replace alloc/free with struct members.
todo: smash with initial implementation after
testing.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Support bridge filtering on top of the memory
API as suggested by Avi Kivity:

Create a memory region for the bridge's address space.  This region is
not directly added to system_memory or its descendants.  Devices under
the bridge see this region as its pci_address_space().  The region is
as large as the entire address space - it does not take into account
any windows.

For each of the three windows (pref, non-pref, vga), create an alias
with the appropriate start and size.  Map the alias into the bridge's
parent's pci_address_space(), as subregions.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

The switch to the new memory API caused the following problem:

The pci device may call pci_register_bar() to use PCI bus's address
space.  But we don't init PCI bus's address space if it is not bus
0.  A crash was reported:
http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg02243.html

More work will be needed to make bridge filtering work correctly
with the memory API.
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Trigger secondary bus reset when secondary bus reset bit
value changes from 0 to 1.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Extract range functions from pci.h. These will be used by later patches
by non-PCI devices. Adjust current users.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
(cherry picked from commit bf1b0071)

The lower bits of base/limit registers is RO and shouldn't be zero
cleared on reset. This patch fixes it.
In fact, the default value of base/limit registers aren't specified
in the spec. And some bridges disable forwarding on reset instead of
zeroing base/limit registers.
So introduce one function to disable bridge forwarding so that
such bridges can use it. It will be used later.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

helper function to add ssvid capability.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

introduce pci bridge library.
convert apb bridge and dec p2p bridge to use new pci bridge library.
save/restore is supported as a side effect.
This is also preparation for pci express root/upstream/downstream port.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Remove pci_{register, unregister}_secondary_bus() by open code.
They are old stype API and aren't used any more by others. So eliminate it.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

To avoid confusion of primary bus with secondary bus,
rename PCIBridge::bus to PCIBridge::sec_bus.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

Move pci bridge related code into pci_bridge.c from pci.c
for further enhancement. pci.c is big enough now, so split it out.
No code change but exporting some accesser functions.

In fact, few pci bridge functions stays in pci.c.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>