mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Dexuan Cui](/assets/img/avatar_default.png)
Without the patch, a device can't be thoroughly destroyed, because
vmbus_device_register() -> kset_create_and_add() still holds a reference
to the hv_device's device.kobj.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Fixes: c2e5df616e
("vmbus: add per-channel sysfs info")
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1788 lines
45 KiB
C
1788 lines
45 KiB
C
/*
|
|
* Copyright (c) 2009, Microsoft Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
* Place - Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
* Authors:
|
|
* Haiyang Zhang <haiyangz@microsoft.com>
|
|
* Hank Janssen <hjanssen@microsoft.com>
|
|
* 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 <asm/hyperv.h>
|
|
#include <asm/hypervisor.h>
|
|
#include <asm/mshyperv.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 "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 int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
|
|
void *args)
|
|
{
|
|
struct pt_regs *regs;
|
|
|
|
regs = current_pt_regs();
|
|
|
|
hyperv_report_panic(regs, val);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
|
|
void *args)
|
|
{
|
|
struct die_args *die = (struct die_args *)args;
|
|
struct pt_regs *regs = die->regs;
|
|
|
|
hyperv_report_panic(regs, val);
|
|
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_SEMAPHORE(hyperv_mmio_lock);
|
|
|
|
static int vmbus_exists(void)
|
|
{
|
|
if (hv_acpi_dev == NULL)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
|
|
static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
|
|
{
|
|
int i;
|
|
for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
|
|
sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
|
|
}
|
|
|
|
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.b);
|
|
}
|
|
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.b);
|
|
}
|
|
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);
|
|
char alias_name[VMBUS_ALIAS_LEN + 1];
|
|
|
|
print_alias_name(hv_dev, alias_name);
|
|
return sprintf(buf, "vmbus:%s\n", alias_name);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
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[1]));
|
|
}
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
|
|
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;
|
|
|
|
if (!hv_dev->channel)
|
|
return -ENODEV;
|
|
hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
|
|
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;
|
|
unsigned long flags;
|
|
int buf_size = PAGE_SIZE, n_written, tot_written;
|
|
struct list_head *cur;
|
|
|
|
if (!channel)
|
|
return -ENODEV;
|
|
|
|
tot_written = snprintf(buf, buf_size, "%u:%u\n",
|
|
channel->offermsg.child_relid, channel->target_cpu);
|
|
|
|
spin_lock_irqsave(&channel->lock, flags);
|
|
|
|
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;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&channel->lock, flags);
|
|
|
|
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);
|
|
|
|
/* 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,
|
|
&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_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);
|
|
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(struct hv_driver *drv,
|
|
const uuid_le *guid)
|
|
{
|
|
const struct hv_vmbus_device_id *id = NULL;
|
|
struct vmbus_dynid *dynid;
|
|
|
|
/* Look at the dynamic ids first, before the static ones */
|
|
spin_lock(&drv->dynids.lock);
|
|
list_for_each_entry(dynid, &drv->dynids.list, node) {
|
|
if (!uuid_le_cmp(dynid->id.guid, *guid)) {
|
|
id = &dynid->id;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&drv->dynids.lock);
|
|
|
|
if (id)
|
|
return id;
|
|
|
|
id = drv->id_table;
|
|
if (id == NULL)
|
|
return NULL; /* empty device table */
|
|
|
|
for (; !is_null_guid(&id->guid); id++)
|
|
if (!uuid_le_cmp(id->guid, *guid))
|
|
return id;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */
|
|
static int vmbus_add_dynid(struct hv_driver *drv, uuid_le *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);
|
|
uuid_le guid;
|
|
ssize_t retval;
|
|
|
|
retval = uuid_le_to_bin(buf, &guid);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (hv_vmbus_get_id(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;
|
|
uuid_le guid;
|
|
ssize_t retval;
|
|
|
|
retval = uuid_le_to_bin(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 (!uuid_le_cmp(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->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, &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);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
|
|
mutex_lock(&vmbus_connection.channel_mutex);
|
|
hv_process_channel_removal(channel->offermsg.child_relid);
|
|
mutex_unlock(&vmbus_connection.channel_mutex);
|
|
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_dev_groups,
|
|
.drv_groups = vmbus_drv_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,
|
|
struct hv_per_cpu_context *hv_cpu)
|
|
{
|
|
struct clock_event_device *dev = hv_cpu->clk_evt;
|
|
|
|
if (dev->event_handler)
|
|
dev->event_handler(dev);
|
|
|
|
vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED);
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
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));
|
|
|
|
/*
|
|
* The host can generate a rescind message while we
|
|
* may still be handling the original offer. We deal with
|
|
* this condition by ensuring the processing is done on the
|
|
* same CPU.
|
|
*/
|
|
switch (hdr->msgtype) {
|
|
case CHANNELMSG_RESCIND_CHANNELOFFER:
|
|
/*
|
|
* If we are handling the rescind message;
|
|
* schedule the work on the global work queue.
|
|
*/
|
|
schedule_work_on(vmbus_connection.connect_cpu,
|
|
&ctx->work);
|
|
break;
|
|
|
|
case CHANNELMSG_OFFERCHANNEL:
|
|
atomic_inc(&vmbus_connection.offer_in_progress);
|
|
queue_work_on(vmbus_connection.connect_cpu,
|
|
vmbus_connection.work_queue,
|
|
&ctx->work);
|
|
break;
|
|
|
|
default:
|
|
queue_work(vmbus_connection.work_queue, &ctx->work);
|
|
}
|
|
} else
|
|
entry->message_handler(hdr);
|
|
|
|
msg_handled:
|
|
vmbus_signal_eom(msg, message_type);
|
|
}
|
|
|
|
|
|
/*
|
|
* Direct callback for channels using other deferred processing
|
|
*/
|
|
static void vmbus_channel_isr(struct vmbus_channel *channel)
|
|
{
|
|
void (*callback_fn)(void *);
|
|
|
|
callback_fn = READ_ONCE(channel->onchannel_callback);
|
|
if (likely(callback_fn != NULL))
|
|
(*callback_fn)(channel->channel_callback_context);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
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;
|
|
|
|
rcu_read_lock();
|
|
|
|
/* Find channel based on relid */
|
|
list_for_each_entry_rcu(channel, &hv_cpu->chan_list, percpu_list) {
|
|
if (channel->offermsg.child_relid != relid)
|
|
continue;
|
|
|
|
if (channel->rescind)
|
|
continue;
|
|
|
|
trace_vmbus_chan_sched(channel);
|
|
|
|
++channel->interrupts;
|
|
|
|
switch (channel->callback_mode) {
|
|
case HV_CALL_ISR:
|
|
vmbus_channel_isr(channel);
|
|
break;
|
|
|
|
case HV_CALL_BATCHED:
|
|
hv_begin_read(&channel->inbound);
|
|
/* fallthrough */
|
|
case HV_CALL_DIRECT:
|
|
tasklet_schedule(&channel->callback_event);
|
|
}
|
|
}
|
|
|
|
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_process_timer_expiration(msg, hv_cpu);
|
|
else
|
|
tasklet_schedule(&hv_cpu->msg_dpc);
|
|
}
|
|
|
|
add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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)
|
|
return ret;
|
|
|
|
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.
|
|
*/
|
|
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online",
|
|
hv_synic_init, hv_synic_cleanup);
|
|
if (ret < 0)
|
|
goto err_alloc;
|
|
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) {
|
|
register_die_notifier(&hyperv_die_block);
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&hyperv_panic_block);
|
|
}
|
|
|
|
vmbus_request_offers();
|
|
|
|
return 0;
|
|
|
|
err_connect:
|
|
cpuhp_remove_state(hyperv_cpuhp_online);
|
|
err_alloc:
|
|
hv_synic_free();
|
|
hv_remove_vmbus_irq();
|
|
|
|
bus_unregister(&hv_bus);
|
|
|
|
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)(const 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);
|
|
const struct vmbus_channel *chan
|
|
= container_of(kobj, struct vmbus_channel, kobj);
|
|
|
|
if (!attribute->show)
|
|
return -EIO;
|
|
|
|
return attribute->show(chan, buf);
|
|
}
|
|
|
|
static const struct sysfs_ops vmbus_chan_sysfs_ops = {
|
|
.show = vmbus_chan_attr_show,
|
|
};
|
|
|
|
static ssize_t out_mask_show(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
const struct hv_ring_buffer_info *rbi = &channel->outbound;
|
|
|
|
return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
|
|
}
|
|
VMBUS_CHAN_ATTR_RO(out_mask);
|
|
|
|
static ssize_t in_mask_show(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
const struct hv_ring_buffer_info *rbi = &channel->inbound;
|
|
|
|
return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
|
|
}
|
|
VMBUS_CHAN_ATTR_RO(in_mask);
|
|
|
|
static ssize_t read_avail_show(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
const struct hv_ring_buffer_info *rbi = &channel->inbound;
|
|
|
|
return sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi));
|
|
}
|
|
VMBUS_CHAN_ATTR_RO(read_avail);
|
|
|
|
static ssize_t write_avail_show(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
const struct hv_ring_buffer_info *rbi = &channel->outbound;
|
|
|
|
return sprintf(buf, "%u\n", hv_get_bytes_to_write(rbi));
|
|
}
|
|
VMBUS_CHAN_ATTR_RO(write_avail);
|
|
|
|
static ssize_t show_target_cpu(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
return sprintf(buf, "%u\n", channel->target_cpu);
|
|
}
|
|
VMBUS_CHAN_ATTR(cpu, S_IRUGO, show_target_cpu, NULL);
|
|
|
|
static ssize_t channel_pending_show(const struct vmbus_channel *channel,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n",
|
|
channel_pending(channel,
|
|
vmbus_connection.monitor_pages[1]));
|
|
}
|
|
VMBUS_CHAN_ATTR(pending, S_IRUGO, channel_pending_show, NULL);
|
|
|
|
static ssize_t channel_latency_show(const struct vmbus_channel *channel,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n",
|
|
channel_latency(channel,
|
|
vmbus_connection.monitor_pages[1]));
|
|
}
|
|
VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL);
|
|
|
|
static ssize_t channel_interrupts_show(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
return sprintf(buf, "%llu\n", channel->interrupts);
|
|
}
|
|
VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL);
|
|
|
|
static ssize_t channel_events_show(const struct vmbus_channel *channel, char *buf)
|
|
{
|
|
return sprintf(buf, "%llu\n", channel->sig_events);
|
|
}
|
|
VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);
|
|
|
|
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,
|
|
NULL
|
|
};
|
|
|
|
static struct kobj_type vmbus_chan_ktype = {
|
|
.sysfs_ops = &vmbus_chan_sysfs_ops,
|
|
.release = vmbus_chan_release,
|
|
.default_attrs = vmbus_chan_attrs,
|
|
};
|
|
|
|
/*
|
|
* vmbus_add_channel_kobj - setup a sub-directory under device/channels
|
|
*/
|
|
int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel)
|
|
{
|
|
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)
|
|
return ret;
|
|
|
|
kobject_uevent(kobj, KOBJ_ADD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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.b);
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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;
|
|
down(&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:
|
|
up(&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;
|
|
|
|
down(&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);
|
|
up(&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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
hv_synic_clockevents_cleanup();
|
|
vmbus_initiate_unload(false);
|
|
vmbus_connection.conn_state = DISCONNECTED;
|
|
/* Make sure conn_state is set as hv_synic_cleanup checks for it */
|
|
mb();
|
|
cpuhp_remove_state(hyperv_cpuhp_online);
|
|
hyperv_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.
|
|
*/
|
|
vmbus_connection.conn_state = DISCONNECTED;
|
|
hv_synic_cleanup(smp_processor_id());
|
|
hyperv_cleanup();
|
|
};
|
|
|
|
static int __init hv_acpi_init(void)
|
|
{
|
|
int ret, t;
|
|
|
|
if (x86_hyper_type != 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) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
tasklet_kill(&hv_cpu->msg_dpc);
|
|
}
|
|
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);
|
|
|
|
cpuhp_remove_state(hyperv_cpuhp_online);
|
|
hv_synic_free();
|
|
acpi_bus_unregister_driver(&vmbus_acpi_driver);
|
|
}
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
subsys_initcall(hv_acpi_init);
|
|
module_exit(vmbus_exit);
|