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

From: Sumit Semwal
Date: Thu Jan 21 2021 - 08:40:51 EST

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In reply to: John Stultz: "[RESEND][PATCH 3/3] dma-buf: heaps: Rework heep allocation hooks to return struct dma_buf instead of fd"
Next in thread: John Stultz: "[RESEND][PATCH 2/3] dma-buf: heaps: Add a WARN_ON should the vmap_cnt go negative"
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Hi John,

On Wed, 20 Jan 2021 at 02:15, John Stultz <john.stultz@xxxxxxxxxx> 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@xxxxxxxxxx>
> Cc: Liam Mark <lmark@xxxxxxxxxxxxxx>
> Cc: Laura Abbott <labbott@xxxxxxxxxx>
> Cc: Brian Starkey <Brian.Starkey@xxxxxxx>
> Cc: Hridya Valsaraju <hridya@xxxxxxxxxx>
> Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> Cc: Sandeep Patil <sspatil@xxxxxxxxxx>
> Cc: Daniel Mentz <danielmentz@xxxxxxxxxx>
> Cc: Chris Goldsworthy <cgoldswo@xxxxxxxxxxxxxx>
> Cc: Ørjan Eide <orjan.eide@xxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> Cc: Simon Ser <contact@xxxxxxxxxxx>
> Cc: James Jones <jajones@xxxxxxxxxx>
> Cc: linux-media@xxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
> ---
> 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.

Next message: Dongseok Yi: "[PATCH net v3] udp: ipv4: manipulate network header of NATed UDP GRO fraglist"
Previous message: Mohamed Mediouni: "Re: [RFC PATCH 7/7] irqchip/apple-aic: add SMP support to the Apple AIC driver."
In reply to: John Stultz: "[RESEND][PATCH 3/3] dma-buf: heaps: Rework heep allocation hooks to return struct dma_buf instead of fd"
Next in thread: John Stultz: "[RESEND][PATCH 2/3] dma-buf: heaps: Add a WARN_ON should the vmap_cnt go negative"
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