// SPDX-License-Identifier: GPL-2.0
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/*
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* drivers/staging/android/ion/ion_chunk_heap.c
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*
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* Copyright (C) 2012 Google, Inc.
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*/
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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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struct ion_chunk_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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unsigned long chunk_size;
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unsigned long size;
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unsigned long allocated;
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};
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static int ion_chunk_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 ion_chunk_heap *chunk_heap =
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container_of(heap, struct ion_chunk_heap, heap);
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struct sg_table *table;
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struct scatterlist *sg;
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int ret, i;
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unsigned long num_chunks;
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unsigned long allocated_size;
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allocated_size = ALIGN(size, chunk_heap->chunk_size);
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num_chunks = allocated_size / chunk_heap->chunk_size;
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if (allocated_size > chunk_heap->size - chunk_heap->allocated)
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return -ENOMEM;
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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, num_chunks, GFP_KERNEL);
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if (ret) {
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kfree(table);
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return ret;
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}
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sg = table->sgl;
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for (i = 0; i < num_chunks; i++) {
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unsigned long paddr = gen_pool_alloc(chunk_heap->pool,
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chunk_heap->chunk_size);
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if (!paddr)
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goto err;
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sg_set_page(sg, pfn_to_page(PFN_DOWN(paddr)),
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chunk_heap->chunk_size, 0);
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sg = sg_next(sg);
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}
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buffer->sg_table = table;
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chunk_heap->allocated += allocated_size;
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return 0;
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err:
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sg = table->sgl;
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for (i -= 1; i >= 0; i--) {
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gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
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sg->length);
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sg = sg_next(sg);
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}
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sg_free_table(table);
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kfree(table);
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return -ENOMEM;
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}
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static void ion_chunk_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 ion_chunk_heap *chunk_heap =
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container_of(heap, struct ion_chunk_heap, heap);
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struct sg_table *table = buffer->sg_table;
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struct scatterlist *sg;
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int i;
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unsigned long allocated_size;
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allocated_size = ALIGN(buffer->size, chunk_heap->chunk_size);
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ion_heap_buffer_zero(buffer);
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for_each_sg(table->sgl, sg, table->nents, i) {
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gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
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sg->length);
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}
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chunk_heap->allocated -= allocated_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 chunk_heap_ops = {
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.allocate = ion_chunk_heap_allocate,
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.free = ion_chunk_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_chunk_heap_create(struct ion_platform_heap *heap_data)
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{
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struct ion_chunk_heap *chunk_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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chunk_heap = kzalloc(sizeof(*chunk_heap), GFP_KERNEL);
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if (!chunk_heap)
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return ERR_PTR(-ENOMEM);
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chunk_heap->chunk_size = (unsigned long)heap_data->priv;
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chunk_heap->pool = gen_pool_create(get_order(chunk_heap->chunk_size) +
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PAGE_SHIFT, -1);
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if (!chunk_heap->pool) {
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ret = -ENOMEM;
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goto error_gen_pool_create;
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}
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chunk_heap->base = heap_data->base;
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chunk_heap->size = heap_data->size;
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chunk_heap->allocated = 0;
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gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1);
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chunk_heap->heap.ops = &chunk_heap_ops;
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chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
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chunk_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
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pr_debug("%s: base %pa size %zu\n", __func__,
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&chunk_heap->base, heap_data->size);
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return &chunk_heap->heap;
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error_gen_pool_create:
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kfree(chunk_heap);
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return ERR_PTR(ret);
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}
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