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[PATCH] hw/ppc/ppc4xx_pci: Fix ppc4xx_pci_map_irq() for recent Linux ker
From: |
Thomas Huth |
Subject: |
[PATCH] hw/ppc/ppc4xx_pci: Fix ppc4xx_pci_map_irq() for recent Linux kernels |
Date: |
Tue, 19 Oct 2021 11:18:17 +0200 |
Recent Linux kernels are accessing the PCI device in slot 0 that
represents the PCI host bridge. This causes ppc4xx_pci_map_irq()
to return -1 which causes an assert() later:
hw/pci/pci.c:262: pci_bus_change_irq_level: Assertion `irq_num >= 0' failed.
Thus we should allocate an IRQ line for the device in slot 0, too.
To avoid changes to the outside of ppc4xx_pci.c, we map it to
the internal IRQ number 4 which will then happily be ignored since
ppc440_bamboo.c does not wire it up.
With these changes it is now possible again to use recent Linux
kernels for the bamboo board.
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
hw/ppc/ppc4xx_pci.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/hw/ppc/ppc4xx_pci.c b/hw/ppc/ppc4xx_pci.c
index 8147ba6f94..304a29349c 100644
--- a/hw/ppc/ppc4xx_pci.c
+++ b/hw/ppc/ppc4xx_pci.c
@@ -48,12 +48,14 @@ OBJECT_DECLARE_SIMPLE_TYPE(PPC4xxPCIState,
PPC4xx_PCI_HOST_BRIDGE)
#define PPC4xx_PCI_NR_PMMS 3
#define PPC4xx_PCI_NR_PTMS 2
+#define PPC4xx_PCI_NUM_DEVS 5
+
struct PPC4xxPCIState {
PCIHostState parent_obj;
struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
- qemu_irq irq[PCI_NUM_PINS];
+ qemu_irq irq[PPC4xx_PCI_NUM_DEVS];
MemoryRegion container;
MemoryRegion iomem;
@@ -246,7 +248,7 @@ static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int
irq_num)
trace_ppc4xx_pci_map_irq(pci_dev->devfn, irq_num, slot);
- return slot - 1;
+ return slot > 0 ? slot - 1 : PPC4xx_PCI_NUM_DEVS - 1;
}
static void ppc4xx_pci_set_irq(void *opaque, int irq_num, int level)
@@ -254,7 +256,7 @@ static void ppc4xx_pci_set_irq(void *opaque, int irq_num,
int level)
qemu_irq *pci_irqs = opaque;
trace_ppc4xx_pci_set_irq(irq_num);
- assert(irq_num >= 0);
+ assert(irq_num >= 0 && irq_num < PPC4xx_PCI_NUM_DEVS);
qemu_set_irq(pci_irqs[irq_num], level);
}
--
2.27.0
- [PATCH] hw/ppc/ppc4xx_pci: Fix ppc4xx_pci_map_irq() for recent Linux kernels,
Thomas Huth <=