// SPDX-License-Identifier: GPL-2.0
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/*
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* drivers/staging/android/ion/ion_carveout_heap.c
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*
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* Copyright (C) 2011 Google, Inc.
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*/
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#include <linux/spinlock.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/genalloc.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "ion.h"
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#define ION_CARVEOUT_ALLOCATE_FAIL -1
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struct ion_carveout_heap {
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struct ion_heap heap;
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struct gen_pool *pool;
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phys_addr_t base;
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};
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static phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
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unsigned long size)
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{
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struct ion_carveout_heap *carveout_heap =
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container_of(heap, struct ion_carveout_heap, heap);
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unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
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if (!offset)
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return ION_CARVEOUT_ALLOCATE_FAIL;
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return offset;
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}
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static void ion_carveout_free(struct ion_heap *heap, phys_addr_t addr,
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unsigned long size)
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{
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struct ion_carveout_heap *carveout_heap =
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container_of(heap, struct ion_carveout_heap, heap);
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if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
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return;
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gen_pool_free(carveout_heap->pool, addr, size);
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}
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static int ion_carveout_heap_allocate(struct ion_heap *heap,
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struct ion_buffer *buffer,
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unsigned long size,
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unsigned long flags)
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{
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struct sg_table *table;
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phys_addr_t paddr;
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int ret;
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table = kmalloc(sizeof(*table), GFP_KERNEL);
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if (!table)
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return -ENOMEM;
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ret = sg_alloc_table(table, 1, GFP_KERNEL);
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if (ret)
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goto err_free;
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paddr = ion_carveout_allocate(heap, size);
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if (paddr == ION_CARVEOUT_ALLOCATE_FAIL) {
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ret = -ENOMEM;
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goto err_free_table;
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}
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sg_set_page(table->sgl, pfn_to_page(PFN_DOWN(paddr)), size, 0);
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buffer->sg_table = table;
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return 0;
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err_free_table:
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sg_free_table(table);
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err_free:
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kfree(table);
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return ret;
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}
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static void ion_carveout_heap_free(struct ion_buffer *buffer)
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{
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struct ion_heap *heap = buffer->heap;
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struct sg_table *table = buffer->sg_table;
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struct page *page = sg_page(table->sgl);
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phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
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ion_heap_buffer_zero(buffer);
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ion_carveout_free(heap, paddr, buffer->size);
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sg_free_table(table);
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kfree(table);
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}
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static struct ion_heap_ops carveout_heap_ops = {
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.allocate = ion_carveout_heap_allocate,
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.free = ion_carveout_heap_free,
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.map_user = ion_heap_map_user,
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.map_kernel = ion_heap_map_kernel,
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.unmap_kernel = ion_heap_unmap_kernel,
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};
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struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
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{
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struct ion_carveout_heap *carveout_heap;
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int ret;
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struct page *page;
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size_t size;
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page = pfn_to_page(PFN_DOWN(heap_data->base));
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size = heap_data->size;
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ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
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if (ret)
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return ERR_PTR(ret);
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carveout_heap = kzalloc(sizeof(*carveout_heap), GFP_KERNEL);
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if (!carveout_heap)
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return ERR_PTR(-ENOMEM);
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carveout_heap->pool = gen_pool_create(PAGE_SHIFT, -1);
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if (!carveout_heap->pool) {
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kfree(carveout_heap);
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return ERR_PTR(-ENOMEM);
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}
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carveout_heap->base = heap_data->base;
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gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
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-1);
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carveout_heap->heap.ops = &carveout_heap_ops;
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carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
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carveout_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
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return &carveout_heap->heap;
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}
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