On Thu, Sep 06, 2018 at 09:28:50AM +0200, Gerd Hoffmann wrote:
Drivers must set the quirk_addfb_prefer_host_byte_order quirk to make the drm_mode_addfb() compat code work correctly on bigendian machines.
If they don't they interpret pixel_format values incorrectly for bug compatibility, which in turn implies the ADDFB2 ioctl does not work correctly then. So block it to make userspace fallback to ADDFB.
Signed-off-by: Gerd Hoffmann kraxel@redhat.com
drivers/gpu/drm/drm_ioctl.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index ea10e9a26a..08e48bda23 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -469,6 +469,29 @@ static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) return 0; }
+static int drm_mode_addfb2_check(struct drm_device *dev,
void *data, struct drm_file *file_priv)+{ +#ifdef __BIG_ENDIAN
- if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
/** Drivers must set the* quirk_addfb_prefer_host_byte_order quirk to make* the drm_mode_addfb() compat code work correctly on* bigendian machines.** If they don't they interpret pixel_format values* incorrectly for bug compatibility, which in turn* implies the ADDFB2 ioctl does not work correctly* then. So block it to make userspace fallback to* ADDFB.*/
DRM_DEBUG_KMS would be good here I think, just to help userspace people figure out why they got an -EINVAL.
return -EINVAL;- }
+#endif
- return drm_mode_addfb2(dev, data, file_priv);
I think it'd be better if we have all the addfb code in drm_framebuffer.c. So leave the function name, and extract the common code into __drm_mode_addfb2 helper.
With these two nits addressed:
Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch
+}
/*
- Get version information
@@ -645,7 +668,7 @@ static const struct drm_ioctl_desc drm_ioctls[] = { DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, DRM_UNLOCKED),
- DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_UNLOCKED),
- DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_check, DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_UNLOCKED), DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_UNLOCKED),
-- 2.9.3
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