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 extern unsigned int __page_size;
22 extern unsigned int __page_shift;
23
24 /*
25 * Represents an open fd and PROCMAP_QUERY state for binary (via ioctl)
26 * /proc/$pid/[s]maps lookup.
27 */
28 struct procmap_fd {
29 int fd;
30 struct procmap_query query;
31 };
32
psize(void)33 static inline unsigned int psize(void)
34 {
35 if (!__page_size)
36 __page_size = sysconf(_SC_PAGESIZE);
37 return __page_size;
38 }
39
pshift(void)40 static inline unsigned int pshift(void)
41 {
42 if (!__page_shift)
43 __page_shift = (ffsl(psize()) - 1);
44 return __page_shift;
45 }
46
47 /*
48 * Plan 9 FS has bugs (at least on QEMU) where certain operations fail with
49 * ENOENT on unlinked files. See
50 * https://gitlab.com/qemu-project/qemu/-/issues/103 for some info about such
51 * bugs. There are rumours of NFS implementations with similar bugs.
52 *
53 * Ideally, tests should just detect filesystems known to have such issues and
54 * bail early. But 9pfs has the additional "feature" that it causes fstatfs to
55 * pass through the f_type field from the host filesystem. To avoid having to
56 * scrape /proc/mounts or some other hackery, tests can call this function when
57 * it seems such a bug might have been encountered.
58 */
skip_test_dodgy_fs(const char * op_name)59 static inline void skip_test_dodgy_fs(const char *op_name)
60 {
61 ksft_test_result_skip("%s failed with ENOENT. Filesystem might be buggy (9pfs?)\n", op_name);
62 }
63
64 uint64_t pagemap_get_entry(int fd, char *start);
65 bool pagemap_is_softdirty(int fd, char *start);
66 bool pagemap_is_swapped(int fd, char *start);
67 bool pagemap_is_populated(int fd, char *start);
68 unsigned long pagemap_get_pfn(int fd, char *start);
69 void clear_softdirty(void);
70 bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
71 uint64_t read_pmd_pagesize(void);
72 unsigned long rss_anon(void);
73 bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
74 bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
75 bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
76 int64_t allocate_transhuge(void *ptr, int pagemap_fd);
77 unsigned long default_huge_page_size(void);
78 int detect_hugetlb_page_sizes(size_t sizes[], int max);
79
80 int uffd_register(int uffd, void *addr, uint64_t len,
81 bool miss, bool wp, bool minor);
82 int uffd_unregister(int uffd, void *addr, uint64_t len);
83 int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
84 bool miss, bool wp, bool minor, uint64_t *ioctls);
85 unsigned long get_free_hugepages(void);
86 bool check_vmflag_io(void *addr);
87 int open_procmap(pid_t pid, struct procmap_fd *procmap_out);
88 int query_procmap(struct procmap_fd *procmap);
89 bool find_vma_procmap(struct procmap_fd *procmap, void *address);
90 int close_procmap(struct procmap_fd *procmap);
91 int write_sysfs(const char *file_path, unsigned long val);
92 int read_sysfs(const char *file_path, unsigned long *val);
93
open_self_procmap(struct procmap_fd * procmap_out)94 static inline int open_self_procmap(struct procmap_fd *procmap_out)
95 {
96 pid_t pid = getpid();
97
98 return open_procmap(pid, procmap_out);
99 }
100
101 /* These helpers need to be inline to match the kselftest.h idiom. */
102 static char test_name[1024];
103
log_test_start(const char * name,...)104 static inline void log_test_start(const char *name, ...)
105 {
106 va_list args;
107 va_start(args, name);
108
109 vsnprintf(test_name, sizeof(test_name), name, args);
110 ksft_print_msg("[RUN] %s\n", test_name);
111
112 va_end(args);
113 }
114
log_test_result(int result)115 static inline void log_test_result(int result)
116 {
117 ksft_test_result_report(result, "%s\n", test_name);
118 }
119
120 /*
121 * On ppc64 this will only work with radix 2M hugepage size
122 */
123 #define HPAGE_SHIFT 21
124 #define HPAGE_SIZE (1 << HPAGE_SHIFT)
125
126 #define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
127 #define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
128