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Re: [Qemu-devel] [PATCH 6/7] s390: sclp ascii console support
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] [PATCH 6/7] s390: sclp ascii console support |
Date: |
Tue, 24 Jul 2012 19:42:59 +0000 |
On Tue, Jul 24, 2012 at 7:37 AM, Christian Borntraeger
<address@hidden> wrote:
> From: Heinz Graalfs <address@hidden>
>
> This code adds console support by implementing SCLP's ASCII Console
> Data event. This is the same console as LPARs ASCII console or z/VMs
> sysascii.
>
> The console can be specified manually with something like
> -chardev stdio,id=charconsole0 -device
> sclpconsole,chardev=charconsole0,id=console0
>
> Newer kernels will autodetect that console and prefer that over virtio
> console.
>
> When data is received from the character layer it creates a service
> interrupt to trigger a Read Event Data command from the guest that will
> pick up the received character byte-stream.
> When characters are echo'ed by the linux guest a Write Event Data occurs
> which is forwarded by the Event Facility to the console that supports
> a corresponding mask value.
> Console resizing is not supported.
> The character layer byte-stream is buffered using a fixed size iov
> buffer.
>
> Signed-off-by: Heinz Graalfs <address@hidden>
> Signed-off-by: Christian Borntraeger <address@hidden>
> ---
> hw/s390x/Makefile.objs | 2 +-
> hw/s390x/sclpconsole.c | 323
> ++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 324 insertions(+), 1 deletions(-)
> create mode 100644 hw/s390x/sclpconsole.c
>
> diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
> index ed4e61a..096dfcd 100644
> --- a/hw/s390x/Makefile.objs
> +++ b/hw/s390x/Makefile.objs
> @@ -3,4 +3,4 @@ obj-y = s390-virtio-bus.o s390-virtio.o
> obj-y := $(addprefix ../,$(obj-y))
> obj-y += sclp.o
> obj-y += event-facility.o
> -obj-y += sclpquiesce.o
> +obj-y += sclpquiesce.o sclpconsole.o
> diff --git a/hw/s390x/sclpconsole.c b/hw/s390x/sclpconsole.c
> new file mode 100644
> index 0000000..9a57032
> --- /dev/null
> +++ b/hw/s390x/sclpconsole.c
> @@ -0,0 +1,323 @@
> +/*
> + * SCLP event type
> + * Ascii Console Data (VT220 Console)
> + *
> + * Copyright IBM, Corp. 2012
> + *
> + * Authors:
> + * Heinz Graalfs <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> your
> + * option) any later version. See the COPYING file in the top-level
> directory.
> + *
> + */
> +
> +#include <hw/qdev.h>
> +#include "qemu-thread.h"
> +
> +#include "sclp.h"
> +#include "event-facility.h"
> +
> +typedef struct ASCIIConsoleData {
> + EventBufferHeader ebh;
> + char data[0];
> +} QEMU_PACKED ASCIIConsoleData;
> +
> +qemu_irq sclp_read_vt220;
This should go into SCLPConsole.
> +
> +/* max size for ASCII data in 4K SCCB page */
> +#define SIZE_BUFFER_VT220 4080
> +
> +typedef struct SCLPConsole {
> + SCLPEvent event;
> + CharDriverState *chr;
> + /* io vector */
> + uint8_t *iov; /* iov buffer pointer */
> + uint8_t *iov_sclp; /* pointer to SCLP read offset */
> + uint8_t *iov_bs; /* pointer byte stream read offset */
> + uint32_t iov_data_len; /* length of byte stream in buffer */
> + uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP */
> +} SCLPConsole;
> +
> +/* character layer call-back functions */
> +
> +/* Return number of bytes that fit into iov buffer */
> +static int chr_can_read(void *opaque)
> +{
> + int can_read;
> + SCLPConsole *scon = opaque;
> +
> + qemu_mutex_lock(&scon->event.lock);
> + can_read = SIZE_BUFFER_VT220 - scon->iov_data_len;
> + qemu_mutex_unlock(&scon->event.lock);
> +
> + return can_read;
> +}
> +
> +/* Receive n bytes from character layer, save in iov buffer,
> + * and set event pending */
> +static void receive_from_chr_layer(void *opaque, const uint8_t *buf, int
> size)
> +{
> + SCLPConsole *scon = opaque;
> +
> + assert(scon->iov);
> +
> + qemu_mutex_lock(&scon->event.lock);
> +
> + /* if new data do not fit into current buffer */
> + if (scon->iov_data_len + size > SIZE_BUFFER_VT220) {
> + /* character layer sent more than allowed */
> + qemu_mutex_unlock(&scon->event.lock);
> + return;
> + }
> + /* put byte-stream from character layer into buffer */
> + memcpy(scon->iov_bs, buf, size);
> + scon->iov_data_len += size;
> + scon->iov_sclp_rest += size;
> + scon->iov_bs += size;
> + scon->event.event_pending = true;
> +
> + qemu_mutex_unlock(&scon->event.lock);
> +}
> +
> +/* Send data from a char device over to the guest */
> +static void chr_read(void *opaque, const uint8_t *buf, int size)
> +{
> + assert(opaque);
> +
I'd convert the opaque to SCLPConsole here and use that for
receive_from_chr_layer() instead of opaque.
> + receive_from_chr_layer(opaque, buf, size);
> + /* trigger SCLP read operation */
> + qemu_irq_raise(sclp_read_vt220);
> +}
> +
> +static void chr_event(void *opaque, int event)
> +{
> + SCLPConsole *scon = opaque;
> +
> + switch (event) {
> + case CHR_EVENT_OPENED:
> + if (!scon->iov) {
> + scon->iov = g_malloc0(SIZE_BUFFER_VT220);
> + scon->iov_sclp = scon->iov;
> + scon->iov_bs = scon->iov;
> + scon->iov_data_len = 0;
> + scon->iov_sclp_rest = 0;
> + }
> + break;
> + case CHR_EVENT_CLOSED:
> + if (scon->iov) {
> + g_free(scon->iov);
> + scon->iov = NULL;
> + }
> + break;
> + }
> +}
> +
> +/* functions to be called by event facility */
> +
> +static int event_type(void)
> +{
> + return SCLP_EVENT_ASCII_CONSOLE_DATA;
> +}
> +
> +static unsigned int send_mask(void)
> +{
> + return SCLP_EVENT_MASK_MSG_ASCII;
> +}
> +
> +static unsigned int receive_mask(void)
> +{
> + return SCLP_EVENT_MASK_MSG_ASCII;
> +}
> +
> +/* triggered by SCLP's read_event_data -
> + * copy console data byte-stream into provided (SCLP) buffer
> + */
> +static void get_console_data(SCLPEvent *event, uint8_t *buf, size_t *size,
> + int avail)
> +{
> + SCLPConsole *cons = DO_UPCAST(SCLPConsole, event, event);
> +
> + /* first byte is hex 0 saying an ascii string follows */
> + *buf++ = '\0';
> + avail--;
> + /* if all data fit into provided SCLP buffer */
> + if (avail >= cons->iov_sclp_rest) {
> + /* copy character byte-stream to SCLP buffer */
> + memcpy(buf, cons->iov_sclp, cons->iov_sclp_rest);
> + *size = cons->iov_sclp_rest + 1;
> + cons->iov_sclp = cons->iov;
> + cons->iov_bs = cons->iov;
> + cons->iov_data_len = 0;
> + cons->iov_sclp_rest = 0;
> + event->event_pending = false;
> + /* data provided and no more data pending */
> + } else {
> + /* if provided buffer is too small, just copy part */
> + memcpy(buf, cons->iov_sclp, avail);
> + *size = avail + 1;
> + cons->iov_sclp_rest -= avail;
> + cons->iov_sclp += avail;
> + /* more data pending */
> + }
> +}
> +
> +static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
> + int *slen)
> +{
> + int avail;
> + size_t src_len;
> + uint8_t *to;
> + ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
> +
> + qemu_mutex_lock(&event->lock);
> +
> + if (!event->event_pending) {
> + /* no data pending */
> + qemu_mutex_unlock(&event->lock);
> + return 0;
> + }
> +
> + to = (uint8_t *)&acd->data;
> + avail = *slen - sizeof(ASCIIConsoleData);
> + get_console_data(event, to, &src_len, avail);
> +
> + acd->ebh.length = cpu_to_be16(sizeof(ASCIIConsoleData) + src_len);
> + acd->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
> + acd->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
> + *slen = avail - src_len;
> +
> + qemu_mutex_unlock(&event->lock);
> +
> + return 1;
> +}
> +
> +/* triggered by SCLP's write_event_data
> + * - write console data into character layer
> + * returns < 0 if an error occured
> + */
> +static ssize_t write_console_data(SCLPEvent *event, const uint8_t *buf,
> + size_t len)
> +{
> + ssize_t ret = 0;
> + const uint8_t *iov_offset;
> + SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
> +
> + if (!scon->chr) {
> + /* If there's no backend, we can just say we consumed all data. */
> + return len;
> + }
> +
> + iov_offset = buf;
> + while (len > 0) {
> + ret = qemu_chr_fe_write(scon->chr, buf, len);
> + if (ret == 0) {
> + /* a pty doesn't seem to be connected - no error */
> + len = 0;
> + } else if (ret == -EAGAIN || (ret > 0 && ret < len)) {
> + len -= ret;
> + iov_offset += ret;
> + } else {
> + len = 0;
> + }
> + }
> +
> + return ret;
> +}
> +
> +static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr)
> +{
> + int rc;
> + int length;
> + ssize_t written;
> + ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
> +
> + length = be16_to_cpu(evt_buf_hdr->length) - sizeof(EventBufferHeader);
> + written = write_console_data(event, (uint8_t *)acd->data, length);
> +
> + rc = SCLP_RC_NORMAL_COMPLETION;
> + /* set event buffer accepted flag */
> + evt_buf_hdr->flags |= SCLP_EVENT_BUFFER_ACCEPTED;
> +
> + /* written will be zero if a pty is not connected - don't treat as error
> */
> + if (written < 0) {
> + /* event buffer not accepted due to error in character layer */
> + evt_buf_hdr->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
> + rc = SCLP_RC_CONTAINED_EQUIPMENT_CHECK;
> + }
> +
> + return rc;
> +}
> +
> +static void trigger_ascii_console_data(void *env, int n, int level)
> +{
> + sclp_service_interrupt(0);
> +}
> +
> +/* qemu object creation and initialization functions */
> +
> +/* tell character layer our call-back functions */
> +static int console_init(SCLPEvent *event)
> +{
> + static bool console_available;
> +
> + SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
> +
> + if (console_available) {
> + error_report("Multiple VT220 operator consoles are not supported");
> + return -1;
> + }
> + console_available = true;
> + event->event_type = SCLP_EVENT_ASCII_CONSOLE_DATA;
> + if (scon->chr) {
> + qemu_chr_add_handlers(scon->chr, chr_can_read,
> + chr_read, chr_event, scon);
> + }
> + sclp_read_vt220 = *qemu_allocate_irqs(trigger_ascii_console_data,
> + NULL, 1);
> +
> + qemu_mutex_init(&event->lock);
> +
> + return 0;
> +}
> +
> +static int console_exit(SCLPEvent *event)
> +{
> + qemu_mutex_destroy(&event->lock);
> +
> + return 0;
> +}
> +
> +static Property console_properties[] = {
> + DEFINE_PROP_CHR("chardev", SCLPConsole, chr),
> + DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void console_class_init(ObjectClass *klass, void *data)
> +{
> + DeviceClass *dc = DEVICE_CLASS(klass);
> + SCLPEventClass *ec = SCLP_EVENT_CLASS(klass);
> +
> + dc->props = console_properties;
> + ec->init = console_init;
> + ec->exit = console_exit;
> + ec->get_send_mask = send_mask;
> + ec->get_receive_mask = receive_mask;
> + ec->event_type = event_type;
> + ec->read_event_data = read_event_data;
> + ec->write_event_data = write_event_data;
> +}
> +
> +static TypeInfo sclp_console_info = {
> + .name = "sclpconsole",
> + .parent = TYPE_SCLP_EVENT,
> + .instance_size = sizeof(SCLPConsole),
> + .class_init = console_class_init,
> + .class_size = sizeof(SCLPEventClass),
> +};
> +
> +static void register_types(void)
> +{
> + type_register_static(&sclp_console_info);
> +}
> +type_init(register_types)
> --
> 1.7.0.1
>
- [Qemu-devel] [PATCH v4 07/07] s390: make sclp ascii console the default, (continued)
[Qemu-devel] [PATCH 4/7] s390: sclp event support, Christian Borntraeger, 2012/07/24
Re: [Qemu-devel] [PATCH 4/7] s390: sclp event support, Andreas Färber, 2012/07/31
[Qemu-devel] [PATCH 6/7] s390: sclp ascii console support, Christian Borntraeger, 2012/07/24
- Re: [Qemu-devel] [PATCH 6/7] s390: sclp ascii console support,
Blue Swirl <=
[Qemu-devel] [PATCH 5/7] s390: sclp signal quiesce support, Christian Borntraeger, 2012/07/24
[Qemu-devel] [PATCH 3/7] s390: sclp base support, Christian Borntraeger, 2012/07/24
[Qemu-devel] [PATCH 1/7] s390: Fix error handling and condition code of service call, Christian Borntraeger, 2012/07/24
[Qemu-devel] [PATCH 2/7] s390: provide interface for service interrupt/introduce interrupt.c, Christian Borntraeger, 2012/07/24
Re: [Qemu-devel] [PATCH 0/7v3] s390: sclp patch set, Christian Borntraeger, 2012/07/30