linux-kernel - Re: [PATCH v4 09/21] drm/etnaviv: Prepare to dynamic dma-buf locking specification

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Message-ID: <b6d96128-7558-8111-71b0-5fe5502ddf4b@collabora.com>
Date:   Thu, 1 Sep 2022 13:41:21 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Christian König <christian.koenig@....com>,
        Russell King <linux@...linux.org.uk>,
        Lucas Stach <l.stach@...gutronix.de>,
        Christian Gmeiner <christian.gmeiner@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dmitry Osipenko <digetx@...il.com>,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org,
        linux-rdma@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gert Wollny <gert.wollny@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Clark <robdclark@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Thomas Hellström <thomas_os@...pmail.org>,
        Qiang Yu <yuq825@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Tomi Valkeinen <tomba@...nel.org>
Subject: Re: [PATCH v4 09/21] drm/etnaviv: Prepare to dynamic dma-buf locking
 specification

On 9/1/22 09:50, Christian König wrote:
> Am 31.08.22 um 17:37 schrieb Dmitry Osipenko:
>> Prepare Etnaviv driver to the common dynamic dma-buf locking convention
>> by starting to use the unlocked versions of dma-buf API functions.
>>
>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> 
> Interesting, where is the matching vmap()?
> 
> Anyway, this patch is Acked-by: Christian König <christian.koenig@....com>

Etnaviv maps GEM only once and then unmaps it when GEM is destroyed. The
dma-buf vmapping should happen under the reservation lock, hence only
the release function needs to be changed to the unlocked variant.

Lucas/Christian(Gmeiner), could you please check that I haven't missed
anything?

>> ---
>>   drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> index 3fa2da149639..7031db145a77 100644
>> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> @@ -65,7 +65,7 @@ static void etnaviv_gem_prime_release(struct
>> etnaviv_gem_object *etnaviv_obj)
>>       struct iosys_map map = IOSYS_MAP_INIT_VADDR(etnaviv_obj->vaddr);
>>         if (etnaviv_obj->vaddr)
>> -        dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf, &map);
>> +       
>> dma_buf_vunmap_unlocked(etnaviv_obj->base.import_attach->dmabuf, &map);
>>         /* Don't drop the pages for imported dmabuf, as they are not
>>        * ours, just free the array we allocated:
> 


-- 
Best regards,
Dmitry