[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V4 06/10] pci.c: Add pci_check_bar_overlap
From: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx> This function help Xen PCI Passthrough device to check for overlap. Signed-off-by: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> --- hw/pci.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ hw/pci.h | 3 +++ 2 files changed, 50 insertions(+), 0 deletions(-) diff --git a/hw/pci.c b/hw/pci.c index 399227f..563bb37 100644 --- a/hw/pci.c +++ b/hw/pci.c @@ -2038,3 +2038,50 @@ MemoryRegion *pci_address_space_io(PCIDevice *dev) { return dev->bus->address_space_io; } + +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++) { + devices = bus->devices[i]; + if (!devices) { + 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 4b2e785..307fa13 100644 --- a/hw/pci.h +++ b/hw/pci.h @@ -550,4 +550,7 @@ static inline void pci_dma_sglist_init(QEMUSGList *qsg, PCIDevice *dev, qemu_sglist_init(qsg, alloc_hint); } +int pci_check_bar_overlap(PCIDevice *dev, + pcibus_t addr, pcibus_t size, uint8_t type); + #endif -- Anthony PERARD _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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