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[73.67.135.195]) by smtp.gmail.com with ESMTPSA id z18-20020a1709028f9200b00198f2407ea1sm2033972plo.241.2023.02.20.12.19.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Feb 2023 12:19:27 -0800 (PST) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [PATCH v5 06/14] dma-buf/sync_file: Support (E)POLLPRI Date: Mon, 20 Feb 2023 12:18:53 -0800 Message-Id: <20230220201916.1822214-7-robdclark@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230220201916.1822214-1-robdclark@gmail.com> References: <20230220201916.1822214-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Clark , Gustavo Padovan , Tvrtko Ursulin , =?UTF-8?q?Christian=20K=C3=B6nig?= , =?UTF-8?q?Michel=20D=C3=A4nzer?= , open list , =?UTF-8?q?Christian=20K=C3=B6nig?= , "moderated list:DMA BUFFER SHARING FRAMEWORK" , Pekka Paalanen , Rodrigo Vivi , Alex Deucher , freedreno@lists.freedesktop.org, Sumit Semwal , "open list:SYNC FILE FRAMEWORK" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Rob Clark Allow userspace to use the EPOLLPRI/POLLPRI flag to indicate an urgent wait (as opposed to a "housekeeping" wait to know when to cleanup after some work has completed). Usermode components of GPU driver stacks often poll() on fence fd's to know when it is safe to do things like free or reuse a buffer, but they can also poll() on a fence fd when waiting to read back results from the GPU. The EPOLLPRI/POLLPRI flag lets the kernel differentiate these two cases. Signed-off-by: Rob Clark --- drivers/dma-buf/sync_file.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index 418021cfb87c..cbe96295373b 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -192,6 +192,14 @@ static __poll_t sync_file_poll(struct file *file, poll_table *wait) { struct sync_file *sync_file = file->private_data; + /* + * The POLLPRI/EPOLLPRI flag can be used to signal that + * userspace wants the fence to signal ASAP, express this + * as an immediate deadline. + */ + if (poll_requested_events(wait) & EPOLLPRI) + dma_fence_set_deadline(sync_file->fence, ktime_get()); + poll_wait(file, &sync_file->wq, wait); if (list_empty(&sync_file->cb.node) && -- 2.39.1