9da9560c4d
Use the existing legacy PCI driver as the basis for shared code between the legacy and modern PCI drivers. The existing virtio_pci kernel module will contain both the legacy and modern drivers. Changes to the virtqueue and each device driver (network, block, etc) for V1 support come in later commits. Update the MMIO driver to reflect the VirtIO bus method changes, but the modern compliance can be improved on later. Note that the modern PCI driver requires bus_map_resource() to be implemented, which is not the case on all archs. The hw.virtio.pci.transitional tunable default value is zero so transitional devices will continue to be driven via the legacy driver. Reviewed by: grehan (mentor) Differential Revision: https://reviews.freebsd.org/D27856
79 lines
3.3 KiB
C
79 lines
3.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright IBM Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_PCI_LEGACY_VAR_H
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#define _VIRTIO_PCI_LEGACY_VAR_H
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#include <dev/virtio/pci/virtio_pci_var.h>
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/* VirtIO ABI version, this must match exactly. */
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#define VIRTIO_PCI_ABI_VERSION 0
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/*
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* VirtIO Header, located in BAR 0.
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*/
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#define VIRTIO_PCI_HOST_FEATURES 0 /* host's supported features (32bit, RO)*/
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#define VIRTIO_PCI_GUEST_FEATURES 4 /* guest's supported features (32, RW) */
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#define VIRTIO_PCI_QUEUE_PFN 8 /* physical address of VQ (32, RW) */
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#define VIRTIO_PCI_QUEUE_NUM 12 /* number of ring entries (16, RO) */
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#define VIRTIO_PCI_QUEUE_SEL 14 /* current VQ selection (16, RW) */
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#define VIRTIO_PCI_QUEUE_NOTIFY 16 /* notify host regarding VQ (16, RW) */
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#define VIRTIO_PCI_STATUS 18 /* device status register (8, RW) */
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#define VIRTIO_PCI_ISR 19 /* interrupt status register, reading
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* also clears the register (8, RO) */
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/* Only if MSIX is enabled: */
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#define VIRTIO_MSI_CONFIG_VECTOR 20 /* configuration change vector (16, RW) */
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#define VIRTIO_MSI_QUEUE_VECTOR 22 /* vector for selected VQ notifications
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(16, RW) */
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/*
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* The remaining space is defined by each driver as the per-driver
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* configuration space.
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*/
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#define VIRTIO_PCI_CONFIG_OFF(msix_enabled) ((msix_enabled) ? 24 : 20)
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/*
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* How many bits to shift physical queue address written to QUEUE_PFN.
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* 12 is historical, and due to x86 page size.
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*/
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#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
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/* The alignment to use between consumer and producer parts of vring. */
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#define VIRTIO_PCI_VRING_ALIGN 4096
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#endif /* _VIRTIO_PCI_LEGACY_VAR_H */
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