evie/android_kernel_oneplus_msm8998
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iommu/arm-smmu: enable unidentified stream faults on unmapped access

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Currently when an SMMU client accesses an unmapped address the SMMU does
a bypass and propagates the request.  This can make it difficult to
debug problems when clients are accessing bogus addresses.  Enable the
sCR0 bit that causes the SMMU to raise an unidentified stream fault
rather than falling back to bypass when no mapping is found.

Change-Id: Ia0e40010c79b8a75954ae13ae60aca2d82ff76b6
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2014-11-10 14:23:49 -08:00 • committed by David Keitel
parent 50d5d44cc8
commit 9ecef3f459
1 changed files with 5 additions and 2 deletions
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7
drivers/iommu/arm-smmu.c
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@ -2158,8 +2158,11 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
/* Disable TLB broadcasting. */
reg |= (sCR0_VMIDPNE | sCR0_PTM);
/* Enable client access, but bypass when no mapping is found */
reg &= ~(sCR0_CLIENTPD | sCR0_USFCFG);
/* Enable client access */
reg &= ~sCR0_CLIENTPD;
/* Raise an unidentified stream fault on unmapped access */
reg |= sCR0_USFCFG;
/* Disable forced broadcasting */
reg &= ~sCR0_FB;