From mboxrd@z Thu Jan 1 00:00:00 1970 From: pranavkumar@linaro.org (Pranavkumar Sawargaonkar) Date: Mon, 6 May 2013 17:49:50 +0530 Subject: [PATCH V2 2/3] Documentation: virtio: Add emergency write (emerg_wr) config register in virtio console. In-Reply-To: <1367842791-30285-1-git-send-email-pranavkumar@linaro.org> References: <1367842791-30285-1-git-send-email-pranavkumar@linaro.org> Message-ID: <1367842791-30285-3-git-send-email-pranavkumar@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Signed-off-by: Pranavkumar Sawargaonkar Signed-off-by: Anup Patel --- Documentation/virtual/virtio-spec.txt | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/Documentation/virtual/virtio-spec.txt b/Documentation/virtual/virtio-spec.txt index 0d6ec85..3ca38f8 100644 --- a/Documentation/virtual/virtio-spec.txt +++ b/Documentation/virtual/virtio-spec.txt @@ -1927,11 +1927,16 @@ Ports 2 onwards only if VIRTIO_CONSOLE_F_MULTIPORT is set ports; configuration fields nr_ports and max_nr_ports are valid and control virtqueues will be used. + VIRTIO_CONSOLE_F_EMERG_WRITE(2) Device has support for emergency + write. Configuration filed emerg_wr is valid. + Device configuration layout The size of the console is supplied in the configuration space if the VIRTIO_CONSOLE_F_SIZE feature is set. Furthermore, if the VIRTIO_CONSOLE_F_MULTIPORT feature is set, the maximum number of ports supported by the device can - be fetched.struct virtio_console_config { + be fetched. If VIRTIO_CONSOLE_F_EMERG_WRITE is set then one can + use emergency write to output single character without initializing + virtio queues. struct virtio_console_config { u16 cols; @@ -1941,6 +1946,7 @@ Ports 2 onwards only if VIRTIO_CONSOLE_F_MULTIPORT is set u32 max_nr_ports; + u32 emerg_wr; }; Device Initialization -- 1.7.9.5