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qtest/ahci: add fragmented dma test

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Test what happens when we try to use extremely short PRDTs
to accomplish a small data transfer.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1424905602-24715-7-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow 2015-02-25 18:06:40 -05:00 committed by Kevin Wolf
parent bda39dc241
commit e0c59cc760
1 changed files with 59 additions and 0 deletions
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59
tests/ahci-test.c
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@ -851,6 +851,63 @@ static void test_identify(void)
ahci_shutdown(ahci);
}
/**
* Fragmented DMA test: Perform a standard 4K DMA read/write
* test, but make sure the physical regions are fragmented to
* be very small, each just 32 bytes, to see how AHCI performs
* with chunks defined to be much less than a sector.
*/
static void test_dma_fragmented(void)
{
AHCIQState *ahci;
AHCICommand *cmd;
uint8_t px;
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();
px = ahci_port_select(ahci);
ahci_port_clear(ahci, px);
/* create pattern */
for (i = 0; i < bufsize; i++) {
tx[i] = (bufsize - i);
}
/* Create a DMA buffer in guest memory, and write our pattern to it. */
ptr = guest_alloc(ahci->parent->alloc, bufsize);
g_assert(ptr);
memwrite(ptr, tx, bufsize);
cmd = ahci_command_create(CMD_WRITE_DMA);
ahci_command_adjust(cmd, 0, ptr, bufsize, 32);
ahci_command_commit(ahci, cmd, px);
ahci_command_issue(ahci, cmd);
ahci_command_verify(ahci, cmd);
g_free(cmd);
cmd = ahci_command_create(CMD_READ_DMA);
ahci_command_adjust(cmd, 0, ptr, bufsize, 32);
ahci_command_commit(ahci, cmd, px);
ahci_command_issue(ahci, cmd);
ahci_command_verify(ahci, cmd);
g_free(cmd);
/* Read back the guest's receive buffer into local memory */
memread(ptr, rx, bufsize);
guest_free(ahci->parent->alloc, ptr);
g_assert_cmphex(memcmp(tx, rx, bufsize), ==, 0);
ahci_shutdown(ahci);
g_free(rx);
g_free(tx);
}
/******************************************************************************/
/* AHCI I/O Test Matrix Definitions */
@ -1054,6 +1111,8 @@ int main(int argc, char **argv)
}
}
qtest_add_func("/ahci/io/dma/lba28/fragmented", test_dma_fragmented);
ret = g_test_run();
/* Cleanup */