From patchwork Wed Jan 20 21:09:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 12033867 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 25F36C433DB for ; Wed, 20 Jan 2021 23:42:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E769923603 for ; Wed, 20 Jan 2021 23:42:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733062AbhATWLy (ORCPT ); Wed, 20 Jan 2021 17:11:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731530AbhATVKX (ORCPT ); Wed, 20 Jan 2021 16:10:23 -0500 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C26E5C0613D6 for ; Wed, 20 Jan 2021 13:09:42 -0800 (PST) Received: by mail-pj1-x1036.google.com with SMTP id g15so3022826pjd.2 for ; Wed, 20 Jan 2021 13:09:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5p3XfY6TOWEdcAK7xdoxc0ak2IFt6vsK1MpKBtv9a0E=; b=dIylZNXUT8UQ3UamF1ogl2nvky0NOqNfe4p5pAKibTyvbKpekUSnf9ybDFs54ibA61 C/ZTwYE6NnSTMniIt78BwgL8jFAh3+rjQvmEWrMrKSJKxbkS0hz96dBKkbEbw9gtFk18 KYuxSgNMJkmdWQ8aLW21q7KBpR80cNf8dfF8N2tIS4SgJpoyaXfqI8wcVAXoTU0krNs6 gdYQeDCNH6YNcse2uf33htcQmPbFox6z6dKVg1FTtNAccuiwdwNizrjmiGcGMnc+kPU+ uA6gayZCbJYLyJQXyg1ltt7mbeoFgUj879fNhy/VNvLDe6KbpVOg4yo1OSBtH16wV3xG JLMg== 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=5p3XfY6TOWEdcAK7xdoxc0ak2IFt6vsK1MpKBtv9a0E=; b=fC8jtK2+nO4Vr+cZ/mjHJmrEZLWpmTcCWImzXPaulsN6tvI4ol+Vf5qilE5qzWlaGr bABWd2tby4FqyFiiu8cdhx5HSjnajnRoPr7AYE7a7wFnY28lucqvgVLRO50WSmOFRT3C RB9EdhtCBnmNR6ykY2uvmaHvcU0FsJf79eK709LNXFxPje5t08kDCtSo7CBhhgP21IXf PrHIKGnyZedXlhfPB9OxnzvAMG7FSaoEtR3d2mhq1KHSdqz1K4XCDnuGNPM7MWveZVLq 4kgGjulqLDs3nxcFrw9lXpbWdIdE9amra9guX8Q4vagjU+7MVO6PhEI6rAb+uQH/PtTq tgZA== X-Gm-Message-State: AOAM530W3DxCU4ZiXX2GbhtpW7K8B34aYXQqCYW5F1Fm/lC6E+ywSUZT R3uF/Px5j7Tko0nPI4Ge14o6ow== X-Google-Smtp-Source: ABdhPJws6ddONO6NY88RoQ3BGsVYEJuaBeog/gKtwE5U4aqwU6w4J5JtoB3QT6Z/CXX0IqrItU/FPA== X-Received: by 2002:a17:902:b203:b029:dc:973:3ad0 with SMTP id t3-20020a170902b203b02900dc09733ad0mr11671800plr.44.1611176982332; Wed, 20 Jan 2021 13:09:42 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id f15sm3265629pja.24.2021.01.20.13.09.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jan 2021 13:09:41 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Daniel Vetter , Sumit Semwal , Liam Mark , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , Chris Goldsworthy , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , Bing Song , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH 1/3] dma-buf: dma-heap: Keep track of the heap device struct Date: Wed, 20 Jan 2021 21:09:35 +0000 Message-Id: <20210120210937.15069-2-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210120210937.15069-1-john.stultz@linaro.org> References: <20210120210937.15069-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Keep track of the heap device struct. This will be useful for special DMA allocations and actions. Cc: Daniel Vetter Cc: Sumit Semwal Cc: Liam Mark Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Chris Goldsworthy Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: Bing Song Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- drivers/dma-buf/dma-heap.c | 33 +++++++++++++++++++++++++-------- include/linux/dma-heap.h | 9 +++++++++ 2 files changed, 34 insertions(+), 8 deletions(-) diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index afd22c9dbdcf..72c746755d89 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -30,6 +30,7 @@ * @heap_devt heap device node * @list list head connecting to list of heaps * @heap_cdev heap char device + * @heap_dev heap device struct * * Represents a heap of memory from which buffers can be made. */ @@ -40,6 +41,7 @@ struct dma_heap { dev_t heap_devt; struct list_head list; struct cdev heap_cdev; + struct device *heap_dev; }; static LIST_HEAD(heap_list); @@ -190,10 +192,21 @@ void *dma_heap_get_drvdata(struct dma_heap *heap) return heap->priv; } +/** + * dma_heap_get_dev() - get device struct for the heap + * @heap: DMA-Heap to retrieve device struct from + * + * Returns: + * The device struct for the heap. + */ +struct device *dma_heap_get_dev(struct dma_heap *heap) +{ + return heap->heap_dev; +} + struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) { struct dma_heap *heap, *h, *err_ret; - struct device *dev_ret; unsigned int minor; int ret; @@ -247,16 +260,20 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) goto err1; } - dev_ret = device_create(dma_heap_class, - NULL, - heap->heap_devt, - NULL, - heap->name); - if (IS_ERR(dev_ret)) { + heap->heap_dev = device_create(dma_heap_class, + NULL, + heap->heap_devt, + NULL, + heap->name); + if (IS_ERR(heap->heap_dev)) { pr_err("dma_heap: Unable to create device\n"); - err_ret = ERR_CAST(dev_ret); + err_ret = ERR_CAST(heap->heap_dev); goto err2; } + + /* Make sure it doesn't disappear on us */ + heap->heap_dev = get_device(heap->heap_dev); + /* Add heap to the list */ mutex_lock(&heap_list_lock); list_add(&heap->list, &heap_list); diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h index 454e354d1ffb..82857e096910 100644 --- a/include/linux/dma-heap.h +++ b/include/linux/dma-heap.h @@ -50,6 +50,15 @@ struct dma_heap_export_info { */ void *dma_heap_get_drvdata(struct dma_heap *heap); +/** + * dma_heap_get_dev() - get device struct for the heap + * @heap: DMA-Heap to retrieve device struct from + * + * Returns: + * The device struct for the heap. + */ +struct device *dma_heap_get_dev(struct dma_heap *heap); + /** * dma_heap_add - adds a heap to dmabuf heaps * @exp_info: information needed to register this heap