linux-kernel - Re: [PATCH] tee: optee: Fix dynamic shm pool allocations

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Message-ID: <CAHUa44Hk0LtCsbOcLq=of_pGSAYOnaod13N88ZMQOymmCGEJ6g@mail.gmail.com>
Date:   Fri, 8 Nov 2019 11:39:15 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>,
        "tee-dev @ lists . linaro . org" <tee-dev@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Carriere Etienne <etienne.carriere@...aro.org>
Subject: Re: [PATCH] tee: optee: Fix dynamic shm pool allocations

Hi Sumit,

On Thu, Nov 7, 2019 at 1:41 PM Sumit Garg <sumit.garg@...aro.org> wrote:
>
> Hi Jens,
>
> On Thu, 7 Nov 2019 at 16:36, Jens Wiklander <jens.wiklander@...aro.org> wrote:
> >
> > Hi Sumit,
> >
> > On Thu, Oct 31, 2019 at 06:37:54PM +0530, Sumit Garg wrote:
> > > In case of dynamic shared memory pool, kernel memory allocated using
> > > dmabuf_mgr pool needs to be registered with OP-TEE prior to its usage
> > > during optee_open_session() or optee_invoke_func().
> > >
> > > So fix dmabuf_mgr pool allocations via an additional call to
> > > optee_shm_register().
> > >
> > > Fixes: 9733b072a12a ("optee: allow to work without static shared memory")
> > > Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
> >
> > Looks good, I'm picking this up. Etienne told me has tested this on some
> > of his hardware so I'll add:
> > Tested-by: Etienne Carriere <etienne.carriere@...aro.org>
> >
>
> Thanks for picking this up.
>
> >
> > > ---
> > >
> > > Depends on patch: https://lkml.org/lkml/2019/7/30/506 that adds support
> > > to allow registration of kernel buffers with OP-TEE.
>
> You also need to pick up the dependency patch too. The latest v3 of
> this patch is here [1] although its unchanged from v2. Also, If you
> pick that up I will drop it from future revisions of Trusted Keys
> patchset [2].
>
> [1] https://lkml.org/lkml/2019/10/31/431
> [2] https://lkml.org/lkml/2019/10/31/430

So I missed taking [1] into account. I think that it would make more
sense to merge this patch ("tee: optee: Fix dynamic shm pool
allocations") with [1] ("tee: optee: allow kernel pages to register as
shm") into a new patch.

Cheers,
Jens

>
> -Sumit
>
> > >
> > >  drivers/tee/optee/shm_pool.c | 12 +++++++++++-
> > >  1 file changed, 11 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c
> > > index de1d9b8..0332a53 100644
> > > --- a/drivers/tee/optee/shm_pool.c
> > > +++ b/drivers/tee/optee/shm_pool.c
> > > @@ -17,6 +17,7 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
> > >  {
> > >       unsigned int order = get_order(size);
> > >       struct page *page;
> > > +     int rc = 0;
> > >
> > >       page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
> > >       if (!page)
> > > @@ -26,12 +27,21 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
> > >       shm->paddr = page_to_phys(page);
> > >       shm->size = PAGE_SIZE << order;
> > >
> > > -     return 0;
> > > +     if (shm->flags & TEE_SHM_DMA_BUF) {
> > > +             shm->flags |= TEE_SHM_REGISTER;
> > > +             rc = optee_shm_register(shm->ctx, shm, &page, 1 << order,
> > > +                                     (unsigned long)shm->kaddr);
> > > +     }
> > > +
> > > +     return rc;
> > >  }
> > >
> > >  static void pool_op_free(struct tee_shm_pool_mgr *poolm,
> > >                        struct tee_shm *shm)
> > >  {
> > > +     if (shm->flags & TEE_SHM_DMA_BUF)
> > > +             optee_shm_unregister(shm->ctx, shm);
> > > +
> > >       free_pages((unsigned long)shm->kaddr, get_order(shm->size));
> > >       shm->kaddr = NULL;
> > >  }
> > > --
> > > 2.7.4
> > >