diff options
Diffstat (limited to 'drivers/staging/hv/Hv.c')
| -rw-r--r-- | drivers/staging/hv/Hv.c | 526 |
1 files changed, 0 insertions, 526 deletions
diff --git a/drivers/staging/hv/Hv.c b/drivers/staging/hv/Hv.c deleted file mode 100644 index 3a1112d29aeb..000000000000 --- a/drivers/staging/hv/Hv.c +++ /dev/null @@ -1,526 +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> - * - */ -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/vmalloc.h> -#include "osd.h" -#include "logging.h" -#include "VmbusPrivate.h" - -/* The one and only */ -struct hv_context gHvContext = { - .SynICInitialized = false, - .HypercallPage = NULL, - .SignalEventParam = NULL, - .SignalEventBuffer = NULL, -}; - -/** - * HvQueryHypervisorPresence - Query the cpuid for presense of windows hypervisor - */ -static int HvQueryHypervisorPresence(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 = HvCpuIdFunctionVersionAndFeatures; - cpuid(op, &eax, &ebx, &ecx, &edx); - - return ecx & HV_PRESENT_BIT; -} - -/** - * HvQueryHypervisorInfo - Get version info of the windows hypervisor - */ -static int HvQueryHypervisorInfo(void) -{ - unsigned int eax; - unsigned int ebx; - unsigned int ecx; - unsigned int edx; - unsigned int maxLeaf; - 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 = HvCpuIdFunctionHvVendorAndMaxFunction; - cpuid(op, &eax, &ebx, &ecx, &edx); - - DPRINT_INFO(VMBUS, "Vendor ID: %c%c%c%c%c%c%c%c%c%c%c%c", - (ebx & 0xFF), - ((ebx >> 8) & 0xFF), - ((ebx >> 16) & 0xFF), - ((ebx >> 24) & 0xFF), - (ecx & 0xFF), - ((ecx >> 8) & 0xFF), - ((ecx >> 16) & 0xFF), - ((ecx >> 24) & 0xFF), - (edx & 0xFF), - ((edx >> 8) & 0xFF), - ((edx >> 16) & 0xFF), - ((edx >> 24) & 0xFF)); - - maxLeaf = eax; - eax = 0; - ebx = 0; - ecx = 0; - edx = 0; - op = HvCpuIdFunctionHvInterface; - cpuid(op, &eax, &ebx, &ecx, &edx); - - DPRINT_INFO(VMBUS, "Interface ID: %c%c%c%c", - (eax & 0xFF), - ((eax >> 8) & 0xFF), - ((eax >> 16) & 0xFF), - ((eax >> 24) & 0xFF)); - - if (maxLeaf >= HvCpuIdFunctionMsHvVersion) { - eax = 0; - ebx = 0; - ecx = 0; - edx = 0; - op = HvCpuIdFunctionMsHvVersion; - cpuid(op, &eax, &ebx, &ecx, &edx); - DPRINT_INFO(VMBUS, "OS Build:%d-%d.%d-%d-%d.%d",\ - eax, - ebx >> 16, - ebx & 0xFFFF, - ecx, - edx >> 24, - edx & 0xFFFFFF); - } - return maxLeaf; -} - -/** - * HvDoHypercall - Invoke the specified hypercall - */ -static u64 HvDoHypercall(u64 Control, void *Input, void *Output) -{ -#ifdef CONFIG_X86_64 - u64 hvStatus = 0; - u64 inputAddress = (Input) ? virt_to_phys(Input) : 0; - u64 outputAddress = (Output) ? virt_to_phys(Output) : 0; - volatile void *hypercallPage = gHvContext.HypercallPage; - - DPRINT_DBG(VMBUS, "Hypercall <control %llx input phys %llx virt %p " - "output phys %llx virt %p hypercall %p>", - Control, inputAddress, Input, - outputAddress, Output, hypercallPage); - - __asm__ __volatile__("mov %0, %%r8" : : "r" (outputAddress) : "r8"); - __asm__ __volatile__("call *%3" : "=a" (hvStatus) : - "c" (Control), "d" (inputAddress), - "m" (hypercallPage)); - - DPRINT_DBG(VMBUS, "Hypercall <return %llx>", hvStatus); - - return hvStatus; - -#else - - u32 controlHi = Control >> 32; - u32 controlLo = Control & 0xFFFFFFFF; - u32 hvStatusHi = 1; - u32 hvStatusLo = 1; - u64 inputAddress = (Input) ? virt_to_phys(Input) : 0; - u32 inputAddressHi = inputAddress >> 32; - u32 inputAddressLo = inputAddress & 0xFFFFFFFF; - u64 outputAddress = (Output) ? virt_to_phys(Output) : 0; - u32 outputAddressHi = outputAddress >> 32; - u32 outputAddressLo = outputAddress & 0xFFFFFFFF; - volatile void *hypercallPage = gHvContext.HypercallPage; - - DPRINT_DBG(VMBUS, "Hypercall <control %llx input %p output %p>", - Control, Input, Output); - - __asm__ __volatile__ ("call *%8" : "=d"(hvStatusHi), - "=a"(hvStatusLo) : "d" (controlHi), - "a" (controlLo), "b" (inputAddressHi), - "c" (inputAddressLo), "D"(outputAddressHi), - "S"(outputAddressLo), "m" (hypercallPage)); - - DPRINT_DBG(VMBUS, "Hypercall <return %llx>", - hvStatusLo | ((u64)hvStatusHi << 32)); - - return hvStatusLo | ((u64)hvStatusHi << 32); -#endif /* !x86_64 */ -} - -/** - * HvInit - Main initialization routine. - * - * This routine must be called before any other routines in here are called - */ -int HvInit(void) -{ - int ret = 0; - int maxLeaf; - union hv_x64_msr_hypercall_contents hypercallMsr; - void *virtAddr = NULL; - - DPRINT_ENTER(VMBUS); - - memset(gHvContext.synICEventPage, 0, sizeof(void *) * MAX_NUM_CPUS); - memset(gHvContext.synICMessagePage, 0, sizeof(void *) * MAX_NUM_CPUS); - - if (!HvQueryHypervisorPresence()) { - DPRINT_ERR(VMBUS, "No Windows hypervisor detected!!"); - goto Cleanup; - } - - DPRINT_INFO(VMBUS, - "Windows hypervisor detected! Retrieving more info..."); - - maxLeaf = HvQueryHypervisorInfo(); - /* HvQueryHypervisorFeatures(maxLeaf); */ - - /* - * We only support running on top of Hyper-V - */ - rdmsrl(HV_X64_MSR_GUEST_OS_ID, gHvContext.GuestId); - - if (gHvContext.GuestId != 0) { - DPRINT_ERR(VMBUS, "Unknown guest id (0x%llx)!!", - gHvContext.GuestId); - goto Cleanup; - } - - /* Write our OS info */ - wrmsrl(HV_X64_MSR_GUEST_OS_ID, HV_LINUX_GUEST_ID); - gHvContext.GuestId = HV_LINUX_GUEST_ID; - - /* See if the hypercall page is already set */ - rdmsrl(HV_X64_MSR_HYPERCALL, hypercallMsr.AsUINT64); - - /* - * Allocate the hypercall page memory - * virtAddr = osd_PageAlloc(1); - */ - virtAddr = osd_VirtualAllocExec(PAGE_SIZE); - - if (!virtAddr) { - DPRINT_ERR(VMBUS, - "unable to allocate hypercall page!!"); - goto Cleanup; - } - - hypercallMsr.Enable = 1; - - hypercallMsr.GuestPhysicalAddress = vmalloc_to_pfn(virtAddr); - wrmsrl(HV_X64_MSR_HYPERCALL, hypercallMsr.AsUINT64); - - /* Confirm that hypercall page did get setup. */ - hypercallMsr.AsUINT64 = 0; - rdmsrl(HV_X64_MSR_HYPERCALL, hypercallMsr.AsUINT64); - - if (!hypercallMsr.Enable) { - DPRINT_ERR(VMBUS, "unable to set hypercall page!!"); - goto Cleanup; - } - - gHvContext.HypercallPage = virtAddr; - - DPRINT_INFO(VMBUS, "Hypercall page VA=%p, PA=0x%0llx", - gHvContext.HypercallPage, - (u64)hypercallMsr.GuestPhysicalAddress << PAGE_SHIFT); - - /* Setup the global signal event param for the signal event hypercall */ - gHvContext.SignalEventBuffer = - kmalloc(sizeof(struct hv_input_signal_event_buffer), - GFP_KERNEL); - if (!gHvContext.SignalEventBuffer) - goto Cleanup; - - gHvContext.SignalEventParam = - (struct hv_input_signal_event *) - (ALIGN_UP((unsigned long)gHvContext.SignalEventBuffer, - HV_HYPERCALL_PARAM_ALIGN)); - gHvContext.SignalEventParam->ConnectionId.Asu32 = 0; - gHvContext.SignalEventParam->ConnectionId.u.Id = - VMBUS_EVENT_CONNECTION_ID; - gHvContext.SignalEventParam->FlagNumber = 0; - gHvContext.SignalEventParam->RsvdZ = 0; - - DPRINT_EXIT(VMBUS); - - return ret; - -Cleanup: - if (virtAddr) { - if (hypercallMsr.Enable) { - hypercallMsr.AsUINT64 = 0; - wrmsrl(HV_X64_MSR_HYPERCALL, hypercallMsr.AsUINT64); - } - - vfree(virtAddr); - } - ret = -1; - DPRINT_EXIT(VMBUS); - - return ret; -} - -/** - * HvCleanup - Cleanup routine. - * - * This routine is called normally during driver unloading or exiting. - */ -void HvCleanup(void) -{ - union hv_x64_msr_hypercall_contents hypercallMsr; - - DPRINT_ENTER(VMBUS); - - if (gHvContext.SignalEventBuffer) { - kfree(gHvContext.SignalEventBuffer); - gHvContext.SignalEventBuffer = NULL; - gHvContext.SignalEventParam = NULL; - } - - if (gHvContext.HypercallPage) { - hypercallMsr.AsUINT64 = 0; - wrmsrl(HV_X64_MSR_HYPERCALL, hypercallMsr.AsUINT64); - vfree(gHvContext.HypercallPage); - gHvContext.HypercallPage = NULL; - } - - DPRINT_EXIT(VMBUS); -} - -/** - * HvPostMessage - Post a message using the hypervisor message IPC. - * - * This involves a hypercall. - */ -u16 HvPostMessage(union hv_connection_id connectionId, - enum hv_message_type messageType, - void *payload, size_t payloadSize) -{ - struct alignedInput { - u64 alignment8; - struct hv_input_post_message msg; - }; - - struct hv_input_post_message *alignedMsg; - u16 status; - unsigned long addr; - - if (payloadSize > HV_MESSAGE_PAYLOAD_BYTE_COUNT) - return -1; - - addr = (unsigned long)kmalloc(sizeof(struct alignedInput), GFP_ATOMIC); - if (!addr) - return -1; - - alignedMsg = (struct hv_input_post_message *) - (ALIGN_UP(addr, HV_HYPERCALL_PARAM_ALIGN)); - - alignedMsg->ConnectionId = connectionId; - alignedMsg->MessageType = messageType; - alignedMsg->PayloadSize = payloadSize; - memcpy((void *)alignedMsg->Payload, payload, payloadSize); - - status = HvDoHypercall(HvCallPostMessage, alignedMsg, NULL) & 0xFFFF; - - kfree((void *)addr); - - return status; -} - - -/** - * HvSignalEvent - Signal an event on the specified connection using the hypervisor event IPC. - * - * This involves a hypercall. - */ -u16 HvSignalEvent(void) -{ - u16 status; - - status = HvDoHypercall(HvCallSignalEvent, gHvContext.SignalEventParam, - NULL) & 0xFFFF; - return status; -} - -/** - * HvSynicInit - 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 HvSynicInit(void *irqarg) -{ - u64 version; - union hv_synic_simp simp; - union hv_synic_siefp siefp; - union hv_synic_sint sharedSint; - union hv_synic_scontrol sctrl; - - u32 irqVector = *((u32 *)(irqarg)); - int cpu = smp_processor_id(); - - DPRINT_ENTER(VMBUS); - - if (!gHvContext.HypercallPage) { - DPRINT_EXIT(VMBUS); - return; - } - - /* Check the version */ - rdmsrl(HV_X64_MSR_SVERSION, version); - - DPRINT_INFO(VMBUS, "SynIC version: %llx", version); - - gHvContext.synICMessagePage[cpu] = (void *)get_zeroed_page(GFP_ATOMIC); - - if (gHvContext.synICMessagePage[cpu] == NULL) { - DPRINT_ERR(VMBUS, - "unable to allocate SYNIC message page!!"); - goto Cleanup; - } - - gHvContext.synICEventPage[cpu] = (void *)get_zeroed_page(GFP_ATOMIC); - - if (gHvContext.synICEventPage[cpu] == NULL) { - DPRINT_ERR(VMBUS, - "unable to allocate SYNIC event page!!"); - goto Cleanup; - } - - /* Setup the Synic's message page */ - rdmsrl(HV_X64_MSR_SIMP, simp.AsUINT64); - simp.SimpEnabled = 1; - simp.BaseSimpGpa = virt_to_phys(gHvContext.synICMessagePage[cpu]) - >> PAGE_SHIFT; - - DPRINT_DBG(VMBUS, "HV_X64_MSR_SIMP msr set to: %llx", simp.AsUINT64); - - wrmsrl(HV_X64_MSR_SIMP, simp.AsUINT64); - - /* Setup the Synic's event page */ - rdmsrl(HV_X64_MSR_SIEFP, siefp.AsUINT64); - siefp.SiefpEnabled = 1; - siefp.BaseSiefpGpa = virt_to_phys(gHvContext.synICEventPage[cpu]) - >> PAGE_SHIFT; - - DPRINT_DBG(VMBUS, "HV_X64_MSR_SIEFP msr set to: %llx", siefp.AsUINT64); - - wrmsrl(HV_X64_MSR_SIEFP, siefp.AsUINT64); - - /* Setup the interception SINT. */ - /* wrmsrl((HV_X64_MSR_SINT0 + HV_SYNIC_INTERCEPTION_SINT_INDEX), */ - /* interceptionSint.AsUINT64); */ - - /* Setup the shared SINT. */ - rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, sharedSint.AsUINT64); - - sharedSint.AsUINT64 = 0; - sharedSint.Vector = irqVector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */ - sharedSint.Masked = false; - sharedSint.AutoEoi = true; - - DPRINT_DBG(VMBUS, "HV_X64_MSR_SINT1 msr set to: %llx", - sharedSint.AsUINT64); - - wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, sharedSint.AsUINT64); - - /* Enable the global synic bit */ - rdmsrl(HV_X64_MSR_SCONTROL, sctrl.AsUINT64); - sctrl.Enable = 1; - - wrmsrl(HV_X64_MSR_SCONTROL, sctrl.AsUINT64); - - gHvContext.SynICInitialized = true; - - DPRINT_EXIT(VMBUS); - - return; - -Cleanup: - if (gHvContext.synICEventPage[cpu]) - osd_PageFree(gHvContext.synICEventPage[cpu], 1); - - if (gHvContext.synICMessagePage[cpu]) - osd_PageFree(gHvContext.synICMessagePage[cpu], 1); - - DPRINT_EXIT(VMBUS); - return; -} - -/** - * HvSynicCleanup - Cleanup routine for HvSynicInit(). - */ -void HvSynicCleanup(void *arg) -{ - union hv_synic_sint sharedSint; - union hv_synic_simp simp; - union hv_synic_siefp siefp; - int cpu = smp_processor_id(); - - DPRINT_ENTER(VMBUS); - - if (!gHvContext.SynICInitialized) { - DPRINT_EXIT(VMBUS); - return; - } - - rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, sharedSint.AsUINT64); - - sharedSint.Masked = 1; - - /* Need to correctly cleanup in the case of SMP!!! */ - /* Disable the interrupt */ - wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, sharedSint.AsUINT64); - - rdmsrl(HV_X64_MSR_SIMP, simp.AsUINT64); - simp.SimpEnabled = 0; - simp.BaseSimpGpa = 0; - - wrmsrl(HV_X64_MSR_SIMP, simp.AsUINT64); - - rdmsrl(HV_X64_MSR_SIEFP, siefp.AsUINT64); - siefp.SiefpEnabled = 0; - siefp.BaseSiefpGpa = 0; - - wrmsrl(HV_X64_MSR_SIEFP, siefp.AsUINT64); - - osd_PageFree(gHvContext.synICMessagePage[cpu], 1); - osd_PageFree(gHvContext.synICEventPage[cpu], 1); - - DPRINT_EXIT(VMBUS); -} |