[PATCH v2] iommu/arm-smmu-v3: limit reporting of MSI allocation failures

[Nate Watterson]

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.

Signed-off-by: Nate Watterson <nwatters@xxxxxxxxxxxxxx>
Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
 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 744592d..00de028 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;
 	}
 
-- 
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