From patchwork Tue Feb 28 22:58:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13155327 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A84FEC64EC4 for ; Tue, 28 Feb 2023 22:59:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A8BE210E154; Tue, 28 Feb 2023 22:59:00 +0000 (UTC) Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by gabe.freedesktop.org (Postfix) with ESMTPS id 248CC10E12E; Tue, 28 Feb 2023 22:58:51 +0000 (UTC) Received: by mail-pj1-x102f.google.com with SMTP id h17-20020a17090aea9100b0023739b10792so11156343pjz.1; Tue, 28 Feb 2023 14:58:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1677625130; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Gs2AYZBiyJOWo2bwEtPyAED3FFjm3LWbSVDHsOlHbbQ=; b=muUcV42OpNmDtSH3eB+39vnSACqove5RL9oED345x5ztYt6mH/n6Remh2hRwDIf7jo 0B86CLgfkW4Q9EynJL/rwqmWjx/4/bg6gnJqwCu++hmY11VijaNK/HdjK41NVhERiPV1 ltYWNp9Nf0QLrKr1Nm3fexykYZ8GtnNRf6KR/CvYi2xsi497c4RxPpDhe4qnrfKQ9j57 HShNzPLBQzkmpLXT/L7OC+zlmkhl5ArsL5hFn9luAPMcPL2QDvZw+9noVR6Fp4oAGjzr +fT387OP336WvE4nRuHQwWuItFKYNFSAzFRExIYvZtM2ZktqbA3Wt+N1r0/7K1Xr+HqW /6yg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1677625130; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Gs2AYZBiyJOWo2bwEtPyAED3FFjm3LWbSVDHsOlHbbQ=; b=kLUovvz1W9kc6AK2bt3ZCsHupOzJ8G85r1sqJEp1HIk3/0s9NXXxQMtwaA9QhPJQWN K4zOplaKzaUZ7ySsUBp6XWx8yWcn5PbUUYv/neJh0BTFDQ+cwqcb8tQZXeLxGViElZTN koiGEqqHujD5cx+WRsO9LDvKevSnhTIf/Nenolzmwq3+WUlQt6obYIzgiZTxR/PuBq/8 yUg6OCpX2fOsKCNFO0OT8aE/FtNWNT1bZ5UKit+maSbb2Vo4MOFRCE8MZnj6AFRRYXbE E35hLrLntSXoDUCyHDeAtbbvO8+FAYf07bgf0Mu+zgfolOCrn7DIcUyWOyI5DIHgon/5 yjGA== X-Gm-Message-State: AO0yUKUc9gYiFG98uMrDyui3abp4oQVb4ybsmOt8MXoEqnyxZ3MCNRHJ MrRymTgh8S5NKII3rYIsikxcykopjvE= X-Google-Smtp-Source: AK7set/1+Xx8fpKwOaHOBR+49MN2QSzoZfSa3YaQZ7k/0ymgy+GqKeTLwmHuCADWYRyXhryjChCCDA== X-Received: by 2002:a05:6a20:3d92:b0:cc:606a:4330 with SMTP id s18-20020a056a203d9200b000cc606a4330mr5567041pzi.55.1677625130191; Tue, 28 Feb 2023 14:58:50 -0800 (PST) Received: from localhost ([2a00:79e1:abd:4a00:61b:48ed:72ab:435b]) by smtp.gmail.com with ESMTPSA id s23-20020aa78d57000000b00593c1c5bd0esm6492665pfe.164.2023.02.28.14.58.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Feb 2023 14:58:49 -0800 (PST) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [PATCH v8 06/16] dma-buf/sync_file: Add SET_DEADLINE ioctl Date: Tue, 28 Feb 2023 14:58:10 -0800 Message-Id: <20230228225833.2920879-7-robdclark@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230228225833.2920879-1-robdclark@gmail.com> References: <20230228225833.2920879-1-robdclark@gmail.com> MIME-Version: 1.0 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 , Pekka Paalanen , Tvrtko Ursulin , =?utf-8?q?Christian_K=C3=B6nig?= , =?utf-8?q?Michel_D=C3=A4nzer?= , open list , =?utf-8?q?Christian_K=C3=B6nig?= , "moderated list:DMA BUFFER SHARING FRAMEWORK" , Pekka Paalanen , Luben Tuikov , 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 The initial purpose is for igt tests, but this would also be useful for compositors that wait until close to vblank deadline to make decisions about which frame to show. The igt tests can be found at: https://gitlab.freedesktop.org/robclark/igt-gpu-tools/-/commits/fence-deadline v2: Clarify the timebase, add link to igt tests v3: Use u64 value in ns to express deadline. v4: More doc Signed-off-by: Rob Clark Acked-by: Pekka Paalanen --- drivers/dma-buf/dma-fence.c | 3 ++- drivers/dma-buf/sync_file.c | 19 +++++++++++++++++++ include/uapi/linux/sync_file.h | 22 ++++++++++++++++++++++ 3 files changed, 43 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index f177c56269bb..74e36f6d05b0 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -933,7 +933,8 @@ EXPORT_SYMBOL(dma_fence_wait_any_timeout); * the GPU's devfreq to reduce frequency, when in fact the opposite is what is * needed. * - * To this end, deadline hint(s) can be set on a &dma_fence via &dma_fence_set_deadline. + * To this end, deadline hint(s) can be set on a &dma_fence via &dma_fence_set_deadline + * (or indirectly via userspace facing ioctls like &sync_set_deadline). * The deadline hint provides a way for the waiting driver, or userspace, to * convey an appropriate sense of urgency to the signaling driver. * diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index af57799c86ce..418021cfb87c 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -350,6 +350,22 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file, return ret; } +static int sync_file_ioctl_set_deadline(struct sync_file *sync_file, + unsigned long arg) +{ + struct sync_set_deadline ts; + + if (copy_from_user(&ts, (void __user *)arg, sizeof(ts))) + return -EFAULT; + + if (ts.pad) + return -EINVAL; + + dma_fence_set_deadline(sync_file->fence, ns_to_ktime(ts.deadline_ns)); + + return 0; +} + static long sync_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -362,6 +378,9 @@ static long sync_file_ioctl(struct file *file, unsigned int cmd, case SYNC_IOC_FILE_INFO: return sync_file_ioctl_fence_info(sync_file, arg); + case SYNC_IOC_SET_DEADLINE: + return sync_file_ioctl_set_deadline(sync_file, arg); + default: return -ENOTTY; } diff --git a/include/uapi/linux/sync_file.h b/include/uapi/linux/sync_file.h index eced40c204d7..594b8bba7948 100644 --- a/include/uapi/linux/sync_file.h +++ b/include/uapi/linux/sync_file.h @@ -76,6 +76,27 @@ struct sync_file_info { __u64 sync_fence_info; }; +/** + * struct sync_set_deadline - SYNC_IOC_SET_DEADLINE - set a deadline hint on a fence + * @deadline_ns: absolute time of the deadline + * @pad: must be zero + * + * Allows userspace to set a deadline on a fence, see &dma_fence_set_deadline + * + * The timebase for the deadline is CLOCK_MONOTONIC (same as vblank). For + * example + * + * clock_gettime(CLOCK_MONOTONIC, &t); + * deadline_ns = (t.tv_sec * 1000000000L) + t.tv_nsec + ns_until_deadline + */ +struct sync_set_deadline { + __u64 deadline_ns; + /* Not strictly needed for alignment but gives some possibility + * for future extension: + */ + __u64 pad; +}; + #define SYNC_IOC_MAGIC '>' /** @@ -87,5 +108,6 @@ struct sync_file_info { #define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data) #define SYNC_IOC_FILE_INFO _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info) +#define SYNC_IOC_SET_DEADLINE _IOW(SYNC_IOC_MAGIC, 5, struct sync_set_deadline) #endif /* _UAPI_LINUX_SYNC_H */