| // Copyright 2019 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 <endian.h> |
| #include <fidl/fuchsia.hardware.block/cpp/wire.h> |
| #include <fuchsia/hardware/block/driver/c/banjo.h> |
| #include <lib/ddk/debug.h> |
| #include <lib/scsi/disk-dfv1.h> |
| #include <netinet/in.h> |
| #include <zircon/process.h> |
| |
| #include <fbl/alloc_checker.h> |
| |
| #include "src/devices/block/lib/common/include/common-dfv1.h" |
| |
| namespace scsi { |
| |
| zx::result<fbl::RefPtr<Disk>> Disk::Bind(zx_device_t* parent, Controller* controller, |
| uint8_t target, uint16_t lun, uint32_t max_transfer_bytes, |
| DiskOptions disk_options) { |
| fbl::AllocChecker ac; |
| auto disk = fbl::MakeRefCountedChecked<Disk>(&ac, parent, controller, target, lun, disk_options); |
| if (!ac.check()) { |
| return zx::error(ZX_ERR_NO_MEMORY); |
| } |
| auto status = disk->AddDisk(max_transfer_bytes); |
| if (status != ZX_OK) { |
| return zx::error(status); |
| } |
| return zx::ok(disk); |
| } |
| |
| zx_status_t Disk::AddDisk(uint32_t max_transfer_bytes) { |
| zx::result inquiry_data = controller_->Inquiry(target_, lun_); |
| if (inquiry_data.is_error()) { |
| return inquiry_data.status_value(); |
| } |
| // Check that its a direct access block device first. |
| if (inquiry_data.value().peripheral_device_type != 0) { |
| zxlogf(ERROR, "Device is not direct access block device!, device type: 0x%x", |
| inquiry_data.value().peripheral_device_type); |
| return ZX_ERR_IO; |
| } |
| |
| // Print T10 Vendor ID/Product ID |
| auto vendor_id = |
| std::string(inquiry_data.value().t10_vendor_id, sizeof(inquiry_data.value().t10_vendor_id)); |
| auto product_id = |
| std::string(inquiry_data.value().product_id, sizeof(inquiry_data.value().product_id)); |
| // Some vendors don't pad the strings with spaces (0x20). Null-terminate strings to avoid printing |
| // illegal characters. |
| vendor_id = std::string(vendor_id.c_str()); |
| product_id = std::string(product_id.c_str()); |
| zxlogf(INFO, "Target %u LUN %u: Vendor ID = %s, Product ID = %s", target_, lun_, |
| vendor_id.c_str(), product_id.c_str()); |
| |
| removable_ = inquiry_data.value().removable_media(); |
| |
| // Verify that the Lun is ready. This command expects a unit attention error. |
| if (zx_status_t status = controller_->TestUnitReady(target_, lun_); status != ZX_OK) { |
| // TestUnitReady returns ZX_ERR_UNAVAILABLE status if a unit attention error occurred. |
| if (status != ZX_ERR_UNAVAILABLE) { |
| zxlogf(ERROR, "Failed SCSI TEST UNIT READY command: %s", zx_status_get_string(status)); |
| return status; |
| } |
| zxlogf(DEBUG, "Expected Unit Attention error: %s", zx_status_get_string(status)); |
| |
| // Send request sense commands to clear the Unit Attention Condition(UAC) of LUs. UAC is a |
| // condition which needs to be serviced before the logical unit can process commands. |
| // This command will get sense data, but ignore it for now because our goal is to clear the |
| // UAC. |
| scsi::FixedFormatSenseDataHeader request_sense_data; |
| zx_status_t clear_uac_status = |
| controller_->RequestSense(target_, lun_, {&request_sense_data, sizeof(request_sense_data)}); |
| if (clear_uac_status != ZX_OK) { |
| zxlogf(ERROR, "Failed SCSI REQUEST SENSE command: %s", |
| zx_status_get_string(clear_uac_status)); |
| return clear_uac_status; |
| } |
| |
| // Verify that the Lun is ready. This command expects a success. |
| clear_uac_status = controller_->TestUnitReady(target_, lun_); |
| if (clear_uac_status != ZX_OK) { |
| zxlogf(ERROR, "Failed SCSI TEST UNIT READY command: %s", |
| zx_status_get_string(clear_uac_status)); |
| return clear_uac_status; |
| } |
| } |
| |
| zx::result<std::tuple<bool, bool>> parameter = |
| controller_->ModeSenseDpoFuaAndWriteProtectedEnabled(target_, lun_, |
| disk_options_.use_mode_sense_6); |
| if (parameter.is_error()) { |
| zxlogf(WARNING, |
| "Failed to get DPO FUA and write protected parameter for target %u, lun %u: %s.", |
| target_, lun_, zx_status_get_string(parameter.status_value())); |
| return parameter.error_value(); |
| } |
| std::tie(dpo_fua_available_, write_protected_) = parameter.value(); |
| |
| zx::result write_cache_enabled = |
| controller_->ModeSenseWriteCacheEnabled(target_, lun_, disk_options_.use_mode_sense_6); |
| if (write_cache_enabled.is_error()) { |
| zxlogf(WARNING, "Failed to get write cache status for target %u, lun %u: %s.", target_, lun_, |
| zx_status_get_string(write_cache_enabled.status_value())); |
| // Assume write cache is enabled so that flush operations are not ignored. |
| write_cache_enabled_ = true; |
| } else { |
| write_cache_enabled_ = write_cache_enabled.value(); |
| } |
| |
| zx_status_t status = controller_->ReadCapacity(target_, lun_, &block_count_, &block_size_bytes_); |
| if (status != ZX_OK) { |
| return status; |
| } |
| zxlogf(INFO, "%ld blocks of %d bytes", block_count_, block_size_bytes_); |
| |
| zx::result<VPDBlockLimits> block_limits = controller_->InquiryBlockLimits(target_, lun_); |
| if (block_limits.is_ok()) { |
| // A maximum_transfer_length field set to 0 indicates that the device server does not |
| // report a limit on the transfer length. |
| if (betoh32(block_limits->maximum_transfer_blocks) == 0) { |
| max_transfer_bytes_ = max_transfer_bytes; |
| } else { |
| max_transfer_bytes_ = std::min( |
| max_transfer_bytes, betoh32(block_limits->maximum_transfer_blocks) * block_size_bytes_); |
| } |
| } else { |
| max_transfer_bytes_ = max_transfer_bytes; |
| } |
| |
| if (max_transfer_bytes_ == fuchsia_hardware_block::wire::kMaxTransferUnbounded) { |
| max_transfer_blocks_ = UINT32_MAX; |
| } else { |
| if (max_transfer_bytes_ % block_size_bytes_ != 0) { |
| zxlogf(ERROR, "Max transfer size (%u bytes) is not a multiple of the block size (%u bytes).", |
| max_transfer_bytes_, block_size_bytes_); |
| return ZX_ERR_BAD_STATE; |
| } |
| max_transfer_blocks_ = max_transfer_bytes_ / block_size_bytes_; |
| } |
| |
| // If we only need to use the read(10)/write(10) commands, then limit max_transfer_blocks_ and |
| // max_transfer_bytes_. |
| if (block_count_ <= UINT32_MAX && !disk_options_.use_read_write_12 && |
| max_transfer_blocks_ > UINT16_MAX) { |
| max_transfer_blocks_ = UINT16_MAX; |
| max_transfer_bytes_ = max_transfer_blocks_ * block_size_bytes_; |
| } |
| |
| if (disk_options_.check_unmap_support && block_limits.is_ok()) { |
| zx::result unmap_command_supported = controller_->InquirySupportUnmapCommand(target_, lun_); |
| if (unmap_command_supported.is_ok()) { |
| unmap_command_supported_ = |
| unmap_command_supported.value() && betoh32(block_limits->maximum_unmap_lba_count); |
| } |
| } |
| |
| status = DdkAdd(DiskName().c_str()); |
| if (status == ZX_OK) { |
| AddRef(); |
| } |
| return status; |
| } |
| |
| void Disk::DdkRelease() { |
| if (Release()) { |
| delete this; |
| } |
| } |
| |
| void Disk::BlockImplQuery(block_info_t* info_out, size_t* block_op_size_out) { |
| info_out->block_size = block_size_bytes_; |
| info_out->block_count = block_count_; |
| info_out->max_transfer_size = max_transfer_bytes_; |
| info_out->flags = (write_protected_ ? FLAG_READONLY : 0) | (removable_ ? FLAG_REMOVABLE : 0) | |
| (dpo_fua_available_ ? FLAG_FUA_SUPPORT : 0); |
| *block_op_size_out = controller_->BlockOpSize(); |
| } |
| |
| void Disk::BlockImplQueue(block_op_t* op, block_impl_queue_callback completion_cb, void* cookie) { |
| DiskOp* disk_op = containerof(op, DiskOp, op); |
| disk_op->completion_cb = completion_cb; |
| disk_op->cookie = cookie; |
| |
| switch (op->command.opcode) { |
| case BLOCK_OPCODE_READ: |
| case BLOCK_OPCODE_WRITE: { |
| if (zx_status_t status = block::CheckIoRange(op->rw, block_count_, max_transfer_blocks_); |
| status != ZX_OK) { |
| completion_cb(cookie, status, op); |
| return; |
| } |
| const bool is_write = op->command.opcode == BLOCK_OPCODE_WRITE; |
| const bool is_fua = op->command.flags & BLOCK_IO_FLAG_FORCE_ACCESS; |
| if (!dpo_fua_available_ && is_fua) { |
| completion_cb(cookie, ZX_ERR_NOT_SUPPORTED, op); |
| return; |
| } |
| |
| uint8_t cdb_buffer[16] = {}; |
| uint8_t cdb_length; |
| if (block_count_ > UINT32_MAX) { |
| auto cdb = reinterpret_cast<Read16CDB*>(cdb_buffer); // Struct-wise equiv. to Write16CDB. |
| cdb_length = 16; |
| cdb->opcode = is_write ? Opcode::WRITE_16 : Opcode::READ_16; |
| cdb->logical_block_address = htobe64(op->rw.offset_dev); |
| cdb->transfer_length = htobe32(op->rw.length); |
| cdb->set_force_unit_access(is_fua); |
| } else if (disk_options_.use_read_write_12) { |
| auto cdb = reinterpret_cast<Read12CDB*>(cdb_buffer); // Struct-wise equiv. to Write12CDB. |
| cdb_length = 12; |
| cdb->opcode = is_write ? Opcode::WRITE_12 : Opcode::READ_12; |
| cdb->logical_block_address = htobe32(static_cast<uint32_t>(op->rw.offset_dev)); |
| cdb->transfer_length = htobe32(op->rw.length); |
| cdb->set_force_unit_access(is_fua); |
| } else { |
| auto cdb = reinterpret_cast<Read10CDB*>(cdb_buffer); // Struct-wise equiv. to Write10CDB. |
| cdb_length = 10; |
| cdb->opcode = is_write ? Opcode::WRITE_10 : Opcode::READ_10; |
| cdb->logical_block_address = htobe32(static_cast<uint32_t>(op->rw.offset_dev)); |
| cdb->transfer_length = htobe16(static_cast<uint16_t>(op->rw.length)); |
| cdb->set_force_unit_access(is_fua); |
| } |
| ZX_ASSERT(cdb_length <= sizeof(cdb_buffer)); |
| controller_->ExecuteCommandAsync(target_, lun_, {cdb_buffer, cdb_length}, is_write, |
| block_size_bytes_, disk_op, {nullptr, 0}); |
| return; |
| } |
| case BLOCK_OPCODE_FLUSH: { |
| if (zx_status_t status = block::CheckFlushValid(op->rw); status != ZX_OK) { |
| completion_cb(cookie, status, op); |
| return; |
| } |
| if (!write_cache_enabled_) { |
| completion_cb(cookie, ZX_OK, op); |
| return; |
| } |
| SynchronizeCache10CDB cdb = {}; |
| cdb.opcode = Opcode::SYNCHRONIZE_CACHE_10; |
| // Prefer writing to storage medium (instead of nv cache) and return only |
| // after completion of operation. |
| cdb.reserved_and_immed = 0; |
| // Ideally this would flush specific blocks, but several platforms don't |
| // support this functionality, so just synchronize the whole disk. |
| cdb.logical_block_address = 0; |
| cdb.number_of_logical_blocks = 0; |
| controller_->ExecuteCommandAsync(target_, lun_, {&cdb, sizeof(cdb)}, |
| /*is_write=*/false, block_size_bytes_, disk_op, |
| {nullptr, 0}); |
| return; |
| } |
| case BLOCK_OPCODE_TRIM: { |
| if (!unmap_command_supported_) { |
| completion_cb(cookie, ZX_ERR_NOT_SUPPORTED, op); |
| return; |
| } |
| if (zx_status_t status = block::CheckIoRange(op->trim, block_count_, max_transfer_blocks_); |
| status != ZX_OK) { |
| completion_cb(cookie, status, op); |
| return; |
| } |
| UnmapCDB cdb = {}; |
| cdb.opcode = Opcode::UNMAP; |
| |
| // block_trim can only pass a single block slice. |
| constexpr uint32_t block_descriptor_count = 1; |
| // The SCSI UNMAP command requires separate data to be sent for the UNMAP parameter list. |
| uint8_t data[sizeof(UnmapParameterListHeader) + |
| (sizeof(UnmapBlockDescriptor) * block_descriptor_count)] = {}; |
| cdb.parameter_list_length = htobe16(sizeof(data)); |
| |
| UnmapParameterListHeader* patameter_list_header = |
| reinterpret_cast<UnmapParameterListHeader*>(data); |
| patameter_list_header->data_length = |
| htobe16(sizeof(UnmapParameterListHeader) - sizeof(patameter_list_header->data_length) + |
| sizeof(UnmapBlockDescriptor)); |
| patameter_list_header->block_descriptor_data_length = htobe16(sizeof(UnmapBlockDescriptor)); |
| |
| UnmapBlockDescriptor* block_descriptor = |
| reinterpret_cast<UnmapBlockDescriptor*>(data + sizeof(UnmapParameterListHeader)); |
| block_descriptor->logical_block_address = htobe64(op->trim.offset_dev); |
| block_descriptor->blocks = htobe32(op->trim.length); |
| |
| controller_->ExecuteCommandAsync(target_, lun_, {&cdb, sizeof(cdb)}, /*is_write=*/true, |
| block_size_bytes_, disk_op, {&data, sizeof(data)}); |
| return; |
| } |
| default: |
| completion_cb(cookie, ZX_ERR_NOT_SUPPORTED, op); |
| return; |
| } |
| } |
| |
| } // namespace scsi |
