cregit-Linux how code gets into the kernel

Release 4.17 drivers/hv/channel_mgmt.c

Directory: drivers/hv
/*
 * 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/interrupt.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/hyperv.h>
#include <asm/mshyperv.h>

#include "hyperv_vmbus.h"

static void init_vp_index(struct vmbus_channel *channel, u16 dev_type);


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


static const struct {
	
uuid_le guid;

} vmbus_unsupported_devs[] = {
	{ HV_AVMA1_GUID },
	{ HV_AVMA2_GUID },
	{ HV_RDV_GUID	},
};

/*
 * The rescinded channel may be blocked waiting for a response from the host;
 * take care of that.
 */

static void vmbus_rescind_cleanup(struct vmbus_channel *channel) { struct vmbus_channel_msginfo *msginfo; unsigned long flags; spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); channel->rescind = true; list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, msglistentry) { if (msginfo->waiting_channel == channel) { complete(&msginfo->waitevent); break; } } spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); }

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static bool is_unsupported_vmbus_devs(const uuid_le *guid) { int i; for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++) if (!uuid_le_cmp(*guid, vmbus_unsupported_devs[i].guid)) return true; return false; }

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Vitaly Kuznetsov47.69%133.33%
Total52100.00%3100.00%


static u16 hv_get_dev_type(const struct vmbus_channel *channel) { const uuid_le *guid = &channel->offermsg.offer.if_type; u16 i; if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid)) return HV_UNKNOWN; for (i = HV_IDE; i < HV_UNKNOWN; i++) { if (!uuid_le_cmp(*guid, vmbus_devs[i].guid)) return i; } pr_info("Unknown GUID: %pUl\n", guid); return i; }

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Haiyang Zhang22.27%133.33%
Total88100.00%3100.00%

/** * 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. * Set up and fill in default negotiate response message. * * The fw_version and fw_vercnt specifies the framework version that * we can support. * * The srv_version and srv_vercnt specifies the service * versions we can support. * * Versions are given in decreasing order. * * nego_fw_version and nego_srv_version store the selected protocol versions. * * Mainly used by Hyper-V drivers. */
bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, const int *fw_version, int fw_vercnt, const int *srv_version, int srv_vercnt, int *nego_fw_version, int *nego_srv_version) { int icframe_major, icframe_minor; int icmsg_major, icmsg_minor; int fw_major, fw_minor; int srv_major, srv_minor; int i, j; bool found_match = false; struct icmsg_negotiate *negop; icmsghdrp->icmsgsize = 0x10; negop = (struct icmsg_negotiate *)&buf[ sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr)]; icframe_major = negop->icframe_vercnt; icframe_minor = 0; icmsg_major = negop->icmsg_vercnt; icmsg_minor = 0; /* * Select the framework version number we will * support. */ for (i = 0; i < fw_vercnt; i++) { fw_major = (fw_version[i] >> 16); fw_minor = (fw_version[i] & 0xFFFF); for (j = 0; j < negop->icframe_vercnt; j++) { if ((negop->icversion_data[j].major == fw_major) && (negop->icversion_data[j].minor == fw_minor)) { icframe_major = negop->icversion_data[j].major; icframe_minor = negop->icversion_data[j].minor; found_match = true; break; } } if (found_match) break; } if (!found_match) goto fw_error; found_match = false; for (i = 0; i < srv_vercnt; i++) { srv_major = (srv_version[i] >> 16); srv_minor = (srv_version[i] & 0xFFFF); for (j = negop->icframe_vercnt; (j < negop->icframe_vercnt + negop->icmsg_vercnt); j++) { if ((negop->icversion_data[j].major == srv_major) && (negop->icversion_data[j].minor == srv_minor)) { icmsg_major = negop->icversion_data[j].major; icmsg_minor = negop->icversion_data[j].minor; found_match = true; break; } } if (found_match) break; } /* * Respond with the framework and service * version numbers we can support. */ fw_error: if (!found_match) { negop->icframe_vercnt = 0; negop->icmsg_vercnt = 0; } else { negop->icframe_vercnt = 1; negop->icmsg_vercnt = 1; } if (nego_fw_version) *nego_fw_version = (icframe_major << 16) | icframe_minor; if (nego_srv_version) *nego_srv_version = (icmsg_major << 16) | icmsg_minor; negop->icversion_data[0].major = icframe_major; negop->icversion_data[0].minor = icframe_minor; negop->icversion_data[1].major = icmsg_major; negop->icversion_data[1].minor = icmsg_minor; return found_match; }

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K. Y. Srinivasan21644.17%240.00%
Alex Ng15231.08%120.00%
Hank Janssen12024.54%120.00%
Greg Kroah-Hartman10.20%120.00%
Total489100.00%5100.00%

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->lock); init_completion(&channel->rescind_event); INIT_LIST_HEAD(&channel->sc_list); INIT_LIST_HEAD(&channel->percpu_list); tasklet_init(&channel->callback_event, vmbus_on_event, (unsigned long)channel); return channel; }

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Hank Janssen3034.48%19.09%
K. Y. Srinivasan2629.89%327.27%
Stephen Hemminger1618.39%19.09%
Greg Kroah-Hartman1314.94%436.36%
Haiyang Zhang11.15%19.09%
Vitaly Kuznetsov11.15%19.09%
Total87100.00%11100.00%

/* * free_channel - Release the resources used by the vmbus channel object */
static void free_channel(struct vmbus_channel *channel) { tasklet_kill(&channel->callback_event); kobject_put(&channel->kobj); }

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Hank Janssen933.33%114.29%
Greg Kroah-Hartman311.11%228.57%
Haiyang Zhang311.11%228.57%
Total27100.00%7100.00%


static void percpu_channel_enq(void *arg) { struct vmbus_channel *channel = arg; struct hv_per_cpu_context *hv_cpu = this_cpu_ptr(hv_context.cpu_context); list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list); }

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static void percpu_channel_deq(void *arg) { struct vmbus_channel *channel = arg; list_del_rcu(&channel->percpu_list); }

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K. Y. Srinivasan2496.00%150.00%
Stephen Hemminger14.00%150.00%
Total25100.00%2100.00%


static void vmbus_release_relid(u32 relid) { struct vmbus_channel_relid_released msg; int ret; memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); msg.child_relid = relid; msg.header.msgtype = CHANNELMSG_RELID_RELEASED; ret = vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released), true); trace_vmbus_release_relid(&msg, ret); }

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Vitaly Kuznetsov1522.06%233.33%
Timo Teräs68.82%116.67%
Dexuan Cui34.41%116.67%
Total68100.00%6100.00%


void hv_process_channel_removal(u32 relid) { unsigned long flags; struct vmbus_channel *primary_channel, *channel; BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); /* * Make sure channel is valid as we may have raced. */ channel = relid2channel(relid); if (!channel) return; BUG_ON(!channel->rescind); if (channel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(channel->target_cpu, percpu_channel_deq, channel, true); } else { percpu_channel_deq(channel); put_cpu(); } if (channel->primary_channel == NULL) { list_del(&channel->listentry); primary_channel = channel; } else { primary_channel = channel->primary_channel; spin_lock_irqsave(&primary_channel->lock, flags); list_del(&channel->sc_list); primary_channel->num_sc--; spin_unlock_irqrestore(&primary_channel->lock, flags); } /* * We need to free the bit for init_vp_index() to work in the case * of sub-channel, when we reload drivers like hv_netvsc. */ if (channel->affinity_policy == HV_LOCALIZED) cpumask_clear_cpu(channel->target_cpu, &primary_channel->alloced_cpus_in_node); vmbus_release_relid(relid); free_channel(channel); }

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K. Y. Srinivasan12968.98%850.00%
Dexuan Cui5026.74%531.25%
Vitaly Kuznetsov73.74%212.50%
Timo Teräs10.53%16.25%
Total187100.00%16100.00%


void vmbus_free_channels(void) { struct vmbus_channel *channel, *tmp; list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, listentry) { /* hv_process_channel_removal() needs this */ channel->rescind = true; vmbus_device_unregister(channel->device_obj); } }

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/* * vmbus_process_offer - Process the offer by creating a channel/device * associated with this offer */
static void vmbus_process_offer(struct vmbus_channel *newchannel) { struct vmbus_channel *channel; bool fnew = true; unsigned long flags; u16 dev_type; int ret; /* Make sure this is a new offer */ mutex_lock(&vmbus_connection.channel_mutex); /* * Now that we have acquired the channel_mutex, * we can release the potentially racing rescind thread. */ atomic_dec(&vmbus_connection.offer_in_progress); 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); mutex_unlock(&vmbus_connection.channel_mutex); if (!fnew) { /* * Check to see if this is a sub-channel. */ if (newchannel->offermsg.offer.sub_channel_index != 0) { /* * Process the sub-channel. */ newchannel->primary_channel = channel; spin_lock_irqsave(&channel->lock, flags); list_add_tail(&newchannel->sc_list, &channel->sc_list); channel->num_sc++; spin_unlock_irqrestore(&channel->lock, flags); } else { goto err_free_chan; } } dev_type = hv_get_dev_type(newchannel); init_vp_index(newchannel, dev_type); if (newchannel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(newchannel->target_cpu, percpu_channel_enq, newchannel, true); } else { percpu_channel_enq(newchannel); put_cpu(); } /* * 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; if (!fnew) { struct hv_device *dev = newchannel->primary_channel->device_obj; if (vmbus_add_channel_kobj(dev, newchannel)) { atomic_dec(&vmbus_connection.offer_in_progress); goto err_free_chan; } if (channel->sc_creation_callback != NULL) channel->sc_creation_callback(newchannel); newchannel->probe_done = true; return; } /* * Start the process of binding this offer to the driver * We need to set the DeviceObject field before calling * vmbus_child_dev_add() */ newchannel->device_obj = vmbus_device_create( &newchannel->offermsg.offer.if_type, &newchannel->offermsg.offer.if_instance, newchannel); if (!newchannel->device_obj) goto err_deq_chan; newchannel->device_obj->device_id = dev_type; /* * Add the new device to the bus. This will kick off device-driver * binding which eventually invokes the device driver's AddDevice() * method. */ ret = vmbus_device_register(newchannel->device_obj); if (ret != 0) { pr_err("unable to add child device object (relid %d)\n", newchannel->offermsg.child_relid); kfree(newchannel->device_obj); goto err_deq_chan; } newchannel->probe_done = true; return; err_deq_chan: mutex_lock(&vmbus_connection.channel_mutex); list_del(&newchannel->listentry); mutex_unlock(&vmbus_connection.channel_mutex); if (newchannel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(newchannel->target_cpu, percpu_channel_deq, newchannel, true); } else { percpu_channel_deq(newchannel); put_cpu(); } vmbus_release_relid(newchannel->offermsg.child_relid); err_free_chan: free_channel(newchannel); }

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K. Y. Srinivasan20541.08%1231.58%
Hank Janssen9819.64%12.63%
Dexuan Cui5010.02%410.53%
Haiyang Zhang489.62%718.42%
Vitaly Kuznetsov367.21%513.16%
Stephen Hemminger336.61%12.63%
Greg Kroah-Hartman193.81%513.16%
Bill Pemberton91.80%25.26%
Timo Teräs10.20%12.63%
Total499100.00%38100.00%

/* * We use this state to statically distribute the channel interrupt load. */ static int next_numa_node_id; /* * Starting with Win8, we can statically distribute the incoming * channel interrupt load by binding a channel to VCPU. * We distribute the interrupt loads to one or more NUMA nodes based on * the channel's affinity_policy. * * For pre-win8 hosts or non-performance critical channels we assign the * first CPU in the first NUMA node. */
static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) { u32 cur_cpu; bool perf_chn = vmbus_devs[dev_type].perf_device; struct vmbus_channel *primary = channel->primary_channel; int next_node; struct cpumask available_mask; struct cpumask *alloced_mask; if ((vmbus_proto_version == VERSION_WS2008) || (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { /* * Prior to win8, all channel interrupts are * delivered on cpu 0. * Also if the channel is not a performance critical * channel, bind it to cpu 0. */ channel->numa_node = 0; channel->target_cpu = 0; channel->target_vp = hv_cpu_number_to_vp_number(0); return; } /* * Based on the channel affinity policy, we will assign the NUMA * nodes. */ if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { while (true) { next_node = next_numa_node_id++; if (next_node == nr_node_ids) { next_node = next_numa_node_id = 0; continue; } if (cpumask_empty(cpumask_of_node(next_node))) continue; break; } channel->numa_node = next_node; primary = channel; } alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; if (cpumask_weight(alloced_mask) == cpumask_weight(cpumask_of_node(primary->numa_node))) { /* * We have cycled through all the CPUs in the node; * reset the alloced map. */ cpumask_clear(alloced_mask); } cpumask_xor(&available_mask, alloced_mask, cpumask_of_node(primary->numa_node)); cur_cpu = -1; if (primary->affinity_policy == HV_LOCALIZED) { /* * Normally Hyper-V host doesn't create more subchannels * than there are VCPUs on the node but it is possible when not * all present VCPUs on the node are initialized by guest. * Clear the alloced_cpus_in_node to start over. */ if (cpumask_equal(&primary->alloced_cpus_in_node, cpumask_of_node(primary->numa_node))) cpumask_clear(&primary->alloced_cpus_in_node); } while (true) { cur_cpu = cpumask_next(cur_cpu, &available_mask); if (cur_cpu >= nr_cpu_ids) { cur_cpu = -1; cpumask_copy(&available_mask, cpumask_of_node(primary->numa_node)); continue; } if (primary->affinity_policy == HV_LOCALIZED) { /* * NOTE: in the case of sub-channel, we clear the * sub-channel related bit(s) in * primary->alloced_cpus_in_node in * hv_process_channel_removal(), so when we * reload drivers like hv_netvsc in SMP guest, here * we're able to re-allocate * bit from primary->alloced_cpus_in_node. */ if (!cpumask_test_cpu(cur_cpu, &primary->alloced_cpus_in_node)) { cpumask_set_cpu(cur_cpu, &primary->alloced_cpus_in_node); cpumask_set_cpu(cur_cpu, alloced_mask); break; } } else { cpumask_set_cpu(cur_cpu, alloced_mask); break; } } channel->target_cpu = cur_cpu; channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); }

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Dexuan Cui6417.58%19.09%
Total364100.00%11100.00%


static void vmbus_wait_for_unload(void) { int cpu; void *page_addr; struct hv_message *msg; struct vmbus_channel_message_header *hdr; u32 message_type; /* * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was * used for initial contact or to CPU0 depending on host version. When * we're crashing on a different CPU let's hope that IRQ handler on * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still * functional and vmbus_unload_response() will complete * vmbus_connection.unload_event. If not, the last thing we can do is * read message pages for all CPUs directly. */ while (1) { if (completion_done(&vmbus_connection.unload_event)) break; for_each_online_cpu(cpu) { struct hv_per_cpu_context *hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); page_addr = hv_cpu->synic_message_page; msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; message_type = READ_ONCE(msg->header.message_type); if (message_type == HVMSG_NONE) continue; hdr = (struct vmbus_channel_message_header *) msg->u.payload; if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) complete(&vmbus_connection.unload_event); vmbus_signal_eom(msg, message_type); } mdelay(10); } /* * We're crashing and already got the UNLOAD_RESPONSE, cleanup all * maybe-pending messages on all CPUs to be able to receive new * messages after we reconnect. */ for_each_online_cpu(cpu) { struct hv_per_cpu_context *hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); page_addr = hv_cpu->synic_message_page; msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; msg->header.message_type = HVMSG_NONE; } }

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Stephen Hemminger3217.02%120.00%
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/* * vmbus_unload_response - Handler for the unload response. */
static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) { /* * This is a global event; just wakeup the waiting thread. * Once we successfully unload, we can cleanup the monitor state. */ complete(&vmbus_connection.unload_event); }

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void vmbus_initiate_unload(bool crash) { struct vmbus_channel_message_header hdr; /* Pre-Win2012R2 hosts don't support reconnect */ if (vmbus_proto_version < VERSION_WIN8_1) return; init_completion(&vmbus_connection.unload_event); memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); hdr.msgtype = CHANNELMSG_UNLOAD; vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header), !crash); /* * vmbus_initiate_unload() is also called on crash and the crash can be * happening in an interrupt context, where scheduling is impossible. */ if (!crash) wait_for_completion(&vmbus_connection.unload_event); else vmbus_wait_for_unload(); }

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Total81100.00%5100.00%

/* * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. * */
static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) { struct vmbus_channel_offer_channel *offer; struct vmbus_channel *newchannel; offer = (struct vmbus_channel_offer_channel *)hdr; trace_vmbus_onoffer(offer); /* Allocate the channel object and save this offer. */ newchannel = alloc_channel(); if (!newchannel) { vmbus_release_relid(offer->child_relid); atomic_dec(&vmbus_connection.offer_in_progress); pr_err("Unable to allocate channel object\n"); return; } /* * Setup state for signalling the host. */ newchannel->sig_event = VMBUS_EVENT_CONNECTION_ID; if (vmbus_proto_version != VERSION_WS2008) { newchannel->is_dedicated_interrupt = (offer->is_dedicated_interrupt != 0); newchannel->sig_event = offer->connection_id; } memcpy(&newchannel->offermsg, offer, sizeof(struct vmbus_channel_offer_channel)); newchannel->monitor_grp = (u8)offer->monitorid / 32; newchannel->monitor_bit = (u8)offer->monitorid % 32; vmbus_process_offer(newchannel); }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen5939.07%213.33%
K. Y. Srinivasan5033.11%320.00%
Greg Kroah-Hartman2013.25%426.67%
Haiyang Zhang149.27%320.00%
Vitaly Kuznetsov53.31%16.67%
Timo Teräs21.32%16.67%
Bill Pemberton10.66%16.67%
Total151100.00%15100.00%

/* * vmbus_onoffer_rescind - Rescind offer handler. * * We queue a work item to process this offer synchronously */
static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) { struct vmbus_channel_rescind_offer *rescind; struct vmbus_channel *channel; struct device *dev; rescind = (struct vmbus_channel_rescind_offer *)hdr; trace_vmbus_onoffer_rescind(rescind); /* * The offer msg and the corresponding rescind msg * from the host are guranteed to be ordered - * offer comes in first and then the rescind. * Since we process these events in work elements, * and with preemption, we may end up processing * the events out of order. Given that we handle these * work elements on the same CPU, this is possible only * in the case of preemption. In any case wait here * until the offer processing has moved beyond the * point where the channel is discoverable. */ while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { /* * We wait here until any channel offer is currently * being processed. */ msleep(1); } mutex_lock(&vmbus_connection.channel_mutex); channel = relid2channel(rescind->child_relid); mutex_unlock(&vmbus_connection.channel_mutex); if (channel == NULL) { /* * We failed in processing the offer message; * we would have cleaned up the relid in that * failure path. */ return; } /* * Now wait for offer handling to complete. */ vmbus_rescind_cleanup(channel); while (READ_ONCE(channel->probe_done) == false) { /* * We wait here until any channel offer is currently * being processed. */ msleep(1); } /* * At this point, the rescind handling can proceed safely. */ if (channel->device_obj) { if (channel->chn_rescind_callback) { channel->chn_rescind_callback(channel); return; } /* * We will have to unregister this device from the * driver core. */ dev = get_device(&channel->device_obj->device); if (dev) { vmbus_device_unregister(channel->device_obj); put_device(dev); } } if (channel->primary_channel != NULL) { /* * Sub-channel is being rescinded. Following is the channel * close sequence when initiated from the driveri (refer to * vmbus_close() for details): * 1. Close all sub-channels first * 2. Then close the primary channel. */ mutex_lock(&vmbus_connection.channel_mutex); if (channel->state == CHANNEL_OPEN_STATE) { /* * The channel is currently not open; * it is safe for us to cleanup the channel. */ hv_process_channel_removal(rescind->child_relid); } else { complete(&channel->rescind_event); } mutex_unlock(&vmbus_connection.channel_mutex); } }

Contributors

PersonTokensPropCommitsCommitProp
K. Y. Srinivasan11248.07%631.58%
Dexuan Cui6427.47%315.79%
Hank Janssen2812.02%15.26%
Greg Kroah-Hartman166.87%315.79%
Vitaly Kuznetsov93.86%210.53%
Haiyang Zhang31.29%315.79%
Timo Teräs10.43%15.26%
Total233100.00%19100.00%


void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) { BUG_ON(!is_hvsock_channel(channel)); /* We always get a rescind msg when a connection is closed. */ while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind)) msleep(1); vmbus_device_unregister(channel->device_obj); }

Contributors

PersonTokensPropCommitsCommitProp
Dexuan Cui50100.00%2100.00%
Total50100.00%2100.00%

EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); /* * vmbus_onoffers_delivered - * This is invoked when all offers have been delivered. * * Nothing to do here. */
static void vmbus_onoffers_delivered( struct vmbus_channel_message_header *hdr) { }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen550.00%125.00%
Greg Kroah-Hartman440.00%250.00%
Haiyang Zhang110.00%125.00%
Total10100.00%4100.00%

/* * vmbus_onopen_result - Open result handler. * * This is invoked when we received a response to our channel open request. * Find the matching request, copy the response and signal the requesting * thread. */
static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) { struct vmbus_channel_open_result *result; struct vmbus_channel_msginfo *msginfo; struct vmbus_channel_message_header *requestheader; struct vmbus_channel_open_channel *openmsg; unsigned long flags; result = (struct vmbus_channel_open_result *)hdr; trace_vmbus_onopen_result(result); /* * Find the open msg, copy the result and signal/unblock the wait event */ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, msglistentry) { requestheader = (struct vmbus_channel_message_header *)msginfo->msg; if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { openmsg = (struct vmbus_channel_open_channel *)msginfo->msg; if (openmsg->child_relid == result->child_relid && openmsg->openid == result->openid) { memcpy(&msginfo->response.open_result, result, sizeof( struct vmbus_channel_open_result)); complete(&msginfo->waitevent); break; } } } spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen8452.83%213.33%
Greg Kroah-Hartman4025.16%426.67%
Haiyang Zhang2716.98%533.33%
Vitaly Kuznetsov53.14%16.67%
K. Y. Srinivasan21.26%213.33%
Bill Pemberton10.63%16.67%
Total159100.00%15100.00%

/* * vmbus_ongpadl_created - GPADL created handler. * * This is invoked when we received a response to our gpadl create request. * Find the matching request, copy the response and signal the requesting * thread. */
static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) { struct vmbus_channel_gpadl_created *gpadlcreated; struct vmbus_channel_msginfo *msginfo; struct vmbus_channel_message_header *requestheader; struct vmbus_channel_gpadl_header *gpadlheader; unsigned long flags; gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; trace_vmbus_ongpadl_created(gpadlcreated); /* * Find the establish msg, copy the result and signal/unblock the wait * event */ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, msglistentry) { requestheader = (struct vmbus_channel_message_header *)msginfo->msg; if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { gpadlheader = (struct vmbus_channel_gpadl_header *)requestheader; if ((gpadlcreated->child_relid == gpadlheader->child_relid) && (gpadlcreated->gpadl == gpadlheader->gpadl)) { memcpy(&msginfo->response.gpadl_created, gpadlcreated, sizeof( struct vmbus_channel_gpadl_created)); complete(&msginfo->waitevent); break; } } } spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen8351.55%213.33%
Greg Kroah-Hartman3924.22%426.67%
Haiyang Zhang3119.25%533.33%
Vitaly Kuznetsov53.11%16.67%
K. Y. Srinivasan21.24%213.33%
Bill Pemberton10.62%16.67%
Total161100.00%15100.00%

/* * vmbus_ongpadl_torndown - GPADL torndown handler. * * This is invoked when we received a response to our gpadl teardown request. * Find the matching request, copy the response and signal the requesting * thread. */
static void vmbus_ongpadl_torndown( struct vmbus_channel_message_header *hdr) { struct vmbus_channel_gpadl_torndown *gpadl_torndown; struct vmbus_channel_msginfo *msginfo; struct vmbus_channel_message_header *requestheader; struct vmbus_channel_gpadl_teardown *gpadl_teardown; unsigned long flags; gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; trace_vmbus_ongpadl_torndown(gpadl_torndown); /* * Find the open msg, copy the result and signal/unblock the wait event */ spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, msglistentry) { requestheader = (struct vmbus_channel_message_header *)msginfo->msg; if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { gpadl_teardown = (struct vmbus_channel_gpadl_teardown *)requestheader; if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { memcpy(&msginfo->response.gpadl_torndown, gpadl_torndown, sizeof( struct vmbus_channel_gpadl_torndown)); complete(&msginfo->waitevent); break; } } } spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen7550.34%213.33%
Greg Kroah-Hartman3926.17%426.67%
Haiyang Zhang2718.12%533.33%
Vitaly Kuznetsov53.36%16.67%
K. Y. Srinivasan21.34%213.33%
Bill Pemberton10.67%16.67%
Total149100.00%15100.00%

/* * vmbus_onversion_response - Version response handler * * This is invoked when we received a response to our initiate contact request. * Find the matching request, copy the response and signal the requesting * thread. */
static void vmbus_onversion_response( struct vmbus_channel_message_header *hdr) { struct vmbus_channel_msginfo *msginfo; struct vmbus_channel_message_header *requestheader; struct vmbus_channel_version_response *version_response; unsigned long flags; version_response = (struct vmbus_channel_version_response *)hdr; trace_vmbus_onversion_response(version_response); spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, msglistentry) { requestheader = (struct vmbus_channel_message_header *)msginfo->msg; if (requestheader->msgtype == CHANNELMSG_INITIATE_CONTACT) { memcpy(&msginfo->response.version_response, version_response, sizeof(struct vmbus_channel_version_response)); complete(&msginfo->waitevent); } } spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen5948.76%213.33%
Greg Kroah-Hartman3428.10%426.67%
Haiyang Zhang2016.53%533.33%
Vitaly Kuznetsov54.13%16.67%
K. Y. Srinivasan21.65%213.33%
Bill Pemberton10.83%16.67%
Total121100.00%15100.00%

/* Channel message dispatch table */ const struct vmbus_channel_message_table_entry channel_message_table[CHANNELMSG_COUNT] = { { CHANNELMSG_INVALID, 0, NULL }, { CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer }, { CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind }, { CHANNELMSG_REQUESTOFFERS, 0, NULL }, { CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered }, { CHANNELMSG_OPENCHANNEL, 0, NULL }, { CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result }, { CHANNELMSG_CLOSECHANNEL, 0, NULL }, { CHANNELMSG_GPADL_HEADER, 0, NULL }, { CHANNELMSG_GPADL_BODY, 0, NULL }, { CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created }, { CHANNELMSG_GPADL_TEARDOWN, 0, NULL }, { CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown }, { CHANNELMSG_RELID_RELEASED, 0, NULL }, { CHANNELMSG_INITIATE_CONTACT, 0, NULL }, { CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response }, { CHANNELMSG_UNLOAD, 0, NULL }, { CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response }, { CHANNELMSG_18, 0, NULL }, { CHANNELMSG_19, 0, NULL }, { CHANNELMSG_20, 0, NULL }, { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, }; /* * vmbus_onmessage - Handler for channel protocol messages. * * This is invoked in the vmbus worker thread context. */
void vmbus_onmessage(void *context) { struct hv_message *msg = context; struct vmbus_channel_message_header *hdr; int size; hdr = (struct vmbus_channel_message_header *)msg->u.payload; size = msg->header.payload_size; trace_vmbus_on_message(hdr); if (hdr->msgtype >= CHANNELMSG_COUNT) { pr_err("Received invalid channel message type %d size %d\n", hdr->msgtype, size); print_hex_dump_bytes("", DUMP_PREFIX_NONE, (unsigned char *)msg->u.payload, size); return; } if (channel_message_table[hdr->msgtype].message_handler) channel_message_table[hdr->msgtype].message_handler(hdr); else pr_err("Unhandled channel message type %d\n", hdr->msgtype); }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen9172.80%215.38%
Haiyang Zhang1310.40%430.77%
Greg Kroah-Hartman129.60%430.77%
Vitaly Kuznetsov54.00%17.69%
K. Y. Srinivasan43.20%215.38%
Total125100.00%13100.00%

/* * vmbus_request_offers - Send a request to get all our pending offers. */
int vmbus_request_offers(void) { struct vmbus_channel_message_header *msg; struct vmbus_channel_msginfo *msginfo; int ret; msginfo = kmalloc(sizeof(*msginfo) + sizeof(struct vmbus_channel_message_header), GFP_KERNEL); if (!msginfo) return -ENOMEM; msg = (struct vmbus_channel_message_header *)msginfo->msg; msg->msgtype = CHANNELMSG_REQUESTOFFERS; ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header), true); trace_vmbus_request_offers(ret); if (ret != 0) { pr_err("Unable to request offers - %d\n", ret); goto cleanup; } cleanup: kfree(msginfo); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Hank Janssen6456.64%211.11%
Greg Kroah-Hartman1916.81%738.89%
Haiyang Zhang119.73%422.22%
Bill Pemberton87.08%15.56%
Vitaly Kuznetsov76.19%211.11%
K. Y. Srinivasan32.65%15.56%
Nicholas Mc Guire10.88%15.56%
Total113100.00%18100.00%

/* * Retrieve the (sub) channel on which to send an outgoing request. * When a primary channel has multiple sub-channels, we try to * distribute the load equally amongst all available channels. */
struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) { struct list_head *cur, *tmp; int cur_cpu; struct vmbus_channel *cur_channel; struct vmbus_channel *outgoing_channel = primary; int next_channel; int i = 1; if (list_empty(&primary->sc_list)) return outgoing_channel; next_channel = primary->next_oc++; if (next_channel > (primary->num_sc)) { primary->next_oc = 0; return outgoing_channel; } cur_cpu = hv_cpu_number_to_vp_number(smp_processor_id()); list_for_each_safe(cur, tmp, &primary->sc_list) { cur_channel = list_entry(cur, struct vmbus_channel, sc_list); if (cur_channel->state != CHANNEL_OPENED_STATE) continue; if (cur_channel->target_vp == cur_cpu) return cur_channel; if (i == next_channel) return cur_channel; i++; } return outgoing_channel; }

Contributors

PersonTokensPropCommitsCommitProp
K. Y. Srinivasan14597.32%375.00%
Vitaly Kuznetsov42.68%125.00%
Total149100.00%4100.00%

EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel);
static void invoke_sc_cb(struct vmbus_channel *primary_channel) { struct list_head *cur, *tmp; struct vmbus_channel *cur_channel; if (primary_channel->sc_creation_callback == NULL) return; list_for_each_safe(cur, tmp, &primary_channel->sc_list) { cur_channel = list_entry(cur, struct vmbus_channel, sc_list); primary_channel->sc_creation_callback(cur_channel); } }

Contributors

PersonTokensPropCommitsCommitProp
K. Y. Srinivasan62100.00%1100.00%
Total62100.00%1100.00%


void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, void (*sc_cr_cb)(struct vmbus_channel *new_sc)) { primary_channel->sc_creation_callback = sc_cr_cb; }

Contributors

PersonTokensPropCommitsCommitProp
K. Y. Srinivasan28100.00%1100.00%
Total28100.00%1100.00%

EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback);
bool vmbus_are_subchannels_present(struct vmbus_channel *primary) { bool ret; ret = !list_empty(&primary->sc_list); if (ret) { /* * Invoke the callback on sub-channel creation. * This will present a uniform interface to the * clients. */ invoke_sc_cb(primary); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
K. Y. Srinivasan39100.00%1100.00%
Total39100.00%1100.00%

EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present);
void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, void (*chn_rescind_cb)(struct vmbus_channel *)) { channel->chn_rescind_callback = chn_rescind_cb; }

Contributors

PersonTokensPropCommitsCommitProp
Dexuan Cui27100.00%1100.00%
Total27100.00%1100.00%

EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback);

Overall Contributors

PersonTokensPropCommitsCommitProp
K. Y. Srinivasan189942.24%4030.30%
Hank Janssen82018.24%43.03%
Dexuan Cui50911.32%1511.36%
Vitaly Kuznetsov3698.21%2518.94%
Greg Kroah-Hartman3557.90%2418.18%
Haiyang Zhang2425.38%129.09%
Alex Ng1533.40%10.76%
Stephen Hemminger1092.42%53.79%
Bill Pemberton250.56%32.27%
Timo Teräs110.24%10.76%
Tejun Heo30.07%10.76%
Nicholas Mc Guire10.02%10.76%
Total4496100.00%132100.00%
Directory: drivers/hv
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