From patchwork Mon May 24 20:59:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jason Ekstrand X-Patchwork-Id: 12276969 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,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 8B0D6C2B9F7 for ; Mon, 24 May 2021 21:00:48 +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 55B8561413 for ; Mon, 24 May 2021 21:00:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 55B8561413 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=jlekstrand.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 75B5D6E95C; Mon, 24 May 2021 21:00:34 +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 14D436E95B for ; Mon, 24 May 2021 21:00:10 +0000 (UTC) Received: by mail-pl1-x631.google.com with SMTP id h12so3089804plf.11 for ; Mon, 24 May 2021 14:00:10 -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=9QA2gacsjSb9O8RWGnCdjII3ht0ANX+ui30IfOJeiRQ=; b=u5QJ1aJWTsdACkjSnLxq2efxwb+Af0KIRBL7bsmlbI7C3eCa35CB2+rDlgVhOADxv8 dwbwnfJ5VFNU9868FoUF/gZ46w0LUvhIGNw96zOiY6SAsgeO16uXRZjL6hHaKncz9mGv gRpRi3ha0zluger5x4uzbfksEklAif2IKfNR3I3iOjNN8ZYqGKauSCLZMa0s8jT++AU8 T03HbgIVTZ/Uv48lRXX5X39Y1V09TOMix6rfr0cgxAjrj2KmypZ5KhDFBaXBJ6j6XAeG eoAdxV36QhvmPOL4zQIbRiVYc0TaiJERUuvPH68laqXvYUPZ6DeK8NKI1V/eMELF1i5U iuCw== 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=9QA2gacsjSb9O8RWGnCdjII3ht0ANX+ui30IfOJeiRQ=; b=h5wxTMiNuGg8OJjfwplffGJtf6WxRjFtVbflTUsQeSQjxuL5p9EdiJEmtm0XoWbbhM nOxz+PzyjBKjkZYIj/YyQJZskJ+KpU6XK7lPh1QeqQFK/zbJH0m+jyME+ABsYdV574Ik 1T4qJQhHOyUT1F+AjmigSDFaEpQiEfZPOBgX+3+LpmLPWRATe/21SBczfAx/KZW2RRhk oMuQxOW/iWMK4gTSHcX94vbmKy4Va8e3Il96bMpyb0ACWLvZ98ScZcLKbjepOpzpx8EA xKDVmO4KCyzSzz5ow1jIHOT0lVWvUziUCR61e85vfyjwa+rOfiEWFEJI8M3YhdtO8GDM RoKg== X-Gm-Message-State: AOAM530W6DtE6k2iRVdaUg6sAVN3pGLOmdIi9O1qcAiBaqwnD+tBKpYG HBofPijLCcZyI0+TRQTVa6aB3eOP6E91Ag== X-Google-Smtp-Source: ABdhPJz23Af8/WpFea9vPKKUUiSGgVWzwQ5SCv2CX7qRu9ipESHuzr6Ad3EGMQiPT/K/RIigR1/NuQ== X-Received: by 2002:a17:90a:284a:: with SMTP id p10mr27140499pjf.198.1621890009134; Mon, 24 May 2021 14:00:09 -0700 (PDT) Received: from omlet.com ([134.134.139.76]) by smtp.gmail.com with ESMTPSA id c195sm12354958pfb.144.2021.05.24.14.00.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 May 2021 14:00:08 -0700 (PDT) From: Jason Ekstrand To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Subject: [PATCH 3/6] dma-buf: add dma_resv_get_singleton_unlocked (v4) Date: Mon, 24 May 2021 15:59:51 -0500 Message-Id: <20210524205954.872814-4-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210524205954.872814-1-jason@jlekstrand.net> References: <20210524205954.872814-1-jason@jlekstrand.net> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , Jason Ekstrand Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add a helper function to get a single fence representing all fences in a dma_resv object. This fence is either the only one in the object or all not signaled fences of the object in a flatted out dma_fence_array. v2 (Jason Ekstrand): - Take reference of fences both for creating the dma_fence_array and in the case where we return one fence. - Handle the case where dma_resv_get_list() returns NULL v3 (Jason Ekstrand): - Add an _rcu suffix because it is read-only - Rewrite to use dma_resv_get_fences_rcu so it's RCU-safe - Add an EXPORT_SYMBOL_GPL declaration - Re-author the patch to Jason since very little is left of Christian König's original patch - Remove the extra fence argument v4 (Jason Ekstrand): - Restore the extra fence argument v5 (Daniel Vetter): - Rename from _rcu to _unlocked since it doesn't leak RCU details to the caller - Fix docs - Use ERR_PTR for error handling rather than an output dma_fence** v5 (Jason Ekstrand): - Drop the extra fence param and leave that to a separate patch Signed-off-by: Jason Ekstrand Reviewed-by: Daniel Vetter --- drivers/dma-buf/dma-resv.c | 93 ++++++++++++++++++++++++++++++++++++++ include/linux/dma-resv.h | 2 + 2 files changed, 95 insertions(+) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index d6f1ed4cd4d55..312a3a59dac6a 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -33,6 +33,8 @@ */ #include +#include +#include #include #include #include @@ -49,6 +51,11 @@ * write-side updates. */ +/* deep dive into the fence containers */ +#define dma_fence_deep_dive_for_each(fence, chain, index, head) \ + dma_fence_chain_for_each(chain, head) \ + dma_fence_array_for_each(fence, index, chain) + DEFINE_WD_CLASS(reservation_ww_class); EXPORT_SYMBOL(reservation_ww_class); @@ -517,6 +524,92 @@ int dma_resv_get_fences_unlocked(struct dma_resv *obj, } EXPORT_SYMBOL_GPL(dma_resv_get_fences_unlocked); +/** + * dma_resv_get_singleton_unlocked - get a single fence for the dma_resv object + * @obj: the reservation object + * @result: resulting dma_fence + * + * Get a single fence representing all unsignaled fences in the dma_resv object + * plus the given extra fence. If we got only one fence return a new + * reference to that, otherwise return a dma_fence_array object. + * + * RETURNS + * Returns -NOMEM if allocations fail, zero otherwise. + */ +struct dma_fence *dma_resv_get_singleton_unlocked(struct dma_resv *obj) +{ + struct dma_fence *result, **resv_fences, *fence, *chain, **fences; + struct dma_fence_array *array; + unsigned int num_resv_fences, num_fences; + unsigned int err, i, j; + + err = dma_resv_get_fences_unlocked(obj, NULL, &num_resv_fences, &resv_fences); + if (err) + return ERR_PTR(err); + + if (num_resv_fences == 0) + return NULL; + + num_fences = 0; + result = NULL; + + for (i = 0; i < num_resv_fences; ++i) { + dma_fence_deep_dive_for_each(fence, chain, j, resv_fences[i]) { + if (dma_fence_is_signaled(fence)) + continue; + + result = fence; + ++num_fences; + } + } + + if (num_fences <= 1) { + result = dma_fence_get(result); + goto put_resv_fences; + } + + fences = kmalloc_array(num_fences, sizeof(struct dma_fence*), + GFP_KERNEL); + if (!fences) { + result = ERR_PTR(-ENOMEM); + goto put_resv_fences; + } + + num_fences = 0; + for (i = 0; i < num_resv_fences; ++i) { + dma_fence_deep_dive_for_each(fence, chain, j, resv_fences[i]) { + if (!dma_fence_is_signaled(fence)) + fences[num_fences++] = dma_fence_get(fence); + } + } + + if (num_fences <= 1) { + result = num_fences ? fences[0] : NULL; + kfree(fences); + goto put_resv_fences; + } + + array = dma_fence_array_create(num_fences, fences, + dma_fence_context_alloc(1), + 1, false); + if (array) { + result = &array->base; + } else { + result = ERR_PTR(-ENOMEM); + while (num_fences--) + dma_fence_put(fences[num_fences]); + kfree(fences); + } + +put_resv_fences: + while (num_resv_fences--) + dma_fence_put(resv_fences[num_resv_fences]); + kfree(resv_fences); + + return result; +} +EXPORT_SYMBOL_GPL(dma_resv_get_singleton_unlocked); + /** * dma_resv_wait_timeout_unlocked - Wait on reservation's objects * shared and/or exclusive fences. diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index 99926680c3964..c529ccee94bc5 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -285,6 +285,8 @@ int dma_resv_get_fences_unlocked(struct dma_resv *obj, int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src); +struct dma_fence *dma_resv_get_singleton_unlocked(struct dma_resv *obj); + long dma_resv_wait_timeout_unlocked(struct dma_resv *obj, bool wait_all, bool intr, unsigned long timeout);