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