310dacd09b
PCI:
- Properly handle interrupt fallback from MSIX to MSI to legacy.
The host may not have sufficient resources to support MSIX,
so we must be able to fallback to legacy interrupts.
- Add interface to get the (sub) vendor and device IDs.
- Rename flags to VTPCI_FLAG_* like other VirtIO drivers.
Block:
- No longer allocate vtblk_requests from separate UMA zone.
malloc(9) from M_DEVBUF is sufficient. Assert segment counts
at allocation.
- More verbose error and debug messages.
Network:
- Remove stray write once variable.
Virtqueue:
- Shuffle code around in preparation of converting the mb()s to
the appropriate atomic(9) operations.
- Only walk the descriptor chain when freeing if INVARIANTS is
defined since the result is only KASSERT()ed.
Submitted by: Bryan Venteicher (bryanv@daemoninthecloset.org)
88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
/*-
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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_H
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#define _VIRTIO_PCI_H
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/* VirtIO PCI vendor/device ID. */
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#define VIRTIO_PCI_VENDORID 0x1AF4
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#define VIRTIO_PCI_DEVICEID_MIN 0x1000
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#define VIRTIO_PCI_DEVICEID_MAX 0x103F
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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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/* The bit of the ISR which indicates a device has an interrupt. */
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#define VIRTIO_PCI_ISR_INTR 0x1
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/* The bit of the ISR which indicates a device configuration change. */
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#define VIRTIO_PCI_ISR_CONFIG 0x2
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/* Vector value used to disable MSI for queue. */
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#define VIRTIO_MSI_NO_VECTOR 0xFFFF
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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(sc) \
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(((sc)->vtpci_flags & VTPCI_FLAG_MSIX) ? 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_H */
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