This function help Xen PCI Passthrough device to check for overlap.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
hw/pci.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
hw/pci.h | 3 +++
2 files changed, 49 insertions(+), 0 deletions(-)
diff --git a/hw/pci.c b/hw/pci.c
index af74003..56e94d1 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -2196,3 +2196,49 @@ MemoryRegion *pci_address_space(PCIDevice *dev)
{
return dev->bus->address_space_mem;
}
+
+int pci_check_bar_overlap(PCIDevice *dev,
+ pcibus_t addr, pcibus_t size, uint8_t type)
+{
+ PCIBus *bus = dev->bus;
+ PCIDevice *devices = NULL;
+ PCIIORegion *r;
+ int i, j;
+ int rc = 0;
+
+ /* check Overlapped to Base Address */
+ for (i = 0; i < ARRAY_SIZE(bus->devices); i++) {
+ if (!(devices = bus->devices[i])) {
+ continue;
+ }
+
+ /* skip itself */
+ if (devices->devfn == dev->devfn) {
+ continue;
+ }
+
+ for (j = 0; j < PCI_NUM_REGIONS; j++) {
+ r = &devices->io_regions[j];
+
+ /* skip different resource type, but don't skip when
+ * prefetch and non-prefetch memory are compared.
+ */
+ if (type != r->type) {
+ if (type == PCI_BASE_ADDRESS_SPACE_IO ||
+ r->type == PCI_BASE_ADDRESS_SPACE_IO) {
+ continue;
+ }
+ }
+
+ if ((addr < (r->addr + r->size)) && ((addr + size) > r->addr)) {
+ printf("Overlapped to device[%02x:%02x.%x][Region:%d]"
+ "[Address:%"PRIx64"h][Size:%"PRIx64"h]\n",
+ pci_bus_num(bus), PCI_SLOT(devices->devfn),
+ PCI_FUNC(devices->devfn), j, r->addr, r->size);
+ rc = 1;
+ }
+ }
+ }
+
+ return rc;
+}
diff --git a/hw/pci.h b/hw/pci.h
index c04b169..97996b5 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -490,4 +490,7 @@ static inline uint32_t pci_config_size(const PCIDevice *d)
return pci_is_express(d) ? PCIE_CONFIG_SPACE_SIZE : PCI_CONFIG_SPACE_SIZE;
}
+int pci_check_bar_overlap(PCIDevice *dev,
+ pcibus_t addr, pcibus_t size, uint8_t type);
+
#endif
--
Anthony PERARD
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