mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-08-04 00:03:54 -06:00
hw: move target-independent files to subdirectories
This patch tackles all files that are compiled once, moving them to subdirectories of hw/. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
parent
ce3b494cb5
commit
49ab747f66
227 changed files with 205 additions and 208 deletions
800
hw/xen/xen_backend.c
Normal file
800
hw/xen/xen_backend.c
Normal file
|
|
@ -0,0 +1,800 @@
|
|||
/*
|
||||
* xen backend driver infrastructure
|
||||
* (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; under version 2 of the License.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* Contributions after 2012-01-13 are licensed under the terms of the
|
||||
* GNU GPL, version 2 or (at your option) any later version.
|
||||
*/
|
||||
|
||||
/*
|
||||
* TODO: add some xenbus / xenstore concepts overview here.
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdarg.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <fcntl.h>
|
||||
#include <inttypes.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/mman.h>
|
||||
#include <sys/signal.h>
|
||||
|
||||
#include "hw/hw.h"
|
||||
#include "char/char.h"
|
||||
#include "qemu/log.h"
|
||||
#include "hw/xen/xen_backend.h"
|
||||
|
||||
#include <xen/grant_table.h>
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
|
||||
/* public */
|
||||
XenXC xen_xc = XC_HANDLER_INITIAL_VALUE;
|
||||
XenGnttab xen_xcg = XC_HANDLER_INITIAL_VALUE;
|
||||
struct xs_handle *xenstore = NULL;
|
||||
const char *xen_protocol;
|
||||
|
||||
/* private */
|
||||
static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = QTAILQ_HEAD_INITIALIZER(xendevs);
|
||||
static int debug = 0;
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
|
||||
int xenstore_write_str(const char *base, const char *node, const char *val)
|
||||
{
|
||||
char abspath[XEN_BUFSIZE];
|
||||
|
||||
snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
|
||||
if (!xs_write(xenstore, 0, abspath, val, strlen(val))) {
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
char *xenstore_read_str(const char *base, const char *node)
|
||||
{
|
||||
char abspath[XEN_BUFSIZE];
|
||||
unsigned int len;
|
||||
char *str, *ret = NULL;
|
||||
|
||||
snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
|
||||
str = xs_read(xenstore, 0, abspath, &len);
|
||||
if (str != NULL) {
|
||||
/* move to qemu-allocated memory to make sure
|
||||
* callers can savely g_free() stuff. */
|
||||
ret = g_strdup(str);
|
||||
free(str);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int xenstore_write_int(const char *base, const char *node, int ival)
|
||||
{
|
||||
char val[12];
|
||||
|
||||
snprintf(val, sizeof(val), "%d", ival);
|
||||
return xenstore_write_str(base, node, val);
|
||||
}
|
||||
|
||||
int xenstore_write_int64(const char *base, const char *node, int64_t ival)
|
||||
{
|
||||
char val[21];
|
||||
|
||||
snprintf(val, sizeof(val), "%"PRId64, ival);
|
||||
return xenstore_write_str(base, node, val);
|
||||
}
|
||||
|
||||
int xenstore_read_int(const char *base, const char *node, int *ival)
|
||||
{
|
||||
char *val;
|
||||
int rc = -1;
|
||||
|
||||
val = xenstore_read_str(base, node);
|
||||
if (val && 1 == sscanf(val, "%d", ival)) {
|
||||
rc = 0;
|
||||
}
|
||||
g_free(val);
|
||||
return rc;
|
||||
}
|
||||
|
||||
int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val)
|
||||
{
|
||||
return xenstore_write_str(xendev->be, node, val);
|
||||
}
|
||||
|
||||
int xenstore_write_be_int(struct XenDevice *xendev, const char *node, int ival)
|
||||
{
|
||||
return xenstore_write_int(xendev->be, node, ival);
|
||||
}
|
||||
|
||||
int xenstore_write_be_int64(struct XenDevice *xendev, const char *node, int64_t ival)
|
||||
{
|
||||
return xenstore_write_int64(xendev->be, node, ival);
|
||||
}
|
||||
|
||||
char *xenstore_read_be_str(struct XenDevice *xendev, const char *node)
|
||||
{
|
||||
return xenstore_read_str(xendev->be, node);
|
||||
}
|
||||
|
||||
int xenstore_read_be_int(struct XenDevice *xendev, const char *node, int *ival)
|
||||
{
|
||||
return xenstore_read_int(xendev->be, node, ival);
|
||||
}
|
||||
|
||||
char *xenstore_read_fe_str(struct XenDevice *xendev, const char *node)
|
||||
{
|
||||
return xenstore_read_str(xendev->fe, node);
|
||||
}
|
||||
|
||||
int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival)
|
||||
{
|
||||
return xenstore_read_int(xendev->fe, node, ival);
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
|
||||
const char *xenbus_strstate(enum xenbus_state state)
|
||||
{
|
||||
static const char *const name[] = {
|
||||
[ XenbusStateUnknown ] = "Unknown",
|
||||
[ XenbusStateInitialising ] = "Initialising",
|
||||
[ XenbusStateInitWait ] = "InitWait",
|
||||
[ XenbusStateInitialised ] = "Initialised",
|
||||
[ XenbusStateConnected ] = "Connected",
|
||||
[ XenbusStateClosing ] = "Closing",
|
||||
[ XenbusStateClosed ] = "Closed",
|
||||
};
|
||||
return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID";
|
||||
}
|
||||
|
||||
int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = xenstore_write_be_int(xendev, "state", state);
|
||||
if (rc < 0) {
|
||||
return rc;
|
||||
}
|
||||
xen_be_printf(xendev, 1, "backend state: %s -> %s\n",
|
||||
xenbus_strstate(xendev->be_state), xenbus_strstate(state));
|
||||
xendev->be_state = state;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
|
||||
struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev)
|
||||
{
|
||||
struct XenDevice *xendev;
|
||||
|
||||
QTAILQ_FOREACH(xendev, &xendevs, next) {
|
||||
if (xendev->dom != dom) {
|
||||
continue;
|
||||
}
|
||||
if (xendev->dev != dev) {
|
||||
continue;
|
||||
}
|
||||
if (strcmp(xendev->type, type) != 0) {
|
||||
continue;
|
||||
}
|
||||
return xendev;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* get xen backend device, allocate a new one if it doesn't exist.
|
||||
*/
|
||||
static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
|
||||
struct XenDevOps *ops)
|
||||
{
|
||||
struct XenDevice *xendev;
|
||||
char *dom0;
|
||||
|
||||
xendev = xen_be_find_xendev(type, dom, dev);
|
||||
if (xendev) {
|
||||
return xendev;
|
||||
}
|
||||
|
||||
/* init new xendev */
|
||||
xendev = g_malloc0(ops->size);
|
||||
xendev->type = type;
|
||||
xendev->dom = dom;
|
||||
xendev->dev = dev;
|
||||
xendev->ops = ops;
|
||||
|
||||
dom0 = xs_get_domain_path(xenstore, 0);
|
||||
snprintf(xendev->be, sizeof(xendev->be), "%s/backend/%s/%d/%d",
|
||||
dom0, xendev->type, xendev->dom, xendev->dev);
|
||||
snprintf(xendev->name, sizeof(xendev->name), "%s-%d",
|
||||
xendev->type, xendev->dev);
|
||||
free(dom0);
|
||||
|
||||
xendev->debug = debug;
|
||||
xendev->local_port = -1;
|
||||
|
||||
xendev->evtchndev = xen_xc_evtchn_open(NULL, 0);
|
||||
if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) {
|
||||
xen_be_printf(NULL, 0, "can't open evtchn device\n");
|
||||
g_free(xendev);
|
||||
return NULL;
|
||||
}
|
||||
fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC);
|
||||
|
||||
if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
|
||||
xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0);
|
||||
if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) {
|
||||
xen_be_printf(NULL, 0, "can't open gnttab device\n");
|
||||
xc_evtchn_close(xendev->evtchndev);
|
||||
g_free(xendev);
|
||||
return NULL;
|
||||
}
|
||||
} else {
|
||||
xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE;
|
||||
}
|
||||
|
||||
QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
|
||||
|
||||
if (xendev->ops->alloc) {
|
||||
xendev->ops->alloc(xendev);
|
||||
}
|
||||
|
||||
return xendev;
|
||||
}
|
||||
|
||||
/*
|
||||
* release xen backend device.
|
||||
*/
|
||||
static struct XenDevice *xen_be_del_xendev(int dom, int dev)
|
||||
{
|
||||
struct XenDevice *xendev, *xnext;
|
||||
|
||||
/*
|
||||
* This is pretty much like QTAILQ_FOREACH(xendev, &xendevs, next) but
|
||||
* we save the next pointer in xnext because we might free xendev.
|
||||
*/
|
||||
xnext = xendevs.tqh_first;
|
||||
while (xnext) {
|
||||
xendev = xnext;
|
||||
xnext = xendev->next.tqe_next;
|
||||
|
||||
if (xendev->dom != dom) {
|
||||
continue;
|
||||
}
|
||||
if (xendev->dev != dev && dev != -1) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (xendev->ops->free) {
|
||||
xendev->ops->free(xendev);
|
||||
}
|
||||
|
||||
if (xendev->fe) {
|
||||
char token[XEN_BUFSIZE];
|
||||
snprintf(token, sizeof(token), "fe:%p", xendev);
|
||||
xs_unwatch(xenstore, xendev->fe, token);
|
||||
g_free(xendev->fe);
|
||||
}
|
||||
|
||||
if (xendev->evtchndev != XC_HANDLER_INITIAL_VALUE) {
|
||||
xc_evtchn_close(xendev->evtchndev);
|
||||
}
|
||||
if (xendev->gnttabdev != XC_HANDLER_INITIAL_VALUE) {
|
||||
xc_gnttab_close(xendev->gnttabdev);
|
||||
}
|
||||
|
||||
QTAILQ_REMOVE(&xendevs, xendev, next);
|
||||
g_free(xendev);
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Sync internal data structures on xenstore updates.
|
||||
* Node specifies the changed field. node = NULL means
|
||||
* update all fields (used for initialization).
|
||||
*/
|
||||
static void xen_be_backend_changed(struct XenDevice *xendev, const char *node)
|
||||
{
|
||||
if (node == NULL || strcmp(node, "online") == 0) {
|
||||
if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) {
|
||||
xendev->online = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (node) {
|
||||
xen_be_printf(xendev, 2, "backend update: %s\n", node);
|
||||
if (xendev->ops->backend_changed) {
|
||||
xendev->ops->backend_changed(xendev, node);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node)
|
||||
{
|
||||
int fe_state;
|
||||
|
||||
if (node == NULL || strcmp(node, "state") == 0) {
|
||||
if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) {
|
||||
fe_state = XenbusStateUnknown;
|
||||
}
|
||||
if (xendev->fe_state != fe_state) {
|
||||
xen_be_printf(xendev, 1, "frontend state: %s -> %s\n",
|
||||
xenbus_strstate(xendev->fe_state),
|
||||
xenbus_strstate(fe_state));
|
||||
}
|
||||
xendev->fe_state = fe_state;
|
||||
}
|
||||
if (node == NULL || strcmp(node, "protocol") == 0) {
|
||||
g_free(xendev->protocol);
|
||||
xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
|
||||
if (xendev->protocol) {
|
||||
xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol);
|
||||
}
|
||||
}
|
||||
|
||||
if (node) {
|
||||
xen_be_printf(xendev, 2, "frontend update: %s\n", node);
|
||||
if (xendev->ops->frontend_changed) {
|
||||
xendev->ops->frontend_changed(xendev, node);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
/* Check for possible state transitions and perform them. */
|
||||
|
||||
/*
|
||||
* Initial xendev setup. Read frontend path, register watch for it.
|
||||
* Should succeed once xend finished setting up the backend device.
|
||||
*
|
||||
* Also sets initial state (-> Initializing) when done. Which
|
||||
* only affects the xendev->be_state variable as xenbus should
|
||||
* already be put into that state by xend.
|
||||
*/
|
||||
static int xen_be_try_setup(struct XenDevice *xendev)
|
||||
{
|
||||
char token[XEN_BUFSIZE];
|
||||
int be_state;
|
||||
|
||||
if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
|
||||
xen_be_printf(xendev, 0, "reading backend state failed\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (be_state != XenbusStateInitialising) {
|
||||
xen_be_printf(xendev, 0, "initial backend state is wrong (%s)\n",
|
||||
xenbus_strstate(be_state));
|
||||
return -1;
|
||||
}
|
||||
|
||||
xendev->fe = xenstore_read_be_str(xendev, "frontend");
|
||||
if (xendev->fe == NULL) {
|
||||
xen_be_printf(xendev, 0, "reading frontend path failed\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* setup frontend watch */
|
||||
snprintf(token, sizeof(token), "fe:%p", xendev);
|
||||
if (!xs_watch(xenstore, xendev->fe, token)) {
|
||||
xen_be_printf(xendev, 0, "watching frontend path (%s) failed\n",
|
||||
xendev->fe);
|
||||
return -1;
|
||||
}
|
||||
xen_be_set_state(xendev, XenbusStateInitialising);
|
||||
|
||||
xen_be_backend_changed(xendev, NULL);
|
||||
xen_be_frontend_changed(xendev, NULL);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try initialize xendev. Prepare everything the backend can do
|
||||
* without synchronizing with the frontend. Fakes hotplug-status. No
|
||||
* hotplug involved here because this is about userspace drivers, thus
|
||||
* there are kernel backend devices which could invoke hotplug.
|
||||
*
|
||||
* Goes to InitWait on success.
|
||||
*/
|
||||
static int xen_be_try_init(struct XenDevice *xendev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
if (!xendev->online) {
|
||||
xen_be_printf(xendev, 1, "not online\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (xendev->ops->init) {
|
||||
rc = xendev->ops->init(xendev);
|
||||
}
|
||||
if (rc != 0) {
|
||||
xen_be_printf(xendev, 1, "init() failed\n");
|
||||
return rc;
|
||||
}
|
||||
|
||||
xenstore_write_be_str(xendev, "hotplug-status", "connected");
|
||||
xen_be_set_state(xendev, XenbusStateInitWait);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to initialise xendev. Depends on the frontend being ready
|
||||
* for it (shared ring and evtchn info in xenstore, state being
|
||||
* Initialised or Connected).
|
||||
*
|
||||
* Goes to Connected on success.
|
||||
*/
|
||||
static int xen_be_try_initialise(struct XenDevice *xendev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
if (xendev->fe_state != XenbusStateInitialised &&
|
||||
xendev->fe_state != XenbusStateConnected) {
|
||||
if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
|
||||
xen_be_printf(xendev, 2, "frontend not ready, ignoring\n");
|
||||
} else {
|
||||
xen_be_printf(xendev, 2, "frontend not ready (yet)\n");
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
if (xendev->ops->initialise) {
|
||||
rc = xendev->ops->initialise(xendev);
|
||||
}
|
||||
if (rc != 0) {
|
||||
xen_be_printf(xendev, 0, "initialise() failed\n");
|
||||
return rc;
|
||||
}
|
||||
|
||||
xen_be_set_state(xendev, XenbusStateConnected);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to let xendev know that it is connected. Depends on the
|
||||
* frontend being Connected. Note that this may be called more
|
||||
* than once since the backend state is not modified.
|
||||
*/
|
||||
static void xen_be_try_connected(struct XenDevice *xendev)
|
||||
{
|
||||
if (!xendev->ops->connected) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (xendev->fe_state != XenbusStateConnected) {
|
||||
if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
|
||||
xen_be_printf(xendev, 2, "frontend not ready, ignoring\n");
|
||||
} else {
|
||||
xen_be_printf(xendev, 2, "frontend not ready (yet)\n");
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
xendev->ops->connected(xendev);
|
||||
}
|
||||
|
||||
/*
|
||||
* Teardown connection.
|
||||
*
|
||||
* Goes to Closed when done.
|
||||
*/
|
||||
static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state)
|
||||
{
|
||||
if (xendev->be_state != XenbusStateClosing &&
|
||||
xendev->be_state != XenbusStateClosed &&
|
||||
xendev->ops->disconnect) {
|
||||
xendev->ops->disconnect(xendev);
|
||||
}
|
||||
if (xendev->be_state != state) {
|
||||
xen_be_set_state(xendev, state);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to reset xendev, for reconnection by another frontend instance.
|
||||
*/
|
||||
static int xen_be_try_reset(struct XenDevice *xendev)
|
||||
{
|
||||
if (xendev->fe_state != XenbusStateInitialising) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
xen_be_printf(xendev, 1, "device reset (for re-connect)\n");
|
||||
xen_be_set_state(xendev, XenbusStateInitialising);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* state change dispatcher function
|
||||
*/
|
||||
void xen_be_check_state(struct XenDevice *xendev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
/* frontend may request shutdown from almost anywhere */
|
||||
if (xendev->fe_state == XenbusStateClosing ||
|
||||
xendev->fe_state == XenbusStateClosed) {
|
||||
xen_be_disconnect(xendev, xendev->fe_state);
|
||||
return;
|
||||
}
|
||||
|
||||
/* check for possible backend state transitions */
|
||||
for (;;) {
|
||||
switch (xendev->be_state) {
|
||||
case XenbusStateUnknown:
|
||||
rc = xen_be_try_setup(xendev);
|
||||
break;
|
||||
case XenbusStateInitialising:
|
||||
rc = xen_be_try_init(xendev);
|
||||
break;
|
||||
case XenbusStateInitWait:
|
||||
rc = xen_be_try_initialise(xendev);
|
||||
break;
|
||||
case XenbusStateConnected:
|
||||
/* xendev->be_state doesn't change */
|
||||
xen_be_try_connected(xendev);
|
||||
rc = -1;
|
||||
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, *bepath;
|
||||
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;
|
||||
}
|
||||
|
||||
xendev = xen_be_get_xendev(type, dom, dev, ops);
|
||||
if (xendev != NULL) {
|
||||
bepath = xs_read(xenstore, 0, xendev->be, &len);
|
||||
if (bepath == NULL) {
|
||||
xen_be_del_xendev(dom, dev);
|
||||
} else {
|
||||
free(bepath);
|
||||
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;
|
||||
}
|
||||
|
||||
if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
|
||||
/* Check if xen_init() have been called */
|
||||
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();
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue