[SeaBIOS] [Qemu-devel] [PATCH v4 for-2.3 22/25] hw/pci: piix - suport multiple host bridges
Marcel Apfelbaum
marcel at redhat.com
Sun Mar 8 12:16:24 CET 2015
From: Marcel Apfelbaum <marcel.a at redhat.com>
Instead of assuming it has only one bus, it
enumerates all the host bridges until it finds
the one with bus number corresponding with the
config register.
Signed-off-by: Marcel Apfelbaum <marcel at redhat.com>
---
hw/pci-host/piix.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 56 insertions(+), 1 deletion(-)
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 0033ab4..3c3a192 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -255,6 +255,61 @@ static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v,
visit_type_uint64(v, &w64.end, name, errp);
}
+static PCIBus *i440fx_find_primary_bus(int bus_num)
+{
+ PCIHostState *host;
+ PCIBus *bus = NULL;
+ int current = -1;
+
+ HOST_BRIDGE_FOREACH(host) {
+ int b = pci_bus_num(host->bus);
+ if (b <= bus_num && b > current) {
+ current = b;
+ bus = host->bus;
+ }
+ }
+
+ return bus;
+}
+
+static void i440fx_pcihost_data_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned len)
+{
+ uint32_t config_reg = PCI_HOST_BRIDGE(opaque)->config_reg;
+
+ if (config_reg & (1u << 31)) {
+ int bus_num = (config_reg >> 16) & 0xFF;
+ PCIBus *bus = i440fx_find_primary_bus(bus_num);
+
+ if (bus) {
+ pci_data_write(bus, config_reg | (addr & 3), val, len);
+ }
+ }
+}
+
+static uint64_t i440fx_pcihost_data_read(void *opaque,
+ hwaddr addr, unsigned len)
+{
+ uint32_t config_reg = PCI_HOST_BRIDGE(opaque)->config_reg;
+
+ if (config_reg & (1U << 31)) {
+ int bus_num = (config_reg >> 16) & 0xFF;
+ PCIBus *bus = i440fx_find_primary_bus(bus_num);
+
+ if (bus) {
+ return pci_data_read(bus, config_reg | (addr & 3), len);
+ }
+ }
+
+ return 0xffffffff;
+}
+
+const MemoryRegionOps i440fx_pcihost_data_le_ops = {
+ .read = i440fx_pcihost_data_read,
+ .write = i440fx_pcihost_data_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
static void i440fx_pcihost_initfn(Object *obj)
{
PCIHostState *s = PCI_HOST_BRIDGE(obj);
@@ -262,7 +317,7 @@ static void i440fx_pcihost_initfn(Object *obj)
memory_region_init_io(&s->conf_mem, obj, &pci_host_conf_le_ops, s,
"pci-conf-idx", 4);
- memory_region_init_io(&s->data_mem, obj, &pci_host_data_le_ops, s,
+ memory_region_init_io(&s->data_mem, obj, &i440fx_pcihost_data_le_ops, s,
"pci-conf-data", 4);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
--
2.1.0
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