virtio: add API for VIRTIO devices and add VIRTIO PCI driver

This commit adds the API for accessing VIRTIO devices, and adds a driver
for a VIRTIO PCIE device based on the newly added API.

This commit is based on the Virtual I/O Device (VIRTIO) Version 1.3
specification:
https://docs.oasis-open.org/virtio/virtio/v1.3/csd01/virtio-v1.3-csd01.pdf

Signed-off-by: Jakub Michalski <jmichalski@antmicro.com>
Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com>

Author: jmichalski-ant

MAINTAINERS.yml

@@ -2176,6 +2176,20 @@ Release Notes:
   tests:
     - drivers.video
 
+"Drivers: VIRTIO":
+  status: maintained
+  maintainers:
+    - fkokosinski
+    - tgorochowik
+  collaborators:
+    - kgugala
+  files:
+    - drivers/virtio/
+    - dts/bindings/virtio/
+    - include/zephyr/virtio/
+  labels:
+    - "area: VIRTIO"
+
 "Drivers: W1":
   status: maintained
   maintainers:

drivers/CMakeLists.txt

@@ -89,6 +89,7 @@ add_subdirectory_ifdef(CONFIG_SYSCON syscon)
 add_subdirectory_ifdef(CONFIG_SYS_CLOCK_EXISTS timer)
 add_subdirectory_ifdef(CONFIG_TEE tee)
 add_subdirectory_ifdef(CONFIG_VIDEO video)
+add_subdirectory_ifdef(CONFIG_VIRTIO virtio)
 add_subdirectory_ifdef(CONFIG_VIRTUALIZATION virtualization)
 add_subdirectory_ifdef(CONFIG_W1 w1)
 add_subdirectory_ifdef(CONFIG_WATCHDOG watchdog)

drivers/Kconfig

@@ -88,6 +88,7 @@ source "drivers/timer/Kconfig"
 source "drivers/usb/Kconfig"
 source "drivers/usb_c/Kconfig"
 source "drivers/video/Kconfig"
+source "drivers/virtio/Kconfig"
 source "drivers/virtualization/Kconfig"
 source "drivers/w1/Kconfig"
 source "drivers/watchdog/Kconfig"

drivers/virtio/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (c) 2024 Antmicro <www.antmicro.com>
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+
+zephyr_library_sources_ifdef(CONFIG_VIRTIO virtqueue.c)
+zephyr_library_sources_ifdef(CONFIG_VIRTIO_PCI virtio_pci.c)

drivers/virtio/Kconfig

@@ -0,0 +1,22 @@
+# Copyright (c) 2024 Antmicro <www.antmicro.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config VIRTIO
+	bool "support for VIRTIO"
+	help
+	  Enable options for VIRTIO
+
+if VIRTIO
+
+config VIRTIO_PCI
+	bool "support for VIRTIO over PCI"
+	default y
+	depends on DT_HAS_VIRTIO_PCI_ENABLED
+	help
+	  Enable options for VIRTIO over PCI
+
+endif # VIRTIO
+
+module = VIRTIO
+module-str = VIRTIO
+source "subsys/logging/Kconfig.template.log_config"