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libqos: Add 64-bit PCI IO accessors

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Currently the libqos PCI layer includes accessor helpers for 8, 16 and 32
bit reads and writes.  It's likely that we'll want 64-bit accesses in the
future (plenty of modern peripherals will have 64-bit reigsters).  This
adds them.

For PIO (not MMIO) accesses on the PC backend, this is implemented as two
32-bit ins or outs.  That's not ideal but AFAICT x86 doesn't have 64-bit
versions of in and out.

This patch also converts the single current user of 64-bit accesses -
virtio-pci.c to use the new mechanism, rather than a sequence of 8 byte
reads.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
This commit is contained in:
David Gibson 2016-10-19 15:00:21 +11:00
parent 9c268f8ae8
commit f775f45ab8
5 changed files with 60 additions and 12 deletions
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16
tests/libqos/virtio-pci.c
View file

@ -106,22 +106,14 @@ static uint32_t qvirtio_pci_config_readl(QVirtioDevice *d, uint64_t off)
static uint64_t qvirtio_pci_config_readq(QVirtioDevice *d, uint64_t off)
{
QVirtioPCIDevice *dev = (QVirtioPCIDevice *)d;
int i;
uint64_t u64 = 0;
uint64_t val;
val = qpci_io_readq(dev->pdev, CONFIG_BASE(dev) + off);
if (qvirtio_is_big_endian(d)) {
for (i = 0; i < 8; ++i) {
u64 |= (uint64_t)qpci_io_readb(dev->pdev, CONFIG_BASE(dev)
+ off + i) << (7 - i) * 8;
}
} else {
for (i = 0; i < 8; ++i) {
u64 |= (uint64_t)qpci_io_readb(dev->pdev, CONFIG_BASE(dev)
+ off + i) << i * 8;
}
val = bswap64(val);
}
return u64;
return val;
}
static uint32_t qvirtio_pci_get_features(QVirtioDevice *d)