[SeaBIOS] [RFC PATCH v2 4/4] pci: enable RedHat PCI bridges to reserve additional buses on PCI init
Aleksandr Bezzubikov
zuban32s at gmail.com
Sun Jul 23 00:11:50 CEST 2017
In case of Red Hat PCI bridges reserve additional buses, which number is provided
in a vendor-specific capability.
Signed-off-by: Aleksandr Bezzubikov <zuban32s at gmail.com>
---
src/fw/pciinit.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
index 864954f..f05a8b9 100644
--- a/src/fw/pciinit.c
+++ b/src/fw/pciinit.c
@@ -15,6 +15,7 @@
#include "hw/pcidevice.h" // pci_probe_devices
#include "hw/pci_ids.h" // PCI_VENDOR_ID_INTEL
#include "hw/pci_regs.h" // PCI_COMMAND
+#include "hw/pci_cap.h" // qemu_pci_cap
#include "list.h" // struct hlist_node
#include "malloc.h" // free
#include "output.h" // dprintf
@@ -578,9 +579,18 @@ pci_bios_init_bus_rec(int bus, u8 *pci_bus)
pci_bios_init_bus_rec(secbus, pci_bus);
if (subbus != *pci_bus) {
+ u8 res_bus = 0;
+ if (pci_config_readw(bdf, PCI_VENDOR_ID) == PCI_VENDOR_ID_REDHAT) {
+ u8 cap = pci_find_capability(bdf, PCI_CAP_ID_VNDR, 0);
+ if (cap) {
+ res_bus = pci_config_readb(bdf,
+ cap + offsetof(struct redhat_pci_bridge_cap,
+ bus_res));
+ }
+ }
dprintf(1, "PCI: subordinate bus = 0x%x -> 0x%x\n",
- subbus, *pci_bus);
- subbus = *pci_bus;
+ subbus, *pci_bus + res_bus);
+ subbus = *pci_bus + res_bus;
} else {
dprintf(1, "PCI: subordinate bus = 0x%x\n", subbus);
}
--
2.7.4
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