diff options
Diffstat (limited to 'drivers/staging/hv/storvsc_drv.c')
| -rw-r--r-- | drivers/staging/hv/storvsc_drv.c | 1586 |
1 files changed, 0 insertions, 1586 deletions
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c deleted file mode 100644 index eb853f71089a..000000000000 --- a/drivers/staging/hv/storvsc_drv.c +++ /dev/null @@ -1,1586 +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/wait.h> -#include <linux/sched.h> -#include <linux/completion.h> -#include <linux/string.h> -#include <linux/mm.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/hyperv.h> -#include <linux/mempool.h> -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_host.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_tcq.h> -#include <scsi/scsi_eh.h> -#include <scsi/scsi_devinfo.h> -#include <scsi/scsi_dbg.h> - - -#define STORVSC_MIN_BUF_NR 64 -#define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) -static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; - -module_param(storvsc_ringbuffer_size, int, S_IRUGO); -MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); - -/* to alert the user that structure sizes may be mismatched even though the */ -/* protocol versions match. */ - - -#define REVISION_STRING(REVISION_) #REVISION_ -#define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \ - do { \ - char *revision_string \ - = REVISION_STRING($Rev : 6 $) + 6; \ - RESULT_LVALUE_ = 0; \ - while (*revision_string >= '0' \ - && *revision_string <= '9') { \ - RESULT_LVALUE_ *= 10; \ - RESULT_LVALUE_ += *revision_string - '0'; \ - revision_string++; \ - } \ - } while (0) - -/* Major/minor macros. Minor version is in LSB, meaning that earlier flat */ -/* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */ -#define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff) -#define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff) -#define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ - (((MINOR_) & 0xff))) -#define VMSTOR_INVALID_PROTOCOL_VERSION (-1) - -/* Version history: */ -/* V1 Beta 0.1 */ -/* V1 RC < 2008/1/31 1.0 */ -/* V1 RC > 2008/1/31 2.0 */ -#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(4, 2) - - - - -/* This will get replaced with the max transfer length that is possible on */ -/* the host adapter. */ -/* The max transfer length will be published when we offer a vmbus channel. */ -#define MAX_TRANSFER_LENGTH 0x40000 -#define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \ - sizeof(struct vstor_packet) + \ - sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE))) - - -/* Packet structure describing virtual storage requests. */ -enum vstor_packet_operation { - VSTOR_OPERATION_COMPLETE_IO = 1, - VSTOR_OPERATION_REMOVE_DEVICE = 2, - VSTOR_OPERATION_EXECUTE_SRB = 3, - VSTOR_OPERATION_RESET_LUN = 4, - VSTOR_OPERATION_RESET_ADAPTER = 5, - VSTOR_OPERATION_RESET_BUS = 6, - VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, - VSTOR_OPERATION_END_INITIALIZATION = 8, - VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, - VSTOR_OPERATION_QUERY_PROPERTIES = 10, - VSTOR_OPERATION_ENUMERATE_BUS = 11, - VSTOR_OPERATION_MAXIMUM = 11 -}; - -/* - * Platform neutral description of a scsi request - - * this remains the same across the write regardless of 32/64 bit - * note: it's patterned off the SCSI_PASS_THROUGH structure - */ -#define CDB16GENERIC_LENGTH 0x10 - -#ifndef SENSE_BUFFER_SIZE -#define SENSE_BUFFER_SIZE 0x12 -#endif - -#define MAX_DATA_BUF_LEN_WITH_PADDING 0x14 - -struct vmscsi_request { - unsigned short length; - unsigned char srb_status; - unsigned char scsi_status; - - unsigned char port_number; - unsigned char path_id; - unsigned char target_id; - unsigned char lun; - - unsigned char cdb_length; - unsigned char sense_info_length; - unsigned char data_in; - unsigned char reserved; - - unsigned int data_transfer_length; - - union { - unsigned char cdb[CDB16GENERIC_LENGTH]; - unsigned char sense_data[SENSE_BUFFER_SIZE]; - unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING]; - }; -} __attribute((packed)); - - -/* - * This structure is sent during the intialization phase to get the different - * properties of the channel. - */ -struct vmstorage_channel_properties { - unsigned short protocol_version; - unsigned char path_id; - unsigned char target_id; - - /* Note: port number is only really known on the client side */ - unsigned int port_number; - unsigned int flags; - unsigned int max_transfer_bytes; - - /* This id is unique for each channel and will correspond with */ - /* vendor specific data in the inquirydata */ - unsigned long long unique_id; -} __packed; - -/* This structure is sent during the storage protocol negotiations. */ -struct vmstorage_protocol_version { - /* Major (MSW) and minor (LSW) version numbers. */ - unsigned short major_minor; - - /* - * Revision number is auto-incremented whenever this file is changed - * (See FILL_VMSTOR_REVISION macro above). Mismatch does not - * definitely indicate incompatibility--but it does indicate mismatched - * builds. - */ - unsigned short revision; -} __packed; - -/* Channel Property Flags */ -#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 -#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 - -struct vstor_packet { - /* Requested operation type */ - enum vstor_packet_operation operation; - - /* Flags - see below for values */ - unsigned int flags; - - /* Status of the request returned from the server side. */ - unsigned int status; - - /* Data payload area */ - union { - /* - * Structure used to forward SCSI commands from the - * client to the server. - */ - struct vmscsi_request vm_srb; - - /* Structure used to query channel properties. */ - struct vmstorage_channel_properties storage_channel_properties; - - /* Used during version negotiations. */ - struct vmstorage_protocol_version version; - }; -} __packed; - -/* Packet flags */ -/* - * This flag indicates that the server should send back a completion for this - * packet. - */ -#define REQUEST_COMPLETION_FLAG 0x1 - -/* This is the set of flags that the vsc can set in any packets it sends */ -#define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG) - - -/* Defines */ - -#define STORVSC_MAX_IO_REQUESTS 128 - -/* - * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In - * reality, the path/target is not used (ie always set to 0) so our - * scsi host adapter essentially has 1 bus with 1 target that contains - * up to 256 luns. - */ -#define STORVSC_MAX_LUNS_PER_TARGET 64 -#define STORVSC_MAX_TARGETS 1 -#define STORVSC_MAX_CHANNELS 1 -#define STORVSC_MAX_CMD_LEN 16 - -/* Matches Windows-end */ -enum storvsc_request_type { - WRITE_TYPE, - READ_TYPE, - UNKNOWN_TYPE, -}; - - -struct hv_storvsc_request { - struct hv_device *device; - - /* Synchronize the request/response if needed */ - struct completion wait_event; - - unsigned char *sense_buffer; - void *context; - void (*on_io_completion)(struct hv_storvsc_request *request); - struct hv_multipage_buffer data_buffer; - - struct vstor_packet vstor_packet; -}; - - -/* A storvsc device is a device object that contains a vmbus channel */ -struct storvsc_device { - struct hv_device *device; - - bool destroy; - bool drain_notify; - atomic_t num_outstanding_req; - struct Scsi_Host *host; - - wait_queue_head_t waiting_to_drain; - - /* - * 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; - - /* Used for vsc/vsp channel reset process */ - struct hv_storvsc_request init_request; - struct hv_storvsc_request reset_request; -}; - -struct stor_mem_pools { - struct kmem_cache *request_pool; - mempool_t *request_mempool; -}; - -struct hv_host_device { - struct hv_device *dev; - unsigned int port; - unsigned char path; - unsigned char target; -}; - -struct storvsc_cmd_request { - struct list_head entry; - struct scsi_cmnd *cmd; - - unsigned int bounce_sgl_count; - struct scatterlist *bounce_sgl; - - struct hv_storvsc_request request; -}; - -struct storvsc_scan_work { - struct work_struct work; - struct Scsi_Host *host; - uint lun; -}; - -static void storvsc_bus_scan(struct work_struct *work) -{ - struct storvsc_scan_work *wrk; - int id, order_id; - - wrk = container_of(work, struct storvsc_scan_work, work); - for (id = 0; id < wrk->host->max_id; ++id) { - if (wrk->host->reverse_ordering) - order_id = wrk->host->max_id - id - 1; - else - order_id = id; - - scsi_scan_target(&wrk->host->shost_gendev, 0, - order_id, SCAN_WILD_CARD, 1); - } - kfree(wrk); -} - -static void storvsc_remove_lun(struct work_struct *work) -{ - struct storvsc_scan_work *wrk; - struct scsi_device *sdev; - - wrk = container_of(work, struct storvsc_scan_work, work); - if (!scsi_host_get(wrk->host)) - goto done; - - sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); - - if (sdev) { - scsi_remove_device(sdev); - scsi_device_put(sdev); - } - scsi_host_put(wrk->host); - -done: - kfree(wrk); -} - -static inline struct storvsc_device *get_out_stor_device( - struct hv_device *device) -{ - struct storvsc_device *stor_device; - - stor_device = hv_get_drvdata(device); - - if (stor_device && stor_device->destroy) - stor_device = NULL; - - return stor_device; -} - - -static inline void storvsc_wait_to_drain(struct storvsc_device *dev) -{ - dev->drain_notify = true; - wait_event(dev->waiting_to_drain, - atomic_read(&dev->num_outstanding_req) == 0); - dev->drain_notify = false; -} - -static inline struct storvsc_device *get_in_stor_device( - struct hv_device *device) -{ - struct storvsc_device *stor_device; - - stor_device = hv_get_drvdata(device); - - if (!stor_device) - goto get_in_err; - - /* - * If the device is being destroyed; allow incoming - * traffic only to cleanup outstanding requests. - */ - - if (stor_device->destroy && - (atomic_read(&stor_device->num_outstanding_req) == 0)) - stor_device = NULL; - -get_in_err: - return stor_device; - -} - -static 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_out_stor_device(device); - if (!stor_device) - return -ENODEV; - - request = &stor_device->init_request; - vstor_packet = &request->vstor_packet; - - /* - * Now, initiate the vsc/vsp initialization protocol on the open - * channel - */ - memset(request, 0, sizeof(struct hv_storvsc_request)); - init_completion(&request->wait_event); - vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; - vstor_packet->flags = REQUEST_COMPLETION_FLAG; - - ret = vmbus_sendpacket(device->channel, vstor_packet, - sizeof(struct vstor_packet), - (unsigned long)request, - VM_PKT_DATA_INBAND, - VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); - if (ret != 0) - goto cleanup; - - t = wait_for_completion_timeout(&request->wait_event, 5*HZ); - if (t == 0) { - ret = -ETIMEDOUT; - goto cleanup; - } - - if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || - vstor_packet->status != 0) - goto cleanup; - - - /* reuse the packet for version range supported */ - memset(vstor_packet, 0, sizeof(struct vstor_packet)); - vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; - vstor_packet->flags = REQUEST_COMPLETION_FLAG; - - vstor_packet->version.major_minor = 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; - } - - if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || - vstor_packet->status != 0) - goto cleanup; - - - memset(vstor_packet, 0, sizeof(struct vstor_packet)); - vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; - vstor_packet->flags = REQUEST_COMPLETION_FLAG; - 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; - } - - 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; - - 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; - - -cleanup: - 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 = hv_get_drvdata(device); - stor_pkt = &request->vstor_packet; - - /* - * The current SCSI handling on the host side does - * not correctly handle: - * INQUIRY command with page code parameter set to 0x80 - * MODE_SENSE command with cmd[2] == 0x1c - * - * Setup srb and scsi status so this won't be fatal. - * We do this so we can distinguish truly fatal failues - * (srb status == 0x4) and off-line the device in that case. - */ - - if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || - (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { - vstor_packet->vm_srb.scsi_status = 0; - vstor_packet->vm_srb.srb_status = 0x1; - } - - - /* 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){ - dev_warn(&device->device, - "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 */ - dev_warn(&device->device, - "stor 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); - - -} - -static void storvsc_on_receive(struct hv_device *device, - struct vstor_packet *vstor_packet, - struct hv_storvsc_request *request) -{ - struct storvsc_scan_work *work; - struct storvsc_device *stor_device; - - switch (vstor_packet->operation) { - case VSTOR_OPERATION_COMPLETE_IO: - storvsc_on_io_completion(device, vstor_packet, request); - break; - - case VSTOR_OPERATION_REMOVE_DEVICE: - case VSTOR_OPERATION_ENUMERATE_BUS: - stor_device = get_in_stor_device(device); - work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); - if (!work) - return; - - INIT_WORK(&work->work, storvsc_bus_scan); - work->host = stor_device->host; - schedule_work(&work->work); - break; - - default: - break; - } -} - -static void storvsc_on_channel_callback(void *context) -{ - struct 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 = get_in_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); - - 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 ret; - - ret = storvsc_channel_init(device); - - return ret; -} - -static int storvsc_dev_remove(struct hv_device *device) -{ - struct storvsc_device *stor_device; - unsigned long flags; - - stor_device = hv_get_drvdata(device); - - spin_lock_irqsave(&device->channel->inbound_lock, flags); - stor_device->destroy = true; - spin_unlock_irqrestore(&device->channel->inbound_lock, flags); - - /* - * At this point, all outbound traffic should be disable. We - * only allow inbound traffic (responses) to proceed so that - * outstanding requests can be completed. - */ - - storvsc_wait_to_drain(stor_device); - - /* - * Since we have already drained, we don't need to busy wait - * as was done in final_release_stor_device() - * Note that we cannot set the ext pointer to NULL until - * we have drained - to drain the outgoing packets, we need to - * allow incoming packets. - */ - spin_lock_irqsave(&device->channel->inbound_lock, flags); - hv_set_drvdata(device, NULL); - spin_unlock_irqrestore(&device->channel->inbound_lock, flags); - - /* Close the channel */ - vmbus_close(device->channel); - - kfree(stor_device); - return 0; -} - -static int storvsc_do_io(struct hv_device *device, - struct 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_out_stor_device(device); - - if (!stor_device) - return -ENODEV; - - - 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); - - return ret; -} - -static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path) -{ - *target = - dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4]; - - *path = - dev->dev_instance.b[3] << 24 | - dev->dev_instance.b[2] << 16 | - dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0]; -} - - -static int storvsc_device_alloc(struct scsi_device *sdevice) -{ - struct stor_mem_pools *memp; - int number = STORVSC_MIN_BUF_NR; - - memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); - if (!memp) - return -ENOMEM; - - memp->request_pool = - kmem_cache_create(dev_name(&sdevice->sdev_dev), - sizeof(struct storvsc_cmd_request), 0, - SLAB_HWCACHE_ALIGN, NULL); - - if (!memp->request_pool) - goto err0; - - memp->request_mempool = mempool_create(number, mempool_alloc_slab, - mempool_free_slab, - memp->request_pool); - - if (!memp->request_mempool) - goto err1; - - sdevice->hostdata = memp; - - return 0; - -err1: - kmem_cache_destroy(memp->request_pool); - -err0: - kfree(memp); - return -ENOMEM; -} - -static void storvsc_device_destroy(struct scsi_device *sdevice) -{ - struct stor_mem_pools *memp = sdevice->hostdata; - - mempool_destroy(memp->request_mempool); - kmem_cache_destroy(memp->request_pool); - kfree(memp); - sdevice->hostdata = NULL; -} - -static int storvsc_device_configure(struct scsi_device *sdevice) -{ - scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, - STORVSC_MAX_IO_REQUESTS); - - blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); - - blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); - - return 0; -} - -static void destroy_bounce_buffer(struct scatterlist *sgl, - unsigned int sg_count) -{ - int i; - struct page *page_buf; - - for (i = 0; i < sg_count; i++) { - page_buf = sg_page((&sgl[i])); - if (page_buf != NULL) - __free_page(page_buf); - } - - kfree(sgl); -} - -static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) -{ - int i; - - /* No need to check */ - if (sg_count < 2) - return -1; - - /* We have at least 2 sg entries */ - for (i = 0; i < sg_count; i++) { - if (i == 0) { - /* make sure 1st one does not have hole */ - if (sgl[i].offset + sgl[i].length != PAGE_SIZE) - return i; - } else if (i == sg_count - 1) { - /* make sure last one does not have hole */ - if (sgl[i].offset != 0) - return i; - } else { - /* make sure no hole in the middle */ - if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) - return i; - } - } - return -1; -} - -static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, - unsigned int sg_count, - unsigned int len, - int write) -{ - int i; - int num_pages; - struct scatterlist *bounce_sgl; - struct page *page_buf; - unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); - - num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; - - bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); - if (!bounce_sgl) - return NULL; - - for (i = 0; i < num_pages; i++) { - page_buf = alloc_page(GFP_ATOMIC); - if (!page_buf) - goto cleanup; - sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); - } - - return bounce_sgl; - -cleanup: - destroy_bounce_buffer(bounce_sgl, num_pages); - return NULL; -} - - -/* Assume the original sgl has enough room */ -static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, - struct scatterlist *bounce_sgl, - unsigned int orig_sgl_count, - unsigned int bounce_sgl_count) -{ - int i; - int j = 0; - unsigned long src, dest; - unsigned int srclen, destlen, copylen; - unsigned int total_copied = 0; - unsigned long bounce_addr = 0; - unsigned long dest_addr = 0; - unsigned long flags; - - local_irq_save(flags); - - for (i = 0; i < orig_sgl_count; i++) { - dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), - KM_IRQ0) + orig_sgl[i].offset; - dest = dest_addr; - destlen = orig_sgl[i].length; - - if (bounce_addr == 0) - bounce_addr = - (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), - KM_IRQ0); - - while (destlen) { - src = bounce_addr + bounce_sgl[j].offset; - srclen = bounce_sgl[j].length - bounce_sgl[j].offset; - - copylen = min(srclen, destlen); - memcpy((void *)dest, (void *)src, copylen); - - total_copied += copylen; - bounce_sgl[j].offset += copylen; - destlen -= copylen; - dest += copylen; - - if (bounce_sgl[j].offset == bounce_sgl[j].length) { - /* full */ - kunmap_atomic((void *)bounce_addr, KM_IRQ0); - j++; - - /* - * It is possible that the number of elements - * in the bounce buffer may not be equal to - * the number of elements in the original - * scatter list. Handle this correctly. - */ - - if (j == bounce_sgl_count) { - /* - * We are done; cleanup and return. - */ - kunmap_atomic((void *)(dest_addr - - orig_sgl[i].offset), - KM_IRQ0); - local_irq_restore(flags); - return total_copied; - } - - /* if we need to use another bounce buffer */ - if (destlen || i != orig_sgl_count - 1) - bounce_addr = - (unsigned long)kmap_atomic( - sg_page((&bounce_sgl[j])), KM_IRQ0); - } else if (destlen == 0 && i == orig_sgl_count - 1) { - /* unmap the last bounce that is < PAGE_SIZE */ - kunmap_atomic((void *)bounce_addr, KM_IRQ0); - } - } - - kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), - KM_IRQ0); - } - - local_irq_restore(flags); - - return total_copied; -} - - -/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ -static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, - struct scatterlist *bounce_sgl, - unsigned int orig_sgl_count) -{ - int i; - int j = 0; - unsigned long src, dest; - unsigned int srclen, destlen, copylen; - unsigned int total_copied = 0; - unsigned long bounce_addr = 0; - unsigned long src_addr = 0; - unsigned long flags; - - local_irq_save(flags); - - for (i = 0; i < orig_sgl_count; i++) { - src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), - KM_IRQ0) + orig_sgl[i].offset; - src = src_addr; - srclen = orig_sgl[i].length; - - if (bounce_addr == 0) - bounce_addr = - (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), - KM_IRQ0); - - while (srclen) { - /* assume bounce offset always == 0 */ - dest = bounce_addr + bounce_sgl[j].length; - destlen = PAGE_SIZE - bounce_sgl[j].length; - - copylen = min(srclen, destlen); - memcpy((void *)dest, (void *)src, copylen); - - total_copied += copylen; - bounce_sgl[j].length += copylen; - srclen -= copylen; - src += copylen; - - if (bounce_sgl[j].length == PAGE_SIZE) { - /* full..move to next entry */ - kunmap_atomic((void *)bounce_addr, KM_IRQ0); - j++; - - /* if we need to use another bounce buffer */ - if (srclen || i != orig_sgl_count - 1) - bounce_addr = - (unsigned long)kmap_atomic( - sg_page((&bounce_sgl[j])), KM_IRQ0); - - } else if (srclen == 0 && i == orig_sgl_count - 1) { - /* unmap the last bounce that is < PAGE_SIZE */ - kunmap_atomic((void *)bounce_addr, KM_IRQ0); - } - } - - kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); - } - - local_irq_restore(flags); - - return total_copied; -} - - -static int storvsc_remove(struct hv_device *dev) -{ - struct storvsc_device *stor_device = hv_get_drvdata(dev); - struct Scsi_Host *host = stor_device->host; - - scsi_remove_host(host); - - scsi_host_put(host); - - storvsc_dev_remove(dev); - - return 0; -} - - -static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, - sector_t capacity, int *info) -{ - sector_t nsect = capacity; - sector_t cylinders = nsect; - int heads, sectors_pt; - - /* - * We are making up these values; let us keep it simple. - */ - heads = 0xff; - sectors_pt = 0x3f; /* Sectors per track */ - sector_div(cylinders, heads * sectors_pt); - if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) - cylinders = 0xffff; - - info[0] = heads; - info[1] = sectors_pt; - info[2] = (int)cylinders; - - return 0; -} - -static int storvsc_host_reset(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_out_stor_device(device); - if (!stor_device) - return FAILED; - - request = &stor_device->reset_request; - vstor_packet = &request->vstor_packet; - - init_completion(&request->wait_event); - - vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; - vstor_packet->flags = REQUEST_COMPLETION_FLAG; - vstor_packet->vm_srb.path_id = stor_device->path_id; - - ret = vmbus_sendpacket(device->channel, vstor_packet, - sizeof(struct vstor_packet), - (unsigned long)&stor_device->reset_request, - VM_PKT_DATA_INBAND, - VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); - if (ret != 0) - return FAILED; - - t = wait_for_completion_timeout(&request->wait_event, 5*HZ); - if (t == 0) - return TIMEOUT_ERROR; - - - /* - * At this point, all outstanding requests in the adapter - * should have been flushed out and return to us - */ - - return SUCCESS; -} - - -/* - * storvsc_host_reset_handler - Reset the scsi HBA - */ -static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) -{ - struct hv_host_device *host_dev = shost_priv(scmnd->device->host); - struct hv_device *dev = host_dev->dev; - - return storvsc_host_reset(dev); -} - - -/* - * storvsc_command_completion - Command completion processing - */ -static void storvsc_command_completion(struct hv_storvsc_request *request) -{ - struct storvsc_cmd_request *cmd_request = - (struct storvsc_cmd_request *)request->context; - struct scsi_cmnd *scmnd = cmd_request->cmd; - struct hv_host_device *host_dev = shost_priv(scmnd->device->host); - void (*scsi_done_fn)(struct scsi_cmnd *); - struct scsi_sense_hdr sense_hdr; - struct vmscsi_request *vm_srb; - struct storvsc_scan_work *wrk; - struct stor_mem_pools *memp = scmnd->device->hostdata; - - vm_srb = &request->vstor_packet.vm_srb; - if (cmd_request->bounce_sgl_count) { - if (vm_srb->data_in == READ_TYPE) - copy_from_bounce_buffer(scsi_sglist(scmnd), - cmd_request->bounce_sgl, - scsi_sg_count(scmnd), - cmd_request->bounce_sgl_count); - destroy_bounce_buffer(cmd_request->bounce_sgl, - cmd_request->bounce_sgl_count); - } - - /* - * If there is an error; offline the device since all - * error recovery strategies would have already been - * deployed on the host side. - */ - if (vm_srb->srb_status == 0x4) - scmnd->result = DID_TARGET_FAILURE << 16; - else - scmnd->result = vm_srb->scsi_status; - - /* - * If the LUN is invalid; remove the device. - */ - if (vm_srb->srb_status == 0x20) { - struct storvsc_device *stor_dev; - struct hv_device *dev = host_dev->dev; - struct Scsi_Host *host; - - stor_dev = get_in_stor_device(dev); - host = stor_dev->host; - - wrk = kmalloc(sizeof(struct storvsc_scan_work), - GFP_ATOMIC); - if (!wrk) { - scmnd->result = DID_TARGET_FAILURE << 16; - } else { - wrk->host = host; - wrk->lun = vm_srb->lun; - INIT_WORK(&wrk->work, storvsc_remove_lun); - schedule_work(&wrk->work); - } - } - - if (scmnd->result) { - if (scsi_normalize_sense(scmnd->sense_buffer, - SCSI_SENSE_BUFFERSIZE, &sense_hdr)) - scsi_print_sense_hdr("storvsc", &sense_hdr); - } - - scsi_set_resid(scmnd, - request->data_buffer.len - - vm_srb->data_transfer_length); - - scsi_done_fn = scmnd->scsi_done; - - scmnd->host_scribble = NULL; - scmnd->scsi_done = NULL; - - scsi_done_fn(scmnd); - - mempool_free(cmd_request, memp->request_mempool); -} - -static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd) -{ - bool allowed = true; - u8 scsi_op = scmnd->cmnd[0]; - - switch (scsi_op) { - /* smartd sends this command, which will offline the device */ - case SET_WINDOW: - scmnd->result = ILLEGAL_REQUEST << 16; - allowed = false; - break; - default: - break; - } - return allowed; -} - -/* - * storvsc_queuecommand - Initiate command processing - */ -static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) -{ - int ret; - struct hv_host_device *host_dev = shost_priv(host); - struct hv_device *dev = host_dev->dev; - struct hv_storvsc_request *request; - struct storvsc_cmd_request *cmd_request; - unsigned int request_size = 0; - int i; - struct scatterlist *sgl; - unsigned int sg_count = 0; - struct vmscsi_request *vm_srb; - struct stor_mem_pools *memp = scmnd->device->hostdata; - - if (storvsc_check_scsi_cmd(scmnd) == false) { - scmnd->scsi_done(scmnd); - return 0; - } - - /* If retrying, no need to prep the cmd */ - if (scmnd->host_scribble) { - - cmd_request = - (struct storvsc_cmd_request *)scmnd->host_scribble; - - goto retry_request; - } - - request_size = sizeof(struct storvsc_cmd_request); - - cmd_request = mempool_alloc(memp->request_mempool, - GFP_ATOMIC); - if (!cmd_request) - return SCSI_MLQUEUE_DEVICE_BUSY; - - memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); - - /* Setup the cmd request */ - cmd_request->bounce_sgl_count = 0; - cmd_request->bounce_sgl = NULL; - cmd_request->cmd = scmnd; - - scmnd->host_scribble = (unsigned char *)cmd_request; - - request = &cmd_request->request; - vm_srb = &request->vstor_packet.vm_srb; - - - /* Build the SRB */ - switch (scmnd->sc_data_direction) { - case DMA_TO_DEVICE: - vm_srb->data_in = WRITE_TYPE; - break; - case DMA_FROM_DEVICE: - vm_srb->data_in = READ_TYPE; - break; - default: - vm_srb->data_in = UNKNOWN_TYPE; - break; - } - - request->on_io_completion = storvsc_command_completion; - request->context = cmd_request;/* scmnd; */ - - vm_srb->port_number = host_dev->port; - vm_srb->path_id = scmnd->device->channel; - vm_srb->target_id = scmnd->device->id; - vm_srb->lun = scmnd->device->lun; - - vm_srb->cdb_length = scmnd->cmd_len; - - memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); - - request->sense_buffer = scmnd->sense_buffer; - - - request->data_buffer.len = scsi_bufflen(scmnd); - if (scsi_sg_count(scmnd)) { - sgl = (struct scatterlist *)scsi_sglist(scmnd); - sg_count = scsi_sg_count(scmnd); - - /* check if we need to bounce the sgl */ - if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { - cmd_request->bounce_sgl = - create_bounce_buffer(sgl, scsi_sg_count(scmnd), - scsi_bufflen(scmnd), - vm_srb->data_in); - if (!cmd_request->bounce_sgl) { - scmnd->host_scribble = NULL; - mempool_free(cmd_request, - memp->request_mempool); - - return SCSI_MLQUEUE_HOST_BUSY; - } - - cmd_request->bounce_sgl_count = - ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> - PAGE_SHIFT; - - if (vm_srb->data_in == WRITE_TYPE) - copy_to_bounce_buffer(sgl, - cmd_request->bounce_sgl, - scsi_sg_count(scmnd)); - - sgl = cmd_request->bounce_sgl; - sg_count = cmd_request->bounce_sgl_count; - } - - request->data_buffer.offset = sgl[0].offset; - - for (i = 0; i < sg_count; i++) - request->data_buffer.pfn_array[i] = - page_to_pfn(sg_page((&sgl[i]))); - - } else if (scsi_sglist(scmnd)) { - request->data_buffer.offset = - virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); - request->data_buffer.pfn_array[0] = - virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; - } - -retry_request: - /* Invokes the vsc to start an IO */ - ret = storvsc_do_io(dev, &cmd_request->request); - - if (ret == -EAGAIN) { - /* no more space */ - - if (cmd_request->bounce_sgl_count) - destroy_bounce_buffer(cmd_request->bounce_sgl, - cmd_request->bounce_sgl_count); - - mempool_free(cmd_request, memp->request_mempool); - - scmnd->host_scribble = NULL; - - ret = SCSI_MLQUEUE_DEVICE_BUSY; - } - - return ret; -} - -/* Scsi driver */ -static struct scsi_host_template scsi_driver = { - .module = THIS_MODULE, - .name = "storvsc_host_t", - .bios_param = storvsc_get_chs, - .queuecommand = storvsc_queuecommand, - .eh_host_reset_handler = storvsc_host_reset_handler, - .slave_alloc = storvsc_device_alloc, - .slave_destroy = storvsc_device_destroy, - .slave_configure = storvsc_device_configure, - .cmd_per_lun = 1, - /* 64 max_queue * 1 target */ - .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, - .this_id = -1, - /* no use setting to 0 since ll_blk_rw reset it to 1 */ - /* currently 32 */ - .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, - .use_clustering = DISABLE_CLUSTERING, - /* Make sure we dont get a sg segment crosses a page boundary */ - .dma_boundary = PAGE_SIZE-1, -}; - -enum { - SCSI_GUID, - IDE_GUID, -}; - -static const struct hv_vmbus_device_id id_table[] = { - /* SCSI guid */ - { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, - 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) - .driver_data = SCSI_GUID }, - /* IDE guid */ - { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, - 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) - .driver_data = IDE_GUID }, - { }, -}; - -MODULE_DEVICE_TABLE(vmbus, id_table); - - -/* - * storvsc_probe - Add a new device for this driver - */ - -static int storvsc_probe(struct hv_device *device, - const struct hv_vmbus_device_id *dev_id) -{ - int ret; - struct Scsi_Host *host; - struct hv_host_device *host_dev; - bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); - int path = 0; - int target = 0; - struct storvsc_device *stor_device; - - host = scsi_host_alloc(&scsi_driver, - sizeof(struct hv_host_device)); - if (!host) - return -ENOMEM; - - host_dev = shost_priv(host); - memset(host_dev, 0, sizeof(struct hv_host_device)); - - host_dev->port = host->host_no; - host_dev->dev = device; - - - stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); - if (!stor_device) { - ret = -ENOMEM; - goto err_out0; - } - - stor_device->destroy = false; - init_waitqueue_head(&stor_device->waiting_to_drain); - stor_device->device = device; - stor_device->host = host; - hv_set_drvdata(device, stor_device); - - stor_device->port_number = host->host_no; - ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); - if (ret) - goto err_out1; - - if (dev_is_ide) - storvsc_get_ide_info(device, &target, &path); - - host_dev->path = stor_device->path_id; - host_dev->target = stor_device->target_id; - - /* max # of devices per target */ - host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; - /* max # of targets per channel */ - host->max_id = STORVSC_MAX_TARGETS; - /* max # of channels */ - host->max_channel = STORVSC_MAX_CHANNELS - 1; - /* max cmd length */ - host->max_cmd_len = STORVSC_MAX_CMD_LEN; - - /* Register the HBA and start the scsi bus scan */ - ret = scsi_add_host(host, &device->device); - if (ret != 0) - goto err_out2; - - if (!dev_is_ide) { - scsi_scan_host(host); - return 0; - } - ret = scsi_add_device(host, 0, target, 0); - if (ret) { - scsi_remove_host(host); - goto err_out2; - } - return 0; - -err_out2: - /* - * Once we have connected with the host, we would need to - * to invoke storvsc_dev_remove() to rollback this state and - * this call also frees up the stor_device; hence the jump around - * err_out1 label. - */ - storvsc_dev_remove(device); - goto err_out0; - -err_out1: - kfree(stor_device); - -err_out0: - scsi_host_put(host); - return ret; -} - -/* The one and only one */ - -static struct hv_driver storvsc_drv = { - .name = KBUILD_MODNAME, - .id_table = id_table, - .probe = storvsc_probe, - .remove = storvsc_remove, -}; - -static int __init storvsc_drv_init(void) -{ - u32 max_outstanding_req_per_channel; - - /* - * Divide the ring buffer data size (which is 1 page less - * than the ring buffer size since that page is reserved for - * the ring buffer indices) by the max request size (which is - * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) - */ - max_outstanding_req_per_channel = - ((storvsc_ringbuffer_size - PAGE_SIZE) / - ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + - sizeof(struct vstor_packet) + sizeof(u64), - sizeof(u64))); - - if (max_outstanding_req_per_channel < - STORVSC_MAX_IO_REQUESTS) - return -EINVAL; - - return vmbus_driver_register(&storvsc_drv); -} - -static void __exit storvsc_drv_exit(void) -{ - vmbus_driver_unregister(&storvsc_drv); -} - -MODULE_LICENSE("GPL"); -MODULE_VERSION(HV_DRV_VERSION); -MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); -module_init(storvsc_drv_init); -module_exit(storvsc_drv_exit); |