path: root/drivers/hv/channel_mgmt.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2009, Microsoft Corporation.
 *
 * 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/cpu.h>
#include <linux/hyperv.h>
#include <asm/mshyperv.h>

#include "hyperv_vmbus.h"

static void init_vp_index(struct vmbus_channel *channel);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

static const struct {
	guid_t 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);
	channel->rescind = true;
	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 guid_t *guid)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++)
		if (guid_equal(guid, &vmbus_unsupported_devs[i].guid))
			return true;
	return false;
}

static u16 hv_get_dev_type(const struct vmbus_channel *channel)
{
	const guid_t *guid = &channel->offermsg.offer.if_type;
	u16 i;

	if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid))
		return HV_UNKNOWN;

	for (i = HV_IDE; i < HV_UNKNOWN; i++) {
		if (guid_equal(guid, &vmbus_devs[i].guid))
			return i;
	}
	pr_info("Unknown GUID: %pUl\n", guid);
	return i;
}

/**
 * vmbus_prep_negotiate_resp() - Create default response for Negotiate message
 * @icmsghdrp: Pointer to msg header structure
 * @buf: Raw buffer channel data
 * @buflen: Length of the raw buffer channel data.
 * @fw_version: The framework versions we can support.
 * @fw_vercnt: The size of @fw_version.
 * @srv_version: The service versions we can support.
 * @srv_vercnt: The size of @srv_version.
 * @nego_fw_version: The selected framework version.
 * @nego_srv_version: The selected service version.
 *
 * Note: Versions are given in decreasing order.
 *
 * Set up and fill in default negotiate response message.
 * Mainly used by Hyper-V drivers.
 */
bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf,
				u32 buflen, const int *fw_version, int fw_vercnt,
				const int *srv_version, int srv_vercnt,
				int *nego_fw_version, int *nego_srv_version)
{
	int icframe_m