forked from mirror/qemu
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
211 lines
7.4 KiB
C
211 lines
7.4 KiB
C
/*
|
|
* Virtio PCI driver
|
|
*
|
|
* This module allows virtio devices to be used over a virtual PCI device.
|
|
* This can be used with QEMU based VMMs like KVM or Xen.
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This header is BSD licensed so anyone can use the definitions to implement
|
|
* compatible drivers/servers.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of IBM nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _LINUX_VIRTIO_PCI_H
|
|
#define _LINUX_VIRTIO_PCI_H
|
|
|
|
#include "standard-headers/linux/types.h"
|
|
|
|
#ifndef VIRTIO_PCI_NO_LEGACY
|
|
|
|
/* A 32-bit r/o bitmask of the features supported by the host */
|
|
#define VIRTIO_PCI_HOST_FEATURES 0
|
|
|
|
/* A 32-bit r/w bitmask of features activated by the guest */
|
|
#define VIRTIO_PCI_GUEST_FEATURES 4
|
|
|
|
/* A 32-bit r/w PFN for the currently selected queue */
|
|
#define VIRTIO_PCI_QUEUE_PFN 8
|
|
|
|
/* A 16-bit r/o queue size for the currently selected queue */
|
|
#define VIRTIO_PCI_QUEUE_NUM 12
|
|
|
|
/* A 16-bit r/w queue selector */
|
|
#define VIRTIO_PCI_QUEUE_SEL 14
|
|
|
|
/* A 16-bit r/w queue notifier */
|
|
#define VIRTIO_PCI_QUEUE_NOTIFY 16
|
|
|
|
/* An 8-bit device status register. */
|
|
#define VIRTIO_PCI_STATUS 18
|
|
|
|
/* An 8-bit r/o interrupt status register. Reading the value will return the
|
|
* current contents of the ISR and will also clear it. This is effectively
|
|
* a read-and-acknowledge. */
|
|
#define VIRTIO_PCI_ISR 19
|
|
|
|
/* MSI-X registers: only enabled if MSI-X is enabled. */
|
|
/* A 16-bit vector for configuration changes. */
|
|
#define VIRTIO_MSI_CONFIG_VECTOR 20
|
|
/* A 16-bit vector for selected queue notifications. */
|
|
#define VIRTIO_MSI_QUEUE_VECTOR 22
|
|
|
|
/* The remaining space is defined by each driver as the per-driver
|
|
* configuration space */
|
|
#define VIRTIO_PCI_CONFIG_OFF(msix_enabled) ((msix_enabled) ? 24 : 20)
|
|
/* Deprecated: please use VIRTIO_PCI_CONFIG_OFF instead */
|
|
#define VIRTIO_PCI_CONFIG(dev) VIRTIO_PCI_CONFIG_OFF((dev)->msix_enabled)
|
|
|
|
/* Virtio ABI version, this must match exactly */
|
|
#define VIRTIO_PCI_ABI_VERSION 0
|
|
|
|
/* How many bits to shift physical queue address written to QUEUE_PFN.
|
|
* 12 is historical, and due to x86 page size. */
|
|
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
|
|
|
|
/* The alignment to use between consumer and producer parts of vring.
|
|
* x86 pagesize again. */
|
|
#define VIRTIO_PCI_VRING_ALIGN 4096
|
|
|
|
#endif /* VIRTIO_PCI_NO_LEGACY */
|
|
|
|
/* The bit of the ISR which indicates a device configuration change. */
|
|
#define VIRTIO_PCI_ISR_CONFIG 0x2
|
|
/* Vector value used to disable MSI for queue */
|
|
#define VIRTIO_MSI_NO_VECTOR 0xffff
|
|
|
|
#ifndef VIRTIO_PCI_NO_MODERN
|
|
|
|
/* IDs for different capabilities. Must all exist. */
|
|
|
|
/* Common configuration */
|
|
#define VIRTIO_PCI_CAP_COMMON_CFG 1
|
|
/* Notifications */
|
|
#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
|
|
/* ISR access */
|
|
#define VIRTIO_PCI_CAP_ISR_CFG 3
|
|
/* Device specific configuration */
|
|
#define VIRTIO_PCI_CAP_DEVICE_CFG 4
|
|
/* PCI configuration access */
|
|
#define VIRTIO_PCI_CAP_PCI_CFG 5
|
|
/* Additional shared memory capability */
|
|
#define VIRTIO_PCI_CAP_SHARED_MEMORY_CFG 8
|
|
|
|
/* This is the PCI capability header: */
|
|
struct virtio_pci_cap {
|
|
uint8_t cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
|
|
uint8_t cap_next; /* Generic PCI field: next ptr. */
|
|
uint8_t cap_len; /* Generic PCI field: capability length */
|
|
uint8_t cfg_type; /* Identifies the structure. */
|
|
uint8_t bar; /* Where to find it. */
|
|
uint8_t id; /* Multiple capabilities of the same type */
|
|
uint8_t padding[2]; /* Pad to full dword. */
|
|
uint32_t offset; /* Offset within bar. */
|
|
uint32_t length; /* Length of the structure, in bytes. */
|
|
};
|
|
|
|
struct virtio_pci_cap64 {
|
|
struct virtio_pci_cap cap;
|
|
uint32_t offset_hi; /* Most sig 32 bits of offset */
|
|
uint32_t length_hi; /* Most sig 32 bits of length */
|
|
};
|
|
|
|
struct virtio_pci_notify_cap {
|
|
struct virtio_pci_cap cap;
|
|
uint32_t notify_off_multiplier; /* Multiplier for queue_notify_off. */
|
|
};
|
|
|
|
/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
|
|
struct virtio_pci_common_cfg {
|
|
/* About the whole device. */
|
|
uint32_t device_feature_select; /* read-write */
|
|
uint32_t device_feature; /* read-only */
|
|
uint32_t guest_feature_select; /* read-write */
|
|
uint32_t guest_feature; /* read-write */
|
|
uint16_t msix_config; /* read-write */
|
|
uint16_t num_queues; /* read-only */
|
|
uint8_t device_status; /* read-write */
|
|
uint8_t config_generation; /* read-only */
|
|
|
|
/* About a specific virtqueue. */
|
|
uint16_t queue_select; /* read-write */
|
|
uint16_t queue_size; /* read-write, power of 2. */
|
|
uint16_t queue_msix_vector; /* read-write */
|
|
uint16_t queue_enable; /* read-write */
|
|
uint16_t queue_notify_off; /* read-only */
|
|
uint32_t queue_desc_lo; /* read-write */
|
|
uint32_t queue_desc_hi; /* read-write */
|
|
uint32_t queue_avail_lo; /* read-write */
|
|
uint32_t queue_avail_hi; /* read-write */
|
|
uint32_t queue_used_lo; /* read-write */
|
|
uint32_t queue_used_hi; /* read-write */
|
|
};
|
|
|
|
/* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
|
|
struct virtio_pci_cfg_cap {
|
|
struct virtio_pci_cap cap;
|
|
uint8_t pci_cfg_data[4]; /* Data for BAR access. */
|
|
};
|
|
|
|
/* Macro versions of offsets for the Old Timers! */
|
|
#define VIRTIO_PCI_CAP_VNDR 0
|
|
#define VIRTIO_PCI_CAP_NEXT 1
|
|
#define VIRTIO_PCI_CAP_LEN 2
|
|
#define VIRTIO_PCI_CAP_CFG_TYPE 3
|
|
#define VIRTIO_PCI_CAP_BAR 4
|
|
#define VIRTIO_PCI_CAP_OFFSET 8
|
|
#define VIRTIO_PCI_CAP_LENGTH 12
|
|
|
|
#define VIRTIO_PCI_NOTIFY_CAP_MULT 16
|
|
|
|
#define VIRTIO_PCI_COMMON_DFSELECT 0
|
|
#define VIRTIO_PCI_COMMON_DF 4
|
|
#define VIRTIO_PCI_COMMON_GFSELECT 8
|
|
#define VIRTIO_PCI_COMMON_GF 12
|
|
#define VIRTIO_PCI_COMMON_MSIX 16
|
|
#define VIRTIO_PCI_COMMON_NUMQ 18
|
|
#define VIRTIO_PCI_COMMON_STATUS 20
|
|
#define VIRTIO_PCI_COMMON_CFGGENERATION 21
|
|
#define VIRTIO_PCI_COMMON_Q_SELECT 22
|
|
#define VIRTIO_PCI_COMMON_Q_SIZE 24
|
|
#define VIRTIO_PCI_COMMON_Q_MSIX 26
|
|
#define VIRTIO_PCI_COMMON_Q_ENABLE 28
|
|
#define VIRTIO_PCI_COMMON_Q_NOFF 30
|
|
#define VIRTIO_PCI_COMMON_Q_DESCLO 32
|
|
#define VIRTIO_PCI_COMMON_Q_DESCHI 36
|
|
#define VIRTIO_PCI_COMMON_Q_AVAILLO 40
|
|
#define VIRTIO_PCI_COMMON_Q_AVAILHI 44
|
|
#define VIRTIO_PCI_COMMON_Q_USEDLO 48
|
|
#define VIRTIO_PCI_COMMON_Q_USEDHI 52
|
|
#define VIRTIO_PCI_COMMON_Q_NDATA 56
|
|
#define VIRTIO_PCI_COMMON_Q_RESET 58
|
|
|
|
#endif /* VIRTIO_PCI_NO_MODERN */
|
|
|
|
#endif
|