From mboxrd@z Thu Jan 1 00:00:00 1970 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,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 68788C433FE for ; Fri, 10 Sep 2021 08:27:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 48A36611C5 for ; Fri, 10 Sep 2021 08:27:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231773AbhIJI2L (ORCPT ); Fri, 10 Sep 2021 04:28:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231502AbhIJI2L (ORCPT ); Fri, 10 Sep 2021 04:28:11 -0400 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFFE6C061574 for ; Fri, 10 Sep 2021 01:27:00 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id d6so1431550wrc.11 for ; Fri, 10 Sep 2021 01:27:00 -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=L5dIDlEb7TduptKFQf5pK4qlvzDeGzLljRLEJA4EwpM=; b=QW6FYNP8uWQsUwkM+c2KEOZQm7ch4KK8iurjtNDTAvKtWmZE4r20QbTXnvVoInNXFh I7CN9X+8zzZoK1KL0eUraoxtzTDITqDsUpmOc1u4Nei2q5Yp45m9N+z9uk/1OCJrbtAG fYlKCa08xPnWgmcjF7LeMk1AQCSrKGsamk+vv0CopILztqQbLxweSJQCkoj7LsjnajTZ ToMceDb48xf7m3n+i5u+/TsFA9+61JOiwuuKOtN2DGvBkzpMSAyEhN+MwrLrGDQa1fFq YHqdamSaec5BWtoB9n3W483ecyZFV1rDM981m33J7vZXNmq2oX28oqUggo/RllieZul3 tfcg== 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=L5dIDlEb7TduptKFQf5pK4qlvzDeGzLljRLEJA4EwpM=; b=B5/4pw5Wq4rngDQb7rhtATmfnGIO2ZKGpRGS8918l6Oja6R0D8PDdxV81zWthfsSrW yBSWF1QVMmjZ3qcpzXyESKyOw7/hRv9M8ZvnY8MKX2suMfxIKAjXAfufH1gxY2X5QOwU L431KFvUrBksqgVL7OBUmtOFn+EErlZ1pFaBehrSKw4nMjpP4ic01Ksv//5PWHoNCqQu OQQsMb3H8kl2yK6HqOyLwvV5+XE4W6iB/R9x85ApsYzlvPgRcRD6Xdhe3U4/h3X5nIN/ dfOPxtSBU+qCXRlJilB0qnRyICFgRNO584K2Ouvp8unr4qXLtHFL+W2zh+rsEZTJzPRE TNMA== X-Gm-Message-State: AOAM531p8/4rk0uhcBj9xd7AHwc3xdS+DMC/bvA4sjJY4zYZM0x2p5gM iqDhYWFp2+/LNFilwmfBxNo= X-Google-Smtp-Source: ABdhPJw0H96EVho6e+D7qCMJS8mWk4G39tWkKOX4/EPVrxRLEx5atvunrpg6COw8vyus+jXx7vZbKw== X-Received: by 2002:adf:e645:: with SMTP id b5mr8469261wrn.34.1631262419343; Fri, 10 Sep 2021 01:26:59 -0700 (PDT) Received: from abel.fritz.box (p5b0ea1b5.dip0.t-ipconnect.de. [91.14.161.181]) by smtp.gmail.com with ESMTPSA id l10sm4429756wrg.50.2021.09.10.01.26.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Sep 2021 01:26:58 -0700 (PDT) From: "=?UTF-8?q?Christian=20K=C3=B6nig?=" X-Google-Original-From: =?UTF-8?q?Christian=20K=C3=B6nig?= To: linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org Cc: daniel@ffwll.ch Subject: [PATCH 03/14] dma-buf: use new iterator in dma_resv_copy_fences Date: Fri, 10 Sep 2021 10:26:44 +0200 Message-Id: <20210910082655.82168-3-christian.koenig@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210910082655.82168-1-christian.koenig@amd.com> References: <20210910082655.82168-1-christian.koenig@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This makes the function much simpler since the complex retry logic is now handled else where. Signed-off-by: Christian König --- drivers/dma-buf/dma-resv.c | 81 +++++++++++++++----------------------- 1 file changed, 32 insertions(+), 49 deletions(-) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 8cbccaae169d..9a9c0bba772b 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -433,74 +433,57 @@ EXPORT_SYMBOL_GPL(dma_resv_walk_unlocked); */ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src) { - struct dma_resv_list *src_list, *dst_list; - struct dma_fence *old, *new; - unsigned int i; + struct dma_resv_cursor cursor; + struct dma_resv_list *list; + struct dma_fence *f, *excl; dma_resv_assert_held(dst); - rcu_read_lock(); - src_list = dma_resv_shared_list(src); + list = NULL; + excl = NULL; -retry: - if (src_list) { - unsigned int shared_count = src_list->shared_count; + rcu_read_lock(); + dma_resv_for_each_fence_unlocked(dst, &cursor, true, f) { - rcu_read_unlock(); + if (cursor.is_first) { + dma_resv_list_free(list); + dma_fence_put(excl); - dst_list = dma_resv_list_alloc(shared_count); - if (!dst_list) - return -ENOMEM; + if (cursor.fences) { + unsigned int cnt = cursor.fences->shared_count; - rcu_read_lock(); - src_list = dma_resv_shared_list(src); - if (!src_list || src_list->shared_count > shared_count) { - kfree(dst_list); - goto retry; - } + rcu_read_unlock(); + list = dma_resv_list_alloc(cnt); + if (!list) + return -ENOMEM; - dst_list->shared_count = 0; - for (i = 0; i < src_list->shared_count; ++i) { - struct dma_fence __rcu **dst; - struct dma_fence *fence; + list->shared_count = 0; + rcu_read_lock(); - fence = rcu_dereference(src_list->shared[i]); - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, - &fence->flags)) - continue; - - if (!dma_fence_get_rcu(fence)) { - dma_resv_list_free(dst_list); - src_list = dma_resv_shared_list(src); - goto retry; + } else { + list = NULL; } + excl = NULL; + } - if (dma_fence_is_signaled(fence)) { - dma_fence_put(fence); - continue; - } + if (cursor.is_exclusive) + excl = f; + else + RCU_INIT_POINTER(list->shared[list->shared_count++], f); - dst = &dst_list->shared[dst_list->shared_count++]; - rcu_assign_pointer(*dst, fence); - } - } else { - dst_list = NULL; + /* Don't drop the reference */ + f = NULL; } - new = dma_fence_get_rcu_safe(&src->fence_excl); rcu_read_unlock(); - src_list = dma_resv_shared_list(dst); - old = dma_resv_excl_fence(dst); - write_seqcount_begin(&dst->seq); - /* write_seqcount_begin provides the necessary memory barrier */ - RCU_INIT_POINTER(dst->fence_excl, new); - RCU_INIT_POINTER(dst->fence, dst_list); + excl = rcu_replace_pointer(dst->fence_excl, excl, dma_resv_held(dst)); + list = rcu_replace_pointer(dst->fence, list, dma_resv_held(dst)); write_seqcount_end(&dst->seq); - dma_resv_list_free(src_list); - dma_fence_put(old); + dma_resv_list_free(list); + dma_fence_put(excl); return 0; } -- 2.25.1