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ahci-test: improve rw buffer patterns 

My pattern was cyclical every 256 bytes, so it missed a fairly obvious
failure case. Add some rand() pepper into the test pattern, and for large
patterns that exceed 256 sectors, start writing an ID per-sector so that
we never generate identical sector patterns.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Message-id: 1426811056-2202-5-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2015-03-19 20:24:16 -04:00
parent ac38123609
commit 54fced034e
1 changed files with 28 additions and 8 deletions
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36
tests/ahci-test.c
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@ -68,6 +68,32 @@ static void string_bswap16(uint16_t *s, size_t bytes)
}
}
static 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 = j = 0; i < len; i++, j++) {
tx[i] = p;
if (j % 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;
}
}
}
/*** Test Setup & Teardown ***/
/**
@ -736,7 +762,6 @@ static void ahci_test_io_rw_simple(AHCIQState *ahci, unsigned bufsize,
{
uint64_t ptr;
uint8_t port;
unsigned i;
unsigned char *tx = g_malloc(bufsize);
unsigned char *rx = g_malloc0(bufsize);
@ -752,9 +777,7 @@ static void ahci_test_io_rw_simple(AHCIQState *ahci, unsigned bufsize,
g_assert(ptr);
/* Write some indicative pattern to our buffer. */
for (i = 0; i < bufsize; i++) {
tx[i] = (bufsize - i);
}
generate_pattern(tx, bufsize, AHCI_SECTOR_SIZE);
memwrite(ptr, tx, bufsize);
/* Write this buffer to disk, then read it back to the DMA buffer. */
@ -865,7 +888,6 @@ static void test_dma_fragmented(void)
size_t bufsize = 4096;
unsigned char *tx = g_malloc(bufsize);
unsigned char *rx = g_malloc0(bufsize);
unsigned i;
uint64_t ptr;
ahci = ahci_boot_and_enable();
@ -873,9 +895,7 @@ static void test_dma_fragmented(void)
ahci_port_clear(ahci, px);
/* create pattern */
for (i = 0; i < bufsize; i++) {
tx[i] = (bufsize - i);
}
generate_pattern(tx, bufsize, AHCI_SECTOR_SIZE);
/* Create a DMA buffer in guest memory, and write our pattern to it. */
ptr = guest_alloc(ahci->parent->alloc, bufsize);