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01415ab3d2
Compute max_outstanding_req_per_channel where it is needed. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Abhishek Kane <v-abkane@microsoft.com> Signed-off-by: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
870 lines
21 KiB
C
870 lines
21 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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* K. Y. Srinivasan <kys@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 "hv_api.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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#include "vstorage.h"
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#include "channel.h"
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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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static const char *driver_name = "storvsc";
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/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
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static const struct hv_guid gStorVscDeviceType = {
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.data = {
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0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
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0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
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}
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};
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struct hv_host_device {
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struct hv_device *dev;
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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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};
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/*
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* storvsc_initialize - Main entry point
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*/
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static int storvsc_initialize(struct hv_driver *driver)
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{
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struct storvsc_driver *stor_driver;
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stor_driver = hvdr_to_stordr(driver);
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/* Make sure we are at least 2 pages since 1 page is used for control */
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driver->name = driver_name;
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memcpy(&driver->dev_type, &gStorVscDeviceType,
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sizeof(struct hv_guid));
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return 0;
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}
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static int storvsc_device_alloc(struct scsi_device *sdevice)
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{
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/*
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* This enables luns to be located sparsely. Otherwise, we may not
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* discovered them.
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*/
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sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
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return 0;
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}
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static int storvsc_merge_bvec(struct request_queue *q,
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struct bvec_merge_data *bmd, struct bio_vec *bvec)
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{
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/* checking done by caller. */
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return bvec->bv_len;
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}
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static int storvsc_device_configure(struct scsi_device *sdevice)
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{
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scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
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STORVSC_MAX_IO_REQUESTS);
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DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %ld",
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sdevice, PAGE_SIZE);
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blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
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DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine",
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sdevice);
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blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
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blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
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return 0;
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}
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static void destroy_bounce_buffer(struct scatterlist *sgl,
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unsigned int sg_count)
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{
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int i;
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struct page *page_buf;
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for (i = 0; i < sg_count; i++) {
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page_buf = sg_page((&sgl[i]));
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if (page_buf != NULL)
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__free_page(page_buf);
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}
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kfree(sgl);
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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(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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/* Assume the original sgl has enough room */
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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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{
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int i;
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int j = 0;
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unsigned long src, dest;
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unsigned int srclen, destlen, copylen;
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unsigned int total_copied = 0;
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unsigned long bounce_addr = 0;
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unsigned long dest_addr = 0;
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unsigned long flags;
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local_irq_save(flags);
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for (i = 0; i < orig_sgl_count; i++) {
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dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
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KM_IRQ0) + orig_sgl[i].offset;
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dest = dest_addr;
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destlen = orig_sgl[i].length;
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if (bounce_addr == 0)
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bounce_addr =
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(unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
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KM_IRQ0);
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while (destlen) {
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src = bounce_addr + bounce_sgl[j].offset;
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srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
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copylen = min(srclen, destlen);
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memcpy((void *)dest, (void *)src, copylen);
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total_copied += copylen;
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bounce_sgl[j].offset += copylen;
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destlen -= copylen;
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dest += copylen;
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if (bounce_sgl[j].offset == bounce_sgl[j].length) {
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/* full */
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kunmap_atomic((void *)bounce_addr, KM_IRQ0);
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j++;
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/* if we need to use another bounce buffer */
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if (destlen || i != orig_sgl_count - 1)
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bounce_addr =
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(unsigned long)kmap_atomic(
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sg_page((&bounce_sgl[j])), KM_IRQ0);
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} else if (destlen == 0 && i == orig_sgl_count - 1) {
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/* unmap the last bounce that is < PAGE_SIZE */
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kunmap_atomic((void *)bounce_addr, KM_IRQ0);
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}
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}
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kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
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KM_IRQ0);
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}
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local_irq_restore(flags);
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return total_copied;
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}
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/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
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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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{
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int i;
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int j = 0;
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unsigned long src, dest;
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unsigned int srclen, destlen, copylen;
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unsigned int total_copied = 0;
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unsigned long bounce_addr = 0;
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unsigned long src_addr = 0;
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unsigned long flags;
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local_irq_save(flags);
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for (i = 0; i < orig_sgl_count; i++) {
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src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
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KM_IRQ0) + orig_sgl[i].offset;
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src = src_addr;
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srclen = orig_sgl[i].length;
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if (bounce_addr == 0)
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bounce_addr =
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(unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
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KM_IRQ0);
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while (srclen) {
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/* assume bounce offset always == 0 */
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dest = bounce_addr + bounce_sgl[j].length;
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destlen = PAGE_SIZE - bounce_sgl[j].length;
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copylen = min(srclen, destlen);
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memcpy((void *)dest, (void *)src, copylen);
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total_copied += copylen;
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bounce_sgl[j].length += copylen;
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srclen -= copylen;
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src += copylen;
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if (bounce_sgl[j].length == PAGE_SIZE) {
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/* full..move to next entry */
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kunmap_atomic((void *)bounce_addr, KM_IRQ0);
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j++;
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/* if we need to use another bounce buffer */
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if (srclen || i != orig_sgl_count - 1)
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bounce_addr =
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(unsigned long)kmap_atomic(
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sg_page((&bounce_sgl[j])), KM_IRQ0);
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} else if (srclen == 0 && i == orig_sgl_count - 1) {
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/* unmap the last bounce that is < PAGE_SIZE */
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kunmap_atomic((void *)bounce_addr, KM_IRQ0);
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}
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}
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kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
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}
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local_irq_restore(flags);
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return total_copied;
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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 hv_device *dev)
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{
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struct Scsi_Host *host = dev_get_drvdata(&dev->device);
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struct hv_host_device *host_dev =
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(struct hv_host_device *)host->hostdata;
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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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storvsc_dev_remove(dev);
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if (host_dev->request_pool) {
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kmem_cache_destroy(host_dev->request_pool);
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host_dev->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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return 0;
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}
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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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{
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sector_t nsect = capacity;
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sector_t cylinders = nsect;
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int heads, sectors_pt;
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/*
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* We are making up these values; let us keep it simple.
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*/
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heads = 0xff;
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sectors_pt = 0x3f; /* Sectors per track */
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sector_div(cylinders, heads * sectors_pt);
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if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
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cylinders = 0xffff;
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info[0] = heads;
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info[1] = sectors_pt;
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info[2] = (int)cylinders;
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DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", (int)cylinders, heads,
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sectors_pt);
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return 0;
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}
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static int storvsc_host_reset(struct hv_device *device)
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{
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struct storvsc_device *stor_device;
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struct hv_storvsc_request *request;
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struct vstor_packet *vstor_packet;
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int ret, t;
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DPRINT_INFO(STORVSC, "resetting host adapter...");
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stor_device = get_stor_device(device);
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if (!stor_device)
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return -1;
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request = &stor_device->reset_request;
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vstor_packet = &request->vstor_packet;
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init_completion(&request->wait_event);
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vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
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vstor_packet->flags = REQUEST_COMPLETION_FLAG;
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vstor_packet->vm_srb.path_id = stor_device->path_id;
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ret = vmbus_sendpacket(device->channel, vstor_packet,
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sizeof(struct vstor_packet),
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(unsigned long)&stor_device->reset_request,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0)
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goto cleanup;
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t = wait_for_completion_timeout(&request->wait_event, HZ);
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if (t == 0) {
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ret = -ETIMEDOUT;
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goto cleanup;
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}
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DPRINT_INFO(STORVSC, "host adapter reset completed");
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/*
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* At this point, all outstanding requests in the adapter
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* should have been flushed out and return to us
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*/
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cleanup:
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put_stor_device(device);
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return ret;
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}
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/*
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* storvsc_host_reset_handler - Reset the scsi HBA
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*/
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static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
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{
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int ret;
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struct hv_host_device *host_dev =
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(struct hv_host_device *)scmnd->device->host->hostdata;
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struct hv_device *dev = host_dev->dev;
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DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...",
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scmnd->device, dev);
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/* Invokes the vsc to reset the host/bus */
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ret = storvsc_host_reset(dev);
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if (ret != 0)
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return ret;
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DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted",
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scmnd->device, dev);
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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 hv_host_device *host_dev =
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(struct hv_host_device *)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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struct vmscsi_request *vm_srb;
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if (cmd_request->bounce_sgl_count) {
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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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vm_srb = &request->vstor_packet.vm_srb;
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scmnd->result = vm_srb->scsi_status;
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if (scmnd->result) {
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if (scsi_normalize_sense(scmnd->sense_buffer,
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SCSI_SENSE_BUFFERSIZE, &sense_hdr))
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scsi_print_sense_hdr("storvsc", &sense_hdr);
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}
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scsi_set_resid(scmnd,
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request->data_buffer.len -
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vm_srb->data_transfer_length);
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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 */
|
|
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;
|
|
DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p",
|
|
scmnd, cmd_request);
|
|
|
|
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 == -1) {
|
|
/* 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,
|
|
};
|
|
|
|
|
|
/*
|
|
* 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;
|
|
/* 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 storvsc_driver storvsc_drv = {
|
|
.base.probe = storvsc_probe,
|
|
.base.remove = storvsc_remove,
|
|
};
|
|
|
|
|
|
/*
|
|
* storvsc_drv_init - StorVsc driver initialization.
|
|
*/
|
|
static int storvsc_drv_init(void)
|
|
{
|
|
int ret;
|
|
struct storvsc_driver *storvsc_drv_obj = &storvsc_drv;
|
|
struct hv_driver *drv = &storvsc_drv.base;
|
|
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)));
|
|
|
|
storvsc_drv_obj->ring_buffer_size = storvsc_ringbuffer_size;
|
|
|
|
/* Callback to client driver to complete the initialization */
|
|
storvsc_initialize(&storvsc_drv_obj->base);
|
|
|
|
if (max_outstanding_req_per_channel <
|
|
STORVSC_MAX_IO_REQUESTS)
|
|
return -1;
|
|
|
|
drv->driver.name = storvsc_drv_obj->base.name;
|
|
|
|
|
|
/* The driver belongs to vmbus */
|
|
ret = vmbus_child_driver_register(&drv->driver);
|
|
|
|
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 */
|
|
}
|
|
|
|
static void storvsc_drv_exit(void)
|
|
{
|
|
struct hv_driver *drv = &storvsc_drv.base;
|
|
struct device *current_dev = NULL;
|
|
int ret;
|
|
|
|
while (1) {
|
|
current_dev = NULL;
|
|
|
|
/* Get the device */
|
|
ret = driver_for_each_device(&drv->driver, NULL,
|
|
(void *) ¤t_dev,
|
|
storvsc_drv_exit_cb);
|
|
|
|
|
|
if (current_dev == NULL)
|
|
break;
|
|
|
|
/* Initiate removal from the top-down */
|
|
device_unregister(current_dev);
|
|
}
|
|
|
|
vmbus_child_driver_unregister(&drv->driver);
|
|
return;
|
|
}
|
|
|
|
static int __init storvsc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
DPRINT_INFO(STORVSC_DRV, "Storvsc initializing....");
|
|
ret = storvsc_drv_init();
|
|
return ret;
|
|
}
|
|
|
|
static void __exit storvsc_exit(void)
|
|
{
|
|
storvsc_drv_exit();
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(HV_DRV_VERSION);
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
|
|
module_init(storvsc_init);
|
|
module_exit(storvsc_exit);
|