From patchwork Tue May 25 21:17:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jason Ekstrand X-Patchwork-Id: 12280179 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E447C47088 for ; Tue, 25 May 2021 21:18:30 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 6AE52611BE for ; Tue, 25 May 2021 21:18:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6AE52611BE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=jlekstrand.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C44BE89A4B; Tue, 25 May 2021 21:18:23 +0000 (UTC) Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by gabe.freedesktop.org (Postfix) with ESMTPS id 120AB6EB46 for ; Tue, 25 May 2021 21:18:14 +0000 (UTC) Received: by mail-pl1-x631.google.com with SMTP id s4so15474056plg.12 for ; Tue, 25 May 2021 14:18:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jlekstrand-net.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=2Zomxth+WuiC0IHgmdncpOPr5o6JQyY+ikQtNjEMgrQ=; b=qJIec8BequFpbl+oVYyw7tmxYT3paf9hpAqm3gLAv1n/WrVrei8i5XHXMiKCPxPj3f btJElvhCBVGPqEQiOtssRGm/9bcf9N8StvYzJ6FdTHTdE4wkQqUXiuYCd3o/N3LV6NBK PwmkJZ+vK+dbGRgdbCOCG/rWqPrVFdvwnyyq1jQ+CVIvsB8wNzN+TsfryoDtebZxIQ4R QOpDA6qqC4f9+SZn5tugi236CXyFwKMo5PkzXOgew8TwjINaA8I79EryRchAzhFpHYKs Gk8FvGFE3dijjxDVT6B/KzdD0R/0myjEOXxfbnzTcSaQcmLfYYQtXTzRGruhG5Hy4tIP WZog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=2Zomxth+WuiC0IHgmdncpOPr5o6JQyY+ikQtNjEMgrQ=; b=r7EXp2HRGEccmJAjOPgBKJEoStNchxZVznOjY9uHziH03oIDTMwmSk9YdwxZUAqECp I0azpqdswc1ynuMsk6O52cg56urflJ10YMff97zwhjW4WElIkEuf6WQV2A7Mt3MwtzT3 zeBkQQQYMW3boxS7nJ2twYp5Ta5QV3WG8ouG0Gg0eHvSdbPxnWcokFqA0sGvcOAIkMxs XbqUcqyyp93/gpmIxURMcRHDdxdTVLlnpqvsP/ENta0FVQPfGV6GH5UJ3r2eHIC8piuY jhHJHBJa35WEra+9++Cbr+NbMQZb37yY6pQyD0YNxTLYtbnFtpdtkVC74LPHljMjs2o2 RyDQ== X-Gm-Message-State: AOAM5310oBefDhETe/MNXVINyB9zWYzKrxddpgl0Zit3pEPWbasXz09D lhmSClLbCFi63fECIs11rXtwYw== X-Google-Smtp-Source: ABdhPJzAPXz0yewfnqZlrDIupak3VBLdb4uKxv8DCVTUymb0HjVcU6+d0kC+y+rSxM53sVsqH18pnQ== X-Received: by 2002:a17:90a:880c:: with SMTP id s12mr32796620pjn.66.1621977493521; Tue, 25 May 2021 14:18:13 -0700 (PDT) Received: from omlet.lan ([134.134.139.83]) by smtp.gmail.com with ESMTPSA id e186sm14342278pfa.145.2021.05.25.14.18.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 May 2021 14:18:13 -0700 (PDT) From: Jason Ekstrand To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Date: Tue, 25 May 2021 16:17:53 -0500 Message-Id: <20210525211753.1086069-8-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210525211753.1086069-1-jason@jlekstrand.net> References: <20210525211753.1086069-1-jason@jlekstrand.net> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 7/7] RFC: dma-buf: Add an API for importing sync files (v7) X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , =?utf-8?q?Christian_K=C3=B6nig?= , Sumit Semwal Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This patch is analogous to the previous sync file export patch in that it allows you to import a sync_file into a dma-buf. Unlike the previous patch, however, this does add genuinely new functionality to dma-buf. Without this, the only way to attach a sync_file to a dma-buf is to submit a batch to your driver of choice which waits on the sync_file and claims to write to the dma-buf. Even if said batch is a no-op, a submit is typically way more overhead than just attaching a fence. A submit may also imply extra synchronization with other work because it happens on a hardware queue. In the Vulkan world, this is useful for dealing with the out-fence from vkQueuePresent. Current Linux window-systems (X11, Wayland, etc.) all rely on dma-buf implicit sync. Since Vulkan is an explicit sync API, we get a set of fences (VkSemaphores) in vkQueuePresent and have to stash those as an exclusive (write) fence on the dma-buf. We handle it in Mesa today with the above mentioned dummy submit trick. This ioctl would allow us to set it directly without the dummy submit. This may also open up possibilities for GPU drivers to move away from implicit sync for their kernel driver uAPI and instead provide sync files and rely on dma-buf import/export for communicating with other implicit sync clients. We make the explicit choice here to only allow setting RW fences which translates to an exclusive fence on the dma_resv. There's no use for read-only fences for communicating with other implicit sync userspace and any such attempts are likely to be racy at best. When we got to insert the RW fence, the actual fence we set as the new exclusive fence is a combination of the sync_file provided by the user and all the other fences on the dma_resv. This ensures that the newly added exclusive fence will never signal before the old one would have and ensures that we don't break any dma_resv contracts. We require userspace to specify RW in the flags for symmetry with the export ioctl and in case we ever want to support read fences in the future. There is one downside here that's worth documenting: If two clients writing to the same dma-buf using this API race with each other, their actions on the dma-buf may happen in parallel or in an undefined order. Both with and without this API, the pattern is the same: Collect all the fences on dma-buf, submit work which depends on said fences, and then set a new exclusive (write) fence on the dma-buf which depends on said work. The difference is that, when it's all handled by the GPU driver's submit ioctl, the three operations happen atomically under the dma_resv lock. If two userspace submits race, one will happen before the other. You aren't guaranteed which but you are guaranteed that they're strictly ordered. If userspace manages the fences itself, then these three operations happen separately and the two render operations may happen genuinely in parallel or get interleaved. However, this is a case of userspace racing with itself. As long as we ensure userspace can't back the kernel into a corner, it should be fine. v2 (Jason Ekstrand): - Use a wrapper dma_fence_array of all fences including the new one when importing an exclusive fence. v3 (Jason Ekstrand): - Lock around setting shared fences as well as exclusive - Mark SIGNAL_SYNC_FILE as a read-write ioctl. - Initialize ret to 0 in dma_buf_wait_sync_file v4 (Jason Ekstrand): - Use the new dma_resv_get_singleton helper v5 (Jason Ekstrand): - Rename the IOCTLs to import/export rather than wait/signal - Drop the WRITE flag and always get/set the exclusive fence v6 (Jason Ekstrand): - Split import and export into separate patches - New commit message v7 (Daniel Vetter): - Fix the uapi header to use the right struct in the ioctl - Use a separate dma_buf_import_sync_file struct - Add kerneldoc for dma_buf_import_sync_file Signed-off-by: Jason Ekstrand Cc: Christian König Cc: Daniel Vetter Cc: Sumit Semwal Cc: Maarten Lankhorst --- drivers/dma-buf/dma-buf.c | 36 ++++++++++++++++++++++++++++++++++++ include/uapi/linux/dma-buf.h | 22 ++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index ea117de962903..098340222662b 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -422,6 +422,40 @@ static long dma_buf_export_sync_file(struct dma_buf *dmabuf, put_unused_fd(fd); return ret; } + +static long dma_buf_import_sync_file(struct dma_buf *dmabuf, + const void __user *user_data) +{ + struct dma_buf_import_sync_file arg; + struct dma_fence *fence, *singleton = NULL; + int ret = 0; + + if (copy_from_user(&arg, user_data, sizeof(arg))) + return -EFAULT; + + if (arg.flags != DMA_BUF_SYNC_RW) + return -EINVAL; + + fence = sync_file_get_fence(arg.fd); + if (!fence) + return -EINVAL; + + dma_resv_lock(dmabuf->resv, NULL); + + singleton = dma_resv_get_singleton_unlocked(dmabuf->resv, fence); + if (IS_ERR(singleton)) { + ret = PTR_ERR(singleton); + } else if (singleton) { + dma_resv_add_excl_fence(dmabuf->resv, singleton); + dma_resv_add_shared_fence(dmabuf->resv, singleton); + } + + dma_resv_unlock(dmabuf->resv); + + dma_fence_put(fence); + + return ret; +} #endif static long dma_buf_ioctl(struct file *file, @@ -470,6 +504,8 @@ static long dma_buf_ioctl(struct file *file, #if IS_ENABLED(CONFIG_SYNC_FILE) case DMA_BUF_IOCTL_EXPORT_SYNC_FILE: return dma_buf_export_sync_file(dmabuf, (void __user *)arg); + case DMA_BUF_IOCTL_IMPORT_SYNC_FILE: + return dma_buf_import_sync_file(dmabuf, (const void __user *)arg); #endif default: diff --git a/include/uapi/linux/dma-buf.h b/include/uapi/linux/dma-buf.h index aeba45180b028..af53987db24be 100644 --- a/include/uapi/linux/dma-buf.h +++ b/include/uapi/linux/dma-buf.h @@ -101,6 +101,27 @@ struct dma_buf_export_sync_file { __s32 fd; }; +/** + * struct dma_buf_import_sync_file - Insert a sync_file into a dma-buf + * + * Userspace can perform a DMA_BUF_IOCTL_IMPORT_SYNC_FILE to insert a + * sync_file into a dma-buf for the purposes of implicit synchronization + * with other dma-buf consumers. This allows clients using explicitly + * synchronized APIs such as Vulkan to inter-op with dma-buf consumers + * which expect implicit synchronization such as OpenGL or most media + * drivers/video. + */ +struct dma_buf_import_sync_file { + /** + * @flags: Read/write flags + * + * Must be DMA_BUF_SYNC_RW. + */ + __u32 flags; + /** @fd: Sync file descriptor */ + __s32 fd; +}; + #define DMA_BUF_BASE 'b' #define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync) @@ -111,5 +132,6 @@ struct dma_buf_export_sync_file { #define DMA_BUF_SET_NAME_A _IOW(DMA_BUF_BASE, 1, u32) #define DMA_BUF_SET_NAME_B _IOW(DMA_BUF_BASE, 1, u64) #define DMA_BUF_IOCTL_EXPORT_SYNC_FILE _IOWR(DMA_BUF_BASE, 2, struct dma_buf_export_sync_file) +#define DMA_BUF_IOCTL_IMPORT_SYNC_FILE _IOW(DMA_BUF_BASE, 3, struct dma_buf_import_sync_file) #endif