| // Copyright 2018 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. |
| |
| #include "skip-block.h" |
| |
| #include <lib/fzl/vmo-mapper.h> |
| #include <lib/sync/completion.h> |
| #include <lib/zx/vmo.h> |
| #include <string.h> |
| #include <zircon/boot/image.h> |
| #include <zircon/status.h> |
| |
| #include <algorithm> |
| #include <memory> |
| #include <utility> |
| |
| #include <ddk/binding.h> |
| #include <ddk/debug.h> |
| #include <ddk/device.h> |
| #include <ddk/driver.h> |
| #include <ddk/metadata.h> |
| #include <ddk/protocol/badblock.h> |
| #include <ddk/protocol/nand.h> |
| #include <ddktl/fidl.h> |
| #include <fbl/algorithm.h> |
| #include <fbl/alloc_checker.h> |
| #include <fbl/auto_lock.h> |
| |
| namespace nand { |
| |
| namespace { |
| |
| struct BlockOperationContext { |
| ReadWriteOperation op; |
| fuchsia_hardware_nand_Info* nand_info; |
| LogicalToPhysicalMap* block_map; |
| ddk::NandProtocolClient* nand; |
| uint32_t copy; |
| uint32_t current_block; |
| uint32_t physical_block; |
| sync_completion_t* completion_event; |
| zx_status_t status; |
| bool mark_bad; |
| }; |
| |
| // Called when all page reads in a block finish. If another block still needs |
| // to be read, it queues it up as another operation. |
| void ReadCompletionCallback(void* cookie, zx_status_t status, nand_operation_t* op) { |
| auto* ctx = static_cast<BlockOperationContext*>(cookie); |
| if (status != ZX_OK || ctx->current_block + 1 == ctx->op.block + ctx->op.block_count) { |
| ctx->status = status; |
| ctx->mark_bad = false; |
| sync_completion_signal(ctx->completion_event); |
| return; |
| } |
| ctx->current_block += 1; |
| |
| status = ctx->block_map->GetPhysical(ctx->copy, ctx->current_block, &ctx->physical_block); |
| if (status != ZX_OK) { |
| ctx->status = status; |
| ctx->mark_bad = false; |
| sync_completion_signal(ctx->completion_event); |
| return; |
| } |
| |
| op->rw.offset_nand = ctx->physical_block * ctx->nand_info->pages_per_block; |
| op->rw.offset_data_vmo += ctx->nand_info->pages_per_block; |
| ctx->nand->Queue(op, ReadCompletionCallback, cookie); |
| return; |
| } |
| |
| void EraseCompletionCallback(void* cookie, zx_status_t status, nand_operation_t* op); |
| |
| // Called when all page writes in a block finish. If another block still needs |
| // to be written, it queues up an erase. |
| void WriteCompletionCallback(void* cookie, zx_status_t status, nand_operation_t* op) { |
| auto* ctx = static_cast<BlockOperationContext*>(cookie); |
| |
| if (status != ZX_OK || ctx->current_block + 1 == ctx->op.block + ctx->op.block_count) { |
| ctx->status = status; |
| ctx->mark_bad = (status == ZX_ERR_IO); |
| sync_completion_signal(ctx->completion_event); |
| return; |
| } |
| ctx->current_block += 1; |
| |
| status = ctx->block_map->GetPhysical(ctx->copy, ctx->current_block, &ctx->physical_block); |
| if (status != ZX_OK) { |
| ctx->status = status; |
| ctx->mark_bad = false; |
| sync_completion_signal(ctx->completion_event); |
| return; |
| } |
| op->erase.command = NAND_OP_ERASE; |
| op->erase.first_block = ctx->physical_block; |
| op->erase.num_blocks = 1; |
| ctx->nand->Queue(op, EraseCompletionCallback, cookie); |
| return; |
| } |
| |
| // Called when a block erase operation finishes. Subsequently queues up writes |
| // to the block. |
| void EraseCompletionCallback(void* cookie, zx_status_t status, nand_operation_t* op) { |
| auto* ctx = static_cast<BlockOperationContext*>(cookie); |
| |
| if (status != ZX_OK) { |
| ctx->status = status; |
| ctx->mark_bad = (status == ZX_ERR_IO); |
| sync_completion_signal(ctx->completion_event); |
| return; |
| } |
| const size_t vmo_offset = |
| ctx->op.vmo_offset + ((ctx->current_block - ctx->op.block) * ctx->nand_info->pages_per_block); |
| op->rw.command = NAND_OP_WRITE; |
| op->rw.data_vmo = ctx->op.vmo.get(); |
| op->rw.oob_vmo = ZX_HANDLE_INVALID; |
| op->rw.length = ctx->nand_info->pages_per_block; |
| op->rw.offset_nand = ctx->physical_block * ctx->nand_info->pages_per_block; |
| op->rw.offset_data_vmo = vmo_offset; |
| ctx->nand->Queue(op, WriteCompletionCallback, cookie); |
| return; |
| } |
| |
| } // namespace |
| |
| zx_status_t SkipBlockDevice::Create(void*, zx_device_t* parent) { |
| // Get NAND protocol. |
| ddk::NandProtocolClient nand(parent); |
| if (!nand.is_valid()) { |
| zxlogf(ERROR, "skip-block: parent device '%s': does not support nand protocol\n", |
| device_get_name(parent)); |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| |
| // Get bad block protocol. |
| ddk::BadBlockProtocolClient bad_block(parent); |
| if (!bad_block.is_valid()) { |
| zxlogf(ERROR, "skip-block: parent device '%s': does not support bad_block protocol\n", |
| device_get_name(parent)); |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| |
| uint32_t copy_count; |
| size_t actual; |
| zx_status_t status = device_get_metadata(parent, DEVICE_METADATA_PRIVATE, ©_count, |
| sizeof(copy_count), &actual); |
| if (status != ZX_OK) { |
| zxlogf(ERROR, "skip-block: parent device '%s' has no private metadata\n", |
| device_get_name(parent)); |
| return status; |
| } |
| if (actual != sizeof(copy_count)) { |
| zxlogf(ERROR, "skip-block: Private metadata is of size %zu, expected to be %zu\n", actual, |
| sizeof(copy_count)); |
| return ZX_ERR_INTERNAL; |
| } |
| |
| fbl::AllocChecker ac; |
| std::unique_ptr<SkipBlockDevice> device(new (&ac) |
| SkipBlockDevice(parent, nand, bad_block, copy_count)); |
| if (!ac.check()) { |
| return ZX_ERR_NO_MEMORY; |
| } |
| |
| status = device->Bind(); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| // devmgr is now in charge of the device. |
| __UNUSED auto* dummy = device.release(); |
| return ZX_OK; |
| } |
| |
| zx_status_t SkipBlockDevice::GetBadBlockList(fbl::Array<uint32_t>* bad_blocks) { |
| size_t bad_block_count; |
| zx_status_t status = bad_block_.GetBadBlockList(nullptr, 0, &bad_block_count); |
| if (status != ZX_OK) { |
| return status; |
| } |
| if (bad_block_count == 0) { |
| bad_blocks->reset(); |
| return ZX_OK; |
| } |
| const size_t bad_block_list_len = bad_block_count; |
| std::unique_ptr<uint32_t[]> bad_block_list(new uint32_t[bad_block_count]); |
| memset(bad_block_list.get(), 0, sizeof(uint32_t) * bad_block_count); |
| status = bad_block_.GetBadBlockList(bad_block_list.get(), bad_block_list_len, &bad_block_count); |
| if (status != ZX_OK) { |
| return status; |
| } |
| if (bad_block_list_len != bad_block_count) { |
| return ZX_ERR_INTERNAL; |
| } |
| *bad_blocks = fbl::Array<uint32_t>(bad_block_list.release(), bad_block_count); |
| return ZX_OK; |
| } |
| |
| zx_status_t SkipBlockDevice::Bind() { |
| zxlogf(INFO, "skip-block: Binding to %s\n", device_get_name(parent())); |
| |
| fbl::AutoLock al(&lock_); |
| |
| if (sizeof(nand_operation_t) > parent_op_size_) { |
| zxlogf(ERROR, "skip-block: parent op size, %zu, is smaller than minimum op size: %zu\n", |
| parent_op_size_, sizeof(nand_operation_t)); |
| return ZX_ERR_INTERNAL; |
| } |
| |
| nand_op_ = NandOperation::Alloc(parent_op_size_); |
| if (!nand_op_) { |
| return ZX_ERR_NO_MEMORY; |
| } |
| |
| // TODO(surajmalhotra): Potentially make this lazy instead of in the bind. |
| fbl::Array<uint32_t> bad_blocks; |
| const zx_status_t status = GetBadBlockList(&bad_blocks); |
| if (status != ZX_OK) { |
| zxlogf(ERROR, "skip-block: Failed to get bad block list\n"); |
| return status; |
| } |
| block_map_ = LogicalToPhysicalMap(copy_count_, nand_info_.num_blocks, std::move(bad_blocks)); |
| |
| return DdkAdd("skip-block"); |
| } |
| |
| void SkipBlockDevice::GetPartitionInfo(GetPartitionInfoCompleter::Sync completer) { |
| fbl::AutoLock al(&lock_); |
| |
| PartitionInfo info; |
| info.block_size_bytes = GetBlockSize(); |
| info.partition_block_count = GetBlockCountLocked(); |
| memcpy(info.partition_guid.data(), nand_info_.partition_guid, ZBI_PARTITION_GUID_LEN); |
| |
| completer.Reply(ZX_OK, info); |
| } |
| |
| zx_status_t SkipBlockDevice::ValidateOperationLocked(const ReadWriteOperation& op) const { |
| if (op.block_count == 0) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| if (op.block + op.block_count > GetBlockCountLocked()) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| |
| uint64_t vmo_size; |
| zx_status_t status = op.vmo.get_size(&vmo_size); |
| if (status != ZX_OK) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| if (vmo_size < op.vmo_offset + op.block_count * GetBlockSize()) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| return ZX_OK; |
| } |
| |
| zx_status_t SkipBlockDevice::ValidateOperationLocked(const WriteBytesOperation& op) const { |
| if (op.size == 0) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| if (op.offset % nand_info_.page_size != 0 || op.size % nand_info_.page_size != 0) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| if (fbl::round_up(op.offset + op.size, GetBlockSize()) > GetBlockCountLocked() * GetBlockSize()) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| |
| uint64_t vmo_size; |
| zx_status_t status = op.vmo.get_size(&vmo_size); |
| if (status != ZX_OK) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| if (vmo_size < op.vmo_offset + op.size) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| return ZX_OK; |
| } |
| |
| zx_status_t SkipBlockDevice::ReadLocked(ReadWriteOperation op) { |
| for (uint32_t copy = 0; copy < copy_count_; copy++) { |
| if (block_map_.AvailableBlockCount(copy) < op.block_count) { |
| zxlogf(INFO, "skipblock: copy %u too small, skipping read attempt.\n", copy); |
| continue; |
| } |
| |
| uint32_t physical_block; |
| zx_status_t status = block_map_.GetPhysical(copy, op.block, &physical_block); |
| if (status != ZX_OK) { |
| return status; |
| } |
| sync_completion_t completion; |
| BlockOperationContext op_context = { |
| .op = std::move(op), |
| .nand_info = &nand_info_, |
| .block_map = &block_map_, |
| .nand = &nand_, |
| .copy = copy, |
| .current_block = op.block, |
| .physical_block = physical_block, |
| .completion_event = &completion, |
| .status = ZX_OK, |
| .mark_bad = false, |
| }; |
| |
| nand_operation_t* nand_op = nand_op_->operation(); |
| nand_op->rw.command = NAND_OP_READ; |
| nand_op->rw.data_vmo = op_context.op.vmo.get(); |
| nand_op->rw.oob_vmo = ZX_HANDLE_INVALID; |
| nand_op->rw.length = nand_info_.pages_per_block; |
| nand_op->rw.offset_nand = physical_block * nand_info_.pages_per_block; |
| nand_op->rw.offset_data_vmo = op.vmo_offset; |
| // The read callback will enqueue subsequent reads. |
| nand_.Queue(nand_op, ReadCompletionCallback, &op_context); |
| |
| // Wait on completion. |
| sync_completion_wait(&completion, ZX_TIME_INFINITE); |
| op = std::move(op_context.op); |
| if (op_context.status == ZX_OK) { |
| return ZX_OK; |
| } |
| zxlogf(WARN, "skipblock: Failed to read block %d, copy %d, with status %s\n", |
| op_context.current_block, copy, zx_status_get_string(op_context.status)); |
| } |
| zxlogf(ERROR, "skipblock: Failed to read any copies of block %d\n", op.block); |
| return ZX_ERR_IO; |
| } |
| |
| void SkipBlockDevice::Read(ReadWriteOperation op, ReadCompleter::Sync completer) { |
| fbl::AutoLock al(&lock_); |
| |
| zx_status_t status = ValidateOperationLocked(op); |
| if (status != ZX_OK) { |
| completer.Reply(status); |
| return; |
| } |
| completer.Reply(ReadLocked(std::move(op))); |
| } |
| |
| zx_status_t SkipBlockDevice::WriteLocked(ReadWriteOperation op, bool* bad_block_grown) { |
| *bad_block_grown = false; |
| |
| bool one_copy_succeeded = false; |
| for (uint32_t copy = 0; copy < copy_count_; copy++) { |
| for (;;) { |
| if (op.block >= block_map_.AvailableBlockCount(copy)) { |
| break; |
| } |
| uint32_t physical_block; |
| zx_status_t status = block_map_.GetPhysical(copy, op.block, &physical_block); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| sync_completion_t completion; |
| BlockOperationContext op_context = { |
| .op = std::move(op), |
| .nand_info = &nand_info_, |
| .block_map = &block_map_, |
| .nand = &nand_, |
| .copy = copy, |
| .current_block = op.block, |
| .physical_block = physical_block, |
| .completion_event = &completion, |
| .status = ZX_OK, |
| .mark_bad = false, |
| }; |
| |
| nand_operation_t* nand_op = nand_op_->operation(); |
| nand_op->erase.command = NAND_OP_ERASE; |
| nand_op->erase.first_block = physical_block; |
| nand_op->erase.num_blocks = 1; |
| // The erase callback will enqueue subsequent writes and erases. |
| nand_.Queue(nand_op, EraseCompletionCallback, &op_context); |
| |
| // Wait on completion. |
| sync_completion_wait(&completion, ZX_TIME_INFINITE); |
| op = std::move(op_context.op); |
| if (op_context.mark_bad) { |
| zxlogf(ERROR, "Failed to erase/write block %u, marking bad\n", op_context.physical_block); |
| status = bad_block_.MarkBlockBad(op_context.physical_block); |
| if (status != ZX_OK) { |
| zxlogf(ERROR, "skip-block: Failed to mark block bad\n"); |
| return status; |
| } |
| // Logical to physical mapping has changed, so we need to re-initialize block_map_. |
| fbl::Array<uint32_t> bad_blocks; |
| // TODO(surajmalhotra): Make it impossible for this to fail. |
| ZX_ASSERT(GetBadBlockList(&bad_blocks) == ZX_OK); |
| block_map_ = |
| LogicalToPhysicalMap(copy_count_, nand_info_.num_blocks, std::move(bad_blocks)); |
| *bad_block_grown = true; |
| continue; |
| } |
| if (op_context.status != ZX_OK) { |
| zxlogf(ERROR, "Failed to write block %d, copy %d with status %s\n", |
| op_context.current_block, copy, zx_status_get_string(op_context.status)); |
| break; |
| } |
| one_copy_succeeded = true; |
| break; |
| } |
| } |
| if (!one_copy_succeeded) { |
| return ZX_ERR_IO; |
| } |
| return ZX_OK; |
| } |
| |
| void SkipBlockDevice::Write(ReadWriteOperation op, WriteCompleter::Sync completer) { |
| fbl::AutoLock al(&lock_); |
| |
| bool bad_block_grown = false; |
| zx_status_t status = ValidateOperationLocked(op); |
| if (status != ZX_OK) { |
| completer.Reply(status, bad_block_grown); |
| return; |
| } |
| |
| status = WriteLocked(std::move(op), &bad_block_grown); |
| completer.Reply(status, bad_block_grown); |
| } |
| |
| zx_status_t SkipBlockDevice::ReadPartialBlocksLocked(WriteBytesOperation op, uint64_t block_size, |
| uint64_t first_block, uint64_t last_block, |
| uint64_t op_size, zx::vmo* vmo) { |
| zx_status_t status = zx::vmo::create(op_size, 0, vmo); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| if (op.offset % block_size) { |
| // Need to read first block. |
| zx::vmo dup; |
| status = vmo->duplicate(ZX_RIGHT_SAME_RIGHTS, &dup); |
| if (status != ZX_OK) { |
| return status; |
| } |
| ReadWriteOperation rw_op = { |
| .vmo = std::move(dup), |
| .vmo_offset = 0, |
| .block = static_cast<uint32_t>(first_block), |
| .block_count = 1, |
| }; |
| status = ReadLocked(std::move(rw_op)); |
| if (status != ZX_OK) { |
| return status; |
| } |
| } |
| |
| if ((first_block != last_block || op.offset % block_size == 0) && |
| (op.offset + op.size) % block_size != 0) { |
| // Need to read last block. |
| zx::vmo dup; |
| status = vmo->duplicate(ZX_RIGHT_SAME_RIGHTS, &dup); |
| if (status != ZX_OK) { |
| return status; |
| } |
| ReadWriteOperation rw_op = { |
| .vmo = std::move(dup), |
| .vmo_offset = last_block * block_size, |
| .block = static_cast<uint32_t>(last_block), |
| .block_count = 1, |
| }; |
| status = ReadLocked(std::move(rw_op)); |
| if (status != ZX_OK) { |
| return status; |
| } |
| } |
| |
| // Copy from input vmo to newly created one. |
| fzl::VmoMapper mapper; |
| const size_t vmo_page_offset = op.vmo_offset % ZX_PAGE_SIZE; |
| status = mapper.Map(op.vmo, fbl::round_down(op.vmo_offset, ZX_PAGE_SIZE), |
| fbl::round_up(vmo_page_offset + op.size, ZX_PAGE_SIZE), ZX_VM_PERM_READ); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| status = vmo->write(static_cast<uint8_t*>(mapper.start()) + vmo_page_offset, |
| op.offset % block_size, op.size); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| return ZX_OK; |
| } |
| |
| void SkipBlockDevice::WriteBytes(WriteBytesOperation op, WriteBytesCompleter::Sync completer) { |
| fbl::AutoLock al(&lock_); |
| |
| bool bad_block_grown = false; |
| zx_status_t status = ValidateOperationLocked(op); |
| if (status != ZX_OK) { |
| completer.Reply(status, bad_block_grown); |
| return; |
| } |
| |
| const uint64_t block_size = GetBlockSize(); |
| const uint64_t first_block = op.offset / block_size; |
| const uint64_t last_block = fbl::round_up(op.offset + op.size, block_size) / block_size - 1; |
| const uint64_t op_size = (last_block - first_block + 1) * block_size; |
| |
| zx::vmo vmo; |
| if (op_size == op.size) { |
| // No copies are necessary as offset and size are block aligned. |
| vmo = std::move(op.vmo); |
| } else { |
| status = |
| ReadPartialBlocksLocked(std::move(op), block_size, first_block, last_block, op_size, &vmo); |
| if (status != ZX_OK) { |
| completer.Reply(status, bad_block_grown); |
| return; |
| } |
| } |
| |
| // Now issue normal write. |
| ReadWriteOperation rw_op = { |
| .vmo = std::move(vmo), |
| .vmo_offset = 0, |
| .block = static_cast<uint32_t>(first_block), |
| .block_count = static_cast<uint32_t>(last_block - first_block + 1), |
| }; |
| status = WriteLocked(std::move(rw_op), &bad_block_grown); |
| completer.Reply(status, bad_block_grown); |
| } |
| |
| uint32_t SkipBlockDevice::GetBlockCountLocked() const { |
| uint32_t logical_block_count = 0; |
| for (uint32_t copy = 0; copy < copy_count_; copy++) { |
| logical_block_count = std::max(logical_block_count, block_map_.AvailableBlockCount(copy)); |
| } |
| return logical_block_count; |
| } |
| |
| zx_off_t SkipBlockDevice::DdkGetSize() { |
| fbl::AutoLock al(&lock_); |
| return GetBlockSize() * GetBlockCountLocked(); |
| } |
| |
| zx_status_t SkipBlockDevice::DdkMessage(fidl_msg_t* msg, fidl_txn_t* txn) { |
| DdkTransaction transaction(txn); |
| llcpp::fuchsia::hardware::skipblock::SkipBlock::Dispatch(this, msg, &transaction); |
| return transaction.Status(); |
| } |
| |
| static constexpr zx_driver_ops_t driver_ops = []() { |
| zx_driver_ops_t ops = {}; |
| ops.version = DRIVER_OPS_VERSION; |
| ops.bind = SkipBlockDevice::Create; |
| return ops; |
| }(); |
| |
| } // namespace nand |
| |
| // clang-format off |
| ZIRCON_DRIVER_BEGIN(skip_block, nand::driver_ops, "zircon", "0.1", 2) |
| BI_ABORT_IF(NE, BIND_PROTOCOL, ZX_PROTOCOL_NAND), |
| BI_MATCH_IF(EQ, BIND_NAND_CLASS, fuchsia_hardware_nand_Class_BBS), |
| ZIRCON_DRIVER_END(skip_block) |
| // clang-format on |