[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 <asm/hyperv.h>
#include "hyperv_vmbus.h"

/* The one and only */
struct hv_context hv_context = {
	.synic_initialized	= false,
	.hypercall_page		= NULL,
};

/*
 * query_hypervisor_info - Get version info of the windows hypervisor
 */
unsigned int host_info_eax;
unsigned int host_info_ebx;
unsigned int host_info_ecx;
unsigned int host_info_edx;

static int query_hypervisor_info(void)
{
	unsigned int eax;
	unsigned int ebx;
	unsigned int ecx;
	unsigned int edx;
	unsigned int max_leaf;
	unsigned int op;

	/*
	* Its assumed that this is called after confirming that Viridian
	* is present. Query id and revision.
	*/
	eax = 0;
	ebx = 0;
	ecx = 0;
	edx = 0;
	op = HVCPUID_VENDOR_MAXFUNCTION;
	cpuid(op, &eax, &ebx, &ecx, &edx);

	max_leaf = eax;

	if (max_leaf >= HVCPUID_VERSION) {
		eax = 0;
		ebx = 0;
		ecx = 0;
		edx = 0;
		op = HVCPUID_VERSION;
		cpuid(op, &eax, &ebx, &ecx, &edx);
		host_info_eax = eax;
		host_info_ebx = ebx;
		host_info_ecx = ecx;
		host_info_edx = edx;
	}
	return max_leaf;
}

/*
 * do_hypercall- Invoke the specified hypercall
 */
static u64 do_hypercall(u64 control, void *input, void *output)
{
#ifdef CONFIG_X86_64
	u64 hv_status = 0;
	u64 input_address = (input) ? virt_to_phys(input) : 0;
	u64 output_address = (output) ? virt_to_phys(output) : 0;
	void *hypercall_page = hv_context.hypercall_page;

	__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
	__asm__ __volatile__("call *%3" : "=a" (hv_status) :
			     "c" (control), "d" (input_address),
			     "m" (hypercall_page));

	return hv_status;

#else

	u32 control_hi = control >> 32;
	u32 control_lo = control & 0xFFFFFFFF;
	u32 hv_status_hi = 1;
	u32 hv_status_lo = 1;
	u64 input_address = (input) ? virt_to_phys(input) : 0;
	u32 input_address_hi = input_address >> 32;
	u32 input_address_lo = input_address & 0xFFFFFFFF;
	u64 output_address = (output) ? virt_to_phys(output) : 0;
	u32 output_address_hi = output_address >> 32;
	u32 output_address_lo = output_address & 0xFFFFFFFF;
	void *hypercall_page = hv_context.hypercall_page;

	__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
			      "=a"(hv_status_lo) : "d" (control_hi),
			      "a" (control_lo), "b" (input_address_hi),
			      "c" (input_address_lo), "D"(output_address_hi),
			      "S"(output_address_lo), "m" (hypercall_page));

	return hv_status_lo | ((u64)hv_status_hi << 32);
#endif /* !x86_64 */
}

/*
 * hv_init - Main initialization routine.
 *
 * This routine must be called before any other routines in here are called
 */
int hv_init(void)
{
	int max_leaf;
	union hv_x64_msr_hypercall_contents hypercall_msr;
	void *virtaddr = NULL;

	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.vp_index, 0,
	       sizeof(int) * NR_CPUS);
	memset(hv_context.event_dpc, 0,
	       sizeof(void *) * NR_CPUS);

	max_leaf = query_hypervisor_info();

	/*
	 * Write our OS ID.
	 */
	hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
	wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);

	/* See if the hypercall page is already set */
	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

	virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);

	if (!virtaddr)
		goto cleanup;

	hypercall_msr.enable = 1;

	hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

	/* Confirm that hypercall page did get setup. */
	hypercall_msr.as_uint64 = 0;
	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

	if (!hypercall_msr.enable)
		goto cleanup;

	hv_context.hypercall_page = virtaddr;

	return 0;

cleanup:
	if (virtaddr) {
		if (hypercall_msr.enable) {
			hypercall_msr.as_uint64 = 0;
			wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
		}

		vfree(virtaddr);
	}

	return -ENOTSUPP;
}

/*
 * hv_cleanup - Cleanup routine.
 *
 * This routine is called normally during driver unloading or exiting.
 */
void hv_cleanup(void)
{
	union hv_x64_msr_hypercall_contents hypercall_msr;

	/* Reset our OS id */
	wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);

	if (hv_context.hypercall_page) {
		hypercall_msr.as_uint64 = 0;
		wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
		vfree(hv_context.hypercall_page);
		hv_context.hypercall_page = NULL;
	}
}

/*
 * 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 aligned_input {
		u64 alignment8;
		struct hv_input_post_message msg;
	};

	struct hv_input_post_message *aligned_msg;
	u16 status;
	unsigned long addr;

	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
		return -EMSGSIZE;

	addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
	if (!addr)
		return -ENOMEM;

	aligned_msg = (struct hv_input_post_message *)
			(ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));

	aligned_msg->connectionid = connection_id;
	aligned_msg->message_type = message_type;
	aligned_msg->payload_size = payload_size;
	memcpy((void *)aligned_msg->payload, payload, payload_size);

	status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
		& 0xFFFF;

	kfree((void *)addr);

	return status;
}


/*
 * hv_signal_event -
 * Signal an event on the specified connection using the hypervisor event IPC.
 *
 * This involves a hypercall.
 */
u16 hv_signal_event(void *con_id)
{
	u16 status;

	status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);

	return status;
}


int hv_synic_alloc(void)
{
	size_t size = sizeof(struct tasklet_struct);
	int cpu;

	for_each_online_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.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;
		}
	}

	return 0;
err:
	return -ENOMEM;
}

void hv_synic_free_cpu(int cpu)
{
	kfree(hv_context.event_dpc[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]);
}

void hv_synic_free(void)
{
	int cpu;

	for_each_online_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.
 */
void hv_synic_init(void *arg)
{
	u64 version;
	union hv_synic_simp simp;
	union hv_synic_siefp siefp;
	union hv_synic_sint shared_sint;
	union hv_synic_scontrol sctrl;
	u64 vp_index;

	int cpu = smp_processor_id();

	if (!hv_context.hypercall_page)
		return;

	/* Check the version */
	rdmsrl(HV_X64_MSR_SVERSION, version);

	/* Setup the Synic's message page */
	rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
	simp.simp_enabled = 1;
	simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
		>> PAGE_SHIFT;

	wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);

	/* Setup the Synic's event page */
	rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
	siefp.siefp_enabled = 1;
	siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
		>> PAGE_SHIFT;

	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);

	/* Setup the shared SINT. */
	rdmsrl(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;

	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);

	/* Enable the global synic bit */
	rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
	sctrl.enable = 1;

	wrmsrl(HV_X64_MSR_SCONTROL, 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.
	 */
	rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
	hv_context.vp_index[cpu] = (u32)vp_index;
	return;
}

/*
 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
 */
void hv_synic_cleanup(void *arg)
{
	union hv_synic_sint shared_sint;
	union hv_synic_simp simp;
	union hv_synic_siefp siefp;
	int cpu = smp_processor_id();

	if (!hv_context.synic_initialized)
		return;

	rdmsrl(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 */
	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);

	rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
	simp.simp_enabled = 0;
	simp.base_simp_gpa = 0;

	wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);

	rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
	siefp.siefp_enabled = 0;
	siefp.base_siefp_gpa = 0;

	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);

	free_page((unsigned long)hv_context.synic_message_page[cpu]);
	free_page((unsigned long)hv_context.synic_event_page[cpu]);
}
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>
407dd164	31	#include <asm/hyperv.h>
0f2a6619	32	#include "hyperv_vmbus.h"
3e7ee490	33
454f18a9	34	/* The one and only */
6a0aaa18 HZ	35	struct hv_context hv_context = {
	36	.synic_initialized = false,
	37	.hypercall_page = NULL,
3e7ee490 HJ	38	};
3e7ee490 HJ	39
3e189519	40	/*
d44890c8	41	* query_hypervisor_info - Get version info of the windows hypervisor
0831ad04	42	*/
5fbebb2d S	43	unsigned int host_info_eax;
	44	unsigned int host_info_ebx;
	45	unsigned int host_info_ecx;
	46	unsigned int host_info_edx;
	47
d44890c8	48	static int query_hypervisor_info(void)
0831ad04 GKH	49	{
	50	unsigned int eax;
	51	unsigned int ebx;
	52	unsigned int ecx;
	53	unsigned int edx;
b8dfb264	54	unsigned int max_leaf;
0831ad04	55	unsigned int op;
3e7ee490	56
0831ad04 GKH	57	/*
	58	* Its assumed that this is called after confirming that Viridian
	59	* is present. Query id and revision.
	60	*/
	61	eax = 0;
	62	ebx = 0;
	63	ecx = 0;
	64	edx = 0;
f6feebe0	65	op = HVCPUID_VENDOR_MAXFUNCTION;
0831ad04	66	cpuid(op, &eax, &ebx, &ecx, &edx);
3e7ee490	67
b8dfb264	68	max_leaf = eax;
0831ad04	69
b8dfb264	70	if (max_leaf >= HVCPUID_VERSION) {
0831ad04 GKH	71	eax = 0;
	72	ebx = 0;
	73	ecx = 0;
	74	edx = 0;
f6feebe0	75	op = HVCPUID_VERSION;
0831ad04	76	cpuid(op, &eax, &ebx, &ecx, &edx);
5fbebb2d S	77	host_info_eax = eax;
	78	host_info_ebx = ebx;
	79	host_info_ecx = ecx;
	80	host_info_edx = edx;
0831ad04	81	}
b8dfb264	82	return max_leaf;
0831ad04	83	}
3e7ee490	84
3e189519	85	/*
d44890c8	86	* do_hypercall- Invoke the specified hypercall
0831ad04	87	*/
d44890c8	88	static u64 do_hypercall(u64 control, void input, void output)
3e7ee490	89	{
530cf207	90	#ifdef CONFIG_X86_64
b8dfb264 HZ	91	u64 hv_status = 0;
	92	u64 input_address = (input) ? virt_to_phys(input) : 0;
	93	u64 output_address = (output) ? virt_to_phys(output) : 0;
dec317fd	94	void *hypercall_page = hv_context.hypercall_page;
3e7ee490	95
b8dfb264 HZ	96	__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
	97	__asm__ __volatile__("call *%3" : "=a" (hv_status) :
	98	"c" (control), "d" (input_address),
	99	"m" (hypercall_page));
3e7ee490	100
b8dfb264	101	return hv_status;
3e7ee490 HJ	102
	103	#else
	104
b8dfb264 HZ	105	u32 control_hi = control >> 32;
	106	u32 control_lo = control & 0xFFFFFFFF;
	107	u32 hv_status_hi = 1;
	108	u32 hv_status_lo = 1;
	109	u64 input_address = (input) ? virt_to_phys(input) : 0;
	110	u32 input_address_hi = input_address >> 32;
	111	u32 input_address_lo = input_address & 0xFFFFFFFF;
	112	u64 output_address = (output) ? virt_to_phys(output) : 0;
	113	u32 output_address_hi = output_address >> 32;
	114	u32 output_address_lo = output_address & 0xFFFFFFFF;
dec317fd	115	void *hypercall_page = hv_context.hypercall_page;
3e7ee490	116
b8dfb264 HZ	117	__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
	118	"=a"(hv_status_lo) : "d" (control_hi),
	119	"a" (control_lo), "b" (input_address_hi),
	120	"c" (input_address_lo), "D"(output_address_hi),
	121	"S"(output_address_lo), "m" (hypercall_page));
3e7ee490	122
b8dfb264	123	return hv_status_lo \| ((u64)hv_status_hi << 32);
0831ad04	124	#endif /* !x86_64 */
3e7ee490 HJ	125	}
3e7ee490 HJ	126
3e189519	127	/*
d44890c8	128	* hv_init - Main initialization routine.
0831ad04 GKH	129	*
	130	* This routine must be called before any other routines in here are called
	131	*/
d44890c8	132	int hv_init(void)
3e7ee490	133	{
b8dfb264 HZ	134	int max_leaf;
	135	union hv_x64_msr_hypercall_contents hypercall_msr;
	136	void *virtaddr = NULL;
3e7ee490	137
14c1bf8a	138	memset(hv_context.synic_event_page, 0, sizeof(void ) NR_CPUS);
6a0aaa18	139	memset(hv_context.synic_message_page, 0,
14c1bf8a	140	sizeof(void ) NR_CPUS);
917ea427 S	141	memset(hv_context.vp_index, 0,
917ea427 S	142	sizeof(int) * NR_CPUS);
db11f12a S	143	memset(hv_context.event_dpc, 0,
db11f12a S	144	sizeof(void ) NR_CPUS);
3e7ee490	145
d44890c8	146	max_leaf = query_hypervisor_info();
3e7ee490	147
83ba0c4f S	148	/*
	149	* Write our OS ID.
	150	*/
	151	hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
	152	wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
a73e6b7c	153
454f18a9	154	/* See if the hypercall page is already set */
b8dfb264	155	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
3e7ee490	156
df3493e0	157	virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
3e7ee490	158
98e08702	159	if (!virtaddr)
44939d37	160	goto cleanup;
3e7ee490	161
b8dfb264	162	hypercall_msr.enable = 1;
a73e6b7c	163
b8dfb264 HZ	164	hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
b8dfb264 HZ	165	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
a73e6b7c HJ	166
a73e6b7c HJ	167	/* Confirm that hypercall page did get setup. */
b8dfb264 HZ	168	hypercall_msr.as_uint64 = 0;
b8dfb264 HZ	169	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
a73e6b7c	170
98e08702	171	if (!hypercall_msr.enable)
44939d37	172	goto cleanup;
3e7ee490	173
b8dfb264	174	hv_context.hypercall_page = virtaddr;
a73e6b7c	175
5433e003	176	return 0;
3e7ee490	177
44939d37	178	cleanup:
b8dfb264 HZ	179	if (virtaddr) {
	180	if (hypercall_msr.enable) {
	181	hypercall_msr.as_uint64 = 0;
	182	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
3e7ee490 HJ	183	}
3e7ee490 HJ	184
b8dfb264	185	vfree(virtaddr);
3e7ee490	186	}
5433e003 S	187
5433e003 S	188	return -ENOTSUPP;
3e7ee490 HJ	189	}
3e7ee490 HJ	190
3e189519	191	/*
d44890c8	192	* hv_cleanup - Cleanup routine.
0831ad04 GKH	193	*
	194	* This routine is called normally during driver unloading or exiting.
	195	*/
d44890c8	196	void hv_cleanup(void)
3e7ee490	197	{
b8dfb264	198	union hv_x64_msr_hypercall_contents hypercall_msr;
3e7ee490	199
93e5bd06 S	200	/* Reset our OS id */
	201	wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
	202
6a0aaa18	203	if (hv_context.hypercall_page) {
b8dfb264 HZ	204	hypercall_msr.as_uint64 = 0;
b8dfb264 HZ	205	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
6a0aaa18 HZ	206	vfree(hv_context.hypercall_page);
6a0aaa18 HZ	207	hv_context.hypercall_page = NULL;
3e7ee490	208	}
3e7ee490 HJ	209	}
3e7ee490 HJ	210
3e189519	211	/*
d44890c8	212	* hv_post_message - Post a message using the hypervisor message IPC.
0831ad04 GKH	213	*
	214	* This involves a hypercall.
	215	*/
415f0a02	216	int hv_post_message(union hv_connection_id connection_id,
b8dfb264 HZ	217	enum hv_message_type message_type,
b8dfb264 HZ	218	void *payload, size_t payload_size)
3e7ee490	219	{
b8dfb264	220	struct aligned_input {
0831ad04	221	u64 alignment8;
cba4decd	222	struct hv_input_post_message msg;
3e7ee490 HJ	223	};
3e7ee490 HJ	224
b8dfb264	225	struct hv_input_post_message *aligned_msg;
034469e6	226	u16 status;
c4b0bc94	227	unsigned long addr;
3e7ee490	228
b8dfb264	229	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
39594abc	230	return -EMSGSIZE;
3e7ee490	231
b8dfb264	232	addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
3e7ee490	233	if (!addr)
39594abc	234	return -ENOMEM;
3e7ee490	235
b8dfb264	236	aligned_msg = (struct hv_input_post_message *)
73509681	237	(ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
3e7ee490	238
b8dfb264 HZ	239	aligned_msg->connectionid = connection_id;
	240	aligned_msg->message_type = message_type;
	241	aligned_msg->payload_size = payload_size;
	242	memcpy((void *)aligned_msg->payload, payload, payload_size);
3e7ee490	243
d44890c8 HZ	244	status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
d44890c8 HZ	245	& 0xFFFF;
3e7ee490	246
0831ad04	247	kfree((void *)addr);
3e7ee490 HJ	248
	249	return status;
	250	}
	251
	252
3e189519	253	/*
d44890c8 HZ	254	* hv_signal_event -
d44890c8 HZ	255	* Signal an event on the specified connection using the hypervisor event IPC.
0831ad04 GKH	256	*
	257	* This involves a hypercall.
	258	*/
1f42248d	259	u16 hv_signal_event(void *con_id)
3e7ee490	260	{
034469e6	261	u16 status;
3e7ee490	262
1f42248d S	263	status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
1f42248d S	264
3e7ee490 HJ	265	return status;
	266	}
	267
2608fb65 JW	268
	269	int hv_synic_alloc(void)
	270	{
	271	size_t size = sizeof(struct tasklet_struct);
	272	int cpu;
	273
	274	for_each_online_cpu(cpu) {
	275	hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
	276	if (hv_context.event_dpc[cpu] == NULL) {
	277	pr_err("Unable to allocate event dpc\n");
	278	goto err;
	279	}
	280	tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
	281
	282	hv_context.synic_message_page[cpu] =
	283	(void *)get_zeroed_page(GFP_ATOMIC);
	284
	285	if (hv_context.synic_message_page[cpu] == NULL) {
	286	pr_err("Unable to allocate SYNIC message page\n");
	287	goto err;
	288	}
	289
	290	hv_context.synic_event_page[cpu] =
	291	(void *)get_zeroed_page(GFP_ATOMIC);
	292
	293	if (hv_context.synic_event_page[cpu] == NULL) {
	294	pr_err("Unable to allocate SYNIC event page\n");
	295	goto err;
	296	}
	297	}
	298
	299	return 0;
	300	err:
	301	return -ENOMEM;
	302	}
	303
	304	void hv_synic_free_cpu(int cpu)
	305	{
	306	kfree(hv_context.event_dpc[cpu]);
fdf91dae	307	if (hv_context.synic_event_page[cpu])
2608fb65 JW	308	free_page((unsigned long)hv_context.synic_event_page[cpu]);
	309	if (hv_context.synic_message_page[cpu])
	310	free_page((unsigned long)hv_context.synic_message_page[cpu]);
	311	}
	312
	313	void hv_synic_free(void)
	314	{
	315	int cpu;
	316
	317	for_each_online_cpu(cpu)
	318	hv_synic_free_cpu(cpu);
	319	}
	320
3e189519	321	/*
d44890c8	322	* hv_synic_init - Initialize the Synthethic Interrupt Controller.
0831ad04 GKH	323	*
	324	* If it is already initialized by another entity (ie x2v shim), we need to
	325	* retrieve the initialized message and event pages. Otherwise, we create and
	326	* initialize the message and event pages.
	327	*/
302a3c0f	328	void hv_synic_init(void *arg)
3e7ee490	329	{
0831ad04	330	u64 version;
eacb1b4d GKH	331	union hv_synic_simp simp;
eacb1b4d GKH	332	union hv_synic_siefp siefp;
b8dfb264	333	union hv_synic_sint shared_sint;
eacb1b4d	334	union hv_synic_scontrol sctrl;
917ea427	335	u64 vp_index;
a73e6b7c	336
7692fd4d	337	int cpu = smp_processor_id();
3e7ee490	338
6a0aaa18	339	if (!hv_context.hypercall_page)
7692fd4d	340	return;
3e7ee490	341
454f18a9	342	/* Check the version */
a51ed7d6	343	rdmsrl(HV_X64_MSR_SVERSION, version);
3e7ee490	344
a73e6b7c	345	/* Setup the Synic's message page */
f6feebe0 HZ	346	rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
f6feebe0 HZ	347	simp.simp_enabled = 1;
6a0aaa18	348	simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
a73e6b7c	349	>> PAGE_SHIFT;
3e7ee490	350
f6feebe0	351	wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
3e7ee490	352
a73e6b7c	353	/* Setup the Synic's event page */
f6feebe0 HZ	354	rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
f6feebe0 HZ	355	siefp.siefp_enabled = 1;
6a0aaa18	356	siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
a73e6b7c HJ	357	>> PAGE_SHIFT;
a73e6b7c HJ	358
f6feebe0	359	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
0831ad04	360
0831ad04	361	/* Setup the shared SINT. */
b8dfb264	362	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	363
b8dfb264	364	shared_sint.as_uint64 = 0;
302a3c0f	365	shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
b8dfb264	366	shared_sint.masked = false;
b0209501	367	shared_sint.auto_eoi = true;
3e7ee490	368
b8dfb264	369	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	370
454f18a9	371	/* Enable the global synic bit */
f6feebe0 HZ	372	rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
f6feebe0 HZ	373	sctrl.enable = 1;
3e7ee490	374
f6feebe0	375	wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
3e7ee490	376
6a0aaa18	377	hv_context.synic_initialized = true;
917ea427 S	378
	379	/*
	380	* Setup the mapping between Hyper-V's notion
	381	* of cpuid and Linux' notion of cpuid.
	382	* This array will be indexed using Linux cpuid.
	383	*/
	384	rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
	385	hv_context.vp_index[cpu] = (u32)vp_index;
7692fd4d	386	return;
3e7ee490 HJ	387	}
3e7ee490 HJ	388
3e189519	389	/*
d44890c8	390	* hv_synic_cleanup - Cleanup routine for hv_synic_init().
0831ad04	391	*/
d44890c8	392	void hv_synic_cleanup(void *arg)
3e7ee490	393	{
b8dfb264	394	union hv_synic_sint shared_sint;
eacb1b4d GKH	395	union hv_synic_simp simp;
eacb1b4d GKH	396	union hv_synic_siefp siefp;
7692fd4d	397	int cpu = smp_processor_id();
3e7ee490	398
6a0aaa18	399	if (!hv_context.synic_initialized)
3e7ee490	400	return;
3e7ee490	401
b8dfb264	402	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	403
b8dfb264	404	shared_sint.masked = 1;
3e7ee490	405
7692fd4d	406	/* Need to correctly cleanup in the case of SMP!!! */
454f18a9	407	/* Disable the interrupt */
b8dfb264	408	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	409
f6feebe0 HZ	410	rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
	411	simp.simp_enabled = 0;
	412	simp.base_simp_gpa = 0;
3e7ee490	413
f6feebe0	414	wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
3e7ee490	415
f6feebe0 HZ	416	rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
	417	siefp.siefp_enabled = 0;
	418	siefp.base_siefp_gpa = 0;
3e7ee490	419
f6feebe0	420	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
3e7ee490	421
df3493e0 S	422	free_page((unsigned long)hv_context.synic_message_page[cpu]);
df3493e0 S	423	free_page((unsigned long)hv_context.synic_event_page[cpu]);
3e7ee490	424	}