Merge branch 'master' of /home/davem/src/GIT/linux-2.6/

1 files changed, 524 insertions, 0 deletions

diff --git a/drivers/staging/hv/hv.c b/drivers/staging/hv/hv.c
new file mode 100644
index 000000000000..6c77e64027f0
--- /dev/null
+++ b/drivers/staging/hv/hv.c
@@ -0,0 +1,524 @@
+/*
+ * 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 "vmbus_private.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);
+
+	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);
+}