| /* |
| * 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 <linux/clockchips.h> |
| #include <asm/hyperv.h> |
| #include <asm/mshyperv.h> |
| #include "hyperv_vmbus.h" |
| |
| /* The one and only */ |
| struct hv_context hv_context = { |
| .synic_initialized = false, |
| .hypercall_page = NULL, |
| }; |
| |
| #define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */ |
| #define HV_MAX_MAX_DELTA_TICKS 0xffffffff |
| #define HV_MIN_DELTA_TICKS 1 |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * hv_do_hypercall- Invoke the specified hypercall |
| */ |
| u64 hv_do_hypercall(u64 control, void *input, void *output) |
| { |
| 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; |
| #ifdef CONFIG_X86_64 |
| u64 hv_status = 0; |
| |
| if (!hypercall_page) |
| return (u64)ULLONG_MAX; |
| |
| __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; |
| u32 input_address_hi = input_address >> 32; |
| u32 input_address_lo = input_address & 0xFFFFFFFF; |
| u32 output_address_hi = output_address >> 32; |
| u32 output_address_lo = output_address & 0xFFFFFFFF; |
| |
| if (!hypercall_page) |
| return (u64)ULLONG_MAX; |
| |
| __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 */ |
| } |
| EXPORT_SYMBOL_GPL(hv_do_hypercall); |
| |
| #ifdef CONFIG_X86_64 |
| static cycle_t read_hv_clock_tsc(struct clocksource *arg) |
| { |
| cycle_t current_tick; |
| struct ms_hyperv_tsc_page *tsc_pg = hv_context.tsc_page; |
| |
| if (tsc_pg->tsc_sequence != 0) { |
| /* |
| * Use the tsc page to compute the value. |
| */ |
| |
| while (1) { |
| cycle_t tmp; |
| u32 sequence = tsc_pg->tsc_sequence; |
| u64 cur_tsc; |
| u64 scale = tsc_pg->tsc_scale; |
| s64 offset = tsc_pg->tsc_offset; |
| |
| rdtscll(cur_tsc); |
| /* current_tick = ((cur_tsc *scale) >> 64) + offset */ |
| asm("mulq %3" |
| : "=d" (current_tick), "=a" (tmp) |
| : "a" (cur_tsc), "r" (scale)); |
| |
| current_tick += offset; |
| if (tsc_pg->tsc_sequence == sequence) |
| return current_tick; |
| |
| if (tsc_pg->tsc_sequence != 0) |
| continue; |
| /* |
| * Fallback using MSR method. |
| */ |
| break; |
| } |
| } |
| rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); |
| return current_tick; |
| } |
| |
| static struct clocksource hyperv_cs_tsc = { |
| .name = "hyperv_clocksource_tsc_page", |
| .rating = 425, |
| .read = read_hv_clock_tsc, |
| .mask = CLOCKSOURCE_MASK(64), |
| .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| }; |
| #endif |
| |
| |
| /* |
| * 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.post_msg_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); |
| memset(hv_context.clk_evt, 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; |
| |
| #ifdef CONFIG_X86_64 |
| if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) { |
| union hv_x64_msr_hypercall_contents tsc_msr; |
| void *va_tsc; |
| |
| va_tsc = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL); |
| if (!va_tsc) |
| goto cleanup; |
| hv_context.tsc_page = va_tsc; |
| |
| rdmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64); |
| |
| tsc_msr.enable = 1; |
| tsc_msr.guest_physical_address = vmalloc_to_pfn(va_tsc); |
| |
| wrmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64); |
| clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100); |
| } |
| #endif |
| 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; |
| } |
| |
| #ifdef CONFIG_X86_64 |
| /* |
| * Cleanup the TSC page based CS. |
| */ |
| if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) { |
| /* |
| * Crash can happen in an interrupt context and unregistering |
| * a clocksource is impossible and redundant in this case. |
| */ |
| if (!oops_in_progress) { |
| clocksource_change_rating(&hyperv_cs_tsc, 10); |
| clocksource_unregister(&hyperv_cs_tsc); |
| } |
| |
| hypercall_msr.as_uint64 = 0; |
| wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64); |
| vfree(hv_context.tsc_page); |
| hv_context.tsc_page = NULL; |
| } |
| #endif |
| } |
| |
| /* |
| * 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 hv_input_post_message *aligned_msg; |
| u64 status; |
| |
| if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) |
| return -EMSGSIZE; |
| |
| aligned_msg = (struct hv_input_post_message *) |
| hv_context.post_msg_page[get_cpu()]; |
| |
| aligned_msg->connectionid = connection_id; |
| aligned_msg->reserved = 0; |
| aligned_msg->message_type = message_type; |
| aligned_msg->payload_size = payload_size; |
| memcpy((void *)aligned_msg->payload, payload, payload_size); |
| |
| status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); |
| |
| put_cpu(); |
| return status & 0xFFFF; |
| } |
| |
| static int hv_ce_set_next_event(unsigned long delta, |
| struct clock_event_device *evt) |
| { |
| cycle_t current_tick; |
| |
| WARN_ON(!clockevent_state_oneshot(evt)); |
| |
| rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); |
| current_tick += delta; |
| wrmsrl(HV_X64_MSR_STIMER0_COUNT, current_tick); |
| return 0; |
| } |
| |
| static int hv_ce_shutdown(struct clock_event_device *evt) |
| { |
| wrmsrl(HV_X64_MSR_STIMER0_COUNT, 0); |
| wrmsrl(HV_X64_MSR_STIMER0_CONFIG, 0); |
| |
| return 0; |
| } |
| |
| static int hv_ce_set_oneshot(struct clock_event_device *evt) |
| { |
| union hv_timer_config timer_cfg; |
| |
| timer_cfg.enable = 1; |
| timer_cfg.auto_enable = 1; |
| timer_cfg.sintx = VMBUS_MESSAGE_SINT; |
| wrmsrl(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64); |
| |
| return 0; |
| } |
| |
| static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu) |
| { |
| dev->name = "Hyper-V clockevent"; |
| dev->features = CLOCK_EVT_FEAT_ONESHOT; |
| dev->cpumask = cpumask_of(cpu); |
| dev->rating = 1000; |
| /* |
| * Avoid settint dev->owner = THIS_MODULE deliberately as doing so will |
| * result in clockevents_config_and_register() taking additional |
| * references to the hv_vmbus module making it impossible to unload. |
| */ |
| |
| dev->set_state_shutdown = hv_ce_shutdown; |
| dev->set_state_oneshot = hv_ce_set_oneshot; |
| dev->set_next_event = hv_ce_set_next_event; |
| } |
| |
| |
| int hv_synic_alloc(void) |
| { |
| size_t size = sizeof(struct tasklet_struct); |
| size_t ced_size = sizeof(struct clock_event_device); |
| int cpu; |
| |
| hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids, |
| GFP_ATOMIC); |
| if (hv_context.hv_numa_map == NULL) { |
| pr_err("Unable to allocate NUMA map\n"); |
| goto err; |
| } |
| |
| 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.clk_evt[cpu] = kzalloc(ced_size, GFP_ATOMIC); |
| if (hv_context.clk_evt[cpu] == NULL) { |
| pr_err("Unable to allocate clock event device\n"); |
| goto err; |
| } |
| |
| hv_init_clockevent_device(hv_context.clk_evt[cpu], 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; |
| } |
| |
| hv_context.post_msg_page[cpu] = |
| (void *)get_zeroed_page(GFP_ATOMIC); |
| |
| if (hv_context.post_msg_page[cpu] == NULL) { |
| pr_err("Unable to allocate post msg page\n"); |
| goto err; |
| } |
| } |
| |
| return 0; |
| err: |
| return -ENOMEM; |
| } |
| |
| static void hv_synic_free_cpu(int cpu) |
| { |
| kfree(hv_context.event_dpc[cpu]); |
| kfree(hv_context.clk_evt[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]); |
| if (hv_context.post_msg_page[cpu]) |
| free_page((unsigned long)hv_context.post_msg_page[cpu]); |
| } |
| |
| void hv_synic_free(void) |
| { |
| int cpu; |
| |
| kfree(hv_context.hv_numa_map); |
| 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; |
| |
| INIT_LIST_HEAD(&hv_context.percpu_list[cpu]); |
| |
| /* |
| * Register the per-cpu clockevent source. |
| */ |
| if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) |
| clockevents_config_and_register(hv_context.clk_evt[cpu], |
| HV_TIMER_FREQUENCY, |
| HV_MIN_DELTA_TICKS, |
| HV_MAX_MAX_DELTA_TICKS); |
| return; |
| } |
| |
| /* |
| * hv_synic_clockevents_cleanup - Cleanup clockevent devices |
| */ |
| void hv_synic_clockevents_cleanup(void) |
| { |
| int cpu; |
| |
| if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)) |
| return; |
| |
| for_each_online_cpu(cpu) |
| clockevents_unbind_device(hv_context.clk_evt[cpu], cpu); |
| } |
| |
| /* |
| * 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; |
| union hv_synic_scontrol sctrl; |
| int cpu = smp_processor_id(); |
| |
| if (!hv_context.synic_initialized) |
| return; |
| |
| /* Turn off clockevent device */ |
| if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) |
| hv_ce_shutdown(hv_context.clk_evt[cpu]); |
| |
| 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); |
| |
| /* Disable the global synic bit */ |
| rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| sctrl.enable = 0; |
| wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| } |