The sysfs interface is created for programming and monitoring the
performance counters in various HW blocks of Mellanox BlueField-1,
BlueField-2 and BlueField-3.

Signed-off-by: Shravan Kumar Ramani <shravankr@nvidia.com>
Reviewed-by: David Thompson <davthompson@nvidia.com>
---
 .../ABI/testing/sysfs-platform-mellanox-pmc   | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-platform-mellanox-pmc

diff --git a/Documentation/ABI/testing/sysfs-platform-mellanox-pmc b/Documentation/ABI/testing/sysfs-platform-mellanox-pmc
new file mode 100644
index 000000000000..47094024dbeb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-mellanox-pmc
@@ -0,0 +1,49 @@
+HID           Driver         Description
+MLNXBFD0      mlxbf-pmc      Performance counters (BlueField-1)
+MLNXBFD1      mlxbf-pmc      Performance counters (BlueField-2)
+MLNXBFD2      mlxbf-pmc      Performance counters (BlueField-3)
+
+What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/event_list
+Date:		Dec 2020
+KernelVersion:	5.10
+Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
+Description:
+		List of events supported by the counters in the specific block.
+		It is used to extract the event number or ID associated with
+		each event.
+
+What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/event<N>
+Date:		Dec 2020
+KernelVersion:	5.10
+Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
+Description:
+		Event monitored by corresponding counter. This is used to
+		program or read back the event that should be or is currently
+		being monitored by counter<N>.
+
+What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/counter<N>
+Date:		Dec 2020
+KernelVersion:	5.10
+Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
+Description:
+		Counter value of the event being monitored. This is used to
+		read the counter value of the event which was programmed using
+		event<N>. This is also used to clear or reset the counter value.
+
+What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/enable
+Date:		Dec 2020
+KernelVersion:	5.10
+Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
+Description:
+		Start or stop counters. This is used to start the counters
+		for monitoring the programmed events and also to stop the
+		counters after the desired duration.
+
+What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/<reg>
+Date:		Dec 2020
+KernelVersion:	5.10
+Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
+Description:
+		Value of register. This is used to read or reset the registers
+		where various performance statistics are counted for each block.
+
-- 
2.30.1

On Mon, 20 May 2024, Shravan Kumar Ramani wrote:

> The sysfs interface is created for programming and monitoring the

This patch is not creating interface. I suggest you change the wording to:

"Document the sysfs interface for ...

> performance counters in various HW blocks of Mellanox BlueField-1,
> BlueField-2 and BlueField-3.
> 
> Signed-off-by: Shravan Kumar Ramani <shravankr@nvidia.com>
> Reviewed-by: David Thompson <davthompson@nvidia.com>
> ---
>  .../ABI/testing/sysfs-platform-mellanox-pmc   | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-platform-mellanox-pmc
> 
> diff --git a/Documentation/ABI/testing/sysfs-platform-mellanox-pmc b/Documentation/ABI/testing/sysfs-platform-mellanox-pmc
> new file mode 100644
> index 000000000000..47094024dbeb
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-platform-mellanox-pmc
> @@ -0,0 +1,49 @@
> +HID           Driver         Description
> +MLNXBFD0      mlxbf-pmc      Performance counters (BlueField-1)
> +MLNXBFD1      mlxbf-pmc      Performance counters (BlueField-2)
> +MLNXBFD2      mlxbf-pmc      Performance counters (BlueField-3)
> +
> +What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/event_list
> +Date:		Dec 2020
> +KernelVersion:	5.10
> +Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
> +Description:
> +		List of events supported by the counters in the specific block.
> +		It is used to extract the event number or ID associated with
> +		each event.
> +
> +What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/event<N>
> +Date:		Dec 2020
> +KernelVersion:	5.10
> +Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
> +Description:
> +		Event monitored by corresponding counter. This is used to
> +		program or read back the event that should be or is currently
> +		being monitored by counter<N>.
> +
> +What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/counter<N>
> +Date:		Dec 2020
> +KernelVersion:	5.10
> +Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
> +Description:
> +		Counter value of the event being monitored. This is used to
> +		read the counter value of the event which was programmed using
> +		event<N>. This is also used to clear or reset the counter value.

Please document how to clear/reset it in more concrete terms (I didn't 
check the code but my guess would one writes zero there to reset the 
counter?).

> +What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/enable
> +Date:		Dec 2020
> +KernelVersion:	5.10
> +Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
> +Description:
> +		Start or stop counters. This is used to start the counters
> +		for monitoring the programmed events and also to stop the
> +		counters after the desired duration.
> +
> +What:		/sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/<reg>
> +Date:		Dec 2020
> +KernelVersion:	5.10
> +Contact:	"Shravan Kumar Ramani <shravankr@nvidia.com>"
> +Description:
> +		Value of register. This is used to read or reset the registers
> +		where various performance statistics are counted for each block.

Ditto for the reset part.

-- 
 i.