759 lines
20 KiB
C
759 lines
20 KiB
C
/*
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* xen backend driver infrastructure
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* (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
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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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/*
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* TODO: add some xenbus / xenstore concepts overview here.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/signal.h>
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#include <xs.h>
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#include <xenctrl.h>
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#include <xen/grant_table.h>
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#include "hw.h"
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#include "qemu-char.h"
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#include "qemu-log.h"
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#include "xen_backend.h"
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/* ------------------------------------------------------------- */
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/* public */
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XenXC xen_xc = XC_HANDLER_INITIAL_VALUE;
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XenGnttab xen_xcg = XC_HANDLER_INITIAL_VALUE;
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struct xs_handle *xenstore = NULL;
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const char *xen_protocol;
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/* private */
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static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = QTAILQ_HEAD_INITIALIZER(xendevs);
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static int debug = 0;
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/* ------------------------------------------------------------- */
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int xenstore_write_str(const char *base, const char *node, const char *val)
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{
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char abspath[XEN_BUFSIZE];
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snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
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if (!xs_write(xenstore, 0, abspath, val, strlen(val))) {
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return -1;
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}
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return 0;
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}
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char *xenstore_read_str(const char *base, const char *node)
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{
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char abspath[XEN_BUFSIZE];
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unsigned int len;
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char *str, *ret = NULL;
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snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
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str = xs_read(xenstore, 0, abspath, &len);
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if (str != NULL) {
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/* move to qemu-allocated memory to make sure
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* callers can savely qemu_free() stuff. */
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ret = qemu_strdup(str);
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free(str);
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}
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return ret;
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}
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int xenstore_write_int(const char *base, const char *node, int ival)
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{
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char val[32];
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snprintf(val, sizeof(val), "%d", ival);
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return xenstore_write_str(base, node, val);
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}
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int xenstore_read_int(const char *base, const char *node, int *ival)
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{
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char *val;
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int rc = -1;
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val = xenstore_read_str(base, node);
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if (val && 1 == sscanf(val, "%d", ival)) {
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rc = 0;
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}
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qemu_free(val);
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return rc;
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}
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int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val)
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{
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return xenstore_write_str(xendev->be, node, val);
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}
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int xenstore_write_be_int(struct XenDevice *xendev, const char *node, int ival)
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{
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return xenstore_write_int(xendev->be, node, ival);
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}
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char *xenstore_read_be_str(struct XenDevice *xendev, const char *node)
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{
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return xenstore_read_str(xendev->be, node);
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}
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int xenstore_read_be_int(struct XenDevice *xendev, const char *node, int *ival)
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{
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return xenstore_read_int(xendev->be, node, ival);
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}
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char *xenstore_read_fe_str(struct XenDevice *xendev, const char *node)
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{
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return xenstore_read_str(xendev->fe, node);
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}
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int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival)
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{
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return xenstore_read_int(xendev->fe, node, ival);
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}
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/* ------------------------------------------------------------- */
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const char *xenbus_strstate(enum xenbus_state state)
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{
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static const char *const name[] = {
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[ XenbusStateUnknown ] = "Unknown",
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[ XenbusStateInitialising ] = "Initialising",
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[ XenbusStateInitWait ] = "InitWait",
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[ XenbusStateInitialised ] = "Initialised",
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[ XenbusStateConnected ] = "Connected",
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[ XenbusStateClosing ] = "Closing",
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[ XenbusStateClosed ] = "Closed",
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};
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return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID";
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}
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int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state)
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{
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int rc;
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rc = xenstore_write_be_int(xendev, "state", state);
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if (rc < 0) {
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return rc;
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}
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xen_be_printf(xendev, 1, "backend state: %s -> %s\n",
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xenbus_strstate(xendev->be_state), xenbus_strstate(state));
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xendev->be_state = state;
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return 0;
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}
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/* ------------------------------------------------------------- */
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struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev)
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{
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struct XenDevice *xendev;
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QTAILQ_FOREACH(xendev, &xendevs, next) {
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if (xendev->dom != dom) {
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continue;
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}
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if (xendev->dev != dev) {
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continue;
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}
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if (strcmp(xendev->type, type) != 0) {
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continue;
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}
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return xendev;
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}
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return NULL;
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}
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/*
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* get xen backend device, allocate a new one if it doesn't exist.
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*/
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static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
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struct XenDevOps *ops)
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{
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struct XenDevice *xendev;
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char *dom0;
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xendev = xen_be_find_xendev(type, dom, dev);
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if (xendev) {
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return xendev;
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}
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/* init new xendev */
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xendev = qemu_mallocz(ops->size);
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xendev->type = type;
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xendev->dom = dom;
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xendev->dev = dev;
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xendev->ops = ops;
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dom0 = xs_get_domain_path(xenstore, 0);
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snprintf(xendev->be, sizeof(xendev->be), "%s/backend/%s/%d/%d",
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dom0, xendev->type, xendev->dom, xendev->dev);
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snprintf(xendev->name, sizeof(xendev->name), "%s-%d",
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xendev->type, xendev->dev);
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free(dom0);
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xendev->debug = debug;
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xendev->local_port = -1;
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xendev->evtchndev = xen_xc_evtchn_open(NULL, 0);
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if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) {
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xen_be_printf(NULL, 0, "can't open evtchn device\n");
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qemu_free(xendev);
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return NULL;
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}
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fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC);
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if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
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xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0);
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if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) {
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xen_be_printf(NULL, 0, "can't open gnttab device\n");
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xc_evtchn_close(xendev->evtchndev);
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qemu_free(xendev);
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return NULL;
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}
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} else {
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xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE;
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}
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QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
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if (xendev->ops->alloc) {
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xendev->ops->alloc(xendev);
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}
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return xendev;
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}
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/*
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* release xen backend device.
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*/
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static struct XenDevice *xen_be_del_xendev(int dom, int dev)
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{
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struct XenDevice *xendev, *xnext;
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/*
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* This is pretty much like QTAILQ_FOREACH(xendev, &xendevs, next) but
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* we save the next pointer in xnext because we might free xendev.
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*/
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xnext = xendevs.tqh_first;
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while (xnext) {
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xendev = xnext;
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xnext = xendev->next.tqe_next;
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if (xendev->dom != dom) {
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continue;
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}
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if (xendev->dev != dev && dev != -1) {
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continue;
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}
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if (xendev->ops->free) {
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xendev->ops->free(xendev);
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}
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if (xendev->fe) {
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char token[XEN_BUFSIZE];
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snprintf(token, sizeof(token), "fe:%p", xendev);
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xs_unwatch(xenstore, xendev->fe, token);
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qemu_free(xendev->fe);
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}
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if (xendev->evtchndev != XC_HANDLER_INITIAL_VALUE) {
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xc_evtchn_close(xendev->evtchndev);
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}
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if (xendev->gnttabdev != XC_HANDLER_INITIAL_VALUE) {
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xc_gnttab_close(xendev->gnttabdev);
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}
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QTAILQ_REMOVE(&xendevs, xendev, next);
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qemu_free(xendev);
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}
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return NULL;
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}
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/*
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* Sync internal data structures on xenstore updates.
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* Node specifies the changed field. node = NULL means
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* update all fields (used for initialization).
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*/
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static void xen_be_backend_changed(struct XenDevice *xendev, const char *node)
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{
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if (node == NULL || strcmp(node, "online") == 0) {
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if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) {
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xendev->online = 0;
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}
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}
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if (node) {
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xen_be_printf(xendev, 2, "backend update: %s\n", node);
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if (xendev->ops->backend_changed) {
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xendev->ops->backend_changed(xendev, node);
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}
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}
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}
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static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node)
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{
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int fe_state;
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if (node == NULL || strcmp(node, "state") == 0) {
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if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) {
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fe_state = XenbusStateUnknown;
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}
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if (xendev->fe_state != fe_state) {
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xen_be_printf(xendev, 1, "frontend state: %s -> %s\n",
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xenbus_strstate(xendev->fe_state),
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xenbus_strstate(fe_state));
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}
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xendev->fe_state = fe_state;
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}
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if (node == NULL || strcmp(node, "protocol") == 0) {
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qemu_free(xendev->protocol);
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xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
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if (xendev->protocol) {
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xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol);
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}
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}
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if (node) {
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xen_be_printf(xendev, 2, "frontend update: %s\n", node);
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if (xendev->ops->frontend_changed) {
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xendev->ops->frontend_changed(xendev, node);
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}
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}
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}
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/* ------------------------------------------------------------- */
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/* Check for possible state transitions and perform them. */
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/*
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* Initial xendev setup. Read frontend path, register watch for it.
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* Should succeed once xend finished setting up the backend device.
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*
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* Also sets initial state (-> Initializing) when done. Which
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* only affects the xendev->be_state variable as xenbus should
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* already be put into that state by xend.
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*/
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static int xen_be_try_setup(struct XenDevice *xendev)
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{
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char token[XEN_BUFSIZE];
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int be_state;
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if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
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xen_be_printf(xendev, 0, "reading backend state failed\n");
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return -1;
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}
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if (be_state != XenbusStateInitialising) {
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xen_be_printf(xendev, 0, "initial backend state is wrong (%s)\n",
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xenbus_strstate(be_state));
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return -1;
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}
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xendev->fe = xenstore_read_be_str(xendev, "frontend");
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if (xendev->fe == NULL) {
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xen_be_printf(xendev, 0, "reading frontend path failed\n");
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return -1;
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}
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/* setup frontend watch */
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snprintf(token, sizeof(token), "fe:%p", xendev);
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if (!xs_watch(xenstore, xendev->fe, token)) {
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xen_be_printf(xendev, 0, "watching frontend path (%s) failed\n",
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xendev->fe);
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return -1;
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}
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xen_be_set_state(xendev, XenbusStateInitialising);
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xen_be_backend_changed(xendev, NULL);
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xen_be_frontend_changed(xendev, NULL);
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return 0;
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}
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/*
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* Try initialize xendev. Prepare everything the backend can do
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* without synchronizing with the frontend. Fakes hotplug-status. No
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* hotplug involved here because this is about userspace drivers, thus
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* there are kernel backend devices which could invoke hotplug.
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*
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* Goes to InitWait on success.
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*/
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static int xen_be_try_init(struct XenDevice *xendev)
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{
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int rc = 0;
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if (!xendev->online) {
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xen_be_printf(xendev, 1, "not online\n");
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return -1;
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}
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if (xendev->ops->init) {
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rc = xendev->ops->init(xendev);
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}
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if (rc != 0) {
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xen_be_printf(xendev, 1, "init() failed\n");
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return rc;
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}
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xenstore_write_be_str(xendev, "hotplug-status", "connected");
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xen_be_set_state(xendev, XenbusStateInitWait);
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return 0;
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}
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/*
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* Try to connect xendev. Depends on the frontend being ready
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* for it (shared ring and evtchn info in xenstore, state being
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* Initialised or Connected).
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*
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* Goes to Connected on success.
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*/
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static int xen_be_try_connect(struct XenDevice *xendev)
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{
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int rc = 0;
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if (xendev->fe_state != XenbusStateInitialised &&
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xendev->fe_state != XenbusStateConnected) {
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if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
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xen_be_printf(xendev, 2, "frontend not ready, ignoring\n");
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} else {
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xen_be_printf(xendev, 2, "frontend not ready (yet)\n");
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return -1;
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}
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}
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if (xendev->ops->connect) {
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rc = xendev->ops->connect(xendev);
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}
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if (rc != 0) {
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xen_be_printf(xendev, 0, "connect() failed\n");
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return rc;
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}
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xen_be_set_state(xendev, XenbusStateConnected);
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return 0;
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}
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/*
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* Teardown connection.
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*
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* Goes to Closed when done.
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*/
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static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state)
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{
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if (xendev->be_state != XenbusStateClosing &&
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xendev->be_state != XenbusStateClosed &&
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xendev->ops->disconnect) {
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xendev->ops->disconnect(xendev);
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}
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if (xendev->be_state != state) {
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xen_be_set_state(xendev, state);
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}
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}
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/*
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* Try to reset xendev, for reconnection by another frontend instance.
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*/
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static int xen_be_try_reset(struct XenDevice *xendev)
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{
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if (xendev->fe_state != XenbusStateInitialising) {
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return -1;
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}
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xen_be_printf(xendev, 1, "device reset (for re-connect)\n");
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xen_be_set_state(xendev, XenbusStateInitialising);
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return 0;
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}
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/*
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* state change dispatcher function
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*/
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void xen_be_check_state(struct XenDevice *xendev)
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{
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int rc = 0;
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/* frontend may request shutdown from almost anywhere */
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if (xendev->fe_state == XenbusStateClosing ||
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xendev->fe_state == XenbusStateClosed) {
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xen_be_disconnect(xendev, xendev->fe_state);
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return;
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}
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/* check for possible backend state transitions */
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for (;;) {
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switch (xendev->be_state) {
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case XenbusStateUnknown:
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rc = xen_be_try_setup(xendev);
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break;
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case XenbusStateInitialising:
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rc = xen_be_try_init(xendev);
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break;
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case XenbusStateInitWait:
|
|
rc = xen_be_try_connect(xendev);
|
|
break;
|
|
case XenbusStateClosed:
|
|
rc = xen_be_try_reset(xendev);
|
|
break;
|
|
default:
|
|
rc = -1;
|
|
}
|
|
if (rc != 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------- */
|
|
|
|
static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
|
|
{
|
|
struct XenDevice *xendev;
|
|
char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
|
|
char **dev = NULL, *dom0;
|
|
unsigned int cdev, j;
|
|
|
|
/* setup watch */
|
|
dom0 = xs_get_domain_path(xenstore, 0);
|
|
snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
|
|
snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom);
|
|
free(dom0);
|
|
if (!xs_watch(xenstore, path, token)) {
|
|
xen_be_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", path);
|
|
return -1;
|
|
}
|
|
|
|
/* look for backends */
|
|
dev = xs_directory(xenstore, 0, path, &cdev);
|
|
if (!dev) {
|
|
return 0;
|
|
}
|
|
for (j = 0; j < cdev; j++) {
|
|
xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops);
|
|
if (xendev == NULL) {
|
|
continue;
|
|
}
|
|
xen_be_check_state(xendev);
|
|
}
|
|
free(dev);
|
|
return 0;
|
|
}
|
|
|
|
static void xenstore_update_be(char *watch, char *type, int dom,
|
|
struct XenDevOps *ops)
|
|
{
|
|
struct XenDevice *xendev;
|
|
char path[XEN_BUFSIZE], *dom0;
|
|
unsigned int len, dev;
|
|
|
|
dom0 = xs_get_domain_path(xenstore, 0);
|
|
len = snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom);
|
|
free(dom0);
|
|
if (strncmp(path, watch, len) != 0) {
|
|
return;
|
|
}
|
|
if (sscanf(watch+len, "/%u/%255s", &dev, path) != 2) {
|
|
strcpy(path, "");
|
|
if (sscanf(watch+len, "/%u", &dev) != 1) {
|
|
dev = -1;
|
|
}
|
|
}
|
|
if (dev == -1) {
|
|
return;
|
|
}
|
|
|
|
if (0) {
|
|
/* FIXME: detect devices being deleted from xenstore ... */
|
|
xen_be_del_xendev(dom, dev);
|
|
}
|
|
|
|
xendev = xen_be_get_xendev(type, dom, dev, ops);
|
|
if (xendev != NULL) {
|
|
xen_be_backend_changed(xendev, path);
|
|
xen_be_check_state(xendev);
|
|
}
|
|
}
|
|
|
|
static void xenstore_update_fe(char *watch, struct XenDevice *xendev)
|
|
{
|
|
char *node;
|
|
unsigned int len;
|
|
|
|
len = strlen(xendev->fe);
|
|
if (strncmp(xendev->fe, watch, len) != 0) {
|
|
return;
|
|
}
|
|
if (watch[len] != '/') {
|
|
return;
|
|
}
|
|
node = watch + len + 1;
|
|
|
|
xen_be_frontend_changed(xendev, node);
|
|
xen_be_check_state(xendev);
|
|
}
|
|
|
|
static void xenstore_update(void *unused)
|
|
{
|
|
char **vec = NULL;
|
|
intptr_t type, ops, ptr;
|
|
unsigned int dom, count;
|
|
|
|
vec = xs_read_watch(xenstore, &count);
|
|
if (vec == NULL) {
|
|
goto cleanup;
|
|
}
|
|
|
|
if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR,
|
|
&type, &dom, &ops) == 3) {
|
|
xenstore_update_be(vec[XS_WATCH_PATH], (void*)type, dom, (void*)ops);
|
|
}
|
|
if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) {
|
|
xenstore_update_fe(vec[XS_WATCH_PATH], (void*)ptr);
|
|
}
|
|
|
|
cleanup:
|
|
free(vec);
|
|
}
|
|
|
|
static void xen_be_evtchn_event(void *opaque)
|
|
{
|
|
struct XenDevice *xendev = opaque;
|
|
evtchn_port_t port;
|
|
|
|
port = xc_evtchn_pending(xendev->evtchndev);
|
|
if (port != xendev->local_port) {
|
|
xen_be_printf(xendev, 0, "xc_evtchn_pending returned %d (expected %d)\n",
|
|
port, xendev->local_port);
|
|
return;
|
|
}
|
|
xc_evtchn_unmask(xendev->evtchndev, port);
|
|
|
|
if (xendev->ops->event) {
|
|
xendev->ops->event(xendev);
|
|
}
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
|
|
int xen_be_init(void)
|
|
{
|
|
xenstore = xs_daemon_open();
|
|
if (!xenstore) {
|
|
xen_be_printf(NULL, 0, "can't connect to xenstored\n");
|
|
return -1;
|
|
}
|
|
|
|
if (qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL) < 0) {
|
|
goto err;
|
|
}
|
|
|
|
xen_xc = xen_xc_interface_open(0, 0, 0);
|
|
if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
|
|
xen_be_printf(NULL, 0, "can't open xen interface\n");
|
|
goto err;
|
|
}
|
|
return 0;
|
|
|
|
err:
|
|
qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL);
|
|
xs_daemon_close(xenstore);
|
|
xenstore = NULL;
|
|
|
|
return -1;
|
|
}
|
|
|
|
int xen_be_register(const char *type, struct XenDevOps *ops)
|
|
{
|
|
return xenstore_scan(type, xen_domid, ops);
|
|
}
|
|
|
|
int xen_be_bind_evtchn(struct XenDevice *xendev)
|
|
{
|
|
if (xendev->local_port != -1) {
|
|
return 0;
|
|
}
|
|
xendev->local_port = xc_evtchn_bind_interdomain
|
|
(xendev->evtchndev, xendev->dom, xendev->remote_port);
|
|
if (xendev->local_port == -1) {
|
|
xen_be_printf(xendev, 0, "xc_evtchn_bind_interdomain failed\n");
|
|
return -1;
|
|
}
|
|
xen_be_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
|
|
qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev),
|
|
xen_be_evtchn_event, NULL, xendev);
|
|
return 0;
|
|
}
|
|
|
|
void xen_be_unbind_evtchn(struct XenDevice *xendev)
|
|
{
|
|
if (xendev->local_port == -1) {
|
|
return;
|
|
}
|
|
qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), NULL, NULL, NULL);
|
|
xc_evtchn_unbind(xendev->evtchndev, xendev->local_port);
|
|
xen_be_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port);
|
|
xendev->local_port = -1;
|
|
}
|
|
|
|
int xen_be_send_notify(struct XenDevice *xendev)
|
|
{
|
|
return xc_evtchn_notify(xendev->evtchndev, xendev->local_port);
|
|
}
|
|
|
|
/*
|
|
* msg_level:
|
|
* 0 == errors (stderr + logfile).
|
|
* 1 == informative debug messages (logfile only).
|
|
* 2 == noisy debug messages (logfile only).
|
|
* 3 == will flood your log (logfile only).
|
|
*/
|
|
void xen_be_printf(struct XenDevice *xendev, int msg_level, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
if (xendev) {
|
|
if (msg_level > xendev->debug) {
|
|
return;
|
|
}
|
|
qemu_log("xen be: %s: ", xendev->name);
|
|
if (msg_level == 0) {
|
|
fprintf(stderr, "xen be: %s: ", xendev->name);
|
|
}
|
|
} else {
|
|
if (msg_level > debug) {
|
|
return;
|
|
}
|
|
qemu_log("xen be core: ");
|
|
if (msg_level == 0) {
|
|
fprintf(stderr, "xen be core: ");
|
|
}
|
|
}
|
|
va_start(args, fmt);
|
|
qemu_log_vprintf(fmt, args);
|
|
va_end(args);
|
|
if (msg_level == 0) {
|
|
va_start(args, fmt);
|
|
vfprintf(stderr, fmt, args);
|
|
va_end(args);
|
|
}
|
|
qemu_log_flush();
|
|
}
|