Release 4.14 drivers/hv/hv.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>
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/hyperv.h>
#include <linux/version.h>
#include <linux/interrupt.h>
#include <linux/clockchips.h>
#include <asm/hyperv.h>
#include <asm/mshyperv.h>
#include "hyperv_vmbus.h"

/* The one and only */

struct hv_context hv_context = {
	.synic_initialized	= false,
};


#define HV_TIMER_FREQUENCY (10 * 1000 * 1000) 
/* 100ns period */

#define HV_MAX_MAX_DELTA_TICKS 0xffffffff

#define HV_MIN_DELTA_TICKS 1

/*
 * hv_init - Main initialization routine.
 *
 * This routine must be called before any other routines in here are called
 */


int hv_init(void)
{
	if (!hv_is_hypercall_page_setup())
		return -ENOTSUPP;

	hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
	if (!hv_context.cpu_context)
		return -ENOMEM;

	return 0;
}

Contributors
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Stephen Hemminger
19
46.34%
1
12.50%
Hank Janssen
11
26.83%
1
12.50%
K. Y. Srinivasan
9
21.95%
4
50.00%
Haiyang Zhang
1
2.44%
1
12.50%
Greg Kroah-Hartman
1
2.44%
1
12.50%
Total
41
100.00%
8
100.00%

/*
 * hv_post_message - Post a message using the hypervisor message IPC.
 *
 * This involves a hypercall.
 */


int hv_post_message(union hv_connection_id connection_id,
		  enum hv_message_type message_type,
		  void *payload, size_t payload_size)
{
	struct hv_input_post_message *aligned_msg;
	struct hv_per_cpu_context *hv_cpu;
	u64 status;

	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
		return -EMSGSIZE;

	hv_cpu = get_cpu_ptr(hv_context.cpu_context);
	aligned_msg = hv_cpu->post_msg_page;
	aligned_msg->connectionid = connection_id;
	aligned_msg->reserved = 0;
	aligned_msg->message_type = message_type;
	aligned_msg->payload_size = payload_size;
	memcpy((void *)aligned_msg->payload, payload, payload_size);

	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);

	/* Preemption must remain disabled until after the hypercall
         * so some other thread can't get scheduled onto this cpu and
         * corrupt the per-cpu post_msg_page
         */
	put_cpu_ptr(hv_cpu);

	return status & 0xFFFF;
}

Contributors
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Tokens
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CommitProp
Hank Janssen
52
43.70%
1
6.67%
Haiyang Zhang
20
16.81%
3
20.00%
Stephen Hemminger
15
12.61%
1
6.67%
Greg Kroah-Hartman
11
9.24%
5
33.33%
K. Y. Srinivasan
10
8.40%
2
13.33%
Michael Kelley
6
5.04%
1
6.67%
Jake Oshins
4
3.36%
1
6.67%
Dan Carpenter
1
0.84%
1
6.67%
Total
119
100.00%
15
100.00%



static int hv_ce_set_next_event(unsigned long delta,
				struct clock_event_device *evt)
{
	u64 current_tick;

	WARN_ON(!clockevent_state_oneshot(evt));

	current_tick = hyperv_cs->read(NULL);
	current_tick += delta;
	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
	return 0;
}

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K. Y. Srinivasan
45
90.00%
3
60.00%
Viresh Kumar
4
8.00%
1
20.00%
Thomas Gleixner
1
2.00%
1
20.00%
Total
50
100.00%
5
100.00%



static int hv_ce_shutdown(struct clock_event_device *evt)
{
	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);

	return 0;
}

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Viresh Kumar
25
89.29%
1
33.33%
K. Y. Srinivasan
3
10.71%
2
66.67%
Total
28
100.00%
3
100.00%



static int hv_ce_set_oneshot(struct clock_event_device *evt)
{
	union hv_timer_config timer_cfg;

	timer_cfg.enable = 1;
	timer_cfg.auto_enable = 1;
	timer_cfg.sintx = VMBUS_MESSAGE_SINT;
	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);

	return 0;
}

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K. Y. Srinivasan
40
88.89%
2
66.67%
Viresh Kumar
5
11.11%
1
33.33%
Total
45
100.00%
3
100.00%



static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
{
	dev->name = "Hyper-V clockevent";
	dev->features = CLOCK_EVT_FEAT_ONESHOT;
	dev->cpumask = cpumask_of(cpu);
	dev->rating = 1000;
	/*
         * Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
         * result in clockevents_config_and_register() taking additional
         * references to the hv_vmbus module making it impossible to unload.
         */

	dev->set_state_shutdown = hv_ce_shutdown;
	dev->set_state_oneshot = hv_ce_set_oneshot;
	dev->set_next_event = hv_ce_set_next_event;
}


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K. Y. Srinivasan
51
85.00%
1
33.33%
Viresh Kumar
8
13.33%
1
33.33%
Vitaly Kuznetsov
1
1.67%
1
33.33%
Total
60
100.00%
3
100.00%



int hv_synic_alloc(void)
{
	int cpu;

	hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
					 GFP_ATOMIC);
	if (hv_context.hv_numa_map == NULL) {
		pr_err("Unable to allocate NUMA map\n");
		goto err;
	}

	for_each_present_cpu(cpu) {
		struct hv_per_cpu_context *hv_cpu
			= per_cpu_ptr(hv_context.cpu_context, cpu);

		memset(hv_cpu, 0, sizeof(*hv_cpu));
		tasklet_init(&hv_cpu->msg_dpc,
			     vmbus_on_msg_dpc, (unsigned long) hv_cpu);

		hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
					  GFP_KERNEL);
		if (hv_cpu->clk_evt == NULL) {
			pr_err("Unable to allocate clock event device\n");
			goto err;
		}
		hv_init_clockevent_device(hv_cpu->clk_evt, cpu);

		hv_cpu->synic_message_page =
			(void *)get_zeroed_page(GFP_ATOMIC);
		if (hv_cpu->synic_message_page == NULL) {
			pr_err("Unable to allocate SYNIC message page\n");
			goto err;
		}

		hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
		if (hv_cpu->synic_event_page == NULL) {
			pr_err("Unable to allocate SYNIC event page\n");
			goto err;
		}

		hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
		if (hv_cpu->post_msg_page == NULL) {
			pr_err("Unable to allocate post msg page\n");
			goto err;
		}

		INIT_LIST_HEAD(&hv_cpu->chan_list);
	}

	return 0;
err:
	return -ENOMEM;
}


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K. Y. Srinivasan
106
43.09%
5
38.46%
Stephen Hemminger
54
21.95%
1
7.69%
Hank Janssen
44
17.89%
2
15.38%
Jason (Hui) Wang
17
6.91%
1
7.69%
Greg Kroah-Hartman
14
5.69%
1
7.69%
Vitaly Kuznetsov
6
2.44%
2
15.38%
Haiyang Zhang
5
2.03%
1
7.69%
Total
246
100.00%
13
100.00%



void hv_synic_free(void)
{
	int cpu;

	for_each_present_cpu(cpu) {
		struct hv_per_cpu_context *hv_cpu
			= per_cpu_ptr(hv_context.cpu_context, cpu);

		if (hv_cpu->synic_event_page)
			free_page((unsigned long)hv_cpu->synic_event_page);
		if (hv_cpu->synic_message_page)
			free_page((unsigned long)hv_cpu->synic_message_page);
		if (hv_cpu->post_msg_page)
			free_page((unsigned long)hv_cpu->post_msg_page);
	}

	kfree(hv_context.hv_numa_map);
}

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Jason (Hui) Wang
32
36.36%
1
14.29%
Stephen Hemminger
28
31.82%
1
14.29%
K. Y. Srinivasan
27
30.68%
4
57.14%
Felipe Pena
1
1.14%
1
14.29%
Total
88
100.00%
7
100.00%

/*
 * hv_synic_init - Initialize the Synthethic Interrupt Controller.
 *
 * If it is already initialized by another entity (ie x2v shim), we need to
 * retrieve the initialized message and event pages.  Otherwise, we create and
 * initialize the message and event pages.
 */


int hv_synic_init(unsigned int cpu)
{
	struct hv_per_cpu_context *hv_cpu
		= per_cpu_ptr(hv_context.cpu_context, cpu);
	union hv_synic_simp simp;
	union hv_synic_siefp siefp;
	union hv_synic_sint shared_sint;
	union hv_synic_scontrol sctrl;

	/* Setup the Synic's message page */
	hv_get_simp(simp.as_uint64);
	simp.simp_enabled = 1;
	simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
		>> PAGE_SHIFT;

	hv_set_simp(simp.as_uint64);

	/* Setup the Synic's event page */
	hv_get_siefp(siefp.as_uint64);
	siefp.siefp_enabled = 1;
	siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
		>> PAGE_SHIFT;

	hv_set_siefp(siefp.as_uint64);

	/* Setup the shared SINT. */
	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
			    shared_sint.as_uint64);

	shared_sint.as_uint64 = 0;
	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
	shared_sint.masked = false;
	if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
		shared_sint.auto_eoi = false;
	else
		shared_sint.auto_eoi = true;

	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
			    shared_sint.as_uint64);

	/* Enable the global synic bit */
	hv_get_synic_state(sctrl.as_uint64);
	sctrl.enable = 1;

	hv_set_synic_state(sctrl.as_uint64);

	hv_context.synic_initialized = true;

	/*
         * Register the per-cpu clockevent source.
         */
	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
		clockevents_config_and_register(hv_cpu->clk_evt,
						HV_TIMER_FREQUENCY,
						HV_MIN_DELTA_TICKS,
						HV_MAX_MAX_DELTA_TICKS);
	return 0;
}

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Hank Janssen
89
40.27%
1
5.26%
K. Y. Srinivasan
45
20.36%
8
42.11%
Haiyang Zhang
27
12.22%
3
15.79%
Stephen Hemminger
20
9.05%
1
5.26%
Jason (Hui) Wang
20
9.05%
1
5.26%
Greg Kroah-Hartman
9
4.07%
3
15.79%
Vitaly Kuznetsov
7
3.17%
1
5.26%
Bill Pemberton
4
1.81%
1
5.26%
Total
221
100.00%
19
100.00%

/*
 * hv_synic_clockevents_cleanup - Cleanup clockevent devices
 */


void hv_synic_clockevents_cleanup(void)
{
	int cpu;

	if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
		return;

	for_each_present_cpu(cpu) {
		struct hv_per_cpu_context *hv_cpu
			= per_cpu_ptr(hv_context.cpu_context, cpu);

		clockevents_unbind_device(hv_cpu->clk_evt, cpu);
	}
}

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Vitaly Kuznetsov
34
66.67%
2
66.67%
Stephen Hemminger
17
33.33%
1
33.33%
Total
51
100.00%
3
100.00%

/*
 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
 */


int hv_synic_cleanup(unsigned int cpu)
{
	union hv_synic_sint shared_sint;
	union hv_synic_simp simp;
	union hv_synic_siefp siefp;
	union hv_synic_scontrol sctrl;
	struct vmbus_channel *channel, *sc;
	bool channel_found = false;
	unsigned long flags;

	if (!hv_context.synic_initialized)
		return -EFAULT;

	/*
         * Search for channels which are bound to the CPU we're about to
         * cleanup. In case we find one and vmbus is still connected we need to
         * fail, this will effectively prevent CPU offlining. There is no way
         * we can re-bind channels to different CPUs for now.
         */
	mutex_lock(&vmbus_connection.channel_mutex);
	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
		if (channel->target_cpu == cpu) {
			channel_found = true;
			break;
		}
		spin_lock_irqsave(&channel->lock, flags);
		list_for_each_entry(sc, &channel->sc_list, sc_list) {
			if (sc->target_cpu == cpu) {
				channel_found = true;
				break;
			}
		}
		spin_unlock_irqrestore(&channel->lock, flags);
		if (channel_found)
			break;
	}
	mutex_unlock(&vmbus_connection.channel_mutex);

	if (channel_found && vmbus_connection.conn_state == CONNECTED)
		return -EBUSY;

	/* Turn off clockevent device */
	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
		struct hv_per_cpu_context *hv_cpu
			= this_cpu_ptr(hv_context.cpu_context);

		clockevents_unbind_device(hv_cpu->clk_evt, cpu);
		hv_ce_shutdown(hv_cpu->clk_evt);
		put_cpu_ptr(hv_cpu);
	}

	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
			    shared_sint.as_uint64);

	shared_sint.masked = 1;

	/* Need to correctly cleanup in the case of SMP!!! */
	/* Disable the interrupt */
	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
			    shared_sint.as_uint64);

	hv_get_simp(simp.as_uint64);
	simp.simp_enabled = 0;
	simp.base_simp_gpa = 0;

	hv_set_simp(simp.as_uint64);

	hv_get_siefp(siefp.as_uint64);
	siefp.siefp_enabled = 0;
	siefp.base_siefp_gpa = 0;

	hv_set_siefp(siefp.as_uint64);

	/* Disable the global synic bit */
	hv_get_synic_state(sctrl.as_uint64);
	sctrl.enable = 0;
	hv_set_synic_state(sctrl.as_uint64);

	return 0;
}
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Vitaly Kuznetsov
174
56.31%
5
25.00%
Hank Janssen
76
24.60%
1
5.00%
Stephen Hemminger
20
6.47%
1
5.00%
Haiyang Zhang
18
5.83%
4
20.00%
Greg Kroah-Hartman
11
3.56%
3
15.00%
K. Y. Srinivasan
8
2.59%
4
20.00%
Bill Pemberton
1
0.32%
1
5.00%
Viresh Kumar
1
0.32%
1
5.00%
Total
309
100.00%
20
100.00%

Overall Contributors
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Tokens
Prop
Commits
CommitProp
K. Y. Srinivasan
372
27.99%
20
33.90%
Hank Janssen
287
21.60%
2
3.39%
Vitaly Kuznetsov
223
16.78%
7
11.86%
Stephen Hemminger
173
13.02%
1
1.69%
Haiyang Zhang
76
5.72%
4
6.78%
Jason (Hui) Wang
70
5.27%
1
1.69%
Greg Kroah-Hartman
61
4.59%
15
25.42%
Viresh Kumar
43
3.24%
1
1.69%
Bill Pemberton
8
0.60%
2
3.39%
Michael Kelley
6
0.45%
1
1.69%
Jake Oshins
4
0.30%
1
1.69%
Tejun Heo
3
0.23%
1
1.69%
Dan Carpenter
1
0.08%
1
1.69%
Felipe Pena
1
0.08%
1
1.69%
Thomas Gleixner
1
0.08%
1
1.69%
Total
1329
100.00%
59
100.00%
Directory: drivers/hv

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