From 2dd500f1870e3d852488c9b30c4ecec91c6e2eea Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Mon, 11 Jan 2016 22:40:56 +0100 Subject: [PATCH] drm: Add functions to setup/tear down drm_events. An attempt at not spreading out the file_priv->event_space stuff out quite so far and wide. And I think fixes something in ipp_get_event() that is broken (or if they are doing something more weird/subtle, then breaks it in a fun way). Based upon a patch from Rob Clark, rebased and polished. v2: Spelling fixes (Alex). Cc: Alex Deucher Acked-by: Daniel Stone Reviewed-by: Alex Deucher Cc: Rob Clark Link: http://patchwork.freedesktop.org/patch/msgid/1452548477-15905-3-git-send-email-daniel.vetter@ffwll.ch Reviewed-by: Laurent Pinchart Signed-off-by: Daniel Vetter --- drivers/gpu/drm/drm_atomic.c | 44 ++++++----------------- drivers/gpu/drm/drm_crtc.c | 36 ++++++------------- drivers/gpu/drm/drm_fops.c | 67 ++++++++++++++++++++++++++++++++++++ include/drm/drmP.h | 7 +++- 4 files changed, 94 insertions(+), 60 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 3f74193885f1..8fb469c4e4b8 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1347,44 +1347,23 @@ static struct drm_pending_vblank_event *create_vblank_event( struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data) { struct drm_pending_vblank_event *e = NULL; - unsigned long flags; - - spin_lock_irqsave(&dev->event_lock, flags); - if (file_priv->event_space < sizeof e->event) { - spin_unlock_irqrestore(&dev->event_lock, flags); - goto out; - } - file_priv->event_space -= sizeof e->event; - spin_unlock_irqrestore(&dev->event_lock, flags); + int ret; e = kzalloc(sizeof *e, GFP_KERNEL); - if (e == NULL) { - spin_lock_irqsave(&dev->event_lock, flags); - file_priv->event_space += sizeof e->event; - spin_unlock_irqrestore(&dev->event_lock, flags); - goto out; - } + if (!e) + return NULL; e->event.base.type = DRM_EVENT_FLIP_COMPLETE; - e->event.base.length = sizeof e->event; + e->event.base.length = sizeof(e->event); e->event.user_data = user_data; - e->base.event = &e->event.base; - e->base.file_priv = file_priv; - e->base.destroy = (void (*) (struct drm_pending_event *)) kfree; - -out: - return e; -} -static void destroy_vblank_event(struct drm_device *dev, - struct drm_file *file_priv, struct drm_pending_vblank_event *e) -{ - unsigned long flags; + ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base); + if (ret) { + kfree(e); + return NULL; + } - spin_lock_irqsave(&dev->event_lock, flags); - file_priv->event_space += sizeof e->event; - spin_unlock_irqrestore(&dev->event_lock, flags); - kfree(e); + return e; } static int atomic_set_prop(struct drm_atomic_state *state, @@ -1646,8 +1625,7 @@ out: if (!crtc_state->event) continue; - destroy_vblank_event(dev, file_priv, - crtc_state->event); + drm_event_cancel_free(dev, &crtc_state->event->base); } } diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index d40bab29747e..6e6514ef9968 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -5265,7 +5265,6 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, struct drm_crtc *crtc; struct drm_framebuffer *fb = NULL; struct drm_pending_vblank_event *e = NULL; - unsigned long flags; int ret = -EINVAL; if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS || @@ -5316,41 +5315,26 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, } if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) { - ret = -ENOMEM; - spin_lock_irqsave(&dev->event_lock, flags); - if (file_priv->event_space < sizeof(e->event)) { - spin_unlock_irqrestore(&dev->event_lock, flags); - goto out; - } - file_priv->event_space -= sizeof(e->event); - spin_unlock_irqrestore(&dev->event_lock, flags); - - e = kzalloc(sizeof(*e), GFP_KERNEL); - if (e == NULL) { - spin_lock_irqsave(&dev->event_lock, flags); - file_priv->event_space += sizeof(e->event); - spin_unlock_irqrestore(&dev->event_lock, flags); + e = kzalloc(sizeof *e, GFP_KERNEL); + if (!e) { + ret = -ENOMEM; goto out; } - e->event.base.type = DRM_EVENT_FLIP_COMPLETE; e->event.base.length = sizeof(e->event); e->event.user_data = page_flip->user_data; - e->base.event = &e->event.base; - e->base.file_priv = file_priv; - e->base.destroy = - (void (*) (struct drm_pending_event *)) kfree; + ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base); + if (ret) { + kfree(e); + goto out; + } } crtc->primary->old_fb = crtc->primary->fb; ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags); if (ret) { - if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) { - spin_lock_irqsave(&dev->event_lock, flags); - file_priv->event_space += sizeof(e->event); - spin_unlock_irqrestore(&dev->event_lock, flags); - kfree(e); - } + if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) + drm_event_cancel_free(dev, &e->base); /* Keep the old fb, don't unref it. */ crtc->primary->old_fb = NULL; } else { diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c index 1551d65db24e..f9eacbb2d1dd 100644 --- a/drivers/gpu/drm/drm_fops.c +++ b/drivers/gpu/drm/drm_fops.c @@ -676,3 +676,70 @@ unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) return mask; } EXPORT_SYMBOL(drm_poll); + +/** + * drm_event_reserve_init - init a DRM event and reserve space for it + * @dev: DRM device + * @file_priv: DRM file private data + * @p: tracking structure for the pending event + * @e: actual event data to deliver to userspace + * + * This function prepares the passed in event for eventual delivery. If the event + * doesn't get delivered (because the IOCTL fails later on, before queuing up + * anything) then the even must be cancelled and freed using + * drm_event_cancel_free(). + * + * If callers embedded @p into a larger structure it must be allocated with + * kmalloc and @p must be the first member element. + * + * RETURNS: + * + * 0 on success or a negative error code on failure. + */ +int drm_event_reserve_init(struct drm_device *dev, + struct drm_file *file_priv, + struct drm_pending_event *p, + struct drm_event *e) +{ + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&dev->event_lock, flags); + + if (file_priv->event_space < e->length) { + ret = -ENOMEM; + goto out; + } + + file_priv->event_space -= e->length; + + p->event = e; + p->file_priv = file_priv; + + /* we *could* pass this in as arg, but everyone uses kfree: */ + p->destroy = (void (*) (struct drm_pending_event *)) kfree; + +out: + spin_unlock_irqrestore(&dev->event_lock, flags); + return ret; +} +EXPORT_SYMBOL(drm_event_reserve_init); + +/** + * drm_event_cancel_free - free a DRM event and release it's space + * @dev: DRM device + * @p: tracking structure for the pending event + * + * This function frees the event @p initialized with drm_event_reserve_init() + * and releases any allocated space. + */ +void drm_event_cancel_free(struct drm_device *dev, + struct drm_pending_event *p) +{ + unsigned long flags; + spin_lock_irqsave(&dev->event_lock, flags); + p->file_priv->event_space += p->event->length; + spin_unlock_irqrestore(&dev->event_lock, flags); + p->destroy(p); +} +EXPORT_SYMBOL(drm_event_cancel_free); diff --git a/include/drm/drmP.h b/include/drm/drmP.h index a46a34fc67b3..04a66468e6e0 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -925,8 +925,13 @@ ssize_t drm_read(struct file *filp, char __user *buffer, size_t count, loff_t *offset); int drm_release(struct inode *inode, struct file *filp); int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv); - unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait); +int drm_event_reserve_init(struct drm_device *dev, + struct drm_file *file_priv, + struct drm_pending_event *p, + struct drm_event *e); +void drm_event_cancel_free(struct drm_device *dev, + struct drm_pending_event *p); /* Misc. IOCTL support (drm_ioctl.c) */ int drm_noop(struct drm_device *dev, void *data, -- 2.20.1