diff mbox series

[RESEND,3/3] dma-buf: heaps: Rework heep allocation hooks to return struct dma_buf instead of fd

Message ID 20210119204508.9256-3-john.stultz@linaro.org
State Accepted
Commit abf4451b340b09f797c87341b3010f95af9215c0
Headers show
Series [RESEND,1/3] dma-buf: system_heap: Make sure to return an error if we abort | expand

Commit Message

John Stultz Jan. 19, 2021, 8:45 p.m. UTC
Every heap needs to create a dmabuf and then export it to a fd
via dma_buf_fd(), so to consolidate things a bit, have the heaps
just return a struct dmabuf * and let the top level
dma_heap_buffer_alloc() call handle creating the fd via
dma_buf_fd().

Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Laura Abbott <labbott@kernel.org>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: Daniel Mentz <danielmentz@google.com>
Cc: Chris Goldsworthy <cgoldswo@codeaurora.org>
Cc: Ørjan Eide <orjan.eide@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Ezequiel Garcia <ezequiel@collabora.com>
Cc: Simon Ser <contact@emersion.fr>
Cc: James Jones <jajones@nvidia.com>
Cc: linux-media@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/dma-buf/dma-heap.c          | 14 +++++++++++++-
 drivers/dma-buf/heaps/cma_heap.c    | 22 +++++++---------------
 drivers/dma-buf/heaps/system_heap.c | 21 +++++++--------------
 include/linux/dma-heap.h            | 12 ++++++------
 4 files changed, 33 insertions(+), 36 deletions(-)

Comments

Sumit Semwal Jan. 21, 2021, 1:37 p.m. UTC | #1
Hi John,

On Wed, 20 Jan 2021 at 02:15, John Stultz <john.stultz@linaro.org> wrote:
>
> Every heap needs to create a dmabuf and then export it to a fd
> via dma_buf_fd(), so to consolidate things a bit, have the heaps
> just return a struct dmabuf * and let the top level
> dma_heap_buffer_alloc() call handle creating the fd via
> dma_buf_fd().

Thanks for the patch! LGTM, feels a lot neater now. I'll merge into
drm-misc-next.
>
> Cc: Sumit Semwal <sumit.semwal@linaro.org>
> Cc: Liam Mark <lmark@codeaurora.org>
> Cc: Laura Abbott <labbott@kernel.org>
> Cc: Brian Starkey <Brian.Starkey@arm.com>
> Cc: Hridya Valsaraju <hridya@google.com>
> Cc: Suren Baghdasaryan <surenb@google.com>
> Cc: Sandeep Patil <sspatil@google.com>
> Cc: Daniel Mentz <danielmentz@google.com>
> Cc: Chris Goldsworthy <cgoldswo@codeaurora.org>
> Cc: Ørjan Eide <orjan.eide@arm.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Cc: Ezequiel Garcia <ezequiel@collabora.com>
> Cc: Simon Ser <contact@emersion.fr>
> Cc: James Jones <jajones@nvidia.com>
> Cc: linux-media@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> ---
>  drivers/dma-buf/dma-heap.c          | 14 +++++++++++++-
>  drivers/dma-buf/heaps/cma_heap.c    | 22 +++++++---------------
>  drivers/dma-buf/heaps/system_heap.c | 21 +++++++--------------
>  include/linux/dma-heap.h            | 12 ++++++------
>  4 files changed, 33 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
> index afd22c9dbdcf..6b5db954569f 100644
> --- a/drivers/dma-buf/dma-heap.c
> +++ b/drivers/dma-buf/dma-heap.c
> @@ -52,6 +52,9 @@ static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
>                                  unsigned int fd_flags,
>                                  unsigned int heap_flags)
>  {
> +       struct dma_buf *dmabuf;
> +       int fd;
> +
>         /*
>          * Allocations from all heaps have to begin
>          * and end on page boundaries.
> @@ -60,7 +63,16 @@ static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
>         if (!len)
>                 return -EINVAL;
>
> -       return heap->ops->allocate(heap, len, fd_flags, heap_flags);
> +       dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags);
> +       if (IS_ERR(dmabuf))
> +               return PTR_ERR(dmabuf);
> +
> +       fd = dma_buf_fd(dmabuf, fd_flags);
> +       if (fd < 0) {
> +               dma_buf_put(dmabuf);
> +               /* just return, as put will call release and that will free */
> +       }
> +       return fd;
>  }
>
>  static int dma_heap_open(struct inode *inode, struct file *file)
> diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
> index 0c76cbc3fb11..985c41ffd85b 100644
> --- a/drivers/dma-buf/heaps/cma_heap.c
> +++ b/drivers/dma-buf/heaps/cma_heap.c
> @@ -272,10 +272,10 @@ static const struct dma_buf_ops cma_heap_buf_ops = {
>         .release = cma_heap_dma_buf_release,
>  };
>
> -static int cma_heap_allocate(struct dma_heap *heap,
> -                                 unsigned long len,
> -                                 unsigned long fd_flags,
> -                                 unsigned long heap_flags)
> +static struct dma_buf *cma_heap_allocate(struct dma_heap *heap,
> +                                        unsigned long len,
> +                                        unsigned long fd_flags,
> +                                        unsigned long heap_flags)
>  {
>         struct cma_heap *cma_heap = dma_heap_get_drvdata(heap);
>         struct cma_heap_buffer *buffer;
> @@ -290,7 +290,7 @@ static int cma_heap_allocate(struct dma_heap *heap,
>
>         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
>         if (!buffer)
> -               return -ENOMEM;
> +               return ERR_PTR(-ENOMEM);
>
>         INIT_LIST_HEAD(&buffer->attachments);
>         mutex_init(&buffer->lock);
> @@ -349,15 +349,7 @@ static int cma_heap_allocate(struct dma_heap *heap,
>                 ret = PTR_ERR(dmabuf);
>                 goto free_pages;
>         }
> -
> -       ret = dma_buf_fd(dmabuf, fd_flags);
> -       if (ret < 0) {
> -               dma_buf_put(dmabuf);
> -               /* just return, as put will call release and that will free */
> -               return ret;
> -       }
> -
> -       return ret;
> +       return dmabuf;
>
>  free_pages:
>         kfree(buffer->pages);
> @@ -366,7 +358,7 @@ static int cma_heap_allocate(struct dma_heap *heap,
>  free_buffer:
>         kfree(buffer);
>
> -       return ret;
> +       return ERR_PTR(ret);
>  }
>
>  static const struct dma_heap_ops cma_heap_ops = {
> diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
> index 2321c91891f6..7b154424aeb3 100644
> --- a/drivers/dma-buf/heaps/system_heap.c
> +++ b/drivers/dma-buf/heaps/system_heap.c
> @@ -332,10 +332,10 @@ static struct page *alloc_largest_available(unsigned long size,
>         return NULL;
>  }
>
> -static int system_heap_allocate(struct dma_heap *heap,
> -                               unsigned long len,
> -                               unsigned long fd_flags,
> -                               unsigned long heap_flags)
> +static struct dma_buf *system_heap_allocate(struct dma_heap *heap,
> +                                           unsigned long len,
> +                                           unsigned long fd_flags,
> +                                           unsigned long heap_flags)
>  {
>         struct system_heap_buffer *buffer;
>         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> @@ -350,7 +350,7 @@ static int system_heap_allocate(struct dma_heap *heap,
>
>         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
>         if (!buffer)
> -               return -ENOMEM;
> +               return ERR_PTR(-ENOMEM);
>
>         INIT_LIST_HEAD(&buffer->attachments);
>         mutex_init(&buffer->lock);
> @@ -400,14 +400,7 @@ static int system_heap_allocate(struct dma_heap *heap,
>                 ret = PTR_ERR(dmabuf);
>                 goto free_pages;
>         }
> -
> -       ret = dma_buf_fd(dmabuf, fd_flags);
> -       if (ret < 0) {
> -               dma_buf_put(dmabuf);
> -               /* just return, as put will call release and that will free */
> -               return ret;
> -       }
> -       return ret;
> +       return dmabuf;
>
>  free_pages:
>         for_each_sgtable_sg(table, sg, i) {
> @@ -421,7 +414,7 @@ static int system_heap_allocate(struct dma_heap *heap,
>                 __free_pages(page, compound_order(page));
>         kfree(buffer);
>
> -       return ret;
> +       return ERR_PTR(ret);
>  }
>
>  static const struct dma_heap_ops system_heap_ops = {
> diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
> index 454e354d1ffb..5bc5c946af58 100644
> --- a/include/linux/dma-heap.h
> +++ b/include/linux/dma-heap.h
> @@ -16,15 +16,15 @@ struct dma_heap;
>
>  /**
>   * struct dma_heap_ops - ops to operate on a given heap
> - * @allocate:          allocate dmabuf and return fd
> + * @allocate:          allocate dmabuf and return struct dma_buf ptr
>   *
> - * allocate returns dmabuf fd  on success, -errno on error.
> + * allocate returns dmabuf on success, ERR_PTR(-errno) on error.
>   */
>  struct dma_heap_ops {
> -       int (*allocate)(struct dma_heap *heap,
> -                       unsigned long len,
> -                       unsigned long fd_flags,
> -                       unsigned long heap_flags);
> +       struct dma_buf *(*allocate)(struct dma_heap *heap,
> +                                   unsigned long len,
> +                                   unsigned long fd_flags,
> +                                   unsigned long heap_flags);
>  };
>
>  /**
> --
> 2.17.1
>

Best,
Sumit.
diff mbox series

Patch

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index afd22c9dbdcf..6b5db954569f 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -52,6 +52,9 @@  static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
 				 unsigned int fd_flags,
 				 unsigned int heap_flags)
 {
+	struct dma_buf *dmabuf;
+	int fd;
+
 	/*
 	 * Allocations from all heaps have to begin
 	 * and end on page boundaries.
@@ -60,7 +63,16 @@  static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
 	if (!len)
 		return -EINVAL;
 
-	return heap->ops->allocate(heap, len, fd_flags, heap_flags);
+	dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags);
+	if (IS_ERR(dmabuf))
+		return PTR_ERR(dmabuf);
+
+	fd = dma_buf_fd(dmabuf, fd_flags);
+	if (fd < 0) {
+		dma_buf_put(dmabuf);
+		/* just return, as put will call release and that will free */
+	}
+	return fd;
 }
 
 static int dma_heap_open(struct inode *inode, struct file *file)
diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
index 0c76cbc3fb11..985c41ffd85b 100644
--- a/drivers/dma-buf/heaps/cma_heap.c
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -272,10 +272,10 @@  static const struct dma_buf_ops cma_heap_buf_ops = {
 	.release = cma_heap_dma_buf_release,
 };
 
-static int cma_heap_allocate(struct dma_heap *heap,
-				  unsigned long len,
-				  unsigned long fd_flags,
-				  unsigned long heap_flags)
+static struct dma_buf *cma_heap_allocate(struct dma_heap *heap,
+					 unsigned long len,
+					 unsigned long fd_flags,
+					 unsigned long heap_flags)
 {
 	struct cma_heap *cma_heap = dma_heap_get_drvdata(heap);
 	struct cma_heap_buffer *buffer;
@@ -290,7 +290,7 @@  static int cma_heap_allocate(struct dma_heap *heap,
 
 	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 	if (!buffer)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	INIT_LIST_HEAD(&buffer->attachments);
 	mutex_init(&buffer->lock);
@@ -349,15 +349,7 @@  static int cma_heap_allocate(struct dma_heap *heap,
 		ret = PTR_ERR(dmabuf);
 		goto free_pages;
 	}
-
-	ret = dma_buf_fd(dmabuf, fd_flags);
-	if (ret < 0) {
-		dma_buf_put(dmabuf);
-		/* just return, as put will call release and that will free */
-		return ret;
-	}
-
-	return ret;
+	return dmabuf;
 
 free_pages:
 	kfree(buffer->pages);
@@ -366,7 +358,7 @@  static int cma_heap_allocate(struct dma_heap *heap,
 free_buffer:
 	kfree(buffer);
 
-	return ret;
+	return ERR_PTR(ret);
 }
 
 static const struct dma_heap_ops cma_heap_ops = {
diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
index 2321c91891f6..7b154424aeb3 100644
--- a/drivers/dma-buf/heaps/system_heap.c
+++ b/drivers/dma-buf/heaps/system_heap.c
@@ -332,10 +332,10 @@  static struct page *alloc_largest_available(unsigned long size,
 	return NULL;
 }
 
-static int system_heap_allocate(struct dma_heap *heap,
-				unsigned long len,
-				unsigned long fd_flags,
-				unsigned long heap_flags)
+static struct dma_buf *system_heap_allocate(struct dma_heap *heap,
+					    unsigned long len,
+					    unsigned long fd_flags,
+					    unsigned long heap_flags)
 {
 	struct system_heap_buffer *buffer;
 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
@@ -350,7 +350,7 @@  static int system_heap_allocate(struct dma_heap *heap,
 
 	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 	if (!buffer)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	INIT_LIST_HEAD(&buffer->attachments);
 	mutex_init(&buffer->lock);
@@ -400,14 +400,7 @@  static int system_heap_allocate(struct dma_heap *heap,
 		ret = PTR_ERR(dmabuf);
 		goto free_pages;
 	}
-
-	ret = dma_buf_fd(dmabuf, fd_flags);
-	if (ret < 0) {
-		dma_buf_put(dmabuf);
-		/* just return, as put will call release and that will free */
-		return ret;
-	}
-	return ret;
+	return dmabuf;
 
 free_pages:
 	for_each_sgtable_sg(table, sg, i) {
@@ -421,7 +414,7 @@  static int system_heap_allocate(struct dma_heap *heap,
 		__free_pages(page, compound_order(page));
 	kfree(buffer);
 
-	return ret;
+	return ERR_PTR(ret);
 }
 
 static const struct dma_heap_ops system_heap_ops = {
diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
index 454e354d1ffb..5bc5c946af58 100644
--- a/include/linux/dma-heap.h
+++ b/include/linux/dma-heap.h
@@ -16,15 +16,15 @@  struct dma_heap;
 
 /**
  * struct dma_heap_ops - ops to operate on a given heap
- * @allocate:		allocate dmabuf and return fd
+ * @allocate:		allocate dmabuf and return struct dma_buf ptr
  *
- * allocate returns dmabuf fd  on success, -errno on error.
+ * allocate returns dmabuf on success, ERR_PTR(-errno) on error.
  */
 struct dma_heap_ops {
-	int (*allocate)(struct dma_heap *heap,
-			unsigned long len,
-			unsigned long fd_flags,
-			unsigned long heap_flags);
+	struct dma_buf *(*allocate)(struct dma_heap *heap,
+				    unsigned long len,
+				    unsigned long fd_flags,
+				    unsigned long heap_flags);
 };
 
 /**