* Userspace can query the state of these implicitly tracked fences using poll()
* and related system calls:
*
- * - Checking for POLLIN, i.e. read access, can be use to query the state of the
+ * - Checking for EPOLLIN, i.e. read access, can be use to query the state of the
* most recent write or exclusive fence.
*
- * - Checking for POLLOUT, i.e. write access, can be used to query the state of
+ * - Checking for EPOLLOUT, i.e. write access, can be used to query the state of
* all attached fences, shared and exclusive ones.
*
* Note that this only signals the completion of the respective fences, i.e. the
dmabuf = file->private_data;
if (!dmabuf || !dmabuf->resv)
- return POLLERR;
+ return EPOLLERR;
resv = dmabuf->resv;
poll_wait(file, &dmabuf->poll, poll);
- events = poll_requested_events(poll) & (POLLIN | POLLOUT);
+ events = poll_requested_events(poll) & (EPOLLIN | EPOLLOUT);
if (!events)
return 0;
goto retry;
}
- if (fence_excl && (!(events & POLLOUT) || shared_count == 0)) {
+ if (fence_excl && (!(events & EPOLLOUT) || shared_count == 0)) {
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_excl;
- __poll_t pevents = POLLIN;
+ __poll_t pevents = EPOLLIN;
if (shared_count == 0)
- pevents |= POLLOUT;
+ pevents |= EPOLLOUT;
spin_lock_irq(&dmabuf->poll.lock);
if (dcb->active) {
}
}
- if ((events & POLLOUT) && shared_count > 0) {
+ if ((events & EPOLLOUT) && shared_count > 0) {
struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_shared;
int i;
/* Only queue a new callback if no event has fired yet */
spin_lock_irq(&dmabuf->poll.lock);
if (dcb->active)
- events &= ~POLLOUT;
+ events &= ~EPOLLOUT;
else
- dcb->active = POLLOUT;
+ dcb->active = EPOLLOUT;
spin_unlock_irq(&dmabuf->poll.lock);
- if (!(events & POLLOUT))
+ if (!(events & EPOLLOUT))
goto out;
for (i = 0; i < shared_count; ++i) {
*
* call dma_buf_poll_cb and force a recheck!
*/
- events &= ~POLLOUT;
+ events &= ~EPOLLOUT;
dma_buf_poll_cb(NULL, &dcb->cb);
break;
}
if (!dma_fence_add_callback(fence, &dcb->cb,
dma_buf_poll_cb)) {
dma_fence_put(fence);
- events &= ~POLLOUT;
+ events &= ~EPOLLOUT;
break;
}
dma_fence_put(fence);
|| !exp_info->ops->map_dma_buf
|| !exp_info->ops->unmap_dma_buf
|| !exp_info->ops->release
- || !exp_info->ops->map_atomic
|| !exp_info->ops->map
|| !exp_info->ops->mmap)) {
return ERR_PTR(-EINVAL);
mutex_lock(&dmabuf->lock);
if (dmabuf->ops->attach) {
- ret = dmabuf->ops->attach(dmabuf, dev, attach);
+ ret = dmabuf->ops->attach(dmabuf, attach);
if (ret)
goto err_attach;
}
* void \*dma_buf_kmap(struct dma_buf \*, unsigned long);
* void dma_buf_kunmap(struct dma_buf \*, unsigned long, void \*);
*
- * There are also atomic variants of these interfaces. Like for kmap they
- * facilitate non-blocking fast-paths. Neither the importer nor the exporter
- * (in the callback) is allowed to block when using these.
- *
- * Interfaces::
- * void \*dma_buf_kmap_atomic(struct dma_buf \*, unsigned long);
- * void dma_buf_kunmap_atomic(struct dma_buf \*, unsigned long, void \*);
- *
- * For importers all the restrictions of using kmap apply, like the limited
- * supply of kmap_atomic slots. Hence an importer shall only hold onto at
- * max 2 atomic dma_buf kmaps at the same time (in any given process context).
+ * Implementing the functions is optional for exporters and for importers all
+ * the restrictions of using kmap apply.
*
* dma_buf kmap calls outside of the range specified in begin_cpu_access are
* undefined. If the range is not PAGE_SIZE aligned, kmap needs to succeed on
* the partial chunks at the beginning and end but may return stale or bogus
* data outside of the range (in these partial chunks).
*
- * Note that these calls need to always succeed. The exporter needs to
- * complete any preparations that might fail in begin_cpu_access.
- *
* For some cases the overhead of kmap can be too high, a vmap interface
* is introduced. This interface should be used very carefully, as vmalloc
* space is a limited resources on many architectures.
}
EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);
-/**
- * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address
- * space. The same restrictions as for kmap_atomic and friends apply.
- * @dmabuf: [in] buffer to map page from.
- * @page_num: [in] page in PAGE_SIZE units to map.
- *
- * This call must always succeed, any necessary preparations that might fail
- * need to be done in begin_cpu_access.
- */
-void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num)
-{
- WARN_ON(!dmabuf);
-
- return dmabuf->ops->map_atomic(dmabuf, page_num);
-}
-EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic);
-
-/**
- * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic.
- * @dmabuf: [in] buffer to unmap page from.
- * @page_num: [in] page in PAGE_SIZE units to unmap.
- * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic.
- *
- * This call must always succeed.
- */
-void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num,
- void *vaddr)
-{
- WARN_ON(!dmabuf);
-
- if (dmabuf->ops->unmap_atomic)
- dmabuf->ops->unmap_atomic(dmabuf, page_num, vaddr);
-}
-EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic);
-
/**
* dma_buf_kmap - Map a page of the buffer object into kernel address space. The
* same restrictions as for kmap and friends apply.
{
WARN_ON(!dmabuf);
+ if (!dmabuf->ops->map)
+ return NULL;
return dmabuf->ops->map(dmabuf, page_num);
}
EXPORT_SYMBOL_GPL(dma_buf_kmap);
git.samba.org / sfrench / cifs-2.6.git / blobdiff