[Intel-gfx] [PATCH 3/3] drm/i915: Add debugfs file to dump entire logical context

[armin.c.reese at intel.com]

From: Armin Reese <armin.c.reese at intel.com>

The new 'i915_context_dump' file generates a hex dump of the
entire logical context DRM object.  It is useful for
validating the contents of the default context set up by
the golden state batch buffer.

Signed-off-by: Armin Reese <armin.c.reese at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 64 +++++++++++++++++++++++++++++++++++--
 1 file changed, 62 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 063b448..345fc23 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -46,6 +46,11 @@ enum {
 	PINNED_LIST,
 };
 
+enum {
+	NO_CONTEXT_DUMP,
+	CONTEXT_DUMP,
+};
+
 static const char *yesno(int v)
 {
 	return v ? "yes" : "no";
@@ -120,6 +125,51 @@ static inline const char *get_global_flag(struct drm_i915_gem_object *obj)
 }
 
 static void
+dump_32_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
+{
+	struct page *page;
+	size_t size; /* In bytes */
+	size_t start_dword, end_dword, end_row_dword; /* In uint32_t offsets */
+	int i, num_pages;
+	uint32_t *obj_ptr;
+
+	if (i915_gem_object_get_pages(obj))
+		return;
+
+	size = obj->base.size; /* In bytes */
+	num_pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+
+	for (i = 0; i < num_pages; i++) {
+		page = i915_gem_object_get_page(obj, i);
+		drm_clflush_pages(&page, 1);
+
+		start_dword = (i * PAGE_SIZE) / sizeof(uint32_t);
+		end_dword = start_dword + (PAGE_SIZE / sizeof(uint32_t));
+		if ((end_dword * sizeof(uint32_t)) > size)
+			end_dword = size / sizeof(uint32_t);
+
+		obj_ptr = (uint32_t *)kmap_atomic(page);
+
+		while (start_dword < end_dword) {
+			end_row_dword = start_dword + 8;
+			if (end_row_dword > end_dword)
+				end_row_dword = end_dword;
+			seq_printf(m, "0x%08lx:  ",
+					start_dword * sizeof(uint32_t));
+			while (start_dword < end_row_dword) {
+				seq_printf(m, "0x%08x ",
+					   *(obj_ptr +
+					   (start_dword & (PAGE_SIZE - 1))));
+				start_dword++;
+			}
+			seq_puts(m, "\n");
+		}
+
+		kunmap_atomic(obj_ptr);
+	}
+}
+
+static void
 describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
 {
 	struct i915_vma *vma;
@@ -1709,9 +1759,10 @@ static void describe_ctx_ringbuf(struct seq_file *m,
 		   ringbuf->last_retired_head);
 }
 
-static int i915_context_status(struct seq_file *m, void *unused)
+static int i915_context_status(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = m->private;
+	uintptr_t dump_flag = (uintptr_t) node->info_ent->data;
 	struct drm_device *dev = node->minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_engine_cs *ring;
@@ -1758,8 +1809,16 @@ static int i915_context_status(struct seq_file *m, void *unused)
 				seq_printf(m, "%s: ", ring->name);
 				if (ctx_obj)
 					describe_obj(m, ctx_obj);
+
 				if (ringbuf)
 					describe_ctx_ringbuf(m, ringbuf);
+
+				if (ctx_obj &&
+					(dump_flag == CONTEXT_DUMP)) {
+					seq_puts(m, "\nContext Dump:\n");
+					dump_32_obj(m, ctx_obj);
+				}
+
 				seq_putc(m, '\n');
 			}
 		} else {
@@ -4170,7 +4229,8 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_sr_status", i915_sr_status, 0},
 	{"i915_opregion", i915_opregion, 0},
 	{"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
-	{"i915_context_status", i915_context_status, 0},
+	{"i915_context_status", i915_context_status, 0, (void *)NO_CONTEXT_DUMP},
+	{"i915_context_dump", i915_context_status, 0, (void *)CONTEXT_DUMP},
 	{"i915_dump_lrc", i915_dump_lrc, 0},
 	{"i915_execlists", i915_execlists, 0},
 	{"i915_gen6_forcewake_count", i915_gen6_forcewake_count_info, 0},
-- 
1.9.1