Use a more proper fix for enabling HT MSI mapping windows on Host-PCI

bridges.  Rather than blindly enabling the windows on all of them, only
enable the window when an MSI interrupt is enabled for a device behind
the bridge, similar to what already happens for HT PCI-PCI bridges.

To implement this, each x86 Host-PCI bridge driver has to be able to
locate it's actual backing device on bus 0.  For ACPI, use the _ADR
method to find the slot and function of the device.  For the non-ACPI
case, the legacy(4) driver already scans bus 0 looking for Host-PCI
bridge devices.  Now it saves the slot and function of each bridge that
it finds as ivars that the Host-PCI bridge driver can then use in its
pcib_map_msi() method.

This fixes machines where non-MSI interrupts were broken by the previous
round of HT MSI changes.

Tested by:	bapt
MFC after:	1 week

1 files changed, 19 insertions, 3 deletions

diff --git a/sys/x86/pci/pci_bus.c b/sys/x86/pci/pci_bus.c
index 995e714..4363e7b 100644
--- a/sys/x86/pci/pci_bus.c
+++ b/sys/x86/pci/pci_bus.c
@@ -112,14 +112,28 @@ legacy_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
 	return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
 }
 
-static int
+int
 legacy_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
     uint32_t *data)
 {
-	device_t bus;
+	device_t bus, hostb;
+	int error, func, slot;
 
 	bus = device_get_parent(pcib);
-	return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
+	error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
+	if (error)
+		return (error);
+
+	slot = legacy_get_pcislot(pcib);
+	func = legacy_get_pcifunc(pcib);
+	if (slot == -1 || func == -1)
+		return (0);
+	hostb = pci_find_bsf(0, slot, func);
+	KASSERT(hostb != NULL, ("%s: missing hostb for 0:%d:%d", __func__,
+	    slot, func));
+	pci_ht_map_msi(hostb, *addr);
+	return (0);
+	
 }
 
 static const char *
@@ -453,6 +467,8 @@ legacy_pcib_identify(driver_t *driver, device_t parent)
 					      "pcib", busnum);
 			device_set_desc(child, s);
 			legacy_set_pcibus(child, busnum);
+			legacy_set_pcislot(child, slot);
+			legacy_set_pcifunc(child, func);
 
 			found = 1;
 			if (id == 0x12258086)