[mirror_ubuntu-artful-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)
{
	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;
}

/*
 * 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;
}

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;
}

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)
{
	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;
}


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);
}

/*
 * 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;
	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_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;

	/*
	 * 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_cpu->clk_evt,
						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) {
		struct hv_per_cpu_context *hv_cpu
			= per_cpu_ptr(hv_context.cpu_context, cpu);

		clockevents_unbind_device(hv_cpu->clk_evt, 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) {
		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;
}
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	{
73638cdd	52	if (!hv_is_hypercall_page_setup())
8730046c	53	return -ENOTSUPP;
3e7ee490	54
37cdd991 SH	55	hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
	56	if (!hv_context.cpu_context)
	57	return -ENOMEM;
	58
5433e003	59	return 0;
3e7ee490 HJ	60	}
3e7ee490 HJ	61
3e189519	62	/*
d44890c8	63	* hv_post_message - Post a message using the hypervisor message IPC.
0831ad04 GKH	64	*
	65	* This involves a hypercall.
	66	*/
415f0a02	67	int hv_post_message(union hv_connection_id connection_id,
b8dfb264 HZ	68	enum hv_message_type message_type,
b8dfb264 HZ	69	void *payload, size_t payload_size)
3e7ee490	70	{
b8dfb264	71	struct hv_input_post_message *aligned_msg;
37cdd991	72	struct hv_per_cpu_context *hv_cpu;
a108393d	73	u64 status;
3e7ee490	74
b8dfb264	75	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
39594abc	76	return -EMSGSIZE;
3e7ee490	77
37cdd991 SH	78	hv_cpu = get_cpu_ptr(hv_context.cpu_context);
37cdd991 SH	79	aligned_msg = hv_cpu->post_msg_page;
b8dfb264	80	aligned_msg->connectionid = connection_id;
b29ef354	81	aligned_msg->reserved = 0;
b8dfb264 HZ	82	aligned_msg->message_type = message_type;
	83	aligned_msg->payload_size = payload_size;
	84	memcpy((void *)aligned_msg->payload, payload, payload_size);
3e7ee490	85
a108393d	86	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
3e7ee490	87
13b9abfc MK	88	/* Preemption must remain disabled until after the hypercall
	89	* so some other thread can't get scheduled onto this cpu and
	90	* corrupt the per-cpu post_msg_page
	91	*/
	92	put_cpu_ptr(hv_cpu);
	93
a108393d	94	return status & 0xFFFF;
3e7ee490 HJ	95	}
3e7ee490 HJ	96
4061ed9e S	97	static int hv_ce_set_next_event(unsigned long delta,
	98	struct clock_event_device *evt)
	99	{
a5a1d1c2	100	u64 current_tick;
4061ed9e	101
bc609cb4	102	WARN_ON(!clockevent_state_oneshot(evt));
4061ed9e	103
e546d778	104	current_tick = hyperv_cs->read(NULL);
4061ed9e	105	current_tick += delta;
d5116b40	106	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
4061ed9e S	107	return 0;
	108	}
	109
bc609cb4 VK	110	static int hv_ce_shutdown(struct clock_event_device *evt)
bc609cb4 VK	111	{
d5116b40 S	112	hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
d5116b40 S	113	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);
bc609cb4 VK	114
	115	return 0;
	116	}
	117
	118	static int hv_ce_set_oneshot(struct clock_event_device *evt)
4061ed9e S	119	{
	120	union hv_timer_config timer_cfg;
	121
bc609cb4 VK	122	timer_cfg.enable = 1;
	123	timer_cfg.auto_enable = 1;
	124	timer_cfg.sintx = VMBUS_MESSAGE_SINT;
d5116b40	125	hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
bc609cb4 VK	126
bc609cb4 VK	127	return 0;
4061ed9e S	128	}
	129
	130	static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
	131	{
	132	dev->name = "Hyper-V clockevent";
	133	dev->features = CLOCK_EVT_FEAT_ONESHOT;
	134	dev->cpumask = cpumask_of(cpu);
	135	dev->rating = 1000;
e086748c VK	136	/*
	137	* Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
	138	* result in clockevents_config_and_register() taking additional
	139	* references to the hv_vmbus module making it impossible to unload.
	140	*/
4061ed9e	141
bc609cb4 VK	142	dev->set_state_shutdown = hv_ce_shutdown;
bc609cb4 VK	143	dev->set_state_oneshot = hv_ce_set_oneshot;
4061ed9e S	144	dev->set_next_event = hv_ce_set_next_event;
	145	}
	146
2608fb65 JW	147
	148	int hv_synic_alloc(void)
	149	{
2608fb65 JW	150	int cpu;
2608fb65 JW	151
9f01ec53 S	152	hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
	153	GFP_ATOMIC);
	154	if (hv_context.hv_numa_map == NULL) {
	155	pr_err("Unable to allocate NUMA map\n");
	156	goto err;
	157	}
	158
421b8f20	159	for_each_present_cpu(cpu) {
37cdd991 SH	160	struct hv_per_cpu_context *hv_cpu
	161	= per_cpu_ptr(hv_context.cpu_context, cpu);
	162
	163	memset(hv_cpu, 0, sizeof(*hv_cpu));
37cdd991 SH	164	tasklet_init(&hv_cpu->msg_dpc,
	165	vmbus_on_msg_dpc, (unsigned long) hv_cpu);
	166
	167	hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
	168	GFP_KERNEL);
	169	if (hv_cpu->clk_evt == NULL) {
4061ed9e S	170	pr_err("Unable to allocate clock event device\n");
	171	goto err;
	172	}
37cdd991	173	hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
9f01ec53	174
37cdd991	175	hv_cpu->synic_message_page =
2608fb65	176	(void *)get_zeroed_page(GFP_ATOMIC);
37cdd991	177	if (hv_cpu->synic_message_page == NULL) {
2608fb65 JW	178	pr_err("Unable to allocate SYNIC message page\n");
	179	goto err;
	180	}
	181
37cdd991 SH	182	hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
37cdd991 SH	183	if (hv_cpu->synic_event_page == NULL) {
2608fb65 JW	184	pr_err("Unable to allocate SYNIC event page\n");
	185	goto err;
	186	}
b29ef354	187
37cdd991 SH	188	hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
37cdd991 SH	189	if (hv_cpu->post_msg_page == NULL) {
b29ef354 S	190	pr_err("Unable to allocate post msg page\n");
	191	goto err;
	192	}
3c7630d3	193
37cdd991	194	INIT_LIST_HEAD(&hv_cpu->chan_list);
2608fb65 JW	195	}
	196
	197	return 0;
	198	err:
	199	return -ENOMEM;
	200	}
	201
2608fb65 JW	202
	203	void hv_synic_free(void)
	204	{
	205	int cpu;
	206
37cdd991 SH	207	for_each_present_cpu(cpu) {
	208	struct hv_per_cpu_context *hv_cpu
	209	= per_cpu_ptr(hv_context.cpu_context, cpu);
	210
	211	if (hv_cpu->synic_event_page)
	212	free_page((unsigned long)hv_cpu->synic_event_page);
	213	if (hv_cpu->synic_message_page)
	214	free_page((unsigned long)hv_cpu->synic_message_page);
	215	if (hv_cpu->post_msg_page)
	216	free_page((unsigned long)hv_cpu->post_msg_page);
	217	}
	218
9f01ec53	219	kfree(hv_context.hv_numa_map);
2608fb65 JW	220	}
2608fb65 JW	221
3e189519	222	/*
d44890c8	223	* hv_synic_init - Initialize the Synthethic Interrupt Controller.
0831ad04 GKH	224	*
	225	* If it is already initialized by another entity (ie x2v shim), we need to
	226	* retrieve the initialized message and event pages. Otherwise, we create and
	227	* initialize the message and event pages.
	228	*/
76d36ab7	229	int hv_synic_init(unsigned int cpu)
3e7ee490	230	{
37cdd991 SH	231	struct hv_per_cpu_context *hv_cpu
37cdd991 SH	232	= per_cpu_ptr(hv_context.cpu_context, cpu);
eacb1b4d GKH	233	union hv_synic_simp simp;
eacb1b4d GKH	234	union hv_synic_siefp siefp;
b8dfb264	235	union hv_synic_sint shared_sint;
eacb1b4d	236	union hv_synic_scontrol sctrl;
917ea427	237	u64 vp_index;
a73e6b7c	238
a73e6b7c	239	/* Setup the Synic's message page */
155e4a2f	240	hv_get_simp(simp.as_uint64);
f6feebe0	241	simp.simp_enabled = 1;
37cdd991	242	simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
a73e6b7c	243	>> PAGE_SHIFT;
3e7ee490	244
155e4a2f	245	hv_set_simp(simp.as_uint64);
3e7ee490	246
a73e6b7c	247	/* Setup the Synic's event page */
8e307bf8	248	hv_get_siefp(siefp.as_uint64);
f6feebe0	249	siefp.siefp_enabled = 1;
37cdd991	250	siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
a73e6b7c HJ	251	>> PAGE_SHIFT;
a73e6b7c HJ	252
8e307bf8	253	hv_set_siefp(siefp.as_uint64);
0831ad04	254
0831ad04	255	/* Setup the shared SINT. */
37e11d5c S	256	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
37e11d5c S	257	shared_sint.as_uint64);
3e7ee490	258
b8dfb264	259	shared_sint.as_uint64 = 0;
302a3c0f	260	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
b8dfb264	261	shared_sint.masked = false;
6c248aad S	262	if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
	263	shared_sint.auto_eoi = false;
	264	else
	265	shared_sint.auto_eoi = true;
3e7ee490	266
37e11d5c S	267	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
37e11d5c S	268	shared_sint.as_uint64);
3e7ee490	269
454f18a9	270	/* Enable the global synic bit */
06d1d98a	271	hv_get_synic_state(sctrl.as_uint64);
f6feebe0	272	sctrl.enable = 1;
3e7ee490	273
06d1d98a	274	hv_set_synic_state(sctrl.as_uint64);
3e7ee490	275
6a0aaa18	276	hv_context.synic_initialized = true;
917ea427 S	277
	278	/*
	279	* Setup the mapping between Hyper-V's notion
	280	* of cpuid and Linux' notion of cpuid.
	281	* This array will be indexed using Linux cpuid.
	282	*/
7297ff0c	283	hv_get_vp_index(vp_index);
917ea427	284	hv_context.vp_index[cpu] = (u32)vp_index;
3a28fa35	285
4061ed9e S	286	/*
	287	* Register the per-cpu clockevent source.
	288	*/
	289	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
37cdd991	290	clockevents_config_and_register(hv_cpu->clk_evt,
4061ed9e S	291	HV_TIMER_FREQUENCY,
	292	HV_MIN_DELTA_TICKS,
	293	HV_MAX_MAX_DELTA_TICKS);
76d36ab7	294	return 0;
3e7ee490 HJ	295	}
3e7ee490 HJ	296
e086748c VK	297	/*
	298	* hv_synic_clockevents_cleanup - Cleanup clockevent devices
	299	*/
	300	void hv_synic_clockevents_cleanup(void)
	301	{
	302	int cpu;
	303
	304	if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
	305	return;
	306
37cdd991 SH	307	for_each_present_cpu(cpu) {
	308	struct hv_per_cpu_context *hv_cpu
	309	= per_cpu_ptr(hv_context.cpu_context, cpu);
	310
	311	clockevents_unbind_device(hv_cpu->clk_evt, cpu);
	312	}
e086748c VK	313	}
e086748c VK	314
3e189519	315	/*
d44890c8	316	* hv_synic_cleanup - Cleanup routine for hv_synic_init().
0831ad04	317	*/
76d36ab7	318	int hv_synic_cleanup(unsigned int cpu)
3e7ee490	319	{
b8dfb264	320	union hv_synic_sint shared_sint;
eacb1b4d GKH	321	union hv_synic_simp simp;
eacb1b4d GKH	322	union hv_synic_siefp siefp;
e72e7ac5	323	union hv_synic_scontrol sctrl;
523b9408 VK	324	struct vmbus_channel channel, sc;
	325	bool channel_found = false;
	326	unsigned long flags;
3e7ee490	327
6a0aaa18	328	if (!hv_context.synic_initialized)
76d36ab7	329	return -EFAULT;
3e7ee490	330
523b9408 VK	331	/*
	332	* Search for channels which are bound to the CPU we're about to
	333	* cleanup. In case we find one and vmbus is still connected we need to
	334	* fail, this will effectively prevent CPU offlining. There is no way
	335	* we can re-bind channels to different CPUs for now.
	336	*/
	337	mutex_lock(&vmbus_connection.channel_mutex);
	338	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
	339	if (channel->target_cpu == cpu) {
	340	channel_found = true;
	341	break;
	342	}
	343	spin_lock_irqsave(&channel->lock, flags);
	344	list_for_each_entry(sc, &channel->sc_list, sc_list) {
	345	if (sc->target_cpu == cpu) {
	346	channel_found = true;
	347	break;
	348	}
	349	}
	350	spin_unlock_irqrestore(&channel->lock, flags);
	351	if (channel_found)
	352	break;
	353	}
	354	mutex_unlock(&vmbus_connection.channel_mutex);
	355
	356	if (channel_found && vmbus_connection.conn_state == CONNECTED)
	357	return -EBUSY;
	358
e086748c	359	/* Turn off clockevent device */
6ffc4b85	360	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
37cdd991 SH	361	struct hv_per_cpu_context *hv_cpu
	362	= this_cpu_ptr(hv_context.cpu_context);
	363
	364	clockevents_unbind_device(hv_cpu->clk_evt, cpu);
	365	hv_ce_shutdown(hv_cpu->clk_evt);
	366	put_cpu_ptr(hv_cpu);
6ffc4b85	367	}
e086748c	368
37e11d5c S	369	hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
37e11d5c S	370	shared_sint.as_uint64);
3e7ee490	371
b8dfb264	372	shared_sint.masked = 1;
3e7ee490	373
7692fd4d	374	/* Need to correctly cleanup in the case of SMP!!! */
454f18a9	375	/* Disable the interrupt */
37e11d5c S	376	hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
37e11d5c S	377	shared_sint.as_uint64);
3e7ee490	378
155e4a2f	379	hv_get_simp(simp.as_uint64);
f6feebe0 HZ	380	simp.simp_enabled = 0;
f6feebe0 HZ	381	simp.base_simp_gpa = 0;
3e7ee490	382
155e4a2f	383	hv_set_simp(simp.as_uint64);
3e7ee490	384
8e307bf8	385	hv_get_siefp(siefp.as_uint64);
f6feebe0 HZ	386	siefp.siefp_enabled = 0;
f6feebe0 HZ	387	siefp.base_siefp_gpa = 0;
3e7ee490	388
8e307bf8	389	hv_set_siefp(siefp.as_uint64);
3e7ee490	390
e72e7ac5	391	/* Disable the global synic bit */
06d1d98a	392	hv_get_synic_state(sctrl.as_uint64);
e72e7ac5	393	sctrl.enable = 0;
06d1d98a	394	hv_set_synic_state(sctrl.as_uint64);
76d36ab7 VK	395
76d36ab7 VK	396	return 0;
3e7ee490	397	}