Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <stdint.h>
3#include <stdbool.h>
4#include <sys/mman.h>
5#include <err.h>
6#include <strings.h> /* ffsl() */
7#include <unistd.h> /* _SC_PAGESIZE */
8#include "../kselftest.h"
9
10#define BIT_ULL(nr) (1ULL << (nr))
11#define PM_SOFT_DIRTY BIT_ULL(55)
12#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
13#define PM_UFFD_WP BIT_ULL(57)
14#define PM_GUARD_REGION BIT_ULL(58)
15#define PM_FILE BIT_ULL(61)
16#define PM_SWAP BIT_ULL(62)
17#define PM_PRESENT BIT_ULL(63)
18
19extern unsigned int __page_size;
20extern unsigned int __page_shift;
21
22static inline unsigned int psize(void)
23{
24 if (!__page_size)
25 __page_size = sysconf(_SC_PAGESIZE);
26 return __page_size;
27}
28
29static inline unsigned int pshift(void)
30{
31 if (!__page_shift)
32 __page_shift = (ffsl(psize()) - 1);
33 return __page_shift;
34}
35
36/*
37 * Plan 9 FS has bugs (at least on QEMU) where certain operations fail with
38 * ENOENT on unlinked files. See
39 * https://gitlab.com/qemu-project/qemu/-/issues/103 for some info about such
40 * bugs. There are rumours of NFS implementations with similar bugs.
41 *
42 * Ideally, tests should just detect filesystems known to have such issues and
43 * bail early. But 9pfs has the additional "feature" that it causes fstatfs to
44 * pass through the f_type field from the host filesystem. To avoid having to
45 * scrape /proc/mounts or some other hackery, tests can call this function when
46 * it seems such a bug might have been encountered.
47 */
48static inline void skip_test_dodgy_fs(const char *op_name)
49{
50 ksft_test_result_skip("%s failed with ENOENT. Filesystem might be buggy (9pfs?)\n", op_name);
51}
52
53uint64_t pagemap_get_entry(int fd, char *start);
54bool pagemap_is_softdirty(int fd, char *start);
55bool pagemap_is_swapped(int fd, char *start);
56bool pagemap_is_populated(int fd, char *start);
57unsigned long pagemap_get_pfn(int fd, char *start);
58void clear_softdirty(void);
59bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
60uint64_t read_pmd_pagesize(void);
61unsigned long rss_anon(void);
62bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
63bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
64bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
65int64_t allocate_transhuge(void *ptr, int pagemap_fd);
66unsigned long default_huge_page_size(void);
67int detect_hugetlb_page_sizes(size_t sizes[], int max);
68
69int uffd_register(int uffd, void *addr, uint64_t len,
70 bool miss, bool wp, bool minor);
71int uffd_unregister(int uffd, void *addr, uint64_t len);
72int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
73 bool miss, bool wp, bool minor, uint64_t *ioctls);
74unsigned long get_free_hugepages(void);
75bool check_vmflag_io(void *addr);
76
77/*
78 * On ppc64 this will only work with radix 2M hugepage size
79 */
80#define HPAGE_SHIFT 21
81#define HPAGE_SIZE (1 << HPAGE_SHIFT)
82
83#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
84#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))