size_t ret = 0;
dmabuf = dentry->d_fsdata;
- mutex_lock(&dmabuf->lock);
+ dma_resv_lock(dmabuf->resv, NULL);
if (dmabuf->name)
ret = strlcpy(name, dmabuf->name, DMA_BUF_NAME_LEN);
- mutex_unlock(&dmabuf->lock);
+ dma_resv_unlock(dmabuf->resv);
return dynamic_dname(dentry, buffer, buflen, "/%s:%s",
dentry->d_name.name, ret > 0 ? name : "");
if (IS_ERR(name))
return PTR_ERR(name);
- mutex_lock(&dmabuf->lock);
+ dma_resv_lock(dmabuf->resv, NULL);
if (!list_empty(&dmabuf->attachments)) {
ret = -EBUSY;
kfree(name);
dmabuf->name = name;
out_unlock:
- mutex_unlock(&dmabuf->lock);
+ dma_resv_unlock(dmabuf->resv);
return ret;
}
/* Don't count the temporary reference taken inside procfs seq_show */
seq_printf(m, "count:\t%ld\n", file_count(dmabuf->file) - 1);
seq_printf(m, "exp_name:\t%s\n", dmabuf->exp_name);
- mutex_lock(&dmabuf->lock);
+ dma_resv_lock(dmabuf->resv, NULL);
if (dmabuf->name)
seq_printf(m, "name:\t%s\n", dmabuf->name);
- mutex_unlock(&dmabuf->lock);
+ dma_resv_unlock(dmabuf->resv);
}
static const struct file_operations dma_buf_fops = {
.llseek = dma_buf_llseek,
.poll = dma_buf_poll,
.unlocked_ioctl = dma_buf_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = dma_buf_ioctl,
-#endif
+ .compat_ioctl = compat_ptr_ioctl,
.show_fdinfo = dma_buf_show_fdinfo,
};
return ERR_PTR(-EINVAL);
}
+ if (WARN_ON(exp_info->ops->cache_sgt_mapping &&
+ exp_info->ops->dynamic_mapping))
+ return ERR_PTR(-EINVAL);
+
if (!try_module_get(exp_info->owner))
return ERR_PTR(-ENOENT);
EXPORT_SYMBOL_GPL(dma_buf_put);
/**
- * dma_buf_attach - Add the device to dma_buf's attachments list; optionally,
+ * dma_buf_dynamic_attach - Add the device to dma_buf's attachments list; optionally,
* calls attach() of dma_buf_ops to allow device-specific attach functionality
- * @dmabuf: [in] buffer to attach device to.
- * @dev: [in] device to be attached.
+ * @dmabuf: [in] buffer to attach device to.
+ * @dev: [in] device to be attached.
+ * @dynamic_mapping: [in] calling convention for map/unmap
*
* Returns struct dma_buf_attachment pointer for this attachment. Attachments
* must be cleaned up by calling dma_buf_detach().
* accessible to @dev, and cannot be moved to a more suitable place. This is
* indicated with the error code -EBUSY.
*/
-struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
- struct device *dev)
+struct dma_buf_attachment *
+dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
+ bool dynamic_mapping)
{
struct dma_buf_attachment *attach;
int ret;
attach->dev = dev;
attach->dmabuf = dmabuf;
-
- mutex_lock(&dmabuf->lock);
+ attach->dynamic_mapping = dynamic_mapping;
if (dmabuf->ops->attach) {
ret = dmabuf->ops->attach(dmabuf, attach);
if (ret)
goto err_attach;
}
+ dma_resv_lock(dmabuf->resv, NULL);
list_add(&attach->node, &dmabuf->attachments);
+ dma_resv_unlock(dmabuf->resv);
- mutex_unlock(&dmabuf->lock);
+ /* When either the importer or the exporter can't handle dynamic
+ * mappings we cache the mapping here to avoid issues with the
+ * reservation object lock.
+ */
+ if (dma_buf_attachment_is_dynamic(attach) !=
+ dma_buf_is_dynamic(dmabuf)) {
+ struct sg_table *sgt;
+
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_lock(attach->dmabuf->resv, NULL);
+
+ sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL);
+ if (!sgt)
+ sgt = ERR_PTR(-ENOMEM);
+ if (IS_ERR(sgt)) {
+ ret = PTR_ERR(sgt);
+ goto err_unlock;
+ }
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_unlock(attach->dmabuf->resv);
+ attach->sgt = sgt;
+ attach->dir = DMA_BIDIRECTIONAL;
+ }
return attach;
err_attach:
kfree(attach);
- mutex_unlock(&dmabuf->lock);
return ERR_PTR(ret);
+
+err_unlock:
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_unlock(attach->dmabuf->resv);
+
+ dma_buf_detach(dmabuf, attach);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(dma_buf_dynamic_attach);
+
+/**
+ * dma_buf_attach - Wrapper for dma_buf_dynamic_attach
+ * @dmabuf: [in] buffer to attach device to.
+ * @dev: [in] device to be attached.
+ *
+ * Wrapper to call dma_buf_dynamic_attach() for drivers which still use a static
+ * mapping.
+ */
+struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
+ struct device *dev)
+{
+ return dma_buf_dynamic_attach(dmabuf, dev, false);
}
EXPORT_SYMBOL_GPL(dma_buf_attach);
if (WARN_ON(!dmabuf || !attach))
return;
- if (attach->sgt)
+ if (attach->sgt) {
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_lock(attach->dmabuf->resv, NULL);
+
dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);
- mutex_lock(&dmabuf->lock);
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_unlock(attach->dmabuf->resv);
+ }
+
+ dma_resv_lock(dmabuf->resv, NULL);
list_del(&attach->node);
+ dma_resv_unlock(dmabuf->resv);
if (dmabuf->ops->detach)
dmabuf->ops->detach(dmabuf, attach);
- mutex_unlock(&dmabuf->lock);
kfree(attach);
}
EXPORT_SYMBOL_GPL(dma_buf_detach);
if (WARN_ON(!attach || !attach->dmabuf))
return ERR_PTR(-EINVAL);
+ if (dma_buf_attachment_is_dynamic(attach))
+ dma_resv_assert_held(attach->dmabuf->resv);
+
if (attach->sgt) {
/*
* Two mappings with different directions for the same
return attach->sgt;
}
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_assert_held(attach->dmabuf->resv);
+
sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
if (!sg_table)
sg_table = ERR_PTR(-ENOMEM);
if (WARN_ON(!attach || !attach->dmabuf || !sg_table))
return;
+ if (dma_buf_attachment_is_dynamic(attach))
+ dma_resv_assert_held(attach->dmabuf->resv);
+
if (attach->sgt == sg_table)
return;
+ if (dma_buf_is_dynamic(attach->dmabuf))
+ dma_resv_assert_held(attach->dmabuf->resv);
+
attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);
}
EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment);
"size", "flags", "mode", "count", "ino");
list_for_each_entry(buf_obj, &db_list.head, list_node) {
- ret = mutex_lock_interruptible(&buf_obj->lock);
- if (ret) {
- seq_puts(s,
- "\tERROR locking buffer object: skipping\n");
- continue;
- }
+ ret = dma_resv_lock_interruptible(buf_obj->resv, NULL);
+ if (ret)
+ goto error_unlock;
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
seq_printf(s, "\t%s\n", dev_name(attach_obj->dev));
attach_count++;
}
+ dma_resv_unlock(buf_obj->resv);
seq_printf(s, "Total %d devices attached\n\n",
attach_count);
count++;
size += buf_obj->size;
- mutex_unlock(&buf_obj->lock);
}
seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size);
mutex_unlock(&db_list.lock);
return 0;
+
+error_unlock:
+ mutex_unlock(&db_list.lock);
+ return ret;
}
DEFINE_SHOW_ATTRIBUTE(dma_buf_debug);
projects / linux-2.6-microblaze.git / blobdiff