2237 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2009, Microsoft Corporation.4 *5 * Authors:6 * Haiyang Zhang <haiyangz@microsoft.com>7 * Hank Janssen <hjanssen@microsoft.com>8 * K. Y. Srinivasan <kys@microsoft.com>9 */10 11#include <linux/kernel.h>12#include <linux/wait.h>13#include <linux/sched.h>14#include <linux/completion.h>15#include <linux/string.h>16#include <linux/mm.h>17#include <linux/delay.h>18#include <linux/init.h>19#include <linux/slab.h>20#include <linux/module.h>21#include <linux/device.h>22#include <linux/hyperv.h>23#include <linux/blkdev.h>24#include <linux/dma-mapping.h>25 26#include <scsi/scsi.h>27#include <scsi/scsi_cmnd.h>28#include <scsi/scsi_host.h>29#include <scsi/scsi_device.h>30#include <scsi/scsi_tcq.h>31#include <scsi/scsi_eh.h>32#include <scsi/scsi_devinfo.h>33#include <scsi/scsi_dbg.h>34#include <scsi/scsi_transport_fc.h>35#include <scsi/scsi_transport.h>36 37/*38 * All wire protocol details (storage protocol between the guest and the host)39 * are consolidated here.40 *41 * Begin protocol definitions.42 */43 44/*45 * Version history:46 * V1 Beta: 0.147 * V1 RC < 2008/1/31: 1.048 * V1 RC > 2008/1/31: 2.049 * Win7: 4.250 * Win8: 5.151 * Win8.1: 6.052 * Win10: 6.253 */54 55#define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \56 (((MINOR_) & 0xff)))57#define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0)58#define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2)59#define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1)60#define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0)61#define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2)62 63/* channel callback timeout in ms */64#define CALLBACK_TIMEOUT 265 66/* Packet structure describing virtual storage requests. */67enum vstor_packet_operation {68 VSTOR_OPERATION_COMPLETE_IO = 1,69 VSTOR_OPERATION_REMOVE_DEVICE = 2,70 VSTOR_OPERATION_EXECUTE_SRB = 3,71 VSTOR_OPERATION_RESET_LUN = 4,72 VSTOR_OPERATION_RESET_ADAPTER = 5,73 VSTOR_OPERATION_RESET_BUS = 6,74 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,75 VSTOR_OPERATION_END_INITIALIZATION = 8,76 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,77 VSTOR_OPERATION_QUERY_PROPERTIES = 10,78 VSTOR_OPERATION_ENUMERATE_BUS = 11,79 VSTOR_OPERATION_FCHBA_DATA = 12,80 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,81 VSTOR_OPERATION_MAXIMUM = 1382};83 84/*85 * WWN packet for Fibre Channel HBA86 */87 88struct hv_fc_wwn_packet {89 u8 primary_active;90 u8 reserved1[3];91 u8 primary_port_wwn[8];92 u8 primary_node_wwn[8];93 u8 secondary_port_wwn[8];94 u8 secondary_node_wwn[8];95};96 97 98 99/*100 * SRB Flag Bits101 */102 103#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002104#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004105#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008106#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010107#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020108#define SRB_FLAGS_DATA_IN 0x00000040109#define SRB_FLAGS_DATA_OUT 0x00000080110#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000111#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)112#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100113#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200114#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400115 116/*117 * This flag indicates the request is part of the workflow for processing a D3.118 */119#define SRB_FLAGS_D3_PROCESSING 0x00000800120#define SRB_FLAGS_IS_ACTIVE 0x00010000121#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000122#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000123#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000124#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000125#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000126#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000127#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000128#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000129#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000130 131#define SP_UNTAGGED ((unsigned char) ~0)132#define SRB_SIMPLE_TAG_REQUEST 0x20133 134/*135 * Platform neutral description of a scsi request -136 * this remains the same across the write regardless of 32/64 bit137 * note: it's patterned off the SCSI_PASS_THROUGH structure138 */139#define STORVSC_MAX_CMD_LEN 0x10140 141/* Sense buffer size is the same for all versions since Windows 8 */142#define STORVSC_SENSE_BUFFER_SIZE 0x14143#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14144 145/*146 * The storage protocol version is determined during the147 * initial exchange with the host. It will indicate which148 * storage functionality is available in the host.149*/150static int vmstor_proto_version;151 152#define STORVSC_LOGGING_NONE 0153#define STORVSC_LOGGING_ERROR 1154#define STORVSC_LOGGING_WARN 2155 156static int logging_level = STORVSC_LOGGING_ERROR;157module_param(logging_level, int, S_IRUGO|S_IWUSR);158MODULE_PARM_DESC(logging_level,159 "Logging level, 0 - None, 1 - Error (default), 2 - Warning.");160 161static inline bool do_logging(int level)162{163 return logging_level >= level;164}165 166#define storvsc_log(dev, level, fmt, ...) \167do { \168 if (do_logging(level)) \169 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \170} while (0)171 172struct vmscsi_request {173 u16 length;174 u8 srb_status;175 u8 scsi_status;176 177 u8 port_number;178 u8 path_id;179 u8 target_id;180 u8 lun;181 182 u8 cdb_length;183 u8 sense_info_length;184 u8 data_in;185 u8 reserved;186 187 u32 data_transfer_length;188 189 union {190 u8 cdb[STORVSC_MAX_CMD_LEN];191 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];192 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];193 };194 /*195 * The following was added in win8.196 */197 u16 reserve;198 u8 queue_tag;199 u8 queue_action;200 u32 srb_flags;201 u32 time_out_value;202 u32 queue_sort_ey;203 204} __attribute((packed));205 206/*207 * The list of windows version in order of preference.208 */209 210static const int protocol_version[] = {211 VMSTOR_PROTO_VERSION_WIN10,212 VMSTOR_PROTO_VERSION_WIN8_1,213 VMSTOR_PROTO_VERSION_WIN8,214};215 216 217/*218 * This structure is sent during the initialization phase to get the different219 * properties of the channel.220 */221 222#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1223 224struct vmstorage_channel_properties {225 u32 reserved;226 u16 max_channel_cnt;227 u16 reserved1;228 229 u32 flags;230 u32 max_transfer_bytes;231 232 u64 reserved2;233} __packed;234 235/* This structure is sent during the storage protocol negotiations. */236struct vmstorage_protocol_version {237 /* Major (MSW) and minor (LSW) version numbers. */238 u16 major_minor;239 240 /*241 * Revision number is auto-incremented whenever this file is changed242 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not243 * definitely indicate incompatibility--but it does indicate mismatched244 * builds.245 * This is only used on the windows side. Just set it to 0.246 */247 u16 revision;248} __packed;249 250/* Channel Property Flags */251#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1252#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2253 254struct vstor_packet {255 /* Requested operation type */256 enum vstor_packet_operation operation;257 258 /* Flags - see below for values */259 u32 flags;260 261 /* Status of the request returned from the server side. */262 u32 status;263 264 /* Data payload area */265 union {266 /*267 * Structure used to forward SCSI commands from the268 * client to the server.269 */270 struct vmscsi_request vm_srb;271 272 /* Structure used to query channel properties. */273 struct vmstorage_channel_properties storage_channel_properties;274 275 /* Used during version negotiations. */276 struct vmstorage_protocol_version version;277 278 /* Fibre channel address packet */279 struct hv_fc_wwn_packet wwn_packet;280 281 /* Number of sub-channels to create */282 u16 sub_channel_count;283 284 /* This will be the maximum of the union members */285 u8 buffer[0x34];286 };287} __packed;288 289/*290 * Packet Flags:291 *292 * This flag indicates that the server should send back a completion for this293 * packet.294 */295 296#define REQUEST_COMPLETION_FLAG 0x1297 298/* Matches Windows-end */299enum storvsc_request_type {300 WRITE_TYPE = 0,301 READ_TYPE,302 UNKNOWN_TYPE,303};304 305/*306 * SRB status codes and masks. In the 8-bit field, the two high order bits307 * are flags, while the remaining 6 bits are an integer status code. The308 * definitions here include only the subset of the integer status codes that309 * are tested for in this driver.310 */311#define SRB_STATUS_AUTOSENSE_VALID 0x80312#define SRB_STATUS_QUEUE_FROZEN 0x40313 314/* SRB status integer codes */315#define SRB_STATUS_SUCCESS 0x01316#define SRB_STATUS_ABORTED 0x02317#define SRB_STATUS_ERROR 0x04318#define SRB_STATUS_INVALID_REQUEST 0x06319#define SRB_STATUS_TIMEOUT 0x09320#define SRB_STATUS_SELECTION_TIMEOUT 0x0A321#define SRB_STATUS_BUS_RESET 0x0E322#define SRB_STATUS_DATA_OVERRUN 0x12323#define SRB_STATUS_INVALID_LUN 0x20324#define SRB_STATUS_INTERNAL_ERROR 0x30325 326#define SRB_STATUS(status) \327 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN))328/*329 * This is the end of Protocol specific defines.330 */331 332static int storvsc_ringbuffer_size = (128 * 1024);333static int aligned_ringbuffer_size;334static u32 max_outstanding_req_per_channel;335static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth);336 337static int storvsc_vcpus_per_sub_channel = 4;338static unsigned int storvsc_max_hw_queues;339 340module_param(storvsc_ringbuffer_size, int, S_IRUGO);341MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");342 343module_param(storvsc_max_hw_queues, uint, 0644);344MODULE_PARM_DESC(storvsc_max_hw_queues, "Maximum number of hardware queues");345 346module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO);347MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels");348 349static int ring_avail_percent_lowater = 10;350module_param(ring_avail_percent_lowater, int, S_IRUGO);351MODULE_PARM_DESC(ring_avail_percent_lowater,352 "Select a channel if available ring size > this in percent");353 354/*355 * Timeout in seconds for all devices managed by this driver.356 */357static int storvsc_timeout = 180;358 359#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)360static struct scsi_transport_template *fc_transport_template;361#endif362 363static struct scsi_host_template scsi_driver;364static void storvsc_on_channel_callback(void *context);365 366#define STORVSC_MAX_LUNS_PER_TARGET 255367#define STORVSC_MAX_TARGETS 2368#define STORVSC_MAX_CHANNELS 8369 370#define STORVSC_FC_MAX_LUNS_PER_TARGET 255371#define STORVSC_FC_MAX_TARGETS 128372#define STORVSC_FC_MAX_CHANNELS 8373#define STORVSC_FC_MAX_XFER_SIZE ((u32)(512 * 1024))374 375#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64376#define STORVSC_IDE_MAX_TARGETS 1377#define STORVSC_IDE_MAX_CHANNELS 1378 379/*380 * Upper bound on the size of a storvsc packet.381 */382#define STORVSC_MAX_PKT_SIZE (sizeof(struct vmpacket_descriptor) +\383 sizeof(struct vstor_packet))384 385struct storvsc_cmd_request {386 struct scsi_cmnd *cmd;387 388 struct hv_device *device;389 390 /* Synchronize the request/response if needed */391 struct completion wait_event;392 393 struct vmbus_channel_packet_multipage_buffer mpb;394 struct vmbus_packet_mpb_array *payload;395 u32 payload_sz;396 397 struct vstor_packet vstor_packet;398};399 400 401/* A storvsc device is a device object that contains a vmbus channel */402struct storvsc_device {403 struct hv_device *device;404 405 bool destroy;406 bool drain_notify;407 atomic_t num_outstanding_req;408 struct Scsi_Host *host;409 410 wait_queue_head_t waiting_to_drain;411 412 /*413 * Each unique Port/Path/Target represents 1 channel ie scsi414 * controller. In reality, the pathid, targetid is always 0415 * and the port is set by us416 */417 unsigned int port_number;418 unsigned char path_id;419 unsigned char target_id;420 421 /*422 * Max I/O, the device can support.423 */424 u32 max_transfer_bytes;425 /*426 * Number of sub-channels we will open.427 */428 u16 num_sc;429 struct vmbus_channel **stor_chns;430 /*431 * Mask of CPUs bound to subchannels.432 */433 struct cpumask alloced_cpus;434 /*435 * Serializes modifications of stor_chns[] from storvsc_do_io()436 * and storvsc_change_target_cpu().437 */438 spinlock_t lock;439 /* Used for vsc/vsp channel reset process */440 struct storvsc_cmd_request init_request;441 struct storvsc_cmd_request reset_request;442 /*443 * Currently active port and node names for FC devices.444 */445 u64 node_name;446 u64 port_name;447#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)448 struct fc_rport *rport;449#endif450};451 452struct hv_host_device {453 struct hv_device *dev;454 unsigned int port;455 unsigned char path;456 unsigned char target;457 struct workqueue_struct *handle_error_wq;458 struct work_struct host_scan_work;459 struct Scsi_Host *host;460};461 462struct storvsc_scan_work {463 struct work_struct work;464 struct Scsi_Host *host;465 u8 lun;466 u8 tgt_id;467};468 469static void storvsc_device_scan(struct work_struct *work)470{471 struct storvsc_scan_work *wrk;472 struct scsi_device *sdev;473 474 wrk = container_of(work, struct storvsc_scan_work, work);475 476 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);477 if (!sdev)478 goto done;479 scsi_rescan_device(sdev);480 scsi_device_put(sdev);481 482done:483 kfree(wrk);484}485 486static void storvsc_host_scan(struct work_struct *work)487{488 struct Scsi_Host *host;489 struct scsi_device *sdev;490 struct hv_host_device *host_device =491 container_of(work, struct hv_host_device, host_scan_work);492 493 host = host_device->host;494 /*495 * Before scanning the host, first check to see if any of the496 * currently known devices have been hot removed. We issue a497 * "unit ready" command against all currently known devices.498 * This I/O will result in an error for devices that have been499 * removed. As part of handling the I/O error, we remove the device.500 *501 * When a LUN is added or removed, the host sends us a signal to502 * scan the host. Thus we are forced to discover the LUNs that503 * may have been removed this way.504 */505 mutex_lock(&host->scan_mutex);506 shost_for_each_device(sdev, host)507 scsi_test_unit_ready(sdev, 1, 1, NULL);508 mutex_unlock(&host->scan_mutex);509 /*510 * Now scan the host to discover LUNs that may have been added.511 */512 scsi_scan_host(host);513}514 515static void storvsc_remove_lun(struct work_struct *work)516{517 struct storvsc_scan_work *wrk;518 struct scsi_device *sdev;519 520 wrk = container_of(work, struct storvsc_scan_work, work);521 if (!scsi_host_get(wrk->host))522 goto done;523 524 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);525 526 if (sdev) {527 scsi_remove_device(sdev);528 scsi_device_put(sdev);529 }530 scsi_host_put(wrk->host);531 532done:533 kfree(wrk);534}535 536 537/*538 * We can get incoming messages from the host that are not in response to539 * messages that we have sent out. An example of this would be messages540 * received by the guest to notify dynamic addition/removal of LUNs. To541 * deal with potential race conditions where the driver may be in the542 * midst of being unloaded when we might receive an unsolicited message543 * from the host, we have implemented a mechanism to gurantee sequential544 * consistency:545 *546 * 1) Once the device is marked as being destroyed, we will fail all547 * outgoing messages.548 * 2) We permit incoming messages when the device is being destroyed,549 * only to properly account for messages already sent out.550 */551 552static inline struct storvsc_device *get_out_stor_device(553 struct hv_device *device)554{555 struct storvsc_device *stor_device;556 557 stor_device = hv_get_drvdata(device);558 559 if (stor_device && stor_device->destroy)560 stor_device = NULL;561 562 return stor_device;563}564 565 566static inline void storvsc_wait_to_drain(struct storvsc_device *dev)567{568 dev->drain_notify = true;569 wait_event(dev->waiting_to_drain,570 atomic_read(&dev->num_outstanding_req) == 0);571 dev->drain_notify = false;572}573 574static inline struct storvsc_device *get_in_stor_device(575 struct hv_device *device)576{577 struct storvsc_device *stor_device;578 579 stor_device = hv_get_drvdata(device);580 581 if (!stor_device)582 goto get_in_err;583 584 /*585 * If the device is being destroyed; allow incoming586 * traffic only to cleanup outstanding requests.587 */588 589 if (stor_device->destroy &&590 (atomic_read(&stor_device->num_outstanding_req) == 0))591 stor_device = NULL;592 593get_in_err:594 return stor_device;595 596}597 598static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old,599 u32 new)600{601 struct storvsc_device *stor_device;602 struct vmbus_channel *cur_chn;603 bool old_is_alloced = false;604 struct hv_device *device;605 unsigned long flags;606 int cpu;607 608 device = channel->primary_channel ?609 channel->primary_channel->device_obj610 : channel->device_obj;611 stor_device = get_out_stor_device(device);612 if (!stor_device)613 return;614 615 /* See storvsc_do_io() -> get_og_chn(). */616 spin_lock_irqsave(&stor_device->lock, flags);617 618 /*619 * Determines if the storvsc device has other channels assigned to620 * the "old" CPU to update the alloced_cpus mask and the stor_chns621 * array.622 */623 if (device->channel != channel && device->channel->target_cpu == old) {624 cur_chn = device->channel;625 old_is_alloced = true;626 goto old_is_alloced;627 }628 list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) {629 if (cur_chn == channel)630 continue;631 if (cur_chn->target_cpu == old) {632 old_is_alloced = true;633 goto old_is_alloced;634 }635 }636 637old_is_alloced:638 if (old_is_alloced)639 WRITE_ONCE(stor_device->stor_chns[old], cur_chn);640 else641 cpumask_clear_cpu(old, &stor_device->alloced_cpus);642 643 /* "Flush" the stor_chns array. */644 for_each_possible_cpu(cpu) {645 if (stor_device->stor_chns[cpu] && !cpumask_test_cpu(646 cpu, &stor_device->alloced_cpus))647 WRITE_ONCE(stor_device->stor_chns[cpu], NULL);648 }649 650 WRITE_ONCE(stor_device->stor_chns[new], channel);651 cpumask_set_cpu(new, &stor_device->alloced_cpus);652 653 spin_unlock_irqrestore(&stor_device->lock, flags);654}655 656static u64 storvsc_next_request_id(struct vmbus_channel *channel, u64 rqst_addr)657{658 struct storvsc_cmd_request *request =659 (struct storvsc_cmd_request *)(unsigned long)rqst_addr;660 661 if (rqst_addr == VMBUS_RQST_INIT)662 return VMBUS_RQST_INIT;663 if (rqst_addr == VMBUS_RQST_RESET)664 return VMBUS_RQST_RESET;665 666 /*667 * Cannot return an ID of 0, which is reserved for an unsolicited668 * message from Hyper-V.669 */670 return (u64)blk_mq_unique_tag(scsi_cmd_to_rq(request->cmd)) + 1;671}672 673static void handle_sc_creation(struct vmbus_channel *new_sc)674{675 struct hv_device *device = new_sc->primary_channel->device_obj;676 struct device *dev = &device->device;677 struct storvsc_device *stor_device;678 struct vmstorage_channel_properties props;679 int ret;680 681 stor_device = get_out_stor_device(device);682 if (!stor_device)683 return;684 685 memset(&props, 0, sizeof(struct vmstorage_channel_properties));686 new_sc->max_pkt_size = STORVSC_MAX_PKT_SIZE;687 688 new_sc->next_request_id_callback = storvsc_next_request_id;689 690 ret = vmbus_open(new_sc,691 aligned_ringbuffer_size,692 aligned_ringbuffer_size,693 (void *)&props,694 sizeof(struct vmstorage_channel_properties),695 storvsc_on_channel_callback, new_sc);696 697 /* In case vmbus_open() fails, we don't use the sub-channel. */698 if (ret != 0) {699 dev_err(dev, "Failed to open sub-channel: err=%d\n", ret);700 return;701 }702 703 new_sc->change_target_cpu_callback = storvsc_change_target_cpu;704 705 /* Add the sub-channel to the array of available channels. */706 stor_device->stor_chns[new_sc->target_cpu] = new_sc;707 cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus);708}709 710static void handle_multichannel_storage(struct hv_device *device, int max_chns)711{712 struct device *dev = &device->device;713 struct storvsc_device *stor_device;714 int num_sc;715 struct storvsc_cmd_request *request;716 struct vstor_packet *vstor_packet;717 int ret, t;718 719 /*720 * If the number of CPUs is artificially restricted, such as721 * with maxcpus=1 on the kernel boot line, Hyper-V could offer722 * sub-channels >= the number of CPUs. These sub-channels723 * should not be created. The primary channel is already created724 * and assigned to one CPU, so check against # CPUs - 1.725 */726 num_sc = min((int)(num_online_cpus() - 1), max_chns);727 if (!num_sc)728 return;729 730 stor_device = get_out_stor_device(device);731 if (!stor_device)732 return;733 734 stor_device->num_sc = num_sc;735 request = &stor_device->init_request;736 vstor_packet = &request->vstor_packet;737 738 /*739 * Establish a handler for dealing with subchannels.740 */741 vmbus_set_sc_create_callback(device->channel, handle_sc_creation);742 743 /*744 * Request the host to create sub-channels.745 */746 memset(request, 0, sizeof(struct storvsc_cmd_request));747 init_completion(&request->wait_event);748 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS;749 vstor_packet->flags = REQUEST_COMPLETION_FLAG;750 vstor_packet->sub_channel_count = num_sc;751 752 ret = vmbus_sendpacket(device->channel, vstor_packet,753 sizeof(struct vstor_packet),754 VMBUS_RQST_INIT,755 VM_PKT_DATA_INBAND,756 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);757 758 if (ret != 0) {759 dev_err(dev, "Failed to create sub-channel: err=%d\n", ret);760 return;761 }762 763 t = wait_for_completion_timeout(&request->wait_event, 10*HZ);764 if (t == 0) {765 dev_err(dev, "Failed to create sub-channel: timed out\n");766 return;767 }768 769 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||770 vstor_packet->status != 0) {771 dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n",772 vstor_packet->operation, vstor_packet->status);773 return;774 }775 776 /*777 * We need to do nothing here, because vmbus_process_offer()778 * invokes channel->sc_creation_callback, which will open and use779 * the sub-channel(s).780 */781}782 783static void cache_wwn(struct storvsc_device *stor_device,784 struct vstor_packet *vstor_packet)785{786 /*787 * Cache the currently active port and node ww names.788 */789 if (vstor_packet->wwn_packet.primary_active) {790 stor_device->node_name =791 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn);792 stor_device->port_name =793 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn);794 } else {795 stor_device->node_name =796 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn);797 stor_device->port_name =798 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn);799 }800}801 802 803static int storvsc_execute_vstor_op(struct hv_device *device,804 struct storvsc_cmd_request *request,805 bool status_check)806{807 struct storvsc_device *stor_device;808 struct vstor_packet *vstor_packet;809 int ret, t;810 811 stor_device = get_out_stor_device(device);812 if (!stor_device)813 return -ENODEV;814 815 vstor_packet = &request->vstor_packet;816 817 init_completion(&request->wait_event);818 vstor_packet->flags = REQUEST_COMPLETION_FLAG;819 820 ret = vmbus_sendpacket(device->channel, vstor_packet,821 sizeof(struct vstor_packet),822 VMBUS_RQST_INIT,823 VM_PKT_DATA_INBAND,824 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);825 if (ret != 0)826 return ret;827 828 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);829 if (t == 0)830 return -ETIMEDOUT;831 832 if (!status_check)833 return ret;834 835 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||836 vstor_packet->status != 0)837 return -EINVAL;838 839 return ret;840}841 842static int storvsc_channel_init(struct hv_device *device, bool is_fc)843{844 struct storvsc_device *stor_device;845 struct storvsc_cmd_request *request;846 struct vstor_packet *vstor_packet;847 int ret, i;848 int max_chns;849 bool process_sub_channels = false;850 851 stor_device = get_out_stor_device(device);852 if (!stor_device)853 return -ENODEV;854 855 request = &stor_device->init_request;856 vstor_packet = &request->vstor_packet;857 858 /*859 * Now, initiate the vsc/vsp initialization protocol on the open860 * channel861 */862 memset(request, 0, sizeof(struct storvsc_cmd_request));863 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;864 ret = storvsc_execute_vstor_op(device, request, true);865 if (ret)866 return ret;867 /*868 * Query host supported protocol version.869 */870 871 for (i = 0; i < ARRAY_SIZE(protocol_version); i++) {872 /* reuse the packet for version range supported */873 memset(vstor_packet, 0, sizeof(struct vstor_packet));874 vstor_packet->operation =875 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;876 877 vstor_packet->version.major_minor = protocol_version[i];878 879 /*880 * The revision number is only used in Windows; set it to 0.881 */882 vstor_packet->version.revision = 0;883 ret = storvsc_execute_vstor_op(device, request, false);884 if (ret != 0)885 return ret;886 887 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO)888 return -EINVAL;889 890 if (vstor_packet->status == 0) {891 vmstor_proto_version = protocol_version[i];892 893 break;894 }895 }896 897 if (vstor_packet->status != 0) {898 dev_err(&device->device, "Obsolete Hyper-V version\n");899 return -EINVAL;900 }901 902 903 memset(vstor_packet, 0, sizeof(struct vstor_packet));904 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;905 ret = storvsc_execute_vstor_op(device, request, true);906 if (ret != 0)907 return ret;908 909 /*910 * Check to see if multi-channel support is there.911 * Hosts that implement protocol version of 5.1 and above912 * support multi-channel.913 */914 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;915 916 /*917 * Allocate state to manage the sub-channels.918 * We allocate an array based on the numbers of possible CPUs919 * (Hyper-V does not support cpu online/offline).920 * This Array will be sparseley populated with unique921 * channels - primary + sub-channels.922 * We will however populate all the slots to evenly distribute923 * the load.924 */925 stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *),926 GFP_KERNEL);927 if (stor_device->stor_chns == NULL)928 return -ENOMEM;929 930 device->channel->change_target_cpu_callback = storvsc_change_target_cpu;931 932 stor_device->stor_chns[device->channel->target_cpu] = device->channel;933 cpumask_set_cpu(device->channel->target_cpu,934 &stor_device->alloced_cpus);935 936 if (vstor_packet->storage_channel_properties.flags &937 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)938 process_sub_channels = true;939 940 stor_device->max_transfer_bytes =941 vstor_packet->storage_channel_properties.max_transfer_bytes;942 943 if (!is_fc)944 goto done;945 946 /*947 * For FC devices retrieve FC HBA data.948 */949 memset(vstor_packet, 0, sizeof(struct vstor_packet));950 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA;951 ret = storvsc_execute_vstor_op(device, request, true);952 if (ret != 0)953 return ret;954 955 /*956 * Cache the currently active port and node ww names.957 */958 cache_wwn(stor_device, vstor_packet);959 960done:961 962 memset(vstor_packet, 0, sizeof(struct vstor_packet));963 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;964 ret = storvsc_execute_vstor_op(device, request, true);965 if (ret != 0)966 return ret;967 968 if (process_sub_channels)969 handle_multichannel_storage(device, max_chns);970 971 return ret;972}973 974static void storvsc_handle_error(struct vmscsi_request *vm_srb,975 struct scsi_cmnd *scmnd,976 struct Scsi_Host *host,977 u8 asc, u8 ascq)978{979 struct storvsc_scan_work *wrk;980 void (*process_err_fn)(struct work_struct *work);981 struct hv_host_device *host_dev = shost_priv(host);982 983 switch (SRB_STATUS(vm_srb->srb_status)) {984 case SRB_STATUS_ERROR:985 case SRB_STATUS_ABORTED:986 case SRB_STATUS_INVALID_REQUEST:987 case SRB_STATUS_INTERNAL_ERROR:988 case SRB_STATUS_TIMEOUT:989 case SRB_STATUS_SELECTION_TIMEOUT:990 case SRB_STATUS_BUS_RESET:991 case SRB_STATUS_DATA_OVERRUN:992 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) {993 /* Check for capacity change */994 if ((asc == 0x2a) && (ascq == 0x9)) {995 process_err_fn = storvsc_device_scan;996 /* Retry the I/O that triggered this. */997 set_host_byte(scmnd, DID_REQUEUE);998 goto do_work;999 }1000 1001 /*1002 * Check for "Operating parameters have changed"1003 * due to Hyper-V changing the VHD/VHDX BlockSize1004 * when adding/removing a differencing disk. This1005 * causes discard_granularity to change, so do a1006 * rescan to pick up the new granularity. We don't1007 * want scsi_report_sense() to output a message1008 * that a sysadmin wouldn't know what to do with.1009 */1010 if ((asc == 0x3f) && (ascq != 0x03) &&1011 (ascq != 0x0e)) {1012 process_err_fn = storvsc_device_scan;1013 set_host_byte(scmnd, DID_REQUEUE);1014 goto do_work;1015 }1016 1017 /*1018 * Otherwise, let upper layer deal with the1019 * error when sense message is present1020 */1021 return;1022 }1023 1024 /*1025 * If there is an error; offline the device since all1026 * error recovery strategies would have already been1027 * deployed on the host side. However, if the command1028 * were a pass-through command deal with it appropriately.1029 */1030 switch (scmnd->cmnd[0]) {1031 case ATA_16:1032 case ATA_12:1033 set_host_byte(scmnd, DID_PASSTHROUGH);1034 break;1035 /*1036 * On some Hyper-V hosts TEST_UNIT_READY command can1037 * return SRB_STATUS_ERROR. Let the upper level code1038 * deal with it based on the sense information.1039 */1040 case TEST_UNIT_READY:1041 break;1042 default:1043 set_host_byte(scmnd, DID_ERROR);1044 }1045 return;1046 1047 case SRB_STATUS_INVALID_LUN:1048 set_host_byte(scmnd, DID_NO_CONNECT);1049 process_err_fn = storvsc_remove_lun;1050 goto do_work;1051 1052 }1053 return;1054 1055do_work:1056 /*1057 * We need to schedule work to process this error; schedule it.1058 */1059 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);1060 if (!wrk) {1061 set_host_byte(scmnd, DID_BAD_TARGET);1062 return;1063 }1064 1065 wrk->host = host;1066 wrk->lun = vm_srb->lun;1067 wrk->tgt_id = vm_srb->target_id;1068 INIT_WORK(&wrk->work, process_err_fn);1069 queue_work(host_dev->handle_error_wq, &wrk->work);1070}1071 1072 1073static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request,1074 struct storvsc_device *stor_dev)1075{1076 struct scsi_cmnd *scmnd = cmd_request->cmd;1077 struct scsi_sense_hdr sense_hdr;1078 struct vmscsi_request *vm_srb;1079 u32 data_transfer_length;1080 struct Scsi_Host *host;1081 u32 payload_sz = cmd_request->payload_sz;1082 void *payload = cmd_request->payload;1083 bool sense_ok;1084 1085 host = stor_dev->host;1086 1087 vm_srb = &cmd_request->vstor_packet.vm_srb;1088 data_transfer_length = vm_srb->data_transfer_length;1089 1090 scmnd->result = vm_srb->scsi_status;1091 1092 if (scmnd->result) {1093 sense_ok = scsi_normalize_sense(scmnd->sense_buffer,1094 SCSI_SENSE_BUFFERSIZE, &sense_hdr);1095 1096 if (sense_ok && do_logging(STORVSC_LOGGING_WARN))1097 scsi_print_sense_hdr(scmnd->device, "storvsc",1098 &sense_hdr);1099 }1100 1101 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) {1102 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,1103 sense_hdr.ascq);1104 /*1105 * The Windows driver set data_transfer_length on1106 * SRB_STATUS_DATA_OVERRUN. On other errors, this value1107 * is untouched. In these cases we set it to 0.1108 */1109 if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN)1110 data_transfer_length = 0;1111 }1112 1113 /* Validate data_transfer_length (from Hyper-V) */1114 if (data_transfer_length > cmd_request->payload->range.len)1115 data_transfer_length = cmd_request->payload->range.len;1116 1117 scsi_set_resid(scmnd,1118 cmd_request->payload->range.len - data_transfer_length);1119 1120 scsi_done(scmnd);1121 1122 if (payload_sz >1123 sizeof(struct vmbus_channel_packet_multipage_buffer))1124 kfree(payload);1125}1126 1127static void storvsc_on_io_completion(struct storvsc_device *stor_device,1128 struct vstor_packet *vstor_packet,1129 struct storvsc_cmd_request *request)1130{1131 struct vstor_packet *stor_pkt;1132 struct hv_device *device = stor_device->device;1133 1134 stor_pkt = &request->vstor_packet;1135 1136 /*1137 * The current SCSI handling on the host side does1138 * not correctly handle:1139 * INQUIRY command with page code parameter set to 0x801140 * MODE_SENSE command with cmd[2] == 0x1c1141 *1142 * Setup srb and scsi status so this won't be fatal.1143 * We do this so we can distinguish truly fatal failues1144 * (srb status == 0x4) and off-line the device in that case.1145 */1146 1147 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||1148 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {1149 vstor_packet->vm_srb.scsi_status = 0;1150 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;1151 }1152 1153 /* Copy over the status...etc */1154 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;1155 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;1156 1157 /*1158 * Copy over the sense_info_length, but limit to the known max1159 * size if Hyper-V returns a bad value.1160 */1161 stor_pkt->vm_srb.sense_info_length = min_t(u8, STORVSC_SENSE_BUFFER_SIZE,1162 vstor_packet->vm_srb.sense_info_length);1163 1164 if (vstor_packet->vm_srb.scsi_status != 0 ||1165 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) {1166 1167 /*1168 * Log TEST_UNIT_READY errors only as warnings. Hyper-V can1169 * return errors when detecting devices using TEST_UNIT_READY,1170 * and logging these as errors produces unhelpful noise.1171 */1172 int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ?1173 STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR;1174 1175 storvsc_log(device, loglevel,1176 "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n",1177 scsi_cmd_to_rq(request->cmd)->tag,1178 stor_pkt->vm_srb.cdb[0],1179 vstor_packet->vm_srb.scsi_status,1180 vstor_packet->vm_srb.srb_status,1181 vstor_packet->status);1182 }1183 1184 if (vstor_packet->vm_srb.scsi_status == SAM_STAT_CHECK_CONDITION &&1185 (vstor_packet->vm_srb.srb_status & SRB_STATUS_AUTOSENSE_VALID))1186 memcpy(request->cmd->sense_buffer,1187 vstor_packet->vm_srb.sense_data,1188 stor_pkt->vm_srb.sense_info_length);1189 1190 stor_pkt->vm_srb.data_transfer_length =1191 vstor_packet->vm_srb.data_transfer_length;1192 1193 storvsc_command_completion(request, stor_device);1194 1195 if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&1196 stor_device->drain_notify)1197 wake_up(&stor_device->waiting_to_drain);1198}1199 1200static void storvsc_on_receive(struct storvsc_device *stor_device,1201 struct vstor_packet *vstor_packet,1202 struct storvsc_cmd_request *request)1203{1204 struct hv_host_device *host_dev;1205 switch (vstor_packet->operation) {1206 case VSTOR_OPERATION_COMPLETE_IO:1207 storvsc_on_io_completion(stor_device, vstor_packet, request);1208 break;1209 1210 case VSTOR_OPERATION_REMOVE_DEVICE:1211 case VSTOR_OPERATION_ENUMERATE_BUS:1212 host_dev = shost_priv(stor_device->host);1213 queue_work(1214 host_dev->handle_error_wq, &host_dev->host_scan_work);1215 break;1216 1217 case VSTOR_OPERATION_FCHBA_DATA:1218 cache_wwn(stor_device, vstor_packet);1219#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)1220 fc_host_node_name(stor_device->host) = stor_device->node_name;1221 fc_host_port_name(stor_device->host) = stor_device->port_name;1222#endif1223 break;1224 default:1225 break;1226 }1227}1228 1229static void storvsc_on_channel_callback(void *context)1230{1231 struct vmbus_channel *channel = (struct vmbus_channel *)context;1232 const struct vmpacket_descriptor *desc;1233 struct hv_device *device;1234 struct storvsc_device *stor_device;1235 struct Scsi_Host *shost;1236 unsigned long time_limit = jiffies + msecs_to_jiffies(CALLBACK_TIMEOUT);1237 1238 if (channel->primary_channel != NULL)1239 device = channel->primary_channel->device_obj;1240 else1241 device = channel->device_obj;1242 1243 stor_device = get_in_stor_device(device);1244 if (!stor_device)1245 return;1246 1247 shost = stor_device->host;1248 1249 foreach_vmbus_pkt(desc, channel) {1250 struct vstor_packet *packet = hv_pkt_data(desc);1251 struct storvsc_cmd_request *request = NULL;1252 u32 pktlen = hv_pkt_datalen(desc);1253 u64 rqst_id = desc->trans_id;1254 u32 minlen = rqst_id ? sizeof(struct vstor_packet) :1255 sizeof(enum vstor_packet_operation);1256 1257 if (unlikely(time_after(jiffies, time_limit))) {1258 hv_pkt_iter_close(channel);1259 return;1260 }1261 1262 if (pktlen < minlen) {1263 dev_err(&device->device,1264 "Invalid pkt: id=%llu, len=%u, minlen=%u\n",1265 rqst_id, pktlen, minlen);1266 continue;1267 }1268 1269 if (rqst_id == VMBUS_RQST_INIT) {1270 request = &stor_device->init_request;1271 } else if (rqst_id == VMBUS_RQST_RESET) {1272 request = &stor_device->reset_request;1273 } else {1274 /* Hyper-V can send an unsolicited message with ID of 0 */1275 if (rqst_id == 0) {1276 /*1277 * storvsc_on_receive() looks at the vstor_packet in the message1278 * from the ring buffer.1279 *1280 * - If the operation in the vstor_packet is COMPLETE_IO, then1281 * we call storvsc_on_io_completion(), and dereference the1282 * guest memory address. Make sure we don't call1283 * storvsc_on_io_completion() with a guest memory address1284 * that is zero if Hyper-V were to construct and send such1285 * a bogus packet.1286 *1287 * - If the operation in the vstor_packet is FCHBA_DATA, then1288 * we call cache_wwn(), and access the data payload area of1289 * the packet (wwn_packet); however, there is no guarantee1290 * that the packet is big enough to contain such area.1291 * Future-proof the code by rejecting such a bogus packet.1292 */1293 if (packet->operation == VSTOR_OPERATION_COMPLETE_IO ||1294 packet->operation == VSTOR_OPERATION_FCHBA_DATA) {1295 dev_err(&device->device, "Invalid packet with ID of 0\n");1296 continue;1297 }1298 } else {1299 struct scsi_cmnd *scmnd;1300 1301 /* Transaction 'rqst_id' corresponds to tag 'rqst_id - 1' */1302 scmnd = scsi_host_find_tag(shost, rqst_id - 1);1303 if (scmnd == NULL) {1304 dev_err(&device->device, "Incorrect transaction ID\n");1305 continue;1306 }1307 request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd);1308 scsi_dma_unmap(scmnd);1309 }1310 1311 storvsc_on_receive(stor_device, packet, request);1312 continue;1313 }1314 1315 memcpy(&request->vstor_packet, packet,1316 sizeof(struct vstor_packet));1317 complete(&request->wait_event);1318 }1319}1320 1321static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size,1322 bool is_fc)1323{1324 struct vmstorage_channel_properties props;1325 int ret;1326 1327 memset(&props, 0, sizeof(struct vmstorage_channel_properties));1328 1329 device->channel->max_pkt_size = STORVSC_MAX_PKT_SIZE;1330 device->channel->next_request_id_callback = storvsc_next_request_id;1331 1332 ret = vmbus_open(device->channel,1333 ring_size,1334 ring_size,1335 (void *)&props,1336 sizeof(struct vmstorage_channel_properties),1337 storvsc_on_channel_callback, device->channel);1338 1339 if (ret != 0)1340 return ret;1341 1342 ret = storvsc_channel_init(device, is_fc);1343 1344 return ret;1345}1346 1347static int storvsc_dev_remove(struct hv_device *device)1348{1349 struct storvsc_device *stor_device;1350 1351 stor_device = hv_get_drvdata(device);1352 1353 stor_device->destroy = true;1354 1355 /* Make sure flag is set before waiting */1356 wmb();1357 1358 /*1359 * At this point, all outbound traffic should be disable. We1360 * only allow inbound traffic (responses) to proceed so that1361 * outstanding requests can be completed.1362 */1363 1364 storvsc_wait_to_drain(stor_device);1365 1366 /*1367 * Since we have already drained, we don't need to busy wait1368 * as was done in final_release_stor_device()1369 * Note that we cannot set the ext pointer to NULL until1370 * we have drained - to drain the outgoing packets, we need to1371 * allow incoming packets.1372 */1373 hv_set_drvdata(device, NULL);1374 1375 /* Close the channel */1376 vmbus_close(device->channel);1377 1378 kfree(stor_device->stor_chns);1379 kfree(stor_device);1380 return 0;1381}1382 1383static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device,1384 u16 q_num)1385{1386 u16 slot = 0;1387 u16 hash_qnum;1388 const struct cpumask *node_mask;1389 int num_channels, tgt_cpu;1390 1391 if (stor_device->num_sc == 0) {1392 stor_device->stor_chns[q_num] = stor_device->device->channel;1393 return stor_device->device->channel;1394 }1395 1396 /*1397 * Our channel array is sparsley populated and we1398 * initiated I/O on a processor/hw-q that does not1399 * currently have a designated channel. Fix this.1400 * The strategy is simple:1401 * I. Ensure NUMA locality1402 * II. Distribute evenly (best effort)1403 */1404 1405 node_mask = cpumask_of_node(cpu_to_node(q_num));1406 1407 num_channels = 0;1408 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) {1409 if (cpumask_test_cpu(tgt_cpu, node_mask))1410 num_channels++;1411 }1412 if (num_channels == 0) {1413 stor_device->stor_chns[q_num] = stor_device->device->channel;1414 return stor_device->device->channel;1415 }1416 1417 hash_qnum = q_num;1418 while (hash_qnum >= num_channels)1419 hash_qnum -= num_channels;1420 1421 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) {1422 if (!cpumask_test_cpu(tgt_cpu, node_mask))1423 continue;1424 if (slot == hash_qnum)1425 break;1426 slot++;1427 }1428 1429 stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu];1430 1431 return stor_device->stor_chns[q_num];1432}1433 1434 1435static int storvsc_do_io(struct hv_device *device,1436 struct storvsc_cmd_request *request, u16 q_num)1437{1438 struct storvsc_device *stor_device;1439 struct vstor_packet *vstor_packet;1440 struct vmbus_channel *outgoing_channel, *channel;1441 unsigned long flags;1442 int ret = 0;1443 const struct cpumask *node_mask;1444 int tgt_cpu;1445 1446 vstor_packet = &request->vstor_packet;1447 stor_device = get_out_stor_device(device);1448 1449 if (!stor_device)1450 return -ENODEV;1451 1452 1453 request->device = device;1454 /*1455 * Select an appropriate channel to send the request out.1456 */1457 /* See storvsc_change_target_cpu(). */1458 outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]);1459 if (outgoing_channel != NULL) {1460 if (outgoing_channel->target_cpu == q_num) {1461 /*1462 * Ideally, we want to pick a different channel if1463 * available on the same NUMA node.1464 */1465 node_mask = cpumask_of_node(cpu_to_node(q_num));1466 for_each_cpu_wrap(tgt_cpu,1467 &stor_device->alloced_cpus, q_num + 1) {1468 if (!cpumask_test_cpu(tgt_cpu, node_mask))1469 continue;1470 if (tgt_cpu == q_num)1471 continue;1472 channel = READ_ONCE(1473 stor_device->stor_chns[tgt_cpu]);1474 if (channel == NULL)1475 continue;1476 if (hv_get_avail_to_write_percent(1477 &channel->outbound)1478 > ring_avail_percent_lowater) {1479 outgoing_channel = channel;1480 goto found_channel;1481 }1482 }1483 1484 /*1485 * All the other channels on the same NUMA node are1486 * busy. Try to use the channel on the current CPU1487 */1488 if (hv_get_avail_to_write_percent(1489 &outgoing_channel->outbound)1490 > ring_avail_percent_lowater)1491 goto found_channel;1492 1493 /*1494 * If we reach here, all the channels on the current1495 * NUMA node are busy. Try to find a channel in1496 * other NUMA nodes1497 */1498 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) {1499 if (cpumask_test_cpu(tgt_cpu, node_mask))1500 continue;1501 channel = READ_ONCE(1502 stor_device->stor_chns[tgt_cpu]);1503 if (channel == NULL)1504 continue;1505 if (hv_get_avail_to_write_percent(1506 &channel->outbound)1507 > ring_avail_percent_lowater) {1508 outgoing_channel = channel;1509 goto found_channel;1510 }1511 }1512 }1513 } else {1514 spin_lock_irqsave(&stor_device->lock, flags);1515 outgoing_channel = stor_device->stor_chns[q_num];1516 if (outgoing_channel != NULL) {1517 spin_unlock_irqrestore(&stor_device->lock, flags);1518 goto found_channel;1519 }1520 outgoing_channel = get_og_chn(stor_device, q_num);1521 spin_unlock_irqrestore(&stor_device->lock, flags);1522 }1523 1524found_channel:1525 vstor_packet->flags |= REQUEST_COMPLETION_FLAG;1526 1527 vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);1528 1529 1530 vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;1531 1532 1533 vstor_packet->vm_srb.data_transfer_length =1534 request->payload->range.len;1535 1536 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;1537 1538 if (request->payload->range.len) {1539 1540 ret = vmbus_sendpacket_mpb_desc(outgoing_channel,1541 request->payload, request->payload_sz,1542 vstor_packet,1543 sizeof(struct vstor_packet),1544 (unsigned long)request);1545 } else {1546 ret = vmbus_sendpacket(outgoing_channel, vstor_packet,1547 sizeof(struct vstor_packet),1548 (unsigned long)request,1549 VM_PKT_DATA_INBAND,1550 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);1551 }1552 1553 if (ret != 0)1554 return ret;1555 1556 atomic_inc(&stor_device->num_outstanding_req);1557 1558 return ret;1559}1560 1561static int storvsc_device_alloc(struct scsi_device *sdevice)1562{1563 /*1564 * Set blist flag to permit the reading of the VPD pages even when1565 * the target may claim SPC-2 compliance. MSFT targets currently1566 * claim SPC-2 compliance while they implement post SPC-2 features.1567 * With this flag we can correctly handle WRITE_SAME_16 issues.1568 *1569 * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but1570 * still supports REPORT LUN.1571 */1572 sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES;1573 1574 return 0;1575}1576 1577static int storvsc_device_configure(struct scsi_device *sdevice)1578{1579 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));1580 1581 /* storvsc devices don't support MAINTENANCE_IN SCSI cmd */1582 sdevice->no_report_opcodes = 1;1583 sdevice->no_write_same = 1;1584 1585 /*1586 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-31587 * if the device is a MSFT virtual device. If the host is1588 * WIN10 or newer, allow write_same.1589 */1590 if (!strncmp(sdevice->vendor, "Msft", 4)) {1591 switch (vmstor_proto_version) {1592 case VMSTOR_PROTO_VERSION_WIN8:1593 case VMSTOR_PROTO_VERSION_WIN8_1:1594 sdevice->scsi_level = SCSI_SPC_3;1595 break;1596 }1597 1598 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10)1599 sdevice->no_write_same = 0;1600 }1601 1602 return 0;1603}1604 1605static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,1606 sector_t capacity, int *info)1607{1608 sector_t nsect = capacity;1609 sector_t cylinders = nsect;1610 int heads, sectors_pt;1611 1612 /*1613 * We are making up these values; let us keep it simple.1614 */1615 heads = 0xff;1616 sectors_pt = 0x3f; /* Sectors per track */1617 sector_div(cylinders, heads * sectors_pt);1618 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)1619 cylinders = 0xffff;1620 1621 info[0] = heads;1622 info[1] = sectors_pt;1623 info[2] = (int)cylinders;1624 1625 return 0;1626}1627 1628static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)1629{1630 struct hv_host_device *host_dev = shost_priv(scmnd->device->host);1631 struct hv_device *device = host_dev->dev;1632 1633 struct storvsc_device *stor_device;1634 struct storvsc_cmd_request *request;1635 struct vstor_packet *vstor_packet;1636 int ret, t;1637 1638 stor_device = get_out_stor_device(device);1639 if (!stor_device)1640 return FAILED;1641 1642 request = &stor_device->reset_request;1643 vstor_packet = &request->vstor_packet;1644 memset(vstor_packet, 0, sizeof(struct vstor_packet));1645 1646 init_completion(&request->wait_event);1647 1648 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;1649 vstor_packet->flags = REQUEST_COMPLETION_FLAG;1650 vstor_packet->vm_srb.path_id = stor_device->path_id;1651 1652 ret = vmbus_sendpacket(device->channel, vstor_packet,1653 sizeof(struct vstor_packet),1654 VMBUS_RQST_RESET,1655 VM_PKT_DATA_INBAND,1656 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);1657 if (ret != 0)1658 return FAILED;1659 1660 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);1661 if (t == 0)1662 return TIMEOUT_ERROR;1663 1664 1665 /*1666 * At this point, all outstanding requests in the adapter1667 * should have been flushed out and return to us1668 * There is a potential race here where the host may be in1669 * the process of responding when we return from here.1670 * Just wait for all in-transit packets to be accounted for1671 * before we return from here.1672 */1673 storvsc_wait_to_drain(stor_device);1674 1675 return SUCCESS;1676}1677 1678/*1679 * The host guarantees to respond to each command, although I/O latencies might1680 * be unbounded on Azure. Reset the timer unconditionally to give the host a1681 * chance to perform EH.1682 */1683static enum scsi_timeout_action storvsc_eh_timed_out(struct scsi_cmnd *scmnd)1684{1685 return SCSI_EH_RESET_TIMER;1686}1687 1688static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)1689{1690 bool allowed = true;1691 u8 scsi_op = scmnd->cmnd[0];1692 1693 switch (scsi_op) {1694 /* the host does not handle WRITE_SAME, log accident usage */1695 case WRITE_SAME:1696 /*1697 * smartd sends this command and the host does not handle1698 * this. So, don't send it.1699 */1700 case SET_WINDOW:1701 set_host_byte(scmnd, DID_ERROR);1702 allowed = false;1703 break;1704 default:1705 break;1706 }1707 return allowed;1708}1709 1710static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)1711{1712 int ret;1713 struct hv_host_device *host_dev = shost_priv(host);1714 struct hv_device *dev = host_dev->dev;1715 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);1716 struct scatterlist *sgl;1717 struct vmscsi_request *vm_srb;1718 struct vmbus_packet_mpb_array *payload;1719 u32 payload_sz;1720 u32 length;1721 1722 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) {1723 /*1724 * On legacy hosts filter unimplemented commands.1725 * Future hosts are expected to correctly handle1726 * unsupported commands. Furthermore, it is1727 * possible that some of the currently1728 * unsupported commands maybe supported in1729 * future versions of the host.1730 */1731 if (!storvsc_scsi_cmd_ok(scmnd)) {1732 scsi_done(scmnd);1733 return 0;1734 }1735 }1736 1737 /* Setup the cmd request */1738 cmd_request->cmd = scmnd;1739 1740 memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet));1741 vm_srb = &cmd_request->vstor_packet.vm_srb;1742 vm_srb->time_out_value = 60;1743 1744 vm_srb->srb_flags |=1745 SRB_FLAGS_DISABLE_SYNCH_TRANSFER;1746 1747 if (scmnd->device->tagged_supported) {1748 vm_srb->srb_flags |=1749 (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE);1750 vm_srb->queue_tag = SP_UNTAGGED;1751 vm_srb->queue_action = SRB_SIMPLE_TAG_REQUEST;1752 }1753 1754 /* Build the SRB */1755 switch (scmnd->sc_data_direction) {1756 case DMA_TO_DEVICE:1757 vm_srb->data_in = WRITE_TYPE;1758 vm_srb->srb_flags |= SRB_FLAGS_DATA_OUT;1759 break;1760 case DMA_FROM_DEVICE:1761 vm_srb->data_in = READ_TYPE;1762 vm_srb->srb_flags |= SRB_FLAGS_DATA_IN;1763 break;1764 case DMA_NONE:1765 vm_srb->data_in = UNKNOWN_TYPE;1766 vm_srb->srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER;1767 break;1768 default:1769 /*1770 * This is DMA_BIDIRECTIONAL or something else we are never1771 * supposed to see here.1772 */1773 WARN(1, "Unexpected data direction: %d\n",1774 scmnd->sc_data_direction);1775 return -EINVAL;1776 }1777 1778 1779 vm_srb->port_number = host_dev->port;1780 vm_srb->path_id = scmnd->device->channel;1781 vm_srb->target_id = scmnd->device->id;1782 vm_srb->lun = scmnd->device->lun;1783 1784 vm_srb->cdb_length = scmnd->cmd_len;1785 1786 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);1787 1788 sgl = (struct scatterlist *)scsi_sglist(scmnd);1789 1790 length = scsi_bufflen(scmnd);1791 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;1792 payload_sz = 0;1793 1794 if (scsi_sg_count(scmnd)) {1795 unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset);1796 unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length);1797 struct scatterlist *sg;1798 unsigned long hvpfn, hvpfns_to_add;1799 int j, i = 0, sg_count;1800 1801 payload_sz = (hvpg_count * sizeof(u64) +1802 sizeof(struct vmbus_packet_mpb_array));1803 1804 if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {1805 payload = kzalloc(payload_sz, GFP_ATOMIC);1806 if (!payload)1807 return SCSI_MLQUEUE_DEVICE_BUSY;1808 }1809 1810 payload->range.len = length;1811 payload->range.offset = offset_in_hvpg;1812 1813 sg_count = scsi_dma_map(scmnd);1814 if (sg_count < 0) {1815 ret = SCSI_MLQUEUE_DEVICE_BUSY;1816 goto err_free_payload;1817 }1818 1819 for_each_sg(sgl, sg, sg_count, j) {1820 /*1821 * Init values for the current sgl entry. hvpfns_to_add1822 * is in units of Hyper-V size pages. Handling the1823 * PAGE_SIZE != HV_HYP_PAGE_SIZE case also handles1824 * values of sgl->offset that are larger than PAGE_SIZE.1825 * Such offsets are handled even on other than the first1826 * sgl entry, provided they are a multiple of PAGE_SIZE.1827 */1828 hvpfn = HVPFN_DOWN(sg_dma_address(sg));1829 hvpfns_to_add = HVPFN_UP(sg_dma_address(sg) +1830 sg_dma_len(sg)) - hvpfn;1831 1832 /*1833 * Fill the next portion of the PFN array with1834 * sequential Hyper-V PFNs for the continguous physical1835 * memory described by the sgl entry. The end of the1836 * last sgl should be reached at the same time that1837 * the PFN array is filled.1838 */1839 while (hvpfns_to_add--)1840 payload->range.pfn_array[i++] = hvpfn++;1841 }1842 }1843 1844 cmd_request->payload = payload;1845 cmd_request->payload_sz = payload_sz;1846 1847 /* Invokes the vsc to start an IO */1848 ret = storvsc_do_io(dev, cmd_request, get_cpu());1849 put_cpu();1850 1851 if (ret)1852 scsi_dma_unmap(scmnd);1853 1854 if (ret == -EAGAIN) {1855 /* no more space */1856 ret = SCSI_MLQUEUE_DEVICE_BUSY;1857 goto err_free_payload;1858 }1859 1860 return 0;1861 1862err_free_payload:1863 if (payload_sz > sizeof(cmd_request->mpb))1864 kfree(payload);1865 1866 return ret;1867}1868 1869static struct scsi_host_template scsi_driver = {1870 .module = THIS_MODULE,1871 .name = "storvsc_host_t",1872 .cmd_size = sizeof(struct storvsc_cmd_request),1873 .bios_param = storvsc_get_chs,1874 .queuecommand = storvsc_queuecommand,1875 .eh_host_reset_handler = storvsc_host_reset_handler,1876 .proc_name = "storvsc_host",1877 .eh_timed_out = storvsc_eh_timed_out,1878 .slave_alloc = storvsc_device_alloc,1879 .slave_configure = storvsc_device_configure,1880 .cmd_per_lun = 2048,1881 .this_id = -1,1882 /* Ensure there are no gaps in presented sgls */1883 .virt_boundary_mask = HV_HYP_PAGE_SIZE - 1,1884 .no_write_same = 1,1885 .track_queue_depth = 1,1886 .change_queue_depth = storvsc_change_queue_depth,1887};1888 1889enum {1890 SCSI_GUID,1891 IDE_GUID,1892 SFC_GUID,1893};1894 1895static const struct hv_vmbus_device_id id_table[] = {1896 /* SCSI guid */1897 { HV_SCSI_GUID,1898 .driver_data = SCSI_GUID1899 },1900 /* IDE guid */1901 { HV_IDE_GUID,1902 .driver_data = IDE_GUID1903 },1904 /* Fibre Channel GUID */1905 {1906 HV_SYNTHFC_GUID,1907 .driver_data = SFC_GUID1908 },1909 { },1910};1911 1912MODULE_DEVICE_TABLE(vmbus, id_table);1913 1914static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID };1915 1916static bool hv_dev_is_fc(struct hv_device *hv_dev)1917{1918 return guid_equal(&fc_guid.guid, &hv_dev->dev_type);1919}1920 1921static int storvsc_probe(struct hv_device *device,1922 const struct hv_vmbus_device_id *dev_id)1923{1924 int ret;1925 int num_cpus = num_online_cpus();1926 int num_present_cpus = num_present_cpus();1927 struct Scsi_Host *host;1928 struct hv_host_device *host_dev;1929 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);1930 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false);1931 int target = 0;1932 struct storvsc_device *stor_device;1933 int max_sub_channels = 0;1934 u32 max_xfer_bytes;1935 1936 /*1937 * We support sub-channels for storage on SCSI and FC controllers.1938 * The number of sub-channels offerred is based on the number of1939 * VCPUs in the guest.1940 */1941 if (!dev_is_ide)1942 max_sub_channels =1943 (num_cpus - 1) / storvsc_vcpus_per_sub_channel;1944 1945 scsi_driver.can_queue = max_outstanding_req_per_channel *1946 (max_sub_channels + 1) *1947 (100 - ring_avail_percent_lowater) / 100;1948 1949 host = scsi_host_alloc(&scsi_driver,1950 sizeof(struct hv_host_device));1951 if (!host)1952 return -ENOMEM;1953 1954 host_dev = shost_priv(host);1955 memset(host_dev, 0, sizeof(struct hv_host_device));1956 1957 host_dev->port = host->host_no;1958 host_dev->dev = device;1959 host_dev->host = host;1960 1961 1962 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);1963 if (!stor_device) {1964 ret = -ENOMEM;1965 goto err_out0;1966 }1967 1968 stor_device->destroy = false;1969 init_waitqueue_head(&stor_device->waiting_to_drain);1970 stor_device->device = device;1971 stor_device->host = host;1972 spin_lock_init(&stor_device->lock);1973 hv_set_drvdata(device, stor_device);1974 dma_set_min_align_mask(&device->device, HV_HYP_PAGE_SIZE - 1);1975 1976 stor_device->port_number = host->host_no;1977 ret = storvsc_connect_to_vsp(device, aligned_ringbuffer_size, is_fc);1978 if (ret)1979 goto err_out1;1980 1981 host_dev->path = stor_device->path_id;1982 host_dev->target = stor_device->target_id;1983 1984 switch (dev_id->driver_data) {1985 case SFC_GUID:1986 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;1987 host->max_id = STORVSC_FC_MAX_TARGETS;1988 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;1989#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)1990 host->transportt = fc_transport_template;1991#endif1992 break;1993 1994 case SCSI_GUID:1995 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;1996 host->max_id = STORVSC_MAX_TARGETS;1997 host->max_channel = STORVSC_MAX_CHANNELS - 1;1998 break;1999 2000 default:2001 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;2002 host->max_id = STORVSC_IDE_MAX_TARGETS;2003 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;2004 break;2005 }2006 /* max cmd length */2007 host->max_cmd_len = STORVSC_MAX_CMD_LEN;2008 /*2009 * Any reasonable Hyper-V configuration should provide2010 * max_transfer_bytes value aligning to HV_HYP_PAGE_SIZE,2011 * protecting it from any weird value.2012 */2013 max_xfer_bytes = round_down(stor_device->max_transfer_bytes, HV_HYP_PAGE_SIZE);2014 if (is_fc)2015 max_xfer_bytes = min(max_xfer_bytes, STORVSC_FC_MAX_XFER_SIZE);2016 2017 /* max_hw_sectors_kb */2018 host->max_sectors = max_xfer_bytes >> 9;2019 /*2020 * There are 2 requirements for Hyper-V storvsc sgl segments,2021 * based on which the below calculation for max segments is2022 * done:2023 *2024 * 1. Except for the first and last sgl segment, all sgl segments2025 * should be align to HV_HYP_PAGE_SIZE, that also means the2026 * maximum number of segments in a sgl can be calculated by2027 * dividing the total max transfer length by HV_HYP_PAGE_SIZE.2028 *2029 * 2. Except for the first and last, each entry in the SGL must2030 * have an offset that is a multiple of HV_HYP_PAGE_SIZE.2031 */2032 host->sg_tablesize = (max_xfer_bytes >> HV_HYP_PAGE_SHIFT) + 1;2033 /*2034 * For non-IDE disks, the host supports multiple channels.2035 * Set the number of HW queues we are supporting.2036 */2037 if (!dev_is_ide) {2038 if (storvsc_max_hw_queues > num_present_cpus) {2039 storvsc_max_hw_queues = 0;2040 storvsc_log(device, STORVSC_LOGGING_WARN,2041 "Resetting invalid storvsc_max_hw_queues value to default.\n");2042 }2043 if (storvsc_max_hw_queues)2044 host->nr_hw_queues = storvsc_max_hw_queues;2045 else2046 host->nr_hw_queues = num_present_cpus;2047 }2048 2049 /*2050 * Set the error handler work queue.2051 */2052 host_dev->handle_error_wq =2053 alloc_ordered_workqueue("storvsc_error_wq_%d",2054 0,2055 host->host_no);2056 if (!host_dev->handle_error_wq) {2057 ret = -ENOMEM;2058 goto err_out2;2059 }2060 INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan);2061 /* Register the HBA and start the scsi bus scan */2062 ret = scsi_add_host(host, &device->device);2063 if (ret != 0)2064 goto err_out3;2065 2066 if (!dev_is_ide) {2067 scsi_scan_host(host);2068 } else {2069 target = (device->dev_instance.b[5] << 8 |2070 device->dev_instance.b[4]);2071 ret = scsi_add_device(host, 0, target, 0);2072 if (ret)2073 goto err_out4;2074 }2075#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)2076 if (host->transportt == fc_transport_template) {2077 struct fc_rport_identifiers ids = {2078 .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR,2079 };2080 2081 fc_host_node_name(host) = stor_device->node_name;2082 fc_host_port_name(host) = stor_device->port_name;2083 stor_device->rport = fc_remote_port_add(host, 0, &ids);2084 if (!stor_device->rport) {2085 ret = -ENOMEM;2086 goto err_out4;2087 }2088 }2089#endif2090 return 0;2091 2092err_out4:2093 scsi_remove_host(host);2094 2095err_out3:2096 destroy_workqueue(host_dev->handle_error_wq);2097 2098err_out2:2099 /*2100 * Once we have connected with the host, we would need to2101 * invoke storvsc_dev_remove() to rollback this state and2102 * this call also frees up the stor_device; hence the jump around2103 * err_out1 label.2104 */2105 storvsc_dev_remove(device);2106 goto err_out0;2107 2108err_out1:2109 kfree(stor_device->stor_chns);2110 kfree(stor_device);2111 2112err_out0:2113 scsi_host_put(host);2114 return ret;2115}2116 2117/* Change a scsi target's queue depth */2118static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth)2119{2120 if (queue_depth > scsi_driver.can_queue)2121 queue_depth = scsi_driver.can_queue;2122 2123 return scsi_change_queue_depth(sdev, queue_depth);2124}2125 2126static void storvsc_remove(struct hv_device *dev)2127{2128 struct storvsc_device *stor_device = hv_get_drvdata(dev);2129 struct Scsi_Host *host = stor_device->host;2130 struct hv_host_device *host_dev = shost_priv(host);2131 2132#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)2133 if (host->transportt == fc_transport_template) {2134 fc_remote_port_delete(stor_device->rport);2135 fc_remove_host(host);2136 }2137#endif2138 destroy_workqueue(host_dev->handle_error_wq);2139 scsi_remove_host(host);2140 storvsc_dev_remove(dev);2141 scsi_host_put(host);2142}2143 2144static int storvsc_suspend(struct hv_device *hv_dev)2145{2146 struct storvsc_device *stor_device = hv_get_drvdata(hv_dev);2147 struct Scsi_Host *host = stor_device->host;2148 struct hv_host_device *host_dev = shost_priv(host);2149 2150 storvsc_wait_to_drain(stor_device);2151 2152 drain_workqueue(host_dev->handle_error_wq);2153 2154 vmbus_close(hv_dev->channel);2155 2156 kfree(stor_device->stor_chns);2157 stor_device->stor_chns = NULL;2158 2159 cpumask_clear(&stor_device->alloced_cpus);2160 2161 return 0;2162}2163 2164static int storvsc_resume(struct hv_device *hv_dev)2165{2166 int ret;2167 2168 ret = storvsc_connect_to_vsp(hv_dev, aligned_ringbuffer_size,2169 hv_dev_is_fc(hv_dev));2170 return ret;2171}2172 2173static struct hv_driver storvsc_drv = {2174 .name = KBUILD_MODNAME,2175 .id_table = id_table,2176 .probe = storvsc_probe,2177 .remove = storvsc_remove,2178 .suspend = storvsc_suspend,2179 .resume = storvsc_resume,2180 .driver = {2181 .probe_type = PROBE_PREFER_ASYNCHRONOUS,2182 },2183};2184 2185#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)2186static struct fc_function_template fc_transport_functions = {2187 .show_host_node_name = 1,2188 .show_host_port_name = 1,2189};2190#endif2191 2192static int __init storvsc_drv_init(void)2193{2194 int ret;2195 2196 /*2197 * Divide the ring buffer data size (which is 1 page less2198 * than the ring buffer size since that page is reserved for2199 * the ring buffer indices) by the max request size (which is2200 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)2201 */2202 aligned_ringbuffer_size = VMBUS_RING_SIZE(storvsc_ringbuffer_size);2203 max_outstanding_req_per_channel =2204 ((aligned_ringbuffer_size - PAGE_SIZE) /2205 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +2206 sizeof(struct vstor_packet) + sizeof(u64),2207 sizeof(u64)));2208 2209#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)2210 fc_transport_template = fc_attach_transport(&fc_transport_functions);2211 if (!fc_transport_template)2212 return -ENODEV;2213#endif2214 2215 ret = vmbus_driver_register(&storvsc_drv);2216 2217#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)2218 if (ret)2219 fc_release_transport(fc_transport_template);2220#endif2221 2222 return ret;2223}2224 2225static void __exit storvsc_drv_exit(void)2226{2227 vmbus_driver_unregister(&storvsc_drv);2228#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)2229 fc_release_transport(fc_transport_template);2230#endif2231}2232 2233MODULE_LICENSE("GPL");2234MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");2235module_init(storvsc_drv_init);2236module_exit(storvsc_drv_exit);2237