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drm: Remove locking for legacy ioctls and DRM_UNLOCKED

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Modern DRM drivers acquire ioctl locks by themselves. Legacy ioctls
for user-space mode setting used to acquire drm_global_mutex. After
removing the ioctl entry points, also remove the locking code. The only
legacy ioctl without global locking was VBLANK_WAIT, which has been
removed as well. Hence remove the related DRM_UNLOCKED flag.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: David Airlie <airlied@gmail.com>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231122122449.11588-12-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-11-22 13:09:40 +01:00
parent 2722ac1ce1
commit 2798ffcc1d
3 changed files with 7 additions and 27 deletions
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2
drivers/gpu/drm/drm_ioc32.c
View File

@ -273,7 +273,7 @@ static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
req.request.type = req32.request.type;
req.request.sequence = req32.request.sequence;
req.request.signal = req32.request.signal;
err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, DRM_UNLOCKED);
err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, 0);
req32.reply.type = req.reply.type;
req32.reply.sequence = req.reply.sequence;

21
drivers/gpu/drm/drm_ioctl.c
View File

@ -596,7 +596,7 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED),
DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
@ -729,7 +729,7 @@ long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
{
struct drm_file *file_priv = file->private_data;
struct drm_device *dev = file_priv->minor->dev;
int retcode;
int ret;
/* Update drm_file owner if fd was passed along. */
drm_file_update_pid(file_priv);
@ -737,20 +737,11 @@ long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
if (drm_dev_is_unplugged(dev))
return -ENODEV;
retcode = drm_ioctl_permit(flags, file_priv);
if (unlikely(retcode))
return retcode;
ret = drm_ioctl_permit(flags, file_priv);
if (unlikely(ret))
return ret;
/* Enforce sane locking for modern driver ioctls. */
if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) ||
(flags & DRM_UNLOCKED))
retcode = func(dev, kdata, file_priv);
else {
mutex_lock(&drm_global_mutex);
retcode = func(dev, kdata, file_priv);
mutex_unlock(&drm_global_mutex);
}
return retcode;
return func(dev, kdata, file_priv);
}
EXPORT_SYMBOL(drm_ioctl_kernel);

11
include/drm/drm_ioctl.h
View File

@ -109,17 +109,6 @@ enum drm_ioctl_flags {
* This is equivalent to callers with the SYSADMIN capability.
*/
DRM_ROOT_ONLY = BIT(2),
/**
* @DRM_UNLOCKED:
*
* Whether &drm_ioctl_desc.func should be called with the DRM BKL held
* or not. Enforced as the default for all modern drivers, hence there
* should never be a need to set this flag.
*
* Do not use anywhere else than for the VBLANK_WAIT IOCTL, which is the
* only legacy IOCTL which needs this.
*/
DRM_UNLOCKED = BIT(4),
/**
* @DRM_RENDER_ALLOW:
*