[PATCH v2] drm/amdgpu: add vm fault information to devcoredump

[Sunil Khatri <sunil.khatri@xxxxxxx>]

Add page fault information to the devcoredump.

Output of devcoredump:
**** AMDGPU Device Coredump ****
version: 1
kernel: 6.7.0-amd-staging-drm-next
module: amdgpu
time: 29.725011811
process_name: soft_recovery_p PID: 1720

Ring timed out details
IP Type: 0 Ring Name: gfx_0.0.0

[gfxhub] Page fault observed
Faulty page starting at address 0x0000000000000000
Protection fault status register:0x301031

VRAM is lost due to GPU reset!

Signed-off-by: Sunil Khatri <sunil.khatri@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c | 14 +++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
index 147100c27c2d..1c1dc3162a14 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
@@ -203,8 +203,19 @@ amdgpu_devcoredump_read(char *buffer, loff_t offset, size_t count,
 			   coredump->ring->name);
 	}
 
+	if (coredump->fault_info.status) {
+		struct amdgpu_vm_fault_info *fault_info = &coredump->fault_info;
+
+		drm_printf(&p, "\n[%s] Page fault observed\n",
+			   fault_info->vmhub ? "mmhub" : "gfxhub");
+		drm_printf(&p, "Faulty page starting at address 0x%016llx\n",
+			   fault_info->addr);
+		drm_printf(&p, "Protection fault status register:0x%x\n",
+			   fault_info->status);
+	}
+
 	if (coredump->reset_vram_lost)
-		drm_printf(&p, "VRAM is lost due to GPU reset!\n");
+		drm_printf(&p, "\nVRAM is lost due to GPU reset!\n");
 	if (coredump->adev->reset_info.num_regs) {
 		drm_printf(&p, "AMDGPU register dumps:\nOffset:     Value:\n");
 
@@ -253,6 +264,7 @@ void amdgpu_coredump(struct amdgpu_device *adev, bool vram_lost,
 	if (job) {
 		s_job = &job->base;
 		coredump->ring = to_amdgpu_ring(s_job->sched);
+		coredump->fault_info = job->vm->fault_info;
 	}
 
 	coredump->adev = adev;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
index 60522963aaca..3197955264f9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
@@ -98,6 +98,7 @@ struct amdgpu_coredump_info {
 	struct timespec64               reset_time;
 	bool                            reset_vram_lost;
 	struct amdgpu_ring			*ring;
+	struct amdgpu_vm_fault_info	fault_info;
 };
 #endif
 
-- 
2.34.1