| Message ID | 20190415080734.6843-1-vivek.gautam@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/1] iommu/arm-smmu: Add SID information to context fault log | expand |
Trimming CC list for very minor suggestions (feel free to ignore). On 15/04/2019 10:07, Vivek Gautam wrote: > Extract the SID and add the information to context fault log. > This is specially useful in a distributed smmu architecture > where multiple masters are connected to smmu. SID information > helps to quickly identify the faulting master device. I find it slightly clearer to keep acronyms capitalized, such as SMMU. > @@ -575,7 +575,10 @@ 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; > + u16 sid; > > cb_base = ARM_SMMU_CB(smmu, cfg->cbndx); > fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); > @@ -586,9 +589,16 @@ 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)); I find it slightly clearer to write void __iomem *reg; ... reg = ARM_SMMU_GR1(smmu) + ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx); cbfrsynra = readl_relaxed(reg); Regards.
On 15/04/2019 09:07, Vivek Gautam wrote: > Extract the SID and add the information to context fault log. > This is specially useful in a distributed smmu architecture > where multiple masters are connected to smmu. SID information > helps to quickly identify the faulting master device. Hmm, given how it's UNKNOWN for translation faults, which are arguably the most likely context fault, I reckon it probably makes more sense to just dump the raw register value for the user to interpret, as we do for fsr/fsynr. Robin. > Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> > --- > drivers/iommu/arm-smmu-regs.h | 4 ++++ > drivers/iommu/arm-smmu.c | 14 ++++++++++++-- > 2 files changed, 16 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/arm-smmu-regs.h b/drivers/iommu/arm-smmu-regs.h > index a1226e4ab5f8..e5be0344b610 100644 > --- a/drivers/iommu/arm-smmu-regs.h > +++ b/drivers/iommu/arm-smmu-regs.h > @@ -147,6 +147,10 @@ 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 CBFRSYNRA_V2_SID_MASK 0xffff > +#define CBFRSYNRA_V1_SID_MASK 0x7fff > + > #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..aa3426dc68d0 100644 > --- a/drivers/iommu/arm-smmu.c > +++ b/drivers/iommu/arm-smmu.c > @@ -575,7 +575,10 @@ 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; > + u16 sid; > > cb_base = ARM_SMMU_CB(smmu, cfg->cbndx); > fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); > @@ -586,9 +589,16 @@ 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)); > + if (smmu->version > ARM_SMMU_V1) > + sid = cbfrsynra & CBFRSYNRA_V2_SID_MASK; > + else > + sid = cbfrsynra & CBFRSYNRA_V1_SID_MASK; > + > 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, cb=%d sid = %u\n", > + fsr, iova, fsynr, cfg->cbndx, sid); > > writel(fsr, cb_base + ARM_SMMU_CB_FSR); > return IRQ_HANDLED; >
Hi Marc, On 4/15/2019 2:24 PM, Marc Gonzalez wrote: > Trimming CC list for very minor suggestions (feel free to ignore) Thanks for the review. Please find my responses inline below. > > On 15/04/2019 10:07, Vivek Gautam wrote: > >> Extract the SID and add the information to context fault log. >> This is specially useful in a distributed smmu architecture >> where multiple masters are connected to smmu. SID information >> helps to quickly identify the faulting master device. > I find it slightly clearer to keep acronyms capitalized, such as SMMU. Sure, will change it. > > >> @@ -575,7 +575,10 @@ 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; >> + u16 sid; >> >> cb_base = ARM_SMMU_CB(smmu, cfg->cbndx); >> fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); >> @@ -586,9 +589,16 @@ 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)); > I find it slightly clearer to write > > void __iomem *reg; > ... > reg = ARM_SMMU_GR1(smmu) + ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx); > cbfrsynra = readl_relaxed(reg); I would actually argue here, to go with the flow of how this function declares the variables, for the simple case of symmetry. Let me know what do you think. Thanks & regards Vivek > > Regards.
On 4/15/2019 3:11 PM, Robin Murphy wrote: > On 15/04/2019 09:07, Vivek Gautam wrote: >> Extract the SID and add the information to context fault log. >> This is specially useful in a distributed smmu architecture >> where multiple masters are connected to smmu. SID information >> helps to quickly identify the faulting master device. > > Hmm, given how it's UNKNOWN for translation faults, which are arguably > the most likely context fault, I reckon it probably makes more sense > to just dump the raw register value for the user to interpret, as we > do for fsr/fsynr. Thanks Robin. Sure will update it to dump the raw register value. Regards Vivek > > Robin. > >> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> >> --- >> drivers/iommu/arm-smmu-regs.h | 4 ++++ >> drivers/iommu/arm-smmu.c | 14 ++++++++++++-- >> 2 files changed, 16 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/iommu/arm-smmu-regs.h >> b/drivers/iommu/arm-smmu-regs.h >> index a1226e4ab5f8..e5be0344b610 100644 >> --- a/drivers/iommu/arm-smmu-regs.h >> +++ b/drivers/iommu/arm-smmu-regs.h >> @@ -147,6 +147,10 @@ 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 CBFRSYNRA_V2_SID_MASK 0xffff >> +#define CBFRSYNRA_V1_SID_MASK 0x7fff >> + >> #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..aa3426dc68d0 100644 >> --- a/drivers/iommu/arm-smmu.c >> +++ b/drivers/iommu/arm-smmu.c >> @@ -575,7 +575,10 @@ 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; >> + u16 sid; >> cb_base = ARM_SMMU_CB(smmu, cfg->cbndx); >> fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); >> @@ -586,9 +589,16 @@ 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)); >> + if (smmu->version > ARM_SMMU_V1) >> + sid = cbfrsynra & CBFRSYNRA_V2_SID_MASK; >> + else >> + sid = cbfrsynra & CBFRSYNRA_V1_SID_MASK; >> + >> 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, >> cb=%d sid = %u\n", >> + fsr, iova, fsynr, cfg->cbndx, sid); >> writel(fsr, cb_base + ARM_SMMU_CB_FSR); >> return IRQ_HANDLED; >>
diff --git a/drivers/iommu/arm-smmu-regs.h b/drivers/iommu/arm-smmu-regs.h index a1226e4ab5f8..e5be0344b610 100644 --- a/drivers/iommu/arm-smmu-regs.h +++ b/drivers/iommu/arm-smmu-regs.h @@ -147,6 +147,10 @@ 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 CBFRSYNRA_V2_SID_MASK 0xffff +#define CBFRSYNRA_V1_SID_MASK 0x7fff + #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..aa3426dc68d0 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -575,7 +575,10 @@ 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; + u16 sid; cb_base = ARM_SMMU_CB(smmu, cfg->cbndx); fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); @@ -586,9 +589,16 @@ 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)); + if (smmu->version > ARM_SMMU_V1) + sid = cbfrsynra & CBFRSYNRA_V2_SID_MASK; + else + sid = cbfrsynra & CBFRSYNRA_V1_SID_MASK; + 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, cb=%d sid = %u\n", + fsr, iova, fsynr, cfg->cbndx, sid); writel(fsr, cb_base + ARM_SMMU_CB_FSR); return IRQ_HANDLED;
Extract the SID and add the information to context fault log. This is specially useful in a distributed smmu architecture where multiple masters are connected to smmu. SID information helps to quickly identify the faulting master device. Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> --- drivers/iommu/arm-smmu-regs.h | 4 ++++ drivers/iommu/arm-smmu.c | 14 ++++++++++++-- 2 files changed, 16 insertions(+), 2 deletions(-)