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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/alloc_tag.h>
#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_buf.h>
#include <linux/seq_file.h>
static struct codetag_type *alloc_tag_cttype;
DEFINE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT,
mem_alloc_profiling_key);
static void *allocinfo_start(struct seq_file *m, loff_t *pos)
{
struct codetag_iterator *iter;
struct codetag *ct;
loff_t node = *pos;
iter = kzalloc(sizeof(*iter), GFP_KERNEL);
m->private = iter;
if (!iter)
return NULL;
codetag_lock_module_list(alloc_tag_cttype, true);
*iter = codetag_get_ct_iter(alloc_tag_cttype);
while ((ct = codetag_next_ct(iter)) != NULL && node)
node--;
return ct ? iter : NULL;
}
static void *allocinfo_next(struct seq_file *m, void *arg, loff_t *pos)
{
struct codetag_iterator *iter = (struct codetag_iterator *)arg;
struct codetag *ct = codetag_next_ct(iter);
(*pos)++;
if (!ct)
return NULL;
return iter;
}
static void allocinfo_stop(struct seq_file *m, void *arg)
{
struct codetag_iterator *iter = (struct codetag_iterator *)m->private;
if (iter) {
codetag_lock_module_list(alloc_tag_cttype, false);
kfree(iter);
}
}
static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct)
{
struct alloc_tag *tag = ct_to_alloc_tag(ct);
struct alloc_tag_counters counter = alloc_tag_read(tag);
s64 bytes = counter.bytes;
char val[10], *p = val;
if (bytes < 0) {
*p++ = '-';
bytes = -bytes;
}
string_get_size(bytes, 1,
STRING_SIZE_BASE2|STRING_SIZE_NOSPACE,
p, val + ARRAY_SIZE(val) - p);
seq_buf_printf(out, "%8s %8llu ", val, counter.calls);
codetag_to_text(out, ct);
seq_buf_putc(out, ' ');
seq_buf_putc(out, '\n');
}
static int allocinfo_show(struct seq_file *m, void *arg)
{
struct codetag_iterator *iter = (struct codetag_iterator *)arg;
char *bufp;
size_t n = seq_get_buf(m, &bufp);
struct seq_buf buf;
seq_buf_init(&buf, bufp, n);
alloc_tag_to_text(&buf, iter->ct);
seq_commit(m, seq_buf_used(&buf));
return 0;
}
static const struct seq_operations allocinfo_seq_op = {
.start = allocinfo_start,
.next = allocinfo_next,
.stop = allocinfo_stop,
.show = allocinfo_show,
};
static void __init procfs_init(void)
{
proc_create_seq("allocinfo", 0444, NULL, &allocinfo_seq_op);
}
static bool alloc_tag_module_unload(struct codetag_type *cttype,
struct codetag_module *cmod)
{
struct codetag_iterator iter = codetag_get_ct_iter(cttype);
struct alloc_tag_counters counter;
bool module_unused = true;
struct alloc_tag *tag;
struct codetag *ct;
for (ct = codetag_next_ct(&iter); ct; ct = codetag_next_ct(&iter)) {
if (iter.cmod != cmod)
continue;
tag = ct_to_alloc_tag(ct);
counter = alloc_tag_read(tag);
if (WARN(counter.bytes, "%s:%u module %s func:%s has %llu allocated at module unload",
ct->filename, ct->lineno, ct->modname, ct->function, counter.bytes))
module_unused = false;
}
return module_unused;
}
static struct ctl_table memory_allocation_profiling_sysctls[] = {
{
.procname = "mem_profiling",
.data = &mem_alloc_profiling_key,
#ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG
.mode = 0444,
#else
.mode = 0644,
#endif
.proc_handler = proc_do_static_key,
},
{ }
};
static int __init alloc_tag_init(void)
{
const struct codetag_type_desc desc = {
.section = "alloc_tags",
.tag_size = sizeof(struct alloc_tag),
.module_unload = alloc_tag_module_unload,
};
alloc_tag_cttype = codetag_register_type(&desc);
if (IS_ERR_OR_NULL(alloc_tag_cttype))
return PTR_ERR(alloc_tag_cttype);
register_sysctl_init("vm", memory_allocation_profiling_sysctls);
procfs_init();
return 0;
}
module_init(alloc_tag_init);
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