CHROMIUM: virtwl: add virtwl driver

TEST=emerge-tatl chromeos-kernel-4_4
BUG=chromium:738638

[dgreid - conflicts with Makefile and find_vqs function + clean
checkpatch.pl run]

Change-Id: I6e8e128a5548c915a9561938cbb066edc8c42747
Reviewed-on: https://chromium-review.googlesource.com/567299
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/780812
Commit-Ready: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>

Conflicts:
	drivers/virtio/Kconfig

[rebase419(groeck): Context conflicts; squash with fixup patch;
	kernel API change: sys_close -> ksys_close]
Signed-off-by: Guenter Roeck <groeck@chromium.org>
[rebase54(groeck): Context conflicts; squashed patches:
	CHROMIUM: virtwl: fix incorrect list_for_each_entry_safe usage
	CHROMIUM: virtwl: fix deadlock while receiving VFDs
	CHROMIUM: virtwl: change VIRTWL_SEND_MAX_ALLOCS to match libwayland
	CHROMIUM: virtwl: add compat_ioctl entry for each struct file_operations
	CHROMIUM: virtwl: use compat_ptr in compat_ioctl implementations
	CHROMIUM: virtwl: remove unneeded access_checks in ioctls
	CHROMIUM: virtwl: check for CONFIG_COMPAT before defining compat ioctl
	CHROMIUM: virtwl: fix asterisk placement around __user
	CHROMIUM: virtwl: properly free qentries that are empty
	CHROMIUM: virtwl: add pipe vfd support
	CHROMIUM: virtwl: add dmabuf vfd support
	CHROMIUM: virtwl: fix double free in error path for virtwl_ioctl_recv
	CHROMIUM: virtwl: add dmabuf sync ioctl
	CHROMIUM: virtio/wl: Fix locking order in do_new()
	CHROMIUM: virtio/wl: Fix a missing mutex unlock in error path
	CHROMIUM: virtio/wl: Unlock vfd->lock before freeing it
	CHROMIUM: virtio/wl: Always update *vfd_count on recv, if given
	CHROMIUM: virtwl: send foreign id support
	CHROMIUM: virtwl: fix dma_buf_get() retval handling
	CHROMIUM: virtwl: Kick the in virtqueue in virtwl_vfd_remove()
	CHROMIUM: virtwl: Fix possible deadlocks.
	CHROMIUM: virtwl: fix descriptor sizes for close, dmabuf_sync
	Revert "CHROMIUM: virtwl: Fix possible deadlocks."
]
Signed-off-by: Guenter Roeck <groeck@chromium.org>
[rebase510(groeck): Context conflicts;
    Squashed:
	CHROMIUM: virtio: Accept new IDs for ChromeOS-specific devices
	CHROMIUM: virtwl: Support multiple host sockets
	CHROMIUM: virtio: Remove deprecated IDs for ChromeOS-specific devices
	CHROMIUM: virtwl: use virtio_dma_buf_get_uuid to get resid
]
Signed-off-by: Guenter Roeck <groeck@chromium.org>

Signed-off-by: Richard Fung <richardfung@google.com>
Change-Id: Ib95fc6edc1ffab3cb9d274d8ad65687d3d564606

drivers/virtio/Kconfig

@@ -148,4 +148,12 @@ config VIRTIO_DMA_SHARED_BUFFER
 	 This option adds a flavor of dma buffers that are backed by
 	 virtio resources.
 
+config VIRTIO_WL
+	bool "Virtio Wayland driver"
+	depends on VIRTIO
+	help
+	 This driver supports proxying of a wayland socket from host to guest.
+
+	 If unsure, say 'N'.
+
 endif # VIRTIO_MENU

drivers/virtio/Makefile

@@ -10,3 +10,4 @@ obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o
 obj-$(CONFIG_VIRTIO_VDPA) += virtio_vdpa.o
 obj-$(CONFIG_VIRTIO_MEM) += virtio_mem.o
 obj-$(CONFIG_VIRTIO_DMA_SHARED_BUFFER) += virtio_dma_buf.o
+obj-$(CONFIG_VIRTIO_WL) += virtio_wl.o