drm/i915/gvt: refine trace_render_mmio

Refine trace_render_mmio to show the vm id before and after vgpu switch,
tag host id as '0', this patch will be used in the future patch for refine
mocs switch policy.
Signed-off-by: Weinan Li <weinan.z.li@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/mmio_context.c

@@ -304,7 +304,7 @@ static void switch_mmio_to_vgpu(struct intel_vgpu *vgpu, int ring_id)
 
 		I915_WRITE_FW(mmio->reg, v);
 
-		trace_render_mmio(vgpu->id, "load",
+		trace_render_mmio(0, vgpu->id, "switch",
 				  i915_mmio_reg_offset(mmio->reg),
 				  mmio->value, v);
 	}
@@ -340,7 +340,7 @@ static void switch_mmio_to_host(struct intel_vgpu *vgpu, int ring_id)
 
 		I915_WRITE_FW(mmio->reg, v);
 
-		trace_render_mmio(vgpu->id, "restore",
+		trace_render_mmio(vgpu->id, 0, "switch",
 				  i915_mmio_reg_offset(mmio->reg),
 				  mmio->value, v);
 	}

drivers/gpu/drm/i915/gvt/trace.h

@@ -330,13 +330,14 @@ TRACE_EVENT(inject_msi,
 );
 
 TRACE_EVENT(render_mmio,
-	TP_PROTO(int id, char *action, unsigned int reg,
+	TP_PROTO(int old_id, int new_id, char *action, unsigned int reg,
 		 unsigned int old_val, unsigned int new_val),
 
-	TP_ARGS(id, action, reg, new_val, old_val),
+	TP_ARGS(old_id, new_id, action, reg, new_val, old_val),
 
 	TP_STRUCT__entry(
-		__field(int, id)
+		__field(int, old_id)
+		__field(int, new_id)
 		__array(char, buf, GVT_TEMP_STR_LEN)
 		__field(unsigned int, reg)
 		__field(unsigned int, old_val)
@@ -344,15 +345,17 @@ TRACE_EVENT(render_mmio,
 	),
 
 	TP_fast_assign(
-		__entry->id = id;
+		__entry->old_id = old_id;
+		__entry->new_id = new_id;
 		snprintf(__entry->buf, GVT_TEMP_STR_LEN, "%s", action);
 		__entry->reg = reg;
 		__entry->old_val = old_val;
 		__entry->new_val = new_val;
 	),
 
-	TP_printk("VM%u %s reg %x, old %08x new %08x\n",
-		  __entry->id, __entry->buf, __entry->reg,
+	TP_printk("VM%u -> VM%u %s reg %x, old %08x new %08x\n",
+		  __entry->old_id, __entry->new_id,
+		  __entry->buf, __entry->reg,
 		  __entry->old_val, __entry->new_val)
 );