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Date:	Thu, 28 Jul 2016 11:15:17 +0300
From:	Amir Levy <amir.jer.levy@...el.com>
To:	andreas.noever@...il.com, gregkh@...uxfoundation.org,
	bhelgaas@...gle.com, corbet@....net
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	netdev@...r.kernel.org, linux-doc@...r.kernel.org,
	thunderbolt-linux@...el.com, mika.westerberg@...el.com,
	tomas.winkler@...el.com, Amir Levy <amir.jer.levy@...el.com>
Subject: [PATCH v5 4/8] thunderbolt: Communication with the ICM (firmware)

Firmware-based (a.k.a ICM - Intel Connection Manager) controller is
used for establishing and maintaining the Thunderbolt Networking
connection. We need to be able to communicate with it.

Signed-off-by: Amir Levy <amir.jer.levy@...el.com>
---
 drivers/thunderbolt/Makefile      |    1 +
 drivers/thunderbolt/icm/Makefile  |   28 +
 drivers/thunderbolt/icm/icm_nhi.c | 1343 +++++++++++++++++++++++++++++++++++++
 drivers/thunderbolt/icm/icm_nhi.h |   93 +++
 drivers/thunderbolt/icm/net.h     |  200 ++++++
 5 files changed, 1665 insertions(+)
 create mode 100644 drivers/thunderbolt/icm/Makefile
 create mode 100644 drivers/thunderbolt/icm/icm_nhi.c
 create mode 100644 drivers/thunderbolt/icm/icm_nhi.h
 create mode 100644 drivers/thunderbolt/icm/net.h

diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
index 7a85bd1..b6aa6a3 100644
--- a/drivers/thunderbolt/Makefile
+++ b/drivers/thunderbolt/Makefile
@@ -1,3 +1,4 @@
 obj-${CONFIG_THUNDERBOLT_APPLE} := thunderbolt.o
 thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel_pci.o eeprom.o
 
+obj-${CONFIG_THUNDERBOLT_ICM} += icm/
diff --git a/drivers/thunderbolt/icm/Makefile b/drivers/thunderbolt/icm/Makefile
new file mode 100644
index 0000000..3adfc35
--- /dev/null
+++ b/drivers/thunderbolt/icm/Makefile
@@ -0,0 +1,28 @@
+################################################################################
+#
+# Intel Thunderbolt(TM) driver
+# Copyright(c) 2014 - 2016 Intel Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# The full GNU General Public License is included in this distribution in
+# the file called "COPYING".
+#
+# Contact Information:
+# Intel Thunderbolt Mailing List <thunderbolt-software@...ts.01.org>
+# Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+#
+################################################################################
+
+obj-${CONFIG_THUNDERBOLT_ICM} += thunderbolt-icm.o
+thunderbolt-icm-objs := icm_nhi.o
diff --git a/drivers/thunderbolt/icm/icm_nhi.c b/drivers/thunderbolt/icm/icm_nhi.c
new file mode 100644
index 0000000..2106dea
--- /dev/null
+++ b/drivers/thunderbolt/icm/icm_nhi.c
@@ -0,0 +1,1343 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel 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, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * Intel Thunderbolt Mailing List <thunderbolt-software@...ts.01.org>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ ******************************************************************************/
+
+#include <linux/printk.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include "icm_nhi.h"
+#include "net.h"
+
+#define NHI_GENL_VERSION 1
+#define NHI_GENL_NAME DRV_NAME
+
+#define DEVICE_DATA(num_ports, dma_port, nvm_ver_offset, nvm_auth_on_boot,\
+		    support_full_e2e) \
+	((num_ports) | ((dma_port) << 4) | ((nvm_ver_offset) << 10) | \
+	 ((nvm_auth_on_boot) << 22) | ((support_full_e2e) << 23))
+#define DEVICE_DATA_NUM_PORTS(device_data) ((device_data) & 0xf)
+#define DEVICE_DATA_DMA_PORT(device_data) (((device_data) >> 4) & 0x3f)
+#define DEVICE_DATA_NVM_VER_OFFSET(device_data) (((device_data) >> 10) & 0xfff)
+#define DEVICE_DATA_NVM_AUTH_ON_BOOT(device_data) (((device_data) >> 22) & 0x1)
+#define DEVICE_DATA_SUPPORT_FULL_E2E(device_data) (((device_data) >> 23) & 0x1)
+
+#define USEC_TO_256_NSECS(usec) DIV_ROUND_UP((usec) * NSEC_PER_USEC, 256)
+
+/*
+ * FW->SW responses
+ * RC = response code
+ */
+enum {
+	RC_GET_TBT_TOPOLOGY = 1,
+	RC_GET_VIDEO_RESOURCES_DATA,
+	RC_DRV_READY,
+	RC_APPROVE_PCI_CONNEXION,
+	RC_CHALLENGE_PCI_CONNEXION,
+	RC_ADD_DEVICE_AND_KEY,
+	RC_INTER_DOMAIN_PKT_SENT = 8,
+	RC_APPROVE_INTER_DOMAIN_CONNEXION = 0x10
+};
+
+/*
+ * FW->SW notifications
+ * NC = notification code
+ */
+enum {
+	NC_DEVICE_CONNECTED = 3,
+	NC_DEVICE_DISCONNECTED,
+	NC_DP_DEVICE_CONNECTED_NOT_TUNNELED,
+	NC_INTER_DOMAIN_CONNECTED,
+	NC_INTER_DOMAIN_DISCONNECTED
+};
+
+/* NHI genetlink commands */
+enum {
+	NHI_CMD_UNSPEC,
+	NHI_CMD_SUBSCRIBE,
+	NHI_CMD_UNSUBSCRIBE,
+	NHI_CMD_QUERY_INFORMATION,
+	NHI_CMD_MSG_TO_ICM,
+	NHI_CMD_MSG_FROM_ICM,
+	NHI_CMD_MAILBOX,
+	NHI_CMD_APPROVE_TBT_NETWORKING,
+	NHI_CMD_ICM_IN_SAFE_MODE,
+	__NHI_CMD_MAX,
+};
+#define NHI_CMD_MAX (__NHI_CMD_MAX - 1)
+
+/* NHI genetlink policy */
+static const struct nla_policy nhi_genl_policy[NHI_ATTR_MAX + 1] = {
+	[NHI_ATTR_DRV_VERSION]		= { .type = NLA_NUL_STRING, },
+	[NHI_ATTR_NVM_VER_OFFSET]	= { .type = NLA_U16, },
+	[NHI_ATTR_NUM_PORTS]		= { .type = NLA_U8, },
+	[NHI_ATTR_DMA_PORT]		= { .type = NLA_U8, },
+	[NHI_ATTR_SUPPORT_FULL_E2E]	= { .type = NLA_FLAG, },
+	[NHI_ATTR_MAILBOX_CMD]		= { .type = NLA_U32, },
+	[NHI_ATTR_PDF]			= { .type = NLA_U32, },
+	[NHI_ATTR_MSG_TO_ICM]		= { .type = NLA_BINARY,
+					.len = TBT_ICM_RING_MAX_FRAME_SIZE },
+	[NHI_ATTR_MSG_FROM_ICM]		= { .type = NLA_BINARY,
+					.len = TBT_ICM_RING_MAX_FRAME_SIZE },
+};
+
+/* NHI genetlink family */
+static struct genl_family nhi_genl_family = {
+	.id		= GENL_ID_GENERATE,
+	.hdrsize	= FIELD_SIZEOF(struct tbt_nhi_ctxt, id),
+	.name		= NHI_GENL_NAME,
+	.version	= NHI_GENL_VERSION,
+	.maxattr	= NHI_ATTR_MAX,
+};
+
+static LIST_HEAD(controllers_list);
+static DECLARE_RWSEM(controllers_list_rwsem);
+static atomic_t subscribers = ATOMIC_INIT(0);
+static u32 portid;
+
+static bool nhi_nvm_authenticated(struct tbt_nhi_ctxt *nhi_ctxt)
+{
+	enum icm_operation_mode op_mode;
+	u32 *msg_head, port_id, reg;
+	struct sk_buff *skb;
+	int i;
+
+	if (!nhi_ctxt->nvm_auth_on_boot)
+		return true;
+
+	/*
+	 * The check for NVM authentication can take time for iCM,
+	 * especially in low power configuration.
+	 */
+	for (i = 0; i < 5; i++) {
+		u32 status = ioread32(nhi_ctxt->iobase + REG_FW_STS);
+
+		if (status & REG_FW_STS_NVM_AUTH_DONE)
+			break;
+
+		msleep(30);
+	}
+	/*
+	 * The check for authentication is done after checking if iCM
+	 * is present so it shouldn't reach the max tries (=5).
+	 * Anyway, the check for full functionality below covers the error case.
+	 */
+	reg = ioread32(nhi_ctxt->iobase + REG_OUTMAIL_CMD);
+	op_mode = (reg & REG_OUTMAIL_CMD_OP_MODE_MASK) >>
+		  REG_OUTMAIL_CMD_OP_MODE_SHIFT;
+	if (op_mode == FULL_FUNCTIONALITY)
+		return true;
+
+	dev_warn(&nhi_ctxt->pdev->dev, "controller id %#x is in operation mode %#x status %#lx\n",
+		 nhi_ctxt->id, op_mode,
+		 (reg & REG_OUTMAIL_CMD_STS_MASK)>>REG_OUTMAIL_CMD_STS_SHIFT);
+
+	skb = genlmsg_new(NLMSG_ALIGN(nhi_genl_family.hdrsize), GFP_KERNEL);
+	if (!skb) {
+		dev_err(&nhi_ctxt->pdev->dev, "genlmsg_new failed: not enough memory to send controller operational mode\n");
+		return false;
+	}
+
+	/* keeping port_id into a local variable for next use */
+	port_id = portid;
+	msg_head = genlmsg_put(skb, port_id, 0, &nhi_genl_family, 0,
+			       NHI_CMD_ICM_IN_SAFE_MODE);
+	if (!msg_head) {
+		nlmsg_free(skb);
+		dev_err(&nhi_ctxt->pdev->dev, "genlmsg_put failed: not enough memory to send controller operational mode\n");
+		return false;
+	}
+
+	*msg_head = nhi_ctxt->id;
+
+	genlmsg_end(skb, msg_head);
+
+	genlmsg_unicast(&init_net, skb, port_id);
+
+	return false;
+}
+
+int nhi_send_message(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
+		     u32 msg_len, const u8 *msg, bool ignore_icm_resp)
+{
+	u32 prod_cons, prod, cons, attr;
+	struct tbt_icm_ring_shared_memory *shared_mem;
+	void __iomem *reg = TBT_RING_CONS_PROD_REG(nhi_ctxt->iobase,
+						   REG_TX_RING_BASE,
+						   TBT_ICM_RING_NUM);
+
+	dev_dbg(&nhi_ctxt->pdev->dev,
+		"send msg: controller id %#x pdf %u cmd %hhu msg len %u\n",
+		nhi_ctxt->id, pdf, msg[3], msg_len);
+
+	if (nhi_ctxt->d0_exit) {
+		dev_notice(&nhi_ctxt->pdev->dev,
+			   "controller id %#x is exiting D0\n",
+			   nhi_ctxt->id);
+		return -ENODEV;
+	}
+
+	prod_cons = ioread32(reg);
+	prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+	cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+	if (prod >= TBT_ICM_RING_NUM_TX_BUFS) {
+		dev_warn(&nhi_ctxt->pdev->dev,
+			 "controller id %#x producer %u out of range\n",
+			 nhi_ctxt->id, prod);
+		return -ENODEV;
+	}
+	if (TBT_TX_RING_FULL(prod, cons, TBT_ICM_RING_NUM_TX_BUFS)) {
+		dev_err(&nhi_ctxt->pdev->dev,
+			"controller id %#x TX ring full\n",
+			nhi_ctxt->id);
+		return -ENOSPC;
+	}
+
+	attr = (msg_len << DESC_ATTR_LEN_SHIFT) & DESC_ATTR_LEN_MASK;
+	attr |= (pdf << DESC_ATTR_EOF_SHIFT) & DESC_ATTR_EOF_MASK;
+
+	shared_mem = nhi_ctxt->icm_ring_shared_mem;
+	shared_mem->tx_buf_desc[prod].attributes = cpu_to_le32(attr);
+
+	memcpy(shared_mem->tx_buf[prod], msg, msg_len);
+
+	prod_cons &= ~REG_RING_PROD_MASK;
+	prod_cons |= (((prod + 1) % TBT_ICM_RING_NUM_TX_BUFS) <<
+		      REG_RING_PROD_SHIFT) & REG_RING_PROD_MASK;
+
+	if (likely(!nhi_ctxt->wait_for_icm_resp))
+		nhi_ctxt->wait_for_icm_resp = true;
+	else
+		dev_dbg(&nhi_ctxt->pdev->dev,
+			"controller id %#x wait_for_icm_resp should have been cleared\n",
+			nhi_ctxt->id);
+
+	nhi_ctxt->ignore_icm_resp = ignore_icm_resp;
+
+	iowrite32(prod_cons, reg);
+
+	return 0;
+}
+
+static int nhi_send_driver_ready_command(struct tbt_nhi_ctxt *nhi_ctxt)
+{
+	struct driver_ready_command {
+		__be32 req_code;
+		__be32 crc;
+	} drv_rdy_cmd = {
+		.req_code = cpu_to_be32(CC_DRV_READY),
+	};
+	u32 crc32;
+
+	crc32 = __crc32c_le(~0, (unsigned char const *)&drv_rdy_cmd,
+			    offsetof(struct driver_ready_command, crc));
+
+	drv_rdy_cmd.crc = cpu_to_be32(~crc32);
+
+	return nhi_send_message(nhi_ctxt, PDF_SW_TO_FW_COMMAND,
+				sizeof(drv_rdy_cmd), (u8 *)&drv_rdy_cmd,
+				false);
+}
+
+/**
+ * nhi_search_ctxt - search by id the controllers_list.
+ * Should be called under controllers_list_rwsem (can be reader lock).
+ *
+ * @id: id of the controller
+ *
+ * Return: driver context if found, NULL otherwise.
+ */
+static struct tbt_nhi_ctxt *nhi_search_ctxt(u32 id)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt;
+
+	list_for_each_entry(nhi_ctxt, &controllers_list, node)
+		if (nhi_ctxt->id == id)
+			return nhi_ctxt;
+
+	return NULL;
+}
+
+static int nhi_genl_subscribe(__always_unused struct sk_buff *u_skb,
+			      struct genl_info *info)
+			      __acquires(&nhi_ctxt->send_sem)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt;
+
+	/*
+	 * To send driver ready command to iCM, need at least one subscriber
+	 * that will handle the response.
+	 * Currently the assumption is one user mode daemon as subscriber
+	 * so one portid global variable (without locking).
+	 */
+	if (atomic_inc_return(&subscribers) >= 1) {
+		portid = info->snd_portid;
+		down_read(&controllers_list_rwsem);
+		list_for_each_entry(nhi_ctxt, &controllers_list, node) {
+			int res;
+
+			if (nhi_ctxt->d0_exit ||
+			    !nhi_nvm_authenticated(nhi_ctxt))
+				continue;
+
+			res = down_timeout(&nhi_ctxt->send_sem,
+					   msecs_to_jiffies(10*MSEC_PER_SEC));
+			if (res) {
+				dev_err(&nhi_ctxt->pdev->dev,
+					"%s: controller id %#x timeout on send semaphore\n",
+					__func__, nhi_ctxt->id);
+				continue;
+			}
+
+			if (!mutex_trylock(&nhi_ctxt->d0_exit_send_mutex)) {
+				up(&nhi_ctxt->send_sem);
+				continue;
+			}
+
+			res = nhi_send_driver_ready_command(nhi_ctxt);
+
+			mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+			if (res)
+				up(&nhi_ctxt->send_sem);
+		}
+		up_read(&controllers_list_rwsem);
+	}
+
+	return 0;
+}
+
+static int nhi_genl_unsubscribe(__always_unused struct sk_buff *u_skb,
+				__always_unused struct genl_info *info)
+{
+	atomic_dec_if_positive(&subscribers);
+
+	return 0;
+}
+
+static int nhi_genl_query_information(__always_unused struct sk_buff *u_skb,
+				      struct genl_info *info)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt;
+	struct sk_buff *skb;
+	bool msg_too_long;
+	int res = -ENODEV;
+	u32 *msg_head;
+
+	if (!info || !info->userhdr)
+		return -EINVAL;
+
+	skb = genlmsg_new(NLMSG_ALIGN(nhi_genl_family.hdrsize) +
+			  nla_total_size(sizeof(DRV_VERSION)) +
+			  nla_total_size(sizeof(nhi_ctxt->nvm_ver_offset)) +
+			  nla_total_size(sizeof(nhi_ctxt->num_ports)) +
+			  nla_total_size(sizeof(nhi_ctxt->dma_port)) +
+			  nla_total_size(0),	/* nhi_ctxt->support_full_e2e */
+			  GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	msg_head = genlmsg_put_reply(skb, info, &nhi_genl_family, 0,
+				     NHI_CMD_QUERY_INFORMATION);
+	if (!msg_head) {
+		res = -ENOMEM;
+		goto genl_put_reply_failure;
+	}
+
+	down_read(&controllers_list_rwsem);
+
+	nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+	if (nhi_ctxt && !nhi_ctxt->d0_exit) {
+		*msg_head = nhi_ctxt->id;
+
+		msg_too_long = !!nla_put_string(skb, NHI_ATTR_DRV_VERSION,
+						DRV_VERSION);
+
+		msg_too_long = msg_too_long ||
+			       nla_put_u16(skb, NHI_ATTR_NVM_VER_OFFSET,
+					   nhi_ctxt->nvm_ver_offset);
+
+		msg_too_long = msg_too_long ||
+			       nla_put_u8(skb, NHI_ATTR_NUM_PORTS,
+					  nhi_ctxt->num_ports);
+
+		msg_too_long = msg_too_long ||
+			       nla_put_u8(skb, NHI_ATTR_DMA_PORT,
+					  nhi_ctxt->dma_port);
+
+		if (msg_too_long) {
+			res = -EMSGSIZE;
+			goto release_ctl_list_lock;
+		}
+
+		if (nhi_ctxt->support_full_e2e &&
+		    nla_put_flag(skb, NHI_ATTR_SUPPORT_FULL_E2E)) {
+			res = -EMSGSIZE;
+			goto release_ctl_list_lock;
+		}
+		up_read(&controllers_list_rwsem);
+
+		genlmsg_end(skb, msg_head);
+
+		return genlmsg_reply(skb, info);
+	}
+
+release_ctl_list_lock:
+	up_read(&controllers_list_rwsem);
+	genlmsg_cancel(skb, msg_head);
+
+genl_put_reply_failure:
+	nlmsg_free(skb);
+
+	return res;
+}
+
+static int nhi_genl_msg_to_icm(__always_unused struct sk_buff *u_skb,
+			       struct genl_info *info)
+			       __acquires(&nhi_ctxt->send_sem)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt;
+	int res = -ENODEV;
+	int msg_len;
+	void *msg;
+
+	if (!info || !info->userhdr || !info->attrs ||
+	    !info->attrs[NHI_ATTR_PDF] || !info->attrs[NHI_ATTR_MSG_TO_ICM])
+		return -EINVAL;
+
+	msg_len = nla_len(info->attrs[NHI_ATTR_MSG_TO_ICM]);
+	if (msg_len > TBT_ICM_RING_MAX_FRAME_SIZE)
+		return -ENOBUFS;
+
+	msg = nla_data(info->attrs[NHI_ATTR_MSG_TO_ICM]);
+
+	down_read(&controllers_list_rwsem);
+	nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+	if (nhi_ctxt && !nhi_ctxt->d0_exit) {
+		/*
+		 * waiting 10 seconds to receive a FW response
+		 * if not, just give up and pop up an error
+		 */
+		res = down_timeout(&nhi_ctxt->send_sem,
+				   msecs_to_jiffies(10 * MSEC_PER_SEC));
+		if (res) {
+			void __iomem *rx_prod_cons = TBT_RING_CONS_PROD_REG(
+							nhi_ctxt->iobase,
+							REG_RX_RING_BASE,
+							TBT_ICM_RING_NUM);
+			void __iomem *tx_prod_cons = TBT_RING_CONS_PROD_REG(
+							nhi_ctxt->iobase,
+							REG_TX_RING_BASE,
+							TBT_ICM_RING_NUM);
+			dev_err(&nhi_ctxt->pdev->dev,
+				"controller id %#x timeout on send semaphore\n",
+				nhi_ctxt->id);
+			dev_dbg(&nhi_ctxt->pdev->dev,
+				"controller id %#x, tx prod&cons=%#x, rx prod&cons=%#x\n",
+				nhi_ctxt->id,
+				ioread32(tx_prod_cons),
+				ioread32(rx_prod_cons));
+			goto release_ctl_list_lock;
+		}
+
+		if (!mutex_trylock(&nhi_ctxt->d0_exit_send_mutex)) {
+			up(&nhi_ctxt->send_sem);
+			dev_notice(&nhi_ctxt->pdev->dev,
+				   "controller id %#x is exiting D0\n",
+				   nhi_ctxt->id);
+			goto release_ctl_list_lock;
+		}
+
+		up_read(&controllers_list_rwsem);
+
+		res = nhi_send_message(nhi_ctxt,
+				       nla_get_u32(info->attrs[NHI_ATTR_PDF]),
+				       msg_len, msg, false);
+
+		mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+		if (res)
+			up(&nhi_ctxt->send_sem);
+
+		return res;
+	}
+
+release_ctl_list_lock:
+	up_read(&controllers_list_rwsem);
+	return res;
+}
+
+int nhi_mailbox(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd, u32 data, bool deinit)
+{
+	u32 delay = deinit ? U32_C(20) : U32_C(100);
+	int i;
+
+	dev_dbg(&nhi_ctxt->pdev->dev, "controller id %#x mbox command %#x\n",
+		nhi_ctxt->id, cmd);
+	iowrite32(data, nhi_ctxt->iobase + REG_INMAIL_DATA);
+	iowrite32(cmd, nhi_ctxt->iobase + REG_INMAIL_CMD);
+
+#define NHI_INMAIL_CMD_RETRIES 50
+	/*
+	 * READ_ONCE fetches the value of nhi_ctxt->d0_exit every time
+	 * and avoid optimization.
+	 * deinit = true to continue the loop even if D3 process has been
+	 * carried out.
+	 */
+	for (i = 0; (i < NHI_INMAIL_CMD_RETRIES) &&
+		    (deinit || !READ_ONCE(nhi_ctxt->d0_exit)); i++) {
+		cmd = ioread32(nhi_ctxt->iobase + REG_INMAIL_CMD);
+
+		if (cmd & REG_INMAIL_CMD_ERROR) {
+			/*
+			 * when deinit this just informative as it may
+			 * due to unplug of the cable
+			 */
+			if (!deinit)
+				dev_err(&nhi_ctxt->pdev->dev,
+					"inmail error after %d msecs\n",
+					i * delay);
+			else
+				dev_info(&nhi_ctxt->pdev->dev,
+					 "inmail error after %d msecs\n",
+					 i * delay);
+
+			return -EIO;
+		}
+
+		if (!(cmd & REG_INMAIL_CMD_REQUEST))
+			break;
+
+		msleep(delay);
+	}
+
+	if (i == NHI_INMAIL_CMD_RETRIES) {
+		if (!deinit)
+			dev_err(&nhi_ctxt->pdev->dev, "inmail timeout\n");
+		else
+			dev_info(&nhi_ctxt->pdev->dev, "inmail timeout\n");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int nhi_mailbox_generic(struct tbt_nhi_ctxt *nhi_ctxt, u32 mb_cmd)
+	__releases(&controllers_list_rwsem)
+{
+	int res = -ENODEV;
+
+	if (mutex_lock_interruptible(&nhi_ctxt->mailbox_mutex)) {
+		res = -ERESTART;
+		goto release_ctl_list_lock;
+	}
+
+	if (!mutex_trylock(&nhi_ctxt->d0_exit_mailbox_mutex)) {
+		mutex_unlock(&nhi_ctxt->mailbox_mutex);
+		dev_notice(&nhi_ctxt->pdev->dev,
+			   "controller id %#x is exiting D0\n",
+			   nhi_ctxt->id);
+		goto release_ctl_list_lock;
+	}
+
+	up_read(&controllers_list_rwsem);
+
+	res = nhi_mailbox(nhi_ctxt, mb_cmd, 0, false);
+	mutex_unlock(&nhi_ctxt->d0_exit_mailbox_mutex);
+	mutex_unlock(&nhi_ctxt->mailbox_mutex);
+
+	return res;
+
+release_ctl_list_lock:
+	up_read(&controllers_list_rwsem);
+	return res;
+}
+
+static int nhi_genl_mailbox(__always_unused struct sk_buff *u_skb,
+			    struct genl_info *info)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt;
+	u32 cmd, mb_cmd;
+
+	if (!info || !info->userhdr || !info->attrs ||
+	    !info->attrs[NHI_ATTR_MAILBOX_CMD])
+		return -EINVAL;
+
+	cmd = nla_get_u32(info->attrs[NHI_ATTR_MAILBOX_CMD]);
+	mb_cmd = ((cmd << REG_INMAIL_CMD_CMD_SHIFT) &
+		  REG_INMAIL_CMD_CMD_MASK) | REG_INMAIL_CMD_REQUEST;
+
+	down_read(&controllers_list_rwsem);
+
+	nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+	if (nhi_ctxt && !nhi_ctxt->d0_exit)
+		return nhi_mailbox_generic(nhi_ctxt, mb_cmd);
+
+	up_read(&controllers_list_rwsem);
+	return -ENODEV;
+}
+
+
+static int nhi_genl_send_msg(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
+			     const u8 *msg, u32 msg_len)
+{
+	u32 *msg_head, port_id;
+	struct sk_buff *skb;
+	int res;
+
+	if (atomic_read(&subscribers) < 1) {
+		dev_notice(&nhi_ctxt->pdev->dev, "no subscribers for controller id %#x, dropping message - pdf %u cmd %hhu msg len %u\n",
+			   nhi_ctxt->id, pdf, msg[3], msg_len);
+		return -ENOTCONN;
+	}
+
+	skb = genlmsg_new(NLMSG_ALIGN(nhi_genl_family.hdrsize) +
+			  nla_total_size(msg_len) +
+			  nla_total_size(sizeof(pdf)),
+			  GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	port_id = portid;
+	msg_head = genlmsg_put(skb, port_id, 0, &nhi_genl_family, 0,
+			       NHI_CMD_MSG_FROM_ICM);
+	if (!msg_head) {
+		res = -ENOMEM;
+		goto genl_put_reply_failure;
+	}
+
+	*msg_head = nhi_ctxt->id;
+
+	if (nla_put_u32(skb, NHI_ATTR_PDF, pdf) ||
+	    nla_put(skb, NHI_ATTR_MSG_FROM_ICM, msg_len, msg)) {
+		res = -EMSGSIZE;
+		goto nla_put_failure;
+	}
+
+	genlmsg_end(skb, msg_head);
+
+	return genlmsg_unicast(&init_net, skb, port_id);
+
+nla_put_failure:
+	genlmsg_cancel(skb, msg_head);
+genl_put_reply_failure:
+	nlmsg_free(skb);
+
+	return res;
+}
+
+static bool nhi_msg_from_icm_analysis(struct tbt_nhi_ctxt *nhi_ctxt,
+					enum pdf_value pdf,
+					const u8 *msg, u32 msg_len)
+{
+	/*
+	 * preparation for messages that won't be sent,
+	 * currently unused in this patch.
+	 */
+	bool send_event = true;
+
+	switch (pdf) {
+	case PDF_ERROR_NOTIFICATION:
+		dev_err(&nhi_ctxt->pdev->dev,
+			"controller id %#x PDF_ERROR_NOTIFICATION %hhu msg len %u\n",
+			nhi_ctxt->id, msg[11], msg_len);
+		/* fallthrough */
+	case PDF_WRITE_CONFIGURATION_REGISTERS:
+		/* fallthrough */
+	case PDF_READ_CONFIGURATION_REGISTERS:
+		if (nhi_ctxt->wait_for_icm_resp) {
+			nhi_ctxt->wait_for_icm_resp = false;
+			up(&nhi_ctxt->send_sem);
+		}
+		break;
+
+	case PDF_FW_TO_SW_RESPONSE:
+		if (nhi_ctxt->wait_for_icm_resp) {
+			nhi_ctxt->wait_for_icm_resp = false;
+			up(&nhi_ctxt->send_sem);
+		}
+		break;
+
+	default:
+		dev_warn(&nhi_ctxt->pdev->dev,
+			 "controller id %#x pdf %u isn't handled/expected\n",
+			 nhi_ctxt->id, pdf);
+		break;
+	}
+
+	return send_event;
+}
+
+static void nhi_msgs_from_icm(struct work_struct *work)
+			      __releases(&nhi_ctxt->send_sem)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt = container_of(work, typeof(*nhi_ctxt),
+						     icm_msgs_work);
+	void __iomem *reg = TBT_RING_CONS_PROD_REG(nhi_ctxt->iobase,
+						   REG_RX_RING_BASE,
+						   TBT_ICM_RING_NUM);
+	u32 prod_cons, prod, cons;
+
+	prod_cons = ioread32(reg);
+	prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+	cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+	if (prod >= TBT_ICM_RING_NUM_RX_BUFS) {
+		dev_warn(&nhi_ctxt->pdev->dev,
+			 "controller id %#x producer %u out of range\n",
+			 nhi_ctxt->id, prod);
+		return;
+	}
+	if (cons >= TBT_ICM_RING_NUM_RX_BUFS) {
+		dev_warn(&nhi_ctxt->pdev->dev,
+			 "controller id %#x consumer %u out of range\n",
+			 nhi_ctxt->id, cons);
+		return;
+	}
+
+	while (!TBT_RX_RING_EMPTY(prod, cons, TBT_ICM_RING_NUM_RX_BUFS) &&
+	       !nhi_ctxt->d0_exit) {
+		struct tbt_buf_desc *rx_desc;
+		u8 *msg;
+		u32 msg_len;
+		enum pdf_value pdf;
+		bool send_event;
+
+		cons = (cons + 1) % TBT_ICM_RING_NUM_RX_BUFS;
+		rx_desc = &(nhi_ctxt->icm_ring_shared_mem->rx_buf_desc[cons]);
+		if (!(le32_to_cpu(rx_desc->attributes) &
+		      DESC_ATTR_DESC_DONE)) {
+			usleep_range(10, 20);
+			if (unlikely(!(le32_to_cpu(rx_desc->attributes) &
+				       DESC_ATTR_DESC_DONE)))
+				dev_err(&nhi_ctxt->pdev->dev,
+					"controller id %#x buffer %u might not completely processed\n",
+					nhi_ctxt->id, cons);
+		}
+
+		rmb(); /* read the descriptor and the buffer after DD check */
+		pdf = (le32_to_cpu(rx_desc->attributes) & DESC_ATTR_EOF_MASK)
+		      >> DESC_ATTR_EOF_SHIFT;
+		msg = nhi_ctxt->icm_ring_shared_mem->rx_buf[cons];
+		msg_len = (le32_to_cpu(rx_desc->attributes)&DESC_ATTR_LEN_MASK)
+			  >> DESC_ATTR_LEN_SHIFT;
+
+		dev_dbg(&nhi_ctxt->pdev->dev,
+			"%s: controller id %#x pdf %u cmd %hhu msg len %u\n",
+			__func__, nhi_ctxt->id, pdf, msg[3], msg_len);
+
+		send_event = nhi_msg_from_icm_analysis(nhi_ctxt, pdf, msg,
+						       msg_len);
+
+		if (send_event)
+			nhi_genl_send_msg(nhi_ctxt, pdf, msg, msg_len);
+
+		/* set the descriptor for another receive */
+		rx_desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS |
+						  DESC_ATTR_INT_EN);
+		rx_desc->time = 0;
+	}
+
+	/* free the descriptors for more receive */
+	prod_cons &= ~REG_RING_CONS_MASK;
+	prod_cons |= (cons << REG_RING_CONS_SHIFT) & REG_RING_CONS_MASK;
+	iowrite32(prod_cons, reg);
+
+	if (!nhi_ctxt->d0_exit) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&nhi_ctxt->lock, flags);
+		/* enable RX interrupt */
+		RING_INT_ENABLE_RX(nhi_ctxt->iobase, TBT_ICM_RING_NUM,
+				   nhi_ctxt->num_paths);
+
+		spin_unlock_irqrestore(&nhi_ctxt->lock, flags);
+	}
+}
+
+static irqreturn_t nhi_icm_ring_rx_msix(int __always_unused irq, void *data)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt = data;
+
+	spin_lock(&nhi_ctxt->lock);
+	/*
+	 * disable RX interrupt
+	 * We like to allow interrupt mitigation until the work item
+	 * will be completed.
+	 */
+	RING_INT_DISABLE_RX(nhi_ctxt->iobase, TBT_ICM_RING_NUM,
+			    nhi_ctxt->num_paths);
+
+	spin_unlock(&nhi_ctxt->lock);
+
+	schedule_work(&nhi_ctxt->icm_msgs_work);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t nhi_msi(int __always_unused irq, void *data)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt = data;
+	u32 isr0, isr1, imr0, imr1;
+
+	/* clear on read */
+	isr0 = ioread32(nhi_ctxt->iobase + REG_RING_NOTIFY_BASE);
+	isr1 = ioread32(nhi_ctxt->iobase + REG_RING_NOTIFY_BASE +
+							REG_RING_NOTIFY_STEP);
+	if (unlikely(!isr0 && !isr1))
+		return IRQ_NONE;
+
+	spin_lock(&nhi_ctxt->lock);
+
+	imr0 = ioread32(nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE);
+	imr1 = ioread32(nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE +
+			REG_RING_INTERRUPT_STEP);
+	/* disable the arrived interrupts */
+	iowrite32(imr0 & ~isr0,
+		  nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE);
+	iowrite32(imr1 & ~isr1,
+		  nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE +
+		  REG_RING_INTERRUPT_STEP);
+
+	spin_unlock(&nhi_ctxt->lock);
+
+	if (isr0 & REG_RING_INT_RX_PROCESSED(TBT_ICM_RING_NUM,
+					     nhi_ctxt->num_paths))
+		schedule_work(&nhi_ctxt->icm_msgs_work);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * nhi_set_int_vec - Mapping of the MSIX vector entry to the ring
+ * @nhi_ctxt: contains data on NHI controller
+ * @path: ring to be mapped
+ * @msix_msg_id: msix entry to be mapped
+ */
+static inline void nhi_set_int_vec(struct tbt_nhi_ctxt *nhi_ctxt, u32 path,
+				   u8 msix_msg_id)
+{
+	void __iomem *reg;
+	u32 step, shift, ivr;
+
+	if (msix_msg_id % 2)
+		path += nhi_ctxt->num_paths;
+
+	step = path / REG_INT_VEC_ALLOC_PER_REG;
+	shift = (path % REG_INT_VEC_ALLOC_PER_REG) *
+		REG_INT_VEC_ALLOC_FIELD_BITS;
+	reg = nhi_ctxt->iobase + REG_INT_VEC_ALLOC_BASE +
+					(step * REG_INT_VEC_ALLOC_STEP);
+	ivr = ioread32(reg) & ~(REG_INT_VEC_ALLOC_FIELD_MASK << shift);
+	iowrite32(ivr | (msix_msg_id << shift), reg);
+}
+
+/* NHI genetlink operations array */
+static const struct genl_ops nhi_ops[] = {
+	{
+		.cmd = NHI_CMD_SUBSCRIBE,
+		.policy = nhi_genl_policy,
+		.doit = nhi_genl_subscribe,
+	},
+	{
+		.cmd = NHI_CMD_UNSUBSCRIBE,
+		.policy = nhi_genl_policy,
+		.doit = nhi_genl_unsubscribe,
+	},
+	{
+		.cmd = NHI_CMD_QUERY_INFORMATION,
+		.policy = nhi_genl_policy,
+		.doit = nhi_genl_query_information,
+	},
+	{
+		.cmd = NHI_CMD_MSG_TO_ICM,
+		.policy = nhi_genl_policy,
+		.doit = nhi_genl_msg_to_icm,
+		.flags = GENL_ADMIN_PERM,
+	},
+	{
+		.cmd = NHI_CMD_MAILBOX,
+		.policy = nhi_genl_policy,
+		.doit = nhi_genl_mailbox,
+		.flags = GENL_ADMIN_PERM,
+	},
+};
+
+static int nhi_suspend(struct device *dev) __releases(&nhi_ctxt->send_sem)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(to_pci_dev(dev));
+	void __iomem *rx_reg, *tx_reg;
+	u32 rx_reg_val, tx_reg_val;
+
+	/* must be after negotiation_events, since messages might be sent */
+	nhi_ctxt->d0_exit = true;
+
+	rx_reg = nhi_ctxt->iobase + REG_RX_OPTIONS_BASE +
+		 (TBT_ICM_RING_NUM * REG_OPTS_STEP);
+	rx_reg_val = ioread32(rx_reg) & ~REG_OPTS_E2E_EN;
+	tx_reg = nhi_ctxt->iobase + REG_TX_OPTIONS_BASE +
+		 (TBT_ICM_RING_NUM * REG_OPTS_STEP);
+	tx_reg_val = ioread32(tx_reg) & ~REG_OPTS_E2E_EN;
+	/* disable RX flow control  */
+	iowrite32(rx_reg_val, rx_reg);
+	/* disable TX flow control  */
+	iowrite32(tx_reg_val, tx_reg);
+	/* disable RX ring  */
+	iowrite32(rx_reg_val & ~REG_OPTS_VALID, rx_reg);
+
+	mutex_lock(&nhi_ctxt->d0_exit_mailbox_mutex);
+	mutex_lock(&nhi_ctxt->d0_exit_send_mutex);
+
+	cancel_work_sync(&nhi_ctxt->icm_msgs_work);
+
+	if (nhi_ctxt->wait_for_icm_resp) {
+		nhi_ctxt->wait_for_icm_resp = false;
+		nhi_ctxt->ignore_icm_resp = false;
+		/*
+		 * if there is response, it is lost, so unlock the send
+		 * for the next resume.
+		 */
+		up(&nhi_ctxt->send_sem);
+	}
+
+	mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+	mutex_unlock(&nhi_ctxt->d0_exit_mailbox_mutex);
+
+	/* wait for all TX to finish  */
+	usleep_range(5 * USEC_PER_MSEC, 7 * USEC_PER_MSEC);
+
+	/* disable all interrupts */
+	iowrite32(0, nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE);
+	/* disable TX ring  */
+	iowrite32(tx_reg_val & ~REG_OPTS_VALID, tx_reg);
+
+	return 0;
+}
+
+static int nhi_resume(struct device *dev) __acquires(&nhi_ctxt->send_sem)
+{
+	dma_addr_t phys;
+	struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(to_pci_dev(dev));
+	struct tbt_buf_desc *desc;
+	void __iomem *iobase = nhi_ctxt->iobase;
+	void __iomem *reg;
+	int i;
+
+	if (nhi_ctxt->msix_entries) {
+		iowrite32(ioread32(iobase + REG_DMA_MISC) |
+						REG_DMA_MISC_INT_AUTO_CLEAR,
+			  iobase + REG_DMA_MISC);
+		/*
+		 * Vector #0, which is TX complete to ICM,
+		 * isn't been used currently.
+		 */
+		nhi_set_int_vec(nhi_ctxt, 0, 1);
+
+		for (i = 2; i < nhi_ctxt->num_vectors; i++)
+			nhi_set_int_vec(nhi_ctxt, nhi_ctxt->num_paths - (i/2),
+					i);
+	}
+
+	/* configure TX descriptors */
+	for (i = 0, phys = nhi_ctxt->icm_ring_shared_mem_dma_addr;
+	     i < TBT_ICM_RING_NUM_TX_BUFS;
+	     i++, phys += TBT_ICM_RING_MAX_FRAME_SIZE) {
+		desc = &nhi_ctxt->icm_ring_shared_mem->tx_buf_desc[i];
+		desc->phys = cpu_to_le64(phys);
+		desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS);
+	}
+	/* configure RX descriptors */
+	for (i = 0;
+	     i < TBT_ICM_RING_NUM_RX_BUFS;
+	     i++, phys += TBT_ICM_RING_MAX_FRAME_SIZE) {
+		desc = &nhi_ctxt->icm_ring_shared_mem->rx_buf_desc[i];
+		desc->phys = cpu_to_le64(phys);
+		desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS |
+					       DESC_ATTR_INT_EN);
+	}
+
+	/* configure throttling rate for interrupts */
+	for (i = 0, reg = iobase + REG_INT_THROTTLING_RATE;
+	     i < NUM_INT_VECTORS;
+	     i++, reg += REG_INT_THROTTLING_RATE_STEP) {
+		iowrite32(USEC_TO_256_NSECS(128), reg);
+	}
+
+	/* configure TX for ICM ring */
+	reg = iobase + REG_TX_RING_BASE + (TBT_ICM_RING_NUM * REG_RING_STEP);
+	phys = nhi_ctxt->icm_ring_shared_mem_dma_addr +
+		offsetof(struct tbt_icm_ring_shared_memory, tx_buf_desc);
+	iowrite32(lower_32_bits(phys), reg + REG_RING_PHYS_LO_OFFSET);
+	iowrite32(upper_32_bits(phys), reg + REG_RING_PHYS_HI_OFFSET);
+	iowrite32((TBT_ICM_RING_NUM_TX_BUFS << REG_RING_SIZE_SHIFT) &
+			REG_RING_SIZE_MASK,
+		  reg + REG_RING_SIZE_OFFSET);
+
+	reg = iobase + REG_TX_OPTIONS_BASE + (TBT_ICM_RING_NUM*REG_OPTS_STEP);
+	iowrite32(REG_OPTS_RAW | REG_OPTS_VALID, reg);
+
+	/* configure RX for ICM ring */
+	reg = iobase + REG_RX_RING_BASE + (TBT_ICM_RING_NUM * REG_RING_STEP);
+	phys = nhi_ctxt->icm_ring_shared_mem_dma_addr +
+		offsetof(struct tbt_icm_ring_shared_memory, rx_buf_desc);
+	iowrite32(lower_32_bits(phys), reg + REG_RING_PHYS_LO_OFFSET);
+	iowrite32(upper_32_bits(phys), reg + REG_RING_PHYS_HI_OFFSET);
+	iowrite32(((TBT_ICM_RING_NUM_RX_BUFS << REG_RING_SIZE_SHIFT) &
+			REG_RING_SIZE_MASK) |
+		  ((TBT_ICM_RING_MAX_FRAME_SIZE << REG_RING_BUF_SIZE_SHIFT) &
+			REG_RING_BUF_SIZE_MASK),
+		  reg + REG_RING_SIZE_OFFSET);
+	iowrite32(((TBT_ICM_RING_NUM_RX_BUFS - 1) << REG_RING_CONS_SHIFT) &
+			REG_RING_CONS_MASK,
+		  reg + REG_RING_CONS_PROD_OFFSET);
+
+	reg = iobase + REG_RX_OPTIONS_BASE + (TBT_ICM_RING_NUM*REG_OPTS_STEP);
+	iowrite32(REG_OPTS_RAW | REG_OPTS_VALID, reg);
+
+	/* enable RX interrupt */
+	RING_INT_ENABLE_RX(iobase, TBT_ICM_RING_NUM, nhi_ctxt->num_paths);
+
+	if (likely((atomic_read(&subscribers) > 0) &&
+		   nhi_nvm_authenticated(nhi_ctxt))) {
+		down(&nhi_ctxt->send_sem);
+		nhi_ctxt->d0_exit = false;
+		mutex_lock(&nhi_ctxt->d0_exit_send_mutex);
+		/*
+		 * interrupts are enabled here before send due to
+		 * implicit barrier in mutex
+		 */
+		nhi_send_driver_ready_command(nhi_ctxt);
+		mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+	} else {
+		nhi_ctxt->d0_exit = false;
+	}
+
+	return 0;
+}
+
+static void icm_nhi_shutdown(struct pci_dev *pdev)
+{
+	nhi_suspend(&pdev->dev);
+}
+
+static void icm_nhi_remove(struct pci_dev *pdev)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(pdev);
+	int i;
+
+	nhi_suspend(&pdev->dev);
+
+	if (nhi_ctxt->net_workqueue)
+		destroy_workqueue(nhi_ctxt->net_workqueue);
+
+	/*
+	 * disable irq for msix or msi
+	 */
+	if (likely(nhi_ctxt->msix_entries)) {
+		/* Vector #0 isn't been used currently */
+		devm_free_irq(&pdev->dev, nhi_ctxt->msix_entries[1].vector,
+			      nhi_ctxt);
+		pci_disable_msix(pdev);
+	} else {
+		devm_free_irq(&pdev->dev, pdev->irq, nhi_ctxt);
+		pci_disable_msi(pdev);
+	}
+
+	/*
+	 * remove controller from the controllers list
+	 */
+	down_write(&controllers_list_rwsem);
+	list_del(&nhi_ctxt->node);
+	up_write(&controllers_list_rwsem);
+
+	nhi_mailbox(
+		nhi_ctxt,
+		((CC_DRV_UNLOADS_AND_DISCONNECT_INTER_DOMAIN_PATHS
+		  << REG_INMAIL_CMD_CMD_SHIFT) &
+		 REG_INMAIL_CMD_CMD_MASK) |
+		REG_INMAIL_CMD_REQUEST,
+		0, true);
+
+	usleep_range(1 * USEC_PER_MSEC, 5 * USEC_PER_MSEC);
+	iowrite32(1, nhi_ctxt->iobase + REG_HOST_INTERFACE_RST);
+
+	mutex_destroy(&nhi_ctxt->d0_exit_send_mutex);
+	mutex_destroy(&nhi_ctxt->d0_exit_mailbox_mutex);
+	mutex_destroy(&nhi_ctxt->mailbox_mutex);
+	for (i = 0; i < nhi_ctxt->num_ports; i++)
+		mutex_destroy(&(nhi_ctxt->net_devices[i].state_mutex));
+}
+
+static int icm_nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct tbt_nhi_ctxt *nhi_ctxt;
+	void __iomem *iobase;
+	int i, res;
+	bool enable_msi = false;
+
+	res = pcim_enable_device(pdev);
+	if (res) {
+		dev_err(&pdev->dev, "cannot enable PCI device, aborting\n");
+		return res;
+	}
+
+	res = pcim_iomap_regions(pdev, 1 << NHI_MMIO_BAR, pci_name(pdev));
+	if (res) {
+		dev_err(&pdev->dev, "cannot obtain PCI resources, aborting\n");
+		return res;
+	}
+
+	/* cannot fail - table is allocated in pcim_iomap_regions */
+	iobase = pcim_iomap_table(pdev)[NHI_MMIO_BAR];
+
+	/* check if ICM is running */
+	if (!(ioread32(iobase + REG_FW_STS) & REG_FW_STS_ICM_EN)) {
+		dev_err(&pdev->dev, "ICM isn't present, aborting\n");
+		return -ENODEV;
+	}
+
+	nhi_ctxt = devm_kzalloc(&pdev->dev, sizeof(*nhi_ctxt), GFP_KERNEL);
+	if (!nhi_ctxt)
+		return -ENOMEM;
+
+	nhi_ctxt->pdev = pdev;
+	nhi_ctxt->iobase = iobase;
+	nhi_ctxt->id = (PCI_DEVID(pdev->bus->number, pdev->devfn) << 16) |
+								id->device;
+	/*
+	 * Number of paths represents the number of rings available for
+	 * the controller.
+	 */
+	nhi_ctxt->num_paths = ioread32(iobase + REG_HOP_COUNT) &
+						REG_HOP_COUNT_TOTAL_PATHS_MASK;
+
+	nhi_ctxt->nvm_auth_on_boot = DEVICE_DATA_NVM_AUTH_ON_BOOT(
+							id->driver_data);
+	nhi_ctxt->support_full_e2e = DEVICE_DATA_SUPPORT_FULL_E2E(
+							id->driver_data);
+
+	nhi_ctxt->dma_port = DEVICE_DATA_DMA_PORT(id->driver_data);
+	/*
+	 * Number of ports in the controller
+	 */
+	nhi_ctxt->num_ports = DEVICE_DATA_NUM_PORTS(id->driver_data);
+	nhi_ctxt->nvm_ver_offset = DEVICE_DATA_NVM_VER_OFFSET(id->driver_data);
+
+	mutex_init(&nhi_ctxt->d0_exit_send_mutex);
+	mutex_init(&nhi_ctxt->d0_exit_mailbox_mutex);
+	mutex_init(&nhi_ctxt->mailbox_mutex);
+
+	sema_init(&nhi_ctxt->send_sem, 1);
+
+	INIT_WORK(&nhi_ctxt->icm_msgs_work, nhi_msgs_from_icm);
+
+	spin_lock_init(&nhi_ctxt->lock);
+
+	nhi_ctxt->net_devices = devm_kcalloc(&pdev->dev,
+					     nhi_ctxt->num_ports,
+					     sizeof(struct port_net_dev),
+					     GFP_KERNEL);
+	if (!nhi_ctxt->net_devices)
+		return -ENOMEM;
+
+	for (i = 0; i < nhi_ctxt->num_ports; i++)
+		mutex_init(&(nhi_ctxt->net_devices[i].state_mutex));
+
+	/*
+	 * allocating RX and TX vectors for ICM and per port
+	 * for thunderbolt networking.
+	 * The mapping of the vector is carried out by
+	 * nhi_set_int_vec and looks like:
+	 * 0=tx icm, 1=rx icm, 2=tx data port 0,
+	 * 3=rx data port 0...
+	 */
+	nhi_ctxt->num_vectors = (1 + nhi_ctxt->num_ports) * 2;
+	nhi_ctxt->msix_entries = devm_kcalloc(&pdev->dev,
+					      nhi_ctxt->num_vectors,
+					      sizeof(struct msix_entry),
+					      GFP_KERNEL);
+	if (likely(nhi_ctxt->msix_entries)) {
+		for (i = 0; i < nhi_ctxt->num_vectors; i++)
+			nhi_ctxt->msix_entries[i].entry = i;
+		res = pci_enable_msix_exact(pdev,
+					    nhi_ctxt->msix_entries,
+					    nhi_ctxt->num_vectors);
+
+		if (res ||
+		    /*
+		     * Allocating ICM RX only.
+		     * vector #0, which is TX complete to ICM,
+		     * isn't been used currently
+		     */
+		    devm_request_irq(&pdev->dev,
+				     nhi_ctxt->msix_entries[1].vector,
+				     nhi_icm_ring_rx_msix, 0, pci_name(pdev),
+				     nhi_ctxt)) {
+			devm_kfree(&pdev->dev, nhi_ctxt->msix_entries);
+			nhi_ctxt->msix_entries = NULL;
+			enable_msi = true;
+		}
+	} else {
+		enable_msi = true;
+	}
+	/*
+	 * In case allocation didn't succeed, use msi instead of msix
+	 */
+	if (enable_msi) {
+		res = pci_enable_msi(pdev);
+		if (res) {
+			dev_err(&pdev->dev, "cannot enable MSI, aborting\n");
+			return res;
+		}
+		res = devm_request_irq(&pdev->dev, pdev->irq, nhi_msi, 0,
+				       pci_name(pdev), nhi_ctxt);
+		if (res) {
+			dev_err(&pdev->dev,
+				"request_irq failed %d, aborting\n", res);
+			return res;
+		}
+	}
+	/*
+	 * try to work with address space of 64 bits.
+	 * In case this doesn't work, work with 32 bits.
+	 */
+	if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
+		nhi_ctxt->pci_using_dac = true;
+	} else {
+		res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+		if (res) {
+			dev_err(&pdev->dev,
+				"No suitable DMA available, aborting\n");
+			return res;
+		}
+	}
+
+	BUILD_BUG_ON(sizeof(struct tbt_buf_desc) != 16);
+	BUILD_BUG_ON(sizeof(struct tbt_icm_ring_shared_memory) > PAGE_SIZE);
+	nhi_ctxt->icm_ring_shared_mem = dmam_alloc_coherent(
+			&pdev->dev, sizeof(*nhi_ctxt->icm_ring_shared_mem),
+			&nhi_ctxt->icm_ring_shared_mem_dma_addr,
+			GFP_KERNEL | __GFP_ZERO);
+	if (nhi_ctxt->icm_ring_shared_mem == NULL) {
+		dev_err(&pdev->dev, "dmam_alloc_coherent failed, aborting\n");
+		return -ENOMEM;
+	}
+
+	nhi_ctxt->net_workqueue = create_singlethread_workqueue(DRV_NAME);
+	if (!nhi_ctxt->net_workqueue) {
+		dev_err(&pdev->dev, "create_singlethread_workqueue failed, aborting\n");
+		return -ENOMEM;
+	}
+
+	pci_set_master(pdev);
+	pci_set_drvdata(pdev, nhi_ctxt);
+
+	nhi_resume(&pdev->dev);
+	/*
+	 * Add the new controller at the end of the list
+	 */
+	down_write(&controllers_list_rwsem);
+	list_add_tail(&nhi_ctxt->node, &controllers_list);
+	up_write(&controllers_list_rwsem);
+
+	return res;
+}
+
+/*
+ * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
+ * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
+ * resume_noirq until we are done.
+ */
+static const struct dev_pm_ops icm_nhi_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(nhi_suspend, nhi_resume)
+};
+
+static const struct pci_device_id nhi_pci_device_ids[] = {
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_NHI),
+					DEVICE_DATA(1, 5, 0xa, false, false) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_NHI),
+					DEVICE_DATA(2, 5, 0xa, false, false) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI),
+					DEVICE_DATA(1, 5, 0xa, false, false) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI),
+					DEVICE_DATA(2, 5, 0xa, false, false) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI),
+					DEVICE_DATA(1, 3, 0xa, false, false) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI),
+					DEVICE_DATA(1, 5, 0xa, true, true) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI),
+					DEVICE_DATA(2, 5, 0xa, true, true) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI),
+					DEVICE_DATA(1, 3, 0xa, true, true) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI),
+					DEVICE_DATA(1, 5, 0xa, true, true) },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI),
+					DEVICE_DATA(2, 5, 0xa, true, true) },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, nhi_pci_device_ids);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static struct pci_driver icm_nhi_driver = {
+	.name = DRV_NAME,
+	.id_table = nhi_pci_device_ids,
+	.probe = icm_nhi_probe,
+	.remove = icm_nhi_remove,
+	.shutdown = icm_nhi_shutdown,
+	.driver.pm = &icm_nhi_pm_ops,
+};
+
+static int __init icm_nhi_init(void)
+{
+	int rc;
+
+	if (dmi_match(DMI_BOARD_VENDOR, "Apple Inc."))
+		return -ENODEV;
+
+	rc = genl_register_family_with_ops(&nhi_genl_family, nhi_ops);
+	if (rc)
+		goto failure;
+
+	rc = pci_register_driver(&icm_nhi_driver);
+	if (rc)
+		goto failure_genl;
+
+	return 0;
+
+failure_genl:
+	genl_unregister_family(&nhi_genl_family);
+
+failure:
+	pr_debug("nhi: error %d occurred in %s\n", rc, __func__);
+	return rc;
+}
+
+static void __exit icm_nhi_unload(void)
+{
+	genl_unregister_family(&nhi_genl_family);
+	pci_unregister_driver(&icm_nhi_driver);
+}
+
+module_init(icm_nhi_init);
+module_exit(icm_nhi_unload);
diff --git a/drivers/thunderbolt/icm/icm_nhi.h b/drivers/thunderbolt/icm/icm_nhi.h
new file mode 100644
index 0000000..7ad09f6
--- /dev/null
+++ b/drivers/thunderbolt/icm/icm_nhi.h
@@ -0,0 +1,93 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel 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, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * Intel Thunderbolt Mailing List <thunderbolt-software@...ts.01.org>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ ******************************************************************************/
+
+#ifndef ICM_NHI_H_
+#define ICM_NHI_H_
+
+#include <linux/pci.h>
+#include "../nhi_regs.h"
+
+#define DRV_VERSION "16.1.51.5"
+#define DRV_NAME "thunderbolt"
+
+#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI         0x157d /* Tbt 2 Low Pwr */
+#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE      0x157e
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI      0x15bf /* Tbt 3 Low Pwr */
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE   0x15c0
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI    0x15d2 /* Thunderbolt 3 */
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE 0x15d3
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI    0x15d9
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE 0x15da
+
+#define TBT_ICM_RING_MAX_FRAME_SIZE	256
+#define TBT_ICM_RING_NUM		0
+#define TBT_RING_MAX_FRM_DATA_SZ	(TBT_RING_MAX_FRAME_SIZE - \
+					 sizeof(struct tbt_frame_header))
+
+enum icm_operation_mode {
+	SAFE_MODE,
+	AUTHENTICATION_MODE_FUNCTIONALITY,
+	ENDPOINT_OPERATION_MODE,
+	FULL_FUNCTIONALITY,
+};
+
+#define TBT_ICM_RING_NUM_TX_BUFS TBT_RING_MIN_NUM_BUFFERS
+#define TBT_ICM_RING_NUM_RX_BUFS ((PAGE_SIZE - (TBT_ICM_RING_NUM_TX_BUFS * \
+	(sizeof(struct tbt_buf_desc) + TBT_ICM_RING_MAX_FRAME_SIZE))) / \
+	(sizeof(struct tbt_buf_desc) + TBT_ICM_RING_MAX_FRAME_SIZE))
+
+/* struct tbt_icm_ring_shared_memory - memory area for DMA */
+struct tbt_icm_ring_shared_memory {
+	u8 tx_buf[TBT_ICM_RING_NUM_TX_BUFS][TBT_ICM_RING_MAX_FRAME_SIZE];
+	u8 rx_buf[TBT_ICM_RING_NUM_RX_BUFS][TBT_ICM_RING_MAX_FRAME_SIZE];
+	struct tbt_buf_desc tx_buf_desc[TBT_ICM_RING_NUM_TX_BUFS];
+	struct tbt_buf_desc rx_buf_desc[TBT_ICM_RING_NUM_RX_BUFS];
+} __aligned(TBT_ICM_RING_MAX_FRAME_SIZE);
+
+/* mailbox data from SW */
+#define REG_INMAIL_DATA		0x39900
+
+/* mailbox command from SW */
+#define REG_INMAIL_CMD		0x39904
+#define REG_INMAIL_CMD_CMD_SHIFT	0
+#define REG_INMAIL_CMD_CMD_MASK		GENMASK(7, REG_INMAIL_CMD_CMD_SHIFT)
+#define REG_INMAIL_CMD_ERROR		BIT(30)
+#define REG_INMAIL_CMD_REQUEST		BIT(31)
+
+/* mailbox command from FW */
+#define REG_OUTMAIL_CMD		0x3990C
+#define REG_OUTMAIL_CMD_STS_SHIFT	0
+#define REG_OUTMAIL_CMD_STS_MASK	GENMASK(7, REG_OUTMAIL_CMD_STS_SHIFT)
+#define REG_OUTMAIL_CMD_OP_MODE_SHIFT	8
+#define REG_OUTMAIL_CMD_OP_MODE_MASK	\
+				GENMASK(11, REG_OUTMAIL_CMD_OP_MODE_SHIFT)
+#define REG_OUTMAIL_CMD_REQUEST		BIT(31)
+
+#define REG_FW_STS		0x39944
+#define REG_FW_STS_ICM_EN		GENMASK(1, 0)
+#define REG_FW_STS_NVM_AUTH_DONE	BIT(31)
+
+#endif
diff --git a/drivers/thunderbolt/icm/net.h b/drivers/thunderbolt/icm/net.h
new file mode 100644
index 0000000..55693ea
--- /dev/null
+++ b/drivers/thunderbolt/icm/net.h
@@ -0,0 +1,200 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel 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, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * Intel Thunderbolt Mailing List <thunderbolt-software@...ts.01.org>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ ******************************************************************************/
+
+#ifndef NET_H_
+#define NET_H_
+
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/mutex.h>
+#include <linux/semaphore.h>
+#include <net/genetlink.h>
+
+/*
+ * Each physical port contains 2 channels.
+ * Devices are exposed to user based on physical ports.
+ */
+#define CHANNELS_PER_PORT_NUM 2
+/*
+ * Calculate host physical port number (Zero-based numbering) from
+ * host channel/link which starts from 1.
+ */
+#define PORT_NUM_FROM_LINK(link) (((link) - 1) / CHANNELS_PER_PORT_NUM)
+
+#define TBT_TX_RING_FULL(prod, cons, size) ((((prod) + 1) % (size)) == (cons))
+#define TBT_TX_RING_EMPTY(prod, cons) ((prod) == (cons))
+#define TBT_RX_RING_FULL(prod, cons) ((prod) == (cons))
+#define TBT_RX_RING_EMPTY(prod, cons, size) ((((cons) + 1) % (size)) == (prod))
+
+#define PATH_FROM_PORT(num_paths, port_num) (((num_paths) - 1) - (port_num))
+
+/* PDF values for SW<->FW communication in raw mode */
+enum pdf_value {
+	PDF_READ_CONFIGURATION_REGISTERS = 1,
+	PDF_WRITE_CONFIGURATION_REGISTERS,
+	PDF_ERROR_NOTIFICATION,
+	PDF_ERROR_ACKNOWLEDGMENT,
+	PDF_PLUG_EVENT_NOTIFICATION,
+	PDF_INTER_DOMAIN_REQUEST,
+	PDF_INTER_DOMAIN_RESPONSE,
+	PDF_CM_OVERRIDE,
+	PDF_RESET_CIO_SWITCH,
+	PDF_FW_TO_SW_NOTIFICATION,
+	PDF_SW_TO_FW_COMMAND,
+	PDF_FW_TO_SW_RESPONSE
+};
+
+/*
+ * SW->FW commands
+ * CC = Command Code
+ */
+enum {
+	CC_GET_THUNDERBOLT_TOPOLOGY = 1,
+	CC_GET_VIDEO_RESOURCES_DATA,
+	CC_DRV_READY,
+	CC_APPROVE_PCI_CONNECTION,
+	CC_CHALLENGE_PCI_CONNECTION,
+	CC_ADD_DEVICE_AND_KEY,
+	CC_APPROVE_INTER_DOMAIN_CONNECTION = 0x10
+};
+
+/*
+ * SW -> FW mailbox commands
+ * CC = Command Code
+ */
+enum {
+	CC_STOP_CM_ACTIVITY,
+	CC_ENTER_PASS_THROUGH_MODE,
+	CC_ENTER_CM_OWNERSHIP_MODE,
+	CC_DRV_LOADED,
+	CC_DRV_UNLOADED,
+	CC_SAVE_CURRENT_CONNECTED_DEVICES,
+	CC_DISCONNECT_PCIE_PATHS,
+	CC_DRV_UNLOADS_AND_DISCONNECT_INTER_DOMAIN_PATHS,
+	DISCONNECT_PORT_A_INTER_DOMAIN_PATH = 0x10,
+	DISCONNECT_PORT_B_INTER_DOMAIN_PATH,
+	DP_TUNNEL_MODE_IN_ORDER_PER_CAPABILITIES = 0x1E,
+	DP_TUNNEL_MODE_MAXIMIZE_SNK_SRC_TUNNELS,
+	CC_SET_FW_MODE_FD1_D1_CERT = 0x20,
+	CC_SET_FW_MODE_FD1_D1_ALL,
+	CC_SET_FW_MODE_FD1_DA_CERT,
+	CC_SET_FW_MODE_FD1_DA_ALL,
+	CC_SET_FW_MODE_FDA_D1_CERT,
+	CC_SET_FW_MODE_FDA_D1_ALL,
+	CC_SET_FW_MODE_FDA_DA_CERT,
+	CC_SET_FW_MODE_FDA_DA_ALL
+};
+
+
+/* NHI genetlink attributes */
+enum {
+	NHI_ATTR_UNSPEC,
+	NHI_ATTR_DRV_VERSION,
+	NHI_ATTR_NVM_VER_OFFSET,
+	NHI_ATTR_NUM_PORTS,
+	NHI_ATTR_DMA_PORT,
+	NHI_ATTR_SUPPORT_FULL_E2E,
+	NHI_ATTR_MAILBOX_CMD,
+	NHI_ATTR_PDF,
+	NHI_ATTR_MSG_TO_ICM,
+	NHI_ATTR_MSG_FROM_ICM,
+	__NHI_ATTR_MAX,
+};
+#define NHI_ATTR_MAX (__NHI_ATTR_MAX - 1)
+
+struct port_net_dev {
+	struct net_device *net_dev;
+	struct mutex state_mutex;
+};
+
+/**
+ *  struct tbt_nhi_ctxt - thunderbolt native host interface context
+ *  @node:				node in the controllers list.
+ *  @pdev:				pci device information.
+ *  @iobase:				address of I/O.
+ *  @msix_entries:			MSI-X vectors.
+ *  @icm_ring_shared_mem:		virtual address of iCM ring.
+ *  @icm_ring_shared_mem_dma_addr:	DMA addr of iCM ring.
+ *  @send_sem:				semaphore for sending messages to iCM
+ *					one at a time.
+ *  @mailbox_mutex:			mutex for sending mailbox commands to
+ *					iCM one at a time.
+ *  @d0_exit_send_mutex:		synchronizing the d0 exit with messages.
+ *  @d0_exit_mailbox_mutex:		synchronizing the d0 exit with mailbox.
+ *  @lock:				synchronizing the interrupt registers
+ *					access.
+ *  @icm_msgs_work:			work queue for handling messages
+ *					from iCM.
+ *  @net_devices:			net devices per port.
+ *  @net_workqueue:			work queue to send net messages.
+ *  @id:				id of the controller.
+ *  @num_paths:				number of paths supported by controller.
+ *  @nvm_ver_offset:			offset of NVM version in NVM.
+ *  @num_vectors:			number of MSI-X vectors.
+ *  @num_ports:				number of ports in the controller.
+ *  @dma_port:				DMA port.
+ *  @d0_exit:				whether controller exit D0 state.
+ *  @nvm_auth_on_boot:			whether iCM authenticates the NVM
+ *					during boot.
+ *  @wait_for_icm_resp:			whether to wait for iCM response.
+ *  @ignore_icm_resp:			whether to ignore iCM response.
+ *  @pci_using_dac:			whether using DAC.
+ *  @support_full_e2e:			whether controller support full E2E.
+ */
+struct tbt_nhi_ctxt {
+	struct list_head node;
+	struct pci_dev *pdev;
+	void __iomem *iobase;
+	struct msix_entry *msix_entries;
+	struct tbt_icm_ring_shared_memory *icm_ring_shared_mem;
+	dma_addr_t icm_ring_shared_mem_dma_addr;
+	struct semaphore send_sem;
+	struct mutex mailbox_mutex;
+	struct mutex d0_exit_send_mutex;
+	struct mutex d0_exit_mailbox_mutex;
+	spinlock_t lock;
+	struct work_struct icm_msgs_work;
+	struct port_net_dev *net_devices;
+	struct workqueue_struct *net_workqueue;
+	u32 id;
+	u32 num_paths;
+	u16 nvm_ver_offset;
+	u8 num_vectors;
+	u8 num_ports;
+	u8 dma_port;
+	bool d0_exit;
+	bool nvm_auth_on_boot : 1;
+	bool wait_for_icm_resp : 1;
+	bool ignore_icm_resp : 1;
+	bool pci_using_dac : 1;
+	bool support_full_e2e : 1;
+};
+
+int nhi_send_message(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
+		      u32 msg_len, const u8 *msg, bool ignore_icm_resp);
+int nhi_mailbox(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd, u32 data, bool deinit);
+
+#endif
-- 
2.7.4

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