Re: [PATCH 2/3] arm64: perf: Support Denver and Carmel PMUs

On Tue, Dec 14, 2021 at 12:33:53PM +0000, Will Deacon wrote:

On Wed, Dec 08, 2021 at 03:36:02PM +0100, Thierry Reding wrote:

quoted

On Tue, Dec 07, 2021 at 04:03:25PM +0000, Mark Rutland wrote:

quoted

On Tue, Dec 07, 2021 at 04:07:45PM +0100, Thierry Reding wrote:

quoted

From: Thierry Reding <redacted>

Add support for the NVIDIA Denver and Carmel PMUs using the generic
PMUv3 event map for now.

Signed-off-by: Thierry Reding <redacted>
---
 arch/arm64/kernel/perf_event.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index b4044469527e..8c8cf369c450 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c

@@ -1247,6 +1247,18 @@ static int armv8_vulcan_pmu_init(struct arm_pmu *cpu_pmu)
 				       armv8_vulcan_map_event);
 }
 
+static int armv8_denver_pmu_init(struct arm_pmu *cpu_pmu)
+{
+	return armv8_pmu_init_nogroups(cpu_pmu, "armv8_nvidia_denver",
+				       armv8_pmuv3_map_event);
+}
+
+static int armv8_carmel_pmu_init(struct arm_pmu *cpu_pmu)
+{
+	return armv8_pmu_init_nogroups(cpu_pmu, "armv8_nvidia_carmel",
+				       armv8_pmuv3_map_event);
+}
+
 static const struct of_device_id armv8_pmu_of_device_ids[] = {
 	{.compatible = "arm,armv8-pmuv3",	.data = armv8_pmuv3_init},
 	{.compatible = "arm,cortex-a34-pmu",	.data = armv8_a34_pmu_init},

@@ -1265,6 +1277,8 @@ static const struct of_device_id armv8_pmu_of_device_ids[] = {
 	{.compatible = "arm,neoverse-n1-pmu",	.data = armv8_n1_pmu_init},
 	{.compatible = "cavium,thunder-pmu",	.data = armv8_thunder_pmu_init},
 	{.compatible = "brcm,vulcan-pmu",	.data = armv8_vulcan_pmu_init},
+	{.compatible = "nvidia,denver-pmu",	.data = armv8_denver_pmu_init},
+	{.compatible = "nvidia,carmel-pmu",	.data = armv8_carmel_pmu_init},

Super trivial nit, but could we please organise this alphabetically (i.e. with carmel first?)

With that:

Acked-by: Mark Rutland <mark.rutland@arm.com>

I see now that we messed up the order of "cavium,thunder-pmu" and
"brcm,vulcan-pmu", but otherwise this is ordered, and it's be nice to keep it
that way. I can fix the order of those two in a separate patch.

I ordered this chronologically (Denver for Tegra186 and Carmel for
Tegra194), which seemed a bit more natural, but I can reorder this
alphabetically if you prefer.

Would Will be the right person to pick this up or should I take it
through the Tegra tree and then ARM SoC?

Sorry, I missed this somehow. I've got some perf patches pending already, so
it would be easiest for me to take this one directly (and then I can apply
Robin's stuff on top). Is that ok?

Sure, works for me. Do you still want me to address Mark's comment
regarding the sorting order (chronological vs. alphabetical)? It wasn't
clear to me if Mark still wanted that after my explanation.

Thierry