From patchwork Fri Oct 1 10:05:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Christian_K=C3=B6nig?= X-Patchwork-Id: 12530469 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99BDCC4332F for ; Fri, 1 Oct 2021 12:10:50 +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 682FC61AE2 for ; Fri, 1 Oct 2021 12:10:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 682FC61AE2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 917286EE33; Fri, 1 Oct 2021 12:10:27 +0000 (UTC) Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by gabe.freedesktop.org (Postfix) with ESMTPS id F20986EDA6; Fri, 1 Oct 2021 10:06:16 +0000 (UTC) Received: by mail-wm1-x32f.google.com with SMTP id b192-20020a1c1bc9000000b0030cfaf18864so6344805wmb.4; Fri, 01 Oct 2021 03:06:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=v4LbHzasULQayC+y/hjohCjdtn1xDHygzW8kntq697M=; b=AJluI3DqUgVPqr2pdUTmoNMEUOTbYCvC8CrWSUQPgcw2ADm8tZ7DUd9U/V3nPpVd7I 1j8ecLCjZ9xw2DnehZPJeDMFvjfDvcceEk7847Y/MDe/72+qJ9mBQVw0JKb/EIsizNaP q+Aej35RF8NTB6HuxnggjeJUp5zFsBYxHuO5UqUe/8INWnkpDZ9+18+WPFg7S4apY6JR eOVwDsB83C+AxTpoAyqaya/1zgdURnMjBg1IIvp86MaFFzubR74Qqx7xLG6N73ZvO4r/ KflvDuzTRdgbDJCqaFBcQ6cSnYXFhJM/AtysbDa6a36uqs8VED/D6/YfW0ys9nwNdLLu ueGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=v4LbHzasULQayC+y/hjohCjdtn1xDHygzW8kntq697M=; b=y2x9vhZF9hwoUm2naWV/DMKn40dkKuYZKnh9rqz0Xepr4fzGHNg1ZwnTYfOtu0yoWw g7TONx0F9QivgcfTJjsX0rkGo1OSUpK4IKpYpE2w/xURY4+xUgkyiRmXblDbn7Fi0aB5 Orn0cewQw81Yt0vi0pEPAn37EsTIeesXAFUTzKqg+OM9mFx/fxDGRH0wBNHXNLcxj33S pKOwzzRw8jd9fqXSBOMQ2t8iUWU6dIvjRk9o92NBppUbSLegAaxR8xkIgxXiLr16aMWG jvPHwLyCxFgk/iZsIEd0sJAQq3/wqDyYE7YDLIGsDaRZytLcxxqL42JJ6KbX1kTtMNdi 0HHw== X-Gm-Message-State: AOAM530rNUifaYDlSYKBn8nHOSqZjq80VSLZ5+2yZzmbUejuicxM/6iM cV8J0Jnpp8ATVD46Nwih27ruvQZjqSk= X-Google-Smtp-Source: ABdhPJxvq+HAvChoc1/EnB92mPvCRlpuvwfmJ9QzOfN9qS0JkdMuVk0zMD6p034f/W2/8PDdj7lN+g== X-Received: by 2002:a1c:e906:: with SMTP id q6mr3792282wmc.126.1633082775419; Fri, 01 Oct 2021 03:06:15 -0700 (PDT) Received: from abel.fritz.box (p5b0ea1b5.dip0.t-ipconnect.de. [91.14.161.181]) by smtp.gmail.com with ESMTPSA id v17sm5746069wro.34.2021.10.01.03.06.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Oct 2021 03:06:15 -0700 (PDT) From: " =?utf-8?q?Christian_K=C3=B6nig?= " X-Google-Original-From: =?utf-8?q?Christian_K=C3=B6nig?= To: linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org Cc: daniel@ffwll.ch, tvrtko.ursulin@linux.intel.com Date: Fri, 1 Oct 2021 12:05:44 +0200 Message-Id: <20211001100610.2899-3-christian.koenig@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211001100610.2899-1-christian.koenig@amd.com> References: <20211001100610.2899-1-christian.koenig@amd.com> MIME-Version: 1.0 X-Mailman-Approved-At: Fri, 01 Oct 2021 12:10:22 +0000 Subject: [Intel-gfx] [PATCH 02/28] dma-buf: add dma_resv_for_each_fence 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" A simpler version of the iterator to be used when the dma_resv object is locked. Signed-off-by: Christian König --- drivers/dma-buf/dma-resv.c | 46 ++++++++++++++++++++++++++++++++++++++ include/linux/dma-resv.h | 19 ++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 3cbcf66a137e..a104197d12b5 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -423,6 +423,52 @@ struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor) } EXPORT_SYMBOL(dma_resv_iter_next_unlocked); +/** + * dma_resv_iter_first - first fence from a locked dma_resv object + * @cursor: cursor to record the current position + * + * Return all the fences in the dma_resv object while holding the + * &dma_resv.lock. + */ +struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor) +{ + struct dma_fence *fence; + + dma_resv_assert_held(cursor->obj); + + cursor->index = -1; + cursor->fences = dma_resv_shared_list(cursor->obj); + + fence = dma_resv_excl_fence(cursor->obj); + if (!fence) + fence = dma_resv_iter_next(cursor); + + cursor->is_restarted = true; + return fence; +} +EXPORT_SYMBOL_GPL(dma_resv_iter_first); + +/** + * dma_resv_iter_next - next fence from a locked dma_resv object + * @cursor: cursor to record the current position + * + * Return all the fences in the dma_resv object while holding the + * &dma_resv.lock. + */ +struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor) +{ + dma_resv_assert_held(cursor->obj); + + cursor->is_restarted = false; + if (!cursor->all_fences || !cursor->fences || + ++cursor->index >= cursor->fences->shared_count) + return NULL; + + return rcu_dereference_protected(cursor->fences->shared[cursor->index], + dma_resv_held(cursor->obj)); +} +EXPORT_SYMBOL_GPL(dma_resv_iter_next); + /** * dma_resv_copy_fences - Copy all fences from src to dst. * @dst: the destination reservation object diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index 5d7d28cb9008..d4b4cd43f0f1 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -179,6 +179,8 @@ struct dma_resv_iter { struct dma_fence *dma_resv_iter_first_unlocked(struct dma_resv_iter *cursor); struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor); +struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor); +struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor); /** * dma_resv_iter_begin - initialize a dma_resv_iter object @@ -244,6 +246,23 @@ static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor) for (fence = dma_resv_iter_first_unlocked(cursor); \ fence; fence = dma_resv_iter_next_unlocked(cursor)) +/** + * dma_resv_for_each_fence - fence iterator + * @cursor: a struct dma_resv_iter pointer + * @obj: a dma_resv object pointer + * @all_fences: true if all fences should be returned + * @fence: the current fence + * + * Iterate over the fences in a struct dma_resv object while holding the + * &dma_resv.lock. @all_fences controls if the shared fences are returned as + * well. The cursor initialisation is part of the iterator and the fence stays + * valid as long as the lock is held. + */ +#define dma_resv_for_each_fence(cursor, obj, all_fences, fence) \ + for (dma_resv_iter_begin(cursor, obj, all_fences), \ + fence = dma_resv_iter_first(cursor); fence; \ + fence = dma_resv_iter_next(cursor)) + #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base) #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)