[mirror_ubuntu-zesty-kernel.git] / 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)
{

	memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
	memset(hv_context.synic_message_page, 0,
	       sizeof(void *) * NR_CPUS);
	memset(hv_context.post_msg_page, 0,
	       sizeof(void *) * NR_CPUS);
	memset(hv_context.vp_index, 0,
	       sizeof(int) * NR_CPUS);
	memset(hv_context.event_dpc, 0,
	       sizeof(void *) * NR_CPUS);
	memset(hv_context.msg_dpc, 0,
	       sizeof(void *) * NR_CPUS);
	memset(hv_context.clk_evt, 0,
	       sizeof(void *) * NR_CPUS);

	if (!hv_is_hypercall_page_setup())
		return -ENOTSUPP;

	return 0;
}

/*
 * 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;
	u64 status;

	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
		return -EMSGSIZE;

	aligned_msg = (struct hv_input_post_message *)
			hv_context.post_msg_page[get_cpu()];

	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);

	put_cpu();
	return status & 0xFFFF;
}

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

	WARN_ON(!clockevent_state_oneshot(evt));

	hv_get_current_tick(current_tick);
	current_tick += delta;
	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
	return 0;
}

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;
}

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;
}

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;
}


int hv_synic_alloc(void)
{
	size_t size = sizeof(struct tasklet_struct);
	size_t ced_size = sizeof(struct clock_event_device);
	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) {
		hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
		if (hv_context.event_dpc[cpu] == NULL) {
			pr_err("Unable to allocate event dpc\n");
			goto err;
		}
		tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);

		hv_context.msg_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
		if (hv_context.msg_dpc[cpu] == NULL) {
			pr_err("Unable to allocate event dpc\n");
			goto err;
		}
		tasklet_init(hv_context.msg_dpc[cpu], vmbus_on_msg_dpc, cpu);

		hv_context.clk_evt[cpu] = kzalloc(ced_size, GFP_ATOMIC);
		if (hv_context.clk_evt[cpu] == NULL) {
			pr_err("Unable to allocate clock event device\n");
			goto err;
		}

		hv_init_clockevent_device(hv_context.clk_evt[cpu], cpu);

		hv_context.synic_message_page[cpu] =
			(void *)get_zeroed_page(GFP_ATOMIC);

		if (hv_context.synic_message_page[cpu] == NULL) {
			pr_err("Unable to allocate SYNIC message page\n");
			goto err;
		}

		hv_context.synic_event_page[cpu] =
			(void *)get_zeroed_page(GFP_ATOMIC);

		if (hv_context.synic_event_page[cpu] == NULL) {
			pr_err("Unable to allocate SYNIC event page\n");
			goto err;
		}

		hv_context.post_msg_page[cpu] =
			(void *)get_zeroed_page(GFP_ATOMIC);

		if (hv_context.post_msg_page[cpu] == NULL) {
			pr_err("Unable to allocate post msg page\n");
			goto err;
		}

		INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
	}

	return 0;
err:
	return -ENOMEM;
}

static void hv_synic_free_cpu(int cpu)
{
	kfree(hv_context.event_dpc[cpu]);
	kfree(hv_context.msg_dpc[cpu]);
	kfree(hv_context.clk_evt[cpu]);
	if (hv_context.synic_event_page[cpu])
		free_page((unsigned long)hv_context.synic_event_page[cpu]);
	if (hv_context.synic_message_page[cpu])
		free_page((unsigned long)hv_context.synic_message_page[cpu]);
	if (hv_context.post_msg_page[cpu])
		free_page((unsigned long)hv_context.post_msg_page[cpu]);
}

void hv_synic_free(void)
{
	int cpu;

	kfree(hv_context.hv_numa_map);
	for_each_present_cpu(cpu)
		hv_synic_free_cpu(cpu);
}

/*
 * 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)
{
	union hv_synic_simp simp;
	union hv_synic_siefp siefp;
	union hv_synic_sint shared_sint;
	union hv_synic_scontrol sctrl;
	u64 vp_index;

	/* Setup the Synic's message page */
	hv_get_simp(simp.as_uint64);
	simp.simp_enabled = 1;
	simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
		>> 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_context.synic_event_page[cpu])
		>> 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;
	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;

	/*
	 * Setup the mapping between Hyper-V's notion
	 * of cpuid and Linux' notion of cpuid.
	 * This array will be indexed using Linux cpuid.
	 */
	hv_get_vp_index(vp_index);
	hv_context.vp_index[cpu] = (u32)vp_index;

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

/*
 * 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)
		clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
}

/*
 * 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) {
		clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
		hv_ce_shutdown(hv_context.clk_evt[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;
}
Commit	Line	Data
3e7ee490	1	/*
3e7ee490 HJ	2	* Copyright (c) 2009, Microsoft Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307 USA.
	16	*
	17	* Authors:
	18	* Haiyang Zhang <haiyangz@microsoft.com>
	19	* Hank Janssen <hjanssen@microsoft.com>
	20	*
	21	*/
0a46618d HJ	22	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0a46618d HJ	23
a0086dc5 GKH	24	#include <linux/kernel.h>
a0086dc5 GKH	25	#include <linux/mm.h>
5a0e3ad6	26	#include <linux/slab.h>
b7c947f0	27	#include <linux/vmalloc.h>
46a97191	28	#include <linux/hyperv.h>
83ba0c4f	29	#include <linux/version.h>
db11f12a	30	#include <linux/interrupt.h>
4061ed9e	31	#include <linux/clockchips.h>
407dd164	32	#include <asm/hyperv.h>
4061ed9e	33	#include <asm/mshyperv.h>
0f2a6619	34	#include "hyperv_vmbus.h"
3e7ee490	35
454f18a9	36	/* The one and only */
6a0aaa18 HZ	37	struct hv_context hv_context = {
6a0aaa18 HZ	38	.synic_initialized = false,
3e7ee490 HJ	39	};
3e7ee490 HJ	40
4061ed9e S	41	#define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */
	42	#define HV_MAX_MAX_DELTA_TICKS 0xffffffff
	43	#define HV_MIN_DELTA_TICKS 1
	44
3e189519	45	/*
d44890c8	46	* hv_init - Main initialization routine.
0831ad04 GKH	47	*
	48	* This routine must be called before any other routines in here are called
	49	*/
d44890c8	50	int hv_init(void)
3e7ee490	51	{
3e7ee490	52
14c1bf8a	53	memset(hv_context.synic_event_page, 0, sizeof(void ) NR_CPUS);
6a0aaa18	54	memset(hv_context.synic_message_page, 0,
14c1bf8a	55	sizeof(void ) NR_CPUS);
b29ef354 S	56	memset(hv_context.post_msg_page, 0,
b29ef354 S	57	sizeof(void ) NR_CPUS);
917ea427 S	58	memset(hv_context.vp_index, 0,
917ea427 S	59	sizeof(int) * NR_CPUS);
db11f12a S	60	memset(hv_context.event_dpc, 0,
db11f12a S	61	sizeof(void ) NR_CPUS);
d81274aa S	62	memset(hv_context.msg_dpc, 0,
d81274aa S	63	sizeof(void ) NR_CPUS);
4061ed9e S	64	memset(hv_context.clk_evt, 0,
4061ed9e S	65	sizeof(void ) NR_CPUS);
3e7ee490	66
c4398016	67	if (!hv_is_hypercall_page_setup())
b1d6b256	68	return -ENOTSUPP;
3e7ee490	69
5433e003	70	return 0;
3e7ee490 HJ	71	}
3e7ee490 HJ	72
3e189519	73	/*
d44890c8	74	* hv_post_message - Post a message using the hypervisor message IPC.
0831ad04 GKH	75	*
	76	* This involves a hypercall.
	77	*/
415f0a02	78	int hv_post_message(union hv_connection_id connection_id,
b8dfb264 HZ	79	enum hv_message_type message_type,
b8dfb264 HZ	80	void *payload, size_t payload_size)
3e7ee490	81	{
3e7ee490	82
b8dfb264	83	struct hv_input_post_message *aligned_msg;
a108393d	84	u64 status;
3e7ee490	85
b8dfb264	86	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
39594abc	87	return -EMSGSIZE;
3e7ee490	88
b8dfb264	89	aligned_msg = (struct hv_input_post_message *)
b29ef354	90	hv_context.post_msg_page[get_cpu()];
3e7ee490	91
b8dfb264	92	aligned_msg->connectionid = connection_id;
b29ef354	93	aligned_msg->reserved = 0;
b8dfb264 HZ	94	aligned_msg->message_type = message_type;
	95	aligned_msg->payload_size = payload_size;
	96	memcpy((void *)aligned_msg->payload, payload, payload_size);
3e7ee490	97
a108393d	98	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
3e7ee490	99
b29ef354	100	put_cpu();
a108393d	101	return status & 0xFFFF;
3e7ee490 HJ	102	}
3e7ee490 HJ	103
4061ed9e S	104	static int hv_ce_set_next_event(unsigned long delta,
	105	struct clock_event_device *evt)
	106	{
a5a1d1c2	107	u64 current_tick;
4061ed9e	108
bc609cb4	109	WARN_ON(!clockevent_state_oneshot(evt));
4061ed9e	110
72329152	111	hv_get_current_tick(current_tick);
4061ed9e	112	current_tick += delta;
72329152	113	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
4061ed9e S	114	return 0;
	115	}
	116
bc609cb4 VK	117	static int hv_ce_shutdown(struct clock_event_device *evt)
bc609cb4 VK	118	{
72329152 S	119	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
72329152 S	120	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);
bc609cb4 VK	121
	122	return 0;
	123	}
	124
	125	static int hv_ce_set_oneshot(struct clock_event_device *evt)
4061ed9e S	126	{
	127	union hv_timer_config timer_cfg;
	128
bc609cb4 VK	129	timer_cfg.enable = 1;
	130	timer_cfg.auto_enable = 1;
	131	timer_cfg.sintx = VMBUS_MESSAGE_SINT;
72329152	132	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
bc609cb4 VK	133
bc609cb4 VK	134	return 0;
4061ed9e S	135	}
	136
	137	static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
	138	{
	139	dev->name = "Hyper-V clockevent";
	140	dev->features = CLOCK_EVT_FEAT_ONESHOT;
	141	dev->cpumask = cpumask_of(cpu);
	142	dev->rating = 1000;
e086748c VK	143	/*
	144	* Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
	145	* result in clockevents_config_and_register() taking additional
	146	* references to the hv_vmbus module making it impossible to unload.
	147	*/
4061ed9e	148
bc609cb4 VK	149	dev->set_state_shutdown = hv_ce_shutdown;
bc609cb4 VK	150	dev->set_state_oneshot = hv_ce_set_oneshot;
4061ed9e S	151	dev->set_next_event = hv_ce_set_next_event;
	152	}
	153
2608fb65 JW	154
	155	int hv_synic_alloc(void)
	156	{
	157	size_t size = sizeof(struct tasklet_struct);
4061ed9e	158	size_t ced_size = sizeof(struct clock_event_device);
2608fb65 JW	159	int cpu;
2608fb65 JW	160
9f01ec53 S	161	hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
	162	GFP_ATOMIC);
	163	if (hv_context.hv_numa_map == NULL) {
	164	pr_err("Unable to allocate NUMA map\n");
	165	goto err;
	166	}
	167
d74e2e80	168	for_each_present_cpu(cpu) {
2608fb65 JW	169	hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
	170	if (hv_context.event_dpc[cpu] == NULL) {
	171	pr_err("Unable to allocate event dpc\n");
	172	goto err;
	173	}
	174	tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
	175
d81274aa S	176	hv_context.msg_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
	177	if (hv_context.msg_dpc[cpu] == NULL) {
	178	pr_err("Unable to allocate event dpc\n");
	179	goto err;
	180	}
	181	tasklet_init(hv_context.msg_dpc[cpu], vmbus_on_msg_dpc, cpu);
	182
4061ed9e S	183	hv_context.clk_evt[cpu] = kzalloc(ced_size, GFP_ATOMIC);
	184	if (hv_context.clk_evt[cpu] == NULL) {
	185	pr_err("Unable to allocate clock event device\n");
	186	goto err;
	187	}
9f01ec53	188
4061ed9e S	189	hv_init_clockevent_device(hv_context.clk_evt[cpu], cpu);
4061ed9e S	190
2608fb65 JW	191	hv_context.synic_message_page[cpu] =
	192	(void *)get_zeroed_page(GFP_ATOMIC);
	193
	194	if (hv_context.synic_message_page[cpu] == NULL) {
	195	pr_err("Unable to allocate SYNIC message page\n");
	196	goto err;
	197	}
	198
	199	hv_context.synic_event_page[cpu] =
	200	(void *)get_zeroed_page(GFP_ATOMIC);
	201
	202	if (hv_context.synic_event_page[cpu] == NULL) {
	203	pr_err("Unable to allocate SYNIC event page\n");
	204	goto err;
	205	}
b29ef354 S	206
	207	hv_context.post_msg_page[cpu] =
	208	(void *)get_zeroed_page(GFP_ATOMIC);
	209
	210	if (hv_context.post_msg_page[cpu] == NULL) {
	211	pr_err("Unable to allocate post msg page\n");
	212	goto err;
	213	}
9b1bf703 VK	214
9b1bf703 VK	215	INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
2608fb65 JW	216	}
	217
	218	return 0;
	219	err:
	220	return -ENOMEM;
	221	}
	222
8712954d	223	static void hv_synic_free_cpu(int cpu)
2608fb65 JW	224	{
2608fb65 JW	225	kfree(hv_context.event_dpc[cpu]);
d81274aa	226	kfree(hv_context.msg_dpc[cpu]);
4061ed9e	227	kfree(hv_context.clk_evt[cpu]);
fdf91dae	228	if (hv_context.synic_event_page[cpu])
2608fb65 JW	229	free_page((unsigned long)hv_context.synic_event_page[cpu]);
	230	if (hv_context.synic_message_page[cpu])
	231	free_page((unsigned long)hv_context.synic_message_page[cpu]);
b29ef354 S	232	if (hv_context.post_msg_page[cpu])
b29ef354 S	233	free_page((unsigned long)hv_context.post_msg_page[cpu]);
2608fb65 JW	234	}
	235
	236	void hv_synic_free(void)
	237	{
	238	int cpu;
	239
9f01ec53	240	kfree(hv_context.hv_numa_map);
d74e2e80	241	for_each_present_cpu(cpu)
2608fb65 JW	242	hv_synic_free_cpu(cpu);
	243	}
	244
3e189519	245	/*
d44890c8	246	* hv_synic_init - Initialize the Synthethic Interrupt Controller.
0831ad04 GKH	247	*
	248	* If it is already initialized by another entity (ie x2v shim), we need to
	249	* retrieve the initialized message and event pages. Otherwise, we create and
	250	* initialize the message and event pages.
	251	*/
fdf5149c	252	int hv_synic_init(unsigned int cpu)
3e7ee490	253	{
eacb1b4d GKH	254	union hv_synic_simp simp;
eacb1b4d GKH	255	union hv_synic_siefp siefp;
b8dfb264	256	union hv_synic_sint shared_sint;
eacb1b4d	257	union hv_synic_scontrol sctrl;
917ea427	258	u64 vp_index;
a73e6b7c	259
a73e6b7c	260	/* Setup the Synic's message page */
a62c7499	261	hv_get_simp(simp.as_uint64);
f6feebe0	262	simp.simp_enabled = 1;
6a0aaa18	263	simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
a73e6b7c	264	>> PAGE_SHIFT;
3e7ee490	265
a62c7499	266	hv_set_simp(simp.as_uint64);
3e7ee490	267
a73e6b7c	268	/* Setup the Synic's event page */
4a14dadd	269	hv_get_siefp(siefp.as_uint64);
f6feebe0	270	siefp.siefp_enabled = 1;
6a0aaa18	271	siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
a73e6b7c HJ	272	>> PAGE_SHIFT;
a73e6b7c HJ	273
4a14dadd	274	hv_set_siefp(siefp.as_uint64);
0831ad04	275
0831ad04	276	/* Setup the shared SINT. */
117f8ab2 S	277	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
117f8ab2 S	278	shared_sint.as_uint64);
3e7ee490	279
b8dfb264	280	shared_sint.as_uint64 = 0;
302a3c0f	281	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
b8dfb264	282	shared_sint.masked = false;
b0209501	283	shared_sint.auto_eoi = true;
3e7ee490	284
117f8ab2 S	285	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
117f8ab2 S	286	shared_sint.as_uint64);
3e7ee490	287
454f18a9	288	/* Enable the global synic bit */
cd0142ec	289	hv_get_synic_state(sctrl.as_uint64);
f6feebe0	290	sctrl.enable = 1;
3e7ee490	291
cd0142ec	292	hv_set_synic_state(sctrl.as_uint64);
3e7ee490	293
6a0aaa18	294	hv_context.synic_initialized = true;
917ea427 S	295
	296	/*
	297	* Setup the mapping between Hyper-V's notion
	298	* of cpuid and Linux' notion of cpuid.
	299	* This array will be indexed using Linux cpuid.
	300	*/
041fcba2	301	hv_get_vp_index(vp_index);
917ea427	302	hv_context.vp_index[cpu] = (u32)vp_index;
3a28fa35	303
4061ed9e S	304	/*
	305	* Register the per-cpu clockevent source.
	306	*/
	307	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
	308	clockevents_config_and_register(hv_context.clk_evt[cpu],
	309	HV_TIMER_FREQUENCY,
	310	HV_MIN_DELTA_TICKS,
	311	HV_MAX_MAX_DELTA_TICKS);
fdf5149c	312	return 0;
3e7ee490 HJ	313	}
3e7ee490 HJ	314
e086748c VK	315	/*
	316	* hv_synic_clockevents_cleanup - Cleanup clockevent devices
	317	*/
	318	void hv_synic_clockevents_cleanup(void)
	319	{
	320	int cpu;
	321
	322	if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
	323	return;
	324
6ffc4b85	325	for_each_present_cpu(cpu)
e086748c VK	326	clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
	327	}
	328
3e189519	329	/*
d44890c8	330	* hv_synic_cleanup - Cleanup routine for hv_synic_init().
0831ad04	331	*/
fdf5149c	332	int hv_synic_cleanup(unsigned int cpu)
3e7ee490	333	{
b8dfb264	334	union hv_synic_sint shared_sint;
eacb1b4d GKH	335	union hv_synic_simp simp;
eacb1b4d GKH	336	union hv_synic_siefp siefp;
e72e7ac5	337	union hv_synic_scontrol sctrl;
ccbf4254 VK	338	struct vmbus_channel channel, sc;
	339	bool channel_found = false;
	340	unsigned long flags;
3e7ee490	341
6a0aaa18	342	if (!hv_context.synic_initialized)
fdf5149c	343	return -EFAULT;
3e7ee490	344
ccbf4254 VK	345	/*
	346	* Search for channels which are bound to the CPU we're about to
	347	* cleanup. In case we find one and vmbus is still connected we need to
	348	* fail, this will effectively prevent CPU offlining. There is no way
	349	* we can re-bind channels to different CPUs for now.
	350	*/
	351	mutex_lock(&vmbus_connection.channel_mutex);
	352	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
	353	if (channel->target_cpu == cpu) {
	354	channel_found = true;
	355	break;
	356	}
	357	spin_lock_irqsave(&channel->lock, flags);
	358	list_for_each_entry(sc, &channel->sc_list, sc_list) {
	359	if (sc->target_cpu == cpu) {
	360	channel_found = true;
	361	break;
	362	}
	363	}
	364	spin_unlock_irqrestore(&channel->lock, flags);
	365	if (channel_found)
	366	break;
	367	}
	368	mutex_unlock(&vmbus_connection.channel_mutex);
	369
	370	if (channel_found && vmbus_connection.conn_state == CONNECTED)
	371	return -EBUSY;
	372
e086748c	373	/* Turn off clockevent device */
6ffc4b85 VK	374	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
6ffc4b85 VK	375	clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
bc609cb4	376	hv_ce_shutdown(hv_context.clk_evt[cpu]);
6ffc4b85	377	}
e086748c	378
117f8ab2 S	379	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
117f8ab2 S	380	shared_sint.as_uint64);
3e7ee490	381
b8dfb264	382	shared_sint.masked = 1;
3e7ee490	383
7692fd4d	384	/* Need to correctly cleanup in the case of SMP!!! */
454f18a9	385	/* Disable the interrupt */
117f8ab2 S	386	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
117f8ab2 S	387	shared_sint.as_uint64);
3e7ee490	388
a62c7499	389	hv_get_simp(simp.as_uint64);
f6feebe0 HZ	390	simp.simp_enabled = 0;
f6feebe0 HZ	391	simp.base_simp_gpa = 0;
3e7ee490	392
a62c7499	393	hv_set_simp(simp.as_uint64);
3e7ee490	394
4a14dadd	395	hv_get_siefp(siefp.as_uint64);
f6feebe0 HZ	396	siefp.siefp_enabled = 0;
f6feebe0 HZ	397	siefp.base_siefp_gpa = 0;
3e7ee490	398
4a14dadd	399	hv_set_siefp(siefp.as_uint64);
3e7ee490	400
e72e7ac5	401	/* Disable the global synic bit */
cd0142ec	402	hv_get_synic_state(sctrl.as_uint64);
e72e7ac5	403	sctrl.enable = 0;
cd0142ec	404	hv_set_synic_state(sctrl.as_uint64);
fdf5149c VK	405
fdf5149c VK	406	return 0;
3e7ee490	407	}