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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e86fb5e8ab
When ring buffer returns an error indicating retry, storvsc may not return a proper error code to SCSI when bounce buffer is not used. This has introduced I/O freeze on RAID running atop storvsc devices. This patch fixes it by always returning a proper error code. Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Christoph Hellwig <hch@lst.de> cc: stable@vger.kernel.org
1931 lines
48 KiB
C
1931 lines
48 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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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/mempool.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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/*
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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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*/
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#define VMSTOR_WIN7_MAJOR 4
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#define VMSTOR_WIN7_MINOR 2
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#define VMSTOR_WIN8_MAJOR 5
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#define VMSTOR_WIN8_MINOR 1
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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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bool primary_active;
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u8 reserved1;
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u8 reserved2;
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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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/*
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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.
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*/
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static int sense_buffer_size;
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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.
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*/
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static int vmscsi_size_delta;
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static int vmstor_current_major;
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static int vmstor_current_minor;
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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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* This structure is sent during the intialization 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_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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/*
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* This is the end of Protocol specific defines.
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*/
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/*
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* We setup a mempool to allocate request structures for this driver
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* on a per-lun basis. The following define specifies the number of
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* elements in the pool.
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*/
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#define STORVSC_MIN_BUF_NR 64
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static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
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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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/*
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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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static int msft_blist_flags = BLIST_TRY_VPD_PAGES;
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#define STORVSC_MAX_IO_REQUESTS 200
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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 list_head entry;
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struct scsi_cmnd *cmd;
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unsigned int bounce_sgl_count;
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struct scatterlist *bounce_sgl;
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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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unsigned char *sense_buffer;
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struct hv_multipage_buffer data_buffer;
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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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bool open_sub_channel;
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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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/* 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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struct stor_mem_pools {
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struct kmem_cache *request_pool;
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mempool_t *request_mempool;
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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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};
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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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uint lun;
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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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uint lun;
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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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lun = wrk->lun;
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sdev = scsi_device_lookup(wrk->host, 0, 0, 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_bus_scan(struct work_struct *work)
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{
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struct storvsc_scan_work *wrk;
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int id, order_id;
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wrk = container_of(work, struct storvsc_scan_work, work);
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for (id = 0; id < wrk->host->max_id; ++id) {
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if (wrk->host->reverse_ordering)
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order_id = wrk->host->max_id - id - 1;
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else
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order_id = id;
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scsi_scan_target(&wrk->host->shost_gendev, 0,
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order_id, SCAN_WILD_CARD, 1);
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}
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kfree(wrk);
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}
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static void storvsc_remove_lun(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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if (!scsi_host_get(wrk->host))
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goto done;
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sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun);
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if (sdev) {
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scsi_remove_device(sdev);
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scsi_device_put(sdev);
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}
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scsi_host_put(wrk->host);
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done:
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kfree(wrk);
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}
|
|
|
|
/*
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* Major/minor macros. Minor version is in LSB, meaning that earlier flat
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* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
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*/
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|
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static inline u16 storvsc_get_version(u8 major, u8 minor)
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{
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u16 version;
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|
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version = ((major << 8) | minor);
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return version;
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}
|
|
|
|
/*
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* We can get incoming messages from the host that are not in response to
|
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* messages that we have sent out. An example of this would be messages
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* received by the guest to notify dynamic addition/removal of LUNs. To
|
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* deal with potential race conditions where the driver may be in the
|
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* midst of being unloaded when we might receive an unsolicited message
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* from the host, we have implemented a mechanism to gurantee sequential
|
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* consistency:
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*
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* 1) Once the device is marked as being destroyed, we will fail all
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* outgoing messages.
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* 2) We permit incoming messages when the device is being destroyed,
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* only to properly account for messages already sent out.
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*/
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|
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static inline struct storvsc_device *get_out_stor_device(
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struct hv_device *device)
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{
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struct storvsc_device *stor_device;
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stor_device = hv_get_drvdata(device);
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if (stor_device && stor_device->destroy)
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stor_device = NULL;
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return stor_device;
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}
|
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|
|
|
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static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
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{
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dev->drain_notify = true;
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wait_event(dev->waiting_to_drain,
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atomic_read(&dev->num_outstanding_req) == 0);
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dev->drain_notify = false;
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}
|
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|
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static inline struct storvsc_device *get_in_stor_device(
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struct hv_device *device)
|
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{
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struct storvsc_device *stor_device;
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|
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stor_device = hv_get_drvdata(device);
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|
|
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 destroy_bounce_buffer(struct scatterlist *sgl,
|
|
unsigned int sg_count)
|
|
{
|
|
int i;
|
|
struct page *page_buf;
|
|
|
|
for (i = 0; i < sg_count; i++) {
|
|
page_buf = sg_page((&sgl[i]));
|
|
if (page_buf != NULL)
|
|
__free_page(page_buf);
|
|
}
|
|
|
|
kfree(sgl);
|
|
}
|
|
|
|
static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
|
|
{
|
|
int i;
|
|
|
|
/* No need to check */
|
|
if (sg_count < 2)
|
|
return -1;
|
|
|
|
/* We have at least 2 sg entries */
|
|
for (i = 0; i < sg_count; i++) {
|
|
if (i == 0) {
|
|
/* make sure 1st one does not have hole */
|
|
if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
|
|
return i;
|
|
} else if (i == sg_count - 1) {
|
|
/* make sure last one does not have hole */
|
|
if (sgl[i].offset != 0)
|
|
return i;
|
|
} else {
|
|
/* make sure no hole in the middle */
|
|
if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
|
|
unsigned int sg_count,
|
|
unsigned int len,
|
|
int write)
|
|
{
|
|
int i;
|
|
int num_pages;
|
|
struct scatterlist *bounce_sgl;
|
|
struct page *page_buf;
|
|
unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
|
|
|
|
num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
|
|
|
|
bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
|
|
if (!bounce_sgl)
|
|
return NULL;
|
|
|
|
sg_init_table(bounce_sgl, num_pages);
|
|
for (i = 0; i < num_pages; i++) {
|
|
page_buf = alloc_page(GFP_ATOMIC);
|
|
if (!page_buf)
|
|
goto cleanup;
|
|
sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0);
|
|
}
|
|
|
|
return bounce_sgl;
|
|
|
|
cleanup:
|
|
destroy_bounce_buffer(bounce_sgl, num_pages);
|
|
return NULL;
|
|
}
|
|
|
|
/* Disgusting wrapper functions */
|
|
static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx)
|
|
{
|
|
void *addr = kmap_atomic(sg_page(sgl + idx));
|
|
return (unsigned long)addr;
|
|
}
|
|
|
|
static inline void sg_kunmap_atomic(unsigned long addr)
|
|
{
|
|
kunmap_atomic((void *)addr);
|
|
}
|
|
|
|
|
|
/* Assume the original sgl has enough room */
|
|
static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
|
|
struct scatterlist *bounce_sgl,
|
|
unsigned int orig_sgl_count,
|
|
unsigned int bounce_sgl_count)
|
|
{
|
|
int i;
|
|
int j = 0;
|
|
unsigned long src, dest;
|
|
unsigned int srclen, destlen, copylen;
|
|
unsigned int total_copied = 0;
|
|
unsigned long bounce_addr = 0;
|
|
unsigned long dest_addr = 0;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
|
|
for (i = 0; i < orig_sgl_count; i++) {
|
|
dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
|
|
dest = dest_addr;
|
|
destlen = orig_sgl[i].length;
|
|
|
|
if (bounce_addr == 0)
|
|
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
|
|
|
|
while (destlen) {
|
|
src = bounce_addr + bounce_sgl[j].offset;
|
|
srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
|
|
|
|
copylen = min(srclen, destlen);
|
|
memcpy((void *)dest, (void *)src, copylen);
|
|
|
|
total_copied += copylen;
|
|
bounce_sgl[j].offset += copylen;
|
|
destlen -= copylen;
|
|
dest += copylen;
|
|
|
|
if (bounce_sgl[j].offset == bounce_sgl[j].length) {
|
|
/* full */
|
|
sg_kunmap_atomic(bounce_addr);
|
|
j++;
|
|
|
|
/*
|
|
* It is possible that the number of elements
|
|
* in the bounce buffer may not be equal to
|
|
* the number of elements in the original
|
|
* scatter list. Handle this correctly.
|
|
*/
|
|
|
|
if (j == bounce_sgl_count) {
|
|
/*
|
|
* We are done; cleanup and return.
|
|
*/
|
|
sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
|
|
local_irq_restore(flags);
|
|
return total_copied;
|
|
}
|
|
|
|
/* if we need to use another bounce buffer */
|
|
if (destlen || i != orig_sgl_count - 1)
|
|
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
|
|
} else if (destlen == 0 && i == orig_sgl_count - 1) {
|
|
/* unmap the last bounce that is < PAGE_SIZE */
|
|
sg_kunmap_atomic(bounce_addr);
|
|
}
|
|
}
|
|
|
|
sg_kunmap_atomic(dest_addr - orig_sgl[i].offset);
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return total_copied;
|
|
}
|
|
|
|
/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
|
|
static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
|
|
struct scatterlist *bounce_sgl,
|
|
unsigned int orig_sgl_count)
|
|
{
|
|
int i;
|
|
int j = 0;
|
|
unsigned long src, dest;
|
|
unsigned int srclen, destlen, copylen;
|
|
unsigned int total_copied = 0;
|
|
unsigned long bounce_addr = 0;
|
|
unsigned long src_addr = 0;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
|
|
for (i = 0; i < orig_sgl_count; i++) {
|
|
src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset;
|
|
src = src_addr;
|
|
srclen = orig_sgl[i].length;
|
|
|
|
if (bounce_addr == 0)
|
|
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
|
|
|
|
while (srclen) {
|
|
/* assume bounce offset always == 0 */
|
|
dest = bounce_addr + bounce_sgl[j].length;
|
|
destlen = PAGE_SIZE - bounce_sgl[j].length;
|
|
|
|
copylen = min(srclen, destlen);
|
|
memcpy((void *)dest, (void *)src, copylen);
|
|
|
|
total_copied += copylen;
|
|
bounce_sgl[j].length += copylen;
|
|
srclen -= copylen;
|
|
src += copylen;
|
|
|
|
if (bounce_sgl[j].length == PAGE_SIZE) {
|
|
/* full..move to next entry */
|
|
sg_kunmap_atomic(bounce_addr);
|
|
j++;
|
|
|
|
/* if we need to use another bounce buffer */
|
|
if (srclen || i != orig_sgl_count - 1)
|
|
bounce_addr = sg_kmap_atomic(bounce_sgl,j);
|
|
|
|
} else if (srclen == 0 && i == orig_sgl_count - 1) {
|
|
/* unmap the last bounce that is < PAGE_SIZE */
|
|
sg_kunmap_atomic(bounce_addr);
|
|
}
|
|
}
|
|
|
|
sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return total_copied;
|
|
}
|
|
|
|
static void handle_sc_creation(struct vmbus_channel *new_sc)
|
|
{
|
|
struct hv_device *device = new_sc->primary_channel->device_obj;
|
|
struct storvsc_device *stor_device;
|
|
struct vmstorage_channel_properties props;
|
|
|
|
stor_device = get_out_stor_device(device);
|
|
if (!stor_device)
|
|
return;
|
|
|
|
if (stor_device->open_sub_channel == false)
|
|
return;
|
|
|
|
memset(&props, 0, sizeof(struct vmstorage_channel_properties));
|
|
|
|
vmbus_open(new_sc,
|
|
storvsc_ringbuffer_size,
|
|
storvsc_ringbuffer_size,
|
|
(void *)&props,
|
|
sizeof(struct vmstorage_channel_properties),
|
|
storvsc_on_channel_callback, new_sc);
|
|
}
|
|
|
|
static void handle_multichannel_storage(struct hv_device *device, int max_chns)
|
|
{
|
|
struct storvsc_device *stor_device;
|
|
int num_cpus = num_online_cpus();
|
|
int num_sc;
|
|
struct storvsc_cmd_request *request;
|
|
struct vstor_packet *vstor_packet;
|
|
int ret, t;
|
|
|
|
num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns);
|
|
stor_device = get_out_stor_device(device);
|
|
if (!stor_device)
|
|
return;
|
|
|
|
request = &stor_device->init_request;
|
|
vstor_packet = &request->vstor_packet;
|
|
|
|
stor_device->open_sub_channel = true;
|
|
/*
|
|
* Establish a handler for dealing with subchannels.
|
|
*/
|
|
vmbus_set_sc_create_callback(device->channel, handle_sc_creation);
|
|
|
|
/*
|
|
* Check to see if sub-channels have already been created. This
|
|
* can happen when this driver is re-loaded after unloading.
|
|
*/
|
|
|
|
if (vmbus_are_subchannels_present(device->channel))
|
|
return;
|
|
|
|
stor_device->open_sub_channel = false;
|
|
/*
|
|
* 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)
|
|
return;
|
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 10*HZ);
|
|
if (t == 0)
|
|
return;
|
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
vstor_packet->status != 0)
|
|
return;
|
|
|
|
/*
|
|
* Now that we created the sub-channels, invoke the check; this
|
|
* may trigger the callback.
|
|
*/
|
|
stor_device->open_sub_channel = true;
|
|
vmbus_are_subchannels_present(device->channel);
|
|
}
|
|
|
|
static int storvsc_channel_init(struct hv_device *device)
|
|
{
|
|
struct storvsc_device *stor_device;
|
|
struct storvsc_cmd_request *request;
|
|
struct vstor_packet *vstor_packet;
|
|
int ret, t;
|
|
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));
|
|
init_completion(&request->wait_event);
|
|
vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
|
|
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)
|
|
goto cleanup;
|
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
vstor_packet->status != 0)
|
|
goto cleanup;
|
|
|
|
|
|
/* 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->flags = REQUEST_COMPLETION_FLAG;
|
|
|
|
vstor_packet->version.major_minor =
|
|
storvsc_get_version(vmstor_current_major, vmstor_current_minor);
|
|
|
|
/*
|
|
* The revision number is only used in Windows; set it to 0.
|
|
*/
|
|
vstor_packet->version.revision = 0;
|
|
|
|
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)
|
|
goto cleanup;
|
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
vstor_packet->status != 0)
|
|
goto cleanup;
|
|
|
|
|
|
memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
|
|
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)
|
|
goto cleanup;
|
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
vstor_packet->status != 0)
|
|
goto cleanup;
|
|
|
|
/*
|
|
* 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;
|
|
if ((vmbus_proto_version != VERSION_WIN7) &&
|
|
(vmbus_proto_version != VERSION_WS2008)) {
|
|
if (vstor_packet->storage_channel_properties.flags &
|
|
STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
|
|
process_sub_channels = true;
|
|
}
|
|
|
|
memset(vstor_packet, 0, sizeof(struct vstor_packet));
|
|
vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
|
|
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)
|
|
goto cleanup;
|
|
|
|
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
|
|
vstor_packet->status != 0)
|
|
goto cleanup;
|
|
|
|
if (process_sub_channels)
|
|
handle_multichannel_storage(device, max_chns);
|
|
|
|
|
|
cleanup:
|
|
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);
|
|
bool do_work = false;
|
|
|
|
switch (vm_srb->srb_status) {
|
|
case SRB_STATUS_ERROR:
|
|
/*
|
|
* 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_TARGET_FAILURE);
|
|
}
|
|
break;
|
|
case SRB_STATUS_INVALID_LUN:
|
|
do_work = true;
|
|
process_err_fn = storvsc_remove_lun;
|
|
break;
|
|
case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID):
|
|
if ((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;
|
|
INIT_WORK(&wrk->work, process_err_fn);
|
|
schedule_work(&wrk->work);
|
|
}
|
|
|
|
|
|
static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
|
|
{
|
|
struct scsi_cmnd *scmnd = cmd_request->cmd;
|
|
struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
|
|
void (*scsi_done_fn)(struct scsi_cmnd *);
|
|
struct scsi_sense_hdr sense_hdr;
|
|
struct vmscsi_request *vm_srb;
|
|
struct stor_mem_pools *memp = scmnd->device->hostdata;
|
|
struct Scsi_Host *host;
|
|
struct storvsc_device *stor_dev;
|
|
struct hv_device *dev = host_dev->dev;
|
|
|
|
stor_dev = get_in_stor_device(dev);
|
|
host = stor_dev->host;
|
|
|
|
vm_srb = &cmd_request->vstor_packet.vm_srb;
|
|
if (cmd_request->bounce_sgl_count) {
|
|
if (vm_srb->data_in == READ_TYPE)
|
|
copy_from_bounce_buffer(scsi_sglist(scmnd),
|
|
cmd_request->bounce_sgl,
|
|
scsi_sg_count(scmnd),
|
|
cmd_request->bounce_sgl_count);
|
|
destroy_bounce_buffer(cmd_request->bounce_sgl,
|
|
cmd_request->bounce_sgl_count);
|
|
}
|
|
|
|
scmnd->result = vm_srb->scsi_status;
|
|
|
|
if (scmnd->result) {
|
|
if (scsi_normalize_sense(scmnd->sense_buffer,
|
|
SCSI_SENSE_BUFFERSIZE, &sense_hdr))
|
|
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);
|
|
|
|
scsi_set_resid(scmnd,
|
|
cmd_request->data_buffer.len -
|
|
vm_srb->data_transfer_length);
|
|
|
|
scsi_done_fn = scmnd->scsi_done;
|
|
|
|
scmnd->host_scribble = NULL;
|
|
scmnd->scsi_done = NULL;
|
|
|
|
scsi_done_fn(scmnd);
|
|
|
|
mempool_free(cmd_request, memp->request_mempool);
|
|
}
|
|
|
|
static void storvsc_on_io_completion(struct hv_device *device,
|
|
struct vstor_packet *vstor_packet,
|
|
struct storvsc_cmd_request *request)
|
|
{
|
|
struct storvsc_device *stor_device;
|
|
struct vstor_packet *stor_pkt;
|
|
|
|
stor_device = hv_get_drvdata(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 & 0xFF) == 0x02) {
|
|
/* CHECK_CONDITION */
|
|
if (vstor_packet->vm_srb.srb_status &
|
|
SRB_STATUS_AUTOSENSE_VALID) {
|
|
/* autosense data available */
|
|
|
|
memcpy(request->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);
|
|
|
|
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 hv_device *device,
|
|
struct vstor_packet *vstor_packet,
|
|
struct storvsc_cmd_request *request)
|
|
{
|
|
struct storvsc_scan_work *work;
|
|
struct storvsc_device *stor_device;
|
|
|
|
switch (vstor_packet->operation) {
|
|
case VSTOR_OPERATION_COMPLETE_IO:
|
|
storvsc_on_io_completion(device, vstor_packet, request);
|
|
break;
|
|
|
|
case VSTOR_OPERATION_REMOVE_DEVICE:
|
|
case VSTOR_OPERATION_ENUMERATE_BUS:
|
|
stor_device = get_in_stor_device(device);
|
|
work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
|
|
if (!work)
|
|
return;
|
|
|
|
INIT_WORK(&work->work, storvsc_bus_scan);
|
|
work->host = stor_device->host;
|
|
schedule_work(&work->work);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void storvsc_on_channel_callback(void *context)
|
|
{
|
|
struct vmbus_channel *channel = (struct vmbus_channel *)context;
|
|
struct hv_device *device;
|
|
struct storvsc_device *stor_device;
|
|
u32 bytes_recvd;
|
|
u64 request_id;
|
|
unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
|
|
struct storvsc_cmd_request *request;
|
|
int ret;
|
|
|
|
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;
|
|
|
|
do {
|
|
ret = vmbus_recvpacket(channel, packet,
|
|
ALIGN((sizeof(struct vstor_packet) -
|
|
vmscsi_size_delta), 8),
|
|
&bytes_recvd, &request_id);
|
|
if (ret == 0 && bytes_recvd > 0) {
|
|
|
|
request = (struct storvsc_cmd_request *)
|
|
(unsigned long)request_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(device,
|
|
(struct vstor_packet *)packet,
|
|
request);
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
} while (1);
|
|
|
|
return;
|
|
}
|
|
|
|
static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
|
|
{
|
|
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);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int storvsc_dev_remove(struct hv_device *device)
|
|
{
|
|
struct storvsc_device *stor_device;
|
|
unsigned long flags;
|
|
|
|
stor_device = hv_get_drvdata(device);
|
|
|
|
spin_lock_irqsave(&device->channel->inbound_lock, flags);
|
|
stor_device->destroy = true;
|
|
spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
spin_lock_irqsave(&device->channel->inbound_lock, flags);
|
|
hv_set_drvdata(device, NULL);
|
|
spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
|
|
|
|
/* Close the channel */
|
|
vmbus_close(device->channel);
|
|
|
|
kfree(stor_device);
|
|
return 0;
|
|
}
|
|
|
|
static int storvsc_do_io(struct hv_device *device,
|
|
struct storvsc_cmd_request *request)
|
|
{
|
|
struct storvsc_device *stor_device;
|
|
struct vstor_packet *vstor_packet;
|
|
struct vmbus_channel *outgoing_channel;
|
|
int ret = 0;
|
|
|
|
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.
|
|
*/
|
|
|
|
outgoing_channel = vmbus_get_outgoing_channel(device->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->data_buffer.len;
|
|
|
|
vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
|
|
|
|
if (request->data_buffer.len) {
|
|
ret = vmbus_sendpacket_multipagebuffer(outgoing_channel,
|
|
&request->data_buffer,
|
|
vstor_packet,
|
|
(sizeof(struct vstor_packet) -
|
|
vmscsi_size_delta),
|
|
(unsigned long)request);
|
|
} else {
|
|
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;
|
|
|
|
atomic_inc(&stor_device->num_outstanding_req);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int storvsc_device_alloc(struct scsi_device *sdevice)
|
|
{
|
|
struct stor_mem_pools *memp;
|
|
int number = STORVSC_MIN_BUF_NR;
|
|
|
|
memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
|
|
if (!memp)
|
|
return -ENOMEM;
|
|
|
|
memp->request_pool =
|
|
kmem_cache_create(dev_name(&sdevice->sdev_dev),
|
|
sizeof(struct storvsc_cmd_request), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
|
|
if (!memp->request_pool)
|
|
goto err0;
|
|
|
|
memp->request_mempool = mempool_create(number, mempool_alloc_slab,
|
|
mempool_free_slab,
|
|
memp->request_pool);
|
|
|
|
if (!memp->request_mempool)
|
|
goto err1;
|
|
|
|
sdevice->hostdata = memp;
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
kmem_cache_destroy(memp->request_pool);
|
|
|
|
err0:
|
|
kfree(memp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void storvsc_device_destroy(struct scsi_device *sdevice)
|
|
{
|
|
struct stor_mem_pools *memp = sdevice->hostdata;
|
|
|
|
if (!memp)
|
|
return;
|
|
|
|
mempool_destroy(memp->request_mempool);
|
|
kmem_cache_destroy(memp->request_pool);
|
|
kfree(memp);
|
|
sdevice->hostdata = NULL;
|
|
}
|
|
|
|
static int storvsc_device_configure(struct scsi_device *sdevice)
|
|
{
|
|
scsi_change_queue_depth(sdevice, STORVSC_MAX_IO_REQUESTS);
|
|
|
|
blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
|
|
|
|
blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
|
|
|
|
blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
|
|
|
|
sdevice->no_write_same = 1;
|
|
|
|
/*
|
|
* Add blist flags 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 patch we can correctly handle WRITE_SAME_16 issues.
|
|
*/
|
|
sdevice->sdev_bflags |= msft_blist_flags;
|
|
|
|
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)
|
|
{
|
|
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;
|
|
unsigned int request_size = 0;
|
|
int i;
|
|
struct scatterlist *sgl;
|
|
unsigned int sg_count = 0;
|
|
struct vmscsi_request *vm_srb;
|
|
struct stor_mem_pools *memp = scmnd->device->hostdata;
|
|
|
|
if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
|
|
/*
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
request_size = sizeof(struct storvsc_cmd_request);
|
|
|
|
cmd_request = mempool_alloc(memp->request_mempool,
|
|
GFP_ATOMIC);
|
|
|
|
/*
|
|
* We might be invoked in an interrupt context; hence
|
|
* mempool_alloc() can fail.
|
|
*/
|
|
if (!cmd_request)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
|
|
memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
|
|
|
|
/* Setup the cmd request */
|
|
cmd_request->cmd = scmnd;
|
|
|
|
scmnd->host_scribble = (unsigned char *)cmd_request;
|
|
|
|
vm_srb = &cmd_request->vstor_packet.vm_srb;
|
|
vm_srb->win8_extension.time_out_value = 60;
|
|
|
|
vm_srb->win8_extension.srb_flags |=
|
|
(SRB_FLAGS_QUEUE_ACTION_ENABLE |
|
|
SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
|
|
|
|
/* 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;
|
|
default:
|
|
vm_srb->data_in = UNKNOWN_TYPE;
|
|
vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN |
|
|
SRB_FLAGS_DATA_OUT);
|
|
break;
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
cmd_request->sense_buffer = scmnd->sense_buffer;
|
|
|
|
|
|
cmd_request->data_buffer.len = scsi_bufflen(scmnd);
|
|
if (scsi_sg_count(scmnd)) {
|
|
sgl = (struct scatterlist *)scsi_sglist(scmnd);
|
|
sg_count = scsi_sg_count(scmnd);
|
|
|
|
/* check if we need to bounce the sgl */
|
|
if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
|
|
cmd_request->bounce_sgl =
|
|
create_bounce_buffer(sgl, scsi_sg_count(scmnd),
|
|
scsi_bufflen(scmnd),
|
|
vm_srb->data_in);
|
|
if (!cmd_request->bounce_sgl) {
|
|
ret = SCSI_MLQUEUE_HOST_BUSY;
|
|
goto queue_error;
|
|
}
|
|
|
|
cmd_request->bounce_sgl_count =
|
|
ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
|
|
PAGE_SHIFT;
|
|
|
|
if (vm_srb->data_in == WRITE_TYPE)
|
|
copy_to_bounce_buffer(sgl,
|
|
cmd_request->bounce_sgl,
|
|
scsi_sg_count(scmnd));
|
|
|
|
sgl = cmd_request->bounce_sgl;
|
|
sg_count = cmd_request->bounce_sgl_count;
|
|
}
|
|
|
|
cmd_request->data_buffer.offset = sgl[0].offset;
|
|
|
|
for (i = 0; i < sg_count; i++)
|
|
cmd_request->data_buffer.pfn_array[i] =
|
|
page_to_pfn(sg_page((&sgl[i])));
|
|
|
|
} else if (scsi_sglist(scmnd)) {
|
|
cmd_request->data_buffer.offset =
|
|
virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
|
|
cmd_request->data_buffer.pfn_array[0] =
|
|
virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
|
|
}
|
|
|
|
/* Invokes the vsc to start an IO */
|
|
ret = storvsc_do_io(dev, cmd_request);
|
|
|
|
if (ret == -EAGAIN) {
|
|
/* no more space */
|
|
|
|
if (cmd_request->bounce_sgl_count)
|
|
destroy_bounce_buffer(cmd_request->bounce_sgl,
|
|
cmd_request->bounce_sgl_count);
|
|
|
|
ret = SCSI_MLQUEUE_DEVICE_BUSY;
|
|
goto queue_error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
queue_error:
|
|
mempool_free(cmd_request, memp->request_mempool);
|
|
scmnd->host_scribble = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static struct scsi_host_template scsi_driver = {
|
|
.module = THIS_MODULE,
|
|
.name = "storvsc_host_t",
|
|
.bios_param = storvsc_get_chs,
|
|
.queuecommand = storvsc_queuecommand,
|
|
.eh_host_reset_handler = storvsc_host_reset_handler,
|
|
.eh_timed_out = storvsc_eh_timed_out,
|
|
.slave_alloc = storvsc_device_alloc,
|
|
.slave_destroy = storvsc_device_destroy,
|
|
.slave_configure = storvsc_device_configure,
|
|
.cmd_per_lun = 255,
|
|
.can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
|
|
.this_id = -1,
|
|
/* no use setting to 0 since ll_blk_rw reset it to 1 */
|
|
/* currently 32 */
|
|
.sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
/* Make sure we dont get a sg segment crosses a page boundary */
|
|
.dma_boundary = PAGE_SIZE-1,
|
|
.no_write_same = 1,
|
|
};
|
|
|
|
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;
|
|
struct Scsi_Host *host;
|
|
struct hv_host_device *host_dev;
|
|
bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
|
|
int target = 0;
|
|
struct storvsc_device *stor_device;
|
|
|
|
/*
|
|
* Based on the windows host we are running on,
|
|
* set state to properly communicate with the host.
|
|
*/
|
|
|
|
switch (vmbus_proto_version) {
|
|
case VERSION_WS2008:
|
|
case VERSION_WIN7:
|
|
sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
|
|
vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
|
|
vmstor_current_major = VMSTOR_WIN7_MAJOR;
|
|
vmstor_current_minor = VMSTOR_WIN7_MINOR;
|
|
break;
|
|
default:
|
|
sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
|
|
vmscsi_size_delta = 0;
|
|
vmstor_current_major = VMSTOR_WIN8_MAJOR;
|
|
vmstor_current_minor = VMSTOR_WIN8_MINOR;
|
|
break;
|
|
}
|
|
|
|
if (dev_id->driver_data == SFC_GUID)
|
|
scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
|
|
STORVSC_FC_MAX_TARGETS);
|
|
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;
|
|
|
|
|
|
stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
|
|
if (!stor_device) {
|
|
ret = -ENOMEM;
|
|
goto err_out0;
|
|
}
|
|
|
|
stor_device->destroy = false;
|
|
stor_device->open_sub_channel = 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);
|
|
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;
|
|
break;
|
|
|
|
case SCSI_GUID:
|
|
host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
|
|
host->max_id = STORVSC_MAX_TARGETS;
|
|
host->max_channel = STORVSC_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;
|
|
|
|
/* Register the HBA and start the scsi bus scan */
|
|
ret = scsi_add_host(host, &device->device);
|
|
if (ret != 0)
|
|
goto err_out2;
|
|
|
|
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) {
|
|
scsi_remove_host(host);
|
|
goto err_out2;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
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);
|
|
|
|
err_out0:
|
|
scsi_host_put(host);
|
|
return ret;
|
|
}
|
|
|
|
static int storvsc_remove(struct hv_device *dev)
|
|
{
|
|
struct storvsc_device *stor_device = hv_get_drvdata(dev);
|
|
struct Scsi_Host *host = stor_device->host;
|
|
|
|
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,
|
|
};
|
|
|
|
static int __init storvsc_drv_init(void)
|
|
{
|
|
u32 max_outstanding_req_per_channel;
|
|
|
|
/*
|
|
* 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 (max_outstanding_req_per_channel <
|
|
STORVSC_MAX_IO_REQUESTS)
|
|
return -EINVAL;
|
|
|
|
return vmbus_driver_register(&storvsc_drv);
|
|
}
|
|
|
|
static void __exit storvsc_drv_exit(void)
|
|
{
|
|
vmbus_driver_unregister(&storvsc_drv);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
|
|
module_init(storvsc_drv_init);
|
|
module_exit(storvsc_drv_exit);
|