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Date: Mon, 17 Feb 2014 11:46:16 -0500
From: Rob Clark <robdclark@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...onical.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arch@...r.kernel.org, Colin Cross <ccross@...gle.com>,
"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Daniel Vetter <daniel@...ll.ch>,
Sumit Semwal <sumit.semwal@...aro.org>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Subject: Re: [PATCH 3/6] dma-buf: use reservation objects
On Mon, Feb 17, 2014 at 10:56 AM, Maarten Lankhorst
<maarten.lankhorst@...onical.com> wrote:
> 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@...onical.com>
> Acked-by: Mauro Carvalho Chehab <m.chehab@...sung.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);
well, you could hook up msm_gem_prime_res_obj too (since I already
have a resv obj in 'struct msm_gem_object' ;-)
That said, I wonder if maybe we just want to promote the 'struct
reservation_object' ptr into 'struct drm_gem_object' so we can have a
common get_prime_res_obj fxn for everyone using GEM?
Anyways, that only matters within drivers/gpu/drm so easy enough to
change it later.. so for the drm/fence/reservation/dmabuf bits:
Reviewed-by: Rob Clark <robdclark@...il.com>
> +
> + 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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