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hw/ppc/ppc4xx_pci: Fix ppc4xx_pci_map_irq() for recent Linux kernels

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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>
Message-Id: <20211019091817.469003-1-thuth@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Thomas Huth 2021-10-19 11:18:17 +02:00 committed by David Gibson
parent cedf706956
commit 6f9e8515c1
1 changed files with 5 additions and 3 deletions
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8
hw/ppc/ppc4xx_pci.c
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@ -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);
}