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SubjectRe: [PATCH v3 2/3] perf: add arm64 smmuv3 pmu driver
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Hi Shameer,

One more thing...

On 21/09/18 16:08, Shameer Kolothum wrote:
[...]
> +static int smmu_pmu_probe(struct platform_device *pdev)
> +{
> + struct smmu_pmu *smmu_pmu;
> + struct resource *res_0, *res_1;
> + u32 cfgr, reg_size;
> + u64 ceid_64[2];
> + int irq, err;
> + char *name;
> + struct device *dev = &pdev->dev;
> +
> + smmu_pmu = devm_kzalloc(dev, sizeof(*smmu_pmu), GFP_KERNEL);
> + if (!smmu_pmu)
> + return -ENOMEM;
> +
> + smmu_pmu->dev = dev;
> +
> + platform_set_drvdata(pdev, smmu_pmu);
> + smmu_pmu->pmu = (struct pmu) {
> + .task_ctx_nr = perf_invalid_context,
> + .pmu_enable = smmu_pmu_enable,
> + .pmu_disable = smmu_pmu_disable,
> + .event_init = smmu_pmu_event_init,
> + .add = smmu_pmu_event_add,
> + .del = smmu_pmu_event_del,
> + .start = smmu_pmu_event_start,
> + .stop = smmu_pmu_event_stop,
> + .read = smmu_pmu_event_read,
> + .attr_groups = smmu_pmu_attr_grps,
> + };
> +
> + res_0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + smmu_pmu->reg_base = devm_ioremap_resource(dev, res_0);

We still need to solve the resource-claiming issue when one (or both) of
the PMCG pages belongs to the parent device's register space. I recall
we chucked a few nascent ideas about before; did anyone manage to come
up with anything concrete?

Robin.

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