linux/audit.h: move ptrace.h include to kernel header
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hv / hv.c
blob3648f8f0f36886282da6abf3bb2df05a355d3001
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
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.
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.
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.
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/hyperv.h>
29 #include <linux/version.h>
30 #include <asm/hyperv.h>
31 #include "hyperv_vmbus.h"
33 /* The one and only */
34 struct hv_context hv_context = {
35 .synic_initialized = false,
36 .hypercall_page = NULL,
37 .signal_event_param = NULL,
38 .signal_event_buffer = NULL,
42 * query_hypervisor_info - Get version info of the windows hypervisor
44 static int query_hypervisor_info(void)
46 unsigned int eax;
47 unsigned int ebx;
48 unsigned int ecx;
49 unsigned int edx;
50 unsigned int max_leaf;
51 unsigned int op;
54 * Its assumed that this is called after confirming that Viridian
55 * is present. Query id and revision.
57 eax = 0;
58 ebx = 0;
59 ecx = 0;
60 edx = 0;
61 op = HVCPUID_VENDOR_MAXFUNCTION;
62 cpuid(op, &eax, &ebx, &ecx, &edx);
64 max_leaf = eax;
66 if (max_leaf >= HVCPUID_VERSION) {
67 eax = 0;
68 ebx = 0;
69 ecx = 0;
70 edx = 0;
71 op = HVCPUID_VERSION;
72 cpuid(op, &eax, &ebx, &ecx, &edx);
73 pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n",
74 eax,
75 ebx >> 16,
76 ebx & 0xFFFF,
77 ecx,
78 edx >> 24,
79 edx & 0xFFFFFF);
81 return max_leaf;
85 * do_hypercall- Invoke the specified hypercall
87 static u64 do_hypercall(u64 control, void *input, void *output)
89 #ifdef CONFIG_X86_64
90 u64 hv_status = 0;
91 u64 input_address = (input) ? virt_to_phys(input) : 0;
92 u64 output_address = (output) ? virt_to_phys(output) : 0;
93 void *hypercall_page = hv_context.hypercall_page;
95 __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
96 __asm__ __volatile__("call *%3" : "=a" (hv_status) :
97 "c" (control), "d" (input_address),
98 "m" (hypercall_page));
100 return hv_status;
102 #else
104 u32 control_hi = control >> 32;
105 u32 control_lo = control & 0xFFFFFFFF;
106 u32 hv_status_hi = 1;
107 u32 hv_status_lo = 1;
108 u64 input_address = (input) ? virt_to_phys(input) : 0;
109 u32 input_address_hi = input_address >> 32;
110 u32 input_address_lo = input_address & 0xFFFFFFFF;
111 u64 output_address = (output) ? virt_to_phys(output) : 0;
112 u32 output_address_hi = output_address >> 32;
113 u32 output_address_lo = output_address & 0xFFFFFFFF;
114 void *hypercall_page = hv_context.hypercall_page;
116 __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
117 "=a"(hv_status_lo) : "d" (control_hi),
118 "a" (control_lo), "b" (input_address_hi),
119 "c" (input_address_lo), "D"(output_address_hi),
120 "S"(output_address_lo), "m" (hypercall_page));
122 return hv_status_lo | ((u64)hv_status_hi << 32);
123 #endif /* !x86_64 */
127 * hv_init - Main initialization routine.
129 * This routine must be called before any other routines in here are called
131 int hv_init(void)
133 int max_leaf;
134 union hv_x64_msr_hypercall_contents hypercall_msr;
135 void *virtaddr = NULL;
137 memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
138 memset(hv_context.synic_message_page, 0,
139 sizeof(void *) * NR_CPUS);
141 max_leaf = query_hypervisor_info();
144 * Write our OS ID.
146 hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
147 wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
149 /* See if the hypercall page is already set */
150 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
152 virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
154 if (!virtaddr)
155 goto cleanup;
157 hypercall_msr.enable = 1;
159 hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
160 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
162 /* Confirm that hypercall page did get setup. */
163 hypercall_msr.as_uint64 = 0;
164 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
166 if (!hypercall_msr.enable)
167 goto cleanup;
169 hv_context.hypercall_page = virtaddr;
171 /* Setup the global signal event param for the signal event hypercall */
172 hv_context.signal_event_buffer =
173 kmalloc(sizeof(struct hv_input_signal_event_buffer),
174 GFP_KERNEL);
175 if (!hv_context.signal_event_buffer)
176 goto cleanup;
178 hv_context.signal_event_param =
179 (struct hv_input_signal_event *)
180 (ALIGN((unsigned long)
181 hv_context.signal_event_buffer,
182 HV_HYPERCALL_PARAM_ALIGN));
183 hv_context.signal_event_param->connectionid.asu32 = 0;
184 hv_context.signal_event_param->connectionid.u.id =
185 VMBUS_EVENT_CONNECTION_ID;
186 hv_context.signal_event_param->flag_number = 0;
187 hv_context.signal_event_param->rsvdz = 0;
189 return 0;
191 cleanup:
192 if (virtaddr) {
193 if (hypercall_msr.enable) {
194 hypercall_msr.as_uint64 = 0;
195 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
198 vfree(virtaddr);
201 return -ENOTSUPP;
205 * hv_cleanup - Cleanup routine.
207 * This routine is called normally during driver unloading or exiting.
209 void hv_cleanup(void)
211 union hv_x64_msr_hypercall_contents hypercall_msr;
213 /* Reset our OS id */
214 wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
216 kfree(hv_context.signal_event_buffer);
217 hv_context.signal_event_buffer = NULL;
218 hv_context.signal_event_param = NULL;
220 if (hv_context.hypercall_page) {
221 hypercall_msr.as_uint64 = 0;
222 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
223 vfree(hv_context.hypercall_page);
224 hv_context.hypercall_page = NULL;
229 * hv_post_message - Post a message using the hypervisor message IPC.
231 * This involves a hypercall.
233 int hv_post_message(union hv_connection_id connection_id,
234 enum hv_message_type message_type,
235 void *payload, size_t payload_size)
237 struct aligned_input {
238 u64 alignment8;
239 struct hv_input_post_message msg;
242 struct hv_input_post_message *aligned_msg;
243 u16 status;
244 unsigned long addr;
246 if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
247 return -EMSGSIZE;
249 addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
250 if (!addr)
251 return -ENOMEM;
253 aligned_msg = (struct hv_input_post_message *)
254 (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
256 aligned_msg->connectionid = connection_id;
257 aligned_msg->message_type = message_type;
258 aligned_msg->payload_size = payload_size;
259 memcpy((void *)aligned_msg->payload, payload, payload_size);
261 status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
262 & 0xFFFF;
264 kfree((void *)addr);
266 return status;
271 * hv_signal_event -
272 * Signal an event on the specified connection using the hypervisor event IPC.
274 * This involves a hypercall.
276 u16 hv_signal_event(void)
278 u16 status;
280 status = do_hypercall(HVCALL_SIGNAL_EVENT,
281 hv_context.signal_event_param,
282 NULL) & 0xFFFF;
283 return status;
287 * hv_synic_init - Initialize the Synthethic Interrupt Controller.
289 * If it is already initialized by another entity (ie x2v shim), we need to
290 * retrieve the initialized message and event pages. Otherwise, we create and
291 * initialize the message and event pages.
293 void hv_synic_init(void *irqarg)
295 u64 version;
296 union hv_synic_simp simp;
297 union hv_synic_siefp siefp;
298 union hv_synic_sint shared_sint;
299 union hv_synic_scontrol sctrl;
301 u32 irq_vector = *((u32 *)(irqarg));
302 int cpu = smp_processor_id();
304 if (!hv_context.hypercall_page)
305 return;
307 /* Check the version */
308 rdmsrl(HV_X64_MSR_SVERSION, version);
310 hv_context.synic_message_page[cpu] =
311 (void *)get_zeroed_page(GFP_ATOMIC);
313 if (hv_context.synic_message_page[cpu] == NULL) {
314 pr_err("Unable to allocate SYNIC message page\n");
315 goto cleanup;
318 hv_context.synic_event_page[cpu] =
319 (void *)get_zeroed_page(GFP_ATOMIC);
321 if (hv_context.synic_event_page[cpu] == NULL) {
322 pr_err("Unable to allocate SYNIC event page\n");
323 goto cleanup;
326 /* Setup the Synic's message page */
327 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
328 simp.simp_enabled = 1;
329 simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
330 >> PAGE_SHIFT;
332 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
334 /* Setup the Synic's event page */
335 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
336 siefp.siefp_enabled = 1;
337 siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
338 >> PAGE_SHIFT;
340 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
342 /* Setup the shared SINT. */
343 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
345 shared_sint.as_uint64 = 0;
346 shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
347 shared_sint.masked = false;
348 shared_sint.auto_eoi = false;
350 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
352 /* Enable the global synic bit */
353 rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
354 sctrl.enable = 1;
356 wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
358 hv_context.synic_initialized = true;
359 return;
361 cleanup:
362 if (hv_context.synic_event_page[cpu])
363 free_page((unsigned long)hv_context.synic_event_page[cpu]);
365 if (hv_context.synic_message_page[cpu])
366 free_page((unsigned long)hv_context.synic_message_page[cpu]);
367 return;
371 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
373 void hv_synic_cleanup(void *arg)
375 union hv_synic_sint shared_sint;
376 union hv_synic_simp simp;
377 union hv_synic_siefp siefp;
378 int cpu = smp_processor_id();
380 if (!hv_context.synic_initialized)
381 return;
383 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
385 shared_sint.masked = 1;
387 /* Need to correctly cleanup in the case of SMP!!! */
388 /* Disable the interrupt */
389 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
391 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
392 simp.simp_enabled = 0;
393 simp.base_simp_gpa = 0;
395 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
397 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
398 siefp.siefp_enabled = 0;
399 siefp.base_siefp_gpa = 0;
401 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
403 free_page((unsigned long)hv_context.synic_message_page[cpu]);
404 free_page((unsigned long)hv_context.synic_event_page[cpu]);