From: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org> To: will.deacon-5wv7dgnIgG8@public.gmane.org Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Subject: [PATCH] iommu/arm-smmu-v3: Warn about missing IRQs Date: Fri, 27 Oct 2017 14:08:16 +0100 [thread overview] Message-ID: <f03a7c9f0be2f0af461b61d18fff3c931da77ebb.1509109598.git.robin.murphy@arm.com> (raw) It is annoyingly non-obvious when DMA transactions silently go missing due to undetected SMMU faults. Help skip the first few debugging steps in those situations by making it clear when we have neither wired IRQs nor MSIs with which to raise error conditions. Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org> --- drivers/iommu/arm-smmu-v3.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index e67ba6c40faf..1a374c5c9507 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -2263,6 +2263,8 @@ static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu) "arm-smmu-v3-evtq", smmu); if (ret < 0) dev_warn(smmu->dev, "failed to enable evtq irq\n"); + } else { + dev_warn(smmu->dev, "no evtq irq - events will not be reported!\n"); } irq = smmu->cmdq.q.irq; @@ -2280,6 +2282,8 @@ static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu) 0, "arm-smmu-v3-gerror", smmu); if (ret < 0) dev_warn(smmu->dev, "failed to enable gerror irq\n"); + } else { + dev_warn(smmu->dev, "no gerr irq - errors will not be reported!\n"); } if (smmu->features & ARM_SMMU_FEAT_PRI) { -- 2.13.4.dirty
WARNING: multiple messages have this Message-ID (diff)
From: robin.murphy@arm.com (Robin Murphy) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] iommu/arm-smmu-v3: Warn about missing IRQs Date: Fri, 27 Oct 2017 14:08:16 +0100 [thread overview] Message-ID: <f03a7c9f0be2f0af461b61d18fff3c931da77ebb.1509109598.git.robin.murphy@arm.com> (raw) It is annoyingly non-obvious when DMA transactions silently go missing due to undetected SMMU faults. Help skip the first few debugging steps in those situations by making it clear when we have neither wired IRQs nor MSIs with which to raise error conditions. Signed-off-by: Robin Murphy <robin.murphy@arm.com> --- drivers/iommu/arm-smmu-v3.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index e67ba6c40faf..1a374c5c9507 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -2263,6 +2263,8 @@ static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu) "arm-smmu-v3-evtq", smmu); if (ret < 0) dev_warn(smmu->dev, "failed to enable evtq irq\n"); + } else { + dev_warn(smmu->dev, "no evtq irq - events will not be reported!\n"); } irq = smmu->cmdq.q.irq; @@ -2280,6 +2282,8 @@ static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu) 0, "arm-smmu-v3-gerror", smmu); if (ret < 0) dev_warn(smmu->dev, "failed to enable gerror irq\n"); + } else { + dev_warn(smmu->dev, "no gerr irq - errors will not be reported!\n"); } if (smmu->features & ARM_SMMU_FEAT_PRI) { -- 2.13.4.dirty
next reply other threads:[~2017-10-27 13:08 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-10-27 13:08 Robin Murphy [this message] 2017-10-27 13:08 ` [PATCH] iommu/arm-smmu-v3: Warn about missing IRQs Robin Murphy [not found] ` <f03a7c9f0be2f0af461b61d18fff3c931da77ebb.1509109598.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2017-10-27 16:52 ` Will Deacon 2017-10-27 16:52 ` Will Deacon
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