From 940ded9c21fde7c47c64d5cc74e22300fb89e6b7 Mon Sep 17 00:00:00 2001 From: Nate Watterson Date: Sat, 20 Jan 2018 13:08:04 -0500 Subject: [PATCH] iommu/arm-smmu-v3: limit reporting of MSI allocation failures Currently, the arm-smmu-v3 driver expects to allocate MSIs for all SMMUs with FEAT_MSI set. This results in unwarranted "failed to allocate MSIs" warnings being printed on systems where FW was either deliberately configured to force the use of SMMU wired interrupts -or- is altogether incapable of describing SMMU MSI topology (ACPI IORT prior to rev.C). Remedy this by checking msi_domain before attempting to allocate SMMU MSIs. Acked-by: Marc Zyngier Signed-off-by: Nate Watterson Signed-off-by: Sinan Kaya Signed-off-by: Will Deacon --- drivers/iommu/arm-smmu-v3.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index ebf22e9..d9b944e 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -2328,10 +2328,15 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu) if (!(smmu->features & ARM_SMMU_FEAT_MSI)) return; + if (!dev->msi_domain) { + dev_info(smmu->dev, "msi_domain absent - falling back to wired irqs\n"); + return; + } + /* Allocate MSIs for evtq, gerror and priq. Ignore cmdq */ ret = platform_msi_domain_alloc_irqs(dev, nvec, arm_smmu_write_msi_msg); if (ret) { - dev_warn(dev, "failed to allocate MSIs\n"); + dev_warn(dev, "failed to allocate MSIs - falling back to wired irqs\n"); return; } -- 2.7.4