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Commit 1c6264cc authored by Pranavkumar Sawargaonkar's avatar Pranavkumar Sawargaonkar Committed by Rusty Russell
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virtio: console: Add emergency writeonly register to config space 



This patch adds an emerg_wr register (writeonly) in config space
of virtio console device which can be used for debugging.

Signed-off-by: default avatarPranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: default avatarAnup Patel <anup.patel@linaro.org>
Acked-by: default avatarAmit Shah <amit.shah@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 8b21ab14

include/uapi/linux/virtio_console.h

+3 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
/* Feature bits */

#define VIRTIO_CONSOLE_F_SIZE	0	/* Does host provide console size? */

#define VIRTIO_CONSOLE_F_MULTIPORT 1	/* Does host provide multiple ports? */

#define VIRTIO_CONSOLE_F_EMERG_WRITE 2 /* Does host support emergency write? */



#define VIRTIO_CONSOLE_BAD_ID		(~(u32)0)
@@ -48,6 +49,8 @@ struct virtio_console_config { 
	__u16 rows;

	/* max. number of ports this device can hold */

	__u32 max_nr_ports;

	/* emergency write register */

	__u32 emerg_wr;

} __attribute__((packed));



/*