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/* Copyright (c) 2008-2010, Code Aurora Forum. 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 version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mempool.h>
#include <linux/mutex.h>
#include <linux/atomic.h>
#include "diagchar.h"
void *diagmem_alloc(struct diagchar_dev *driver, int size, int pool_type)
{
void *buf = NULL;
if (pool_type == POOL_TYPE_COPY) {
if (driver->diagpool) {
mutex_lock(&driver->diagmem_mutex);
if (driver->count < driver->poolsize) {
atomic_add(1, (atomic_t *)&driver->count);
buf = mempool_alloc(driver->diagpool,
GFP_ATOMIC);
}
mutex_unlock(&driver->diagmem_mutex);
}
} else if (pool_type == POOL_TYPE_HDLC) {
if (driver->diag_hdlc_pool) {
if (driver->count_hdlc_pool < driver->poolsize_hdlc) {
atomic_add(1,
(atomic_t *)&driver->count_hdlc_pool);
buf = mempool_alloc(driver->diag_hdlc_pool,
GFP_ATOMIC);
}
}
} else if (pool_type == POOL_TYPE_WRITE_STRUCT) {
if (driver->diag_write_struct_pool) {
if (driver->count_write_struct_pool <
driver->poolsize_write_struct) {
atomic_add(1,
(atomic_t *)&driver->count_write_struct_pool);
buf = mempool_alloc(
driver->diag_write_struct_pool, GFP_ATOMIC);
}
}
}
return buf;
}
void diagmem_exit(struct diagchar_dev *driver, int pool_type)
{
if (driver->diagpool) {
if (driver->count == 0 && driver->ref_count == 0) {
mempool_destroy(driver->diagpool);
driver->diagpool = NULL;
} else if (driver->ref_count == 0 && pool_type == POOL_TYPE_ALL)
printk(KERN_ALERT "Unable to destroy COPY mempool");
}
if (driver->diag_hdlc_pool) {
if (driver->count_hdlc_pool == 0 && driver->ref_count == 0) {
mempool_destroy(driver->diag_hdlc_pool);
driver->diag_hdlc_pool = NULL;
} else if (driver->ref_count == 0 && pool_type == POOL_TYPE_ALL)
printk(KERN_ALERT "Unable to destroy HDLC mempool");
}
if (driver->diag_write_struct_pool) {
/* Free up struct pool ONLY if there are no outstanding
transactions(aggregation buffer) with USB */
if (driver->count_write_struct_pool == 0 &&
driver->count_hdlc_pool == 0 && driver->ref_count == 0) {
mempool_destroy(driver->diag_write_struct_pool);
driver->diag_write_struct_pool = NULL;
} else if (driver->ref_count == 0 && pool_type == POOL_TYPE_ALL)
printk(KERN_ALERT "Unable to destroy STRUCT mempool");
}
}
void diagmem_free(struct diagchar_dev *driver, void *buf, int pool_type)
{
if (pool_type == POOL_TYPE_COPY) {
if (driver->diagpool != NULL && driver->count > 0) {
mempool_free(buf, driver->diagpool);
atomic_add(-1, (atomic_t *)&driver->count);
} else
pr_err("diag: Attempt to free up DIAG driver "
"mempool memory which is already free %d", driver->count);
} else if (pool_type == POOL_TYPE_HDLC) {
if (driver->diag_hdlc_pool != NULL &&
driver->count_hdlc_pool > 0) {
mempool_free(buf, driver->diag_hdlc_pool);
atomic_add(-1, (atomic_t *)&driver->count_hdlc_pool);
} else
pr_err("diag: Attempt to free up DIAG driver "
"HDLC mempool which is already free %d ", driver->count_hdlc_pool);
} else if (pool_type == POOL_TYPE_WRITE_STRUCT) {
if (driver->diag_write_struct_pool != NULL &&
driver->count_write_struct_pool > 0) {
mempool_free(buf, driver->diag_write_struct_pool);
atomic_add(-1,
(atomic_t *)&driver->count_write_struct_pool);
} else
pr_err("diag: Attempt to free up DIAG driver "
"USB structure mempool which is already free %d ",
driver->count_write_struct_pool);
}
diagmem_exit(driver, pool_type);
}
void diagmem_init(struct diagchar_dev *driver)
{
mutex_init(&driver->diagmem_mutex);
if (driver->count == 0)
driver->diagpool = mempool_create_kmalloc_pool(
driver->poolsize, driver->itemsize);
if (driver->count_hdlc_pool == 0)
driver->diag_hdlc_pool = mempool_create_kmalloc_pool(
driver->poolsize_hdlc, driver->itemsize_hdlc);
if (driver->count_write_struct_pool == 0)
driver->diag_write_struct_pool = mempool_create_kmalloc_pool(
driver->poolsize_write_struct, driver->itemsize_write_struct);
if (!driver->diagpool)
printk(KERN_INFO "Cannot allocate diag mempool\n");
if (!driver->diag_hdlc_pool)
printk(KERN_INFO "Cannot allocate diag HDLC mempool\n");
if (!driver->diag_write_struct_pool)
printk(KERN_INFO "Cannot allocate diag USB struct mempool\n");
}
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