2018-01-30 15:58 GMT+01:00 Laurent Pinchart laurent.pinchart@ideasonboard.com:
Hi Philippe,
Thank you for the patch.
On Tuesday, 30 January 2018 12:42:00 EET Philippe Cornu wrote:
To optimize data transfers, align pitch on 128 bytes & height on 4 bytes. This optimization is not applicable on hw without MMU.
Signed-off-by: Yannick Fertre yannick.fertre@st.com Signed-off-by: Vincent Abriou vincent.abriou@st.com Signed-off-by: Philippe Cornu philippe.cornu@st.com
Changes in v2: Rename stm_dumb_create() to stm_gem_cma_dumb_create() and move CONFIG_MMU inside the function following comments from Benjamin Gaignard.
drivers/gpu/drm/stm/drv.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c index 8fe954c27fba..8bc7e8418b8d 100644 --- a/drivers/gpu/drm/stm/drv.c +++ b/drivers/gpu/drm/stm/drv.c @@ -31,6 +31,24 @@ static const struct drm_mode_config_funcs drv_mode_config_funcs = { .atomic_commit = drm_atomic_helper_commit, };
+static int stm_gem_cma_dumb_create(struct drm_file *file,
struct drm_device *dev,struct drm_mode_create_dumb *args)+{ +#ifdef CONFIG_MMU
unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);/** in order to optimize data transfer, pitch is aligned on* 128 bytes, height is aligned on 4 bytes*/args->pitch = roundup(min_pitch, 128);args->height = roundup(args->height, 4);+#endif
return drm_gem_cma_dumb_create_internal(file, dev, args);In the !CONFIG_MMU case you now bypass the pitch and size calculations performed by drm_gem_cma_dumb_create(), allowing userspace to allocate arbitrarily large buffers. Is that intentional ?
My bad, I will send a fix
+}
DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
static struct drm_driver drv_driver = { @@ -44,7 +62,7 @@ static struct drm_driver drv_driver = { .minor = 0, .patchlevel = 0, .fops = &drv_driver_fops,
.dumb_create = drm_gem_cma_dumb_create,
.dumb_create = stm_gem_cma_dumb_create, .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_free_object_unlocked = drm_gem_cma_free_object,-- Regards,
Laurent Pinchart