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drm/i915: Fix lock order reversal with cliprects and cmdbuf in non-DRI2 paths.
This introduces allocation in the batch submission path that wasn't there previously, but these are compatibility paths so we care about simplicity more than performance. kernel.org bug #12419. Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Keith Packard <keithp@keithp.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Eric Anholt
parent
eb01459fbb
commit
201361a54e
@ -356,7 +356,7 @@ static int validate_cmd(int cmd)
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return ret;
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}
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static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwords)
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static int i915_emit_cmds(struct drm_device * dev, int *buffer, int dwords)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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int i;
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@ -370,8 +370,7 @@ static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwor
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for (i = 0; i < dwords;) {
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int cmd, sz;
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if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i], sizeof(cmd)))
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return -EINVAL;
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cmd = buffer[i];
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if ((sz = validate_cmd(cmd)) == 0 || i + sz > dwords)
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return -EINVAL;
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@ -379,11 +378,7 @@ static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwor
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OUT_RING(cmd);
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while (++i, --sz) {
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if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i],
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sizeof(cmd))) {
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return -EINVAL;
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}
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OUT_RING(cmd);
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OUT_RING(buffer[i]);
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}
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}
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@ -397,17 +392,13 @@ static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwor
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int
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i915_emit_box(struct drm_device *dev,
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struct drm_clip_rect __user *boxes,
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struct drm_clip_rect *boxes,
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int i, int DR1, int DR4)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct drm_clip_rect box;
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struct drm_clip_rect box = boxes[i];
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RING_LOCALS;
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if (DRM_COPY_FROM_USER_UNCHECKED(&box, &boxes[i], sizeof(box))) {
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return -EFAULT;
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}
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if (box.y2 <= box.y1 || box.x2 <= box.x1 || box.y2 <= 0 || box.x2 <= 0) {
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DRM_ERROR("Bad box %d,%d..%d,%d\n",
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box.x1, box.y1, box.x2, box.y2);
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@ -460,7 +451,9 @@ static void i915_emit_breadcrumb(struct drm_device *dev)
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}
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static int i915_dispatch_cmdbuffer(struct drm_device * dev,
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drm_i915_cmdbuffer_t * cmd)
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drm_i915_cmdbuffer_t *cmd,
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struct drm_clip_rect *cliprects,
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void *cmdbuf)
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{
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int nbox = cmd->num_cliprects;
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int i = 0, count, ret;
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@ -476,13 +469,13 @@ static int i915_dispatch_cmdbuffer(struct drm_device * dev,
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for (i = 0; i < count; i++) {
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if (i < nbox) {
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ret = i915_emit_box(dev, cmd->cliprects, i,
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ret = i915_emit_box(dev, cliprects, i,
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cmd->DR1, cmd->DR4);
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if (ret)
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return ret;
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}
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ret = i915_emit_cmds(dev, (int __user *)cmd->buf, cmd->sz / 4);
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ret = i915_emit_cmds(dev, cmdbuf, cmd->sz / 4);
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if (ret)
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return ret;
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}
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@ -492,10 +485,10 @@ static int i915_dispatch_cmdbuffer(struct drm_device * dev,
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}
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static int i915_dispatch_batchbuffer(struct drm_device * dev,
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drm_i915_batchbuffer_t * batch)
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drm_i915_batchbuffer_t * batch,
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struct drm_clip_rect *cliprects)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct drm_clip_rect __user *boxes = batch->cliprects;
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int nbox = batch->num_cliprects;
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int i = 0, count;
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RING_LOCALS;
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@ -511,7 +504,7 @@ static int i915_dispatch_batchbuffer(struct drm_device * dev,
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for (i = 0; i < count; i++) {
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if (i < nbox) {
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int ret = i915_emit_box(dev, boxes, i,
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int ret = i915_emit_box(dev, cliprects, i,
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batch->DR1, batch->DR4);
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if (ret)
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return ret;
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@ -626,6 +619,7 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
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master_priv->sarea_priv;
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drm_i915_batchbuffer_t *batch = data;
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int ret;
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struct drm_clip_rect *cliprects = NULL;
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if (!dev_priv->allow_batchbuffer) {
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DRM_ERROR("Batchbuffer ioctl disabled\n");
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@ -637,17 +631,35 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
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RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
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if (batch->num_cliprects && DRM_VERIFYAREA_READ(batch->cliprects,
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batch->num_cliprects *
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sizeof(struct drm_clip_rect)))
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return -EFAULT;
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if (batch->num_cliprects < 0)
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return -EINVAL;
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if (batch->num_cliprects) {
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cliprects = drm_calloc(batch->num_cliprects,
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sizeof(struct drm_clip_rect),
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DRM_MEM_DRIVER);
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if (cliprects == NULL)
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return -ENOMEM;
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ret = copy_from_user(cliprects, batch->cliprects,
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batch->num_cliprects *
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sizeof(struct drm_clip_rect));
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if (ret != 0)
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goto fail_free;
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}
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mutex_lock(&dev->struct_mutex);
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ret = i915_dispatch_batchbuffer(dev, batch);
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ret = i915_dispatch_batchbuffer(dev, batch, cliprects);
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mutex_unlock(&dev->struct_mutex);
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if (sarea_priv)
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sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
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fail_free:
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drm_free(cliprects,
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batch->num_cliprects * sizeof(struct drm_clip_rect),
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DRM_MEM_DRIVER);
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return ret;
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}
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@ -659,6 +671,8 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
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drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
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master_priv->sarea_priv;
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drm_i915_cmdbuffer_t *cmdbuf = data;
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struct drm_clip_rect *cliprects = NULL;
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void *batch_data;
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int ret;
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DRM_DEBUG("i915 cmdbuffer, buf %p sz %d cliprects %d\n",
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@ -666,25 +680,50 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
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RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
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if (cmdbuf->num_cliprects &&
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DRM_VERIFYAREA_READ(cmdbuf->cliprects,
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cmdbuf->num_cliprects *
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sizeof(struct drm_clip_rect))) {
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DRM_ERROR("Fault accessing cliprects\n");
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return -EFAULT;
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if (cmdbuf->num_cliprects < 0)
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return -EINVAL;
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batch_data = drm_alloc(cmdbuf->sz, DRM_MEM_DRIVER);
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if (batch_data == NULL)
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return -ENOMEM;
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ret = copy_from_user(batch_data, cmdbuf->buf, cmdbuf->sz);
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if (ret != 0)
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goto fail_batch_free;
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if (cmdbuf->num_cliprects) {
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cliprects = drm_calloc(cmdbuf->num_cliprects,
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sizeof(struct drm_clip_rect),
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DRM_MEM_DRIVER);
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if (cliprects == NULL)
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goto fail_batch_free;
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ret = copy_from_user(cliprects, cmdbuf->cliprects,
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cmdbuf->num_cliprects *
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sizeof(struct drm_clip_rect));
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if (ret != 0)
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goto fail_clip_free;
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}
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mutex_lock(&dev->struct_mutex);
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ret = i915_dispatch_cmdbuffer(dev, cmdbuf);
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ret = i915_dispatch_cmdbuffer(dev, cmdbuf, cliprects, batch_data);
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mutex_unlock(&dev->struct_mutex);
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if (ret) {
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DRM_ERROR("i915_dispatch_cmdbuffer failed\n");
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return ret;
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goto fail_batch_free;
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}
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if (sarea_priv)
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sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
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return 0;
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fail_batch_free:
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drm_free(batch_data, cmdbuf->sz, DRM_MEM_DRIVER);
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fail_clip_free:
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drm_free(cliprects,
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cmdbuf->num_cliprects * sizeof(struct drm_clip_rect),
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DRM_MEM_DRIVER);
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return ret;
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}
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static int i915_flip_bufs(struct drm_device *dev, void *data,
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@ -520,7 +520,7 @@ extern int i915_driver_device_is_agp(struct drm_device * dev);
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extern long i915_compat_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg);
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extern int i915_emit_box(struct drm_device *dev,
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struct drm_clip_rect __user *boxes,
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struct drm_clip_rect *boxes,
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int i, int DR1, int DR4);
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/* i915_irq.c */
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@ -2891,11 +2891,10 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
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static int
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i915_dispatch_gem_execbuffer(struct drm_device *dev,
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struct drm_i915_gem_execbuffer *exec,
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struct drm_clip_rect *cliprects,
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uint64_t exec_offset)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct drm_clip_rect __user *boxes = (struct drm_clip_rect __user *)
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(uintptr_t) exec->cliprects_ptr;
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int nbox = exec->num_cliprects;
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int i = 0, count;
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uint32_t exec_start, exec_len;
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@ -2916,7 +2915,7 @@ i915_dispatch_gem_execbuffer(struct drm_device *dev,
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for (i = 0; i < count; i++) {
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if (i < nbox) {
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int ret = i915_emit_box(dev, boxes, i,
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int ret = i915_emit_box(dev, cliprects, i,
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exec->DR1, exec->DR4);
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if (ret)
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return ret;
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@ -2983,6 +2982,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
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struct drm_gem_object **object_list = NULL;
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struct drm_gem_object *batch_obj;
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struct drm_i915_gem_object *obj_priv;
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struct drm_clip_rect *cliprects = NULL;
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int ret, i, pinned = 0;
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uint64_t exec_offset;
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uint32_t seqno, flush_domains;
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@ -3019,6 +3019,23 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
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goto pre_mutex_err;
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}
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if (args->num_cliprects != 0) {
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cliprects = drm_calloc(args->num_cliprects, sizeof(*cliprects),
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DRM_MEM_DRIVER);
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if (cliprects == NULL)
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goto pre_mutex_err;
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ret = copy_from_user(cliprects,
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(struct drm_clip_rect __user *)
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(uintptr_t) args->cliprects_ptr,
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sizeof(*cliprects) * args->num_cliprects);
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if (ret != 0) {
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DRM_ERROR("copy %d cliprects failed: %d\n",
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args->num_cliprects, ret);
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goto pre_mutex_err;
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}
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}
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mutex_lock(&dev->struct_mutex);
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i915_verify_inactive(dev, __FILE__, __LINE__);
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@ -3155,7 +3172,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
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#endif
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/* Exec the batchbuffer */
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ret = i915_dispatch_gem_execbuffer(dev, args, exec_offset);
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ret = i915_dispatch_gem_execbuffer(dev, args, cliprects, exec_offset);
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if (ret) {
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DRM_ERROR("dispatch failed %d\n", ret);
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goto err;
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@ -3224,6 +3241,8 @@ pre_mutex_err:
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DRM_MEM_DRIVER);
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drm_free(exec_list, sizeof(*exec_list) * args->buffer_count,
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DRM_MEM_DRIVER);
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drm_free(cliprects, sizeof(*cliprects) * args->num_cliprects,
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DRM_MEM_DRIVER);
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return ret;
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}
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