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pginfo.h
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pginfo.h
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#include <stdint.h>
#include <limits.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
struct pagestat {
unsigned long pfn;
unsigned long pflags;
unsigned long pcount;
};
int get_pfn(void *vaddr, uint64_t *buf, int pid, int count);
int get_pflags(unsigned long pfn, uint64_t *buf, int count);
int get_pcount(unsigned long pfn, uint64_t *buf, int count);
int kick_hard_offline(unsigned long pfn);
int kick_soft_offline(unsigned long pfn);
void get_pagestat(char *vaddr, struct pagestat *ps);
static int pagemap_fd;
static int kpageflags_fd;
static int kpagecount_fd;
static int hwpoison_inject_fd;
static int soft_offline_fd;
/* pagemap kernel ABI bits */
#define PM_ENTRY_BYTES sizeof(uint64_t)
#define PM_STATUS_BITS 3
#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
#define PM_PSHIFT_BITS 6
#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
#define PM_PRESENT PM_STATUS(4LL)
#define PM_SWAP PM_STATUS(2LL)
static unsigned long do_u64_read(int fd, char *name,
uint64_t *buf,
unsigned long index,
unsigned long count)
{
long bytes;
if (index > ULONG_MAX / 8) {
fprintf(stderr, "index overflow: %lu\n", index);
exit(EXIT_FAILURE);
}
if (lseek(fd, index * 8, SEEK_SET) < 0) {
perror(name);
exit(EXIT_FAILURE);
}
if ((bytes = read(fd, buf, count * 8)) < 0) {
perror(name);
exit(EXIT_FAILURE);
}
if (bytes % 8) {
fprintf(stderr, "partial read: %lu bytes\n", bytes);
exit(EXIT_FAILURE);
}
return bytes / 8;
}
static unsigned long pagemap_read(uint64_t *buf,
unsigned long index,
unsigned long pages) {
return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
}
static unsigned long pagemap_pfn(uint64_t val) {
unsigned long pfn;
if (val & PM_PRESENT)
pfn = PM_PFRAME(val);
else
pfn = 0;
return pfn;
}
int get_pfn(void *vaddr, uint64_t *buf, int pid, int count) {
char filename[128];
uint64_t *tmpbuf = (uint64_t *)malloc(8 * count);
int pages;
unsigned long index = ((unsigned long)vaddr) / getpagesize();
int i;
if (!pid)
pid = getpid();
sprintf(filename, "/proc/%d/pagemap", pid);
if ((pagemap_fd = open(filename, O_RDONLY)) < 0) {
perror(filename);
exit(EXIT_FAILURE);
}
pages = pagemap_read(tmpbuf, index, 1);
for (i = 0; i < pages; i++) {
buf[i] = pagemap_pfn(tmpbuf[i]);
}
close(pagemap_fd);
free(tmpbuf);
return pages;
}
static unsigned long kpageflags_read(uint64_t *buf,
unsigned long index,
unsigned long pages) {
return do_u64_read(kpageflags_fd, "/proc/kpageflags", buf, index, pages);
}
int get_pflags(unsigned long pfn, uint64_t *buf, int count) {
uint64_t *tmpbuf = (uint64_t *)malloc(8 * count);
int pages;
int i;
if ((kpageflags_fd = open("/proc/kpageflags", O_RDONLY)) < 0) {
perror("reading /proc/kpageflags");
exit(EXIT_FAILURE);
}
pages = kpageflags_read(tmpbuf, pfn, 1);
for (i = 0; i < pages; i++) {
buf[i] = tmpbuf[i];
}
close(kpageflags_fd);
free(tmpbuf);
return pages;
}
static unsigned long kpagecount_read(uint64_t *buf,
unsigned long index,
unsigned long pages) {
return do_u64_read(kpagecount_fd, "/proc/kpagecount", buf, index, pages);
}
int get_pcount(unsigned long pfn, uint64_t *buf, int count) {
uint64_t *tmpbuf = (uint64_t *)malloc(8 * count);
int pages;
int i;
if ((kpagecount_fd = open("/proc/kpagecount", O_RDONLY)) < 0) {
perror("reading /proc/kpagecount");
exit(EXIT_FAILURE);
}
pages = kpagecount_read(tmpbuf, pfn, 1);
for (i = 0; i < pages; i++) {
buf[i] = tmpbuf[i];
}
close(kpagecount_fd);
free(tmpbuf);
return pages;
}
int kick_hard_offline(unsigned long pfn) {
int len;
char buf[128];
if ((hwpoison_inject_fd = open("/sys/kernel/debug/hwpoison/corrupt-pfn",
O_WRONLY)) < 0) {
perror("open debugfs:/hwpoison/corrupt-pfn");
return 1;
}
len = sprintf(buf, "0x%lx\n", pfn);
if ((len = write(hwpoison_inject_fd, buf, len)) < 0) {
perror("kick hard offline");
return 1;
}
close(hwpoison_inject_fd);
return 0;
}
int kick_soft_offline(unsigned long pfn) {
int len;
char buf[128];
if ((soft_offline_fd = open("/sys/devices/system/memory/soft_offline_page",
O_WRONLY)) < 0) {
perror("open /sys/devices/system/memory/soft_offline_page");
return 1;
}
len = sprintf(buf, "0x%lx000\n", pfn);
if ((len = write(soft_offline_fd, buf, len)) < 0) {
perror("kick soft offline");
return 1;
}
close(soft_offline_fd);
return 0;
}
void get_pagestat(char *vaddr, struct pagestat *ps) {
get_pfn(vaddr, &ps->pfn, getpid(), 1);
get_pflags(ps->pfn, &ps->pflags, 1);
get_pcount(ps->pfn, &ps->pcount, 1);
printf("pfn 0x%lx, page flags 0x%016lx, page count %d\n",
ps->pfn, ps->pflags, ps->pcount);
}