| Arnaldo Carvalho de Melo | 1250090 | 2019-08-22 16:58:29 -0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include "cacheline.h" |
| Arnaldo Carvalho de Melo | 1250090 | 2019-08-22 16:58:29 -0300 | [diff] [blame] | 3 | #include <unistd.h> |
| 4 | |
| 5 | #ifdef _SC_LEVEL1_DCACHE_LINESIZE |
| 6 | #define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE) |
| 7 | #else |
| 8 | #include <api/fs/fs.h> |
| 9 | #include "debug.h" |
| 10 | static void cache_line_size(int *cacheline_sizep) |
| 11 | { |
| 12 | if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep)) |
| 13 | pr_debug("cannot determine cache line size"); |
| 14 | } |
| 15 | #endif |
| 16 | |
| 17 | int cacheline_size(void) |
| 18 | { |
| 19 | static int size; |
| 20 | |
| 21 | if (!size) |
| 22 | cache_line_size(&size); |
| 23 | |
| 24 | return size; |
| 25 | } |