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 <[email protected]>
---
drivers/gpu/drm/drm_crtc_internal.h | 6 ++++--
drivers/gpu/drm/drm_framebuffer.c | 24 ++++++++++++++++++++++++
drivers/gpu/drm/drm_ioctl.c | 2 +-
3 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index b613227633..6719e1c8df 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -174,6 +174,8 @@ void drm_fb_release(struct drm_file *file_priv);
int drm_mode_addfb(struct drm_device *dev, struct drm_mode_fb_cmd *or,
struct drm_file *file_priv);
+int drm_mode_addfb2(struct drm_device *dev,
+ void *data, struct drm_file *file_priv);
int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
struct drm_file *file_priv);
@@ -181,8 +183,8 @@ int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
/* IOCTL */
int drm_mode_addfb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
-int drm_mode_addfb2(struct drm_device *dev,
- void *data, struct drm_file *file_priv);
+int drm_mode_addfb2_ioctl(struct drm_device *dev,
+ void *data, struct drm_file *file_priv);
int drm_mode_rmfb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
int drm_mode_getfb(struct drm_device *dev,
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index f863f8a20f..fb7528444c 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -363,6 +363,30 @@ int drm_mode_addfb2(struct drm_device *dev,
return 0;
}
+int drm_mode_addfb2_ioctl(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("addfb2 broken on bigendian");
+ return -EINVAL;
+ }
+#endif
+ return drm_mode_addfb2(dev, data, file_priv);
+}
+
struct drm_mode_rmfb_work {
struct work_struct work;
struct list_head fbs;
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index ea10e9a26a..6b4a633b42 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -645,7 +645,7 @@ 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_ioctl, 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
On Fri, Sep 07, 2018 at 09:32:13AM +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 <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
> ---
> drivers/gpu/drm/drm_crtc_internal.h | 6 ++++--
> drivers/gpu/drm/drm_framebuffer.c | 24 ++++++++++++++++++++++++
> drivers/gpu/drm/drm_ioctl.c | 2 +-
> 3 files changed, 29 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> index b613227633..6719e1c8df 100644
> --- a/drivers/gpu/drm/drm_crtc_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_internal.h
> @@ -174,6 +174,8 @@ void drm_fb_release(struct drm_file *file_priv);
>
> int drm_mode_addfb(struct drm_device *dev, struct drm_mode_fb_cmd *or,
> struct drm_file *file_priv);
> +int drm_mode_addfb2(struct drm_device *dev,
> + void *data, struct drm_file *file_priv);
> int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
> struct drm_file *file_priv);
>
> @@ -181,8 +183,8 @@ int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
> /* IOCTL */
> int drm_mode_addfb_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> -int drm_mode_addfb2(struct drm_device *dev,
> - void *data, struct drm_file *file_priv);
> +int drm_mode_addfb2_ioctl(struct drm_device *dev,
> + void *data, struct drm_file *file_priv);
> int drm_mode_rmfb_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> int drm_mode_getfb(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index f863f8a20f..fb7528444c 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -363,6 +363,30 @@ int drm_mode_addfb2(struct drm_device *dev,
> return 0;
> }
>
> +int drm_mode_addfb2_ioctl(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("addfb2 broken on bigendian");
> + return -EINVAL;
> + }
> +#endif
> + return drm_mode_addfb2(dev, data, file_priv);
> +}
> +
> struct drm_mode_rmfb_work {
> struct work_struct work;
> struct list_head fbs;
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index ea10e9a26a..6b4a633b42 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -645,7 +645,7 @@ 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_ioctl, 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
>
> _______________________________________________
> dri-devel mailing list
> [email protected]
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
Hi Gerd,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.19-rc2 next-20180906]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Gerd-Hoffmann/drm-refuse-ADDFB2-ioctl-for-broken-bigendian-drivers/20180910-142802
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 8.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=8.1.0 make.cross ARCH=xtensa
All errors (new ones prefixed by >>):
drivers/gpu//drm/drm_framebuffer.c: In function 'drm_mode_addfb2_ioctl':
>> drivers/gpu//drm/drm_framebuffer.c:359:23: error: 'struct drm_mode_config' has no member named 'quirk_addfb_prefer_host_byte_order'
if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
^
vim +359 drivers/gpu//drm/drm_framebuffer.c
354
355 int drm_mode_addfb2_ioctl(struct drm_device *dev,
356 void *data, struct drm_file *file_priv)
357 {
358 #ifdef __BIG_ENDIAN
> 359 if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
360 /*
361 * Drivers must set the
362 * quirk_addfb_prefer_host_byte_order quirk to make
363 * the drm_mode_addfb() compat code work correctly on
364 * bigendian machines.
365 *
366 * If they don't they interpret pixel_format values
367 * incorrectly for bug compatibility, which in turn
368 * implies the ADDFB2 ioctl does not work correctly
369 * then. So block it to make userspace fallback to
370 * ADDFB.
371 */
372 DRM_DEBUG_KMS("addfb2 broken on bigendian");
373 return -EINVAL;
374 }
375 #endif
376 return drm_mode_addfb2(dev, data, file_priv);
377 }
378
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation