On Mon 15 Apr 10:37 PDT 2019, Vivek Gautam wrote: > 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@xxxxxxxxxxxxxx> > --- > > V1 of the patch available @ > https://lore.kernel.org/patchwork/patch/1061615/ > > Changes from v1: > - Dump the raw register value of CBFRSYNRA register in the > context fault log rather than extracting the SID inforamtion > and dumping that. > > drivers/iommu/arm-smmu-regs.h | 2 ++ > drivers/iommu/arm-smmu.c | 8 ++++++-- > 2 files changed, 8 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..a4773e8c6b0e 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 +587,12 @@ 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)); The 80 char limit is more like a guideline anyways...please don't wrap this. > > 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", Drop the spaces around '='. With those addressed, you have my Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> Regards, Bjorn > + 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 >
