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SubjectRe: [PATCH v10 5/7] perf: cavium: Support memory controller PMU counters
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On 25/09/17 13:35, Jan Glauber wrote:
> Add support for the PMU counters on Cavium SOC memory controllers.
>
> This patch also adds generic functions to allow supporting more
> devices with PMU counters.
>
> Properties of the LMC PMU counters:
> - not stoppable
> - fixed purpose
> - read-only
> - one PCI device per memory controller
>
> Signed-off-by: Jan Glauber <jglauber@cavium.com>
> ---
> drivers/perf/Kconfig | 8 +
> drivers/perf/Makefile | 1 +
> drivers/perf/cavium_pmu.c | 430 ++++++++++++++++++++++++++++++++++++++++
> drivers/soc/cavium/cavium_lmc.c | 4 +
> include/linux/cpuhotplug.h | 1 +
> include/linux/soc/cavium/lmc.h | 3 +
> 6 files changed, 447 insertions(+)
> create mode 100644 drivers/perf/cavium_pmu.c

> +int cvm_lmc_pmu_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> +{
> + struct cvm_pmu_dev *next, *lmc;
> + int nr = 0, ret = -ENOMEM;
> + char *name;
> +
> + lmc = devm_kzalloc(&pdev->dev, sizeof(*lmc), GFP_KERNEL);
> + if (!lmc)
> + return -ENOMEM;
> +
> + lmc->map = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0),
> + pci_resource_len(pdev, 0));
> + if (!lmc->map)
> + return -EINVAL;
> +
> + list_for_each_entry(next, &cvm_pmu_lmcs, entry)
> + nr++;
> + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "lmc%d", nr);
> + if (!name)
> + return -ENOMEM;
> +
> + lmc->pdev = pdev;
> + lmc->num_counters = ARRAY_SIZE(cvm_pmu_lmc_events_attr) - 1;
> + lmc->pmu = (struct pmu) {
> + .task_ctx_nr = perf_invalid_context,
> + .name = name,
> + .event_init = cvm_pmu_event_init,
> + .add = cvm_pmu_lmc_add,
> + .del = cvm_pmu_del,
> + .start = cvm_pmu_start,
> + .stop = cvm_pmu_stop,
> + .read = cvm_pmu_read,
> + .attr_groups = cvm_pmu_lmc_attr_groups,
> + };
> +

You need to fill in the "module" field of the PMU to prevent the module from
being unloaded while the PMU is active.

See :

http://lists.infradead.org/pipermail/linux-arm-kernel/2017-November/540647.html

Suzuki

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