| 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 <linux/clockchips.h> |
| 32 | #include <asm/hyperv.h> |
| 33 | #include <asm/mshyperv.h> |
| 34 | #include "hyperv_vmbus.h" |
| 35 | |
| 36 | /* The one and only */ |
| 37 | struct hv_context hv_context = { |
| 38 | .synic_initialized = false, |
| 39 | .hypercall_page = NULL, |
| 40 | }; |
| 41 | |
| 42 | #define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */ |
| 43 | #define HV_MAX_MAX_DELTA_TICKS 0xffffffff |
| 44 | #define HV_MIN_DELTA_TICKS 1 |
| 45 | |
| 46 | /* |
| 47 | * query_hypervisor_info - Get version info of the windows hypervisor |
| 48 | */ |
| 49 | unsigned int host_info_eax; |
| 50 | unsigned int host_info_ebx; |
| 51 | unsigned int host_info_ecx; |
| 52 | unsigned int host_info_edx; |
| 53 | |
| 54 | static int query_hypervisor_info(void) |
| 55 | { |
| 56 | unsigned int eax; |
| 57 | unsigned int ebx; |
| 58 | unsigned int ecx; |
| 59 | unsigned int edx; |
| 60 | unsigned int max_leaf; |
| 61 | unsigned int op; |
| 62 | |
| 63 | /* |
| 64 | * Its assumed that this is called after confirming that Viridian |
| 65 | * is present. Query id and revision. |
| 66 | */ |
| 67 | eax = 0; |
| 68 | ebx = 0; |
| 69 | ecx = 0; |
| 70 | edx = 0; |
| 71 | op = HVCPUID_VENDOR_MAXFUNCTION; |
| 72 | cpuid(op, &eax, &ebx, &ecx, &edx); |
| 73 | |
| 74 | max_leaf = eax; |
| 75 | |
| 76 | if (max_leaf >= HVCPUID_VERSION) { |
| 77 | eax = 0; |
| 78 | ebx = 0; |
| 79 | ecx = 0; |
| 80 | edx = 0; |
| 81 | op = HVCPUID_VERSION; |
| 82 | cpuid(op, &eax, &ebx, &ecx, &edx); |
| 83 | host_info_eax = eax; |
| 84 | host_info_ebx = ebx; |
| 85 | host_info_ecx = ecx; |
| 86 | host_info_edx = edx; |
| 87 | } |
| 88 | return max_leaf; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * hv_do_hypercall- Invoke the specified hypercall |
| 93 | */ |
| 94 | u64 hv_do_hypercall(u64 control, void *input, void *output) |
| 95 | { |
| 96 | u64 input_address = (input) ? virt_to_phys(input) : 0; |
| 97 | u64 output_address = (output) ? virt_to_phys(output) : 0; |
| 98 | void *hypercall_page = hv_context.hypercall_page; |
| 99 | #ifdef CONFIG_X86_64 |
| 100 | u64 hv_status = 0; |
| 101 | |
| 102 | if (!hypercall_page) |
| 103 | return (u64)ULLONG_MAX; |
| 104 | |
| 105 | __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8"); |
| 106 | __asm__ __volatile__("call *%3" : "=a" (hv_status) : |
| 107 | "c" (control), "d" (input_address), |
| 108 | "m" (hypercall_page)); |
| 109 | |
| 110 | return hv_status; |
| 111 | |
| 112 | #else |
| 113 | |
| 114 | u32 control_hi = control >> 32; |
| 115 | u32 control_lo = control & 0xFFFFFFFF; |
| 116 | u32 hv_status_hi = 1; |
| 117 | u32 hv_status_lo = 1; |
| 118 | u32 input_address_hi = input_address >> 32; |
| 119 | u32 input_address_lo = input_address & 0xFFFFFFFF; |
| 120 | u32 output_address_hi = output_address >> 32; |
| 121 | u32 output_address_lo = output_address & 0xFFFFFFFF; |
| 122 | |
| 123 | if (!hypercall_page) |
| 124 | return (u64)ULLONG_MAX; |
| 125 | |
| 126 | __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi), |
| 127 | "=a"(hv_status_lo) : "d" (control_hi), |
| 128 | "a" (control_lo), "b" (input_address_hi), |
| 129 | "c" (input_address_lo), "D"(output_address_hi), |
| 130 | "S"(output_address_lo), "m" (hypercall_page)); |
| 131 | |
| 132 | return hv_status_lo | ((u64)hv_status_hi << 32); |
| 133 | #endif /* !x86_64 */ |
| 134 | } |
| 135 | EXPORT_SYMBOL_GPL(hv_do_hypercall); |
| 136 | |
| 137 | #ifdef CONFIG_X86_64 |
| 138 | static cycle_t read_hv_clock_tsc(struct clocksource *arg) |
| 139 | { |
| 140 | cycle_t current_tick; |
| 141 | struct ms_hyperv_tsc_page *tsc_pg = hv_context.tsc_page; |
| 142 | |
| 143 | if (tsc_pg->tsc_sequence != 0) { |
| 144 | /* |
| 145 | * Use the tsc page to compute the value. |
| 146 | */ |
| 147 | |
| 148 | while (1) { |
| 149 | cycle_t tmp; |
| 150 | u32 sequence = tsc_pg->tsc_sequence; |
| 151 | u64 cur_tsc; |
| 152 | u64 scale = tsc_pg->tsc_scale; |
| 153 | s64 offset = tsc_pg->tsc_offset; |
| 154 | |
| 155 | rdtscll(cur_tsc); |
| 156 | /* current_tick = ((cur_tsc *scale) >> 64) + offset */ |
| 157 | asm("mulq %3" |
| 158 | : "=d" (current_tick), "=a" (tmp) |
| 159 | : "a" (cur_tsc), "r" (scale)); |
| 160 | |
| 161 | current_tick += offset; |
| 162 | if (tsc_pg->tsc_sequence == sequence) |
| 163 | return current_tick; |
| 164 | |
| 165 | if (tsc_pg->tsc_sequence != 0) |
| 166 | continue; |
| 167 | /* |
| 168 | * Fallback using MSR method. |
| 169 | */ |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); |
| 174 | return current_tick; |
| 175 | } |
| 176 | |
| 177 | static struct clocksource hyperv_cs_tsc = { |
| 178 | .name = "hyperv_clocksource_tsc_page", |
| 179 | .rating = 425, |
| 180 | .read = read_hv_clock_tsc, |
| 181 | .mask = CLOCKSOURCE_MASK(64), |
| 182 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| 183 | }; |
| 184 | #endif |
| 185 | |
| 186 | |
| 187 | /* |
| 188 | * hv_init - Main initialization routine. |
| 189 | * |
| 190 | * This routine must be called before any other routines in here are called |
| 191 | */ |
| 192 | int hv_init(void) |
| 193 | { |
| 194 | int max_leaf; |
| 195 | union hv_x64_msr_hypercall_contents hypercall_msr; |
| 196 | void *virtaddr = NULL; |
| 197 | |
| 198 | memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS); |
| 199 | memset(hv_context.synic_message_page, 0, |
| 200 | sizeof(void *) * NR_CPUS); |
| 201 | memset(hv_context.post_msg_page, 0, |
| 202 | sizeof(void *) * NR_CPUS); |
| 203 | memset(hv_context.vp_index, 0, |
| 204 | sizeof(int) * NR_CPUS); |
| 205 | memset(hv_context.event_dpc, 0, |
| 206 | sizeof(void *) * NR_CPUS); |
| 207 | memset(hv_context.msg_dpc, 0, |
| 208 | sizeof(void *) * NR_CPUS); |
| 209 | memset(hv_context.clk_evt, 0, |
| 210 | sizeof(void *) * NR_CPUS); |
| 211 | |
| 212 | max_leaf = query_hypervisor_info(); |
| 213 | |
| 214 | /* |
| 215 | * Write our OS ID. |
| 216 | */ |
| 217 | hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0); |
| 218 | wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid); |
| 219 | |
| 220 | /* See if the hypercall page is already set */ |
| 221 | rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| 222 | |
| 223 | virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC); |
| 224 | |
| 225 | if (!virtaddr) |
| 226 | goto cleanup; |
| 227 | |
| 228 | hypercall_msr.enable = 1; |
| 229 | |
| 230 | hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr); |
| 231 | wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| 232 | |
| 233 | /* Confirm that hypercall page did get setup. */ |
| 234 | hypercall_msr.as_uint64 = 0; |
| 235 | rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| 236 | |
| 237 | if (!hypercall_msr.enable) |
| 238 | goto cleanup; |
| 239 | |
| 240 | hv_context.hypercall_page = virtaddr; |
| 241 | |
| 242 | #ifdef CONFIG_X86_64 |
| 243 | if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) { |
| 244 | union hv_x64_msr_hypercall_contents tsc_msr; |
| 245 | void *va_tsc; |
| 246 | |
| 247 | va_tsc = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL); |
| 248 | if (!va_tsc) |
| 249 | goto cleanup; |
| 250 | hv_context.tsc_page = va_tsc; |
| 251 | |
| 252 | rdmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64); |
| 253 | |
| 254 | tsc_msr.enable = 1; |
| 255 | tsc_msr.guest_physical_address = vmalloc_to_pfn(va_tsc); |
| 256 | |
| 257 | wrmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64); |
| 258 | clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100); |
| 259 | } |
| 260 | #endif |
| 261 | return 0; |
| 262 | |
| 263 | cleanup: |
| 264 | if (virtaddr) { |
| 265 | if (hypercall_msr.enable) { |
| 266 | hypercall_msr.as_uint64 = 0; |
| 267 | wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| 268 | } |
| 269 | |
| 270 | vfree(virtaddr); |
| 271 | } |
| 272 | |
| 273 | return -ENOTSUPP; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * hv_cleanup - Cleanup routine. |
| 278 | * |
| 279 | * This routine is called normally during driver unloading or exiting. |
| 280 | */ |
| 281 | void hv_cleanup(void) |
| 282 | { |
| 283 | union hv_x64_msr_hypercall_contents hypercall_msr; |
| 284 | |
| 285 | /* Reset our OS id */ |
| 286 | wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); |
| 287 | |
| 288 | if (hv_context.hypercall_page) { |
| 289 | hypercall_msr.as_uint64 = 0; |
| 290 | wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| 291 | vfree(hv_context.hypercall_page); |
| 292 | hv_context.hypercall_page = NULL; |
| 293 | } |
| 294 | |
| 295 | #ifdef CONFIG_X86_64 |
| 296 | /* |
| 297 | * Cleanup the TSC page based CS. |
| 298 | */ |
| 299 | if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) { |
| 300 | /* |
| 301 | * Crash can happen in an interrupt context and unregistering |
| 302 | * a clocksource is impossible and redundant in this case. |
| 303 | */ |
| 304 | if (!oops_in_progress) { |
| 305 | clocksource_change_rating(&hyperv_cs_tsc, 10); |
| 306 | clocksource_unregister(&hyperv_cs_tsc); |
| 307 | } |
| 308 | |
| 309 | hypercall_msr.as_uint64 = 0; |
| 310 | wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64); |
| 311 | vfree(hv_context.tsc_page); |
| 312 | hv_context.tsc_page = NULL; |
| 313 | } |
| 314 | #endif |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * hv_post_message - Post a message using the hypervisor message IPC. |
| 319 | * |
| 320 | * This involves a hypercall. |
| 321 | */ |
| 322 | int hv_post_message(union hv_connection_id connection_id, |
| 323 | enum hv_message_type message_type, |
| 324 | void *payload, size_t payload_size) |
| 325 | { |
| 326 | |
| 327 | struct hv_input_post_message *aligned_msg; |
| 328 | u64 status; |
| 329 | |
| 330 | if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) |
| 331 | return -EMSGSIZE; |
| 332 | |
| 333 | aligned_msg = (struct hv_input_post_message *) |
| 334 | hv_context.post_msg_page[get_cpu()]; |
| 335 | |
| 336 | aligned_msg->connectionid = connection_id; |
| 337 | aligned_msg->reserved = 0; |
| 338 | aligned_msg->message_type = message_type; |
| 339 | aligned_msg->payload_size = payload_size; |
| 340 | memcpy((void *)aligned_msg->payload, payload, payload_size); |
| 341 | |
| 342 | status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); |
| 343 | |
| 344 | put_cpu(); |
| 345 | return status & 0xFFFF; |
| 346 | } |
| 347 | |
| 348 | static int hv_ce_set_next_event(unsigned long delta, |
| 349 | struct clock_event_device *evt) |
| 350 | { |
| 351 | cycle_t current_tick; |
| 352 | |
| 353 | WARN_ON(!clockevent_state_oneshot(evt)); |
| 354 | |
| 355 | rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); |
| 356 | current_tick += delta; |
| 357 | wrmsrl(HV_X64_MSR_STIMER0_COUNT, current_tick); |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int hv_ce_shutdown(struct clock_event_device *evt) |
| 362 | { |
| 363 | wrmsrl(HV_X64_MSR_STIMER0_COUNT, 0); |
| 364 | wrmsrl(HV_X64_MSR_STIMER0_CONFIG, 0); |
| 365 | |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | static int hv_ce_set_oneshot(struct clock_event_device *evt) |
| 370 | { |
| 371 | union hv_timer_config timer_cfg; |
| 372 | |
| 373 | timer_cfg.enable = 1; |
| 374 | timer_cfg.auto_enable = 1; |
| 375 | timer_cfg.sintx = VMBUS_MESSAGE_SINT; |
| 376 | wrmsrl(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64); |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu) |
| 382 | { |
| 383 | dev->name = "Hyper-V clockevent"; |
| 384 | dev->features = CLOCK_EVT_FEAT_ONESHOT; |
| 385 | dev->cpumask = cpumask_of(cpu); |
| 386 | dev->rating = 1000; |
| 387 | /* |
| 388 | * Avoid settint dev->owner = THIS_MODULE deliberately as doing so will |
| 389 | * result in clockevents_config_and_register() taking additional |
| 390 | * references to the hv_vmbus module making it impossible to unload. |
| 391 | */ |
| 392 | |
| 393 | dev->set_state_shutdown = hv_ce_shutdown; |
| 394 | dev->set_state_oneshot = hv_ce_set_oneshot; |
| 395 | dev->set_next_event = hv_ce_set_next_event; |
| 396 | } |
| 397 | |
| 398 | |
| 399 | int hv_synic_alloc(void) |
| 400 | { |
| 401 | size_t size = sizeof(struct tasklet_struct); |
| 402 | size_t ced_size = sizeof(struct clock_event_device); |
| 403 | int cpu; |
| 404 | |
| 405 | hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids, |
| 406 | GFP_ATOMIC); |
| 407 | if (hv_context.hv_numa_map == NULL) { |
| 408 | pr_err("Unable to allocate NUMA map\n"); |
| 409 | goto err; |
| 410 | } |
| 411 | |
| 412 | for_each_online_cpu(cpu) { |
| 413 | hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC); |
| 414 | if (hv_context.event_dpc[cpu] == NULL) { |
| 415 | pr_err("Unable to allocate event dpc\n"); |
| 416 | goto err; |
| 417 | } |
| 418 | tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu); |
| 419 | |
| 420 | hv_context.msg_dpc[cpu] = kmalloc(size, GFP_ATOMIC); |
| 421 | if (hv_context.msg_dpc[cpu] == NULL) { |
| 422 | pr_err("Unable to allocate event dpc\n"); |
| 423 | goto err; |
| 424 | } |
| 425 | tasklet_init(hv_context.msg_dpc[cpu], vmbus_on_msg_dpc, cpu); |
| 426 | |
| 427 | hv_context.clk_evt[cpu] = kzalloc(ced_size, GFP_ATOMIC); |
| 428 | if (hv_context.clk_evt[cpu] == NULL) { |
| 429 | pr_err("Unable to allocate clock event device\n"); |
| 430 | goto err; |
| 431 | } |
| 432 | |
| 433 | hv_init_clockevent_device(hv_context.clk_evt[cpu], cpu); |
| 434 | |
| 435 | hv_context.synic_message_page[cpu] = |
| 436 | (void *)get_zeroed_page(GFP_ATOMIC); |
| 437 | |
| 438 | if (hv_context.synic_message_page[cpu] == NULL) { |
| 439 | pr_err("Unable to allocate SYNIC message page\n"); |
| 440 | goto err; |
| 441 | } |
| 442 | |
| 443 | hv_context.synic_event_page[cpu] = |
| 444 | (void *)get_zeroed_page(GFP_ATOMIC); |
| 445 | |
| 446 | if (hv_context.synic_event_page[cpu] == NULL) { |
| 447 | pr_err("Unable to allocate SYNIC event page\n"); |
| 448 | goto err; |
| 449 | } |
| 450 | |
| 451 | hv_context.post_msg_page[cpu] = |
| 452 | (void *)get_zeroed_page(GFP_ATOMIC); |
| 453 | |
| 454 | if (hv_context.post_msg_page[cpu] == NULL) { |
| 455 | pr_err("Unable to allocate post msg page\n"); |
| 456 | goto err; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | return 0; |
| 461 | err: |
| 462 | return -ENOMEM; |
| 463 | } |
| 464 | |
| 465 | static void hv_synic_free_cpu(int cpu) |
| 466 | { |
| 467 | kfree(hv_context.event_dpc[cpu]); |
| 468 | kfree(hv_context.msg_dpc[cpu]); |
| 469 | kfree(hv_context.clk_evt[cpu]); |
| 470 | if (hv_context.synic_event_page[cpu]) |
| 471 | free_page((unsigned long)hv_context.synic_event_page[cpu]); |
| 472 | if (hv_context.synic_message_page[cpu]) |
| 473 | free_page((unsigned long)hv_context.synic_message_page[cpu]); |
| 474 | if (hv_context.post_msg_page[cpu]) |
| 475 | free_page((unsigned long)hv_context.post_msg_page[cpu]); |
| 476 | } |
| 477 | |
| 478 | void hv_synic_free(void) |
| 479 | { |
| 480 | int cpu; |
| 481 | |
| 482 | kfree(hv_context.hv_numa_map); |
| 483 | for_each_online_cpu(cpu) |
| 484 | hv_synic_free_cpu(cpu); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * hv_synic_init - Initialize the Synthethic Interrupt Controller. |
| 489 | * |
| 490 | * If it is already initialized by another entity (ie x2v shim), we need to |
| 491 | * retrieve the initialized message and event pages. Otherwise, we create and |
| 492 | * initialize the message and event pages. |
| 493 | */ |
| 494 | void hv_synic_init(void *arg) |
| 495 | { |
| 496 | u64 version; |
| 497 | union hv_synic_simp simp; |
| 498 | union hv_synic_siefp siefp; |
| 499 | union hv_synic_sint shared_sint; |
| 500 | union hv_synic_scontrol sctrl; |
| 501 | u64 vp_index; |
| 502 | |
| 503 | int cpu = smp_processor_id(); |
| 504 | |
| 505 | if (!hv_context.hypercall_page) |
| 506 | return; |
| 507 | |
| 508 | /* Check the version */ |
| 509 | rdmsrl(HV_X64_MSR_SVERSION, version); |
| 510 | |
| 511 | /* Setup the Synic's message page */ |
| 512 | rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| 513 | simp.simp_enabled = 1; |
| 514 | simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu]) |
| 515 | >> PAGE_SHIFT; |
| 516 | |
| 517 | wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| 518 | |
| 519 | /* Setup the Synic's event page */ |
| 520 | rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| 521 | siefp.siefp_enabled = 1; |
| 522 | siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu]) |
| 523 | >> PAGE_SHIFT; |
| 524 | |
| 525 | wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| 526 | |
| 527 | /* Setup the shared SINT. */ |
| 528 | rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| 529 | |
| 530 | shared_sint.as_uint64 = 0; |
| 531 | shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR; |
| 532 | shared_sint.masked = false; |
| 533 | shared_sint.auto_eoi = true; |
| 534 | |
| 535 | wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| 536 | |
| 537 | /* Enable the global synic bit */ |
| 538 | rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| 539 | sctrl.enable = 1; |
| 540 | |
| 541 | wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| 542 | |
| 543 | hv_context.synic_initialized = true; |
| 544 | |
| 545 | /* |
| 546 | * Setup the mapping between Hyper-V's notion |
| 547 | * of cpuid and Linux' notion of cpuid. |
| 548 | * This array will be indexed using Linux cpuid. |
| 549 | */ |
| 550 | rdmsrl(HV_X64_MSR_VP_INDEX, vp_index); |
| 551 | hv_context.vp_index[cpu] = (u32)vp_index; |
| 552 | |
| 553 | INIT_LIST_HEAD(&hv_context.percpu_list[cpu]); |
| 554 | |
| 555 | /* |
| 556 | * Register the per-cpu clockevent source. |
| 557 | */ |
| 558 | if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) |
| 559 | clockevents_config_and_register(hv_context.clk_evt[cpu], |
| 560 | HV_TIMER_FREQUENCY, |
| 561 | HV_MIN_DELTA_TICKS, |
| 562 | HV_MAX_MAX_DELTA_TICKS); |
| 563 | return; |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * hv_synic_clockevents_cleanup - Cleanup clockevent devices |
| 568 | */ |
| 569 | void hv_synic_clockevents_cleanup(void) |
| 570 | { |
| 571 | int cpu; |
| 572 | |
| 573 | if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)) |
| 574 | return; |
| 575 | |
| 576 | for_each_online_cpu(cpu) |
| 577 | clockevents_unbind_device(hv_context.clk_evt[cpu], cpu); |
| 578 | } |
| 579 | |
| 580 | /* |
| 581 | * hv_synic_cleanup - Cleanup routine for hv_synic_init(). |
| 582 | */ |
| 583 | void hv_synic_cleanup(void *arg) |
| 584 | { |
| 585 | union hv_synic_sint shared_sint; |
| 586 | union hv_synic_simp simp; |
| 587 | union hv_synic_siefp siefp; |
| 588 | union hv_synic_scontrol sctrl; |
| 589 | int cpu = smp_processor_id(); |
| 590 | |
| 591 | if (!hv_context.synic_initialized) |
| 592 | return; |
| 593 | |
| 594 | /* Turn off clockevent device */ |
| 595 | if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) |
| 596 | hv_ce_shutdown(hv_context.clk_evt[cpu]); |
| 597 | |
| 598 | rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| 599 | |
| 600 | shared_sint.masked = 1; |
| 601 | |
| 602 | /* Need to correctly cleanup in the case of SMP!!! */ |
| 603 | /* Disable the interrupt */ |
| 604 | wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| 605 | |
| 606 | rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| 607 | simp.simp_enabled = 0; |
| 608 | simp.base_simp_gpa = 0; |
| 609 | |
| 610 | wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| 611 | |
| 612 | rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| 613 | siefp.siefp_enabled = 0; |
| 614 | siefp.base_siefp_gpa = 0; |
| 615 | |
| 616 | wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| 617 | |
| 618 | /* Disable the global synic bit */ |
| 619 | rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| 620 | sctrl.enable = 0; |
| 621 | wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| 622 | } |