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Add a tunable to force disable MSI use for xhci(4).

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Requested and tested by:	delphij
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
This commit is contained in:
Konstantin Belousov 2013-07-16 20:14:23 +00:00
parent e1f38054f5
commit 31b67ab26e
1 changed files with 12 additions and 7 deletions
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19
sys/dev/usb/controller/xhci_pci.c
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@ -132,6 +132,9 @@ xhci_pci_probe(device_t self)
}
}
static int xhci_use_msi = 1;
TUNABLE_INT("hw.usb.xhci.msi", &xhci_use_msi);
static void
xhci_interrupt_poll(void *_sc)
{
@ -171,13 +174,15 @@ xhci_pci_attach(device_t self)
usb_callout_init_mtx(&sc->sc_callout, &sc->sc_bus.bus_mtx, 0);
sc->sc_irq_rid = 0;
count = pci_msi_count(self);
if (count >= 1) {
count = 1;
if (pci_alloc_msi(self, &count) == 0) {
if (bootverbose)
device_printf(self, "MSI enabled\n");
sc->sc_irq_rid = 1;
if (xhci_use_msi) {
count = pci_msi_count(self);
if (count >= 1) {
count = 1;
if (pci_alloc_msi(self, &count) == 0) {
if (bootverbose)
device_printf(self, "MSI enabled\n");
sc->sc_irq_rid = 1;
}
}
}
sc->sc_irq_res = bus_alloc_resource_any(self, SYS_RES_IRQ,