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1862ee22ce
This patch add a support for second version of the virtio-mmio device, which follows OASIS "Virtual I/O Device (VIRTIO) Version 1.0" specification. Main changes: 1. The control register symbolic names use the new device/driver nomenclature rather than the old guest/host one. 2. The driver detect the device version (version 1 is the pre-OASIS spec, version 2 is compatible with fist revision of the OASIS spec) and drives the device accordingly. 3. New version uses direct addressing (64 bit address split into two low/high register) instead of the guest page size based one, and addresses each part of the queue (descriptors, available, used) separately. 4. The device activity is now explicitly triggered by writing to the "queue ready" register. 5. Whole 64 bit features are properly handled now (both ways). Signed-off-by: Pawel Moll <pawel.moll@arm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
141 lines
4.5 KiB
C
141 lines
4.5 KiB
C
/*
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* Virtio platform device driver
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*
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* Copyright 2011, ARM Ltd.
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*
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* Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007
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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 ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* 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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#ifndef _LINUX_VIRTIO_MMIO_H
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#define _LINUX_VIRTIO_MMIO_H
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/*
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* Control registers
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*/
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/* Magic value ("virt" string) - Read Only */
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#define VIRTIO_MMIO_MAGIC_VALUE 0x000
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/* Virtio device version - Read Only */
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#define VIRTIO_MMIO_VERSION 0x004
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/* Virtio device ID - Read Only */
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#define VIRTIO_MMIO_DEVICE_ID 0x008
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/* Virtio vendor ID - Read Only */
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#define VIRTIO_MMIO_VENDOR_ID 0x00c
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/* Bitmask of the features supported by the device (host)
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* (32 bits per set) - Read Only */
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#define VIRTIO_MMIO_DEVICE_FEATURES 0x010
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/* Device (host) features set selector - Write Only */
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#define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014
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/* Bitmask of features activated by the driver (guest)
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* (32 bits per set) - Write Only */
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#define VIRTIO_MMIO_DRIVER_FEATURES 0x020
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/* Activated features set selector - Write Only */
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#define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024
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#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
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/* Guest's memory page size in bytes - Write Only */
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#define VIRTIO_MMIO_GUEST_PAGE_SIZE 0x028
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#endif
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/* Queue selector - Write Only */
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#define VIRTIO_MMIO_QUEUE_SEL 0x030
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/* Maximum size of the currently selected queue - Read Only */
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#define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034
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/* Queue size for the currently selected queue - Write Only */
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#define VIRTIO_MMIO_QUEUE_NUM 0x038
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#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
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/* Used Ring alignment for the currently selected queue - Write Only */
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#define VIRTIO_MMIO_QUEUE_ALIGN 0x03c
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/* Guest's PFN for the currently selected queue - Read Write */
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#define VIRTIO_MMIO_QUEUE_PFN 0x040
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#endif
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/* Ready bit for the currently selected queue - Read Write */
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#define VIRTIO_MMIO_QUEUE_READY 0x044
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/* Queue notifier - Write Only */
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#define VIRTIO_MMIO_QUEUE_NOTIFY 0x050
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/* Interrupt status - Read Only */
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#define VIRTIO_MMIO_INTERRUPT_STATUS 0x060
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/* Interrupt acknowledge - Write Only */
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#define VIRTIO_MMIO_INTERRUPT_ACK 0x064
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/* Device status register - Read Write */
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#define VIRTIO_MMIO_STATUS 0x070
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/* Selected queue's Descriptor Table address, 64 bits in two halves */
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#define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080
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#define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084
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/* Selected queue's Available Ring address, 64 bits in two halves */
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#define VIRTIO_MMIO_QUEUE_AVAIL_LOW 0x090
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#define VIRTIO_MMIO_QUEUE_AVAIL_HIGH 0x094
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/* Selected queue's Used Ring address, 64 bits in two halves */
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#define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0
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#define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4
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/* Configuration atomicity value */
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#define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc
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/* The config space is defined by each driver as
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* the per-driver configuration space - Read Write */
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#define VIRTIO_MMIO_CONFIG 0x100
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/*
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* Interrupt flags (re: interrupt status & acknowledge registers)
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*/
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#define VIRTIO_MMIO_INT_VRING (1 << 0)
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#define VIRTIO_MMIO_INT_CONFIG (1 << 1)
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#endif
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