From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/hv/hv.c | 535 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 535 insertions(+) create mode 100644 kernel/drivers/hv/hv.c (limited to 'kernel/drivers/hv/hv.c') diff --git a/kernel/drivers/hv/hv.c b/kernel/drivers/hv/hv.c new file mode 100644 index 000000000..d3943bcee --- /dev/null +++ b/kernel/drivers/hv/hv.c @@ -0,0 +1,535 @@ +/* + * 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, + .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) +{ +#ifdef CONFIG_X86_64 + u64 hv_status = 0; + 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; + + __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; + u64 input_address = (input) ? virt_to_phys(input) : 0; + u32 input_address_hi = input_address >> 32; + u32 input_address_lo = input_address & 0xFFFFFFFF; + u64 output_address = (output) ? virt_to_phys(output) : 0; + u32 output_address_hi = output_address >> 32; + u32 output_address_lo = output_address & 0xFFFFFFFF; + void *hypercall_page = hv_context.hypercall_page; + + __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 */ +} + +/* + * 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; + + 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; + } +} + +/* + * 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(evt->mode != CLOCK_EVT_MODE_ONESHOT); + + rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); + current_tick += delta; + wrmsrl(HV_X64_MSR_STIMER0_COUNT, current_tick); + return 0; +} + +static void hv_ce_setmode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + union hv_timer_config timer_cfg; + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + /* unsupported */ + break; + + case CLOCK_EVT_MODE_ONESHOT: + 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); + break; + + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + wrmsrl(HV_X64_MSR_STIMER0_COUNT, 0); + wrmsrl(HV_X64_MSR_STIMER0_CONFIG, 0); + break; + case CLOCK_EVT_MODE_RESUME: + break; + } +} + +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_mode = hv_ce_setmode; + 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; + + 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; + + 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_setmode(CLOCK_EVT_MODE_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); + + hv_synic_free_cpu(cpu); +} -- cgit 1.2.3-korg