drm/i915: Add dynamic page trace events

Traces for page directories and tables allocation and map.

v2: Removed references to teardown.
v3: bitmap_scnprintf has been deprecated.
v4: Replace bitmap_scnprintf with scnprintf correctly, and get right
range lengths. (Mika)

Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem.c

@@ -3512,6 +3512,8 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
 
 	/*  allocate before insert / bind */
 	if (vma->vm->allocate_va_range) {
+		trace_i915_va_alloc(vma->vm, vma->node.start, vma->node.size,
+				VM_TO_TRACE_NAME(vma->vm));
 		ret = vma->vm->allocate_va_range(vma->vm,
 						vma->node.start,
 						vma->node.size);

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -1225,6 +1225,7 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
 
 		ppgtt->pd.page_table[pde] = pt;
 		set_bit(pde, new_page_tables);
+		trace_i915_page_table_entry_alloc(vm, pde, start, GEN6_PDE_SHIFT);
 	}
 
 	start = start_save;
@@ -1240,6 +1241,10 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
 		if (test_and_clear_bit(pde, new_page_tables))
 			gen6_write_pde(&ppgtt->pd, pde, pt);
 
+		trace_i915_page_table_entry_map(vm, pde, pt,
+					 gen6_pte_index(start),
+					 gen6_pte_count(start, length),
+					 GEN6_PTES);
 		bitmap_or(pt->used_ptes, tmp_bitmap, pt->used_ptes,
 				GEN6_PTES);
 	}

drivers/gpu/drm/i915/i915_trace.h

@@ -156,6 +156,105 @@ TRACE_EVENT(i915_vma_unbind,
 		      __entry->obj, __entry->offset, __entry->size, __entry->vm)
 );
 
+#define VM_TO_TRACE_NAME(vm) \
+	(i915_is_ggtt(vm) ? "G" : \
+		      "P")
+
+DECLARE_EVENT_CLASS(i915_va,
+	TP_PROTO(struct i915_address_space *vm, u64 start, u64 length, const char *name),
+	TP_ARGS(vm, start, length, name),
+
+	TP_STRUCT__entry(
+		__field(struct i915_address_space *, vm)
+		__field(u64, start)
+		__field(u64, end)
+		__string(name, name)
+	),
+
+	TP_fast_assign(
+		__entry->vm = vm;
+		__entry->start = start;
+		__entry->end = start + length - 1;
+		__assign_str(name, name);
+	),
+
+	TP_printk("vm=%p (%s), 0x%llx-0x%llx",
+		  __entry->vm, __get_str(name),  __entry->start, __entry->end)
+);
+
+DEFINE_EVENT(i915_va, i915_va_alloc,
+	     TP_PROTO(struct i915_address_space *vm, u64 start, u64 length, const char *name),
+	     TP_ARGS(vm, start, length, name)
+);
+
+DECLARE_EVENT_CLASS(i915_page_table_entry,
+	TP_PROTO(struct i915_address_space *vm, u32 pde, u64 start, u64 pde_shift),
+	TP_ARGS(vm, pde, start, pde_shift),
+
+	TP_STRUCT__entry(
+		__field(struct i915_address_space *, vm)
+		__field(u32, pde)
+		__field(u64, start)
+		__field(u64, end)
+	),
+
+	TP_fast_assign(
+		__entry->vm = vm;
+		__entry->pde = pde;
+		__entry->start = start;
+		__entry->end = ((start + (1ULL << pde_shift)) & ~((1ULL << pde_shift)-1)) - 1;
+	),
+
+	TP_printk("vm=%p, pde=%d (0x%llx-0x%llx)",
+		  __entry->vm, __entry->pde, __entry->start, __entry->end)
+);
+
+DEFINE_EVENT(i915_page_table_entry, i915_page_table_entry_alloc,
+	     TP_PROTO(struct i915_address_space *vm, u32 pde, u64 start, u64 pde_shift),
+	     TP_ARGS(vm, pde, start, pde_shift)
+);
+
+/* Avoid extra math because we only support two sizes. The format is defined by
+ * bitmap_scnprintf. Each 32 bits is 8 HEX digits followed by comma */
+#define TRACE_PT_SIZE(bits) \
+	((((bits) == 1024) ? 288 : 144) + 1)
+
+DECLARE_EVENT_CLASS(i915_page_table_entry_update,
+	TP_PROTO(struct i915_address_space *vm, u32 pde,
+		 struct i915_page_table_entry *pt, u32 first, u32 count, u32 bits),
+	TP_ARGS(vm, pde, pt, first, count, bits),
+
+	TP_STRUCT__entry(
+		__field(struct i915_address_space *, vm)
+		__field(u32, pde)
+		__field(u32, first)
+		__field(u32, last)
+		__dynamic_array(char, cur_ptes, TRACE_PT_SIZE(bits))
+	),
+
+	TP_fast_assign(
+		__entry->vm = vm;
+		__entry->pde = pde;
+		__entry->first = first;
+		__entry->last = first + count - 1;
+		scnprintf(__get_str(cur_ptes),
+			  TRACE_PT_SIZE(bits),
+			  "%*pb",
+			  bits,
+			  pt->used_ptes);
+	),
+
+	TP_printk("vm=%p, pde=%d, updating %u:%u\t%s",
+		  __entry->vm, __entry->pde, __entry->last, __entry->first,
+		  __get_str(cur_ptes))
+);
+
+DEFINE_EVENT(i915_page_table_entry_update, i915_page_table_entry_map,
+	TP_PROTO(struct i915_address_space *vm, u32 pde,
+		 struct i915_page_table_entry *pt, u32 first, u32 count, u32 bits),
+	TP_ARGS(vm, pde, pt, first, count, bits)
+);
+
 TRACE_EVENT(i915_gem_object_change_domain,
 	    TP_PROTO(struct drm_i915_gem_object *obj, u32 old_read, u32 old_write),
 	    TP_ARGS(obj, old_read, old_write),