1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * CMM migration tests (ESSA)
4 *
5 * Copyright IBM Corp. 2022
6 *
7 * Authors:
8 * Nico Boehr <nrb@linux.ibm.com>
9 */
10
11 #include <libcflat.h>
12 #include <migrate.h>
13 #include <asm/interrupt.h>
14 #include <asm/page.h>
15 #include <asm/cmm.h>
16 #include <bitops.h>
17
18 #define NUM_PAGES 128
19 static uint8_t pagebuf[NUM_PAGES][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
20
test_migration(void)21 static void test_migration(void)
22 {
23 int i, state_mask, actual_state;
24 /*
25 * Maps ESSA actions to states the page is allowed to be in after the
26 * respective action was executed.
27 */
28 int allowed_essa_state_masks[4] = {
29 BIT(ESSA_USAGE_STABLE), /* ESSA_SET_STABLE */
30 BIT(ESSA_USAGE_UNUSED), /* ESSA_SET_UNUSED */
31 BIT(ESSA_USAGE_VOLATILE), /* ESSA_SET_VOLATILE */
32 BIT(ESSA_USAGE_VOLATILE) | BIT(ESSA_USAGE_POT_VOLATILE) /* ESSA_SET_POT_VOLATILE */
33 };
34
35 assert(NUM_PAGES % 4 == 0);
36 for (i = 0; i < NUM_PAGES; i += 4) {
37 essa(ESSA_SET_STABLE, (unsigned long)pagebuf[i]);
38 essa(ESSA_SET_UNUSED, (unsigned long)pagebuf[i + 1]);
39 essa(ESSA_SET_VOLATILE, (unsigned long)pagebuf[i + 2]);
40 essa(ESSA_SET_POT_VOLATILE, (unsigned long)pagebuf[i + 3]);
41 }
42
43 migrate_once();
44
45 for (i = 0; i < NUM_PAGES; i++) {
46 actual_state = essa(ESSA_GET_STATE, (unsigned long)pagebuf[i]);
47 /* extract the usage state in bits 60 and 61 */
48 actual_state = (actual_state >> 2) & 0x3;
49 state_mask = allowed_essa_state_masks[i % ARRAY_SIZE(allowed_essa_state_masks)];
50 report(BIT(actual_state) & state_mask, "page %d state: expected_mask=0x%x actual_mask=0x%lx", i, state_mask, BIT(actual_state));
51 }
52 }
53
main(void)54 int main(void)
55 {
56 report_prefix_push("migration-cmm");
57
58 if (!check_essa_available()) {
59 report_skip("ESSA is not available");
60 migrate_skip();
61 } else {
62 test_migration();
63 }
64
65 report_prefix_pop();
66 return report_summary();
67 }
68