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/*
* drivers/misc/tegra-profiler/mmap.c
*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/crc32.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/tegra_profiler.h>
#include "mmap.h"
#include "hrt.h"
#include "debug.h"
static struct quadd_mmap_ctx mmap_ctx;
static int binary_search_and_add(unsigned int *array,
unsigned int length, unsigned int key)
{
unsigned int i_min, i_max, mid;
if (length == 0) {
array[0] = key;
return 1;
} else if (length == 1 && array[0] == key) {
return 0;
}
i_min = 0;
i_max = length;
if (array[0] > key) {
memmove((char *)((unsigned int *)array + 1), array,
length * sizeof(unsigned int));
array[0] = key;
return 1;
} else if (array[length - 1] < key) {
array[length] = key;
return 1;
}
while (i_min < i_max) {
mid = i_min + (i_max - i_min) / 2;
if (key <= array[mid])
i_max = mid;
else
i_min = mid + 1;
}
if (array[i_max] == key) {
return 0;
} else {
memmove((char *)((unsigned int *)array + i_max + 1),
(char *)((unsigned int *)array + i_max),
(length - i_max) * sizeof(unsigned int));
array[i_max] = key;
return 1;
}
}
static int check_hash(u32 key)
{
int res;
unsigned long flags;
spin_lock_irqsave(&mmap_ctx.lock, flags);
if (mmap_ctx.nr_hashes >= QUADD_MMAP_SIZE_ARRAY) {
spin_unlock_irqrestore(&mmap_ctx.lock, flags);
return 1;
}
res = binary_search_and_add(mmap_ctx.hash_array,
mmap_ctx.nr_hashes, key);
if (res > 0) {
mmap_ctx.nr_hashes++;
spin_unlock_irqrestore(&mmap_ctx.lock, flags);
return 0;
}
spin_unlock_irqrestore(&mmap_ctx.lock, flags);
return 1;
}
char *quadd_get_mmap(struct quadd_cpu_context *cpu_ctx,
struct pt_regs *regs, struct quadd_mmap_data *sample,
unsigned int *extra_length)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct file *vm_file;
struct path *path;
char *file_name = NULL;
int length, length_aligned;
u32 crc;
unsigned long ip;
if (!mm) {
*extra_length = 0;
return NULL;
}
ip = instruction_pointer(regs);
if (user_mode(regs)) {
for (vma = find_vma(mm, ip); vma; vma = vma->vm_next) {
if (ip < vma->vm_start || ip >= vma->vm_end)
continue;
vm_file = vma->vm_file;
if (!vm_file)
break;
path = &vm_file->f_path;
file_name = d_path(path, mmap_ctx.tmp_buf, PATH_MAX);
if (file_name) {
sample->addr = vma->vm_start;
sample->len = vma->vm_end - vma->vm_start;
sample->pgoff =
(u64)vma->vm_pgoff << PAGE_SHIFT;
}
break;
}
} else {
struct module *mod;
preempt_disable();
mod = __module_address(ip);
preempt_enable();
if (mod) {
file_name = mod->name;
if (file_name) {
sample->addr = (u32) mod->module_core;
sample->len = mod->core_size;
sample->pgoff = 0;
}
}
}
if (file_name) {
length = strlen(file_name);
if (length >= PATH_MAX) {
*extra_length = 0;
return NULL;
}
crc = crc32_le(~0, file_name, length);
crc = crc32_le(crc, (unsigned char *)&sample->addr,
sizeof(sample->addr));
crc = crc32_le(crc, (unsigned char *)&sample->len,
sizeof(sample->len));
if (!check_hash(crc)) {
strcpy(cpu_ctx->mmap_filename, file_name);
length_aligned = (length + 1 + 7) & (~7);
*extra_length = length_aligned;
return cpu_ctx->mmap_filename;
}
}
*extra_length = 0;
return NULL;
}
struct quadd_mmap_ctx *quadd_mmap_init(struct quadd_ctx *quadd_ctx)
{
u32 *hash;
char *tmp;
mmap_ctx.quadd_ctx = quadd_ctx;
hash = kzalloc(QUADD_MMAP_SIZE_ARRAY * sizeof(unsigned int),
GFP_KERNEL);
if (!hash) {
pr_err("Alloc error\n");
return NULL;
}
mmap_ctx.hash_array = hash;
mmap_ctx.nr_hashes = 0;
spin_lock_init(&mmap_ctx.lock);
tmp = kzalloc(PATH_MAX + sizeof(unsigned long long),
GFP_KERNEL);
if (!tmp) {
pr_err("Alloc error\n");
return NULL;
}
mmap_ctx.tmp_buf = tmp;
return &mmap_ctx;
}
void quadd_mmap_reset(void)
{
unsigned long flags;
spin_lock_irqsave(&mmap_ctx.lock, flags);
mmap_ctx.nr_hashes = 0;
spin_unlock_irqrestore(&mmap_ctx.lock, flags);
}
void quadd_mmap_deinit(void)
{
unsigned long flags;
spin_lock_irqsave(&mmap_ctx.lock, flags);
kfree(mmap_ctx.hash_array);
mmap_ctx.hash_array = NULL;
kfree(mmap_ctx.tmp_buf);
mmap_ctx.tmp_buf = NULL;
spin_unlock_irqrestore(&mmap_ctx.lock, flags);
}
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