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incubator-nuttx/drivers/virtio/virtio-pci.c

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/****************************************************************************
* drivers/virtio/virtio-pci.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 <nuttx/config.h>
#include <debug.h>
#include <errno.h>
#include <stdint.h>
#include <sys/param.h>
#include <nuttx/clock.h>
#include <nuttx/virtio/virtio-pci.h>
#include "virtio-pci.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define VIRTIO_PCI_WORK_DELAY \
USEC2TICK(CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD)
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int virtio_pci_probe(FAR struct pci_device_s *dev);
static void virtio_pci_remove(FAR struct pci_device_s *dev);
static int virtio_pci_create_virtqueue(FAR struct virtio_pci_device_s *vpdev,
unsigned int i, FAR const char *name,
vq_callback callback);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct pci_device_id_s g_virtio_pci_id_table[] =
{
{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) },
{ 0, }
};
static struct pci_driver_s g_virtio_pci_drv =
{
g_virtio_pci_id_table,
virtio_pci_probe,
virtio_pci_remove
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: virtio_pci_vq_callback
****************************************************************************/
static void virtio_pci_vq_callback(FAR struct virtio_pci_device_s *vpdev)
{
FAR struct virtio_vring_info *vrings_info = vpdev->vdev.vrings_info;
FAR struct virtqueue *vq;
unsigned int i;
for (i = 0; i < vpdev->vdev.vrings_num; i++)
{
vq = vrings_info[i].vq;
if (vq->vq_used_cons_idx != vq->vq_ring.used->idx &&
vq->callback != NULL)
{
vq->callback(vq);
}
}
}
#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
/****************************************************************************
* Name: virtio_pci_interrupt
****************************************************************************/
static int virtio_pci_interrupt(int irq, FAR void *context, FAR void *arg)
{
FAR struct virtio_pci_device_s *vpdev = arg;
virtio_pci_vq_callback(vpdev);
return OK;
}
/****************************************************************************
* Name: virtio_pci_config_changed
****************************************************************************/
static int virtio_pci_config_changed(int irq, FAR void *context,
FAR void *arg)
{
/* TODO: not support config changed notification */
return OK;
}
#else
/****************************************************************************
* Name: virtio_pci_wdog
****************************************************************************/
static void virtio_pci_wdog(wdparm_t arg)
{
FAR struct virtio_pci_device_s *vpdev =
(FAR struct virtio_pci_device_s *)arg;
virtio_pci_vq_callback(vpdev);
wd_start(&vpdev->wdog, VIRTIO_PCI_WORK_DELAY, virtio_pci_wdog,
(wdparm_t)vpdev);
}
#endif
/****************************************************************************
* Name: virtio_pci_probe
****************************************************************************/
static int virtio_pci_probe(FAR struct pci_device_s *dev)
{
FAR struct virtio_pci_device_s *vpdev;
FAR struct virtio_device *vdev;
int ret;
/* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
if (dev->device < 0x1000 || dev->device > 0x107f)
{
pcierr("Pci device id err, id=%d\n", dev->device);
return -ENODEV;
}
vpdev = kmm_zalloc(sizeof(*vpdev));
if (vpdev == NULL)
{
vrterr("No enough memory\n");
return -ENOMEM;
}
dev->priv = vpdev;
vpdev->dev = dev;
vdev = &vpdev->vdev;
/* Virtio device initialize */
metal_io_init(&vpdev->shm_io, NULL, &vpdev->shm_phy,
SIZE_MAX, UINT_MAX, 0, metal_io_get_ops());
ret = pci_enable_device(dev);
if (ret < 0)
{
vrterr("Enable virtio pci device failed, ret=%d\n", ret);
goto err;
}
pci_set_master(dev);
ret = virtio_pci_modern_probe(dev);
if (ret == -ENODEV)
{
ret = virtio_pci_legacy_probe(dev);
if (ret < 0)
{
vrterr("Virtio pci legacy probe failed\n");
goto err_with_enable;
}
}
#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
/* Irq init */
ret = pci_alloc_irq(vpdev->dev, vpdev->irq, VIRTIO_PCI_INT_NUM);
if (ret != VIRTIO_PCI_INT_NUM)
{
vrterr("Failed to allocate MSI, ret=%d\n", ret);
goto err_with_enable;
}
vrtinfo("Interrupt mode: attaching MSI %d to %p, %d to %p\n",
vpdev->irq[VIRTIO_PCI_INT_CFG], virtio_pci_config_changed,
vpdev->irq[VIRTIO_PCI_INT_VQ], virtio_pci_interrupt);
ret = pci_connect_irq(vpdev->dev, vpdev->irq, VIRTIO_PCI_INT_NUM);
if (ret < 0)
{
vrterr("Failed to connect MSI %d\n", ret);
goto err_with_irq;
}
irq_attach(vpdev->irq[VIRTIO_PCI_INT_CFG],
virtio_pci_config_changed, vpdev);
irq_attach(vpdev->irq[VIRTIO_PCI_INT_VQ], virtio_pci_interrupt, vpdev);
#else
vrtinfo("Polling mode\n");
#endif
virtio_set_status(vdev, VIRTIO_CONFIG_STATUS_RESET);
virtio_set_status(vdev, VIRTIO_CONFIG_STATUS_ACK);
ret = virtio_register_device(&vpdev->vdev);
if (ret < 0)
{
vrterr("Register virtio device failed, ret=%d\n", ret);
goto err_with_attach;
}
return ret;
err_with_attach:
#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
irq_detach(vpdev->irq[VIRTIO_PCI_INT_CFG]);
irq_detach(vpdev->irq[VIRTIO_PCI_INT_VQ]);
err_with_irq:
pci_release_irq(vpdev->dev, vpdev->irq, VIRTIO_PCI_INT_NUM);
#endif
err_with_enable:
pci_clear_master(dev);
pci_disable_device(dev);
err:
kmm_free(vpdev);
return ret;
}
/****************************************************************************
* Name: virtio_pci_remove
****************************************************************************/
static void virtio_pci_remove(FAR struct pci_device_s *dev)
{
FAR struct virtio_pci_device_s *vpdev = dev->priv;
virtio_unregister_device(&vpdev->vdev);
#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
irq_detach(vpdev->irq[VIRTIO_PCI_INT_CFG]);
irq_detach(vpdev->irq[VIRTIO_PCI_INT_VQ]);
pci_release_irq(vpdev->dev, vpdev->irq, VIRTIO_PCI_INT_NUM);
#endif
pci_clear_master(dev);
pci_disable_device(dev);
kmm_free(vpdev);
}
/****************************************************************************
* Name: virtio_pci_create_virtqueue
****************************************************************************/
static int
virtio_pci_create_virtqueue(FAR struct virtio_pci_device_s *vpdev,
unsigned int i, FAR const char *name,
vq_callback callback)
{
FAR struct virtio_device *vdev = &vpdev->vdev;
FAR struct virtio_vring_info *vrinfo;
FAR struct vring_alloc_info *vralloc;
FAR struct virtqueue *vq;
int vringsize;
int ret;
/* Alloc virtqueue and init the vring info and vring alloc info */
vrinfo = &vdev->vrings_info[i];
vralloc = &vrinfo->info;
vralloc->num_descs = vpdev->ops->get_queue_len(vpdev, i);
vq = virtqueue_allocate(vralloc->num_descs);
if (vq == NULL)
{
vrterr("Virtqueue_allocate failed\n");
return -ENOMEM;
}
/* Init the vring info and vring alloc info */
vrinfo->vq = vq;
vrinfo->io = &vpdev->shm_io;
vralloc->align = VIRTIO_PCI_VRING_ALIGN;
vringsize = vring_size(vralloc->num_descs, VIRTIO_PCI_VRING_ALIGN);
vralloc->vaddr = virtio_zalloc_buf(vdev, vringsize,
VIRTIO_PCI_VRING_ALIGN);
if (vralloc->vaddr == NULL)
{
vrterr("Vring alloc failed\n");
return -ENOMEM;
}
/* Initialize the virtio queue */
ret = virtqueue_create(vdev, i, name, vralloc, callback,
vdev->func->notify, vq);
if (ret < 0)
{
vrterr("Virtqueue create error, ret=%d\n", ret);
return ret;
}
virtqueue_set_shmem_io(vq, &vpdev->shm_io);
/* Set the pci virtqueue register, active vq, enable vq */
ret = vpdev->ops->create_virtqueue(vpdev, vq);
if (ret < 0)
{
vrterr("Virtio_pci_config_virtqueue failed, ret=%d\n", ret);
return ret;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: virtio_pci_create_virtqueues
****************************************************************************/
int virtio_pci_create_virtqueues(FAR struct virtio_device *vdev,
unsigned int flags,
unsigned int nvqs,
FAR const char *names[],
vq_callback callbacks[])
{
FAR struct virtio_pci_device_s *vpdev =
(FAR struct virtio_pci_device_s *)vdev;
unsigned int i;
int ret = OK;
/* Alloc vring info */
vdev->vrings_num = nvqs;
vdev->vrings_info = kmm_zalloc(sizeof(struct virtio_vring_info) * nvqs);
if (vdev->vrings_info == NULL)
{
vrterr("Alloc vrings info failed\n");
return -ENOMEM;
}
/* Alloc and init the virtqueue */
for (i = 0; i < nvqs; i++)
{
ret = virtio_pci_create_virtqueue(vpdev, i, names[i], callbacks[i]);
if (ret < 0)
{
goto err;
}
}
#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
ret = vpdev->ops->config_vector(vpdev, true);
if (ret < 0)
{
vrterr("Config vector failed, vector=%u\n", ret);
goto err;
}
up_enable_irq(vpdev->irq[VIRTIO_PCI_INT_CFG]);
up_enable_irq(vpdev->irq[VIRTIO_PCI_INT_VQ]);
#else
ret = wd_start(&vpdev->wdog, VIRTIO_PCI_WORK_DELAY, virtio_pci_wdog,
(wdparm_t)vpdev);
if (ret < 0)
{
pcierr("Wd_start failed: %d\n", ret);
goto err;
}
#endif
return ret;
err:
virtio_pci_delete_virtqueues(vdev);
return ret;
}
/****************************************************************************
* Name: virtio_pci_delete_virtqueues
****************************************************************************/
void virtio_pci_delete_virtqueues(FAR struct virtio_device *vdev)
{
FAR struct virtio_pci_device_s *vpdev =
(FAR struct virtio_pci_device_s *)vdev;
FAR struct virtio_vring_info *vrinfo;
unsigned int i;
#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
up_disable_irq(vpdev->irq[VIRTIO_PCI_INT_CFG]);
up_disable_irq(vpdev->irq[VIRTIO_PCI_INT_VQ]);
vpdev->ops->config_vector(vpdev, false);
#else
wd_cancel(&vpdev->wdog);
#endif
/* Free the memory */
if (vdev->vrings_info != NULL)
{
for (i = 0; i < vdev->vrings_num; i++)
{
vrinfo = &vdev->vrings_info[i];
vpdev->ops->delete_virtqueue(vdev, i);
/* Free the vring buffer and virtqueue */
if (vrinfo->info.vaddr != NULL)
{
virtio_free_buf(vdev, vrinfo->info.vaddr);
}
if (vrinfo->vq != NULL)
{
virtqueue_free(vrinfo->vq);
}
}
kmm_free(vdev->vrings_info);
}
}
/****************************************************************************
* Name: virtio_pci_negotiate_features
****************************************************************************/
uint32_t
virtio_pci_negotiate_features(FAR struct virtio_device *vdev,
uint32_t features)
{
features = features & vdev->func->get_features(vdev);
vdev->func->set_features(vdev, features);
return features;
}
/****************************************************************************
* Name: virtio_pci_reset_device
****************************************************************************/
void virtio_pci_reset_device(FAR struct virtio_device *vdev)
{
vdev->func->set_features(vdev, VIRTIO_CONFIG_STATUS_RESET);
}
/****************************************************************************
* Name: register_virtio_pci_driver
****************************************************************************/
int register_virtio_pci_driver(void)
{
return pci_register_driver(&g_virtio_pci_drv);
}
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