--- /dev/null
+/*
+ * page-types: Tool for querying page flags
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2.
+ *
+ * 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.
+ *
+ * You should find a copy of v2 of the GNU General Public License somewhere on
+ * your Linux system; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Copyright (C) 2009 Intel corporation
+ *
+ * Authors: Wu Fengguang <fengguang.wu@intel.com>
+ */
+
+#define _FILE_OFFSET_BITS 64
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <getopt.h>
+#include <limits.h>
+#include <assert.h>
+#include <ftw.h>
+#include <time.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <sys/mount.h>
+#include <sys/statfs.h>
+#include <sys/mman.h>
+#include "../../include/uapi/linux/magic.h"
+#include "../../include/uapi/linux/kernel-page-flags.h"
+#include <api/fs/debugfs.h>
+
+#ifndef MAX_PATH
+# define MAX_PATH 256
+#endif
+
+#ifndef STR
+# define _STR(x) #x
+# define STR(x) _STR(x)
+#endif
+
+/*
+ * 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) (((uint64_t) (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_SOFT_DIRTY (1LL)
+#define PM_PRESENT PM_STATUS(4LL)
+#define PM_SWAP PM_STATUS(2LL)
+#define PM_SOFT_DIRTY __PM_PSHIFT(__PM_SOFT_DIRTY)
+
+
+/*
+ * kernel page flags
+ */
+
+#define KPF_BYTES 8
+#define PROC_KPAGEFLAGS "/proc/kpageflags"
+
+/* [32-] kernel hacking assistances */
+#define KPF_RESERVED 32
+#define KPF_MLOCKED 33
+#define KPF_MAPPEDTODISK 34
+#define KPF_PRIVATE 35
+#define KPF_PRIVATE_2 36
+#define KPF_OWNER_PRIVATE 37
+#define KPF_ARCH 38
+#define KPF_UNCACHED 39
+#define KPF_SOFTDIRTY 40
+
+/* [48-] take some arbitrary free slots for expanding overloaded flags
+ * not part of kernel API
+ */
+#define KPF_READAHEAD 48
+#define KPF_SLOB_FREE 49
+#define KPF_SLUB_FROZEN 50
+#define KPF_SLUB_DEBUG 51
+
+#define KPF_ALL_BITS ((uint64_t)~0ULL)
+#define KPF_HACKERS_BITS (0xffffULL << 32)
+#define KPF_OVERLOADED_BITS (0xffffULL << 48)
+#define BIT(name) (1ULL << KPF_##name)
+#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
+
+static const char * const page_flag_names[] = {
+ [KPF_LOCKED] = "L:locked",
+ [KPF_ERROR] = "E:error",
+ [KPF_REFERENCED] = "R:referenced",
+ [KPF_UPTODATE] = "U:uptodate",
+ [KPF_DIRTY] = "D:dirty",
+ [KPF_LRU] = "l:lru",
+ [KPF_ACTIVE] = "A:active",
+ [KPF_SLAB] = "S:slab",
+ [KPF_WRITEBACK] = "W:writeback",
+ [KPF_RECLAIM] = "I:reclaim",
+ [KPF_BUDDY] = "B:buddy",
+
+ [KPF_MMAP] = "M:mmap",
+ [KPF_ANON] = "a:anonymous",
+ [KPF_SWAPCACHE] = "s:swapcache",
+ [KPF_SWAPBACKED] = "b:swapbacked",
+ [KPF_COMPOUND_HEAD] = "H:compound_head",
+ [KPF_COMPOUND_TAIL] = "T:compound_tail",
+ [KPF_HUGE] = "G:huge",
+ [KPF_UNEVICTABLE] = "u:unevictable",
+ [KPF_HWPOISON] = "X:hwpoison",
+ [KPF_NOPAGE] = "n:nopage",
+ [KPF_KSM] = "x:ksm",
+ [KPF_THP] = "t:thp",
+ [KPF_BALLOON] = "o:balloon",
+ [KPF_ZERO_PAGE] = "z:zero_page",
+
+ [KPF_RESERVED] = "r:reserved",
+ [KPF_MLOCKED] = "m:mlocked",
+ [KPF_MAPPEDTODISK] = "d:mappedtodisk",
+ [KPF_PRIVATE] = "P:private",
+ [KPF_PRIVATE_2] = "p:private_2",
+ [KPF_OWNER_PRIVATE] = "O:owner_private",
+ [KPF_ARCH] = "h:arch",
+ [KPF_UNCACHED] = "c:uncached",
+ [KPF_SOFTDIRTY] = "f:softdirty",
+
+ [KPF_READAHEAD] = "I:readahead",
+ [KPF_SLOB_FREE] = "P:slob_free",
+ [KPF_SLUB_FROZEN] = "A:slub_frozen",
+ [KPF_SLUB_DEBUG] = "E:slub_debug",
+};
+
+
+static const char * const debugfs_known_mountpoints[] = {
+ "/sys/kernel/debug",
+ "/debug",
+ 0,
+};
+
+/*
+ * data structures
+ */
+
+static int opt_raw; /* for kernel developers */
+static int opt_list; /* list pages (in ranges) */
+static int opt_no_summary; /* don't show summary */
+static pid_t opt_pid; /* process to walk */
+const char * opt_file;
+
+#define MAX_ADDR_RANGES 1024
+static int nr_addr_ranges;
+static unsigned long opt_offset[MAX_ADDR_RANGES];
+static unsigned long opt_size[MAX_ADDR_RANGES];
+
+#define MAX_VMAS 10240
+static int nr_vmas;
+static unsigned long pg_start[MAX_VMAS];
+static unsigned long pg_end[MAX_VMAS];
+
+#define MAX_BIT_FILTERS 64
+static int nr_bit_filters;
+static uint64_t opt_mask[MAX_BIT_FILTERS];
+static uint64_t opt_bits[MAX_BIT_FILTERS];
+
+static int page_size;
+
+static int pagemap_fd;
+static int kpageflags_fd;
+
+static int opt_hwpoison;
+static int opt_unpoison;
+
+static char *hwpoison_debug_fs;
+static int hwpoison_inject_fd;
+static int hwpoison_forget_fd;
+
+#define HASH_SHIFT 13
+#define HASH_SIZE (1 << HASH_SHIFT)
+#define HASH_MASK (HASH_SIZE - 1)
+#define HASH_KEY(flags) (flags & HASH_MASK)
+
+static unsigned long total_pages;
+static unsigned long nr_pages[HASH_SIZE];
+static uint64_t page_flags[HASH_SIZE];
+
+
+/*
+ * helper functions
+ */
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+#define min_t(type, x, y) ({ \
+ type __min1 = (x); \
+ type __min2 = (y); \
+ __min1 < __min2 ? __min1 : __min2; })
+
+#define max_t(type, x, y) ({ \
+ type __max1 = (x); \
+ type __max2 = (y); \
+ __max1 > __max2 ? __max1 : __max2; })
+
+static unsigned long pages2mb(unsigned long pages)
+{
+ return (pages * page_size) >> 20;
+}
+
+static void fatal(const char *x, ...)
+{
+ va_list ap;
+
+ va_start(ap, x);
+ vfprintf(stderr, x, ap);
+ va_end(ap);
+ exit(EXIT_FAILURE);
+}
+
+static int checked_open(const char *pathname, int flags)
+{
+ int fd = open(pathname, flags);
+
+ if (fd < 0) {
+ perror(pathname);
+ exit(EXIT_FAILURE);
+ }
+
+ return fd;
+}
+
+/*
+ * pagemap/kpageflags routines
+ */
+
+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)
+ fatal("index overflow: %lu\n", index);
+
+ bytes = pread(fd, buf, count * 8, (off_t)index * 8);
+ if (bytes < 0) {
+ perror(name);
+ exit(EXIT_FAILURE);
+ }
+ if (bytes % 8)
+ fatal("partial read: %lu bytes\n", bytes);
+
+ return bytes / 8;
+}
+
+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);
+}
+
+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;
+}
+
+
+/*
+ * page flag names
+ */
+
+static char *page_flag_name(uint64_t flags)
+{
+ static char buf[65];
+ int present;
+ size_t i, j;
+
+ for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
+ present = (flags >> i) & 1;
+ if (!page_flag_names[i]) {
+ if (present)
+ fatal("unknown flag bit %d\n", i);
+ continue;
+ }
+ buf[j++] = present ? page_flag_names[i][0] : '_';
+ }
+
+ return buf;
+}
+
+static char *page_flag_longname(uint64_t flags)
+{
+ static char buf[1024];
+ size_t i, n;
+
+ for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
+ if (!page_flag_names[i])
+ continue;
+ if ((flags >> i) & 1)
+ n += snprintf(buf + n, sizeof(buf) - n, "%s,",
+ page_flag_names[i] + 2);
+ }
+ if (n)
+ n--;
+ buf[n] = '\0';
+
+ return buf;
+}
+
+
+/*
+ * page list and summary
+ */
+
+static void show_page_range(unsigned long voffset, unsigned long offset,
+ unsigned long size, uint64_t flags)
+{
+ static uint64_t flags0;
+ static unsigned long voff;
+ static unsigned long index;
+ static unsigned long count;
+
+ if (flags == flags0 && offset == index + count &&
+ size && voffset == voff + count) {
+ count += size;
+ return;
+ }
+
+ if (count) {
+ if (opt_pid)
+ printf("%lx\t", voff);
+ if (opt_file)
+ printf("%lu\t", voff);
+ printf("%lx\t%lx\t%s\n",
+ index, count, page_flag_name(flags0));
+ }
+
+ flags0 = flags;
+ index = offset;
+ voff = voffset;
+ count = size;
+}
+
+static void flush_page_range(void)
+{
+ show_page_range(0, 0, 0, 0);
+}
+
+static void show_page(unsigned long voffset,
+ unsigned long offset, uint64_t flags)
+{
+ if (opt_pid)
+ printf("%lx\t", voffset);
+ if (opt_file)
+ printf("%lu\t", voffset);
+ printf("%lx\t%s\n", offset, page_flag_name(flags));
+}
+
+static void show_summary(void)
+{
+ size_t i;
+
+ printf(" flags\tpage-count MB"
+ " symbolic-flags\t\t\tlong-symbolic-flags\n");
+
+ for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
+ if (nr_pages[i])
+ printf("0x%016llx\t%10lu %8lu %s\t%s\n",
+ (unsigned long long)page_flags[i],
+ nr_pages[i],
+ pages2mb(nr_pages[i]),
+ page_flag_name(page_flags[i]),
+ page_flag_longname(page_flags[i]));
+ }
+
+ printf(" total\t%10lu %8lu\n",
+ total_pages, pages2mb(total_pages));
+}
+
+
+/*
+ * page flag filters
+ */
+
+static int bit_mask_ok(uint64_t flags)
+{
+ int i;
+
+ for (i = 0; i < nr_bit_filters; i++) {
+ if (opt_bits[i] == KPF_ALL_BITS) {
+ if ((flags & opt_mask[i]) == 0)
+ return 0;
+ } else {
+ if ((flags & opt_mask[i]) != opt_bits[i])
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
+{
+ /* SLOB/SLUB overload several page flags */
+ if (flags & BIT(SLAB)) {
+ if (flags & BIT(PRIVATE))
+ flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
+ if (flags & BIT(ACTIVE))
+ flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
+ if (flags & BIT(ERROR))
+ flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
+ }
+
+ /* PG_reclaim is overloaded as PG_readahead in the read path */
+ if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
+ flags ^= BIT(RECLAIM) | BIT(READAHEAD);
+
+ if (pme & PM_SOFT_DIRTY)
+ flags |= BIT(SOFTDIRTY);
+
+ return flags;
+}
+
+static uint64_t well_known_flags(uint64_t flags)
+{
+ /* hide flags intended only for kernel hacker */
+ flags &= ~KPF_HACKERS_BITS;
+
+ /* hide non-hugeTLB compound pages */
+ if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
+ flags &= ~BITS_COMPOUND;
+
+ return flags;
+}
+
+static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
+{
+ if (opt_raw)
+ flags = expand_overloaded_flags(flags, pme);
+ else
+ flags = well_known_flags(flags);
+
+ return flags;
+}
+
+/*
+ * page actions
+ */
+
+static void prepare_hwpoison_fd(void)
+{
+ char buf[MAX_PATH + 1];
+
+ hwpoison_debug_fs = debugfs_mount(NULL);
+ if (!hwpoison_debug_fs) {
+ perror("mount debugfs");
+ exit(EXIT_FAILURE);
+ }
+
+ if (opt_hwpoison && !hwpoison_inject_fd) {
+ snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
+ hwpoison_debug_fs);
+ hwpoison_inject_fd = checked_open(buf, O_WRONLY);
+ }
+
+ if (opt_unpoison && !hwpoison_forget_fd) {
+ snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
+ hwpoison_debug_fs);
+ hwpoison_forget_fd = checked_open(buf, O_WRONLY);
+ }
+}
+
+static int hwpoison_page(unsigned long offset)
+{
+ char buf[100];
+ int len;
+
+ len = sprintf(buf, "0x%lx\n", offset);
+ len = write(hwpoison_inject_fd, buf, len);
+ if (len < 0) {
+ perror("hwpoison inject");
+ return len;
+ }
+ return 0;
+}
+
+static int unpoison_page(unsigned long offset)
+{
+ char buf[100];
+ int len;
+
+ len = sprintf(buf, "0x%lx\n", offset);
+ len = write(hwpoison_forget_fd, buf, len);
+ if (len < 0) {
+ perror("hwpoison forget");
+ return len;
+ }
+ return 0;
+}
+
+/*
+ * page frame walker
+ */
+
+static size_t hash_slot(uint64_t flags)
+{
+ size_t k = HASH_KEY(flags);
+ size_t i;
+
+ /* Explicitly reserve slot 0 for flags 0: the following logic
+ * cannot distinguish an unoccupied slot from slot (flags==0).
+ */
+ if (flags == 0)
+ return 0;
+
+ /* search through the remaining (HASH_SIZE-1) slots */
+ for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
+ if (!k || k >= ARRAY_SIZE(page_flags))
+ k = 1;
+ if (page_flags[k] == 0) {
+ page_flags[k] = flags;
+ return k;
+ }
+ if (page_flags[k] == flags)
+ return k;
+ }
+
+ fatal("hash table full: bump up HASH_SHIFT?\n");
+ exit(EXIT_FAILURE);
+}
+
+static void add_page(unsigned long voffset,
+ unsigned long offset, uint64_t flags, uint64_t pme)
+{
+ flags = kpageflags_flags(flags, pme);
+
+ if (!bit_mask_ok(flags))
+ return;
+
+ if (opt_hwpoison)
+ hwpoison_page(offset);
+ if (opt_unpoison)
+ unpoison_page(offset);
+
+ if (opt_list == 1)
+ show_page_range(voffset, offset, 1, flags);
+ else if (opt_list == 2)
+ show_page(voffset, offset, flags);
+
+ nr_pages[hash_slot(flags)]++;
+ total_pages++;
+}
+
+#define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
+static void walk_pfn(unsigned long voffset,
+ unsigned long index,
+ unsigned long count,
+ uint64_t pme)
+{
+ uint64_t buf[KPAGEFLAGS_BATCH];
+ unsigned long batch;
+ unsigned long pages;
+ unsigned long i;
+
+ while (count) {
+ batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
+ pages = kpageflags_read(buf, index, batch);
+ if (pages == 0)
+ break;
+
+ for (i = 0; i < pages; i++)
+ add_page(voffset + i, index + i, buf[i], pme);
+
+ index += pages;
+ count -= pages;
+ }
+}
+
+#define PAGEMAP_BATCH (64 << 10)
+static void walk_vma(unsigned long index, unsigned long count)
+{
+ uint64_t buf[PAGEMAP_BATCH];
+ unsigned long batch;
+ unsigned long pages;
+ unsigned long pfn;
+ unsigned long i;
+
+ while (count) {
+ batch = min_t(unsigned long, count, PAGEMAP_BATCH);
+ pages = pagemap_read(buf, index, batch);
+ if (pages == 0)
+ break;
+
+ for (i = 0; i < pages; i++) {
+ pfn = pagemap_pfn(buf[i]);
+ if (pfn)
+ walk_pfn(index + i, pfn, 1, buf[i]);
+ }
+
+ index += pages;
+ count -= pages;
+ }
+}
+
+static void walk_task(unsigned long index, unsigned long count)
+{
+ const unsigned long end = index + count;
+ unsigned long start;
+ int i = 0;
+
+ while (index < end) {
+
+ while (pg_end[i] <= index)
+ if (++i >= nr_vmas)
+ return;
+ if (pg_start[i] >= end)
+ return;
+
+ start = max_t(unsigned long, pg_start[i], index);
+ index = min_t(unsigned long, pg_end[i], end);
+
+ assert(start < index);
+ walk_vma(start, index - start);
+ }
+}
+
+static void add_addr_range(unsigned long offset, unsigned long size)
+{
+ if (nr_addr_ranges >= MAX_ADDR_RANGES)
+ fatal("too many addr ranges\n");
+
+ opt_offset[nr_addr_ranges] = offset;
+ opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
+ nr_addr_ranges++;
+}
+
+static void walk_addr_ranges(void)
+{
+ int i;
+
+ kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
+
+ if (!nr_addr_ranges)
+ add_addr_range(0, ULONG_MAX);
+
+ for (i = 0; i < nr_addr_ranges; i++)
+ if (!opt_pid)
+ walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0);
+ else
+ walk_task(opt_offset[i], opt_size[i]);
+
+ close(kpageflags_fd);
+}
+
+
+/*
+ * user interface
+ */
+
+static const char *page_flag_type(uint64_t flag)
+{
+ if (flag & KPF_HACKERS_BITS)
+ return "(r)";
+ if (flag & KPF_OVERLOADED_BITS)
+ return "(o)";
+ return " ";
+}
+
+static void usage(void)
+{
+ size_t i, j;
+
+ printf(
+"page-types [options]\n"
+" -r|--raw Raw mode, for kernel developers\n"
+" -d|--describe flags Describe flags\n"
+" -a|--addr addr-spec Walk a range of pages\n"
+" -b|--bits bits-spec Walk pages with specified bits\n"
+" -p|--pid pid Walk process address space\n"
+" -f|--file filename Walk file address space\n"
+" -l|--list Show page details in ranges\n"
+" -L|--list-each Show page details one by one\n"
+" -N|--no-summary Don't show summary info\n"
+" -X|--hwpoison hwpoison pages\n"
+" -x|--unpoison unpoison pages\n"
+" -h|--help Show this usage message\n"
+"flags:\n"
+" 0x10 bitfield format, e.g.\n"
+" anon bit-name, e.g.\n"
+" 0x10,anon comma-separated list, e.g.\n"
+"addr-spec:\n"
+" N one page at offset N (unit: pages)\n"
+" N+M pages range from N to N+M-1\n"
+" N,M pages range from N to M-1\n"
+" N, pages range from N to end\n"
+" ,M pages range from 0 to M-1\n"
+"bits-spec:\n"
+" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
+" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
+" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
+" =bit1,bit2 flags == (bit1|bit2)\n"
+"bit-names:\n"
+ );
+
+ for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
+ if (!page_flag_names[i])
+ continue;
+ printf("%16s%s", page_flag_names[i] + 2,
+ page_flag_type(1ULL << i));
+ if (++j > 3) {
+ j = 0;
+ putchar('\n');
+ }
+ }
+ printf("\n "
+ "(r) raw mode bits (o) overloaded bits\n");
+}
+
+static unsigned long long parse_number(const char *str)
+{
+ unsigned long long n;
+
+ n = strtoll(str, NULL, 0);
+
+ if (n == 0 && str[0] != '0')
+ fatal("invalid name or number: %s\n", str);
+
+ return n;
+}
+
+static void parse_pid(const char *str)
+{
+ FILE *file;
+ char buf[5000];
+
+ opt_pid = parse_number(str);
+
+ sprintf(buf, "/proc/%d/pagemap", opt_pid);
+ pagemap_fd = checked_open(buf, O_RDONLY);
+
+ sprintf(buf, "/proc/%d/maps", opt_pid);
+ file = fopen(buf, "r");
+ if (!file) {
+ perror(buf);
+ exit(EXIT_FAILURE);
+ }
+
+ while (fgets(buf, sizeof(buf), file) != NULL) {
+ unsigned long vm_start;
+ unsigned long vm_end;
+ unsigned long long pgoff;
+ int major, minor;
+ char r, w, x, s;
+ unsigned long ino;
+ int n;
+
+ n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
+ &vm_start,
+ &vm_end,
+ &r, &w, &x, &s,
+ &pgoff,
+ &major, &minor,
+ &ino);
+ if (n < 10) {
+ fprintf(stderr, "unexpected line: %s\n", buf);
+ continue;
+ }
+ pg_start[nr_vmas] = vm_start / page_size;
+ pg_end[nr_vmas] = vm_end / page_size;
+ if (++nr_vmas >= MAX_VMAS) {
+ fprintf(stderr, "too many VMAs\n");
+ break;
+ }
+ }
+ fclose(file);
+}
+
+static void show_file(const char *name, const struct stat *st)
+{
+ unsigned long long size = st->st_size;
+ char atime[64], mtime[64];
+ long now = time(NULL);
+
+ printf("%s\tInode: %u\tSize: %llu (%llu pages)\n",
+ name, (unsigned)st->st_ino,
+ size, (size + page_size - 1) / page_size);
+
+ strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime));
+ strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime));
+
+ printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n",
+ mtime, now - st->st_mtime,
+ atime, now - st->st_atime);
+}
+
+static sigjmp_buf sigbus_jmp;
+
+static void * volatile sigbus_addr;
+
+static void sigbus_handler(int sig, siginfo_t *info, void *ucontex)
+{
+ (void)sig;
+ (void)ucontex;
+ sigbus_addr = info ? info->si_addr : NULL;
+ siglongjmp(sigbus_jmp, 1);
+}
+
+static struct sigaction sigbus_action = {
+ .sa_sigaction = sigbus_handler,
+ .sa_flags = SA_SIGINFO,
+};
+
+static void walk_file(const char *name, const struct stat *st)
+{
+ uint8_t vec[PAGEMAP_BATCH];
+ uint64_t buf[PAGEMAP_BATCH], flags;
+ unsigned long nr_pages, pfn, i;
+ off_t off, end = st->st_size;
+ int fd;
+ ssize_t len;
+ void *ptr;
+ int first = 1;
+
+ fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
+
+ for (off = 0; off < end; off += len) {
+ nr_pages = (end - off + page_size - 1) / page_size;
+ if (nr_pages > PAGEMAP_BATCH)
+ nr_pages = PAGEMAP_BATCH;
+ len = nr_pages * page_size;
+
+ ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off);
+ if (ptr == MAP_FAILED)
+ fatal("mmap failed: %s", name);
+
+ /* determine cached pages */
+ if (mincore(ptr, len, vec))
+ fatal("mincore failed: %s", name);
+
+ /* turn off readahead */
+ if (madvise(ptr, len, MADV_RANDOM))
+ fatal("madvice failed: %s", name);
+
+ if (sigsetjmp(sigbus_jmp, 1)) {
+ end = off + sigbus_addr ? sigbus_addr - ptr : 0;
+ fprintf(stderr, "got sigbus at offset %lld: %s\n",
+ (long long)end, name);
+ goto got_sigbus;
+ }
+
+ /* populate ptes */
+ for (i = 0; i < nr_pages ; i++) {
+ if (vec[i] & 1)
+ (void)*(volatile int *)(ptr + i * page_size);
+ }
+got_sigbus:
+
+ /* turn off harvesting reference bits */
+ if (madvise(ptr, len, MADV_SEQUENTIAL))
+ fatal("madvice failed: %s", name);
+
+ if (pagemap_read(buf, (unsigned long)ptr / page_size,
+ nr_pages) != nr_pages)
+ fatal("cannot read pagemap");
+
+ munmap(ptr, len);
+
+ for (i = 0; i < nr_pages; i++) {
+ pfn = pagemap_pfn(buf[i]);
+ if (!pfn)
+ continue;
+ if (!kpageflags_read(&flags, pfn, 1))
+ continue;
+ if (first && opt_list) {
+ first = 0;
+ flush_page_range();
+ show_file(name, st);
+ }
+ add_page(off / page_size + i, pfn, flags, buf[i]);
+ }
+ }
+
+ close(fd);
+}
+
+int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f)
+{
+ (void)f;
+ switch (type) {
+ case FTW_F:
+ if (S_ISREG(st->st_mode))
+ walk_file(name, st);
+ break;
+ case FTW_DNR:
+ fprintf(stderr, "cannot read dir: %s\n", name);
+ break;
+ }
+ return 0;
+}
+
+static void walk_page_cache(void)
+{
+ struct stat st;
+
+ kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
+ pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
+ sigaction(SIGBUS, &sigbus_action, NULL);
+
+ if (stat(opt_file, &st))
+ fatal("stat failed: %s\n", opt_file);
+
+ if (S_ISREG(st.st_mode)) {
+ walk_file(opt_file, &st);
+ } else if (S_ISDIR(st.st_mode)) {
+ /* do not follow symlinks and mountpoints */
+ if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0)
+ fatal("nftw failed: %s\n", opt_file);
+ } else
+ fatal("unhandled file type: %s\n", opt_file);
+
+ close(kpageflags_fd);
+ close(pagemap_fd);
+ signal(SIGBUS, SIG_DFL);
+}
+
+static void parse_file(const char *name)
+{
+ opt_file = name;
+}
+
+static void parse_addr_range(const char *optarg)
+{
+ unsigned long offset;
+ unsigned long size;
+ char *p;
+
+ p = strchr(optarg, ',');
+ if (!p)
+ p = strchr(optarg, '+');
+
+ if (p == optarg) {
+ offset = 0;
+ size = parse_number(p + 1);
+ } else if (p) {
+ offset = parse_number(optarg);
+ if (p[1] == '\0')
+ size = ULONG_MAX;
+ else {
+ size = parse_number(p + 1);
+ if (*p == ',') {
+ if (size < offset)
+ fatal("invalid range: %lu,%lu\n",
+ offset, size);
+ size -= offset;
+ }
+ }
+ } else {
+ offset = parse_number(optarg);
+ size = 1;
+ }
+
+ add_addr_range(offset, size);
+}
+
+static void add_bits_filter(uint64_t mask, uint64_t bits)
+{
+ if (nr_bit_filters >= MAX_BIT_FILTERS)
+ fatal("too much bit filters\n");
+
+ opt_mask[nr_bit_filters] = mask;
+ opt_bits[nr_bit_filters] = bits;
+ nr_bit_filters++;
+}
+
+static uint64_t parse_flag_name(const char *str, int len)
+{
+ size_t i;
+
+ if (!*str || !len)
+ return 0;
+
+ if (len <= 8 && !strncmp(str, "compound", len))
+ return BITS_COMPOUND;
+
+ for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
+ if (!page_flag_names[i])
+ continue;
+ if (!strncmp(str, page_flag_names[i] + 2, len))
+ return 1ULL << i;
+ }
+
+ return parse_number(str);
+}
+
+static uint64_t parse_flag_names(const char *str, int all)
+{
+ const char *p = str;
+ uint64_t flags = 0;
+
+ while (1) {
+ if (*p == ',' || *p == '=' || *p == '\0') {
+ if ((*str != '~') || (*str == '~' && all && *++str))
+ flags |= parse_flag_name(str, p - str);
+ if (*p != ',')
+ break;
+ str = p + 1;
+ }
+ p++;
+ }
+
+ return flags;
+}
+
+static void parse_bits_mask(const char *optarg)
+{
+ uint64_t mask;
+ uint64_t bits;
+ const char *p;
+
+ p = strchr(optarg, '=');
+ if (p == optarg) {
+ mask = KPF_ALL_BITS;
+ bits = parse_flag_names(p + 1, 0);
+ } else if (p) {
+ mask = parse_flag_names(optarg, 0);
+ bits = parse_flag_names(p + 1, 0);
+ } else if (strchr(optarg, '~')) {
+ mask = parse_flag_names(optarg, 1);
+ bits = parse_flag_names(optarg, 0);
+ } else {
+ mask = parse_flag_names(optarg, 0);
+ bits = KPF_ALL_BITS;
+ }
+
+ add_bits_filter(mask, bits);
+}
+
+static void describe_flags(const char *optarg)
+{
+ uint64_t flags = parse_flag_names(optarg, 0);
+
+ printf("0x%016llx\t%s\t%s\n",
+ (unsigned long long)flags,
+ page_flag_name(flags),
+ page_flag_longname(flags));
+}
+
+static const struct option opts[] = {
+ { "raw" , 0, NULL, 'r' },
+ { "pid" , 1, NULL, 'p' },
+ { "file" , 1, NULL, 'f' },
+ { "addr" , 1, NULL, 'a' },
+ { "bits" , 1, NULL, 'b' },
+ { "describe" , 1, NULL, 'd' },
+ { "list" , 0, NULL, 'l' },
+ { "list-each" , 0, NULL, 'L' },
+ { "no-summary", 0, NULL, 'N' },
+ { "hwpoison" , 0, NULL, 'X' },
+ { "unpoison" , 0, NULL, 'x' },
+ { "help" , 0, NULL, 'h' },
+ { NULL , 0, NULL, 0 }
+};
+
+int main(int argc, char *argv[])
+{
+ int c;
+
+ page_size = getpagesize();
+
+ while ((c = getopt_long(argc, argv,
+ "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
+ switch (c) {
+ case 'r':
+ opt_raw = 1;
+ break;
+ case 'p':
+ parse_pid(optarg);
+ break;
+ case 'f':
+ parse_file(optarg);
+ break;
+ case 'a':
+ parse_addr_range(optarg);
+ break;
+ case 'b':
+ parse_bits_mask(optarg);
+ break;
+ case 'd':
+ describe_flags(optarg);
+ exit(0);
+ case 'l':
+ opt_list = 1;
+ break;
+ case 'L':
+ opt_list = 2;
+ break;
+ case 'N':
+ opt_no_summary = 1;
+ break;
+ case 'X':
+ opt_hwpoison = 1;
+ prepare_hwpoison_fd();
+ break;
+ case 'x':
+ opt_unpoison = 1;
+ prepare_hwpoison_fd();
+ break;
+ case 'h':
+ usage();
+ exit(0);
+ default:
+ usage();
+ exit(1);
+ }
+ }
+
+ if (opt_list && opt_pid)
+ printf("voffset\t");
+ if (opt_list && opt_file)
+ printf("foffset\t");
+ if (opt_list == 1)
+ printf("offset\tlen\tflags\n");
+ if (opt_list == 2)
+ printf("offset\tflags\n");
+
+ if (opt_file)
+ walk_page_cache();
+ else
+ walk_addr_ranges();
+
+ if (opt_list == 1)
+ flush_page_range();
+
+ if (opt_no_summary)
+ return 0;
+
+ if (opt_list)
+ printf("\n\n");
+
+ show_summary();
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff