Currently all handlers (quiesce, console) only handle one event type. Some drivers will handle multiple (compatible) event types. Rework the code accordingly. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Alexander Graf <agraf@suse.de>
294 lines
8.1 KiB
C
294 lines
8.1 KiB
C
/*
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* SCLP event type
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* Ascii Console Data (VT220 Console)
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Heinz Graalfs <graalfs@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#include <hw/qdev.h>
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#include "qemu/thread.h"
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#include "qemu/error-report.h"
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#include "hw/s390x/sclp.h"
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#include "hw/s390x/event-facility.h"
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#include "sysemu/char.h"
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typedef struct ASCIIConsoleData {
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EventBufferHeader ebh;
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char data[0];
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} QEMU_PACKED ASCIIConsoleData;
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/* max size for ASCII data in 4K SCCB page */
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#define SIZE_BUFFER_VT220 4080
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typedef struct SCLPConsole {
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SCLPEvent event;
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CharDriverState *chr;
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uint8_t iov[SIZE_BUFFER_VT220];
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uint32_t iov_sclp; /* offset in buf for SCLP read operation */
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uint32_t iov_bs; /* offset in buf for char layer read operation */
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uint32_t iov_data_len; /* length of byte stream in buffer */
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uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP */
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qemu_irq irq_read_vt220;
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} SCLPConsole;
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/* character layer call-back functions */
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/* Return number of bytes that fit into iov buffer */
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static int chr_can_read(void *opaque)
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{
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SCLPConsole *scon = opaque;
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return SIZE_BUFFER_VT220 - scon->iov_data_len;
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}
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/* Receive n bytes from character layer, save in iov buffer,
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* and set event pending */
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static void receive_from_chr_layer(SCLPConsole *scon, const uint8_t *buf,
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int size)
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{
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/* read data must fit into current buffer */
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assert(size <= SIZE_BUFFER_VT220 - scon->iov_data_len);
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/* put byte-stream from character layer into buffer */
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memcpy(&scon->iov[scon->iov_bs], buf, size);
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scon->iov_data_len += size;
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scon->iov_sclp_rest += size;
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scon->iov_bs += size;
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scon->event.event_pending = true;
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}
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/* Send data from a char device over to the guest */
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static void chr_read(void *opaque, const uint8_t *buf, int size)
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{
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SCLPConsole *scon = opaque;
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assert(scon);
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receive_from_chr_layer(scon, buf, size);
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/* trigger SCLP read operation */
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qemu_irq_raise(scon->irq_read_vt220);
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}
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/* functions to be called by event facility */
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static bool can_handle_event(uint8_t type)
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{
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return type == SCLP_EVENT_ASCII_CONSOLE_DATA;
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}
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static unsigned int send_mask(void)
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{
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return SCLP_EVENT_MASK_MSG_ASCII;
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}
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static unsigned int receive_mask(void)
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{
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return SCLP_EVENT_MASK_MSG_ASCII;
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}
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/* triggered by SCLP's read_event_data -
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* copy console data byte-stream into provided (SCLP) buffer
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*/
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static void get_console_data(SCLPEvent *event, uint8_t *buf, size_t *size,
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int avail)
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{
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SCLPConsole *cons = DO_UPCAST(SCLPConsole, event, event);
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/* first byte is hex 0 saying an ascii string follows */
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*buf++ = '\0';
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avail--;
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/* if all data fit into provided SCLP buffer */
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if (avail >= cons->iov_sclp_rest) {
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/* copy character byte-stream to SCLP buffer */
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memcpy(buf, &cons->iov[cons->iov_sclp], cons->iov_sclp_rest);
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*size = cons->iov_sclp_rest + 1;
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cons->iov_sclp = 0;
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cons->iov_bs = 0;
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cons->iov_data_len = 0;
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cons->iov_sclp_rest = 0;
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event->event_pending = false;
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/* data provided and no more data pending */
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} else {
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/* if provided buffer is too small, just copy part */
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memcpy(buf, &cons->iov[cons->iov_sclp], avail);
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*size = avail + 1;
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cons->iov_sclp_rest -= avail;
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cons->iov_sclp += avail;
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/* more data pending */
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}
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}
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static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
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int *slen)
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{
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int avail;
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size_t src_len;
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uint8_t *to;
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ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
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if (!event->event_pending) {
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/* no data pending */
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return 0;
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}
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to = (uint8_t *)&acd->data;
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avail = *slen - sizeof(ASCIIConsoleData);
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get_console_data(event, to, &src_len, avail);
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acd->ebh.length = cpu_to_be16(sizeof(ASCIIConsoleData) + src_len);
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acd->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
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acd->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
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*slen = avail - src_len;
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return 1;
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}
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/* triggered by SCLP's write_event_data
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* - write console data to character layer
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* returns < 0 if an error occurred
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*/
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static ssize_t write_console_data(SCLPEvent *event, const uint8_t *buf,
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size_t len)
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{
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SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
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if (!scon->chr) {
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/* If there's no backend, we can just say we consumed all data. */
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return len;
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}
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return qemu_chr_fe_write_all(scon->chr, buf, len);
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}
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static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr)
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{
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int rc;
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int length;
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ssize_t written;
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ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
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length = be16_to_cpu(evt_buf_hdr->length) - sizeof(EventBufferHeader);
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written = write_console_data(event, (uint8_t *)acd->data, length);
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rc = SCLP_RC_NORMAL_COMPLETION;
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/* set event buffer accepted flag */
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evt_buf_hdr->flags |= SCLP_EVENT_BUFFER_ACCEPTED;
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/* written will be zero if a pty is not connected - don't treat as error */
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if (written < 0) {
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/* event buffer not accepted due to error in character layer */
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evt_buf_hdr->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
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rc = SCLP_RC_CONTAINED_EQUIPMENT_CHECK;
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}
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return rc;
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}
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static void trigger_ascii_console_data(void *opaque, int n, int level)
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{
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sclp_service_interrupt(0);
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}
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static const VMStateDescription vmstate_sclpconsole = {
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.name = "sclpconsole",
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.version_id = 0,
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.minimum_version_id = 0,
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.minimum_version_id_old = 0,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(event.event_pending, SCLPConsole),
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VMSTATE_UINT8_ARRAY(iov, SCLPConsole, SIZE_BUFFER_VT220),
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VMSTATE_UINT32(iov_sclp, SCLPConsole),
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VMSTATE_UINT32(iov_bs, SCLPConsole),
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VMSTATE_UINT32(iov_data_len, SCLPConsole),
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VMSTATE_UINT32(iov_sclp_rest, SCLPConsole),
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VMSTATE_END_OF_LIST()
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}
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};
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/* qemu object creation and initialization functions */
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/* tell character layer our call-back functions */
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static int console_init(SCLPEvent *event)
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{
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static bool console_available;
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SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
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if (console_available) {
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error_report("Multiple VT220 operator consoles are not supported");
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return -1;
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}
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console_available = true;
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if (scon->chr) {
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qemu_chr_add_handlers(scon->chr, chr_can_read,
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chr_read, NULL, scon);
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}
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scon->irq_read_vt220 = *qemu_allocate_irqs(trigger_ascii_console_data,
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NULL, 1);
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return 0;
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}
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static void console_reset(DeviceState *dev)
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{
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SCLPEvent *event = SCLP_EVENT(dev);
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SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
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event->event_pending = false;
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scon->iov_sclp = 0;
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scon->iov_bs = 0;
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scon->iov_data_len = 0;
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scon->iov_sclp_rest = 0;
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}
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static int console_exit(SCLPEvent *event)
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{
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return 0;
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}
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static Property console_properties[] = {
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DEFINE_PROP_CHR("chardev", SCLPConsole, chr),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void console_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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SCLPEventClass *ec = SCLP_EVENT_CLASS(klass);
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dc->props = console_properties;
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dc->reset = console_reset;
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dc->vmsd = &vmstate_sclpconsole;
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ec->init = console_init;
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ec->exit = console_exit;
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ec->get_send_mask = send_mask;
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ec->get_receive_mask = receive_mask;
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ec->can_handle_event = can_handle_event;
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ec->read_event_data = read_event_data;
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ec->write_event_data = write_event_data;
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}
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static const TypeInfo sclp_console_info = {
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.name = "sclpconsole",
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.parent = TYPE_SCLP_EVENT,
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.instance_size = sizeof(SCLPConsole),
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.class_init = console_class_init,
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.class_size = sizeof(SCLPEventClass),
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};
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static void register_types(void)
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{
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type_register_static(&sclp_console_info);
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}
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type_init(register_types)
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