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- /*
- * Copyright (C) 2022 Alibaba Group. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include <linux/module.h>
- #include <linux/pagemap.h>
- #include <linux/mman.h>
- #include <linux/cdev.h>
- #include <linux/errno.h>
- #include <linux/dma-mapping.h>
- #include <linux/dma-buf.h>
- #include <linux/version.h>
- #include <linux/platform_device.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/genalloc.h>
- #include "rsvmem_pool.h"
- /* 12 bits (4096 bytes) */
- #define GEN_POOL_ALLOC_ORDER 12
- static rsvmem_pool_info_t rsvmem_pool_regions[MAX_RSVMEM_REGION_COUNT];
- int rsvmem_pool_create(struct device *dev)
- {
- struct device_node *np = dev->of_node;
- struct device_node *rsvmem_node;
- struct resource res;
- int pool_id = 0;
- int ret;
- if (!dev || !dev->of_node)
- return -EINVAL;
- rsvmem_node = of_parse_phandle(np, "memory-region", 0);
- if (!rsvmem_node) {
- dev_notice(dev, "No memory region node\n");
- return -ENODEV;
- }
- while (pool_id < MAX_RSVMEM_REGION_COUNT &&
- of_address_to_resource(rsvmem_node, pool_id, &res) == 0) {
- struct gen_pool *pool = gen_pool_create(GEN_POOL_ALLOC_ORDER, -1);
- if (pool == NULL) {
- dev_err(dev, "Failed to create reserved memory pool region[%d]\n", pool_id);
- return -ENOMEM;
- }
- ret = gen_pool_add(pool, res.start, resource_size(&res), -1);
- if (ret) {
- dev_err(dev, "%s: gen_pool_add failed\n", __func__);
- gen_pool_destroy(pool);
- return ret;
- }
- rsvmem_pool_regions[pool_id].pool = pool;
- rsvmem_pool_regions[pool_id].base = res.start;
- rsvmem_pool_regions[pool_id].size = resource_size(&res);
- dev_err(dev, "%s: rsvmem_pool_region[%d] = {pool=%px, base=0x%llx, size=0x%llx}\n",
- __func__, pool_id, rsvmem_pool_regions[pool_id].pool,
- rsvmem_pool_regions[pool_id].base, rsvmem_pool_regions[pool_id].size);
- pool_id ++;
- }
- return 0;
- }
- void rsvmem_pool_destroy(void)
- {
- int i;
- for (i = 0; i < MAX_RSVMEM_REGION_COUNT; i++) {
- if (rsvmem_pool_regions[i].pool != NULL) {
- gen_pool_destroy(rsvmem_pool_regions[i].pool);
- memset(&rsvmem_pool_regions[i], 0, sizeof(rsvmem_pool_info_t));
- }
- }
- }
- unsigned long rsvmem_pool_alloc(int region_id, size_t size)
- {
- struct gen_pool *pool;
- unsigned long addr;
- if (region_id < 0 || region_id >= MAX_RSVMEM_REGION_COUNT) {
- pr_err("%s: region_id(%d) is invalid\n", __func__, region_id);
- return 0;
- }
- pool = rsvmem_pool_regions[region_id].pool;
- if (pool == NULL) {
- pr_err("%s: pool region[%d] is invalid\n", __func__, region_id);
- return 0;
- }
- addr = gen_pool_alloc(pool, size);
- pr_debug("%s: Allocated %zu bytes from pool region[%d]: 0x%08lx\n", __func__, size, region_id, addr);
- return addr;
- }
- void rsvmem_pool_free(int region_id, size_t size, unsigned long addr)
- {
- struct gen_pool *pool;
- if (region_id < 0 || region_id >= MAX_RSVMEM_REGION_COUNT) {
- pr_err("%s: region_id(%d) is invalid\n", __func__, region_id);
- return;
- }
- pool = rsvmem_pool_regions[region_id].pool;
- if (pool == NULL) {
- pr_err("%s: rsvmem pool region[%d] is invalid\n", __func__, region_id);
- return;
- }
- gen_pool_free(pool, addr, size);
- }
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