From: Will Deacon Date: Wed, 31 Jul 2013 18:21:26 +0000 (+0100) Subject: iommu/arm-smmu: Tighten up global fault reporting X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=adaba320916d246af56821a1aab81a715091e7e5;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git iommu/arm-smmu: Tighten up global fault reporting On systems which use a single, combined irq line for the SMMU, context faults may result in us spuriously reporting global faults with zero status registers. This patch fixes up the fsr checks in both the context and global fault interrupt handlers, so that we only report the fault if the fsr indicates something did indeed go awry. Signed-off-by: Will Deacon Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index da8af45634ac..3a595bb5b824 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -305,7 +305,7 @@ #define FSR_IGN (FSR_AFF | FSR_ASF | FSR_TLBMCF | \ FSR_TLBLKF) #define FSR_FAULT (FSR_MULTI | FSR_SS | FSR_UUT | \ - FSR_EF | FSR_PF | FSR_TF) + FSR_EF | FSR_PF | FSR_TF | FSR_IGN) #define FSYNR0_WNR (1 << 4) @@ -590,6 +590,9 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev) void __iomem *gr0_base = ARM_SMMU_GR0(smmu); gfsr = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR); + if (!gfsr) + return IRQ_NONE; + gfsynr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR0); gfsynr1 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR1); gfsynr2 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR2); @@ -601,7 +604,7 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev) gfsr, gfsynr0, gfsynr1, gfsynr2); writel(gfsr, gr0_base + ARM_SMMU_GR0_sGFSR); - return IRQ_NONE; + return IRQ_HANDLED; } static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)