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/*
* Copyright (c) 2014 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders 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 THE COPYRIGHT
* OWNER 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.
*
* Authors: Andreas Sandberg
*/
#include "debug/VIOBlock.hh"
#include "dev/virtio/block.hh"
#include "params/VirtIOBlock.hh"
#include "sim/system.hh"
VirtIOBlock::VirtIOBlock(Params *params)
: VirtIODeviceBase(params, ID_BLOCK, sizeof(Config), 0),
qRequests(params->system->physProxy, params->queueSize, *this),
image(*params->image)
{
registerQueue(qRequests);
config.capacity = image.size();
}
VirtIOBlock::~VirtIOBlock()
{
}
void
VirtIOBlock::readConfig(PacketPtr pkt, Addr cfgOffset)
{
Config cfg_out;
cfg_out.capacity = htov_legacy(config.capacity);
readConfigBlob(pkt, cfgOffset, (uint8_t *)&cfg_out);
}
VirtIOBlock::Status
VirtIOBlock::read(const BlkRequest &req, VirtDescriptor *desc_chain,
size_t off_data, size_t size)
{
uint8_t data[size];
uint64_t sector(req.sector);
DPRINTF(VIOBlock, "Read request starting @ sector %i (size: %i)\n",
sector, size);
if (size % SectorSize != 0)
panic("Unexpected request/sector size relationship\n");
for (Addr offset = 0; offset < size; offset += SectorSize) {
if (image.read(data + offset, sector) != SectorSize) {
warn("Failed to read sector %i\n", sector);
return S_IOERR;
}
++sector;
}
desc_chain->chainWrite(off_data, data, size);
return S_OK;
}
VirtIOBlock::Status
VirtIOBlock::write(const BlkRequest &req, VirtDescriptor *desc_chain,
size_t off_data, size_t size)
{
uint8_t data[size];
uint64_t sector(req.sector);
DPRINTF(VIOBlock, "Write request starting @ sector %i (size: %i)\n",
sector, size);
if (size % SectorSize != 0)
panic("Unexpected request/sector size relationship\n");
desc_chain->chainRead(off_data, data, size);
for (Addr offset = 0; offset < size; offset += SectorSize) {
if (image.write(data + offset, sector) != SectorSize) {
warn("Failed to write sector %i\n", sector);
return S_IOERR;
}
++sector;
}
return S_OK;
}
void
VirtIOBlock::RequestQueue::onNotifyDescriptor(VirtDescriptor *desc)
{
DPRINTF(VIOBlock, "Got input data descriptor (len: %i)\n",
desc->size());
/*
* Read the request structure and do endian conversion if
* necessary.
*/
BlkRequest req;
desc->chainRead(0, (uint8_t *)&req, sizeof(req));
req.type = htov_legacy(req.type);
req.sector = htov_legacy(req.sector);
Status status;
const size_t data_size(desc->chainSize()
- sizeof(BlkRequest) - sizeof(Status));
switch (req.type) {
case T_IN:
status = parent.read(req, desc, sizeof(BlkRequest), data_size);
break;
case T_OUT:
status = parent.write(req, desc, sizeof(BlkRequest), data_size);
break;
case T_FLUSH:
status = S_OK;
break;
default:
warn("Unsupported IO request: %i\n", req.type);
status = S_UNSUPP;
break;
}
desc->chainWrite(sizeof(BlkRequest) + data_size,
&status, sizeof(status));
// Tell the guest that we are done with this descriptor.
produceDescriptor(desc, sizeof(BlkRequest) + data_size + sizeof(Status));
parent.kick();
}
VirtIOBlock *
VirtIOBlockParams::create()
{
return new VirtIOBlock(this);
}
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