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qtest/ahci: export generate_pattern

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Share the pattern function for ide and ahci test.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1441926555-19471-3-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2015-09-17 14:17:04 -04:00
parent d7531638db
commit ab4f705751
3 changed files with 27 additions and 26 deletions
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26
tests/libqos/libqos.c
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@ -212,3 +212,29 @@ void prepare_blkdebug_script(const char *debug_fn, const char *event)
ret = fclose(debug_file);
g_assert(ret == 0);
}
void generate_pattern(void *buffer, size_t len, size_t cycle_len)
{
int i, j;
unsigned char *tx = (unsigned char *)buffer;
unsigned char p;
size_t *sx;
/* Write an indicative pattern that varies and is unique per-cycle */
p = rand() % 256;
for (i = 0; i < len; i++) {
tx[i] = p++ % 256;
if (i % cycle_len == 0) {
p = rand() % 256;
}
}
/* force uniqueness by writing an id per-cycle */
for (i = 0; i < len / cycle_len; i++) {
j = i * cycle_len;
if (j + sizeof(*sx) <= len) {
sx = (size_t *)&tx[j];
*sx = i;
}
}
}