forked from Minki/linux
238064f13d
The pci-hyperv driver's channel callback hv_pci_onchannelcallback() is not really a hot path, so we don't need to mark it as a perf_device, meaning with this patch all HV_PCIE channels' target_cpu will be CPU0. Signed-off-by: Dexuan Cui <decui@microsoft.com> Cc: stable@vger.kernel.org Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1336 lines
34 KiB
C
1336 lines
34 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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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/hyperv.h>
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#include <asm/mshyperv.h>
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#include "hyperv_vmbus.h"
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static void init_vp_index(struct vmbus_channel *channel, u16 dev_type);
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static const struct vmbus_device vmbus_devs[] = {
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/* IDE */
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{ .dev_type = HV_IDE,
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HV_IDE_GUID,
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.perf_device = true,
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},
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/* SCSI */
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{ .dev_type = HV_SCSI,
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HV_SCSI_GUID,
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.perf_device = true,
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},
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/* Fibre Channel */
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{ .dev_type = HV_FC,
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HV_SYNTHFC_GUID,
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.perf_device = true,
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},
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/* Synthetic NIC */
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{ .dev_type = HV_NIC,
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HV_NIC_GUID,
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.perf_device = true,
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},
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/* Network Direct */
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{ .dev_type = HV_ND,
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HV_ND_GUID,
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.perf_device = true,
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},
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/* PCIE */
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{ .dev_type = HV_PCIE,
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HV_PCIE_GUID,
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.perf_device = false,
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},
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/* Synthetic Frame Buffer */
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{ .dev_type = HV_FB,
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HV_SYNTHVID_GUID,
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.perf_device = false,
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},
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/* Synthetic Keyboard */
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{ .dev_type = HV_KBD,
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HV_KBD_GUID,
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.perf_device = false,
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},
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/* Synthetic MOUSE */
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{ .dev_type = HV_MOUSE,
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HV_MOUSE_GUID,
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.perf_device = false,
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},
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/* KVP */
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{ .dev_type = HV_KVP,
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HV_KVP_GUID,
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.perf_device = false,
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},
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/* Time Synch */
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{ .dev_type = HV_TS,
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HV_TS_GUID,
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.perf_device = false,
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},
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/* Heartbeat */
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{ .dev_type = HV_HB,
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HV_HEART_BEAT_GUID,
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.perf_device = false,
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},
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/* Shutdown */
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{ .dev_type = HV_SHUTDOWN,
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HV_SHUTDOWN_GUID,
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.perf_device = false,
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},
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/* File copy */
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{ .dev_type = HV_FCOPY,
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HV_FCOPY_GUID,
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.perf_device = false,
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},
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/* Backup */
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{ .dev_type = HV_BACKUP,
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HV_VSS_GUID,
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.perf_device = false,
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},
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/* Dynamic Memory */
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{ .dev_type = HV_DM,
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HV_DM_GUID,
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.perf_device = false,
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},
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/* Unknown GUID */
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{ .dev_type = HV_UNKNOWN,
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.perf_device = false,
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},
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};
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static const struct {
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uuid_le guid;
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} vmbus_unsupported_devs[] = {
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{ HV_AVMA1_GUID },
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{ HV_AVMA2_GUID },
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{ HV_RDV_GUID },
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};
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/*
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* The rescinded channel may be blocked waiting for a response from the host;
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* take care of that.
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*/
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static void vmbus_rescind_cleanup(struct vmbus_channel *channel)
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{
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struct vmbus_channel_msginfo *msginfo;
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unsigned long flags;
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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channel->rescind = true;
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list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
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msglistentry) {
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if (msginfo->waiting_channel == channel) {
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complete(&msginfo->waitevent);
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break;
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}
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}
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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}
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static bool is_unsupported_vmbus_devs(const uuid_le *guid)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++)
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if (!uuid_le_cmp(*guid, vmbus_unsupported_devs[i].guid))
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return true;
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return false;
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}
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static u16 hv_get_dev_type(const struct vmbus_channel *channel)
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{
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const uuid_le *guid = &channel->offermsg.offer.if_type;
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u16 i;
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if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid))
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return HV_UNKNOWN;
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for (i = HV_IDE; i < HV_UNKNOWN; i++) {
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if (!uuid_le_cmp(*guid, vmbus_devs[i].guid))
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return i;
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}
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pr_info("Unknown GUID: %pUl\n", guid);
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return i;
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}
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/**
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* vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
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* @icmsghdrp: Pointer to msg header structure
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* @icmsg_negotiate: Pointer to negotiate message structure
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* @buf: Raw buffer channel data
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*
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* @icmsghdrp is of type &struct icmsg_hdr.
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* Set up and fill in default negotiate response message.
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*
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* The fw_version and fw_vercnt specifies the framework version that
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* we can support.
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*
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* The srv_version and srv_vercnt specifies the service
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* versions we can support.
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*
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* Versions are given in decreasing order.
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*
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* nego_fw_version and nego_srv_version store the selected protocol versions.
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*
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* Mainly used by Hyper-V drivers.
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*/
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bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
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u8 *buf, const int *fw_version, int fw_vercnt,
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const int *srv_version, int srv_vercnt,
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int *nego_fw_version, int *nego_srv_version)
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{
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int icframe_major, icframe_minor;
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int icmsg_major, icmsg_minor;
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int fw_major, fw_minor;
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int srv_major, srv_minor;
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int i, j;
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bool found_match = false;
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struct icmsg_negotiate *negop;
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icmsghdrp->icmsgsize = 0x10;
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negop = (struct icmsg_negotiate *)&buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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icframe_major = negop->icframe_vercnt;
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icframe_minor = 0;
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icmsg_major = negop->icmsg_vercnt;
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icmsg_minor = 0;
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/*
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* Select the framework version number we will
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* support.
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*/
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for (i = 0; i < fw_vercnt; i++) {
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fw_major = (fw_version[i] >> 16);
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fw_minor = (fw_version[i] & 0xFFFF);
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for (j = 0; j < negop->icframe_vercnt; j++) {
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if ((negop->icversion_data[j].major == fw_major) &&
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(negop->icversion_data[j].minor == fw_minor)) {
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icframe_major = negop->icversion_data[j].major;
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icframe_minor = negop->icversion_data[j].minor;
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found_match = true;
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break;
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}
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}
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if (found_match)
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break;
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}
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if (!found_match)
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goto fw_error;
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found_match = false;
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for (i = 0; i < srv_vercnt; i++) {
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srv_major = (srv_version[i] >> 16);
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srv_minor = (srv_version[i] & 0xFFFF);
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for (j = negop->icframe_vercnt;
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(j < negop->icframe_vercnt + negop->icmsg_vercnt);
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j++) {
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if ((negop->icversion_data[j].major == srv_major) &&
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(negop->icversion_data[j].minor == srv_minor)) {
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icmsg_major = negop->icversion_data[j].major;
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icmsg_minor = negop->icversion_data[j].minor;
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found_match = true;
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break;
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}
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}
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if (found_match)
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break;
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}
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/*
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* Respond with the framework and service
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* version numbers we can support.
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*/
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fw_error:
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if (!found_match) {
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negop->icframe_vercnt = 0;
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negop->icmsg_vercnt = 0;
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} else {
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negop->icframe_vercnt = 1;
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negop->icmsg_vercnt = 1;
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}
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if (nego_fw_version)
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*nego_fw_version = (icframe_major << 16) | icframe_minor;
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if (nego_srv_version)
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*nego_srv_version = (icmsg_major << 16) | icmsg_minor;
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negop->icversion_data[0].major = icframe_major;
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negop->icversion_data[0].minor = icframe_minor;
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negop->icversion_data[1].major = icmsg_major;
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negop->icversion_data[1].minor = icmsg_minor;
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return found_match;
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}
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EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
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/*
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* alloc_channel - Allocate and initialize a vmbus channel object
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*/
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static struct vmbus_channel *alloc_channel(void)
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{
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struct vmbus_channel *channel;
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channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
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if (!channel)
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return NULL;
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spin_lock_init(&channel->lock);
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init_completion(&channel->rescind_event);
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INIT_LIST_HEAD(&channel->sc_list);
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INIT_LIST_HEAD(&channel->percpu_list);
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tasklet_init(&channel->callback_event,
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vmbus_on_event, (unsigned long)channel);
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return channel;
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}
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/*
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* free_channel - Release the resources used by the vmbus channel object
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*/
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static void free_channel(struct vmbus_channel *channel)
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{
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tasklet_kill(&channel->callback_event);
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kobject_put(&channel->kobj);
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}
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static void percpu_channel_enq(void *arg)
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{
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struct vmbus_channel *channel = arg;
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struct hv_per_cpu_context *hv_cpu
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= this_cpu_ptr(hv_context.cpu_context);
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list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list);
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}
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static void percpu_channel_deq(void *arg)
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{
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struct vmbus_channel *channel = arg;
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list_del_rcu(&channel->percpu_list);
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}
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static void vmbus_release_relid(u32 relid)
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{
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struct vmbus_channel_relid_released msg;
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int ret;
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memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
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msg.child_relid = relid;
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msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
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ret = vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released),
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true);
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trace_vmbus_release_relid(&msg, ret);
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}
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void hv_process_channel_removal(u32 relid)
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{
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unsigned long flags;
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struct vmbus_channel *primary_channel, *channel;
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BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex));
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/*
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* Make sure channel is valid as we may have raced.
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*/
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channel = relid2channel(relid);
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if (!channel)
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return;
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BUG_ON(!channel->rescind);
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if (channel->target_cpu != get_cpu()) {
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put_cpu();
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smp_call_function_single(channel->target_cpu,
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percpu_channel_deq, channel, true);
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} else {
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percpu_channel_deq(channel);
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put_cpu();
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}
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if (channel->primary_channel == NULL) {
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list_del(&channel->listentry);
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primary_channel = channel;
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} else {
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primary_channel = channel->primary_channel;
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spin_lock_irqsave(&primary_channel->lock, flags);
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list_del(&channel->sc_list);
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primary_channel->num_sc--;
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spin_unlock_irqrestore(&primary_channel->lock, flags);
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}
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/*
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* We need to free the bit for init_vp_index() to work in the case
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* of sub-channel, when we reload drivers like hv_netvsc.
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*/
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if (channel->affinity_policy == HV_LOCALIZED)
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cpumask_clear_cpu(channel->target_cpu,
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&primary_channel->alloced_cpus_in_node);
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vmbus_release_relid(relid);
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free_channel(channel);
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}
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void vmbus_free_channels(void)
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{
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struct vmbus_channel *channel, *tmp;
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list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list,
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listentry) {
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/* hv_process_channel_removal() needs this */
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channel->rescind = true;
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vmbus_device_unregister(channel->device_obj);
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}
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}
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/*
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* vmbus_process_offer - Process the offer by creating a channel/device
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* associated with this offer
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*/
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static void vmbus_process_offer(struct vmbus_channel *newchannel)
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{
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struct vmbus_channel *channel;
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bool fnew = true;
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unsigned long flags;
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u16 dev_type;
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int ret;
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|
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/* Make sure this is a new offer */
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mutex_lock(&vmbus_connection.channel_mutex);
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/*
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* Now that we have acquired the channel_mutex,
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* we can release the potentially racing rescind thread.
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*/
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atomic_dec(&vmbus_connection.offer_in_progress);
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list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
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if (!uuid_le_cmp(channel->offermsg.offer.if_type,
|
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newchannel->offermsg.offer.if_type) &&
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!uuid_le_cmp(channel->offermsg.offer.if_instance,
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newchannel->offermsg.offer.if_instance)) {
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fnew = false;
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break;
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}
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}
|
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|
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if (fnew)
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list_add_tail(&newchannel->listentry,
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&vmbus_connection.chn_list);
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|
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mutex_unlock(&vmbus_connection.channel_mutex);
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|
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if (!fnew) {
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/*
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* Check to see if this is a sub-channel.
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*/
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if (newchannel->offermsg.offer.sub_channel_index != 0) {
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/*
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* Process the sub-channel.
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*/
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newchannel->primary_channel = channel;
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spin_lock_irqsave(&channel->lock, flags);
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list_add_tail(&newchannel->sc_list, &channel->sc_list);
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channel->num_sc++;
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spin_unlock_irqrestore(&channel->lock, flags);
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} else {
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goto err_free_chan;
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}
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}
|
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|
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dev_type = hv_get_dev_type(newchannel);
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init_vp_index(newchannel, dev_type);
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|
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if (newchannel->target_cpu != get_cpu()) {
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put_cpu();
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smp_call_function_single(newchannel->target_cpu,
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percpu_channel_enq,
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newchannel, true);
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} else {
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percpu_channel_enq(newchannel);
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put_cpu();
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}
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|
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/*
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* This state is used to indicate a successful open
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* so that when we do close the channel normally, we
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* can cleanup properly
|
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*/
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newchannel->state = CHANNEL_OPEN_STATE;
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|
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if (!fnew) {
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struct hv_device *dev
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= newchannel->primary_channel->device_obj;
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|
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if (vmbus_add_channel_kobj(dev, newchannel)) {
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atomic_dec(&vmbus_connection.offer_in_progress);
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goto err_free_chan;
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}
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|
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if (channel->sc_creation_callback != NULL)
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channel->sc_creation_callback(newchannel);
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newchannel->probe_done = true;
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return;
|
|
}
|
|
|
|
/*
|
|
* Start the process of binding this offer to the driver
|
|
* We need to set the DeviceObject field before calling
|
|
* vmbus_child_dev_add()
|
|
*/
|
|
newchannel->device_obj = vmbus_device_create(
|
|
&newchannel->offermsg.offer.if_type,
|
|
&newchannel->offermsg.offer.if_instance,
|
|
newchannel);
|
|
if (!newchannel->device_obj)
|
|
goto err_deq_chan;
|
|
|
|
newchannel->device_obj->device_id = dev_type;
|
|
/*
|
|
* Add the new device to the bus. This will kick off device-driver
|
|
* binding which eventually invokes the device driver's AddDevice()
|
|
* method.
|
|
*/
|
|
ret = vmbus_device_register(newchannel->device_obj);
|
|
|
|
if (ret != 0) {
|
|
pr_err("unable to add child device object (relid %d)\n",
|
|
newchannel->offermsg.child_relid);
|
|
kfree(newchannel->device_obj);
|
|
goto err_deq_chan;
|
|
}
|
|
|
|
newchannel->probe_done = true;
|
|
return;
|
|
|
|
err_deq_chan:
|
|
mutex_lock(&vmbus_connection.channel_mutex);
|
|
list_del(&newchannel->listentry);
|
|
mutex_unlock(&vmbus_connection.channel_mutex);
|
|
|
|
if (newchannel->target_cpu != get_cpu()) {
|
|
put_cpu();
|
|
smp_call_function_single(newchannel->target_cpu,
|
|
percpu_channel_deq, newchannel, true);
|
|
} else {
|
|
percpu_channel_deq(newchannel);
|
|
put_cpu();
|
|
}
|
|
|
|
vmbus_release_relid(newchannel->offermsg.child_relid);
|
|
|
|
err_free_chan:
|
|
free_channel(newchannel);
|
|
}
|
|
|
|
/*
|
|
* We use this state to statically distribute the channel interrupt load.
|
|
*/
|
|
static int next_numa_node_id;
|
|
|
|
/*
|
|
* Starting with Win8, we can statically distribute the incoming
|
|
* channel interrupt load by binding a channel to VCPU.
|
|
* We distribute the interrupt loads to one or more NUMA nodes based on
|
|
* the channel's affinity_policy.
|
|
*
|
|
* For pre-win8 hosts or non-performance critical channels we assign the
|
|
* first CPU in the first NUMA node.
|
|
*/
|
|
static void init_vp_index(struct vmbus_channel *channel, u16 dev_type)
|
|
{
|
|
u32 cur_cpu;
|
|
bool perf_chn = vmbus_devs[dev_type].perf_device;
|
|
struct vmbus_channel *primary = channel->primary_channel;
|
|
int next_node;
|
|
struct cpumask available_mask;
|
|
struct cpumask *alloced_mask;
|
|
|
|
if ((vmbus_proto_version == VERSION_WS2008) ||
|
|
(vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) {
|
|
/*
|
|
* Prior to win8, all channel interrupts are
|
|
* delivered on cpu 0.
|
|
* Also if the channel is not a performance critical
|
|
* channel, bind it to cpu 0.
|
|
*/
|
|
channel->numa_node = 0;
|
|
channel->target_cpu = 0;
|
|
channel->target_vp = hv_cpu_number_to_vp_number(0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Based on the channel affinity policy, we will assign the NUMA
|
|
* nodes.
|
|
*/
|
|
|
|
if ((channel->affinity_policy == HV_BALANCED) || (!primary)) {
|
|
while (true) {
|
|
next_node = next_numa_node_id++;
|
|
if (next_node == nr_node_ids) {
|
|
next_node = next_numa_node_id = 0;
|
|
continue;
|
|
}
|
|
if (cpumask_empty(cpumask_of_node(next_node)))
|
|
continue;
|
|
break;
|
|
}
|
|
channel->numa_node = next_node;
|
|
primary = channel;
|
|
}
|
|
alloced_mask = &hv_context.hv_numa_map[primary->numa_node];
|
|
|
|
if (cpumask_weight(alloced_mask) ==
|
|
cpumask_weight(cpumask_of_node(primary->numa_node))) {
|
|
/*
|
|
* We have cycled through all the CPUs in the node;
|
|
* reset the alloced map.
|
|
*/
|
|
cpumask_clear(alloced_mask);
|
|
}
|
|
|
|
cpumask_xor(&available_mask, alloced_mask,
|
|
cpumask_of_node(primary->numa_node));
|
|
|
|
cur_cpu = -1;
|
|
|
|
if (primary->affinity_policy == HV_LOCALIZED) {
|
|
/*
|
|
* Normally Hyper-V host doesn't create more subchannels
|
|
* than there are VCPUs on the node but it is possible when not
|
|
* all present VCPUs on the node are initialized by guest.
|
|
* Clear the alloced_cpus_in_node to start over.
|
|
*/
|
|
if (cpumask_equal(&primary->alloced_cpus_in_node,
|
|
cpumask_of_node(primary->numa_node)))
|
|
cpumask_clear(&primary->alloced_cpus_in_node);
|
|
}
|
|
|
|
while (true) {
|
|
cur_cpu = cpumask_next(cur_cpu, &available_mask);
|
|
if (cur_cpu >= nr_cpu_ids) {
|
|
cur_cpu = -1;
|
|
cpumask_copy(&available_mask,
|
|
cpumask_of_node(primary->numa_node));
|
|
continue;
|
|
}
|
|
|
|
if (primary->affinity_policy == HV_LOCALIZED) {
|
|
/*
|
|
* NOTE: in the case of sub-channel, we clear the
|
|
* sub-channel related bit(s) in
|
|
* primary->alloced_cpus_in_node in
|
|
* hv_process_channel_removal(), so when we
|
|
* reload drivers like hv_netvsc in SMP guest, here
|
|
* we're able to re-allocate
|
|
* bit from primary->alloced_cpus_in_node.
|
|
*/
|
|
if (!cpumask_test_cpu(cur_cpu,
|
|
&primary->alloced_cpus_in_node)) {
|
|
cpumask_set_cpu(cur_cpu,
|
|
&primary->alloced_cpus_in_node);
|
|
cpumask_set_cpu(cur_cpu, alloced_mask);
|
|
break;
|
|
}
|
|
} else {
|
|
cpumask_set_cpu(cur_cpu, alloced_mask);
|
|
break;
|
|
}
|
|
}
|
|
|
|
channel->target_cpu = cur_cpu;
|
|
channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu);
|
|
}
|
|
|
|
static void vmbus_wait_for_unload(void)
|
|
{
|
|
int cpu;
|
|
void *page_addr;
|
|
struct hv_message *msg;
|
|
struct vmbus_channel_message_header *hdr;
|
|
u32 message_type;
|
|
|
|
/*
|
|
* CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was
|
|
* used for initial contact or to CPU0 depending on host version. When
|
|
* we're crashing on a different CPU let's hope that IRQ handler on
|
|
* the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still
|
|
* functional and vmbus_unload_response() will complete
|
|
* vmbus_connection.unload_event. If not, the last thing we can do is
|
|
* read message pages for all CPUs directly.
|
|
*/
|
|
while (1) {
|
|
if (completion_done(&vmbus_connection.unload_event))
|
|
break;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
page_addr = hv_cpu->synic_message_page;
|
|
msg = (struct hv_message *)page_addr
|
|
+ VMBUS_MESSAGE_SINT;
|
|
|
|
message_type = READ_ONCE(msg->header.message_type);
|
|
if (message_type == HVMSG_NONE)
|
|
continue;
|
|
|
|
hdr = (struct vmbus_channel_message_header *)
|
|
msg->u.payload;
|
|
|
|
if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE)
|
|
complete(&vmbus_connection.unload_event);
|
|
|
|
vmbus_signal_eom(msg, message_type);
|
|
}
|
|
|
|
mdelay(10);
|
|
}
|
|
|
|
/*
|
|
* We're crashing and already got the UNLOAD_RESPONSE, cleanup all
|
|
* maybe-pending messages on all CPUs to be able to receive new
|
|
* messages after we reconnect.
|
|
*/
|
|
for_each_online_cpu(cpu) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
page_addr = hv_cpu->synic_message_page;
|
|
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
|
|
msg->header.message_type = HVMSG_NONE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vmbus_unload_response - Handler for the unload response.
|
|
*/
|
|
static void vmbus_unload_response(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
/*
|
|
* This is a global event; just wakeup the waiting thread.
|
|
* Once we successfully unload, we can cleanup the monitor state.
|
|
*/
|
|
complete(&vmbus_connection.unload_event);
|
|
}
|
|
|
|
void vmbus_initiate_unload(bool crash)
|
|
{
|
|
struct vmbus_channel_message_header hdr;
|
|
|
|
/* Pre-Win2012R2 hosts don't support reconnect */
|
|
if (vmbus_proto_version < VERSION_WIN8_1)
|
|
return;
|
|
|
|
init_completion(&vmbus_connection.unload_event);
|
|
memset(&hdr, 0, sizeof(struct vmbus_channel_message_header));
|
|
hdr.msgtype = CHANNELMSG_UNLOAD;
|
|
vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header),
|
|
!crash);
|
|
|
|
/*
|
|
* vmbus_initiate_unload() is also called on crash and the crash can be
|
|
* happening in an interrupt context, where scheduling is impossible.
|
|
*/
|
|
if (!crash)
|
|
wait_for_completion(&vmbus_connection.unload_event);
|
|
else
|
|
vmbus_wait_for_unload();
|
|
}
|
|
|
|
/*
|
|
* vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
|
|
*
|
|
*/
|
|
static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_offer_channel *offer;
|
|
struct vmbus_channel *newchannel;
|
|
|
|
offer = (struct vmbus_channel_offer_channel *)hdr;
|
|
|
|
trace_vmbus_onoffer(offer);
|
|
|
|
/* Allocate the channel object and save this offer. */
|
|
newchannel = alloc_channel();
|
|
if (!newchannel) {
|
|
vmbus_release_relid(offer->child_relid);
|
|
atomic_dec(&vmbus_connection.offer_in_progress);
|
|
pr_err("Unable to allocate channel object\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Setup state for signalling the host.
|
|
*/
|
|
newchannel->sig_event = VMBUS_EVENT_CONNECTION_ID;
|
|
|
|
if (vmbus_proto_version != VERSION_WS2008) {
|
|
newchannel->is_dedicated_interrupt =
|
|
(offer->is_dedicated_interrupt != 0);
|
|
newchannel->sig_event = offer->connection_id;
|
|
}
|
|
|
|
memcpy(&newchannel->offermsg, offer,
|
|
sizeof(struct vmbus_channel_offer_channel));
|
|
newchannel->monitor_grp = (u8)offer->monitorid / 32;
|
|
newchannel->monitor_bit = (u8)offer->monitorid % 32;
|
|
|
|
vmbus_process_offer(newchannel);
|
|
}
|
|
|
|
/*
|
|
* vmbus_onoffer_rescind - Rescind offer handler.
|
|
*
|
|
* We queue a work item to process this offer synchronously
|
|
*/
|
|
static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_rescind_offer *rescind;
|
|
struct vmbus_channel *channel;
|
|
struct device *dev;
|
|
|
|
rescind = (struct vmbus_channel_rescind_offer *)hdr;
|
|
|
|
trace_vmbus_onoffer_rescind(rescind);
|
|
|
|
/*
|
|
* The offer msg and the corresponding rescind msg
|
|
* from the host are guranteed to be ordered -
|
|
* offer comes in first and then the rescind.
|
|
* Since we process these events in work elements,
|
|
* and with preemption, we may end up processing
|
|
* the events out of order. Given that we handle these
|
|
* work elements on the same CPU, this is possible only
|
|
* in the case of preemption. In any case wait here
|
|
* until the offer processing has moved beyond the
|
|
* point where the channel is discoverable.
|
|
*/
|
|
|
|
while (atomic_read(&vmbus_connection.offer_in_progress) != 0) {
|
|
/*
|
|
* We wait here until any channel offer is currently
|
|
* being processed.
|
|
*/
|
|
msleep(1);
|
|
}
|
|
|
|
mutex_lock(&vmbus_connection.channel_mutex);
|
|
channel = relid2channel(rescind->child_relid);
|
|
mutex_unlock(&vmbus_connection.channel_mutex);
|
|
|
|
if (channel == NULL) {
|
|
/*
|
|
* We failed in processing the offer message;
|
|
* we would have cleaned up the relid in that
|
|
* failure path.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Now wait for offer handling to complete.
|
|
*/
|
|
vmbus_rescind_cleanup(channel);
|
|
while (READ_ONCE(channel->probe_done) == false) {
|
|
/*
|
|
* We wait here until any channel offer is currently
|
|
* being processed.
|
|
*/
|
|
msleep(1);
|
|
}
|
|
|
|
/*
|
|
* At this point, the rescind handling can proceed safely.
|
|
*/
|
|
|
|
if (channel->device_obj) {
|
|
if (channel->chn_rescind_callback) {
|
|
channel->chn_rescind_callback(channel);
|
|
return;
|
|
}
|
|
/*
|
|
* We will have to unregister this device from the
|
|
* driver core.
|
|
*/
|
|
dev = get_device(&channel->device_obj->device);
|
|
if (dev) {
|
|
vmbus_device_unregister(channel->device_obj);
|
|
put_device(dev);
|
|
}
|
|
}
|
|
if (channel->primary_channel != NULL) {
|
|
/*
|
|
* Sub-channel is being rescinded. Following is the channel
|
|
* close sequence when initiated from the driveri (refer to
|
|
* vmbus_close() for details):
|
|
* 1. Close all sub-channels first
|
|
* 2. Then close the primary channel.
|
|
*/
|
|
mutex_lock(&vmbus_connection.channel_mutex);
|
|
if (channel->state == CHANNEL_OPEN_STATE) {
|
|
/*
|
|
* The channel is currently not open;
|
|
* it is safe for us to cleanup the channel.
|
|
*/
|
|
hv_process_channel_removal(rescind->child_relid);
|
|
} else {
|
|
complete(&channel->rescind_event);
|
|
}
|
|
mutex_unlock(&vmbus_connection.channel_mutex);
|
|
}
|
|
}
|
|
|
|
void vmbus_hvsock_device_unregister(struct vmbus_channel *channel)
|
|
{
|
|
BUG_ON(!is_hvsock_channel(channel));
|
|
|
|
/* We always get a rescind msg when a connection is closed. */
|
|
while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind))
|
|
msleep(1);
|
|
|
|
vmbus_device_unregister(channel->device_obj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister);
|
|
|
|
|
|
/*
|
|
* vmbus_onoffers_delivered -
|
|
* This is invoked when all offers have been delivered.
|
|
*
|
|
* Nothing to do here.
|
|
*/
|
|
static void vmbus_onoffers_delivered(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* vmbus_onopen_result - Open result handler.
|
|
*
|
|
* This is invoked when we received a response to our channel open request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_open_result *result;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_open_channel *openmsg;
|
|
unsigned long flags;
|
|
|
|
result = (struct vmbus_channel_open_result *)hdr;
|
|
|
|
trace_vmbus_onopen_result(result);
|
|
|
|
/*
|
|
* Find the open msg, copy the result and signal/unblock the wait event
|
|
*/
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
|
|
msglistentry) {
|
|
requestheader =
|
|
(struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
|
|
openmsg =
|
|
(struct vmbus_channel_open_channel *)msginfo->msg;
|
|
if (openmsg->child_relid == result->child_relid &&
|
|
openmsg->openid == result->openid) {
|
|
memcpy(&msginfo->response.open_result,
|
|
result,
|
|
sizeof(
|
|
struct vmbus_channel_open_result));
|
|
complete(&msginfo->waitevent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* vmbus_ongpadl_created - GPADL created handler.
|
|
*
|
|
* This is invoked when we received a response to our gpadl create request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_gpadl_created *gpadlcreated;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_gpadl_header *gpadlheader;
|
|
unsigned long flags;
|
|
|
|
gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
|
|
|
|
trace_vmbus_ongpadl_created(gpadlcreated);
|
|
|
|
/*
|
|
* Find the establish msg, copy the result and signal/unblock the wait
|
|
* event
|
|
*/
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
|
|
msglistentry) {
|
|
requestheader =
|
|
(struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
|
|
gpadlheader =
|
|
(struct vmbus_channel_gpadl_header *)requestheader;
|
|
|
|
if ((gpadlcreated->child_relid ==
|
|
gpadlheader->child_relid) &&
|
|
(gpadlcreated->gpadl == gpadlheader->gpadl)) {
|
|
memcpy(&msginfo->response.gpadl_created,
|
|
gpadlcreated,
|
|
sizeof(
|
|
struct vmbus_channel_gpadl_created));
|
|
complete(&msginfo->waitevent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* vmbus_ongpadl_torndown - GPADL torndown handler.
|
|
*
|
|
* This is invoked when we received a response to our gpadl teardown request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_ongpadl_torndown(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_gpadl_torndown *gpadl_torndown;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_gpadl_teardown *gpadl_teardown;
|
|
unsigned long flags;
|
|
|
|
gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
|
|
|
|
trace_vmbus_ongpadl_torndown(gpadl_torndown);
|
|
|
|
/*
|
|
* Find the open msg, copy the result and signal/unblock the wait event
|
|
*/
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
|
|
msglistentry) {
|
|
requestheader =
|
|
(struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
|
|
gpadl_teardown =
|
|
(struct vmbus_channel_gpadl_teardown *)requestheader;
|
|
|
|
if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
|
|
memcpy(&msginfo->response.gpadl_torndown,
|
|
gpadl_torndown,
|
|
sizeof(
|
|
struct vmbus_channel_gpadl_torndown));
|
|
complete(&msginfo->waitevent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* vmbus_onversion_response - Version response handler
|
|
*
|
|
* This is invoked when we received a response to our initiate contact request.
|
|
* Find the matching request, copy the response and signal the requesting
|
|
* thread.
|
|
*/
|
|
static void vmbus_onversion_response(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
struct vmbus_channel_message_header *requestheader;
|
|
struct vmbus_channel_version_response *version_response;
|
|
unsigned long flags;
|
|
|
|
version_response = (struct vmbus_channel_version_response *)hdr;
|
|
|
|
trace_vmbus_onversion_response(version_response);
|
|
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
|
|
msglistentry) {
|
|
requestheader =
|
|
(struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
if (requestheader->msgtype ==
|
|
CHANNELMSG_INITIATE_CONTACT) {
|
|
memcpy(&msginfo->response.version_response,
|
|
version_response,
|
|
sizeof(struct vmbus_channel_version_response));
|
|
complete(&msginfo->waitevent);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
}
|
|
|
|
/* Channel message dispatch table */
|
|
const struct vmbus_channel_message_table_entry
|
|
channel_message_table[CHANNELMSG_COUNT] = {
|
|
{ CHANNELMSG_INVALID, 0, NULL },
|
|
{ CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer },
|
|
{ CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind },
|
|
{ CHANNELMSG_REQUESTOFFERS, 0, NULL },
|
|
{ CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered },
|
|
{ CHANNELMSG_OPENCHANNEL, 0, NULL },
|
|
{ CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result },
|
|
{ CHANNELMSG_CLOSECHANNEL, 0, NULL },
|
|
{ CHANNELMSG_GPADL_HEADER, 0, NULL },
|
|
{ CHANNELMSG_GPADL_BODY, 0, NULL },
|
|
{ CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created },
|
|
{ CHANNELMSG_GPADL_TEARDOWN, 0, NULL },
|
|
{ CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown },
|
|
{ CHANNELMSG_RELID_RELEASED, 0, NULL },
|
|
{ CHANNELMSG_INITIATE_CONTACT, 0, NULL },
|
|
{ CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response },
|
|
{ CHANNELMSG_UNLOAD, 0, NULL },
|
|
{ CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response },
|
|
{ CHANNELMSG_18, 0, NULL },
|
|
{ CHANNELMSG_19, 0, NULL },
|
|
{ CHANNELMSG_20, 0, NULL },
|
|
{ CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL },
|
|
};
|
|
|
|
/*
|
|
* vmbus_onmessage - Handler for channel protocol messages.
|
|
*
|
|
* This is invoked in the vmbus worker thread context.
|
|
*/
|
|
void vmbus_onmessage(void *context)
|
|
{
|
|
struct hv_message *msg = context;
|
|
struct vmbus_channel_message_header *hdr;
|
|
int size;
|
|
|
|
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
|
|
size = msg->header.payload_size;
|
|
|
|
trace_vmbus_on_message(hdr);
|
|
|
|
if (hdr->msgtype >= CHANNELMSG_COUNT) {
|
|
pr_err("Received invalid channel message type %d size %d\n",
|
|
hdr->msgtype, size);
|
|
print_hex_dump_bytes("", DUMP_PREFIX_NONE,
|
|
(unsigned char *)msg->u.payload, size);
|
|
return;
|
|
}
|
|
|
|
if (channel_message_table[hdr->msgtype].message_handler)
|
|
channel_message_table[hdr->msgtype].message_handler(hdr);
|
|
else
|
|
pr_err("Unhandled channel message type %d\n", hdr->msgtype);
|
|
}
|
|
|
|
/*
|
|
* vmbus_request_offers - Send a request to get all our pending offers.
|
|
*/
|
|
int vmbus_request_offers(void)
|
|
{
|
|
struct vmbus_channel_message_header *msg;
|
|
struct vmbus_channel_msginfo *msginfo;
|
|
int ret;
|
|
|
|
msginfo = kmalloc(sizeof(*msginfo) +
|
|
sizeof(struct vmbus_channel_message_header),
|
|
GFP_KERNEL);
|
|
if (!msginfo)
|
|
return -ENOMEM;
|
|
|
|
msg = (struct vmbus_channel_message_header *)msginfo->msg;
|
|
|
|
msg->msgtype = CHANNELMSG_REQUESTOFFERS;
|
|
|
|
ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header),
|
|
true);
|
|
|
|
trace_vmbus_request_offers(ret);
|
|
|
|
if (ret != 0) {
|
|
pr_err("Unable to request offers - %d\n", ret);
|
|
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
kfree(msginfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the (sub) channel on which to send an outgoing request.
|
|
* When a primary channel has multiple sub-channels, we try to
|
|
* distribute the load equally amongst all available channels.
|
|
*/
|
|
struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary)
|
|
{
|
|
struct list_head *cur, *tmp;
|
|
int cur_cpu;
|
|
struct vmbus_channel *cur_channel;
|
|
struct vmbus_channel *outgoing_channel = primary;
|
|
int next_channel;
|
|
int i = 1;
|
|
|
|
if (list_empty(&primary->sc_list))
|
|
return outgoing_channel;
|
|
|
|
next_channel = primary->next_oc++;
|
|
|
|
if (next_channel > (primary->num_sc)) {
|
|
primary->next_oc = 0;
|
|
return outgoing_channel;
|
|
}
|
|
|
|
cur_cpu = hv_cpu_number_to_vp_number(smp_processor_id());
|
|
list_for_each_safe(cur, tmp, &primary->sc_list) {
|
|
cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
|
|
if (cur_channel->state != CHANNEL_OPENED_STATE)
|
|
continue;
|
|
|
|
if (cur_channel->target_vp == cur_cpu)
|
|
return cur_channel;
|
|
|
|
if (i == next_channel)
|
|
return cur_channel;
|
|
|
|
i++;
|
|
}
|
|
|
|
return outgoing_channel;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel);
|
|
|
|
static void invoke_sc_cb(struct vmbus_channel *primary_channel)
|
|
{
|
|
struct list_head *cur, *tmp;
|
|
struct vmbus_channel *cur_channel;
|
|
|
|
if (primary_channel->sc_creation_callback == NULL)
|
|
return;
|
|
|
|
list_for_each_safe(cur, tmp, &primary_channel->sc_list) {
|
|
cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
|
|
|
|
primary_channel->sc_creation_callback(cur_channel);
|
|
}
|
|
}
|
|
|
|
void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
|
|
void (*sc_cr_cb)(struct vmbus_channel *new_sc))
|
|
{
|
|
primary_channel->sc_creation_callback = sc_cr_cb;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback);
|
|
|
|
bool vmbus_are_subchannels_present(struct vmbus_channel *primary)
|
|
{
|
|
bool ret;
|
|
|
|
ret = !list_empty(&primary->sc_list);
|
|
|
|
if (ret) {
|
|
/*
|
|
* Invoke the callback on sub-channel creation.
|
|
* This will present a uniform interface to the
|
|
* clients.
|
|
*/
|
|
invoke_sc_cb(primary);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present);
|
|
|
|
void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
|
|
void (*chn_rescind_cb)(struct vmbus_channel *))
|
|
{
|
|
channel->chn_rescind_callback = chn_rescind_cb;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback);
|