![Stephen Hemminger](/assets/img/avatar_default.png)
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Cc: Hank Janssen <hjanssen@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
999 lines
27 KiB
C
999 lines
27 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/blkdev.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_devinfo.h>
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#include <scsi/scsi_dbg.h>
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#include "osd.h"
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#include "logging.h"
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#include "version_info.h"
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#include "vmbus.h"
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#include "storvsc_api.h"
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struct host_device_context {
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/* must be 1st field
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* FIXME this is a bug */
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/* point back to our device context */
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struct vm_device *device_ctx;
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struct kmem_cache *request_pool;
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unsigned int port;
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unsigned char path;
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unsigned char target;
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};
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struct storvsc_cmd_request {
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struct list_head entry;
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struct scsi_cmnd *cmd;
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unsigned int bounce_sgl_count;
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struct scatterlist *bounce_sgl;
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struct hv_storvsc_request request;
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/* !!!DO NOT ADD ANYTHING BELOW HERE!!! */
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/* The extension buffer falls right here and is pointed to by
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* request.Extension;
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* Which sounds like a very bad design... */
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};
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struct storvsc_driver_context {
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/* !! These must be the first 2 fields !! */
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/* FIXME this is a bug... */
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struct driver_context drv_ctx;
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struct storvsc_driver_object drv_obj;
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};
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/* Static decl */
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static int storvsc_probe(struct device *dev);
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static int storvsc_queuecommand(struct scsi_cmnd *scmnd,
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void (*done)(struct scsi_cmnd *));
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static int storvsc_device_alloc(struct scsi_device *);
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static int storvsc_device_configure(struct scsi_device *);
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static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd);
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static int storvsc_remove(struct device *dev);
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static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
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unsigned int sg_count,
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unsigned int len);
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static void destroy_bounce_buffer(struct scatterlist *sgl,
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unsigned int sg_count);
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static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count);
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static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
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struct scatterlist *bounce_sgl,
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unsigned int orig_sgl_count);
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static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
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struct scatterlist *bounce_sgl,
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unsigned int orig_sgl_count);
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static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev,
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sector_t capacity, int *info);
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static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
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module_param(storvsc_ringbuffer_size, int, S_IRUGO);
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MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
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/* The one and only one */
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static struct storvsc_driver_context g_storvsc_drv;
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/* Scsi driver */
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static struct scsi_host_template scsi_driver = {
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.module = THIS_MODULE,
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.name = "storvsc_host_t",
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.bios_param = storvsc_get_chs,
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.queuecommand = storvsc_queuecommand,
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.eh_host_reset_handler = storvsc_host_reset_handler,
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.slave_alloc = storvsc_device_alloc,
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.slave_configure = storvsc_device_configure,
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.cmd_per_lun = 1,
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/* 64 max_queue * 1 target */
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.can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
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.this_id = -1,
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/* no use setting to 0 since ll_blk_rw reset it to 1 */
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/* currently 32 */
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.sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
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/*
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* ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
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* into 1 sg element. If set, we must limit the max_segment_size to
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* PAGE_SIZE, otherwise we may get 1 sg element that represents
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* multiple
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*/
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/* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
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.use_clustering = ENABLE_CLUSTERING,
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/* Make sure we dont get a sg segment crosses a page boundary */
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.dma_boundary = PAGE_SIZE-1,
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};
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/*
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* storvsc_drv_init - StorVsc driver initialization.
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*/
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static int storvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
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{
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int ret;
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struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj;
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struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx;
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DPRINT_ENTER(STORVSC_DRV);
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vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
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storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size;
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/* Callback to client driver to complete the initialization */
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drv_init(&storvsc_drv_obj->Base);
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DPRINT_INFO(STORVSC_DRV,
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"request extension size %u, max outstanding reqs %u",
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storvsc_drv_obj->RequestExtSize,
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storvsc_drv_obj->MaxOutstandingRequestsPerChannel);
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if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel <
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STORVSC_MAX_IO_REQUESTS) {
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DPRINT_ERR(STORVSC_DRV,
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"The number of outstanding io requests (%d) "
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"is larger than that supported (%d) internally.",
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STORVSC_MAX_IO_REQUESTS,
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storvsc_drv_obj->MaxOutstandingRequestsPerChannel);
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return -1;
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}
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drv_ctx->driver.name = storvsc_drv_obj->Base.name;
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memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType,
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sizeof(struct hv_guid));
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drv_ctx->probe = storvsc_probe;
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drv_ctx->remove = storvsc_remove;
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/* The driver belongs to vmbus */
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ret = vmbus_child_driver_register(drv_ctx);
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DPRINT_EXIT(STORVSC_DRV);
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return ret;
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}
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static int storvsc_drv_exit_cb(struct device *dev, void *data)
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{
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struct device **curr = (struct device **)data;
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*curr = dev;
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return 1; /* stop iterating */
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}
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static void storvsc_drv_exit(void)
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{
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struct storvsc_driver_object *storvsc_drv_obj = &g_storvsc_drv.drv_obj;
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struct driver_context *drv_ctx = &g_storvsc_drv.drv_ctx;
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struct device *current_dev = NULL;
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int ret;
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DPRINT_ENTER(STORVSC_DRV);
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while (1) {
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current_dev = NULL;
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/* Get the device */
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ret = driver_for_each_device(&drv_ctx->driver, NULL,
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(void *) ¤t_dev,
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storvsc_drv_exit_cb);
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if (ret)
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DPRINT_WARN(STORVSC_DRV,
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"driver_for_each_device returned %d", ret);
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if (current_dev == NULL)
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break;
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/* Initiate removal from the top-down */
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device_unregister(current_dev);
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}
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if (storvsc_drv_obj->Base.OnCleanup)
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storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
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vmbus_child_driver_unregister(drv_ctx);
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DPRINT_EXIT(STORVSC_DRV);
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return;
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}
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/*
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* storvsc_probe - Add a new device for this driver
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*/
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static int storvsc_probe(struct device *device)
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{
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int ret;
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struct driver_context *driver_ctx =
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driver_to_driver_context(device->driver);
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struct storvsc_driver_context *storvsc_drv_ctx =
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(struct storvsc_driver_context *)driver_ctx;
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struct storvsc_driver_object *storvsc_drv_obj =
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&storvsc_drv_ctx->drv_obj;
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struct vm_device *device_ctx = device_to_vm_device(device);
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struct hv_device *device_obj = &device_ctx->device_obj;
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struct Scsi_Host *host;
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struct host_device_context *host_device_ctx;
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struct storvsc_device_info device_info;
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DPRINT_ENTER(STORVSC_DRV);
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if (!storvsc_drv_obj->Base.OnDeviceAdd)
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return -1;
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host = scsi_host_alloc(&scsi_driver,
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sizeof(struct host_device_context));
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if (!host) {
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DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object");
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return -ENOMEM;
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}
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dev_set_drvdata(device, host);
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host_device_ctx = (struct host_device_context *)host->hostdata;
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memset(host_device_ctx, 0, sizeof(struct host_device_context));
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host_device_ctx->port = host->host_no;
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host_device_ctx->device_ctx = device_ctx;
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host_device_ctx->request_pool =
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kmem_cache_create(dev_name(&device_ctx->device),
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sizeof(struct storvsc_cmd_request) +
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storvsc_drv_obj->RequestExtSize, 0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!host_device_ctx->request_pool) {
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scsi_host_put(host);
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DPRINT_EXIT(STORVSC_DRV);
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return -ENOMEM;
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}
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device_info.PortNumber = host->host_no;
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/* Call to the vsc driver to add the device */
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ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj,
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(void *)&device_info);
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if (ret != 0) {
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DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device");
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kmem_cache_destroy(host_device_ctx->request_pool);
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scsi_host_put(host);
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DPRINT_EXIT(STORVSC_DRV);
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return -1;
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}
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/* host_device_ctx->port = device_info.PortNumber; */
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host_device_ctx->path = device_info.PathId;
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host_device_ctx->target = device_info.TargetId;
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/* max # of devices per target */
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host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
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/* max # of targets per channel */
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host->max_id = STORVSC_MAX_TARGETS;
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/* max # of channels */
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host->max_channel = STORVSC_MAX_CHANNELS - 1;
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/* Register the HBA and start the scsi bus scan */
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ret = scsi_add_host(host, device);
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if (ret != 0) {
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DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device");
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storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
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kmem_cache_destroy(host_device_ctx->request_pool);
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scsi_host_put(host);
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DPRINT_EXIT(STORVSC_DRV);
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return -1;
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}
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scsi_scan_host(host);
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DPRINT_EXIT(STORVSC_DRV);
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return ret;
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}
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/*
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* storvsc_remove - Callback when our device is removed
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*/
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static int storvsc_remove(struct device *device)
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{
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int ret;
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struct driver_context *driver_ctx =
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driver_to_driver_context(device->driver);
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struct storvsc_driver_context *storvsc_drv_ctx =
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(struct storvsc_driver_context *)driver_ctx;
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struct storvsc_driver_object *storvsc_drv_obj =
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&storvsc_drv_ctx->drv_obj;
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struct vm_device *device_ctx = device_to_vm_device(device);
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struct hv_device *device_obj = &device_ctx->device_obj;
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struct Scsi_Host *host = dev_get_drvdata(device);
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struct host_device_context *host_device_ctx =
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(struct host_device_context *)host->hostdata;
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DPRINT_ENTER(STORVSC_DRV);
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if (!storvsc_drv_obj->Base.OnDeviceRemove) {
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DPRINT_EXIT(STORVSC_DRV);
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return -1;
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}
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/*
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* Call to the vsc driver to let it know that the device is being
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* removed
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*/
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ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
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if (ret != 0) {
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/* TODO: */
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DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)",
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ret);
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}
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if (host_device_ctx->request_pool) {
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kmem_cache_destroy(host_device_ctx->request_pool);
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host_device_ctx->request_pool = NULL;
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}
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DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host);
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scsi_remove_host(host);
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DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host);
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scsi_host_put(host);
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DPRINT_EXIT(STORVSC_DRV);
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return ret;
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}
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/*
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* storvsc_commmand_completion - Command completion processing
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*/
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static void storvsc_commmand_completion(struct hv_storvsc_request *request)
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{
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struct storvsc_cmd_request *cmd_request =
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(struct storvsc_cmd_request *)request->Context;
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struct scsi_cmnd *scmnd = cmd_request->cmd;
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struct host_device_context *host_device_ctx =
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(struct host_device_context *)scmnd->device->host->hostdata;
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void (*scsi_done_fn)(struct scsi_cmnd *);
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struct scsi_sense_hdr sense_hdr;
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/* ASSERT(request == &cmd_request->request); */
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/* ASSERT(scmnd); */
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/* ASSERT((unsigned long)scmnd->host_scribble == */
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/* (unsigned long)cmd_request); */
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/* ASSERT(scmnd->scsi_done); */
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DPRINT_ENTER(STORVSC_DRV);
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if (cmd_request->bounce_sgl_count) {
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/* using bounce buffer */
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/* printk("copy_from_bounce_buffer\n"); */
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/* FIXME: We can optimize on writes by just skipping this */
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copy_from_bounce_buffer(scsi_sglist(scmnd),
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cmd_request->bounce_sgl,
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scsi_sg_count(scmnd));
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destroy_bounce_buffer(cmd_request->bounce_sgl,
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cmd_request->bounce_sgl_count);
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}
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scmnd->result = request->Status;
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if (scmnd->result) {
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if (scsi_normalize_sense(scmnd->sense_buffer,
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request->SenseBufferSize, &sense_hdr))
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scsi_print_sense_hdr("storvsc", &sense_hdr);
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}
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/* ASSERT(request->BytesXfer <= request->DataBuffer.Length); */
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scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer);
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scsi_done_fn = scmnd->scsi_done;
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scmnd->host_scribble = NULL;
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scmnd->scsi_done = NULL;
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/* !!DO NOT MODIFY the scmnd after this call */
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scsi_done_fn(scmnd);
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kmem_cache_free(host_device_ctx->request_pool, cmd_request);
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DPRINT_EXIT(STORVSC_DRV);
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}
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static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
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{
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int i;
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/* No need to check */
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if (sg_count < 2)
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return -1;
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/* We have at least 2 sg entries */
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for (i = 0; i < sg_count; i++) {
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if (i == 0) {
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/* make sure 1st one does not have hole */
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if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
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return i;
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} else if (i == sg_count - 1) {
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/* make sure last one does not have hole */
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if (sgl[i].offset != 0)
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return i;
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} else {
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/* make sure no hole in the middle */
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if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
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return i;
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}
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}
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return -1;
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}
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static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
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unsigned int sg_count,
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unsigned int len)
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{
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int i;
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int num_pages;
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struct scatterlist *bounce_sgl;
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struct page *page_buf;
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num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT;
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bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
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if (!bounce_sgl)
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return NULL;
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for (i = 0; i < num_pages; i++) {
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page_buf = alloc_page(GFP_ATOMIC);
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if (!page_buf)
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goto cleanup;
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sg_set_page(&bounce_sgl[i], page_buf, 0, 0);
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}
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return bounce_sgl;
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cleanup:
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destroy_bounce_buffer(bounce_sgl, num_pages);
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return NULL;
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}
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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);
|
|
}
|
|
|
|
/* 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;
|
|
|
|
/* 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;
|
|
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;
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* storvsc_queuecommand - Initiate command processing
|
|
*/
|
|
static int storvsc_queuecommand(struct scsi_cmnd *scmnd,
|
|
void (*done)(struct scsi_cmnd *))
|
|
{
|
|
int ret;
|
|
struct host_device_context *host_device_ctx =
|
|
(struct host_device_context *)scmnd->device->host->hostdata;
|
|
struct vm_device *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;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
/* checking done by caller. */
|
|
return bvec->bv_len;
|
|
}
|
|
|
|
/*
|
|
* storvsc_device_configure - 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;
|
|
}
|
|
|
|
/*
|
|
* storvsc_host_reset_handler - Reset the scsi HBA
|
|
*/
|
|
static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
|
|
{
|
|
int ret;
|
|
struct host_device_context *host_device_ctx =
|
|
(struct host_device_context *)scmnd->device->host->hostdata;
|
|
struct vm_device *device_ctx = host_device_ctx->device_ctx;
|
|
|
|
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 */
|
|
ret = StorVscOnHostReset(&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;
|
|
}
|
|
|
|
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;
|
|
/* sector_div stores the quotient in cylinder_times_heads */
|
|
rem = sector_div(cylinder_times_heads, sectors_per_track);
|
|
} else {
|
|
sectors_per_track = 17;
|
|
|
|
cylinder_times_heads = total_sectors;
|
|
/* sector_div stores the quotient in cylinder_times_heads */
|
|
rem = sector_div(cylinder_times_heads, sectors_per_track);
|
|
|
|
temp = cylinder_times_heads + 1023;
|
|
/* sector_div stores the quotient in temp */
|
|
rem = sector_div(temp, 1024);
|
|
|
|
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;
|
|
/*
|
|
* sector_div stores the quotient in
|
|
* cylinder_times_heads
|
|
*/
|
|
rem = sector_div(cylinder_times_heads,
|
|
sectors_per_track);
|
|
}
|
|
|
|
if (cylinder_times_heads >= (heads * 1024)) {
|
|
sectors_per_track = 63;
|
|
heads = 16;
|
|
|
|
cylinder_times_heads = total_sectors;
|
|
/*
|
|
* sector_div stores the quotient in
|
|
* cylinder_times_heads
|
|
*/
|
|
rem = sector_div(cylinder_times_heads,
|
|
sectors_per_track);
|
|
}
|
|
}
|
|
|
|
temp = cylinder_times_heads;
|
|
/* sector_div stores the quotient in temp */
|
|
rem = sector_div(temp, heads);
|
|
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;
|
|
}
|
|
|
|
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_LICENSE("GPL");
|
|
MODULE_VERSION(HV_DRV_VERSION);
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
|
|
module_init(storvsc_init);
|
|
module_exit(storvsc_exit);
|