From patchwork Fri Aug 14 06:24:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 11713593 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3EBCF174A for ; Fri, 14 Aug 2020 06:25:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 27807208B3 for ; Fri, 14 Aug 2020 06:25:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="dOPsv7f/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726237AbgHNGZD (ORCPT ); Fri, 14 Aug 2020 02:25:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726110AbgHNGZC (ORCPT ); Fri, 14 Aug 2020 02:25:02 -0400 Received: from mail-pl1-x644.google.com (mail-pl1-x644.google.com [IPv6:2607:f8b0:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B78E1C061757 for ; Thu, 13 Aug 2020 23:25:02 -0700 (PDT) Received: by mail-pl1-x644.google.com with SMTP id y10so2158795plr.11 for ; Thu, 13 Aug 2020 23:25:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=pwDOHGKYvCi61mHFneVF0EduuTKfnrQsk03HbkNHX20=; b=dOPsv7f/wEuHeXmKjjFDeLAv02B1ounW5ulazhQV8hHqRYaoJ6XQBCnvtser32aA0E lgWuqqXH8kA0synMTCgHcFY7N2wuxSKoFOHOV6kqBkcKr5CSJ0fDOOolLuankz4PSiHm g+oRPe6gRdVqcAEnDUy6PIBRaTLR1LZZEGpxq4/ei7DQd0f9nkuuUli4Irvpx6e132Ev KKUCcTypG0YxXTabLVsyduvK5KJXFsR2GNAFoPL+SZGzbV9iiCoUhTMcAOa0EfqUFfJT LfhJ8/iUXz/Nfy9Wl7PPWVm2+2qUjp++JKg7RGAM5d8BbrjLDB9TujIrQQZgqMVHr1gt 0Mig== 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; bh=pwDOHGKYvCi61mHFneVF0EduuTKfnrQsk03HbkNHX20=; b=NJcW+Spu1ylrjMuzj+ftpAMvJxTVJ6z6PAhHpzyd2tVxoO1uFOj+n1pfL3dp2V62cs Ea64Bn7+qy7xwk3AvF9n4w9XAlsF+i1i8pzmOltJ63o5prM6Ig7d9/hWtGTI5WD7D1MG hdcgNv7i9mshGzJ5Ftx18oik/PH7e/QXEfn8KEr8Q3g8HWLt+eCxeTbMk+MdFQh+oXk8 7wvu1Xu8KqBdamlRdcduIZFQjc4VNPekbRHyo5y031WzoliDMKNTse5lNjS3VgLPf4kx E1bbmggDNCXYqi/Doj5gRUXojICcwIyJEHO3uIhKjmZHwXj2NFswyFUqS6W9229I2COr VkGQ== X-Gm-Message-State: AOAM531CTvs3WV3fc6zjPQTb5mvEeVBR0uD+YuIWWnlgNc2hrA+JkrkF mh0V2O6CWrYpJkVYHgrhjCTTYA== X-Google-Smtp-Source: ABdhPJxnGWB4G0BauuF1CXzPhUUlFpGdCXVBwviMTN5qRwfvr9KZRSe4Mu5Ey8K87w5P6jwDUx+ihA== X-Received: by 2002:a17:90b:1254:: with SMTP id gx20mr1133241pjb.117.1597386302081; Thu, 13 Aug 2020 23:25:02 -0700 (PDT) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id z4sm7651496pfb.55.2020.08.13.23.25.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Aug 2020 23:25:01 -0700 (PDT) From: John Stultz To: lkml Cc: John Stultz , Sumit Semwal , "Andrew F . Davis" , Benjamin Gaignard , Liam Mark , Laura Abbott , Brian Starkey , Hridya Valsaraju , Robin Murphy , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH v2 1/2] dma-heap: Keep track of the heap device struct Date: Fri, 14 Aug 2020 06:24:57 +0000 Message-Id: <20200814062458.53049-1-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 Sender: linux-media-owner@vger.kernel.org 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: Sumit Semwal Cc: Andrew F. Davis Cc: Benjamin Gaignard Cc: Liam Mark Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Robin Murphy 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