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ide-test: Check what happens with bus mastering disabled 

The main goal is that qemu doesn't crash.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Kevin Wolf 2013-07-22 14:26:25 +02:00
parent e85d9db5f6
commit d7b7e58009
1 changed files with 26 additions and 0 deletions
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26
tests/ide-test.c
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@ -81,6 +81,7 @@ enum {
CMD_IDENTIFY = 0xec,
CMDF_ABORT = 0x100,
CMDF_NO_BM = 0x200,
};
enum {
@ -192,6 +193,11 @@ static int send_dma_request(int cmd, uint64_t sector, int nb_sectors,
g_assert_not_reached();
}
if (flags & CMDF_NO_BM) {
qpci_config_writew(dev, PCI_COMMAND,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
}
/* Select device 0 */
outb(IDE_BASE + reg_device, 0 | LBA);
@ -352,6 +358,25 @@ static void test_bmdma_long_prdt(void)
assert_bit_clear(inb(IDE_BASE + reg_status), DF | ERR);
}
static void test_bmdma_no_busmaster(void)
{
uint8_t status;
/* No PRDT_EOT, each entry addr 0/size 64k, and in theory qemu shouldn't be
* able to access it anyway because the Bus Master bit in the PCI command
* register isn't set. This is complete nonsense, but it used to be pretty
* good at confusing and occasionally crashing qemu. */
PrdtEntry prdt[4096] = { };
status = send_dma_request(CMD_READ_DMA | CMDF_NO_BM, 0, 512,
prdt, ARRAY_SIZE(prdt));
/* Not entirely clear what the expected result is, but this is what we get
* in practice. At least we want to be aware of any changes. */
g_assert_cmphex(status, ==, BM_STS_ACTIVE | BM_STS_INTR);
assert_bit_clear(inb(IDE_BASE + reg_status), DF | ERR);
}
static void test_bmdma_setup(void)
{
ide_test_start(
@ -493,6 +518,7 @@ int main(int argc, char **argv)
qtest_add_func("/ide/bmdma/simple_rw", test_bmdma_simple_rw);
qtest_add_func("/ide/bmdma/short_prdt", test_bmdma_short_prdt);
qtest_add_func("/ide/bmdma/long_prdt", test_bmdma_long_prdt);
qtest_add_func("/ide/bmdma/no_busmaster", test_bmdma_no_busmaster);
qtest_add_func("/ide/bmdma/teardown", test_bmdma_teardown);
qtest_add_func("/ide/flush", test_flush);