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Staging: hv: storvsc: Add code to handle IDE devices using the storvsc driver

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Add code to handle IDE devices using the storvsc driver. The storvsc_probe()
is modified so that the storvsc driver can surface all disks presented to the
guest as scsi devices using generic upper level Linux scsi drivers.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-08-27 11:31:17 -07:00 committed by Greg Kroah-Hartman
parent 9d88f33a15
commit bd1f5d6a00
1 changed files with 52 additions and 8 deletions
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60
drivers/staging/hv/storvsc_drv.c
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@ -59,6 +59,17 @@ struct storvsc_cmd_request {
struct hv_storvsc_request request;
};
static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path)
{
*target =
dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4];
*path =
dev->dev_instance.b[3] << 24 |
dev->dev_instance.b[2] << 16 |
dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0];
}
static int storvsc_device_alloc(struct scsi_device *sdevice)
{
@ -642,6 +653,20 @@ static const struct hv_vmbus_device_id id_table[] = {
};
MODULE_DEVICE_TABLE(vmbus, id_table);
/*
* This declaration is temporary; once we get the
* infrastructure in place, we will integrate with
* id_table.
*/
static const uuid_le ide_blk_guid = {
.b = {
0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
}
};
/*
* storvsc_probe - Add a new device for this driver
*/
@ -652,6 +677,14 @@ static int storvsc_probe(struct hv_device *device)
struct Scsi_Host *host;
struct hv_host_device *host_dev;
struct storvsc_device_info device_info;
bool dev_is_ide;
int path = 0;
int target = 0;
if (!uuid_le_cmp(device->dev_type, ide_blk_guid))
dev_is_ide = true;
else
dev_is_ide = false;
host = scsi_host_alloc(&scsi_driver,
sizeof(struct hv_host_device));
@ -687,6 +720,9 @@ static int storvsc_probe(struct hv_device *device)
return -ENODEV;
}
if (dev_is_ide)
storvsc_get_ide_info(device, &target, &path);
host_dev->path = device_info.path_id;
host_dev->target = device_info.target_id;
@ -699,17 +735,25 @@ static int storvsc_probe(struct hv_device *device)
/* Register the HBA and start the scsi bus scan */
ret = scsi_add_host(host, &device->device);
if (ret != 0) {
if (ret != 0)
goto err_out;
storvsc_dev_remove(device);
kmem_cache_destroy(host_dev->request_pool);
scsi_host_put(host);
return -ENODEV;
if (!dev_is_ide) {
scsi_scan_host(host);
return 0;
}
ret = scsi_add_device(host, 0, target, 0);
if (ret) {
scsi_remove_host(host);
goto err_out;
}
return 0;
scsi_scan_host(host);
return ret;
err_out:
storvsc_dev_remove(device);
kmem_cache_destroy(host_dev->request_pool);
scsi_host_put(host);
return -ENODEV;
}
/* The one and only one */