[deliverable/linux.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
 */
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);
		pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n",
			    eax,
			    ebx >> 16,
			    ebx & 0xFFFF,
			    ecx,
			    edx >> 24,
			    edx & 0xFFFFFF);
	}
	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;
}

/*
 * 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 *irqarg)
{
	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;

	u32 irq_vector = *((u32 *)(irqarg));
	int cpu = smp_processor_id();

	if (!hv_context.hypercall_page)
		return;

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

	hv_context.event_dpc[cpu] = (struct tasklet_struct *)
					kmalloc(sizeof(struct tasklet_struct),
						GFP_ATOMIC);
	if (hv_context.event_dpc[cpu] == NULL) {
		pr_err("Unable to allocate event dpc\n");
		goto cleanup;
	}
	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 cleanup;
	}

	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 cleanup;
	}

	/* 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 = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
	shared_sint.masked = false;
	shared_sint.auto_eoi = false;

	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;

cleanup:
	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]);
	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	*/
d44890c8	43	static int query_hypervisor_info(void)
0831ad04 GKH	44	{
	45	unsigned int eax;
	46	unsigned int ebx;
	47	unsigned int ecx;
	48	unsigned int edx;
b8dfb264	49	unsigned int max_leaf;
0831ad04	50	unsigned int op;
3e7ee490	51
0831ad04 GKH	52	/*
	53	* Its assumed that this is called after confirming that Viridian
	54	* is present. Query id and revision.
	55	*/
	56	eax = 0;
	57	ebx = 0;
	58	ecx = 0;
	59	edx = 0;
f6feebe0	60	op = HVCPUID_VENDOR_MAXFUNCTION;
0831ad04	61	cpuid(op, &eax, &ebx, &ecx, &edx);
3e7ee490	62
b8dfb264	63	max_leaf = eax;
0831ad04	64
b8dfb264	65	if (max_leaf >= HVCPUID_VERSION) {
0831ad04 GKH	66	eax = 0;
	67	ebx = 0;
	68	ecx = 0;
	69	edx = 0;
f6feebe0	70	op = HVCPUID_VERSION;
0831ad04	71	cpuid(op, &eax, &ebx, &ecx, &edx);
0a46618d	72	pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n",
0831ad04 GKH	73	eax,
	74	ebx >> 16,
	75	ebx & 0xFFFF,
	76	ecx,
	77	edx >> 24,
	78	edx & 0xFFFFFF);
	79	}
b8dfb264	80	return max_leaf;
0831ad04	81	}
3e7ee490	82
3e189519	83	/*
d44890c8	84	* do_hypercall- Invoke the specified hypercall
0831ad04	85	*/
d44890c8	86	static u64 do_hypercall(u64 control, void input, void output)
3e7ee490	87	{
530cf207	88	#ifdef CONFIG_X86_64
b8dfb264 HZ	89	u64 hv_status = 0;
	90	u64 input_address = (input) ? virt_to_phys(input) : 0;
	91	u64 output_address = (output) ? virt_to_phys(output) : 0;
dec317fd	92	void *hypercall_page = hv_context.hypercall_page;
3e7ee490	93
b8dfb264 HZ	94	__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
	95	__asm__ __volatile__("call *%3" : "=a" (hv_status) :
	96	"c" (control), "d" (input_address),
	97	"m" (hypercall_page));
3e7ee490	98
b8dfb264	99	return hv_status;
3e7ee490 HJ	100
	101	#else
	102
b8dfb264 HZ	103	u32 control_hi = control >> 32;
	104	u32 control_lo = control & 0xFFFFFFFF;
	105	u32 hv_status_hi = 1;
	106	u32 hv_status_lo = 1;
	107	u64 input_address = (input) ? virt_to_phys(input) : 0;
	108	u32 input_address_hi = input_address >> 32;
	109	u32 input_address_lo = input_address & 0xFFFFFFFF;
	110	u64 output_address = (output) ? virt_to_phys(output) : 0;
	111	u32 output_address_hi = output_address >> 32;
	112	u32 output_address_lo = output_address & 0xFFFFFFFF;
dec317fd	113	void *hypercall_page = hv_context.hypercall_page;
3e7ee490	114
b8dfb264 HZ	115	__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
	116	"=a"(hv_status_lo) : "d" (control_hi),
	117	"a" (control_lo), "b" (input_address_hi),
	118	"c" (input_address_lo), "D"(output_address_hi),
	119	"S"(output_address_lo), "m" (hypercall_page));
3e7ee490	120
b8dfb264	121	return hv_status_lo \| ((u64)hv_status_hi << 32);
0831ad04	122	#endif /* !x86_64 */
3e7ee490 HJ	123	}
3e7ee490 HJ	124
3e189519	125	/*
d44890c8	126	* hv_init - Main initialization routine.
0831ad04 GKH	127	*
	128	* This routine must be called before any other routines in here are called
	129	*/
d44890c8	130	int hv_init(void)
3e7ee490	131	{
b8dfb264 HZ	132	int max_leaf;
	133	union hv_x64_msr_hypercall_contents hypercall_msr;
	134	void *virtaddr = NULL;
3e7ee490	135
14c1bf8a	136	memset(hv_context.synic_event_page, 0, sizeof(void ) NR_CPUS);
6a0aaa18	137	memset(hv_context.synic_message_page, 0,
14c1bf8a	138	sizeof(void ) NR_CPUS);
917ea427 S	139	memset(hv_context.vp_index, 0,
917ea427 S	140	sizeof(int) * NR_CPUS);
db11f12a S	141	memset(hv_context.event_dpc, 0,
db11f12a S	142	sizeof(void ) NR_CPUS);
3e7ee490	143
d44890c8	144	max_leaf = query_hypervisor_info();
3e7ee490	145
83ba0c4f S	146	/*
	147	* Write our OS ID.
	148	*/
	149	hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
	150	wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
a73e6b7c	151
454f18a9	152	/* See if the hypercall page is already set */
b8dfb264	153	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
3e7ee490	154
df3493e0	155	virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
3e7ee490	156
98e08702	157	if (!virtaddr)
44939d37	158	goto cleanup;
3e7ee490	159
b8dfb264	160	hypercall_msr.enable = 1;
a73e6b7c	161
b8dfb264 HZ	162	hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
b8dfb264 HZ	163	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
a73e6b7c HJ	164
a73e6b7c HJ	165	/* Confirm that hypercall page did get setup. */
b8dfb264 HZ	166	hypercall_msr.as_uint64 = 0;
b8dfb264 HZ	167	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
a73e6b7c	168
98e08702	169	if (!hypercall_msr.enable)
44939d37	170	goto cleanup;
3e7ee490	171
b8dfb264	172	hv_context.hypercall_page = virtaddr;
a73e6b7c	173
5433e003	174	return 0;
3e7ee490	175
44939d37	176	cleanup:
b8dfb264 HZ	177	if (virtaddr) {
	178	if (hypercall_msr.enable) {
	179	hypercall_msr.as_uint64 = 0;
	180	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
3e7ee490 HJ	181	}
3e7ee490 HJ	182
b8dfb264	183	vfree(virtaddr);
3e7ee490	184	}
5433e003 S	185
5433e003 S	186	return -ENOTSUPP;
3e7ee490 HJ	187	}
3e7ee490 HJ	188
3e189519	189	/*
d44890c8	190	* hv_cleanup - Cleanup routine.
0831ad04 GKH	191	*
	192	* This routine is called normally during driver unloading or exiting.
	193	*/
d44890c8	194	void hv_cleanup(void)
3e7ee490	195	{
b8dfb264	196	union hv_x64_msr_hypercall_contents hypercall_msr;
3e7ee490	197
93e5bd06 S	198	/* Reset our OS id */
	199	wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
	200
6a0aaa18	201	if (hv_context.hypercall_page) {
b8dfb264 HZ	202	hypercall_msr.as_uint64 = 0;
b8dfb264 HZ	203	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
6a0aaa18 HZ	204	vfree(hv_context.hypercall_page);
6a0aaa18 HZ	205	hv_context.hypercall_page = NULL;
3e7ee490	206	}
3e7ee490 HJ	207	}
3e7ee490 HJ	208
3e189519	209	/*
d44890c8	210	* hv_post_message - Post a message using the hypervisor message IPC.
0831ad04 GKH	211	*
	212	* This involves a hypercall.
	213	*/
415f0a02	214	int hv_post_message(union hv_connection_id connection_id,
b8dfb264 HZ	215	enum hv_message_type message_type,
b8dfb264 HZ	216	void *payload, size_t payload_size)
3e7ee490	217	{
b8dfb264	218	struct aligned_input {
0831ad04	219	u64 alignment8;
cba4decd	220	struct hv_input_post_message msg;
3e7ee490 HJ	221	};
3e7ee490 HJ	222
b8dfb264	223	struct hv_input_post_message *aligned_msg;
034469e6	224	u16 status;
c4b0bc94	225	unsigned long addr;
3e7ee490	226
b8dfb264	227	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
39594abc	228	return -EMSGSIZE;
3e7ee490	229
b8dfb264	230	addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
3e7ee490	231	if (!addr)
39594abc	232	return -ENOMEM;
3e7ee490	233
b8dfb264	234	aligned_msg = (struct hv_input_post_message *)
73509681	235	(ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
3e7ee490	236
b8dfb264 HZ	237	aligned_msg->connectionid = connection_id;
	238	aligned_msg->message_type = message_type;
	239	aligned_msg->payload_size = payload_size;
	240	memcpy((void *)aligned_msg->payload, payload, payload_size);
3e7ee490	241
d44890c8 HZ	242	status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
d44890c8 HZ	243	& 0xFFFF;
3e7ee490	244
0831ad04	245	kfree((void *)addr);
3e7ee490 HJ	246
	247	return status;
	248	}
	249
	250
3e189519	251	/*
d44890c8 HZ	252	* hv_signal_event -
d44890c8 HZ	253	* Signal an event on the specified connection using the hypervisor event IPC.
0831ad04 GKH	254	*
	255	* This involves a hypercall.
	256	*/
1f42248d	257	u16 hv_signal_event(void *con_id)
3e7ee490	258	{
034469e6	259	u16 status;
3e7ee490	260
1f42248d S	261	status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
1f42248d S	262
3e7ee490 HJ	263	return status;
	264	}
	265
3e189519	266	/*
d44890c8	267	* hv_synic_init - Initialize the Synthethic Interrupt Controller.
0831ad04 GKH	268	*
	269	* If it is already initialized by another entity (ie x2v shim), we need to
	270	* retrieve the initialized message and event pages. Otherwise, we create and
	271	* initialize the message and event pages.
	272	*/
d44890c8	273	void hv_synic_init(void *irqarg)
3e7ee490	274	{
0831ad04	275	u64 version;
eacb1b4d GKH	276	union hv_synic_simp simp;
eacb1b4d GKH	277	union hv_synic_siefp siefp;
b8dfb264	278	union hv_synic_sint shared_sint;
eacb1b4d	279	union hv_synic_scontrol sctrl;
917ea427	280	u64 vp_index;
a73e6b7c	281
b8dfb264	282	u32 irq_vector = ((u32 )(irqarg));
7692fd4d	283	int cpu = smp_processor_id();
3e7ee490	284
6a0aaa18	285	if (!hv_context.hypercall_page)
7692fd4d	286	return;
3e7ee490	287
454f18a9	288	/* Check the version */
a51ed7d6	289	rdmsrl(HV_X64_MSR_SVERSION, version);
3e7ee490	290
db11f12a S	291	hv_context.event_dpc[cpu] = (struct tasklet_struct *)
	292	kmalloc(sizeof(struct tasklet_struct),
	293	GFP_ATOMIC);
	294	if (hv_context.event_dpc[cpu] == NULL) {
	295	pr_err("Unable to allocate event dpc\n");
	296	goto cleanup;
	297	}
	298	tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
	299
6a0aaa18 HZ	300	hv_context.synic_message_page[cpu] =
6a0aaa18 HZ	301	(void *)get_zeroed_page(GFP_ATOMIC);
3e7ee490	302
6a0aaa18	303	if (hv_context.synic_message_page[cpu] == NULL) {
0a46618d	304	pr_err("Unable to allocate SYNIC message page\n");
44939d37	305	goto cleanup;
a73e6b7c	306	}
3e7ee490	307
6a0aaa18 HZ	308	hv_context.synic_event_page[cpu] =
6a0aaa18 HZ	309	(void *)get_zeroed_page(GFP_ATOMIC);
3e7ee490	310
6a0aaa18	311	if (hv_context.synic_event_page[cpu] == NULL) {
0a46618d	312	pr_err("Unable to allocate SYNIC event page\n");
44939d37	313	goto cleanup;
a73e6b7c	314	}
3e7ee490	315
a73e6b7c	316	/* Setup the Synic's message page */
f6feebe0 HZ	317	rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
f6feebe0 HZ	318	simp.simp_enabled = 1;
6a0aaa18	319	simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
a73e6b7c	320	>> PAGE_SHIFT;
3e7ee490	321
f6feebe0	322	wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
3e7ee490	323
a73e6b7c	324	/* Setup the Synic's event page */
f6feebe0 HZ	325	rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
f6feebe0 HZ	326	siefp.siefp_enabled = 1;
6a0aaa18	327	siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
a73e6b7c HJ	328	>> PAGE_SHIFT;
a73e6b7c HJ	329
f6feebe0	330	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
0831ad04	331
0831ad04	332	/* Setup the shared SINT. */
b8dfb264	333	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	334
b8dfb264 HZ	335	shared_sint.as_uint64 = 0;
	336	shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
	337	shared_sint.masked = false;
93511baa	338	shared_sint.auto_eoi = false;
3e7ee490	339
b8dfb264	340	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	341
454f18a9	342	/* Enable the global synic bit */
f6feebe0 HZ	343	rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
f6feebe0 HZ	344	sctrl.enable = 1;
3e7ee490	345
f6feebe0	346	wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
3e7ee490	347
6a0aaa18	348	hv_context.synic_initialized = true;
917ea427 S	349
	350	/*
	351	* Setup the mapping between Hyper-V's notion
	352	* of cpuid and Linux' notion of cpuid.
	353	* This array will be indexed using Linux cpuid.
	354	*/
	355	rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
	356	hv_context.vp_index[cpu] = (u32)vp_index;
7692fd4d	357	return;
3e7ee490	358
44939d37	359	cleanup:
6a0aaa18	360	if (hv_context.synic_event_page[cpu])
df3493e0	361	free_page((unsigned long)hv_context.synic_event_page[cpu]);
3e7ee490	362
6a0aaa18	363	if (hv_context.synic_message_page[cpu])
df3493e0	364	free_page((unsigned long)hv_context.synic_message_page[cpu]);
7692fd4d	365	return;
3e7ee490 HJ	366	}
3e7ee490 HJ	367
3e189519	368	/*
d44890c8	369	* hv_synic_cleanup - Cleanup routine for hv_synic_init().
0831ad04	370	*/
d44890c8	371	void hv_synic_cleanup(void *arg)
3e7ee490	372	{
b8dfb264	373	union hv_synic_sint shared_sint;
eacb1b4d GKH	374	union hv_synic_simp simp;
eacb1b4d GKH	375	union hv_synic_siefp siefp;
7692fd4d	376	int cpu = smp_processor_id();
3e7ee490	377
6a0aaa18	378	if (!hv_context.synic_initialized)
3e7ee490	379	return;
3e7ee490	380
b8dfb264	381	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	382
b8dfb264	383	shared_sint.masked = 1;
3e7ee490	384
7692fd4d	385	/* Need to correctly cleanup in the case of SMP!!! */
454f18a9	386	/* Disable the interrupt */
b8dfb264	387	wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
3e7ee490	388
f6feebe0 HZ	389	rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
	390	simp.simp_enabled = 0;
	391	simp.base_simp_gpa = 0;
3e7ee490	392
f6feebe0	393	wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
3e7ee490	394
f6feebe0 HZ	395	rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
	396	siefp.siefp_enabled = 0;
	397	siefp.base_siefp_gpa = 0;
3e7ee490	398
f6feebe0	399	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
3e7ee490	400
df3493e0 S	401	free_page((unsigned long)hv_context.synic_message_page[cpu]);
df3493e0 S	402	free_page((unsigned long)hv_context.synic_event_page[cpu]);
3e7ee490	403	}