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Date: Thu, 1 Sep 2022 13:44:43 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Christian König <christian.koenig@....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>,
Chris Wilson <chris@...is-wilson.co.uk>
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>,
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>,
Russell King <linux@...linux.org.uk>,
Lucas Stach <l.stach@...gutronix.de>,
Christian Gmeiner <christian.gmeiner@...il.com>
Subject: Re: [PATCH v4 06/21] drm/i915: Prepare to dynamic dma-buf locking
specification
On 9/1/22 09:45, Christian König wrote:
> Am 31.08.22 um 17:37 schrieb Dmitry Osipenko:
>> Prepare i915 driver to the common dynamic dma-buf locking convention
>> by starting to use the unlocked versions of dma-buf API functions
>> and handling cases where importer now holds the reservation lock.
>>
>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
>
> Acked-by: Christian König <christian.koenig@....com>, but it's probably
> best if somebody from the Intel guys take a look as well.
+ Chris Wilson, who touched locks of __i915_gem_free_objects() recently
>> ---
>> drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 +-
>> drivers/gpu/drm/i915/gem/i915_gem_object.c | 12 ++++++++++++
>> .../gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 16 ++++++++--------
>> 3 files changed, 21 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> index f5062d0c6333..07eee1c09aaf 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> @@ -72,7 +72,7 @@ static int i915_gem_dmabuf_vmap(struct dma_buf
>> *dma_buf,
>> struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
>> void *vaddr;
>> - vaddr = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
>> + vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
>> if (IS_ERR(vaddr))
>> return PTR_ERR(vaddr);
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> b/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> index 389e9f157ca5..7e2a9b02526c 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> @@ -331,7 +331,19 @@ static void __i915_gem_free_objects(struct
>> drm_i915_private *i915,
>> continue;
>> }
>> + /*
>> + * dma_buf_unmap_attachment() requires reservation to be
>> + * locked. The imported GEM shouldn't share reservation lock,
>> + * so it's safe to take the lock.
>> + */
>> + if (obj->base.import_attach)
>> + i915_gem_object_lock(obj, NULL);
>> +
>> __i915_gem_object_pages_fini(obj);
>> +
>> + if (obj->base.import_attach)
>> + i915_gem_object_unlock(obj);
>> +
>> __i915_gem_free_object(obj);
>> /* But keep the pointer alive for RCU-protected lookups */
>> diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
>> b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
>> index 62c61af77a42..9e3ed634aa0e 100644
>> --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
>> @@ -213,7 +213,7 @@ static int igt_dmabuf_import_same_driver(struct
>> drm_i915_private *i915,
>> goto out_import;
>> }
>> - st = dma_buf_map_attachment(import_attach, DMA_BIDIRECTIONAL);
>> + st = dma_buf_map_attachment_unlocked(import_attach,
>> DMA_BIDIRECTIONAL);
>> if (IS_ERR(st)) {
>> err = PTR_ERR(st);
>> goto out_detach;
>> @@ -226,7 +226,7 @@ static int igt_dmabuf_import_same_driver(struct
>> drm_i915_private *i915,
>> timeout = -ETIME;
>> }
>> err = timeout > 0 ? 0 : timeout;
>> - dma_buf_unmap_attachment(import_attach, st, DMA_BIDIRECTIONAL);
>> + dma_buf_unmap_attachment_unlocked(import_attach, st,
>> DMA_BIDIRECTIONAL);
>> out_detach:
>> dma_buf_detach(dmabuf, import_attach);
>> out_import:
>> @@ -296,7 +296,7 @@ static int igt_dmabuf_import(void *arg)
>> goto out_obj;
>> }
>> - err = dma_buf_vmap(dmabuf, &map);
>> + err = dma_buf_vmap_unlocked(dmabuf, &map);
>> dma_map = err ? NULL : map.vaddr;
>> if (!dma_map) {
>> pr_err("dma_buf_vmap failed\n");
>> @@ -337,7 +337,7 @@ static int igt_dmabuf_import(void *arg)
>> err = 0;
>> out_dma_map:
>> - dma_buf_vunmap(dmabuf, &map);
>> + dma_buf_vunmap_unlocked(dmabuf, &map);
>> out_obj:
>> i915_gem_object_put(obj);
>> out_dmabuf:
>> @@ -358,7 +358,7 @@ static int igt_dmabuf_import_ownership(void *arg)
>> if (IS_ERR(dmabuf))
>> return PTR_ERR(dmabuf);
>> - err = dma_buf_vmap(dmabuf, &map);
>> + err = dma_buf_vmap_unlocked(dmabuf, &map);
>> ptr = err ? NULL : map.vaddr;
>> if (!ptr) {
>> pr_err("dma_buf_vmap failed\n");
>> @@ -367,7 +367,7 @@ static int igt_dmabuf_import_ownership(void *arg)
>> }
>> memset(ptr, 0xc5, PAGE_SIZE);
>> - dma_buf_vunmap(dmabuf, &map);
>> + dma_buf_vunmap_unlocked(dmabuf, &map);
>> obj = to_intel_bo(i915_gem_prime_import(&i915->drm, dmabuf));
>> if (IS_ERR(obj)) {
>> @@ -418,7 +418,7 @@ static int igt_dmabuf_export_vmap(void *arg)
>> }
>> i915_gem_object_put(obj);
>> - err = dma_buf_vmap(dmabuf, &map);
>> + err = dma_buf_vmap_unlocked(dmabuf, &map);
>> ptr = err ? NULL : map.vaddr;
>> if (!ptr) {
>> pr_err("dma_buf_vmap failed\n");
>> @@ -435,7 +435,7 @@ static int igt_dmabuf_export_vmap(void *arg)
>> memset(ptr, 0xc5, dmabuf->size);
>> err = 0;
>> - dma_buf_vunmap(dmabuf, &map);
>> + dma_buf_vunmap_unlocked(dmabuf, &map);
>> out:
>> dma_buf_put(dmabuf);
>> return err;
>
--
Best regards,
Dmitry
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