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/*
* drivers/misc/tegra-profiler/mmap.c
*
* Copyright (c) 2015, 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/mm.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/tegra_profiler.h>
#include "mmap.h"
#include "comm.h"
#include "hrt.h"
static void
put_mmap_sample(struct quadd_mmap_data *s, char *filename,
size_t length, unsigned long pgoff, int is_file_exists)
{
u64 mmap_ed = 0;
struct quadd_record_data r;
struct quadd_iovec vec[3];
u64 pgoff_val = (u64)pgoff << PAGE_SHIFT;
r.record_type = QUADD_RECORD_TYPE_MMAP;
memcpy(&r.mmap, s, sizeof(*s));
r.mmap.filename_length = length;
if (is_file_exists)
mmap_ed |= QUADD_MMAP_ED_IS_FILE_EXISTS;
vec[0].base = &pgoff_val;
vec[0].len = sizeof(pgoff_val);
vec[1].base = &mmap_ed;
vec[1].len = sizeof(mmap_ed);
vec[2].base = filename;
vec[2].len = length;
pr_debug("MMAP: pid: %u, file_name: '%s', addr: %#llx - %#llx, len: %llx, pgoff: %#llx\n",
s->pid, filename,
s->addr, s->addr + s->len, s->len, pgoff_val);
quadd_put_sample(&r, vec, ARRAY_SIZE(vec));
}
void quadd_process_mmap(struct vm_area_struct *vma, pid_t pid)
{
int is_file_exists;
struct file *vm_file;
struct path *path;
char *file_name, *tmp_buf = NULL;
struct quadd_mmap_data sample;
size_t length, length_aligned;
if (!vma)
return;
if (!(vma->vm_flags & VM_EXEC))
return;
tmp_buf = kzalloc(PATH_MAX + sizeof(u64), GFP_ATOMIC);
if (!tmp_buf)
return;
vm_file = vma->vm_file;
if (vm_file) {
path = &vm_file->f_path;
file_name = d_path(path, tmp_buf, PATH_MAX);
if (IS_ERR(file_name))
goto out;
length = strlen(file_name) + 1;
is_file_exists = 1;
} else {
const char *name = NULL;
name = arch_vma_name(vma);
if (!name) {
struct mm_struct *mm = vma->vm_mm;
if (!mm) {
name = "[vdso]";
} else if (vma->vm_start <= mm->start_brk &&
vma->vm_end >= mm->brk) {
name = "[heap]";
} else if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
name = "[stack]";
}
}
if (name)
strcpy(tmp_buf, name);
else
sprintf(tmp_buf, "[vma:%08lx-%08lx]",
vma->vm_start, vma->vm_end);
file_name = tmp_buf;
length = strlen(file_name) + 1;
is_file_exists = 0;
}
length_aligned = ALIGN(length, sizeof(u64));
sample.pid = pid;
sample.user_mode = 1;
sample.addr = vma->vm_start;
sample.len = vma->vm_end - vma->vm_start;
put_mmap_sample(&sample, file_name, length_aligned,
vma->vm_pgoff, is_file_exists);
out:
kfree(tmp_buf);
}
int quadd_get_current_mmap(pid_t pid)
{
int is_file_exists;
struct vm_area_struct *vma;
struct file *vm_file;
struct path *path;
char *file_name;
struct task_struct *task;
struct mm_struct *mm;
struct quadd_mmap_data sample;
size_t length, length_aligned;
char *tmp_buf;
rcu_read_lock();
task = pid_task(find_vpid(pid), PIDTYPE_PID);
rcu_read_unlock();
if (!task) {
pr_err("Process not found: %d\n", pid);
return -ESRCH;
}
mm = task->mm;
if (!mm) {
pr_warn("mm is not existed for task: %d\n", pid);
return 0;
}
pr_info("Get mapped memory objects\n");
tmp_buf = kzalloc(PATH_MAX + sizeof(u64), GFP_ATOMIC);
if (!tmp_buf)
return -ENOMEM;
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (!(vma->vm_flags & VM_EXEC))
continue;
vm_file = vma->vm_file;
if (vm_file) {
path = &vm_file->f_path;
file_name = d_path(path, tmp_buf, PATH_MAX);
if (IS_ERR(file_name))
continue;
length = strlen(file_name) + 1;
is_file_exists = 1;
} else {
const char *name = NULL;
name = arch_vma_name(vma);
if (!name) {
mm = vma->vm_mm;
if (!mm) {
name = "[vdso]";
} else if (vma->vm_start <= mm->start_brk &&
vma->vm_end >= mm->brk) {
name = "[heap]";
} else if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
name = "[stack]";
}
}
if (name)
strcpy(tmp_buf, name);
else
sprintf(tmp_buf, "[vma:%08lx-%08lx]",
vma->vm_start, vma->vm_end);
file_name = tmp_buf;
length = strlen(file_name) + 1;
is_file_exists = 0;
}
length_aligned = ALIGN(length, sizeof(u64));
sample.pid = pid;
sample.user_mode = 1;
sample.addr = vma->vm_start;
sample.len = vma->vm_end - vma->vm_start;
put_mmap_sample(&sample, file_name, length_aligned,
vma->vm_pgoff, is_file_exists);
}
kfree(tmp_buf);
return 0;
}
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