2012-06-27 21:30:18 +08:00
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/*
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* drm gem CMA (contiguous memory allocator) helper functions
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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*
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* Based on Samsung Exynos code
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/export.h>
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2013-02-17 08:57:30 +08:00
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#include <linux/dma-buf.h>
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2012-06-27 21:30:18 +08:00
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#include <linux/dma-mapping.h>
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#include <drm/drmP.h>
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#include <drm/drm.h>
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#include <drm/drm_gem_cma_helper.h>
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2013-07-25 03:07:52 +08:00
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#include <drm/drm_vma_manager.h>
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2012-06-27 21:30:18 +08:00
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/*
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2013-02-17 08:54:26 +08:00
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* __drm_gem_cma_create - Create a GEM CMA object without allocating memory
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* @drm: The drm device
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* @size: The GEM object size
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2012-06-27 21:30:18 +08:00
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*
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2013-02-17 08:54:26 +08:00
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* This function creates and initializes a GEM CMA object of the given size, but
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* doesn't allocate any memory to back the object.
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*
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* Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure.
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2012-06-27 21:30:18 +08:00
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*/
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2013-02-17 08:54:26 +08:00
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static struct drm_gem_cma_object *
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__drm_gem_cma_create(struct drm_device *drm, unsigned int size)
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2012-06-27 21:30:18 +08:00
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
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if (!cma_obj)
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return ERR_PTR(-ENOMEM);
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gem_obj = &cma_obj->base;
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ret = drm_gem_object_init(drm, gem_obj, size);
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if (ret)
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2013-02-17 08:54:26 +08:00
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goto error;
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2012-06-27 21:30:18 +08:00
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ret = drm_gem_create_mmap_offset(gem_obj);
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2013-02-17 08:54:26 +08:00
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if (ret) {
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drm_gem_object_release(gem_obj);
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goto error;
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}
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2012-06-27 21:30:18 +08:00
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return cma_obj;
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2013-02-17 08:54:26 +08:00
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error:
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kfree(cma_obj);
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return ERR_PTR(ret);
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}
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2012-06-27 21:30:18 +08:00
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2013-02-17 08:54:26 +08:00
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/*
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* drm_gem_cma_create - allocate an object with the given size
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*
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* returns a struct drm_gem_cma_object* on success or ERR_PTR values
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* on failure.
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*/
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struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
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unsigned int size)
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{
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struct drm_gem_cma_object *cma_obj;
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2013-02-17 08:57:30 +08:00
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int ret;
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2012-06-27 21:30:18 +08:00
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2013-02-17 08:54:26 +08:00
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size = round_up(size, PAGE_SIZE);
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2012-06-27 21:30:18 +08:00
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2013-02-17 08:54:26 +08:00
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cma_obj = __drm_gem_cma_create(drm, size);
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if (IS_ERR(cma_obj))
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return cma_obj;
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cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
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&cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN);
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if (!cma_obj->vaddr) {
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dev_err(drm->dev, "failed to allocate buffer with size %d\n",
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size);
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2013-02-17 08:57:30 +08:00
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ret = -ENOMEM;
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goto error;
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}
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2013-02-17 08:54:26 +08:00
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return cma_obj;
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2013-02-17 08:57:30 +08:00
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error:
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drm_gem_cma_free_object(&cma_obj->base);
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return ERR_PTR(ret);
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2012-06-27 21:30:18 +08:00
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_create);
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/*
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* drm_gem_cma_create_with_handle - allocate an object with the given
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* size and create a gem handle on it
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*
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* returns a struct drm_gem_cma_object* on success or ERR_PTR values
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* on failure.
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*/
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static struct drm_gem_cma_object *drm_gem_cma_create_with_handle(
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struct drm_file *file_priv,
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struct drm_device *drm, unsigned int size,
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unsigned int *handle)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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cma_obj = drm_gem_cma_create(drm, size);
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if (IS_ERR(cma_obj))
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return cma_obj;
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gem_obj = &cma_obj->base;
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/*
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* allocate a id of idr table where the obj is registered
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* and handle has the id what user can see.
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*/
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ret = drm_gem_handle_create(file_priv, gem_obj, handle);
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if (ret)
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goto err_handle_create;
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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_unreference_unlocked(gem_obj);
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return cma_obj;
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err_handle_create:
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drm_gem_cma_free_object(gem_obj);
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return ERR_PTR(ret);
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}
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/*
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* drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback
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* function
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*/
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void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
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{
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struct drm_gem_cma_object *cma_obj;
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2013-07-25 03:07:52 +08:00
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drm_gem_free_mmap_offset(gem_obj);
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2012-06-27 21:30:18 +08:00
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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2013-02-17 08:57:30 +08:00
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if (cma_obj->vaddr) {
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2013-02-17 08:54:26 +08:00
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dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
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cma_obj->vaddr, cma_obj->paddr);
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2013-02-17 08:57:30 +08:00
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} else if (gem_obj->import_attach) {
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drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
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}
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2013-02-17 08:54:26 +08:00
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drm_gem_object_release(gem_obj);
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2012-06-27 21:30:18 +08:00
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kfree(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_free_object);
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/*
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* drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback
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* function
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*
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* This aligns the pitch and size arguments to the minimum required. wrap
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* this into your own function if you need bigger alignment.
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*/
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int drm_gem_cma_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev, struct drm_mode_create_dumb *args)
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{
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struct drm_gem_cma_object *cma_obj;
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int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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if (args->pitch < min_pitch)
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args->pitch = min_pitch;
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if (args->size < args->pitch * args->height)
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args->size = args->pitch * args->height;
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cma_obj = drm_gem_cma_create_with_handle(file_priv, dev,
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args->size, &args->handle);
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2013-07-15 18:34:46 +08:00
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return PTR_ERR_OR_ZERO(cma_obj);
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2012-06-27 21:30:18 +08:00
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
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/*
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* drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback
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* function
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*/
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int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
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struct drm_device *drm, uint32_t handle, uint64_t *offset)
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{
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struct drm_gem_object *gem_obj;
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mutex_lock(&drm->struct_mutex);
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gem_obj = drm_gem_object_lookup(drm, file_priv, handle);
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if (!gem_obj) {
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dev_err(drm->dev, "failed to lookup gem object\n");
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mutex_unlock(&drm->struct_mutex);
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return -EINVAL;
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}
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2013-07-25 03:07:52 +08:00
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*offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
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2012-06-27 21:30:18 +08:00
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drm_gem_object_unreference(gem_obj);
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mutex_unlock(&drm->struct_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset);
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const struct vm_operations_struct drm_gem_cma_vm_ops = {
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);
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2013-04-16 20:32:34 +08:00
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static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
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struct vm_area_struct *vma)
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{
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int ret;
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2014-03-03 03:09:48 +08:00
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/*
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* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
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* vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
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* the whole buffer.
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*/
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_pgoff = 0;
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ret = dma_mmap_writecombine(cma_obj->base.dev->dev, vma,
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cma_obj->vaddr, cma_obj->paddr,
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vma->vm_end - vma->vm_start);
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2013-04-16 20:32:34 +08:00
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if (ret)
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drm_gem_vm_close(vma);
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return ret;
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}
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2012-06-27 21:30:18 +08:00
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/*
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* drm_gem_cma_mmap - (struct file_operation)->mmap callback function
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*/
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int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_gem_cma_object *cma_obj;
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2013-04-16 20:32:34 +08:00
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struct drm_gem_object *gem_obj;
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2012-06-27 21:30:18 +08:00
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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gem_obj = vma->vm_private_data;
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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2013-04-16 20:32:34 +08:00
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return drm_gem_cma_mmap_obj(cma_obj, vma);
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2012-06-27 21:30:18 +08:00
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
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2012-12-11 00:46:43 +08:00
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#ifdef CONFIG_DEBUG_FS
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void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m)
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{
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struct drm_gem_object *obj = &cma_obj->base;
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struct drm_device *dev = obj->dev;
|
2013-07-25 03:07:52 +08:00
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uint64_t off;
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2012-12-11 00:46:43 +08:00
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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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|
2013-07-25 03:07:52 +08:00
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off = drm_vma_node_start(&obj->vma_node);
|
2012-12-11 00:46:43 +08:00
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|
2014-03-05 02:10:17 +08:00
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seq_printf(m, "%2d (%2d) %08llx %pad %p %d",
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2012-12-11 00:46:43 +08:00
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obj->name, obj->refcount.refcount.counter,
|
2014-03-05 02:10:17 +08:00
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off, &cma_obj->paddr, cma_obj->vaddr, obj->size);
|
2012-12-11 00:46:43 +08:00
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seq_printf(m, "\n");
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
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#endif
|
2013-02-17 08:57:30 +08:00
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|
2013-06-28 13:24:54 +08:00
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/* low-level interface prime helpers */
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struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
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{
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struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
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struct sg_table *sgt;
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int ret;
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sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return NULL;
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ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
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cma_obj->paddr, obj->size);
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if (ret < 0)
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goto out;
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return sgt;
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out:
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kfree(sgt);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
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struct drm_gem_object *
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drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
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|
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struct sg_table *sgt)
|
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|
|
{
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|
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struct drm_gem_cma_object *cma_obj;
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if (sgt->nents != 1)
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return ERR_PTR(-EINVAL);
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|
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/* Create a CMA GEM buffer. */
|
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|
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cma_obj = __drm_gem_cma_create(dev, size);
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|
|
if (IS_ERR(cma_obj))
|
2014-07-03 20:03:33 +08:00
|
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|
return ERR_CAST(cma_obj);
|
2013-06-28 13:24:54 +08:00
|
|
|
|
|
|
|
cma_obj->paddr = sg_dma_address(sgt->sgl);
|
|
|
|
cma_obj->sgt = sgt;
|
|
|
|
|
2014-03-05 02:10:17 +08:00
|
|
|
DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &cma_obj->paddr, size);
|
2013-06-28 13:24:54 +08:00
|
|
|
|
|
|
|
return &cma_obj->base;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
|
|
|
|
|
|
|
|
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
|
|
|
|
struct vm_area_struct *vma)
|
|
|
|
{
|
|
|
|
struct drm_gem_cma_object *cma_obj;
|
|
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
|
|
ret = drm_gem_mmap_obj(obj, obj->size, vma);
|
|
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
cma_obj = to_drm_gem_cma_obj(obj);
|
|
|
|
return drm_gem_cma_mmap_obj(cma_obj, vma);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
|
|
|
|
|
|
|
|
void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
|
|
|
|
{
|
|
|
|
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
|
|
|
|
|
|
|
|
return cma_obj->vaddr;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
|
|
|
|
|
|
|
|
void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
|
|
|
|
{
|
|
|
|
/* Nothing to do */
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);
|