Message ID | 20230402164826.752842-1-dmitry.osipenko@collabora.com (mailing list archive) |
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Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from <linux-media-owner@vger.kernel.org>) id 1pj0tL-00BAIK-U9; Sun, 02 Apr 2023 16:49:20 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230496AbjDBQtQ (ORCPT <rfc822;mkrufky@linuxtv.org> + 1 other); Sun, 2 Apr 2023 12:49:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229459AbjDBQtP (ORCPT <rfc822;linux-media@vger.kernel.org>); Sun, 2 Apr 2023 12:49:15 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58963DBD0; Sun, 2 Apr 2023 09:49:14 -0700 (PDT) Received: from workpc.. (109-252-124-32.nat.spd-mgts.ru [109.252.124.32]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dmitry.osipenko) by madras.collabora.co.uk (Postfix) with ESMTPSA id 55288660209A; Sun, 2 Apr 2023 17:49:10 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1680454152; bh=kjTtuZafxqQ//qonolfaG0xTHClDJ/0hYqwWpo1/w0k=; h=From:To:Cc:Subject:Date:From; b=PM3m6hysogG6uCz7g8USUVA1IMYM+iGZA6+yIjQgSO72di64cd3XcPWbSoQK4u17A NF5dj16eH5qZED1KNKFanlRxxAm33kiySG/ZCfeQQZSLmMavJo8DDfRdGdUvPbwQz9 3nGTOktieV1US0uEoj0ZjpqwQ+9Ar6n/VfJlqv0TI7F33tXQfLmGOs0QruTBvHrey4 QVLQZR5Vhn6IF2ASDNZtrHeH/7STOxqrfwrMOLISeiNaNhPDHttDYeIQoC1TTNGYIr cf2lOEToXQJSC39ChYTfcECrx5g5hpr1s3eW8kQ/gWWgcrTeAi4enC2cynT8Psd2kT yJwrl4uuH9k8Q== From: Dmitry Osipenko <dmitry.osipenko@collabora.com> To: Sumit Semwal <sumit.semwal@linaro.org>, =?utf-8?q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>, Benjamin Gaignard <benjamin.gaignard@collabora.com>, Liam Mark <lmark@codeaurora.org>, Brian Starkey <Brian.Starkey@arm.com>, John Stultz <jstultz@google.com>, Gerd Hoffmann <kraxel@redhat.com>, Daniel Vetter <daniel@ffwll.ch>, Jani Nikula <jani.nikula@linux.intel.com>, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Thomas Zimmermann <tzimmermann@suse.de>, Tomi Valkeinen <tomba@kernel.org>, Thierry Reding <thierry.reding@gmail.com>, Tomasz Figa <tfiga@chromium.org>, Marek Szyprowski <m.szyprowski@samsung.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, Amol Maheshwari <amahesh@qti.qualcomm.com> Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-arm-msm@vger.kernel.org, kernel@collabora.com Subject: [PATCH v1 0/7] Move dma-buf mmap() reservation locking down to exporters Date: Sun, 2 Apr 2023 19:48:19 +0300 Message-Id: <20230402164826.752842-1-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-media.vger.kernel.org> X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no |
Series |
Move dma-buf mmap() reservation locking down to exporters
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Message
Dmitry Osipenko
April 2, 2023, 4:48 p.m. UTC
This patchset makes dma-buf exporters responisble for taking care of the reservation lock. I also included patch that moves drm-shmem to use reservation lock, to let CI test the whole set. I'm going to take all the patches via the drm-misc tree, please give an ack. Previous policy stated that dma-buf core takes the lock around mmap() callback. Which meant that both importers and exporters shouldn't touch the reservation lock in the mmap() code path. This worked well until Intel-CI found a deadlock problem in a case of self-imported dma-buf [1]. The problem happens when userpace mmaps a self-imported dma-buf, i.e. mmaps the dma-buf FD. DRM core treats self-imported dma-bufs as own GEMs [2]. There is no way to differentiate a prime GEM from a normal GEM for drm-shmem in drm_gem_shmem_mmap(), which resulted in a deadlock problem for drm-shmem mmap() code path once it's switched to use reservation lock. It was difficult to fix the drm-shmem problem without adjusting dma-buf locking policy. In parctice not much changed from importers perspective because previosly dma-buf was taking the lock in between of importers and exporters. Now this lock is shifted down to exporters. [1] https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_114671v2/shard-snb5/igt@prime_vgem@sync@rcs0.html [2] https://elixir.bootlin.com/linux/v6.3-rc4/source/drivers/gpu/drm/drm_prime.c#L924 Dmitry Osipenko (7): Revert "media: videobuf2: Assert held reservation lock for dma-buf mmapping" Revert "dma-buf/heaps: Assert held reservation lock for dma-buf mmapping" Revert "udmabuf: Assert held reservation lock for dma-buf mmapping" Revert "fastrpc: Assert held reservation lock for dma-buf mmapping" Revert "drm: Assert held reservation lock for dma-buf mmapping" dma-buf: Change locking policy for mmap() drm/shmem-helper: Switch to reservation lock drivers/dma-buf/dma-buf.c | 17 +- drivers/dma-buf/heaps/cma_heap.c | 3 - drivers/dma-buf/heaps/system_heap.c | 3 - drivers/dma-buf/udmabuf.c | 2 - drivers/gpu/drm/drm_gem_shmem_helper.c | 217 ++++++++---------- drivers/gpu/drm/drm_prime.c | 2 - drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 - drivers/gpu/drm/lima/lima_gem.c | 8 +- drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 2 - drivers/gpu/drm/panfrost/panfrost_drv.c | 7 +- .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 6 +- drivers/gpu/drm/panfrost/panfrost_mmu.c | 19 +- drivers/gpu/drm/tegra/gem.c | 2 - .../common/videobuf2/videobuf2-dma-contig.c | 3 - .../media/common/videobuf2/videobuf2-dma-sg.c | 3 - .../common/videobuf2/videobuf2-vmalloc.c | 3 - drivers/misc/fastrpc.c | 3 - include/drm/drm_gem_shmem_helper.h | 14 +- 18 files changed, 123 insertions(+), 193 deletions(-)
Comments
On 4/2/23 19:48, Dmitry Osipenko wrote: > This patchset makes dma-buf exporters responisble for taking care of > the reservation lock. I also included patch that moves drm-shmem to use > reservation lock, to let CI test the whole set. I'm going to take all > the patches via the drm-misc tree, please give an ack. > > Previous policy stated that dma-buf core takes the lock around mmap() > callback. Which meant that both importers and exporters shouldn't touch > the reservation lock in the mmap() code path. This worked well until > Intel-CI found a deadlock problem in a case of self-imported dma-buf [1]. > > The problem happens when userpace mmaps a self-imported dma-buf, i.e. > mmaps the dma-buf FD. DRM core treats self-imported dma-bufs as own GEMs > [2]. There is no way to differentiate a prime GEM from a normal GEM for > drm-shmem in drm_gem_shmem_mmap(), which resulted in a deadlock problem > for drm-shmem mmap() code path once it's switched to use reservation lock. > > It was difficult to fix the drm-shmem problem without adjusting dma-buf > locking policy. In parctice not much changed from importers perspective > because previosly dma-buf was taking the lock in between of importers > and exporters. Now this lock is shifted down to exporters. > > [1] https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_114671v2/shard-snb5/igt@prime_vgem@sync@rcs0.html > [2] https://elixir.bootlin.com/linux/v6.3-rc4/source/drivers/gpu/drm/drm_prime.c#L924 > > Dmitry Osipenko (7): > Revert "media: videobuf2: Assert held reservation lock for dma-buf > mmapping" > Revert "dma-buf/heaps: Assert held reservation lock for dma-buf > mmapping" > Revert "udmabuf: Assert held reservation lock for dma-buf mmapping" > Revert "fastrpc: Assert held reservation lock for dma-buf mmapping" > Revert "drm: Assert held reservation lock for dma-buf mmapping" > dma-buf: Change locking policy for mmap() > drm/shmem-helper: Switch to reservation lock > > drivers/dma-buf/dma-buf.c | 17 +- > drivers/dma-buf/heaps/cma_heap.c | 3 - > drivers/dma-buf/heaps/system_heap.c | 3 - > drivers/dma-buf/udmabuf.c | 2 - > drivers/gpu/drm/drm_gem_shmem_helper.c | 217 ++++++++---------- > drivers/gpu/drm/drm_prime.c | 2 - > drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 - > drivers/gpu/drm/lima/lima_gem.c | 8 +- > drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 2 - > drivers/gpu/drm/panfrost/panfrost_drv.c | 7 +- > .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 6 +- > drivers/gpu/drm/panfrost/panfrost_mmu.c | 19 +- > drivers/gpu/drm/tegra/gem.c | 2 - > .../common/videobuf2/videobuf2-dma-contig.c | 3 - > .../media/common/videobuf2/videobuf2-dma-sg.c | 3 - > .../common/videobuf2/videobuf2-vmalloc.c | 3 - > drivers/misc/fastrpc.c | 3 - > include/drm/drm_gem_shmem_helper.h | 14 +- > 18 files changed, 123 insertions(+), 193 deletions(-) > Intel's IGT passed[1] (see Tests section) with the new locking policy, which failed previously for the "drm/shmem-helper: Switch to reservation lock" patch. [1] https://patchwork.freedesktop.org/series/116000/