[PATCH 3/6] dma-buf: use reservation objects (original) (raw)

Maarten Lankhorst maarten.lankhorst at canonical.com
Mon Feb 17 07:56:34 PST 2014

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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 at canonical.com> Acked-by: Mauro Carvalho Chehab <m.chehab at samsung.com> #drivers/media/v4l2-core/

drivers/base/dma-buf.c | 22 ++++++++++++++++++++-- drivers/gpu/drm/drm_prime.c | 8 +++++++- drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 2 +- drivers/gpu/drm/i915/i915_gem_dmabuf.c | 2 +- drivers/gpu/drm/nouveau/nouveau_drm.c | 1 + drivers/gpu/drm/nouveau/nouveau_gem.h | 1 + drivers/gpu/drm/nouveau/nouveau_prime.c | 7 +++++++ drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 2 +- drivers/gpu/drm/radeon/radeon_drv.c | 2 ++ drivers/gpu/drm/radeon/radeon_prime.c | 8 ++++++++ drivers/gpu/drm/ttm/ttm_object.c | 2 +- drivers/media/v4l2-core/videobuf2-dma-contig.c | 2 +- include/drm/drmP.h | 2 ++ include/linux/dma-buf.h | 9 ++++++--- 14 files changed, 59 insertions(+), 11 deletions(-)

diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c index 1e16cbd61da2..85e792c2c909 100644 --- a/drivers/base/dma-buf.c +++ b/drivers/base/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)) {

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 56805c39c906..a13e90245adf 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -318,7 +318,13 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { struct dma_buf *drm_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags) { - return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, flags); + struct reservation_object *robj = NULL; + + if (dev->driver->gem_prime_res_obj) + robj = dev->driver->gem_prime_res_obj(obj); + + return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, + flags, robj); } EXPORT_SYMBOL(drm_gem_prime_export);

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c index 59827cc5e770..b5e89f46326e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c @@ -187,7 +187,7 @@ struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev, struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);

 return dma_buf_export(obj, &exynos_dmabuf_ops,

        exynos_gem_obj->base.size, flags);

```
        exynos_gem_obj->base.size, flags, NULL);
```
}

struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,

diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 9bb533e0d762..ea66f40e95b3 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -233,7 +233,7 @@ static const struct dma_buf_ops i915_dmabuf_ops = { struct dma_buf *i915_gem_prime_export(struct drm_device *dev, struct drm_gem_object *gem_obj, int flags) { - return dma_buf_export(gem_obj, &i915_dmabuf_ops, gem_obj->size, flags); + return dma_buf_export(gem_obj, &i915_dmabuf_ops, gem_obj->size, flags, NULL); }

static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c index 78c8e7146d56..2a15c8e8d199 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drm.c +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c @@ -816,6 +816,7 @@ driver = { .gem_prime_export = drm_gem_prime_export, .gem_prime_import = drm_gem_prime_import, .gem_prime_pin = nouveau_gem_prime_pin, + .gem_prime_res_obj = nouveau_gem_prime_res_obj, .gem_prime_unpin = nouveau_gem_prime_unpin, .gem_prime_get_sg_table = nouveau_gem_prime_get_sg_table, .gem_prime_import_sg_table = nouveau_gem_prime_import_sg_table, diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.h b/drivers/gpu/drm/nouveau/nouveau_gem.h index 7caca057bc38..ddab762d81fe 100644 --- a/drivers/gpu/drm/nouveau/nouveau_gem.h +++ b/drivers/gpu/drm/nouveau/nouveau_gem.h @@ -35,6 +35,7 @@ extern int nouveau_gem_ioctl_info(struct drm_device *, void *, struct drm_file *);

extern int nouveau_gem_prime_pin(struct drm_gem_object *); +struct reservation_object *nouveau_gem_prime_res_obj(struct drm_gem_object *); extern void nouveau_gem_prime_unpin(struct drm_gem_object *); extern struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *); extern struct drm_gem_object *nouveau_gem_prime_import_sg_table( diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c index 51a2cb102b44..1f51008e4d26 100644 --- a/drivers/gpu/drm/nouveau/nouveau_prime.c +++ b/drivers/gpu/drm/nouveau/nouveau_prime.c @@ -102,3 +102,10 @@ void nouveau_gem_prime_unpin(struct drm_gem_object *obj)

 nouveau_bo_unpin(nvbo);

} + +struct reservation_object *nouveau_gem_prime_res_obj(struct drm_gem_object *obj) +{ + struct nouveau_bo *nvbo = nouveau_gem_object(obj); + + return nvbo->bo.resv; +} diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index 4fcca8d42796..a2dbfb1737b4 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -171,7 +171,7 @@ static struct dma_buf_ops omap_dmabuf_ops = { struct dma_buf *omap_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags) { - return dma_buf_export(obj, &omap_dmabuf_ops, obj->size, flags); + return dma_buf_export(obj, &omap_dmabuf_ops, obj->size, flags, NULL); }

struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev, diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c index 84a1bbb75f91..c15c1a1996fc 100644 --- a/drivers/gpu/drm/radeon/radeon_drv.c +++ b/drivers/gpu/drm/radeon/radeon_drv.c @@ -128,6 +128,7 @@ struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev, struct sg_table *sg); int radeon_gem_prime_pin(struct drm_gem_object *obj); void radeon_gem_prime_unpin(struct drm_gem_object *obj); +struct reservation_object *radeon_gem_prime_res_obj(struct drm_gem_object *); void *radeon_gem_prime_vmap(struct drm_gem_object *obj); void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr); extern long radeon_kms_compat_ioctl(struct file *filp, unsigned int cmd, @@ -561,6 +562,7 @@ static struct drm_driver kms_driver = { .gem_prime_import = drm_gem_prime_import, .gem_prime_pin = radeon_gem_prime_pin, .gem_prime_unpin = radeon_gem_prime_unpin, + .gem_prime_res_obj = radeon_gem_prime_res_obj, .gem_prime_get_sg_table = radeon_gem_prime_get_sg_table, .gem_prime_import_sg_table = radeon_gem_prime_import_sg_table, .gem_prime_vmap = radeon_gem_prime_vmap, diff --git a/drivers/gpu/drm/radeon/radeon_prime.c b/drivers/gpu/drm/radeon/radeon_prime.c index 20074560fc25..28d71070c389 100644 --- a/drivers/gpu/drm/radeon/radeon_prime.c +++ b/drivers/gpu/drm/radeon/radeon_prime.c @@ -103,3 +103,11 @@ void radeon_gem_prime_unpin(struct drm_gem_object *obj) radeon_bo_unpin(bo); radeon_bo_unreserve(bo); } + + +struct reservation_object *radeon_gem_prime_res_obj(struct drm_gem_object *obj) +{ + struct radeon_bo *bo = gem_to_radeon_bo(obj); + + return bo->tbo.resv; +} diff --git a/drivers/gpu/drm/ttm/ttm_object.c b/drivers/gpu/drm/ttm/ttm_object.c index 53b51c4e671a..d06f29bd2124 100644 --- a/drivers/gpu/drm/ttm/ttm_object.c +++ b/drivers/gpu/drm/ttm/ttm_object.c @@ -649,7 +649,7 @@ int ttm_prime_handle_to_fd(struct ttm_object_file *tfile, }

     dma_buf = dma_buf_export(prime, &tdev->ops,

```
            prime->size, flags);
```

            prime->size, flags, NULL);
    if (IS_ERR(dma_buf)) {
        ret = PTR_ERR(dma_buf);
        ttm_mem_global_free(tdev->mem_glob,

diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c index 33d3871d1e13..93bd2230ab0b 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -404,7 +404,7 @@ static struct dma_buf *vb2_dc_get_dmabuf(void *buf_priv, unsigned long flags) if (WARN_ON(!buf->sgt_base)) return NULL;

dbuf = dma_buf_export(buf, &vb2_dc_dmabuf_ops, buf->size, flags);

dbuf = dma_buf_export(buf, &vb2_dc_dmabuf_ops, buf->size, flags, NULL); if (IS_ERR(dbuf)) return NULL;

diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 04a7f31301f8..902d3abdd9f9 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -82,6 +82,7 @@ struct drm_device;

struct device_node; struct videomode; +struct reservation_object;

#include <drm/drm_os_linux.h> #include <drm/drm_hashtab.h> @@ -959,6 +960,7 @@ struct drm_driver { /* low-level interface used by drm_gem_prime_{import,export} */ int (*gem_prime_pin)(struct drm_gem_object *obj); void (*gem_prime_unpin)(struct drm_gem_object *obj); + struct reservation_object *(*gem_prime_res_obj)(struct drm_gem_object *); struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj); struct drm_gem_object *(*gem_prime_import_sg_table)( struct drm_device *dev, size_t size, diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index dfac5ed31120..34cfbac52c03 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -115,6 +115,7 @@ struct dma_buf_ops {

@exp_name: name of the exporter; useful for debugging.
@list_node: node for dma_buf accounting and debugging.
@priv: exporter specific private data for this buffer object.

- @resv: reservation object linked to this dma-buf */ struct dma_buf { size_t size; @@ -128,6 +129,7 @@ struct dma_buf { const char *exp_name; struct list_head list_node; void *priv;
struct reservation_object *resv; };

/**

@@ -168,10 +170,11 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *dmabuf_attach);

struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, - size_t size, int flags, const char *); + size_t size, int flags, const char *, + struct reservation_object *);

-#define dma_buf_export(priv, ops, size, flags)
- dma_buf_export_named(priv, ops, size, flags, FILE) +#define dma_buf_export(priv, ops, size, flags, resv)
+ dma_buf_export_named(priv, ops, size, flags, FILE, resv)

int dma_buf_fd(struct dma_buf *dmabuf, int flags); struct dma_buf *dma_buf_get(int fd);

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