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| author | Maarten Lankhorst <maarten.lankhorst@canonical.com> | 2014-07-01 12:57:26 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-08 13:03:20 -0700 |
| commit | 3aac4502fd3f80dcf7e65dbf6edd8676893c1f46 (patch) | |
| tree | 16d7554b57ed1b2a63f7d80d67acee5c8b3ab92c /drivers/dma-buf/dma-buf.c | |
| parent | 606b23ad609c71cfb37eeb972ea4c901034edd3c (diff) | |
| download | linux-3aac4502fd3f80dcf7e65dbf6edd8676893c1f46.tar.gz | |
dma-buf: use reservation objects
This allows reservation objects to be used in dma-buf. it's required for implementing polling support on the fences that belong to a dma-buf. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Acked-by: Mauro Carvalho Chehab <m.chehab@samsung.com> #drivers/media/v4l2-core/ Acked-by: Thomas Hellstrom <thellstrom@vmware.com> #drivers/gpu/drm/ttm Acked-by: Sumit Semwal <sumit.semwal@linaro.org> Acked-by: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net> #drivers/gpu/drm/armada/ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/dma-buf/dma-buf.c')
| -rw-r--r-- | drivers/dma-buf/dma-buf.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 840c7fa80983..cd40ca22911f 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -25,10 +25,12 @@ #include <linux/fs.h> #include <linux/slab.h> #include <linux/dma-buf.h> +#include <linux/fence.h> #include <linux/anon_inodes.h> #include <linux/export.h> #include <linux/debugfs.h> #include <linux/seq_file.h> +#include <linux/reservation.h> static inline int is_dma_buf_file(struct file *); @@ -56,6 +58,9 @@ static int dma_buf_release(struct inode *inode, struct file *file) list_del(&dmabuf->list_node); mutex_unlock(&db_list.lock); + if (dmabuf->resv == (struct reservation_object *)&dmabuf[1]) + reservation_object_fini(dmabuf->resv); + kfree(dmabuf); return 0; } @@ -128,6 +133,7 @@ static inline int is_dma_buf_file(struct file *file) * @size: [in] Size of the buffer * @flags: [in] mode flags for the file. * @exp_name: [in] name of the exporting module - useful for debugging. + * @resv: [in] reservation-object, NULL to allocate default one. * * Returns, on success, a newly created dma_buf object, which wraps the * supplied private data and operations for dma_buf_ops. On either missing @@ -135,10 +141,17 @@ static inline int is_dma_buf_file(struct file *file) * */ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, - size_t size, int flags, const char *exp_name) + size_t size, int flags, const char *exp_name, + struct reservation_object *resv) { struct dma_buf *dmabuf; struct file *file; + size_t alloc_size = sizeof(struct dma_buf); + if (!resv) + alloc_size += sizeof(struct reservation_object); + else + /* prevent &dma_buf[1] == dma_buf->resv */ + alloc_size += 1; if (WARN_ON(!priv || !ops || !ops->map_dma_buf @@ -150,7 +163,7 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, return ERR_PTR(-EINVAL); } - dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL); + dmabuf = kzalloc(alloc_size, GFP_KERNEL); if (dmabuf == NULL) return ERR_PTR(-ENOMEM); @@ -158,6 +171,11 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, dmabuf->ops = ops; dmabuf->size = size; dmabuf->exp_name = exp_name; + if (!resv) { + resv = (struct reservation_object *)&dmabuf[1]; + reservation_object_init(resv); + } + dmabuf->resv = resv; file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); if (IS_ERR(file)) { |