qemu/bootdevice.c

259 lines
7.0 KiB
C

/*
* QEMU Boot Device Implement
*
* Copyright (c) 2014 HUAWEI TECHNOLOGIES CO.,LTD.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysemu/sysemu.h"
#include "qapi/visitor.h"
#include "qemu/error-report.h"
typedef struct FWBootEntry FWBootEntry;
struct FWBootEntry {
QTAILQ_ENTRY(FWBootEntry) link;
int32_t bootindex;
DeviceState *dev;
char *suffix;
};
static QTAILQ_HEAD(, FWBootEntry) fw_boot_order =
QTAILQ_HEAD_INITIALIZER(fw_boot_order);
void check_boot_index(int32_t bootindex, Error **errp)
{
FWBootEntry *i;
if (bootindex >= 0) {
QTAILQ_FOREACH(i, &fw_boot_order, link) {
if (i->bootindex == bootindex) {
error_setg(errp, "The bootindex %d has already been used",
bootindex);
return;
}
}
}
}
void del_boot_device_path(DeviceState *dev, const char *suffix)
{
FWBootEntry *i;
if (dev == NULL) {
return;
}
QTAILQ_FOREACH(i, &fw_boot_order, link) {
if ((!suffix || !g_strcmp0(i->suffix, suffix)) &&
i->dev == dev) {
QTAILQ_REMOVE(&fw_boot_order, i, link);
g_free(i->suffix);
g_free(i);
break;
}
}
}
void add_boot_device_path(int32_t bootindex, DeviceState *dev,
const char *suffix)
{
FWBootEntry *node, *i;
if (bootindex < 0) {
del_boot_device_path(dev, suffix);
return;
}
assert(dev != NULL || suffix != NULL);
del_boot_device_path(dev, suffix);
node = g_malloc0(sizeof(FWBootEntry));
node->bootindex = bootindex;
node->suffix = g_strdup(suffix);
node->dev = dev;
QTAILQ_FOREACH(i, &fw_boot_order, link) {
if (i->bootindex == bootindex) {
error_report("Two devices with same boot index %d", bootindex);
exit(1);
} else if (i->bootindex < bootindex) {
continue;
}
QTAILQ_INSERT_BEFORE(i, node, link);
return;
}
QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
}
DeviceState *get_boot_device(uint32_t position)
{
uint32_t counter = 0;
FWBootEntry *i = NULL;
DeviceState *res = NULL;
if (!QTAILQ_EMPTY(&fw_boot_order)) {
QTAILQ_FOREACH(i, &fw_boot_order, link) {
if (counter == position) {
res = i->dev;
break;
}
counter++;
}
}
return res;
}
/*
* This function returns null terminated string that consist of new line
* separated device paths.
*
* memory pointed by "size" is assigned total length of the array in bytes
*
*/
char *get_boot_devices_list(size_t *size, bool ignore_suffixes)
{
FWBootEntry *i;
size_t total = 0;
char *list = NULL;
QTAILQ_FOREACH(i, &fw_boot_order, link) {
char *devpath = NULL, *bootpath;
size_t len;
if (i->dev) {
devpath = qdev_get_fw_dev_path(i->dev);
assert(devpath);
}
if (i->suffix && !ignore_suffixes && devpath) {
size_t bootpathlen = strlen(devpath) + strlen(i->suffix) + 1;
bootpath = g_malloc(bootpathlen);
snprintf(bootpath, bootpathlen, "%s%s", devpath, i->suffix);
g_free(devpath);
} else if (devpath) {
bootpath = devpath;
} else if (!ignore_suffixes) {
assert(i->suffix);
bootpath = g_strdup(i->suffix);
} else {
bootpath = g_strdup("");
}
if (total) {
list[total-1] = '\n';
}
len = strlen(bootpath) + 1;
list = g_realloc(list, total + len);
memcpy(&list[total], bootpath, len);
total += len;
g_free(bootpath);
}
*size = total;
if (boot_strict && *size > 0) {
list[total-1] = '\n';
list = g_realloc(list, total + 5);
memcpy(&list[total], "HALT", 5);
*size = total + 5;
}
return list;
}
typedef struct {
int32_t *bootindex;
const char *suffix;
DeviceState *dev;
} BootIndexProperty;
static void device_get_bootindex(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
BootIndexProperty *prop = opaque;
visit_type_int32(v, prop->bootindex, name, errp);
}
static void device_set_bootindex(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
BootIndexProperty *prop = opaque;
int32_t boot_index;
Error *local_err = NULL;
visit_type_int32(v, &boot_index, name, &local_err);
if (local_err) {
goto out;
}
/* check whether bootindex is present in fw_boot_order list */
check_boot_index(boot_index, &local_err);
if (local_err) {
goto out;
}
/* change bootindex to a new one */
*prop->bootindex = boot_index;
add_boot_device_path(*prop->bootindex, prop->dev, prop->suffix);
out:
if (local_err) {
error_propagate(errp, local_err);
}
}
static void property_release_bootindex(Object *obj, const char *name,
void *opaque)
{
BootIndexProperty *prop = opaque;
del_boot_device_path(prop->dev, prop->suffix);
g_free(prop);
}
void device_add_bootindex_property(Object *obj, int32_t *bootindex,
const char *name, const char *suffix,
DeviceState *dev, Error **errp)
{
Error *local_err = NULL;
BootIndexProperty *prop = g_malloc0(sizeof(*prop));
prop->bootindex = bootindex;
prop->suffix = suffix;
prop->dev = dev;
object_property_add(obj, name, "int32",
device_get_bootindex,
device_set_bootindex,
property_release_bootindex,
prop, &local_err);
if (local_err) {
error_propagate(errp, local_err);
g_free(prop);
return;
}
/* initialize devices' bootindex property to -1 */
object_property_set_int(obj, -1, name, NULL);
}