On Wed, May 15, 2024 at 07:23:04PM GMT, Yong Wu wrote:
> Add "struct restricted_heap_ops". For the restricted memory, totally there
> are two steps:
> a) alloc: Allocate the buffer in kernel;
> b) restrict_buf: Restrict/Protect/Secure that buffer.
> The "alloc" is mandatory while "restrict_buf" is optional since it may
> be part of "alloc".
>
> Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
> ---
> drivers/dma-buf/heaps/restricted_heap.c | 41 ++++++++++++++++++++++++-
> drivers/dma-buf/heaps/restricted_heap.h | 12 ++++++++
> 2 files changed, 52 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/heaps/restricted_heap.c b/drivers/dma-buf/heaps/restricted_heap.c
> index c2ae19ba7d7e..8bb3c1876a69 100644
> --- a/drivers/dma-buf/heaps/restricted_heap.c
> +++ b/drivers/dma-buf/heaps/restricted_heap.c
> @@ -12,10 +12,44 @@
>
> #include "restricted_heap.h"
>
> +static int
> +restricted_heap_memory_allocate(struct restricted_heap *rheap, struct restricted_buffer *buf)
> +{
> + const struct restricted_heap_ops *ops = rheap->ops;
> + int ret;
> +
> + ret = ops->alloc(rheap, buf);
> + if (ret)
> + return ret;
> +
> + if (ops->restrict_buf) {
> + ret = ops->restrict_buf(rheap, buf);
> + if (ret)
> + goto buf_free;
> + }
> + return 0;
> +
> +buf_free:
> + ops->free(rheap, buf);
> + return ret;
> +}
> +
> +static void
> +restricted_heap_memory_free(struct restricted_heap *rheap, struct restricted_buffer *buf)
> +{
> + const struct restricted_heap_ops *ops = rheap->ops;
> +
> + if (ops->unrestrict_buf)
> + ops->unrestrict_buf(rheap, buf);
> +
> + ops->free(rheap, buf);
> +}
> +
> static struct dma_buf *
> restricted_heap_allocate(struct dma_heap *heap, unsigned long size,
> unsigned long fd_flags, unsigned long heap_flags)
> {
> + struct restricted_heap *rheap = dma_heap_get_drvdata(heap);
> struct restricted_buffer *restricted_buf;
> DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> struct dma_buf *dmabuf;
> @@ -28,6 +62,9 @@ restricted_heap_allocate(struct dma_heap *heap, unsigned long size,
> restricted_buf->size = ALIGN(size, PAGE_SIZE);
> restricted_buf->heap = heap;
>
> + ret = restricted_heap_memory_allocate(rheap, restricted_buf);
> + if (ret)
> + goto err_free_buf;
> exp_info.exp_name = dma_heap_get_name(heap);
> exp_info.size = restricted_buf->size;
> exp_info.flags = fd_flags;
> @@ -36,11 +73,13 @@ restricted_heap_allocate(struct dma_heap *heap, unsigned long size,
> dmabuf = dma_buf_export(&exp_info);
> if (IS_ERR(dmabuf)) {
> ret = PTR_ERR(dmabuf);
> - goto err_free_buf;
> + goto err_free_rstrd_mem;
> }
>
> return dmabuf;
>
> +err_free_rstrd_mem:
> + restricted_heap_memory_free(rheap, restricted_buf);
> err_free_buf:
> kfree(restricted_buf);
> return ERR_PTR(ret);
> diff --git a/drivers/dma-buf/heaps/restricted_heap.h b/drivers/dma-buf/heaps/restricted_heap.h
> index b448f77616ac..5783275d5714 100644
> --- a/drivers/dma-buf/heaps/restricted_heap.h
> +++ b/drivers/dma-buf/heaps/restricted_heap.h
> @@ -15,6 +15,18 @@ struct restricted_buffer {
>
> struct restricted_heap {
> const char *name;
> +
> + const struct restricted_heap_ops *ops;
> +};
> +
> +struct restricted_heap_ops {
> + int (*heap_init)(struct restricted_heap *rheap);
It might be worth moving this to a later patch when it's actually
getting used.
Thierry
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