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drm: Remove drm_modeset_(un)lock_crtc 

The last user, the cursor ioctl, can just open-code this too. We
simply have to move the acquire ctx dance from the universal function
up into the top-level ioctl handler.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-3-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-04-03 10:32:51 +02:00
parent 5f27502655
commit b95ff0319a
4 changed files with 24 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/drm_crtc_internal.h
View File

@ -61,9 +61,6 @@ int drm_mode_getresources(struct drm_device *dev,
void *data, struct drm_file *file_priv);
/* drm_modeset_lock.c */
void drm_modeset_lock_crtc(struct drm_crtc *crtc,
struct drm_plane *plane);
/* drm_dumb_buffers.c */
/* IOCTLs */
int drm_mode_create_dumb_ioctl(struct drm_device *dev,

67
drivers/gpu/drm/drm_modeset_lock.c
View File

@ -148,51 +148,6 @@ void drm_modeset_unlock_all(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_modeset_unlock_all);
void drm_modeset_lock_crtc(struct drm_crtc *crtc,
struct drm_plane *plane)
{
struct drm_modeset_acquire_ctx *ctx;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (WARN_ON(!ctx))
return;
drm_modeset_acquire_init(ctx, 0);
retry:
ret = drm_modeset_lock(&crtc->mutex, ctx);
if (ret)
goto fail;
if (plane) {
ret = drm_modeset_lock(&plane->mutex, ctx);
if (ret)
goto fail;
if (plane->crtc) {
ret = drm_modeset_lock(&plane->crtc->mutex, ctx);
if (ret)
goto fail;
}
}
WARN_ON(crtc->acquire_ctx);
/* now we hold the locks, so now that it is safe, stash the
* ctx for drm_modeset_unlock_crtc():
*/
crtc->acquire_ctx = ctx;
return;
fail:
if (ret == -EDEADLK) {
drm_modeset_backoff(ctx);
goto retry;
}
}
/**
* drm_modeset_legacy_acquire_ctx - find acquire ctx for legacy ioctls
* @crtc: drm crtc
@ -214,28 +169,6 @@ drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc)
}
EXPORT_SYMBOL(drm_modeset_legacy_acquire_ctx);
/**
* drm_modeset_unlock_crtc - drop crtc lock
* @crtc: drm crtc
*
* This drops the crtc lock acquire with drm_modeset_lock_crtc() and all other
* locks acquired through the hidden context.
*/
void drm_modeset_unlock_crtc(struct drm_crtc *crtc)
{
struct drm_modeset_acquire_ctx *ctx = crtc->acquire_ctx;
if (WARN_ON(!ctx))
return;
crtc->acquire_ctx = NULL;
drm_modeset_drop_locks(ctx);
drm_modeset_acquire_fini(ctx);
kfree(ctx);
}
EXPORT_SYMBOL(drm_modeset_unlock_crtc);
/**
* drm_warn_on_modeset_not_all_locked - check that all modeset locks are locked
* @dev: device

49
drivers/gpu/drm/drm_plane.c
View File

@ -620,7 +620,8 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
static int drm_mode_cursor_universal(struct drm_crtc *crtc,
struct drm_mode_cursor2 *req,
struct drm_file *file_priv)
struct drm_file *file_priv,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_device *dev = crtc->dev;
struct drm_framebuffer *fb = NULL;
@ -634,21 +635,11 @@ static int drm_mode_cursor_universal(struct drm_crtc *crtc,
int32_t crtc_x, crtc_y;
uint32_t crtc_w = 0, crtc_h = 0;
uint32_t src_w = 0, src_h = 0;
struct drm_modeset_acquire_ctx ctx;
int ret = 0;
BUG_ON(!crtc->cursor);
WARN_ON(crtc->cursor->crtc != crtc && crtc->cursor->crtc != NULL);
drm_modeset_acquire_init(&ctx, 0);
retry:
ret = drm_modeset_lock(&crtc->mutex, &ctx);
if (ret)
goto fail;
ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
if (ret)
goto fail;
/*
* Obtain fb we'll be using (either new or existing) and take an extra
* reference to it if fb != null. setplane will take care of dropping
@ -693,7 +684,7 @@ retry:
*/
ret = __setplane_internal(crtc->cursor, crtc, fb,
crtc_x, crtc_y, crtc_w, crtc_h,
0, 0, src_w, src_h, &ctx);
0, 0, src_w, src_h, ctx);
/* Update successful; save new cursor position, if necessary */
if (ret == 0 && req->flags & DRM_MODE_CURSOR_MOVE) {
@ -701,15 +692,6 @@ retry:
crtc->cursor_y = req->y;
}
fail:
if (ret == -EDEADLK) {
drm_modeset_backoff(&ctx);
goto retry;
}
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
}
@ -718,6 +700,7 @@ static int drm_mode_cursor_common(struct drm_device *dev,
struct drm_file *file_priv)
{
struct drm_crtc *crtc;
struct drm_modeset_acquire_ctx ctx;
int ret = 0;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
@ -732,14 +715,24 @@ static int drm_mode_cursor_common(struct drm_device *dev,
return -ENOENT;
}
drm_modeset_acquire_init(&ctx, 0);
retry:
ret = drm_modeset_lock(&crtc->mutex, &ctx);
if (ret)
goto out;
ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
if (ret)
goto out;
/*
* If this crtc has a universal cursor plane, call that plane's update
* handler rather than using legacy cursor handlers.
*/
if (crtc->cursor)
return drm_mode_cursor_universal(crtc, req, file_priv);
if (crtc->cursor) {
ret = drm_mode_cursor_universal(crtc, req, file_priv, &ctx);
goto out;
}
drm_modeset_lock_crtc(crtc, crtc->cursor);
if (req->flags & DRM_MODE_CURSOR_BO) {
if (!crtc->funcs->cursor_set && !crtc->funcs->cursor_set2) {
ret = -ENXIO;
@ -763,7 +756,13 @@ static int drm_mode_cursor_common(struct drm_device *dev,
}
}
out:
drm_modeset_unlock_crtc(crtc);
if (ret == -EDEADLK) {
drm_modeset_backoff(&ctx);
goto retry;
}
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;

1
include/drm/drm_modeset_lock.h
View File

@ -121,7 +121,6 @@ struct drm_plane;
void drm_modeset_lock_all(struct drm_device *dev);
void drm_modeset_unlock_all(struct drm_device *dev);
void drm_modeset_unlock_crtc(struct drm_crtc *crtc);
void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
struct drm_modeset_acquire_ctx *
drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc);