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