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

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

Fixes: 438b39ac74e2 ("drm/amdkfd: pause autosuspend when creating pdd")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3849
Signed-off-by: Jesse Zhang <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdkfd/kfd_debug.c

···
 {
 	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);