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78391f6460
Provide two helpers to open an uffd handle. Drop the error checks around SKIPs because it's inside an errexit() anyway, which IMHO doesn't really help much if the test will not continue. Link: https://lkml.kernel.org/r/20230412164254.328335-1-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org> Reviewed-by: Axel Rasmussen <axelrasmussen@google.com> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Zach O'Keefe <zokeefe@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/mman.h>
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#include <err.h>
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#include <string.h> /* ffsl() */
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#include <unistd.h> /* _SC_PAGESIZE */
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#define BIT_ULL(nr) (1ULL << (nr))
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#define PM_SOFT_DIRTY BIT_ULL(55)
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#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
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#define PM_UFFD_WP BIT_ULL(57)
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#define PM_FILE BIT_ULL(61)
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#define PM_SWAP BIT_ULL(62)
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#define PM_PRESENT BIT_ULL(63)
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extern unsigned int __page_size;
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extern unsigned int __page_shift;
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static inline unsigned int psize(void)
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{
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if (!__page_size)
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__page_size = sysconf(_SC_PAGESIZE);
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return __page_size;
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}
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static inline unsigned int pshift(void)
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{
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if (!__page_shift)
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__page_shift = (ffsl(psize()) - 1);
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return __page_shift;
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}
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uint64_t pagemap_get_entry(int fd, char *start);
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bool pagemap_is_softdirty(int fd, char *start);
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bool pagemap_is_swapped(int fd, char *start);
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bool pagemap_is_populated(int fd, char *start);
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unsigned long pagemap_get_pfn(int fd, char *start);
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void clear_softdirty(void);
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bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len);
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uint64_t read_pmd_pagesize(void);
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bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
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bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
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bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
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int64_t allocate_transhuge(void *ptr, int pagemap_fd);
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unsigned long default_huge_page_size(void);
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int uffd_register(int uffd, void *addr, uint64_t len,
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bool miss, bool wp, bool minor);
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int uffd_unregister(int uffd, void *addr, uint64_t len);
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int uffd_open_dev(unsigned int flags);
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int uffd_open_sys(unsigned int flags);
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/*
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* On ppc64 this will only work with radix 2M hugepage size
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*/
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#define HPAGE_SHIFT 21
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#define HPAGE_SIZE (1 << HPAGE_SHIFT)
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#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
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#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
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