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 /* 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 */ 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 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]; 103 104 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 } 114 115 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