From patchwork Wed Aug 10 13:09:07 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 1053672 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p7AD9W9k013240 for ; Wed, 10 Aug 2011 13:09:53 GMT Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DAE999ECE0 for ; Wed, 10 Aug 2011 06:09:31 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-gx0-f177.google.com (mail-gx0-f177.google.com [209.85.161.177]) by gabe.freedesktop.org (Postfix) with ESMTP id 7E2A49E8BE for ; Wed, 10 Aug 2011 06:09:22 -0700 (PDT) Received: by gxk2 with SMTP id 2so685718gxk.36 for ; Wed, 10 Aug 2011 06:09:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=sender:from:to:cc:subject:date:message-id:x-mailer; bh=m7IiJrWAz8nj+uUiQRQvuEe8OwA2FiMH24Ow0hz/5iM=; b=UcgqYXXzFSKNc3PvAuXVIwhTubFf4YhvuSjWs7WrhHgbfWp2zFzvVSSEw6bhFKFllS Qm5jRl5oQlBDHKhSo3J2ExgQmkSSTcQy8LJUHNnnZaTbB2gKuxqsqwuL76b0XBYuPXNm k4aeFJb5wbC32S8BQt17ljGi8zJn50+5YkhP8= Received: by 10.236.175.228 with SMTP id z64mr7125108yhl.3.1312981762038; Wed, 10 Aug 2011 06:09:22 -0700 (PDT) Received: from localhost (dragon.ti.com [192.94.94.33]) by mx.google.com with ESMTPS id f48sm1038516yhh.0.2011.08.10.06.09.18 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 10 Aug 2011 06:09:20 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [PATCH 1/3] drm/gem: add functions for mmap offset creation Date: Wed, 10 Aug 2011 08:09:07 -0500 Message-Id: <1312981749-16106-1-git-send-email-rob@ti.com> X-Mailer: git-send-email 1.7.5.4 Cc: Rob Clark , patches@linaro.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org Errors-To: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Wed, 10 Aug 2011 13:09:53 +0000 (UTC) Signed-off-by: Rob Clark --- drivers/gpu/drm/drm_gem.c | 88 +++++++++++++++++++++++++++++++++++++++++++++ include/drm/drmP.h | 3 ++ 2 files changed, 91 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 2b997d2..809358a 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -273,6 +273,94 @@ again: } EXPORT_SYMBOL(drm_gem_handle_create); + +/** + * drm_gem_free_mmap_offset - release a fake mmap offset for an object + * @obj: obj in question + * + * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). + */ +void +drm_gem_free_mmap_offset(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + struct drm_gem_mm *mm = dev->mm_private; + struct drm_map_list *list = &obj->map_list; + + drm_ht_remove_item(&mm->offset_hash, &list->hash); + drm_mm_put_block(list->file_offset_node); + kfree(list->map); + list->map = NULL; +} +EXPORT_SYMBOL(drm_gem_free_mmap_offset); + +/** + * drm_gem_create_mmap_offset - create a fake mmap offset for an object + * @obj: obj in question + * + * GEM memory mapping works by handing back to userspace a fake mmap offset + * it can use in a subsequent mmap(2) call. The DRM core code then looks + * up the object based on the offset and sets up the various memory mapping + * structures. + * + * This routine allocates and attaches a fake offset for @obj. + */ +int +drm_gem_create_mmap_offset(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + struct drm_gem_mm *mm = dev->mm_private; + struct drm_map_list *list; + struct drm_local_map *map; + int ret = 0; + + /* Set the object up for mmap'ing */ + list = &obj->map_list; + list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL); + if (!list->map) + return -ENOMEM; + + map = list->map; + map->type = _DRM_GEM; + map->size = obj->size; + map->handle = obj; + + /* Get a DRM GEM mmap offset allocated... */ + list->file_offset_node = drm_mm_search_free(&mm->offset_manager, + obj->size / PAGE_SIZE, 0, 0); + + if (!list->file_offset_node) { + DRM_ERROR("failed to allocate offset for bo %d\n", obj->name); + ret = -ENOSPC; + goto out_free_list; + } + + list->file_offset_node = drm_mm_get_block(list->file_offset_node, + obj->size / PAGE_SIZE, 0); + if (!list->file_offset_node) { + ret = -ENOMEM; + goto out_free_list; + } + + list->hash.key = list->file_offset_node->start; + ret = drm_ht_insert_item(&mm->offset_hash, &list->hash); + if (ret) { + DRM_ERROR("failed to add to map hash\n"); + goto out_free_mm; + } + + return 0; + +out_free_mm: + drm_mm_put_block(list->file_offset_node); +out_free_list: + kfree(list->map); + list->map = NULL; + + return ret; +} +EXPORT_SYMBOL(drm_gem_create_mmap_offset); + /** Returns a reference to the object named by the handle. */ struct drm_gem_object * drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 111e98f..ec156c3 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1622,6 +1622,9 @@ drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj) drm_gem_object_unreference_unlocked(obj); } +void drm_gem_free_mmap_offset(struct drm_gem_object *obj); +int drm_gem_create_mmap_offset(struct drm_gem_object *obj); + struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, u32 handle);