On Fri, Jun 02, 2017 at 05:39:38PM +0100, Mark Rutland wrote:
> 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 <[email protected]>
> > ---
> > 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.
OK, will use kasprintf and embedd the char name * into cvm_pmu_dev so I
can free it on remove.
> > +
> > + list_add(&tlk->entry, &cvm_pmu_tlks);
>
> As withthe prio patch, please add the element to the list after
> handling the failure cases.
OK.
> > +
> > + 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.
