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spice/server/char-device.cpp
Frediano Ziglio 1e9205a3b8 char-device: Remove GObject from RedCharDevice 
Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
2020-05-01 06:58:09 +01:00

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/* spice-server char device flow control code
Copyright (C) 2012-2015 Red Hat, Inc.
Red Hat Authors:
Yonit Halperin <yhalperi@redhat.com>
This library 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; either
version 2.1 of the License, or (at your option) any later version.
This library 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.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http:www.gnu.org/licenses/>.
*/
#include <config.h>
#include <inttypes.h>
#include "char-device.h"
#include "reds.h"
#define CHAR_DEVICE_WRITE_TO_TIMEOUT 100
#define RED_CHAR_DEVICE_WAIT_TOKENS_TIMEOUT 30000
typedef enum {
WRITE_BUFFER_ORIGIN_NONE,
WRITE_BUFFER_ORIGIN_CLIENT,
WRITE_BUFFER_ORIGIN_SERVER,
WRITE_BUFFER_ORIGIN_SERVER_NO_TOKEN,
} WriteBufferOrigin;
struct RedCharDeviceWriteBufferPrivate {
RedCharDeviceClientOpaque *client; /* The client that sent the message to the device.
NULL if the server created the message */
WriteBufferOrigin origin;
uint32_t token_price;
uint32_t refs;
};
typedef struct RedCharDeviceClient RedCharDeviceClient;
struct RedCharDeviceClient {
RedCharDevice *dev;
RedCharDeviceClientOpaque *client;
int do_flow_control;
uint64_t num_client_tokens;
uint64_t num_client_tokens_free; /* client messages that were consumed by the device */
uint64_t num_send_tokens; /* send to client */
SpiceTimer *wait_for_tokens_timer;
int wait_for_tokens_started;
GQueue *send_queue;
uint32_t max_send_queue_size;
};
struct RedCharDevicePrivate {
SPICE_CXX_GLIB_ALLOCATOR
int running;
int active; /* has read/write been performed since the device was started */
int wait_for_migrate_data;
GQueue write_queue;
RedCharDeviceWriteBuffer *cur_write_buf;
uint8_t *cur_write_buf_pos;
SpiceTimer *write_to_dev_timer;
uint64_t num_self_tokens;
GList *clients; /* list of RedCharDeviceClient */
uint64_t client_tokens_interval; /* frequency of returning tokens to the client */
SpiceCharDeviceInstance *sin;
int during_read_from_device;
int during_write_to_device;
SpiceServer *reds;
};
static void red_char_device_write_buffer_unref(RedCharDeviceWriteBuffer *write_buf);
void
RedCharDevice::send_tokens_to_client(RedCharDeviceClientOpaque *client, uint32_t tokens)
{
g_warn_if_reached();
}
static void red_char_device_write_buffer_free(RedCharDeviceWriteBuffer *buf)
{
if (buf) {
g_free(buf->priv);
}
/* NOTE: do not free buf. buf was contained into a larger structure
* which contained both private and public part and was freed above */
}
static void write_buffers_queue_free(GQueue *write_queue)
{
RedCharDeviceWriteBuffer *buf;
while ((buf = (RedCharDeviceWriteBuffer *) g_queue_pop_tail(write_queue)))
red_char_device_write_buffer_free(buf);
}
static void red_char_device_client_free(RedCharDevice *dev,
RedCharDeviceClient *dev_client)
{
GList *l, *next;
red_timer_remove(dev_client->wait_for_tokens_timer);
dev_client->wait_for_tokens_timer = NULL;
g_queue_free_full(dev_client->send_queue, (GDestroyNotify)red_pipe_item_unref);
/* remove write buffers that are associated with the client */
spice_debug("write_queue_is_empty %d", g_queue_is_empty(&dev->priv->write_queue) && !dev->priv->cur_write_buf);
l = g_queue_peek_head_link(&dev->priv->write_queue);
while (l) {
RedCharDeviceWriteBuffer *write_buf = (RedCharDeviceWriteBuffer *) l->data;
next = l->next;
if (write_buf->priv->origin == WRITE_BUFFER_ORIGIN_CLIENT &&
write_buf->priv->client == dev_client->client) {
g_queue_delete_link(&dev->priv->write_queue, l);
red_char_device_write_buffer_unref(write_buf);
}
l = next;
}
if (dev->priv->cur_write_buf && dev->priv->cur_write_buf->priv->origin == WRITE_BUFFER_ORIGIN_CLIENT &&
dev->priv->cur_write_buf->priv->client == dev_client->client) {
dev->priv->cur_write_buf->priv->origin = WRITE_BUFFER_ORIGIN_NONE;
dev->priv->cur_write_buf->priv->client = NULL;
}
dev->priv->clients = g_list_remove(dev->priv->clients, dev_client);
g_free(dev_client);
}
static void red_char_device_handle_client_overflow(RedCharDeviceClient *dev_client)
{
RedCharDevice *dev = dev_client->dev;
dev->remove_client(dev_client->client);
}
static RedCharDeviceClient *red_char_device_client_find(RedCharDevice *dev,
RedCharDeviceClientOpaque *client)
{
RedCharDeviceClient *dev_client;
GLIST_FOREACH(dev->priv->clients, RedCharDeviceClient, dev_client) {
if (dev_client->client == client) {
return dev_client;
}
}
return NULL;
}
/***************************
* Reading from the device *
**************************/
static void device_client_wait_for_tokens_timeout(RedCharDeviceClient *dev_client)
{
red_char_device_handle_client_overflow(dev_client);
}
static int red_char_device_can_send_to_client(RedCharDeviceClient *dev_client)
{
return !dev_client->do_flow_control || dev_client->num_send_tokens;
}
static uint64_t red_char_device_max_send_tokens(RedCharDevice *dev)
{
RedCharDeviceClient *dev_client;
uint64_t max = 0;
GLIST_FOREACH(dev->priv->clients, RedCharDeviceClient, dev_client) {
if (!dev_client->do_flow_control) {
max = ~0;
break;
}
if (dev_client->num_send_tokens > max) {
max = dev_client->num_send_tokens;
}
}
return max;
}
static void red_char_device_add_msg_to_client_queue(RedCharDeviceClient *dev_client,
RedPipeItem *msg)
{
if (g_queue_get_length(dev_client->send_queue) >= dev_client->max_send_queue_size) {
red_char_device_handle_client_overflow(dev_client);
return;
}
red_pipe_item_ref(msg);
g_queue_push_head(dev_client->send_queue, msg);
if (!dev_client->wait_for_tokens_started) {
red_timer_start(dev_client->wait_for_tokens_timer,
RED_CHAR_DEVICE_WAIT_TOKENS_TIMEOUT);
dev_client->wait_for_tokens_started = TRUE;
}
}
static void red_char_device_send_msg_to_clients(RedCharDevice *dev,
RedPipeItem *msg)
{
RedCharDeviceClient *dev_client;
GLIST_FOREACH(dev->priv->clients, RedCharDeviceClient, dev_client) {
if (red_char_device_can_send_to_client(dev_client)) {
dev_client->num_send_tokens--;
spice_assert(g_queue_is_empty(dev_client->send_queue));
dev->send_msg_to_client(msg, dev_client->client);
/* don't refer to dev_client anymore, it may have been released */
} else {
red_char_device_add_msg_to_client_queue(dev_client, msg);
}
}
}
static bool red_char_device_read_from_device(RedCharDevice *dev)
{
uint64_t max_send_tokens;
int did_read = FALSE;
if (!dev->priv->running || dev->priv->wait_for_migrate_data || !dev->priv->sin) {
return FALSE;
}
/* There are 2 scenarios where we can get called recursively:
* 1) spice-vmc vmc_read triggering flush of throttled data, recalling wakeup
* (virtio)
* 2) in case of sending messages to the client, and unreferencing the
* msg, we trigger another read.
*/
if (dev->priv->during_read_from_device++ > 0) {
return FALSE;
}
max_send_tokens = red_char_device_max_send_tokens(dev);
red::shared_ptr<RedCharDevice> hold_dev(dev);
/*
* Reading from the device only in case at least one of the clients have a free token.
* All messages will be discarded if no client is attached to the device
*/
while ((max_send_tokens || (dev->priv->clients == NULL)) && dev->priv->running) {
RedPipeItem *msg;
msg = dev->read_one_msg_from_device(dev->priv->sin);
if (!msg) {
if (dev->priv->during_read_from_device > 1) {
dev->priv->during_read_from_device = 1;
continue; /* a wakeup might have been called during the read -
make sure it doesn't get lost */
}
break;
}
did_read = TRUE;
red_char_device_send_msg_to_clients(dev, msg);
red_pipe_item_unref(msg);
max_send_tokens--;
}
dev->priv->during_read_from_device = 0;
if (dev->priv->running) {
dev->priv->active = dev->priv->active || did_read;
}
return did_read;
}
static void red_char_device_client_send_queue_push(RedCharDeviceClient *dev_client)
{
while (!g_queue_is_empty(dev_client->send_queue) &&
red_char_device_can_send_to_client(dev_client)) {
RedPipeItem *msg = (RedPipeItem *) g_queue_pop_tail(dev_client->send_queue);
g_assert(msg != NULL);
dev_client->num_send_tokens--;
dev_client->dev->send_msg_to_client(msg, dev_client->client);
red_pipe_item_unref(msg);
}
}
static void
red_char_device_send_to_client_tokens_absorb(RedCharDevice *dev,
RedCharDeviceClientOpaque *client,
uint32_t tokens,
bool reset)
{
RedCharDeviceClient *dev_client;
dev_client = red_char_device_client_find(dev, client);
if (!dev_client) {
spice_error("client wasn't found dev %p client %p", dev, client);
return;
}
if (reset) {
dev_client->num_send_tokens = 0;
}
dev_client->num_send_tokens += tokens;
if (g_queue_get_length(dev_client->send_queue)) {
spice_assert(dev_client->num_send_tokens == tokens);
red_char_device_client_send_queue_push(dev_client);
}
if (red_char_device_can_send_to_client(dev_client)) {
red_timer_cancel(dev_client->wait_for_tokens_timer);
dev_client->wait_for_tokens_started = FALSE;
red_char_device_read_from_device(dev_client->dev);
} else if (!g_queue_is_empty(dev_client->send_queue)) {
red_timer_start(dev_client->wait_for_tokens_timer,
RED_CHAR_DEVICE_WAIT_TOKENS_TIMEOUT);
dev_client->wait_for_tokens_started = TRUE;
}
}
void RedCharDevice::send_to_client_tokens_add(RedCharDeviceClientOpaque *client,
uint32_t tokens)
{
red_char_device_send_to_client_tokens_absorb(this, client, tokens, false);
}
void RedCharDevice::send_to_client_tokens_set(RedCharDeviceClientOpaque *client,
uint32_t tokens)
{
red_char_device_send_to_client_tokens_absorb(this, client, tokens, true);
}
/**************************
* Writing to the device *
***************************/
static void red_char_device_client_tokens_add(RedCharDevice *dev,
RedCharDeviceClient *dev_client,
uint32_t num_tokens)
{
if (!dev_client->do_flow_control) {
return;
}
if (num_tokens > 1) {
spice_debug("#tokens > 1 (=%u)", num_tokens);
}
dev_client->num_client_tokens_free += num_tokens;
if (dev_client->num_client_tokens_free >= dev->priv->client_tokens_interval) {
uint32_t tokens = dev_client->num_client_tokens_free;
dev_client->num_client_tokens += dev_client->num_client_tokens_free;
dev_client->num_client_tokens_free = 0;
dev->send_tokens_to_client(dev_client->client, tokens);
}
}
int RedCharDevice::write_to_device()
{
SpiceCharDeviceInterface *sif;
int total = 0;
int n;
if (!priv->running || priv->wait_for_migrate_data || !priv->sin) {
return 0;
}
/* protect against recursion with red_char_device_wakeup */
if (priv->during_write_to_device++ > 0) {
return 0;
}
red::shared_ptr<RedCharDevice> hold_dev(this);
if (priv->write_to_dev_timer) {
red_timer_cancel(priv->write_to_dev_timer);
}
sif = spice_char_device_get_interface(priv->sin);
while (priv->running) {
uint32_t write_len;
if (!priv->cur_write_buf) {
priv->cur_write_buf = (RedCharDeviceWriteBuffer *) g_queue_pop_tail(&priv->write_queue);
if (!priv->cur_write_buf)
break;
priv->cur_write_buf_pos = priv->cur_write_buf->buf;
}
write_len = priv->cur_write_buf->buf + priv->cur_write_buf->buf_used -
priv->cur_write_buf_pos;
n = sif->write(priv->sin, priv->cur_write_buf_pos, write_len);
if (n <= 0) {
if (priv->during_write_to_device > 1) {
priv->during_write_to_device = 1;
continue; /* a wakeup might have been called during the write -
make sure it doesn't get lost */
}
break;
}
total += n;
write_len -= n;
if (!write_len) {
write_buffer_release(&priv->cur_write_buf);
continue;
}
priv->cur_write_buf_pos += n;
}
/* retry writing as long as the write queue is not empty */
if (priv->running) {
if (priv->cur_write_buf) {
if (priv->write_to_dev_timer) {
red_timer_start(priv->write_to_dev_timer,
CHAR_DEVICE_WRITE_TO_TIMEOUT);
}
} else {
spice_assert(g_queue_is_empty(&priv->write_queue));
}
priv->active = priv->active || total;
}
priv->during_write_to_device = 0;
return total;
}
void RedCharDevice::write_retry(RedCharDevice *dev)
{
if (dev->priv->write_to_dev_timer) {
red_timer_cancel(dev->priv->write_to_dev_timer);
}
dev->write_to_device();
}
static RedCharDeviceWriteBuffer *
red_char_device_write_buffer_get(RedCharDevice *dev, RedCharDeviceClientOpaque *client, int size,
WriteBufferOrigin origin, int migrated_data_tokens)
{
RedCharDeviceWriteBuffer *ret;
if (origin == WRITE_BUFFER_ORIGIN_SERVER && !dev->priv->num_self_tokens) {
return NULL;
}
struct RedCharDeviceWriteBufferFull {
RedCharDeviceWriteBufferPrivate priv;
RedCharDeviceWriteBuffer buffer;
} *write_buf;
write_buf = (struct RedCharDeviceWriteBufferFull* )
g_malloc(sizeof(struct RedCharDeviceWriteBufferFull) + size);
memset(write_buf, 0, sizeof(*write_buf));
write_buf->priv.refs = 1;
ret = &write_buf->buffer;
ret->buf_size = size;
ret->priv = &write_buf->priv;
spice_assert(!ret->buf_used);
ret->priv->origin = origin;
if (origin == WRITE_BUFFER_ORIGIN_CLIENT) {
spice_assert(client);
RedCharDeviceClient *dev_client = red_char_device_client_find(dev, client);
if (dev_client) {
if (!migrated_data_tokens &&
dev_client->do_flow_control && !dev_client->num_client_tokens) {
g_warning("token violation: dev %p client %p", dev, client);
red_char_device_handle_client_overflow(dev_client);
goto error;
}
ret->priv->client = client;
if (!migrated_data_tokens && dev_client->do_flow_control) {
dev_client->num_client_tokens--;
}
} else {
/* it is possible that the client was removed due to send tokens underflow, but
* the caller still receive messages from the client */
g_warning("client not found: dev %p client %p", dev, client);
goto error;
}
} else if (origin == WRITE_BUFFER_ORIGIN_SERVER) {
dev->priv->num_self_tokens--;
}
ret->priv->token_price = migrated_data_tokens ? migrated_data_tokens : 1;
ret->priv->refs = 1;
return ret;
error:
red_char_device_write_buffer_free(ret);
return NULL;
}
RedCharDeviceWriteBuffer *RedCharDevice::write_buffer_get_client(RedCharDeviceClientOpaque *client,
int size)
{
spice_assert(client);
return red_char_device_write_buffer_get(this, client, size, WRITE_BUFFER_ORIGIN_CLIENT, 0);
}
RedCharDeviceWriteBuffer *RedCharDevice::write_buffer_get_server(int size,
bool use_token)
{
WriteBufferOrigin origin =
use_token ? WRITE_BUFFER_ORIGIN_SERVER : WRITE_BUFFER_ORIGIN_SERVER_NO_TOKEN;
return red_char_device_write_buffer_get(this, NULL, size, origin, 0);
}
static RedCharDeviceWriteBuffer *red_char_device_write_buffer_ref(RedCharDeviceWriteBuffer *write_buf)
{
spice_assert(write_buf);
write_buf->priv->refs++;
return write_buf;
}
static void red_char_device_write_buffer_unref(RedCharDeviceWriteBuffer *write_buf)
{
spice_assert(write_buf);
write_buf->priv->refs--;
if (write_buf->priv->refs == 0)
red_char_device_write_buffer_free(write_buf);
}
void RedCharDevice::write_buffer_add(RedCharDeviceWriteBuffer *write_buf)
{
/* caller shouldn't add buffers for client that was removed */
if (write_buf->priv->origin == WRITE_BUFFER_ORIGIN_CLIENT &&
!red_char_device_client_find(this, write_buf->priv->client)) {
g_warning("client not found: this %p client %p", this, write_buf->priv->client);
red_char_device_write_buffer_unref(write_buf);
return;
}
g_queue_push_head(&priv->write_queue, write_buf);
write_to_device();
}
void RedCharDevice::write_buffer_release(RedCharDevice *dev,
RedCharDeviceWriteBuffer **p_write_buf)
{
RedCharDeviceWriteBuffer *write_buf = *p_write_buf;
if (!write_buf) {
return;
}
*p_write_buf = NULL;
WriteBufferOrigin buf_origin = write_buf->priv->origin;
uint32_t buf_token_price = write_buf->priv->token_price;
RedCharDeviceClientOpaque *client = write_buf->priv->client;
if (!dev) {
g_warning("no device. write buffer is freed");
red_char_device_write_buffer_free(write_buf);
return;
}
spice_assert(dev->priv->cur_write_buf != write_buf);
red_char_device_write_buffer_unref(write_buf);
if (buf_origin == WRITE_BUFFER_ORIGIN_CLIENT) {
RedCharDeviceClient *dev_client;
spice_assert(client);
dev_client = red_char_device_client_find(dev, client);
/* when a client is removed, we remove all the buffers that are associated with it */
spice_assert(dev_client);
red_char_device_client_tokens_add(dev, dev_client, buf_token_price);
} else if (buf_origin == WRITE_BUFFER_ORIGIN_SERVER) {
dev->priv->num_self_tokens++;
dev->on_free_self_token();
}
}
/********************************
* char_device_state management *
********************************/
void RedCharDevice::reset_dev_instance(SpiceCharDeviceInstance *sin)
{
spice_debug("sin %p, char device %p", sin, this);
priv->sin = sin;
if (sin) {
sin->st = this;
}
if (priv->reds) {
init_device_instance();
}
}
static RedCharDeviceClient *
red_char_device_client_new(RedsState *reds,
RedCharDeviceClientOpaque *client,
int do_flow_control,
uint32_t max_send_queue_size,
uint32_t num_client_tokens,
uint32_t num_send_tokens)
{
RedCharDeviceClient *dev_client;
dev_client = g_new0(RedCharDeviceClient, 1);
dev_client->client = client;
dev_client->send_queue = g_queue_new();
dev_client->max_send_queue_size = max_send_queue_size;
dev_client->do_flow_control = do_flow_control;
if (do_flow_control) {
dev_client->wait_for_tokens_timer =
reds_core_timer_add(reds, device_client_wait_for_tokens_timeout,
dev_client);
if (!dev_client->wait_for_tokens_timer) {
spice_error("failed to create wait for tokens timer");
}
dev_client->num_client_tokens = num_client_tokens;
dev_client->num_send_tokens = num_send_tokens;
} else {
dev_client->num_client_tokens = ~0;
dev_client->num_send_tokens = ~0;
}
return dev_client;
}
bool RedCharDevice::client_add(RedCharDeviceClientOpaque *client,
int do_flow_control,
uint32_t max_send_queue_size,
uint32_t num_client_tokens,
uint32_t num_send_tokens,
int wait_for_migrate_data)
{
RedCharDeviceClient *dev_client;
spice_assert(client);
if (wait_for_migrate_data && (priv->clients != NULL || priv->active)) {
spice_warning("can't restore device %p from migration data. The device "
"has already been active", this);
return FALSE;
}
priv->wait_for_migrate_data = wait_for_migrate_data;
spice_debug("char device %p, client %p", this, client);
dev_client = red_char_device_client_new(priv->reds,
client,
do_flow_control,
max_send_queue_size,
num_client_tokens,
num_send_tokens);
dev_client->dev = this;
priv->clients = g_list_prepend(priv->clients, dev_client);
/* Now that we have a client, forward any pending device data */
wakeup();
return TRUE;
}
void RedCharDevice::client_remove(RedCharDeviceClientOpaque *client)
{
RedCharDeviceClient *dev_client;
spice_debug("char device %p, client %p", this, client);
dev_client = red_char_device_client_find(this, client);
if (!dev_client) {
spice_error("client wasn't found");
return;
}
red_char_device_client_free(this, dev_client);
if (priv->wait_for_migrate_data) {
spice_assert(priv->clients == NULL);
priv->wait_for_migrate_data = FALSE;
red_char_device_read_from_device(this);
}
}
int RedCharDevice::client_exists(RedCharDeviceClientOpaque *client)
{
return (red_char_device_client_find(this, client) != NULL);
}
void RedCharDevice::start()
{
spice_debug("char device %p", this);
priv->running = TRUE;
red::shared_ptr<RedCharDevice> hold_dev(this);
while (write_to_device() ||
red_char_device_read_from_device(this));
}
void RedCharDevice::stop()
{
spice_debug("char device %p", this);
priv->running = FALSE;
priv->active = FALSE;
if (priv->write_to_dev_timer) {
red_timer_cancel(priv->write_to_dev_timer);
}
}
void RedCharDevice::reset()
{
RedCharDeviceClient *dev_client;
RedCharDeviceWriteBuffer *buf;
priv->wait_for_migrate_data = FALSE;
spice_debug("char device %p", this);
while ((buf = (RedCharDeviceWriteBuffer *) g_queue_pop_tail(&priv->write_queue))) {
write_buffer_release(&buf);
}
write_buffer_release(&priv->cur_write_buf);
GLIST_FOREACH(priv->clients, RedCharDeviceClient, dev_client) {
spice_debug("send_queue_empty %d", g_queue_is_empty(dev_client->send_queue));
dev_client->num_send_tokens += g_queue_get_length(dev_client->send_queue);
g_queue_free_full(dev_client->send_queue, (GDestroyNotify)red_pipe_item_unref);
dev_client->send_queue = g_queue_new();
/* If device is reset, we must reset the tokens counters as well as we
* don't hold any data from client and upon agent's reconnection we send
* SPICE_MSG_MAIN_AGENT_CONNECTED_TOKENS with all free tokens we have */
dev_client->num_client_tokens += dev_client->num_client_tokens_free;
dev_client->num_client_tokens_free = 0;
}
}
void RedCharDevice::wakeup()
{
write_to_device();
red_char_device_read_from_device(this);
}
/*************
* Migration *
* **********/
void RedCharDevice::migrate_data_marshall_empty(SpiceMarshaller *m)
{
SpiceMigrateDataCharDevice *mig_data;
spice_debug("trace");
mig_data = (SpiceMigrateDataCharDevice *)spice_marshaller_reserve_space(m,
sizeof(*mig_data));
memset(mig_data, 0, sizeof(*mig_data));
mig_data->version = SPICE_MIGRATE_DATA_CHAR_DEVICE_VERSION;
mig_data->connected = FALSE;
}
static void migrate_data_marshaller_write_buffer_free(uint8_t *data, void *opaque)
{
RedCharDeviceWriteBuffer *write_buf = (RedCharDeviceWriteBuffer *)opaque;
red_char_device_write_buffer_unref(write_buf);
}
void RedCharDevice::migrate_data_marshall(SpiceMarshaller *m)
{
RedCharDeviceClient *dev_client;
GList *item;
uint8_t *write_to_dev_sizes_ptr;
uint32_t write_to_dev_size;
uint32_t write_to_dev_tokens;
SpiceMarshaller *m2;
/* multi-clients are not supported */
spice_assert(g_list_length(priv->clients) == 1);
dev_client = (RedCharDeviceClient *) g_list_last(priv->clients)->data;
/* FIXME: if there were more than one client before the marshalling,
* it is possible that the send_queue length > 0, and the send data
* should be migrated as well */
spice_assert(g_queue_is_empty(dev_client->send_queue));
spice_marshaller_add_uint32(m, SPICE_MIGRATE_DATA_CHAR_DEVICE_VERSION);
spice_marshaller_add_uint8(m, 1); /* connected */
spice_marshaller_add_uint32(m, dev_client->num_client_tokens);
spice_marshaller_add_uint32(m, dev_client->num_send_tokens);
write_to_dev_sizes_ptr = spice_marshaller_reserve_space(m, sizeof(uint32_t)*2);
write_to_dev_size = 0;
write_to_dev_tokens = 0;
m2 = spice_marshaller_get_ptr_submarshaller(m);
if (priv->cur_write_buf) {
uint32_t buf_remaining = priv->cur_write_buf->buf + priv->cur_write_buf->buf_used -
priv->cur_write_buf_pos;
spice_marshaller_add_by_ref_full(m2, priv->cur_write_buf_pos, buf_remaining,
migrate_data_marshaller_write_buffer_free,
red_char_device_write_buffer_ref(priv->cur_write_buf)
);
write_to_dev_size += buf_remaining;
if (priv->cur_write_buf->priv->origin == WRITE_BUFFER_ORIGIN_CLIENT) {
spice_assert(priv->cur_write_buf->priv->client == dev_client->client);
write_to_dev_tokens += priv->cur_write_buf->priv->token_price;
}
}
for (item = g_queue_peek_tail_link(&priv->write_queue); item != NULL; item = item->prev) {
RedCharDeviceWriteBuffer *write_buf = (RedCharDeviceWriteBuffer *) item->data;
spice_marshaller_add_by_ref_full(m2, write_buf->buf, write_buf->buf_used,
migrate_data_marshaller_write_buffer_free,
red_char_device_write_buffer_ref(write_buf)
);
write_to_dev_size += write_buf->buf_used;
if (write_buf->priv->origin == WRITE_BUFFER_ORIGIN_CLIENT) {
spice_assert(write_buf->priv->client == dev_client->client);
write_to_dev_tokens += write_buf->priv->token_price;
}
}
spice_debug("migration data dev %p: write_queue size %u tokens %u",
this, write_to_dev_size, write_to_dev_tokens);
spice_marshaller_set_uint32(m, write_to_dev_sizes_ptr, write_to_dev_size);
spice_marshaller_set_uint32(m, write_to_dev_sizes_ptr + sizeof(uint32_t), write_to_dev_tokens);
}
bool RedCharDevice::restore(SpiceMigrateDataCharDevice *mig_data)
{
RedCharDeviceClient *dev_client;
uint32_t client_tokens_window;
spice_assert(g_list_length(priv->clients) == 1 &&
priv->wait_for_migrate_data);
dev_client = (RedCharDeviceClient *) g_list_last(priv->clients)->data;
if (mig_data->version > SPICE_MIGRATE_DATA_CHAR_DEVICE_VERSION) {
spice_error("dev %p error: migration data version %u is bigger than self %u",
this, mig_data->version, SPICE_MIGRATE_DATA_CHAR_DEVICE_VERSION);
return FALSE;
}
spice_assert(!priv->cur_write_buf && g_queue_is_empty(&priv->write_queue));
spice_assert(mig_data->connected);
client_tokens_window = dev_client->num_client_tokens; /* initial state of tokens */
dev_client->num_client_tokens = mig_data->num_client_tokens;
/* assumption: client_tokens_window stays the same across severs */
dev_client->num_client_tokens_free = client_tokens_window -
mig_data->num_client_tokens -
mig_data->write_num_client_tokens;
dev_client->num_send_tokens = mig_data->num_send_tokens;
if (mig_data->write_size > 0) {
if (mig_data->write_num_client_tokens) {
priv->cur_write_buf =
red_char_device_write_buffer_get(this, dev_client->client,
mig_data->write_size, WRITE_BUFFER_ORIGIN_CLIENT,
mig_data->write_num_client_tokens);
} else {
priv->cur_write_buf =
red_char_device_write_buffer_get(this, NULL,
mig_data->write_size, WRITE_BUFFER_ORIGIN_SERVER, 0);
}
/* the first write buffer contains all the data that was saved for migration */
memcpy(priv->cur_write_buf->buf,
((uint8_t *)mig_data) + mig_data->write_data_ptr - sizeof(SpiceMigrateDataHeader),
mig_data->write_size);
priv->cur_write_buf->buf_used = mig_data->write_size;
priv->cur_write_buf_pos = priv->cur_write_buf->buf;
}
priv->wait_for_migrate_data = FALSE;
write_to_device();
red_char_device_read_from_device(this);
return TRUE;
}
SpiceServer* RedCharDevice::get_server()
{
return priv->reds;
}
SpiceCharDeviceInterface *spice_char_device_get_interface(SpiceCharDeviceInstance *instance)
{
return SPICE_UPCAST(SpiceCharDeviceInterface, instance->base.sif);
}
void RedCharDevice::init_device_instance()
{
SpiceCharDeviceInterface *sif;
g_return_if_fail(priv->reds);
red_timer_remove(priv->write_to_dev_timer);
priv->write_to_dev_timer = NULL;
if (priv->sin == NULL) {
return;
}
sif = spice_char_device_get_interface(priv->sin);
if (sif->base.minor_version <= 2 ||
!(sif->flags & SPICE_CHAR_DEVICE_NOTIFY_WRITABLE)) {
priv->write_to_dev_timer = reds_core_timer_add(priv->reds,
RedCharDevice::write_retry,
this);
if (!priv->write_to_dev_timer) {
spice_error("failed creating char dev write timer");
}
}
priv->sin->st = this;
}
RedCharDevice::~RedCharDevice()
{
red_timer_remove(priv->write_to_dev_timer);
priv->write_to_dev_timer = NULL;
write_buffers_queue_free(&priv->write_queue);
red_char_device_write_buffer_free(priv->cur_write_buf);
priv->cur_write_buf = NULL;
while (priv->clients != NULL) {
RedCharDeviceClient *dev_client = (RedCharDeviceClient *) priv->clients->data;
red_char_device_client_free(this, dev_client);
}
priv->running = FALSE;
}
void
RedCharDevice::port_event(uint8_t event)
{
}
SPICE_GNUC_VISIBLE void spice_server_port_event(SpiceCharDeviceInstance *sin, uint8_t event)
{
if (sin->st == NULL) {
spice_warning("no RedCharDevice attached to instance %p", sin);
return;
}
sin->st->port_event(event);
}
SpiceCharDeviceInstance *RedCharDevice::get_device_instance()
{
return priv->sin;
}
RedCharDevice::RedCharDevice(RedsState *reds, SpiceCharDeviceInstance *sin,
uint64_t client_tokens_interval, uint64_t num_self_tokens)
{
priv->reds = reds;
priv->client_tokens_interval = client_tokens_interval;
priv->num_self_tokens = num_self_tokens;
reset_dev_instance(sin);
g_queue_init(&priv->write_queue);
}
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