPUs (one GPU per port). The user can use "port" bitmap
+parameter to select the port(s) to monitor. Each bit represents the port number,
+e.g. "port=0x1" corresponds to port 0 and "port=0x3" is for port 0 and 1.
+
+Example for port filtering:
+
+* Count event id 0x0 from the GPU connected with socket 0 on port 0::
+
+   perf stat -a -e nvidia_nvlink_c2c1_pmu_0/event=0x0,port=0x1/
+
+* Count event id 0x0 from the GPUs connected with socket 0 on port 0 and port 1::
+
+   perf stat -a -e nvidia_nvlink_c2c1_pmu_0/event=0x0,port=0x3/
+
 CNVLink PMU
 ---------------
 
diff --git a/drivers/perf/arm_cspmu/nvidia_cspmu.c b/drivers/perf/arm_cspmu/nvidia_cspmu.c
index ea2d44adfa7c..7ab7d76e4ca1 100644
--- a/drivers/perf/arm_cspmu/nvidia_cspmu.c
+++ b/drivers/perf/arm_cspmu/nvidia_cspmu.c
@@ -130,6 +130,7 @@ static struct attribute *pcie_pmu_format_attrs[] = {
 
 static struct attribute *nvlink_c2c_pmu_format_attrs[] = {
 	ARM_CSPMU_FORMAT_EVENT_ATTR,
+	ARM_CSPMU_FORMAT_ATTR(port, "config1:0-1"),
 	NULL,
 };
 
@@ -210,7 +211,7 @@ static const struct nv_cspmu_match nv_cspmu_match[] = {
 	{
 	  .prodid = 0x104,
 	  .prodid_mask = NV_PRODID_MASK,
-	  .filter_mask = 0x0,
+	  .filter_mask = NV_NVL_C2C_FILTER_ID_MASK,
 	  .filter_default_val = NV_NVL_C2C_FILTER_ID_MASK,
 	  .name_pattern = "nvidia_nvlink_c2c1_pmu_%u",
 	  .name_fmt = NAME_FMT_SOCKET,
@@ -220,7 +221,7 @@ static const struct nv_cspmu_match nv_cspmu_match[] = {
 	{
 	  .prodid = 0x105,
 	  .prodid_mask = NV_PRODID_MASK,
-	  .filter_mask = 0x0,
+	  .filter_mask = NV_NVL_C2C_FILTER_ID_MASK,
 	  .filter_default_val = NV_NVL_C2C_FILTER_ID_MASK,
 	  .name_pattern = "nvidia_nvlink_c2c0_pmu_%u",
 	  .name_fmt = NAME_FMT_SOCKET,
-- 
2.34.1