bin/guest/vmm/controller/virtio_block.h

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GARNET_BIN_GUEST_VMM_CONTROLLER_VIRTIO_BLOCK_H_
#define GARNET_BIN_GUEST_VMM_CONTROLLER_VIRTIO_BLOCK_H_

#include <fuchsia/guest/device/cpp/fidl.h>
#include <fuchsia/sys/cpp/fidl.h>
#include <virtio/block.h>
#include <virtio/virtio_ids.h>

#include "garnet/bin/guest/vmm/virtio_device.h"

static constexpr uint16_t kVirtioBlockNumQueues = 1;

class VirtioBlock
    : public VirtioComponentDevice<VIRTIO_ID_BLOCK, kVirtioBlockNumQueues,
                                   virtio_blk_config_t> {
 public:
  VirtioBlock(fuchsia::guest::BlockMode mode, const PhysMem& phys_mem);

  zx_status_t Start(const zx::guest& guest, const std::string& id,
                    fuchsia::guest::BlockFormat format,
                    fuchsia::io::FilePtr file, fuchsia::sys::Launcher* launcher,
                    async_dispatcher_t* dispatcher);

 private:
  fuchsia::guest::BlockMode mode_;
  fuchsia::sys::ComponentControllerPtr controller_;
  // Use a sync pointer for consistency of virtual machine execution.
  fuchsia::guest::device::VirtioBlockSyncPtr block_;

  zx_status_t ConfigureQueue(uint16_t queue, uint16_t size, zx_gpaddr_t desc,
                             zx_gpaddr_t avail, zx_gpaddr_t used);
  zx_status_t Ready(uint32_t negotiated_features);
};

#endif  // GARNET_BIN_GUEST_VMM_CONTROLLER_VIRTIO_BLOCK_H_