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iommu/arm-smmu: Pretty-print context fault related regs
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Parse out the bitfields for easier-to-read fault messages.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Link: https://lore.kernel.org/r/20240701162025.375134-4-robdclark@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
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Rob Clark authored and Will Deacon committed Jul 2, 2024
1 parent 5508978 commit d525b0a
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Showing 3 changed files with 92 additions and 51 deletions.
52 changes: 16 additions & 36 deletions drivers/iommu/arm/arm-smmu/arm-smmu-qcom-debug.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -383,64 +383,44 @@ irqreturn_t qcom_smmu_context_fault(int irq, void *dev)
struct arm_smmu_domain *smmu_domain = dev;
struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
struct arm_smmu_device *smmu = smmu_domain->smmu;
u32 fsr, fsynr, cbfrsynra, resume = 0;
struct arm_smmu_context_fault_info cfi;
u32 resume = 0;
int idx = smmu_domain->cfg.cbndx;
phys_addr_t phys_soft;
unsigned long iova;
int ret, tmp;

static DEFINE_RATELIMIT_STATE(_rs,
DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);

fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR);
if (!(fsr & ARM_SMMU_CB_FSR_FAULT))
return IRQ_NONE;
arm_smmu_read_context_fault_info(smmu, idx, &cfi);

fsynr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSYNR0);
iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR);
cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(idx));
if (!(cfi.fsr & ARM_SMMU_CB_FSR_FAULT))
return IRQ_NONE;

if (list_empty(&tbu_list)) {
ret = report_iommu_fault(&smmu_domain->domain, NULL, iova,
fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
ret = report_iommu_fault(&smmu_domain->domain, NULL, cfi.iova,
cfi.fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);

if (ret == -ENOSYS)
dev_err_ratelimited(smmu->dev,
"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
fsr, iova, fsynr, cbfrsynra, idx);
arm_smmu_print_context_fault_info(smmu, idx, &cfi);

arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, fsr);
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, cfi.fsr);
return IRQ_HANDLED;
}

phys_soft = ops->iova_to_phys(ops, iova);
phys_soft = ops->iova_to_phys(ops, cfi.iova);

tmp = report_iommu_fault(&smmu_domain->domain, NULL, iova,
fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
tmp = report_iommu_fault(&smmu_domain->domain, NULL, cfi.iova,
cfi.fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
if (!tmp || tmp == -EBUSY) {
ret = IRQ_HANDLED;
resume = ARM_SMMU_RESUME_TERMINATE;
} else {
phys_addr_t phys_atos = qcom_smmu_verify_fault(smmu_domain, iova, fsr);
phys_addr_t phys_atos = qcom_smmu_verify_fault(smmu_domain, cfi.iova, cfi.fsr);

if (__ratelimit(&_rs)) {
dev_err(smmu->dev,
"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
fsr, iova, fsynr, cbfrsynra, idx);
dev_err(smmu->dev,
"FSR = %08x [%s%s%s%s%s%s%s%s%s], SID=0x%x\n",
fsr,
(fsr & 0x02) ? "TF " : "",
(fsr & 0x04) ? "AFF " : "",
(fsr & 0x08) ? "PF " : "",
(fsr & 0x10) ? "EF " : "",
(fsr & 0x20) ? "TLBMCF " : "",
(fsr & 0x40) ? "TLBLKF " : "",
(fsr & 0x80) ? "MHF " : "",
(fsr & 0x40000000) ? "SS " : "",
(fsr & 0x80000000) ? "MULTI " : "",
cbfrsynra);
arm_smmu_print_context_fault_info(smmu, idx, &cfi);

dev_err(smmu->dev,
"soft iova-to-phys=%pa\n", &phys_soft);
Expand Down Expand Up @@ -474,10 +454,10 @@ irqreturn_t qcom_smmu_context_fault(int irq, void *dev)
*/
if (tmp != -EBUSY) {
/* Clear the faulting FSR */
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, fsr);
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, cfi.fsr);

/* Retry or terminate any stalled transactions */
if (fsr & ARM_SMMU_CB_FSR_SS)
if (cfi.fsr & ARM_SMMU_CB_FSR_SS)
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_RESUME, resume);
}

Expand Down
70 changes: 55 additions & 15 deletions drivers/iommu/arm/arm-smmu/arm-smmu.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -405,32 +405,72 @@ static const struct iommu_flush_ops arm_smmu_s2_tlb_ops_v1 = {
.tlb_add_page = arm_smmu_tlb_add_page_s2_v1,
};


void arm_smmu_read_context_fault_info(struct arm_smmu_device *smmu, int idx,
struct arm_smmu_context_fault_info *cfi)
{
cfi->iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR);
cfi->fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR);
cfi->fsynr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSYNR0);
cfi->cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(idx));
}

void arm_smmu_print_context_fault_info(struct arm_smmu_device *smmu, int idx,
const struct arm_smmu_context_fault_info *cfi)
{
dev_dbg(smmu->dev,
"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
cfi->fsr, cfi->iova, cfi->fsynr, cfi->cbfrsynra, idx);

dev_err(smmu->dev, "FSR = %08x [%s%sFormat=%u%s%s%s%s%s%s%s%s], SID=0x%x\n",
cfi->fsr,
(cfi->fsr & ARM_SMMU_CB_FSR_MULTI) ? "MULTI " : "",
(cfi->fsr & ARM_SMMU_CB_FSR_SS) ? "SS " : "",
(u32)FIELD_GET(ARM_SMMU_CB_FSR_FORMAT, cfi->fsr),
(cfi->fsr & ARM_SMMU_CB_FSR_UUT) ? " UUT" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_ASF) ? " ASF" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_TLBLKF) ? " TLBLKF" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_TLBMCF) ? " TLBMCF" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_EF) ? " EF" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_PF) ? " PF" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_AFF) ? " AFF" : "",
(cfi->fsr & ARM_SMMU_CB_FSR_TF) ? " TF" : "",
cfi->cbfrsynra);

dev_err(smmu->dev, "FSYNR0 = %08x [S1CBNDX=%u%s%s%s%s%s%s PLVL=%u]\n",
cfi->fsynr,
(u32)FIELD_GET(ARM_SMMU_CB_FSYNR0_S1CBNDX, cfi->fsynr),
(cfi->fsynr & ARM_SMMU_CB_FSYNR0_AFR) ? " AFR" : "",
(cfi->fsynr & ARM_SMMU_CB_FSYNR0_PTWF) ? " PTWF" : "",
(cfi->fsynr & ARM_SMMU_CB_FSYNR0_NSATTR) ? " NSATTR" : "",
(cfi->fsynr & ARM_SMMU_CB_FSYNR0_IND) ? " IND" : "",
(cfi->fsynr & ARM_SMMU_CB_FSYNR0_PNU) ? " PNU" : "",
(cfi->fsynr & ARM_SMMU_CB_FSYNR0_WNR) ? " WNR" : "",
(u32)FIELD_GET(ARM_SMMU_CB_FSYNR0_PLVL, cfi->fsynr));
}

static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
{
u32 fsr, fsynr, cbfrsynra;
unsigned long iova;
struct arm_smmu_context_fault_info cfi;
struct arm_smmu_domain *smmu_domain = dev;
struct arm_smmu_device *smmu = smmu_domain->smmu;
static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
int idx = smmu_domain->cfg.cbndx;
int ret;

fsr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSR);
if (!(fsr & ARM_SMMU_CB_FSR_FAULT))
return IRQ_NONE;
arm_smmu_read_context_fault_info(smmu, idx, &cfi);

fsynr = arm_smmu_cb_read(smmu, idx, ARM_SMMU_CB_FSYNR0);
iova = arm_smmu_cb_readq(smmu, idx, ARM_SMMU_CB_FAR);
cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(idx));
if (!(cfi.fsr & ARM_SMMU_CB_FSR_FAULT))
return IRQ_NONE;

ret = report_iommu_fault(&smmu_domain->domain, NULL, iova,
fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
ret = report_iommu_fault(&smmu_domain->domain, NULL, cfi.iova,
cfi.fsynr & ARM_SMMU_CB_FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);

if (ret == -ENOSYS)
dev_err_ratelimited(smmu->dev,
"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
fsr, iova, fsynr, cbfrsynra, idx);
if (ret == -ENOSYS && __ratelimit(&rs))
arm_smmu_print_context_fault_info(smmu, idx, &cfi);

arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, fsr);
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_FSR, cfi.fsr);
return IRQ_HANDLED;
}

Expand Down
21 changes: 21 additions & 0 deletions drivers/iommu/arm/arm-smmu/arm-smmu.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,7 @@ enum arm_smmu_cbar_type {
#define ARM_SMMU_CB_FSR 0x58
#define ARM_SMMU_CB_FSR_MULTI BIT(31)
#define ARM_SMMU_CB_FSR_SS BIT(30)
#define ARM_SMMU_CB_FSR_FORMAT GENMASK(10, 9)
#define ARM_SMMU_CB_FSR_UUT BIT(8)
#define ARM_SMMU_CB_FSR_ASF BIT(7)
#define ARM_SMMU_CB_FSR_TLBLKF BIT(6)
Expand All @@ -223,7 +224,14 @@ enum arm_smmu_cbar_type {
#define ARM_SMMU_CB_FAR 0x60

#define ARM_SMMU_CB_FSYNR0 0x68
#define ARM_SMMU_CB_FSYNR0_PLVL GENMASK(1, 0)
#define ARM_SMMU_CB_FSYNR0_WNR BIT(4)
#define ARM_SMMU_CB_FSYNR0_PNU BIT(5)
#define ARM_SMMU_CB_FSYNR0_IND BIT(6)
#define ARM_SMMU_CB_FSYNR0_NSATTR BIT(8)
#define ARM_SMMU_CB_FSYNR0_PTWF BIT(10)
#define ARM_SMMU_CB_FSYNR0_AFR BIT(11)
#define ARM_SMMU_CB_FSYNR0_S1CBNDX GENMASK(23, 16)

#define ARM_SMMU_CB_FSYNR1 0x6c

Expand Down Expand Up @@ -533,4 +541,17 @@ struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu);
void arm_smmu_write_context_bank(struct arm_smmu_device *smmu, int idx);
int arm_mmu500_reset(struct arm_smmu_device *smmu);

struct arm_smmu_context_fault_info {
unsigned long iova;
u32 fsr;
u32 fsynr;
u32 cbfrsynra;
};

void arm_smmu_read_context_fault_info(struct arm_smmu_device *smmu, int idx,
struct arm_smmu_context_fault_info *cfi);

void arm_smmu_print_context_fault_info(struct arm_smmu_device *smmu, int idx,
const struct arm_smmu_context_fault_info *cfi);

#endif /* _ARM_SMMU_H */

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