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Date: Mon, 10 Sep 2018 16:55:01 +0000
From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To: Robin Murphy <robin.murphy@....com>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC: "will.deacon@....com" <will.deacon@....com>,
"mark.rutland@....com" <mark.rutland@....com>,
"Guohanjun (Hanjun Guo)" <guohanjun@...wei.com>,
John Garry <john.garry@...wei.com>,
"pabba@...eaurora.org" <pabba@...eaurora.org>,
"vkilari@...eaurora.org" <vkilari@...eaurora.org>,
"rruigrok@...eaurora.org" <rruigrok@...eaurora.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
Linuxarm <linuxarm@...wei.com>,
"neil.m.leeder@...il.com" <neil.m.leeder@...il.com>
Subject: RE: [PATCH v2 4/4] perf/smmuv3: Add MSI irq support
> -----Original Message-----
> From: Robin Murphy [mailto:robin.murphy@....com]
> Sent: 10 September 2018 12:15
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>;
> lorenzo.pieralisi@....com
> Cc: will.deacon@....com; mark.rutland@....com; Guohanjun (Hanjun Guo)
> <guohanjun@...wei.com>; John Garry <john.garry@...wei.com>;
> pabba@...eaurora.org; vkilari@...eaurora.org; rruigrok@...eaurora.org;
> linux-acpi@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; Linuxarm <linuxarm@...wei.com>;
> neil.m.leeder@...il.com
> Subject: Re: [PATCH v2 4/4] perf/smmuv3: Add MSI irq support
>
> On 2018-07-24 12:45 PM, Shameer Kolothum wrote:
> > This adds support for MSI based counter overflow interrupt.
> >
> > Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> > ---
> > drivers/perf/arm_smmuv3_pmu.c | 105
> +++++++++++++++++++++++++++++++++---------
> > 1 file changed, 84 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/perf/arm_smmuv3_pmu.c
> b/drivers/perf/arm_smmuv3_pmu.c
> > index b3dc394..ca69813 100644
> > --- a/drivers/perf/arm_smmuv3_pmu.c
> > +++ b/drivers/perf/arm_smmuv3_pmu.c
> > @@ -94,6 +94,10 @@
> > #define SMMU_PMCG_IRQ_CFG2 0xE64
> > #define SMMU_PMCG_IRQ_STATUS 0xE68
> >
> > +/* MSI config fields */
> > +#define MSI_CFG0_ADDR_MASK GENMASK_ULL(51, 2)
> > +#define MSI_CFG2_MEMATTR_DEVICE_nGnRE 0x1
> > +
> > #define SMMU_COUNTER_RELOAD BIT(31)
> > #define SMMU_DEFAULT_FILTER_SEC 0
> > #define SMMU_DEFAULT_FILTER_SPAN 1
> > @@ -657,14 +661,89 @@ static irqreturn_t smmu_pmu_handle_irq(int
> irq_num, void *data)
> > return IRQ_HANDLED;
> > }
> >
> > +static void smmu_pmu_free_msis(void *data)
> > +{
> > + struct device *dev = data;
> > +
> > + platform_msi_domain_free_irqs(dev);
> > +}
> > +
> > +static void smmu_pmu_write_msi_msg(struct msi_desc *desc, struct
> msi_msg *msg)
> > +{
> > + phys_addr_t doorbell;
> > + struct device *dev = msi_desc_to_dev(desc);
> > + struct smmu_pmu *pmu = dev_get_drvdata(dev);
> > +
> > + doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo;
> > + doorbell &= MSI_CFG0_ADDR_MASK;
> > +
> > + writeq_relaxed(doorbell, pmu->reg_base + SMMU_PMCG_IRQ_CFG0);
> > + writel_relaxed(msg->data, pmu->reg_base +
> SMMU_PMCG_IRQ_CFG1);
> > + writel_relaxed(MSI_CFG2_MEMATTR_DEVICE_nGnRE,
> > + pmu->reg_base + SMMU_PMCG_IRQ_CFG2);
> > +}
> > +
> > +static void smmu_pmu_setup_msi(struct smmu_pmu *pmu)
> > +{
> > + struct msi_desc *desc;
> > + struct device *dev = pmu->dev;
> > + int ret;
> > +
> > + /* Clear MSI address reg */
> > + writeq_relaxed(0, pmu->reg_base + SMMU_PMCG_IRQ_CFG0);
> > +
> > + /* MSI supported or not */
> > + if (!(readl(pmu->reg_base + SMMU_PMCG_CFGR) &
> SMMU_PMCG_CFGR_MSI))
> > + return;
> > +
> > + ret = platform_msi_domain_alloc_irqs(dev, 1,
> smmu_pmu_write_msi_msg);
> > + if (ret) {
> > + dev_warn(dev, "failed to allocate MSIs\n");
> > + return;
> > + }
> > +
> > + desc = first_msi_entry(dev);
> > + if (desc)
> > + pmu->irq = desc->irq;
> > +
> > + /* Add callback to free MSIs on teardown */
> > + devm_add_action(dev, smmu_pmu_free_msis, dev);
> > +}
> > +
> > +static int smmu_pmu_setup_irq(struct smmu_pmu *pmu)
> > +{
> > + int irq, ret = -ENXIO;
> > +
> > + smmu_pmu_setup_msi(pmu);
> > +
> > + irq = pmu->irq;
> > + if (irq)
> > + ret = devm_request_irq(pmu->dev, irq,
> smmu_pmu_handle_irq,
> > + IRQF_NOBALANCING | IRQF_SHARED |
> IRQF_NO_THREAD,
> > + "smmu-v3-pmu", pmu);
> > + return ret;
> > +}
> > +
> > static int smmu_pmu_reset(struct smmu_pmu *smmu_pmu)
> > {
> > + int ret;
> > +
> > /* Disable counter and interrupt */
> > writeq(smmu_pmu->counter_present_mask,
> > smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0);
> > writeq(smmu_pmu->counter_present_mask,
> > smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0);
> >
> > + ret = smmu_pmu_setup_irq(smmu_pmu);
>
> Why are we moving this out of probe? We may perform a reset more than
> once (e.g. if we get round to system PM support), at which point this
> looks logically wrong.
I didn’t consider that scenario. I will modify this in next.
Thanks,
Shameer
> Robin.
>
> > + if (ret) {
> > + dev_err(smmu_pmu->dev, "failed to setup irqs\n");
> > + return ret;
> > + }
> > +
> > + /* Pick one CPU to be the preferred one to use */
> > + smmu_pmu->on_cpu = smp_processor_id();
> > + WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(smmu_pmu-
> >on_cpu)));
> > +
> > smmu_pmu_disable(&smmu_pmu->pmu);
> > return 0;
> > }
> > @@ -738,26 +817,8 @@ static int smmu_pmu_probe(struct platform_device
> *pdev)
> > }
> >
> > irq = platform_get_irq(pdev, 0);
> > - if (irq < 0) {
> > - dev_err(dev, "Failed to get valid irq for smmu @%pa\n",
> > - &mem_resource_0->start);
> > - return irq;
> > - }
> > -
> > - err = devm_request_irq(dev, irq, smmu_pmu_handle_irq,
> > - IRQF_NOBALANCING | IRQF_SHARED |
> IRQF_NO_THREAD,
> > - "smmu-pmu", smmu_pmu);
> > - if (err) {
> > - dev_err(dev,
> > - "Unable to request IRQ%d for SMMU PMU
> counters\n", irq);
> > - return err;
> > - }
> > -
> > - smmu_pmu->irq = irq;
> > -
> > - /* Pick one CPU to be the preferred one to use */
> > - smmu_pmu->on_cpu = smp_processor_id();
> > - WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(smmu_pmu-
> >on_cpu)));
> > + if (irq > 0)
> > + smmu_pmu->irq = irq;
> >
> > smmu_pmu->num_counters = get_num_counters(smmu_pmu);
> > smmu_pmu->counter_present_mask = GENMASK(smmu_pmu-
> >num_counters - 1, 0);
> > @@ -765,7 +826,9 @@ static int smmu_pmu_probe(struct platform_device
> *pdev)
> > SMMU_PMCG_CFGR_SIZE_MASK) >>
> SMMU_PMCG_CFGR_SIZE_SHIFT;
> > smmu_pmu->counter_mask = GENMASK_ULL(reg_size, 0);
> >
> > - smmu_pmu_reset(smmu_pmu);
> > + err = smmu_pmu_reset(smmu_pmu);
> > + if (err)
> > + return err;
> >
> > err = cpuhp_state_add_instance_nocalls(cpuhp_state_num,
> > &smmu_pmu->node);
> >
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