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- /*
- * 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 <asm/nospec-branch.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;
- }
- /*
- * do_hypercall- Invoke the specified hypercall
- */
- static u64 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_NOSPEC :
- "=a" (hv_status) :
- "c" (control), "d" (input_address),
- THUNK_TARGET(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_NOSPEC : "=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),
- THUNK_TARGET(hypercall_page));
- return hv_status_lo | ((u64)hv_status_hi << 32);
- #endif /* !x86_64 */
- }
- #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 != -1) {
- /*
- * 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 != -1)
- 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_RX);
- 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(bool crash)
- {
- 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);
- if (!crash)
- 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);
- if (!crash) {
- 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;
- u16 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 = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
- & 0xFFFF;
- put_cpu();
- 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;
- }
- 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_present_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;
- }
- INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
- }
- 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_present_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;
- /*
- * 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);
- }
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