[PATCH v2 2/2] drm/amdgpu: add reset register trace function on GPU reset

[Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>]

Dump the list of register values to trace event on GPU reset.

Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 18 +++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h  | 19 +++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 1e651b959141..d52d120e7a6b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4534,6 +4534,20 @@ int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
 	return r;
 }
 
+static int amdgpu_reset_reg_dumps(struct amdgpu_device *adev)
+{
+	int i;
+	uint32_t reg_value[AMDGPU_RESET_DUMP_REGS_MAX];
+
+	for (i = 0; i < adev->n_regs; i++)
+		reg_value[i] = RREG32(adev->reset_dump_reg_list[i]);
+
+	if (adev->n_regs)
+		trace_amdgpu_reset_reg_dumps(adev->reset_dump_reg_list, reg_value, adev->n_regs);
+
+	return 0;
+}
+
 int amdgpu_do_asic_reset(struct list_head *device_list_handle,
 			 struct amdgpu_reset_context *reset_context)
 {
@@ -4567,8 +4581,10 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
 				tmp_adev->gmc.xgmi.pending_reset = false;
 				if (!queue_work(system_unbound_wq, &tmp_adev->xgmi_reset_work))
 					r = -EALREADY;
-			} else
+			} else {
+				amdgpu_reset_reg_dumps(tmp_adev);
 				r = amdgpu_asic_reset(tmp_adev);
+			}
 
 			if (r) {
 				dev_err(tmp_adev->dev, "ASIC reset failed with error, %d for drm dev, %s",
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
index d855cb53c7e0..781fd0ec2c9d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
@@ -537,6 +537,25 @@ TRACE_EVENT(amdgpu_ib_pipe_sync,
 		      __entry->seqno)
 );
 
+TRACE_EVENT(amdgpu_reset_reg_dumps,
+	    TP_PROTO(uint32_t *address, uint32_t *value, int length),
+	    TP_ARGS(address, value, length),
+	    TP_STRUCT__entry(
+			     __array(uint32_t, address, AMDGPU_RESET_DUMP_REGS_MAX)
+			     __array(uint32_t, value, AMDGPU_RESET_DUMP_REGS_MAX)
+			     __field(int, len)
+			     ),
+	    TP_fast_assign(
+			   memcpy(__entry->address, address, AMDGPU_RESET_DUMP_REGS_MAX);
+			   memcpy(__entry->value,  value, AMDGPU_RESET_DUMP_REGS_MAX);
+			   __entry->len = length;
+			   ),
+	    TP_printk("amdgpu register dump offset: %s value: %s",
+		      __print_array(__entry->address, __entry->len, 4),
+		      __print_array(__entry->value, __entry->len, 4)
+		     )
+);
+
 #undef AMDGPU_JOB_GET_TIMELINE_NAME
 #endif
 
-- 
2.25.1