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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 <marc.zyngier@arm.com>
Signed-off-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Nate Watterson 2018-01-20 13:08:04 -05:00 committed by Will Deacon
parent 4c8996d7d7
commit 940ded9c21
1 changed files with 6 additions and 1 deletions
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7
drivers/iommu/arm-smmu-v3.c
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@ -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;
}