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hw/pci: partially handle pci master abort

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A MemoryRegion with negative priority was created and
it spans over all the pci address space.
It "intercepts" the accesses to unassigned pci
address space and will follow the pci spec:
 1. returns -1 on read
 2. does nothing on write

Note: setting the RECEIVED MASTER ABORT bit in the STATUS register
      of the device that initiated the transaction will be
      implemented in another series

Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2013-09-16 11:21:16 +03:00 committed by Michael S. Tsirkin
parent 8002ccd6e4
commit a53ae8e934
2 changed files with 27 additions and 0 deletions
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26
hw/pci/pci.c
View File

@ -283,6 +283,24 @@ const char *pci_root_bus_path(PCIDevice *dev)
return rootbus->qbus.name;
}
static uint64_t master_abort_mem_read(void *opaque, hwaddr addr, unsigned size)
{
return -1ULL;
}
static void master_abort_mem_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
}
static const MemoryRegionOps master_abort_mem_ops = {
.read = master_abort_mem_read,
.write = master_abort_mem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
#define MASTER_ABORT_MEM_PRIORITY INT_MIN
static void pci_bus_init(PCIBus *bus, DeviceState *parent,
const char *name,
MemoryRegion *address_space_mem,
@ -294,6 +312,14 @@ static void pci_bus_init(PCIBus *bus, DeviceState *parent,
bus->address_space_mem = address_space_mem;
bus->address_space_io = address_space_io;
memory_region_init_io(&bus->master_abort_mem, OBJECT(bus),
&master_abort_mem_ops, bus, "pci-master-abort",
memory_region_size(bus->address_space_mem));
memory_region_add_subregion_overlap(bus->address_space_mem,
0, &bus->master_abort_mem,
MASTER_ABORT_MEM_PRIORITY);
/* host bridge */
QLIST_INIT(&bus->child);

1
include/hw/pci/pci_bus.h
View File

@ -23,6 +23,7 @@ struct PCIBus {
PCIDevice *parent_dev;
MemoryRegion *address_space_mem;
MemoryRegion *address_space_io;
MemoryRegion master_abort_mem;
QLIST_HEAD(, PCIBus) child; /* this will be replaced by qdev later */
QLIST_ENTRY(PCIBus) sibling;/* this will be replaced by qdev later */