[v1,1/3] Documentation/ABI: Add document for Mellanox PMC driver

Commit Message

Shravan Ramani April 17, 2024, 7:30 a.m. UTC

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 <[e-mail]>
Reviewed-by: David Thompson <[e-mail]>
---
 .../ABI/testing/sysfs-platform-mellanox-pmc   | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-platform-mellanox-pmc

Comments

Ilpo Järvinen April 17, 2024, 1:13 p.m. UTC | #1

On Wed, 17 Apr 2024, Shravan Kumar Ramani wrote:

> 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 <[e-mail]>
> Reviewed-by: David Thompson <[e-mail]>
> ---

This documents the existing sysfs files? Which is good, thank you!

However, there's still no PATCH 4/ which would document the new interface 
added by this series, namely use_odd_counter and count_clock, am I 
correct?

Patch

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 <[e-mail]>"
+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 <[e-mail]>"
+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 <[e-mail]>"
+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 <[e-mail]>"
+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 <[e-mail]>"
+Description:
+		Value of register. This is used to read or reset the registers
+		where various performance statistics are counted for each block.
+