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Subject[PATCH v2 1/1] iommu/arm-smmu: Log CBFRSYNRA register on context fault
Date
Bits[15:0] in CBFRSYNRA register contain information about
StreamID of the incoming transaction that generated the
fault. Dump CBFRSYNRA register to get this info.
This is specially useful in a distributed SMMU architecture
where multiple masters are connected to the SMMU.
SID information helps to quickly identify the faulting
master device.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

Changes since v1:
- Addressed review comments, given by Bjorn, for nits.

drivers/iommu/arm-smmu-regs.h | 2 ++
drivers/iommu/arm-smmu.c | 7 +++++--
2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm-smmu-regs.h b/drivers/iommu/arm-smmu-regs.h
index a1226e4ab5f8..e9132a926761 100644
--- a/drivers/iommu/arm-smmu-regs.h
+++ b/drivers/iommu/arm-smmu-regs.h
@@ -147,6 +147,8 @@ enum arm_smmu_s2cr_privcfg {
#define CBAR_IRPTNDX_SHIFT 24
#define CBAR_IRPTNDX_MASK 0xff

+#define ARM_SMMU_GR1_CBFRSYNRA(n) (0x400 + ((n) << 2))
+
#define ARM_SMMU_GR1_CBA2R(n) (0x800 + ((n) << 2))
#define CBA2R_RW64_32BIT (0 << 0)
#define CBA2R_RW64_64BIT (1 << 0)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 045d93884164..e000473f8205 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -575,7 +575,9 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
struct arm_smmu_device *smmu = smmu_domain->smmu;
+ void __iomem *gr1_base = ARM_SMMU_GR1(smmu);
void __iomem *cb_base;
+ u32 cbfrsynra;

cb_base = ARM_SMMU_CB(smmu, cfg->cbndx);
fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR);
@@ -585,10 +587,11 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)

fsynr = readl_relaxed(cb_base + ARM_SMMU_CB_FSYNR0);
iova = readq_relaxed(cb_base + ARM_SMMU_CB_FAR);
+ cbfrsynra = readl_relaxed(gr1_base + ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx));

dev_err_ratelimited(smmu->dev,
- "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cb=%d\n",
- fsr, iova, fsynr, cfg->cbndx);
+ "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
+ fsr, iova, fsynr, cbfrsynra, cfg->cbndx);

writel(fsr, cb_base + ARM_SMMU_CB_FSR);
return IRQ_HANDLED;
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
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