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iommu/arm-smmu: Report USF more clearly

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Although CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT is a welcome tool
for smoking out inadequate firmware, the failure mode is non-obvious
and can be confusing for end users. Add some special-case reporting of
Unidentified Stream Faults to help clarify this particular symptom.
Since we're adding yet another print to the mix, also break out an
explicit ratelimit state to make sure everything stays together (and
reduce the static storage footprint a little).

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2019-09-17 15:45:34 +01:00 committed by Will Deacon
parent 696bcfb709
commit 931a0ba638
2 changed files with 18 additions and 5 deletions
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15
drivers/iommu/arm-smmu.c
View File

@ -36,6 +36,7 @@
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/ratelimit.h>
#include <linux/slab.h>
#include <linux/amba/bus.h>
@ -477,6 +478,8 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
{
u32 gfsr, gfsynr0, gfsynr1, gfsynr2;
struct arm_smmu_device *smmu = dev;
static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
gfsr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_sGFSR);
gfsynr0 = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_sGFSYNR0);
@ -486,11 +489,19 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
if (!gfsr)
return IRQ_NONE;
dev_err_ratelimited(smmu->dev,
if (__ratelimit(&rs)) {
if (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) &&
(gfsr & sGFSR_USF))
dev_err(smmu->dev,
"Blocked unknown Stream ID 0x%hx; boot with \"arm-smmu.disable_bypass=0\" to allow, but this may have security implications\n",
(u16)gfsynr1);
else
dev_err(smmu->dev,
"Unexpected global fault, this could be serious\n");
dev_err_ratelimited(smmu->dev,
dev_err(smmu->dev,
"\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n",
gfsr, gfsynr0, gfsynr1, gfsynr2);
}
arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sGFSR, gfsr);
return IRQ_HANDLED;

2
drivers/iommu/arm-smmu.h
View File

@ -79,6 +79,8 @@
#define ID7_MINOR GENMASK(3, 0)
#define ARM_SMMU_GR0_sGFSR 0x48
#define sGFSR_USF BIT(1)
#define ARM_SMMU_GR0_sGFSYNR0 0x50
#define ARM_SMMU_GR0_sGFSYNR1 0x54
#define ARM_SMMU_GR0_sGFSYNR2 0x58