diff options
author | Eric Anholt <eric@anholt.net> | 2009-03-11 12:30:04 -0700 |
---|---|---|
committer | Eric Anholt <eric@anholt.net> | 2009-03-27 14:47:34 -0700 |
commit | 201361a54ed187d8595a283e3a4ddb213bc8323b (patch) | |
tree | 12a5d23a45f72f8bd917161735d55985654b52e0 /drivers/gpu/drm/i915/i915_dma.c | |
parent | eb01459fbbccb4ca0b879cbfc97e33ac6eabf975 (diff) | |
download | op-kernel-dev-201361a54ed187d8595a283e3a4ddb213bc8323b.zip op-kernel-dev-201361a54ed187d8595a283e3a4ddb213bc8323b.tar.gz |
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>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_dma.c')
-rw-r--r-- | drivers/gpu/drm/i915/i915_dma.c | 107 |
1 files changed, 73 insertions, 34 deletions
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 6d21b9e..ae83fe0 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -356,7 +356,7 @@ static int validate_cmd(int cmd) return ret; } -static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwords) +static int i915_emit_cmds(struct drm_device * dev, int *buffer, int dwords) { drm_i915_private_t *dev_priv = dev->dev_private; int i; @@ -370,8 +370,7 @@ static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwor for (i = 0; i < dwords;) { int cmd, sz; - if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i], sizeof(cmd))) - return -EINVAL; + cmd = buffer[i]; if ((sz = validate_cmd(cmd)) == 0 || i + sz > dwords) return -EINVAL; @@ -379,11 +378,7 @@ static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwor OUT_RING(cmd); while (++i, --sz) { - if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i], - sizeof(cmd))) { - return -EINVAL; - } - OUT_RING(cmd); + OUT_RING(buffer[i]); } } @@ -397,17 +392,13 @@ static int i915_emit_cmds(struct drm_device * dev, int __user * buffer, int dwor int i915_emit_box(struct drm_device *dev, - struct drm_clip_rect __user *boxes, + struct drm_clip_rect *boxes, int i, int DR1, int DR4) { drm_i915_private_t *dev_priv = dev->dev_private; - struct drm_clip_rect box; + struct drm_clip_rect box = boxes[i]; RING_LOCALS; - if (DRM_COPY_FROM_USER_UNCHECKED(&box, &boxes[i], sizeof(box))) { - return -EFAULT; - } - if (box.y2 <= box.y1 || box.x2 <= box.x1 || box.y2 <= 0 || box.x2 <= 0) { DRM_ERROR("Bad box %d,%d..%d,%d\n", box.x1, box.y1, box.x2, box.y2); @@ -460,7 +451,9 @@ static void i915_emit_breadcrumb(struct drm_device *dev) } static int i915_dispatch_cmdbuffer(struct drm_device * dev, - drm_i915_cmdbuffer_t * cmd) + drm_i915_cmdbuffer_t *cmd, + struct drm_clip_rect *cliprects, + void *cmdbuf) { int nbox = cmd->num_cliprects; int i = 0, count, ret; @@ -476,13 +469,13 @@ static int i915_dispatch_cmdbuffer(struct drm_device * dev, for (i = 0; i < count; i++) { if (i < nbox) { - ret = i915_emit_box(dev, cmd->cliprects, i, + ret = i915_emit_box(dev, cliprects, i, cmd->DR1, cmd->DR4); if (ret) return ret; } - ret = i915_emit_cmds(dev, (int __user *)cmd->buf, cmd->sz / 4); + ret = i915_emit_cmds(dev, cmdbuf, cmd->sz / 4); if (ret) return ret; } @@ -492,10 +485,10 @@ static int i915_dispatch_cmdbuffer(struct drm_device * dev, } static int i915_dispatch_batchbuffer(struct drm_device * dev, - drm_i915_batchbuffer_t * batch) + drm_i915_batchbuffer_t * batch, + struct drm_clip_rect *cliprects) { drm_i915_private_t *dev_priv = dev->dev_private; - struct drm_clip_rect __user *boxes = batch->cliprects; int nbox = batch->num_cliprects; int i = 0, count; RING_LOCALS; @@ -511,7 +504,7 @@ static int i915_dispatch_batchbuffer(struct drm_device * dev, for (i = 0; i < count; i++) { if (i < nbox) { - int ret = i915_emit_box(dev, boxes, i, + int ret = i915_emit_box(dev, cliprects, i, batch->DR1, batch->DR4); if (ret) return ret; @@ -626,6 +619,7 @@ static int i915_batchbuffer(struct drm_device *dev, void *data, master_priv->sarea_priv; drm_i915_batchbuffer_t *batch = data; int ret; + struct drm_clip_rect *cliprects = NULL; if (!dev_priv->allow_batchbuffer) { DRM_ERROR("Batchbuffer ioctl disabled\n"); @@ -637,17 +631,35 @@ static int i915_batchbuffer(struct drm_device *dev, void *data, RING_LOCK_TEST_WITH_RETURN(dev, file_priv); - if (batch->num_cliprects && DRM_VERIFYAREA_READ(batch->cliprects, - batch->num_cliprects * - sizeof(struct drm_clip_rect))) - return -EFAULT; + if (batch->num_cliprects < 0) + return -EINVAL; + + if (batch->num_cliprects) { + cliprects = drm_calloc(batch->num_cliprects, + sizeof(struct drm_clip_rect), + DRM_MEM_DRIVER); + if (cliprects == NULL) + return -ENOMEM; + + ret = copy_from_user(cliprects, batch->cliprects, + batch->num_cliprects * + sizeof(struct drm_clip_rect)); + if (ret != 0) + goto fail_free; + } mutex_lock(&dev->struct_mutex); - ret = i915_dispatch_batchbuffer(dev, batch); + ret = i915_dispatch_batchbuffer(dev, batch, cliprects); mutex_unlock(&dev->struct_mutex); if (sarea_priv) sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv); + +fail_free: + drm_free(cliprects, + batch->num_cliprects * sizeof(struct drm_clip_rect), + DRM_MEM_DRIVER); + return ret; } @@ -659,6 +671,8 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data, drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *) master_priv->sarea_priv; drm_i915_cmdbuffer_t *cmdbuf = data; + struct drm_clip_rect *cliprects = NULL; + void *batch_data; int ret; DRM_DEBUG("i915 cmdbuffer, buf %p sz %d cliprects %d\n", @@ -666,25 +680,50 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data, RING_LOCK_TEST_WITH_RETURN(dev, file_priv); - if (cmdbuf->num_cliprects && - DRM_VERIFYAREA_READ(cmdbuf->cliprects, - cmdbuf->num_cliprects * - sizeof(struct drm_clip_rect))) { - DRM_ERROR("Fault accessing cliprects\n"); - return -EFAULT; + if (cmdbuf->num_cliprects < 0) + return -EINVAL; + + batch_data = drm_alloc(cmdbuf->sz, DRM_MEM_DRIVER); + if (batch_data == NULL) + return -ENOMEM; + + ret = copy_from_user(batch_data, cmdbuf->buf, cmdbuf->sz); + if (ret != 0) + goto fail_batch_free; + + if (cmdbuf->num_cliprects) { + cliprects = drm_calloc(cmdbuf->num_cliprects, + sizeof(struct drm_clip_rect), + DRM_MEM_DRIVER); + if (cliprects == NULL) + goto fail_batch_free; + + ret = copy_from_user(cliprects, cmdbuf->cliprects, + cmdbuf->num_cliprects * + sizeof(struct drm_clip_rect)); + if (ret != 0) + goto fail_clip_free; } mutex_lock(&dev->struct_mutex); - ret = i915_dispatch_cmdbuffer(dev, cmdbuf); + ret = i915_dispatch_cmdbuffer(dev, cmdbuf, cliprects, batch_data); mutex_unlock(&dev->struct_mutex); if (ret) { DRM_ERROR("i915_dispatch_cmdbuffer failed\n"); - return ret; + goto fail_batch_free; } if (sarea_priv) sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv); - return 0; + +fail_batch_free: + drm_free(batch_data, cmdbuf->sz, DRM_MEM_DRIVER); +fail_clip_free: + drm_free(cliprects, + cmdbuf->num_cliprects * sizeof(struct drm_clip_rect), + DRM_MEM_DRIVER); + + return ret; } static int i915_flip_bufs(struct drm_device *dev, void *data, |