[PULL 1/5] hw/alpha: Set minimum PCI device ID to 1 to match Clipper IRQ mappings

[Richard Henderson <richard.henderson@linaro.org>]

From: Jason Thorpe <thorpej@me.com>

Since we are emulating a Clipper device topology, we need to set the
minimum PCI device ID to 1, as there is no IRQ mapping for a device
at ID 0 (see sys_dp264.c:clipper_map_irq()).

- Add a 'devfn_min' argument to typhoon_init().  Pass that argument
  along to pci_register_root_bus().
- In clipper_init(), pass PCI_DEVFN(1, 0) as the minimum PCI device
  ID/function.

Signed-off-by: Jason Thorpe <thorpej@me.com>
Message-Id: <20210613211549.18094-3-thorpej@me.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 hw/alpha/alpha_sys.h | 2 +-
 hw/alpha/dp264.c     | 7 +++++--
 hw/alpha/typhoon.c   | 5 +++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/hw/alpha/alpha_sys.h b/hw/alpha/alpha_sys.h
index e2c02e2bbe..4835b3d5ee 100644
--- a/hw/alpha/alpha_sys.h
+++ b/hw/alpha/alpha_sys.h
@@ -11,7 +11,7 @@
 
 
 PCIBus *typhoon_init(MemoryRegion *, ISABus **, qemu_irq *, AlphaCPU *[4],
-                     pci_map_irq_fn);
+                     pci_map_irq_fn, uint8_t devfn_min);
 
 /* alpha_pci.c.  */
 extern const MemoryRegionOps alpha_pci_ignore_ops;
diff --git a/hw/alpha/dp264.c b/hw/alpha/dp264.c
index 1017ecf330..010d22476b 100644
--- a/hw/alpha/dp264.c
+++ b/hw/alpha/dp264.c
@@ -76,9 +76,12 @@ static void clipper_init(MachineState *machine)
     cpus[0]->env.trap_arg1 = 0;
     cpus[0]->env.trap_arg2 = smp_cpus;
 
-    /* Init the chipset.  */
+    /*
+     * Init the chipset.  Because we're using CLIPPER IRQ mappings,
+     * the minimum PCI device IdSel is 1.
+     */
     pci_bus = typhoon_init(machine->ram, &isa_bus, &rtc_irq, cpus,
-                           clipper_pci_map_irq);
+                           clipper_pci_map_irq, PCI_DEVFN(1, 0));
 
     /* Since we have an SRM-compatible PALcode, use the SRM epoch.  */
     mc146818_rtc_init(isa_bus, 1900, rtc_irq);
diff --git a/hw/alpha/typhoon.c b/hw/alpha/typhoon.c
index 87020cbe0d..fa31a2f286 100644
--- a/hw/alpha/typhoon.c
+++ b/hw/alpha/typhoon.c
@@ -815,7 +815,8 @@ static void typhoon_alarm_timer(void *opaque)
 }
 
 PCIBus *typhoon_init(MemoryRegion *ram, ISABus **isa_bus, qemu_irq *p_rtc_irq,
-                     AlphaCPU *cpus[4], pci_map_irq_fn sys_map_irq)
+                     AlphaCPU *cpus[4], pci_map_irq_fn sys_map_irq,
+                     uint8_t devfn_min)
 {
     MemoryRegion *addr_space = get_system_memory();
     DeviceState *dev;
@@ -885,7 +886,7 @@ PCIBus *typhoon_init(MemoryRegion *ram, ISABus **isa_bus, qemu_irq *p_rtc_irq,
     b = pci_register_root_bus(dev, "pci",
                               typhoon_set_irq, sys_map_irq, s,
                               &s->pchip.reg_mem, &s->pchip.reg_io,
-                              0, 64, TYPE_PCI_BUS);
+                              devfn_min, 64, TYPE_PCI_BUS);
     phb->bus = b;
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 
-- 
2.25.1