diff options
Diffstat (limited to 'drivers/staging/hv/storvsc.c')
-rw-r--r-- | drivers/staging/hv/storvsc.c | 564 |
1 files changed, 0 insertions, 564 deletions
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c deleted file mode 100644 index 3029786..0000000 --- a/drivers/staging/hv/storvsc.c +++ /dev/null @@ -1,564 +0,0 @@ -/* - * 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> - * K. Y. Srinivasan <kys@microsoft.com> - * - */ -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/completion.h> -#include <linux/string.h> -#include <linux/slab.h> -#include <linux/mm.h> -#include <linux/delay.h> - -#include "hyperv.h" -#include "hyperv_storage.h" - - -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); - - init_waitqueue_head(&stor_device->waiting_to_drain); - stor_device->device = device; - device->ext = stor_device; - - return stor_device; -} - -static inline void free_stor_device(struct storvsc_device *device) -{ - kfree(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; -} - -/* 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; - - /* 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; - - /* 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 storvsc_channel_init(struct hv_device *device) -{ - struct storvsc_device *stor_device; - struct hv_storvsc_request *request; - struct vstor_packet *vstor_packet; - int ret, t; - - stor_device = get_stor_device(device); - if (!stor_device) - 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 hv_storvsc_request)); - init_completion(&request->wait_event); - vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; - vstor_packet->flags = REQUEST_COMPLETION_FLAG; - - DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION..."); - - 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) - 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; - - 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); - - 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) - goto cleanup; - - t = wait_for_completion_timeout(&request->wait_event, 5*HZ); - if (t == 0) { - ret = -ETIMEDOUT; - goto cleanup; - } - - /* TODO: Check returned version */ - if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || - vstor_packet->status != 0) - 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; - - 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) - goto cleanup; - - t = wait_for_completion_timeout(&request->wait_event, 5*HZ); - if (t == 0) { - ret = -ETIMEDOUT; - goto cleanup; - } - - /* TODO: Check returned version */ - if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || - vstor_packet->status != 0) - 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_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; - - 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) - 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; - - DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****"); - -cleanup: - put_stor_device(device); - return ret; -} - -static void storvsc_on_io_completion(struct hv_device *device, - struct vstor_packet *vstor_packet, - struct hv_storvsc_request *request) -{ - struct storvsc_device *stor_device; - struct vstor_packet *stor_pkt; - - stor_device = must_get_stor_device(device); - if (!stor_device) - return; - - stor_pkt = &request->vstor_packet; - - - /* Copy over the status...etc */ - stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; - stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; - stor_pkt->vm_srb.sense_info_length = - vstor_packet->vm_srb.sense_info_length; - - if (vstor_packet->vm_srb.scsi_status != 0 || - vstor_packet->vm_srb.srb_status != 1){ - DPRINT_WARN(STORVSC, - "cmd 0x%x scsi status 0x%x srb status 0x%x\n", - stor_pkt->vm_srb.cdb[0], - vstor_packet->vm_srb.scsi_status, - vstor_packet->vm_srb.srb_status); - } - - if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { - /* CHECK_CONDITION */ - if (vstor_packet->vm_srb.srb_status & 0x80) { - /* autosense data available */ - DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data " - "valid - len %d\n", request, - vstor_packet->vm_srb.sense_info_length); - - 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; - - request->on_io_completion(request); - - if (atomic_dec_and_test(&stor_device->num_outstanding_req) && - stor_device->drain_notify) - wake_up(&stor_device->waiting_to_drain); - - - put_stor_device(device); -} - -static void storvsc_on_receive(struct hv_device *device, - struct vstor_packet *vstor_packet, - struct hv_storvsc_request *request) -{ - switch (vstor_packet->operation) { - case VSTOR_OPERATION_COMPLETE_IO: - storvsc_on_io_completion(device, vstor_packet, request); - 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 storvsc_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 hv_storvsc_request *request; - int ret; - - - stor_device = must_get_stor_device(device); - if (!stor_device) - return; - - do { - ret = vmbus_recvpacket(device->channel, packet, - ALIGN(sizeof(struct vstor_packet), 8), - &bytes_recvd, &request_id); - if (ret == 0 && bytes_recvd > 0) { - - request = (struct hv_storvsc_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)); - complete(&request->wait_event); - } else { - storvsc_on_receive(device, - (struct vstor_packet *)packet, - request); - } - } else { - break; - } - } while (1); - - put_stor_device(device); - 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)); - - /* Open the channel */ - ret = vmbus_open(device->channel, - ring_size, - ring_size, - (void *)&props, - sizeof(struct vmstorage_channel_properties), - storvsc_on_channel_callback, device); - - if (ret != 0) - return -1; - - ret = storvsc_channel_init(device); - - return ret; -} - -int storvsc_dev_add(struct hv_device *device, - void *additional_info) -{ - struct storvsc_device *stor_device; - 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 */ - - /* 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 - */ - - stor_device->port_number = device_info->port_number; - /* Send it back up */ - ret = storvsc_connect_to_vsp(device, device_info->ring_buffer_size); - - device_info->path_id = stor_device->path_id; - device_info->target_id = stor_device->target_id; - -cleanup: - return ret; -} - -int storvsc_dev_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. - */ - - storvsc_wait_to_drain(stor_device); - - stor_device = final_release_stor_device(device); - - /* Close the channel */ - vmbus_close(device->channel); - - free_stor_device(stor_device); - return 0; -} - -int storvsc_do_io(struct hv_device *device, - struct hv_storvsc_request *request) -{ - struct storvsc_device *stor_device; - struct vstor_packet *vstor_packet; - int ret = 0; - - vstor_packet = &request->vstor_packet; - stor_device = get_stor_device(device); - - if (!stor_device) - return -2; - - - request->device = device; - - - vstor_packet->flags |= REQUEST_COMPLETION_FLAG; - - vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); - - - 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(device->channel, - &request->data_buffer, - vstor_packet, - sizeof(struct vstor_packet), - (unsigned long)request); - } else { - 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) - return ret; - - atomic_inc(&stor_device->num_outstanding_req); - - put_stor_device(device); - return ret; -} - -/* - * The channel properties uniquely specify how the device is to be - * presented to the guest. Map this information for use by the block - * driver. For Linux guests on Hyper-V, we emulate a scsi HBA in the guest - * (storvsc_drv) and so scsi devices in the guest are handled by - * native upper level Linux drivers. Consequently, Hyper-V - * block driver, while being a generic block driver, presently does not - * deal with anything other than devices that would need to be presented - * to the guest as an IDE disk. - * - * This function maps the channel properties as embedded in the input - * parameter device_info onto information necessary to register the - * corresponding block device. - * - * Currently, there is no way to stop the emulation of the block device - * on the host side. And so, to prevent the native IDE drivers in Linux - * from taking over these devices (to be managedby Hyper-V block - * driver), we will take over if need be the major of the IDE controllers. - * - */ - -int storvsc_get_major_info(struct storvsc_device_info *device_info, - struct storvsc_major_info *major_info) -{ - static bool ide0_registered; - static bool ide1_registered; - - /* - * For now we only support IDE disks. - */ - major_info->devname = "ide"; - major_info->diskname = "hd"; - - if (device_info->path_id) { - major_info->major = 22; - if (!ide1_registered) { - major_info->do_register = true; - ide1_registered = true; - } else - major_info->do_register = false; - - if (device_info->target_id) - major_info->index = 3; - else - major_info->index = 2; - - return 0; - } else { - major_info->major = 3; - if (!ide0_registered) { - major_info->do_register = true; - ide0_registered = true; - } else - major_info->do_register = false; - - if (device_info->target_id) - major_info->index = 1; - else - major_info->index = 0; - - return 0; - } - - return -ENODEV; -} - |