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1/*
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 */
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
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 <linux/interrupt.h>
31#include <asm/hyperv.h>
32#include "hyperv_vmbus.h"
33
34/* The one and only */
35struct hv_context hv_context = {
36 .synic_initialized = false,
37 .hypercall_page = NULL,
38};
39
40/*
41 * query_hypervisor_info - Get version info of the windows hypervisor
42 */
43unsigned int host_info_eax;
44unsigned int host_info_ebx;
45unsigned int host_info_ecx;
46unsigned int host_info_edx;
47
48static int query_hypervisor_info(void)
49{
50 unsigned int eax;
51 unsigned int ebx;
52 unsigned int ecx;
53 unsigned int edx;
54 unsigned int max_leaf;
55 unsigned int op;
56
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;
65 op = HVCPUID_VENDOR_MAXFUNCTION;
66 cpuid(op, &eax, &ebx, &ecx, &edx);
67
68 max_leaf = eax;
69
70 if (max_leaf >= HVCPUID_VERSION) {
71 eax = 0;
72 ebx = 0;
73 ecx = 0;
74 edx = 0;
75 op = HVCPUID_VERSION;
76 cpuid(op, &eax, &ebx, &ecx, &edx);
77 host_info_eax = eax;
78 host_info_ebx = ebx;
79 host_info_ecx = ecx;
80 host_info_edx = edx;
81 }
82 return max_leaf;
83}
84
85/*
86 * do_hypercall- Invoke the specified hypercall
87 */
88static u64 do_hypercall(u64 control, void *input, void *output)
89{
90#ifdef CONFIG_X86_64
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;
94 void *hypercall_page = hv_context.hypercall_page;
95
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));
100
101 return hv_status;
102
103#else
104
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;
115 void *hypercall_page = hv_context.hypercall_page;
116
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));
122
123 return hv_status_lo | ((u64)hv_status_hi << 32);
124#endif /* !x86_64 */
125}
126
127/*
128 * hv_init - Main initialization routine.
129 *
130 * This routine must be called before any other routines in here are called
131 */
132int hv_init(void)
133{
134 int max_leaf;
135 union hv_x64_msr_hypercall_contents hypercall_msr;
136 void *virtaddr = NULL;
137
138 memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
139 memset(hv_context.synic_message_page, 0,
140 sizeof(void *) * NR_CPUS);
141 memset(hv_context.vp_index, 0,
142 sizeof(int) * NR_CPUS);
143 memset(hv_context.event_dpc, 0,
144 sizeof(void *) * NR_CPUS);
145
146 max_leaf = query_hypervisor_info();
147
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);
153
154 /* See if the hypercall page is already set */
155 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
156
157 virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
158
159 if (!virtaddr)
160 goto cleanup;
161
162 hypercall_msr.enable = 1;
163
164 hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
165 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
166
167 /* Confirm that hypercall page did get setup. */
168 hypercall_msr.as_uint64 = 0;
169 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
170
171 if (!hypercall_msr.enable)
172 goto cleanup;
173
174 hv_context.hypercall_page = virtaddr;
175
176 return 0;
177
178cleanup:
179 if (virtaddr) {
180 if (hypercall_msr.enable) {
181 hypercall_msr.as_uint64 = 0;
182 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
183 }
184
185 vfree(virtaddr);
186 }
187
188 return -ENOTSUPP;
189}
190
191/*
192 * hv_cleanup - Cleanup routine.
193 *
194 * This routine is called normally during driver unloading or exiting.
195 */
196void hv_cleanup(void)
197{
198 union hv_x64_msr_hypercall_contents hypercall_msr;
199
200 /* Reset our OS id */
201 wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
202
203 if (hv_context.hypercall_page) {
204 hypercall_msr.as_uint64 = 0;
205 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
206 vfree(hv_context.hypercall_page);
207 hv_context.hypercall_page = NULL;
208 }
209}
210
211/*
212 * hv_post_message - Post a message using the hypervisor message IPC.
213 *
214 * This involves a hypercall.
215 */
216int hv_post_message(union hv_connection_id connection_id,
217 enum hv_message_type message_type,
218 void *payload, size_t payload_size)
219{
220 struct aligned_input {
221 u64 alignment8;
222 struct hv_input_post_message msg;
223 };
224
225 struct hv_input_post_message *aligned_msg;
226 u16 status;
227 unsigned long addr;
228
229 if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
230 return -EMSGSIZE;
231
232 addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
233 if (!addr)
234 return -ENOMEM;
235
236 aligned_msg = (struct hv_input_post_message *)
237 (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
238
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);
243
244 status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
245 & 0xFFFF;
246
247 kfree((void *)addr);
248
249 return status;
250}
251
252
253/*
254 * hv_signal_event -
255 * Signal an event on the specified connection using the hypervisor event IPC.
256 *
257 * This involves a hypercall.
258 */
259u16 hv_signal_event(void *con_id)
260{
261 u16 status;
262
263 status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
264
265 return status;
266}
267
268
269int 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;
300err:
301 return -ENOMEM;
302}
303
304static void hv_synic_free_cpu(int cpu)
305{
306 kfree(hv_context.event_dpc[cpu]);
307 if (hv_context.synic_event_page[cpu])
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
313void hv_synic_free(void)
314{
315 int cpu;
316
317 for_each_online_cpu(cpu)
318 hv_synic_free_cpu(cpu);
319}
320
321/*
322 * hv_synic_init - Initialize the Synthethic Interrupt Controller.
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 */
328void hv_synic_init(void *arg)
329{
330 u64 version;
331 union hv_synic_simp simp;
332 union hv_synic_siefp siefp;
333 union hv_synic_sint shared_sint;
334 union hv_synic_scontrol sctrl;
335 u64 vp_index;
336
337 int cpu = smp_processor_id();
338
339 if (!hv_context.hypercall_page)
340 return;
341
342 /* Check the version */
343 rdmsrl(HV_X64_MSR_SVERSION, version);
344
345 /* Setup the Synic's message page */
346 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
347 simp.simp_enabled = 1;
348 simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
349 >> PAGE_SHIFT;
350
351 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
352
353 /* Setup the Synic's event page */
354 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
355 siefp.siefp_enabled = 1;
356 siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
357 >> PAGE_SHIFT;
358
359 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
360
361 /* Setup the shared SINT. */
362 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
363
364 shared_sint.as_uint64 = 0;
365 shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
366 shared_sint.masked = false;
367 shared_sint.auto_eoi = true;
368
369 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
370
371 /* Enable the global synic bit */
372 rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
373 sctrl.enable = 1;
374
375 wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
376
377 hv_context.synic_initialized = true;
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;
386 return;
387}
388
389/*
390 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
391 */
392void hv_synic_cleanup(void *arg)
393{
394 union hv_synic_sint shared_sint;
395 union hv_synic_simp simp;
396 union hv_synic_siefp siefp;
397 int cpu = smp_processor_id();
398
399 if (!hv_context.synic_initialized)
400 return;
401
402 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
403
404 shared_sint.masked = 1;
405
406 /* Need to correctly cleanup in the case of SMP!!! */
407 /* Disable the interrupt */
408 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
409
410 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
411 simp.simp_enabled = 0;
412 simp.base_simp_gpa = 0;
413
414 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
415
416 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
417 siefp.siefp_enabled = 0;
418 siefp.base_siefp_gpa = 0;
419
420 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
421
422 free_page((unsigned long)hv_context.synic_message_page[cpu]);
423 free_page((unsigned long)hv_context.synic_event_page[cpu]);
424}