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kernel_samsung_sm7125/drivers/char/diag/diagmem.c

299 lines
6.6 KiB

/* Copyright (c) 2008-2014, 2016-2017, 2019 The Linux Foundation. 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/slab.h>
#include <linux/of.h>
#include <linux/kmemleak.h>
#include <linux/ratelimit.h>
#include <linux/atomic.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/kmemleak.h>
#include "diagchar.h"
#include "diagmem.h"
struct diag_mempool_t diag_mempools[NUM_MEMORY_POOLS] = {
{
.id = POOL_TYPE_COPY,
.name = "POOL_COPY",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_HDLC,
.name = "POOL_HDLC",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_USER,
.name = "POOL_USER",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MUX_APPS,
.name = "POOL_MUX_APPS",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_DCI,
.name = "POOL_DCI",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
#ifdef CONFIG_DIAGFWD_BRIDGE_CODE
{
.id = POOL_TYPE_MDM,
.name = "POOL_MDM",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM2,
.name = "POOL_MDM2",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM_DCI,
.name = "POOL_MDM_DCI",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM2_DCI,
.name = "POOL_MDM2_DCI",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM_MUX,
.name = "POOL_MDM_MUX",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM2_MUX,
.name = "POOL_MDM2_MUX",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM_DCI_WRITE,
.name = "POOL_MDM_DCI_WRITE",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_MDM2_DCI_WRITE,
.name = "POOL_MDM2_DCI_WRITE",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
},
{
.id = POOL_TYPE_QSC_MUX,
.name = "POOL_QSC_MUX",
.pool = NULL,
.itemsize = 0,
.poolsize = 0,
.count = 0
}
#endif
};
void diagmem_setsize(int pool_idx, int itemsize, int poolsize)
{
if (pool_idx < 0 || pool_idx >= NUM_MEMORY_POOLS) {
pr_err("diag: Invalid pool index %d in %s\n", pool_idx,
__func__);
return;
}
diag_mempools[pool_idx].itemsize = itemsize;
if (diag_mempools[pool_idx].pool)
diag_mempools[pool_idx].pool->pool_data =
(void *)(uintptr_t)itemsize;
diag_mempools[pool_idx].poolsize = poolsize;
pr_debug("diag: Mempool %s sizes: itemsize %d poolsize %d\n",
diag_mempools[pool_idx].name, diag_mempools[pool_idx].itemsize,
diag_mempools[pool_idx].poolsize);
}
void *diagmem_alloc(struct diagchar_dev *driver, int size, int pool_type)
{
void *buf = NULL;
int i = 0;
unsigned long flags;
struct diag_mempool_t *mempool = NULL;
if (!driver)
return NULL;
for (i = 0; i < NUM_MEMORY_POOLS; i++) {
mempool = &diag_mempools[i];
if (pool_type != mempool->id)
continue;
if (!mempool->pool) {
pr_err_ratelimited("diag: %s mempool is not initialized yet\n",
mempool->name);
break;
}
if (size == 0 || size > mempool->itemsize ||
size > (int)mempool->pool->pool_data) {
pr_err_ratelimited("diag: cannot alloc from mempool %s, invalid size: %d\n",
mempool->name, size);
break;
}
spin_lock_irqsave(&mempool->lock, flags);
if (mempool->count < mempool->poolsize) {
atomic_add(1, (atomic_t *)&mempool->count);
buf = mempool_alloc(mempool->pool, GFP_ATOMIC);
kmemleak_not_leak(buf);
}
spin_unlock_irqrestore(&mempool->lock, flags);
if (!buf) {
pr_debug_ratelimited("diag: Unable to allocate buffer from memory pool %s, size: %d/%d count: %d/%d\n",
mempool->name,
size, mempool->itemsize,
mempool->count,
mempool->poolsize);
}
break;
}
return buf;
}
void diagmem_free(struct diagchar_dev *driver, void *buf, int pool_type)
{
int i = 0;
unsigned long flags;
struct diag_mempool_t *mempool = NULL;
if (!driver || !buf)
return;
for (i = 0; i < NUM_MEMORY_POOLS; i++) {
mempool = &diag_mempools[i];
if (pool_type != mempool->id)
continue;
if (!mempool->pool) {
pr_err_ratelimited("diag: %s mempool is not initialized yet\n",
mempool->name);
break;
}
spin_lock_irqsave(&mempool->lock, flags);
if (mempool->count > 0 && buf) {
mempool_free(buf, mempool->pool);
atomic_add(-1, (atomic_t *)&mempool->count);
} else {
pr_err_ratelimited("diag: Attempting to free items from %s mempool which is already empty\n",
mempool->name);
}
spin_unlock_irqrestore(&mempool->lock, flags);
break;
}
}
void diagmem_init(struct diagchar_dev *driver, int index)
{
struct diag_mempool_t *mempool = NULL;
if (!driver)
return;
if (index < 0 || index >= NUM_MEMORY_POOLS) {
pr_err("diag: In %s, Invalid index %d\n", __func__, index);
return;
}
mempool = &diag_mempools[index];
if (mempool->pool) {
pr_debug("diag: mempool %s is already initialized\n",
mempool->name);
return;
}
if (mempool->itemsize <= 0 || mempool->poolsize <= 0) {
pr_err("diag: Unable to initialize %s mempool, itemsize: %d poolsize: %d\n",
mempool->name, mempool->itemsize,
mempool->poolsize);
return;
}
mempool->pool = mempool_create_kmalloc_pool(mempool->poolsize,
mempool->itemsize);
if (!mempool->pool)
pr_err("diag: cannot allocate %s mempool\n", mempool->name);
else
kmemleak_not_leak(mempool->pool);
spin_lock_init(&mempool->lock);
}
void diagmem_exit(struct diagchar_dev *driver, int index)
{
unsigned long flags;
struct diag_mempool_t *mempool = NULL;
if (!driver)
return;
if (index < 0 || index >= NUM_MEMORY_POOLS) {
pr_err("diag: In %s, Invalid index %d\n", __func__, index);
return;
}
mempool = &diag_mempools[index];
spin_lock_irqsave(&mempool->lock, flags);
if (mempool->count == 0 && mempool->pool != NULL) {
mempool_destroy(mempool->pool);
mempool->pool = NULL;
} else {
pr_err("diag: Unable to destroy %s pool, count: %d\n",
mempool->name, mempool->count);
}
spin_unlock_irqrestore(&mempool->lock, flags);
}