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iommu/arm-smmu: Implement DOMAIN_ATTR_NON_FATAL_FAULTS

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Unhandled context faults should be fatal unless explicitly requested
otherwise by the client.  Implement the DOMAIN_ATTR_NON_FATAL_FAULTS
attribute for this purpose.

Change-Id: I414fcc6000a6c47b3cbf77b1098c8b7895cbb20d
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2015-09-25 17:29:27 -07:00 • committed by David Keitel
parent 5ee33ef836
commit 8387b734ea
1 changed files with 16 additions and 0 deletions
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16
drivers/iommu/arm-smmu.c
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@ -449,6 +449,7 @@ struct arm_smmu_domain {
struct list_head unassign_list;
struct mutex assign_lock;
struct list_head secure_pool_list;
bool non_fatal_faults;
};
static struct iommu_ops arm_smmu_ops;
@ -1162,6 +1163,7 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
void __iomem *gr1_base;
phys_addr_t phys_soft;
u32 frsynra;
bool non_fatal_fault = smmu_domain->non_fatal_faults;
static DEFINE_RATELIMIT_STATE(_rs,
DEFAULT_RATELIMIT_INTERVAL,
@ -1256,6 +1258,11 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
}
ret = IRQ_NONE;
resume = RESUME_TERMINATE;
if (!non_fatal_fault) {
dev_err(smmu->dev,
"Unhandled context faults are fatal on this domain. Going down now...\n");
BUG();
}
}
/*
@ -2667,6 +2674,11 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
& (1 << DOMAIN_ATTR_DYNAMIC));
ret = 0;
break;
case DOMAIN_ATTR_NON_FATAL_FAULTS:
*((int *)data) = !!(smmu_domain->attributes
& (1 << DOMAIN_ATTR_NON_FATAL_FAULTS));
ret = 0;
break;
default:
ret = -ENODEV;
break;
@ -2774,6 +2786,10 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
smmu_domain->cfg.cbndx = *((unsigned int *)data);
ret = 0;
break;
case DOMAIN_ATTR_NON_FATAL_FAULTS:
smmu_domain->non_fatal_faults = *((int *)data);
ret = 0;
break;
default:
ret = -ENODEV;
break;