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libqos/ahci: Add ahci_port_select helper

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This helper identifies which port of the
AHCI HBA has a device we may run tests on.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1423158090-25580-2-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
John Snow 2015-02-05 12:41:12 -05:00 • committed by Stefan Hajnoczi
parent b0e5d90ebc
commit e77448a385
3 changed files with 30 additions and 17 deletions
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27
tests/libqos/ahci.c
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@ -267,3 +267,30 @@ void ahci_hba_enable(AHCIQState *ahci)
* In the future, a small test-case to inspect the Register D2H FIS
* and clear the initial interrupts might be good. */
}
/**
* Pick the first implemented and running port
*/
unsigned ahci_port_select(AHCIQState *ahci)
{
uint32_t ports, reg;
unsigned i;
ports = ahci_rreg(ahci, AHCI_PI);
for (i = 0; i < 32; ports >>= 1, ++i) {
if (ports == 0) {
i = 32;
}
if (!(ports & 0x01)) {
continue;
}
reg = ahci_px_rreg(ahci, i, AHCI_PX_CMD);
if (BITSET(reg, AHCI_PX_CMD_ST)) {
break;
}
}
g_assert(i < 32);
return i;
}