2012-06-27 13:30:18 +00:00
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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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#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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static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj)
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{
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return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT;
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}
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static void drm_gem_cma_buf_destroy(struct drm_device *drm,
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struct drm_gem_cma_object *cma_obj)
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{
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dma_free_writecombine(drm->dev, cma_obj->base.size, cma_obj->vaddr,
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cma_obj->paddr);
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}
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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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struct drm_gem_object *gem_obj;
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int ret;
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size = round_up(size, PAGE_SIZE);
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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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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", size);
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ret = -ENOMEM;
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goto err_dma_alloc;
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}
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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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goto err_obj_init;
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ret = drm_gem_create_mmap_offset(gem_obj);
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if (ret)
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goto err_create_mmap_offset;
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return cma_obj;
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err_create_mmap_offset:
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drm_gem_object_release(gem_obj);
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err_obj_init:
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drm_gem_cma_buf_destroy(drm, cma_obj);
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err_dma_alloc:
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kfree(cma_obj);
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return ERR_PTR(ret);
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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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if (gem_obj->map_list.map)
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drm_gem_free_mmap_offset(gem_obj);
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drm_gem_object_release(gem_obj);
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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drm_gem_cma_buf_destroy(gem_obj->dev, cma_obj);
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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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if (IS_ERR(cma_obj))
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return PTR_ERR(cma_obj);
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return 0;
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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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*offset = get_gem_mmap_offset(gem_obj);
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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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/*
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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_object *gem_obj;
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struct drm_gem_cma_object *cma_obj;
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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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ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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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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EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
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/*
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* drm_gem_cma_dumb_destroy - (struct drm_driver)->dumb_destroy callback function
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*/
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int drm_gem_cma_dumb_destroy(struct drm_file *file_priv,
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struct drm_device *drm, unsigned int handle)
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{
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return drm_gem_handle_delete(file_priv, handle);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_destroy);
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2012-12-10 16:46:43 +00:00
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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;
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uint64_t off = 0;
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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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if (obj->map_list.map)
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off = (uint64_t)obj->map_list.hash.key;
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seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d",
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obj->name, obj->refcount.refcount.counter,
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off, cma_obj->paddr, cma_obj->vaddr, obj->size);
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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
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