diff options
Diffstat (limited to 'drivers/staging/hv/hv.c')
| -rw-r--r-- | drivers/staging/hv/hv.c | 438 |
1 files changed, 0 insertions, 438 deletions
diff --git a/drivers/staging/hv/hv.c b/drivers/staging/hv/hv.c deleted file mode 100644 index 824f81679ae8..000000000000 --- a/drivers/staging/hv/hv.c +++ /dev/null @@ -1,438 +0,0 @@ -/* - * 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 "hyperv.h" -#include "hyperv_vmbus.h" - -/* The one and only */ -struct hv_context hv_context = { - .synic_initialized = false, - .hypercall_page = NULL, - .signal_event_param = NULL, - .signal_event_buffer = NULL, -}; - -/* - * query_hypervisor_presence - * - Query the cpuid for presence of windows hypervisor - */ -static int query_hypervisor_presence(void) -{ - unsigned int eax; - unsigned int ebx; - unsigned int ecx; - unsigned int edx; - unsigned int op; - - eax = 0; - ebx = 0; - ecx = 0; - edx = 0; - op = HVCPUID_VERSION_FEATURES; - cpuid(op, &eax, &ebx, &ecx, &edx); - - return ecx & HV_PRESENT_BIT; -} - -/* - * query_hypervisor_info - Get version info of the windows hypervisor - */ -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); - pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n", - eax, - ebx >> 16, - ebx & 0xFFFF, - ecx, - edx >> 24, - edx & 0xFFFFFF); - } - 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; - volatile 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; - volatile 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 ret = 0; - int max_leaf; - union hv_x64_msr_hypercall_contents hypercall_msr; - void *virtaddr = NULL; - - memset(hv_context.synic_event_page, 0, sizeof(void *) * MAX_NUM_CPUS); - memset(hv_context.synic_message_page, 0, - sizeof(void *) * MAX_NUM_CPUS); - - if (!query_hypervisor_presence()) - goto cleanup; - - max_leaf = query_hypervisor_info(); - /* HvQueryHypervisorFeatures(maxLeaf); */ - - /* - * We only support running on top of Hyper-V - */ - rdmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid); - - if (hv_context.guestid != 0) - goto cleanup; - - /* Write our OS info */ - wrmsrl(HV_X64_MSR_GUEST_OS_ID, HV_LINUX_GUEST_ID); - hv_context.guestid = HV_LINUX_GUEST_ID; - - /* See if the hypercall page is already set */ - rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); - - /* - * Allocate the hypercall page memory - * virtaddr = osd_page_alloc(1); - */ - 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; - - /* Setup the global signal event param for the signal event hypercall */ - hv_context.signal_event_buffer = - kmalloc(sizeof(struct hv_input_signal_event_buffer), - GFP_KERNEL); - if (!hv_context.signal_event_buffer) - goto cleanup; - - hv_context.signal_event_param = - (struct hv_input_signal_event *) - (ALIGN((unsigned long) - hv_context.signal_event_buffer, - HV_HYPERCALL_PARAM_ALIGN)); - hv_context.signal_event_param->connectionid.asu32 = 0; - hv_context.signal_event_param->connectionid.u.id = - VMBUS_EVENT_CONNECTION_ID; - hv_context.signal_event_param->flag_number = 0; - hv_context.signal_event_param->rsvdz = 0; - - return ret; - -cleanup: - if (virtaddr) { - if (hypercall_msr.enable) { - hypercall_msr.as_uint64 = 0; - wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); - } - - vfree(virtaddr); - } - ret = -1; - return ret; -} - -/* - * 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; - - kfree(hv_context.signal_event_buffer); - hv_context.signal_event_buffer = NULL; - hv_context.signal_event_param = NULL; - - 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. - */ -u16 hv_post_message(union hv_connection_id connection_id, - enum hv_message_type message_type, - void *payload, size_t payload_size) -{ - struct aligned_input { - u64 alignment8; - struct hv_input_post_message msg; - }; - - struct hv_input_post_message *aligned_msg; - u16 status; - unsigned long addr; - - if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) - return -EMSGSIZE; - - addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC); - if (!addr) - return -ENOMEM; - - aligned_msg = (struct hv_input_post_message *) - (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN)); - - aligned_msg->connectionid = connection_id; - 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; - - kfree((void *)addr); - - 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) -{ - u16 status; - - status = do_hypercall(HVCALL_SIGNAL_EVENT, - hv_context.signal_event_param, - NULL) & 0xFFFF; - return status; -} - -/* - * 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 *irqarg) -{ - u64 version; - union hv_synic_simp simp; - union hv_synic_siefp siefp; - union hv_synic_sint shared_sint; - union hv_synic_scontrol sctrl; - - u32 irq_vector = *((u32 *)(irqarg)); - int cpu = smp_processor_id(); - - if (!hv_context.hypercall_page) - return; - - /* Check the version */ - rdmsrl(HV_X64_MSR_SVERSION, version); - - 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 cleanup; - } - - 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 cleanup; - } - - /* 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 = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */ - 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; - return; - -cleanup: - 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]); - return; -} - -/* - * 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; - int cpu = smp_processor_id(); - - if (!hv_context.synic_initialized) - return; - - 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); - - free_page((unsigned long)hv_context.synic_message_page[cpu]); - free_page((unsigned long)hv_context.synic_event_page[cpu]); -} |