mirror of
https://github.com/thead-yocto-mirror/video_memory
synced 2026-06-21 09:12:27 +02:00
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*
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* Copyright (C) 2022 Alibaba Group. All rights reserved.
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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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*
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/mman.h>
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#include <linux/cdev.h>
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#include <linux/errno.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-buf.h>
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#include <linux/version.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/genalloc.h>
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#include "rsvmem_pool.h"
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/* 12 bits (4096 bytes) */
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#define GEN_POOL_ALLOC_ORDER 12
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static rsvmem_pool_info_t rsvmem_pool_regions[MAX_RSVMEM_REGION_COUNT];
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int rsvmem_pool_create(struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct device_node *rsvmem_node;
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struct resource res;
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int pool_id = 0;
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int ret;
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if (!dev || !dev->of_node)
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return -EINVAL;
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rsvmem_node = of_parse_phandle(np, "memory-region", 0);
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if (!rsvmem_node) {
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dev_notice(dev, "No memory region node\n");
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return -ENODEV;
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}
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while (pool_id < MAX_RSVMEM_REGION_COUNT &&
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of_address_to_resource(rsvmem_node, pool_id, &res) == 0) {
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struct gen_pool *pool = gen_pool_create(GEN_POOL_ALLOC_ORDER, -1);
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if (pool == NULL) {
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dev_err(dev, "Failed to create reserved memory pool region[%d]\n", pool_id);
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return -ENOMEM;
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}
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ret = gen_pool_add(pool, res.start, resource_size(&res), -1);
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if (ret) {
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dev_err(dev, "%s: gen_pool_add failed\n", __func__);
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gen_pool_destroy(pool);
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return ret;
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}
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rsvmem_pool_regions[pool_id].pool = pool;
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rsvmem_pool_regions[pool_id].base = res.start;
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rsvmem_pool_regions[pool_id].size = resource_size(&res);
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dev_err(dev, "%s: rsvmem_pool_region[%d] = {pool=%px, base=0x%llx, size=0x%llx}\n",
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__func__, pool_id, rsvmem_pool_regions[pool_id].pool,
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rsvmem_pool_regions[pool_id].base, rsvmem_pool_regions[pool_id].size);
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pool_id ++;
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}
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return 0;
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}
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void rsvmem_pool_destroy(void)
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{
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int i;
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for (i = 0; i < MAX_RSVMEM_REGION_COUNT; i++) {
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if (rsvmem_pool_regions[i].pool != NULL) {
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gen_pool_destroy(rsvmem_pool_regions[i].pool);
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memset(&rsvmem_pool_regions[i], 0, sizeof(rsvmem_pool_info_t));
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}
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}
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}
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unsigned long rsvmem_pool_alloc(int region_id, size_t size)
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{
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struct gen_pool *pool;
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unsigned long addr;
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if (region_id < 0 || region_id >= MAX_RSVMEM_REGION_COUNT) {
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pr_err("%s: region_id(%d) is invalid\n", __func__, region_id);
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return 0;
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}
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pool = rsvmem_pool_regions[region_id].pool;
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if (pool == NULL) {
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pr_err("%s: pool region[%d] is invalid\n", __func__, region_id);
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return 0;
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}
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addr = gen_pool_alloc(pool, size);
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pr_debug("%s: Allocated %zu bytes from pool region[%d]: 0x%08lx\n", __func__, size, region_id, addr);
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return addr;
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}
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void rsvmem_pool_free(int region_id, size_t size, unsigned long addr)
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{
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struct gen_pool *pool;
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if (region_id < 0 || region_id >= MAX_RSVMEM_REGION_COUNT) {
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pr_err("%s: region_id(%d) is invalid\n", __func__, region_id);
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return;
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}
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pool = rsvmem_pool_regions[region_id].pool;
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if (pool == NULL) {
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pr_err("%s: rsvmem pool region[%d] is invalid\n", __func__, region_id);
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return;
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}
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gen_pool_free(pool, addr, size);
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}
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