[mirror_ubuntu-bionic-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);
	put_cpu_ptr(hv_cpu);

	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);

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