From patchwork Sat Aug 11 14:41:09 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 1308811 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by patchwork1.kernel.org (Postfix) with ESMTP id 150843FC33 for ; Sat, 11 Aug 2012 14:58:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E353D9FD67 for ; Sat, 11 Aug 2012 07:58:02 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (smtp.fireflyinternet.com [109.228.6.236]) by gabe.freedesktop.org (Postfix) with ESMTP id 090D19F73D for ; Sat, 11 Aug 2012 07:42:31 -0700 (PDT) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.73.22; Received: from arrandale.alporthouse.com (unverified [78.156.73.22]) by fireflyinternet.com (Firefly Internet SMTP) with ESMTP id 120056224-1500050 for multiple; Sat, 11 Aug 2012 15:42:01 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Sat, 11 Aug 2012 15:41:09 +0100 Message-Id: <1344696088-24760-11-git-send-email-chris@chris-wilson.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1344696088-24760-1-git-send-email-chris@chris-wilson.co.uk> References: <1344696088-24760-1-git-send-email-chris@chris-wilson.co.uk> X-Originating-IP: 78.156.73.22 Subject: [Intel-gfx] [PATCH 10/29] drm/i915: Pin backing pages for pwrite X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org By using the recently introduced pinning of pages, we can safely drop the mutex in the knowledge that the pages are not going to disappear beneath us, and so we can simplify the code for iterating over the pages. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_gem.c | 37 +++++++++++++------------------------ 1 file changed, 13 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index c90e265..2e5cecc 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -690,7 +690,7 @@ shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length, page_length); kunmap_atomic(vaddr); - return ret; + return ret ? -EFAULT : 0; } /* Only difference to the fast-path function is that this can handle bit17 @@ -724,7 +724,7 @@ shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length, page_do_bit17_swizzling); kunmap(page); - return ret; + return ret ? -EFAULT : 0; } static int @@ -733,7 +733,6 @@ i915_gem_shmem_pwrite(struct drm_device *dev, struct drm_i915_gem_pwrite *args, struct drm_file *file) { - struct address_space *mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping; ssize_t remain; loff_t offset; char __user *user_data; @@ -742,7 +741,6 @@ i915_gem_shmem_pwrite(struct drm_device *dev, int hit_slowpath = 0; int needs_clflush_after = 0; int needs_clflush_before = 0; - int release_page; user_data = (char __user *) (uintptr_t) args->data_ptr; remain = args->size; @@ -768,6 +766,12 @@ i915_gem_shmem_pwrite(struct drm_device *dev, && obj->cache_level == I915_CACHE_NONE) needs_clflush_before = 1; + ret = i915_gem_object_get_pages(obj); + if (ret) + return ret; + + i915_gem_object_pin_pages(obj); + offset = args->offset; obj->dirty = 1; @@ -793,18 +797,7 @@ i915_gem_shmem_pwrite(struct drm_device *dev, ((shmem_page_offset | page_length) & (boot_cpu_data.x86_clflush_size - 1)); - if (obj->pages) { - page = obj->pages[offset >> PAGE_SHIFT]; - release_page = 0; - } else { - page = shmem_read_mapping_page(mapping, offset >> PAGE_SHIFT); - if (IS_ERR(page)) { - ret = PTR_ERR(page); - goto out; - } - release_page = 1; - } - + page = obj->pages[offset >> PAGE_SHIFT]; page_do_bit17_swizzling = obj_do_bit17_swizzling && (page_to_phys(page) & (1 << 17)) != 0; @@ -816,26 +809,20 @@ i915_gem_shmem_pwrite(struct drm_device *dev, goto next_page; hit_slowpath = 1; - page_cache_get(page); mutex_unlock(&dev->struct_mutex); - ret = shmem_pwrite_slow(page, shmem_page_offset, page_length, user_data, page_do_bit17_swizzling, partial_cacheline_write, needs_clflush_after); mutex_lock(&dev->struct_mutex); - page_cache_release(page); + next_page: set_page_dirty(page); mark_page_accessed(page); - if (release_page) - page_cache_release(page); - if (ret) { - ret = -EFAULT; + if (ret) goto out; - } remain -= page_length; user_data += page_length; @@ -843,6 +830,8 @@ next_page: } out: + i915_gem_object_unpin_pages(obj); + if (hit_slowpath) { /* Fixup: Kill any reinstated backing storage pages */ if (obj->madv == __I915_MADV_PURGED)