libqos: Add streaming accessors for PCI MMIO

Currently PCI memory (aka MMIO) space is accessed via a set of readb/writeb
style accessors.  This is what we want for accessing discrete registers of
a certain size.  However, there are a few cases where we instead need a
"bag of bytes" style streaming interface to PCI MMIO space.  This can be
either for streaming data style registers or when there's actual memory
rather than registers in PCI space, for example frame buffers or ivshmem.

This patch adds backend callbacks, and libqos wrappers for this type of
byte address order preserving accesses.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/libqos/pci-spapr.c b/tests/libqos/pci-spapr.c
index 70a24b5579..ad12c2e582 100644
--- a/tests/libqos/pci-spapr.c
+++ b/tests/libqos/pci-spapr.c
@@ -114,6 +114,20 @@ static void qpci_spapr_mmio32_writel(QPCIBus *bus, uint32_t addr, uint32_t val)
     writel(s->mmio32_cpu_base + addr, bswap32(val));
 }
 
+static void qpci_spapr_memread(QPCIBus *bus, uint32_t addr,
+                               void *buf, size_t len)
+{
+    QPCIBusSPAPR *s = container_of(bus, QPCIBusSPAPR, bus);
+    memread(s->mmio32_cpu_base + addr, buf, len);
+}
+
+static void qpci_spapr_memwrite(QPCIBus *bus, uint32_t addr,
+                                const void *buf, size_t len)
+{
+    QPCIBusSPAPR *s = container_of(bus, QPCIBusSPAPR, bus);
+    memwrite(s->mmio32_cpu_base + addr, buf, len);
+}
+
 static uint8_t qpci_spapr_config_readb(QPCIBus *bus, int devfn, uint8_t offset)
 {
     QPCIBusSPAPR *s = container_of(bus, QPCIBusSPAPR, bus);
@@ -188,6 +202,9 @@ QPCIBus *qpci_init_spapr(QGuestAllocator *alloc)
     ret->bus.mmio_writew = qpci_spapr_mmio32_writew;
     ret->bus.mmio_writel = qpci_spapr_mmio32_writel;
 
+    ret->bus.memread = qpci_spapr_memread;
+    ret->bus.memwrite = qpci_spapr_memwrite;
+
     ret->bus.config_readb = qpci_spapr_config_readb;
     ret->bus.config_readw = qpci_spapr_config_readw;
     ret->bus.config_readl = qpci_spapr_config_readl;