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SubjectRe: [PATCH 2/3] soc: sifive: Add SiFive private L2 cache PMU driver
From
On 20/06/2023 04:14, Eric Lin wrote:
> On Fri, Jun 16, 2023 at 6:13 PM Conor Dooley <conor.dooley@microchip.com> wrote:
>>
>> On Fri, Jun 16, 2023 at 02:32:09PM +0800, Eric Lin wrote:
>>> From: Greentime Hu <greentime.hu@sifive.com>
>>>
>>> This adds SiFive private L2 cache PMU driver. User
>>> can use perf tool to profile by event name and event id.
>>>
>>> Example:
>>> $ perf stat -C 0 -e /sifive_pl2_pmu/inner_acquire_block_btot/
>>> -e /sifive_pl2_pmu/inner_acquire_block_ntob/
>>> -e /sifive_pl2_pmu/inner_acquire_block_ntot/ ls
>>>
>>> Performance counter stats for 'CPU(s) 0':
>>>
>>> 300 sifive_pl2_pmu/inner_acquire_block_btot/
>>> 17801 sifive_pl2_pmu/inner_acquire_block_ntob/
>>> 5253 sifive_pl2_pmu/inner_acquire_block_ntot/
>>>
>>> 0.088917326 seconds time elapsed
>>>
>>> $ perf stat -C 0 -e /sifive_pl2_pmu/event=0x10001/
>>> -e /sifive_pl2_pmu/event=0x4001/
>>> -e /sifive_pl2_pmu/event=0x8001/ ls
>>>
>>> Performance counter stats for 'CPU(s) 0':
>>>
>>> 251 sifive_pl2_pmu/event=0x10001/
>>> 2620 sifive_pl2_pmu/event=0x4001/
>>> 644 sifive_pl2_pmu/event=0x8001/
>>>
>>> 0.092827110 seconds time elapsed
>>>
>>> Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
>>> Signed-off-by: Eric Lin <eric.lin@sifive.com>
>>> Reviewed-by: Zong Li <zong.li@sifive.com>
>>> Reviewed-by: Nick Hu <nick.hu@sifive.com>
>>> ---
>>> drivers/soc/sifive/Kconfig | 9 +
>>> drivers/soc/sifive/Makefile | 1 +
>>> drivers/soc/sifive/sifive_pl2.h | 20 +
>>> drivers/soc/sifive/sifive_pl2_cache.c | 16 +
>>> drivers/soc/sifive/sifive_pl2_pmu.c | 669 ++++++++++++++++++++++++++
>>
>> Perf drivers should be in drivers/perf, no?
>>
>
> Hi Conor,
>
> Yes, I see most of the drivers are in the drivers/perf.
>
> But I grep perf_pmu_register(), it seems not all the pmu drivers are
> in drivers/perf as below:
>
> arch/arm/mach-imx/mmdc.c:517: ret =
> perf_pmu_register(&(pmu_mmdc->pmu), name, -1);
> arch/arm/mm/cache-l2x0-pmu.c:552: ret =
> perf_pmu_register(l2x0_pmu, l2x0_name, -1);
> ...
> drivers/dma/idxd/perfmon.c:627: rc = perf_pmu_register(&idxd_pmu->pmu,
> idxd_pmu->name, -1);
> drivers/fpga/dfl-fme-perf.c:904:static int
> fme_perf_pmu_register(struct platform_device *pdev,
> drivers/fpga/dfl-fme-perf.c:929: ret = perf_pmu_register(pmu, name, -1);
> ...
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:549: ret =
> perf_pmu_register(&pmu_entry->pmu, pmu_name, -1);
> drivers/gpu/drm/i915/i915_pmu.c:1190: ret =
> perf_pmu_register(&pmu->base, pmu->name, -1);
> drivers/hwtracing/coresight/coresight-etm-perf.c:907: ret =
> perf_pmu_register(&etm_pmu, CORESIGHT_ETM_PMU_NAME, -1);
> drivers/hwtracing/ptt/hisi_ptt.c:895: ret =
> perf_pmu_register(&hisi_ptt->hisi_ptt_pmu, pmu_name, -1);
> drivers/iommu/intel/perfmon.c:570: return
> perf_pmu_register(&iommu_pmu->pmu, iommu_pmu->pmu.name, -1);
> drivers/nvdimm/nd_perf.c:309: rc = perf_pmu_register(&nd_pmu->pmu,
> nd_pmu->pmu.name, -1);
> ...
>
> I just wondering what kind of pmu drivers should be in drivers/perf
> and what kind of pmu drivers should not be in drivers/perf.
> Thanks.
>

Given the registers for the l2 cache controls and l2 pmu don't overlap
do we need the pmu and general cache drivers together?

--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius

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