Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 1 | /* |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 2 | * Copyright (c) 2009, Microsoft Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 16 | * |
| 17 | * Authors: |
| 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
| 19 | * Hank Janssen <hjanssen@microsoft.com> |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 20 | */ |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 22 | |
Greg Kroah-Hartman | a0086dc | 2009-08-17 17:22:08 -0700 | [diff] [blame] | 23 | #include <linux/kernel.h> |
K. Y. Srinivasan | 0c3b7b2 | 2011-02-11 09:59:43 -0800 | [diff] [blame] | 24 | #include <linux/sched.h> |
| 25 | #include <linux/wait.h> |
Greg Kroah-Hartman | a0086dc | 2009-08-17 17:22:08 -0700 | [diff] [blame] | 26 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Bill Pemberton | 53af545 | 2009-09-11 21:46:44 -0400 | [diff] [blame] | 28 | #include <linux/list.h> |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 29 | #include <linux/module.h> |
Haiyang Zhang | 8b5d6d3 | 2010-05-28 23:22:44 +0000 | [diff] [blame] | 30 | #include <linux/completion.h> |
Greg Kroah-Hartman | 46a9719 | 2011-10-04 12:29:52 -0700 | [diff] [blame] | 31 | #include <linux/hyperv.h> |
K. Y. Srinivasan | 3f335ea | 2011-05-12 19:34:15 -0700 | [diff] [blame] | 32 | |
K. Y. Srinivasan | 0f2a661 | 2011-05-12 19:34:28 -0700 | [diff] [blame] | 33 | #include "hyperv_vmbus.h" |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 34 | |
Greg Kroah-Hartman | 1d7e907 | 2009-08-28 16:26:11 -0700 | [diff] [blame] | 35 | struct vmbus_channel_message_table_entry { |
K. Y. Srinivasan | cf9dcba | 2011-05-10 07:55:37 -0700 | [diff] [blame] | 36 | enum vmbus_channel_message_type message_type; |
K. Y. Srinivasan | fa90f1d | 2011-05-10 07:55:36 -0700 | [diff] [blame] | 37 | void (*message_handler)(struct vmbus_channel_message_header *msg); |
Greg Kroah-Hartman | 1d7e907 | 2009-08-28 16:26:11 -0700 | [diff] [blame] | 38 | }; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 39 | |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 40 | |
| 41 | /** |
Greg Kroah-Hartman | da0e963 | 2011-10-11 08:42:28 -0600 | [diff] [blame] | 42 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 43 | * @icmsghdrp: Pointer to msg header structure |
| 44 | * @icmsg_negotiate: Pointer to negotiate message structure |
| 45 | * @buf: Raw buffer channel data |
| 46 | * |
| 47 | * @icmsghdrp is of type &struct icmsg_hdr. |
| 48 | * @negop is of type &struct icmsg_negotiate. |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 49 | * Set up and fill in default negotiate response message. |
| 50 | * |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 51 | * The fw_version specifies the framework version that |
| 52 | * we can support and srv_version specifies the service |
| 53 | * version we can support. |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 54 | * |
| 55 | * Mainly used by Hyper-V drivers. |
| 56 | */ |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 57 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 58 | struct icmsg_negotiate *negop, u8 *buf, |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 59 | int fw_version, int srv_version) |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 60 | { |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 61 | int icframe_major, icframe_minor; |
| 62 | int icmsg_major, icmsg_minor; |
| 63 | int fw_major, fw_minor; |
| 64 | int srv_major, srv_minor; |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 65 | int i; |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 66 | bool found_match = false; |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 67 | |
K. Y. Srinivasan | a360530 | 2012-05-12 13:44:57 -0700 | [diff] [blame] | 68 | icmsghdrp->icmsgsize = 0x10; |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 69 | fw_major = (fw_version >> 16); |
| 70 | fw_minor = (fw_version & 0xFFFF); |
| 71 | |
| 72 | srv_major = (srv_version >> 16); |
| 73 | srv_minor = (srv_version & 0xFFFF); |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 74 | |
K. Y. Srinivasan | a360530 | 2012-05-12 13:44:57 -0700 | [diff] [blame] | 75 | negop = (struct icmsg_negotiate *)&buf[ |
| 76 | sizeof(struct vmbuspipe_hdr) + |
| 77 | sizeof(struct icmsg_hdr)]; |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 78 | |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 79 | icframe_major = negop->icframe_vercnt; |
| 80 | icframe_minor = 0; |
| 81 | |
| 82 | icmsg_major = negop->icmsg_vercnt; |
| 83 | icmsg_minor = 0; |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 84 | |
| 85 | /* |
| 86 | * Select the framework version number we will |
| 87 | * support. |
| 88 | */ |
| 89 | |
| 90 | for (i = 0; i < negop->icframe_vercnt; i++) { |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 91 | if ((negop->icversion_data[i].major == fw_major) && |
| 92 | (negop->icversion_data[i].minor == fw_minor)) { |
| 93 | icframe_major = negop->icversion_data[i].major; |
| 94 | icframe_minor = negop->icversion_data[i].minor; |
| 95 | found_match = true; |
| 96 | } |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 97 | } |
K. Y. Srinivasan | a360530 | 2012-05-12 13:44:57 -0700 | [diff] [blame] | 98 | |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 99 | if (!found_match) |
| 100 | goto fw_error; |
| 101 | |
| 102 | found_match = false; |
| 103 | |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 104 | for (i = negop->icframe_vercnt; |
| 105 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 106 | if ((negop->icversion_data[i].major == srv_major) && |
| 107 | (negop->icversion_data[i].minor == srv_minor)) { |
| 108 | icmsg_major = negop->icversion_data[i].major; |
| 109 | icmsg_minor = negop->icversion_data[i].minor; |
| 110 | found_match = true; |
| 111 | } |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | /* |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 115 | * Respond with the framework and service |
K. Y. Srinivasan | c836d0a | 2012-05-12 13:44:58 -0700 | [diff] [blame] | 116 | * version numbers we can support. |
| 117 | */ |
K. Y. Srinivasan | 6741335 | 2013-07-02 10:31:30 -0700 | [diff] [blame] | 118 | |
| 119 | fw_error: |
| 120 | if (!found_match) { |
| 121 | negop->icframe_vercnt = 0; |
| 122 | negop->icmsg_vercnt = 0; |
| 123 | } else { |
| 124 | negop->icframe_vercnt = 1; |
| 125 | negop->icmsg_vercnt = 1; |
| 126 | } |
| 127 | |
| 128 | negop->icversion_data[0].major = icframe_major; |
| 129 | negop->icversion_data[0].minor = icframe_minor; |
| 130 | negop->icversion_data[1].major = icmsg_major; |
| 131 | negop->icversion_data[1].minor = icmsg_minor; |
| 132 | return found_match; |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 133 | } |
K. Y. Srinivasan | a360530 | 2012-05-12 13:44:57 -0700 | [diff] [blame] | 134 | |
Greg Kroah-Hartman | da0e963 | 2011-10-11 08:42:28 -0600 | [diff] [blame] | 135 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 136 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 137 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 138 | * alloc_channel - Allocate and initialize a vmbus channel object |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 139 | */ |
Greg Kroah-Hartman | 50fe56d | 2010-10-20 15:51:57 -0700 | [diff] [blame] | 140 | static struct vmbus_channel *alloc_channel(void) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 141 | { |
Vitaly Kuznetsov | bc63b6f | 2015-02-27 11:25:52 -0800 | [diff] [blame] | 142 | static atomic_t chan_num = ATOMIC_INIT(0); |
Greg Kroah-Hartman | aded716 | 2009-08-18 15:21:19 -0700 | [diff] [blame] | 143 | struct vmbus_channel *channel; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 144 | |
Greg Kroah-Hartman | aded716 | 2009-08-18 15:21:19 -0700 | [diff] [blame] | 145 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 146 | if (!channel) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 147 | return NULL; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 148 | |
Vitaly Kuznetsov | bc63b6f | 2015-02-27 11:25:52 -0800 | [diff] [blame] | 149 | channel->id = atomic_inc_return(&chan_num); |
Greg Kroah-Hartman | 54411c4 | 2009-07-15 14:48:32 -0700 | [diff] [blame] | 150 | spin_lock_init(&channel->inbound_lock); |
Vitaly Kuznetsov | 67fae05 | 2015-01-20 16:45:05 +0100 | [diff] [blame] | 151 | spin_lock_init(&channel->lock); |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 152 | |
| 153 | INIT_LIST_HEAD(&channel->sc_list); |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 154 | INIT_LIST_HEAD(&channel->percpu_list); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 155 | |
Vitaly Kuznetsov | bc63b6f | 2015-02-27 11:25:52 -0800 | [diff] [blame] | 156 | channel->controlwq = alloc_workqueue("hv_vmbus_ctl/%d", WQ_MEM_RECLAIM, |
| 157 | 1, channel->id); |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 158 | if (!channel->controlwq) { |
Greg Kroah-Hartman | 8c69f52 | 2009-07-15 12:48:29 -0700 | [diff] [blame] | 159 | kfree(channel); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 160 | return NULL; |
| 161 | } |
| 162 | |
| 163 | return channel; |
| 164 | } |
| 165 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 166 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 167 | * release_hannel - Release the vmbus channel object itself |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 168 | */ |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 169 | static void release_channel(struct work_struct *work) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 170 | { |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 171 | struct vmbus_channel *channel = container_of(work, |
| 172 | struct vmbus_channel, |
| 173 | work); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 174 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 175 | destroy_workqueue(channel->controlwq); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 176 | |
Greg Kroah-Hartman | 8c69f52 | 2009-07-15 12:48:29 -0700 | [diff] [blame] | 177 | kfree(channel); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 180 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 181 | * free_channel - Release the resources used by the vmbus channel object |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 182 | */ |
Greg Kroah-Hartman | 9f3e28e | 2011-10-11 09:40:01 -0600 | [diff] [blame] | 183 | static void free_channel(struct vmbus_channel *channel) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 184 | { |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 185 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 186 | /* |
| 187 | * We have to release the channel's workqueue/thread in the vmbus's |
| 188 | * workqueue/thread context |
| 189 | * ie we can't destroy ourselves. |
| 190 | */ |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 191 | INIT_WORK(&channel->work, release_channel); |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 192 | queue_work(vmbus_connection.work_queue, &channel->work); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 193 | } |
| 194 | |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 195 | static void percpu_channel_enq(void *arg) |
| 196 | { |
| 197 | struct vmbus_channel *channel = arg; |
| 198 | int cpu = smp_processor_id(); |
Haiyang Zhang | 8b5d6d3 | 2010-05-28 23:22:44 +0000 | [diff] [blame] | 199 | |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 200 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); |
| 201 | } |
| 202 | |
| 203 | static void percpu_channel_deq(void *arg) |
| 204 | { |
| 205 | struct vmbus_channel *channel = arg; |
| 206 | |
| 207 | list_del(&channel->percpu_list); |
| 208 | } |
Haiyang Zhang | 8b5d6d3 | 2010-05-28 23:22:44 +0000 | [diff] [blame] | 209 | |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 210 | /* |
| 211 | * vmbus_process_rescind_offer - |
| 212 | * Rescind the offer by initiating a device removal |
| 213 | */ |
| 214 | static void vmbus_process_rescind_offer(struct work_struct *work) |
| 215 | { |
| 216 | struct vmbus_channel *channel = container_of(work, |
| 217 | struct vmbus_channel, |
| 218 | work); |
K. Y. Srinivasan | c870597 | 2013-03-15 12:25:44 -0700 | [diff] [blame] | 219 | unsigned long flags; |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 220 | struct vmbus_channel *primary_channel; |
K. Y. Srinivasan | c870597 | 2013-03-15 12:25:44 -0700 | [diff] [blame] | 221 | struct vmbus_channel_relid_released msg; |
Vitaly Kuznetsov | 04a258c | 2014-11-04 13:40:11 +0100 | [diff] [blame] | 222 | struct device *dev; |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 223 | |
Vitaly Kuznetsov | 04a258c | 2014-11-04 13:40:11 +0100 | [diff] [blame] | 224 | if (channel->device_obj) { |
| 225 | dev = get_device(&channel->device_obj->device); |
| 226 | if (dev) { |
| 227 | vmbus_device_unregister(channel->device_obj); |
| 228 | put_device(dev); |
| 229 | } |
| 230 | } |
| 231 | |
K. Y. Srinivasan | c870597 | 2013-03-15 12:25:44 -0700 | [diff] [blame] | 232 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
| 233 | msg.child_relid = channel->offermsg.child_relid; |
| 234 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
| 235 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); |
| 236 | |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 237 | if (channel->target_cpu != get_cpu()) { |
| 238 | put_cpu(); |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 239 | smp_call_function_single(channel->target_cpu, |
| 240 | percpu_channel_deq, channel, true); |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 241 | } else { |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 242 | percpu_channel_deq(channel); |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 243 | put_cpu(); |
| 244 | } |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 245 | |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 246 | if (channel->primary_channel == NULL) { |
| 247 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
| 248 | list_del(&channel->listentry); |
| 249 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
| 250 | } else { |
| 251 | primary_channel = channel->primary_channel; |
Vitaly Kuznetsov | 67fae05 | 2015-01-20 16:45:05 +0100 | [diff] [blame] | 252 | spin_lock_irqsave(&primary_channel->lock, flags); |
K. Y. Srinivasan | 565ce64 | 2013-10-16 19:27:19 -0700 | [diff] [blame] | 253 | list_del(&channel->sc_list); |
Vitaly Kuznetsov | 67fae05 | 2015-01-20 16:45:05 +0100 | [diff] [blame] | 254 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 255 | } |
K. Y. Srinivasan | c870597 | 2013-03-15 12:25:44 -0700 | [diff] [blame] | 256 | free_channel(channel); |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 257 | } |
Haiyang Zhang | 8b5d6d3 | 2010-05-28 23:22:44 +0000 | [diff] [blame] | 258 | |
K. Y. Srinivasan | 93e5bd0 | 2011-12-12 09:29:17 -0800 | [diff] [blame] | 259 | void vmbus_free_channels(void) |
| 260 | { |
| 261 | struct vmbus_channel *channel; |
| 262 | |
| 263 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
| 264 | vmbus_device_unregister(channel->device_obj); |
K. Y. Srinivasan | 93e5bd0 | 2011-12-12 09:29:17 -0800 | [diff] [blame] | 265 | free_channel(channel); |
| 266 | } |
| 267 | } |
| 268 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 269 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 270 | * vmbus_process_offer - Process the offer by creating a channel/device |
Hank Janssen | c88c4e4 | 2010-05-04 15:55:05 -0700 | [diff] [blame] | 271 | * associated with this offer |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 272 | */ |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 273 | static void vmbus_process_offer(struct work_struct *work) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 274 | { |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 275 | struct vmbus_channel *newchannel = container_of(work, |
| 276 | struct vmbus_channel, |
| 277 | work); |
Greg Kroah-Hartman | aded716 | 2009-08-18 15:21:19 -0700 | [diff] [blame] | 278 | struct vmbus_channel *channel; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 279 | bool fnew = true; |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 280 | bool enq = false; |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 281 | int ret; |
Greg Kroah-Hartman | 0f5e44c | 2009-07-15 14:57:16 -0700 | [diff] [blame] | 282 | unsigned long flags; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 283 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 284 | /* Make sure this is a new offer */ |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 285 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 286 | |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 287 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
K. Y. Srinivasan | 358d2ee | 2011-08-25 09:48:28 -0700 | [diff] [blame] | 288 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
| 289 | newchannel->offermsg.offer.if_type) && |
| 290 | !uuid_le_cmp(channel->offermsg.offer.if_instance, |
| 291 | newchannel->offermsg.offer.if_instance)) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 292 | fnew = false; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 293 | break; |
| 294 | } |
| 295 | } |
| 296 | |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 297 | if (fnew) { |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 298 | list_add_tail(&newchannel->listentry, |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 299 | &vmbus_connection.chn_list); |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 300 | enq = true; |
| 301 | } |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 302 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 303 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 304 | |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 305 | if (enq) { |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 306 | if (newchannel->target_cpu != get_cpu()) { |
| 307 | put_cpu(); |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 308 | smp_call_function_single(newchannel->target_cpu, |
| 309 | percpu_channel_enq, |
| 310 | newchannel, true); |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 311 | } else { |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 312 | percpu_channel_enq(newchannel); |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 313 | put_cpu(); |
| 314 | } |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 315 | } |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 316 | if (!fnew) { |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 317 | /* |
| 318 | * Check to see if this is a sub-channel. |
| 319 | */ |
| 320 | if (newchannel->offermsg.offer.sub_channel_index != 0) { |
| 321 | /* |
| 322 | * Process the sub-channel. |
| 323 | */ |
| 324 | newchannel->primary_channel = channel; |
Vitaly Kuznetsov | 67fae05 | 2015-01-20 16:45:05 +0100 | [diff] [blame] | 325 | spin_lock_irqsave(&channel->lock, flags); |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 326 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
Vitaly Kuznetsov | 67fae05 | 2015-01-20 16:45:05 +0100 | [diff] [blame] | 327 | spin_unlock_irqrestore(&channel->lock, flags); |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 328 | |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 329 | if (newchannel->target_cpu != get_cpu()) { |
| 330 | put_cpu(); |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 331 | smp_call_function_single(newchannel->target_cpu, |
| 332 | percpu_channel_enq, |
| 333 | newchannel, true); |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 334 | } else { |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 335 | percpu_channel_enq(newchannel); |
K. Y. Srinivasan | 2115b56 | 2014-08-28 18:29:53 -0700 | [diff] [blame] | 336 | put_cpu(); |
| 337 | } |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 338 | |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 339 | newchannel->state = CHANNEL_OPEN_STATE; |
| 340 | if (channel->sc_creation_callback != NULL) |
| 341 | channel->sc_creation_callback(newchannel); |
| 342 | |
Vitaly Kuznetsov | d7f2fba | 2015-01-20 16:45:06 +0100 | [diff] [blame] | 343 | goto done_init_rescind; |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 344 | } |
| 345 | |
Vitaly Kuznetsov | 9c3a6f7 | 2015-01-20 16:45:04 +0100 | [diff] [blame] | 346 | goto err_free_chan; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 347 | } |
| 348 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 349 | /* |
K. Y. Srinivasan | 42dceeb | 2013-08-26 14:08:58 -0700 | [diff] [blame] | 350 | * This state is used to indicate a successful open |
| 351 | * so that when we do close the channel normally, we |
| 352 | * can cleanup properly |
| 353 | */ |
| 354 | newchannel->state = CHANNEL_OPEN_STATE; |
| 355 | |
| 356 | /* |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 357 | * Start the process of binding this offer to the driver |
| 358 | * We need to set the DeviceObject field before calling |
Haiyang Zhang | 646f1ea | 2011-01-26 12:12:10 -0800 | [diff] [blame] | 359 | * vmbus_child_dev_add() |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 360 | */ |
K. Y. Srinivasan | f2c7301 | 2011-09-08 07:24:12 -0700 | [diff] [blame] | 361 | newchannel->device_obj = vmbus_device_create( |
Haiyang Zhang | 767dff6 | 2011-01-26 12:12:12 -0800 | [diff] [blame] | 362 | &newchannel->offermsg.offer.if_type, |
| 363 | &newchannel->offermsg.offer.if_instance, |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 364 | newchannel); |
Vitaly Kuznetsov | 9c3a6f7 | 2015-01-20 16:45:04 +0100 | [diff] [blame] | 365 | if (!newchannel->device_obj) |
| 366 | goto err_free_chan; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 367 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 368 | /* |
| 369 | * Add the new device to the bus. This will kick off device-driver |
| 370 | * binding which eventually invokes the device driver's AddDevice() |
| 371 | * method. |
| 372 | */ |
K. Y. Srinivasan | 22794281 | 2011-09-08 07:24:13 -0700 | [diff] [blame] | 373 | ret = vmbus_device_register(newchannel->device_obj); |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 374 | if (ret != 0) { |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 375 | pr_err("unable to add child device object (relid %d)\n", |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 376 | newchannel->offermsg.child_relid); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 377 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 378 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 379 | list_del(&newchannel->listentry); |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 380 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
K. Y. Srinivasan | 8b8ee67 | 2011-12-12 09:29:16 -0800 | [diff] [blame] | 381 | kfree(newchannel->device_obj); |
Vitaly Kuznetsov | 9c3a6f7 | 2015-01-20 16:45:04 +0100 | [diff] [blame] | 382 | goto err_free_chan; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 383 | } |
Vitaly Kuznetsov | d7f2fba | 2015-01-20 16:45:06 +0100 | [diff] [blame] | 384 | done_init_rescind: |
| 385 | spin_lock_irqsave(&newchannel->lock, flags); |
| 386 | /* The next possible work is rescind handling */ |
| 387 | INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); |
| 388 | /* Check if rescind offer was already received */ |
| 389 | if (newchannel->rescind) |
| 390 | queue_work(newchannel->controlwq, &newchannel->work); |
| 391 | spin_unlock_irqrestore(&newchannel->lock, flags); |
Vitaly Kuznetsov | 9c3a6f7 | 2015-01-20 16:45:04 +0100 | [diff] [blame] | 392 | return; |
| 393 | err_free_chan: |
| 394 | free_channel(newchannel); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 395 | } |
| 396 | |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 397 | enum { |
| 398 | IDE = 0, |
| 399 | SCSI, |
| 400 | NIC, |
| 401 | MAX_PERF_CHN, |
| 402 | }; |
| 403 | |
| 404 | /* |
K. Y. Srinivasan | 7fb9656 | 2013-01-23 17:42:40 -0800 | [diff] [blame] | 405 | * This is an array of device_ids (device types) that are performance critical. |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 406 | * We attempt to distribute the interrupt load for these devices across |
| 407 | * all available CPUs. |
| 408 | */ |
K. Y. Srinivasan | 7fb9656 | 2013-01-23 17:42:40 -0800 | [diff] [blame] | 409 | static const struct hv_vmbus_device_id hp_devs[] = { |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 410 | /* IDE */ |
K. Y. Srinivasan | 7fb9656 | 2013-01-23 17:42:40 -0800 | [diff] [blame] | 411 | { HV_IDE_GUID, }, |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 412 | /* Storage - SCSI */ |
K. Y. Srinivasan | 7fb9656 | 2013-01-23 17:42:40 -0800 | [diff] [blame] | 413 | { HV_SCSI_GUID, }, |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 414 | /* Network */ |
K. Y. Srinivasan | 7fb9656 | 2013-01-23 17:42:40 -0800 | [diff] [blame] | 415 | { HV_NIC_GUID, }, |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 416 | }; |
| 417 | |
| 418 | |
| 419 | /* |
| 420 | * We use this state to statically distribute the channel interrupt load. |
| 421 | */ |
| 422 | static u32 next_vp; |
| 423 | |
| 424 | /* |
| 425 | * Starting with Win8, we can statically distribute the incoming |
| 426 | * channel interrupt load by binding a channel to VCPU. We |
| 427 | * implement here a simple round robin scheme for distributing |
| 428 | * the interrupt load. |
| 429 | * We will bind channels that are not performance critical to cpu 0 and |
| 430 | * performance critical channels (IDE, SCSI and Network) will be uniformly |
| 431 | * distributed across all available CPUs. |
| 432 | */ |
Linus Torvalds | f9da455 | 2014-06-12 14:27:40 -0700 | [diff] [blame] | 433 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 434 | { |
| 435 | u32 cur_cpu; |
| 436 | int i; |
| 437 | bool perf_chn = false; |
| 438 | u32 max_cpus = num_online_cpus(); |
| 439 | |
| 440 | for (i = IDE; i < MAX_PERF_CHN; i++) { |
K. Y. Srinivasan | 7fb9656 | 2013-01-23 17:42:40 -0800 | [diff] [blame] | 441 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 442 | sizeof(uuid_le))) { |
| 443 | perf_chn = true; |
| 444 | break; |
| 445 | } |
| 446 | } |
| 447 | if ((vmbus_proto_version == VERSION_WS2008) || |
| 448 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { |
| 449 | /* |
| 450 | * Prior to win8, all channel interrupts are |
| 451 | * delivered on cpu 0. |
| 452 | * Also if the channel is not a performance critical |
| 453 | * channel, bind it to cpu 0. |
| 454 | */ |
K. Y. Srinivasan | d3ba720 | 2014-04-08 18:45:53 -0700 | [diff] [blame] | 455 | channel->target_cpu = 0; |
| 456 | channel->target_vp = 0; |
| 457 | return; |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 458 | } |
| 459 | cur_cpu = (++next_vp % max_cpus); |
K. Y. Srinivasan | d3ba720 | 2014-04-08 18:45:53 -0700 | [diff] [blame] | 460 | channel->target_cpu = cur_cpu; |
| 461 | channel->target_vp = hv_context.vp_index[cur_cpu]; |
K. Y. Srinivasan | a119845 | 2012-12-01 06:46:50 -0800 | [diff] [blame] | 462 | } |
| 463 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 464 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 465 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 466 | * |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 467 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 468 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 469 | { |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 470 | struct vmbus_channel_offer_channel *offer; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 471 | struct vmbus_channel *newchannel; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 472 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 473 | offer = (struct vmbus_channel_offer_channel *)hdr; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 474 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 475 | /* Allocate the channel object and save this offer. */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 476 | newchannel = alloc_channel(); |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 477 | if (!newchannel) { |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 478 | pr_err("Unable to allocate channel object\n"); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 479 | return; |
| 480 | } |
| 481 | |
K. Y. Srinivasan | 132368b | 2012-12-01 06:46:33 -0800 | [diff] [blame] | 482 | /* |
| 483 | * By default we setup state to enable batched |
| 484 | * reading. A specific service can choose to |
| 485 | * disable this prior to opening the channel. |
| 486 | */ |
| 487 | newchannel->batched_reading = true; |
| 488 | |
K. Y. Srinivasan | b3bf60c | 2012-12-01 06:46:45 -0800 | [diff] [blame] | 489 | /* |
| 490 | * Setup state for signalling the host. |
| 491 | */ |
| 492 | newchannel->sig_event = (struct hv_input_signal_event *) |
| 493 | (ALIGN((unsigned long) |
| 494 | &newchannel->sig_buf, |
| 495 | HV_HYPERCALL_PARAM_ALIGN)); |
| 496 | |
| 497 | newchannel->sig_event->connectionid.asu32 = 0; |
| 498 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; |
| 499 | newchannel->sig_event->flag_number = 0; |
| 500 | newchannel->sig_event->rsvdz = 0; |
| 501 | |
| 502 | if (vmbus_proto_version != VERSION_WS2008) { |
| 503 | newchannel->is_dedicated_interrupt = |
| 504 | (offer->is_dedicated_interrupt != 0); |
| 505 | newchannel->sig_event->connectionid.u.id = |
| 506 | offer->connection_id; |
| 507 | } |
| 508 | |
K. Y. Srinivasan | d3ba720 | 2014-04-08 18:45:53 -0700 | [diff] [blame] | 509 | init_vp_index(newchannel, &offer->offer.if_type); |
K. Y. Srinivasan | abbf3b2 | 2012-12-01 06:46:48 -0800 | [diff] [blame] | 510 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 511 | memcpy(&newchannel->offermsg, offer, |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 512 | sizeof(struct vmbus_channel_offer_channel)); |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 513 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
| 514 | newchannel->monitor_bit = (u8)offer->monitorid % 32; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 515 | |
Timo Teräs | 4b2f9ab | 2010-12-15 20:48:09 +0200 | [diff] [blame] | 516 | INIT_WORK(&newchannel->work, vmbus_process_offer); |
| 517 | queue_work(newchannel->controlwq, &newchannel->work); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 518 | } |
| 519 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 520 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 521 | * vmbus_onoffer_rescind - Rescind offer handler. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 522 | * |
| 523 | * We queue a work item to process this offer synchronously |
| 524 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 525 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 526 | { |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 527 | struct vmbus_channel_rescind_offer *rescind; |
Greg Kroah-Hartman | aded716 | 2009-08-18 15:21:19 -0700 | [diff] [blame] | 528 | struct vmbus_channel *channel; |
Vitaly Kuznetsov | d7f2fba | 2015-01-20 16:45:06 +0100 | [diff] [blame] | 529 | unsigned long flags; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 530 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 531 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 532 | channel = relid2channel(rescind->child_relid); |
Hank Janssen | 98e0870 | 2011-03-29 13:58:44 -0700 | [diff] [blame] | 533 | |
| 534 | if (channel == NULL) |
| 535 | /* Just return here, no channel found */ |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 536 | return; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 537 | |
Vitaly Kuznetsov | d7f2fba | 2015-01-20 16:45:06 +0100 | [diff] [blame] | 538 | spin_lock_irqsave(&channel->lock, flags); |
Haiyang Zhang | c3582a2 | 2014-12-01 13:28:39 -0800 | [diff] [blame] | 539 | channel->rescind = true; |
Vitaly Kuznetsov | d7f2fba | 2015-01-20 16:45:06 +0100 | [diff] [blame] | 540 | /* |
| 541 | * channel->work.func != vmbus_process_rescind_offer means we are still |
| 542 | * processing offer request and the rescind offer processing should be |
| 543 | * postponed. It will be done at the very end of vmbus_process_offer() |
| 544 | * as rescind flag is being checked there. |
| 545 | */ |
| 546 | if (channel->work.func == vmbus_process_rescind_offer) |
| 547 | /* work is initialized for vmbus_process_rescind_offer() from |
| 548 | * vmbus_process_offer() where the channel got created */ |
| 549 | queue_work(channel->controlwq, &channel->work); |
Haiyang Zhang | c3582a2 | 2014-12-01 13:28:39 -0800 | [diff] [blame] | 550 | |
Vitaly Kuznetsov | d7f2fba | 2015-01-20 16:45:06 +0100 | [diff] [blame] | 551 | spin_unlock_irqrestore(&channel->lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 552 | } |
| 553 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 554 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 555 | * vmbus_onoffers_delivered - |
| 556 | * This is invoked when all offers have been delivered. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 557 | * |
| 558 | * Nothing to do here. |
| 559 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 560 | static void vmbus_onoffers_delivered( |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 561 | struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 562 | { |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 563 | } |
| 564 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 565 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 566 | * vmbus_onopen_result - Open result handler. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 567 | * |
| 568 | * This is invoked when we received a response to our channel open request. |
| 569 | * Find the matching request, copy the response and signal the requesting |
| 570 | * thread. |
| 571 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 572 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 573 | { |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 574 | struct vmbus_channel_open_result *result; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 575 | struct vmbus_channel_msginfo *msginfo; |
| 576 | struct vmbus_channel_message_header *requestheader; |
| 577 | struct vmbus_channel_open_channel *openmsg; |
Greg Kroah-Hartman | dd0813b | 2009-07-15 14:56:45 -0700 | [diff] [blame] | 578 | unsigned long flags; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 579 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 580 | result = (struct vmbus_channel_open_result *)hdr; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 581 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 582 | /* |
| 583 | * Find the open msg, copy the result and signal/unblock the wait event |
| 584 | */ |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 585 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 586 | |
Hank Janssen | ebb61e5 | 2011-02-18 12:39:57 -0800 | [diff] [blame] | 587 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
| 588 | msglistentry) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 589 | requestheader = |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 590 | (struct vmbus_channel_message_header *)msginfo->msg; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 591 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 592 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 593 | openmsg = |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 594 | (struct vmbus_channel_open_channel *)msginfo->msg; |
| 595 | if (openmsg->child_relid == result->child_relid && |
| 596 | openmsg->openid == result->openid) { |
| 597 | memcpy(&msginfo->response.open_result, |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 598 | result, |
K. Y. Srinivasan | 9568a19 | 2011-05-10 07:55:39 -0700 | [diff] [blame] | 599 | sizeof( |
| 600 | struct vmbus_channel_open_result)); |
| 601 | complete(&msginfo->waitevent); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 602 | break; |
| 603 | } |
| 604 | } |
| 605 | } |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 606 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 607 | } |
| 608 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 609 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 610 | * vmbus_ongpadl_created - GPADL created handler. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 611 | * |
| 612 | * This is invoked when we received a response to our gpadl create request. |
| 613 | * Find the matching request, copy the response and signal the requesting |
| 614 | * thread. |
| 615 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 616 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 617 | { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 618 | struct vmbus_channel_gpadl_created *gpadlcreated; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 619 | struct vmbus_channel_msginfo *msginfo; |
| 620 | struct vmbus_channel_message_header *requestheader; |
| 621 | struct vmbus_channel_gpadl_header *gpadlheader; |
Greg Kroah-Hartman | dd0813b | 2009-07-15 14:56:45 -0700 | [diff] [blame] | 622 | unsigned long flags; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 623 | |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 624 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 625 | |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 626 | /* |
| 627 | * Find the establish msg, copy the result and signal/unblock the wait |
| 628 | * event |
| 629 | */ |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 630 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 631 | |
Hank Janssen | ebb61e5 | 2011-02-18 12:39:57 -0800 | [diff] [blame] | 632 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
| 633 | msglistentry) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 634 | requestheader = |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 635 | (struct vmbus_channel_message_header *)msginfo->msg; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 636 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 637 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 638 | gpadlheader = |
| 639 | (struct vmbus_channel_gpadl_header *)requestheader; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 640 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 641 | if ((gpadlcreated->child_relid == |
| 642 | gpadlheader->child_relid) && |
| 643 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { |
| 644 | memcpy(&msginfo->response.gpadl_created, |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 645 | gpadlcreated, |
K. Y. Srinivasan | 9568a19 | 2011-05-10 07:55:39 -0700 | [diff] [blame] | 646 | sizeof( |
| 647 | struct vmbus_channel_gpadl_created)); |
| 648 | complete(&msginfo->waitevent); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 649 | break; |
| 650 | } |
| 651 | } |
| 652 | } |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 653 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 654 | } |
| 655 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 656 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 657 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 658 | * |
| 659 | * This is invoked when we received a response to our gpadl teardown request. |
| 660 | * Find the matching request, copy the response and signal the requesting |
| 661 | * thread. |
| 662 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 663 | static void vmbus_ongpadl_torndown( |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 664 | struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 665 | { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 666 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 667 | struct vmbus_channel_msginfo *msginfo; |
| 668 | struct vmbus_channel_message_header *requestheader; |
| 669 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; |
Greg Kroah-Hartman | dd0813b | 2009-07-15 14:56:45 -0700 | [diff] [blame] | 670 | unsigned long flags; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 671 | |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 672 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 673 | |
| 674 | /* |
| 675 | * Find the open msg, copy the result and signal/unblock the wait event |
| 676 | */ |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 677 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 678 | |
Hank Janssen | ebb61e5 | 2011-02-18 12:39:57 -0800 | [diff] [blame] | 679 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
| 680 | msglistentry) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 681 | requestheader = |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 682 | (struct vmbus_channel_message_header *)msginfo->msg; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 683 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 684 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 685 | gpadl_teardown = |
| 686 | (struct vmbus_channel_gpadl_teardown *)requestheader; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 687 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 688 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
| 689 | memcpy(&msginfo->response.gpadl_torndown, |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 690 | gpadl_torndown, |
K. Y. Srinivasan | 9568a19 | 2011-05-10 07:55:39 -0700 | [diff] [blame] | 691 | sizeof( |
| 692 | struct vmbus_channel_gpadl_torndown)); |
| 693 | complete(&msginfo->waitevent); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 694 | break; |
| 695 | } |
| 696 | } |
| 697 | } |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 698 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 699 | } |
| 700 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 701 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 702 | * vmbus_onversion_response - Version response handler |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 703 | * |
| 704 | * This is invoked when we received a response to our initiate contact request. |
| 705 | * Find the matching request, copy the response and signal the requesting |
| 706 | * thread. |
| 707 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 708 | static void vmbus_onversion_response( |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 709 | struct vmbus_channel_message_header *hdr) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 710 | { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 711 | struct vmbus_channel_msginfo *msginfo; |
| 712 | struct vmbus_channel_message_header *requestheader; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 713 | struct vmbus_channel_version_response *version_response; |
Greg Kroah-Hartman | dd0813b | 2009-07-15 14:56:45 -0700 | [diff] [blame] | 714 | unsigned long flags; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 715 | |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 716 | version_response = (struct vmbus_channel_version_response *)hdr; |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 717 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 718 | |
Hank Janssen | ebb61e5 | 2011-02-18 12:39:57 -0800 | [diff] [blame] | 719 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
| 720 | msglistentry) { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 721 | requestheader = |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 722 | (struct vmbus_channel_message_header *)msginfo->msg; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 723 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 724 | if (requestheader->msgtype == |
| 725 | CHANNELMSG_INITIATE_CONTACT) { |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 726 | memcpy(&msginfo->response.version_response, |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 727 | version_response, |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 728 | sizeof(struct vmbus_channel_version_response)); |
K. Y. Srinivasan | 9568a19 | 2011-05-10 07:55:39 -0700 | [diff] [blame] | 729 | complete(&msginfo->waitevent); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 730 | } |
| 731 | } |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 732 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Greg Kroah-Hartman | c8212f0 | 2009-08-31 21:51:50 -0700 | [diff] [blame] | 735 | /* Channel message dispatch table */ |
| 736 | static struct vmbus_channel_message_table_entry |
K. Y. Srinivasan | b7c6b02 | 2011-05-10 07:55:38 -0700 | [diff] [blame] | 737 | channel_message_table[CHANNELMSG_COUNT] = { |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 738 | {CHANNELMSG_INVALID, NULL}, |
| 739 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, |
| 740 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, |
| 741 | {CHANNELMSG_REQUESTOFFERS, NULL}, |
| 742 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, |
| 743 | {CHANNELMSG_OPENCHANNEL, NULL}, |
| 744 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, |
| 745 | {CHANNELMSG_CLOSECHANNEL, NULL}, |
| 746 | {CHANNELMSG_GPADL_HEADER, NULL}, |
| 747 | {CHANNELMSG_GPADL_BODY, NULL}, |
| 748 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, |
| 749 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, |
| 750 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, |
| 751 | {CHANNELMSG_RELID_RELEASED, NULL}, |
| 752 | {CHANNELMSG_INITIATE_CONTACT, NULL}, |
| 753 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, |
| 754 | {CHANNELMSG_UNLOAD, NULL}, |
Greg Kroah-Hartman | c8212f0 | 2009-08-31 21:51:50 -0700 | [diff] [blame] | 755 | }; |
| 756 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 757 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 758 | * vmbus_onmessage - Handler for channel protocol messages. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 759 | * |
| 760 | * This is invoked in the vmbus worker thread context. |
| 761 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 762 | void vmbus_onmessage(void *context) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 763 | { |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 764 | struct hv_message *msg = context; |
Greg Kroah-Hartman | 8225021 | 2009-08-26 15:16:04 -0700 | [diff] [blame] | 765 | struct vmbus_channel_message_header *hdr; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 766 | int size; |
| 767 | |
Haiyang Zhang | f6feebe | 2010-11-08 14:04:39 -0800 | [diff] [blame] | 768 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
| 769 | size = msg->header.payload_size; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 770 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 771 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 772 | pr_err("Received invalid channel message type %d size %d\n", |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 773 | hdr->msgtype, size); |
Greg Kroah-Hartman | 04f50c4 | 2009-07-16 12:35:37 -0700 | [diff] [blame] | 774 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
Haiyang Zhang | f6feebe | 2010-11-08 14:04:39 -0800 | [diff] [blame] | 775 | (unsigned char *)msg->u.payload, size); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 776 | return; |
| 777 | } |
| 778 | |
K. Y. Srinivasan | b7c6b02 | 2011-05-10 07:55:38 -0700 | [diff] [blame] | 779 | if (channel_message_table[hdr->msgtype].message_handler) |
| 780 | channel_message_table[hdr->msgtype].message_handler(hdr); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 781 | else |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 782 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 783 | } |
| 784 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 785 | /* |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 786 | * vmbus_request_offers - Send a request to get all our pending offers. |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 787 | */ |
Haiyang Zhang | e98cb27 | 2010-10-15 10:14:07 -0700 | [diff] [blame] | 788 | int vmbus_request_offers(void) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 789 | { |
Greg Kroah-Hartman | 8225021 | 2009-08-26 15:16:04 -0700 | [diff] [blame] | 790 | struct vmbus_channel_message_header *msg; |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 791 | struct vmbus_channel_msginfo *msginfo; |
Nicholas Mc Guire | 51e5181 | 2015-02-27 11:26:02 -0800 | [diff] [blame^] | 792 | int ret; |
| 793 | unsigned long t; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 794 | |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 795 | msginfo = kmalloc(sizeof(*msginfo) + |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 796 | sizeof(struct vmbus_channel_message_header), |
| 797 | GFP_KERNEL); |
Haiyang Zhang | 188963e | 2010-10-15 10:14:06 -0700 | [diff] [blame] | 798 | if (!msginfo) |
Bill Pemberton | 75910f2 | 2010-05-05 15:27:31 -0400 | [diff] [blame] | 799 | return -ENOMEM; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 800 | |
K. Y. Srinivasan | 9568a19 | 2011-05-10 07:55:39 -0700 | [diff] [blame] | 801 | init_completion(&msginfo->waitevent); |
Bill Pemberton | 75910f2 | 2010-05-05 15:27:31 -0400 | [diff] [blame] | 802 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 803 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 804 | |
Haiyang Zhang | c50f7fb | 2010-11-08 14:04:38 -0800 | [diff] [blame] | 805 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 806 | |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 807 | |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 808 | ret = vmbus_post_msg(msg, |
Greg Kroah-Hartman | bd60c33 | 2009-08-31 21:47:21 -0700 | [diff] [blame] | 809 | sizeof(struct vmbus_channel_message_header)); |
| 810 | if (ret != 0) { |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 811 | pr_err("Unable to request offers - %d\n", ret); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 812 | |
K. Y. Srinivasan | 0c3b7b2 | 2011-02-11 09:59:43 -0800 | [diff] [blame] | 813 | goto cleanup; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 814 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 815 | |
K. Y. Srinivasan | 2dfde96 | 2011-06-16 13:16:34 -0700 | [diff] [blame] | 816 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
K. Y. Srinivasan | 9568a19 | 2011-05-10 07:55:39 -0700 | [diff] [blame] | 817 | if (t == 0) { |
K. Y. Srinivasan | 0c3b7b2 | 2011-02-11 09:59:43 -0800 | [diff] [blame] | 818 | ret = -ETIMEDOUT; |
| 819 | goto cleanup; |
| 820 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 821 | |
| 822 | |
K. Y. Srinivasan | 0c3b7b2 | 2011-02-11 09:59:43 -0800 | [diff] [blame] | 823 | |
| 824 | cleanup: |
Ilia Mirkin | dd9b15d | 2011-03-13 00:29:00 -0500 | [diff] [blame] | 825 | kfree(msginfo); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 826 | |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 827 | return ret; |
| 828 | } |
| 829 | |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 830 | /* |
| 831 | * Retrieve the (sub) channel on which to send an outgoing request. |
| 832 | * When a primary channel has multiple sub-channels, we choose a |
| 833 | * channel whose VCPU binding is closest to the VCPU on which |
| 834 | * this call is being made. |
| 835 | */ |
| 836 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) |
| 837 | { |
| 838 | struct list_head *cur, *tmp; |
K. Y. Srinivasan | 87712bf8 | 2014-12-14 23:34:51 -0800 | [diff] [blame] | 839 | int cur_cpu; |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 840 | struct vmbus_channel *cur_channel; |
| 841 | struct vmbus_channel *outgoing_channel = primary; |
| 842 | int cpu_distance, new_cpu_distance; |
| 843 | |
| 844 | if (list_empty(&primary->sc_list)) |
| 845 | return outgoing_channel; |
| 846 | |
K. Y. Srinivasan | 87712bf8 | 2014-12-14 23:34:51 -0800 | [diff] [blame] | 847 | cur_cpu = hv_context.vp_index[get_cpu()]; |
| 848 | put_cpu(); |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 849 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
| 850 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); |
| 851 | if (cur_channel->state != CHANNEL_OPENED_STATE) |
| 852 | continue; |
| 853 | |
| 854 | if (cur_channel->target_vp == cur_cpu) |
| 855 | return cur_channel; |
| 856 | |
| 857 | cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ? |
| 858 | (outgoing_channel->target_vp - cur_cpu) : |
| 859 | (cur_cpu - outgoing_channel->target_vp)); |
| 860 | |
| 861 | new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ? |
| 862 | (cur_channel->target_vp - cur_cpu) : |
| 863 | (cur_cpu - cur_channel->target_vp)); |
| 864 | |
| 865 | if (cpu_distance < new_cpu_distance) |
| 866 | continue; |
| 867 | |
| 868 | outgoing_channel = cur_channel; |
| 869 | } |
| 870 | |
| 871 | return outgoing_channel; |
| 872 | } |
| 873 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); |
| 874 | |
| 875 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) |
| 876 | { |
| 877 | struct list_head *cur, *tmp; |
| 878 | struct vmbus_channel *cur_channel; |
| 879 | |
| 880 | if (primary_channel->sc_creation_callback == NULL) |
| 881 | return; |
| 882 | |
| 883 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { |
| 884 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); |
| 885 | |
| 886 | primary_channel->sc_creation_callback(cur_channel); |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, |
| 891 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) |
| 892 | { |
| 893 | primary_channel->sc_creation_callback = sc_cr_cb; |
| 894 | } |
| 895 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); |
| 896 | |
| 897 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) |
| 898 | { |
| 899 | bool ret; |
| 900 | |
| 901 | ret = !list_empty(&primary->sc_list); |
| 902 | |
| 903 | if (ret) { |
| 904 | /* |
| 905 | * Invoke the callback on sub-channel creation. |
| 906 | * This will present a uniform interface to the |
| 907 | * clients. |
| 908 | */ |
| 909 | invoke_sc_cb(primary); |
| 910 | } |
| 911 | |
| 912 | return ret; |
| 913 | } |
| 914 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |