| /* |
| * |
| * 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/init.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 "osd.h" |
| #include "logging.h" |
| #include "vmbus.h" |
| #include "include/StorVscApi.h" |
| |
| |
| /* #defines */ |
| |
| |
| |
| /* Data types */ |
| |
| struct host_device_context { |
| struct work_struct host_rescan_work; /* must be 1st field */ |
| struct device_context *device_ctx; /* point back to our device context */ |
| 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; |
| /* !!!DO NOT ADD ANYTHING BELOW HERE!!! */ |
| /* The extension buffer falls right here and is pointed to by request.Extension; */ |
| }; |
| |
| struct storvsc_driver_context { |
| /* !! These must be the first 2 fields !! */ |
| struct driver_context drv_ctx; |
| struct storvsc_driver_object drv_obj; |
| }; |
| |
| /* Static decl */ |
| static int storvsc_probe(struct device *dev); |
| static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)); |
| static int storvsc_device_alloc(struct scsi_device *); |
| static int storvsc_device_configure(struct scsi_device *); |
| static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); |
| static void storvsc_host_rescan_callback(struct work_struct *work); |
| static void storvsc_host_rescan(struct hv_device* device_obj); |
| static int storvsc_remove(struct device *dev); |
| |
| static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len); |
| static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
| static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); |
| static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); |
| static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); |
| |
| static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count); |
| static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info); |
| |
| |
| static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; |
| |
| /* The one and only one */ |
| static struct storvsc_driver_context g_storvsc_drv; |
| |
| /* 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, |
| .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, /* 64 max_queue * 1 target */ |
| .this_id = -1, |
| /* no use setting to 0 since ll_blk_rw reset it to 1 */ |
| .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,/* currently 32 */ |
| /* 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, |
| }; |
| |
| |
| /*++ |
| |
| Name: storvsc_drv_init() |
| |
| Desc: StorVsc driver initialization. |
| |
| --*/ |
| static int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) |
| { |
| int ret=0; |
| struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
| struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); |
| |
| storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; |
| storvsc_drv_obj->OnHostRescan = storvsc_host_rescan; |
| |
| /* Callback to client driver to complete the initialization */ |
| pfn_drv_init(&storvsc_drv_obj->Base); |
| |
| DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); |
| |
| if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS) |
| { |
| DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.", |
| STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); |
| return -1; |
| } |
| |
| drv_ctx->driver.name = storvsc_drv_obj->Base.name; |
| memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(struct hv_guid)); |
| |
| drv_ctx->probe = storvsc_probe; |
| drv_ctx->remove = storvsc_remove; |
| |
| /* The driver belongs to vmbus */ |
| ret = vmbus_child_driver_register(drv_ctx); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return ret; |
| } |
| |
| |
| static int storvsc_drv_exit_cb(struct device *dev, void *data) |
| { |
| struct device **curr = (struct device **)data; |
| *curr = dev; |
| return 1; /* stop iterating */ |
| } |
| |
| /*++ |
| |
| Name: storvsc_drv_exit() |
| |
| Desc: |
| |
| --*/ |
| static void storvsc_drv_exit(void) |
| { |
| struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj; |
| struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; |
| struct device *current_dev=NULL; |
| int ret; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| while (1) |
| { |
| current_dev = NULL; |
| |
| /* Get the device */ |
| ret = driver_for_each_device(&drv_ctx->driver, NULL, |
| (void *) ¤t_dev, |
| storvsc_drv_exit_cb); |
| |
| if (ret) |
| DPRINT_WARN(STORVSC_DRV, |
| "driver_for_each_device returned %d", ret); |
| |
| if (current_dev == NULL) |
| break; |
| |
| /* Initiate removal from the top-down */ |
| device_unregister(current_dev); |
| } |
| |
| if (storvsc_drv_obj->Base.OnCleanup) |
| storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); |
| |
| vmbus_child_driver_unregister(drv_ctx); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return; |
| } |
| |
| /*++ |
| |
| Name: storvsc_probe() |
| |
| Desc: Add a new device for this driver |
| |
| --*/ |
| static int storvsc_probe(struct device *device) |
| { |
| int ret=0; |
| |
| struct driver_context *driver_ctx = driver_to_driver_context(device->driver); |
| struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| |
| struct device_context *device_ctx = device_to_device_context(device); |
| struct hv_device *device_obj = &device_ctx->device_obj; |
| |
| struct Scsi_Host *host; |
| struct host_device_context *host_device_ctx; |
| struct storvsc_device_info device_info; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| if (!storvsc_drv_obj->Base.OnDeviceAdd) |
| return -1; |
| |
| host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context)); |
| if (!host) |
| { |
| DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); |
| return -ENOMEM; |
| } |
| |
| dev_set_drvdata(device, host); |
| |
| host_device_ctx = (struct host_device_context*)host->hostdata; |
| memset(host_device_ctx, 0, sizeof(struct host_device_context)); |
| |
| host_device_ctx->port = host->host_no; |
| host_device_ctx->device_ctx = device_ctx; |
| |
| INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback); |
| |
| host_device_ctx->request_pool = |
| kmem_cache_create |
| (dev_name(&device_ctx->device), |
| sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, |
| 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| |
| if (!host_device_ctx->request_pool) |
| { |
| scsi_host_put(host); |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return -ENOMEM; |
| } |
| |
| device_info.PortNumber = host->host_no; |
| /* Call to the vsc driver to add the device */ |
| ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info); |
| if (ret != 0) |
| { |
| DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); |
| kmem_cache_destroy(host_device_ctx->request_pool); |
| scsi_host_put(host); |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return -1; |
| } |
| |
| /* host_device_ctx->port = device_info.PortNumber; */ |
| host_device_ctx->path = device_info.PathId; |
| host_device_ctx->target = device_info.TargetId; |
| |
| host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; /* max # of devices per target */ |
| host->max_id = STORVSC_MAX_TARGETS; /* max # of targets per channel */ |
| host->max_channel = STORVSC_MAX_CHANNELS -1; /* max # of channels */ |
| |
| /* Register the HBA and start the scsi bus scan */ |
| ret = scsi_add_host(host, device); |
| if (ret != 0) |
| { |
| DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); |
| |
| storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
| |
| kmem_cache_destroy(host_device_ctx->request_pool); |
| scsi_host_put(host); |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return -1; |
| } |
| |
| scsi_scan_host(host); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return ret; |
| } |
| |
| |
| /*++ |
| |
| Name: storvsc_remove() |
| |
| Desc: Callback when our device is removed |
| |
| --*/ |
| static int storvsc_remove(struct device *device) |
| { |
| int ret=0; |
| |
| struct driver_context *driver_ctx = driver_to_driver_context(device->driver); |
| struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| |
| struct device_context *device_ctx = device_to_device_context(device); |
| struct hv_device *device_obj = &device_ctx->device_obj; |
| |
| struct Scsi_Host *host = dev_get_drvdata(device); |
| struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata; |
| |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| if (!storvsc_drv_obj->Base.OnDeviceRemove) |
| { |
| DPRINT_EXIT(STORVSC_DRV); |
| return -1; |
| } |
| |
| /* Call to the vsc driver to let it know that the device is being removed */ |
| ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); |
| if (ret != 0) |
| { |
| /* TODO: */ |
| DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret); |
| } |
| |
| if (host_device_ctx->request_pool) |
| { |
| kmem_cache_destroy(host_device_ctx->request_pool); |
| host_device_ctx->request_pool = NULL; |
| } |
| |
| DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); |
| scsi_remove_host(host); |
| |
| DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); |
| scsi_host_put(host); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return ret; |
| } |
| |
| /*++ |
| |
| Name: storvsc_commmand_completion() |
| |
| Desc: 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 host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; |
| void (*scsi_done_fn)(struct scsi_cmnd *); |
| struct scsi_sense_hdr sense_hdr; |
| |
| ASSERT(request == &cmd_request->request); |
| ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request); |
| ASSERT(scmnd); |
| ASSERT(scmnd->scsi_done); |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| if (cmd_request->bounce_sgl_count)/* using bounce buffer */ |
| { |
| /* printk("copy_from_bounce_buffer\n"); */ |
| |
| /* 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); |
| } |
| |
| scmnd->result = request->Status; |
| |
| if (scmnd->result) |
| { |
| if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr)) |
| { |
| scsi_print_sense_hdr("storvsc", &sense_hdr); |
| } |
| } |
| |
| ASSERT(request->BytesXfer <= request->DataBuffer.Length); |
| scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); |
| |
| scsi_done_fn = scmnd->scsi_done; |
| |
| scmnd->host_scribble = NULL; |
| scmnd->scsi_done = NULL; |
| |
| /* !!DO NOT MODIFY the scmnd after this call */ |
| scsi_done_fn(scmnd); |
| |
| kmem_cache_free(host_device_ctx->request_pool, cmd_request); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| } |
| |
| static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) |
| { |
| int i=0; |
| |
| /* 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=0; |
| struct scatterlist* bounce_sgl; |
| struct page *page_buf; |
| |
| num_pages = ALIGN_UP(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; |
| } |
| |
| 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++) |
| { |
| if ((page_buf = sg_page((&sgl[i]))) != NULL) |
| |
| { |
| __free_page(page_buf); |
| } |
| } |
| |
| kfree(sgl); |
| } |
| |
| /* 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=0,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 (PageHighMem(orig_sgl[i].page)) */ |
| /* printk("HighMem page detected - addr %p", (void*)src); */ |
| |
| ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); |
| |
| if (j == 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; |
| } |
| |
| /* 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=0,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; |
| ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); |
| |
| if (j == 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; |
| } |
| |
| |
| /*++ |
| |
| Name: storvsc_queuecommand() |
| |
| Desc: Initiate command processing |
| |
| --*/ |
| static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)) |
| { |
| int ret=0; |
| struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; |
| struct device_context *device_ctx=host_device_ctx->device_ctx; |
| struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); |
| struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| |
| struct hv_storvsc_request *request; |
| struct storvsc_cmd_request *cmd_request; |
| unsigned int request_size=0; |
| int i; |
| struct scatterlist *sgl; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", |
| scmnd, |
| scmnd->sc_data_direction, |
| scsi_sg_count(scmnd), |
| scsi_sglist(scmnd), |
| scsi_bufflen(scmnd), |
| scmnd->device->queue_depth, |
| scmnd->device->tagged_supported); |
| |
| /* If retrying, no need to prep the cmd */ |
| if (scmnd->host_scribble) |
| { |
| ASSERT(scmnd->scsi_done != NULL); |
| |
| cmd_request = (struct storvsc_cmd_request* )scmnd->host_scribble; |
| DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", scmnd, cmd_request); |
| |
| goto retry_request; |
| } |
| |
| ASSERT(scmnd->scsi_done == NULL); |
| ASSERT(scmnd->host_scribble == NULL); |
| |
| scmnd->scsi_done = done; |
| |
| request_size = sizeof(struct storvsc_cmd_request); |
| |
| cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC); |
| if (!cmd_request) |
| { |
| DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd); |
| |
| 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; |
| |
| request->Extension = (void*)((unsigned long)cmd_request + request_size); |
| DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize); |
| |
| /* Build the SRB */ |
| switch(scmnd->sc_data_direction) |
| { |
| case DMA_TO_DEVICE: |
| request->Type = WRITE_TYPE; |
| break; |
| case DMA_FROM_DEVICE: |
| request->Type = READ_TYPE; |
| break; |
| default: |
| request->Type = UNKNOWN_TYPE; |
| break; |
| } |
| |
| request->OnIOCompletion = storvsc_commmand_completion; |
| request->Context = cmd_request;/* scmnd; */ |
| |
| /* request->PortId = scmnd->device->channel; */ |
| request->Host = host_device_ctx->port; |
| request->Bus = scmnd->device->channel; |
| request->TargetId = scmnd->device->id; |
| request->LunId = scmnd->device->lun; |
| |
| ASSERT(scmnd->cmd_len <= 16); |
| request->CdbLen = scmnd->cmd_len; |
| request->Cdb = scmnd->cmnd; |
| |
| request->SenseBuffer = scmnd->sense_buffer; |
| request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; |
| |
| |
| request->DataBuffer.Length = scsi_bufflen(scmnd); |
| if (scsi_sg_count(scmnd)) |
| { |
| sgl = (struct scatterlist*)scsi_sglist(scmnd); |
| |
| /* check if we need to bounce the sgl */ |
| if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) |
| { |
| DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd); |
| cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd)); |
| if (!cmd_request->bounce_sgl) |
| { |
| DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd); |
| |
| scmnd->scsi_done = NULL; |
| scmnd->host_scribble = NULL; |
| kmem_cache_free(host_device_ctx->request_pool, cmd_request); |
| |
| return SCSI_MLQUEUE_HOST_BUSY; |
| } |
| |
| cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT; |
| |
| /* printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl); */ |
| /* printk("copy_to_bounce_buffer\n"); */ |
| /* 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; |
| } |
| |
| request->DataBuffer.Offset = sgl[0].offset; |
| |
| for (i = 0; i < scsi_sg_count(scmnd); i++ ) |
| { |
| DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset); |
| request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i]))); |
| } |
| } |
| |
| else if (scsi_sglist(scmnd)) |
| { |
| ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); |
| request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); |
| request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; |
| } |
| else |
| { |
| ASSERT(scsi_bufflen(scmnd) == 0); |
| } |
| |
| retry_request: |
| |
| /* Invokes the vsc to start an IO */ |
| ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request); |
| if (ret == -1) /* no more space */ |
| { |
| DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd); |
| |
| 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_device_ctx->request_pool, cmd_request); |
| |
| scmnd->scsi_done = NULL; |
| scmnd->host_scribble = NULL; |
| |
| ret = SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return ret; |
| } |
| |
| static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec) |
| { |
| return bvec->bv_len; /* checking done by caller. */ |
| } |
| |
| /*++ |
| |
| Name: storvsc_device_configure() |
| |
| Desc: Configure the specified scsi device |
| |
| --*/ |
| static int storvsc_device_alloc(struct scsi_device *sdevice) |
| { |
| DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN); |
| /* 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_device_configure(struct scsi_device *sdevice) |
| { |
| DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth); |
| |
| DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS); |
| scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS); |
| |
| DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld", sdevice, PAGE_SIZE); |
| blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); |
| |
| DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", sdevice); |
| blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); |
| |
| blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); |
| /* sdevice->timeout = (2000 * HZ);//(75 * HZ); */ |
| |
| return 0; |
| } |
| |
| /*++ |
| |
| Name: storvsc_host_reset_handler() |
| |
| Desc: Reset the scsi HBA |
| |
| --*/ |
| static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) |
| { |
| int ret=SUCCESS; |
| struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; |
| struct device_context *device_ctx = host_device_ctx->device_ctx; |
| struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); |
| struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; |
| |
| struct storvsc_driver_object *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj); |
| |
| /* Invokes the vsc to reset the host/bus */ |
| ASSERT(storvsc_drv_obj->OnHostReset); |
| ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj); |
| if (ret != 0) |
| { |
| DPRINT_EXIT(STORVSC_DRV); |
| return ret; |
| } |
| |
| DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return ret; |
| } |
| |
| /*++ |
| |
| Name: storvsc_host_rescan |
| |
| Desc: Rescan the scsi HBA |
| |
| --*/ |
| static void storvsc_host_rescan_callback(struct work_struct *work) |
| { |
| struct hv_device *device_obj = |
| &((struct host_device_context*)work)->device_ctx->device_obj; |
| struct device_context* device_ctx = to_device_context(device_obj); |
| struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device); |
| struct scsi_device *sdev; |
| struct host_device_context *host_device_ctx; |
| struct scsi_device **sdevs_remove_list; |
| unsigned int sdevs_count=0; |
| unsigned int found; |
| unsigned int i; |
| unsigned int lun_count=0; |
| unsigned int *lun_list; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| host_device_ctx = (struct host_device_context*)host->hostdata; |
| lun_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(unsigned int), GFP_ATOMIC); |
| if (!lun_list) |
| { |
| DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list"); |
| return; |
| } |
| |
| sdevs_remove_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(void *), GFP_ATOMIC); |
| if (!sdevs_remove_list) |
| { |
| kfree(lun_list); |
| DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list"); |
| return; |
| } |
| |
| DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices..."); |
| |
| /* Rescan for new device */ |
| scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1); |
| |
| DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device..."); |
| |
| /* Use the 1st device to send the report luns cmd */ |
| shost_for_each_device(sdev, host) |
| { |
| lun_count=STORVSC_MAX_LUNS_PER_TARGET; |
| storvsc_report_luns(sdev, lun_list, &lun_count); |
| |
| DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count); |
| DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no); |
| |
| scsi_device_put(sdev); |
| break; |
| } |
| |
| for (i=0; i<lun_count; i++) |
| { |
| DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]); |
| } |
| |
| /* Rescan for devices that may have been removed. */ |
| /* We do not have to worry that new devices may have been added since */ |
| /* this callback is serialized by the workqueue ie add/remove are done here. */ |
| shost_for_each_device(sdev, host) |
| { |
| /* See if this device is still here */ |
| found = 0; |
| for (i=0; i<lun_count; i++) |
| { |
| if (sdev->lun == lun_list[i]) |
| { |
| found = 1; |
| break; |
| } |
| } |
| if (!found) |
| { |
| DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun); |
| sdevs_remove_list[sdevs_count++] = sdev; |
| } |
| } |
| |
| /* Now remove the devices */ |
| for (i=0; i< sdevs_count; i++) |
| { |
| DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...", |
| sdevs_remove_list[i], sdevs_remove_list[i]->lun); |
| |
| /* make sure it is not removed from underneath us */ |
| if (!scsi_device_get(sdevs_remove_list[i])) |
| { |
| scsi_remove_device(sdevs_remove_list[i]); |
| scsi_device_put(sdevs_remove_list[i]); |
| } |
| } |
| |
| DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path); |
| |
| kfree(lun_list); |
| kfree(sdevs_remove_list); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| } |
| |
| static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count) |
| { |
| int i,j; |
| unsigned int lun=0; |
| unsigned int num_luns; |
| int result; |
| unsigned char *data; |
| struct scsi_sense_hdr sshdr; |
| unsigned char cmd[16]={0}; |
| unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); /* Add 1 to cover the report_lun header */ |
| unsigned long long *report_luns; |
| const unsigned int in_lun_count = *lun_count; |
| |
| *lun_count = 0; |
| |
| report_luns = kzalloc(report_len, GFP_ATOMIC); |
| if (!report_luns) |
| { |
| return -ENOMEM; |
| } |
| |
| cmd[0] = REPORT_LUNS; |
| |
| /* cmd length */ |
| *(unsigned int*)&cmd[6] = cpu_to_be32(report_len); |
| |
| result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3, NULL); |
| if (result != 0) |
| { |
| kfree(report_luns); |
| return -EBUSY; |
| } |
| |
| /* get the length from the first four bytes */ |
| report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]); |
| |
| num_luns = (report_len / sizeof(unsigned long long)); |
| if (num_luns > in_lun_count) |
| { |
| kfree(report_luns); |
| return -EINVAL; |
| } |
| |
| *lun_count = num_luns; |
| |
| DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns); |
| |
| /* lun id starts at 1 */ |
| for (i=1; i< num_luns+1; i++) |
| { |
| lun = 0; |
| data = (unsigned char*)&report_luns[i]; |
| for (j = 0; j < sizeof(lun); j += 2) |
| { |
| lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8)); |
| } |
| |
| luns[i-1] = lun; |
| } |
| |
| kfree(report_luns); |
| return 0; |
| } |
| |
| static void storvsc_host_rescan(struct hv_device *device_obj) |
| { |
| struct device_context* device_ctx = to_device_context(device_obj); |
| struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device); |
| struct host_device_context *host_device_ctx; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| host_device_ctx = (struct host_device_context*)host->hostdata; |
| |
| DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path); |
| |
| /* We need to queue this since the scanning may block and the caller may be in an intr context */ |
| /* scsi_queue_work(host, &host_device_ctx->host_rescan_work); */ |
| schedule_work(&host_device_ctx->host_rescan_work); |
| DPRINT_EXIT(STORVSC_DRV); |
| } |
| |
| static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info) |
| { |
| sector_t total_sectors = capacity; |
| sector_t cylinder_times_heads=0; |
| sector_t temp=0; |
| |
| int sectors_per_track=0; |
| int heads=0; |
| int cylinders=0; |
| int rem=0; |
| |
| if (total_sectors > (65535 * 16 * 255)) { |
| total_sectors = (65535 * 16 * 255); |
| } |
| |
| if (total_sectors >= (65535 * 16 * 63)) { |
| sectors_per_track = 255; |
| heads = 16; |
| |
| cylinder_times_heads = total_sectors; |
| rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
| } |
| else |
| { |
| sectors_per_track = 17; |
| |
| cylinder_times_heads = total_sectors; |
| rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
| |
| temp = cylinder_times_heads + 1023; |
| rem = sector_div(temp, 1024); /* sector_div stores the quotient in temp */ |
| |
| heads = temp; |
| |
| if (heads < 4) { |
| heads = 4; |
| } |
| |
| if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { |
| sectors_per_track = 31; |
| heads = 16; |
| |
| cylinder_times_heads = total_sectors; |
| rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
| } |
| |
| if (cylinder_times_heads >= (heads * 1024)) { |
| sectors_per_track = 63; |
| heads = 16; |
| |
| cylinder_times_heads = total_sectors; |
| rem = sector_div(cylinder_times_heads, sectors_per_track); /* sector_div stores the quotient in cylinder_times_heads */ |
| } |
| } |
| |
| temp = cylinder_times_heads; |
| rem = sector_div(temp, heads); /* sector_div stores the quotient in temp */ |
| cylinders = temp; |
| |
| info[0] = heads; |
| info[1] = sectors_per_track; |
| info[2] = cylinders; |
| |
| DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track); |
| |
| return 0; |
| } |
| |
| MODULE_LICENSE("GPL"); |
| |
| static int __init storvsc_init(void) |
| { |
| int ret; |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); |
| |
| ret = storvsc_drv_init(StorVscInitialize); |
| |
| DPRINT_EXIT(STORVSC_DRV); |
| |
| return ret; |
| } |
| |
| static void __exit storvsc_exit(void) |
| { |
| DPRINT_ENTER(STORVSC_DRV); |
| |
| storvsc_drv_exit(); |
| |
| DPRINT_ENTER(STORVSC_DRV); |
| } |
| |
| module_param(storvsc_ringbuffer_size, int, S_IRUGO); |
| |
| module_init(storvsc_init); |
| module_exit(storvsc_exit); |
| |
| /* eof */ |