1 /*
2 * Copyright (c) 2023 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include "intel_mem.h"
25 #include "util/u_cpu_detect.h"
26
27 #ifndef HAVE___BUILTIN_IA32_CLFLUSHOPT
28 #error "Compiler doesn't support clflushopt!"
29 #endif
30
31 void intel_clflushopt_range(void *start, size_t size);
32
33 void
intel_clflushopt_range(void * start,size_t size)34 intel_clflushopt_range(void *start, size_t size)
35 {
36 const struct util_cpu_caps_t *cpu_caps = util_get_cpu_caps();
37 assert(cpu_caps->has_clflushopt);
38 assert(cpu_caps->cacheline > 0);
39 void *p = (void *) (((uintptr_t) start) &
40 ~((uintptr_t)cpu_caps->cacheline - 1));
41 void *end = start + size;
42
43 while (p < end) {
44 __builtin_ia32_clflushopt(p);
45 p += cpu_caps->cacheline;
46 }
47 }
48