[PATCH] drm/amdkfd: fixed page fault when enable MES shader debugger

[Jesse.zhang@amd.com]

Initialize the process context address before setting the shader debugger.

[  260.781212] amdgpu 0000:03:00.0: amdgpu: [gfxhub] page fault (src_id:0 ring:32 vmid:0 pasid:0)
[  260.781236] amdgpu 0000:03:00.0: amdgpu:   in page starting at address 0x0000000000000000 from client 10
[  260.781255] amdgpu 0000:03:00.0: amdgpu: GCVM_L2_PROTECTION_FAULT_STATUS:0x00040A40
[  260.781270] amdgpu 0000:03:00.0: amdgpu:      Faulty UTCL2 client ID: CPC (0x5)
[  260.781284] amdgpu 0000:03:00.0: amdgpu:      MORE_FAULTS: 0x0
[  260.781296] amdgpu 0000:03:00.0: amdgpu:      WALKER_ERROR: 0x0
[  260.781308] amdgpu 0000:03:00.0: amdgpu:      PERMISSION_FAULTS: 0x4
[  260.781320] amdgpu 0000:03:00.0: amdgpu:      MAPPING_ERROR: 0x0
[  260.781332] amdgpu 0000:03:00.0: amdgpu:      RW: 0x1
[  260.782017] amdgpu 0000:03:00.0: amdgpu: [gfxhub] page fault (src_id:0 ring:32 vmid:0 pasid:0)
[  260.782039] amdgpu 0000:03:00.0: amdgpu:   in page starting at address 0x0000000000000000 from client 10
[  260.782058] amdgpu 0000:03:00.0: amdgpu: GCVM_L2_PROTECTION_FAULT_STATUS:0x00040A41
[  260.782073] amdgpu 0000:03:00.0: amdgpu:      Faulty UTCL2 client ID: CPC (0x5)
[  260.782087] amdgpu 0000:03:00.0: amdgpu:      MORE_FAULTS: 0x1
[  260.782098] amdgpu 0000:03:00.0: amdgpu:      WALKER_ERROR: 0x0
[  260.782110] amdgpu 0000:03:00.0: amdgpu:      PERMISSION_FAULTS: 0x4
[  260.782122] amdgpu 0000:03:00.0: amdgpu:      MAPPING_ERROR: 0x0
[  260.782137] amdgpu 0000:03:00.0: amdgpu:      RW: 0x1
[  260.782155] amdgpu 0000:03:00.0: amdgpu: [gfxhub] page fault (src_id:0 ring:32 vmid:0 pasid:0)
[  260.782166] amdgpu 0000:03:00.0: amdgpu:   in page starting at address 0x0000000000000000 from client 10

Signed-off-by: Jesse Zhang <jesse.zhang at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_debug.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
index 312dfa84f29f..a8abc3091801 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_debug.c
@@ -350,10 +350,27 @@ int kfd_dbg_set_mes_debug_mode(struct kfd_process_device *pdd, bool sq_trap_en)
 {
 	uint32_t spi_dbg_cntl = pdd->spi_dbg_override | pdd->spi_dbg_launch_mode;
 	uint32_t flags = pdd->process->dbg_flags;
+	struct amdgpu_device *adev = pdd->dev->adev;
+	int r;
 
 	if (!kfd_dbg_is_per_vmid_supported(pdd->dev))
 		return 0;
 
+	if (!pdd->proc_ctx_cpu_ptr) {
+			r = amdgpu_amdkfd_alloc_gtt_mem(adev,
+				AMDGPU_MES_PROC_CTX_SIZE,
+				&pdd->proc_ctx_bo,
+				&pdd->proc_ctx_gpu_addr,
+				&pdd->proc_ctx_cpu_ptr,
+				false);
+		if (r) {
+			dev_err(adev->dev,
+			"failed to allocate process context bo\n");
+			return r;
+		}
+		memset(pdd->proc_ctx_cpu_ptr, 0, AMDGPU_MES_PROC_CTX_SIZE);
+	}
+
 	return amdgpu_mes_set_shader_debugger(pdd->dev->adev, pdd->proc_ctx_gpu_addr, spi_dbg_cntl,
 						pdd->watch_points, flags, sq_trap_en);
 }
-- 
2.25.1