| /* |
| * 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, |
| }; |
| |
| #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_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 */ |
| hv_get_simp(simp.as_uint64); |
| simp.simp_enabled = 1; |
| simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu]) |
| >> PAGE_SHIFT; |
| |
| hv_set_simp(simp.as_uint64); |
| |
| /* Setup the Synic's event page */ |
| hv_get_siefp(siefp.as_uint64); |
| siefp.siefp_enabled = 1; |
| siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu]) |
| >> PAGE_SHIFT; |
| |
| hv_set_siefp(siefp.as_uint64); |
| |
| /* Setup the shared SINT. */ |
| hv_get_synint_state(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; |
| |
| hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, |
| shared_sint.as_uint64); |
| |
| /* Enable the global synic bit */ |
| hv_get_synic_state(sctrl.as_uint64); |
| sctrl.enable = 1; |
| |
| hv_set_synic_state(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. |
| */ |
| hv_get_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]); |
| } |
| |
| hv_get_synint_state(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 */ |
| hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, |
| shared_sint.as_uint64); |
| |
| hv_get_simp(simp.as_uint64); |
| simp.simp_enabled = 0; |
| simp.base_simp_gpa = 0; |
| |
| hv_set_simp(simp.as_uint64); |
| |
| hv_get_siefp(siefp.as_uint64); |
| siefp.siefp_enabled = 0; |
| siefp.base_siefp_gpa = 0; |
| |
| hv_set_siefp(siefp.as_uint64); |
| |
| /* Disable the global synic bit */ |
| hv_get_synic_state(sctrl.as_uint64); |
| sctrl.enable = 0; |
| hv_set_synic_state(sctrl.as_uint64); |
| |
| return 0; |
| } |