diff options
Diffstat (limited to 'drivers/hv/channel_mgmt.c')
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 571 |
1 files changed, 571 insertions, 0 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c new file mode 100644 index 00000000..9ffbfc57 --- /dev/null +++ b/drivers/hv/channel_mgmt.c @@ -0,0 +1,571 @@ +/* + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Haiyang Zhang <haiyangz@microsoft.com> + * Hank Janssen <hjanssen@microsoft.com> + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/completion.h> +#include <linux/hyperv.h> + +#include "hyperv_vmbus.h" + +struct vmbus_channel_message_table_entry { + enum vmbus_channel_message_type message_type; + void (*message_handler)(struct vmbus_channel_message_header *msg); +}; + + +/** + * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message + * @icmsghdrp: Pointer to msg header structure + * @icmsg_negotiate: Pointer to negotiate message structure + * @buf: Raw buffer channel data + * + * @icmsghdrp is of type &struct icmsg_hdr. + * @negop is of type &struct icmsg_negotiate. + * Set up and fill in default negotiate response message. This response can + * come from both the vmbus driver and the hv_utils driver. The current api + * will respond properly to both Windows 2008 and Windows 2008-R2 operating + * systems. + * + * Mainly used by Hyper-V drivers. + */ +void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, + struct icmsg_negotiate *negop, u8 *buf) +{ + if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { + icmsghdrp->icmsgsize = 0x10; + + negop = (struct icmsg_negotiate *)&buf[ + sizeof(struct vmbuspipe_hdr) + + sizeof(struct icmsg_hdr)]; + + if (negop->icframe_vercnt == 2 && + negop->icversion_data[1].major == 3) { + negop->icversion_data[0].major = 3; + negop->icversion_data[0].minor = 0; + negop->icversion_data[1].major = 3; + negop->icversion_data[1].minor = 0; + } else { + negop->icversion_data[0].major = 1; + negop->icversion_data[0].minor = 0; + negop->icversion_data[1].major = 1; + negop->icversion_data[1].minor = 0; + } + + negop->icframe_vercnt = 1; + negop->icmsg_vercnt = 1; + } +} +EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); + +/* + * alloc_channel - Allocate and initialize a vmbus channel object + */ +static struct vmbus_channel *alloc_channel(void) +{ + struct vmbus_channel *channel; + + channel = kzalloc(sizeof(*channel), GFP_ATOMIC); + if (!channel) + return NULL; + + spin_lock_init(&channel->inbound_lock); + + channel->controlwq = create_workqueue("hv_vmbus_ctl"); + if (!channel->controlwq) { + kfree(channel); + return NULL; + } + + return channel; +} + +/* + * release_hannel - Release the vmbus channel object itself + */ +static void release_channel(struct work_struct *work) +{ + struct vmbus_channel *channel = container_of(work, + struct vmbus_channel, + work); + + destroy_workqueue(channel->controlwq); + + kfree(channel); +} + +/* + * free_channel - Release the resources used by the vmbus channel object + */ +static void free_channel(struct vmbus_channel *channel) +{ + + /* + * We have to release the channel's workqueue/thread in the vmbus's + * workqueue/thread context + * ie we can't destroy ourselves. + */ + INIT_WORK(&channel->work, release_channel); + queue_work(vmbus_connection.work_queue, &channel->work); +} + + + +/* + * vmbus_process_rescind_offer - + * Rescind the offer by initiating a device removal + */ +static void vmbus_process_rescind_offer(struct work_struct *work) +{ + struct vmbus_channel *channel = container_of(work, + struct vmbus_channel, + work); + + vmbus_device_unregister(channel->device_obj); +} + +void vmbus_free_channels(void) +{ + struct vmbus_channel *channel; + + list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { + vmbus_device_unregister(channel->device_obj); + kfree(channel->device_obj); + free_channel(channel); + } +} + +/* + * vmbus_process_offer - Process the offer by creating a channel/device + * associated with this offer + */ +static void vmbus_process_offer(struct work_struct *work) +{ + struct vmbus_channel *newchannel = container_of(work, + struct vmbus_channel, + work); + struct vmbus_channel *channel; + bool fnew = true; + int ret; + unsigned long flags; + + /* The next possible work is rescind handling */ + INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); + + /* Make sure this is a new offer */ + spin_lock_irqsave(&vmbus_connection.channel_lock, flags); + + list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { + if (!uuid_le_cmp(channel->offermsg.offer.if_type, + newchannel->offermsg.offer.if_type) && + !uuid_le_cmp(channel->offermsg.offer.if_instance, + newchannel->offermsg.offer.if_instance)) { + fnew = false; + break; + } + } + + if (fnew) + list_add_tail(&newchannel->listentry, + &vmbus_connection.chn_list); + + spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); + + if (!fnew) { + free_channel(newchannel); + return; + } + + /* + * Start the process of binding this offer to the driver + * We need to set the DeviceObject field before calling + * vmbus_child_dev_add() + */ + newchannel->device_obj = vmbus_device_create( + &newchannel->offermsg.offer.if_type, + &newchannel->offermsg.offer.if_instance, + newchannel); + + /* + * Add the new device to the bus. This will kick off device-driver + * binding which eventually invokes the device driver's AddDevice() + * method. + */ + ret = vmbus_device_register(newchannel->device_obj); + if (ret != 0) { + pr_err("unable to add child device object (relid %d)\n", + newchannel->offermsg.child_relid); + + spin_lock_irqsave(&vmbus_connection.channel_lock, flags); + list_del(&newchannel->listentry); + spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); + kfree(newchannel->device_obj); + + free_channel(newchannel); + } else { + /* + * This state is used to indicate a successful open + * so that when we do close the channel normally, we + * can cleanup properly + */ + newchannel->state = CHANNEL_OPEN_STATE; + } +} + +/* + * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. + * + */ +static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) +{ + struct vmbus_channel_offer_channel *offer; + struct vmbus_channel *newchannel; + uuid_le *guidtype; + uuid_le *guidinstance; + + offer = (struct vmbus_channel_offer_channel *)hdr; + + guidtype = &offer->offer.if_type; + guidinstance = &offer->offer.if_instance; + + /* Allocate the channel object and save this offer. */ + newchannel = alloc_channel(); + if (!newchannel) { + pr_err("Unable to allocate channel object\n"); + return; + } + + memcpy(&newchannel->offermsg, offer, + sizeof(struct vmbus_channel_offer_channel)); + newchannel->monitor_grp = (u8)offer->monitorid / 32; + newchannel->monitor_bit = (u8)offer->monitorid % 32; + + INIT_WORK(&newchannel->work, vmbus_process_offer); + queue_work(newchannel->controlwq, &newchannel->work); +} + +/* + * vmbus_onoffer_rescind - Rescind offer handler. + * + * We queue a work item to process this offer synchronously + */ +static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) +{ + struct vmbus_channel_rescind_offer *rescind; + struct vmbus_channel *channel; + + rescind = (struct vmbus_channel_rescind_offer *)hdr; + channel = relid2channel(rescind->child_relid); + + if (channel == NULL) + /* Just return here, no channel found */ + return; + + /* work is initialized for vmbus_process_rescind_offer() from + * vmbus_process_offer() where the channel got created */ + queue_work(channel->controlwq, &channel->work); +} + +/* + * vmbus_onoffers_delivered - + * This is invoked when all offers have been delivered. + * + * Nothing to do here. + */ +static void vmbus_onoffers_delivered( + struct vmbus_channel_message_header *hdr) +{ +} + +/* + * vmbus_onopen_result - Open result handler. + * + * This is invoked when we received a response to our channel open request. + * Find the matching request, copy the response and signal the requesting + * thread. + */ +static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) +{ + struct vmbus_channel_open_result *result; + struct vmbus_channel_msginfo *msginfo; + struct vmbus_channel_message_header *requestheader; + struct vmbus_channel_open_channel *openmsg; + unsigned long flags; + + result = (struct vmbus_channel_open_result *)hdr; + + /* + * Find the open msg, copy the result and signal/unblock the wait event + */ + spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); + + list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, + msglistentry) { + requestheader = + (struct vmbus_channel_message_header *)msginfo->msg; + + if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { + openmsg = + (struct vmbus_channel_open_channel *)msginfo->msg; + if (openmsg->child_relid == result->child_relid && + openmsg->openid == result->openid) { + memcpy(&msginfo->response.open_result, + result, + sizeof( + struct vmbus_channel_open_result)); + complete(&msginfo->waitevent); + break; + } + } + } + spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); +} + +/* + * vmbus_ongpadl_created - GPADL created handler. + * + * This is invoked when we received a response to our gpadl create request. + * Find the matching request, copy the response and signal the requesting + * thread. + */ +static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) +{ + struct vmbus_channel_gpadl_created *gpadlcreated; + struct vmbus_channel_msginfo *msginfo; + struct vmbus_channel_message_header *requestheader; + struct vmbus_channel_gpadl_header *gpadlheader; + unsigned long flags; + + gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; + + /* + * Find the establish msg, copy the result and signal/unblock the wait + * event + */ + spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); + + list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, + msglistentry) { + requestheader = + (struct vmbus_channel_message_header *)msginfo->msg; + + if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { + gpadlheader = + (struct vmbus_channel_gpadl_header *)requestheader; + + if ((gpadlcreated->child_relid == + gpadlheader->child_relid) && + (gpadlcreated->gpadl == gpadlheader->gpadl)) { + memcpy(&msginfo->response.gpadl_created, + gpadlcreated, + sizeof( + struct vmbus_channel_gpadl_created)); + complete(&msginfo->waitevent); + break; + } + } + } + spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); +} + +/* + * vmbus_ongpadl_torndown - GPADL torndown handler. + * + * This is invoked when we received a response to our gpadl teardown request. + * Find the matching request, copy the response and signal the requesting + * thread. + */ +static void vmbus_ongpadl_torndown( + struct vmbus_channel_message_header *hdr) +{ + struct vmbus_channel_gpadl_torndown *gpadl_torndown; + struct vmbus_channel_msginfo *msginfo; + struct vmbus_channel_message_header *requestheader; + struct vmbus_channel_gpadl_teardown *gpadl_teardown; + unsigned long flags; + + gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; + + /* + * Find the open msg, copy the result and signal/unblock the wait event + */ + spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); + + list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, + msglistentry) { + requestheader = + (struct vmbus_channel_message_header *)msginfo->msg; + + if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { + gpadl_teardown = + (struct vmbus_channel_gpadl_teardown *)requestheader; + + if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { + memcpy(&msginfo->response.gpadl_torndown, + gpadl_torndown, + sizeof( + struct vmbus_channel_gpadl_torndown)); + complete(&msginfo->waitevent); + break; + } + } + } + spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); +} + +/* + * vmbus_onversion_response - Version response handler + * + * This is invoked when we received a response to our initiate contact request. + * Find the matching request, copy the response and signal the requesting + * thread. + */ +static void vmbus_onversion_response( + struct vmbus_channel_message_header *hdr) +{ + struct vmbus_channel_msginfo *msginfo; + struct vmbus_channel_message_header *requestheader; + struct vmbus_channel_initiate_contact *initiate; + struct vmbus_channel_version_response *version_response; + unsigned long flags; + + version_response = (struct vmbus_channel_version_response *)hdr; + spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); + + list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, + msglistentry) { + requestheader = + (struct vmbus_channel_message_header *)msginfo->msg; + + if (requestheader->msgtype == + CHANNELMSG_INITIATE_CONTACT) { + initiate = + (struct vmbus_channel_initiate_contact *)requestheader; + memcpy(&msginfo->response.version_response, + version_response, + sizeof(struct vmbus_channel_version_response)); + complete(&msginfo->waitevent); + } + } + spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); +} + +/* Channel message dispatch table */ +static struct vmbus_channel_message_table_entry + channel_message_table[CHANNELMSG_COUNT] = { + {CHANNELMSG_INVALID, NULL}, + {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, + {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, + {CHANNELMSG_REQUESTOFFERS, NULL}, + {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, + {CHANNELMSG_OPENCHANNEL, NULL}, + {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, + {CHANNELMSG_CLOSECHANNEL, NULL}, + {CHANNELMSG_GPADL_HEADER, NULL}, + {CHANNELMSG_GPADL_BODY, NULL}, + {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, + {CHANNELMSG_GPADL_TEARDOWN, NULL}, + {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, + {CHANNELMSG_RELID_RELEASED, NULL}, + {CHANNELMSG_INITIATE_CONTACT, NULL}, + {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, + {CHANNELMSG_UNLOAD, NULL}, +}; + +/* + * vmbus_onmessage - Handler for channel protocol messages. + * + * This is invoked in the vmbus worker thread context. + */ +void vmbus_onmessage(void *context) +{ + struct hv_message *msg = context; + struct vmbus_channel_message_header *hdr; + int size; + + hdr = (struct vmbus_channel_message_header *)msg->u.payload; + size = msg->header.payload_size; + + if (hdr->msgtype >= CHANNELMSG_COUNT) { + pr_err("Received invalid channel message type %d size %d\n", + hdr->msgtype, size); + print_hex_dump_bytes("", DUMP_PREFIX_NONE, + (unsigned char *)msg->u.payload, size); + return; + } + + if (channel_message_table[hdr->msgtype].message_handler) + channel_message_table[hdr->msgtype].message_handler(hdr); + else + pr_err("Unhandled channel message type %d\n", hdr->msgtype); +} + +/* + * vmbus_request_offers - Send a request to get all our pending offers. + */ +int vmbus_request_offers(void) +{ + struct vmbus_channel_message_header *msg; + struct vmbus_channel_msginfo *msginfo; + int ret, t; + + msginfo = kmalloc(sizeof(*msginfo) + + sizeof(struct vmbus_channel_message_header), + GFP_KERNEL); + if (!msginfo) + return -ENOMEM; + + init_completion(&msginfo->waitevent); + + msg = (struct vmbus_channel_message_header *)msginfo->msg; + + msg->msgtype = CHANNELMSG_REQUESTOFFERS; + + + ret = vmbus_post_msg(msg, + sizeof(struct vmbus_channel_message_header)); + if (ret != 0) { + pr_err("Unable to request offers - %d\n", ret); + + goto cleanup; + } + + t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); + if (t == 0) { + ret = -ETIMEDOUT; + goto cleanup; + } + + + +cleanup: + kfree(msginfo); + + return ret; +} + +/* eof */ |