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| author | Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> | 2019-03-26 15:17:52 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-04-04 16:49:22 +0100 |
| commit | f202cdab3b48d8c2c1846c938ea69cb8aa897699 (patch) | |
| tree | 9e5d9d5240693756b81cc5116bb9c35e136f9662 /drivers/perf | |
| parent | 7d839b4b9e00645e49345d6ce5dfa8edf53c1a21 (diff) | |
| download | linux-f202cdab3b48d8c2c1846c938ea69cb8aa897699.tar.gz linux-f202cdab3b48d8c2c1846c938ea69cb8aa897699.tar.bz2 linux-f202cdab3b48d8c2c1846c938ea69cb8aa897699.zip | |
perf/smmuv3: Add MSI irq support
This adds support for MSI-based counter overflow interrupt.
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_smmuv3_pmu.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index a6d2e3ce94df..a4f4b488a2de 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -67,6 +67,7 @@ #define SMMU_PMCG_OVSSET0 0xCC0 #define SMMU_PMCG_CFGR 0xE00 #define SMMU_PMCG_CFGR_SID_FILTER_TYPE BIT(23) +#define SMMU_PMCG_CFGR_MSI BIT(21) #define SMMU_PMCG_CFGR_RELOC_CTRS BIT(20) #define SMMU_PMCG_CFGR_SIZE GENMASK(13, 8) #define SMMU_PMCG_CFGR_NCTR GENMASK(5, 0) @@ -77,6 +78,12 @@ #define SMMU_PMCG_IRQ_CTRL 0xE50 #define SMMU_PMCG_IRQ_CTRL_IRQEN BIT(0) #define SMMU_PMCG_IRQ_CFG0 0xE58 +#define SMMU_PMCG_IRQ_CFG1 0xE60 +#define SMMU_PMCG_IRQ_CFG2 0xE64 + +/* MSI config fields */ +#define MSI_CFG0_ADDR_MASK GENMASK_ULL(51, 2) +#define MSI_CFG2_MEMATTR_DEVICE_nGnRE 0x1 #define SMMU_PMCG_DEFAULT_FILTER_SPAN 1 #define SMMU_PMCG_DEFAULT_FILTER_SID GENMASK(31, 0) @@ -580,11 +587,62 @@ 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) { unsigned long flags = IRQF_NOBALANCING | IRQF_SHARED | IRQF_NO_THREAD; 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, |