#define MFD_HUGETLB 0x0004U
#endif
-uword
-clib_mem_get_page_size (void)
-{
- return getpagesize ();
-}
+#ifndef MAP_HUGE_SHIFT
+#define MAP_HUGE_SHIFT 26
+#endif
+
+#ifndef MAP_FIXED_NOREPLACE
+#define MAP_FIXED_NOREPLACE 0x100000
+#endif
uword
clib_mem_get_default_hugepage_size (void)
return st.st_blksize;
}
-int
+clib_mem_page_sz_t
clib_mem_get_fd_log2_page_size (int fd)
{
- return min_log2 (clib_mem_get_fd_page_size (fd));
+ uword page_size = clib_mem_get_fd_page_size (fd);
+ return page_size ? min_log2 (page_size) : CLIB_MEM_PAGE_SZ_UNKNOWN;
}
void
uword
clib_mem_vm_reserve (uword start, uword size, clib_mem_page_sz_t log2_page_sz)
{
- uword off, pagesize = 1ULL << log2_page_sz;
- int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
- u8 *p;
-
- if (start)
- mmap_flags |= MAP_FIXED;
+ clib_mem_main_t *mm = &clib_mem_main;
+ uword pagesize = 1ULL << log2_page_sz;
+ uword sys_page_sz = 1ULL << mm->log2_page_sz;
+ uword n_bytes;
+ void *base = 0, *p;
size = round_pow2 (size, pagesize);
- p = uword_to_pointer (start, void *);
- p = mmap (p, size + pagesize, PROT_NONE, mmap_flags, -1, 0);
+ /* in adition of requested reservation, we also rserve one system page
+ * (typically 4K) adjacent to the start off reservation */
+
+ if (start)
+ {
+ /* start address is provided, so we just need to make sure we are not
+ * replacing existing map */
+ if (start & pow2_mask (log2_page_sz))
+ return ~0;
+
+ base = (void *) start - sys_page_sz;
+ base = mmap (base, size + sys_page_sz, PROT_NONE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE, -1, 0);
+ return (base == MAP_FAILED) ? ~0 : start;
+ }
+
+ /* to make sure that we get reservation aligned to page_size we need to
+ * request one additional page as mmap will return us address which is
+ * aligned only to system page size */
+ base = mmap (0, size + pagesize, PROT_NONE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (p == MAP_FAILED)
+ if (base == MAP_FAILED)
return ~0;
- off = round_pow2 ((uword) p, pagesize) - (uword) p;
+ /* return additional space at the end of allocation */
+ p = base + size + pagesize;
+ n_bytes = (uword) p & pow2_mask (log2_page_sz);
+ if (n_bytes)
+ {
+ p -= n_bytes;
+ munmap (p, n_bytes);
+ }
- /* trim start and end of reservation to be page aligned */
- if (off)
+ /* return additional space at the start of allocation */
+ n_bytes = pagesize - sys_page_sz - n_bytes;
+ if (n_bytes)
{
- munmap (p, off);
- p += off;
+ munmap (base, n_bytes);
+ base += n_bytes;
}
- munmap (p + size, pagesize - off);
+ return (uword) base + sys_page_sz;
+}
- return (uword) p;
+clib_mem_vm_map_hdr_t *
+clib_mem_vm_get_next_map_hdr (clib_mem_vm_map_hdr_t * hdr)
+{
+ clib_mem_main_t *mm = &clib_mem_main;
+ uword sys_page_sz = 1 << mm->log2_page_sz;
+ clib_mem_vm_map_hdr_t *next;
+ if (hdr == 0)
+ {
+ hdr = mm->first_map;
+ if (hdr)
+ mprotect (hdr, sys_page_sz, PROT_READ);
+ return hdr;
+ }
+ next = hdr->next;
+ mprotect (hdr, sys_page_sz, PROT_NONE);
+ if (next)
+ mprotect (next, sys_page_sz, PROT_READ);
+ return next;
}
+void *
+clib_mem_vm_map_internal (void *base, clib_mem_page_sz_t log2_page_sz,
+ uword size, int fd, uword offset, char *name)
+{
+ clib_mem_main_t *mm = &clib_mem_main;
+ clib_mem_vm_map_hdr_t *hdr;
+ uword sys_page_sz = 1 << mm->log2_page_sz;
+ int mmap_flags = MAP_FIXED, is_huge = 0;
+
+ if (fd != -1)
+ {
+ mmap_flags |= MAP_SHARED;
+ log2_page_sz = clib_mem_get_fd_log2_page_size (fd);
+ if (log2_page_sz > mm->log2_page_sz)
+ is_huge = 1;
+ }
+ else
+ {
+ mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
+
+ if (log2_page_sz == mm->log2_page_sz)
+ log2_page_sz = CLIB_MEM_PAGE_SZ_DEFAULT;
+
+ switch (log2_page_sz)
+ {
+ case CLIB_MEM_PAGE_SZ_UNKNOWN:
+ /* will fail later */
+ break;
+ case CLIB_MEM_PAGE_SZ_DEFAULT:
+ log2_page_sz = mm->log2_page_sz;
+ break;
+ case CLIB_MEM_PAGE_SZ_DEFAULT_HUGE:
+ mmap_flags |= MAP_HUGETLB;
+ log2_page_sz = mm->log2_default_hugepage_sz;
+ is_huge = 1;
+ break;
+ default:
+ mmap_flags |= MAP_HUGETLB;
+ mmap_flags |= log2_page_sz << MAP_HUGE_SHIFT;
+ is_huge = 1;
+ }
+ }
+
+ if (log2_page_sz == CLIB_MEM_PAGE_SZ_UNKNOWN)
+ return CLIB_MEM_VM_MAP_FAILED;
+
+ size = round_pow2 (size, 1 << log2_page_sz);
+
+ base = (void *) clib_mem_vm_reserve ((uword) base, size, log2_page_sz);
+
+ if (base == (void *) ~0)
+ return CLIB_MEM_VM_MAP_FAILED;
+
+ base = mmap (base, size, PROT_READ | PROT_WRITE, mmap_flags, fd, offset);
+
+ if (base == MAP_FAILED)
+ return CLIB_MEM_VM_MAP_FAILED;
+
+ if (is_huge && (mlock (base, size) != 0))
+ {
+ munmap (base, size);
+ return CLIB_MEM_VM_MAP_FAILED;
+ }
+
+ hdr = mmap (base - sys_page_sz, sys_page_sz, PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+
+ if (hdr != base - sys_page_sz)
+ {
+ munmap (base, size);
+ return CLIB_MEM_VM_MAP_FAILED;
+ }
+
+ if (mm->last_map)
+ {
+ mprotect (mm->last_map, sys_page_sz, PROT_READ | PROT_WRITE);
+ mm->last_map->next = hdr;
+ mprotect (mm->last_map, sys_page_sz, PROT_NONE);
+ }
+ else
+ mm->first_map = hdr;
+
+ hdr->next = 0;
+ hdr->prev = mm->last_map;
+ mm->last_map = hdr;
+
+ hdr->base_addr = (uword) base;
+ hdr->log2_page_sz = log2_page_sz;
+ hdr->num_pages = size >> log2_page_sz;
+ snprintf (hdr->name, CLIB_VM_MAP_HDR_NAME_MAX_LEN - 1, "%s", (char *) name);
+ hdr->name[CLIB_VM_MAP_HDR_NAME_MAX_LEN - 1] = 0;
+ mprotect (hdr, sys_page_sz, PROT_NONE);
+
+ CLIB_MEM_UNPOISON (base, size);
+ return base;
+}
+
+int
+clib_mem_vm_unmap (void *base)
+{
+ clib_mem_main_t *mm = &clib_mem_main;
+ uword size, sys_page_sz = 1 << mm->log2_page_sz;
+ clib_mem_vm_map_hdr_t *hdr = base - sys_page_sz;;
+
+ if (mprotect (hdr, sys_page_sz, PROT_READ | PROT_WRITE) != 0)
+ return -1;
+
+ size = hdr->num_pages << hdr->log2_page_sz;
+ if (munmap ((void *) hdr->base_addr, size) != 0)
+ return -1;
+
+ if (hdr->next)
+ {
+ mprotect (hdr->next, sys_page_sz, PROT_READ | PROT_WRITE);
+ hdr->next->prev = hdr->prev;
+ mprotect (hdr->next, sys_page_sz, PROT_NONE);
+ }
+ else
+ mm->last_map = hdr->prev;
+
+ if (hdr->prev)
+ {
+ mprotect (hdr->prev, sys_page_sz, PROT_READ | PROT_WRITE);
+ hdr->prev->next = hdr->next;
+ mprotect (hdr->prev, sys_page_sz, PROT_NONE);
+ }
+ else
+ mm->first_map = hdr->next;
+
+ if (munmap (hdr, sys_page_sz) != 0)
+ return -1;
+
+ return 0;
+}
+
+void
+clib_mem_get_page_stats (void *start, clib_mem_page_sz_t log2_page_size,
+ uword n_pages, clib_mem_page_stats_t * stats)
+{
+ int i, *status = 0;
+ void **ptr = 0;
+
+ log2_page_size = clib_mem_log2_page_size_validate (log2_page_size);
+
+ vec_validate (status, n_pages - 1);
+ vec_validate (ptr, n_pages - 1);
+
+ for (i = 0; i < n_pages; i++)
+ ptr[i] = start + (i << log2_page_size);
+
+ clib_memset (stats, 0, sizeof (clib_mem_page_stats_t));
+
+ if (move_pages (0, n_pages, ptr, 0, status, 0) != 0)
+ {
+ stats->unknown = n_pages;
+ return;
+ }
+
+ for (i = 0; i < n_pages; i++)
+ {
+ if (status[i] >= 0 && status[i] < CLIB_MAX_NUMAS)
+ {
+ stats->mapped++;
+ stats->per_numa[status[i]]++;
+ }
+ else if (status[i] == -EFAULT)
+ stats->not_mapped++;
+ else
+ stats->unknown++;
+ }
+}
+
+
u64 *
-clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
+clib_mem_vm_get_paddr (void *mem, clib_mem_page_sz_t log2_page_size,
+ int n_pages)
{
int pagesize = sysconf (_SC_PAGESIZE);
int fd;
int i;
u64 *r = 0;
+ log2_page_size = clib_mem_log2_page_size_validate (log2_page_size);
+
if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1)
return 0;
Code Review / vpp.git / blobdiff