From patchwork Fri Mar 29 02:40:01 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 2360901 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) by patchwork1.kernel.org (Postfix) with ESMTP id 207133FD40 for ; Fri, 29 Mar 2013 02:48:21 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [IPv6:::1]) by mail.linuxfoundation.org (Postfix) with ESMTP id E8461BA4; Fri, 29 Mar 2013 02:45:54 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTP id A4E4195B for ; Fri, 29 Mar 2013 02:45:49 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from kirsty.vergenet.net (kirsty.vergenet.net [202.4.237.240]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 70A6C2017E for ; Fri, 29 Mar 2013 02:45:44 +0000 (UTC) Received: from ayumi.akashicho.tokyo.vergenet.net (p8120-ipbfp1001kobeminato.hyogo.ocn.ne.jp [118.10.137.120]) by kirsty.vergenet.net (Postfix) with ESMTP id 581602C69D1; Fri, 29 Mar 2013 13:45:34 +1100 (EST) Received: by ayumi.akashicho.tokyo.vergenet.net (Postfix, from userid 7100) id C8876EDEA28; Fri, 29 Mar 2013 11:45:32 +0900 (JST) From: Simon Horman To: ltsi-dev@lists.linuxfoundation.org Date: Fri, 29 Mar 2013 11:40:01 +0900 Message-Id: <1364525119-31791-73-git-send-email-horms+renesas@verge.net.au> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1364525119-31791-1-git-send-email-horms+renesas@verge.net.au> References: <1364525119-31791-1-git-send-email-horms+renesas@verge.net.au> X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, RP_MATCHES_RCVD autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: Magnus Damm Subject: [LTSI-dev] [PATCH/RFC 072/390] DRM: Add DRM GEM CMA helper X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org From: Sascha Hauer Many embedded drm devices do not have a IOMMU and no dedicated memory for graphics. These devices use CMA (Contiguous Memory Allocator) backed graphics memory. This patch provides helper functions to be able to share the code. The code technically does not depend on CMA as the backend allocator, the name has been chosen because CMA makes for a nice, short but still descriptive function prefix. Signed-off-by: Sascha Hauer Tested-by: Lars-Peter Clausen [Make DRM_GEM_CMA_HELPER a boolean Kconfig option] Signed-off-by: Laurent Pinchart (cherry picked from commit b9d474500546160dd6af35f60cd8bc20edd13807) Signed-off-by: Simon Horman --- drivers/gpu/drm/Kconfig | 6 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_gem_cma_helper.c | 251 ++++++++++++++++++++++++++++++++++ include/drm/drm_gem_cma_helper.h | 44 ++++++ 4 files changed, 302 insertions(+) create mode 100644 drivers/gpu/drm/drm_gem_cma_helper.c create mode 100644 include/drm/drm_gem_cma_helper.h diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index e354bc0..35ea163 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -53,6 +53,12 @@ config DRM_TTM GPU memory types. Will be enabled automatically if a device driver uses it. +config DRM_GEM_CMA_HELPER + bool + depends on DRM + help + Choose this if you need the GEM CMA helper functions + config DRM_TDFX tristate "3dfx Banshee/Voodoo3+" depends on DRM && PCI diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index c20da5b..9a0d98a 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -15,6 +15,7 @@ drm-y := drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \ drm_trace_points.o drm_global.o drm_prime.o drm-$(CONFIG_COMPAT) += drm_ioc32.o +drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o drm-usb-y := drm_usb.o diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c new file mode 100644 index 0000000..1aa8fee --- /dev/null +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -0,0 +1,251 @@ +/* + * drm gem CMA (contiguous memory allocator) helper functions + * + * Copyright (C) 2012 Sascha Hauer, Pengutronix + * + * Based on Samsung Exynos code + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj) +{ + return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT; +} + +static void drm_gem_cma_buf_destroy(struct drm_device *drm, + struct drm_gem_cma_object *cma_obj) +{ + dma_free_writecombine(drm->dev, cma_obj->base.size, cma_obj->vaddr, + cma_obj->paddr); +} + +/* + * drm_gem_cma_create - allocate an object with the given size + * + * returns a struct drm_gem_cma_object* on success or ERR_PTR values + * on failure. + */ +struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, + unsigned int size) +{ + struct drm_gem_cma_object *cma_obj; + struct drm_gem_object *gem_obj; + int ret; + + size = round_up(size, PAGE_SIZE); + + cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); + if (!cma_obj) + return ERR_PTR(-ENOMEM); + + cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size, + &cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN); + if (!cma_obj->vaddr) { + dev_err(drm->dev, "failed to allocate buffer with size %d\n", size); + ret = -ENOMEM; + goto err_dma_alloc; + } + + gem_obj = &cma_obj->base; + + ret = drm_gem_object_init(drm, gem_obj, size); + if (ret) + goto err_obj_init; + + ret = drm_gem_create_mmap_offset(gem_obj); + if (ret) + goto err_create_mmap_offset; + + return cma_obj; + +err_create_mmap_offset: + drm_gem_object_release(gem_obj); + +err_obj_init: + drm_gem_cma_buf_destroy(drm, cma_obj); + +err_dma_alloc: + kfree(cma_obj); + + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_create); + +/* + * drm_gem_cma_create_with_handle - allocate an object with the given + * size and create a gem handle on it + * + * returns a struct drm_gem_cma_object* on success or ERR_PTR values + * on failure. + */ +static struct drm_gem_cma_object *drm_gem_cma_create_with_handle( + struct drm_file *file_priv, + struct drm_device *drm, unsigned int size, + unsigned int *handle) +{ + struct drm_gem_cma_object *cma_obj; + struct drm_gem_object *gem_obj; + int ret; + + cma_obj = drm_gem_cma_create(drm, size); + if (IS_ERR(cma_obj)) + return cma_obj; + + gem_obj = &cma_obj->base; + + /* + * allocate a id of idr table where the obj is registered + * and handle has the id what user can see. + */ + ret = drm_gem_handle_create(file_priv, gem_obj, handle); + if (ret) + goto err_handle_create; + + /* drop reference from allocate - handle holds it now. */ + drm_gem_object_unreference_unlocked(gem_obj); + + return cma_obj; + +err_handle_create: + drm_gem_cma_free_object(gem_obj); + + return ERR_PTR(ret); +} + +/* + * drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback + * function + */ +void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) +{ + struct drm_gem_cma_object *cma_obj; + + if (gem_obj->map_list.map) + drm_gem_free_mmap_offset(gem_obj); + + drm_gem_object_release(gem_obj); + + cma_obj = to_drm_gem_cma_obj(gem_obj); + + drm_gem_cma_buf_destroy(gem_obj->dev, cma_obj); + + kfree(cma_obj); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_free_object); + +/* + * drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback + * function + * + * This aligns the pitch and size arguments to the minimum required. wrap + * this into your own function if you need bigger alignment. + */ +int drm_gem_cma_dumb_create(struct drm_file *file_priv, + struct drm_device *dev, struct drm_mode_create_dumb *args) +{ + struct drm_gem_cma_object *cma_obj; + int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); + + if (args->pitch < min_pitch) + args->pitch = min_pitch; + + if (args->size < args->pitch * args->height) + args->size = args->pitch * args->height; + + cma_obj = drm_gem_cma_create_with_handle(file_priv, dev, + args->size, &args->handle); + if (IS_ERR(cma_obj)) + return PTR_ERR(cma_obj); + + return 0; +} +EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create); + +/* + * drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback + * function + */ +int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, + struct drm_device *drm, uint32_t handle, uint64_t *offset) +{ + struct drm_gem_object *gem_obj; + + mutex_lock(&drm->struct_mutex); + + gem_obj = drm_gem_object_lookup(drm, file_priv, handle); + if (!gem_obj) { + dev_err(drm->dev, "failed to lookup gem object\n"); + mutex_unlock(&drm->struct_mutex); + return -EINVAL; + } + + *offset = get_gem_mmap_offset(gem_obj); + + drm_gem_object_unreference(gem_obj); + + mutex_unlock(&drm->struct_mutex); + + return 0; +} +EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset); + +const struct vm_operations_struct drm_gem_cma_vm_ops = { + .open = drm_gem_vm_open, + .close = drm_gem_vm_close, +}; +EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops); + +/* + * drm_gem_cma_mmap - (struct file_operation)->mmap callback function + */ +int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct drm_gem_object *gem_obj; + struct drm_gem_cma_object *cma_obj; + int ret; + + ret = drm_gem_mmap(filp, vma); + if (ret) + return ret; + + gem_obj = vma->vm_private_data; + cma_obj = to_drm_gem_cma_obj(gem_obj); + + ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, vma->vm_page_prot); + if (ret) + drm_gem_vm_close(vma); + + return ret; +} +EXPORT_SYMBOL_GPL(drm_gem_cma_mmap); + +/* + * drm_gem_cma_dumb_destroy - (struct drm_driver)->dumb_destroy callback function + */ +int drm_gem_cma_dumb_destroy(struct drm_file *file_priv, + struct drm_device *drm, unsigned int handle) +{ + return drm_gem_handle_delete(file_priv, handle); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_destroy); diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h new file mode 100644 index 0000000..f0f6b1a --- /dev/null +++ b/include/drm/drm_gem_cma_helper.h @@ -0,0 +1,44 @@ +#ifndef __DRM_GEM_CMA_HELPER_H__ +#define __DRM_GEM_CMA_HELPER_H__ + +struct drm_gem_cma_object { + struct drm_gem_object base; + dma_addr_t paddr; + void *vaddr; +}; + +static inline struct drm_gem_cma_object * +to_drm_gem_cma_obj(struct drm_gem_object *gem_obj) +{ + return container_of(gem_obj, struct drm_gem_cma_object, base); +} + +/* free gem object. */ +void drm_gem_cma_free_object(struct drm_gem_object *gem_obj); + +/* create memory region for drm framebuffer. */ +int drm_gem_cma_dumb_create(struct drm_file *file_priv, + struct drm_device *drm, struct drm_mode_create_dumb *args); + +/* map memory region for drm framebuffer to user space. */ +int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, + struct drm_device *drm, uint32_t handle, uint64_t *offset); + +/* set vm_flags and we can change the vm attribute to other one at here. */ +int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma); + +/* + * destroy memory region allocated. + * - a gem handle and physical memory region pointed by a gem object + * would be released by drm_gem_handle_delete(). + */ +int drm_gem_cma_dumb_destroy(struct drm_file *file_priv, + struct drm_device *drm, unsigned int handle); + +/* allocate physical memory. */ +struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, + unsigned int size); + +extern const struct vm_operations_struct drm_gem_cma_vm_ops; + +#endif /* __DRM_GEM_CMA_HELPER_H__ */