From patchwork Tue Mar 17 11:56:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 6031421 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A644F9FB2B for ; Tue, 17 Mar 2015 11:57:13 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7D8052045B for ; Tue, 17 Mar 2015 11:57:11 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 2CA6820461 for ; Tue, 17 Mar 2015 11:57:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 64DB46E693; Tue, 17 Mar 2015 04:57:05 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mx2.suse.de (cantor2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTP id DAC986E694 for ; Tue, 17 Mar 2015 04:57:01 -0700 (PDT) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 057A6AD32; Tue, 17 Mar 2015 11:57:01 +0000 (UTC) Received: by quack.suse.cz (Postfix, from userid 1000) id 686A981FA5; Tue, 17 Mar 2015 12:56:53 +0100 (CET) From: Jan Kara To: linux-media@vger.kernel.org Subject: [PATCH 9/9] drm/exynos: Convert g2d_userptr_get_dma_addr() to use get_vaddr_pfn() Date: Tue, 17 Mar 2015 12:56:39 +0100 Message-Id: <1426593399-6549-10-git-send-email-jack@suse.cz> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1426593399-6549-1-git-send-email-jack@suse.cz> References: <1426593399-6549-1-git-send-email-jack@suse.cz> Cc: Jan Kara , Mauro Carvalho Chehab , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Hans Verkuil X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Convert g2d_userptr_get_dma_addr() to pin pages using get_vaddr_pfn(). This removes the knowledge about vmas and mmap_sem locking from exynos driver. Also it fixes a problem that the function has been mapping user provided address without holding mmap_sem. Signed-off-by: Jan Kara --- drivers/gpu/drm/exynos/exynos_drm_g2d.c | 91 ++++++++++--------------------- drivers/gpu/drm/exynos/exynos_drm_gem.c | 97 --------------------------------- 2 files changed, 30 insertions(+), 158 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 81a250830808..8949354a85a1 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -190,10 +190,8 @@ struct g2d_cmdlist_userptr { dma_addr_t dma_addr; unsigned long userptr; unsigned long size; - struct page **pages; - unsigned int npages; + struct pinned_pfns *pfns; struct sg_table *sgt; - struct vm_area_struct *vma; atomic_t refcount; bool in_pool; bool out_of_list; @@ -363,6 +361,7 @@ static void g2d_userptr_put_dma_addr(struct drm_device *drm_dev, { struct g2d_cmdlist_userptr *g2d_userptr = (struct g2d_cmdlist_userptr *)obj; + struct page **pages; if (!obj) return; @@ -382,19 +381,21 @@ out: exynos_gem_unmap_sgt_from_dma(drm_dev, g2d_userptr->sgt, DMA_BIDIRECTIONAL); - exynos_gem_put_pages_to_userptr(g2d_userptr->pages, - g2d_userptr->npages, - g2d_userptr->vma); + pages = pfns_vector_pages(g2d_userptr->pfns); + if (pages) { + int i; - exynos_gem_put_vma(g2d_userptr->vma); + for (i = 0; i < pfns_vector_count(g2d_userptr->pfns); i++) + set_page_dirty_lock(pages[i]); + } + put_vaddr_pfns(g2d_userptr->pfns); + pfns_vector_destroy(g2d_userptr->pfns); if (!g2d_userptr->out_of_list) list_del_init(&g2d_userptr->list); sg_free_table(g2d_userptr->sgt); kfree(g2d_userptr->sgt); - - drm_free_large(g2d_userptr->pages); kfree(g2d_userptr); } @@ -413,6 +414,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev, struct vm_area_struct *vma; unsigned long start, end; unsigned int npages, offset; + struct pinned_pfns *pfns; int ret; if (!size) { @@ -456,65 +458,37 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev, return ERR_PTR(-ENOMEM); atomic_set(&g2d_userptr->refcount, 1); + g2d_userptr->size = size; start = userptr & PAGE_MASK; offset = userptr & ~PAGE_MASK; end = PAGE_ALIGN(userptr + size); npages = (end - start) >> PAGE_SHIFT; - g2d_userptr->npages = npages; + pfns = g2d_userptr->pfns = pfns_vector_create(npages); + if (!pfns) + goto out_free; - pages = drm_calloc_large(npages, sizeof(struct page *)); - if (!pages) { - DRM_ERROR("failed to allocate pages.\n"); - ret = -ENOMEM; - goto err_free; - } - - down_read(¤t->mm->mmap_sem); - vma = find_vma(current->mm, userptr); - if (!vma) { - up_read(¤t->mm->mmap_sem); - DRM_ERROR("failed to get vm region.\n"); + ret = get_vaddr_pfn(start, npages, 1, 1, pfns); + if (ret != npages) { + DRM_ERROR("failed to get user pages from userptr.\n"); + if (ret < 0) + goto err_destroy_pfns; ret = -EFAULT; - goto err_free_pages; + goto err_put_pfns; } - - if (vma->vm_end < userptr + size) { - up_read(¤t->mm->mmap_sem); - DRM_ERROR("vma is too small.\n"); + if (pfns_vector_to_pages(pfns) < 0) { ret = -EFAULT; - goto err_free_pages; + goto err_put_pfns; } - g2d_userptr->vma = exynos_gem_get_vma(vma); - if (!g2d_userptr->vma) { - up_read(¤t->mm->mmap_sem); - DRM_ERROR("failed to copy vma.\n"); - ret = -ENOMEM; - goto err_free_pages; - } - - g2d_userptr->size = size; - - ret = exynos_gem_get_pages_from_userptr(start & PAGE_MASK, - npages, pages, vma); - if (ret < 0) { - up_read(¤t->mm->mmap_sem); - DRM_ERROR("failed to get user pages from userptr.\n"); - goto err_put_vma; - } - - up_read(¤t->mm->mmap_sem); - g2d_userptr->pages = pages; - sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); if (!sgt) { ret = -ENOMEM; - goto err_free_userptr; + goto err_put_pfns; } - ret = sg_alloc_table_from_pages(sgt, pages, npages, offset, - size, GFP_KERNEL); + ret = sg_alloc_table_from_pages(sgt, pfns_vector_pages(pfns), npages, + offset, size, GFP_KERNEL); if (ret < 0) { DRM_ERROR("failed to get sgt from pages.\n"); goto err_free_sgt; @@ -549,16 +523,11 @@ err_sg_free_table: err_free_sgt: kfree(sgt); -err_free_userptr: - exynos_gem_put_pages_to_userptr(g2d_userptr->pages, - g2d_userptr->npages, - g2d_userptr->vma); - -err_put_vma: - exynos_gem_put_vma(g2d_userptr->vma); +err_put_pfns: + put_vaddr_pfns(pfns); -err_free_pages: - drm_free_large(pages); +err_destroy_pfns: + pfns_vector_destroy(pfns); err_free: kfree(g2d_userptr); diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index 0d5b9698d384..47068ae44ced 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -378,103 +378,6 @@ int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, return 0; } -struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) -{ - struct vm_area_struct *vma_copy; - - vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); - if (!vma_copy) - return NULL; - - if (vma->vm_ops && vma->vm_ops->open) - vma->vm_ops->open(vma); - - if (vma->vm_file) - get_file(vma->vm_file); - - memcpy(vma_copy, vma, sizeof(*vma)); - - vma_copy->vm_mm = NULL; - vma_copy->vm_next = NULL; - vma_copy->vm_prev = NULL; - - return vma_copy; -} - -void exynos_gem_put_vma(struct vm_area_struct *vma) -{ - if (!vma) - return; - - if (vma->vm_ops && vma->vm_ops->close) - vma->vm_ops->close(vma); - - if (vma->vm_file) - fput(vma->vm_file); - - kfree(vma); -} - -int exynos_gem_get_pages_from_userptr(unsigned long start, - unsigned int npages, - struct page **pages, - struct vm_area_struct *vma) -{ - int get_npages; - - /* the memory region mmaped with VM_PFNMAP. */ - if (vma_is_io(vma)) { - unsigned int i; - - for (i = 0; i < npages; ++i, start += PAGE_SIZE) { - unsigned long pfn; - int ret = follow_pfn(vma, start, &pfn); - if (ret) - return ret; - - pages[i] = pfn_to_page(pfn); - } - - if (i != npages) { - DRM_ERROR("failed to get user_pages.\n"); - return -EINVAL; - } - - return 0; - } - - get_npages = get_user_pages(current, current->mm, start, - npages, 1, 1, pages, NULL); - get_npages = max(get_npages, 0); - if (get_npages != npages) { - DRM_ERROR("failed to get user_pages.\n"); - while (get_npages) - put_page(pages[--get_npages]); - return -EFAULT; - } - - return 0; -} - -void exynos_gem_put_pages_to_userptr(struct page **pages, - unsigned int npages, - struct vm_area_struct *vma) -{ - if (!vma_is_io(vma)) { - unsigned int i; - - for (i = 0; i < npages; i++) { - set_page_dirty_lock(pages[i]); - - /* - * undo the reference we took when populating - * the table. - */ - put_page(pages[i]); - } - } -} - int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, struct sg_table *sgt, enum dma_data_direction dir)