linux-kernel - Re: [PATCH v6 05/10] tee: implement restricted DMA-heap

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Message-ID: <Z-ucuPzwz4IqVTgb@sumit-X1>
Date: Tue, 1 Apr 2025 13:28:48 +0530
From: Sumit Garg <sumit.garg@...nel.org>
To: Jens Wiklander <jens.wiklander@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
	op-tee@...ts.trustedfirmware.org,
	linux-arm-kernel@...ts.infradead.org,
	Olivier Masse <olivier.masse@....com>,
	Thierry Reding <thierry.reding@...il.com>,
	Yong Wu <yong.wu@...iatek.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>,
	Brian Starkey <Brian.Starkey@....com>,
	John Stultz <jstultz@...gle.com>,
	"T . J . Mercier" <tjmercier@...gle.com>,
	Christian König <christian.koenig@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	azarrabi@....qualcomm.com, Simona Vetter <simona.vetter@...ll.ch>,
	Daniel Stone <daniel@...ishbar.org>
Subject: Re: [PATCH v6 05/10] tee: implement restricted DMA-heap

On Tue, Mar 25, 2025 at 11:55:46AM +0100, Jens Wiklander wrote:
> Hi Sumit,
> 

<snip>

> 
> >
> > > +
> > > +#include "tee_private.h"
> > > +
> > > +struct tee_dma_heap {
> > > +     struct dma_heap *heap;
> > > +     enum tee_dma_heap_id id;
> > > +     struct tee_rstmem_pool *pool;
> > > +     struct tee_device *teedev;
> > > +     /* Protects pool and teedev above */
> > > +     struct mutex mu;
> > > +};
> > > +
> > > +struct tee_heap_buffer {
> > > +     struct tee_rstmem_pool *pool;
> > > +     struct tee_device *teedev;
> > > +     size_t size;
> > > +     size_t offs;
> > > +     struct sg_table table;
> > > +};
> > > +
> > > +struct tee_heap_attachment {
> > > +     struct sg_table table;
> > > +     struct device *dev;
> > > +};
> > > +
> > > +struct tee_rstmem_static_pool {
> > > +     struct tee_rstmem_pool pool;
> > > +     struct gen_pool *gen_pool;
> > > +     phys_addr_t pa_base;
> > > +};
> > > +
> > > +#if !IS_MODULE(CONFIG_TEE) && IS_ENABLED(CONFIG_DMABUF_HEAPS)
> >
> > Can this dependency rather be better managed via Kconfig?
> 
> This was the easiest yet somewhat flexible solution I could find. If
> you have something better, let's use that instead.
>

--- a/drivers/tee/optee/Kconfig
+++ b/drivers/tee/optee/Kconfig
@@ -5,6 +5,7 @@ config OPTEE
        depends on HAVE_ARM_SMCCC
        depends on MMU
        depends on RPMB || !RPMB
+       select DMABUF_HEAPS
        help
          This implements the OP-TEE Trusted Execution Environment (TEE)
          driver.

-Sumit