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2252 lines
59 KiB
2252 lines
59 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2009, Microsoft Corporation. |
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* |
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* Authors: |
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* Haiyang Zhang <[email protected]> |
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* Hank Janssen <[email protected]> |
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* K. Y. Srinivasan <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/wait.h> |
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#include <linux/sched.h> |
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#include <linux/completion.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/hyperv.h> |
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#include <linux/blkdev.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_tcq.h> |
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#include <scsi/scsi_eh.h> |
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#include <scsi/scsi_devinfo.h> |
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#include <scsi/scsi_dbg.h> |
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#include <scsi/scsi_transport_fc.h> |
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#include <scsi/scsi_transport.h> |
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|
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/* |
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* All wire protocol details (storage protocol between the guest and the host) |
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* are consolidated here. |
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* |
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* Begin protocol definitions. |
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*/ |
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|
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/* |
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* Version history: |
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* V1 Beta: 0.1 |
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* V1 RC < 2008/1/31: 1.0 |
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* V1 RC > 2008/1/31: 2.0 |
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* Win7: 4.2 |
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* Win8: 5.1 |
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* Win8.1: 6.0 |
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* Win10: 6.2 |
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*/ |
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|
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#define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ |
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(((MINOR_) & 0xff))) |
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|
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#define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) |
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#define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) |
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#define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) |
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#define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) |
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#define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) |
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|
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/* Packet structure describing virtual storage requests. */ |
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enum vstor_packet_operation { |
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VSTOR_OPERATION_COMPLETE_IO = 1, |
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VSTOR_OPERATION_REMOVE_DEVICE = 2, |
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VSTOR_OPERATION_EXECUTE_SRB = 3, |
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VSTOR_OPERATION_RESET_LUN = 4, |
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VSTOR_OPERATION_RESET_ADAPTER = 5, |
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VSTOR_OPERATION_RESET_BUS = 6, |
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VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, |
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VSTOR_OPERATION_END_INITIALIZATION = 8, |
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VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, |
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VSTOR_OPERATION_QUERY_PROPERTIES = 10, |
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VSTOR_OPERATION_ENUMERATE_BUS = 11, |
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VSTOR_OPERATION_FCHBA_DATA = 12, |
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VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, |
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VSTOR_OPERATION_MAXIMUM = 13 |
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}; |
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|
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/* |
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* WWN packet for Fibre Channel HBA |
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*/ |
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|
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struct hv_fc_wwn_packet { |
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u8 primary_active; |
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u8 reserved1[3]; |
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u8 primary_port_wwn[8]; |
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u8 primary_node_wwn[8]; |
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u8 secondary_port_wwn[8]; |
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u8 secondary_node_wwn[8]; |
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}; |
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|
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/* |
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* SRB Flag Bits |
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*/ |
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|
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#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 |
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#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 |
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#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 |
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#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 |
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#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 |
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#define SRB_FLAGS_DATA_IN 0x00000040 |
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#define SRB_FLAGS_DATA_OUT 0x00000080 |
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#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 |
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#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) |
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#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 |
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#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 |
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#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 |
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|
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/* |
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* This flag indicates the request is part of the workflow for processing a D3. |
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*/ |
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#define SRB_FLAGS_D3_PROCESSING 0x00000800 |
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#define SRB_FLAGS_IS_ACTIVE 0x00010000 |
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#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 |
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#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 |
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#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 |
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#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 |
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#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 |
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#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 |
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#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 |
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#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 |
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#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 |
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|
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#define SP_UNTAGGED ((unsigned char) ~0) |
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#define SRB_SIMPLE_TAG_REQUEST 0x20 |
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|
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/* |
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* Platform neutral description of a scsi request - |
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* this remains the same across the write regardless of 32/64 bit |
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* note: it's patterned off the SCSI_PASS_THROUGH structure |
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*/ |
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#define STORVSC_MAX_CMD_LEN 0x10 |
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|
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#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 |
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#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 |
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|
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#define STORVSC_SENSE_BUFFER_SIZE 0x14 |
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#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 |
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|
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/* |
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* Sense buffer size changed in win8; have a run-time |
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* variable to track the size we should use. This value will |
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* likely change during protocol negotiation but it is valid |
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* to start by assuming pre-Win8. |
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*/ |
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static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; |
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|
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/* |
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* The storage protocol version is determined during the |
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* initial exchange with the host. It will indicate which |
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* storage functionality is available in the host. |
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*/ |
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static int vmstor_proto_version; |
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|
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#define STORVSC_LOGGING_NONE 0 |
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#define STORVSC_LOGGING_ERROR 1 |
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#define STORVSC_LOGGING_WARN 2 |
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|
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static int logging_level = STORVSC_LOGGING_ERROR; |
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module_param(logging_level, int, S_IRUGO|S_IWUSR); |
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MODULE_PARM_DESC(logging_level, |
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"Logging level, 0 - None, 1 - Error (default), 2 - Warning."); |
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|
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static inline bool do_logging(int level) |
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{ |
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return logging_level >= level; |
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} |
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|
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#define storvsc_log(dev, level, fmt, ...) \ |
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do { \ |
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if (do_logging(level)) \ |
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dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ |
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} while (0) |
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|
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struct vmscsi_win8_extension { |
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/* |
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* The following were added in Windows 8 |
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*/ |
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u16 reserve; |
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u8 queue_tag; |
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u8 queue_action; |
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u32 srb_flags; |
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u32 time_out_value; |
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u32 queue_sort_ey; |
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} __packed; |
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|
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struct vmscsi_request { |
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u16 length; |
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u8 srb_status; |
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u8 scsi_status; |
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|
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u8 port_number; |
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u8 path_id; |
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u8 target_id; |
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u8 lun; |
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|
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u8 cdb_length; |
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u8 sense_info_length; |
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u8 data_in; |
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u8 reserved; |
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|
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u32 data_transfer_length; |
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|
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union { |
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u8 cdb[STORVSC_MAX_CMD_LEN]; |
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u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; |
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u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; |
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}; |
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/* |
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* The following was added in win8. |
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*/ |
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struct vmscsi_win8_extension win8_extension; |
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|
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} __attribute((packed)); |
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|
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/* |
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* The list of storage protocols in order of preference. |
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*/ |
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struct vmstor_protocol { |
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int protocol_version; |
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int sense_buffer_size; |
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int vmscsi_size_delta; |
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}; |
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|
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static const struct vmstor_protocol vmstor_protocols[] = { |
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{ |
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VMSTOR_PROTO_VERSION_WIN10, |
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POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, |
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0 |
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}, |
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{ |
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VMSTOR_PROTO_VERSION_WIN8_1, |
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POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, |
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0 |
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}, |
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{ |
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VMSTOR_PROTO_VERSION_WIN8, |
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POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, |
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0 |
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}, |
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{ |
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VMSTOR_PROTO_VERSION_WIN7, |
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PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, |
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sizeof(struct vmscsi_win8_extension), |
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}, |
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{ |
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VMSTOR_PROTO_VERSION_WIN6, |
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PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, |
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sizeof(struct vmscsi_win8_extension), |
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} |
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}; |
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|
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|
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/* |
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* This structure is sent during the initialization phase to get the different |
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* properties of the channel. |
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*/ |
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|
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#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 |
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|
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struct vmstorage_channel_properties { |
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u32 reserved; |
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u16 max_channel_cnt; |
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u16 reserved1; |
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|
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u32 flags; |
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u32 max_transfer_bytes; |
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|
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u64 reserved2; |
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} __packed; |
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|
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/* This structure is sent during the storage protocol negotiations. */ |
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struct vmstorage_protocol_version { |
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/* Major (MSW) and minor (LSW) version numbers. */ |
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u16 major_minor; |
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|
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/* |
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* Revision number is auto-incremented whenever this file is changed |
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* (See FILL_VMSTOR_REVISION macro above). Mismatch does not |
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* definitely indicate incompatibility--but it does indicate mismatched |
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* builds. |
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* This is only used on the windows side. Just set it to 0. |
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*/ |
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u16 revision; |
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} __packed; |
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|
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/* Channel Property Flags */ |
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#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 |
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#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 |
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|
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struct vstor_packet { |
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/* Requested operation type */ |
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enum vstor_packet_operation operation; |
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|
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/* Flags - see below for values */ |
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u32 flags; |
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|
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/* Status of the request returned from the server side. */ |
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u32 status; |
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|
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/* Data payload area */ |
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union { |
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/* |
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* Structure used to forward SCSI commands from the |
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* client to the server. |
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*/ |
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struct vmscsi_request vm_srb; |
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|
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/* Structure used to query channel properties. */ |
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struct vmstorage_channel_properties storage_channel_properties; |
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|
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/* Used during version negotiations. */ |
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struct vmstorage_protocol_version version; |
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|
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/* Fibre channel address packet */ |
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struct hv_fc_wwn_packet wwn_packet; |
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|
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/* Number of sub-channels to create */ |
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u16 sub_channel_count; |
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|
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/* This will be the maximum of the union members */ |
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u8 buffer[0x34]; |
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}; |
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} __packed; |
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|
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/* |
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* Packet Flags: |
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* |
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* This flag indicates that the server should send back a completion for this |
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* packet. |
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*/ |
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|
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#define REQUEST_COMPLETION_FLAG 0x1 |
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|
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/* Matches Windows-end */ |
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enum storvsc_request_type { |
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WRITE_TYPE = 0, |
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READ_TYPE, |
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UNKNOWN_TYPE, |
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}; |
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|
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/* |
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* SRB status codes and masks; a subset of the codes used here. |
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*/ |
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|
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#define SRB_STATUS_AUTOSENSE_VALID 0x80 |
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#define SRB_STATUS_QUEUE_FROZEN 0x40 |
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#define SRB_STATUS_INVALID_LUN 0x20 |
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#define SRB_STATUS_SUCCESS 0x01 |
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#define SRB_STATUS_ABORTED 0x02 |
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#define SRB_STATUS_ERROR 0x04 |
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#define SRB_STATUS_DATA_OVERRUN 0x12 |
|
|
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#define SRB_STATUS(status) \ |
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(status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) |
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/* |
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* This is the end of Protocol specific defines. |
|
*/ |
|
|
|
static int storvsc_ringbuffer_size = (128 * 1024); |
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static u32 max_outstanding_req_per_channel; |
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static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth); |
|
|
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static int storvsc_vcpus_per_sub_channel = 4; |
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static unsigned int storvsc_max_hw_queues; |
|
|
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module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
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MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); |
|
|
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module_param(storvsc_max_hw_queues, uint, 0644); |
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MODULE_PARM_DESC(storvsc_max_hw_queues, "Maximum number of hardware queues"); |
|
|
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module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); |
|
MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); |
|
|
|
static int ring_avail_percent_lowater = 10; |
|
module_param(ring_avail_percent_lowater, int, S_IRUGO); |
|
MODULE_PARM_DESC(ring_avail_percent_lowater, |
|
"Select a channel if available ring size > this in percent"); |
|
|
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/* |
|
* Timeout in seconds for all devices managed by this driver. |
|
*/ |
|
static int storvsc_timeout = 180; |
|
|
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
static struct scsi_transport_template *fc_transport_template; |
|
#endif |
|
|
|
static struct scsi_host_template scsi_driver; |
|
static void storvsc_on_channel_callback(void *context); |
|
|
|
#define STORVSC_MAX_LUNS_PER_TARGET 255 |
|
#define STORVSC_MAX_TARGETS 2 |
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#define STORVSC_MAX_CHANNELS 8 |
|
|
|
#define STORVSC_FC_MAX_LUNS_PER_TARGET 255 |
|
#define STORVSC_FC_MAX_TARGETS 128 |
|
#define STORVSC_FC_MAX_CHANNELS 8 |
|
|
|
#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 |
|
#define STORVSC_IDE_MAX_TARGETS 1 |
|
#define STORVSC_IDE_MAX_CHANNELS 1 |
|
|
|
/* |
|
* Upper bound on the size of a storvsc packet. vmscsi_size_delta is not |
|
* included in the calculation because it is set after STORVSC_MAX_PKT_SIZE |
|
* is used in storvsc_connect_to_vsp |
|
*/ |
|
#define STORVSC_MAX_PKT_SIZE (sizeof(struct vmpacket_descriptor) +\ |
|
sizeof(struct vstor_packet)) |
|
|
|
struct storvsc_cmd_request { |
|
struct scsi_cmnd *cmd; |
|
|
|
struct hv_device *device; |
|
|
|
/* Synchronize the request/response if needed */ |
|
struct completion wait_event; |
|
|
|
struct vmbus_channel_packet_multipage_buffer mpb; |
|
struct vmbus_packet_mpb_array *payload; |
|
u32 payload_sz; |
|
|
|
struct vstor_packet vstor_packet; |
|
}; |
|
|
|
|
|
/* A storvsc device is a device object that contains a vmbus channel */ |
|
struct storvsc_device { |
|
struct hv_device *device; |
|
|
|
bool destroy; |
|
bool drain_notify; |
|
atomic_t num_outstanding_req; |
|
struct Scsi_Host *host; |
|
|
|
wait_queue_head_t waiting_to_drain; |
|
|
|
/* |
|
* Each unique Port/Path/Target represents 1 channel ie scsi |
|
* controller. In reality, the pathid, targetid is always 0 |
|
* and the port is set by us |
|
*/ |
|
unsigned int port_number; |
|
unsigned char path_id; |
|
unsigned char target_id; |
|
|
|
/* |
|
* The size of the vmscsi_request has changed in win8. The |
|
* additional size is because of new elements added to the |
|
* structure. These elements are valid only when we are talking |
|
* to a win8 host. |
|
* Track the correction to size we need to apply. This value |
|
* will likely change during protocol negotiation but it is |
|
* valid to start by assuming pre-Win8. |
|
*/ |
|
int vmscsi_size_delta; |
|
|
|
/* |
|
* Max I/O, the device can support. |
|
*/ |
|
u32 max_transfer_bytes; |
|
/* |
|
* Number of sub-channels we will open. |
|
*/ |
|
u16 num_sc; |
|
struct vmbus_channel **stor_chns; |
|
/* |
|
* Mask of CPUs bound to subchannels. |
|
*/ |
|
struct cpumask alloced_cpus; |
|
/* |
|
* Serializes modifications of stor_chns[] from storvsc_do_io() |
|
* and storvsc_change_target_cpu(). |
|
*/ |
|
spinlock_t lock; |
|
/* Used for vsc/vsp channel reset process */ |
|
struct storvsc_cmd_request init_request; |
|
struct storvsc_cmd_request reset_request; |
|
/* |
|
* Currently active port and node names for FC devices. |
|
*/ |
|
u64 node_name; |
|
u64 port_name; |
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
struct fc_rport *rport; |
|
#endif |
|
}; |
|
|
|
struct hv_host_device { |
|
struct hv_device *dev; |
|
unsigned int port; |
|
unsigned char path; |
|
unsigned char target; |
|
struct workqueue_struct *handle_error_wq; |
|
struct work_struct host_scan_work; |
|
struct Scsi_Host *host; |
|
}; |
|
|
|
struct storvsc_scan_work { |
|
struct work_struct work; |
|
struct Scsi_Host *host; |
|
u8 lun; |
|
u8 tgt_id; |
|
}; |
|
|
|
static void storvsc_device_scan(struct work_struct *work) |
|
{ |
|
struct storvsc_scan_work *wrk; |
|
struct scsi_device *sdev; |
|
|
|
wrk = container_of(work, struct storvsc_scan_work, work); |
|
|
|
sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
|
if (!sdev) |
|
goto done; |
|
scsi_rescan_device(&sdev->sdev_gendev); |
|
scsi_device_put(sdev); |
|
|
|
done: |
|
kfree(wrk); |
|
} |
|
|
|
static void storvsc_host_scan(struct work_struct *work) |
|
{ |
|
struct Scsi_Host *host; |
|
struct scsi_device *sdev; |
|
struct hv_host_device *host_device = |
|
container_of(work, struct hv_host_device, host_scan_work); |
|
|
|
host = host_device->host; |
|
/* |
|
* Before scanning the host, first check to see if any of the |
|
* currrently known devices have been hot removed. We issue a |
|
* "unit ready" command against all currently known devices. |
|
* This I/O will result in an error for devices that have been |
|
* removed. As part of handling the I/O error, we remove the device. |
|
* |
|
* When a LUN is added or removed, the host sends us a signal to |
|
* scan the host. Thus we are forced to discover the LUNs that |
|
* may have been removed this way. |
|
*/ |
|
mutex_lock(&host->scan_mutex); |
|
shost_for_each_device(sdev, host) |
|
scsi_test_unit_ready(sdev, 1, 1, NULL); |
|
mutex_unlock(&host->scan_mutex); |
|
/* |
|
* Now scan the host to discover LUNs that may have been added. |
|
*/ |
|
scsi_scan_host(host); |
|
} |
|
|
|
static void storvsc_remove_lun(struct work_struct *work) |
|
{ |
|
struct storvsc_scan_work *wrk; |
|
struct scsi_device *sdev; |
|
|
|
wrk = container_of(work, struct storvsc_scan_work, work); |
|
if (!scsi_host_get(wrk->host)) |
|
goto done; |
|
|
|
sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); |
|
|
|
if (sdev) { |
|
scsi_remove_device(sdev); |
|
scsi_device_put(sdev); |
|
} |
|
scsi_host_put(wrk->host); |
|
|
|
done: |
|
kfree(wrk); |
|
} |
|
|
|
|
|
/* |
|
* We can get incoming messages from the host that are not in response to |
|
* messages that we have sent out. An example of this would be messages |
|
* received by the guest to notify dynamic addition/removal of LUNs. To |
|
* deal with potential race conditions where the driver may be in the |
|
* midst of being unloaded when we might receive an unsolicited message |
|
* from the host, we have implemented a mechanism to gurantee sequential |
|
* consistency: |
|
* |
|
* 1) Once the device is marked as being destroyed, we will fail all |
|
* outgoing messages. |
|
* 2) We permit incoming messages when the device is being destroyed, |
|
* only to properly account for messages already sent out. |
|
*/ |
|
|
|
static inline struct storvsc_device *get_out_stor_device( |
|
struct hv_device *device) |
|
{ |
|
struct storvsc_device *stor_device; |
|
|
|
stor_device = hv_get_drvdata(device); |
|
|
|
if (stor_device && stor_device->destroy) |
|
stor_device = NULL; |
|
|
|
return stor_device; |
|
} |
|
|
|
|
|
static inline void storvsc_wait_to_drain(struct storvsc_device *dev) |
|
{ |
|
dev->drain_notify = true; |
|
wait_event(dev->waiting_to_drain, |
|
atomic_read(&dev->num_outstanding_req) == 0); |
|
dev->drain_notify = false; |
|
} |
|
|
|
static inline struct storvsc_device *get_in_stor_device( |
|
struct hv_device *device) |
|
{ |
|
struct storvsc_device *stor_device; |
|
|
|
stor_device = hv_get_drvdata(device); |
|
|
|
if (!stor_device) |
|
goto get_in_err; |
|
|
|
/* |
|
* If the device is being destroyed; allow incoming |
|
* traffic only to cleanup outstanding requests. |
|
*/ |
|
|
|
if (stor_device->destroy && |
|
(atomic_read(&stor_device->num_outstanding_req) == 0)) |
|
stor_device = NULL; |
|
|
|
get_in_err: |
|
return stor_device; |
|
|
|
} |
|
|
|
static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old, |
|
u32 new) |
|
{ |
|
struct storvsc_device *stor_device; |
|
struct vmbus_channel *cur_chn; |
|
bool old_is_alloced = false; |
|
struct hv_device *device; |
|
unsigned long flags; |
|
int cpu; |
|
|
|
device = channel->primary_channel ? |
|
channel->primary_channel->device_obj |
|
: channel->device_obj; |
|
stor_device = get_out_stor_device(device); |
|
if (!stor_device) |
|
return; |
|
|
|
/* See storvsc_do_io() -> get_og_chn(). */ |
|
spin_lock_irqsave(&stor_device->lock, flags); |
|
|
|
/* |
|
* Determines if the storvsc device has other channels assigned to |
|
* the "old" CPU to update the alloced_cpus mask and the stor_chns |
|
* array. |
|
*/ |
|
if (device->channel != channel && device->channel->target_cpu == old) { |
|
cur_chn = device->channel; |
|
old_is_alloced = true; |
|
goto old_is_alloced; |
|
} |
|
list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) { |
|
if (cur_chn == channel) |
|
continue; |
|
if (cur_chn->target_cpu == old) { |
|
old_is_alloced = true; |
|
goto old_is_alloced; |
|
} |
|
} |
|
|
|
old_is_alloced: |
|
if (old_is_alloced) |
|
WRITE_ONCE(stor_device->stor_chns[old], cur_chn); |
|
else |
|
cpumask_clear_cpu(old, &stor_device->alloced_cpus); |
|
|
|
/* "Flush" the stor_chns array. */ |
|
for_each_possible_cpu(cpu) { |
|
if (stor_device->stor_chns[cpu] && !cpumask_test_cpu( |
|
cpu, &stor_device->alloced_cpus)) |
|
WRITE_ONCE(stor_device->stor_chns[cpu], NULL); |
|
} |
|
|
|
WRITE_ONCE(stor_device->stor_chns[new], channel); |
|
cpumask_set_cpu(new, &stor_device->alloced_cpus); |
|
|
|
spin_unlock_irqrestore(&stor_device->lock, flags); |
|
} |
|
|
|
static u64 storvsc_next_request_id(struct vmbus_channel *channel, u64 rqst_addr) |
|
{ |
|
struct storvsc_cmd_request *request = |
|
(struct storvsc_cmd_request *)(unsigned long)rqst_addr; |
|
|
|
if (rqst_addr == VMBUS_RQST_INIT) |
|
return VMBUS_RQST_INIT; |
|
if (rqst_addr == VMBUS_RQST_RESET) |
|
return VMBUS_RQST_RESET; |
|
|
|
/* |
|
* Cannot return an ID of 0, which is reserved for an unsolicited |
|
* message from Hyper-V. |
|
*/ |
|
return (u64)blk_mq_unique_tag(scsi_cmd_to_rq(request->cmd)) + 1; |
|
} |
|
|
|
static void handle_sc_creation(struct vmbus_channel *new_sc) |
|
{ |
|
struct hv_device *device = new_sc->primary_channel->device_obj; |
|
struct device *dev = &device->device; |
|
struct storvsc_device *stor_device; |
|
struct vmstorage_channel_properties props; |
|
int ret; |
|
|
|
stor_device = get_out_stor_device(device); |
|
if (!stor_device) |
|
return; |
|
|
|
memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
|
new_sc->max_pkt_size = STORVSC_MAX_PKT_SIZE; |
|
|
|
new_sc->next_request_id_callback = storvsc_next_request_id; |
|
|
|
ret = vmbus_open(new_sc, |
|
storvsc_ringbuffer_size, |
|
storvsc_ringbuffer_size, |
|
(void *)&props, |
|
sizeof(struct vmstorage_channel_properties), |
|
storvsc_on_channel_callback, new_sc); |
|
|
|
/* In case vmbus_open() fails, we don't use the sub-channel. */ |
|
if (ret != 0) { |
|
dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); |
|
return; |
|
} |
|
|
|
new_sc->change_target_cpu_callback = storvsc_change_target_cpu; |
|
|
|
/* Add the sub-channel to the array of available channels. */ |
|
stor_device->stor_chns[new_sc->target_cpu] = new_sc; |
|
cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); |
|
} |
|
|
|
static void handle_multichannel_storage(struct hv_device *device, int max_chns) |
|
{ |
|
struct device *dev = &device->device; |
|
struct storvsc_device *stor_device; |
|
int num_sc; |
|
struct storvsc_cmd_request *request; |
|
struct vstor_packet *vstor_packet; |
|
int ret, t; |
|
|
|
/* |
|
* If the number of CPUs is artificially restricted, such as |
|
* with maxcpus=1 on the kernel boot line, Hyper-V could offer |
|
* sub-channels >= the number of CPUs. These sub-channels |
|
* should not be created. The primary channel is already created |
|
* and assigned to one CPU, so check against # CPUs - 1. |
|
*/ |
|
num_sc = min((int)(num_online_cpus() - 1), max_chns); |
|
if (!num_sc) |
|
return; |
|
|
|
stor_device = get_out_stor_device(device); |
|
if (!stor_device) |
|
return; |
|
|
|
stor_device->num_sc = num_sc; |
|
request = &stor_device->init_request; |
|
vstor_packet = &request->vstor_packet; |
|
|
|
/* |
|
* Establish a handler for dealing with subchannels. |
|
*/ |
|
vmbus_set_sc_create_callback(device->channel, handle_sc_creation); |
|
|
|
/* |
|
* Request the host to create sub-channels. |
|
*/ |
|
memset(request, 0, sizeof(struct storvsc_cmd_request)); |
|
init_completion(&request->wait_event); |
|
vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; |
|
vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
|
vstor_packet->sub_channel_count = num_sc; |
|
|
|
ret = vmbus_sendpacket(device->channel, vstor_packet, |
|
(sizeof(struct vstor_packet) - |
|
stor_device->vmscsi_size_delta), |
|
VMBUS_RQST_INIT, |
|
VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
|
|
if (ret != 0) { |
|
dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); |
|
return; |
|
} |
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 10*HZ); |
|
if (t == 0) { |
|
dev_err(dev, "Failed to create sub-channel: timed out\n"); |
|
return; |
|
} |
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
|
vstor_packet->status != 0) { |
|
dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", |
|
vstor_packet->operation, vstor_packet->status); |
|
return; |
|
} |
|
|
|
/* |
|
* We need to do nothing here, because vmbus_process_offer() |
|
* invokes channel->sc_creation_callback, which will open and use |
|
* the sub-channel(s). |
|
*/ |
|
} |
|
|
|
static void cache_wwn(struct storvsc_device *stor_device, |
|
struct vstor_packet *vstor_packet) |
|
{ |
|
/* |
|
* Cache the currently active port and node ww names. |
|
*/ |
|
if (vstor_packet->wwn_packet.primary_active) { |
|
stor_device->node_name = |
|
wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); |
|
stor_device->port_name = |
|
wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); |
|
} else { |
|
stor_device->node_name = |
|
wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); |
|
stor_device->port_name = |
|
wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); |
|
} |
|
} |
|
|
|
|
|
static int storvsc_execute_vstor_op(struct hv_device *device, |
|
struct storvsc_cmd_request *request, |
|
bool status_check) |
|
{ |
|
struct storvsc_device *stor_device; |
|
struct vstor_packet *vstor_packet; |
|
int ret, t; |
|
|
|
stor_device = get_out_stor_device(device); |
|
if (!stor_device) |
|
return -ENODEV; |
|
|
|
vstor_packet = &request->vstor_packet; |
|
|
|
init_completion(&request->wait_event); |
|
vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
|
|
|
ret = vmbus_sendpacket(device->channel, vstor_packet, |
|
(sizeof(struct vstor_packet) - |
|
stor_device->vmscsi_size_delta), |
|
VMBUS_RQST_INIT, |
|
VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
if (ret != 0) |
|
return ret; |
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
|
if (t == 0) |
|
return -ETIMEDOUT; |
|
|
|
if (!status_check) |
|
return ret; |
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
|
vstor_packet->status != 0) |
|
return -EINVAL; |
|
|
|
return ret; |
|
} |
|
|
|
static int storvsc_channel_init(struct hv_device *device, bool is_fc) |
|
{ |
|
struct storvsc_device *stor_device; |
|
struct storvsc_cmd_request *request; |
|
struct vstor_packet *vstor_packet; |
|
int ret, i; |
|
int max_chns; |
|
bool process_sub_channels = false; |
|
|
|
stor_device = get_out_stor_device(device); |
|
if (!stor_device) |
|
return -ENODEV; |
|
|
|
request = &stor_device->init_request; |
|
vstor_packet = &request->vstor_packet; |
|
|
|
/* |
|
* Now, initiate the vsc/vsp initialization protocol on the open |
|
* channel |
|
*/ |
|
memset(request, 0, sizeof(struct storvsc_cmd_request)); |
|
vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; |
|
ret = storvsc_execute_vstor_op(device, request, true); |
|
if (ret) |
|
return ret; |
|
/* |
|
* Query host supported protocol version. |
|
*/ |
|
|
|
for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { |
|
/* reuse the packet for version range supported */ |
|
memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
|
vstor_packet->operation = |
|
VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; |
|
|
|
vstor_packet->version.major_minor = |
|
vmstor_protocols[i].protocol_version; |
|
|
|
/* |
|
* The revision number is only used in Windows; set it to 0. |
|
*/ |
|
vstor_packet->version.revision = 0; |
|
ret = storvsc_execute_vstor_op(device, request, false); |
|
if (ret != 0) |
|
return ret; |
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) |
|
return -EINVAL; |
|
|
|
if (vstor_packet->status == 0) { |
|
vmstor_proto_version = |
|
vmstor_protocols[i].protocol_version; |
|
|
|
sense_buffer_size = |
|
vmstor_protocols[i].sense_buffer_size; |
|
|
|
stor_device->vmscsi_size_delta = |
|
vmstor_protocols[i].vmscsi_size_delta; |
|
|
|
break; |
|
} |
|
} |
|
|
|
if (vstor_packet->status != 0) |
|
return -EINVAL; |
|
|
|
|
|
memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
|
vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; |
|
ret = storvsc_execute_vstor_op(device, request, true); |
|
if (ret != 0) |
|
return ret; |
|
|
|
/* |
|
* Check to see if multi-channel support is there. |
|
* Hosts that implement protocol version of 5.1 and above |
|
* support multi-channel. |
|
*/ |
|
max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; |
|
|
|
/* |
|
* Allocate state to manage the sub-channels. |
|
* We allocate an array based on the numbers of possible CPUs |
|
* (Hyper-V does not support cpu online/offline). |
|
* This Array will be sparseley populated with unique |
|
* channels - primary + sub-channels. |
|
* We will however populate all the slots to evenly distribute |
|
* the load. |
|
*/ |
|
stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), |
|
GFP_KERNEL); |
|
if (stor_device->stor_chns == NULL) |
|
return -ENOMEM; |
|
|
|
device->channel->change_target_cpu_callback = storvsc_change_target_cpu; |
|
|
|
stor_device->stor_chns[device->channel->target_cpu] = device->channel; |
|
cpumask_set_cpu(device->channel->target_cpu, |
|
&stor_device->alloced_cpus); |
|
|
|
if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { |
|
if (vstor_packet->storage_channel_properties.flags & |
|
STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) |
|
process_sub_channels = true; |
|
} |
|
stor_device->max_transfer_bytes = |
|
vstor_packet->storage_channel_properties.max_transfer_bytes; |
|
|
|
if (!is_fc) |
|
goto done; |
|
|
|
/* |
|
* For FC devices retrieve FC HBA data. |
|
*/ |
|
memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
|
vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; |
|
ret = storvsc_execute_vstor_op(device, request, true); |
|
if (ret != 0) |
|
return ret; |
|
|
|
/* |
|
* Cache the currently active port and node ww names. |
|
*/ |
|
cache_wwn(stor_device, vstor_packet); |
|
|
|
done: |
|
|
|
memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
|
vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; |
|
ret = storvsc_execute_vstor_op(device, request, true); |
|
if (ret != 0) |
|
return ret; |
|
|
|
if (process_sub_channels) |
|
handle_multichannel_storage(device, max_chns); |
|
|
|
return ret; |
|
} |
|
|
|
static void storvsc_handle_error(struct vmscsi_request *vm_srb, |
|
struct scsi_cmnd *scmnd, |
|
struct Scsi_Host *host, |
|
u8 asc, u8 ascq) |
|
{ |
|
struct storvsc_scan_work *wrk; |
|
void (*process_err_fn)(struct work_struct *work); |
|
struct hv_host_device *host_dev = shost_priv(host); |
|
|
|
/* |
|
* In some situations, Hyper-V sets multiple bits in the |
|
* srb_status, such as ABORTED and ERROR. So process them |
|
* individually, with the most specific bits first. |
|
*/ |
|
|
|
if (vm_srb->srb_status & SRB_STATUS_INVALID_LUN) { |
|
set_host_byte(scmnd, DID_NO_CONNECT); |
|
process_err_fn = storvsc_remove_lun; |
|
goto do_work; |
|
} |
|
|
|
if (vm_srb->srb_status & SRB_STATUS_ABORTED) { |
|
if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && |
|
/* Capacity data has changed */ |
|
(asc == 0x2a) && (ascq == 0x9)) { |
|
process_err_fn = storvsc_device_scan; |
|
/* |
|
* Retry the I/O that triggered this. |
|
*/ |
|
set_host_byte(scmnd, DID_REQUEUE); |
|
goto do_work; |
|
} |
|
} |
|
|
|
if (vm_srb->srb_status & SRB_STATUS_ERROR) { |
|
/* |
|
* Let upper layer deal with error when |
|
* sense message is present. |
|
*/ |
|
if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) |
|
return; |
|
|
|
/* |
|
* If there is an error; offline the device since all |
|
* error recovery strategies would have already been |
|
* deployed on the host side. However, if the command |
|
* were a pass-through command deal with it appropriately. |
|
*/ |
|
switch (scmnd->cmnd[0]) { |
|
case ATA_16: |
|
case ATA_12: |
|
set_host_byte(scmnd, DID_PASSTHROUGH); |
|
break; |
|
/* |
|
* On some Hyper-V hosts TEST_UNIT_READY command can |
|
* return SRB_STATUS_ERROR. Let the upper level code |
|
* deal with it based on the sense information. |
|
*/ |
|
case TEST_UNIT_READY: |
|
break; |
|
default: |
|
set_host_byte(scmnd, DID_ERROR); |
|
} |
|
} |
|
return; |
|
|
|
do_work: |
|
/* |
|
* We need to schedule work to process this error; schedule it. |
|
*/ |
|
wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); |
|
if (!wrk) { |
|
set_host_byte(scmnd, DID_TARGET_FAILURE); |
|
return; |
|
} |
|
|
|
wrk->host = host; |
|
wrk->lun = vm_srb->lun; |
|
wrk->tgt_id = vm_srb->target_id; |
|
INIT_WORK(&wrk->work, process_err_fn); |
|
queue_work(host_dev->handle_error_wq, &wrk->work); |
|
} |
|
|
|
|
|
static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, |
|
struct storvsc_device *stor_dev) |
|
{ |
|
struct scsi_cmnd *scmnd = cmd_request->cmd; |
|
struct scsi_sense_hdr sense_hdr; |
|
struct vmscsi_request *vm_srb; |
|
u32 data_transfer_length; |
|
struct Scsi_Host *host; |
|
u32 payload_sz = cmd_request->payload_sz; |
|
void *payload = cmd_request->payload; |
|
bool sense_ok; |
|
|
|
host = stor_dev->host; |
|
|
|
vm_srb = &cmd_request->vstor_packet.vm_srb; |
|
data_transfer_length = vm_srb->data_transfer_length; |
|
|
|
scmnd->result = vm_srb->scsi_status; |
|
|
|
if (scmnd->result) { |
|
sense_ok = scsi_normalize_sense(scmnd->sense_buffer, |
|
SCSI_SENSE_BUFFERSIZE, &sense_hdr); |
|
|
|
if (sense_ok && do_logging(STORVSC_LOGGING_WARN)) |
|
scsi_print_sense_hdr(scmnd->device, "storvsc", |
|
&sense_hdr); |
|
} |
|
|
|
if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { |
|
storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, |
|
sense_hdr.ascq); |
|
/* |
|
* The Windows driver set data_transfer_length on |
|
* SRB_STATUS_DATA_OVERRUN. On other errors, this value |
|
* is untouched. In these cases we set it to 0. |
|
*/ |
|
if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) |
|
data_transfer_length = 0; |
|
} |
|
|
|
/* Validate data_transfer_length (from Hyper-V) */ |
|
if (data_transfer_length > cmd_request->payload->range.len) |
|
data_transfer_length = cmd_request->payload->range.len; |
|
|
|
scsi_set_resid(scmnd, |
|
cmd_request->payload->range.len - data_transfer_length); |
|
|
|
scmnd->scsi_done(scmnd); |
|
|
|
if (payload_sz > |
|
sizeof(struct vmbus_channel_packet_multipage_buffer)) |
|
kfree(payload); |
|
} |
|
|
|
static void storvsc_on_io_completion(struct storvsc_device *stor_device, |
|
struct vstor_packet *vstor_packet, |
|
struct storvsc_cmd_request *request) |
|
{ |
|
struct vstor_packet *stor_pkt; |
|
struct hv_device *device = stor_device->device; |
|
|
|
stor_pkt = &request->vstor_packet; |
|
|
|
/* |
|
* The current SCSI handling on the host side does |
|
* not correctly handle: |
|
* INQUIRY command with page code parameter set to 0x80 |
|
* MODE_SENSE command with cmd[2] == 0x1c |
|
* |
|
* Setup srb and scsi status so this won't be fatal. |
|
* We do this so we can distinguish truly fatal failues |
|
* (srb status == 0x4) and off-line the device in that case. |
|
*/ |
|
|
|
if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || |
|
(stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { |
|
vstor_packet->vm_srb.scsi_status = 0; |
|
vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; |
|
} |
|
|
|
/* Copy over the status...etc */ |
|
stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; |
|
stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; |
|
|
|
/* |
|
* Copy over the sense_info_length, but limit to the known max |
|
* size if Hyper-V returns a bad value. |
|
*/ |
|
stor_pkt->vm_srb.sense_info_length = min_t(u8, sense_buffer_size, |
|
vstor_packet->vm_srb.sense_info_length); |
|
|
|
if (vstor_packet->vm_srb.scsi_status != 0 || |
|
vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) { |
|
|
|
/* |
|
* Log TEST_UNIT_READY errors only as warnings. Hyper-V can |
|
* return errors when detecting devices using TEST_UNIT_READY, |
|
* and logging these as errors produces unhelpful noise. |
|
*/ |
|
int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ? |
|
STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR; |
|
|
|
storvsc_log(device, loglevel, |
|
"tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", |
|
scsi_cmd_to_rq(request->cmd)->tag, |
|
stor_pkt->vm_srb.cdb[0], |
|
vstor_packet->vm_srb.scsi_status, |
|
vstor_packet->vm_srb.srb_status, |
|
vstor_packet->status); |
|
} |
|
|
|
if (vstor_packet->vm_srb.scsi_status == SAM_STAT_CHECK_CONDITION && |
|
(vstor_packet->vm_srb.srb_status & SRB_STATUS_AUTOSENSE_VALID)) |
|
memcpy(request->cmd->sense_buffer, |
|
vstor_packet->vm_srb.sense_data, |
|
stor_pkt->vm_srb.sense_info_length); |
|
|
|
stor_pkt->vm_srb.data_transfer_length = |
|
vstor_packet->vm_srb.data_transfer_length; |
|
|
|
storvsc_command_completion(request, stor_device); |
|
|
|
if (atomic_dec_and_test(&stor_device->num_outstanding_req) && |
|
stor_device->drain_notify) |
|
wake_up(&stor_device->waiting_to_drain); |
|
} |
|
|
|
static void storvsc_on_receive(struct storvsc_device *stor_device, |
|
struct vstor_packet *vstor_packet, |
|
struct storvsc_cmd_request *request) |
|
{ |
|
struct hv_host_device *host_dev; |
|
switch (vstor_packet->operation) { |
|
case VSTOR_OPERATION_COMPLETE_IO: |
|
storvsc_on_io_completion(stor_device, vstor_packet, request); |
|
break; |
|
|
|
case VSTOR_OPERATION_REMOVE_DEVICE: |
|
case VSTOR_OPERATION_ENUMERATE_BUS: |
|
host_dev = shost_priv(stor_device->host); |
|
queue_work( |
|
host_dev->handle_error_wq, &host_dev->host_scan_work); |
|
break; |
|
|
|
case VSTOR_OPERATION_FCHBA_DATA: |
|
cache_wwn(stor_device, vstor_packet); |
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
fc_host_node_name(stor_device->host) = stor_device->node_name; |
|
fc_host_port_name(stor_device->host) = stor_device->port_name; |
|
#endif |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
static void storvsc_on_channel_callback(void *context) |
|
{ |
|
struct vmbus_channel *channel = (struct vmbus_channel *)context; |
|
const struct vmpacket_descriptor *desc; |
|
struct hv_device *device; |
|
struct storvsc_device *stor_device; |
|
struct Scsi_Host *shost; |
|
|
|
if (channel->primary_channel != NULL) |
|
device = channel->primary_channel->device_obj; |
|
else |
|
device = channel->device_obj; |
|
|
|
stor_device = get_in_stor_device(device); |
|
if (!stor_device) |
|
return; |
|
|
|
shost = stor_device->host; |
|
|
|
foreach_vmbus_pkt(desc, channel) { |
|
struct vstor_packet *packet = hv_pkt_data(desc); |
|
struct storvsc_cmd_request *request = NULL; |
|
u64 rqst_id = desc->trans_id; |
|
|
|
if (hv_pkt_datalen(desc) < sizeof(struct vstor_packet) - |
|
stor_device->vmscsi_size_delta) { |
|
dev_err(&device->device, "Invalid packet len\n"); |
|
continue; |
|
} |
|
|
|
if (rqst_id == VMBUS_RQST_INIT) { |
|
request = &stor_device->init_request; |
|
} else if (rqst_id == VMBUS_RQST_RESET) { |
|
request = &stor_device->reset_request; |
|
} else { |
|
/* Hyper-V can send an unsolicited message with ID of 0 */ |
|
if (rqst_id == 0) { |
|
/* |
|
* storvsc_on_receive() looks at the vstor_packet in the message |
|
* from the ring buffer. If the operation in the vstor_packet is |
|
* COMPLETE_IO, then we call storvsc_on_io_completion(), and |
|
* dereference the guest memory address. Make sure we don't call |
|
* storvsc_on_io_completion() with a guest memory address that is |
|
* zero if Hyper-V were to construct and send such a bogus packet. |
|
*/ |
|
if (packet->operation == VSTOR_OPERATION_COMPLETE_IO) { |
|
dev_err(&device->device, "Invalid packet with ID of 0\n"); |
|
continue; |
|
} |
|
} else { |
|
struct scsi_cmnd *scmnd; |
|
|
|
/* Transaction 'rqst_id' corresponds to tag 'rqst_id - 1' */ |
|
scmnd = scsi_host_find_tag(shost, rqst_id - 1); |
|
if (scmnd == NULL) { |
|
dev_err(&device->device, "Incorrect transaction ID\n"); |
|
continue; |
|
} |
|
request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd); |
|
} |
|
|
|
storvsc_on_receive(stor_device, packet, request); |
|
continue; |
|
} |
|
|
|
memcpy(&request->vstor_packet, packet, |
|
(sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta)); |
|
complete(&request->wait_event); |
|
} |
|
} |
|
|
|
static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, |
|
bool is_fc) |
|
{ |
|
struct vmstorage_channel_properties props; |
|
int ret; |
|
|
|
memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
|
|
|
device->channel->max_pkt_size = STORVSC_MAX_PKT_SIZE; |
|
device->channel->next_request_id_callback = storvsc_next_request_id; |
|
|
|
ret = vmbus_open(device->channel, |
|
ring_size, |
|
ring_size, |
|
(void *)&props, |
|
sizeof(struct vmstorage_channel_properties), |
|
storvsc_on_channel_callback, device->channel); |
|
|
|
if (ret != 0) |
|
return ret; |
|
|
|
ret = storvsc_channel_init(device, is_fc); |
|
|
|
return ret; |
|
} |
|
|
|
static int storvsc_dev_remove(struct hv_device *device) |
|
{ |
|
struct storvsc_device *stor_device; |
|
|
|
stor_device = hv_get_drvdata(device); |
|
|
|
stor_device->destroy = true; |
|
|
|
/* Make sure flag is set before waiting */ |
|
wmb(); |
|
|
|
/* |
|
* At this point, all outbound traffic should be disable. We |
|
* only allow inbound traffic (responses) to proceed so that |
|
* outstanding requests can be completed. |
|
*/ |
|
|
|
storvsc_wait_to_drain(stor_device); |
|
|
|
/* |
|
* Since we have already drained, we don't need to busy wait |
|
* as was done in final_release_stor_device() |
|
* Note that we cannot set the ext pointer to NULL until |
|
* we have drained - to drain the outgoing packets, we need to |
|
* allow incoming packets. |
|
*/ |
|
hv_set_drvdata(device, NULL); |
|
|
|
/* Close the channel */ |
|
vmbus_close(device->channel); |
|
|
|
kfree(stor_device->stor_chns); |
|
kfree(stor_device); |
|
return 0; |
|
} |
|
|
|
static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, |
|
u16 q_num) |
|
{ |
|
u16 slot = 0; |
|
u16 hash_qnum; |
|
const struct cpumask *node_mask; |
|
int num_channels, tgt_cpu; |
|
|
|
if (stor_device->num_sc == 0) { |
|
stor_device->stor_chns[q_num] = stor_device->device->channel; |
|
return stor_device->device->channel; |
|
} |
|
|
|
/* |
|
* Our channel array is sparsley populated and we |
|
* initiated I/O on a processor/hw-q that does not |
|
* currently have a designated channel. Fix this. |
|
* The strategy is simple: |
|
* I. Ensure NUMA locality |
|
* II. Distribute evenly (best effort) |
|
*/ |
|
|
|
node_mask = cpumask_of_node(cpu_to_node(q_num)); |
|
|
|
num_channels = 0; |
|
for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
|
if (cpumask_test_cpu(tgt_cpu, node_mask)) |
|
num_channels++; |
|
} |
|
if (num_channels == 0) { |
|
stor_device->stor_chns[q_num] = stor_device->device->channel; |
|
return stor_device->device->channel; |
|
} |
|
|
|
hash_qnum = q_num; |
|
while (hash_qnum >= num_channels) |
|
hash_qnum -= num_channels; |
|
|
|
for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
|
if (!cpumask_test_cpu(tgt_cpu, node_mask)) |
|
continue; |
|
if (slot == hash_qnum) |
|
break; |
|
slot++; |
|
} |
|
|
|
stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; |
|
|
|
return stor_device->stor_chns[q_num]; |
|
} |
|
|
|
|
|
static int storvsc_do_io(struct hv_device *device, |
|
struct storvsc_cmd_request *request, u16 q_num) |
|
{ |
|
struct storvsc_device *stor_device; |
|
struct vstor_packet *vstor_packet; |
|
struct vmbus_channel *outgoing_channel, *channel; |
|
unsigned long flags; |
|
int ret = 0; |
|
const struct cpumask *node_mask; |
|
int tgt_cpu; |
|
|
|
vstor_packet = &request->vstor_packet; |
|
stor_device = get_out_stor_device(device); |
|
|
|
if (!stor_device) |
|
return -ENODEV; |
|
|
|
|
|
request->device = device; |
|
/* |
|
* Select an appropriate channel to send the request out. |
|
*/ |
|
/* See storvsc_change_target_cpu(). */ |
|
outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); |
|
if (outgoing_channel != NULL) { |
|
if (outgoing_channel->target_cpu == q_num) { |
|
/* |
|
* Ideally, we want to pick a different channel if |
|
* available on the same NUMA node. |
|
*/ |
|
node_mask = cpumask_of_node(cpu_to_node(q_num)); |
|
for_each_cpu_wrap(tgt_cpu, |
|
&stor_device->alloced_cpus, q_num + 1) { |
|
if (!cpumask_test_cpu(tgt_cpu, node_mask)) |
|
continue; |
|
if (tgt_cpu == q_num) |
|
continue; |
|
channel = READ_ONCE( |
|
stor_device->stor_chns[tgt_cpu]); |
|
if (channel == NULL) |
|
continue; |
|
if (hv_get_avail_to_write_percent( |
|
&channel->outbound) |
|
> ring_avail_percent_lowater) { |
|
outgoing_channel = channel; |
|
goto found_channel; |
|
} |
|
} |
|
|
|
/* |
|
* All the other channels on the same NUMA node are |
|
* busy. Try to use the channel on the current CPU |
|
*/ |
|
if (hv_get_avail_to_write_percent( |
|
&outgoing_channel->outbound) |
|
> ring_avail_percent_lowater) |
|
goto found_channel; |
|
|
|
/* |
|
* If we reach here, all the channels on the current |
|
* NUMA node are busy. Try to find a channel in |
|
* other NUMA nodes |
|
*/ |
|
for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { |
|
if (cpumask_test_cpu(tgt_cpu, node_mask)) |
|
continue; |
|
channel = READ_ONCE( |
|
stor_device->stor_chns[tgt_cpu]); |
|
if (channel == NULL) |
|
continue; |
|
if (hv_get_avail_to_write_percent( |
|
&channel->outbound) |
|
> ring_avail_percent_lowater) { |
|
outgoing_channel = channel; |
|
goto found_channel; |
|
} |
|
} |
|
} |
|
} else { |
|
spin_lock_irqsave(&stor_device->lock, flags); |
|
outgoing_channel = stor_device->stor_chns[q_num]; |
|
if (outgoing_channel != NULL) { |
|
spin_unlock_irqrestore(&stor_device->lock, flags); |
|
goto found_channel; |
|
} |
|
outgoing_channel = get_og_chn(stor_device, q_num); |
|
spin_unlock_irqrestore(&stor_device->lock, flags); |
|
} |
|
|
|
found_channel: |
|
vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
|
|
|
vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - |
|
stor_device->vmscsi_size_delta); |
|
|
|
|
|
vstor_packet->vm_srb.sense_info_length = sense_buffer_size; |
|
|
|
|
|
vstor_packet->vm_srb.data_transfer_length = |
|
request->payload->range.len; |
|
|
|
vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; |
|
|
|
if (request->payload->range.len) { |
|
|
|
ret = vmbus_sendpacket_mpb_desc(outgoing_channel, |
|
request->payload, request->payload_sz, |
|
vstor_packet, |
|
(sizeof(struct vstor_packet) - |
|
stor_device->vmscsi_size_delta), |
|
(unsigned long)request); |
|
} else { |
|
ret = vmbus_sendpacket(outgoing_channel, vstor_packet, |
|
(sizeof(struct vstor_packet) - |
|
stor_device->vmscsi_size_delta), |
|
(unsigned long)request, |
|
VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
} |
|
|
|
if (ret != 0) |
|
return ret; |
|
|
|
atomic_inc(&stor_device->num_outstanding_req); |
|
|
|
return ret; |
|
} |
|
|
|
static int storvsc_device_alloc(struct scsi_device *sdevice) |
|
{ |
|
/* |
|
* Set blist flag to permit the reading of the VPD pages even when |
|
* the target may claim SPC-2 compliance. MSFT targets currently |
|
* claim SPC-2 compliance while they implement post SPC-2 features. |
|
* With this flag we can correctly handle WRITE_SAME_16 issues. |
|
* |
|
* Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but |
|
* still supports REPORT LUN. |
|
*/ |
|
sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; |
|
|
|
return 0; |
|
} |
|
|
|
static int storvsc_device_configure(struct scsi_device *sdevice) |
|
{ |
|
blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); |
|
|
|
sdevice->no_write_same = 1; |
|
|
|
/* |
|
* If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 |
|
* if the device is a MSFT virtual device. If the host is |
|
* WIN10 or newer, allow write_same. |
|
*/ |
|
if (!strncmp(sdevice->vendor, "Msft", 4)) { |
|
switch (vmstor_proto_version) { |
|
case VMSTOR_PROTO_VERSION_WIN8: |
|
case VMSTOR_PROTO_VERSION_WIN8_1: |
|
sdevice->scsi_level = SCSI_SPC_3; |
|
break; |
|
} |
|
|
|
if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) |
|
sdevice->no_write_same = 0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, |
|
sector_t capacity, int *info) |
|
{ |
|
sector_t nsect = capacity; |
|
sector_t cylinders = nsect; |
|
int heads, sectors_pt; |
|
|
|
/* |
|
* We are making up these values; let us keep it simple. |
|
*/ |
|
heads = 0xff; |
|
sectors_pt = 0x3f; /* Sectors per track */ |
|
sector_div(cylinders, heads * sectors_pt); |
|
if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) |
|
cylinders = 0xffff; |
|
|
|
info[0] = heads; |
|
info[1] = sectors_pt; |
|
info[2] = (int)cylinders; |
|
|
|
return 0; |
|
} |
|
|
|
static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
|
{ |
|
struct hv_host_device *host_dev = shost_priv(scmnd->device->host); |
|
struct hv_device *device = host_dev->dev; |
|
|
|
struct storvsc_device *stor_device; |
|
struct storvsc_cmd_request *request; |
|
struct vstor_packet *vstor_packet; |
|
int ret, t; |
|
|
|
stor_device = get_out_stor_device(device); |
|
if (!stor_device) |
|
return FAILED; |
|
|
|
request = &stor_device->reset_request; |
|
vstor_packet = &request->vstor_packet; |
|
memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
|
|
|
init_completion(&request->wait_event); |
|
|
|
vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; |
|
vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
|
vstor_packet->vm_srb.path_id = stor_device->path_id; |
|
|
|
ret = vmbus_sendpacket(device->channel, vstor_packet, |
|
(sizeof(struct vstor_packet) - |
|
stor_device->vmscsi_size_delta), |
|
VMBUS_RQST_RESET, |
|
VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
if (ret != 0) |
|
return FAILED; |
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
|
if (t == 0) |
|
return TIMEOUT_ERROR; |
|
|
|
|
|
/* |
|
* At this point, all outstanding requests in the adapter |
|
* should have been flushed out and return to us |
|
* There is a potential race here where the host may be in |
|
* the process of responding when we return from here. |
|
* Just wait for all in-transit packets to be accounted for |
|
* before we return from here. |
|
*/ |
|
storvsc_wait_to_drain(stor_device); |
|
|
|
return SUCCESS; |
|
} |
|
|
|
/* |
|
* The host guarantees to respond to each command, although I/O latencies might |
|
* be unbounded on Azure. Reset the timer unconditionally to give the host a |
|
* chance to perform EH. |
|
*/ |
|
static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) |
|
{ |
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
if (scmnd->device->host->transportt == fc_transport_template) |
|
return fc_eh_timed_out(scmnd); |
|
#endif |
|
return BLK_EH_RESET_TIMER; |
|
} |
|
|
|
static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) |
|
{ |
|
bool allowed = true; |
|
u8 scsi_op = scmnd->cmnd[0]; |
|
|
|
switch (scsi_op) { |
|
/* the host does not handle WRITE_SAME, log accident usage */ |
|
case WRITE_SAME: |
|
/* |
|
* smartd sends this command and the host does not handle |
|
* this. So, don't send it. |
|
*/ |
|
case SET_WINDOW: |
|
set_host_byte(scmnd, DID_ERROR); |
|
allowed = false; |
|
break; |
|
default: |
|
break; |
|
} |
|
return allowed; |
|
} |
|
|
|
static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) |
|
{ |
|
int ret; |
|
struct hv_host_device *host_dev = shost_priv(host); |
|
struct hv_device *dev = host_dev->dev; |
|
struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); |
|
int i; |
|
struct scatterlist *sgl; |
|
unsigned int sg_count; |
|
struct vmscsi_request *vm_srb; |
|
struct vmbus_packet_mpb_array *payload; |
|
u32 payload_sz; |
|
u32 length; |
|
|
|
if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { |
|
/* |
|
* On legacy hosts filter unimplemented commands. |
|
* Future hosts are expected to correctly handle |
|
* unsupported commands. Furthermore, it is |
|
* possible that some of the currently |
|
* unsupported commands maybe supported in |
|
* future versions of the host. |
|
*/ |
|
if (!storvsc_scsi_cmd_ok(scmnd)) { |
|
scmnd->scsi_done(scmnd); |
|
return 0; |
|
} |
|
} |
|
|
|
/* Setup the cmd request */ |
|
cmd_request->cmd = scmnd; |
|
|
|
memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); |
|
vm_srb = &cmd_request->vstor_packet.vm_srb; |
|
vm_srb->win8_extension.time_out_value = 60; |
|
|
|
vm_srb->win8_extension.srb_flags |= |
|
SRB_FLAGS_DISABLE_SYNCH_TRANSFER; |
|
|
|
if (scmnd->device->tagged_supported) { |
|
vm_srb->win8_extension.srb_flags |= |
|
(SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); |
|
vm_srb->win8_extension.queue_tag = SP_UNTAGGED; |
|
vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; |
|
} |
|
|
|
/* Build the SRB */ |
|
switch (scmnd->sc_data_direction) { |
|
case DMA_TO_DEVICE: |
|
vm_srb->data_in = WRITE_TYPE; |
|
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; |
|
break; |
|
case DMA_FROM_DEVICE: |
|
vm_srb->data_in = READ_TYPE; |
|
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; |
|
break; |
|
case DMA_NONE: |
|
vm_srb->data_in = UNKNOWN_TYPE; |
|
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; |
|
break; |
|
default: |
|
/* |
|
* This is DMA_BIDIRECTIONAL or something else we are never |
|
* supposed to see here. |
|
*/ |
|
WARN(1, "Unexpected data direction: %d\n", |
|
scmnd->sc_data_direction); |
|
return -EINVAL; |
|
} |
|
|
|
|
|
vm_srb->port_number = host_dev->port; |
|
vm_srb->path_id = scmnd->device->channel; |
|
vm_srb->target_id = scmnd->device->id; |
|
vm_srb->lun = scmnd->device->lun; |
|
|
|
vm_srb->cdb_length = scmnd->cmd_len; |
|
|
|
memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); |
|
|
|
sgl = (struct scatterlist *)scsi_sglist(scmnd); |
|
sg_count = scsi_sg_count(scmnd); |
|
|
|
length = scsi_bufflen(scmnd); |
|
payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; |
|
payload_sz = sizeof(cmd_request->mpb); |
|
|
|
if (sg_count) { |
|
unsigned int hvpgoff, hvpfns_to_add; |
|
unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset); |
|
unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); |
|
u64 hvpfn; |
|
|
|
if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { |
|
|
|
payload_sz = (hvpg_count * sizeof(u64) + |
|
sizeof(struct vmbus_packet_mpb_array)); |
|
payload = kzalloc(payload_sz, GFP_ATOMIC); |
|
if (!payload) |
|
return SCSI_MLQUEUE_DEVICE_BUSY; |
|
} |
|
|
|
payload->range.len = length; |
|
payload->range.offset = offset_in_hvpg; |
|
|
|
|
|
for (i = 0; sgl != NULL; sgl = sg_next(sgl)) { |
|
/* |
|
* Init values for the current sgl entry. hvpgoff |
|
* and hvpfns_to_add are in units of Hyper-V size |
|
* pages. Handling the PAGE_SIZE != HV_HYP_PAGE_SIZE |
|
* case also handles values of sgl->offset that are |
|
* larger than PAGE_SIZE. Such offsets are handled |
|
* even on other than the first sgl entry, provided |
|
* they are a multiple of PAGE_SIZE. |
|
*/ |
|
hvpgoff = HVPFN_DOWN(sgl->offset); |
|
hvpfn = page_to_hvpfn(sg_page(sgl)) + hvpgoff; |
|
hvpfns_to_add = HVPFN_UP(sgl->offset + sgl->length) - |
|
hvpgoff; |
|
|
|
/* |
|
* Fill the next portion of the PFN array with |
|
* sequential Hyper-V PFNs for the continguous physical |
|
* memory described by the sgl entry. The end of the |
|
* last sgl should be reached at the same time that |
|
* the PFN array is filled. |
|
*/ |
|
while (hvpfns_to_add--) |
|
payload->range.pfn_array[i++] = hvpfn++; |
|
} |
|
} |
|
|
|
cmd_request->payload = payload; |
|
cmd_request->payload_sz = payload_sz; |
|
|
|
/* Invokes the vsc to start an IO */ |
|
ret = storvsc_do_io(dev, cmd_request, get_cpu()); |
|
put_cpu(); |
|
|
|
if (ret == -EAGAIN) { |
|
if (payload_sz > sizeof(cmd_request->mpb)) |
|
kfree(payload); |
|
/* no more space */ |
|
return SCSI_MLQUEUE_DEVICE_BUSY; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct scsi_host_template scsi_driver = { |
|
.module = THIS_MODULE, |
|
.name = "storvsc_host_t", |
|
.cmd_size = sizeof(struct storvsc_cmd_request), |
|
.bios_param = storvsc_get_chs, |
|
.queuecommand = storvsc_queuecommand, |
|
.eh_host_reset_handler = storvsc_host_reset_handler, |
|
.proc_name = "storvsc_host", |
|
.eh_timed_out = storvsc_eh_timed_out, |
|
.slave_alloc = storvsc_device_alloc, |
|
.slave_configure = storvsc_device_configure, |
|
.cmd_per_lun = 2048, |
|
.this_id = -1, |
|
/* Ensure there are no gaps in presented sgls */ |
|
.virt_boundary_mask = PAGE_SIZE-1, |
|
.no_write_same = 1, |
|
.track_queue_depth = 1, |
|
.change_queue_depth = storvsc_change_queue_depth, |
|
}; |
|
|
|
enum { |
|
SCSI_GUID, |
|
IDE_GUID, |
|
SFC_GUID, |
|
}; |
|
|
|
static const struct hv_vmbus_device_id id_table[] = { |
|
/* SCSI guid */ |
|
{ HV_SCSI_GUID, |
|
.driver_data = SCSI_GUID |
|
}, |
|
/* IDE guid */ |
|
{ HV_IDE_GUID, |
|
.driver_data = IDE_GUID |
|
}, |
|
/* Fibre Channel GUID */ |
|
{ |
|
HV_SYNTHFC_GUID, |
|
.driver_data = SFC_GUID |
|
}, |
|
{ }, |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(vmbus, id_table); |
|
|
|
static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; |
|
|
|
static bool hv_dev_is_fc(struct hv_device *hv_dev) |
|
{ |
|
return guid_equal(&fc_guid.guid, &hv_dev->dev_type); |
|
} |
|
|
|
static int storvsc_probe(struct hv_device *device, |
|
const struct hv_vmbus_device_id *dev_id) |
|
{ |
|
int ret; |
|
int num_cpus = num_online_cpus(); |
|
int num_present_cpus = num_present_cpus(); |
|
struct Scsi_Host *host; |
|
struct hv_host_device *host_dev; |
|
bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); |
|
bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); |
|
int target = 0; |
|
struct storvsc_device *stor_device; |
|
int max_luns_per_target; |
|
int max_targets; |
|
int max_channels; |
|
int max_sub_channels = 0; |
|
|
|
/* |
|
* Based on the windows host we are running on, |
|
* set state to properly communicate with the host. |
|
*/ |
|
|
|
if (vmbus_proto_version < VERSION_WIN8) { |
|
max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
|
max_targets = STORVSC_IDE_MAX_TARGETS; |
|
max_channels = STORVSC_IDE_MAX_CHANNELS; |
|
} else { |
|
max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; |
|
max_targets = STORVSC_MAX_TARGETS; |
|
max_channels = STORVSC_MAX_CHANNELS; |
|
/* |
|
* On Windows8 and above, we support sub-channels for storage |
|
* on SCSI and FC controllers. |
|
* The number of sub-channels offerred is based on the number of |
|
* VCPUs in the guest. |
|
*/ |
|
if (!dev_is_ide) |
|
max_sub_channels = |
|
(num_cpus - 1) / storvsc_vcpus_per_sub_channel; |
|
} |
|
|
|
scsi_driver.can_queue = max_outstanding_req_per_channel * |
|
(max_sub_channels + 1) * |
|
(100 - ring_avail_percent_lowater) / 100; |
|
|
|
host = scsi_host_alloc(&scsi_driver, |
|
sizeof(struct hv_host_device)); |
|
if (!host) |
|
return -ENOMEM; |
|
|
|
host_dev = shost_priv(host); |
|
memset(host_dev, 0, sizeof(struct hv_host_device)); |
|
|
|
host_dev->port = host->host_no; |
|
host_dev->dev = device; |
|
host_dev->host = host; |
|
|
|
|
|
stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
|
if (!stor_device) { |
|
ret = -ENOMEM; |
|
goto err_out0; |
|
} |
|
|
|
stor_device->destroy = false; |
|
init_waitqueue_head(&stor_device->waiting_to_drain); |
|
stor_device->device = device; |
|
stor_device->host = host; |
|
stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); |
|
spin_lock_init(&stor_device->lock); |
|
hv_set_drvdata(device, stor_device); |
|
|
|
stor_device->port_number = host->host_no; |
|
ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); |
|
if (ret) |
|
goto err_out1; |
|
|
|
host_dev->path = stor_device->path_id; |
|
host_dev->target = stor_device->target_id; |
|
|
|
switch (dev_id->driver_data) { |
|
case SFC_GUID: |
|
host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; |
|
host->max_id = STORVSC_FC_MAX_TARGETS; |
|
host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; |
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
host->transportt = fc_transport_template; |
|
#endif |
|
break; |
|
|
|
case SCSI_GUID: |
|
host->max_lun = max_luns_per_target; |
|
host->max_id = max_targets; |
|
host->max_channel = max_channels - 1; |
|
break; |
|
|
|
default: |
|
host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; |
|
host->max_id = STORVSC_IDE_MAX_TARGETS; |
|
host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; |
|
break; |
|
} |
|
/* max cmd length */ |
|
host->max_cmd_len = STORVSC_MAX_CMD_LEN; |
|
|
|
/* |
|
* set the table size based on the info we got |
|
* from the host. |
|
*/ |
|
host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); |
|
/* |
|
* For non-IDE disks, the host supports multiple channels. |
|
* Set the number of HW queues we are supporting. |
|
*/ |
|
if (!dev_is_ide) { |
|
if (storvsc_max_hw_queues > num_present_cpus) { |
|
storvsc_max_hw_queues = 0; |
|
storvsc_log(device, STORVSC_LOGGING_WARN, |
|
"Resetting invalid storvsc_max_hw_queues value to default.\n"); |
|
} |
|
if (storvsc_max_hw_queues) |
|
host->nr_hw_queues = storvsc_max_hw_queues; |
|
else |
|
host->nr_hw_queues = num_present_cpus; |
|
} |
|
|
|
/* |
|
* Set the error handler work queue. |
|
*/ |
|
host_dev->handle_error_wq = |
|
alloc_ordered_workqueue("storvsc_error_wq_%d", |
|
WQ_MEM_RECLAIM, |
|
host->host_no); |
|
if (!host_dev->handle_error_wq) { |
|
ret = -ENOMEM; |
|
goto err_out2; |
|
} |
|
INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); |
|
/* Register the HBA and start the scsi bus scan */ |
|
ret = scsi_add_host(host, &device->device); |
|
if (ret != 0) |
|
goto err_out3; |
|
|
|
if (!dev_is_ide) { |
|
scsi_scan_host(host); |
|
} else { |
|
target = (device->dev_instance.b[5] << 8 | |
|
device->dev_instance.b[4]); |
|
ret = scsi_add_device(host, 0, target, 0); |
|
if (ret) |
|
goto err_out4; |
|
} |
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
if (host->transportt == fc_transport_template) { |
|
struct fc_rport_identifiers ids = { |
|
.roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, |
|
}; |
|
|
|
fc_host_node_name(host) = stor_device->node_name; |
|
fc_host_port_name(host) = stor_device->port_name; |
|
stor_device->rport = fc_remote_port_add(host, 0, &ids); |
|
if (!stor_device->rport) { |
|
ret = -ENOMEM; |
|
goto err_out4; |
|
} |
|
} |
|
#endif |
|
return 0; |
|
|
|
err_out4: |
|
scsi_remove_host(host); |
|
|
|
err_out3: |
|
destroy_workqueue(host_dev->handle_error_wq); |
|
|
|
err_out2: |
|
/* |
|
* Once we have connected with the host, we would need to |
|
* to invoke storvsc_dev_remove() to rollback this state and |
|
* this call also frees up the stor_device; hence the jump around |
|
* err_out1 label. |
|
*/ |
|
storvsc_dev_remove(device); |
|
goto err_out0; |
|
|
|
err_out1: |
|
kfree(stor_device->stor_chns); |
|
kfree(stor_device); |
|
|
|
err_out0: |
|
scsi_host_put(host); |
|
return ret; |
|
} |
|
|
|
/* Change a scsi target's queue depth */ |
|
static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) |
|
{ |
|
if (queue_depth > scsi_driver.can_queue) |
|
queue_depth = scsi_driver.can_queue; |
|
|
|
return scsi_change_queue_depth(sdev, queue_depth); |
|
} |
|
|
|
static int storvsc_remove(struct hv_device *dev) |
|
{ |
|
struct storvsc_device *stor_device = hv_get_drvdata(dev); |
|
struct Scsi_Host *host = stor_device->host; |
|
struct hv_host_device *host_dev = shost_priv(host); |
|
|
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
if (host->transportt == fc_transport_template) { |
|
fc_remote_port_delete(stor_device->rport); |
|
fc_remove_host(host); |
|
} |
|
#endif |
|
destroy_workqueue(host_dev->handle_error_wq); |
|
scsi_remove_host(host); |
|
storvsc_dev_remove(dev); |
|
scsi_host_put(host); |
|
|
|
return 0; |
|
} |
|
|
|
static int storvsc_suspend(struct hv_device *hv_dev) |
|
{ |
|
struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); |
|
struct Scsi_Host *host = stor_device->host; |
|
struct hv_host_device *host_dev = shost_priv(host); |
|
|
|
storvsc_wait_to_drain(stor_device); |
|
|
|
drain_workqueue(host_dev->handle_error_wq); |
|
|
|
vmbus_close(hv_dev->channel); |
|
|
|
kfree(stor_device->stor_chns); |
|
stor_device->stor_chns = NULL; |
|
|
|
cpumask_clear(&stor_device->alloced_cpus); |
|
|
|
return 0; |
|
} |
|
|
|
static int storvsc_resume(struct hv_device *hv_dev) |
|
{ |
|
int ret; |
|
|
|
ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, |
|
hv_dev_is_fc(hv_dev)); |
|
return ret; |
|
} |
|
|
|
static struct hv_driver storvsc_drv = { |
|
.name = KBUILD_MODNAME, |
|
.id_table = id_table, |
|
.probe = storvsc_probe, |
|
.remove = storvsc_remove, |
|
.suspend = storvsc_suspend, |
|
.resume = storvsc_resume, |
|
.driver = { |
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS, |
|
}, |
|
}; |
|
|
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
|
static struct fc_function_template fc_transport_functions = { |
|
.show_host_node_name = 1, |
|
.show_host_port_name = 1, |
|
}; |
|
#endif |
|
|
|
static int __init storvsc_drv_init(void) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* Divide the ring buffer data size (which is 1 page less |
|
* than the ring buffer size since that page is reserved for |
|
* the ring buffer indices) by the max request size (which is |
|
* vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) |
|
* |
|
* The computation underestimates max_outstanding_req_per_channel |
|
* for Win7 and older hosts because it does not take into account |
|
* the vmscsi_size_delta correction to the max request size. |
|
*/ |
|
max_outstanding_req_per_channel = |
|
((storvsc_ringbuffer_size - PAGE_SIZE) / |
|
ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + |
|
sizeof(struct vstor_packet) + sizeof(u64), |
|
sizeof(u64))); |
|
|
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#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
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fc_transport_template = fc_attach_transport(&fc_transport_functions); |
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if (!fc_transport_template) |
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return -ENODEV; |
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#endif |
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|
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ret = vmbus_driver_register(&storvsc_drv); |
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|
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#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
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if (ret) |
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fc_release_transport(fc_transport_template); |
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#endif |
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|
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return ret; |
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} |
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|
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static void __exit storvsc_drv_exit(void) |
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{ |
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vmbus_driver_unregister(&storvsc_drv); |
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#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) |
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fc_release_transport(fc_transport_template); |
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#endif |
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} |
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|
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); |
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module_init(storvsc_drv_init); |
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module_exit(storvsc_drv_exit);
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