mirror of https://gitee.com/openkylin/linux.git
1999 lines
51 KiB
C
1999 lines
51 KiB
C
// 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 <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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* K. Y. Srinivasan <kys@microsoft.com>
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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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* 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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* 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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#define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
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(((MINOR_) & 0xff)))
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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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/* 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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* WWN packet for Fibre Channel HBA
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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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* SRB Flag Bits
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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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* 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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#define SP_UNTAGGED ((unsigned char) ~0)
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#define SRB_SIMPLE_TAG_REQUEST 0x20
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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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#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
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#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
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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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* 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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* 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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#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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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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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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#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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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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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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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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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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u32 data_transfer_length;
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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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} __attribute((packed));
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/*
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* The size of the vmscsi_request has changed in win8. The
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* additional size is because of new elements added to the
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* structure. These elements are valid only when we are talking
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* to a win8 host.
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* Track the correction to size we need to apply. This value
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* will likely change during protocol negotiation but it is
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* valid to start by assuming pre-Win8.
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*/
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static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
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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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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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* 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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#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
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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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u32 flags;
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u32 max_transfer_bytes;
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u64 reserved2;
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} __packed;
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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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* 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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/* 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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struct vstor_packet {
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/* Requested operation type */
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enum vstor_packet_operation operation;
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/* Flags - see below for values */
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u32 flags;
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/* Status of the request returned from the server side. */
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u32 status;
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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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/* Structure used to query channel properties. */
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struct vmstorage_channel_properties storage_channel_properties;
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/* Used during version negotiations. */
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struct vmstorage_protocol_version version;
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/* Fibre channel address packet */
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struct hv_fc_wwn_packet wwn_packet;
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/* Number of sub-channels to create */
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u16 sub_channel_count;
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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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* 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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#define REQUEST_COMPLETION_FLAG 0x1
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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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* SRB status codes and masks; a subset of the codes used here.
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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.
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*/
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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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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_vcpus_per_sub_channel, int, S_IRUGO);
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MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels");
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static int ring_avail_percent_lowater = 10;
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module_param(ring_avail_percent_lowater, int, S_IRUGO);
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MODULE_PARM_DESC(ring_avail_percent_lowater,
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"Select a channel if available ring size > this in percent");
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/*
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* Timeout in seconds for all devices managed by this driver.
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*/
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static int storvsc_timeout = 180;
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#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
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static struct scsi_transport_template *fc_transport_template;
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#endif
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static void storvsc_on_channel_callback(void *context);
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#define STORVSC_MAX_LUNS_PER_TARGET 255
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#define STORVSC_MAX_TARGETS 2
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#define STORVSC_MAX_CHANNELS 8
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#define STORVSC_FC_MAX_LUNS_PER_TARGET 255
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#define STORVSC_FC_MAX_TARGETS 128
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#define STORVSC_FC_MAX_CHANNELS 8
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#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
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#define STORVSC_IDE_MAX_TARGETS 1
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#define STORVSC_IDE_MAX_CHANNELS 1
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struct storvsc_cmd_request {
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struct scsi_cmnd *cmd;
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struct hv_device *device;
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/* Synchronize the request/response if needed */
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struct completion wait_event;
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struct vmbus_channel_packet_multipage_buffer mpb;
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struct vmbus_packet_mpb_array *payload;
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u32 payload_sz;
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struct vstor_packet vstor_packet;
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};
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/* A storvsc device is a device object that contains a vmbus channel */
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struct storvsc_device {
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struct hv_device *device;
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bool destroy;
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bool drain_notify;
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atomic_t num_outstanding_req;
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struct Scsi_Host *host;
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wait_queue_head_t waiting_to_drain;
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/*
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* Each unique Port/Path/Target represents 1 channel ie scsi
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* controller. In reality, the pathid, targetid is always 0
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* and the port is set by us
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*/
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unsigned int port_number;
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unsigned char path_id;
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unsigned char target_id;
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/*
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* Max I/O, the device can support.
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*/
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u32 max_transfer_bytes;
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/*
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* Number of sub-channels we will open.
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*/
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u16 num_sc;
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struct vmbus_channel **stor_chns;
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/*
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* Mask of CPUs bound to subchannels.
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*/
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struct cpumask alloced_cpus;
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/* Used for vsc/vsp channel reset process */
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struct storvsc_cmd_request init_request;
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struct storvsc_cmd_request reset_request;
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/*
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* Currently active port and node names for FC devices.
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*/
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u64 node_name;
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u64 port_name;
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#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
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struct fc_rport *rport;
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#endif
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};
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struct hv_host_device {
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struct hv_device *dev;
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unsigned int port;
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unsigned char path;
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unsigned char target;
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struct workqueue_struct *handle_error_wq;
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struct work_struct host_scan_work;
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struct Scsi_Host *host;
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};
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struct storvsc_scan_work {
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struct work_struct work;
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struct Scsi_Host *host;
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u8 lun;
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u8 tgt_id;
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};
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static void storvsc_device_scan(struct work_struct *work)
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{
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struct storvsc_scan_work *wrk;
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struct scsi_device *sdev;
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wrk = container_of(work, struct storvsc_scan_work, work);
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sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);
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if (!sdev)
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goto done;
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scsi_rescan_device(&sdev->sdev_gendev);
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scsi_device_put(sdev);
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done:
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kfree(wrk);
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}
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static void storvsc_host_scan(struct work_struct *work)
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{
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struct Scsi_Host *host;
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struct scsi_device *sdev;
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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 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));
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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) -
|
|
vmscsi_size_delta),
|
|
(unsigned long)request,
|
|
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 vstor_packet *vstor_packet;
|
|
int ret, t;
|
|
|
|
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) -
|
|
vmscsi_size_delta),
|
|
(unsigned long)request,
|
|
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;
|
|
|
|
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;
|
|
|
|
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);
|
|
bool do_work = false;
|
|
|
|
switch (SRB_STATUS(vm_srb->srb_status)) {
|
|
case SRB_STATUS_ERROR:
|
|
/*
|
|
* Let upper layer deal with error when
|
|
* sense message is present.
|
|
*/
|
|
|
|
if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID)
|
|
break;
|
|
/*
|
|
* 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 Windows 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);
|
|
}
|
|
break;
|
|
case SRB_STATUS_INVALID_LUN:
|
|
set_host_byte(scmnd, DID_NO_CONNECT);
|
|
do_work = true;
|
|
process_err_fn = storvsc_remove_lun;
|
|
break;
|
|
case SRB_STATUS_ABORTED:
|
|
if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID &&
|
|
(asc == 0x2a) && (ascq == 0x9)) {
|
|
do_work = true;
|
|
process_err_fn = storvsc_device_scan;
|
|
/*
|
|
* Retry the I/O that trigerred this.
|
|
*/
|
|
set_host_byte(scmnd, DID_REQUEUE);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (!do_work)
|
|
return;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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) {
|
|
if (scsi_normalize_sense(scmnd->sense_buffer,
|
|
SCSI_SENSE_BUFFERSIZE, &sense_hdr) &&
|
|
!(sense_hdr.sense_key == NOT_READY &&
|
|
sense_hdr.asc == 0x03A) &&
|
|
do_logging(STORVSC_LOGGING_ERROR))
|
|
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;
|
|
}
|
|
|
|
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;
|
|
stor_pkt->vm_srb.sense_info_length =
|
|
vstor_packet->vm_srb.sense_info_length;
|
|
|
|
if (vstor_packet->vm_srb.scsi_status != 0 ||
|
|
vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS)
|
|
storvsc_log(device, STORVSC_LOGGING_WARN,
|
|
"cmd 0x%x scsi status 0x%x srb status 0x%x\n",
|
|
stor_pkt->vm_srb.cdb[0],
|
|
vstor_packet->vm_srb.scsi_status,
|
|
vstor_packet->vm_srb.srb_status);
|
|
|
|
if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
|
|
/* CHECK_CONDITION */
|
|
if (vstor_packet->vm_srb.srb_status &
|
|
SRB_STATUS_AUTOSENSE_VALID) {
|
|
/* autosense data available */
|
|
|
|
storvsc_log(device, STORVSC_LOGGING_WARN,
|
|
"stor pkt %p autosense data valid - len %d\n",
|
|
request, vstor_packet->vm_srb.sense_info_length);
|
|
|
|
memcpy(request->cmd->sense_buffer,
|
|
vstor_packet->vm_srb.sense_data,
|
|
vstor_packet->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;
|
|
|
|
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;
|
|
|
|
foreach_vmbus_pkt(desc, channel) {
|
|
void *packet = hv_pkt_data(desc);
|
|
struct storvsc_cmd_request *request;
|
|
|
|
request = (struct storvsc_cmd_request *)
|
|
((unsigned long)desc->trans_id);
|
|
|
|
if (request == &stor_device->init_request ||
|
|
request == &stor_device->reset_request) {
|
|
memcpy(&request->vstor_packet, packet,
|
|
(sizeof(struct vstor_packet) - vmscsi_size_delta));
|
|
complete(&request->wait_event);
|
|
} else {
|
|
storvsc_on_receive(stor_device, packet, request);
|
|
}
|
|
}
|
|
}
|
|
|
|
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));
|
|
|
|
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)
|
|
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)
|
|
* III. Mapping is persistent.
|
|
*/
|
|
|
|
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)
|
|
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;
|
|
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 an appropriate channel to send the request out.
|
|
*/
|
|
if (stor_device->stor_chns[q_num] != NULL) {
|
|
outgoing_channel = stor_device->stor_chns[q_num];
|
|
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 = stor_device->stor_chns[tgt_cpu];
|
|
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 = stor_device->stor_chns[tgt_cpu];
|
|
if (hv_get_avail_to_write_percent(
|
|
&channel->outbound)
|
|
> ring_avail_percent_lowater) {
|
|
outgoing_channel = channel;
|
|
goto found_channel;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
outgoing_channel = get_og_chn(stor_device, q_num);
|
|
}
|
|
|
|
found_channel:
|
|
vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
|
|
|
|
vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
|
|
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) -
|
|
vmscsi_size_delta),
|
|
(unsigned long)request);
|
|
} else {
|
|
ret = vmbus_sendpacket(outgoing_channel, vstor_packet,
|
|
(sizeof(struct vstor_packet) -
|
|
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;
|
|
|
|
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) -
|
|
vmscsi_size_delta),
|
|
(unsigned long)&stor_device->reset_request,
|
|
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:
|
|
scmnd->result = ILLEGAL_REQUEST << 16;
|
|
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 = 0;
|
|
struct vmscsi_request *vm_srb;
|
|
struct scatterlist *cur_sgl;
|
|
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;
|
|
|
|
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) {
|
|
if (sg_count > MAX_PAGE_BUFFER_COUNT) {
|
|
|
|
payload_sz = (sg_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 = sgl[0].offset;
|
|
|
|
cur_sgl = sgl;
|
|
for (i = 0; i < sg_count; i++) {
|
|
payload->range.pfn_array[i] =
|
|
page_to_pfn(sg_page((cur_sgl)));
|
|
cur_sgl = sg_next(cur_sgl);
|
|
}
|
|
}
|
|
|
|
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,
|
|
/* Make sure we dont get a sg segment crosses a page boundary */
|
|
.dma_boundary = PAGE_SIZE-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 int storvsc_probe(struct hv_device *device,
|
|
const struct hv_vmbus_device_id *dev_id)
|
|
{
|
|
int ret;
|
|
int num_cpus = num_online_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;
|
|
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);
|
|
/*
|
|
* Set the number of HW queues we are supporting.
|
|
*/
|
|
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)
|
|
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 struct hv_driver storvsc_drv = {
|
|
.name = KBUILD_MODNAME,
|
|
.id_table = id_table,
|
|
.probe = storvsc_probe,
|
|
.remove = storvsc_remove,
|
|
.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)
|
|
*/
|
|
max_outstanding_req_per_channel =
|
|
((storvsc_ringbuffer_size - PAGE_SIZE) /
|
|
ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
|
|
sizeof(struct vstor_packet) + sizeof(u64) -
|
|
vmscsi_size_delta,
|
|
sizeof(u64)));
|
|
|
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
|
|
fc_transport_template = fc_attach_transport(&fc_transport_functions);
|
|
if (!fc_transport_template)
|
|
return -ENODEV;
|
|
#endif
|
|
|
|
ret = vmbus_driver_register(&storvsc_drv);
|
|
|
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
|
|
if (ret)
|
|
fc_release_transport(fc_transport_template);
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit storvsc_drv_exit(void)
|
|
{
|
|
vmbus_driver_unregister(&storvsc_drv);
|
|
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
|
|
fc_release_transport(fc_transport_template);
|
|
#endif
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
|
|
module_init(storvsc_drv_init);
|
|
module_exit(storvsc_drv_exit);
|