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incubator-nuttx/drivers/vhost/vhost.c

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/****************************************************************************
* drivers/vhost/vhost.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/mutex.h>
#include <nuttx/wqueue.h>
#include <nuttx/vhost/vhost.h>
#include "vhost-rng.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define VHOST_DEFERED_PROBE_PERIOD 100
/****************************************************************************
* Private Types
****************************************************************************/
struct vhost_bus_s
{
mutex_t lock; /* Lock for the list */
struct list_node device; /* Wait match vhost device list */
struct list_node defered_device; /* Defered vhost device list */
struct list_node driver; /* Vhost driver list */
struct work_s defered_work; /* Defered probe work */
};
struct vhost_device_item_s
{
struct list_node node; /* List node */
struct vhost_device *device; /* Pointer to the vhost device */
struct vhost_driver *driver; /* Pointer to the vhost driver that
* matched with current vhost device
*/
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct vhost_bus_s g_vhost_bus =
{
NXMUTEX_INITIALIZER,
LIST_INITIAL_VALUE(g_vhost_bus.device),
LIST_INITIAL_VALUE(g_vhost_bus.defered_device),
LIST_INITIAL_VALUE(g_vhost_bus.driver),
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: vhost_status_driver_ok
****************************************************************************/
static bool vhost_status_driver_ok(FAR struct vhost_device *hdev)
{
uint8_t status = vhost_get_status(hdev);
bool driver_ok = false;
/* Busy wait until the remote is ready */
if (status & VIRTIO_CONFIG_STATUS_NEEDS_RESET)
{
vhost_set_status(hdev, 0);
}
else if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
{
driver_ok = true;
}
return driver_ok;
}
/****************************************************************************
* Name: vhost_defered_probe_work
****************************************************************************/
static void vhost_defered_probe_work(FAR void *arg)
{
FAR struct vhost_device_item_s *item;
FAR struct vhost_device_item_s *tmp;
FAR struct vhost_driver *driver;
nxmutex_lock(&g_vhost_bus.lock);
list_for_every_entry_safe(&g_vhost_bus.defered_device, item, tmp,
struct vhost_device_item_s, node)
{
if (!vhost_status_driver_ok(item->device))
{
vhosterr("device is not ok device=%p\n", item->device);
continue;
}
/* Vhost device (virtio driver) status has been OK, move it to the
* normal device list
*/
list_delete(&item->node);
list_add_tail(&g_vhost_bus.device, &item->node);
list_for_every_entry(&g_vhost_bus.driver, driver,
struct vhost_driver, node)
{
if (item->device->id.device == driver->device)
{
item->device->priv = driver;
if (driver->probe(item->device) >= 0)
{
vhosterr("device probe success device=%p\n", item->device);
item->driver = driver;
break;
}
}
}
}
if (!list_is_empty(&g_vhost_bus.defered_device))
{
work_queue(LPWORK, &g_vhost_bus.defered_work, vhost_defered_probe_work,
NULL, VHOST_DEFERED_PROBE_PERIOD);
}
nxmutex_unlock(&g_vhost_bus.lock);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: vhost_register_driver
****************************************************************************/
int vhost_register_driver(FAR struct vhost_driver *driver)
{
FAR struct vhost_device_item_s *item;
int ret;
DEBUGASSERT(driver != NULL && driver->probe != NULL &&
driver->remove != NULL);
ret = nxmutex_lock(&g_vhost_bus.lock);
if (ret < 0)
{
return ret;
}
/* Add the driver to the vhost_bus driver list */
list_add_tail(&g_vhost_bus.driver, &driver->node);
/* Match all the devices has registered in the vhost_bus */
list_for_every_entry(&g_vhost_bus.device, item, struct vhost_device_item_s,
node)
{
if (item->driver == NULL && driver->device == item->device->id.device)
{
/* If found the device in the device list, call driver probe,
* if probe success, assign item->driver to indicate the device
* matched.
*/
item->device->priv = driver;
if (driver->probe(item->device) >= 0)
{
item->driver = driver;
}
}
}
nxmutex_unlock(&g_vhost_bus.lock);
return ret;
}
/****************************************************************************
* Name: vhost_unregister_driver
****************************************************************************/
int vhost_unregister_driver(FAR struct vhost_driver *driver)
{
FAR struct vhost_device_item_s *item;
int ret;
DEBUGASSERT(driver != NULL);
ret = nxmutex_lock(&g_vhost_bus.lock);
if (ret < 0)
{
return ret;
}
/* Find all the devices matched with driver in device list */
list_for_every_entry(&g_vhost_bus.device, item, struct vhost_device_item_s,
node)
{
if (item->driver == driver)
{
/* 1. Call driver remove function;
* 2. Mark item->driver NULL to indicate the device unmatched;
*/
driver->remove(item->device);
item->driver = NULL;
}
}
/* Remove the driver from the driver list */
list_delete(&driver->node);
nxmutex_unlock(&g_vhost_bus.lock);
return ret;
}
/****************************************************************************
* Name: vhost_register_device
****************************************************************************/
int vhost_register_device(FAR struct vhost_device *device)
{
FAR struct vhost_device_item_s *item;
FAR struct vhost_driver *driver;
int ret;
item = kmm_zalloc(sizeof(*item));
if (item == NULL)
{
return -ENOMEM;
}
item->device = device;
ret = nxmutex_lock(&g_vhost_bus.lock);
if (ret < 0)
{
kmm_free(item);
return ret;
}
/* 1. Add device to defered device list if virtio driver not OK;
* 2. Add device to the normal device list and try to probe the driver
* if virtio driver has been OK.
*/
if (!vhost_status_driver_ok(device))
{
list_add_tail(&g_vhost_bus.defered_device, &item->node);
if (list_is_singular(&g_vhost_bus.defered_device))
{
work_queue(LPWORK, &g_vhost_bus.defered_work,
vhost_defered_probe_work, NULL,
VHOST_DEFERED_PROBE_PERIOD);
}
}
else
{
list_add_tail(&g_vhost_bus.device, &item->node);
/* Match the driver has registered in the vhost_bus */
list_for_every_entry(&g_vhost_bus.driver, driver, struct vhost_driver,
node)
{
if (driver->device == device->id.device)
{
/* If found the driver in the driver list, call driver probe,
* if probe success, assign item->driver to indicate the device
* matched.
*/
device->priv = driver;
if (driver->probe(device) >= 0)
{
item->driver = driver;
}
break;
}
}
}
nxmutex_unlock(&g_vhost_bus.lock);
return ret;
}
/****************************************************************************
* Name: vhost_unregister_device
****************************************************************************/
int vhost_unregister_device(FAR struct vhost_device *device)
{
FAR struct vhost_device_item_s *item;
int ret;
ret = nxmutex_lock(&g_vhost_bus.lock);
if (ret < 0)
{
return ret;
}
/* Find the device in device list */
list_for_every_entry(&g_vhost_bus.device, item,
struct vhost_device_item_s, node)
{
if (item->device == device)
{
/* Call driver remove */
if (item->driver)
{
item->driver->remove(item->device);
}
/* Remove the device from the device list and free memory */
list_delete(&item->node);
kmm_free(item);
goto out;
}
}
list_for_every_entry(&g_vhost_bus.defered_device, item,
struct vhost_device_item_s, node)
{
if (item->device == device)
{
list_delete(&item->node);
kmm_free(item);
goto out;
}
}
out:
nxmutex_unlock(&g_vhost_bus.lock);
return ret;
}
/****************************************************************************
* Name: vhost_register_drivers
****************************************************************************/
void vhost_register_drivers(void)
{
struct metal_init_params params = METAL_INIT_DEFAULTS;
int ret;
ret = metal_init(&params);
if (ret < 0)
{
vhosterr("metal_init failed, ret=%d\n", ret);
}
#ifdef CONFIG_DRIVERS_VHOST_RNG
ret = vhost_register_rng_driver();
if (ret < 0)
{
vhosterr("vhost_register_rng_driver failed, ret=%d\n", ret);
}
#endif
UNUSED(ret);
}
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