Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright (c) 2009, Microsoft Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 16 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 17 | * |
| 18 | * Authors: |
| 19 | * Haiyang Zhang <haiyangz@microsoft.com> |
| 20 | * Hank Janssen <hjanssen@microsoft.com> |
| 21 | * |
| 22 | */ |
Hank Janssen | 0a46618 | 2011-03-29 13:58:47 -0700 | [diff] [blame] | 23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 24 | |
Greg Kroah-Hartman | a0086dc | 2009-08-17 17:22:08 -0700 | [diff] [blame] | 25 | #include <linux/kernel.h> |
K. Y. Srinivasan | 0c3b7b2 | 2011-02-11 09:59:43 -0800 | [diff] [blame] | 26 | #include <linux/sched.h> |
| 27 | #include <linux/wait.h> |
K. Y. Srinivasan | 5289d3d | 2011-08-25 09:49:01 -0700 | [diff] [blame] | 28 | #include <linux/delay.h> |
Greg Kroah-Hartman | a0086dc | 2009-08-17 17:22:08 -0700 | [diff] [blame] | 29 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/slab.h> |
Greg Kroah-Hartman | a0086dc | 2009-08-17 17:22:08 -0700 | [diff] [blame] | 31 | #include <linux/vmalloc.h> |
Greg Kroah-Hartman | 46a9719 | 2011-10-04 12:29:52 -0700 | [diff] [blame] | 32 | #include <linux/hyperv.h> |
K. Y. Srinivasan | 37f7278 | 2012-12-01 06:46:41 -0800 | [diff] [blame] | 33 | #include <linux/export.h> |
Greg Kroah-Hartman | 407dd16 | 2011-10-11 08:36:44 -0600 | [diff] [blame] | 34 | #include <asm/hyperv.h> |
K. Y. Srinivasan | 0f2a661 | 2011-05-12 19:34:28 -0700 | [diff] [blame] | 35 | #include "hyperv_vmbus.h" |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 36 | |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 37 | |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 38 | struct vmbus_connection vmbus_connection = { |
| 39 | .conn_state = DISCONNECTED, |
| 40 | .next_gpadl_handle = ATOMIC_INIT(0xE1E10), |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 43 | /* |
K. Y. Srinivasan | 37f7278 | 2012-12-01 06:46:41 -0800 | [diff] [blame] | 44 | * Negotiated protocol version with the host. |
| 45 | */ |
| 46 | __u32 vmbus_proto_version; |
| 47 | EXPORT_SYMBOL_GPL(vmbus_proto_version); |
| 48 | |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 49 | static __u32 vmbus_get_next_version(__u32 current_version) |
| 50 | { |
| 51 | switch (current_version) { |
| 52 | case (VERSION_WIN7): |
| 53 | return VERSION_WS2008; |
| 54 | |
| 55 | case (VERSION_WIN8): |
| 56 | return VERSION_WIN7; |
| 57 | |
K. Y. Srinivasan | 03367ef | 2014-04-03 18:02:45 -0700 | [diff] [blame] | 58 | case (VERSION_WIN8_1): |
| 59 | return VERSION_WIN8; |
| 60 | |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 61 | case (VERSION_WS2008): |
| 62 | default: |
| 63 | return VERSION_INVAL; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, |
| 68 | __u32 version) |
| 69 | { |
| 70 | int ret = 0; |
| 71 | struct vmbus_channel_initiate_contact *msg; |
| 72 | unsigned long flags; |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 73 | |
| 74 | init_completion(&msginfo->waitevent); |
| 75 | |
| 76 | msg = (struct vmbus_channel_initiate_contact *)msginfo->msg; |
| 77 | |
| 78 | msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT; |
| 79 | msg->vmbus_version_requested = version; |
| 80 | msg->interrupt_page = virt_to_phys(vmbus_connection.int_page); |
Greg Kroah-Hartman | 8681db4 | 2013-09-13 11:32:55 -0700 | [diff] [blame] | 81 | msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]); |
| 82 | msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]); |
K. Y. Srinivasan | 87712bf8 | 2014-12-14 23:34:51 -0800 | [diff] [blame] | 83 | if (version == VERSION_WIN8_1) { |
| 84 | msg->target_vcpu = hv_context.vp_index[get_cpu()]; |
| 85 | put_cpu(); |
| 86 | } |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 87 | |
| 88 | /* |
| 89 | * Add to list before we send the request since we may |
| 90 | * receive the response before returning from this routine |
| 91 | */ |
| 92 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 93 | list_add_tail(&msginfo->msglistentry, |
| 94 | &vmbus_connection.chn_msg_list); |
| 95 | |
| 96 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 97 | |
| 98 | ret = vmbus_post_msg(msg, |
| 99 | sizeof(struct vmbus_channel_initiate_contact)); |
| 100 | if (ret != 0) { |
| 101 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 102 | list_del(&msginfo->msglistentry); |
| 103 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, |
| 104 | flags); |
| 105 | return ret; |
| 106 | } |
| 107 | |
| 108 | /* Wait for the connection response */ |
K. Y. Srinivasan | 269f979 | 2014-01-16 11:59:58 -0800 | [diff] [blame] | 109 | wait_for_completion(&msginfo->waitevent); |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 110 | |
| 111 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
| 112 | list_del(&msginfo->msglistentry); |
| 113 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
| 114 | |
| 115 | /* Check if successful */ |
| 116 | if (msginfo->response.version_response.version_supported) { |
| 117 | vmbus_connection.conn_state = CONNECTED; |
| 118 | } else { |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 119 | return -ECONNREFUSED; |
| 120 | } |
| 121 | |
| 122 | return ret; |
| 123 | } |
| 124 | |
| 125 | /* |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 126 | * vmbus_connect - Sends a connect request on the partition service connection |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 127 | */ |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 128 | int vmbus_connect(void) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 129 | { |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 130 | int ret = 0; |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 131 | struct vmbus_channel_msginfo *msginfo = NULL; |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 132 | __u32 version; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 133 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 134 | /* Initialize the vmbus connection */ |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 135 | vmbus_connection.conn_state = CONNECTING; |
| 136 | vmbus_connection.work_queue = create_workqueue("hv_vmbus_con"); |
| 137 | if (!vmbus_connection.work_queue) { |
K. Y. Srinivasan | 3a7546d | 2011-06-06 15:50:10 -0700 | [diff] [blame] | 138 | ret = -ENOMEM; |
K. Y. Srinivasan | b004386 | 2011-05-10 07:55:44 -0700 | [diff] [blame] | 139 | goto cleanup; |
Bill Pemberton | de65a38 | 2009-07-29 17:00:09 -0400 | [diff] [blame] | 140 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 141 | |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 142 | INIT_LIST_HEAD(&vmbus_connection.chn_msg_list); |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 143 | spin_lock_init(&vmbus_connection.channelmsg_lock); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 144 | |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 145 | INIT_LIST_HEAD(&vmbus_connection.chn_list); |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 146 | spin_lock_init(&vmbus_connection.channel_lock); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 147 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 148 | /* |
| 149 | * Setup the vmbus event connection for channel interrupt |
| 150 | * abstraction stuff |
| 151 | */ |
K. Y. Srinivasan | df3493e | 2011-02-11 09:59:00 -0800 | [diff] [blame] | 152 | vmbus_connection.int_page = |
| 153 | (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0); |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 154 | if (vmbus_connection.int_page == NULL) { |
K. Y. Srinivasan | 3a7546d | 2011-06-06 15:50:10 -0700 | [diff] [blame] | 155 | ret = -ENOMEM; |
K. Y. Srinivasan | b004386 | 2011-05-10 07:55:44 -0700 | [diff] [blame] | 156 | goto cleanup; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 159 | vmbus_connection.recv_int_page = vmbus_connection.int_page; |
| 160 | vmbus_connection.send_int_page = |
| 161 | (void *)((unsigned long)vmbus_connection.int_page + |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 162 | (PAGE_SIZE >> 1)); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 163 | |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 164 | /* |
| 165 | * Setup the monitor notification facility. The 1st page for |
| 166 | * parent->child and the 2nd page for child->parent |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 167 | */ |
Greg Kroah-Hartman | 8681db4 | 2013-09-13 11:32:55 -0700 | [diff] [blame] | 168 | vmbus_connection.monitor_pages[0] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0); |
| 169 | vmbus_connection.monitor_pages[1] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0); |
| 170 | if ((vmbus_connection.monitor_pages[0] == NULL) || |
| 171 | (vmbus_connection.monitor_pages[1] == NULL)) { |
K. Y. Srinivasan | 3a7546d | 2011-06-06 15:50:10 -0700 | [diff] [blame] | 172 | ret = -ENOMEM; |
K. Y. Srinivasan | b004386 | 2011-05-10 07:55:44 -0700 | [diff] [blame] | 173 | goto cleanup; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 176 | msginfo = kzalloc(sizeof(*msginfo) + |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 177 | sizeof(struct vmbus_channel_initiate_contact), |
| 178 | GFP_KERNEL); |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 179 | if (msginfo == NULL) { |
Bill Pemberton | 8cad0af | 2010-05-05 15:27:32 -0400 | [diff] [blame] | 180 | ret = -ENOMEM; |
K. Y. Srinivasan | b004386 | 2011-05-10 07:55:44 -0700 | [diff] [blame] | 181 | goto cleanup; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 184 | /* |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 185 | * Negotiate a compatible VMBUS version number with the |
| 186 | * host. We start with the highest number we can support |
| 187 | * and work our way down until we negotiate a compatible |
| 188 | * version. |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 189 | */ |
Bill Pemberton | 53af545 | 2009-09-11 21:46:44 -0400 | [diff] [blame] | 190 | |
K. Y. Srinivasan | 2a5c43a | 2012-12-01 06:46:56 -0800 | [diff] [blame] | 191 | version = VERSION_CURRENT; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 192 | |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 193 | do { |
| 194 | ret = vmbus_negotiate_version(msginfo, version); |
K. Y. Srinivasan | 8bbf9f4 | 2013-09-04 15:41:58 -0700 | [diff] [blame] | 195 | if (ret == -ETIMEDOUT) |
K. Y. Srinivasan | 666b9ad | 2013-08-28 14:56:54 -0700 | [diff] [blame] | 196 | goto cleanup; |
| 197 | |
| 198 | if (vmbus_connection.conn_state == CONNECTED) |
K. Y. Srinivasan | 610071c | 2012-12-01 06:46:38 -0800 | [diff] [blame] | 199 | break; |
| 200 | |
| 201 | version = vmbus_get_next_version(version); |
| 202 | } while (version != VERSION_INVAL); |
| 203 | |
| 204 | if (version == VERSION_INVAL) |
K. Y. Srinivasan | b004386 | 2011-05-10 07:55:44 -0700 | [diff] [blame] | 205 | goto cleanup; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 206 | |
K. Y. Srinivasan | 37f7278 | 2012-12-01 06:46:41 -0800 | [diff] [blame] | 207 | vmbus_proto_version = version; |
K. Y. Srinivasan | 3bacaf0c | 2012-12-01 06:46:59 -0800 | [diff] [blame] | 208 | pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d; Vmbus version:%d.%d\n", |
| 209 | host_info_eax, host_info_ebx >> 16, |
| 210 | host_info_ebx & 0xFFFF, host_info_ecx, |
| 211 | host_info_edx >> 24, host_info_edx & 0xFFFFFF, |
| 212 | version >> 16, version & 0xFFFF); |
| 213 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 214 | kfree(msginfo); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 215 | return 0; |
| 216 | |
K. Y. Srinivasan | b004386 | 2011-05-10 07:55:44 -0700 | [diff] [blame] | 217 | cleanup: |
K. Y. Srinivasan | 3bacaf0c | 2012-12-01 06:46:59 -0800 | [diff] [blame] | 218 | pr_err("Unable to connect to host\n"); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 219 | |
Vitaly Kuznetsov | 09a1962 | 2015-02-27 11:25:54 -0800 | [diff] [blame] | 220 | vmbus_connection.conn_state = DISCONNECTED; |
| 221 | vmbus_disconnect(); |
| 222 | |
| 223 | kfree(msginfo); |
| 224 | |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | void vmbus_disconnect(void) |
| 229 | { |
| 230 | if (vmbus_connection.work_queue) { |
| 231 | drain_workqueue(vmbus_connection.work_queue); |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 232 | destroy_workqueue(vmbus_connection.work_queue); |
Vitaly Kuznetsov | 09a1962 | 2015-02-27 11:25:54 -0800 | [diff] [blame] | 233 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 234 | |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 235 | if (vmbus_connection.int_page) { |
K. Y. Srinivasan | df3493e | 2011-02-11 09:59:00 -0800 | [diff] [blame] | 236 | free_pages((unsigned long)vmbus_connection.int_page, 0); |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 237 | vmbus_connection.int_page = NULL; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Radim Krčmář | a100d88d | 2014-05-27 19:16:20 +0200 | [diff] [blame] | 240 | free_pages((unsigned long)vmbus_connection.monitor_pages[0], 0); |
| 241 | free_pages((unsigned long)vmbus_connection.monitor_pages[1], 0); |
Greg Kroah-Hartman | 8681db4 | 2013-09-13 11:32:55 -0700 | [diff] [blame] | 242 | vmbus_connection.monitor_pages[0] = NULL; |
| 243 | vmbus_connection.monitor_pages[1] = NULL; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 244 | } |
| 245 | |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 246 | /* |
| 247 | * Map the given relid to the corresponding channel based on the |
| 248 | * per-cpu list of channels that have been affinitized to this CPU. |
| 249 | * This will be used in the channel callback path as we can do this |
| 250 | * mapping in a lock-free fashion. |
| 251 | */ |
| 252 | static struct vmbus_channel *pcpu_relid2channel(u32 relid) |
| 253 | { |
| 254 | struct vmbus_channel *channel; |
| 255 | struct vmbus_channel *found_channel = NULL; |
| 256 | int cpu = smp_processor_id(); |
| 257 | struct list_head *pcpu_head = &hv_context.percpu_list[cpu]; |
| 258 | |
| 259 | list_for_each_entry(channel, pcpu_head, percpu_list) { |
| 260 | if (channel->offermsg.child_relid == relid) { |
| 261 | found_channel = channel; |
| 262 | break; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | return found_channel; |
| 267 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 268 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 269 | /* |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 270 | * relid2channel - Get the channel object given its |
| 271 | * child relative id (ie channel id) |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 272 | */ |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 273 | struct vmbus_channel *relid2channel(u32 relid) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 274 | { |
Greg Kroah-Hartman | aded716 | 2009-08-18 15:21:19 -0700 | [diff] [blame] | 275 | struct vmbus_channel *channel; |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 276 | struct vmbus_channel *found_channel = NULL; |
Greg Kroah-Hartman | 0f5e44c | 2009-07-15 14:57:16 -0700 | [diff] [blame] | 277 | unsigned long flags; |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 278 | struct list_head *cur, *tmp; |
| 279 | struct vmbus_channel *cur_sc; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 280 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 281 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
Haiyang Zhang | da9fcb7 | 2011-01-26 12:12:14 -0800 | [diff] [blame] | 282 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 283 | if (channel->offermsg.child_relid == relid) { |
| 284 | found_channel = channel; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 285 | break; |
K. Y. Srinivasan | e68d297 | 2013-05-23 12:02:32 -0700 | [diff] [blame] | 286 | } else if (!list_empty(&channel->sc_list)) { |
| 287 | /* |
| 288 | * Deal with sub-channels. |
| 289 | */ |
| 290 | list_for_each_safe(cur, tmp, &channel->sc_list) { |
| 291 | cur_sc = list_entry(cur, struct vmbus_channel, |
| 292 | sc_list); |
| 293 | if (cur_sc->offermsg.child_relid == relid) { |
| 294 | found_channel = cur_sc; |
| 295 | break; |
| 296 | } |
| 297 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 298 | } |
| 299 | } |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 300 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 301 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 302 | return found_channel; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 305 | /* |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 306 | * process_chn_event - Process a channel event notification |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 307 | */ |
Olaf Hering | 3543648 | 2011-04-16 18:50:40 +0200 | [diff] [blame] | 308 | static void process_chn_event(u32 relid) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 309 | { |
Greg Kroah-Hartman | aded716 | 2009-08-18 15:21:19 -0700 | [diff] [blame] | 310 | struct vmbus_channel *channel; |
K. Y. Srinivasan | f878f3d | 2012-12-01 06:46:35 -0800 | [diff] [blame] | 311 | void *arg; |
| 312 | bool read_state; |
| 313 | u32 bytes_to_read; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 314 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 315 | /* |
| 316 | * Find the channel based on this relid and invokes the |
| 317 | * channel callback to process the event |
| 318 | */ |
K. Y. Srinivasan | 3a28fa3 | 2014-04-08 18:45:54 -0700 | [diff] [blame] | 319 | channel = pcpu_relid2channel(relid); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 320 | |
K. Y. Srinivasan | 2432603 | 2011-08-31 14:35:57 -0700 | [diff] [blame] | 321 | if (!channel) { |
| 322 | pr_err("channel not found for relid - %u\n", relid); |
| 323 | return; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * A channel once created is persistent even when there |
| 328 | * is no driver handling the device. An unloading driver |
K. Y. Srinivasan | d3ba720 | 2014-04-08 18:45:53 -0700 | [diff] [blame] | 329 | * sets the onchannel_callback to NULL on the same CPU |
| 330 | * as where this interrupt is handled (in an interrupt context). |
| 331 | * Thus, checking and invoking the driver specific callback takes |
| 332 | * care of orderly unloading of the driver. |
K. Y. Srinivasan | 2432603 | 2011-08-31 14:35:57 -0700 | [diff] [blame] | 333 | */ |
| 334 | |
K. Y. Srinivasan | f878f3d | 2012-12-01 06:46:35 -0800 | [diff] [blame] | 335 | if (channel->onchannel_callback != NULL) { |
| 336 | arg = channel->channel_callback_context; |
| 337 | read_state = channel->batched_reading; |
| 338 | /* |
| 339 | * This callback reads the messages sent by the host. |
| 340 | * We can optimize host to guest signaling by ensuring: |
| 341 | * 1. While reading the channel, we disable interrupts from |
| 342 | * host. |
| 343 | * 2. Ensure that we process all posted messages from the host |
| 344 | * before returning from this callback. |
| 345 | * 3. Once we return, enable signaling from the host. Once this |
| 346 | * state is set we check to see if additional packets are |
| 347 | * available to read. In this case we repeat the process. |
| 348 | */ |
| 349 | |
| 350 | do { |
K. Y. Srinivasan | affb1af | 2014-07-07 16:34:24 -0700 | [diff] [blame] | 351 | if (read_state) |
| 352 | hv_begin_read(&channel->inbound); |
K. Y. Srinivasan | f878f3d | 2012-12-01 06:46:35 -0800 | [diff] [blame] | 353 | channel->onchannel_callback(arg); |
K. Y. Srinivasan | affb1af | 2014-07-07 16:34:24 -0700 | [diff] [blame] | 354 | if (read_state) |
| 355 | bytes_to_read = hv_end_read(&channel->inbound); |
| 356 | else |
| 357 | bytes_to_read = 0; |
K. Y. Srinivasan | f878f3d | 2012-12-01 06:46:35 -0800 | [diff] [blame] | 358 | } while (read_state && (bytes_to_read != 0)); |
| 359 | } else { |
K. Y. Srinivasan | 2432603 | 2011-08-31 14:35:57 -0700 | [diff] [blame] | 360 | pr_err("no channel callback for relid - %u\n", relid); |
K. Y. Srinivasan | f878f3d | 2012-12-01 06:46:35 -0800 | [diff] [blame] | 361 | } |
K. Y. Srinivasan | d9add43b | 2011-08-27 11:31:43 -0700 | [diff] [blame] | 362 | |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 363 | } |
| 364 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 365 | /* |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 366 | * vmbus_on_event - Handler for events |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 367 | */ |
K. Y. Srinivasan | 6de3d6a | 2011-03-10 14:05:16 -0800 | [diff] [blame] | 368 | void vmbus_on_event(unsigned long data) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 369 | { |
Olaf Hering | 3543648 | 2011-04-16 18:50:40 +0200 | [diff] [blame] | 370 | u32 dword; |
K. Y. Srinivasan | 6552ecd | 2012-12-01 06:46:49 -0800 | [diff] [blame] | 371 | u32 maxdword; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 372 | int bit; |
Olaf Hering | 3543648 | 2011-04-16 18:50:40 +0200 | [diff] [blame] | 373 | u32 relid; |
K. Y. Srinivasan | 6552ecd | 2012-12-01 06:46:49 -0800 | [diff] [blame] | 374 | u32 *recv_int_page = NULL; |
| 375 | void *page_addr; |
| 376 | int cpu = smp_processor_id(); |
| 377 | union hv_synic_event_flags *event; |
| 378 | |
| 379 | if ((vmbus_proto_version == VERSION_WS2008) || |
| 380 | (vmbus_proto_version == VERSION_WIN7)) { |
| 381 | maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5; |
| 382 | recv_int_page = vmbus_connection.recv_int_page; |
| 383 | } else { |
| 384 | /* |
| 385 | * When the host is win8 and beyond, the event page |
| 386 | * can be directly checked to get the id of the channel |
| 387 | * that has the interrupt pending. |
| 388 | */ |
| 389 | maxdword = HV_EVENT_FLAGS_DWORD_COUNT; |
| 390 | page_addr = hv_context.synic_event_page[cpu]; |
| 391 | event = (union hv_synic_event_flags *)page_addr + |
| 392 | VMBUS_MESSAGE_SINT; |
| 393 | recv_int_page = event->flags32; |
| 394 | } |
| 395 | |
| 396 | |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 397 | |
Bill Pemberton | 454f18a | 2009-07-27 16:47:24 -0400 | [diff] [blame] | 398 | /* Check events */ |
Olaf Hering | 242b45a | 2011-04-16 18:50:39 +0200 | [diff] [blame] | 399 | if (!recv_int_page) |
| 400 | return; |
| 401 | for (dword = 0; dword < maxdword; dword++) { |
| 402 | if (!recv_int_page[dword]) |
| 403 | continue; |
| 404 | for (bit = 0; bit < 32; bit++) { |
K. Y. Srinivasan | d9add43b | 2011-08-27 11:31:43 -0700 | [diff] [blame] | 405 | if (sync_test_and_clear_bit(bit, |
| 406 | (unsigned long *)&recv_int_page[dword])) { |
Olaf Hering | 242b45a | 2011-04-16 18:50:39 +0200 | [diff] [blame] | 407 | relid = (dword << 5) + bit; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 408 | |
K. Y. Srinivasan | d9add43b | 2011-08-27 11:31:43 -0700 | [diff] [blame] | 409 | if (relid == 0) |
K. Y. Srinivasan | 6d81d33 | 2011-05-10 07:55:45 -0700 | [diff] [blame] | 410 | /* |
| 411 | * Special case - vmbus |
| 412 | * channel protocol msg |
| 413 | */ |
Olaf Hering | 242b45a | 2011-04-16 18:50:39 +0200 | [diff] [blame] | 414 | continue; |
K. Y. Srinivasan | d9add43b | 2011-08-27 11:31:43 -0700 | [diff] [blame] | 415 | |
Olaf Hering | 3543648 | 2011-04-16 18:50:40 +0200 | [diff] [blame] | 416 | process_chn_event(relid); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 417 | } |
Olaf Hering | 242b45a | 2011-04-16 18:50:39 +0200 | [diff] [blame] | 418 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 419 | } |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 420 | } |
| 421 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 422 | /* |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 423 | * vmbus_post_msg - Send a msg on the vmbus's message connection |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 424 | */ |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 425 | int vmbus_post_msg(void *buffer, size_t buflen) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 426 | { |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 427 | union hv_connection_id conn_id; |
K. Y. Srinivasan | 5289d3d | 2011-08-25 09:49:01 -0700 | [diff] [blame] | 428 | int ret = 0; |
| 429 | int retries = 0; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 430 | |
Haiyang Zhang | 15b2f64 | 2011-01-26 12:12:07 -0800 | [diff] [blame] | 431 | conn_id.asu32 = 0; |
| 432 | conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID; |
K. Y. Srinivasan | 5289d3d | 2011-08-25 09:49:01 -0700 | [diff] [blame] | 433 | |
| 434 | /* |
| 435 | * hv_post_message() can have transient failures because of |
| 436 | * insufficient resources. Retry the operation a couple of |
| 437 | * times before giving up. |
| 438 | */ |
K. Y. Srinivasan | fdeebcc | 2014-08-27 16:25:31 -0700 | [diff] [blame] | 439 | while (retries < 10) { |
| 440 | ret = hv_post_message(conn_id, 1, buffer, buflen); |
| 441 | |
| 442 | switch (ret) { |
Dexuan Cui | 89f9f67 | 2015-02-27 11:25:59 -0800 | [diff] [blame^] | 443 | case HV_STATUS_INVALID_CONNECTION_ID: |
| 444 | /* |
| 445 | * We could get this if we send messages too |
| 446 | * frequently. |
| 447 | */ |
| 448 | ret = -EAGAIN; |
| 449 | break; |
| 450 | case HV_STATUS_INSUFFICIENT_MEMORY: |
K. Y. Srinivasan | fdeebcc | 2014-08-27 16:25:31 -0700 | [diff] [blame] | 451 | case HV_STATUS_INSUFFICIENT_BUFFERS: |
| 452 | ret = -ENOMEM; |
K. Y. Srinivasan | fdeebcc | 2014-08-27 16:25:31 -0700 | [diff] [blame] | 453 | break; |
| 454 | case HV_STATUS_SUCCESS: |
K. Y. Srinivasan | 5289d3d | 2011-08-25 09:49:01 -0700 | [diff] [blame] | 455 | return ret; |
K. Y. Srinivasan | fdeebcc | 2014-08-27 16:25:31 -0700 | [diff] [blame] | 456 | default: |
| 457 | pr_err("hv_post_msg() failed; error code:%d\n", ret); |
| 458 | return -EINVAL; |
| 459 | } |
| 460 | |
K. Y. Srinivasan | 5289d3d | 2011-08-25 09:49:01 -0700 | [diff] [blame] | 461 | retries++; |
Dexuan Cui | 89f9f67 | 2015-02-27 11:25:59 -0800 | [diff] [blame^] | 462 | msleep(1000); |
K. Y. Srinivasan | 5289d3d | 2011-08-25 09:49:01 -0700 | [diff] [blame] | 463 | } |
| 464 | return ret; |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 465 | } |
| 466 | |
Hank Janssen | 3e18951 | 2010-03-04 22:11:00 +0000 | [diff] [blame] | 467 | /* |
Haiyang Zhang | c697767 | 2011-01-26 12:12:08 -0800 | [diff] [blame] | 468 | * vmbus_set_event - Send an event notification to the parent |
Greg Kroah-Hartman | fd8b85e | 2009-08-31 11:40:14 -0700 | [diff] [blame] | 469 | */ |
K. Y. Srinivasan | 21c3bef | 2012-12-01 06:46:43 -0800 | [diff] [blame] | 470 | int vmbus_set_event(struct vmbus_channel *channel) |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 471 | { |
K. Y. Srinivasan | 21c3bef | 2012-12-01 06:46:43 -0800 | [diff] [blame] | 472 | u32 child_relid = channel->offermsg.child_relid; |
Bill Pemberton | 7c369f4 | 2009-07-29 17:00:11 -0400 | [diff] [blame] | 473 | |
K. Y. Srinivasan | 3be7777 | 2012-12-01 06:46:46 -0800 | [diff] [blame] | 474 | if (!channel->is_dedicated_interrupt) { |
| 475 | /* Each u32 represents 32 channels */ |
| 476 | sync_set_bit(child_relid & 31, |
| 477 | (unsigned long *)vmbus_connection.send_int_page + |
| 478 | (child_relid >> 5)); |
| 479 | } |
| 480 | |
| 481 | return hv_signal_event(channel->sig_event); |
Hank Janssen | 3e7ee49 | 2009-07-13 16:02:34 -0700 | [diff] [blame] | 482 | } |