| /* |
| * Copyright (c) 2009, Microsoft Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| * Place - Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * Authors: |
| * Haiyang Zhang <haiyangz@microsoft.com> |
| * Hank Janssen <hjanssen@microsoft.com> |
| */ |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include "hv_api.h" |
| #include "logging.h" |
| #include "storvsc_api.h" |
| #include "vmbus_packet_format.h" |
| #include "vstorage.h" |
| #include "channel.h" |
| |
| |
| struct storvsc_request_extension { |
| /* LIST_ENTRY ListEntry; */ |
| |
| struct hv_storvsc_request *request; |
| struct hv_device *device; |
| |
| /* Synchronize the request/response if needed */ |
| int wait_condition; |
| wait_queue_head_t wait_event; |
| |
| struct vstor_packet vstor_packet; |
| }; |
| |
| /* A storvsc device is a device object that contains a vmbus channel */ |
| struct storvsc_device { |
| struct hv_device *device; |
| |
| /* 0 indicates the device is being destroyed */ |
| atomic_t ref_count; |
| |
| atomic_t num_outstanding_req; |
| |
| /* |
| * Each unique Port/Path/Target represents 1 channel ie scsi |
| * controller. In reality, the pathid, targetid is always 0 |
| * and the port is set by us |
| */ |
| unsigned int port_number; |
| unsigned char path_id; |
| unsigned char target_id; |
| |
| /* LIST_ENTRY OutstandingRequestList; */ |
| /* HANDLE OutstandingRequestLock; */ |
| |
| /* Used for vsc/vsp channel reset process */ |
| struct storvsc_request_extension init_request; |
| struct storvsc_request_extension reset_request; |
| }; |
| |
| |
| static const char *g_driver_name = "storvsc"; |
| |
| /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ |
| static const struct hv_guid gStorVscDeviceType = { |
| .data = { |
| 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, |
| 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f |
| } |
| }; |
| |
| |
| static inline struct storvsc_device *alloc_stor_device(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); |
| if (!stor_device) |
| return NULL; |
| |
| /* Set to 2 to allow both inbound and outbound traffics */ |
| /* (ie get_stor_device() and must_get_stor_device()) to proceed. */ |
| atomic_cmpxchg(&stor_device->ref_count, 0, 2); |
| |
| stor_device->device = device; |
| device->ext = stor_device; |
| |
| return stor_device; |
| } |
| |
| static inline void free_stor_device(struct storvsc_device *device) |
| { |
| /* ASSERT(atomic_read(&device->ref_count) == 0); */ |
| kfree(device); |
| } |
| |
| /* Get the stordevice object iff exists and its refcount > 1 */ |
| static inline struct storvsc_device *get_stor_device(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| if (stor_device && atomic_read(&stor_device->ref_count) > 1) |
| atomic_inc(&stor_device->ref_count); |
| else |
| stor_device = NULL; |
| |
| return stor_device; |
| } |
| |
| /* Get the stordevice object iff exists and its refcount > 0 */ |
| static inline struct storvsc_device *must_get_stor_device( |
| struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| if (stor_device && atomic_read(&stor_device->ref_count)) |
| atomic_inc(&stor_device->ref_count); |
| else |
| stor_device = NULL; |
| |
| return stor_device; |
| } |
| |
| static inline void put_stor_device(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| /* ASSERT(stor_device); */ |
| |
| atomic_dec(&stor_device->ref_count); |
| /* ASSERT(atomic_read(&stor_device->ref_count)); */ |
| } |
| |
| /* Drop ref count to 1 to effectively disable get_stor_device() */ |
| static inline struct storvsc_device *release_stor_device( |
| struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| /* ASSERT(stor_device); */ |
| |
| /* Busy wait until the ref drop to 2, then set it to 1 */ |
| while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2) |
| udelay(100); |
| |
| return stor_device; |
| } |
| |
| /* Drop ref count to 0. No one can use stor_device object. */ |
| static inline struct storvsc_device *final_release_stor_device( |
| struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| stor_device = (struct storvsc_device *)device->ext; |
| /* ASSERT(stor_device); */ |
| |
| /* Busy wait until the ref drop to 1, then set it to 0 */ |
| while (atomic_cmpxchg(&stor_device->ref_count, 1, 0) != 1) |
| udelay(100); |
| |
| device->ext = NULL; |
| return stor_device; |
| } |
| |
| static int stor_vsc_channel_init(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| struct storvsc_request_extension *request; |
| struct vstor_packet *vstor_packet; |
| int ret; |
| |
| stor_device = get_stor_device(device); |
| if (!stor_device) { |
| DPRINT_ERR(STORVSC, "unable to get stor device..." |
| "device being destroyed?"); |
| return -1; |
| } |
| |
| 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_request_extension)); |
| init_waitqueue_head(&request->wait_event); |
| vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| |
| DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION..."); |
| |
| request->wait_condition = 0; |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) { |
| DPRINT_ERR(STORVSC, |
| "unable to send BEGIN_INITIALIZATION_OPERATION"); |
| goto cleanup; |
| } |
| |
| wait_event_timeout(request->wait_event, request->wait_condition, |
| msecs_to_jiffies(1000)); |
| if (request->wait_condition == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed " |
| "(op %d status 0x%x)", |
| vstor_packet->operation, vstor_packet->status); |
| goto cleanup; |
| } |
| |
| DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION..."); |
| |
| /* 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 = VMSTOR_PROTOCOL_VERSION_CURRENT; |
| FILL_VMSTOR_REVISION(vstor_packet->version.revision); |
| |
| request->wait_condition = 0; |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) { |
| DPRINT_ERR(STORVSC, |
| "unable to send BEGIN_INITIALIZATION_OPERATION"); |
| goto cleanup; |
| } |
| |
| wait_event_timeout(request->wait_event, request->wait_condition, |
| msecs_to_jiffies(1000)); |
| if (request->wait_condition == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| /* TODO: Check returned version */ |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed " |
| "(op %d status 0x%x)", |
| vstor_packet->operation, vstor_packet->status); |
| goto cleanup; |
| } |
| |
| /* Query channel properties */ |
| DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION..."); |
| |
| memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
| vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| vstor_packet->storage_channel_properties.port_number = |
| stor_device->port_number; |
| |
| request->wait_condition = 0; |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| if (ret != 0) { |
| DPRINT_ERR(STORVSC, |
| "unable to send QUERY_PROPERTIES_OPERATION"); |
| goto cleanup; |
| } |
| |
| wait_event_timeout(request->wait_event, request->wait_condition, |
| msecs_to_jiffies(1000)); |
| if (request->wait_condition == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| /* TODO: Check returned version */ |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed " |
| "(op %d status 0x%x)", |
| vstor_packet->operation, vstor_packet->status); |
| goto cleanup; |
| } |
| |
| stor_device->path_id = vstor_packet->storage_channel_properties.path_id; |
| stor_device->target_id |
| = vstor_packet->storage_channel_properties.target_id; |
| |
| DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x", |
| vstor_packet->storage_channel_properties.flags, |
| vstor_packet->storage_channel_properties.max_transfer_bytes); |
| |
| DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION..."); |
| |
| memset(vstor_packet, 0, sizeof(struct vstor_packet)); |
| vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; |
| vstor_packet->flags = REQUEST_COMPLETION_FLAG; |
| |
| request->wait_condition = 0; |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| if (ret != 0) { |
| DPRINT_ERR(STORVSC, |
| "unable to send END_INITIALIZATION_OPERATION"); |
| goto cleanup; |
| } |
| |
| wait_event_timeout(request->wait_event, request->wait_condition, |
| msecs_to_jiffies(1000)); |
| if (request->wait_condition == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || |
| vstor_packet->status != 0) { |
| DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed " |
| "(op %d status 0x%x)", |
| vstor_packet->operation, vstor_packet->status); |
| goto cleanup; |
| } |
| |
| DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****"); |
| |
| cleanup: |
| put_stor_device(device); |
| return ret; |
| } |
| |
| static void stor_vsc_on_io_completion(struct hv_device *device, |
| struct vstor_packet *vstor_packet, |
| struct storvsc_request_extension *request_ext) |
| { |
| struct hv_storvsc_request *request; |
| struct storvsc_device *stor_device; |
| |
| stor_device = must_get_stor_device(device); |
| if (!stor_device) { |
| DPRINT_ERR(STORVSC, "unable to get stor device..." |
| "device being destroyed?"); |
| return; |
| } |
| |
| DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request extension %p " |
| "completed bytes xfer %u", request_ext, |
| vstor_packet->vm_srb.data_transfer_length); |
| |
| /* ASSERT(request_ext != NULL); */ |
| /* ASSERT(request_ext->request != NULL); */ |
| |
| request = request_ext->request; |
| |
| /* ASSERT(request->OnIOCompletion != NULL); */ |
| |
| /* Copy over the status...etc */ |
| request->status = vstor_packet->vm_srb.scsi_status; |
| |
| if (request->status != 0 || vstor_packet->vm_srb.srb_status != 1) { |
| DPRINT_WARN(STORVSC, |
| "cmd 0x%x scsi status 0x%x srb status 0x%x\n", |
| request->cdb[0], vstor_packet->vm_srb.scsi_status, |
| vstor_packet->vm_srb.srb_status); |
| } |
| |
| if ((request->status & 0xFF) == 0x02) { |
| /* CHECK_CONDITION */ |
| if (vstor_packet->vm_srb.srb_status & 0x80) { |
| /* autosense data available */ |
| DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " |
| "valid - len %d\n", request_ext, |
| vstor_packet->vm_srb.sense_info_length); |
| |
| /* ASSERT(vstor_packet->vm_srb.sense_info_length <= */ |
| /* request->SenseBufferSize); */ |
| memcpy(request->sense_buffer, |
| vstor_packet->vm_srb.sense_data, |
| vstor_packet->vm_srb.sense_info_length); |
| |
| request->sense_buffer_size = |
| vstor_packet->vm_srb.sense_info_length; |
| } |
| } |
| |
| /* TODO: */ |
| request->bytes_xfer = vstor_packet->vm_srb.data_transfer_length; |
| |
| request->on_io_completion(request); |
| |
| atomic_dec(&stor_device->num_outstanding_req); |
| |
| put_stor_device(device); |
| } |
| |
| static void stor_vsc_on_receive(struct hv_device *device, |
| struct vstor_packet *vstor_packet, |
| struct storvsc_request_extension *request_ext) |
| { |
| switch (vstor_packet->operation) { |
| case VSTOR_OPERATION_COMPLETE_IO: |
| DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION"); |
| stor_vsc_on_io_completion(device, vstor_packet, request_ext); |
| break; |
| case VSTOR_OPERATION_REMOVE_DEVICE: |
| DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION"); |
| /* TODO: */ |
| break; |
| |
| default: |
| DPRINT_INFO(STORVSC, "Unknown operation received - %d", |
| vstor_packet->operation); |
| break; |
| } |
| } |
| |
| static void stor_vsc_on_channel_callback(void *context) |
| { |
| struct hv_device *device = (struct hv_device *)context; |
| struct storvsc_device *stor_device; |
| u32 bytes_recvd; |
| u64 request_id; |
| unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; |
| struct storvsc_request_extension *request; |
| int ret; |
| |
| /* ASSERT(device); */ |
| |
| stor_device = must_get_stor_device(device); |
| if (!stor_device) { |
| DPRINT_ERR(STORVSC, "unable to get stor device..." |
| "device being destroyed?"); |
| return; |
| } |
| |
| do { |
| ret = vmbus_recvpacket(device->channel, packet, |
| ALIGN(sizeof(struct vstor_packet), 8), |
| &bytes_recvd, &request_id); |
| if (ret == 0 && bytes_recvd > 0) { |
| DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx", |
| bytes_recvd, request_id); |
| |
| /* ASSERT(bytes_recvd == |
| sizeof(struct vstor_packet)); */ |
| |
| request = (struct storvsc_request_extension *) |
| (unsigned long)request_id; |
| /* ASSERT(request);c */ |
| |
| /* if (vstor_packet.Flags & SYNTHETIC_FLAG) */ |
| if ((request == &stor_device->init_request) || |
| (request == &stor_device->reset_request)) { |
| /* DPRINT_INFO(STORVSC, |
| * "reset completion - operation " |
| * "%u status %u", |
| * vstor_packet.Operation, |
| * vstor_packet.Status); */ |
| |
| memcpy(&request->vstor_packet, packet, |
| sizeof(struct vstor_packet)); |
| request->wait_condition = 1; |
| wake_up(&request->wait_event); |
| } else { |
| stor_vsc_on_receive(device, |
| (struct vstor_packet *)packet, |
| request); |
| } |
| } else { |
| /* DPRINT_DBG(STORVSC, "nothing else to read..."); */ |
| break; |
| } |
| } while (1); |
| |
| put_stor_device(device); |
| return; |
| } |
| |
| static int stor_vsc_connect_to_vsp(struct hv_device *device) |
| { |
| struct vmstorage_channel_properties props; |
| struct storvsc_driver_object *stor_driver; |
| int ret; |
| |
| stor_driver = (struct storvsc_driver_object *)device->drv; |
| memset(&props, 0, sizeof(struct vmstorage_channel_properties)); |
| |
| /* Open the channel */ |
| ret = vmbus_open(device->channel, |
| stor_driver->ring_buffer_size, |
| stor_driver->ring_buffer_size, |
| (void *)&props, |
| sizeof(struct vmstorage_channel_properties), |
| stor_vsc_on_channel_callback, device); |
| |
| DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d", |
| props.path_id, props.target_id, props.max_transfer_bytes); |
| |
| if (ret != 0) { |
| DPRINT_ERR(STORVSC, "unable to open channel: %d", ret); |
| return -1; |
| } |
| |
| ret = stor_vsc_channel_init(device); |
| |
| return ret; |
| } |
| |
| /* |
| * stor_vsc_on_device_add - Callback when the device belonging to this driver |
| * is added |
| */ |
| static int stor_vsc_on_device_add(struct hv_device *device, |
| void *additional_info) |
| { |
| struct storvsc_device *stor_device; |
| /* struct vmstorage_channel_properties *props; */ |
| struct storvsc_device_info *device_info; |
| int ret = 0; |
| |
| device_info = (struct storvsc_device_info *)additional_info; |
| stor_device = alloc_stor_device(device); |
| if (!stor_device) { |
| ret = -1; |
| goto cleanup; |
| } |
| |
| /* Save the channel properties to our storvsc channel */ |
| /* props = (struct vmstorage_channel_properties *) |
| * channel->offerMsg.Offer.u.Standard.UserDefined; */ |
| |
| /* FIXME: */ |
| /* |
| * If we support more than 1 scsi channel, we need to set the |
| * port number here to the scsi channel but how do we get the |
| * scsi channel prior to the bus scan |
| */ |
| |
| /* storChannel->PortNumber = 0; |
| storChannel->PathId = props->PathId; |
| storChannel->TargetId = props->TargetId; */ |
| |
| stor_device->port_number = device_info->port_number; |
| /* Send it back up */ |
| ret = stor_vsc_connect_to_vsp(device); |
| |
| /* device_info->PortNumber = stor_device->PortNumber; */ |
| device_info->path_id = stor_device->path_id; |
| device_info->target_id = stor_device->target_id; |
| |
| DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n", |
| stor_device->port_number, stor_device->path_id, |
| stor_device->target_id); |
| |
| cleanup: |
| return ret; |
| } |
| |
| /* |
| * stor_vsc_on_device_remove - Callback when the our device is being removed |
| */ |
| static int stor_vsc_on_device_remove(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| |
| DPRINT_INFO(STORVSC, "disabling storage device (%p)...", |
| device->ext); |
| |
| stor_device = release_stor_device(device); |
| |
| /* |
| * At this point, all outbound traffic should be disable. We |
| * only allow inbound traffic (responses) to proceed so that |
| * outstanding requests can be completed. |
| */ |
| while (atomic_read(&stor_device->num_outstanding_req)) { |
| DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", |
| atomic_read(&stor_device->num_outstanding_req)); |
| udelay(100); |
| } |
| |
| DPRINT_INFO(STORVSC, "removing storage device (%p)...", |
| device->ext); |
| |
| stor_device = final_release_stor_device(device); |
| |
| DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", stor_device); |
| |
| /* Close the channel */ |
| vmbus_close(device->channel); |
| |
| free_stor_device(stor_device); |
| return 0; |
| } |
| |
| int stor_vsc_on_host_reset(struct hv_device *device) |
| { |
| struct storvsc_device *stor_device; |
| struct storvsc_request_extension *request; |
| struct vstor_packet *vstor_packet; |
| int ret; |
| |
| DPRINT_INFO(STORVSC, "resetting host adapter..."); |
| |
| stor_device = get_stor_device(device); |
| if (!stor_device) { |
| DPRINT_ERR(STORVSC, "unable to get stor device..." |
| "device being destroyed?"); |
| return -1; |
| } |
| |
| request = &stor_device->reset_request; |
| vstor_packet = &request->vstor_packet; |
| |
| init_waitqueue_head(&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; |
| |
| request->wait_condition = 0; |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)&stor_device->reset_request, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) { |
| DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d", |
| vstor_packet, ret); |
| goto cleanup; |
| } |
| |
| wait_event_timeout(request->wait_event, request->wait_condition, |
| msecs_to_jiffies(1000)); |
| if (request->wait_condition == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| DPRINT_INFO(STORVSC, "host adapter reset completed"); |
| |
| /* |
| * At this point, all outstanding requests in the adapter |
| * should have been flushed out and return to us |
| */ |
| |
| cleanup: |
| put_stor_device(device); |
| return ret; |
| } |
| |
| /* |
| * stor_vsc_on_io_request - Callback to initiate an I/O request |
| */ |
| static int stor_vsc_on_io_request(struct hv_device *device, |
| struct hv_storvsc_request *request) |
| { |
| struct storvsc_device *stor_device; |
| struct storvsc_request_extension *request_extension; |
| struct vstor_packet *vstor_packet; |
| int ret = 0; |
| |
| request_extension = |
| (struct storvsc_request_extension *)request->extension; |
| vstor_packet = &request_extension->vstor_packet; |
| stor_device = get_stor_device(device); |
| |
| DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, " |
| "Extension %p", device, stor_device, request, |
| request_extension); |
| |
| DPRINT_DBG(STORVSC, "req %p len %d bus %d, target %d, lun %d cdblen %d", |
| request, request->data_buffer.len, request->bus, |
| request->target_id, request->lun_id, request->cdb_len); |
| |
| if (!stor_device) { |
| DPRINT_ERR(STORVSC, "unable to get stor device..." |
| "device being destroyed?"); |
| return -2; |
| } |
| |
| /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, request->Cdb, |
| * request->CdbLen); */ |
| |
| request_extension->request = request; |
| request_extension->device = device; |
| |
| memset(vstor_packet, 0 , sizeof(struct vstor_packet)); |
| |
| vstor_packet->flags |= REQUEST_COMPLETION_FLAG; |
| |
| vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); |
| |
| vstor_packet->vm_srb.port_number = request->host; |
| vstor_packet->vm_srb.path_id = request->bus; |
| vstor_packet->vm_srb.target_id = request->target_id; |
| vstor_packet->vm_srb.lun = request->lun_id; |
| |
| vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE; |
| |
| /* Copy over the scsi command descriptor block */ |
| vstor_packet->vm_srb.cdb_length = request->cdb_len; |
| memcpy(&vstor_packet->vm_srb.cdb, request->cdb, request->cdb_len); |
| |
| vstor_packet->vm_srb.data_in = request->type; |
| vstor_packet->vm_srb.data_transfer_length = request->data_buffer.len; |
| |
| vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; |
| |
| DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, " |
| "lun %d senselen %d cdblen %d", |
| vstor_packet->vm_srb.length, |
| vstor_packet->vm_srb.port_number, |
| vstor_packet->vm_srb.path_id, |
| vstor_packet->vm_srb.target_id, |
| vstor_packet->vm_srb.lun, |
| vstor_packet->vm_srb.sense_info_length, |
| vstor_packet->vm_srb.cdb_length); |
| |
| if (request_extension->request->data_buffer.len) { |
| ret = vmbus_sendpacket_multipagebuffer(device->channel, |
| &request_extension->request->data_buffer, |
| vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)request_extension); |
| } else { |
| ret = vmbus_sendpacket(device->channel, vstor_packet, |
| sizeof(struct vstor_packet), |
| (unsigned long)request_extension, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| } |
| |
| if (ret != 0) { |
| DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d", |
| vstor_packet, ret); |
| } |
| |
| atomic_inc(&stor_device->num_outstanding_req); |
| |
| put_stor_device(device); |
| return ret; |
| } |
| |
| /* |
| * stor_vsc_on_cleanup - Perform any cleanup when the driver is removed |
| */ |
| static void stor_vsc_on_cleanup(struct hv_driver *driver) |
| { |
| } |
| |
| /* |
| * stor_vsc_initialize - Main entry point |
| */ |
| int stor_vsc_initialize(struct hv_driver *driver) |
| { |
| struct storvsc_driver_object *stor_driver; |
| |
| stor_driver = (struct storvsc_driver_object *)driver; |
| |
| DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%zd " |
| "sizeof(struct storvsc_request_extension)=%zd " |
| "sizeof(struct vstor_packet)=%zd, " |
| "sizeof(struct vmscsi_request)=%zd", |
| sizeof(struct hv_storvsc_request), |
| sizeof(struct storvsc_request_extension), |
| sizeof(struct vstor_packet), |
| sizeof(struct vmscsi_request)); |
| |
| /* Make sure we are at least 2 pages since 1 page is used for control */ |
| /* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */ |
| |
| driver->name = g_driver_name; |
| memcpy(&driver->dev_type, &gStorVscDeviceType, |
| sizeof(struct hv_guid)); |
| |
| stor_driver->request_ext_size = |
| sizeof(struct storvsc_request_extension); |
| |
| /* |
| * 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) |
| */ |
| stor_driver->max_outstanding_req_per_channel = |
| ((stor_driver->ring_buffer_size - PAGE_SIZE) / |
| ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + |
| sizeof(struct vstor_packet) + sizeof(u64), |
| sizeof(u64))); |
| |
| DPRINT_INFO(STORVSC, "max io %u, currently %u\n", |
| stor_driver->max_outstanding_req_per_channel, |
| STORVSC_MAX_IO_REQUESTS); |
| |
| /* Setup the dispatch table */ |
| stor_driver->base.dev_add = stor_vsc_on_device_add; |
| stor_driver->base.dev_rm = stor_vsc_on_device_remove; |
| stor_driver->base.cleanup = stor_vsc_on_cleanup; |
| |
| stor_driver->on_io_request = stor_vsc_on_io_request; |
| |
| return 0; |
| } |