![Imre Deak](/assets/img/avatar_default.png)
drm_gem_release should release all handles connected to the drm file and so should also release the prime lookup entries of these handles. So just WARN if this isn't the case. Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
540 lines
14 KiB
C
540 lines
14 KiB
C
/*
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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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#include <drm/drmP.h>
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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. Prime will do this automatically for drivers that
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* use the drm_gem_prime_{import,export} helpers.
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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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static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle);
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static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
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enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = attach->dmabuf->priv;
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struct sg_table *sgt;
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mutex_lock(&obj->dev->struct_mutex);
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sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
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if (!IS_ERR_OR_NULL(sgt))
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dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
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mutex_unlock(&obj->dev->struct_mutex);
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return sgt;
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}
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static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *sgt, enum dma_data_direction dir)
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{
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dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
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sg_free_table(sgt);
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kfree(sgt);
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}
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static void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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if (obj->export_dma_buf == dma_buf) {
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/* drop the reference on the export fd holds */
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obj->export_dma_buf = NULL;
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drm_gem_object_unreference_unlocked(obj);
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}
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}
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static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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return dev->driver->gem_prime_vmap(obj);
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}
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static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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dev->driver->gem_prime_vunmap(obj, vaddr);
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}
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static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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return NULL;
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}
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static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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}
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static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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return NULL;
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}
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static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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}
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static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
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struct vm_area_struct *vma)
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{
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return -EINVAL;
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}
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static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
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.map_dma_buf = drm_gem_map_dma_buf,
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.unmap_dma_buf = drm_gem_unmap_dma_buf,
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.release = drm_gem_dmabuf_release,
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.kmap = drm_gem_dmabuf_kmap,
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.kmap_atomic = drm_gem_dmabuf_kmap_atomic,
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.kunmap = drm_gem_dmabuf_kunmap,
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.kunmap_atomic = drm_gem_dmabuf_kunmap_atomic,
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.mmap = drm_gem_dmabuf_mmap,
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.vmap = drm_gem_dmabuf_vmap,
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.vunmap = drm_gem_dmabuf_vunmap,
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};
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/**
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* DOC: PRIME Helpers
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*
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* Drivers can implement @gem_prime_export and @gem_prime_import in terms of
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* simpler APIs by using the helper functions @drm_gem_prime_export and
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* @drm_gem_prime_import. These functions implement dma-buf support in terms of
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* five lower-level driver callbacks:
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*
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* Export callbacks:
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*
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* - @gem_prime_pin (optional): prepare a GEM object for exporting
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*
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* - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
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*
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* - @gem_prime_vmap: vmap a buffer exported by your driver
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*
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* - @gem_prime_vunmap: vunmap a buffer exported by your driver
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*
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* Import callback:
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*
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* - @gem_prime_import_sg_table (import): produce a GEM object from another
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* driver's scatter/gather table
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*/
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struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
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struct drm_gem_object *obj, int flags)
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{
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if (dev->driver->gem_prime_pin) {
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int ret = dev->driver->gem_prime_pin(obj);
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if (ret)
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return ERR_PTR(ret);
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}
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return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size,
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0600);
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}
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EXPORT_SYMBOL(drm_gem_prime_export);
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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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int ret = 0;
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struct dma_buf *dmabuf;
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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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dmabuf = obj->import_attach->dmabuf;
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goto out_have_obj;
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}
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if (obj->export_dma_buf) {
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dmabuf = obj->export_dma_buf;
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goto out_have_obj;
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}
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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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ret = PTR_ERR(buf);
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goto out;
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}
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obj->export_dma_buf = buf;
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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_buf_handle(&file_priv->prime,
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obj->export_dma_buf, handle);
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if (ret)
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goto out;
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*prime_fd = dma_buf_fd(buf, flags);
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mutex_unlock(&file_priv->prime.lock);
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return 0;
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out_have_obj:
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get_dma_buf(dmabuf);
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*prime_fd = dma_buf_fd(dmabuf, flags);
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out:
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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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EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
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struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf)
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{
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struct dma_buf_attachment *attach;
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struct sg_table *sgt;
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struct drm_gem_object *obj;
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int ret;
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if (!dev->driver->gem_prime_import_sg_table)
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return ERR_PTR(-EINVAL);
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if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) {
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obj = dma_buf->priv;
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if (obj->dev == dev) {
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/*
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* Importing dmabuf exported from out own gem increases
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* refcount on gem itself instead of f_count of dmabuf.
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*/
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drm_gem_object_reference(obj);
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return obj;
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}
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}
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attach = dma_buf_attach(dma_buf, dev->dev);
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if (IS_ERR(attach))
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return ERR_PTR(PTR_ERR(attach));
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get_dma_buf(dma_buf);
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sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
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if (IS_ERR_OR_NULL(sgt)) {
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ret = PTR_ERR(sgt);
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goto fail_detach;
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}
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obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt);
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if (IS_ERR(obj)) {
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ret = PTR_ERR(obj);
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goto fail_unmap;
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}
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obj->import_attach = attach;
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return obj;
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fail_unmap:
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dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
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fail_detach:
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dma_buf_detach(dma_buf, attach);
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dma_buf_put(dma_buf);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL(drm_gem_prime_import);
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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_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_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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dma_buf_put(dma_buf);
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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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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_from_pages(sg, pages, nr_pages, 0,
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nr_pages << PAGE_SHIFT, GFP_KERNEL);
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if (ret)
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goto out;
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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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/* 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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/* 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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/* by now drm_gem_release should've made sure the list is empty */
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WARN_ON(!list_empty(&prime_fpriv->head));
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}
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EXPORT_SYMBOL(drm_prime_destroy_file_private);
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static int drm_prime_add_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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get_dma_buf(dma_buf);
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|
member->dma_buf = dma_buf;
|
|
member->handle = handle;
|
|
list_add(&member->entry, &prime_fpriv->head);
|
|
return 0;
|
|
}
|
|
|
|
int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle)
|
|
{
|
|
struct drm_prime_member *member;
|
|
|
|
list_for_each_entry(member, &prime_fpriv->head, entry) {
|
|
if (member->dma_buf == dma_buf) {
|
|
*handle = member->handle;
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_lookup_buf_handle);
|
|
|
|
void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf)
|
|
{
|
|
struct drm_prime_member *member, *safe;
|
|
|
|
mutex_lock(&prime_fpriv->lock);
|
|
list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) {
|
|
if (member->dma_buf == dma_buf) {
|
|
dma_buf_put(dma_buf);
|
|
list_del(&member->entry);
|
|
kfree(member);
|
|
}
|
|
}
|
|
mutex_unlock(&prime_fpriv->lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_remove_buf_handle);
|