From patchwork Mon Apr 3 18:57:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laura Abbott X-Patchwork-Id: 9660389 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DA6AE6032D for ; Mon, 3 Apr 2017 19:03:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CE3C9284C2 for ; Mon, 3 Apr 2017 19:03:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C2B23284F0; Mon, 3 Apr 2017 19:03:36 +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=-6.4 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3BC03284C2 for ; Mon, 3 Apr 2017 19:03:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752921AbdDCTDe (ORCPT ); Mon, 3 Apr 2017 15:03:34 -0400 Received: from mail-qt0-f180.google.com ([209.85.216.180]:33325 "EHLO mail-qt0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752412AbdDCS6g (ORCPT ); Mon, 3 Apr 2017 14:58:36 -0400 Received: by mail-qt0-f180.google.com with SMTP id i34so120893415qtc.0 for ; Mon, 03 Apr 2017 11:58:35 -0700 (PDT) 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; bh=4Ye4jXgrBlFWFqyVratgoSkg1OnG0WOcyXYhsgrLTa8=; b=KOM4HIwl14hjF+aVVcjUIIkz7KV8OkZb/167iJ9nqRKLen4eFVA4XjLb5oEiXnHZ5M LqGWsWcH8ILfPdFOvKdNkmeSVsJbVZd9zXUi9AQxPYV4zGKdKRCWuoRKprE+A32za0Ci dj0YsqVC9LJp3xHIoul7xU/B2kTAAm2YbAwys6FoKxP4N+MkiEaGBa191P8LqEA7JslN Xxo4RcK58QoEuiaX7RxXZt8Nl7480Zb5xOZf/kIpdlCift6XOdgBdIPn+JrDN8JzWYVe UBv4mVuV5UbLj0HQ/932NxT4PzXoKQEpPTcxGGOZAcdjr/kC7QZnD/wT3xq0DNqyeEs2 GpZw== X-Gm-Message-State: AFeK/H09Unvl3BpUa7yL7T3Fq3vGRrAyWdFJA6SCyXpKXehKpuzX2nA38Jmghb3lOUymcnzx X-Received: by 10.200.57.1 with SMTP id s1mr18127615qtb.236.1491245909800; Mon, 03 Apr 2017 11:58:29 -0700 (PDT) Received: from labbott-redhat-machine.redhat.com ([2601:602:9802:a8dc:1722:8a6b:a66c:79eb]) by smtp.gmail.com with ESMTPSA id e5sm10173689qtc.6.2017.04.03.11.58.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Apr 2017 11:58:28 -0700 (PDT) From: Laura Abbott To: Sumit Semwal , Riley Andrews , arve@android.com Cc: Laura Abbott , romlem@google.com, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Greg Kroah-Hartman , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, Brian Starkey , Daniel Vetter , Mark Brown , Benjamin Gaignard , linux-mm@kvack.org, Laurent Pinchart Subject: [PATCHv3 06/22] staging: android: ion: Call dma_map_sg for syncing and mapping Date: Mon, 3 Apr 2017 11:57:48 -0700 Message-Id: <1491245884-15852-7-git-send-email-labbott@redhat.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1491245884-15852-1-git-send-email-labbott@redhat.com> References: <1491245884-15852-1-git-send-email-labbott@redhat.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Technically, calling dma_buf_map_attachment should return a buffer properly dma_mapped. Add calls to dma_map_sg to begin_cpu_access to ensure this happens. As a side effect, this lets Ion buffers take advantage of the dma_buf sync ioctls. Signed-off-by: Laura Abbott --- drivers/staging/android/ion/ion.c | 151 ++++++++++++++++++++++----------- drivers/staging/android/ion/ion_priv.h | 1 + 2 files changed, 103 insertions(+), 49 deletions(-) diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index 7dcb8a9..6aac935 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -162,6 +162,7 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap, buffer->dev = dev; buffer->size = len; INIT_LIST_HEAD(&buffer->vmas); + INIT_LIST_HEAD(&buffer->attachments); mutex_init(&buffer->lock); /* * this will set up dma addresses for the sglist -- it is not @@ -796,10 +797,6 @@ void ion_client_destroy(struct ion_client *client) } EXPORT_SYMBOL(ion_client_destroy); -static void ion_buffer_sync_for_device(struct ion_buffer *buffer, - struct device *dev, - enum dma_data_direction direction); - static struct sg_table *dup_sg_table(struct sg_table *table) { struct sg_table *new_table; @@ -826,22 +823,89 @@ static struct sg_table *dup_sg_table(struct sg_table *table) return new_table; } +static void free_duped_table(struct sg_table *table) +{ + sg_free_table(table); + kfree(table); +} + +struct ion_dma_buf_attachment { + struct device *dev; + struct sg_table *table; + struct list_head list; +}; + +static int ion_dma_buf_attach(struct dma_buf *dmabuf, struct device *dev, + struct dma_buf_attachment *attachment) +{ + struct ion_dma_buf_attachment *a; + struct sg_table *table; + struct ion_buffer *buffer = dmabuf->priv; + + a = kzalloc(sizeof(*a), GFP_KERNEL); + if (!a) + return -ENOMEM; + + table = dup_sg_table(buffer->sg_table); + if (IS_ERR(table)) { + kfree(a); + return -ENOMEM; + } + + a->table = table; + a->dev = dev; + INIT_LIST_HEAD(&a->list); + + attachment->priv = a; + + mutex_lock(&buffer->lock); + list_add(&a->list, &buffer->attachments); + mutex_unlock(&buffer->lock); + + return 0; +} + +static void ion_dma_buf_detatch(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct ion_dma_buf_attachment *a = attachment->priv; + struct ion_buffer *buffer = dmabuf->priv; + + free_duped_table(a->table); + mutex_lock(&buffer->lock); + list_del(&a->list); + mutex_unlock(&buffer->lock); + + kfree(a); +} + + static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment, enum dma_data_direction direction) { - struct dma_buf *dmabuf = attachment->dmabuf; - struct ion_buffer *buffer = dmabuf->priv; + struct ion_dma_buf_attachment *a = attachment->priv; + struct sg_table *table; + int ret; + + table = a->table; - ion_buffer_sync_for_device(buffer, attachment->dev, direction); - return dup_sg_table(buffer->sg_table); + if (!dma_map_sg(attachment->dev, table->sgl, table->nents, + direction)){ + ret = -ENOMEM; + goto err; + } + return table; + +err: + free_duped_table(table); + return ERR_PTR(ret); } static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *table, enum dma_data_direction direction) { - sg_free_table(table); - kfree(table); + dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction); } void ion_pages_sync_for_device(struct device *dev, struct page *page, @@ -865,38 +929,6 @@ struct ion_vma_list { struct vm_area_struct *vma; }; -static void ion_buffer_sync_for_device(struct ion_buffer *buffer, - struct device *dev, - enum dma_data_direction dir) -{ - struct ion_vma_list *vma_list; - int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE; - int i; - - pr_debug("%s: syncing for device %s\n", __func__, - dev ? dev_name(dev) : "null"); - - if (!ion_buffer_fault_user_mappings(buffer)) - return; - - mutex_lock(&buffer->lock); - for (i = 0; i < pages; i++) { - struct page *page = buffer->pages[i]; - - if (ion_buffer_page_is_dirty(page)) - ion_pages_sync_for_device(dev, ion_buffer_page(page), - PAGE_SIZE, dir); - - ion_buffer_page_clean(buffer->pages + i); - } - list_for_each_entry(vma_list, &buffer->vmas, list) { - struct vm_area_struct *vma = vma_list->vma; - - zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start); - } - mutex_unlock(&buffer->lock); -} - static int ion_vm_fault(struct vm_fault *vmf) { struct ion_buffer *buffer = vmf->vma->vm_private_data; @@ -1014,26 +1046,45 @@ static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, { struct ion_buffer *buffer = dmabuf->priv; void *vaddr; + struct ion_dma_buf_attachment *a; - if (!buffer->heap->ops->map_kernel) { - pr_err("%s: map kernel is not implemented by this heap.\n", - __func__); - return -ENODEV; + /* + * TODO: Move this elsewhere because we don't always need a vaddr + */ + if (buffer->heap->ops->map_kernel) { + mutex_lock(&buffer->lock); + vaddr = ion_buffer_kmap_get(buffer); + mutex_unlock(&buffer->lock); } + mutex_lock(&buffer->lock); - vaddr = ion_buffer_kmap_get(buffer); + list_for_each_entry(a, &buffer->attachments, list) { + dma_sync_sg_for_cpu(a->dev, a->table->sgl, a->table->nents, + DMA_BIDIRECTIONAL); + } mutex_unlock(&buffer->lock); - return PTR_ERR_OR_ZERO(vaddr); + + return 0; } static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, enum dma_data_direction direction) { struct ion_buffer *buffer = dmabuf->priv; + struct ion_dma_buf_attachment *a; + + if (buffer->heap->ops->map_kernel) { + mutex_lock(&buffer->lock); + ion_buffer_kmap_put(buffer); + mutex_unlock(&buffer->lock); + } mutex_lock(&buffer->lock); - ion_buffer_kmap_put(buffer); + list_for_each_entry(a, &buffer->attachments, list) { + dma_sync_sg_for_device(a->dev, a->table->sgl, a->table->nents, + DMA_BIDIRECTIONAL); + } mutex_unlock(&buffer->lock); return 0; @@ -1044,6 +1095,8 @@ static const struct dma_buf_ops dma_buf_ops = { .unmap_dma_buf = ion_unmap_dma_buf, .mmap = ion_mmap, .release = ion_dma_buf_release, + .attach = ion_dma_buf_attach, + .detach = ion_dma_buf_detatch, .begin_cpu_access = ion_dma_buf_begin_cpu_access, .end_cpu_access = ion_dma_buf_end_cpu_access, .kmap_atomic = ion_dma_buf_kmap, diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h index b09bc7c..297d99d 100644 --- a/drivers/staging/android/ion/ion_priv.h +++ b/drivers/staging/android/ion/ion_priv.h @@ -72,6 +72,7 @@ struct ion_buffer { struct sg_table *sg_table; struct page **pages; struct list_head vmas; + struct list_head attachments; /* used to track orphaned buffers */ int handle_count; char task_comm[TASK_COMM_LEN];