| /* |
| * 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/init.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/blkdev.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> |
| |
| #include "hyperv.h" |
| #include "hyperv_storage.h" |
| |
| 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)"); |
| |
| struct hv_host_device { |
| struct hv_device *dev; |
| struct kmem_cache *request_pool; |
| 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; |
| }; |
| |
| |
| static int storvsc_device_alloc(struct scsi_device *sdevice) |
| { |
| /* |
| * This enables luns to be located sparsely. Otherwise, we may not |
| * discovered them. |
| */ |
| sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; |
| return 0; |
| } |
| |
| static int storvsc_merge_bvec(struct request_queue *q, |
| struct bvec_merge_data *bmd, struct bio_vec *bvec) |
| { |
| /* checking done by caller. */ |
| return bvec->bv_len; |
| } |
| |
| 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_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
| |
| 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 i; |
| int num_pages; |
| struct scatterlist *bounce_sgl; |
| struct page *page_buf; |
| |
| 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, 0, 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) |
| { |
| 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++; |
| |
| /* 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 Scsi_Host *host = dev_get_drvdata(&dev->device); |
| struct hv_host_device *host_dev = |
| (struct hv_host_device *)host->hostdata; |
| |
| scsi_remove_host(host); |
| |
| scsi_host_put(host); |
| |
| storvsc_dev_remove(dev); |
| if (host_dev->request_pool) { |
| kmem_cache_destroy(host_dev->request_pool); |
| host_dev->request_pool = NULL; |
| } |
| 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_stor_device(device); |
| if (!stor_device) |
| return -ENODEV; |
| |
| 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) |
| goto cleanup; |
| |
| t = wait_for_completion_timeout(&request->wait_event, 5*HZ); |
| if (t == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| |
| /* |
| * 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; |
| } |
| |
| |
| /* |
| * storvsc_host_reset_handler - Reset the scsi HBA |
| */ |
| static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
| { |
| int ret; |
| struct hv_host_device *host_dev = |
| (struct hv_host_device *)scmnd->device->host->hostdata; |
| struct hv_device *dev = host_dev->dev; |
| |
| ret = storvsc_host_reset(dev); |
| if (ret != 0) |
| return ret; |
| |
| return ret; |
| } |
| |
| |
| /* |
| * storvsc_commmand_completion - Command completion processing |
| */ |
| static void storvsc_commmand_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 = |
| (struct hv_host_device *)scmnd->device->host->hostdata; |
| void (*scsi_done_fn)(struct scsi_cmnd *); |
| struct scsi_sense_hdr sense_hdr; |
| struct vmscsi_request *vm_srb; |
| |
| if (cmd_request->bounce_sgl_count) { |
| |
| /* FIXME: We can optimize on writes by just skipping this */ |
| copy_from_bounce_buffer(scsi_sglist(scmnd), |
| cmd_request->bounce_sgl, |
| scsi_sg_count(scmnd)); |
| destroy_bounce_buffer(cmd_request->bounce_sgl, |
| cmd_request->bounce_sgl_count); |
| } |
| |
| vm_srb = &request->vstor_packet.vm_srb; |
| scmnd->result = vm_srb->scsi_status; |
| |
| if (scmnd->result) { |
| if (scsi_normalize_sense(scmnd->sense_buffer, |
| SCSI_SENSE_BUFFERSIZE, &sense_hdr)) |
| scsi_print_sense_hdr("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); |
| |
| kmem_cache_free(host_dev->request_pool, cmd_request); |
| } |
| |
| |
| /* |
| * storvsc_queuecommand - Initiate command processing |
| */ |
| static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, |
| void (*done)(struct scsi_cmnd *)) |
| { |
| int ret; |
| struct hv_host_device *host_dev = |
| (struct hv_host_device *)scmnd->device->host->hostdata; |
| 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; |
| |
| |
| /* If retrying, no need to prep the cmd */ |
| if (scmnd->host_scribble) { |
| |
| cmd_request = |
| (struct storvsc_cmd_request *)scmnd->host_scribble; |
| |
| goto retry_request; |
| } |
| |
| scmnd->scsi_done = done; |
| |
| request_size = sizeof(struct storvsc_cmd_request); |
| |
| cmd_request = kmem_cache_zalloc(host_dev->request_pool, |
| GFP_ATOMIC); |
| if (!cmd_request) { |
| scmnd->scsi_done = NULL; |
| return SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| |
| /* 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_commmand_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)); |
| if (!cmd_request->bounce_sgl) { |
| scmnd->scsi_done = NULL; |
| scmnd->host_scribble = NULL; |
| kmem_cache_free(host_dev->request_pool, |
| cmd_request); |
| |
| return SCSI_MLQUEUE_HOST_BUSY; |
| } |
| |
| cmd_request->bounce_sgl_count = |
| ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> |
| PAGE_SHIFT; |
| |
| /* |
| * FIXME: We can optimize on reads by just skipping |
| * this |
| */ |
| 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) { |
| /* |
| * FIXME: We can optimize on writes by just skipping |
| * this |
| */ |
| copy_from_bounce_buffer(scsi_sglist(scmnd), |
| cmd_request->bounce_sgl, |
| scsi_sg_count(scmnd)); |
| destroy_bounce_buffer(cmd_request->bounce_sgl, |
| cmd_request->bounce_sgl_count); |
| } |
| |
| kmem_cache_free(host_dev->request_pool, cmd_request); |
| |
| scmnd->scsi_done = NULL; |
| scmnd->host_scribble = NULL; |
| |
| ret = SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| |
| return ret; |
| } |
| |
| static DEF_SCSI_QCMD(storvsc_queuecommand) |
| |
| |
| /* 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_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, |
| /* |
| * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge |
| * into 1 sg element. If set, we must limit the max_segment_size to |
| * PAGE_SIZE, otherwise we may get 1 sg element that represents |
| * multiple |
| */ |
| /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */ |
| .use_clustering = ENABLE_CLUSTERING, |
| /* Make sure we dont get a sg segment crosses a page boundary */ |
| .dma_boundary = PAGE_SIZE-1, |
| }; |
| |
| 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) }, |
| { }, |
| }; |
| |
| MODULE_DEVICE_TABLE(vmbus, id_table); |
| /* |
| * storvsc_probe - Add a new device for this driver |
| */ |
| |
| static int storvsc_probe(struct hv_device *device) |
| { |
| int ret; |
| struct Scsi_Host *host; |
| struct hv_host_device *host_dev; |
| struct storvsc_device_info device_info; |
| |
| host = scsi_host_alloc(&scsi_driver, |
| sizeof(struct hv_host_device)); |
| if (!host) |
| return -ENOMEM; |
| |
| dev_set_drvdata(&device->device, host); |
| |
| host_dev = (struct hv_host_device *)host->hostdata; |
| memset(host_dev, 0, sizeof(struct hv_host_device)); |
| |
| host_dev->port = host->host_no; |
| host_dev->dev = device; |
| |
| host_dev->request_pool = |
| kmem_cache_create(dev_name(&device->device), |
| sizeof(struct storvsc_cmd_request), 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| |
| if (!host_dev->request_pool) { |
| scsi_host_put(host); |
| return -ENOMEM; |
| } |
| |
| device_info.port_number = host->host_no; |
| device_info.ring_buffer_size = storvsc_ringbuffer_size; |
| /* Call to the vsc driver to add the device */ |
| ret = storvsc_dev_add(device, (void *)&device_info); |
| |
| if (ret != 0) { |
| kmem_cache_destroy(host_dev->request_pool); |
| scsi_host_put(host); |
| return -1; |
| } |
| |
| host_dev->path = device_info.path_id; |
| host_dev->target = device_info.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; |
| |
| /* Register the HBA and start the scsi bus scan */ |
| ret = scsi_add_host(host, &device->device); |
| if (ret != 0) { |
| |
| storvsc_dev_remove(device); |
| |
| kmem_cache_destroy(host_dev->request_pool); |
| scsi_host_put(host); |
| return -1; |
| } |
| |
| scsi_scan_host(host); |
| return ret; |
| } |
| |
| /* The one and only one */ |
| |
| static struct hv_driver storvsc_drv = { |
| .name = "storvsc", |
| .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 -1; |
| |
| 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); |