Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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 <stdarg.h>
7#include <strings.h> /* ffsl() */
8#include <unistd.h> /* _SC_PAGESIZE */
9#include "kselftest.h"
10#include <linux/fs.h>
11
12#define BIT_ULL(nr) (1ULL << (nr))
13#define PM_SOFT_DIRTY BIT_ULL(55)
14#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
15#define PM_UFFD_WP BIT_ULL(57)
16#define PM_GUARD_REGION BIT_ULL(58)
17#define PM_FILE BIT_ULL(61)
18#define PM_SWAP BIT_ULL(62)
19#define PM_PRESENT BIT_ULL(63)
20
21#define KPF_COMPOUND_HEAD BIT_ULL(15)
22#define KPF_COMPOUND_TAIL BIT_ULL(16)
23#define KPF_HWPOISON BIT_ULL(19)
24#define KPF_THP BIT_ULL(22)
25/*
26 * Ignore the checkpatch warning, we must read from x but don't want to do
27 * anything with it in order to trigger a read page fault. We therefore must use
28 * volatile to stop the compiler from optimising this away.
29 */
30#define FORCE_READ(x) (*(const volatile typeof(x) *)&(x))
31
32extern unsigned int __page_size;
33extern unsigned int __page_shift;
34
35/*
36 * Represents an open fd and PROCMAP_QUERY state for binary (via ioctl)
37 * /proc/$pid/[s]maps lookup.
38 */
39struct procmap_fd {
40 int fd;
41 struct procmap_query query;
42};
43
44static inline unsigned int psize(void)
45{
46 if (!__page_size)
47 __page_size = sysconf(_SC_PAGESIZE);
48 return __page_size;
49}
50
51static inline unsigned int pshift(void)
52{
53 if (!__page_shift)
54 __page_shift = (ffsl(psize()) - 1);
55 return __page_shift;
56}
57
58static inline void force_read_pages(char *addr, unsigned int nr_pages,
59 size_t pagesize)
60{
61 for (unsigned int i = 0; i < nr_pages; i++)
62 FORCE_READ(addr[i * pagesize]);
63}
64
65bool detect_huge_zeropage(void);
66
67/*
68 * Plan 9 FS has bugs (at least on QEMU) where certain operations fail with
69 * ENOENT on unlinked files. See
70 * https://gitlab.com/qemu-project/qemu/-/issues/103 for some info about such
71 * bugs. There are rumours of NFS implementations with similar bugs.
72 *
73 * Ideally, tests should just detect filesystems known to have such issues and
74 * bail early. But 9pfs has the additional "feature" that it causes fstatfs to
75 * pass through the f_type field from the host filesystem. To avoid having to
76 * scrape /proc/mounts or some other hackery, tests can call this function when
77 * it seems such a bug might have been encountered.
78 */
79static inline void skip_test_dodgy_fs(const char *op_name)
80{
81 ksft_test_result_skip("%s failed with ENOENT. Filesystem might be buggy (9pfs?)\n", op_name);
82}
83
84uint64_t pagemap_get_entry(int fd, char *start);
85bool pagemap_is_softdirty(int fd, char *start);
86bool pagemap_is_swapped(int fd, char *start);
87bool pagemap_is_populated(int fd, char *start);
88unsigned long pagemap_get_pfn(int fd, char *start);
89void clear_softdirty(void);
90bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
91uint64_t read_pmd_pagesize(void);
92unsigned long rss_anon(void);
93bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
94bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
95bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
96int64_t allocate_transhuge(void *ptr, int pagemap_fd);
97unsigned long default_huge_page_size(void);
98int detect_hugetlb_page_sizes(size_t sizes[], int max);
99int pageflags_get(unsigned long pfn, int kpageflags_fd, uint64_t *flags);
100
101int uffd_register(int uffd, void *addr, uint64_t len,
102 bool miss, bool wp, bool minor);
103int uffd_unregister(int uffd, void *addr, uint64_t len);
104int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
105 bool miss, bool wp, bool minor, uint64_t *ioctls);
106unsigned long get_free_hugepages(void);
107bool check_vmflag_io(void *addr);
108bool check_vmflag_pfnmap(void *addr);
109bool check_vmflag_guard(void *addr);
110int open_procmap(pid_t pid, struct procmap_fd *procmap_out);
111int query_procmap(struct procmap_fd *procmap);
112bool find_vma_procmap(struct procmap_fd *procmap, void *address);
113int close_procmap(struct procmap_fd *procmap);
114int write_sysfs(const char *file_path, unsigned long val);
115int read_sysfs(const char *file_path, unsigned long *val);
116bool softdirty_supported(void);
117
118static inline int open_self_procmap(struct procmap_fd *procmap_out)
119{
120 pid_t pid = getpid();
121
122 return open_procmap(pid, procmap_out);
123}
124
125/* These helpers need to be inline to match the kselftest.h idiom. */
126static char test_name[1024];
127
128static inline void log_test_start(const char *name, ...)
129{
130 va_list args;
131 va_start(args, name);
132
133 vsnprintf(test_name, sizeof(test_name), name, args);
134 ksft_print_msg("[RUN] %s\n", test_name);
135
136 va_end(args);
137}
138
139static inline void log_test_result(int result)
140{
141 ksft_test_result_report(result, "%s\n", test_name);
142}
143
144static inline int sz2ord(size_t size, size_t pagesize)
145{
146 return __builtin_ctzll(size / pagesize);
147}
148
149void *sys_mremap(void *old_address, unsigned long old_size,
150 unsigned long new_size, int flags, void *new_address);
151
152long ksm_get_self_zero_pages(void);
153long ksm_get_self_merging_pages(void);
154long ksm_get_full_scans(void);
155int ksm_use_zero_pages(void);
156int ksm_start(void);
157int ksm_stop(void);
158int get_hardware_corrupted_size(unsigned long *val);
159int unpoison_memory(unsigned long pfn);
160
161/*
162 * On ppc64 this will only work with radix 2M hugepage size
163 */
164#define HPAGE_SHIFT 21
165#define HPAGE_SIZE (1 << HPAGE_SHIFT)
166
167#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
168#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
169
170void write_file(const char *path, const char *buf, size_t buflen);