From patchwork Fri Mar 29 18:40:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zengtao (B)" X-Patchwork-Id: 10878885 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DEDA914DE for ; Sun, 31 Mar 2019 22:25:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CA32928849 for ; Sun, 31 Mar 2019 22:25:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BE46628856; Sun, 31 Mar 2019 22:25:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.3 required=2.0 tests=BAYES_00,DATE_IN_FUTURE_06_12, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 49D7F28864 for ; Sun, 31 Mar 2019 22:25:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E2A8A6E629; Sun, 31 Mar 2019 22:25:53 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org X-Greylist: delayed 967 seconds by postgrey-1.36 at gabe; Fri, 29 Mar 2019 10:56:08 UTC Received: from huawei.com (szxga04-in.huawei.com [45.249.212.190]) by gabe.freedesktop.org (Postfix) with ESMTPS id 716F56E8B4 for ; Fri, 29 Mar 2019 10:56:08 +0000 (UTC) Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 5A82454DC83587D6ECD0; Fri, 29 Mar 2019 18:39:58 +0800 (CST) Received: from dessert.huawei.com (10.69.192.158) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.408.0; Fri, 29 Mar 2019 18:39:49 +0800 From: Zeng Tao To: , Subject: [PATCH] staging: android: ion: refactory ion_alloc for kernel driver use Date: Sat, 30 Mar 2019 02:40:16 +0800 Message-ID: <1553884816-37850-1-git-send-email-prime.zeng@hisilicon.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.69.192.158] X-CFilter-Loop: Reflected X-Mailman-Approved-At: Sun, 31 Mar 2019 22:25:53 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devel@driverdev.osuosl.org, Todd Kjos , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, =?utf-8?q?Arve_Hj=C3=B8nnev=C3=A5g?= , prime.zeng@hisilicon.com, Joel Fernandes , Martijn Coenen , Christian Brauner Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP There are two reasons for this patch: 1. There are some potential requirements for ion_alloc in kernel space, some media drivers need to allocate media buffers from ion instead of buddy or dma framework, this is more convient and clean very for media drivers. And In that case, ion is the only media buffer provider, it's more easier to maintain. 2. Fd is only needed by user processes, not the kernel space, so dma_buf should be returned instead of fd for kernel space, and dma_buf_fd should be called only for userspace api. Signed-off-by: Zeng Tao --- drivers/staging/android/ion/ion.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index 92c2914..e93fb49 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -387,13 +387,13 @@ static const struct dma_buf_ops dma_buf_ops = { .unmap = ion_dma_buf_kunmap, }; -static int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags) +struct dma_buf *ion_alloc(size_t len, unsigned int heap_id_mask, + unsigned int flags) { struct ion_device *dev = internal_dev; struct ion_buffer *buffer = NULL; struct ion_heap *heap; DEFINE_DMA_BUF_EXPORT_INFO(exp_info); - int fd; struct dma_buf *dmabuf; pr_debug("%s: len %zu heap_id_mask %u flags %x\n", __func__, @@ -407,7 +407,7 @@ static int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags) len = PAGE_ALIGN(len); if (!len) - return -EINVAL; + return ERR_PTR(-EINVAL); down_read(&dev->lock); plist_for_each_entry(heap, &dev->heaps, node) { @@ -421,10 +421,10 @@ static int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags) up_read(&dev->lock); if (!buffer) - return -ENODEV; + return ERR_PTR(-ENODEV); if (IS_ERR(buffer)) - return PTR_ERR(buffer); + return ERR_PTR(PTR_ERR(buffer)); exp_info.ops = &dma_buf_ops; exp_info.size = buffer->size; @@ -432,17 +432,12 @@ static int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags) exp_info.priv = buffer; dmabuf = dma_buf_export(&exp_info); - if (IS_ERR(dmabuf)) { + if (IS_ERR(dmabuf)) _ion_buffer_destroy(buffer); - return PTR_ERR(dmabuf); - } - fd = dma_buf_fd(dmabuf, O_CLOEXEC); - if (fd < 0) - dma_buf_put(dmabuf); - - return fd; + return dmabuf; } +EXPORT_SYMBOL(ion_alloc); static int ion_query_heaps(struct ion_heap_query *query) { @@ -539,12 +534,19 @@ static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) case ION_IOC_ALLOC: { int fd; + struct dma_buf *dmabuf; - fd = ion_alloc(data.allocation.len, + dmabuf = ion_alloc(data.allocation.len, data.allocation.heap_id_mask, data.allocation.flags); - if (fd < 0) + if (IS_ERR(dmabuf)) + return PTR_ERR(dmabuf); + + fd = dma_buf_fd(dmabuf, O_CLOEXEC); + if (fd < 0) { + dma_buf_put(dmabuf); return fd; + } data.allocation.fd = fd;