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drm/etnaviv: print MMU exception cause

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The MMU tells us the fault status. While the raw register value is
already printed, it's a bit more user friendly to translate the
fault reasons into human readable format.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
This commit is contained in:
Christian Gmeiner
2022-12-02 10:19:29 +01:00
committed by Lucas Stach
parent 50f79da49e
commit b4bc0e7493
1 changed files with 19 additions and 3 deletions
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22
drivers/gpu/drm/etnaviv/etnaviv_gpu.c
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@@ -1454,6 +1454,15 @@ static void sync_point_worker(struct work_struct *work)
static void dump_mmu_fault(struct etnaviv_gpu *gpu)
{
static const char *fault_reasons[] = {
"slave not present",
"page not present",
"write violation",
"out of bounds",
"read security violation",
"write security violation",
};
u32 status_reg, status;
int i;
@@ -1466,18 +1475,25 @@ static void dump_mmu_fault(struct etnaviv_gpu *gpu)
dev_err_ratelimited(gpu->dev, "MMU fault status 0x%08x\n", status);
for (i = 0; i < 4; i++) {
const char *reason = "unknown";
u32 address_reg;
u32 mmu_status;
if (!(status & (VIVS_MMUv2_STATUS_EXCEPTION0__MASK << (i * 4))))
mmu_status = (status >> (i * 4)) & VIVS_MMUv2_STATUS_EXCEPTION0__MASK;
if (!mmu_status)
continue;
if ((mmu_status - 1) < ARRAY_SIZE(fault_reasons))
reason = fault_reasons[mmu_status - 1];
if (gpu->sec_mode == ETNA_SEC_NONE)
address_reg = VIVS_MMUv2_EXCEPTION_ADDR(i);
else
address_reg = VIVS_MMUv2_SEC_EXCEPTION_ADDR;
dev_err_ratelimited(gpu->dev, "MMU %d fault addr 0x%08x\n", i,
gpu_read(gpu, address_reg));
dev_err_ratelimited(gpu->dev,
"MMU %d fault (%s) addr 0x%08x\n",
i, reason, gpu_read(gpu, address_reg));
}
}