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: 28828 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from mail.tu-berlin.de ([130.149.7.33]) by www.linuxtv.org with esmtp (Exim 4.72) (envelope-from ) id 1YXq7e-0002XC-Dx; Tue, 17 Mar 2015 12:57:22 +0100 X-tubIT-Incoming-IP: 209.132.180.67 Received: from vger.kernel.org ([209.132.180.67]) by mail.tu-berlin.de (exim-4.76/mailfrontend-5) with esmtp id 1YXq7c-0002Hz-73; Tue, 17 Mar 2015 12:57:22 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932164AbbCQL5N (ORCPT + 1 other); Tue, 17 Mar 2015 07:57:13 -0400 Received: from cantor2.suse.de ([195.135.220.15]:43259 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754209AbbCQL5D (ORCPT ); Tue, 17 Mar 2015 07:57:03 -0400 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 Cc: Hans Verkuil , Mauro Carvalho Chehab , linux-mm@kvack.org, dri-devel@lists.freedesktop.org, David Airlie , Jan Kara 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> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-PMX-Version: 6.0.0.2142326, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.3.17.114528 X-PMX-Spam: Gauge=IIIIIIII, Probability=8%, Report=' MULTIPLE_RCPTS 0.1, HTML_00_01 0.05, HTML_00_10 0.05, REFERENCES 0, URI_ENDS_IN_HTML 0, __ANY_URI 0, __CP_URI_IN_BODY 0, __HAS_FROM 0, __HAS_MSGID 0, __HAS_X_MAILER 0, __HAS_X_MAILING_LIST 0, __IN_REP_TO 0, __MIME_TEXT_ONLY 0, __MULTIPLE_RCPTS_CC_X2 0, __REFERENCES 0, __SANE_MSGID 0, __TO_MALFORMED_2 0, __TO_NO_NAME 0, __URI_NO_WWW 0, __URI_NS ' 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)