static int drm_lock_take(struct drm_lock_data *lock_data, unsigned int context);
+/**
+ * Take the heavyweight lock.
+ *
+ * \param lock lock pointer.
+ * \param context locking context.
+ * \return one if the lock is held, or zero otherwise.
+ *
+ * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction.
+ */
+static
+int drm_lock_take(struct drm_lock_data *lock_data,
+ unsigned int context)
+{
+ unsigned int old, new, prev;
+ volatile unsigned int *lock = &lock_data->hw_lock->lock;
+
+ spin_lock_bh(&lock_data->spinlock);
+ do {
+ old = *lock;
+ if (old & _DRM_LOCK_HELD)
+ new = old | _DRM_LOCK_CONT;
+ else {
+ new = context | _DRM_LOCK_HELD |
+ ((lock_data->user_waiters + lock_data->kernel_waiters > 1) ?
+ _DRM_LOCK_CONT : 0);
+ }
+ prev = cmpxchg(lock, old, new);
+ } while (prev != old);
+ spin_unlock_bh(&lock_data->spinlock);
+
+ if (_DRM_LOCKING_CONTEXT(old) == context) {
+ if (old & _DRM_LOCK_HELD) {
+ if (context != DRM_KERNEL_CONTEXT) {
+ DRM_ERROR("%d holds heavyweight lock\n",
+ context);
+ }
+ return 0;
+ }
+ }
+
+ if ((_DRM_LOCKING_CONTEXT(new)) == context && (new & _DRM_LOCK_HELD)) {
+ /* Have lock */
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * This takes a lock forcibly and hands it to context. Should ONLY be used
+ * inside *_unlock to give lock to kernel before calling *_dma_schedule.
+ *
+ * \param dev DRM device.
+ * \param lock lock pointer.
+ * \param context locking context.
+ * \return always one.
+ *
+ * Resets the lock file pointer.
+ * Marks the lock as held by the given context, via the \p cmpxchg instruction.
+ */
+static int drm_lock_transfer(struct drm_lock_data *lock_data,
+ unsigned int context)
+{
+ unsigned int old, new, prev;
+ volatile unsigned int *lock = &lock_data->hw_lock->lock;
+
+ lock_data->file_priv = NULL;
+ do {
+ old = *lock;
+ new = context | _DRM_LOCK_HELD;
+ prev = cmpxchg(lock, old, new);
+ } while (prev != old);
+ return 1;
+}
+
+static int drm_legacy_lock_free(struct drm_lock_data *lock_data,
+ unsigned int context)
+{
+ unsigned int old, new, prev;
+ volatile unsigned int *lock = &lock_data->hw_lock->lock;
+
+ spin_lock_bh(&lock_data->spinlock);
+ if (lock_data->kernel_waiters != 0) {
+ drm_lock_transfer(lock_data, 0);
+ lock_data->idle_has_lock = 1;
+ spin_unlock_bh(&lock_data->spinlock);
+ return 1;
+ }
+ spin_unlock_bh(&lock_data->spinlock);
+
+ do {
+ old = *lock;
+ new = _DRM_LOCKING_CONTEXT(old);
+ prev = cmpxchg(lock, old, new);
+ } while (prev != old);
+
+ if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) {
+ DRM_ERROR("%d freed heavyweight lock held by %d\n",
+ context, _DRM_LOCKING_CONTEXT(old));
+ return 1;
+ }
+ wake_up_interruptible(&lock_data->lock_queue);
+ return 0;
+}
+
/**
* Lock ioctl.
*
return 0;
}
-/**
- * Take the heavyweight lock.
- *
- * \param lock lock pointer.
- * \param context locking context.
- * \return one if the lock is held, or zero otherwise.
- *
- * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction.
- */
-static
-int drm_lock_take(struct drm_lock_data *lock_data,
- unsigned int context)
-{
- unsigned int old, new, prev;
- volatile unsigned int *lock = &lock_data->hw_lock->lock;
-
- spin_lock_bh(&lock_data->spinlock);
- do {
- old = *lock;
- if (old & _DRM_LOCK_HELD)
- new = old | _DRM_LOCK_CONT;
- else {
- new = context | _DRM_LOCK_HELD |
- ((lock_data->user_waiters + lock_data->kernel_waiters > 1) ?
- _DRM_LOCK_CONT : 0);
- }
- prev = cmpxchg(lock, old, new);
- } while (prev != old);
- spin_unlock_bh(&lock_data->spinlock);
-
- if (_DRM_LOCKING_CONTEXT(old) == context) {
- if (old & _DRM_LOCK_HELD) {
- if (context != DRM_KERNEL_CONTEXT) {
- DRM_ERROR("%d holds heavyweight lock\n",
- context);
- }
- return 0;
- }
- }
-
- if ((_DRM_LOCKING_CONTEXT(new)) == context && (new & _DRM_LOCK_HELD)) {
- /* Have lock */
- return 1;
- }
- return 0;
-}
-
-/**
- * This takes a lock forcibly and hands it to context. Should ONLY be used
- * inside *_unlock to give lock to kernel before calling *_dma_schedule.
- *
- * \param dev DRM device.
- * \param lock lock pointer.
- * \param context locking context.
- * \return always one.
- *
- * Resets the lock file pointer.
- * Marks the lock as held by the given context, via the \p cmpxchg instruction.
- */
-static int drm_lock_transfer(struct drm_lock_data *lock_data,
- unsigned int context)
-{
- unsigned int old, new, prev;
- volatile unsigned int *lock = &lock_data->hw_lock->lock;
-
- lock_data->file_priv = NULL;
- do {
- old = *lock;
- new = context | _DRM_LOCK_HELD;
- prev = cmpxchg(lock, old, new);
- } while (prev != old);
- return 1;
-}
-
-/**
- * Free lock.
- *
- * \param dev DRM device.
- * \param lock lock.
- * \param context context.
- *
- * Resets the lock file pointer.
- * Marks the lock as not held, via the \p cmpxchg instruction. Wakes any task
- * waiting on the lock queue.
- */
-int drm_legacy_lock_free(struct drm_lock_data *lock_data, unsigned int context)
-{
- unsigned int old, new, prev;
- volatile unsigned int *lock = &lock_data->hw_lock->lock;
-
- spin_lock_bh(&lock_data->spinlock);
- if (lock_data->kernel_waiters != 0) {
- drm_lock_transfer(lock_data, 0);
- lock_data->idle_has_lock = 1;
- spin_unlock_bh(&lock_data->spinlock);
- return 1;
- }
- spin_unlock_bh(&lock_data->spinlock);
-
- do {
- old = *lock;
- new = _DRM_LOCKING_CONTEXT(old);
- prev = cmpxchg(lock, old, new);
- } while (prev != old);
-
- if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) {
- DRM_ERROR("%d freed heavyweight lock held by %d\n",
- context, _DRM_LOCKING_CONTEXT(old));
- return 1;
- }
- wake_up_interruptible(&lock_data->lock_queue);
- return 0;
-}
-
/**
* This function returns immediately and takes the hw lock
* with the kernel context if it is free, otherwise it gets the highest priority when and if
}
EXPORT_SYMBOL(drm_legacy_idlelock_release);
-int drm_legacy_i_have_hw_lock(struct drm_device *dev,
- struct drm_file *file_priv)
+static int drm_legacy_i_have_hw_lock(struct drm_device *dev,
+ struct drm_file *file_priv)
{
struct drm_master *master = file_priv->master;
return (file_priv->lock_count && master->lock.hw_lock &&
_DRM_LOCK_IS_HELD(master->lock.hw_lock->lock) &&
master->lock.file_priv == file_priv);
}
+
+void drm_legacy_lock_release(struct drm_device *dev, struct file *filp)
+{
+ struct drm_file *file_priv = filp->private_data;
+
+ /* if the master has gone away we can't do anything with the lock */
+ if (!dev->master)
+ return;
+
+ if (drm_legacy_i_have_hw_lock(dev, file_priv)) {
+ DRM_DEBUG("File %p released, freeing lock for context %d\n",
+ filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
+ drm_legacy_lock_free(&file_priv->master->lock,
+ _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
+ }
+}
projects / cascardo / linux.git / blobdiff