linux-kernel - Re: [PATCH v3 07/15] firmware: qcom: scm: make qcom_scm_assign

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMRc=MdGABGa_bc3_ug+iSKtMg9pcKe40F7zv9Ff2C0ed8i2=Q@mail.gmail.com>
Date:   Wed, 11 Oct 2023 09:41:49 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andrew Halaney <ahalaney@...hat.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Alex Elder <elder@...aro.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...cinc.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 07/15] firmware: qcom: scm: make qcom_scm_assign_mem()
 use the TZ allocator

On Wed, Oct 11, 2023 at 12:19 AM Andrew Halaney <ahalaney@...hat.com> wrote:
>
> On Mon, Oct 09, 2023 at 05:34:19PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >
> > Let's use the new TZ memory allocator to obtain a buffer for this call
> > instead of using dma_alloc_coherent().
> >
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > ---
> >  drivers/firmware/qcom/qcom_scm.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> > index 71e98b666391..754f6056b99f 100644
> > --- a/drivers/firmware/qcom/qcom_scm.c
> > +++ b/drivers/firmware/qcom/qcom_scm.c
> > @@ -4,6 +4,7 @@
> >   */
> >
> >  #include <linux/arm-smccc.h>
> > +#include <linux/cleanup.h>
> >  #include <linux/clk.h>
> >  #include <linux/completion.h>
> >  #include <linux/cpumask.h>
> > @@ -998,14 +999,13 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
> >       struct qcom_scm_mem_map_info *mem_to_map;
> >       phys_addr_t mem_to_map_phys;
> >       phys_addr_t dest_phys;
> > -     dma_addr_t ptr_phys;
> > +     phys_addr_t ptr_phys;
> >       size_t mem_to_map_sz;
> >       size_t dest_sz;
> >       size_t src_sz;
> >       size_t ptr_sz;
> >       int next_vm;
> >       __le32 *src;
> > -     void *ptr;
>
> nit: couldn't you keep this up here?
>

This still needs to make its way into the coding style guide but I got
yelled at by Linus Torvalds personally for not declaring the managed
variables where they are initialized. So this is the correct approach.

Bart

> Otherwise,
>
> Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
>
> >       int ret, i, b;
> >       u64 srcvm_bits = *srcvm;
> >
> > @@ -1015,10 +1015,13 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
> >       ptr_sz = ALIGN(src_sz, SZ_64) + ALIGN(mem_to_map_sz, SZ_64) +
> >                       ALIGN(dest_sz, SZ_64);
> >
> > -     ptr = dma_alloc_coherent(__scm->dev, ptr_sz, &ptr_phys, GFP_KERNEL);
> > +     void *ptr __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool,
> > +                                                     ptr_sz, GFP_KERNEL);
> >       if (!ptr)
> >               return -ENOMEM;
> >
> > +     ptr_phys = qcom_tzmem_to_phys(ptr);
> > +
> >       /* Fill source vmid detail */
> >       src = ptr;
> >       i = 0;
> > @@ -1047,7 +1050,6 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
> >
> >       ret = __qcom_scm_assign_mem(__scm->dev, mem_to_map_phys, mem_to_map_sz,
> >                                   ptr_phys, src_sz, dest_phys, dest_sz);
> > -     dma_free_coherent(__scm->dev, ptr_sz, ptr, ptr_phys);
> >       if (ret) {
> >               dev_err(__scm->dev,
> >                       "Assign memory protection call failed %d\n", ret);
> > --
> > 2.39.2
> >
>