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SubjectRe: [PATCH v5 3/3] perf: cavium: Support transmit-link PMU counters
On Wed, May 17, 2017 at 10:31:22AM +0200, Jan Glauber wrote:
> Add support for the transmit-link (TLK) PMU counters found
> on Caviums SOCs with an interconnect.
>
> Signed-off-by: Jan Glauber <jglauber@cavium.com>
> ---
> drivers/edac/thunderx_edac.c | 7 ++
> drivers/perf/cavium_pmu.c | 223 +++++++++++++++++++++++++++++++++++++++-
> include/linux/perf/cavium_pmu.h | 1 +
> 3 files changed, 230 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/edac/thunderx_edac.c b/drivers/edac/thunderx_edac.c
> index 8de4faf..d3da6d3 100644
> --- a/drivers/edac/thunderx_edac.c
> +++ b/drivers/edac/thunderx_edac.c
> @@ -1496,6 +1496,10 @@ static int thunderx_ocx_probe(struct pci_dev *pdev,
>
> writeq(OCX_COM_INT_ENA_ALL, ocx->regs + OCX_COM_INT_ENA_W1S);
>
> + if (IS_ENABLED(CONFIG_CAVIUM_PMU))
> + ocx->pmu_data = cvm_pmu_probe(pdev, ocx->regs,
> + CVM_PMU_TLK);
> +
> return 0;
> err_free:
> edac_device_free_ctl_info(edac_dev);
> @@ -1509,6 +1513,9 @@ static void thunderx_ocx_remove(struct pci_dev *pdev)
> struct thunderx_ocx *ocx = edac_dev->pvt_info;
> int i;
>
> + if (IS_ENABLED(CONFIG_CAVIUM_PMU))
> + cvm_pmu_remove(pdev, ocx->pmu_data, CVM_PMU_TLK);
> +

As with the prior patch, I don't think we can handle the PMU like this.


[...]

> +static int cvm_pmu_tlk_add(struct perf_event *event, int flags)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> +
> + return cvm_pmu_add(event, flags, TLK_STAT_CTL_OFFSET,
> + TLK_STAT_OFFSET + hwc->config * 8);
> +}

> +static void *cvm_pmu_tlk_probe_unit(struct pci_dev *pdev, void __iomem *regs,
> + int nr)
> +{
> + struct cvm_pmu_dev *tlk;
> + int ret = -ENOMEM;
> + char name[12];
> +
> + tlk = kzalloc(sizeof(*tlk), GFP_KERNEL);
> + if (!tlk)
> + goto fail_nomem;
> +
> + memset(name, 0, 12);
> + snprintf(name, 12, "ocx_tlk%d", nr);

Please kasprintf() the name and pass it to perf_pmu_register().

AFAICT, pmu::name is a char *, and perf_pmu_register() doesn't make a copy, so
this isn't safe.

> +
> + list_add(&tlk->entry, &cvm_pmu_tlks);

As withthe prio patch, please add the element to the list after
handling the failure cases.

> +
> + tlk->pdev = pdev;
> + tlk->map = regs + TLK_START_ADDR + nr * TLK_UNIT_OFFSET;
> + tlk->num_counters = ARRAY_SIZE(cvm_pmu_tlk_events_attr) - 1;
> + tlk->pmu = (struct pmu) {
> + .name = name,
> + .task_ctx_nr = perf_invalid_context,
> + .pmu_enable = cvm_pmu_tlk_enable_pmu,
> + .pmu_disable = cvm_pmu_tlk_disable_pmu,
> + .event_init = cvm_pmu_event_init,
> + .add = cvm_pmu_tlk_add,
> + .del = cvm_pmu_del,
> + .start = cvm_pmu_start,
> + .stop = cvm_pmu_stop,
> + .read = cvm_pmu_read,
> + .attr_groups = cvm_pmu_tlk_attr_groups,
> + };
> +
> + cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CVM_ONLINE,
> + &tlk->cpuhp_node);
> +
> + /*
> + * perf PMU is CPU dependent so pick a random CPU and migrate away
> + * if it goes offline.
> + */
> + cpumask_set_cpu(smp_processor_id(), &tlk->active_mask);
> +
> + ret = perf_pmu_register(&tlk->pmu, tlk->pmu.name, -1);
> + if (ret)
> + goto fail_hp;
> +
> + tlk->event_valid = cvm_pmu_tlk_event_valid;
> + return tlk;
> +
> +fail_hp:
> + cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_CVM_ONLINE,
> + &tlk->cpuhp_node);
> + kfree(tlk);
> +fail_nomem:
> + return ERR_PTR(ret);
> +}

Thanks,
Mark.

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