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/*
* Copyright (C) 2014 FUJITSU LIMITED
* Author: Yang Hongyang <yanghy@cn.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 only. with the special
* exception on linking described in file 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 Lesser General Public License for more details.
*/
#include "libxl_osdeps.h" /* must come before any other headers */
#include "libxl_internal.h"
/*----- setup() and teardown() -----*/
/* callbacks */
static void all_devices_setup_cb(libxl__egc *egc,
libxl__multidev *multidev,
int rc);
static void device_setup_iterate(libxl__egc *egc,
libxl__ao_device *aodev);
static void devices_teardown_cb(libxl__egc *egc,
libxl__multidev *multidev,
int rc);
/* checkpoint device setup and teardown */
static libxl__checkpoint_device* checkpoint_device_init(libxl__egc *egc,
libxl__checkpoint_devices_state *cds,
libxl__device_kind kind,
void *libxl_dev)
{
libxl__checkpoint_device *dev = NULL;
STATE_AO_GC(cds->ao);
GCNEW(dev);
dev->backend_dev = libxl_dev;
dev->kind = kind;
dev->cds = cds;
return dev;
}
static void checkpoint_devices_setup(libxl__egc *egc,
libxl__checkpoint_devices_state *cds);
void libxl__checkpoint_devices_setup(libxl__egc *egc,
libxl__checkpoint_devices_state *cds)
{
int i;
STATE_AO_GC(cds->ao);
cds->num_devices = 0;
cds->num_nics = 0;
cds->num_disks = 0;
if (cds->device_kind_flags & (1 << LIBXL__DEVICE_KIND_VIF))
cds->nics = libxl__device_list(gc, &libxl__nic_devtype, cds->domid,
&cds->num_nics);
if (cds->device_kind_flags & (1 << LIBXL__DEVICE_KIND_VBD))
cds->disks = libxl__device_list(gc, &libxl__disk_devtype, cds->domid,
&cds->num_disks);
if (cds->num_nics == 0 && cds->num_disks == 0)
goto out;
GCNEW_ARRAY(cds->devs, cds->num_nics + cds->num_disks);
for (i = 0; i < cds->num_nics; i++) {
cds->devs[cds->num_devices++] = checkpoint_device_init(egc, cds,
LIBXL__DEVICE_KIND_VIF,
&cds->nics[i]);
}
for (i = 0; i < cds->num_disks; i++) {
cds->devs[cds->num_devices++] = checkpoint_device_init(egc, cds,
LIBXL__DEVICE_KIND_VBD,
&cds->disks[i]);
}
checkpoint_devices_setup(egc, cds);
return;
out:
cds->callback(egc, cds, 0);
}
static void checkpoint_devices_setup(libxl__egc *egc,
libxl__checkpoint_devices_state *cds)
{
int i, rc;
STATE_AO_GC(cds->ao);
libxl__multidev_begin(ao, &cds->multidev);
cds->multidev.callback = all_devices_setup_cb;
for (i = 0; i < cds->num_devices; i++) {
libxl__checkpoint_device *dev = cds->devs[i];
dev->ops_index = -1;
libxl__multidev_prepare_with_aodev(&cds->multidev, &dev->aodev);
dev->aodev.rc = ERROR_CHECKPOINT_DEVICE_NOT_SUPPORTED;
dev->aodev.callback = device_setup_iterate;
device_setup_iterate(egc,&dev->aodev);
}
rc = 0;
libxl__multidev_prepared(egc, &cds->multidev, rc);
}
static void device_setup_iterate(libxl__egc *egc, libxl__ao_device *aodev)
{
libxl__checkpoint_device *dev = CONTAINER_OF(aodev, *dev, aodev);
EGC_GC;
if (aodev->rc != ERROR_CHECKPOINT_DEVICE_NOT_SUPPORTED &&
aodev->rc != ERROR_CHECKPOINT_DEVOPS_DOES_NOT_MATCH)
/* might be success or disaster */
goto out;
do {
dev->ops = dev->cds->ops[++dev->ops_index];
if (!dev->ops) {
libxl_device_nic * nic = NULL;
libxl_device_disk * disk = NULL;
uint32_t domid = INVALID_DOMID;
int devid;
if (dev->kind == LIBXL__DEVICE_KIND_VIF) {
nic = (libxl_device_nic *)dev->backend_dev;
domid = nic->backend_domid;
devid = nic->devid;
} else if (dev->kind == LIBXL__DEVICE_KIND_VBD) {
disk = (libxl_device_disk *)dev->backend_dev;
domid = disk->backend_domid;
devid = libxl__device_disk_dev_number(disk->vdev, NULL, NULL);
} else {
LOGD(ERROR, domid, "device kind not handled by checkpoint: %s",
libxl__device_kind_to_string(dev->kind));
aodev->rc = ERROR_FAIL;
goto out;
}
LOGD(ERROR, domid, "device not handled by checkpoint"
" (device=%s:%"PRId32"/%"PRId32")",
libxl__device_kind_to_string(dev->kind),
domid, devid);
aodev->rc = ERROR_CHECKPOINT_DEVICE_NOT_SUPPORTED;
goto out;
}
} while (dev->ops->kind != dev->kind);
/* found the next ops_index to try */
assert(dev->aodev.callback == device_setup_iterate);
dev->ops->setup(egc,dev);
return;
out:
libxl__multidev_one_callback(egc,aodev);
}
static void all_devices_setup_cb(libxl__egc *egc,
libxl__multidev *multidev,
int rc)
{
STATE_AO_GC(multidev->ao);
/* Convenience aliases */
libxl__checkpoint_devices_state *const cds =
CONTAINER_OF(multidev, *cds, multidev);
cds->callback(egc, cds, rc);
}
void libxl__checkpoint_devices_teardown(libxl__egc *egc,
libxl__checkpoint_devices_state *cds)
{
int i;
libxl__checkpoint_device *dev;
STATE_AO_GC(cds->ao);
libxl__multidev_begin(ao, &cds->multidev);
cds->multidev.callback = devices_teardown_cb;
for (i = 0; i < cds->num_devices; i++) {
dev = cds->devs[i];
if (!dev->ops || !dev->matched)
continue;
libxl__multidev_prepare_with_aodev(&cds->multidev, &dev->aodev);
dev->ops->teardown(egc,dev);
}
libxl__multidev_prepared(egc, &cds->multidev, 0);
}
static void devices_teardown_cb(libxl__egc *egc,
libxl__multidev *multidev,
int rc)
{
STATE_AO_GC(multidev->ao);
/* Convenience aliases */
libxl__checkpoint_devices_state *const cds =
CONTAINER_OF(multidev, *cds, multidev);
/* clean nic */
libxl__device_list_free(&libxl__nic_devtype, cds->nics, cds->num_nics);
cds->nics = NULL;
cds->num_nics = 0;
/* clean disk */
libxl__device_list_free(&libxl__disk_devtype, cds->disks, cds->num_disks);
cds->disks = NULL;
cds->num_disks = 0;
cds->callback(egc, cds, rc);
}
/*----- checkpointing APIs -----*/
/* callbacks */
static void devices_checkpoint_cb(libxl__egc *egc,
libxl__multidev *multidev,
int rc);
/* API implementations */
#define define_checkpoint_api(api) \
void libxl__checkpoint_devices_##api(libxl__egc *egc, \
libxl__checkpoint_devices_state *cds) \
{ \
int i; \
libxl__checkpoint_device *dev; \
\
STATE_AO_GC(cds->ao); \
\
libxl__multidev_begin(ao, &cds->multidev); \
cds->multidev.callback = devices_checkpoint_cb; \
for (i = 0; i < cds->num_devices; i++) { \
dev = cds->devs[i]; \
if (!dev->matched || !dev->ops->api) \
continue; \
libxl__multidev_prepare_with_aodev(&cds->multidev, &dev->aodev);\
dev->ops->api(egc,dev); \
} \
\
libxl__multidev_prepared(egc, &cds->multidev, 0); \
}
define_checkpoint_api(postsuspend);
define_checkpoint_api(preresume);
define_checkpoint_api(commit);
static void devices_checkpoint_cb(libxl__egc *egc,
libxl__multidev *multidev,
int rc)
{
STATE_AO_GC(multidev->ao);
/* Convenience aliases */
libxl__checkpoint_devices_state *const cds =
CONTAINER_OF(multidev, *cds, multidev);
cds->callback(egc, cds, rc);
}
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