linux-kernel - Re: [PATCH v5 5/9] dma-buf: heaps: restricted

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Message-ID: <gbj6vakab74yuhbkazlxvrz3x3bia3nb7loo7c74fadlh4wc2q@qjf44kr3mrqe>
Date: Fri, 28 Jun 2024 14:26:44 +0200
From: Thierry Reding <thierry.reding@...il.com>
To: Yong Wu <yong.wu@...iatek.com>
Cc: Rob Herring <robh+dt@...nel.org>, 
	Matthias Brugger <matthias.bgg@...il.com>, christian.koenig@....com, Sumit Semwal <sumit.semwal@...aro.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, Benjamin Gaignard <benjamin.gaignard@...labora.com>, 
	Brian Starkey <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, tjmercier@...gle.com, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, 
	linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
	Robin Murphy <robin.murphy@....com>, Vijayanand Jitta <quic_vjitta@...cinc.com>, 
	Joakim Bech <joakim.bech@...aro.org>, Jeffrey Kardatzke <jkardatzke@...gle.com>, 
	Pavel Machek <pavel@....cz>, Simon Ser <contact@...rsion.fr>, 
	Pekka Paalanen <ppaalanen@...il.com>, willy@...radead.org, Logan Gunthorpe <logang@...tatee.com>, 
	Daniel Vetter <daniel@...ll.ch>, jianjiao.zeng@...iatek.com, kuohong.wang@...iatek.com, 
	youlin.pei@...iatek.com
Subject: Re: [PATCH v5 5/9] dma-buf: heaps: restricted_heap: Add private heap
 ops

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@...iatek.com>
> ---
>  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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