2011-11-25 08:21:02 -07:00
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/*
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* Copyright © 2012 Red Hat
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Dave Airlie <airlied@redhat.com>
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* Rob Clark <rob.clark@linaro.org>
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*
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*/
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#include <linux/export.h>
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#include <linux/dma-buf.h>
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2012-10-02 11:01:07 -06:00
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#include <drm/drmP.h>
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2011-11-25 08:21:02 -07:00
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/*
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* DMA-BUF/GEM Object references and lifetime overview:
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*
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* On the export the dma_buf holds a reference to the exporting GEM
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* object. It takes this reference in handle_to_fd_ioctl, when it
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* first calls .prime_export and stores the exporting GEM object in
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* the dma_buf priv. This reference is released when the dma_buf
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* object goes away in the driver .release function.
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*
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* On the import the importing GEM object holds a reference to the
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* dma_buf (which in turn holds a ref to the exporting GEM object).
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* It takes that reference in the fd_to_handle ioctl.
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* It calls dma_buf_get, creates an attachment to it and stores the
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* attachment in the GEM object. When this attachment is destroyed
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* when the imported object is destroyed, we remove the attachment
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* and drop the reference to the dma_buf.
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*
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* Thus the chain of references always flows in one direction
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* (avoiding loops): importing_gem -> dmabuf -> exporting_gem
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*
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* Self-importing: if userspace is using PRIME as a replacement for flink
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* then it will get a fd->handle request for a GEM object that it created.
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* Drivers should detect this situation and return back the gem object
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* from the dma-buf private.
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*/
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struct drm_prime_member {
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struct list_head entry;
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struct dma_buf *dma_buf;
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uint32_t handle;
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};
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int drm_gem_prime_handle_to_fd(struct drm_device *dev,
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struct drm_file *file_priv, uint32_t handle, uint32_t flags,
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int *prime_fd)
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{
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struct drm_gem_object *obj;
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void *buf;
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2012-05-20 10:31:16 -06:00
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int ret;
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2011-11-25 08:21:02 -07:00
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obj = drm_gem_object_lookup(dev, file_priv, handle);
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if (!obj)
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return -ENOENT;
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mutex_lock(&file_priv->prime.lock);
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/* re-export the original imported object */
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if (obj->import_attach) {
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get_dma_buf(obj->import_attach->dmabuf);
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*prime_fd = dma_buf_fd(obj->import_attach->dmabuf, flags);
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drm_gem_object_unreference_unlocked(obj);
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mutex_unlock(&file_priv->prime.lock);
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return 0;
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}
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if (obj->export_dma_buf) {
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get_dma_buf(obj->export_dma_buf);
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*prime_fd = dma_buf_fd(obj->export_dma_buf, flags);
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drm_gem_object_unreference_unlocked(obj);
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} else {
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buf = dev->driver->gem_prime_export(dev, obj, flags);
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if (IS_ERR(buf)) {
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/* normally the created dma-buf takes ownership of the ref,
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* but if that fails then drop the ref
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*/
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drm_gem_object_unreference_unlocked(obj);
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mutex_unlock(&file_priv->prime.lock);
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return PTR_ERR(buf);
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}
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obj->export_dma_buf = buf;
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*prime_fd = dma_buf_fd(buf, flags);
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}
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2012-05-20 10:31:16 -06:00
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/* if we've exported this buffer the cheat and add it to the import list
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* so we get the correct handle back
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*/
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ret = drm_prime_add_imported_buf_handle(&file_priv->prime,
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obj->export_dma_buf, handle);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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mutex_unlock(&file_priv->prime.lock);
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return ret;
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}
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2011-11-25 08:21:02 -07:00
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mutex_unlock(&file_priv->prime.lock);
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return 0;
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}
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EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
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int drm_gem_prime_fd_to_handle(struct drm_device *dev,
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struct drm_file *file_priv, int prime_fd, uint32_t *handle)
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{
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struct dma_buf *dma_buf;
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struct drm_gem_object *obj;
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int ret;
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dma_buf = dma_buf_get(prime_fd);
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if (IS_ERR(dma_buf))
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return PTR_ERR(dma_buf);
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mutex_lock(&file_priv->prime.lock);
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ret = drm_prime_lookup_imported_buf_handle(&file_priv->prime,
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dma_buf, handle);
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if (!ret) {
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ret = 0;
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goto out_put;
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}
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/* never seen this one, need to import */
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obj = dev->driver->gem_prime_import(dev, dma_buf);
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if (IS_ERR(obj)) {
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ret = PTR_ERR(obj);
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goto out_put;
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}
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ret = drm_gem_handle_create(file_priv, obj, handle);
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drm_gem_object_unreference_unlocked(obj);
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if (ret)
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goto out_put;
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ret = drm_prime_add_imported_buf_handle(&file_priv->prime,
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dma_buf, *handle);
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if (ret)
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goto fail;
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mutex_unlock(&file_priv->prime.lock);
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return 0;
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fail:
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/* hmm, if driver attached, we are relying on the free-object path
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* to detach.. which seems ok..
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*/
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drm_gem_object_handle_unreference_unlocked(obj);
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out_put:
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dma_buf_put(dma_buf);
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mutex_unlock(&file_priv->prime.lock);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
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int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_prime_handle *args = data;
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uint32_t flags;
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if (!drm_core_check_feature(dev, DRIVER_PRIME))
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return -EINVAL;
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if (!dev->driver->prime_handle_to_fd)
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return -ENOSYS;
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/* check flags are valid */
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if (args->flags & ~DRM_CLOEXEC)
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return -EINVAL;
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/* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */
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flags = args->flags & DRM_CLOEXEC;
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return dev->driver->prime_handle_to_fd(dev, file_priv,
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args->handle, flags, &args->fd);
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}
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int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_prime_handle *args = data;
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if (!drm_core_check_feature(dev, DRIVER_PRIME))
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return -EINVAL;
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if (!dev->driver->prime_fd_to_handle)
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return -ENOSYS;
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return dev->driver->prime_fd_to_handle(dev, file_priv,
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args->fd, &args->handle);
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}
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/*
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* drm_prime_pages_to_sg
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*
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* this helper creates an sg table object from a set of pages
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* the driver is responsible for mapping the pages into the
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* importers address space
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*/
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struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages)
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{
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struct sg_table *sg = NULL;
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struct scatterlist *iter;
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int i;
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int ret;
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sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
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if (!sg)
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goto out;
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ret = sg_alloc_table(sg, nr_pages, GFP_KERNEL);
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if (ret)
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goto out;
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for_each_sg(sg->sgl, iter, nr_pages, i)
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sg_set_page(iter, pages[i], PAGE_SIZE, 0);
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return sg;
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out:
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kfree(sg);
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return NULL;
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}
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EXPORT_SYMBOL(drm_prime_pages_to_sg);
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2012-05-18 08:40:33 -06:00
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/* export an sg table into an array of pages and addresses
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this is currently required by the TTM driver in order to do correct fault
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handling */
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int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
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dma_addr_t *addrs, int max_pages)
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{
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unsigned count;
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struct scatterlist *sg;
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struct page *page;
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u32 len, offset;
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int pg_index;
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dma_addr_t addr;
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pg_index = 0;
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for_each_sg(sgt->sgl, sg, sgt->nents, count) {
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len = sg->length;
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offset = sg->offset;
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page = sg_page(sg);
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addr = sg_dma_address(sg);
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while (len > 0) {
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if (WARN_ON(pg_index >= max_pages))
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return -1;
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pages[pg_index] = page;
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if (addrs)
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addrs[pg_index] = addr;
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page++;
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addr += PAGE_SIZE;
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len -= PAGE_SIZE;
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pg_index++;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
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2011-11-25 08:21:02 -07:00
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/* helper function to cleanup a GEM/prime object */
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void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
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{
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struct dma_buf_attachment *attach;
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struct dma_buf *dma_buf;
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attach = obj->import_attach;
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if (sg)
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dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
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dma_buf = attach->dmabuf;
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dma_buf_detach(attach->dmabuf, attach);
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/* remove the reference */
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dma_buf_put(dma_buf);
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}
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EXPORT_SYMBOL(drm_prime_gem_destroy);
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void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
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{
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INIT_LIST_HEAD(&prime_fpriv->head);
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mutex_init(&prime_fpriv->lock);
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}
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EXPORT_SYMBOL(drm_prime_init_file_private);
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void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
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{
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struct drm_prime_member *member, *safe;
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list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) {
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list_del(&member->entry);
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kfree(member);
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}
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}
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EXPORT_SYMBOL(drm_prime_destroy_file_private);
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int drm_prime_add_imported_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle)
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{
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struct drm_prime_member *member;
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member = kmalloc(sizeof(*member), GFP_KERNEL);
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if (!member)
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return -ENOMEM;
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member->dma_buf = dma_buf;
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member->handle = handle;
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list_add(&member->entry, &prime_fpriv->head);
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return 0;
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}
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EXPORT_SYMBOL(drm_prime_add_imported_buf_handle);
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int drm_prime_lookup_imported_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle)
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{
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struct drm_prime_member *member;
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list_for_each_entry(member, &prime_fpriv->head, entry) {
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if (member->dma_buf == dma_buf) {
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*handle = member->handle;
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return 0;
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}
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL(drm_prime_lookup_imported_buf_handle);
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void drm_prime_remove_imported_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf)
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{
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struct drm_prime_member *member, *safe;
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mutex_lock(&prime_fpriv->lock);
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list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) {
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if (member->dma_buf == dma_buf) {
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list_del(&member->entry);
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kfree(member);
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}
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}
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mutex_unlock(&prime_fpriv->lock);
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}
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EXPORT_SYMBOL(drm_prime_remove_imported_buf_handle);
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