Re: [RESEND][PATCH 3/3] dma-buf: heaps: Rework heep allocation hooks to return struct dma_buf instead of fd
Hi John,
On Wed, 20 Jan 2021 at 02:15, John Stultz 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
> Cc: Liam Mark
> Cc: Laura Abbott
> Cc: Brian Starkey
> Cc: Hridya Valsaraju
> Cc: Suren Baghdasaryan
> Cc: Sandeep Patil
> Cc: Daniel Mentz
> Cc: Chris Goldsworthy
> Cc: Ørjan Eide
> Cc: Robin Murphy
> Cc: Ezequiel Garcia
> Cc: Simon Ser
> Cc: James Jones
> Cc: linux-me...@vger.kernel.org
> Cc: dri-de...@lists.freedesktop.org
> Signed-off-by: John Stultz
> ---
> 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(>attachments);
> mutex_init(>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,
> +
[RESEND][PATCH 3/3] dma-buf: heaps: Rework heep allocation hooks to return struct dma_buf instead of fd
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
Cc: Liam Mark
Cc: Laura Abbott
Cc: Brian Starkey
Cc: Hridya Valsaraju
Cc: Suren Baghdasaryan
Cc: Sandeep Patil
Cc: Daniel Mentz
Cc: Chris Goldsworthy
Cc: Ørjan Eide
Cc: Robin Murphy
Cc: Ezequiel Garcia
Cc: Simon Ser
Cc: James Jones
Cc: linux-me...@vger.kernel.org
Cc: dri-de...@lists.freedesktop.org
Signed-off-by: John Stultz
---
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(>attachments);
mutex_init(>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);
