path: root/drivers/hv/channel_mgmt.c

/*
 * 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>
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/hyperv.h>

#include "hyperv_vmbus.h"

static void init_vp_index(struct vmbus_channel *channel, u16 dev_type);

static const struct vmbus_device vmbus_devs[] = {
	/* IDE */
	{ .dev_type = HV_IDE,
	  HV_IDE_GUID,
	  .perf_device = true,
	},

	/* SCSI */
	{ .dev_type = HV_SCSI,
	  HV_SCSI_GUID,
	  .perf_device = true,
	},

	/* Fibre Channel */
	{ .dev_type = HV_FC,
	  HV_SYNTHFC_GUID,
	  .perf_device = true,
	},

	/* Synthetic NIC */
	{ .dev_type = HV_NIC,
	  HV_NIC_GUID,
	  .perf_device = true,
	},

	/* Network Direct */
	{ .dev_type = HV_ND,
	  HV_ND_GUID,
	  .perf_device = true,
	},

	/* PCIE */
	{ .dev_type = HV_PCIE,
	  HV_PCIE_GUID,
	  .perf_device = true,
	},

	/* Synthetic Frame Buffer */
	{ .dev_type = HV_FB,
	  HV_SYNTHVID_GUID,
	  .perf_device = false,
	},

	/* Synthetic Keyboard */
	{ .dev_type = HV_KBD,
	  HV_KBD_GUID,
	  .perf_device = false,
	},

	/* Synthetic MOUSE */
	{ .dev_type = HV_MOUSE,
	  HV_MOUSE_GUID,
	  .perf_device = false,
	},

	/* KVP */
	{ .dev_type = HV_KVP,
	  HV_KVP_GUID,
	  .perf_device = false,
	},

	/* Time Synch */
	{ .dev_type = HV_TS,
	  HV_TS_GUID,
	  .perf_device = false,
	},

	/* Heartbeat */
	{ .dev_type = HV_HB,
	  HV_HEART_BEAT_GUID,
	  .perf_device = false,
	},

	/* Shutdown */
	{ .dev_type = HV_SHUTDOWN,
	  HV_SHUTDOWN_GUID,
	  .perf_device = false,
	},

	/* File copy */
	{ .dev_type = HV_FCOPY,
	  HV_FCOPY_GUID,
	  .perf_device = false,
	},

	/* Backup */
	{ .dev_type = HV_BACKUP,
	  HV_VSS_GUID,
	  .perf_device = false,
	},

	/* Dynamic Memory */
	{ .dev_type = HV_DM,
	  HV_DM_GUID,
	  .perf_device = false,
	},

	/* Unknown GUID */
	{ .dev_type = HV_UNKOWN,
	  .perf_device = false,
	},
};

static const struct {
	uuid_le guid;
} vmbus_unsupported_devs[] = {
	{ HV_AVMA1_GUID },
	{ HV_AVMA2_GUID },
	{ HV_RDV_GUID	},
};

/*
 * The rescinded channel may be blocked waiting for a response from the host;
 * take care of that.
 */
static void vmbus_rescind_cleanup(struct vmbus_channel *channel)
{
	struct vmbus_channel_msginfo *msginfo;
	unsigned long flags;


	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);

	list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
				msglistentry) {

		if (msginfo->waiting_channel == channel) {
			complete(&msginfo->waitevent);
			break;
		}
	}
	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
}

static bool is_unsupported_vmbus_devs(const uuid_le *guid)
{
	int i;

	for (i <