mirror of https://github.com/acidanthera/audk.git
317 lines
11 KiB
C
317 lines
11 KiB
C
/** @file
|
|
|
|
Declarations of utility functions used by virtio device drivers.
|
|
|
|
Copyright (C) 2012-2016, Red Hat, Inc.
|
|
Copyright (C) 2017, AMD Inc, All rights reserved.<BR>
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#ifndef _VIRTIO_LIB_H_
|
|
#define _VIRTIO_LIB_H_
|
|
|
|
#include <Protocol/VirtioDevice.h>
|
|
|
|
#include <IndustryStandard/Virtio.h>
|
|
|
|
|
|
/**
|
|
|
|
Configure a virtio ring.
|
|
|
|
This function sets up internal storage (the guest-host communication area)
|
|
and lays out several "navigation" (ie. no-ownership) pointers to parts of
|
|
that storage.
|
|
|
|
Relevant sections from the virtio-0.9.5 spec:
|
|
- 1.1 Virtqueues,
|
|
- 2.3 Virtqueue Configuration.
|
|
|
|
@param[in] VirtIo The virtio device which will use the ring.
|
|
|
|
@param[in] The number of descriptors to allocate for the
|
|
virtio ring, as requested by the host.
|
|
|
|
@param[out] Ring The virtio ring to set up.
|
|
|
|
@return Status codes propagated from
|
|
VirtIo->AllocateSharedPages().
|
|
|
|
@retval EFI_SUCCESS Allocation and setup successful. Ring->Base
|
|
(and nothing else) is responsible for
|
|
deallocation.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
VirtioRingInit (
|
|
IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
|
|
IN UINT16 QueueSize,
|
|
OUT VRING *Ring
|
|
);
|
|
|
|
|
|
/**
|
|
|
|
Map the ring buffer so that it can be accessed equally by both guest
|
|
and hypervisor.
|
|
|
|
@param[in] VirtIo The virtio device instance.
|
|
|
|
@param[in] Ring The virtio ring to map.
|
|
|
|
@param[out] RingBaseShift A resulting translation offset, to be
|
|
passed to VirtIo->SetQueueAddress().
|
|
|
|
@param[out] Mapping A resulting token to pass to
|
|
VirtIo->UnmapSharedBuffer().
|
|
|
|
@return Status code from VirtIo->MapSharedBuffer()
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
VirtioRingMap (
|
|
IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
|
|
IN VRING *Ring,
|
|
OUT UINT64 *RingBaseShift,
|
|
OUT VOID **Mapping
|
|
);
|
|
|
|
/**
|
|
|
|
Tear down the internal resources of a configured virtio ring.
|
|
|
|
The caller is responsible to stop the host from using this ring before
|
|
invoking this function: the VSTAT_DRIVER_OK bit must be clear in
|
|
VhdrDeviceStatus.
|
|
|
|
@param[in] VirtIo The virtio device which was using the ring.
|
|
|
|
@param[out] Ring The virtio ring to clean up.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
VirtioRingUninit (
|
|
IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
|
|
IN OUT VRING *Ring
|
|
);
|
|
|
|
|
|
//
|
|
// Internal use structure for tracking the submission of a multi-descriptor
|
|
// request.
|
|
//
|
|
typedef struct {
|
|
UINT16 HeadDescIdx;
|
|
UINT16 NextDescIdx;
|
|
} DESC_INDICES;
|
|
|
|
|
|
/**
|
|
|
|
Turn off interrupt notifications from the host, and prepare for appending
|
|
multiple descriptors to the virtio ring.
|
|
|
|
The calling driver must be in VSTAT_DRIVER_OK state.
|
|
|
|
@param[in,out] Ring The virtio ring we intend to append descriptors to.
|
|
|
|
@param[out] Indices The DESC_INDICES structure to initialize.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
VirtioPrepare (
|
|
IN OUT VRING *Ring,
|
|
OUT DESC_INDICES *Indices
|
|
);
|
|
|
|
|
|
/**
|
|
|
|
Append a contiguous buffer for transmission / reception via the virtio ring.
|
|
|
|
This function implements the following section from virtio-0.9.5:
|
|
- 2.4.1.1 Placing Buffers into the Descriptor Table
|
|
|
|
Free space is taken as granted, since the individual drivers support only
|
|
synchronous requests and host side status is processed in lock-step with
|
|
request submission. It is the calling driver's responsibility to verify the
|
|
ring size in advance.
|
|
|
|
The caller is responsible for initializing *Indices with VirtioPrepare()
|
|
first.
|
|
|
|
@param[in,out] Ring The virtio ring to append the buffer to,
|
|
as a descriptor.
|
|
|
|
@param[in] BufferDeviceAddress (Bus master device) start address of the
|
|
transmit / receive buffer.
|
|
|
|
@param[in] BufferSize Number of bytes to transmit or receive.
|
|
|
|
@param[in] Flags A bitmask of VRING_DESC_F_* flags. The
|
|
caller computes this mask dependent on
|
|
further buffers to append and transfer
|
|
direction. VRING_DESC_F_INDIRECT is
|
|
unsupported. The VRING_DESC.Next field is
|
|
always set, but the host only interprets
|
|
it dependent on VRING_DESC_F_NEXT.
|
|
|
|
@param[in,out] Indices Indices->HeadDescIdx is not accessed.
|
|
On input, Indices->NextDescIdx identifies
|
|
the next descriptor to carry the buffer.
|
|
On output, Indices->NextDescIdx is
|
|
incremented by one, modulo 2^16.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
VirtioAppendDesc (
|
|
IN OUT VRING *Ring,
|
|
IN UINT64 BufferDeviceAddress,
|
|
IN UINT32 BufferSize,
|
|
IN UINT16 Flags,
|
|
IN OUT DESC_INDICES *Indices
|
|
);
|
|
|
|
|
|
/**
|
|
|
|
Notify the host about the descriptor chain just built, and wait until the
|
|
host processes it.
|
|
|
|
@param[in] VirtIo The target virtio device to notify.
|
|
|
|
@param[in] VirtQueueId Identifies the queue for the target device.
|
|
|
|
@param[in,out] Ring The virtio ring with descriptors to submit.
|
|
|
|
@param[in] Indices Indices->NextDescIdx is not accessed.
|
|
Indices->HeadDescIdx identifies the head descriptor
|
|
of the descriptor chain.
|
|
|
|
@param[out] UsedLen On success, the total number of bytes, consecutively
|
|
across the buffers linked by the descriptor chain,
|
|
that the host wrote. May be NULL if the caller
|
|
doesn't care, or can compute the same information
|
|
from device-specific request structures linked by the
|
|
descriptor chain.
|
|
|
|
@return Error code from VirtIo->SetQueueNotify() if it fails.
|
|
|
|
@retval EFI_SUCCESS Otherwise, the host processed all descriptors.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
VirtioFlush (
|
|
IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
|
|
IN UINT16 VirtQueueId,
|
|
IN OUT VRING *Ring,
|
|
IN DESC_INDICES *Indices,
|
|
OUT UINT32 *UsedLen OPTIONAL
|
|
);
|
|
|
|
|
|
/**
|
|
|
|
Report the feature bits to the VirtIo 1.0 device that the VirtIo 1.0 driver
|
|
understands.
|
|
|
|
In VirtIo 1.0, a device can reject a self-inconsistent feature bitmap through
|
|
the new VSTAT_FEATURES_OK status bit. (For example if the driver requests a
|
|
higher level feature but clears a prerequisite feature.) This function is a
|
|
small wrapper around VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures() that also
|
|
verifies if the VirtIo 1.0 device accepts the feature bitmap.
|
|
|
|
@param[in] VirtIo Report feature bits to this device.
|
|
|
|
@param[in] Features The set of feature bits that the driver wishes
|
|
to report. The caller is responsible to perform
|
|
any masking before calling this function; the
|
|
value is directly written with
|
|
VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures().
|
|
|
|
@param[in,out] DeviceStatus On input, the status byte most recently written
|
|
to the device's status register. On output (even
|
|
on error), DeviceStatus will be updated so that
|
|
it is suitable for further status bit
|
|
manipulation and writing to the device's status
|
|
register.
|
|
|
|
@retval EFI_SUCCESS The device accepted the configuration in Features.
|
|
|
|
@return EFI_UNSUPPORTED The device rejected the configuration in Features.
|
|
|
|
@retval EFI_UNSUPPORTED VirtIo->Revision is smaller than 1.0.0.
|
|
|
|
@return Error codes from the SetGuestFeatures(),
|
|
SetDeviceStatus(), GetDeviceStatus() member
|
|
functions.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
Virtio10WriteFeatures (
|
|
IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
|
|
IN UINT64 Features,
|
|
IN OUT UINT8 *DeviceStatus
|
|
);
|
|
|
|
/**
|
|
Provides the virtio device address required to access system memory from a
|
|
DMA bus master.
|
|
|
|
The interface follows the same usage pattern as defined in UEFI spec 2.6
|
|
(Section 13.2 PCI Root Bridge I/O Protocol)
|
|
|
|
The VirtioMapAllBytesInSharedBuffer() is similar to VIRTIO_MAP_SHARED
|
|
with exception that NumberOfBytes is IN-only parameter. The function
|
|
maps all the bytes specified in NumberOfBytes param in one consecutive
|
|
range.
|
|
|
|
@param[in] VirtIo The virtio device for which the mapping is
|
|
requested.
|
|
|
|
@param[in] Operation Indicates if the bus master is going to
|
|
read or write to system memory.
|
|
|
|
@param[in] HostAddress The system memory address to map to shared
|
|
buffer address.
|
|
|
|
@param[in] NumberOfBytes Number of bytes to map.
|
|
|
|
@param[out] DeviceAddress The resulting shared map address for the
|
|
bus master to access the hosts HostAddress.
|
|
|
|
@param[out] Mapping A resulting token to pass to
|
|
VIRTIO_UNMAP_SHARED.
|
|
|
|
|
|
@retval EFI_SUCCESS The NumberOfBytes is succesfully mapped.
|
|
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a
|
|
common buffer.
|
|
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
|
|
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to
|
|
a lack of resources. This includes the case
|
|
when NumberOfBytes bytes cannot be mapped
|
|
in one consecutive range.
|
|
@retval EFI_DEVICE_ERROR The system hardware could not map the
|
|
requested address.
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
VirtioMapAllBytesInSharedBuffer (
|
|
IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
|
|
IN VIRTIO_MAP_OPERATION Operation,
|
|
IN VOID *HostAddress,
|
|
IN UINTN NumberOfBytes,
|
|
OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
|
|
OUT VOID **Mapping
|
|
);
|
|
#endif // _VIRTIO_LIB_H_
|