[undi] Include subsystem IDs in broken interrupt device check

Allow the subsystem IDs to be used when checking for PXE stacks with
broken interrupt support.

Suggested-by: Levi Hsieh <Levi.Hsieh@dell.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/drivers/net/undinet.c

 #include <ipxe/netdevice.h>
 #include <ipxe/if_ether.h>
 #include <ipxe/ethernet.h>
+#include <ipxe/pci.h>
 #include <ipxe/profile.h>
 #include <undi.h>
 #include <undinet.h>
 	uint16_t pci_vendor;
 	/** PCI device ID */
 	uint16_t pci_device;
+	/** PCI subsystem vendor ID */
+	uint16_t pci_subsys_vendor;
+	/** PCI subsystem ID */
+	uint16_t pci_subsys;
 };
 
 /**
  */
 static const struct undinet_irq_broken undinet_irq_broken_list[] = {
 	/* HP XX70x laptops */
-	{ .pci_vendor = 0x8086, .pci_device = 0x1502 },
-	{ .pci_vendor = 0x8086, .pci_device = 0x1503 },
+	{ 0x8086, 0x1502, PCI_ANY_ID, PCI_ANY_ID },
+	{ 0x8086, 0x1503, PCI_ANY_ID, PCI_ANY_ID },
 	/* HP 745 G3 laptop */
-	{ .pci_vendor = 0x14e4, .pci_device = 0x1687 },
+	{ 0x14e4, 0x1687, PCI_ANY_ID, PCI_ANY_ID },
 };
 
 /**
  */
 static int undinet_irq_is_broken ( struct device_description *desc ) {
 	const struct undinet_irq_broken *broken;
+	struct pci_device pci;
+	uint16_t subsys_vendor;
+	uint16_t subsys;
 	unsigned int i;
 
+	/* Ignore non-PCI devices */
+	if ( desc->bus_type != BUS_TYPE_PCI )
+		return 0;
+
+	/* Read subsystem IDs */
+	pci_init ( &pci, desc->location );
+	pci_read_config_word ( &pci, PCI_SUBSYSTEM_VENDOR_ID, &subsys_vendor );
+	pci_read_config_word ( &pci, PCI_SUBSYSTEM_ID, &subsys );
+
+	/* Check for a match against the broken device list */
 	for ( i = 0 ; i < ( sizeof ( undinet_irq_broken_list ) /
 			    sizeof ( undinet_irq_broken_list[0] ) ) ; i++ ) {
 		broken = &undinet_irq_broken_list[i];
-		if ( ( desc->bus_type == BUS_TYPE_PCI ) &&
-		     ( desc->vendor == broken->pci_vendor ) &&
-		     ( desc->device == broken->pci_device ) ) {
+		if ( ( broken->pci_vendor == desc->vendor ) &&
+		     ( broken->pci_device == desc->device ) &&
+		     ( ( broken->pci_subsys_vendor == subsys_vendor ) ||
+		       ( broken->pci_subsys_vendor == PCI_ANY_ID ) ) &&
+		     ( ( broken->pci_subsys == subsys ) ||
+		       ( broken->pci_subsys == PCI_ANY_ID ) ) ) {
 			return 1;
 		}
 	}