From patchwork Fri Sep 17 12:34:50 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: 12502049 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=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,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=unavailable 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 28E17C433EF for ; Fri, 17 Sep 2021 13:02:57 +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 D6F0560F48 for ; Fri, 17 Sep 2021 13:02:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D6F0560F48 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 20B246ECB8; Fri, 17 Sep 2021 13:02:51 +0000 (UTC) Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1E2826EC42; Fri, 17 Sep 2021 12:35:20 +0000 (UTC) Received: by mail-wr1-x42d.google.com with SMTP id d6so14867139wrc.11; Fri, 17 Sep 2021 05:35:20 -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=Ipbb4pGWM/3XFhYqg0eQ7bjJFj3sOFyI7ZKdJRE6D0M=; b=mAa7/f9+tf2+hjbJCj8af3ffhew+9MkGBVjBYwijaUa2GndzOvfjywhRYuyHrgzEjh xtSBzSuvfsqpSQLs0bsZM8EdRSUWIRHyvPFPxN7aLX/LZQRTaHFK0Ew65YKvcdg70ZOV 3fJiCCn6yUSLU7Tb/hsIfz9QRduJOhVYYuLE6xr5frmSIiC6o4mTkEyHIJDMjWTn0iM9 jO4PhJsSje9OO+piF5aFjCSD0spX1xS48Fou+M/B7Qq97HbgkT9g2ZykhXqvJJcFamhL 5goZox9ThDmWU4vzCiPi0JuhhvNh/NxH7mVzZdXmlCAV6zmcKl9kENOOQrowKq8iouU3 L1Rw== 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=Ipbb4pGWM/3XFhYqg0eQ7bjJFj3sOFyI7ZKdJRE6D0M=; b=LOFSR+Cs7jlcD/IQc4hvcxXGdQz8UQbIqbrTHTuF1/AQ+kIDfbVuBJYPwM4b9Lf3Sw eXbAZumBq4Dh5iSPVXY0EbBPddbpsqt/LfXuBhDrtdiOK3PDG/gaBaouuJUTbndO9CSM EoELX4oxRt0ugV//AukvoXa0HWQ9g0IE6WR2ZxVia4XQ2xbh+gcreD37ky4YlvaxwLDB bOUtKXV3cDAdygK9HAu1fnRVHajhhCdmPWG4mZT/PUBQhlRSIIC6a9NajqiO6ag9y0I5 8SYA3Qq3/4z4CSGrHLoF52uUC3Z4AHx40ynicdA1eOrfeJMt9mP69IZKO8Ge0gFEIM07 KUnw== X-Gm-Message-State: AOAM531CZbwBTNwLJxOKra4PtKvfP+t/SWrXUOJYodejdtfcHlSXuJPo /iQOQxkdV/+YsjPPvGOilG4= X-Google-Smtp-Source: ABdhPJwTOXrXCvAxWacGW1AiWElE/T+9t49LBa469jBNob+iaJiqRYFm2UdS0ez+WxQeY7AjNFFc7w== X-Received: by 2002:adf:f904:: with SMTP id b4mr11824300wrr.403.1631882118730; Fri, 17 Sep 2021 05:35:18 -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 05:35:18 -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 Date: Fri, 17 Sep 2021 14:34:50 +0200 Message-Id: <20210917123513.1106-4-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 X-Mailman-Approved-At: Fri, 17 Sep 2021 13:02:50 +0000 Subject: [Intel-gfx] [PATCH 03/26] dma-buf: use new iterator in dma_resv_copy_fences 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" This makes the function much simpler since the complex retry logic is now handled else where. Signed-off-by: Christian König Reviewed-by: Daniel Vetter --- drivers/dma-buf/dma-resv.c | 86 ++++++++++++++++---------------------- 1 file changed, 35 insertions(+), 51 deletions(-) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index a3c79a99fb44..406150dea5e4 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -426,74 +426,58 @@ EXPORT_SYMBOL_GPL(dma_resv_iter_walk); */ 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_iter 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); - -retry: - if (src_list) { - unsigned int shared_count = src_list->shared_count; - - rcu_read_unlock(); + list = NULL; + excl = NULL; - dst_list = dma_resv_list_alloc(shared_count); - if (!dst_list) - return -ENOMEM; + rcu_read_lock(); + dma_resv_iter_begin(&cursor, src, true); + dma_resv_for_each_fence_unlocked(&cursor, f) { - rcu_read_lock(); - src_list = dma_resv_shared_list(src); - if (!src_list || src_list->shared_count > shared_count) { - kfree(dst_list); - goto retry; - } + if (cursor.is_first) { + dma_resv_list_free(list); + dma_fence_put(excl); - dst_list->shared_count = 0; - for (i = 0; i < src_list->shared_count; ++i) { - struct dma_fence __rcu **dst; - struct dma_fence *fence; + if (cursor.fences) { + unsigned int cnt = cursor.fences->shared_count; - fence = rcu_dereference(src_list->shared[i]); - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, - &fence->flags)) - continue; + rcu_read_unlock(); + list = dma_resv_list_alloc(cnt); + if (!list) { + dma_resv_iter_end(&cursor); + return -ENOMEM; + } - if (!dma_fence_get_rcu(fence)) { - dma_resv_list_free(dst_list); - src_list = dma_resv_shared_list(src); - goto retry; - } + list->shared_count = 0; + rcu_read_lock(); - if (dma_fence_is_signaled(fence)) { - dma_fence_put(fence); - continue; + } else { + list = NULL; } - - dst = &dst_list->shared[dst_list->shared_count++]; - rcu_assign_pointer(*dst, fence); + excl = NULL; } - } else { - dst_list = NULL; - } - new = dma_fence_get_rcu_safe(&src->fence_excl); + dma_fence_get(f); + if (dma_resv_iter_is_exclusive(&cursor)) + excl = f; + else + RCU_INIT_POINTER(list->shared[list->shared_count++], f); + } + dma_resv_iter_end(&cursor); 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; }