From patchwork Fri Sep 17 12:34:49 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: 12501831 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 3AA1FC433EF for ; Fri, 17 Sep 2021 12:35:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 238C5611C8 for ; Fri, 17 Sep 2021 12:35:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244187AbhIQMgo (ORCPT ); Fri, 17 Sep 2021 08:36:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244176AbhIQMgl (ORCPT ); Fri, 17 Sep 2021 08:36:41 -0400 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D150C061764 for ; Fri, 17 Sep 2021 05:35:19 -0700 (PDT) Received: by mail-wr1-x42d.google.com with SMTP id i23so14966408wrb.2 for ; Fri, 17 Sep 2021 05:35:19 -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=Hq6P+apu5QddcJBxT2CG/al9Lr42cPbE+iNSMYU+UVY=; b=amvRmOwHV67bbo1i+CVbkv10A+JbdSkOSB1vD0Q1i6Fx+68k/VvP9QGuBbtA06pg9B 9h/qsezNPrrjHikRUslbltcjZ1ODeSAOCjnY8h7trNOvVO14eqAT5nTy4uW/qJnB9NSq NDHp14nzFIwrG1ib5yXZLdkrV12J3+E3WisTbv2avlR7RPEdh0nmi9gE76xBfekVkGIV djOHOKL/coO1fqbtMScS5VlQhPuH/x1Aa0twErApdU5OQvwNm6NNkNsi2RAEBrz5kOvh iXNIjU4SsLTkwoyr/zV0zv1191nCM78wB4rYUiyg7QwI6XT3LSVohzWBYjdZLpJOK3yn oIKw== 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=Hq6P+apu5QddcJBxT2CG/al9Lr42cPbE+iNSMYU+UVY=; b=cr/zp18cJlyv69qbI1lV1Nhazgki2zktb13hTI5baDjy4WqUJY8ID++1YFNsCriOfV XDO1k42r1ikczL3x7yG5XNpM0fPSGT0qO1rhYkDObgssbBNyPSuRHXa3zFO6K0TBIhHK TbMRa40/y1nwPRgA5cLxif0kUnhmfE6g76qfy1isHB5M8CZZG37HOxCX03fCd13mPXow 6lxzWoUYe53vTxptQRkedtmMY2I0lK/CpIN8wrtsA9/3YLUOH5yj1ZmGtdahlRimhz2V NQE+7hSTb3cXTvyjOUrIuNuwQgght40tgHKJCVrvdfHRRsUVJhltqJ4BiJkMSg1rXNX6 K/KA== X-Gm-Message-State: AOAM533uVMaVPdOeGveXcW3BB7Hy3f48BxHIabZrjf3eFHS1RUzIfU/M okKd7d5VRRHsMo//Sng/Xjg= X-Google-Smtp-Source: ABdhPJznMU/ayLHx4F7nt7nhyCxToln+2iLehyrTsiU79E0Izma7IDO7C0N5XoW+cItVQWTWHK5pVQ== X-Received: by 2002:a5d:4d92:: with SMTP id b18mr11979933wru.245.1631882117877; Fri, 17 Sep 2021 05:35:17 -0700 (PDT) Received: from abel.fritz.box (p5b0ea1b5.dip0.t-ipconnect.de. [91.14.161.181]) by smtp.gmail.com with ESMTPSA id l21sm6122049wmh.31.2021.09.17.05.35.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Sep 2021 05:35:17 -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 Subject: [PATCH 02/26] dma-buf: add dma_resv_for_each_fence Date: Fri, 17 Sep 2021 14:34:49 +0200 Message-Id: <20210917123513.1106-3-christian.koenig@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210917123513.1106-1-christian.koenig@amd.com> References: <20210917123513.1106-1-christian.koenig@amd.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 | 33 +++++++++++++++++++++++++++++++++ include/linux/dma-resv.h | 17 +++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 3e77cad2c9d4..a3c79a99fb44 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -384,6 +384,39 @@ struct dma_fence *dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor, } EXPORT_SYMBOL_GPL(dma_resv_iter_walk_unlocked); +/** + * dma_resv_iter_walk - walk over fences in a dma_resv obj + * @cursor: cursor to record the current position + * @first: if we should start over + * + * Return all the fences in the dma_resv object while holding the + * dma_resv::lock. + */ +struct dma_fence *dma_resv_iter_walk(struct dma_resv_iter *cursor, bool first) +{ + dma_resv_assert_held(cursor->obj); + + cursor->is_first = first; + if (first) { + struct dma_fence *fence; + + cursor->index = -1; + cursor->fences = dma_resv_shared_list(cursor->obj); + + fence = dma_resv_excl_fence(cursor->obj); + if (fence) + return fence; + } + + 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_walk); + /** * 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 693d16117153..8c968f8c9d33 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -179,6 +179,7 @@ struct dma_resv_iter { struct dma_fence *dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor, bool first); +struct dma_fence *dma_resv_iter_walk(struct dma_resv_iter *cursor, bool first); /** * dma_resv_iter_begin - initialize a dma_resv_iter object @@ -233,6 +234,22 @@ static inline bool dma_resv_iter_is_exclusive(struct dma_resv_iter *cursor) for (fence = dma_resv_iter_walk_unlocked(cursor, true); \ fence; fence = dma_resv_iter_walk_unlocked(cursor, false)) +/** + * 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. + */ +#define dma_resv_for_each_fence(cursor, obj, all_fences, fence) \ + for (dma_resv_iter_begin(cursor, obj, all_fences), \ + fence = dma_resv_iter_walk(cursor, true); fence; \ + fence = dma_resv_iter_walk(cursor, false)) + #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base) #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)