| // Copyright 2016 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. |
| #pragma once |
| |
| #include "device.h" |
| #include "ring.h" |
| |
| #include <stdlib.h> |
| #include <zircon/compiler.h> |
| |
| #include "backends/backend.h" |
| #include <virtio/block.h> |
| #include <zircon/device/block.h> |
| #include <ddk/protocol/block.h> |
| |
| #include <sync/completion.h> |
| |
| namespace virtio { |
| |
| struct block_txn_t { |
| block_op_t op; |
| struct vring_desc* desc; |
| size_t index; |
| list_node_t node; |
| zx_paddr_t pin_base; |
| }; |
| |
| class Ring; |
| |
| class BlockDevice : public Device { |
| public: |
| BlockDevice(zx_device_t* device, zx::bti bti, fbl::unique_ptr<Backend> backend); |
| virtual ~BlockDevice(); |
| |
| virtual zx_status_t Init() override; |
| |
| virtual void IrqRingUpdate() override; |
| virtual void IrqConfigChange() override; |
| |
| uint64_t GetSize() const { return config_.capacity * config_.blk_size; } |
| uint32_t GetBlockSize() const { return config_.blk_size; } |
| uint64_t GetBlockCount() const { return config_.capacity; } |
| const char* tag() const override { return "virtio-blk"; } |
| |
| private: |
| // DDK driver hooks |
| static zx_off_t virtio_block_get_size(void* ctx); |
| static zx_status_t virtio_block_ioctl(void* ctx, uint32_t op, const void* in_buf, size_t in_len, |
| void* out_buf, size_t out_len, size_t* out_actual); |
| |
| static void virtio_block_query(void* ctx, block_info_t* bi, size_t* bopsz); |
| static void virtio_block_queue(void* ctx, block_op_t* bop); |
| |
| void GetInfo(block_info_t* info); |
| |
| zx_status_t QueueTxn(block_txn_t* txn, bool write, size_t bytes, |
| uint64_t* pages, size_t pagecount, uint16_t* idx); |
| void QueueReadWriteTxn(block_txn_t* txn, bool write); |
| |
| void txn_complete(block_txn_t* txn, zx_status_t status); |
| |
| // the main virtio ring |
| Ring vring_ = {this}; |
| |
| // lock to be used around Ring::AllocDescChain and FreeDesc |
| // TODO: move this into Ring class once it's certain that other |
| // users of the class are okay with it. |
| fbl::Mutex ring_lock_; |
| |
| static const uint16_t ring_size = 128; // 128 matches legacy pci |
| |
| // saved block device configuration out of the pci config BAR |
| virtio_blk_config_t config_ = {}; |
| |
| // a queue of block request/responses |
| static const size_t blk_req_count = 32; |
| |
| io_buffer_t blk_req_buf_; |
| virtio_blk_req_t* blk_req_ = nullptr; |
| |
| zx_paddr_t blk_res_pa_ = 0; |
| uint8_t* blk_res_ = nullptr; |
| |
| uint32_t blk_req_bitmap_ = 0; |
| static_assert(blk_req_count <= sizeof(blk_req_bitmap_) * CHAR_BIT, ""); |
| |
| size_t alloc_blk_req() { |
| size_t i = 0; |
| if (blk_req_bitmap_ != 0) |
| i = sizeof(blk_req_bitmap_) * CHAR_BIT - __builtin_clz(blk_req_bitmap_); |
| blk_req_bitmap_ |= (1 << i); |
| return i; |
| } |
| |
| void free_blk_req(size_t i) { |
| blk_req_bitmap_ &= ~(1 << i); |
| } |
| |
| // pending iotxns and waiter state |
| fbl::Mutex txn_lock_; |
| list_node txn_list_ = LIST_INITIAL_VALUE(txn_list_); |
| bool txn_wait_ = false; |
| completion_t txn_signal_; |
| |
| block_protocol_ops_t block_ops_ = {}; |
| }; |
| |
| } // namespace virtio |