/* * 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 * Hank Janssen * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include "hyperv_vmbus.h" /* The one and only */ struct hv_context hv_context = { .synic_initialized = false, }; #define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */ #define HV_MAX_MAX_DELTA_TICKS 0xffffffff #define HV_MIN_DELTA_TICKS 1 /* * hv_init - Main initialization routine. * * This routine must be called before any other routines in here are called */ int hv_init(void) { 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.msg_dpc, 0, sizeof(void *) * NR_CPUS); memset(hv_context.clk_evt, 0, sizeof(void *) * NR_CPUS); if (!hv_is_hypercall_page_setup()) return -ENOTSUPP; return 0; } /* * hv_cleanup - Cleanup routine. * * This routine is called normally during driver unloading or exiting. */ void hv_cleanup(bool crash) { } /* * 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) { u64 current_tick; WARN_ON(!clockevent_state_oneshot(evt)); hv_get_current_tick(current_tick); current_tick += delta; hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick); return 0; } static int hv_ce_shutdown(struct clock_event_device *evt) { hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0); hv_init_timer_config(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; hv_init_timer_config(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.msg_dpc[cpu] = kmalloc(size, GFP_ATOMIC); if (hv_context.msg_dpc[cpu] == NULL) { pr_err("Unable to allocate event dpc\n"); goto err; } tasklet_init(hv_context.msg_dpc[cpu], vmbus_on_msg_dpc, 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.msg_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. */ int hv_synic_init(unsigned int cpu) { union hv_synic_simp simp; union hv_synic_siefp siefp; union hv_synic_sint shared_sint; union hv_synic_scontrol sctrl; u64 vp_index; /* 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 0; } /* * 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_present_cpu(cpu) clockevents_unbind_device(hv_context.clk_evt[cpu], cpu); } /* * hv_synic_cleanup - Cleanup routine for hv_synic_init(). */ int hv_synic_cleanup(unsigned int cpu) { union hv_synic_sint shared_sint; union hv_synic_simp simp; union hv_synic_siefp siefp; union hv_synic_scontrol sctrl; struct vmbus_channel *channel, *sc; bool channel_found = false; unsigned long flags; if (!hv_context.synic_initialized) return -EFAULT; /* * Search for channels which are bound to the CPU we're about to * cleanup. In case we find one and vmbus is still connected we need to * fail, this will effectively prevent CPU offlining. There is no way * we can re-bind channels to different CPUs for now. */ mutex_lock(&vmbus_connection.channel_mutex); list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { if (channel->target_cpu == cpu) { channel_found = true; break; } spin_lock_irqsave(&channel->lock, flags); list_for_each_entry(sc, &channel->sc_list, sc_list) { if (sc->target_cpu == cpu) { channel_found = true; break; } } spin_unlock_irqrestore(&channel->lock, flags); if (channel_found) break; } mutex_unlock(&vmbus_connection.channel_mutex); if (channel_found && vmbus_connection.conn_state == CONNECTED) return -EBUSY; /* Turn off clockevent device */ if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) { clockevents_unbind_device(hv_context.clk_evt[cpu], cpu); 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); return 0; }