[PATCH i-g-t 1/2] lib/igt_draw: Add support for writing onto already mmapped buffer

[Vandita Kulkarni]

Provide another draw method, for supporting drawing onto
already mmapped buffer.

Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 lib/igt_draw.c                         | 37 ++++++++++++++++++++++++--
 lib/igt_draw.h                         | 11 +++++++-
 tests/intel/kms_frontbuffer_tracking.c |  2 +-
 3 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/lib/igt_draw.c b/lib/igt_draw.c
index 2c01d7b02..cccce63ff 100644
--- a/lib/igt_draw.c
+++ b/lib/igt_draw.c
@@ -75,6 +75,7 @@ struct buf_data {
 	uint32_t handle;
 	uint32_t size;
 	uint32_t stride;
+	void *buf_ptr;
 	int width;
 	int height;
 	int bpp;
@@ -110,6 +111,8 @@ const char *igt_draw_get_method_name(enum igt_draw_method method)
 		return "blt";
 	case IGT_DRAW_RENDER:
 		return "render";
+	case IGT_DRAW_MMAP_PTR:
+		return "mmap-ptr";
 	default:
 		igt_assert(false);
 	}
@@ -541,6 +544,27 @@ static void draw_rect_mmap_wc(int fd, struct buf_data *buf, struct rect *rect,
 	igt_assert(gem_munmap(ptr, buf->size) == 0);
 }
 
+static void draw_rect_mmap_ptr(int fd, struct buf_data *buf, struct rect *rect,
+			      uint32_t tiling, uint32_t swizzle, uint32_t color)
+{
+	igt_assert(!buf->buf_ptr);
+
+	switch (tiling) {
+	case I915_TILING_NONE:
+		draw_rect_ptr_linear(buf->buf_ptr, buf->stride, rect, color, buf->bpp);
+		break;
+	case I915_TILING_X:
+	case I915_TILING_Y:
+	case I915_TILING_4:
+		draw_rect_ptr_tiled(buf->buf_ptr, buf->stride, tiling, swizzle, rect,
+				    color, buf->bpp);
+		break;
+	default:
+		igt_assert(false);
+		break;
+	}
+}
+
 static void draw_rect_pwrite_untiled(int fd, struct buf_data *buf,
 				     struct rect *rect, uint32_t color)
 {
@@ -839,6 +863,8 @@ static void draw_rect_render(int fd, struct cmd_data *cmd_data,
  * @buf_handle: the handle of the buffer where you're going to draw to
  * @buf_size: the size of the buffer
  * @buf_stride: the stride of the buffer
+ * @buf_ptr: Pointer to already mmapped buffer, to be used with IGT_DRAW_MMAP_PTR,
+	     otherwise can be left NULL.
  * @buf_width: the width of the buffer
  * @buf_height: the height of the buffer
  * @tiling: the tiling of the buffer
@@ -855,7 +881,7 @@ static void draw_rect_render(int fd, struct cmd_data *cmd_data,
  */
 void igt_draw_rect(int fd, struct buf_ops *bops, uint32_t ctx,
 		   uint32_t buf_handle, uint32_t buf_size, uint32_t buf_stride,
-		   int buf_width, int buf_height,
+		   void *buf_ptr, int buf_width, int buf_height,
 		   uint32_t tiling, enum igt_draw_method method,
 		   int rect_x, int rect_y, int rect_w, int rect_h,
 		   uint32_t color, int bpp)
@@ -870,6 +896,7 @@ void igt_draw_rect(int fd, struct buf_ops *bops, uint32_t ctx,
 		.handle = buf_handle,
 		.size = buf_size,
 		.stride = buf_stride,
+		.buf_ptr = buf_ptr,
 		.width = buf_width,
 		.height = buf_height,
 		.bpp = bpp,
@@ -907,6 +934,9 @@ void igt_draw_rect(int fd, struct buf_ops *bops, uint32_t ctx,
 	case IGT_DRAW_RENDER:
 		draw_rect_render(fd, &cmd_data, &buf, &rect, tiling, color);
 		break;
+	case IGT_DRAW_MMAP_PTR:
+		draw_rect_mmap_ptr(fd, &buf, &rect, tiling, swizzle, color);
+		break;
 	default:
 		igt_assert(false);
 		break;
@@ -935,7 +965,7 @@ void igt_draw_rect_fb(int fd, struct buf_ops *bops,
 		      int rect_w, int rect_h, uint32_t color)
 {
 	igt_draw_rect(fd, bops, ctx, fb->gem_handle, fb->size, fb->strides[0],
-		      fb->width, fb->height,
+		      fb->driver_priv, fb->width, fb->height,
 		      igt_fb_mod_to_tiling(fb->modifier), method,
 		      rect_x, rect_y, rect_w, rect_h, color,
 		      igt_drm_format_to_bpp(fb->drm_format));
@@ -971,5 +1001,8 @@ bool igt_draw_supports_method(int fd, enum igt_draw_method method)
 	if (method == IGT_DRAW_RENDER)
 		return !!igt_get_render_copyfunc(intel_get_drm_devid(fd));
 
+	if (method == IGT_DRAW_MMAP_PTR)
+		return (is_i915_device(fd) && gem_has_mappable_ggtt(fd)) || is_xe_device(fd);
+
 	return true;
 }
diff --git a/lib/igt_draw.h b/lib/igt_draw.h
index 1dec95e86..e6cce7295 100644
--- a/lib/igt_draw.h
+++ b/lib/igt_draw.h
@@ -36,6 +36,7 @@
  * @IGT_DRAW_PWRITE: draw using the pwrite ioctl.
  * @IGT_DRAW_BLT: draw using the BLT ring.
  * @IGT_DRAW_RENDER: draw using the render ring.
+ * @IGT_DRAW_MMAP_PTR: draw onto already mmapped buffer.
  * @IGT_DRAW_METHOD_COUNT: useful for iterating through everything.
  */
 enum igt_draw_method {
@@ -46,6 +47,14 @@ enum igt_draw_method {
 	IGT_DRAW_BLT,
 	IGT_DRAW_RENDER,
 	IGT_DRAW_METHOD_COUNT,
+	/*
+	 * FIXME: This enum is placed after IGT_DRAW_METHOD_COUNT in order
+	 * to avoid it being used by other tests which test all the DRAW methods
+	 * Once we add support for this draw method in all those tests keep it
+	 * outside the total count. Some examples are kms_draw_crc, kms_frontbuffer_tracking
+	 * Similarly add support in igt_draw_get_method_name and igt_draw_supports_method
+	 */
+	IGT_DRAW_MMAP_PTR,
 };
 
 const char *igt_draw_get_method_name(enum igt_draw_method method);
@@ -54,7 +63,7 @@ bool igt_draw_supports_method(int fd, enum igt_draw_method method);
 
 void igt_draw_rect(int fd, struct buf_ops *bops, uint32_t ctx,
 		   uint32_t buf_handle, uint32_t buf_size, uint32_t buf_stride,
-		   int buf_width, int buf_height,
+		   void *buf_ptr, int buf_width, int buf_height,
 		   uint32_t tiling, enum igt_draw_method method,
 		   int rect_x, int rect_y, int rect_w, int rect_h,
 		   uint32_t color, int bpp);
diff --git a/tests/intel/kms_frontbuffer_tracking.c b/tests/intel/kms_frontbuffer_tracking.c
index e45d17dd6..32cc50712 100644
--- a/tests/intel/kms_frontbuffer_tracking.c
+++ b/tests/intel/kms_frontbuffer_tracking.c
@@ -2262,7 +2262,7 @@ static void *busy_thread_func(void *data)
 {
 	while (!busy_thread.stop)
 		igt_draw_rect(drm.fd, drm.bops, 0, busy_thread.handle,
-			      busy_thread.size, busy_thread.stride,
+			      busy_thread.size, busy_thread.stride, NULL,
 			      busy_thread.width, busy_thread.height,
 			      busy_thread.tiling, IGT_DRAW_BLT, 0, 0,
 			      busy_thread.width, busy_thread.height,
-- 
2.43.2