vitrio-pci.c: add virtio-pci transport support for Nuttx

1. only support pci modern device;
2. need the pci controller support MSI/MSI-X;
It has been verified based on virtio-rng and virtio-net.

Signed-off-by: Yongrong Wang <wangyongrong@xiaomi.com>
Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>

drivers/pci/pci_drivers.c

@@ -29,6 +29,7 @@
 #include <nuttx/pci/pci_qemu_test.h>
 #include <nuttx/rptun/rptun_ivshmem.h>
 #include <nuttx/rpmsg/rpmsg_virtio_ivshmem.h>
+#include <nuttx/virtio/virtio-pci.h>
 
 #include "pci_drivers.h"
 
@@ -103,6 +104,16 @@ int pci_register_drivers(void)
     }
 #endif
 
+  /* Initialization virtio pci driver */
+
+#ifdef CONFIG_DRIVERS_VIRTIO_PCI
+  ret = register_virtio_pci_driver();
+  if (ret < 0)
+    {
+      pcierr("register_virtio_pci_driver failed, ret=%d\n", ret);
+    }
+#endif
+
   UNUSED(ret);
   return ret;
 }

drivers/virtio/CMakeLists.txt

@@ -27,6 +27,10 @@ if(CONFIG_DRIVERS_VIRTIO_MMIO)
   list(APPEND SRCS virtio-mmio.c)
 endif()
 
+if(CONFIG_DRIVERS_VIRTIO_PCI)
+  list(APPEND SRCS virtio-pci.c)
+endif()
+
 if(CONFIG_DRIVERS_VIRTIO_BLK)
   list(APPEND SRCS virtio-blk.c)
 endif()

drivers/virtio/Kconfig

@@ -22,6 +22,10 @@ config DRIVERS_VIRTIO_MMIO_QUEUE_LEN
 		If this value equals to 0, use the max queue length get from
 		mmio register.
 
+config DRIVERS_VIRTIO_PCI
+	bool "Virtio PCI Device Support"
+	default n
+
 config DRIVERS_VIRTIO_BLK
 	bool "Virtio block support"
 	depends on !DISABLE_MOUNTPOINT

drivers/virtio/Make.defs

@@ -28,6 +28,10 @@ ifeq ($(CONFIG_DRIVERS_VIRTIO_MMIO),y)
   CSRCS += virtio-mmio.c
 endif
 
+ifeq ($(CONFIG_DRIVERS_VIRTIO_PCI),y)
+  CSRCS += virtio-pci.c
+endif
+
 ifeq ($(CONFIG_DRIVERS_VIRTIO_BLK),y)
   CSRCS += virtio-blk.c
 endif

include/nuttx/virtio/virtio-pci.h

@@ -0,0 +1,64 @@
+/****************************************************************************
+ * include/nuttx/virtio/virtio-pci.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_VIRTIO_VIRTIO_PCI_H
+#define __INCLUDE_NUTTX_VIRTIO_VIRTIO_PCI_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdint.h>
+
+#ifdef CONFIG_DRIVERS_VIRTIO_PCI
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: register_virtio_pci_driver
+ ****************************************************************************/
+
+int register_virtio_pci_driver(void);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_DRIVERS_VIRTIO_PCI */
+#endif /* __INCLUDE_NUTTX_VIRTIO_VIRTIO_PCI_H */