From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8ACBFC04AAF for ; Thu, 16 May 2019 14:15:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6228D21743 for ; Thu, 16 May 2019 14:15:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727821AbfEPOPI (ORCPT ); Thu, 16 May 2019 10:15:08 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:47212 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727786AbfEPOPF (ORCPT ); Thu, 16 May 2019 10:15:05 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E46871AED; Thu, 16 May 2019 07:15:04 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EF8893F71E; Thu, 16 May 2019 07:15:01 -0700 (PDT) From: Steven Price To: Daniel Vetter , Rob Herring , Tomeu Vizoso Cc: Steven Price , Alyssa Rosenzweig , Chris Wilson , David Airlie , Inki Dae , Joonyoung Shim , Krzysztof Kozlowski , Kukjin Kim , Kyungmin Park , Maarten Lankhorst , Maxime Ripard , Sean Paul , Seung-Woo Kim , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/3] drm: shmem: Add drm_gem_shmem_map_offset() wrapper Date: Thu, 16 May 2019 15:14:46 +0100 Message-Id: <20190516141447.46839-3-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190516141447.46839-1-steven.price@arm.com> References: <20190516141447.46839-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide a wrapper for drm_gem_map_offset() for clients of shmem. This wrapper provides the correct semantics for the drm_gem_shmem_mmap() callback. Signed-off-by: Steven Price --- drivers/gpu/drm/drm_gem_shmem_helper.c | 20 ++++++++++++++++++++ include/drm/drm_gem_shmem_helper.h | 2 ++ 2 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 1ee208c2c85e..9dbebc4897d1 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -400,6 +400,26 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, } EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create); +/** + * drm_gem_map_offset - return the fake mmap offset for a gem object + * @file: drm file-private structure containing the gem object + * @dev: corresponding drm_device + * @handle: gem object handle + * @offset: return location for the fake mmap offset + * + * This provides an offset suitable for user space to return to the + * drm_gem_shmem_mmap() callback via an mmap() call. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_shmem_map_offset(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset) +{ + return drm_gem_map_offset(file, dev, handle, offset); +} +EXPORT_SYMBOL_GPL(drm_gem_shmem_map_offset); + static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 038b6d313447..4239ddaaaa4f 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -128,6 +128,8 @@ drm_gem_shmem_create_with_handle(struct drm_file *file_priv, int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args); +int drm_gem_shmem_map_offset(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset); int drm_gem_shmem_mmap(struct file *filp, struct vm_area_struct *vma); extern const struct vm_operations_struct drm_gem_shmem_vm_ops; -- 2.20.1