+++ /dev/null
-/*
- * Copyright (c) 2009, Microsoft Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307 USA.
- *
- * Authors:
- * Haiyang Zhang <haiyangz@microsoft.com>
- * Hank Janssen <hjanssen@microsoft.com>
- * K. Y. Srinivasan <kys@microsoft.com>
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/blkdev.h>
-#include <linux/major.h>
-#include <linux/delay.h>
-#include <linux/hdreg.h>
-#include <linux/slab.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_dbg.h>
-
-#include "hyperv.h"
-#include "hyperv_storage.h"
-
-
-#define BLKVSC_MINORS 64
-
-enum blkvsc_device_type {
- UNKNOWN_DEV_TYPE,
- HARDDISK_TYPE,
- DVD_TYPE,
-};
-
-enum blkvsc_op_type {
- DO_INQUIRY,
- DO_CAPACITY,
- DO_FLUSH,
-};
-
-/*
- * This request ties the struct request and struct
- * blkvsc_request/hv_storvsc_request together A struct request may be
- * represented by 1 or more struct blkvsc_request
- */
-struct blkvsc_request_group {
- int outstanding;
- int status;
- struct list_head blkvsc_req_list; /* list of blkvsc_requests */
-};
-
-struct blkvsc_request {
- /* blkvsc_request_group.blkvsc_req_list */
- struct list_head req_entry;
-
- /* block_device_context.pending_list */
- struct list_head pend_entry;
-
- /* This may be null if we generate a request internally */
- struct request *req;
-
- struct block_device_context *dev;
-
- /* The group this request is part of. Maybe null */
- struct blkvsc_request_group *group;
-
- int write;
- sector_t sector_start;
- unsigned long sector_count;
-
- unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
- unsigned char cmd_len;
- unsigned char cmnd[MAX_COMMAND_SIZE];
-
- struct hv_storvsc_request request;
-};
-
-/* Per device structure */
-struct block_device_context {
- /* point back to our device context */
- struct hv_device *device_ctx;
- struct kmem_cache *request_pool;
- spinlock_t lock;
- struct gendisk *gd;
- enum blkvsc_device_type device_type;
- struct list_head pending_list;
-
- unsigned char device_id[64];
- unsigned int device_id_len;
- int num_outstanding_reqs;
- int shutting_down;
- unsigned int sector_size;
- sector_t capacity;
- unsigned int port;
- unsigned char path;
- unsigned char target;
- int users;
-};
-
-
-/*
- * There is a circular dependency involving blkvsc_request_completion()
- * and blkvsc_do_request().
- */
-static void blkvsc_request_completion(struct hv_storvsc_request *request);
-
-static int blkvsc_ringbuffer_size = BLKVSC_RING_BUFFER_SIZE;
-
-module_param(blkvsc_ringbuffer_size, int, S_IRUGO);
-MODULE_PARM_DESC(ring_size, "Ring buffer size (in bytes)");
-
-/*
- * There is a circular dependency involving blkvsc_probe()
- * and block_ops.
- */
-static int blkvsc_probe(struct hv_device *dev);
-
-static int blkvsc_device_add(struct hv_device *device,
- void *additional_info)
-{
- struct storvsc_device_info *device_info;
- int ret = 0;
-
- device_info = (struct storvsc_device_info *)additional_info;
-
- device_info->ring_buffer_size = blkvsc_ringbuffer_size;
-
- ret = storvsc_dev_add(device, additional_info);
- if (ret != 0)
- return ret;
-
- /*
- * We need to use the device instance guid to set the path and target
- * id. For IDE devices, the device instance id is formatted as
- * <bus id> * - <device id> - 8899 - 000000000000.
- */
- device_info->path_id = device->dev_instance.b[3] << 24 |
- device->dev_instance.b[2] << 16 |
- device->dev_instance.b[1] << 8 |
- device->dev_instance.b[0];
-
- device_info->target_id = device->dev_instance.b[5] << 8 |
- device->dev_instance.b[4];
-
- return ret;
-}
-
-static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
- void (*request_completion)(struct hv_storvsc_request *))
-{
- struct block_device_context *blkdev = blkvsc_req->dev;
- struct hv_storvsc_request *storvsc_req;
- struct vmscsi_request *vm_srb;
- int ret;
-
-
- storvsc_req = &blkvsc_req->request;
- vm_srb = &storvsc_req->vstor_packet.vm_srb;
-
- vm_srb->data_in = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
-
- storvsc_req->on_io_completion = request_completion;
- storvsc_req->context = blkvsc_req;
-
- vm_srb->port_number = blkdev->port;
- vm_srb->path_id = blkdev->path;
- vm_srb->target_id = blkdev->target;
- vm_srb->lun = 0; /* this is not really used at all */
-
- vm_srb->cdb_length = blkvsc_req->cmd_len;
-
- memcpy(vm_srb->cdb, blkvsc_req->cmnd, vm_srb->cdb_length);
-
- storvsc_req->sense_buffer = blkvsc_req->sense_buffer;
-
- ret = storvsc_do_io(blkdev->device_ctx,
- &blkvsc_req->request);
- if (ret == 0)
- blkdev->num_outstanding_reqs++;
-
- return ret;
-}
-
-
-static int blkvsc_open(struct block_device *bdev, fmode_t mode)
-{
- struct block_device_context *blkdev = bdev->bd_disk->private_data;
- unsigned long flags;
-
- spin_lock_irqsave(&blkdev->lock, flags);
-
- blkdev->users++;
-
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- return 0;
-}
-
-
-static int blkvsc_getgeo(struct block_device *bd, struct hd_geometry *hg)
-{
- sector_t nsect = get_capacity(bd->bd_disk);
- sector_t cylinders = nsect;
-
- /*
- * We are making up these values; let us keep it simple.
- */
- hg->heads = 0xff;
- hg->sectors = 0x3f;
- sector_div(cylinders, hg->heads * hg->sectors);
- hg->cylinders = cylinders;
- if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
- hg->cylinders = 0xffff;
- return 0;
-
-}
-
-
-static void blkvsc_init_rw(struct blkvsc_request *blkvsc_req)
-{
-
- blkvsc_req->cmd_len = 16;
-
- if (rq_data_dir(blkvsc_req->req)) {
- blkvsc_req->write = 1;
- blkvsc_req->cmnd[0] = WRITE_16;
- } else {
- blkvsc_req->write = 0;
- blkvsc_req->cmnd[0] = READ_16;
- }
-
- blkvsc_req->cmnd[1] |=
- (blkvsc_req->req->cmd_flags & REQ_FUA) ? 0x8 : 0;
-
- *(unsigned long long *)&blkvsc_req->cmnd[2] =
- cpu_to_be64(blkvsc_req->sector_start);
- *(unsigned int *)&blkvsc_req->cmnd[10] =
- cpu_to_be32(blkvsc_req->sector_count);
-}
-
-
-static int blkvsc_ioctl(struct block_device *bd, fmode_t mode,
- unsigned cmd, unsigned long arg)
-{
- struct block_device_context *blkdev = bd->bd_disk->private_data;
- int ret = 0;
-
- switch (cmd) {
- case HDIO_GET_IDENTITY:
- if (copy_to_user((void __user *)arg, blkdev->device_id,
- blkdev->device_id_len))
- ret = -EFAULT;
- break;
- default:
- ret = -EINVAL;
- break;
- }
-
- return ret;
-}
-
-static void blkvsc_cmd_completion(struct hv_storvsc_request *request)
-{
- struct blkvsc_request *blkvsc_req =
- (struct blkvsc_request *)request->context;
- struct block_device_context *blkdev =
- (struct block_device_context *)blkvsc_req->dev;
- struct scsi_sense_hdr sense_hdr;
- struct vmscsi_request *vm_srb;
- unsigned long flags;
-
-
- vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
-
- spin_lock_irqsave(&blkdev->lock, flags);
- blkdev->num_outstanding_reqs--;
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- if (vm_srb->scsi_status)
- if (scsi_normalize_sense(blkvsc_req->sense_buffer,
- SCSI_SENSE_BUFFERSIZE, &sense_hdr))
- scsi_print_sense_hdr("blkvsc", &sense_hdr);
-
- complete(&blkvsc_req->request.wait_event);
-}
-
-
-static int blkvsc_do_operation(struct block_device_context *blkdev,
- enum blkvsc_op_type op)
-{
- struct blkvsc_request *blkvsc_req;
- struct page *page_buf;
- unsigned char *buf;
- unsigned char device_type;
- struct scsi_sense_hdr sense_hdr;
- struct vmscsi_request *vm_srb;
- unsigned long flags;
-
- int ret = 0;
-
- blkvsc_req = kmem_cache_zalloc(blkdev->request_pool, GFP_KERNEL);
- if (!blkvsc_req)
- return -ENOMEM;
-
- page_buf = alloc_page(GFP_KERNEL);
- if (!page_buf) {
- kmem_cache_free(blkdev->request_pool, blkvsc_req);
- return -ENOMEM;
- }
-
- vm_srb = &blkvsc_req->request.vstor_packet.vm_srb;
- init_completion(&blkvsc_req->request.wait_event);
- blkvsc_req->dev = blkdev;
- blkvsc_req->req = NULL;
- blkvsc_req->write = 0;
-
- blkvsc_req->request.data_buffer.pfn_array[0] =
- page_to_pfn(page_buf);
- blkvsc_req->request.data_buffer.offset = 0;
-
- switch (op) {
- case DO_INQUIRY:
- blkvsc_req->cmnd[0] = INQUIRY;
- blkvsc_req->cmnd[1] = 0x1; /* Get product data */
- blkvsc_req->cmnd[2] = 0x83; /* mode page 83 */
- blkvsc_req->cmnd[4] = 64;
- blkvsc_req->cmd_len = 6;
- blkvsc_req->request.data_buffer.len = 64;
- break;
-
- case DO_CAPACITY:
- blkdev->sector_size = 0;
- blkdev->capacity = 0;
-
- blkvsc_req->cmnd[0] = READ_CAPACITY;
- blkvsc_req->cmd_len = 16;
- blkvsc_req->request.data_buffer.len = 8;
- break;
-
- case DO_FLUSH:
- blkvsc_req->cmnd[0] = SYNCHRONIZE_CACHE;
- blkvsc_req->cmd_len = 10;
- blkvsc_req->request.data_buffer.pfn_array[0] = 0;
- blkvsc_req->request.data_buffer.len = 0;
- break;
- default:
- ret = -EINVAL;
- goto cleanup;
- }
-
- spin_lock_irqsave(&blkdev->lock, flags);
- blkvsc_submit_request(blkvsc_req, blkvsc_cmd_completion);
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- wait_for_completion_interruptible(&blkvsc_req->request.wait_event);
-
- /* check error */
- if (vm_srb->scsi_status) {
- scsi_normalize_sense(blkvsc_req->sense_buffer,
- SCSI_SENSE_BUFFERSIZE, &sense_hdr);
-
- return 0;
- }
-
- buf = kmap(page_buf);
-
- switch (op) {
- case DO_INQUIRY:
- device_type = buf[0] & 0x1F;
-
- if (device_type == 0x0)
- blkdev->device_type = HARDDISK_TYPE;
- else
- blkdev->device_type = UNKNOWN_DEV_TYPE;
-
- blkdev->device_id_len = buf[7];
- if (blkdev->device_id_len > 64)
- blkdev->device_id_len = 64;
-
- memcpy(blkdev->device_id, &buf[8], blkdev->device_id_len);
- break;
-
- case DO_CAPACITY:
- /* be to le */
- blkdev->capacity =
- ((buf[0] << 24) | (buf[1] << 16) |
- (buf[2] << 8) | buf[3]) + 1;
-
- blkdev->sector_size =
- (buf[4] << 24) | (buf[5] << 16) |
- (buf[6] << 8) | buf[7];
- break;
- default:
- break;
-
- }
-
-cleanup:
-
- kunmap(page_buf);
-
- __free_page(page_buf);
-
- kmem_cache_free(blkdev->request_pool, blkvsc_req);
-
- return ret;
-}
-
-
-static int blkvsc_cancel_pending_reqs(struct block_device_context *blkdev)
-{
- struct blkvsc_request *pend_req, *tmp;
- struct blkvsc_request *comp_req, *tmp2;
- struct vmscsi_request *vm_srb;
-
- int ret = 0;
-
-
- /* Flush the pending list first */
- list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
- pend_entry) {
- /*
- * The pend_req could be part of a partially completed
- * request. If so, complete those req first until we
- * hit the pend_req
- */
- list_for_each_entry_safe(comp_req, tmp2,
- &pend_req->group->blkvsc_req_list,
- req_entry) {
-
- if (comp_req == pend_req)
- break;
-
- list_del(&comp_req->req_entry);
-
- if (comp_req->req) {
- vm_srb =
- &comp_req->request.vstor_packet.
- vm_srb;
- ret = __blk_end_request(comp_req->req,
- (!vm_srb->scsi_status ? 0 : -EIO),
- comp_req->sector_count *
- blkdev->sector_size);
-
- /* FIXME: shouldn't this do more than return? */
- if (ret)
- goto out;
- }
-
- kmem_cache_free(blkdev->request_pool, comp_req);
- }
-
- list_del(&pend_req->pend_entry);
-
- list_del(&pend_req->req_entry);
-
- if (comp_req->req) {
- if (!__blk_end_request(pend_req->req, -EIO,
- pend_req->sector_count *
- blkdev->sector_size)) {
- /*
- * All the sectors have been xferred ie the
- * request is done
- */
- kmem_cache_free(blkdev->request_pool,
- pend_req->group);
- }
- }
-
- kmem_cache_free(blkdev->request_pool, pend_req);
- }
-
-out:
- return ret;
-}
-
-
-/*
- * blkvsc_remove() - Callback when our device is removed
- */
-static int blkvsc_remove(struct hv_device *dev)
-{
- struct block_device_context *blkdev = dev_get_drvdata(&dev->device);
- unsigned long flags;
-
-
- /* Get to a known state */
- spin_lock_irqsave(&blkdev->lock, flags);
-
- blkdev->shutting_down = 1;
-
- blk_stop_queue(blkdev->gd->queue);
-
- blkvsc_cancel_pending_reqs(blkdev);
-
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- blkvsc_do_operation(blkdev, DO_FLUSH);
-
- if (blkdev->users == 0) {
- del_gendisk(blkdev->gd);
- put_disk(blkdev->gd);
- blk_cleanup_queue(blkdev->gd->queue);
-
- storvsc_dev_remove(blkdev->device_ctx);
-
- kmem_cache_destroy(blkdev->request_pool);
- kfree(blkdev);
- }
-
- return 0;
-}
-
-static void blkvsc_shutdown(struct hv_device *dev)
-{
- struct block_device_context *blkdev = dev_get_drvdata(&dev->device);
- unsigned long flags;
-
- if (!blkdev)
- return;
-
- spin_lock_irqsave(&blkdev->lock, flags);
-
- blkdev->shutting_down = 1;
-
- blk_stop_queue(blkdev->gd->queue);
-
- blkvsc_cancel_pending_reqs(blkdev);
-
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- blkvsc_do_operation(blkdev, DO_FLUSH);
-
- /*
- * Now wait for all outgoing I/O to be drained.
- */
- storvsc_wait_to_drain((struct storvsc_device *)dev->ext);
-
-}
-
-static int blkvsc_release(struct gendisk *disk, fmode_t mode)
-{
- struct block_device_context *blkdev = disk->private_data;
- unsigned long flags;
-
- spin_lock_irqsave(&blkdev->lock, flags);
-
- if ((--blkdev->users == 0) && (blkdev->shutting_down)) {
- blk_stop_queue(blkdev->gd->queue);
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- blkvsc_do_operation(blkdev, DO_FLUSH);
- del_gendisk(blkdev->gd);
- put_disk(blkdev->gd);
- blk_cleanup_queue(blkdev->gd->queue);
-
- storvsc_dev_remove(blkdev->device_ctx);
-
- kmem_cache_destroy(blkdev->request_pool);
- kfree(blkdev);
- } else
- spin_unlock_irqrestore(&blkdev->lock, flags);
-
- return 0;
-}
-
-
-/*
- * We break the request into 1 or more blkvsc_requests and submit
- * them. If we cant submit them all, we put them on the
- * pending_list. The blkvsc_request() will work on the pending_list.
- */
-static int blkvsc_do_request(struct block_device_context *blkdev,
- struct request *req)
-{
- struct bio *bio = NULL;
- struct bio_vec *bvec = NULL;
- struct bio_vec *prev_bvec = NULL;
- struct blkvsc_request *blkvsc_req = NULL;
- struct blkvsc_request *tmp;
- int databuf_idx = 0;
- int seg_idx = 0;
- sector_t start_sector;
- unsigned long num_sectors = 0;
- int ret = 0;
- int pending = 0;
- struct blkvsc_request_group *group = NULL;
-
- /* Create a group to tie req to list of blkvsc_reqs */
- group = kmem_cache_zalloc(blkdev->request_pool, GFP_ATOMIC);
- if (!group)
- return -ENOMEM;
-
- INIT_LIST_HEAD(&group->blkvsc_req_list);
- group->outstanding = group->status = 0;
-
- start_sector = blk_rq_pos(req);
-
- /* foreach bio in the request */
- if (req->bio) {
- for (bio = req->bio; bio; bio = bio->bi_next) {
- /*
- * Map this bio into an existing or new storvsc request
- */
- bio_for_each_segment(bvec, bio, seg_idx) {
- /* Get a new storvsc request */
- /* 1st-time */
- if ((!blkvsc_req) ||
- (databuf_idx >= MAX_MULTIPAGE_BUFFER_COUNT)
- /* hole at the begin of page */
- || (bvec->bv_offset != 0) ||
- /* hold at the end of page */
- (prev_bvec &&
- (prev_bvec->bv_len != PAGE_SIZE))) {
- /* submit the prev one */
- if (blkvsc_req) {
- blkvsc_req->sector_start =
- start_sector;
- sector_div(
- blkvsc_req->sector_start,
- (blkdev->sector_size >> 9));
-
- blkvsc_req->sector_count =
- num_sectors /
- (blkdev->sector_size >> 9);
- blkvsc_init_rw(blkvsc_req);
- }
-
- /*
- * Create new blkvsc_req to represent
- * the current bvec
- */
- blkvsc_req =
- kmem_cache_zalloc(
- blkdev->request_pool, GFP_ATOMIC);
- if (!blkvsc_req) {
- /* free up everything */
- list_for_each_entry_safe(
- blkvsc_req, tmp,
- &group->blkvsc_req_list,
- req_entry) {
- list_del(
- &blkvsc_req->req_entry);
- kmem_cache_free(
- blkdev->request_pool,
- blkvsc_req);
- }
-
- kmem_cache_free(
- blkdev->request_pool, group);
- return -ENOMEM;
- }
-
- memset(blkvsc_req, 0,
- sizeof(struct blkvsc_request));
-
- blkvsc_req->dev = blkdev;
- blkvsc_req->req = req;
- blkvsc_req->request.
- data_buffer.offset
- = bvec->bv_offset;
- blkvsc_req->request.
- data_buffer.len = 0;
-
- /* Add to the group */
- blkvsc_req->group = group;
- blkvsc_req->group->outstanding++;
- list_add_tail(&blkvsc_req->req_entry,
- &blkvsc_req->group->blkvsc_req_list);
-
- start_sector += num_sectors;
- num_sectors = 0;
- databuf_idx = 0;
- }
-
- /*
- * Add the curr bvec/segment to the curr
- * blkvsc_req
- */
- blkvsc_req->request.data_buffer.
- pfn_array[databuf_idx]
- = page_to_pfn(bvec->bv_page);
- blkvsc_req->request.data_buffer.len
- += bvec->bv_len;
-
- prev_bvec = bvec;
-
- databuf_idx++;
- num_sectors += bvec->bv_len >> 9;
-
- } /* bio_for_each_segment */
-
- } /* rq_for_each_bio */
- }
-
- /* Handle the last one */
- if (blkvsc_req) {
- blkvsc_req->sector_start = start_sector;
- sector_div(blkvsc_req->sector_start,
- (blkdev->sector_size >> 9));
-
- blkvsc_req->sector_count = num_sectors /
- (blkdev->sector_size >> 9);
-
- blkvsc_init_rw(blkvsc_req);
- }
-
- list_for_each_entry(blkvsc_req, &group->blkvsc_req_list, req_entry) {
- if (pending) {
-
- list_add_tail(&blkvsc_req->pend_entry,
- &blkdev->pending_list);
- } else {
- ret = blkvsc_submit_request(blkvsc_req,
- blkvsc_request_completion);
- if (ret == -EAGAIN) {
- pending = 1;
- list_add_tail(&blkvsc_req->pend_entry,
- &blkdev->pending_list);
- }
-
- }
- }
-
- return pending;
-}
-
-static int blkvsc_do_pending_reqs(struct block_device_context *blkdev)
-{
- struct blkvsc_request *pend_req, *tmp;
- int ret = 0;
-
- /* Flush the pending list first */
- list_for_each_entry_safe(pend_req, tmp, &blkdev->pending_list,
- pend_entry) {
-
- ret = blkvsc_submit_request(pend_req,
- blkvsc_request_completion);
- if (ret != 0)
- break;
- else
- list_del(&pend_req->pend_entry);
- }
-
- return ret;
-}
-
-
-static void blkvsc_request(struct request_queue *queue)
-{
- struct block_device_context *blkdev = NULL;
- struct request *req;
- int ret = 0;
-
- while ((req = blk_peek_request(queue)) != NULL) {
-
- blkdev = req->rq_disk->private_data;
- if (blkdev->shutting_down || req->cmd_type != REQ_TYPE_FS) {
- __blk_end_request_cur(req, 0);
- continue;
- }
-
- ret = blkvsc_do_pending_reqs(blkdev);
-
- if (ret != 0) {
- blk_stop_queue(queue);
- break;
- }
-
- blk_start_request(req);
-
- ret = blkvsc_do_request(blkdev, req);
- if (ret > 0) {
- blk_stop_queue(queue);
- break;
- } else if (ret < 0) {
- blk_requeue_request(queue, req);
- blk_stop_queue(queue);
- break;
- }
- }
-}
-
-static const struct hv_vmbus_device_id id_table[] = {
- /* IDE guid */
- { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
- 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) },
- { },
-};
-
-MODULE_DEVICE_TABLE(vmbus, id_table);
-
-/* The one and only one */
-static struct hv_driver blkvsc_drv = {
- .name = "blkvsc",
- .id_table = id_table,
- .probe = blkvsc_probe,
- .remove = blkvsc_remove,
- .shutdown = blkvsc_shutdown,
-};
-
-static const struct block_device_operations block_ops = {
- .owner = THIS_MODULE,
- .open = blkvsc_open,
- .release = blkvsc_release,
- .getgeo = blkvsc_getgeo,
- .ioctl = blkvsc_ioctl,
-};
-
-/*
- * blkvsc_drv_init - BlkVsc driver initialization.
- */
-static int blkvsc_drv_init(void)
-{
- BUILD_BUG_ON(sizeof(sector_t) != 8);
- return vmbus_driver_register(&blkvsc_drv);
-}
-
-static void blkvsc_drv_exit(void)
-{
- vmbus_driver_unregister(&blkvsc_drv);
-}
-
-/*
- * blkvsc_probe - Add a new device for this driver
- */
-static int blkvsc_probe(struct hv_device *dev)
-{
- struct block_device_context *blkdev = NULL;
- struct storvsc_device_info device_info;
- struct storvsc_major_info major_info;
- int ret = 0;
-
- blkdev = kzalloc(sizeof(struct block_device_context), GFP_KERNEL);
- if (!blkdev) {
- ret = -ENOMEM;
- goto cleanup;
- }
-
- INIT_LIST_HEAD(&blkdev->pending_list);
-
- /* Initialize what we can here */
- spin_lock_init(&blkdev->lock);
-
-
- blkdev->request_pool = kmem_cache_create(dev_name(&dev->device),
- sizeof(struct blkvsc_request), 0,
- SLAB_HWCACHE_ALIGN, NULL);
- if (!blkdev->request_pool) {
- ret = -ENOMEM;
- goto cleanup;
- }
-
-
- ret = blkvsc_device_add(dev, &device_info);
- if (ret != 0)
- goto cleanup;
-
- blkdev->device_ctx = dev;
- /* this identified the device 0 or 1 */
- blkdev->target = device_info.target_id;
- /* this identified the ide ctrl 0 or 1 */
- blkdev->path = device_info.path_id;
-
- dev_set_drvdata(&dev->device, blkdev);
-
- ret = storvsc_get_major_info(&device_info, &major_info);
-
- if (ret)
- goto cleanup;
-
- if (major_info.do_register) {
- ret = register_blkdev(major_info.major, major_info.devname);
-
- if (ret != 0) {
- DPRINT_ERR(BLKVSC_DRV,
- "register_blkdev() failed! ret %d", ret);
- goto remove;
- }
- }
-
- DPRINT_INFO(BLKVSC_DRV, "blkvsc registered for major %d!!",
- major_info.major);
-
- blkdev->gd = alloc_disk(BLKVSC_MINORS);
- if (!blkdev->gd) {
- ret = -1;
- goto cleanup;
- }
-
- blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
-
- blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
- blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
- blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
- blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
- blk_queue_dma_alignment(blkdev->gd->queue, 511);
-
- blkdev->gd->major = major_info.major;
- if (major_info.index == 1 || major_info.index == 3)
- blkdev->gd->first_minor = BLKVSC_MINORS;
- else
- blkdev->gd->first_minor = 0;
- blkdev->gd->fops = &block_ops;
- blkdev->gd->private_data = blkdev;
- blkdev->gd->driverfs_dev = &(blkdev->device_ctx->device);
- sprintf(blkdev->gd->disk_name, "hd%c", 'a' + major_info.index);
-
- blkvsc_do_operation(blkdev, DO_INQUIRY);
- blkvsc_do_operation(blkdev, DO_CAPACITY);
-
- set_capacity(blkdev->gd, blkdev->capacity * (blkdev->sector_size/512));
- blk_queue_logical_block_size(blkdev->gd->queue, blkdev->sector_size);
- /* go! */
- add_disk(blkdev->gd);
-
- DPRINT_INFO(BLKVSC_DRV, "%s added!! capacity %lu sector_size %d",
- blkdev->gd->disk_name, (unsigned long)blkdev->capacity,
- blkdev->sector_size);
-
- return ret;
-
-remove:
- storvsc_dev_remove(dev);
-
-cleanup:
- if (blkdev) {
- if (blkdev->request_pool) {
- kmem_cache_destroy(blkdev->request_pool);
- blkdev->request_pool = NULL;
- }
- kfree(blkdev);
- blkdev = NULL;
- }
-
- return ret;
-}
-
-static void blkvsc_request_completion(struct hv_storvsc_request *request)
-{
- struct blkvsc_request *blkvsc_req =
- (struct blkvsc_request *)request->context;
- struct block_device_context *blkdev =
- (struct block_device_context *)blkvsc_req->dev;
- unsigned long flags;
- struct blkvsc_request *comp_req, *tmp;
- struct vmscsi_request *vm_srb;
-
-
- spin_lock_irqsave(&blkdev->lock, flags);
-
- blkdev->num_outstanding_reqs--;
- blkvsc_req->group->outstanding--;
-
- /*
- * Only start processing when all the blkvsc_reqs are
- * completed. This guarantees no out-of-order blkvsc_req
- * completion when calling end_that_request_first()
- */
- if (blkvsc_req->group->outstanding == 0) {
- list_for_each_entry_safe(comp_req, tmp,
- &blkvsc_req->group->blkvsc_req_list,
- req_entry) {
-
- list_del(&comp_req->req_entry);
-
- vm_srb =
- &comp_req->request.vstor_packet.vm_srb;
- if (!__blk_end_request(comp_req->req,
- (!vm_srb->scsi_status ? 0 : -EIO),
- comp_req->sector_count * blkdev->sector_size)) {
- /*
- * All the sectors have been xferred ie the
- * request is done
- */
- kmem_cache_free(blkdev->request_pool,
- comp_req->group);
- }
-
- kmem_cache_free(blkdev->request_pool, comp_req);
- }
-
- if (!blkdev->shutting_down) {
- blkvsc_do_pending_reqs(blkdev);
- blk_start_queue(blkdev->gd->queue);
- blkvsc_request(blkdev->gd->queue);
- }
- }
-
- spin_unlock_irqrestore(&blkdev->lock, flags);
-}
-
-static void __exit blkvsc_exit(void)
-{
- blkvsc_drv_exit();
-}
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(HV_DRV_VERSION);
-MODULE_DESCRIPTION("Microsoft Hyper-V virtual block driver");
-module_init(blkvsc_drv_init);
-module_exit(blkvsc_exit);
git.openpandora.org / pandora-kernel.git / commitdiff