On PCI init PCI bridge devices may need some extra info about bus number to reserve, IO, memory and prefetchable memory limits. QEMU can provide this with special vendor-specific PCI capability.
This capability is intended to be used only for Red Hat PCI bridges, i.e. QEMU cooperation.
Signed-off-by: Aleksandr Bezzubikov zuban32s@gmail.com --- src/fw/dev-pci.h | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 src/fw/dev-pci.h
diff --git a/src/fw/dev-pci.h b/src/fw/dev-pci.h new file mode 100644 index 0000000..fbd49ed --- /dev/null +++ b/src/fw/dev-pci.h @@ -0,0 +1,62 @@ +#ifndef _PCI_CAP_H +#define _PCI_CAP_H + +#include "types.h" + +/* + +QEMU-specific vendor(Red Hat)-specific capability. +It's intended to provide some hints for firmware to init PCI devices. + +Its is shown below: + +Header: + +u8 id; Standard PCI Capability Header field +u8 next; Standard PCI Capability Header field +u8 len; Standard PCI Capability Header field +u8 type; Red Hat vendor-specific capability type: + now only REDHAT_QEMU_CAP 1 exists +Data: + +u16 non_prefetchable_16; non-prefetchable memory limit + +u8 bus_res; minimum bus number to reserve; + this is necessary for PCI Express Root Ports + to support PCIE-to-PCI bridge hotplug + +u8 io_8; IO limit in case of 8-bit limit value +u32 io_32; IO limit in case of 16-bit limit value + io_8 and io_16 are mutually exclusive, in other words, + they can't be non-zero simultaneously + +u32 prefetchable_32; non-prefetchable memory limit + in case of 32-bit limit value +u64 prefetchable_64; non-prefetchable memory limit + in case of 64-bit limit value + prefetachable_32 and prefetchable_64 are + mutually exclusive, in other words, + they can't be non-zero simultaneously +If any field in Data section is 0, +it means that such kind of reservation +is not needed. + +*/ + +/* Offset of vendor-specific capability type field */ +#define PCI_CAP_VNDR_SPEC_TYPE 3 + +/* List of valid Red Hat vendor-specific capability types */ +#define REDHAT_CAP_TYPE_QEMU 1 + + +/* Offsets of QEMU capability fields */ +#define QEMU_PCI_CAP_NON_PREF 4 +#define QEMU_PCI_CAP_BUS_RES 6 +#define QEMU_PCI_CAP_IO_8 7 +#define QEMU_PCI_CAP_IO_32 8 +#define QEMU_PCI_CAP_PREF_32 12 +#define QEMU_PCI_CAP_PREF_64 16 +#define QEMU_PCI_CAP_SIZE 24 + +#endif /* _PCI_CAP_H */