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 33 static inline unsigned int psize(void) 34 { 35 if (!__page_size) 36 __page_size = sysconf(_SC_PAGESIZE); 37 return __page_size; 38 } 39 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 bool detect_huge_zeropage(void); 48 49 /* 50 * Plan 9 FS has bugs (at least on QEMU) where certain operations fail with 51 * ENOENT on unlinked files. See 52 * https://gitlab.com/qemu-project/qemu/-/issues/103 for some info about such 53 * bugs. There are rumours of NFS implementations with similar bugs. 54 * 55 * Ideally, tests should just detect filesystems known to have such issues and 56 * bail early. But 9pfs has the additional "feature" that it causes fstatfs to 57 * pass through the f_type field from the host filesystem. To avoid having to 58 * scrape /proc/mounts or some other hackery, tests can call this function when 59 * it seems such a bug might have been encountered. 60 */ 61 static inline void skip_test_dodgy_fs(const char *op_name) 62 { 63 ksft_test_result_skip("%s failed with ENOENT. Filesystem might be buggy (9pfs?)\n", op_name); 64 } 65 66 uint64_t pagemap_get_entry(int fd, char *start); 67 bool pagemap_is_softdirty(int fd, char *start); 68 bool pagemap_is_swapped(int fd, char *start); 69 bool pagemap_is_populated(int fd, char *start); 70 unsigned long pagemap_get_pfn(int fd, char *start); 71 void clear_softdirty(void); 72 bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len); 73 uint64_t read_pmd_pagesize(void); 74 unsigned long rss_anon(void); 75 bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size); 76 bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size); 77 bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size); 78 int64_t allocate_transhuge(void *ptr, int pagemap_fd); 79 unsigned long default_huge_page_size(void); 80 int detect_hugetlb_page_sizes(size_t sizes[], int max); 81 82 int uffd_register(int uffd, void *addr, uint64_t len, 83 bool miss, bool wp, bool minor); 84 int uffd_unregister(int uffd, void *addr, uint64_t len); 85 int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len, 86 bool miss, bool wp, bool minor, uint64_t *ioctls); 87 unsigned long get_free_hugepages(void); 88 bool check_vmflag_io(void *addr); 89 int open_procmap(pid_t pid, struct procmap_fd *procmap_out); 90 int query_procmap(struct procmap_fd *procmap); 91 bool find_vma_procmap(struct procmap_fd *procmap, void *address); 92 int close_procmap(struct procmap_fd *procmap); 93 int write_sysfs(const char *file_path, unsigned long val); 94 int read_sysfs(const char *file_path, unsigned long *val); 95 96 static inline int open_self_procmap(struct procmap_fd *procmap_out) 97 { 98 pid_t pid = getpid(); 99 100 return open_procmap(pid, procmap_out); 101 } 102 103 /* These helpers need to be inline to match the kselftest.h idiom. */ 104 static char test_name[1024]; 105 106 static inline void log_test_start(const char *name, ...) 107 { 108 va_list args; 109 va_start(args, name); 110 111 vsnprintf(test_name, sizeof(test_name), name, args); 112 ksft_print_msg("[RUN] %s\n", test_name); 113 114 va_end(args); 115 } 116 117 static inline void log_test_result(int result) 118 { 119 ksft_test_result_report(result, "%s\n", test_name); 120 } 121 122 void *sys_mremap(void *old_address, unsigned long old_size, 123 unsigned long new_size, int flags, void *new_address); 124 125 /* 126 * On ppc64 this will only work with radix 2M hugepage size 127 */ 128 #define HPAGE_SHIFT 21 129 #define HPAGE_SIZE (1 << HPAGE_SHIFT) 130 131 #define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0) 132 #define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1)) 133