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[Qemu-devel] [PATCH v4 2/3] pci: add QEMU-specific PCI capability struct
From: |
Aleksandr Bezzubikov |
Subject: |
[Qemu-devel] [PATCH v4 2/3] pci: add QEMU-specific PCI capability structure |
Date: |
Sat, 5 Aug 2017 23:29:53 +0300 |
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 <address@hidden>
---
src/fw/dev-pci.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 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..2c8ddb0
--- /dev/null
+++ b/src/fw/dev-pci.h
@@ -0,0 +1,50 @@
+#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 structure 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_CAP_TYP_QEMU=1 exists
+Data:
+
+u32 bus_res; minimum bus number to reserve;
+ this is necessary for PCI Express Root Ports
+ to support PCIE-to-PCI bridge hotplug
+u64 io; IO space to reserve
+u64 mem; non-prefetchable memory space to reserve
+u64 prefetchable_mem; prefetchable memory space to reserve
+
+If any field value in Data section is -1,
+it means that such kind of reservation
+is not needed and must be ignored.
+
+*/
+
+/* Offset of vendor-specific capability type field */
+#define PCI_CAP_REDHAT_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_BUS_RES 4
+#define QEMU_PCI_CAP_LIMITS_OFFSET 8
+#define QEMU_PCI_CAP_IO 8
+#define QEMU_PCI_CAP_MEM 16
+#define QEMU_PCI_CAP_PREF_MEM 24
+#define QEMU_PCI_CAP_SIZE 32
+
+#endif /* _PCI_CAP_H */
--
2.7.4