b0d70b76cb
1. Some platforms do not support interrupt mode (PCI_MSI/MSIX), so add polling mode support, so these platforms can also use virtio-pci; 2. In some cases, we do not want to use the interrupt for virtio driver to avoid time jitter, so add the polling mode support; 3. If CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0, interrupt mode. if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD > 0, polling mode. Signed-off-by: wangyongrong <wangyongrong@xiaomi.com>
132 lines
4.6 KiB
C
132 lines
4.6 KiB
C
/****************************************************************************
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* drivers/virtio/virtio-pci.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __DRIVERS_VIRTIO_VIRTIO_PCI_H
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#define __DRIVERS_VIRTIO_VIRTIO_PCI_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_DRIVERS_VIRTIO_PCI
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#include <nuttx/pci/pci.h>
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#include <nuttx/virtio/virtio.h>
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#include <nuttx/wdog.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define VIRTIO_PCI_VRING_ALIGN (1 << 12)
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#define VIRTIO_PCI_MSI_NO_VECTOR 0xffff
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#define VIRTIO_PCI_INT_CFG 0
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#define VIRTIO_PCI_INT_VQ 1
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#define VIRTIO_PCI_INT_NUM 2
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct virtio_pci_device_s;
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struct virtio_pci_ops_s
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{
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CODE uint16_t (*get_queue_len)(FAR struct virtio_pci_device_s *vpdev,
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int idx);
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CODE int (*config_vector)(FAR struct virtio_pci_device_s *vpdev,
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bool enable);
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CODE int (*create_virtqueue)(FAR struct virtio_pci_device_s *vpdev,
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FAR struct virtqueue *vq);
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CODE void (*delete_virtqueue)(FAR struct virtio_device *vdev, int index);
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};
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struct virtio_pci_device_s
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{
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struct virtio_device vdev; /* Virtio deivce */
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FAR struct pci_device_s *dev; /* PCI device */
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FAR const struct virtio_pci_ops_s *ops;
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metal_phys_addr_t shm_phy;
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struct metal_io_region shm_io; /* Share memory io region,
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* virtqueue use this io.
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*/
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#if CONFIG_DRIVERS_VIRTIO_PCI_POLLING_PERIOD <= 0
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int irq[VIRTIO_PCI_INT_NUM];
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#else
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struct wdog_s wdog;
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#endif
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/* for modern */
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FAR void *common;
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size_t common_len;
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FAR void *notify;
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size_t notify_len;
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uint32_t notify_off_multiplier;
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FAR void *device;
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size_t device_len;
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/* for legacy */
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FAR void *ioaddr;
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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void virtio_pci_reset_device(FAR struct virtio_device *vdev);
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uint32_t
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virtio_pci_negotiate_features(FAR struct virtio_device *vdev,
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uint32_t features);
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int virtio_pci_create_virtqueues(FAR struct virtio_device *vdev,
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unsigned int flags,
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unsigned int nvqs,
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FAR const char *names[],
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vq_callback callbacks[]);
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void virtio_pci_delete_virtqueues(FAR struct virtio_device *vdev);
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int virtio_pci_modern_probe(FAR struct pci_device_s *dev);
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int virtio_pci_legacy_probe(FAR struct pci_device_s *dev);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_DRIVERS_VIRTIO_PCI */
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#endif /* __DRIVERS_VIRTIO_VIRTIO_PCI_H */
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