306 lines
8.3 KiB
C
306 lines
8.3 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2005
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* Author(s): Anthony Liguori <aliguori@us.ibm.com>
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*
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* Copyright (C) Red Hat 2007
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*
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* Xen Console
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/select.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <termios.h>
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#include <stdarg.h>
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#include <sys/mman.h>
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#include "hw/hw.h"
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#include "sysemu/char.h"
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#include "hw/xen/xen_backend.h"
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#include <xen/io/console.h>
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struct buffer {
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uint8_t *data;
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size_t consumed;
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size_t size;
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size_t capacity;
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size_t max_capacity;
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};
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struct XenConsole {
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struct XenDevice xendev; /* must be first */
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struct buffer buffer;
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char console[XEN_BUFSIZE];
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int ring_ref;
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void *sring;
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CharDriverState *chr;
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int backlog;
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};
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static void buffer_append(struct XenConsole *con)
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{
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struct buffer *buffer = &con->buffer;
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XENCONS_RING_IDX cons, prod, size;
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struct xencons_interface *intf = con->sring;
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cons = intf->out_cons;
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prod = intf->out_prod;
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xen_mb();
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size = prod - cons;
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if ((size == 0) || (size > sizeof(intf->out)))
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return;
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if ((buffer->capacity - buffer->size) < size) {
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buffer->capacity += (size + 1024);
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buffer->data = g_realloc(buffer->data, buffer->capacity);
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}
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while (cons != prod)
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buffer->data[buffer->size++] = intf->out[
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MASK_XENCONS_IDX(cons++, intf->out)];
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xen_mb();
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intf->out_cons = cons;
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xen_be_send_notify(&con->xendev);
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if (buffer->max_capacity &&
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buffer->size > buffer->max_capacity) {
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/* Discard the middle of the data. */
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size_t over = buffer->size - buffer->max_capacity;
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uint8_t *maxpos = buffer->data + buffer->max_capacity;
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memmove(maxpos - over, maxpos, over);
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buffer->data = g_realloc(buffer->data, buffer->max_capacity);
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buffer->size = buffer->capacity = buffer->max_capacity;
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if (buffer->consumed > buffer->max_capacity - over)
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buffer->consumed = buffer->max_capacity - over;
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}
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}
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static void buffer_advance(struct buffer *buffer, size_t len)
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{
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buffer->consumed += len;
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if (buffer->consumed == buffer->size) {
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buffer->consumed = 0;
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buffer->size = 0;
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}
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}
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static int ring_free_bytes(struct XenConsole *con)
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{
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struct xencons_interface *intf = con->sring;
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XENCONS_RING_IDX cons, prod, space;
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cons = intf->in_cons;
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prod = intf->in_prod;
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xen_mb();
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space = prod - cons;
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if (space > sizeof(intf->in))
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return 0; /* ring is screwed: ignore it */
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return (sizeof(intf->in) - space);
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}
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static int xencons_can_receive(void *opaque)
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{
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struct XenConsole *con = opaque;
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return ring_free_bytes(con);
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}
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static void xencons_receive(void *opaque, const uint8_t *buf, int len)
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{
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struct XenConsole *con = opaque;
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struct xencons_interface *intf = con->sring;
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XENCONS_RING_IDX prod;
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int i, max;
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max = ring_free_bytes(con);
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/* The can_receive() func limits this, but check again anyway */
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if (max < len)
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len = max;
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prod = intf->in_prod;
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for (i = 0; i < len; i++) {
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intf->in[MASK_XENCONS_IDX(prod++, intf->in)] =
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buf[i];
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}
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xen_wmb();
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intf->in_prod = prod;
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xen_be_send_notify(&con->xendev);
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}
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static void xencons_send(struct XenConsole *con)
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{
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ssize_t len, size;
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size = con->buffer.size - con->buffer.consumed;
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if (con->chr)
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len = qemu_chr_fe_write(con->chr, con->buffer.data + con->buffer.consumed,
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size);
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else
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len = size;
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if (len < 1) {
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if (!con->backlog) {
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con->backlog = 1;
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xen_be_printf(&con->xendev, 1, "backlog piling up, nobody listening?\n");
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}
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} else {
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buffer_advance(&con->buffer, len);
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if (con->backlog && len == size) {
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con->backlog = 0;
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xen_be_printf(&con->xendev, 1, "backlog is gone\n");
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}
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}
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}
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/* -------------------------------------------------------------------- */
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static int con_init(struct XenDevice *xendev)
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{
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struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
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char *type, *dom, label[32];
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int ret = 0;
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const char *output;
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/* setup */
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dom = xs_get_domain_path(xenstore, con->xendev.dom);
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if (!xendev->dev) {
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snprintf(con->console, sizeof(con->console), "%s/console", dom);
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} else {
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snprintf(con->console, sizeof(con->console), "%s/device/console/%d", dom, xendev->dev);
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}
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free(dom);
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type = xenstore_read_str(con->console, "type");
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if (!type || strcmp(type, "ioemu") != 0) {
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xen_be_printf(xendev, 1, "not for me (type=%s)\n", type);
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ret = -1;
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goto out;
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}
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output = xenstore_read_str(con->console, "output");
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/* no Xen override, use qemu output device */
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if (output == NULL) {
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con->chr = serial_hds[con->xendev.dev];
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} else {
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snprintf(label, sizeof(label), "xencons%d", con->xendev.dev);
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con->chr = qemu_chr_new(label, output, NULL);
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}
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xenstore_store_pv_console_info(con->xendev.dev, con->chr);
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out:
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g_free(type);
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return ret;
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}
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static int con_initialise(struct XenDevice *xendev)
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{
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struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
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int limit;
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if (xenstore_read_int(con->console, "ring-ref", &con->ring_ref) == -1)
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return -1;
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if (xenstore_read_int(con->console, "port", &con->xendev.remote_port) == -1)
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return -1;
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if (xenstore_read_int(con->console, "limit", &limit) == 0)
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con->buffer.max_capacity = limit;
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if (!xendev->dev) {
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con->sring = xc_map_foreign_range(xen_xc, con->xendev.dom,
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XC_PAGE_SIZE,
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PROT_READ|PROT_WRITE,
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con->ring_ref);
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} else {
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con->sring = xc_gnttab_map_grant_ref(xendev->gnttabdev, con->xendev.dom,
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con->ring_ref,
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PROT_READ|PROT_WRITE);
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}
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if (!con->sring)
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return -1;
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xen_be_bind_evtchn(&con->xendev);
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if (con->chr) {
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if (qemu_chr_fe_claim(con->chr) == 0) {
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qemu_chr_add_handlers(con->chr, xencons_can_receive,
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xencons_receive, NULL, con);
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} else {
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xen_be_printf(xendev, 0,
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"xen_console_init error chardev %s already used\n",
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con->chr->label);
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con->chr = NULL;
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}
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}
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xen_be_printf(xendev, 1, "ring mfn %d, remote port %d, local port %d, limit %zd\n",
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con->ring_ref,
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con->xendev.remote_port,
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con->xendev.local_port,
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con->buffer.max_capacity);
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return 0;
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}
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static void con_disconnect(struct XenDevice *xendev)
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{
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struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
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if (!xendev->dev) {
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return;
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}
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if (con->chr) {
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qemu_chr_add_handlers(con->chr, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(con->chr);
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}
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xen_be_unbind_evtchn(&con->xendev);
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if (con->sring) {
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if (!xendev->gnttabdev) {
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munmap(con->sring, XC_PAGE_SIZE);
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} else {
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xc_gnttab_munmap(xendev->gnttabdev, con->sring, 1);
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}
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con->sring = NULL;
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}
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}
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static void con_event(struct XenDevice *xendev)
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{
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struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
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buffer_append(con);
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if (con->buffer.size - con->buffer.consumed)
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xencons_send(con);
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}
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/* -------------------------------------------------------------------- */
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struct XenDevOps xen_console_ops = {
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.size = sizeof(struct XenConsole),
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.flags = DEVOPS_FLAG_IGNORE_STATE|DEVOPS_FLAG_NEED_GNTDEV,
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.init = con_init,
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.initialise = con_initialise,
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.event = con_event,
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.disconnect = con_disconnect,
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};
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