In order to test drivers that don't have support for proper buffer
objects, add a wrapper for creating dumb buffer objects that will be
called from the lib code for those subtests that don't need to care.

Signed-off-by: Tomeu Vizoso <tomeu.viz...@collabora.com>
---

Changes in v2:
- Rename dumb_create to kmstest_dumb_create as suggested by Daniel
  Vetter.

 lib/igt_kms.c        | 36 ++++++++++++++++++++++++++++++++++++
 lib/igt_kms.h        |  3 +++
 tests/drm_read.c     | 16 +---------------
 tests/gem_exec_blt.c | 18 +-----------------
 4 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 5a61def98290..ee375bffc5e2 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -309,6 +309,42 @@ uint32_t kmstest_find_crtc_for_connector(int fd, 
drmModeRes *res,
        igt_assert(false);
 }
 
+/**
+ * kmstest_dumb_create:
+ * @fd: open drm file descriptor
+ * @width: width of the buffer in pixels
+ * @height: height of the buffer in pixels
+ * @bpp: bytes per pixel of the buffer
+ *
+ * This wraps the CREATE_DUMB ioctl, which allocates a new dumb buffer object
+ * for the specified dimensions.
+ *
+ * Returns: The file-private handle of the created buffer object
+ */
+uint32_t kmstest_dumb_create(int fd, int width, int height, int bpp,
+                            unsigned *stride, unsigned *size)
+{
+       struct drm_mode_create_dumb create;
+
+       memset(&create, 0, sizeof(create));
+       create.width = width;
+       create.height = height;
+       create.bpp = bpp;
+
+       create.handle = 0;
+       do_ioctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
+       igt_assert(create.handle);
+       igt_assert(create.size >= width * height * bpp / 8);
+
+       if (stride)
+               *stride = create.pitch;
+
+       if (size)
+               *size = create.size;
+
+       return create.handle;
+}
+
 /*
  * Returns: the previous mode, or KD_GRAPHICS if no /dev/tty0 was
  * found and nothing was done.
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 5744ed005c23..45df8b556daf 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -155,6 +155,9 @@ uint32_t kmstest_find_crtc_for_connector(int fd, drmModeRes 
*res,
                                         drmModeConnector *connector,
                                         uint32_t crtc_blacklist_idx_mask);
 
+uint32_t kmstest_dumb_create(int fd, int width, int height, int bpp,
+                            unsigned *stride, unsigned *size);
+
 /*
  * A small modeset API
  */
diff --git a/tests/drm_read.c b/tests/drm_read.c
index faa3df862ea6..d69c7a0a903d 100644
--- a/tests/drm_read.c
+++ b/tests/drm_read.c
@@ -120,20 +120,6 @@ static void test_invalid_buffer(int in)
        teardown(fd);
 }
 
-static uint32_t dumb_create(int fd)
-{
-       struct drm_mode_create_dumb arg;
-
-       arg.bpp = 32;
-       arg.width = 32;
-       arg.height = 32;
-
-       do_ioctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
-       igt_assert(arg.size >= 4096);
-
-       return arg.handle;
-}
-
 static void test_fault_buffer(int in)
 {
        int fd = setup(in, 0);
@@ -141,7 +127,7 @@ static void test_fault_buffer(int in)
        char *buf;
 
        memset(&arg, 0, sizeof(arg));
-       arg.handle = dumb_create(fd);
+       arg.handle = kmstest_dumb_create(fd, 32, 32, 32, NULL, NULL);
 
        do_ioctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &arg);
 
diff --git a/tests/gem_exec_blt.c b/tests/gem_exec_blt.c
index 74f5c2ba87ad..677708de850c 100644
--- a/tests/gem_exec_blt.c
+++ b/tests/gem_exec_blt.c
@@ -170,22 +170,6 @@ static const char *bytes_per_sec(char *buf, double v)
        return buf;
 }
 
-static uint32_t dumb_create(int fd)
-{
-       struct drm_mode_create_dumb arg;
-       int ret;
-
-       arg.bpp = 32;
-       arg.width = 32;
-       arg.height = 32;
-
-       ret = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
-       igt_assert_eq(ret, 0);
-       igt_assert(arg.size >= 4096);
-
-       return arg.handle;
-}
-
 static int dcmp(const void *A, const void *B)
 {
        const double *a = A, *b = B;
@@ -209,7 +193,7 @@ static void run(int object_size, bool dumb)
 
        fd = drm_open_driver(DRIVER_INTEL);
        if (dumb)
-               handle = dumb_create(fd);
+               handle = kmstest_dumb_create(fd, 32, 32, 32, NULL, NULL);
        else
                handle = gem_create(fd, 4096);
 
-- 
2.5.0

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