Staging: hv: move hyperv code out of staging directory

After many years wandering the desert, it is finally time for the
Microsoft HyperV code to move out of the staging directory.  Or at least
the core hyperv bus code, and the utility driver, the rest still have
some review to get through by the various subsystem maintainers.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>

1 files changed, 647 insertions, 0 deletions

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
new file mode 100644
index 000000000000..41bf287baa1c
--- /dev/null
+++ b/drivers/hv/channel_mgmt.c
@@ -0,0 +1,647 @@
+/*
+ * 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/sched.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/hyperv.h>
+
+#include "hyperv_vmbus.h"
+
+struct vmbus_channel_message_table_entry {
+	enum vmbus_channel_message_type message_type;
+	void (*message_handler)(struct vmbus_channel_message_header *msg);
+};
+
+#define MAX_MSG_TYPES                    4
+#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
+
+static const uuid_le
+	supported_device_classes[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
+	/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
+	/* Storage - SCSI */
+	{
+		.b  = {
+			0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
+			0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
+		}
+	},
+
+	/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
+	/* Network */
+	{
+		.b = {
+			0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
+			0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
+		}
+	},
+
+	/* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
+	/* Input */
+	{
+		.b = {
+			0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
+			0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
+		}
+	},
+
+	/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
+	/* IDE */
+	{
+		.b = {
+			0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
+			0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
+		}
+	},
+	/* 0E0B6031-5213-4934-818B-38D90CED39DB */
+	/* Shutdown */
+	{
+		.b = {
+			0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
+			0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
+		}
+	},
+	/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
+	/* TimeSync */
+	{
+		.b = {
+			0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
+			0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
+		}
+	},
+	/* {57164f39-9115-4e78-ab55-382f3bd5422d} */
+	/* Heartbeat */
+	{
+		.b = {
+			0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
+			0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
+		}
+	},
+	/* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
+	/* KVP */
+	{
+		.b = {
+			0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
+			0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6
+	}
+	},
+
+};
+
+
+/**
+ * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
+ * @icmsghdrp: Pointer to msg header structure
+ * @icmsg_negotiate: Pointer to negotiate message structure
+ * @buf: Raw buffer channel data
+ *
+ * @icmsghdrp is of type &struct icmsg_hdr.
+ * @negop is of type &struct icmsg_negotiate.
+ * Set up and fill in default negotiate response message. This response can
+ * come from both the vmbus driver and the hv_utils driver. The current api
+ * will respond properly to both Windows 2008 and Windows 2008-R2 operating
+ * systems.
+ *
+ * Mainly used by Hyper-V drivers.
+ */
+void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
+			     struct icmsg_negotiate *negop,
+			     u8 *buf)
+{
+	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+		icmsghdrp->icmsgsize = 0x10;
+
+		negop = (struct icmsg_negotiate *)&buf[
+			sizeof(struct vmbuspipe_hdr) +
+			sizeof(struct icmsg_hdr)];
+
+		if (negop->icframe_vercnt == 2 &&
+		   negop->icversion_data[1].major == 3) {
+			negop->icversion_data[0].major = 3;
+			negop->icversion_data[0].minor = 0;
+			negop->icversion_data[1].major = 3;
+			negop->icversion_data[1].minor = 0;
+		} else {
+			negop->icversion_data[0].major = 1;
+			negop->icversion_data[0].minor = 0;
+			negop->icversion_data[1].major = 1;
+			negop->icversion_data[1].minor = 0;
+		}
+
+		negop->icframe_vercnt = 1;
+		negop->icmsg_vercnt = 1;
+	}
+}
+EXPORT_SYMBOL(prep_negotiate_resp);
+
+/*
+ * alloc_channel - Allocate and initialize a vmbus channel object
+ */
+static struct vmbus_channel *alloc_channel(void)
+{
+	struct vmbus_channel *channel;
+
+	channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
+	if (!channel)
+		return NULL;
+
+	spin_lock_init(&channel->inbound_lock);
+
+	channel->controlwq = create_workqueue("hv_vmbus_ctl");
+	if (!channel->controlwq) {
+		kfree(channel);
+		return NULL;
+	}
+
+	return channel;
+}
+
+/*
+ * release_hannel - Release the vmbus channel object itself
+ */
+static void release_channel(struct work_struct *work)
+{
+	struct vmbus_channel *channel = container_of(work,
+						     struct vmbus_channel,
+						     work);
+
+	destroy_workqueue(channel->controlwq);
+
+	kfree(channel);
+}
+
+/*
+ * free_channel - Release the resources used by the vmbus channel object
+ */
+void free_channel(struct vmbus_channel *channel)
+{
+
+	/*
+	 * We have to release the channel's workqueue/thread in the vmbus's
+	 * workqueue/thread context
+	 * ie we can't destroy ourselves.
+	 */
+	INIT_WORK(&channel->work, release_channel);
+	queue_work(vmbus_connection.work_queue, &channel->work);
+}
+
+
+
+/*
+ * vmbus_process_rescind_offer -
+ * Rescind the offer by initiating a device removal
+ */
+static void vmbus_process_rescind_offer(struct work_struct *work)
+{
+	struct vmbus_channel *channel = container_of(work,
+						     struct vmbus_channel,
+						     work);
+
+	vmbus_device_unregister(channel->device_obj);
+}
+
+/*
+ * vmbus_process_offer - Process the offer by creating a channel/device
+ * associated with this offer
+ */
+static void vmbus_process_offer(struct work_struct *work)
+{
+	struct vmbus_channel *newchannel = container_of(work,
+							struct vmbus_channel,
+							work);
+	struct vmbus_channel *channel;
+	bool fnew = true;
+	int ret;
+	unsigned long flags;
+
+	/* The next possible work is rescind handling */
+	INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
+
+	/* Make sure this is a new offer */
+	spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+
+	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+		if (!uuid_le_cmp(channel->offermsg.offer.if_type,
+			newchannel->offermsg.offer.if_type) &&
+			!uuid_le_cmp(channel->offermsg.offer.if_instance,
+				newchannel->offermsg.offer.if_instance)) {
+			fnew = false;
+			break;
+		}
+	}
+
+	if (fnew)
+		list_add_tail(&newchannel->listentry,
+			      &vmbus_connection.chn_list);
+
+	spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+
+	if (!fnew) {
+		free_channel(newchannel);
+		return;
+	}
+
+	/*
+	 * Start the process of binding this offer to the driver
+	 * We need to set the DeviceObject field before calling
+	 * vmbus_child_dev_add()
+	 */
+	newchannel->device_obj = vmbus_device_create(
+		&newchannel->offermsg.offer.if_type,
+		&newchannel->offermsg.offer.if_instance,
+		newchannel);
+
+	/*
+	 * Add the new device to the bus. This will kick off device-driver
+	 * binding which eventually invokes the device driver's AddDevice()
+	 * method.
+	 */
+	ret = vmbus_device_register(newchannel->device_obj);
+	if (ret != 0) {
+		pr_err("unable to add child device object (relid %d)\n",
+			   newchannel->offermsg.child_relid);
+
+		spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+		list_del(&newchannel->listentry);
+		spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+
+		free_channel(newchannel);
+	} else {
+		/*
+		 * This state is used to indicate a successful open
+		 * so that when we do close the channel normally, we
+		 * can cleanup properly
+		 */
+		newchannel->state = CHANNEL_OPEN_STATE;
+	}
+}
+
+/*
+ * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
+ *
+ */
+static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
+{
+	struct vmbus_channel_offer_channel *offer;
+	struct vmbus_channel *newchannel;
+	uuid_le *guidtype;
+	uuid_le *guidinstance;
+	int i;
+	int fsupported = 0;
+
+	offer = (struct vmbus_channel_offer_channel *)hdr;
+	for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
+		if (!uuid_le_cmp(offer->offer.if_type,
+				supported_device_classes[i])) {
+			fsupported = 1;
+			break;
+		}
+	}
+
+	if (!fsupported)
+		return;
+
+	guidtype = &offer->offer.if_type;
+	guidinstance = &offer->offer.if_instance;
+
+	/* Allocate the channel object and save this offer. */
+	newchannel = alloc_channel();
+	if (!newchannel) {
+		pr_err("Unable to allocate channel object\n");
+		return;
+	}
+
+	memcpy(&newchannel->offermsg, offer,
+	       sizeof(struct vmbus_channel_offer_channel));
+	newchannel->monitor_grp = (u8)offer->monitorid / 32;
+	newchannel->monitor_bit = (u8)offer->monitorid % 32;
+
+	INIT_WORK(&newchannel->work, vmbus_process_offer);
+	queue_work(newchannel->controlwq, &newchannel->work);
+}
+
+/*
+ * vmbus_onoffer_rescind - Rescind offer handler.
+ *
+ * We queue a work item to process this offer synchronously
+ */
+static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
+{
+	struct vmbus_channel_rescind_offer *rescind;
+	struct vmbus_channel *channel;
+
+	rescind = (struct vmbus_channel_rescind_offer *)hdr;
+	channel = relid2channel(rescind->child_relid);
+
+	if (channel == NULL)
+		/* Just return here, no channel found */
+		return;
+
+	/* work is initialized for vmbus_process_rescind_offer() from
+	 * vmbus_process_offer() where the channel got created */
+	queue_work(channel->controlwq, &channel->work);
+}
+
+/*
+ * vmbus_onoffers_delivered -
+ * This is invoked when all offers have been delivered.
+ *
+ * Nothing to do here.
+ */
+static void vmbus_onoffers_delivered(
+			struct vmbus_channel_message_header *hdr)
+{
+}
+
+/*
+ * vmbus_onopen_result - Open result handler.
+ *
+ * This is invoked when we received a response to our channel open request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
+{
+	struct vmbus_channel_open_result *result;
+	struct vmbus_channel_msginfo *msginfo;
+	struct vmbus_channel_message_header *requestheader;
+	struct vmbus_channel_open_channel *openmsg;
+	unsigned long flags;
+
+	result = (struct vmbus_channel_open_result *)hdr;
+
+	/*
+	 * Find the open msg, copy the result and signal/unblock the wait event
+	 */
+	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+	list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+				msglistentry) {
+		requestheader =
+			(struct vmbus_channel_message_header *)msginfo->msg;
+
+		if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
+			openmsg =
+			(struct vmbus_channel_open_channel *)msginfo->msg;
+			if (openmsg->child_relid == result->child_relid &&
+			    openmsg->openid == result->openid) {
+				memcpy(&msginfo->response.open_result,
+				       result,
+				       sizeof(
+					struct vmbus_channel_open_result));
+				complete(&msginfo->waitevent);
+				break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/*
+ * vmbus_ongpadl_created - GPADL created handler.
+ *
+ * This is invoked when we received a response to our gpadl create request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
+{
+	struct vmbus_channel_gpadl_created *gpadlcreated;
+	struct vmbus_channel_msginfo *msginfo;
+	struct vmbus_channel_message_header *requestheader;
+	struct vmbus_channel_gpadl_header *gpadlheader;
+	unsigned long flags;
+
+	gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
+
+	/*
+	 * Find the establish msg, copy the result and signal/unblock the wait
+	 * event
+	 */
+	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+	list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+				msglistentry) {
+		requestheader =
+			(struct vmbus_channel_message_header *)msginfo->msg;
+
+		if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
+			gpadlheader =
+			(struct vmbus_channel_gpadl_header *)requestheader;
+
+			if ((gpadlcreated->child_relid ==
+			     gpadlheader->child_relid) &&
+			    (gpadlcreated->gpadl == gpadlheader->gpadl)) {
+				memcpy(&msginfo->response.gpadl_created,
+				       gpadlcreated,
+				       sizeof(
+					struct vmbus_channel_gpadl_created));
+				complete(&msginfo->waitevent);
+				break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/*
+ * vmbus_ongpadl_torndown - GPADL torndown handler.
+ *
+ * This is invoked when we received a response to our gpadl teardown request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_ongpadl_torndown(
+			struct vmbus_channel_message_header *hdr)
+{
+	struct vmbus_channel_gpadl_torndown *gpadl_torndown;
+	struct vmbus_channel_msginfo *msginfo;
+	struct vmbus_channel_message_header *requestheader;
+	struct vmbus_channel_gpadl_teardown *gpadl_teardown;
+	unsigned long flags;
+
+	gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
+
+	/*
+	 * Find the open msg, copy the result and signal/unblock the wait event
+	 */
+	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+	list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+				msglistentry) {
+		requestheader =
+			(struct vmbus_channel_message_header *)msginfo->msg;
+
+		if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
+			gpadl_teardown =
+			(struct vmbus_channel_gpadl_teardown *)requestheader;
+
+			if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
+				memcpy(&msginfo->response.gpadl_torndown,
+				       gpadl_torndown,
+				       sizeof(
+					struct vmbus_channel_gpadl_torndown));
+				complete(&msginfo->waitevent);
+				break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/*
+ * vmbus_onversion_response - Version response handler
+ *
+ * This is invoked when we received a response to our initiate contact request.
+ * Find the matching request, copy the response and signal the requesting
+ * thread.
+ */
+static void vmbus_onversion_response(
+		struct vmbus_channel_message_header *hdr)
+{
+	struct vmbus_channel_msginfo *msginfo;
+	struct vmbus_channel_message_header *requestheader;
+	struct vmbus_channel_initiate_contact *initiate;
+	struct vmbus_channel_version_response *version_response;
+	unsigned long flags;
+
+	version_response = (struct vmbus_channel_version_response *)hdr;
+	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
+
+	list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
+				msglistentry) {
+		requestheader =
+			(struct vmbus_channel_message_header *)msginfo->msg;
+
+		if (requestheader->msgtype ==
+		    CHANNELMSG_INITIATE_CONTACT) {
+			initiate =
+			(struct vmbus_channel_initiate_contact *)requestheader;
+			memcpy(&msginfo->response.version_response,
+			      version_response,
+			      sizeof(struct vmbus_channel_version_response));
+			complete(&msginfo->waitevent);
+		}
+	}
+	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
+}
+
+/* Channel message dispatch table */
+static struct vmbus_channel_message_table_entry
+	channel_message_table[CHANNELMSG_COUNT] = {
+	{CHANNELMSG_INVALID,			NULL},
+	{CHANNELMSG_OFFERCHANNEL,		vmbus_onoffer},
+	{CHANNELMSG_RESCIND_CHANNELOFFER,	vmbus_onoffer_rescind},
+	{CHANNELMSG_REQUESTOFFERS,		NULL},
+	{CHANNELMSG_ALLOFFERS_DELIVERED,	vmbus_onoffers_delivered},
+	{CHANNELMSG_OPENCHANNEL,		NULL},
+	{CHANNELMSG_OPENCHANNEL_RESULT,	vmbus_onopen_result},
+	{CHANNELMSG_CLOSECHANNEL,		NULL},
+	{CHANNELMSG_GPADL_HEADER,		NULL},
+	{CHANNELMSG_GPADL_BODY,		NULL},
+	{CHANNELMSG_GPADL_CREATED,		vmbus_ongpadl_created},
+	{CHANNELMSG_GPADL_TEARDOWN,		NULL},
+	{CHANNELMSG_GPADL_TORNDOWN,		vmbus_ongpadl_torndown},
+	{CHANNELMSG_RELID_RELEASED,		NULL},
+	{CHANNELMSG_INITIATE_CONTACT,		NULL},
+	{CHANNELMSG_VERSION_RESPONSE,		vmbus_onversion_response},
+	{CHANNELMSG_UNLOAD,			NULL},
+};
+
+/*
+ * vmbus_onmessage - Handler for channel protocol messages.
+ *
+ * This is invoked in the vmbus worker thread context.
+ */
+void vmbus_onmessage(void *context)
+{
+	struct hv_message *msg = context;
+	struct vmbus_channel_message_header *hdr;
+	int size;
+
+	hdr = (struct vmbus_channel_message_header *)msg->u.payload;
+	size = msg->header.payload_size;
+
+	if (hdr->msgtype >= CHANNELMSG_COUNT) {
+		pr_err("Received invalid channel message type %d size %d\n",
+			   hdr->msgtype, size);
+		print_hex_dump_bytes("", DUMP_PREFIX_NONE,
+				     (unsigned char *)msg->u.payload, size);
+		return;
+	}
+
+	if (channel_message_table[hdr->msgtype].message_handler)
+		channel_message_table[hdr->msgtype].message_handler(hdr);
+	else
+		pr_err("Unhandled channel message type %d\n", hdr->msgtype);
+}
+
+/*
+ * vmbus_request_offers - Send a request to get all our pending offers.
+ */
+int vmbus_request_offers(void)
+{
+	struct vmbus_channel_message_header *msg;
+	struct vmbus_channel_msginfo *msginfo;
+	int ret, t;
+
+	msginfo = kmalloc(sizeof(*msginfo) +
+			  sizeof(struct vmbus_channel_message_header),
+			  GFP_KERNEL);
+	if (!msginfo)
+		return -ENOMEM;
+
+	init_completion(&msginfo->waitevent);
+
+	msg = (struct vmbus_channel_message_header *)msginfo->msg;
+
+	msg->msgtype = CHANNELMSG_REQUESTOFFERS;
+
+
+	ret = vmbus_post_msg(msg,
+			       sizeof(struct vmbus_channel_message_header));
+	if (ret != 0) {
+		pr_err("Unable to request offers - %d\n", ret);
+
+		goto cleanup;
+	}
+
+	t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+
+
+cleanup:
+	kfree(msginfo);
+
+	return ret;
+}
+
+/* eof */