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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2009, Microsoft Corporation.
- *
- * Authors:
- * Haiyang Zhang <haiyangz@microsoft.com>
- * Hank Janssen <hjanssen@microsoft.com>
- * K. Y. Srinivasan <kys@microsoft.com>
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/device.h>
- #include <linux/interrupt.h>
- #include <linux/sysctl.h>
- #include <linux/slab.h>
- #include <linux/acpi.h>
- #include <linux/completion.h>
- #include <linux/hyperv.h>
- #include <linux/kernel_stat.h>
- #include <linux/clockchips.h>
- #include <linux/cpu.h>
- #include <linux/sched/task_stack.h>
- #include <linux/delay.h>
- #include <linux/notifier.h>
- #include <linux/ptrace.h>
- #include <linux/screen_info.h>
- #include <linux/kdebug.h>
- #include <linux/efi.h>
- #include <linux/random.h>
- #include <linux/kernel.h>
- #include <linux/syscore_ops.h>
- #include <clocksource/hyperv_timer.h>
- #include "hyperv_vmbus.h"
- struct vmbus_dynid {
- struct list_head node;
- struct hv_vmbus_device_id id;
- };
- static struct acpi_device *hv_acpi_dev;
- static struct completion probe_event;
- static int hyperv_cpuhp_online;
- static void *hv_panic_page;
- /* Values parsed from ACPI DSDT */
- static int vmbus_irq;
- int vmbus_interrupt;
- /*
- * Boolean to control whether to report panic messages over Hyper-V.
- *
- * It can be set via /proc/sys/kernel/hyperv/record_panic_msg
- */
- static int sysctl_record_panic_msg = 1;
- static int hyperv_report_reg(void)
- {
- return !sysctl_record_panic_msg || !hv_panic_page;
- }
- static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
- void *args)
- {
- struct pt_regs *regs;
- vmbus_initiate_unload(true);
- /*
- * Hyper-V should be notified only once about a panic. If we will be
- * doing hyperv_report_panic_msg() later with kmsg data, don't do
- * the notification here.
- */
- if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
- && hyperv_report_reg()) {
- regs = current_pt_regs();
- hyperv_report_panic(regs, val, false);
- }
- return NOTIFY_DONE;
- }
- static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
- void *args)
- {
- struct die_args *die = args;
- struct pt_regs *regs = die->regs;
- /* Don't notify Hyper-V if the die event is other than oops */
- if (val != DIE_OOPS)
- return NOTIFY_DONE;
- /*
- * Hyper-V should be notified only once about a panic. If we will be
- * doing hyperv_report_panic_msg() later with kmsg data, don't do
- * the notification here.
- */
- if (hyperv_report_reg())
- hyperv_report_panic(regs, val, true);
- return NOTIFY_DONE;
- }
- static struct notifier_block hyperv_die_block = {
- .notifier_call = hyperv_die_event,
- };
- static struct notifier_block hyperv_panic_block = {
- .notifier_call = hyperv_panic_event,
- };
- static const char *fb_mmio_name = "fb_range";
- static struct resource *fb_mmio;
- static struct resource *hyperv_mmio;
- static DEFINE_MUTEX(hyperv_mmio_lock);
- static int vmbus_exists(void)
- {
- if (hv_acpi_dev == NULL)
- return -ENODEV;
- return 0;
- }
- static u8 channel_monitor_group(const struct vmbus_channel *channel)
- {
- return (u8)channel->offermsg.monitorid / 32;
- }
- static u8 channel_monitor_offset(const struct vmbus_channel *channel)
- {
- return (u8)channel->offermsg.monitorid % 32;
- }
- static u32 channel_pending(const struct vmbus_channel *channel,
- const struct hv_monitor_page *monitor_page)
- {
- u8 monitor_group = channel_monitor_group(channel);
- return monitor_page->trigger_group[monitor_group].pending;
- }
- static u32 channel_latency(const struct vmbus_channel *channel,
- const struct hv_monitor_page *monitor_page)
- {
- u8 monitor_group = channel_monitor_group(channel);
- u8 monitor_offset = channel_monitor_offset(channel);
- return monitor_page->latency[monitor_group][monitor_offset];
- }
- static u32 channel_conn_id(struct vmbus_channel *channel,
- struct hv_monitor_page *monitor_page)
- {
- u8 monitor_group = channel_monitor_group(channel);
- u8 monitor_offset = channel_monitor_offset(channel);
- return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id;
- }
- static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
- }
- static DEVICE_ATTR_RO(id);
- static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n", hv_dev->channel->state);
- }
- static DEVICE_ATTR_RO(state);
- static ssize_t monitor_id_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
- }
- static DEVICE_ATTR_RO(monitor_id);
- static ssize_t class_id_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "{%pUl}\n",
- &hv_dev->channel->offermsg.offer.if_type);
- }
- static DEVICE_ATTR_RO(class_id);
- static ssize_t device_id_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "{%pUl}\n",
- &hv_dev->channel->offermsg.offer.if_instance);
- }
- static DEVICE_ATTR_RO(device_id);
- static ssize_t modalias_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- return sprintf(buf, "vmbus:%*phN\n", UUID_SIZE, &hv_dev->dev_type);
- }
- static DEVICE_ATTR_RO(modalias);
- #ifdef CONFIG_NUMA
- static ssize_t numa_node_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n", cpu_to_node(hv_dev->channel->target_cpu));
- }
- static DEVICE_ATTR_RO(numa_node);
- #endif
- static ssize_t server_monitor_pending_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- channel_pending(hv_dev->channel,
- vmbus_connection.monitor_pages[0]));
- }
- static DEVICE_ATTR_RO(server_monitor_pending);
- static ssize_t client_monitor_pending_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- channel_pending(hv_dev->channel,
- vmbus_connection.monitor_pages[1]));
- }
- static DEVICE_ATTR_RO(client_monitor_pending);
- static ssize_t server_monitor_latency_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- channel_latency(hv_dev->channel,
- vmbus_connection.monitor_pages[0]));
- }
- static DEVICE_ATTR_RO(server_monitor_latency);
- static ssize_t client_monitor_latency_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- channel_latency(hv_dev->channel,
- vmbus_connection.monitor_pages[1]));
- }
- static DEVICE_ATTR_RO(client_monitor_latency);
- static ssize_t server_monitor_conn_id_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- channel_conn_id(hv_dev->channel,
- vmbus_connection.monitor_pages[0]));
- }
- static DEVICE_ATTR_RO(server_monitor_conn_id);
- static ssize_t client_monitor_conn_id_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- if (!hv_dev->channel)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- channel_conn_id(hv_dev->channel,
- vmbus_connection.monitor_pages[1]));
- }
- static DEVICE_ATTR_RO(client_monitor_conn_id);
- static ssize_t out_intr_mask_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info outbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound,
- &outbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", outbound.current_interrupt_mask);
- }
- static DEVICE_ATTR_RO(out_intr_mask);
- static ssize_t out_read_index_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info outbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound,
- &outbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", outbound.current_read_index);
- }
- static DEVICE_ATTR_RO(out_read_index);
- static ssize_t out_write_index_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info outbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound,
- &outbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", outbound.current_write_index);
- }
- static DEVICE_ATTR_RO(out_write_index);
- static ssize_t out_read_bytes_avail_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info outbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound,
- &outbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", outbound.bytes_avail_toread);
- }
- static DEVICE_ATTR_RO(out_read_bytes_avail);
- static ssize_t out_write_bytes_avail_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info outbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound,
- &outbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);
- }
- static DEVICE_ATTR_RO(out_write_bytes_avail);
- static ssize_t in_intr_mask_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info inbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", inbound.current_interrupt_mask);
- }
- static DEVICE_ATTR_RO(in_intr_mask);
- static ssize_t in_read_index_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info inbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", inbound.current_read_index);
- }
- static DEVICE_ATTR_RO(in_read_index);
- static ssize_t in_write_index_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info inbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", inbound.current_write_index);
- }
- static DEVICE_ATTR_RO(in_write_index);
- static ssize_t in_read_bytes_avail_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info inbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", inbound.bytes_avail_toread);
- }
- static DEVICE_ATTR_RO(in_read_bytes_avail);
- static ssize_t in_write_bytes_avail_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct hv_ring_buffer_debug_info inbound;
- int ret;
- if (!hv_dev->channel)
- return -ENODEV;
- ret = hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);
- }
- static DEVICE_ATTR_RO(in_write_bytes_avail);
- static ssize_t channel_vp_mapping_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- struct vmbus_channel *channel = hv_dev->channel, *cur_sc;
- int buf_size = PAGE_SIZE, n_written, tot_written;
- struct list_head *cur;
- if (!channel)
- return -ENODEV;
- mutex_lock(&vmbus_connection.channel_mutex);
- tot_written = snprintf(buf, buf_size, "%u:%u\n",
- channel->offermsg.child_relid, channel->target_cpu);
- list_for_each(cur, &channel->sc_list) {
- if (tot_written >= buf_size - 1)
- break;
- cur_sc = list_entry(cur, struct vmbus_channel, sc_list);
- n_written = scnprintf(buf + tot_written,
- buf_size - tot_written,
- "%u:%u\n",
- cur_sc->offermsg.child_relid,
- cur_sc->target_cpu);
- tot_written += n_written;
- }
- mutex_unlock(&vmbus_connection.channel_mutex);
- return tot_written;
- }
- 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);
- static ssize_t driver_override_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- char *driver_override, *old, *cp;
- /* We need to keep extra room for a newline */
- if (count >= (PAGE_SIZE - 1))
- return -EINVAL;
- driver_override = kstrndup(buf, count, GFP_KERNEL);
- if (!driver_override)
- return -ENOMEM;
- cp = strchr(driver_override, '\n');
- if (cp)
- *cp = '\0';
- device_lock(dev);
- old = hv_dev->driver_override;
- if (strlen(driver_override)) {
- hv_dev->driver_override = driver_override;
- } else {
- kfree(driver_override);
- hv_dev->driver_override = NULL;
- }
- device_unlock(dev);
- kfree(old);
- return count;
- }
- static ssize_t driver_override_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct hv_device *hv_dev = device_to_hv_device(dev);
- ssize_t len;
- device_lock(dev);
- len = snprintf(buf, PAGE_SIZE, "%s\n", hv_dev->driver_override);
- device_unlock(dev);
- return len;
- }
- static DEVICE_ATTR_RW(driver_override);
- /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
- static struct attribute *vmbus_dev_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,
- #ifdef CONFIG_NUMA
- &dev_attr_numa_node.attr,
- #endif
- &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,
- &dev_attr_driver_override.attr,
- NULL,
- };
- /*
- * Device-level attribute_group callback function. Returns the permission for
- * each attribute, and returns 0 if an attribute is not visible.
- */
- static umode_t vmbus_dev_attr_is_visible(struct kobject *kobj,
- struct attribute *attr, int idx)
- {
- struct device *dev = kobj_to_dev(kobj);
- const struct hv_device *hv_dev = device_to_hv_device(dev);
- /* Hide the monitor attributes if the monitor mechanism is not used. */
- if (!hv_dev->channel->offermsg.monitor_allocated &&
- (attr == &dev_attr_monitor_id.attr ||
- attr == &dev_attr_server_monitor_pending.attr ||
- attr == &dev_attr_client_monitor_pending.attr ||
- attr == &dev_attr_server_monitor_latency.attr ||
- attr == &dev_attr_client_monitor_latency.attr ||
- attr == &dev_attr_server_monitor_conn_id.attr ||
- attr == &dev_attr_client_monitor_conn_id.attr))
- return 0;
- return attr->mode;
- }
- static const struct attribute_group vmbus_dev_group = {
- .attrs = vmbus_dev_attrs,
- .is_visible = vmbus_dev_attr_is_visible
- };
- __ATTRIBUTE_GROUPS(vmbus_dev);
- /*
- * 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);
- const char *format = "MODALIAS=vmbus:%*phN";
- return add_uevent_var(env, format, UUID_SIZE, &dev->dev_type);
- }
- static const struct hv_vmbus_device_id *
- hv_vmbus_dev_match(const struct hv_vmbus_device_id *id, const guid_t *guid)
- {
- if (id == NULL)
- return NULL; /* empty device table */
- for (; !guid_is_null(&id->guid); id++)
- if (guid_equal(&id->guid, guid))
- return id;
- return NULL;
- }
- static const struct hv_vmbus_device_id *
- hv_vmbus_dynid_match(struct hv_driver *drv, const guid_t *guid)
- {
- const struct hv_vmbus_device_id *id = NULL;
- struct vmbus_dynid *dynid;
- spin_lock(&drv->dynids.lock);
- list_for_each_entry(dynid, &drv->dynids.list, node) {
- if (guid_equal(&dynid->id.guid, guid)) {
- id = &dynid->id;
- break;
- }
- }
- spin_unlock(&drv->dynids.lock);
- return id;
- }
- static const struct hv_vmbus_device_id vmbus_device_null;
- /*
- * 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(struct hv_driver *drv,
- struct hv_device *dev)
- {
- const guid_t *guid = &dev->dev_type;
- const struct hv_vmbus_device_id *id;
- /* When driver_override is set, only bind to the matching driver */
- if (dev->driver_override && strcmp(dev->driver_override, drv->name))
- return NULL;
- /* Look at the dynamic ids first, before the static ones */
- id = hv_vmbus_dynid_match(drv, guid);
- if (!id)
- id = hv_vmbus_dev_match(drv->id_table, guid);
- /* driver_override will always match, send a dummy id */
- if (!id && dev->driver_override)
- id = &vmbus_device_null;
- return id;
- }
- /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */
- static int vmbus_add_dynid(struct hv_driver *drv, guid_t *guid)
- {
- struct vmbus_dynid *dynid;
- dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
- if (!dynid)
- return -ENOMEM;
- dynid->id.guid = *guid;
- spin_lock(&drv->dynids.lock);
- list_add_tail(&dynid->node, &drv->dynids.list);
- spin_unlock(&drv->dynids.lock);
- return driver_attach(&drv->driver);
- }
- static void vmbus_free_dynids(struct hv_driver *drv)
- {
- struct vmbus_dynid *dynid, *n;
- spin_lock(&drv->dynids.lock);
- list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
- list_del(&dynid->node);
- kfree(dynid);
- }
- spin_unlock(&drv->dynids.lock);
- }
- /*
- * store_new_id - sysfs frontend to vmbus_add_dynid()
- *
- * Allow GUIDs to be added to an existing driver via sysfs.
- */
- static ssize_t new_id_store(struct device_driver *driver, const char *buf,
- size_t count)
- {
- struct hv_driver *drv = drv_to_hv_drv(driver);
- guid_t guid;
- ssize_t retval;
- retval = guid_parse(buf, &guid);
- if (retval)
- return retval;
- if (hv_vmbus_dynid_match(drv, &guid))
- return -EEXIST;
- retval = vmbus_add_dynid(drv, &guid);
- if (retval)
- return retval;
- return count;
- }
- static DRIVER_ATTR_WO(new_id);
- /*
- * store_remove_id - remove a PCI device ID from this driver
- *
- * Removes a dynamic pci device ID to this driver.
- */
- static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
- size_t count)
- {
- struct hv_driver *drv = drv_to_hv_drv(driver);
- struct vmbus_dynid *dynid, *n;
- guid_t guid;
- ssize_t retval;
- retval = guid_parse(buf, &guid);
- if (retval)
- return retval;
- retval = -ENODEV;
- spin_lock(&drv->dynids.lock);
- list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
- struct hv_vmbus_device_id *id = &dynid->id;
- if (guid_equal(&id->guid, &guid)) {
- list_del(&dynid->node);
- kfree(dynid);
- retval = count;
- break;
- }
- }
- spin_unlock(&drv->dynids.lock);
- return retval;
- }
- static DRIVER_ATTR_WO(remove_id);
- static struct attribute *vmbus_drv_attrs[] = {
- &driver_attr_new_id.attr,
- &driver_attr_remove_id.attr,
- NULL,
- };
- ATTRIBUTE_GROUPS(vmbus_drv);
- /*
- * 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, hv_dev))
- 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, dev);
- 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);
- }
- #ifdef CONFIG_PM_SLEEP
- /*
- * vmbus_suspend - Suspend a vmbus device
- */
- static int vmbus_suspend(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 0;
- drv = drv_to_hv_drv(child_device->driver);
- if (!drv->suspend)
- return -EOPNOTSUPP;
- return drv->suspend(dev);
- }
- /*
- * vmbus_resume - Resume a vmbus device
- */
- static int vmbus_resume(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 0;
- drv = drv_to_hv_drv(child_device->driver);
- if (!drv->resume)
- return -EOPNOTSUPP;
- return drv->resume(dev);
- }
- #else
- #define vmbus_suspend NULL
- #define vmbus_resume NULL
- #endif /* CONFIG_PM_SLEEP */
- /*
- * 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_debug_rm_dev_dir(hv_dev);
- mutex_lock(&vmbus_connection.channel_mutex);
- hv_process_channel_removal(channel);
- mutex_unlock(&vmbus_connection.channel_mutex);
- kfree(hv_dev);
- }
- /*
- * Note: we must use the "noirq" ops: see the comment before vmbus_bus_pm.
- *
- * suspend_noirq/resume_noirq are set to NULL to support Suspend-to-Idle: we
- * shouldn't suspend the vmbus devices upon Suspend-to-Idle, otherwise there
- * is no way to wake up a Generation-2 VM.
- *
- * The other 4 ops are for hibernation.
- */
- static const struct dev_pm_ops vmbus_pm = {
- .suspend_noirq = NULL,
- .resume_noirq = NULL,
- .freeze_noirq = vmbus_suspend,
- .thaw_noirq = vmbus_resume,
- .poweroff_noirq = vmbus_suspend,
- .restore_noirq = vmbus_resume,
- };
- /* 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_dev_groups,
- .drv_groups = vmbus_drv_groups,
- .pm = &vmbus_pm,
- };
- struct onmessage_work_context {
- struct work_struct work;
- struct {
- struct hv_message_header header;
- u8 payload[];
- } 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((struct vmbus_channel_message_header *)
- &ctx->msg.payload);
- kfree(ctx);
- }
- void vmbus_on_msg_dpc(unsigned long data)
- {
- struct hv_per_cpu_context *hv_cpu = (void *)data;
- void *page_addr = hv_cpu->synic_message_page;
- struct hv_message *msg = (struct hv_message *)page_addr +
- VMBUS_MESSAGE_SINT;
- struct vmbus_channel_message_header *hdr;
- const struct vmbus_channel_message_table_entry *entry;
- struct onmessage_work_context *ctx;
- u32 message_type = msg->header.message_type;
- /*
- * 'enum vmbus_channel_message_type' is supposed to always be 'u32' as
- * it is being used in 'struct vmbus_channel_message_header' definition
- * which is supposed to match hypervisor ABI.
- */
- BUILD_BUG_ON(sizeof(enum vmbus_channel_message_type) != sizeof(u32));
- if (message_type == HVMSG_NONE)
- /* no msg */
- return;
- hdr = (struct vmbus_channel_message_header *)msg->u.payload;
- trace_vmbus_on_msg_dpc(hdr);
- if (hdr->msgtype >= CHANNELMSG_COUNT) {
- WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
- goto msg_handled;
- }
- if (msg->header.payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) {
- WARN_ONCE(1, "payload size is too large (%d)\n",
- msg->header.payload_size);
- goto msg_handled;
- }
- entry = &channel_message_table[hdr->msgtype];
- if (!entry->message_handler)
- goto msg_handled;
- if (msg->header.payload_size < entry->min_payload_len) {
- WARN_ONCE(1, "message too short: msgtype=%d len=%d\n",
- hdr->msgtype, msg->header.payload_size);
- goto msg_handled;
- }
- if (entry->handler_type == VMHT_BLOCKING) {
- ctx = kmalloc(sizeof(*ctx) + msg->header.payload_size,
- GFP_ATOMIC);
- if (ctx == NULL)
- return;
- INIT_WORK(&ctx->work, vmbus_onmessage_work);
- memcpy(&ctx->msg, msg, sizeof(msg->header) +
- msg->header.payload_size);
- /*
- * The host can generate a rescind message while we
- * may still be handling the original offer. We deal with
- * this condition by relying on the synchronization provided
- * by offer_in_progress and by channel_mutex. See also the
- * inline comments in vmbus_onoffer_rescind().
- */
- switch (hdr->msgtype) {
- case CHANNELMSG_RESCIND_CHANNELOFFER:
- /*
- * If we are handling the rescind message;
- * schedule the work on the global work queue.
- *
- * The OFFER message and the RESCIND message should
- * not be handled by the same serialized work queue,
- * because the OFFER handler may call vmbus_open(),
- * which tries to open the channel by sending an
- * OPEN_CHANNEL message to the host and waits for
- * the host's response; however, if the host has
- * rescinded the channel before it receives the
- * OPEN_CHANNEL message, the host just silently
- * ignores the OPEN_CHANNEL message; as a result,
- * the guest's OFFER handler hangs for ever, if we
- * handle the RESCIND message in the same serialized
- * work queue: the RESCIND handler can not start to
- * run before the OFFER handler finishes.
- */
- schedule_work(&ctx->work);
- break;
- case CHANNELMSG_OFFERCHANNEL:
- /*
- * The host sends the offer message of a given channel
- * before sending the rescind message of the same
- * channel. These messages are sent to the guest's
- * connect CPU; the guest then starts processing them
- * in the tasklet handler on this CPU:
- *
- * VMBUS_CONNECT_CPU
- *
- * [vmbus_on_msg_dpc()]
- * atomic_inc() // CHANNELMSG_OFFERCHANNEL
- * queue_work()
- * ...
- * [vmbus_on_msg_dpc()]
- * schedule_work() // CHANNELMSG_RESCIND_CHANNELOFFER
- *
- * We rely on the memory-ordering properties of the
- * queue_work() and schedule_work() primitives, which
- * guarantee that the atomic increment will be visible
- * to the CPUs which will execute the offer & rescind
- * works by the time these works will start execution.
- */
- atomic_inc(&vmbus_connection.offer_in_progress);
- fallthrough;
- default:
- queue_work(vmbus_connection.work_queue, &ctx->work);
- }
- } else
- entry->message_handler(hdr);
- msg_handled:
- vmbus_signal_eom(msg, message_type);
- }
- #ifdef CONFIG_PM_SLEEP
- /*
- * Fake RESCIND_CHANNEL messages to clean up hv_sock channels by force for
- * hibernation, because hv_sock connections can not persist across hibernation.
- */
- static void vmbus_force_channel_rescinded(struct vmbus_channel *channel)
- {
- struct onmessage_work_context *ctx;
- struct vmbus_channel_rescind_offer *rescind;
- WARN_ON(!is_hvsock_channel(channel));
- /*
- * Allocation size is small and the allocation should really not fail,
- * otherwise the state of the hv_sock connections ends up in limbo.
- */
- ctx = kzalloc(sizeof(*ctx) + sizeof(*rescind),
- GFP_KERNEL | __GFP_NOFAIL);
- /*
- * So far, these are not really used by Linux. Just set them to the
- * reasonable values conforming to the definitions of the fields.
- */
- ctx->msg.header.message_type = 1;
- ctx->msg.header.payload_size = sizeof(*rescind);
- /* These values are actually used by Linux. */
- rescind = (struct vmbus_channel_rescind_offer *)ctx->msg.payload;
- rescind->header.msgtype = CHANNELMSG_RESCIND_CHANNELOFFER;
- rescind->child_relid = channel->offermsg.child_relid;
- INIT_WORK(&ctx->work, vmbus_onmessage_work);
- queue_work(vmbus_connection.work_queue, &ctx->work);
- }
- #endif /* CONFIG_PM_SLEEP */
- /*
- * Schedule all channels with events pending
- */
- static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu)
- {
- unsigned long *recv_int_page;
- u32 maxbits, relid;
- if (vmbus_proto_version < VERSION_WIN8) {
- maxbits = MAX_NUM_CHANNELS_SUPPORTED;
- recv_int_page = vmbus_connection.recv_int_page;
- } else {
- /*
- * When the host is win8 and beyond, the event page
- * can be directly checked to get the id of the channel
- * that has the interrupt pending.
- */
- void *page_addr = hv_cpu->synic_event_page;
- union hv_synic_event_flags *event
- = (union hv_synic_event_flags *)page_addr +
- VMBUS_MESSAGE_SINT;
- maxbits = HV_EVENT_FLAGS_COUNT;
- recv_int_page = event->flags;
- }
- if (unlikely(!recv_int_page))
- return;
- for_each_set_bit(relid, recv_int_page, maxbits) {
- void (*callback_fn)(void *context);
- struct vmbus_channel *channel;
- if (!sync_test_and_clear_bit(relid, recv_int_page))
- continue;
- /* Special case - vmbus channel protocol msg */
- if (relid == 0)
- continue;
- /*
- * Pairs with the kfree_rcu() in vmbus_chan_release().
- * Guarantees that the channel data structure doesn't
- * get freed while the channel pointer below is being
- * dereferenced.
- */
- rcu_read_lock();
- /* Find channel based on relid */
- channel = relid2channel(relid);
- if (channel == NULL)
- goto sched_unlock_rcu;
- if (channel->rescind)
- goto sched_unlock_rcu;
- /*
- * Make sure that the ring buffer data structure doesn't get
- * freed while we dereference the ring buffer pointer. Test
- * for the channel's onchannel_callback being NULL within a
- * sched_lock critical section. See also the inline comments
- * in vmbus_reset_channel_cb().
- */
- spin_lock(&channel->sched_lock);
- callback_fn = channel->onchannel_callback;
- if (unlikely(callback_fn == NULL))
- goto sched_unlock;
- trace_vmbus_chan_sched(channel);
- ++channel->interrupts;
- switch (channel->callback_mode) {
- case HV_CALL_ISR:
- (*callback_fn)(channel->channel_callback_context);
- break;
- case HV_CALL_BATCHED:
- hv_begin_read(&channel->inbound);
- fallthrough;
- case HV_CALL_DIRECT:
- tasklet_schedule(&channel->callback_event);
- }
- sched_unlock:
- spin_unlock(&channel->sched_lock);
- sched_unlock_rcu:
- rcu_read_unlock();
- }
- }
- static void vmbus_isr(void)
- {
- struct hv_per_cpu_context *hv_cpu
- = this_cpu_ptr(hv_context.cpu_context);
- void *page_addr = hv_cpu->synic_event_page;
- struct hv_message *msg;
- union hv_synic_event_flags *event;
- bool handled = false;
- if (unlikely(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, event->flags))
- 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)
- vmbus_chan_sched(hv_cpu);
- page_addr = hv_cpu->synic_message_page;
- 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_stimer0_isr();
- vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED);
- } else
- tasklet_schedule(&hv_cpu->msg_dpc);
- }
- add_interrupt_randomness(hv_get_vector(), 0);
- }
- /*
- * Callback from kmsg_dump. Grab as much as possible from the end of the kmsg
- * buffer and call into Hyper-V to transfer the data.
- */
- static void hv_kmsg_dump(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason)
- {
- size_t bytes_written;
- phys_addr_t panic_pa;
- /* We are only interested in panics. */
- if ((reason != KMSG_DUMP_PANIC) || (!sysctl_record_panic_msg))
- return;
- panic_pa = virt_to_phys(hv_panic_page);
- /*
- * Write dump contents to the page. No need to synchronize; panic should
- * be single-threaded.
- */
- kmsg_dump_get_buffer(dumper, false, hv_panic_page, HV_HYP_PAGE_SIZE,
- &bytes_written);
- if (bytes_written)
- hyperv_report_panic_msg(panic_pa, bytes_written);
- }
- static struct kmsg_dumper hv_kmsg_dumper = {
- .dump = hv_kmsg_dump,
- };
- static struct ctl_table_header *hv_ctl_table_hdr;
- /*
- * sysctl option to allow the user to control whether kmsg data should be
- * reported to Hyper-V on panic.
- */
- static struct ctl_table hv_ctl_table[] = {
- {
- .procname = "hyperv_record_panic_msg",
- .data = &sysctl_record_panic_msg,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE
- },
- {}
- };
- static struct ctl_table hv_root_table[] = {
- {
- .procname = "kernel",
- .mode = 0555,
- .child = hv_ctl_table
- },
- {}
- };
- /*
- * 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;
- 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)
- return ret;
- ret = hv_setup_vmbus_irq(vmbus_irq, vmbus_isr);
- if (ret)
- goto err_setup;
- ret = hv_synic_alloc();
- if (ret)
- goto err_alloc;
- /*
- * Initialize the per-cpu interrupt state and stimer state.
- * Then connect to the host.
- */
- ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hyperv/vmbus:online",
- hv_synic_init, hv_synic_cleanup);
- if (ret < 0)
- goto err_cpuhp;
- hyperv_cpuhp_online = ret;
- ret = vmbus_connect();
- if (ret)
- goto err_connect;
- /*
- * Only register if the crash MSRs are available
- */
- if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
- u64 hyperv_crash_ctl;
- /*
- * Sysctl registration is not fatal, since by default
- * reporting is enabled.
- */
- hv_ctl_table_hdr = register_sysctl_table(hv_root_table);
- if (!hv_ctl_table_hdr)
- pr_err("Hyper-V: sysctl table register error");
- /*
- * Register for panic kmsg callback only if the right
- * capability is supported by the hypervisor.
- */
- hv_get_crash_ctl(hyperv_crash_ctl);
- if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG) {
- hv_panic_page = (void *)hv_alloc_hyperv_zeroed_page();
- if (hv_panic_page) {
- ret = kmsg_dump_register(&hv_kmsg_dumper);
- if (ret) {
- pr_err("Hyper-V: kmsg dump register "
- "error 0x%x\n", ret);
- hv_free_hyperv_page(
- (unsigned long)hv_panic_page);
- hv_panic_page = NULL;
- }
- } else
- pr_err("Hyper-V: panic message page memory "
- "allocation failed");
- }
- register_die_notifier(&hyperv_die_block);
- }
- /*
- * Always register the panic notifier because we need to unload
- * the VMbus channel connection to prevent any VMbus
- * activity after the VM panics.
- */
- atomic_notifier_chain_register(&panic_notifier_list,
- &hyperv_panic_block);
- vmbus_request_offers();
- return 0;
- err_connect:
- cpuhp_remove_state(hyperv_cpuhp_online);
- err_cpuhp:
- hv_synic_free();
- err_alloc:
- hv_remove_vmbus_irq();
- err_setup:
- bus_unregister(&hv_bus);
- unregister_sysctl_table(hv_ctl_table_hdr);
- hv_ctl_table_hdr = NULL;
- 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;
- spin_lock_init(&hv_driver->dynids.lock);
- INIT_LIST_HEAD(&hv_driver->dynids.list);
- 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);
- vmbus_free_dynids(hv_driver);
- }
- }
- EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
- /*
- * Called when last reference to channel is gone.
- */
- static void vmbus_chan_release(struct kobject *kobj)
- {
- struct vmbus_channel *channel
- = container_of(kobj, struct vmbus_channel, kobj);
- kfree_rcu(channel, rcu);
- }
- struct vmbus_chan_attribute {
- struct attribute attr;
- ssize_t (*show)(struct vmbus_channel *chan, char *buf);
- ssize_t (*store)(struct vmbus_channel *chan,
- const char *buf, size_t count);
- };
- #define VMBUS_CHAN_ATTR(_name, _mode, _show, _store) \
- struct vmbus_chan_attribute chan_attr_##_name \
- = __ATTR(_name, _mode, _show, _store)
- #define VMBUS_CHAN_ATTR_RW(_name) \
- struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RW(_name)
- #define VMBUS_CHAN_ATTR_RO(_name) \
- struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RO(_name)
- #define VMBUS_CHAN_ATTR_WO(_name) \
- struct vmbus_chan_attribute chan_attr_##_name = __ATTR_WO(_name)
- static ssize_t vmbus_chan_attr_show(struct kobject *kobj,
- struct attribute *attr, char *buf)
- {
- const struct vmbus_chan_attribute *attribute
- = container_of(attr, struct vmbus_chan_attribute, attr);
- struct vmbus_channel *chan
- = container_of(kobj, struct vmbus_channel, kobj);
- if (!attribute->show)
- return -EIO;
- return attribute->show(chan, buf);
- }
- static ssize_t vmbus_chan_attr_store(struct kobject *kobj,
- struct attribute *attr, const char *buf,
- size_t count)
- {
- const struct vmbus_chan_attribute *attribute
- = container_of(attr, struct vmbus_chan_attribute, attr);
- struct vmbus_channel *chan
- = container_of(kobj, struct vmbus_channel, kobj);
- if (!attribute->store)
- return -EIO;
- return attribute->store(chan, buf, count);
- }
- static const struct sysfs_ops vmbus_chan_sysfs_ops = {
- .show = vmbus_chan_attr_show,
- .store = vmbus_chan_attr_store,
- };
- static ssize_t out_mask_show(struct vmbus_channel *channel, char *buf)
- {
- struct hv_ring_buffer_info *rbi = &channel->outbound;
- ssize_t ret;
- mutex_lock(&rbi->ring_buffer_mutex);
- if (!rbi->ring_buffer) {
- mutex_unlock(&rbi->ring_buffer_mutex);
- return -EINVAL;
- }
- ret = sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
- mutex_unlock(&rbi->ring_buffer_mutex);
- return ret;
- }
- static VMBUS_CHAN_ATTR_RO(out_mask);
- static ssize_t in_mask_show(struct vmbus_channel *channel, char *buf)
- {
- struct hv_ring_buffer_info *rbi = &channel->inbound;
- ssize_t ret;
- mutex_lock(&rbi->ring_buffer_mutex);
- if (!rbi->ring_buffer) {
- mutex_unlock(&rbi->ring_buffer_mutex);
- return -EINVAL;
- }
- ret = sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
- mutex_unlock(&rbi->ring_buffer_mutex);
- return ret;
- }
- static VMBUS_CHAN_ATTR_RO(in_mask);
- static ssize_t read_avail_show(struct vmbus_channel *channel, char *buf)
- {
- struct hv_ring_buffer_info *rbi = &channel->inbound;
- ssize_t ret;
- mutex_lock(&rbi->ring_buffer_mutex);
- if (!rbi->ring_buffer) {
- mutex_unlock(&rbi->ring_buffer_mutex);
- return -EINVAL;
- }
- ret = sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi));
- mutex_unlock(&rbi->ring_buffer_mutex);
- return ret;
- }
- static VMBUS_CHAN_ATTR_RO(read_avail);
- static ssize_t write_avail_show(struct vmbus_channel *channel, char *buf)
- {
- struct hv_ring_buffer_info *rbi = &channel->outbound;
- ssize_t ret;
- mutex_lock(&rbi->ring_buffer_mutex);
- if (!rbi->ring_buffer) {
- mutex_unlock(&rbi->ring_buffer_mutex);
- return -EINVAL;
- }
- ret = sprintf(buf, "%u\n", hv_get_bytes_to_write(rbi));
- mutex_unlock(&rbi->ring_buffer_mutex);
- return ret;
- }
- static VMBUS_CHAN_ATTR_RO(write_avail);
- static ssize_t target_cpu_show(struct vmbus_channel *channel, char *buf)
- {
- return sprintf(buf, "%u\n", channel->target_cpu);
- }
- static ssize_t target_cpu_store(struct vmbus_channel *channel,
- const char *buf, size_t count)
- {
- u32 target_cpu, origin_cpu;
- ssize_t ret = count;
- if (vmbus_proto_version < VERSION_WIN10_V4_1)
- return -EIO;
- if (sscanf(buf, "%uu", &target_cpu) != 1)
- return -EIO;
- /* Validate target_cpu for the cpumask_test_cpu() operation below. */
- if (target_cpu >= nr_cpumask_bits)
- return -EINVAL;
- /* No CPUs should come up or down during this. */
- cpus_read_lock();
- if (!cpu_online(target_cpu)) {
- cpus_read_unlock();
- return -EINVAL;
- }
- /*
- * Synchronizes target_cpu_store() and channel closure:
- *
- * { Initially: state = CHANNEL_OPENED }
- *
- * CPU1 CPU2
- *
- * [target_cpu_store()] [vmbus_disconnect_ring()]
- *
- * LOCK channel_mutex LOCK channel_mutex
- * LOAD r1 = state LOAD r2 = state
- * IF (r1 == CHANNEL_OPENED) IF (r2 == CHANNEL_OPENED)
- * SEND MODIFYCHANNEL STORE state = CHANNEL_OPEN
- * [...] SEND CLOSECHANNEL
- * UNLOCK channel_mutex UNLOCK channel_mutex
- *
- * Forbids: r1 == r2 == CHANNEL_OPENED (i.e., CPU1's LOCK precedes
- * CPU2's LOCK) && CPU2's SEND precedes CPU1's SEND
- *
- * Note. The host processes the channel messages "sequentially", in
- * the order in which they are received on a per-partition basis.
- */
- mutex_lock(&vmbus_connection.channel_mutex);
- /*
- * Hyper-V will ignore MODIFYCHANNEL messages for "non-open" channels;
- * avoid sending the message and fail here for such channels.
- */
- if (channel->state != CHANNEL_OPENED_STATE) {
- ret = -EIO;
- goto cpu_store_unlock;
- }
- origin_cpu = channel->target_cpu;
- if (target_cpu == origin_cpu)
- goto cpu_store_unlock;
- if (vmbus_send_modifychannel(channel->offermsg.child_relid,
- hv_cpu_number_to_vp_number(target_cpu))) {
- ret = -EIO;
- goto cpu_store_unlock;
- }
- /*
- * Warning. At this point, there is *no* guarantee that the host will
- * have successfully processed the vmbus_send_modifychannel() request.
- * See the header comment of vmbus_send_modifychannel() for more info.
- *
- * Lags in the processing of the above vmbus_send_modifychannel() can
- * result in missed interrupts if the "old" target CPU is taken offline
- * before Hyper-V starts sending interrupts to the "new" target CPU.
- * But apart from this offlining scenario, the code tolerates such
- * lags. It will function correctly even if a channel interrupt comes
- * in on a CPU that is different from the channel target_cpu value.
- */
- channel->target_cpu = target_cpu;
- /* See init_vp_index(). */
- if (hv_is_perf_channel(channel))
- hv_update_alloced_cpus(origin_cpu, target_cpu);
- /* Currently set only for storvsc channels. */
- if (channel->change_target_cpu_callback) {
- (*channel->change_target_cpu_callback)(channel,
- origin_cpu, target_cpu);
- }
- cpu_store_unlock:
- mutex_unlock(&vmbus_connection.channel_mutex);
- cpus_read_unlock();
- return ret;
- }
- static VMBUS_CHAN_ATTR(cpu, 0644, target_cpu_show, target_cpu_store);
- static ssize_t channel_pending_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%d\n",
- channel_pending(channel,
- vmbus_connection.monitor_pages[1]));
- }
- static VMBUS_CHAN_ATTR(pending, S_IRUGO, channel_pending_show, NULL);
- static ssize_t channel_latency_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%d\n",
- channel_latency(channel,
- vmbus_connection.monitor_pages[1]));
- }
- static VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL);
- static ssize_t channel_interrupts_show(struct vmbus_channel *channel, char *buf)
- {
- return sprintf(buf, "%llu\n", channel->interrupts);
- }
- static VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL);
- static ssize_t channel_events_show(struct vmbus_channel *channel, char *buf)
- {
- return sprintf(buf, "%llu\n", channel->sig_events);
- }
- static VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);
- static ssize_t channel_intr_in_full_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%llu\n",
- (unsigned long long)channel->intr_in_full);
- }
- static VMBUS_CHAN_ATTR(intr_in_full, 0444, channel_intr_in_full_show, NULL);
- static ssize_t channel_intr_out_empty_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%llu\n",
- (unsigned long long)channel->intr_out_empty);
- }
- static VMBUS_CHAN_ATTR(intr_out_empty, 0444, channel_intr_out_empty_show, NULL);
- static ssize_t channel_out_full_first_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%llu\n",
- (unsigned long long)channel->out_full_first);
- }
- static VMBUS_CHAN_ATTR(out_full_first, 0444, channel_out_full_first_show, NULL);
- static ssize_t channel_out_full_total_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%llu\n",
- (unsigned long long)channel->out_full_total);
- }
- static VMBUS_CHAN_ATTR(out_full_total, 0444, channel_out_full_total_show, NULL);
- static ssize_t subchannel_monitor_id_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%u\n", channel->offermsg.monitorid);
- }
- static VMBUS_CHAN_ATTR(monitor_id, S_IRUGO, subchannel_monitor_id_show, NULL);
- static ssize_t subchannel_id_show(struct vmbus_channel *channel,
- char *buf)
- {
- return sprintf(buf, "%u\n",
- channel->offermsg.offer.sub_channel_index);
- }
- static VMBUS_CHAN_ATTR_RO(subchannel_id);
- static struct attribute *vmbus_chan_attrs[] = {
- &chan_attr_out_mask.attr,
- &chan_attr_in_mask.attr,
- &chan_attr_read_avail.attr,
- &chan_attr_write_avail.attr,
- &chan_attr_cpu.attr,
- &chan_attr_pending.attr,
- &chan_attr_latency.attr,
- &chan_attr_interrupts.attr,
- &chan_attr_events.attr,
- &chan_attr_intr_in_full.attr,
- &chan_attr_intr_out_empty.attr,
- &chan_attr_out_full_first.attr,
- &chan_attr_out_full_total.attr,
- &chan_attr_monitor_id.attr,
- &chan_attr_subchannel_id.attr,
- NULL
- };
- /*
- * Channel-level attribute_group callback function. Returns the permission for
- * each attribute, and returns 0 if an attribute is not visible.
- */
- static umode_t vmbus_chan_attr_is_visible(struct kobject *kobj,
- struct attribute *attr, int idx)
- {
- const struct vmbus_channel *channel =
- container_of(kobj, struct vmbus_channel, kobj);
- /* Hide the monitor attributes if the monitor mechanism is not used. */
- if (!channel->offermsg.monitor_allocated &&
- (attr == &chan_attr_pending.attr ||
- attr == &chan_attr_latency.attr ||
- attr == &chan_attr_monitor_id.attr))
- return 0;
- return attr->mode;
- }
- static struct attribute_group vmbus_chan_group = {
- .attrs = vmbus_chan_attrs,
- .is_visible = vmbus_chan_attr_is_visible
- };
- static struct kobj_type vmbus_chan_ktype = {
- .sysfs_ops = &vmbus_chan_sysfs_ops,
- .release = vmbus_chan_release,
- };
- /*
- * vmbus_add_channel_kobj - setup a sub-directory under device/channels
- */
- int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel)
- {
- const struct device *device = &dev->device;
- struct kobject *kobj = &channel->kobj;
- u32 relid = channel->offermsg.child_relid;
- int ret;
- kobj->kset = dev->channels_kset;
- ret = kobject_init_and_add(kobj, &vmbus_chan_ktype, NULL,
- "%u", relid);
- if (ret) {
- kobject_put(kobj);
- return ret;
- }
- ret = sysfs_create_group(kobj, &vmbus_chan_group);
- if (ret) {
- /*
- * The calling functions' error handling paths will cleanup the
- * empty channel directory.
- */
- kobject_put(kobj);
- dev_err(device, "Unable to set up channel sysfs files\n");
- return ret;
- }
- kobject_uevent(kobj, KOBJ_ADD);
- return 0;
- }
- /*
- * vmbus_remove_channel_attr_group - remove the channel's attribute group
- */
- void vmbus_remove_channel_attr_group(struct vmbus_channel *channel)
- {
- sysfs_remove_group(&channel->kobj, &vmbus_chan_group);
- }
- /*
- * vmbus_device_create - Creates and registers a new child device
- * on the vmbus.
- */
- struct hv_device *vmbus_device_create(const guid_t *type,
- const guid_t *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;
- guid_copy(&child_device_obj->dev_type, type);
- guid_copy(&child_device_obj->dev_instance, instance);
- 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)
- {
- struct kobject *kobj = &child_device_obj->device.kobj;
- int ret;
- dev_set_name(&child_device_obj->device, "%pUl",
- &child_device_obj->channel->offermsg.offer.if_instance);
- 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");
- return ret;
- }
- child_device_obj->channels_kset = kset_create_and_add("channels",
- NULL, kobj);
- if (!child_device_obj->channels_kset) {
- ret = -ENOMEM;
- goto err_dev_unregister;
- }
- ret = vmbus_add_channel_kobj(child_device_obj,
- child_device_obj->channel);
- if (ret) {
- pr_err("Unable to register primary channeln");
- goto err_kset_unregister;
- }
- hv_debug_add_dev_dir(child_device_obj);
- return 0;
- err_kset_unregister:
- kset_unregister(child_device_obj->channels_kset);
- err_dev_unregister:
- device_unregister(&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));
- kset_unregister(device_obj->channels_kset);
- /*
- * 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;
- struct resource r;
- 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;
- /*
- * The IRQ information is needed only on ARM64, which Hyper-V
- * sets up in the extended format. IRQ information is present
- * on x86/x64 in the non-extended format but it is not used by
- * Linux. So don't bother checking for the non-extended format.
- */
- case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
- if (!acpi_dev_resource_interrupt(res, 0, &r)) {
- pr_err("Unable to parse Hyper-V ACPI interrupt\n");
- return AE_ERROR;
- }
- /* ARM64 INTID for VMbus */
- vmbus_interrupt = res->data.extended_irq.interrupts[0];
- /* Linux IRQ number */
- vmbus_irq = r.start;
- return AE_OK;
- 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;
- /*
- * 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)->start > new_res->end) {
- 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) {
- if (fb_mmio) {
- __release_region(hyperv_mmio, fb_mmio->start,
- resource_size(fb_mmio));
- fb_mmio = NULL;
- }
- for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) {
- next_res = cur_res->sibling;
- kfree(cur_res);
- }
- }
- return 0;
- }
- static void vmbus_reserve_fb(void)
- {
- int size;
- /*
- * Make a claim for the frame buffer in the resource tree under the
- * first node, which will be the one below 4GB. The length seems to
- * be underreported, particularly in a Generation 1 VM. So start out
- * reserving a larger area and make it smaller until it succeeds.
- */
- if (screen_info.lfb_base) {
- if (efi_enabled(EFI_BOOT))
- size = max_t(__u32, screen_info.lfb_size, 0x800000);
- else
- size = max_t(__u32, screen_info.lfb_size, 0x4000000);
- for (; !fb_mmio && (size >= 0x100000); size >>= 1) {
- fb_mmio = __request_region(hyperv_mmio,
- screen_info.lfb_base, size,
- fb_mmio_name, 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, *shadow;
- resource_size_t range_min, range_max, start;
- const char *dev_n = dev_name(&device_obj->device);
- int retval;
- retval = -ENXIO;
- mutex_lock(&hyperv_mmio_lock);
- /*
- * If overlaps with frame buffers are allowed, then first attempt to
- * make the allocation from within the reserved region. Because it
- * is already reserved, no shadow allocation is necessary.
- */
- if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) &&
- !(max < fb_mmio->start)) {
- range_min = fb_mmio->start;
- range_max = fb_mmio->end;
- start = (range_min + align - 1) & ~(align - 1);
- for (; start + size - 1 <= range_max; start += align) {
- *new = request_mem_region_exclusive(start, size, dev_n);
- if (*new) {
- retval = 0;
- goto exit;
- }
- }
- }
- for (iter = hyperv_mmio; iter; iter = iter->sibling) {
- if ((iter->start >= max) || (iter->end <= min))
- continue;
- range_min = iter->start;
- range_max = iter->end;
- start = (range_min + align - 1) & ~(align - 1);
- for (; start + size - 1 <= range_max; start += align) {
- shadow = __request_region(iter, start, size, NULL,
- IORESOURCE_BUSY);
- if (!shadow)
- continue;
- *new = request_mem_region_exclusive(start, size, dev_n);
- if (*new) {
- shadow->name = (char *)*new;
- retval = 0;
- goto exit;
- }
- __release_region(iter, start, size);
- }
- }
- exit:
- mutex_unlock(&hyperv_mmio_lock);
- return retval;
- }
- EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
- /**
- * vmbus_free_mmio() - Free a memory-mapped I/O range.
- * @start: Base address of region to release.
- * @size: Size of the range to be allocated
- *
- * This function releases anything requested by
- * vmbus_mmio_allocate().
- */
- void vmbus_free_mmio(resource_size_t start, resource_size_t size)
- {
- struct resource *iter;
- mutex_lock(&hyperv_mmio_lock);
- for (iter = hyperv_mmio; iter; iter = iter->sibling) {
- if ((iter->start >= start + size) || (iter->end <= start))
- continue;
- __release_region(iter, start, size);
- }
- release_mem_region(start, size);
- mutex_unlock(&hyperv_mmio_lock);
- }
- EXPORT_SYMBOL_GPL(vmbus_free_mmio);
- 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) {
- vmbus_reserve_fb();
- break;
- }
- }
- ret_val = 0;
- acpi_walk_err:
- complete(&probe_event);
- if (ret_val)
- vmbus_acpi_remove(device);
- return ret_val;
- }
- #ifdef CONFIG_PM_SLEEP
- static int vmbus_bus_suspend(struct device *dev)
- {
- struct vmbus_channel *channel, *sc;
- while (atomic_read(&vmbus_connection.offer_in_progress) != 0) {
- /*
- * We wait here until the completion of any channel
- * offers that are currently in progress.
- */
- msleep(1);
- }
- mutex_lock(&vmbus_connection.channel_mutex);
- list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
- if (!is_hvsock_channel(channel))
- continue;
- vmbus_force_channel_rescinded(channel);
- }
- mutex_unlock(&vmbus_connection.channel_mutex);
- /*
- * Wait until all the sub-channels and hv_sock channels have been
- * cleaned up. Sub-channels should be destroyed upon suspend, otherwise
- * they would conflict with the new sub-channels that will be created
- * in the resume path. hv_sock channels should also be destroyed, but
- * a hv_sock channel of an established hv_sock connection can not be
- * really destroyed since it may still be referenced by the userspace
- * application, so we just force the hv_sock channel to be rescinded
- * by vmbus_force_channel_rescinded(), and the userspace application
- * will thoroughly destroy the channel after hibernation.
- *
- * Note: the counter nr_chan_close_on_suspend may never go above 0 if
- * the VM has no sub-channel and hv_sock channel, e.g. a 1-vCPU VM.
- */
- if (atomic_read(&vmbus_connection.nr_chan_close_on_suspend) > 0)
- wait_for_completion(&vmbus_connection.ready_for_suspend_event);
- if (atomic_read(&vmbus_connection.nr_chan_fixup_on_resume) != 0) {
- pr_err("Can not suspend due to a previous failed resuming\n");
- return -EBUSY;
- }
- mutex_lock(&vmbus_connection.channel_mutex);
- list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
- /*
- * Remove the channel from the array of channels and invalidate
- * the channel's relid. Upon resume, vmbus_onoffer() will fix
- * up the relid (and other fields, if necessary) and add the
- * channel back to the array.
- */
- vmbus_channel_unmap_relid(channel);
- channel->offermsg.child_relid = INVALID_RELID;
- if (is_hvsock_channel(channel)) {
- if (!channel->rescind) {
- pr_err("hv_sock channel not rescinded!\n");
- WARN_ON_ONCE(1);
- }
- continue;
- }
- list_for_each_entry(sc, &channel->sc_list, sc_list) {
- pr_err("Sub-channel not deleted!\n");
- WARN_ON_ONCE(1);
- }
- atomic_inc(&vmbus_connection.nr_chan_fixup_on_resume);
- }
- mutex_unlock(&vmbus_connection.channel_mutex);
- vmbus_initiate_unload(false);
- /* Reset the event for the next resume. */
- reinit_completion(&vmbus_connection.ready_for_resume_event);
- return 0;
- }
- static int vmbus_bus_resume(struct device *dev)
- {
- struct vmbus_channel_msginfo *msginfo;
- size_t msgsize;
- int ret;
- /*
- * We only use the 'vmbus_proto_version', which was in use before
- * hibernation, to re-negotiate with the host.
- */
- if (!vmbus_proto_version) {
- pr_err("Invalid proto version = 0x%x\n", vmbus_proto_version);
- return -EINVAL;
- }
- msgsize = sizeof(*msginfo) +
- sizeof(struct vmbus_channel_initiate_contact);
- msginfo = kzalloc(msgsize, GFP_KERNEL);
- if (msginfo == NULL)
- return -ENOMEM;
- ret = vmbus_negotiate_version(msginfo, vmbus_proto_version);
- kfree(msginfo);
- if (ret != 0)
- return ret;
- WARN_ON(atomic_read(&vmbus_connection.nr_chan_fixup_on_resume) == 0);
- vmbus_request_offers();
- if (wait_for_completion_timeout(
- &vmbus_connection.ready_for_resume_event, 10 * HZ) == 0)
- pr_err("Some vmbus device is missing after suspending?\n");
- /* Reset the event for the next suspend. */
- reinit_completion(&vmbus_connection.ready_for_suspend_event);
- return 0;
- }
- #else
- #define vmbus_bus_suspend NULL
- #define vmbus_bus_resume NULL
- #endif /* CONFIG_PM_SLEEP */
- static const struct acpi_device_id vmbus_acpi_device_ids[] = {
- {"VMBUS", 0},
- {"VMBus", 0},
- {"", 0},
- };
- MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
- /*
- * Note: we must use the "no_irq" ops, otherwise hibernation can not work with
- * PCI device assignment, because "pci_dev_pm_ops" uses the "noirq" ops: in
- * the resume path, the pci "noirq" restore op runs before "non-noirq" op (see
- * resume_target_kernel() -> dpm_resume_start(), and hibernation_restore() ->
- * dpm_resume_end()). This means vmbus_bus_resume() and the pci-hyperv's
- * resume callback must also run via the "noirq" ops.
- *
- * Set suspend_noirq/resume_noirq to NULL for Suspend-to-Idle: see the comment
- * earlier in this file before vmbus_pm.
- */
- static const struct dev_pm_ops vmbus_bus_pm = {
- .suspend_noirq = NULL,
- .resume_noirq = NULL,
- .freeze_noirq = vmbus_bus_suspend,
- .thaw_noirq = vmbus_bus_resume,
- .poweroff_noirq = vmbus_bus_suspend,
- .restore_noirq = vmbus_bus_resume
- };
- static struct acpi_driver vmbus_acpi_driver = {
- .name = "vmbus",
- .ids = vmbus_acpi_device_ids,
- .ops = {
- .add = vmbus_acpi_add,
- .remove = vmbus_acpi_remove,
- },
- .drv.pm = &vmbus_bus_pm,
- };
- static void hv_kexec_handler(void)
- {
- hv_stimer_global_cleanup();
- vmbus_initiate_unload(false);
- /* Make sure conn_state is set as hv_synic_cleanup checks for it */
- mb();
- cpuhp_remove_state(hyperv_cpuhp_online);
- };
- static void hv_crash_handler(struct pt_regs *regs)
- {
- int cpu;
- 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.
- */
- cpu = smp_processor_id();
- hv_stimer_cleanup(cpu);
- hv_synic_disable_regs(cpu);
- };
- static int hv_synic_suspend(void)
- {
- /*
- * When we reach here, all the non-boot CPUs have been offlined.
- * If we're in a legacy configuration where stimer Direct Mode is
- * not enabled, the stimers on the non-boot CPUs have been unbound
- * in hv_synic_cleanup() -> hv_stimer_legacy_cleanup() ->
- * hv_stimer_cleanup() -> clockevents_unbind_device().
- *
- * hv_synic_suspend() only runs on CPU0 with interrupts disabled.
- * Here we do not call hv_stimer_legacy_cleanup() on CPU0 because:
- * 1) it's unnecessary as interrupts remain disabled between
- * syscore_suspend() and syscore_resume(): see create_image() and
- * resume_target_kernel()
- * 2) the stimer on CPU0 is automatically disabled later by
- * syscore_suspend() -> timekeeping_suspend() -> tick_suspend() -> ...
- * -> clockevents_shutdown() -> ... -> hv_ce_shutdown()
- * 3) a warning would be triggered if we call
- * clockevents_unbind_device(), which may sleep, in an
- * interrupts-disabled context.
- */
- hv_synic_disable_regs(0);
- return 0;
- }
- static void hv_synic_resume(void)
- {
- hv_synic_enable_regs(0);
- /*
- * Note: we don't need to call hv_stimer_init(0), because the timer
- * on CPU0 is not unbound in hv_synic_suspend(), and the timer is
- * automatically re-enabled in timekeeping_resume().
- */
- }
- /* The callbacks run only on CPU0, with irqs_disabled. */
- static struct syscore_ops hv_synic_syscore_ops = {
- .suspend = hv_synic_suspend,
- .resume = hv_synic_resume,
- };
- static int __init hv_acpi_init(void)
- {
- int ret, t;
- if (!hv_is_hyperv_initialized())
- 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;
- }
- hv_debug_init();
- ret = vmbus_bus_init();
- if (ret)
- goto cleanup;
- hv_setup_kexec_handler(hv_kexec_handler);
- hv_setup_crash_handler(hv_crash_handler);
- register_syscore_ops(&hv_synic_syscore_ops);
- return 0;
- cleanup:
- acpi_bus_unregister_driver(&vmbus_acpi_driver);
- hv_acpi_dev = NULL;
- return ret;
- }
- static void __exit vmbus_exit(void)
- {
- int cpu;
- unregister_syscore_ops(&hv_synic_syscore_ops);
- hv_remove_kexec_handler();
- hv_remove_crash_handler();
- vmbus_connection.conn_state = DISCONNECTED;
- hv_stimer_global_cleanup();
- vmbus_disconnect();
- hv_remove_vmbus_irq();
- for_each_online_cpu(cpu) {
- struct hv_per_cpu_context *hv_cpu
- = per_cpu_ptr(hv_context.cpu_context, cpu);
- tasklet_kill(&hv_cpu->msg_dpc);
- }
- hv_debug_rm_all_dir();
- vmbus_free_channels();
- kfree(vmbus_connection.channels);
- if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
- kmsg_dump_unregister(&hv_kmsg_dumper);
- unregister_die_notifier(&hyperv_die_block);
- }
- /*
- * The panic notifier is always registered, hence we should
- * also unconditionally unregister it here as well.
- */
- atomic_notifier_chain_unregister(&panic_notifier_list,
- &hyperv_panic_block);
- free_page((unsigned long)hv_panic_page);
- unregister_sysctl_table(hv_ctl_table_hdr);
- hv_ctl_table_hdr = NULL;
- bus_unregister(&hv_bus);
- cpuhp_remove_state(hyperv_cpuhp_online);
- hv_synic_free();
- acpi_bus_unregister_driver(&vmbus_acpi_driver);
- }
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("Microsoft Hyper-V VMBus Driver");
- subsys_initcall(hv_acpi_init);
- module_exit(vmbus_exit);
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