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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d81274aae6
Starting with Windows 2012 R2, message inteerupts can be delivered on any VCPU in the guest. Support this functionality. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1346 lines
34 KiB
C
1346 lines
34 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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* K. Y. Srinivasan <kys@microsoft.com>
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/sysctl.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/completion.h>
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#include <linux/hyperv.h>
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#include <linux/kernel_stat.h>
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#include <linux/clockchips.h>
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#include <linux/cpu.h>
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#include <asm/hyperv.h>
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#include <asm/hypervisor.h>
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#include <asm/mshyperv.h>
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#include <linux/notifier.h>
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#include <linux/ptrace.h>
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#include <linux/screen_info.h>
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#include <linux/kdebug.h>
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#include "hyperv_vmbus.h"
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static struct acpi_device *hv_acpi_dev;
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static struct completion probe_event;
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static void hyperv_report_panic(struct pt_regs *regs)
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{
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static bool panic_reported;
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/*
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* We prefer to report panic on 'die' chain as we have proper
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* registers to report, but if we miss it (e.g. on BUG()) we need
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* to report it on 'panic'.
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*/
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if (panic_reported)
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return;
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panic_reported = true;
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wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip);
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wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax);
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wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx);
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wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx);
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wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx);
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/*
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* Let Hyper-V know there is crash data available
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*/
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wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY);
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}
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static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
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void *args)
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{
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struct pt_regs *regs;
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regs = current_pt_regs();
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hyperv_report_panic(regs);
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return NOTIFY_DONE;
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}
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static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
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void *args)
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{
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struct die_args *die = (struct die_args *)args;
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struct pt_regs *regs = die->regs;
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hyperv_report_panic(regs);
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return NOTIFY_DONE;
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}
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static struct notifier_block hyperv_die_block = {
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.notifier_call = hyperv_die_event,
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};
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static struct notifier_block hyperv_panic_block = {
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.notifier_call = hyperv_panic_event,
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};
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struct resource *hyperv_mmio;
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static int vmbus_exists(void)
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{
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if (hv_acpi_dev == NULL)
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return -ENODEV;
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return 0;
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}
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#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
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static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
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{
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int i;
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for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
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sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
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}
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static u8 channel_monitor_group(struct vmbus_channel *channel)
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{
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return (u8)channel->offermsg.monitorid / 32;
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}
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static u8 channel_monitor_offset(struct vmbus_channel *channel)
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{
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return (u8)channel->offermsg.monitorid % 32;
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}
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static u32 channel_pending(struct vmbus_channel *channel,
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struct hv_monitor_page *monitor_page)
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{
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u8 monitor_group = channel_monitor_group(channel);
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return monitor_page->trigger_group[monitor_group].pending;
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}
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static u32 channel_latency(struct vmbus_channel *channel,
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struct hv_monitor_page *monitor_page)
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{
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u8 monitor_group = channel_monitor_group(channel);
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u8 monitor_offset = channel_monitor_offset(channel);
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return monitor_page->latency[monitor_group][monitor_offset];
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}
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static u32 channel_conn_id(struct vmbus_channel *channel,
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struct hv_monitor_page *monitor_page)
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{
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u8 monitor_group = channel_monitor_group(channel);
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u8 monitor_offset = channel_monitor_offset(channel);
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return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id;
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}
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static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
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}
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static DEVICE_ATTR_RO(id);
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static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n", hv_dev->channel->state);
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}
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static DEVICE_ATTR_RO(state);
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static ssize_t monitor_id_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
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}
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static DEVICE_ATTR_RO(monitor_id);
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static ssize_t class_id_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "{%pUl}\n",
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hv_dev->channel->offermsg.offer.if_type.b);
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}
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static DEVICE_ATTR_RO(class_id);
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static ssize_t device_id_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "{%pUl}\n",
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hv_dev->channel->offermsg.offer.if_instance.b);
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}
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static DEVICE_ATTR_RO(device_id);
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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char alias_name[VMBUS_ALIAS_LEN + 1];
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print_alias_name(hv_dev, alias_name);
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return sprintf(buf, "vmbus:%s\n", alias_name);
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}
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static DEVICE_ATTR_RO(modalias);
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static ssize_t server_monitor_pending_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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channel_pending(hv_dev->channel,
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vmbus_connection.monitor_pages[1]));
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}
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static DEVICE_ATTR_RO(server_monitor_pending);
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static ssize_t client_monitor_pending_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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channel_pending(hv_dev->channel,
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vmbus_connection.monitor_pages[1]));
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}
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static DEVICE_ATTR_RO(client_monitor_pending);
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static ssize_t server_monitor_latency_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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channel_latency(hv_dev->channel,
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vmbus_connection.monitor_pages[0]));
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}
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static DEVICE_ATTR_RO(server_monitor_latency);
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static ssize_t client_monitor_latency_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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channel_latency(hv_dev->channel,
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vmbus_connection.monitor_pages[1]));
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}
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static DEVICE_ATTR_RO(client_monitor_latency);
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static ssize_t server_monitor_conn_id_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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channel_conn_id(hv_dev->channel,
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vmbus_connection.monitor_pages[0]));
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}
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static DEVICE_ATTR_RO(server_monitor_conn_id);
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static ssize_t client_monitor_conn_id_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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if (!hv_dev->channel)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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channel_conn_id(hv_dev->channel,
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vmbus_connection.monitor_pages[1]));
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}
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static DEVICE_ATTR_RO(client_monitor_conn_id);
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static ssize_t out_intr_mask_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info outbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
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return sprintf(buf, "%d\n", outbound.current_interrupt_mask);
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}
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static DEVICE_ATTR_RO(out_intr_mask);
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static ssize_t out_read_index_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info outbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
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return sprintf(buf, "%d\n", outbound.current_read_index);
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}
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static DEVICE_ATTR_RO(out_read_index);
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static ssize_t out_write_index_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info outbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
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return sprintf(buf, "%d\n", outbound.current_write_index);
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}
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static DEVICE_ATTR_RO(out_write_index);
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static ssize_t out_read_bytes_avail_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info outbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
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return sprintf(buf, "%d\n", outbound.bytes_avail_toread);
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}
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static DEVICE_ATTR_RO(out_read_bytes_avail);
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static ssize_t out_write_bytes_avail_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info outbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
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return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);
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}
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static DEVICE_ATTR_RO(out_write_bytes_avail);
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static ssize_t in_intr_mask_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info inbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
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return sprintf(buf, "%d\n", inbound.current_interrupt_mask);
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}
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static DEVICE_ATTR_RO(in_intr_mask);
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static ssize_t in_read_index_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info inbound;
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
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return sprintf(buf, "%d\n", inbound.current_read_index);
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}
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static DEVICE_ATTR_RO(in_read_index);
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static ssize_t in_write_index_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info inbound;
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|
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
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return sprintf(buf, "%d\n", inbound.current_write_index);
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}
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static DEVICE_ATTR_RO(in_write_index);
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static ssize_t in_read_bytes_avail_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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struct hv_ring_buffer_debug_info inbound;
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|
|
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if (!hv_dev->channel)
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return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
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return sprintf(buf, "%d\n", inbound.bytes_avail_toread);
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}
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static DEVICE_ATTR_RO(in_read_bytes_avail);
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|
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static ssize_t in_write_bytes_avail_show(struct device *dev,
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|
struct device_attribute *dev_attr,
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|
char *buf)
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|
{
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struct hv_device *hv_dev = device_to_hv_device(dev);
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|
struct hv_ring_buffer_debug_info inbound;
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|
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if (!hv_dev->channel)
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|
return -ENODEV;
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hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
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|
return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);
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|
}
|
|
static DEVICE_ATTR_RO(in_write_bytes_avail);
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|
|
|
static ssize_t channel_vp_mapping_show(struct device *dev,
|
|
struct device_attribute *dev_attr,
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|
char *buf)
|
|
{
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|
struct hv_device *hv_dev = device_to_hv_device(dev);
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|
struct vmbus_channel *channel = hv_dev->channel, *cur_sc;
|
|
unsigned long flags;
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int buf_size = PAGE_SIZE, n_written, tot_written;
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struct list_head *cur;
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|
|
if (!channel)
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return -ENODEV;
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|
|
|
tot_written = snprintf(buf, buf_size, "%u:%u\n",
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channel->offermsg.child_relid, channel->target_cpu);
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|
|
spin_lock_irqsave(&channel->lock, flags);
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|
list_for_each(cur, &channel->sc_list) {
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|
if (tot_written >= buf_size - 1)
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break;
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|
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|
cur_sc = list_entry(cur, struct vmbus_channel, sc_list);
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|
n_written = scnprintf(buf + tot_written,
|
|
buf_size - tot_written,
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|
"%u:%u\n",
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cur_sc->offermsg.child_relid,
|
|
cur_sc->target_cpu);
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|
tot_written += n_written;
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|
}
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|
|
|
spin_unlock_irqrestore(&channel->lock, flags);
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|
return tot_written;
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}
|
|
static DEVICE_ATTR_RO(channel_vp_mapping);
|
|
|
|
static ssize_t vendor_show(struct device *dev,
|
|
struct device_attribute *dev_attr,
|
|
char *buf)
|
|
{
|
|
struct hv_device *hv_dev = device_to_hv_device(dev);
|
|
return sprintf(buf, "0x%x\n", hv_dev->vendor_id);
|
|
}
|
|
static DEVICE_ATTR_RO(vendor);
|
|
|
|
static ssize_t device_show(struct device *dev,
|
|
struct device_attribute *dev_attr,
|
|
char *buf)
|
|
{
|
|
struct hv_device *hv_dev = device_to_hv_device(dev);
|
|
return sprintf(buf, "0x%x\n", hv_dev->device_id);
|
|
}
|
|
static DEVICE_ATTR_RO(device);
|
|
|
|
/* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
|
|
static struct attribute *vmbus_attrs[] = {
|
|
&dev_attr_id.attr,
|
|
&dev_attr_state.attr,
|
|
&dev_attr_monitor_id.attr,
|
|
&dev_attr_class_id.attr,
|
|
&dev_attr_device_id.attr,
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_server_monitor_pending.attr,
|
|
&dev_attr_client_monitor_pending.attr,
|
|
&dev_attr_server_monitor_latency.attr,
|
|
&dev_attr_client_monitor_latency.attr,
|
|
&dev_attr_server_monitor_conn_id.attr,
|
|
&dev_attr_client_monitor_conn_id.attr,
|
|
&dev_attr_out_intr_mask.attr,
|
|
&dev_attr_out_read_index.attr,
|
|
&dev_attr_out_write_index.attr,
|
|
&dev_attr_out_read_bytes_avail.attr,
|
|
&dev_attr_out_write_bytes_avail.attr,
|
|
&dev_attr_in_intr_mask.attr,
|
|
&dev_attr_in_read_index.attr,
|
|
&dev_attr_in_write_index.attr,
|
|
&dev_attr_in_read_bytes_avail.attr,
|
|
&dev_attr_in_write_bytes_avail.attr,
|
|
&dev_attr_channel_vp_mapping.attr,
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_device.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(vmbus);
|
|
|
|
/*
|
|
* vmbus_uevent - add uevent for our device
|
|
*
|
|
* This routine is invoked when a device is added or removed on the vmbus to
|
|
* generate a uevent to udev in the userspace. The udev will then look at its
|
|
* rule and the uevent generated here to load the appropriate driver
|
|
*
|
|
* The alias string will be of the form vmbus:guid where guid is the string
|
|
* representation of the device guid (each byte of the guid will be
|
|
* represented with two hex characters.
|
|
*/
|
|
static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
|
|
{
|
|
struct hv_device *dev = device_to_hv_device(device);
|
|
int ret;
|
|
char alias_name[VMBUS_ALIAS_LEN + 1];
|
|
|
|
print_alias_name(dev, alias_name);
|
|
ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name);
|
|
return ret;
|
|
}
|
|
|
|
static const uuid_le null_guid;
|
|
|
|
static inline bool is_null_guid(const uuid_le *guid)
|
|
{
|
|
if (uuid_le_cmp(*guid, null_guid))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Return a matching hv_vmbus_device_id pointer.
|
|
* If there is no match, return NULL.
|
|
*/
|
|
static const struct hv_vmbus_device_id *hv_vmbus_get_id(
|
|
const struct hv_vmbus_device_id *id,
|
|
const uuid_le *guid)
|
|
{
|
|
for (; !is_null_guid(&id->guid); id++)
|
|
if (!uuid_le_cmp(id->guid, *guid))
|
|
return id;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* vmbus_match - Attempt to match the specified device to the specified driver
|
|
*/
|
|
static int vmbus_match(struct device *device, struct device_driver *driver)
|
|
{
|
|
struct hv_driver *drv = drv_to_hv_drv(driver);
|
|
struct hv_device *hv_dev = device_to_hv_device(device);
|
|
|
|
/* The hv_sock driver handles all hv_sock offers. */
|
|
if (is_hvsock_channel(hv_dev->channel))
|
|
return drv->hvsock;
|
|
|
|
if (hv_vmbus_get_id(drv->id_table, &hv_dev->dev_type))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* vmbus_probe - Add the new vmbus's child device
|
|
*/
|
|
static int vmbus_probe(struct device *child_device)
|
|
{
|
|
int ret = 0;
|
|
struct hv_driver *drv =
|
|
drv_to_hv_drv(child_device->driver);
|
|
struct hv_device *dev = device_to_hv_device(child_device);
|
|
const struct hv_vmbus_device_id *dev_id;
|
|
|
|
dev_id = hv_vmbus_get_id(drv->id_table, &dev->dev_type);
|
|
if (drv->probe) {
|
|
ret = drv->probe(dev, dev_id);
|
|
if (ret != 0)
|
|
pr_err("probe failed for device %s (%d)\n",
|
|
dev_name(child_device), ret);
|
|
|
|
} else {
|
|
pr_err("probe not set for driver %s\n",
|
|
dev_name(child_device));
|
|
ret = -ENODEV;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* vmbus_remove - Remove a vmbus device
|
|
*/
|
|
static int vmbus_remove(struct device *child_device)
|
|
{
|
|
struct hv_driver *drv;
|
|
struct hv_device *dev = device_to_hv_device(child_device);
|
|
|
|
if (child_device->driver) {
|
|
drv = drv_to_hv_drv(child_device->driver);
|
|
if (drv->remove)
|
|
drv->remove(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* vmbus_shutdown - Shutdown a vmbus device
|
|
*/
|
|
static void vmbus_shutdown(struct device *child_device)
|
|
{
|
|
struct hv_driver *drv;
|
|
struct hv_device *dev = device_to_hv_device(child_device);
|
|
|
|
|
|
/* The device may not be attached yet */
|
|
if (!child_device->driver)
|
|
return;
|
|
|
|
drv = drv_to_hv_drv(child_device->driver);
|
|
|
|
if (drv->shutdown)
|
|
drv->shutdown(dev);
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* vmbus_device_release - Final callback release of the vmbus child device
|
|
*/
|
|
static void vmbus_device_release(struct device *device)
|
|
{
|
|
struct hv_device *hv_dev = device_to_hv_device(device);
|
|
struct vmbus_channel *channel = hv_dev->channel;
|
|
|
|
hv_process_channel_removal(channel,
|
|
channel->offermsg.child_relid);
|
|
kfree(hv_dev);
|
|
|
|
}
|
|
|
|
/* The one and only one */
|
|
static struct bus_type hv_bus = {
|
|
.name = "vmbus",
|
|
.match = vmbus_match,
|
|
.shutdown = vmbus_shutdown,
|
|
.remove = vmbus_remove,
|
|
.probe = vmbus_probe,
|
|
.uevent = vmbus_uevent,
|
|
.dev_groups = vmbus_groups,
|
|
};
|
|
|
|
struct onmessage_work_context {
|
|
struct work_struct work;
|
|
struct hv_message msg;
|
|
};
|
|
|
|
static void vmbus_onmessage_work(struct work_struct *work)
|
|
{
|
|
struct onmessage_work_context *ctx;
|
|
|
|
/* Do not process messages if we're in DISCONNECTED state */
|
|
if (vmbus_connection.conn_state == DISCONNECTED)
|
|
return;
|
|
|
|
ctx = container_of(work, struct onmessage_work_context,
|
|
work);
|
|
vmbus_onmessage(&ctx->msg);
|
|
kfree(ctx);
|
|
}
|
|
|
|
static void hv_process_timer_expiration(struct hv_message *msg, int cpu)
|
|
{
|
|
struct clock_event_device *dev = hv_context.clk_evt[cpu];
|
|
|
|
if (dev->event_handler)
|
|
dev->event_handler(dev);
|
|
|
|
vmbus_signal_eom(msg);
|
|
}
|
|
|
|
void vmbus_on_msg_dpc(unsigned long data)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
void *page_addr = hv_context.synic_message_page[cpu];
|
|
struct hv_message *msg = (struct hv_message *)page_addr +
|
|
VMBUS_MESSAGE_SINT;
|
|
struct vmbus_channel_message_header *hdr;
|
|
struct vmbus_channel_message_table_entry *entry;
|
|
struct onmessage_work_context *ctx;
|
|
|
|
if (msg->header.message_type == HVMSG_NONE)
|
|
/* no msg */
|
|
return;
|
|
|
|
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
|
|
|
|
if (hdr->msgtype >= CHANNELMSG_COUNT) {
|
|
WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
|
|
goto msg_handled;
|
|
}
|
|
|
|
entry = &channel_message_table[hdr->msgtype];
|
|
if (entry->handler_type == VMHT_BLOCKING) {
|
|
ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
|
|
if (ctx == NULL)
|
|
return;
|
|
|
|
INIT_WORK(&ctx->work, vmbus_onmessage_work);
|
|
memcpy(&ctx->msg, msg, sizeof(*msg));
|
|
|
|
queue_work(vmbus_connection.work_queue, &ctx->work);
|
|
} else
|
|
entry->message_handler(hdr);
|
|
|
|
msg_handled:
|
|
vmbus_signal_eom(msg);
|
|
}
|
|
|
|
static void vmbus_isr(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
void *page_addr;
|
|
struct hv_message *msg;
|
|
union hv_synic_event_flags *event;
|
|
bool handled = false;
|
|
|
|
page_addr = hv_context.synic_event_page[cpu];
|
|
if (page_addr == NULL)
|
|
return;
|
|
|
|
event = (union hv_synic_event_flags *)page_addr +
|
|
VMBUS_MESSAGE_SINT;
|
|
/*
|
|
* Check for events before checking for messages. This is the order
|
|
* in which events and messages are checked in Windows guests on
|
|
* Hyper-V, and the Windows team suggested we do the same.
|
|
*/
|
|
|
|
if ((vmbus_proto_version == VERSION_WS2008) ||
|
|
(vmbus_proto_version == VERSION_WIN7)) {
|
|
|
|
/* Since we are a child, we only need to check bit 0 */
|
|
if (sync_test_and_clear_bit(0,
|
|
(unsigned long *) &event->flags32[0])) {
|
|
handled = true;
|
|
}
|
|
} else {
|
|
/*
|
|
* Our host is win8 or above. The signaling mechanism
|
|
* has changed and we can directly look at the event page.
|
|
* If bit n is set then we have an interrup on the channel
|
|
* whose id is n.
|
|
*/
|
|
handled = true;
|
|
}
|
|
|
|
if (handled)
|
|
tasklet_schedule(hv_context.event_dpc[cpu]);
|
|
|
|
|
|
page_addr = hv_context.synic_message_page[cpu];
|
|
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
|
|
|
|
/* Check if there are actual msgs to be processed */
|
|
if (msg->header.message_type != HVMSG_NONE) {
|
|
if (msg->header.message_type == HVMSG_TIMER_EXPIRED)
|
|
hv_process_timer_expiration(msg, cpu);
|
|
else
|
|
tasklet_schedule(hv_context.msg_dpc[cpu]);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* vmbus_bus_init -Main vmbus driver initialization routine.
|
|
*
|
|
* Here, we
|
|
* - initialize the vmbus driver context
|
|
* - invoke the vmbus hv main init routine
|
|
* - retrieve the channel offers
|
|
*/
|
|
static int vmbus_bus_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* Hypervisor initialization...setup hypercall page..etc */
|
|
ret = hv_init();
|
|
if (ret != 0) {
|
|
pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = bus_register(&hv_bus);
|
|
if (ret)
|
|
goto err_cleanup;
|
|
|
|
hv_setup_vmbus_irq(vmbus_isr);
|
|
|
|
ret = hv_synic_alloc();
|
|
if (ret)
|
|
goto err_alloc;
|
|
/*
|
|
* Initialize the per-cpu interrupt state and
|
|
* connect to the host.
|
|
*/
|
|
on_each_cpu(hv_synic_init, NULL, 1);
|
|
ret = vmbus_connect();
|
|
if (ret)
|
|
goto err_connect;
|
|
|
|
if (vmbus_proto_version > VERSION_WIN7)
|
|
cpu_hotplug_disable();
|
|
|
|
/*
|
|
* Only register if the crash MSRs are available
|
|
*/
|
|
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
|
|
register_die_notifier(&hyperv_die_block);
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&hyperv_panic_block);
|
|
}
|
|
|
|
vmbus_request_offers();
|
|
|
|
return 0;
|
|
|
|
err_connect:
|
|
on_each_cpu(hv_synic_cleanup, NULL, 1);
|
|
err_alloc:
|
|
hv_synic_free();
|
|
hv_remove_vmbus_irq();
|
|
|
|
bus_unregister(&hv_bus);
|
|
|
|
err_cleanup:
|
|
hv_cleanup();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __vmbus_child_driver_register() - Register a vmbus's driver
|
|
* @hv_driver: Pointer to driver structure you want to register
|
|
* @owner: owner module of the drv
|
|
* @mod_name: module name string
|
|
*
|
|
* Registers the given driver with Linux through the 'driver_register()' call
|
|
* and sets up the hyper-v vmbus handling for this driver.
|
|
* It will return the state of the 'driver_register()' call.
|
|
*
|
|
*/
|
|
int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name)
|
|
{
|
|
int ret;
|
|
|
|
pr_info("registering driver %s\n", hv_driver->name);
|
|
|
|
ret = vmbus_exists();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
hv_driver->driver.name = hv_driver->name;
|
|
hv_driver->driver.owner = owner;
|
|
hv_driver->driver.mod_name = mod_name;
|
|
hv_driver->driver.bus = &hv_bus;
|
|
|
|
ret = driver_register(&hv_driver->driver);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__vmbus_driver_register);
|
|
|
|
/**
|
|
* vmbus_driver_unregister() - Unregister a vmbus's driver
|
|
* @hv_driver: Pointer to driver structure you want to
|
|
* un-register
|
|
*
|
|
* Un-register the given driver that was previous registered with a call to
|
|
* vmbus_driver_register()
|
|
*/
|
|
void vmbus_driver_unregister(struct hv_driver *hv_driver)
|
|
{
|
|
pr_info("unregistering driver %s\n", hv_driver->name);
|
|
|
|
if (!vmbus_exists())
|
|
driver_unregister(&hv_driver->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
|
|
|
|
/*
|
|
* vmbus_device_create - Creates and registers a new child device
|
|
* on the vmbus.
|
|
*/
|
|
struct hv_device *vmbus_device_create(const uuid_le *type,
|
|
const uuid_le *instance,
|
|
struct vmbus_channel *channel)
|
|
{
|
|
struct hv_device *child_device_obj;
|
|
|
|
child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
|
|
if (!child_device_obj) {
|
|
pr_err("Unable to allocate device object for child device\n");
|
|
return NULL;
|
|
}
|
|
|
|
child_device_obj->channel = channel;
|
|
memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le));
|
|
memcpy(&child_device_obj->dev_instance, instance,
|
|
sizeof(uuid_le));
|
|
child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */
|
|
|
|
|
|
return child_device_obj;
|
|
}
|
|
|
|
/*
|
|
* vmbus_device_register - Register the child device
|
|
*/
|
|
int vmbus_device_register(struct hv_device *child_device_obj)
|
|
{
|
|
int ret = 0;
|
|
|
|
dev_set_name(&child_device_obj->device, "vmbus_%d",
|
|
child_device_obj->channel->id);
|
|
|
|
child_device_obj->device.bus = &hv_bus;
|
|
child_device_obj->device.parent = &hv_acpi_dev->dev;
|
|
child_device_obj->device.release = vmbus_device_release;
|
|
|
|
/*
|
|
* Register with the LDM. This will kick off the driver/device
|
|
* binding...which will eventually call vmbus_match() and vmbus_probe()
|
|
*/
|
|
ret = device_register(&child_device_obj->device);
|
|
|
|
if (ret)
|
|
pr_err("Unable to register child device\n");
|
|
else
|
|
pr_debug("child device %s registered\n",
|
|
dev_name(&child_device_obj->device));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* vmbus_device_unregister - Remove the specified child device
|
|
* from the vmbus.
|
|
*/
|
|
void vmbus_device_unregister(struct hv_device *device_obj)
|
|
{
|
|
pr_debug("child device %s unregistered\n",
|
|
dev_name(&device_obj->device));
|
|
|
|
/*
|
|
* Kick off the process of unregistering the device.
|
|
* This will call vmbus_remove() and eventually vmbus_device_release()
|
|
*/
|
|
device_unregister(&device_obj->device);
|
|
}
|
|
|
|
|
|
/*
|
|
* VMBUS is an acpi enumerated device. Get the information we
|
|
* need from DSDT.
|
|
*/
|
|
#define VTPM_BASE_ADDRESS 0xfed40000
|
|
static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
|
|
{
|
|
resource_size_t start = 0;
|
|
resource_size_t end = 0;
|
|
struct resource *new_res;
|
|
struct resource **old_res = &hyperv_mmio;
|
|
struct resource **prev_res = NULL;
|
|
|
|
switch (res->type) {
|
|
|
|
/*
|
|
* "Address" descriptors are for bus windows. Ignore
|
|
* "memory" descriptors, which are for registers on
|
|
* devices.
|
|
*/
|
|
case ACPI_RESOURCE_TYPE_ADDRESS32:
|
|
start = res->data.address32.address.minimum;
|
|
end = res->data.address32.address.maximum;
|
|
break;
|
|
|
|
case ACPI_RESOURCE_TYPE_ADDRESS64:
|
|
start = res->data.address64.address.minimum;
|
|
end = res->data.address64.address.maximum;
|
|
break;
|
|
|
|
default:
|
|
/* Unused resource type */
|
|
return AE_OK;
|
|
|
|
}
|
|
/*
|
|
* Ignore ranges that are below 1MB, as they're not
|
|
* necessary or useful here.
|
|
*/
|
|
if (end < 0x100000)
|
|
return AE_OK;
|
|
|
|
new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC);
|
|
if (!new_res)
|
|
return AE_NO_MEMORY;
|
|
|
|
/* If this range overlaps the virtual TPM, truncate it. */
|
|
if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS)
|
|
end = VTPM_BASE_ADDRESS;
|
|
|
|
new_res->name = "hyperv mmio";
|
|
new_res->flags = IORESOURCE_MEM;
|
|
new_res->start = start;
|
|
new_res->end = end;
|
|
|
|
/*
|
|
* Stick ranges from higher in address space at the front of the list.
|
|
* If two ranges are adjacent, merge them.
|
|
*/
|
|
do {
|
|
if (!*old_res) {
|
|
*old_res = new_res;
|
|
break;
|
|
}
|
|
|
|
if (((*old_res)->end + 1) == new_res->start) {
|
|
(*old_res)->end = new_res->end;
|
|
kfree(new_res);
|
|
break;
|
|
}
|
|
|
|
if ((*old_res)->start == new_res->end + 1) {
|
|
(*old_res)->start = new_res->start;
|
|
kfree(new_res);
|
|
break;
|
|
}
|
|
|
|
if ((*old_res)->end < new_res->start) {
|
|
new_res->sibling = *old_res;
|
|
if (prev_res)
|
|
(*prev_res)->sibling = new_res;
|
|
*old_res = new_res;
|
|
break;
|
|
}
|
|
|
|
prev_res = old_res;
|
|
old_res = &(*old_res)->sibling;
|
|
|
|
} while (1);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int vmbus_acpi_remove(struct acpi_device *device)
|
|
{
|
|
struct resource *cur_res;
|
|
struct resource *next_res;
|
|
|
|
if (hyperv_mmio) {
|
|
for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) {
|
|
next_res = cur_res->sibling;
|
|
kfree(cur_res);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vmbus_allocate_mmio() - Pick a memory-mapped I/O range.
|
|
* @new: If successful, supplied a pointer to the
|
|
* allocated MMIO space.
|
|
* @device_obj: Identifies the caller
|
|
* @min: Minimum guest physical address of the
|
|
* allocation
|
|
* @max: Maximum guest physical address
|
|
* @size: Size of the range to be allocated
|
|
* @align: Alignment of the range to be allocated
|
|
* @fb_overlap_ok: Whether this allocation can be allowed
|
|
* to overlap the video frame buffer.
|
|
*
|
|
* This function walks the resources granted to VMBus by the
|
|
* _CRS object in the ACPI namespace underneath the parent
|
|
* "bridge" whether that's a root PCI bus in the Generation 1
|
|
* case or a Module Device in the Generation 2 case. It then
|
|
* attempts to allocate from the global MMIO pool in a way that
|
|
* matches the constraints supplied in these parameters and by
|
|
* that _CRS.
|
|
*
|
|
* Return: 0 on success, -errno on failure
|
|
*/
|
|
int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
|
|
resource_size_t min, resource_size_t max,
|
|
resource_size_t size, resource_size_t align,
|
|
bool fb_overlap_ok)
|
|
{
|
|
struct resource *iter;
|
|
resource_size_t range_min, range_max, start, local_min, local_max;
|
|
const char *dev_n = dev_name(&device_obj->device);
|
|
u32 fb_end = screen_info.lfb_base + (screen_info.lfb_size << 1);
|
|
int i;
|
|
|
|
for (iter = hyperv_mmio; iter; iter = iter->sibling) {
|
|
if ((iter->start >= max) || (iter->end <= min))
|
|
continue;
|
|
|
|
range_min = iter->start;
|
|
range_max = iter->end;
|
|
|
|
/* If this range overlaps the frame buffer, split it into
|
|
two tries. */
|
|
for (i = 0; i < 2; i++) {
|
|
local_min = range_min;
|
|
local_max = range_max;
|
|
if (fb_overlap_ok || (range_min >= fb_end) ||
|
|
(range_max <= screen_info.lfb_base)) {
|
|
i++;
|
|
} else {
|
|
if ((range_min <= screen_info.lfb_base) &&
|
|
(range_max >= screen_info.lfb_base)) {
|
|
/*
|
|
* The frame buffer is in this window,
|
|
* so trim this into the part that
|
|
* preceeds the frame buffer.
|
|
*/
|
|
local_max = screen_info.lfb_base - 1;
|
|
range_min = fb_end;
|
|
} else {
|
|
range_min = fb_end;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
start = (local_min + align - 1) & ~(align - 1);
|
|
for (; start + size - 1 <= local_max; start += align) {
|
|
*new = request_mem_region_exclusive(start, size,
|
|
dev_n);
|
|
if (*new)
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return -ENXIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
|
|
|
|
/**
|
|
* vmbus_cpu_number_to_vp_number() - Map CPU to VP.
|
|
* @cpu_number: CPU number in Linux terms
|
|
*
|
|
* This function returns the mapping between the Linux processor
|
|
* number and the hypervisor's virtual processor number, useful
|
|
* in making hypercalls and such that talk about specific
|
|
* processors.
|
|
*
|
|
* Return: Virtual processor number in Hyper-V terms
|
|
*/
|
|
int vmbus_cpu_number_to_vp_number(int cpu_number)
|
|
{
|
|
return hv_context.vp_index[cpu_number];
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
|
|
|
|
static int vmbus_acpi_add(struct acpi_device *device)
|
|
{
|
|
acpi_status result;
|
|
int ret_val = -ENODEV;
|
|
struct acpi_device *ancestor;
|
|
|
|
hv_acpi_dev = device;
|
|
|
|
result = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
|
|
vmbus_walk_resources, NULL);
|
|
|
|
if (ACPI_FAILURE(result))
|
|
goto acpi_walk_err;
|
|
/*
|
|
* Some ancestor of the vmbus acpi device (Gen1 or Gen2
|
|
* firmware) is the VMOD that has the mmio ranges. Get that.
|
|
*/
|
|
for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) {
|
|
result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
|
|
vmbus_walk_resources, NULL);
|
|
|
|
if (ACPI_FAILURE(result))
|
|
continue;
|
|
if (hyperv_mmio)
|
|
break;
|
|
}
|
|
ret_val = 0;
|
|
|
|
acpi_walk_err:
|
|
complete(&probe_event);
|
|
if (ret_val)
|
|
vmbus_acpi_remove(device);
|
|
return ret_val;
|
|
}
|
|
|
|
static const struct acpi_device_id vmbus_acpi_device_ids[] = {
|
|
{"VMBUS", 0},
|
|
{"VMBus", 0},
|
|
{"", 0},
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
|
|
|
|
static struct acpi_driver vmbus_acpi_driver = {
|
|
.name = "vmbus",
|
|
.ids = vmbus_acpi_device_ids,
|
|
.ops = {
|
|
.add = vmbus_acpi_add,
|
|
.remove = vmbus_acpi_remove,
|
|
},
|
|
};
|
|
|
|
static void hv_kexec_handler(void)
|
|
{
|
|
int cpu;
|
|
|
|
hv_synic_clockevents_cleanup();
|
|
vmbus_initiate_unload(false);
|
|
for_each_online_cpu(cpu)
|
|
smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
|
|
hv_cleanup();
|
|
};
|
|
|
|
static void hv_crash_handler(struct pt_regs *regs)
|
|
{
|
|
vmbus_initiate_unload(true);
|
|
/*
|
|
* In crash handler we can't schedule synic cleanup for all CPUs,
|
|
* doing the cleanup for current CPU only. This should be sufficient
|
|
* for kdump.
|
|
*/
|
|
hv_synic_cleanup(NULL);
|
|
hv_cleanup();
|
|
};
|
|
|
|
static int __init hv_acpi_init(void)
|
|
{
|
|
int ret, t;
|
|
|
|
if (x86_hyper != &x86_hyper_ms_hyperv)
|
|
return -ENODEV;
|
|
|
|
init_completion(&probe_event);
|
|
|
|
/*
|
|
* Get ACPI resources first.
|
|
*/
|
|
ret = acpi_bus_register_driver(&vmbus_acpi_driver);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
t = wait_for_completion_timeout(&probe_event, 5*HZ);
|
|
if (t == 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = vmbus_bus_init();
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
hv_setup_kexec_handler(hv_kexec_handler);
|
|
hv_setup_crash_handler(hv_crash_handler);
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
acpi_bus_unregister_driver(&vmbus_acpi_driver);
|
|
hv_acpi_dev = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static void __exit vmbus_exit(void)
|
|
{
|
|
int cpu;
|
|
|
|
hv_remove_kexec_handler();
|
|
hv_remove_crash_handler();
|
|
vmbus_connection.conn_state = DISCONNECTED;
|
|
hv_synic_clockevents_cleanup();
|
|
vmbus_disconnect();
|
|
hv_remove_vmbus_irq();
|
|
for_each_online_cpu(cpu)
|
|
tasklet_kill(hv_context.msg_dpc[cpu]);
|
|
vmbus_free_channels();
|
|
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
|
|
unregister_die_notifier(&hyperv_die_block);
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
|
&hyperv_panic_block);
|
|
}
|
|
bus_unregister(&hv_bus);
|
|
hv_cleanup();
|
|
for_each_online_cpu(cpu) {
|
|
tasklet_kill(hv_context.event_dpc[cpu]);
|
|
smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
|
|
}
|
|
hv_synic_free();
|
|
acpi_bus_unregister_driver(&vmbus_acpi_driver);
|
|
if (vmbus_proto_version > VERSION_WIN7)
|
|
cpu_hotplug_enable();
|
|
}
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
subsys_initcall(hv_acpi_init);
|
|
module_exit(vmbus_exit);
|