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sysbus: always allow explicit_ofw_unit_address() to override address generation

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Some SysBusDevices either use sysbus_init_mmio() without
sysbus_mmio_map() or the first MMIO memory region doesn't represent the
bus address, causing a firmware device path with an invalid address to
be generated.

SysBusDeviceClass does provide a virtual explicit_ofw_unit_address()
method that can be used to override this process, but it was originally intended
only as as a fallback option meaning that any existing MMIO memory regions still
take priority whilst determining the firmware device address.

There is currently only one user of explicit_ofw_unit_address() and that
is the PCI expander bridge (PXB) device which has no MMIO/PIO resources
defined. This enables us to allow explicit_ofw_unit_address() to take
priority without affecting backwards compatibility, allowing the address
to be customised as required.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20180805112850.26063-2-mark.cave-ayland@ilande.co.uk>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Mark Cave-Ayland 2018-08-05 12:28:49 +01:00 committed by Eduardo Habkost
parent 3aeaac8fa2
commit be64d7776b
1 changed files with 7 additions and 8 deletions
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15
hw/core/sysbus.c
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@ -293,16 +293,8 @@ static char *sysbus_get_fw_dev_path(DeviceState *dev)
{
SysBusDevice *s = SYS_BUS_DEVICE(dev);
SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(s);
/* for the explicit unit address fallback case: */
char *addr, *fw_dev_path;
if (s->num_mmio) {
return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
s->mmio[0].addr);
}
if (s->num_pio) {
return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
}
if (sbc->explicit_ofw_unit_address) {
addr = sbc->explicit_ofw_unit_address(s);
if (addr) {
@ -311,6 +303,13 @@ static char *sysbus_get_fw_dev_path(DeviceState *dev)
return fw_dev_path;
}
}
if (s->num_mmio) {
return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
s->mmio[0].addr);
}
if (s->num_pio) {
return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
}
return g_strdup(qdev_fw_name(dev));
}