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| author |  Georgi Djakov <quic_c_gdjako@quicinc.com>
| 2024-04-17 06:37:27 -0700 |
|---|---|---|
| committer |  Will Deacon <will@kernel.org>
| 2024-04-18 15:48:01 +0100 |
| commit | 960be6e10d4fcb18cfe863e0ceb3213a75eecb81 (patch) | |
| tree | 866bcad3e5e9898b2eba8f2b18db4a1854fb66a8 /drivers/iommu/arm | |
| parent | iommu/arm-smmu-qcom-debug: Add support for TBUs (diff) | |
| download | linux-960be6e10d4fcb18cfe863e0ceb3213a75eecb81.tar.gz linux-960be6e10d4fcb18cfe863e0ceb3213a75eecb81.tar.bz2 linux-960be6e10d4fcb18cfe863e0ceb3213a75eecb81.zip | |
iommu/arm-smmu: Allow using a threaded handler for context interrupts
Threaded IRQ handlers run in a less critical context compared to normal
IRQs, so they can perform more complex and time-consuming operations
without causing significant delays in other parts of the kernel.
During a context fault, it might be needed to do more processing and
gather debug information from TBUs in the handler. These operations may
sleep, so add an option to use a threaded IRQ handler in these cases.
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
Link: https://lore.kernel.org/r/20240417133731.2055383-4-quic_c_gdjako@quicinc.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/arm')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu/arm-smmu.c | 12 | ||||
| -rw-r--r-- | drivers/iommu/arm/arm-smmu/arm-smmu.h | 1 |
2 files changed, 11 insertions, 2 deletions
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index 5935f44e1d1d..87c81f75cf84 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -806,8 +806,16 @@ static int arm_smmu_init_domain_context(struct arm_smmu_domain *smmu_domain, else context_fault = arm_smmu_context_fault; - ret = devm_request_irq(smmu->dev, irq, context_fault, IRQF_SHARED, - "arm-smmu-context-fault", smmu_domain); + if (smmu->impl && smmu->impl->context_fault_needs_threaded_irq) + ret = devm_request_threaded_irq(smmu->dev, irq, NULL, + context_fault, + IRQF_ONESHOT | IRQF_SHARED, + "arm-smmu-context-fault", + smmu_domain); + else + ret = devm_request_irq(smmu->dev, irq, context_fault, IRQF_SHARED, + "arm-smmu-context-fault", smmu_domain); + if (ret < 0) { dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n", cfg->irptndx, irq); diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h index 1670e95c4637..4765c6945c34 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h @@ -438,6 +438,7 @@ struct arm_smmu_impl { int (*def_domain_type)(struct device *dev); irqreturn_t (*global_fault)(int irq, void *dev); irqreturn_t (*context_fault)(int irq, void *dev); + bool context_fault_needs_threaded_irq; int (*alloc_context_bank)(struct arm_smmu_domain *smmu_domain, struct arm_smmu_device *smmu, struct device *dev, int start); |