These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

6 files changed, 2649 insertions, 0 deletions

diff --git a/kernel/drivers/ntb/hw/Kconfig b/kernel/drivers/ntb/hw/Kconfig
new file mode 100644
index 000000000..4d5535c4c
--- /dev/null
+++ b/kernel/drivers/ntb/hw/Kconfig
@@ -0,0 +1 @@
+source "drivers/ntb/hw/intel/Kconfig"
diff --git a/kernel/drivers/ntb/hw/Makefile b/kernel/drivers/ntb/hw/Makefile
new file mode 100644
index 000000000..175d7c92a
--- /dev/null
+++ b/kernel/drivers/ntb/hw/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_NTB_INTEL)	+= intel/
diff --git a/kernel/drivers/ntb/hw/intel/Kconfig b/kernel/drivers/ntb/hw/intel/Kconfig
new file mode 100644
index 000000000..91f995e33
--- /dev/null
+++ b/kernel/drivers/ntb/hw/intel/Kconfig
@@ -0,0 +1,7 @@
+config NTB_INTEL
+	tristate "Intel Non-Transparent Bridge support"
+	depends on X86_64
+	help
+	 This driver supports Intel NTB on capable Xeon and Atom hardware.
+
+	 If unsure, say N.
diff --git a/kernel/drivers/ntb/hw/intel/Makefile b/kernel/drivers/ntb/hw/intel/Makefile
new file mode 100644
index 000000000..1b434568d
--- /dev/null
+++ b/kernel/drivers/ntb/hw/intel/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_NTB_INTEL) += ntb_hw_intel.o
diff --git a/kernel/drivers/ntb/hw/intel/ntb_hw_intel.c b/kernel/drivers/ntb/hw/intel/ntb_hw_intel.c
new file mode 100644
index 000000000..a198f8298
--- /dev/null
+++ b/kernel/drivers/ntb/hw/intel/ntb_hw_intel.c
@@ -0,0 +1,2299 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ *   redistributing this file, you may do so under either license.
+ *
+ *   GPL LICENSE SUMMARY
+ *
+ *   Copyright(c) 2012 Intel Corporation. All rights reserved.
+ *   Copyright (C) 2015 EMC Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of version 2 of the GNU General Public License as
+ *   published by the Free Software Foundation.
+ *
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2012 Intel Corporation. All rights reserved.
+ *   Copyright (C) 2015 EMC Corporation. All Rights Reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copy
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Intel PCIe NTB Linux driver
+ *
+ * Contact Information:
+ * Jon Mason <jon.mason@intel.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/ntb.h>
+
+#include "ntb_hw_intel.h"
+
+#define NTB_NAME	"ntb_hw_intel"
+#define NTB_DESC	"Intel(R) PCI-E Non-Transparent Bridge Driver"
+#define NTB_VER		"2.0"
+
+MODULE_DESCRIPTION(NTB_DESC);
+MODULE_VERSION(NTB_VER);
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Intel Corporation");
+
+#define bar0_off(base, bar) ((base) + ((bar) << 2))
+#define bar2_off(base, bar) bar0_off(base, (bar) - 2)
+
+static const struct intel_ntb_reg atom_reg;
+static const struct intel_ntb_alt_reg atom_pri_reg;
+static const struct intel_ntb_alt_reg atom_sec_reg;
+static const struct intel_ntb_alt_reg atom_b2b_reg;
+static const struct intel_ntb_xlat_reg atom_pri_xlat;
+static const struct intel_ntb_xlat_reg atom_sec_xlat;
+static const struct intel_ntb_reg xeon_reg;
+static const struct intel_ntb_alt_reg xeon_pri_reg;
+static const struct intel_ntb_alt_reg xeon_sec_reg;
+static const struct intel_ntb_alt_reg xeon_b2b_reg;
+static const struct intel_ntb_xlat_reg xeon_pri_xlat;
+static const struct intel_ntb_xlat_reg xeon_sec_xlat;
+static struct intel_b2b_addr xeon_b2b_usd_addr;
+static struct intel_b2b_addr xeon_b2b_dsd_addr;
+static const struct ntb_dev_ops intel_ntb_ops;
+
+static const struct file_operations intel_ntb_debugfs_info;
+static struct dentry *debugfs_dir;
+
+static int b2b_mw_idx = -1;
+module_param(b2b_mw_idx, int, 0644);
+MODULE_PARM_DESC(b2b_mw_idx, "Use this mw idx to access the peer ntb.  A "
+		 "value of zero or positive starts from first mw idx, and a "
+		 "negative value starts from last mw idx.  Both sides MUST "
+		 "set the same value here!");
+
+static unsigned int b2b_mw_share;
+module_param(b2b_mw_share, uint, 0644);
+MODULE_PARM_DESC(b2b_mw_share, "If the b2b mw is large enough, configure the "
+		 "ntb so that the peer ntb only occupies the first half of "
+		 "the mw, so the second half can still be used as a mw.  Both "
+		 "sides MUST set the same value here!");
+
+module_param_named(xeon_b2b_usd_bar2_addr64,
+		   xeon_b2b_usd_addr.bar2_addr64, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64,
+		 "XEON B2B USD BAR 2 64-bit address");
+
+module_param_named(xeon_b2b_usd_bar4_addr64,
+		   xeon_b2b_usd_addr.bar4_addr64, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64,
+		 "XEON B2B USD BAR 4 64-bit address");
+
+module_param_named(xeon_b2b_usd_bar4_addr32,
+		   xeon_b2b_usd_addr.bar4_addr32, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64,
+		 "XEON B2B USD split-BAR 4 32-bit address");
+
+module_param_named(xeon_b2b_usd_bar5_addr32,
+		   xeon_b2b_usd_addr.bar5_addr32, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64,
+		 "XEON B2B USD split-BAR 5 32-bit address");
+
+module_param_named(xeon_b2b_dsd_bar2_addr64,
+		   xeon_b2b_dsd_addr.bar2_addr64, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64,
+		 "XEON B2B DSD BAR 2 64-bit address");
+
+module_param_named(xeon_b2b_dsd_bar4_addr64,
+		   xeon_b2b_dsd_addr.bar4_addr64, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64,
+		 "XEON B2B DSD BAR 4 64-bit address");
+
+module_param_named(xeon_b2b_dsd_bar4_addr32,
+		   xeon_b2b_dsd_addr.bar4_addr32, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64,
+		 "XEON B2B DSD split-BAR 4 32-bit address");
+
+module_param_named(xeon_b2b_dsd_bar5_addr32,
+		   xeon_b2b_dsd_addr.bar5_addr32, ullong, 0644);
+MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64,
+		 "XEON B2B DSD split-BAR 5 32-bit address");
+
+#ifndef ioread64
+#ifdef readq
+#define ioread64 readq
+#else
+#define ioread64 _ioread64
+static inline u64 _ioread64(void __iomem *mmio)
+{
+	u64 low, high;
+
+	low = ioread32(mmio);
+	high = ioread32(mmio + sizeof(u32));
+	return low | (high << 32);
+}
+#endif
+#endif
+
+#ifndef iowrite64
+#ifdef writeq
+#define iowrite64 writeq
+#else
+#define iowrite64 _iowrite64
+static inline void _iowrite64(u64 val, void __iomem *mmio)
+{
+	iowrite32(val, mmio);
+	iowrite32(val >> 32, mmio + sizeof(u32));
+}
+#endif
+#endif
+
+static inline int pdev_is_atom(struct pci_dev *pdev)
+{
+	switch (pdev->device) {
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_BWD:
+		return 1;
+	}
+	return 0;
+}
+
+static inline int pdev_is_xeon(struct pci_dev *pdev)
+{
+	switch (pdev->device) {
+	case PCI_DEVICE_ID_INTEL_NTB_SS_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
+		return 1;
+	}
+	return 0;
+}
+
+static inline void ndev_reset_unsafe_flags(struct intel_ntb_dev *ndev)
+{
+	ndev->unsafe_flags = 0;
+	ndev->unsafe_flags_ignore = 0;
+
+	/* Only B2B has a workaround to avoid SDOORBELL */
+	if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP)
+		if (!ntb_topo_is_b2b(ndev->ntb.topo))
+			ndev->unsafe_flags |= NTB_UNSAFE_DB;
+
+	/* No low level workaround to avoid SB01BASE */
+	if (ndev->hwerr_flags & NTB_HWERR_SB01BASE_LOCKUP) {
+		ndev->unsafe_flags |= NTB_UNSAFE_DB;
+		ndev->unsafe_flags |= NTB_UNSAFE_SPAD;
+	}
+}
+
+static inline int ndev_is_unsafe(struct intel_ntb_dev *ndev,
+				 unsigned long flag)
+{
+	return !!(flag & ndev->unsafe_flags & ~ndev->unsafe_flags_ignore);
+}
+
+static inline int ndev_ignore_unsafe(struct intel_ntb_dev *ndev,
+				     unsigned long flag)
+{
+	flag &= ndev->unsafe_flags;
+	ndev->unsafe_flags_ignore |= flag;
+
+	return !!flag;
+}
+
+static int ndev_mw_to_bar(struct intel_ntb_dev *ndev, int idx)
+{
+	if (idx < 0 || idx >= ndev->mw_count)
+		return -EINVAL;
+	return ndev->reg->mw_bar[idx];
+}
+
+static inline int ndev_db_addr(struct intel_ntb_dev *ndev,
+			       phys_addr_t *db_addr, resource_size_t *db_size,
+			       phys_addr_t reg_addr, unsigned long reg)
+{
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB))
+		pr_warn_once("%s: NTB unsafe doorbell access", __func__);
+
+	if (db_addr) {
+		*db_addr = reg_addr + reg;
+		dev_dbg(ndev_dev(ndev), "Peer db addr %llx\n", *db_addr);
+	}
+
+	if (db_size) {
+		*db_size = ndev->reg->db_size;
+		dev_dbg(ndev_dev(ndev), "Peer db size %llx\n", *db_size);
+	}
+
+	return 0;
+}
+
+static inline u64 ndev_db_read(struct intel_ntb_dev *ndev,
+			       void __iomem *mmio)
+{
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB))
+		pr_warn_once("%s: NTB unsafe doorbell access", __func__);
+
+	return ndev->reg->db_ioread(mmio);
+}
+
+static inline int ndev_db_write(struct intel_ntb_dev *ndev, u64 db_bits,
+				void __iomem *mmio)
+{
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB))
+		pr_warn_once("%s: NTB unsafe doorbell access", __func__);
+
+	if (db_bits & ~ndev->db_valid_mask)
+		return -EINVAL;
+
+	ndev->reg->db_iowrite(db_bits, mmio);
+
+	return 0;
+}
+
+static inline int ndev_db_set_mask(struct intel_ntb_dev *ndev, u64 db_bits,
+				   void __iomem *mmio)
+{
+	unsigned long irqflags;
+
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB))
+		pr_warn_once("%s: NTB unsafe doorbell access", __func__);
+
+	if (db_bits & ~ndev->db_valid_mask)
+		return -EINVAL;
+
+	spin_lock_irqsave(&ndev->db_mask_lock, irqflags);
+	{
+		ndev->db_mask |= db_bits;
+		ndev->reg->db_iowrite(ndev->db_mask, mmio);
+	}
+	spin_unlock_irqrestore(&ndev->db_mask_lock, irqflags);
+
+	return 0;
+}
+
+static inline int ndev_db_clear_mask(struct intel_ntb_dev *ndev, u64 db_bits,
+				     void __iomem *mmio)
+{
+	unsigned long irqflags;
+
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB))
+		pr_warn_once("%s: NTB unsafe doorbell access", __func__);
+
+	if (db_bits & ~ndev->db_valid_mask)
+		return -EINVAL;
+
+	spin_lock_irqsave(&ndev->db_mask_lock, irqflags);
+	{
+		ndev->db_mask &= ~db_bits;
+		ndev->reg->db_iowrite(ndev->db_mask, mmio);
+	}
+	spin_unlock_irqrestore(&ndev->db_mask_lock, irqflags);
+
+	return 0;
+}
+
+static inline int ndev_vec_mask(struct intel_ntb_dev *ndev, int db_vector)
+{
+	u64 shift, mask;
+
+	shift = ndev->db_vec_shift;
+	mask = BIT_ULL(shift) - 1;
+
+	return mask << (shift * db_vector);
+}
+
+static inline int ndev_spad_addr(struct intel_ntb_dev *ndev, int idx,
+				 phys_addr_t *spad_addr, phys_addr_t reg_addr,
+				 unsigned long reg)
+{
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_SPAD))
+		pr_warn_once("%s: NTB unsafe scratchpad access", __func__);
+
+	if (idx < 0 || idx >= ndev->spad_count)
+		return -EINVAL;
+
+	if (spad_addr) {
+		*spad_addr = reg_addr + reg + (idx << 2);
+		dev_dbg(ndev_dev(ndev), "Peer spad addr %llx\n", *spad_addr);
+	}
+
+	return 0;
+}
+
+static inline u32 ndev_spad_read(struct intel_ntb_dev *ndev, int idx,
+				 void __iomem *mmio)
+{
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_SPAD))
+		pr_warn_once("%s: NTB unsafe scratchpad access", __func__);
+
+	if (idx < 0 || idx >= ndev->spad_count)
+		return 0;
+
+	return ioread32(mmio + (idx << 2));
+}
+
+static inline int ndev_spad_write(struct intel_ntb_dev *ndev, int idx, u32 val,
+				  void __iomem *mmio)
+{
+	if (ndev_is_unsafe(ndev, NTB_UNSAFE_SPAD))
+		pr_warn_once("%s: NTB unsafe scratchpad access", __func__);
+
+	if (idx < 0 || idx >= ndev->spad_count)
+		return -EINVAL;
+
+	iowrite32(val, mmio + (idx << 2));
+
+	return 0;
+}
+
+static irqreturn_t ndev_interrupt(struct intel_ntb_dev *ndev, int vec)
+{
+	u64 vec_mask;
+
+	vec_mask = ndev_vec_mask(ndev, vec);
+
+	dev_dbg(ndev_dev(ndev), "vec %d vec_mask %llx\n", vec, vec_mask);
+
+	ndev->last_ts = jiffies;
+
+	if (vec_mask & ndev->db_link_mask) {
+		if (ndev->reg->poll_link(ndev))
+			ntb_link_event(&ndev->ntb);
+	}
+
+	if (vec_mask & ndev->db_valid_mask)
+		ntb_db_event(&ndev->ntb, vec);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ndev_vec_isr(int irq, void *dev)
+{
+	struct intel_ntb_vec *nvec = dev;
+
+	return ndev_interrupt(nvec->ndev, nvec->num);
+}
+
+static irqreturn_t ndev_irq_isr(int irq, void *dev)
+{
+	struct intel_ntb_dev *ndev = dev;
+
+	return ndev_interrupt(ndev, irq - ndev_pdev(ndev)->irq);
+}
+
+static int ndev_init_isr(struct intel_ntb_dev *ndev,
+			 int msix_min, int msix_max,
+			 int msix_shift, int total_shift)
+{
+	struct pci_dev *pdev;
+	int rc, i, msix_count, node;
+
+	pdev = ndev_pdev(ndev);
+
+	node = dev_to_node(&pdev->dev);
+
+	/* Mask all doorbell interrupts */
+	ndev->db_mask = ndev->db_valid_mask;
+	ndev->reg->db_iowrite(ndev->db_mask,
+			      ndev->self_mmio +
+			      ndev->self_reg->db_mask);
+
+	/* Try to set up msix irq */
+
+	ndev->vec = kzalloc_node(msix_max * sizeof(*ndev->vec),
+				 GFP_KERNEL, node);
+	if (!ndev->vec)
+		goto err_msix_vec_alloc;
+
+	ndev->msix = kzalloc_node(msix_max * sizeof(*ndev->msix),
+				  GFP_KERNEL, node);
+	if (!ndev->msix)
+		goto err_msix_alloc;
+
+	for (i = 0; i < msix_max; ++i)
+		ndev->msix[i].entry = i;
+
+	msix_count = pci_enable_msix_range(pdev, ndev->msix,
+					   msix_min, msix_max);
+	if (msix_count < 0)
+		goto err_msix_enable;
+
+	for (i = 0; i < msix_count; ++i) {
+		ndev->vec[i].ndev = ndev;
+		ndev->vec[i].num = i;
+		rc = request_irq(ndev->msix[i].vector, ndev_vec_isr, 0,
+				 "ndev_vec_isr", &ndev->vec[i]);
+		if (rc)
+			goto err_msix_request;
+	}
+
+	dev_dbg(ndev_dev(ndev), "Using msix interrupts\n");
+	ndev->db_vec_count = msix_count;
+	ndev->db_vec_shift = msix_shift;
+	return 0;
+
+err_msix_request:
+	while (i-- > 0)
+		free_irq(ndev->msix[i].vector, ndev);
+	pci_disable_msix(pdev);
+err_msix_enable:
+	kfree(ndev->msix);
+err_msix_alloc:
+	kfree(ndev->vec);
+err_msix_vec_alloc:
+	ndev->msix = NULL;
+	ndev->vec = NULL;
+
+	/* Try to set up msi irq */
+
+	rc = pci_enable_msi(pdev);
+	if (rc)
+		goto err_msi_enable;
+
+	rc = request_irq(pdev->irq, ndev_irq_isr, 0,
+			 "ndev_irq_isr", ndev);
+	if (rc)
+		goto err_msi_request;
+
+	dev_dbg(ndev_dev(ndev), "Using msi interrupts\n");
+	ndev->db_vec_count = 1;
+	ndev->db_vec_shift = total_shift;
+	return 0;
+
+err_msi_request:
+	pci_disable_msi(pdev);
+err_msi_enable:
+
+	/* Try to set up intx irq */
+
+	pci_intx(pdev, 1);
+
+	rc = request_irq(pdev->irq, ndev_irq_isr, IRQF_SHARED,
+			 "ndev_irq_isr", ndev);
+	if (rc)
+		goto err_intx_request;
+
+	dev_dbg(ndev_dev(ndev), "Using intx interrupts\n");
+	ndev->db_vec_count = 1;
+	ndev->db_vec_shift = total_shift;
+	return 0;
+
+err_intx_request:
+	return rc;
+}
+
+static void ndev_deinit_isr(struct intel_ntb_dev *ndev)
+{
+	struct pci_dev *pdev;
+	int i;
+
+	pdev = ndev_pdev(ndev);
+
+	/* Mask all doorbell interrupts */
+	ndev->db_mask = ndev->db_valid_mask;
+	ndev->reg->db_iowrite(ndev->db_mask,
+			      ndev->self_mmio +
+			      ndev->self_reg->db_mask);
+
+	if (ndev->msix) {
+		i = ndev->db_vec_count;
+		while (i--)
+			free_irq(ndev->msix[i].vector, &ndev->vec[i]);
+		pci_disable_msix(pdev);
+		kfree(ndev->msix);
+		kfree(ndev->vec);
+	} else {
+		free_irq(pdev->irq, ndev);
+		if (pci_dev_msi_enabled(pdev))
+			pci_disable_msi(pdev);
+	}
+}
+
+static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
+				 size_t count, loff_t *offp)
+{
+	struct intel_ntb_dev *ndev;
+	void __iomem *mmio;
+	char *buf;
+	size_t buf_size;
+	ssize_t ret, off;
+	union { u64 v64; u32 v32; u16 v16; } u;
+
+	ndev = filp->private_data;
+	mmio = ndev->self_mmio;
+
+	buf_size = min(count, 0x800ul);
+
+	buf = kmalloc(buf_size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	off = 0;
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "NTB Device Information:\n");
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "Connection Topology -\t%s\n",
+			 ntb_topo_string(ndev->ntb.topo));
+
+	if (ndev->b2b_idx != UINT_MAX) {
+		off += scnprintf(buf + off, buf_size - off,
+				 "B2B MW Idx -\t\t%u\n", ndev->b2b_idx);
+		off += scnprintf(buf + off, buf_size - off,
+				 "B2B Offset -\t\t%#lx\n", ndev->b2b_off);
+	}
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "BAR4 Split -\t\t%s\n",
+			 ndev->bar4_split ? "yes" : "no");
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "NTB CTL -\t\t%#06x\n", ndev->ntb_ctl);
+	off += scnprintf(buf + off, buf_size - off,
+			 "LNK STA -\t\t%#06x\n", ndev->lnk_sta);
+
+	if (!ndev->reg->link_is_up(ndev)) {
+		off += scnprintf(buf + off, buf_size - off,
+				 "Link Status -\t\tDown\n");
+	} else {
+		off += scnprintf(buf + off, buf_size - off,
+				 "Link Status -\t\tUp\n");
+		off += scnprintf(buf + off, buf_size - off,
+				 "Link Speed -\t\tPCI-E Gen %u\n",
+				 NTB_LNK_STA_SPEED(ndev->lnk_sta));
+		off += scnprintf(buf + off, buf_size - off,
+				 "Link Width -\t\tx%u\n",
+				 NTB_LNK_STA_WIDTH(ndev->lnk_sta));
+	}
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "Memory Window Count -\t%u\n", ndev->mw_count);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Scratchpad Count -\t%u\n", ndev->spad_count);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Count -\t%u\n", ndev->db_count);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Vector Count -\t%u\n", ndev->db_vec_count);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Vector Shift -\t%u\n", ndev->db_vec_shift);
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Valid Mask -\t%#llx\n", ndev->db_valid_mask);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Link Mask -\t%#llx\n", ndev->db_link_mask);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Mask Cached -\t%#llx\n", ndev->db_mask);
+
+	u.v64 = ndev_db_read(ndev, mmio + ndev->self_reg->db_mask);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Mask -\t\t%#llx\n", u.v64);
+
+	u.v64 = ndev_db_read(ndev, mmio + ndev->self_reg->db_bell);
+	off += scnprintf(buf + off, buf_size - off,
+			 "Doorbell Bell -\t\t%#llx\n", u.v64);
+
+	off += scnprintf(buf + off, buf_size - off,
+			 "\nNTB Incoming XLAT:\n");
+
+	u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 2));
+	off += scnprintf(buf + off, buf_size - off,
+			 "XLAT23 -\t\t%#018llx\n", u.v64);
+
+	if (ndev->bar4_split) {
+		u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 4));
+		off += scnprintf(buf + off, buf_size - off,
+				 "XLAT4 -\t\t\t%#06x\n", u.v32);
+
+		u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 5));
+		off += scnprintf(buf + off, buf_size - off,
+				 "XLAT5 -\t\t\t%#06x\n", u.v32);
+	} else {
+		u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 4));
+		off += scnprintf(buf + off, buf_size - off,
+				 "XLAT45 -\t\t%#018llx\n", u.v64);
+	}
+
+	u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 2));
+	off += scnprintf(buf + off, buf_size - off,
+			 "LMT23 -\t\t\t%#018llx\n", u.v64);
+
+	if (ndev->bar4_split) {
+		u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 4));
+		off += scnprintf(buf + off, buf_size - off,
+				 "LMT4 -\t\t\t%#06x\n", u.v32);
+		u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 5));
+		off += scnprintf(buf + off, buf_size - off,
+				 "LMT5 -\t\t\t%#06x\n", u.v32);
+	} else {
+		u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 4));
+		off += scnprintf(buf + off, buf_size - off,
+				 "LMT45 -\t\t\t%#018llx\n", u.v64);
+	}
+
+	if (pdev_is_xeon(ndev->ntb.pdev)) {
+		if (ntb_topo_is_b2b(ndev->ntb.topo)) {
+			off += scnprintf(buf + off, buf_size - off,
+					 "\nNTB Outgoing B2B XLAT:\n");
+
+			u.v64 = ioread64(mmio + XEON_PBAR23XLAT_OFFSET);
+			off += scnprintf(buf + off, buf_size - off,
+					 "B2B XLAT23 -\t\t%#018llx\n", u.v64);
+
+			if (ndev->bar4_split) {
+				u.v32 = ioread32(mmio + XEON_PBAR4XLAT_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "B2B XLAT4 -\t\t%#06x\n",
+						 u.v32);
+				u.v32 = ioread32(mmio + XEON_PBAR5XLAT_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "B2B XLAT5 -\t\t%#06x\n",
+						 u.v32);
+			} else {
+				u.v64 = ioread64(mmio + XEON_PBAR45XLAT_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "B2B XLAT45 -\t\t%#018llx\n",
+						 u.v64);
+			}
+
+			u.v64 = ioread64(mmio + XEON_PBAR23LMT_OFFSET);
+			off += scnprintf(buf + off, buf_size - off,
+					 "B2B LMT23 -\t\t%#018llx\n", u.v64);
+
+			if (ndev->bar4_split) {
+				u.v32 = ioread32(mmio + XEON_PBAR4LMT_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "B2B LMT4 -\t\t%#06x\n",
+						 u.v32);
+				u.v32 = ioread32(mmio + XEON_PBAR5LMT_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "B2B LMT5 -\t\t%#06x\n",
+						 u.v32);
+			} else {
+				u.v64 = ioread64(mmio + XEON_PBAR45LMT_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "B2B LMT45 -\t\t%#018llx\n",
+						 u.v64);
+			}
+
+			off += scnprintf(buf + off, buf_size - off,
+					 "\nNTB Secondary BAR:\n");
+
+			u.v64 = ioread64(mmio + XEON_SBAR0BASE_OFFSET);
+			off += scnprintf(buf + off, buf_size - off,
+					 "SBAR01 -\t\t%#018llx\n", u.v64);
+
+			u.v64 = ioread64(mmio + XEON_SBAR23BASE_OFFSET);
+			off += scnprintf(buf + off, buf_size - off,
+					 "SBAR23 -\t\t%#018llx\n", u.v64);
+
+			if (ndev->bar4_split) {
+				u.v32 = ioread32(mmio + XEON_SBAR4BASE_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "SBAR4 -\t\t\t%#06x\n", u.v32);
+				u.v32 = ioread32(mmio + XEON_SBAR5BASE_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "SBAR5 -\t\t\t%#06x\n", u.v32);
+			} else {
+				u.v64 = ioread64(mmio + XEON_SBAR45BASE_OFFSET);
+				off += scnprintf(buf + off, buf_size - off,
+						 "SBAR45 -\t\t%#018llx\n",
+						 u.v64);
+			}
+		}
+
+		off += scnprintf(buf + off, buf_size - off,
+				 "\nXEON NTB Statistics:\n");
+
+		u.v16 = ioread16(mmio + XEON_USMEMMISS_OFFSET);
+		off += scnprintf(buf + off, buf_size - off,
+				 "Upstream Memory Miss -\t%u\n", u.v16);
+
+		off += scnprintf(buf + off, buf_size - off,
+				 "\nXEON NTB Hardware Errors:\n");
+
+		if (!pci_read_config_word(ndev->ntb.pdev,
+					  XEON_DEVSTS_OFFSET, &u.v16))
+			off += scnprintf(buf + off, buf_size - off,
+					 "DEVSTS -\t\t%#06x\n", u.v16);
+
+		if (!pci_read_config_word(ndev->ntb.pdev,
+					  XEON_LINK_STATUS_OFFSET, &u.v16))
+			off += scnprintf(buf + off, buf_size - off,
+					 "LNKSTS -\t\t%#06x\n", u.v16);
+
+		if (!pci_read_config_dword(ndev->ntb.pdev,
+					   XEON_UNCERRSTS_OFFSET, &u.v32))
+			off += scnprintf(buf + off, buf_size - off,
+					 "UNCERRSTS -\t\t%#06x\n", u.v32);
+
+		if (!pci_read_config_dword(ndev->ntb.pdev,
+					   XEON_CORERRSTS_OFFSET, &u.v32))
+			off += scnprintf(buf + off, buf_size - off,
+					 "CORERRSTS -\t\t%#06x\n", u.v32);
+	}
+
+	ret = simple_read_from_buffer(ubuf, count, offp, buf, off);
+	kfree(buf);
+	return ret;
+}
+
+static void ndev_init_debugfs(struct intel_ntb_dev *ndev)
+{
+	if (!debugfs_dir) {
+		ndev->debugfs_dir = NULL;
+		ndev->debugfs_info = NULL;
+	} else {
+		ndev->debugfs_dir =
+			debugfs_create_dir(ndev_name(ndev), debugfs_dir);
+		if (!ndev->debugfs_dir)
+			ndev->debugfs_info = NULL;
+		else
+			ndev->debugfs_info =
+				debugfs_create_file("info", S_IRUSR,
+						    ndev->debugfs_dir, ndev,
+						    &intel_ntb_debugfs_info);
+	}
+}
+
+static void ndev_deinit_debugfs(struct intel_ntb_dev *ndev)
+{
+	debugfs_remove_recursive(ndev->debugfs_dir);
+}
+
+static int intel_ntb_mw_count(struct ntb_dev *ntb)
+{
+	return ntb_ndev(ntb)->mw_count;
+}
+
+static int intel_ntb_mw_get_range(struct ntb_dev *ntb, int idx,
+				  phys_addr_t *base,
+				  resource_size_t *size,
+				  resource_size_t *align,
+				  resource_size_t *align_size)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+	int bar;
+
+	if (idx >= ndev->b2b_idx && !ndev->b2b_off)
+		idx += 1;
+
+	bar = ndev_mw_to_bar(ndev, idx);
+	if (bar < 0)
+		return bar;
+
+	if (base)
+		*base = pci_resource_start(ndev->ntb.pdev, bar) +
+			(idx == ndev->b2b_idx ? ndev->b2b_off : 0);
+
+	if (size)
+		*size = pci_resource_len(ndev->ntb.pdev, bar) -
+			(idx == ndev->b2b_idx ? ndev->b2b_off : 0);
+
+	if (align)
+		*align = pci_resource_len(ndev->ntb.pdev, bar);
+
+	if (align_size)
+		*align_size = 1;
+
+	return 0;
+}
+
+static int intel_ntb_mw_set_trans(struct ntb_dev *ntb, int idx,
+				  dma_addr_t addr, resource_size_t size)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+	unsigned long base_reg, xlat_reg, limit_reg;
+	resource_size_t bar_size, mw_size;
+	void __iomem *mmio;
+	u64 base, limit, reg_val;
+	int bar;
+
+	if (idx >= ndev->b2b_idx && !ndev->b2b_off)
+		idx += 1;
+
+	bar = ndev_mw_to_bar(ndev, idx);
+	if (bar < 0)
+		return bar;
+
+	bar_size = pci_resource_len(ndev->ntb.pdev, bar);
+
+	if (idx == ndev->b2b_idx)
+		mw_size = bar_size - ndev->b2b_off;
+	else
+		mw_size = bar_size;
+
+	/* hardware requires that addr is aligned to bar size */
+	if (addr & (bar_size - 1))
+		return -EINVAL;
+
+	/* make sure the range fits in the usable mw size */
+	if (size > mw_size)
+		return -EINVAL;
+
+	mmio = ndev->self_mmio;
+	base_reg = bar0_off(ndev->xlat_reg->bar0_base, bar);
+	xlat_reg = bar2_off(ndev->xlat_reg->bar2_xlat, bar);
+	limit_reg = bar2_off(ndev->xlat_reg->bar2_limit, bar);
+
+	if (bar < 4 || !ndev->bar4_split) {
+		base = ioread64(mmio + base_reg);
+
+		/* Set the limit if supported, if size is not mw_size */
+		if (limit_reg && size != mw_size)
+			limit = base + size;
+		else
+			limit = 0;
+
+		/* set and verify setting the translation address */
+		iowrite64(addr, mmio + xlat_reg);
+		reg_val = ioread64(mmio + xlat_reg);
+		if (reg_val != addr) {
+			iowrite64(0, mmio + xlat_reg);
+			return -EIO;
+		}
+
+		/* set and verify setting the limit */
+		iowrite64(limit, mmio + limit_reg);
+		reg_val = ioread64(mmio + limit_reg);
+		if (reg_val != limit) {
+			iowrite64(base, mmio + limit_reg);
+			iowrite64(0, mmio + xlat_reg);
+			return -EIO;
+		}
+	} else {
+		/* split bar addr range must all be 32 bit */
+		if (addr & (~0ull << 32))
+			return -EINVAL;
+		if ((addr + size) & (~0ull << 32))
+			return -EINVAL;
+
+		base = ioread32(mmio + base_reg);
+
+		/* Set the limit if supported, if size is not mw_size */
+		if (limit_reg && size != mw_size)
+			limit = base + size;
+		else
+			limit = 0;
+
+		/* set and verify setting the translation address */
+		iowrite32(addr, mmio + xlat_reg);
+		reg_val = ioread32(mmio + xlat_reg);
+		if (reg_val != addr) {
+			iowrite32(0, mmio + xlat_reg);
+			return -EIO;
+		}
+
+		/* set and verify setting the limit */
+		iowrite32(limit, mmio + limit_reg);
+		reg_val = ioread32(mmio + limit_reg);
+		if (reg_val != limit) {
+			iowrite32(base, mmio + limit_reg);
+			iowrite32(0, mmio + xlat_reg);
+			return -EIO;
+		}
+	}
+
+	return 0;
+}
+
+static int intel_ntb_link_is_up(struct ntb_dev *ntb,
+				enum ntb_speed *speed,
+				enum ntb_width *width)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	if (ndev->reg->link_is_up(ndev)) {
+		if (speed)
+			*speed = NTB_LNK_STA_SPEED(ndev->lnk_sta);
+		if (width)
+			*width = NTB_LNK_STA_WIDTH(ndev->lnk_sta);
+		return 1;
+	} else {
+		/* TODO MAYBE: is it possible to observe the link speed and
+		 * width while link is training? */
+		if (speed)
+			*speed = NTB_SPEED_NONE;
+		if (width)
+			*width = NTB_WIDTH_NONE;
+		return 0;
+	}
+}
+
+static int intel_ntb_link_enable(struct ntb_dev *ntb,
+				 enum ntb_speed max_speed,
+				 enum ntb_width max_width)
+{
+	struct intel_ntb_dev *ndev;
+	u32 ntb_ctl;
+
+	ndev = container_of(ntb, struct intel_ntb_dev, ntb);
+
+	if (ndev->ntb.topo == NTB_TOPO_SEC)
+		return -EINVAL;
+
+	dev_dbg(ndev_dev(ndev),
+		"Enabling link with max_speed %d max_width %d\n",
+		max_speed, max_width);
+	if (max_speed != NTB_SPEED_AUTO)
+		dev_dbg(ndev_dev(ndev), "ignoring max_speed %d\n", max_speed);
+	if (max_width != NTB_WIDTH_AUTO)
+		dev_dbg(ndev_dev(ndev), "ignoring max_width %d\n", max_width);
+
+	ntb_ctl = ioread32(ndev->self_mmio + ndev->reg->ntb_ctl);
+	ntb_ctl &= ~(NTB_CTL_DISABLE | NTB_CTL_CFG_LOCK);
+	ntb_ctl |= NTB_CTL_P2S_BAR2_SNOOP | NTB_CTL_S2P_BAR2_SNOOP;
+	ntb_ctl |= NTB_CTL_P2S_BAR4_SNOOP | NTB_CTL_S2P_BAR4_SNOOP;
+	if (ndev->bar4_split)
+		ntb_ctl |= NTB_CTL_P2S_BAR5_SNOOP | NTB_CTL_S2P_BAR5_SNOOP;
+	iowrite32(ntb_ctl, ndev->self_mmio + ndev->reg->ntb_ctl);
+
+	return 0;
+}
+
+static int intel_ntb_link_disable(struct ntb_dev *ntb)
+{
+	struct intel_ntb_dev *ndev;
+	u32 ntb_cntl;
+
+	ndev = container_of(ntb, struct intel_ntb_dev, ntb);
+
+	if (ndev->ntb.topo == NTB_TOPO_SEC)
+		return -EINVAL;
+
+	dev_dbg(ndev_dev(ndev), "Disabling link\n");
+
+	/* Bring NTB link down */
+	ntb_cntl = ioread32(ndev->self_mmio + ndev->reg->ntb_ctl);
+	ntb_cntl &= ~(NTB_CTL_P2S_BAR2_SNOOP | NTB_CTL_S2P_BAR2_SNOOP);
+	ntb_cntl &= ~(NTB_CTL_P2S_BAR4_SNOOP | NTB_CTL_S2P_BAR4_SNOOP);
+	if (ndev->bar4_split)
+		ntb_cntl &= ~(NTB_CTL_P2S_BAR5_SNOOP | NTB_CTL_S2P_BAR5_SNOOP);
+	ntb_cntl |= NTB_CTL_DISABLE | NTB_CTL_CFG_LOCK;
+	iowrite32(ntb_cntl, ndev->self_mmio + ndev->reg->ntb_ctl);
+
+	return 0;
+}
+
+static int intel_ntb_db_is_unsafe(struct ntb_dev *ntb)
+{
+	return ndev_ignore_unsafe(ntb_ndev(ntb), NTB_UNSAFE_DB);
+}
+
+static u64 intel_ntb_db_valid_mask(struct ntb_dev *ntb)
+{
+	return ntb_ndev(ntb)->db_valid_mask;
+}
+
+static int intel_ntb_db_vector_count(struct ntb_dev *ntb)
+{
+	struct intel_ntb_dev *ndev;
+
+	ndev = container_of(ntb, struct intel_ntb_dev, ntb);
+
+	return ndev->db_vec_count;
+}
+
+static u64 intel_ntb_db_vector_mask(struct ntb_dev *ntb, int db_vector)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	if (db_vector < 0 || db_vector > ndev->db_vec_count)
+		return 0;
+
+	return ndev->db_valid_mask & ndev_vec_mask(ndev, db_vector);
+}
+
+static u64 intel_ntb_db_read(struct ntb_dev *ntb)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_db_read(ndev,
+			    ndev->self_mmio +
+			    ndev->self_reg->db_bell);
+}
+
+static int intel_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_db_write(ndev, db_bits,
+			     ndev->self_mmio +
+			     ndev->self_reg->db_bell);
+}
+
+static int intel_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_db_set_mask(ndev, db_bits,
+				ndev->self_mmio +
+				ndev->self_reg->db_mask);
+}
+
+static int intel_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_db_clear_mask(ndev, db_bits,
+				  ndev->self_mmio +
+				  ndev->self_reg->db_mask);
+}
+
+static int intel_ntb_peer_db_addr(struct ntb_dev *ntb,
+				  phys_addr_t *db_addr,
+				  resource_size_t *db_size)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_db_addr(ndev, db_addr, db_size, ndev->peer_addr,
+			    ndev->peer_reg->db_bell);
+}
+
+static int intel_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_db_write(ndev, db_bits,
+			     ndev->peer_mmio +
+			     ndev->peer_reg->db_bell);
+}
+
+static int intel_ntb_spad_is_unsafe(struct ntb_dev *ntb)
+{
+	return ndev_ignore_unsafe(ntb_ndev(ntb), NTB_UNSAFE_SPAD);
+}
+
+static int intel_ntb_spad_count(struct ntb_dev *ntb)
+{
+	struct intel_ntb_dev *ndev;
+
+	ndev = container_of(ntb, struct intel_ntb_dev, ntb);
+
+	return ndev->spad_count;
+}
+
+static u32 intel_ntb_spad_read(struct ntb_dev *ntb, int idx)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_spad_read(ndev, idx,
+			      ndev->self_mmio +
+			      ndev->self_reg->spad);
+}
+
+static int intel_ntb_spad_write(struct ntb_dev *ntb,
+				int idx, u32 val)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_spad_write(ndev, idx, val,
+			       ndev->self_mmio +
+			       ndev->self_reg->spad);
+}
+
+static int intel_ntb_peer_spad_addr(struct ntb_dev *ntb, int idx,
+				    phys_addr_t *spad_addr)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_spad_addr(ndev, idx, spad_addr, ndev->peer_addr,
+			      ndev->peer_reg->spad);
+}
+
+static u32 intel_ntb_peer_spad_read(struct ntb_dev *ntb, int idx)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_spad_read(ndev, idx,
+			      ndev->peer_mmio +
+			      ndev->peer_reg->spad);
+}
+
+static int intel_ntb_peer_spad_write(struct ntb_dev *ntb,
+				     int idx, u32 val)
+{
+	struct intel_ntb_dev *ndev = ntb_ndev(ntb);
+
+	return ndev_spad_write(ndev, idx, val,
+			       ndev->peer_mmio +
+			       ndev->peer_reg->spad);
+}
+
+/* ATOM */
+
+static u64 atom_db_ioread(void __iomem *mmio)
+{
+	return ioread64(mmio);
+}
+
+static void atom_db_iowrite(u64 bits, void __iomem *mmio)
+{
+	iowrite64(bits, mmio);
+}
+
+static int atom_poll_link(struct intel_ntb_dev *ndev)
+{
+	u32 ntb_ctl;
+
+	ntb_ctl = ioread32(ndev->self_mmio + ATOM_NTBCNTL_OFFSET);
+
+	if (ntb_ctl == ndev->ntb_ctl)
+		return 0;
+
+	ndev->ntb_ctl = ntb_ctl;
+
+	ndev->lnk_sta = ioread32(ndev->self_mmio + ATOM_LINK_STATUS_OFFSET);
+
+	return 1;
+}
+
+static int atom_link_is_up(struct intel_ntb_dev *ndev)
+{
+	return ATOM_NTB_CTL_ACTIVE(ndev->ntb_ctl);
+}
+
+static int atom_link_is_err(struct intel_ntb_dev *ndev)
+{
+	if (ioread32(ndev->self_mmio + ATOM_LTSSMSTATEJMP_OFFSET)
+	    & ATOM_LTSSMSTATEJMP_FORCEDETECT)
+		return 1;
+
+	if (ioread32(ndev->self_mmio + ATOM_IBSTERRRCRVSTS0_OFFSET)
+	    & ATOM_IBIST_ERR_OFLOW)
+		return 1;
+
+	return 0;
+}
+
+static inline enum ntb_topo atom_ppd_topo(struct intel_ntb_dev *ndev, u32 ppd)
+{
+	switch (ppd & ATOM_PPD_TOPO_MASK) {
+	case ATOM_PPD_TOPO_B2B_USD:
+		dev_dbg(ndev_dev(ndev), "PPD %d B2B USD\n", ppd);
+		return NTB_TOPO_B2B_USD;
+
+	case ATOM_PPD_TOPO_B2B_DSD:
+		dev_dbg(ndev_dev(ndev), "PPD %d B2B DSD\n", ppd);
+		return NTB_TOPO_B2B_DSD;
+
+	case ATOM_PPD_TOPO_PRI_USD:
+	case ATOM_PPD_TOPO_PRI_DSD: /* accept bogus PRI_DSD */
+	case ATOM_PPD_TOPO_SEC_USD:
+	case ATOM_PPD_TOPO_SEC_DSD: /* accept bogus SEC_DSD */
+		dev_dbg(ndev_dev(ndev), "PPD %d non B2B disabled\n", ppd);
+		return NTB_TOPO_NONE;
+	}
+
+	dev_dbg(ndev_dev(ndev), "PPD %d invalid\n", ppd);
+	return NTB_TOPO_NONE;
+}
+
+static void atom_link_hb(struct work_struct *work)
+{
+	struct intel_ntb_dev *ndev = hb_ndev(work);
+	unsigned long poll_ts;
+	void __iomem *mmio;
+	u32 status32;
+
+	poll_ts = ndev->last_ts + ATOM_LINK_HB_TIMEOUT;
+
+	/* Delay polling the link status if an interrupt was received,
+	 * unless the cached link status says the link is down.
+	 */
+	if (time_after(poll_ts, jiffies) && atom_link_is_up(ndev)) {
+		schedule_delayed_work(&ndev->hb_timer, poll_ts - jiffies);
+		return;
+	}
+
+	if (atom_poll_link(ndev))
+		ntb_link_event(&ndev->ntb);
+
+	if (atom_link_is_up(ndev) || !atom_link_is_err(ndev)) {
+		schedule_delayed_work(&ndev->hb_timer, ATOM_LINK_HB_TIMEOUT);
+		return;
+	}
+
+	/* Link is down with error: recover the link! */
+
+	mmio = ndev->self_mmio;
+
+	/* Driver resets the NTB ModPhy lanes - magic! */
+	iowrite8(0xe0, mmio + ATOM_MODPHY_PCSREG6);
+	iowrite8(0x40, mmio + ATOM_MODPHY_PCSREG4);
+	iowrite8(0x60, mmio + ATOM_MODPHY_PCSREG4);
+	iowrite8(0x60, mmio + ATOM_MODPHY_PCSREG6);
+
+	/* Driver waits 100ms to allow the NTB ModPhy to settle */
+	msleep(100);
+
+	/* Clear AER Errors, write to clear */
+	status32 = ioread32(mmio + ATOM_ERRCORSTS_OFFSET);
+	dev_dbg(ndev_dev(ndev), "ERRCORSTS = %x\n", status32);
+	status32 &= PCI_ERR_COR_REP_ROLL;
+	iowrite32(status32, mmio + ATOM_ERRCORSTS_OFFSET);
+
+	/* Clear unexpected electrical idle event in LTSSM, write to clear */
+	status32 = ioread32(mmio + ATOM_LTSSMERRSTS0_OFFSET);
+	dev_dbg(ndev_dev(ndev), "LTSSMERRSTS0 = %x\n", status32);
+	status32 |= ATOM_LTSSMERRSTS0_UNEXPECTEDEI;
+	iowrite32(status32, mmio + ATOM_LTSSMERRSTS0_OFFSET);
+
+	/* Clear DeSkew Buffer error, write to clear */
+	status32 = ioread32(mmio + ATOM_DESKEWSTS_OFFSET);
+	dev_dbg(ndev_dev(ndev), "DESKEWSTS = %x\n", status32);
+	status32 |= ATOM_DESKEWSTS_DBERR;
+	iowrite32(status32, mmio + ATOM_DESKEWSTS_OFFSET);
+
+	status32 = ioread32(mmio + ATOM_IBSTERRRCRVSTS0_OFFSET);
+	dev_dbg(ndev_dev(ndev), "IBSTERRRCRVSTS0 = %x\n", status32);
+	status32 &= ATOM_IBIST_ERR_OFLOW;
+	iowrite32(status32, mmio + ATOM_IBSTERRRCRVSTS0_OFFSET);
+
+	/* Releases the NTB state machine to allow the link to retrain */
+	status32 = ioread32(mmio + ATOM_LTSSMSTATEJMP_OFFSET);
+	dev_dbg(ndev_dev(ndev), "LTSSMSTATEJMP = %x\n", status32);
+	status32 &= ~ATOM_LTSSMSTATEJMP_FORCEDETECT;
+	iowrite32(status32, mmio + ATOM_LTSSMSTATEJMP_OFFSET);
+
+	/* There is a potential race between the 2 NTB devices recovering at the
+	 * same time.  If the times are the same, the link will not recover and
+	 * the driver will be stuck in this loop forever.  Add a random interval
+	 * to the recovery time to prevent this race.
+	 */
+	schedule_delayed_work(&ndev->hb_timer, ATOM_LINK_RECOVERY_TIME
+			      + prandom_u32() % ATOM_LINK_RECOVERY_TIME);
+}
+
+static int atom_init_isr(struct intel_ntb_dev *ndev)
+{
+	int rc;
+
+	rc = ndev_init_isr(ndev, 1, ATOM_DB_MSIX_VECTOR_COUNT,
+			   ATOM_DB_MSIX_VECTOR_SHIFT, ATOM_DB_TOTAL_SHIFT);
+	if (rc)
+		return rc;
+
+	/* ATOM doesn't have link status interrupt, poll on that platform */
+	ndev->last_ts = jiffies;
+	INIT_DELAYED_WORK(&ndev->hb_timer, atom_link_hb);
+	schedule_delayed_work(&ndev->hb_timer, ATOM_LINK_HB_TIMEOUT);
+
+	return 0;
+}
+
+static void atom_deinit_isr(struct intel_ntb_dev *ndev)
+{
+	cancel_delayed_work_sync(&ndev->hb_timer);
+	ndev_deinit_isr(ndev);
+}
+
+static int atom_init_ntb(struct intel_ntb_dev *ndev)
+{
+	ndev->mw_count = ATOM_MW_COUNT;
+	ndev->spad_count = ATOM_SPAD_COUNT;
+	ndev->db_count = ATOM_DB_COUNT;
+
+	switch (ndev->ntb.topo) {
+	case NTB_TOPO_B2B_USD:
+	case NTB_TOPO_B2B_DSD:
+		ndev->self_reg = &atom_pri_reg;
+		ndev->peer_reg = &atom_b2b_reg;
+		ndev->xlat_reg = &atom_sec_xlat;
+
+		/* Enable Bus Master and Memory Space on the secondary side */
+		iowrite16(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER,
+			  ndev->self_mmio + ATOM_SPCICMD_OFFSET);
+
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
+
+	return 0;
+}
+
+static int atom_init_dev(struct intel_ntb_dev *ndev)
+{
+	u32 ppd;
+	int rc;
+
+	rc = pci_read_config_dword(ndev->ntb.pdev, ATOM_PPD_OFFSET, &ppd);
+	if (rc)
+		return -EIO;
+
+	ndev->ntb.topo = atom_ppd_topo(ndev, ppd);
+	if (ndev->ntb.topo == NTB_TOPO_NONE)
+		return -EINVAL;
+
+	rc = atom_init_ntb(ndev);
+	if (rc)
+		return rc;
+
+	rc = atom_init_isr(ndev);
+	if (rc)
+		return rc;
+
+	if (ndev->ntb.topo != NTB_TOPO_SEC) {
+		/* Initiate PCI-E link training */
+		rc = pci_write_config_dword(ndev->ntb.pdev, ATOM_PPD_OFFSET,
+					    ppd | ATOM_PPD_INIT_LINK);
+		if (rc)
+			return rc;
+	}
+
+	return 0;
+}
+
+static void atom_deinit_dev(struct intel_ntb_dev *ndev)
+{
+	atom_deinit_isr(ndev);
+}
+
+/* XEON */
+
+static u64 xeon_db_ioread(void __iomem *mmio)
+{
+	return (u64)ioread16(mmio);
+}
+
+static void xeon_db_iowrite(u64 bits, void __iomem *mmio)
+{
+	iowrite16((u16)bits, mmio);
+}
+
+static int xeon_poll_link(struct intel_ntb_dev *ndev)
+{
+	u16 reg_val;
+	int rc;
+
+	ndev->reg->db_iowrite(ndev->db_link_mask,
+			      ndev->self_mmio +
+			      ndev->self_reg->db_bell);
+
+	rc = pci_read_config_word(ndev->ntb.pdev,
+				  XEON_LINK_STATUS_OFFSET, &reg_val);
+	if (rc)
+		return 0;
+
+	if (reg_val == ndev->lnk_sta)
+		return 0;
+
+	ndev->lnk_sta = reg_val;
+
+	return 1;
+}
+
+static int xeon_link_is_up(struct intel_ntb_dev *ndev)
+{
+	if (ndev->ntb.topo == NTB_TOPO_SEC)
+		return 1;
+
+	return NTB_LNK_STA_ACTIVE(ndev->lnk_sta);
+}
+
+static inline enum ntb_topo xeon_ppd_topo(struct intel_ntb_dev *ndev, u8 ppd)
+{
+	switch (ppd & XEON_PPD_TOPO_MASK) {
+	case XEON_PPD_TOPO_B2B_USD:
+		return NTB_TOPO_B2B_USD;
+
+	case XEON_PPD_TOPO_B2B_DSD:
+		return NTB_TOPO_B2B_DSD;
+
+	case XEON_PPD_TOPO_PRI_USD:
+	case XEON_PPD_TOPO_PRI_DSD: /* accept bogus PRI_DSD */
+		return NTB_TOPO_PRI;
+
+	case XEON_PPD_TOPO_SEC_USD:
+	case XEON_PPD_TOPO_SEC_DSD: /* accept bogus SEC_DSD */
+		return NTB_TOPO_SEC;
+	}
+
+	return NTB_TOPO_NONE;
+}
+
+static inline int xeon_ppd_bar4_split(struct intel_ntb_dev *ndev, u8 ppd)
+{
+	if (ppd & XEON_PPD_SPLIT_BAR_MASK) {
+		dev_dbg(ndev_dev(ndev), "PPD %d split bar\n", ppd);
+		return 1;
+	}
+	return 0;
+}
+
+static int xeon_init_isr(struct intel_ntb_dev *ndev)
+{
+	return ndev_init_isr(ndev, XEON_DB_MSIX_VECTOR_COUNT,
+			     XEON_DB_MSIX_VECTOR_COUNT,
+			     XEON_DB_MSIX_VECTOR_SHIFT,
+			     XEON_DB_TOTAL_SHIFT);
+}
+
+static void xeon_deinit_isr(struct intel_ntb_dev *ndev)
+{
+	ndev_deinit_isr(ndev);
+}
+
+static int xeon_setup_b2b_mw(struct intel_ntb_dev *ndev,
+			     const struct intel_b2b_addr *addr,
+			     const struct intel_b2b_addr *peer_addr)
+{
+	struct pci_dev *pdev;
+	void __iomem *mmio;
+	resource_size_t bar_size;
+	phys_addr_t bar_addr;
+	int b2b_bar;
+	u8 bar_sz;
+
+	pdev = ndev_pdev(ndev);
+	mmio = ndev->self_mmio;
+
+	if (ndev->b2b_idx == UINT_MAX) {
+		dev_dbg(ndev_dev(ndev), "not using b2b mw\n");
+		b2b_bar = 0;
+		ndev->b2b_off = 0;
+	} else {
+		b2b_bar = ndev_mw_to_bar(ndev, ndev->b2b_idx);
+		if (b2b_bar < 0)
+			return -EIO;
+
+		dev_dbg(ndev_dev(ndev), "using b2b mw bar %d\n", b2b_bar);
+
+		bar_size = pci_resource_len(ndev->ntb.pdev, b2b_bar);
+
+		dev_dbg(ndev_dev(ndev), "b2b bar size %#llx\n", bar_size);
+
+		if (b2b_mw_share && XEON_B2B_MIN_SIZE <= bar_size >> 1) {
+			dev_dbg(ndev_dev(ndev),
+				"b2b using first half of bar\n");
+			ndev->b2b_off = bar_size >> 1;
+		} else if (XEON_B2B_MIN_SIZE <= bar_size) {
+			dev_dbg(ndev_dev(ndev),
+				"b2b using whole bar\n");
+			ndev->b2b_off = 0;
+			--ndev->mw_count;
+		} else {
+			dev_dbg(ndev_dev(ndev),
+				"b2b bar size is too small\n");
+			return -EIO;
+		}
+	}
+
+	/* Reset the secondary bar sizes to match the primary bar sizes,
+	 * except disable or halve the size of the b2b secondary bar.
+	 *
+	 * Note: code for each specific bar size register, because the register
+	 * offsets are not in a consistent order (bar5sz comes after ppd, odd).
+	 */
+	pci_read_config_byte(pdev, XEON_PBAR23SZ_OFFSET, &bar_sz);
+	dev_dbg(ndev_dev(ndev), "PBAR23SZ %#x\n", bar_sz);
+	if (b2b_bar == 2) {
+		if (ndev->b2b_off)
+			bar_sz -= 1;
+		else
+			bar_sz = 0;
+	}
+	pci_write_config_byte(pdev, XEON_SBAR23SZ_OFFSET, bar_sz);
+	pci_read_config_byte(pdev, XEON_SBAR23SZ_OFFSET, &bar_sz);
+	dev_dbg(ndev_dev(ndev), "SBAR23SZ %#x\n", bar_sz);
+
+	if (!ndev->bar4_split) {
+		pci_read_config_byte(pdev, XEON_PBAR45SZ_OFFSET, &bar_sz);
+		dev_dbg(ndev_dev(ndev), "PBAR45SZ %#x\n", bar_sz);
+		if (b2b_bar == 4) {
+			if (ndev->b2b_off)
+				bar_sz -= 1;
+			else
+				bar_sz = 0;
+		}
+		pci_write_config_byte(pdev, XEON_SBAR45SZ_OFFSET, bar_sz);
+		pci_read_config_byte(pdev, XEON_SBAR45SZ_OFFSET, &bar_sz);
+		dev_dbg(ndev_dev(ndev), "SBAR45SZ %#x\n", bar_sz);
+	} else {
+		pci_read_config_byte(pdev, XEON_PBAR4SZ_OFFSET, &bar_sz);
+		dev_dbg(ndev_dev(ndev), "PBAR4SZ %#x\n", bar_sz);
+		if (b2b_bar == 4) {
+			if (ndev->b2b_off)
+				bar_sz -= 1;
+			else
+				bar_sz = 0;
+		}
+		pci_write_config_byte(pdev, XEON_SBAR4SZ_OFFSET, bar_sz);
+		pci_read_config_byte(pdev, XEON_SBAR4SZ_OFFSET, &bar_sz);
+		dev_dbg(ndev_dev(ndev), "SBAR4SZ %#x\n", bar_sz);
+
+		pci_read_config_byte(pdev, XEON_PBAR5SZ_OFFSET, &bar_sz);
+		dev_dbg(ndev_dev(ndev), "PBAR5SZ %#x\n", bar_sz);
+		if (b2b_bar == 5) {
+			if (ndev->b2b_off)
+				bar_sz -= 1;
+			else
+				bar_sz = 0;
+		}
+		pci_write_config_byte(pdev, XEON_SBAR5SZ_OFFSET, bar_sz);
+		pci_read_config_byte(pdev, XEON_SBAR5SZ_OFFSET, &bar_sz);
+		dev_dbg(ndev_dev(ndev), "SBAR5SZ %#x\n", bar_sz);
+	}
+
+	/* SBAR01 hit by first part of the b2b bar */
+	if (b2b_bar == 0)
+		bar_addr = addr->bar0_addr;
+	else if (b2b_bar == 2)
+		bar_addr = addr->bar2_addr64;
+	else if (b2b_bar == 4 && !ndev->bar4_split)
+		bar_addr = addr->bar4_addr64;
+	else if (b2b_bar == 4)
+		bar_addr = addr->bar4_addr32;
+	else if (b2b_bar == 5)
+		bar_addr = addr->bar5_addr32;
+	else
+		return -EIO;
+
+	dev_dbg(ndev_dev(ndev), "SBAR01 %#018llx\n", bar_addr);
+	iowrite64(bar_addr, mmio + XEON_SBAR0BASE_OFFSET);
+
+	/* Other SBAR are normally hit by the PBAR xlat, except for b2b bar.
+	 * The b2b bar is either disabled above, or configured half-size, and
+	 * it starts at the PBAR xlat + offset.
+	 */
+
+	bar_addr = addr->bar2_addr64 + (b2b_bar == 2 ? ndev->b2b_off : 0);
+	iowrite64(bar_addr, mmio + XEON_SBAR23BASE_OFFSET);
+	bar_addr = ioread64(mmio + XEON_SBAR23BASE_OFFSET);
+	dev_dbg(ndev_dev(ndev), "SBAR23 %#018llx\n", bar_addr);
+
+	if (!ndev->bar4_split) {
+		bar_addr = addr->bar4_addr64 +
+			(b2b_bar == 4 ? ndev->b2b_off : 0);
+		iowrite64(bar_addr, mmio + XEON_SBAR45BASE_OFFSET);
+		bar_addr = ioread64(mmio + XEON_SBAR45BASE_OFFSET);
+		dev_dbg(ndev_dev(ndev), "SBAR45 %#018llx\n", bar_addr);
+	} else {
+		bar_addr = addr->bar4_addr32 +
+			(b2b_bar == 4 ? ndev->b2b_off : 0);
+		iowrite32(bar_addr, mmio + XEON_SBAR4BASE_OFFSET);
+		bar_addr = ioread32(mmio + XEON_SBAR4BASE_OFFSET);
+		dev_dbg(ndev_dev(ndev), "SBAR4 %#010llx\n", bar_addr);
+
+		bar_addr = addr->bar5_addr32 +
+			(b2b_bar == 5 ? ndev->b2b_off : 0);
+		iowrite32(bar_addr, mmio + XEON_SBAR5BASE_OFFSET);
+		bar_addr = ioread32(mmio + XEON_SBAR5BASE_OFFSET);
+		dev_dbg(ndev_dev(ndev), "SBAR5 %#010llx\n", bar_addr);
+	}
+
+	/* setup incoming bar limits == base addrs (zero length windows) */
+
+	bar_addr = addr->bar2_addr64 + (b2b_bar == 2 ? ndev->b2b_off : 0);
+	iowrite64(bar_addr, mmio + XEON_SBAR23LMT_OFFSET);
+	bar_addr = ioread64(mmio + XEON_SBAR23LMT_OFFSET);
+	dev_dbg(ndev_dev(ndev), "SBAR23LMT %#018llx\n", bar_addr);
+
+	if (!ndev->bar4_split) {
+		bar_addr = addr->bar4_addr64 +
+			(b2b_bar == 4 ? ndev->b2b_off : 0);
+		iowrite64(bar_addr, mmio + XEON_SBAR45LMT_OFFSET);
+		bar_addr = ioread64(mmio + XEON_SBAR45LMT_OFFSET);
+		dev_dbg(ndev_dev(ndev), "SBAR45LMT %#018llx\n", bar_addr);
+	} else {
+		bar_addr = addr->bar4_addr32 +
+			(b2b_bar == 4 ? ndev->b2b_off : 0);
+		iowrite32(bar_addr, mmio + XEON_SBAR4LMT_OFFSET);
+		bar_addr = ioread32(mmio + XEON_SBAR4LMT_OFFSET);
+		dev_dbg(ndev_dev(ndev), "SBAR4LMT %#010llx\n", bar_addr);
+
+		bar_addr = addr->bar5_addr32 +
+			(b2b_bar == 5 ? ndev->b2b_off : 0);
+		iowrite32(bar_addr, mmio + XEON_SBAR5LMT_OFFSET);
+		bar_addr = ioread32(mmio + XEON_SBAR5LMT_OFFSET);
+		dev_dbg(ndev_dev(ndev), "SBAR5LMT %#05llx\n", bar_addr);
+	}
+
+	/* zero incoming translation addrs */
+	iowrite64(0, mmio + XEON_SBAR23XLAT_OFFSET);
+
+	if (!ndev->bar4_split) {
+		iowrite64(0, mmio + XEON_SBAR45XLAT_OFFSET);
+	} else {
+		iowrite32(0, mmio + XEON_SBAR4XLAT_OFFSET);
+		iowrite32(0, mmio + XEON_SBAR5XLAT_OFFSET);
+	}
+
+	/* zero outgoing translation limits (whole bar size windows) */
+	iowrite64(0, mmio + XEON_PBAR23LMT_OFFSET);
+	if (!ndev->bar4_split) {
+		iowrite64(0, mmio + XEON_PBAR45LMT_OFFSET);
+	} else {
+		iowrite32(0, mmio + XEON_PBAR4LMT_OFFSET);
+		iowrite32(0, mmio + XEON_PBAR5LMT_OFFSET);
+	}
+
+	/* set outgoing translation offsets */
+	bar_addr = peer_addr->bar2_addr64;
+	iowrite64(bar_addr, mmio + XEON_PBAR23XLAT_OFFSET);
+	bar_addr = ioread64(mmio + XEON_PBAR23XLAT_OFFSET);
+	dev_dbg(ndev_dev(ndev), "PBAR23XLAT %#018llx\n", bar_addr);
+
+	if (!ndev->bar4_split) {
+		bar_addr = peer_addr->bar4_addr64;
+		iowrite64(bar_addr, mmio + XEON_PBAR45XLAT_OFFSET);
+		bar_addr = ioread64(mmio + XEON_PBAR45XLAT_OFFSET);
+		dev_dbg(ndev_dev(ndev), "PBAR45XLAT %#018llx\n", bar_addr);
+	} else {
+		bar_addr = peer_addr->bar4_addr32;
+		iowrite32(bar_addr, mmio + XEON_PBAR4XLAT_OFFSET);
+		bar_addr = ioread32(mmio + XEON_PBAR4XLAT_OFFSET);
+		dev_dbg(ndev_dev(ndev), "PBAR4XLAT %#010llx\n", bar_addr);
+
+		bar_addr = peer_addr->bar5_addr32;
+		iowrite32(bar_addr, mmio + XEON_PBAR5XLAT_OFFSET);
+		bar_addr = ioread32(mmio + XEON_PBAR5XLAT_OFFSET);
+		dev_dbg(ndev_dev(ndev), "PBAR5XLAT %#010llx\n", bar_addr);
+	}
+
+	/* set the translation offset for b2b registers */
+	if (b2b_bar == 0)
+		bar_addr = peer_addr->bar0_addr;
+	else if (b2b_bar == 2)
+		bar_addr = peer_addr->bar2_addr64;
+	else if (b2b_bar == 4 && !ndev->bar4_split)
+		bar_addr = peer_addr->bar4_addr64;
+	else if (b2b_bar == 4)
+		bar_addr = peer_addr->bar4_addr32;
+	else if (b2b_bar == 5)
+		bar_addr = peer_addr->bar5_addr32;
+	else
+		return -EIO;
+
+	/* B2B_XLAT_OFFSET is 64bit, but can only take 32bit writes */
+	dev_dbg(ndev_dev(ndev), "B2BXLAT %#018llx\n", bar_addr);
+	iowrite32(bar_addr, mmio + XEON_B2B_XLAT_OFFSETL);
+	iowrite32(bar_addr >> 32, mmio + XEON_B2B_XLAT_OFFSETU);
+
+	if (b2b_bar) {
+		/* map peer ntb mmio config space registers */
+		ndev->peer_mmio = pci_iomap(pdev, b2b_bar,
+					    XEON_B2B_MIN_SIZE);
+		if (!ndev->peer_mmio)
+			return -EIO;
+	}
+
+	return 0;
+}
+
+static int xeon_init_ntb(struct intel_ntb_dev *ndev)
+{
+	int rc;
+	u32 ntb_ctl;
+
+	if (ndev->bar4_split)
+		ndev->mw_count = HSX_SPLIT_BAR_MW_COUNT;
+	else
+		ndev->mw_count = XEON_MW_COUNT;
+
+	ndev->spad_count = XEON_SPAD_COUNT;
+	ndev->db_count = XEON_DB_COUNT;
+	ndev->db_link_mask = XEON_DB_LINK_BIT;
+
+	switch (ndev->ntb.topo) {
+	case NTB_TOPO_PRI:
+		if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) {
+			dev_err(ndev_dev(ndev), "NTB Primary config disabled\n");
+			return -EINVAL;
+		}
+
+		/* enable link to allow secondary side device to appear */
+		ntb_ctl = ioread32(ndev->self_mmio + ndev->reg->ntb_ctl);
+		ntb_ctl &= ~NTB_CTL_DISABLE;
+		iowrite32(ntb_ctl, ndev->self_mmio + ndev->reg->ntb_ctl);
+
+		/* use half the spads for the peer */
+		ndev->spad_count >>= 1;
+		ndev->self_reg = &xeon_pri_reg;
+		ndev->peer_reg = &xeon_sec_reg;
+		ndev->xlat_reg = &xeon_sec_xlat;
+		break;
+
+	case NTB_TOPO_SEC:
+		if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) {
+			dev_err(ndev_dev(ndev), "NTB Secondary config disabled\n");
+			return -EINVAL;
+		}
+		/* use half the spads for the peer */
+		ndev->spad_count >>= 1;
+		ndev->self_reg = &xeon_sec_reg;
+		ndev->peer_reg = &xeon_pri_reg;
+		ndev->xlat_reg = &xeon_pri_xlat;
+		break;
+
+	case NTB_TOPO_B2B_USD:
+	case NTB_TOPO_B2B_DSD:
+		ndev->self_reg = &xeon_pri_reg;
+		ndev->peer_reg = &xeon_b2b_reg;
+		ndev->xlat_reg = &xeon_sec_xlat;
+
+		if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) {
+			ndev->peer_reg = &xeon_pri_reg;
+
+			if (b2b_mw_idx < 0)
+				ndev->b2b_idx = b2b_mw_idx + ndev->mw_count;
+			else
+				ndev->b2b_idx = b2b_mw_idx;
+
+			if (ndev->b2b_idx >= ndev->mw_count) {
+				dev_dbg(ndev_dev(ndev),
+					"b2b_mw_idx %d invalid for mw_count %u\n",
+					b2b_mw_idx, ndev->mw_count);
+				return -EINVAL;
+			}
+
+			dev_dbg(ndev_dev(ndev),
+				"setting up b2b mw idx %d means %d\n",
+				b2b_mw_idx, ndev->b2b_idx);
+
+		} else if (ndev->hwerr_flags & NTB_HWERR_B2BDOORBELL_BIT14) {
+			dev_warn(ndev_dev(ndev), "Reduce doorbell count by 1\n");
+			ndev->db_count -= 1;
+		}
+
+		if (ndev->ntb.topo == NTB_TOPO_B2B_USD) {
+			rc = xeon_setup_b2b_mw(ndev,
+					       &xeon_b2b_dsd_addr,
+					       &xeon_b2b_usd_addr);
+		} else {
+			rc = xeon_setup_b2b_mw(ndev,
+					       &xeon_b2b_usd_addr,
+					       &xeon_b2b_dsd_addr);
+		}
+		if (rc)
+			return rc;
+
+		/* Enable Bus Master and Memory Space on the secondary side */
+		iowrite16(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER,
+			  ndev->self_mmio + XEON_SPCICMD_OFFSET);
+
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
+
+	ndev->reg->db_iowrite(ndev->db_valid_mask,
+			      ndev->self_mmio +
+			      ndev->self_reg->db_mask);
+
+	return 0;
+}
+
+static int xeon_init_dev(struct intel_ntb_dev *ndev)
+{
+	struct pci_dev *pdev;
+	u8 ppd;
+	int rc, mem;
+
+	pdev = ndev_pdev(ndev);
+
+	switch (pdev->device) {
+	/* There is a Xeon hardware errata related to writes to SDOORBELL or
+	 * B2BDOORBELL in conjunction with inbound access to NTB MMIO Space,
+	 * which may hang the system.  To workaround this use the second memory
+	 * window to access the interrupt and scratch pad registers on the
+	 * remote system.
+	 */
+	case PCI_DEVICE_ID_INTEL_NTB_SS_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
+		ndev->hwerr_flags |= NTB_HWERR_SDOORBELL_LOCKUP;
+		break;
+	}
+
+	switch (pdev->device) {
+	/* There is a hardware errata related to accessing any register in
+	 * SB01BASE in the presence of bidirectional traffic crossing the NTB.
+	 */
+	case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
+		ndev->hwerr_flags |= NTB_HWERR_SB01BASE_LOCKUP;
+		break;
+	}
+
+	switch (pdev->device) {
+	/* HW Errata on bit 14 of b2bdoorbell register.  Writes will not be
+	 * mirrored to the remote system.  Shrink the number of bits by one,
+	 * since bit 14 is the last bit.
+	 */
+	case PCI_DEVICE_ID_INTEL_NTB_SS_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX:
+	case PCI_DEVICE_ID_INTEL_NTB_SS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_PS_BDX:
+	case PCI_DEVICE_ID_INTEL_NTB_B2B_BDX:
+		ndev->hwerr_flags |= NTB_HWERR_B2BDOORBELL_BIT14;
+		break;
+	}
+
+	ndev->reg = &xeon_reg;
+
+	rc = pci_read_config_byte(pdev, XEON_PPD_OFFSET, &ppd);
+	if (rc)
+		return -EIO;
+
+	ndev->ntb.topo = xeon_ppd_topo(ndev, ppd);
+	dev_dbg(ndev_dev(ndev), "ppd %#x topo %s\n", ppd,
+		ntb_topo_string(ndev->ntb.topo));
+	if (ndev->ntb.topo == NTB_TOPO_NONE)
+		return -EINVAL;
+
+	if (ndev->ntb.topo != NTB_TOPO_SEC) {
+		ndev->bar4_split = xeon_ppd_bar4_split(ndev, ppd);
+		dev_dbg(ndev_dev(ndev), "ppd %#x bar4_split %d\n",
+			ppd, ndev->bar4_split);
+	} else {
+		/* This is a way for transparent BAR to figure out if we are
+		 * doing split BAR or not. There is no way for the hw on the
+		 * transparent side to know and set the PPD.
+		 */
+		mem = pci_select_bars(pdev, IORESOURCE_MEM);
+		ndev->bar4_split = hweight32(mem) ==
+			HSX_SPLIT_BAR_MW_COUNT + 1;
+		dev_dbg(ndev_dev(ndev), "mem %#x bar4_split %d\n",
+			mem, ndev->bar4_split);
+	}
+
+	rc = xeon_init_ntb(ndev);
+	if (rc)
+		return rc;
+
+	return xeon_init_isr(ndev);
+}
+
+static void xeon_deinit_dev(struct intel_ntb_dev *ndev)
+{
+	xeon_deinit_isr(ndev);
+}
+
+static int intel_ntb_init_pci(struct intel_ntb_dev *ndev, struct pci_dev *pdev)
+{
+	int rc;
+
+	pci_set_drvdata(pdev, ndev);
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		goto err_pci_enable;
+
+	rc = pci_request_regions(pdev, NTB_NAME);
+	if (rc)
+		goto err_pci_regions;
+
+	pci_set_master(pdev);
+
+	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (rc) {
+		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (rc)
+			goto err_dma_mask;
+		dev_warn(ndev_dev(ndev), "Cannot DMA highmem\n");
+	}
+
+	rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (rc) {
+		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (rc)
+			goto err_dma_mask;
+		dev_warn(ndev_dev(ndev), "Cannot DMA consistent highmem\n");
+	}
+
+	ndev->self_mmio = pci_iomap(pdev, 0, 0);
+	if (!ndev->self_mmio) {
+		rc = -EIO;
+		goto err_mmio;
+	}
+	ndev->peer_mmio = ndev->self_mmio;
+
+	return 0;
+
+err_mmio:
+err_dma_mask:
+	pci_clear_master(pdev);
+	pci_release_regions(pdev);
+err_pci_regions:
+	pci_disable_device(pdev);
+err_pci_enable:
+	pci_set_drvdata(pdev, NULL);
+	return rc;
+}
+
+static void intel_ntb_deinit_pci(struct intel_ntb_dev *ndev)
+{
+	struct pci_dev *pdev = ndev_pdev(ndev);
+
+	if (ndev->peer_mmio && ndev->peer_mmio != ndev->self_mmio)
+		pci_iounmap(pdev, ndev->peer_mmio);
+	pci_iounmap(pdev, ndev->self_mmio);
+
+	pci_clear_master(pdev);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+}
+
+static inline void ndev_init_struct(struct intel_ntb_dev *ndev,
+				    struct pci_dev *pdev)
+{
+	ndev->ntb.pdev = pdev;
+	ndev->ntb.topo = NTB_TOPO_NONE;
+	ndev->ntb.ops = &intel_ntb_ops;
+
+	ndev->b2b_off = 0;
+	ndev->b2b_idx = UINT_MAX;
+
+	ndev->bar4_split = 0;
+
+	ndev->mw_count = 0;
+	ndev->spad_count = 0;
+	ndev->db_count = 0;
+	ndev->db_vec_count = 0;
+	ndev->db_vec_shift = 0;
+
+	ndev->ntb_ctl = 0;
+	ndev->lnk_sta = 0;
+
+	ndev->db_valid_mask = 0;
+	ndev->db_link_mask = 0;
+	ndev->db_mask = 0;
+
+	spin_lock_init(&ndev->db_mask_lock);
+}
+
+static int intel_ntb_pci_probe(struct pci_dev *pdev,
+			       const struct pci_device_id *id)
+{
+	struct intel_ntb_dev *ndev;
+	int rc, node;
+
+	node = dev_to_node(&pdev->dev);
+
+	if (pdev_is_atom(pdev)) {
+		ndev = kzalloc_node(sizeof(*ndev), GFP_KERNEL, node);
+		if (!ndev) {
+			rc = -ENOMEM;
+			goto err_ndev;
+		}
+
+		ndev_init_struct(ndev, pdev);
+
+		rc = intel_ntb_init_pci(ndev, pdev);
+		if (rc)
+			goto err_init_pci;
+
+		rc = atom_init_dev(ndev);
+		if (rc)
+			goto err_init_dev;
+
+	} else if (pdev_is_xeon(pdev)) {
+		ndev = kzalloc_node(sizeof(*ndev), GFP_KERNEL, node);
+		if (!ndev) {
+			rc = -ENOMEM;
+			goto err_ndev;
+		}
+
+		ndev_init_struct(ndev, pdev);
+
+		rc = intel_ntb_init_pci(ndev, pdev);
+		if (rc)
+			goto err_init_pci;
+
+		rc = xeon_init_dev(ndev);
+		if (rc)
+			goto err_init_dev;
+
+	} else {
+		rc = -EINVAL;
+		goto err_ndev;
+	}
+
+	ndev_reset_unsafe_flags(ndev);
+
+	ndev->reg->poll_link(ndev);
+
+	ndev_init_debugfs(ndev);
+
+	rc = ntb_register_device(&ndev->ntb);
+	if (rc)
+		goto err_register;
+
+	dev_info(&pdev->dev, "NTB device registered.\n");
+
+	return 0;
+
+err_register:
+	ndev_deinit_debugfs(ndev);
+	if (pdev_is_atom(pdev))
+		atom_deinit_dev(ndev);
+	else if (pdev_is_xeon(pdev))
+		xeon_deinit_dev(ndev);
+err_init_dev:
+	intel_ntb_deinit_pci(ndev);
+err_init_pci:
+	kfree(ndev);
+err_ndev:
+	return rc;
+}
+
+static void intel_ntb_pci_remove(struct pci_dev *pdev)
+{
+	struct intel_ntb_dev *ndev = pci_get_drvdata(pdev);
+
+	ntb_unregister_device(&ndev->ntb);
+	ndev_deinit_debugfs(ndev);
+	if (pdev_is_atom(pdev))
+		atom_deinit_dev(ndev);
+	else if (pdev_is_xeon(pdev))
+		xeon_deinit_dev(ndev);
+	intel_ntb_deinit_pci(ndev);
+	kfree(ndev);
+}
+
+static const struct intel_ntb_reg atom_reg = {
+	.poll_link		= atom_poll_link,
+	.link_is_up		= atom_link_is_up,
+	.db_ioread		= atom_db_ioread,
+	.db_iowrite		= atom_db_iowrite,
+	.db_size		= sizeof(u64),
+	.ntb_ctl		= ATOM_NTBCNTL_OFFSET,
+	.mw_bar			= {2, 4},
+};
+
+static const struct intel_ntb_alt_reg atom_pri_reg = {
+	.db_bell		= ATOM_PDOORBELL_OFFSET,
+	.db_mask		= ATOM_PDBMSK_OFFSET,
+	.spad			= ATOM_SPAD_OFFSET,
+};
+
+static const struct intel_ntb_alt_reg atom_b2b_reg = {
+	.db_bell		= ATOM_B2B_DOORBELL_OFFSET,
+	.spad			= ATOM_B2B_SPAD_OFFSET,
+};
+
+static const struct intel_ntb_xlat_reg atom_sec_xlat = {
+	/* FIXME : .bar0_base	= ATOM_SBAR0BASE_OFFSET, */
+	/* FIXME : .bar2_limit	= ATOM_SBAR2LMT_OFFSET, */
+	.bar2_xlat		= ATOM_SBAR2XLAT_OFFSET,
+};
+
+static const struct intel_ntb_reg xeon_reg = {
+	.poll_link		= xeon_poll_link,
+	.link_is_up		= xeon_link_is_up,
+	.db_ioread		= xeon_db_ioread,
+	.db_iowrite		= xeon_db_iowrite,
+	.db_size		= sizeof(u32),
+	.ntb_ctl		= XEON_NTBCNTL_OFFSET,
+	.mw_bar			= {2, 4, 5},
+};
+
+static const struct intel_ntb_alt_reg xeon_pri_reg = {
+	.db_bell		= XEON_PDOORBELL_OFFSET,
+	.db_mask		= XEON_PDBMSK_OFFSET,
+	.spad			= XEON_SPAD_OFFSET,
+};
+
+static const struct intel_ntb_alt_reg xeon_sec_reg = {
+	.db_bell		= XEON_SDOORBELL_OFFSET,
+	.db_mask		= XEON_SDBMSK_OFFSET,
+	/* second half of the scratchpads */
+	.spad			= XEON_SPAD_OFFSET + (XEON_SPAD_COUNT << 1),
+};
+
+static const struct intel_ntb_alt_reg xeon_b2b_reg = {
+	.db_bell		= XEON_B2B_DOORBELL_OFFSET,
+	.spad			= XEON_B2B_SPAD_OFFSET,
+};
+
+static const struct intel_ntb_xlat_reg xeon_pri_xlat = {
+	/* Note: no primary .bar0_base visible to the secondary side.
+	 *
+	 * The secondary side cannot get the base address stored in primary
+	 * bars.  The base address is necessary to set the limit register to
+	 * any value other than zero, or unlimited.
+	 *
+	 * WITHOUT THE BASE ADDRESS, THE SECONDARY SIDE CANNOT DISABLE the
+	 * window by setting the limit equal to base, nor can it limit the size
+	 * of the memory window by setting the limit to base + size.
+	 */
+	.bar2_limit		= XEON_PBAR23LMT_OFFSET,
+	.bar2_xlat		= XEON_PBAR23XLAT_OFFSET,
+};
+
+static const struct intel_ntb_xlat_reg xeon_sec_xlat = {
+	.bar0_base		= XEON_SBAR0BASE_OFFSET,
+	.bar2_limit		= XEON_SBAR23LMT_OFFSET,
+	.bar2_xlat		= XEON_SBAR23XLAT_OFFSET,
+};
+
+static struct intel_b2b_addr xeon_b2b_usd_addr = {
+	.bar2_addr64		= XEON_B2B_BAR2_ADDR64,
+	.bar4_addr64		= XEON_B2B_BAR4_ADDR64,
+	.bar4_addr32		= XEON_B2B_BAR4_ADDR32,
+	.bar5_addr32		= XEON_B2B_BAR5_ADDR32,
+};
+
+static struct intel_b2b_addr xeon_b2b_dsd_addr = {
+	.bar2_addr64		= XEON_B2B_BAR2_ADDR64,
+	.bar4_addr64		= XEON_B2B_BAR4_ADDR64,
+	.bar4_addr32		= XEON_B2B_BAR4_ADDR32,
+	.bar5_addr32		= XEON_B2B_BAR5_ADDR32,
+};
+
+/* operations for primary side of local ntb */
+static const struct ntb_dev_ops intel_ntb_ops = {
+	.mw_count		= intel_ntb_mw_count,
+	.mw_get_range		= intel_ntb_mw_get_range,
+	.mw_set_trans		= intel_ntb_mw_set_trans,
+	.link_is_up		= intel_ntb_link_is_up,
+	.link_enable		= intel_ntb_link_enable,
+	.link_disable		= intel_ntb_link_disable,
+	.db_is_unsafe		= intel_ntb_db_is_unsafe,
+	.db_valid_mask		= intel_ntb_db_valid_mask,
+	.db_vector_count	= intel_ntb_db_vector_count,
+	.db_vector_mask		= intel_ntb_db_vector_mask,
+	.db_read		= intel_ntb_db_read,
+	.db_clear		= intel_ntb_db_clear,
+	.db_set_mask		= intel_ntb_db_set_mask,
+	.db_clear_mask		= intel_ntb_db_clear_mask,
+	.peer_db_addr		= intel_ntb_peer_db_addr,
+	.peer_db_set		= intel_ntb_peer_db_set,
+	.spad_is_unsafe		= intel_ntb_spad_is_unsafe,
+	.spad_count		= intel_ntb_spad_count,
+	.spad_read		= intel_ntb_spad_read,
+	.spad_write		= intel_ntb_spad_write,
+	.peer_spad_addr		= intel_ntb_peer_spad_addr,
+	.peer_spad_read		= intel_ntb_peer_spad_read,
+	.peer_spad_write	= intel_ntb_peer_spad_write,
+};
+
+static const struct file_operations intel_ntb_debugfs_info = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.read = ndev_debugfs_read,
+};
+
+static const struct pci_device_id intel_ntb_pci_tbl[] = {
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_BWD)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_JSF)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_SNB)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_IVT)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_HSX)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_BDX)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_JSF)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_SNB)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_IVT)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_HSX)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_BDX)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_JSF)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_SNB)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_IVT)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_HSX)},
+	{PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_BDX)},
+	{0}
+};
+MODULE_DEVICE_TABLE(pci, intel_ntb_pci_tbl);
+
+static struct pci_driver intel_ntb_pci_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = intel_ntb_pci_tbl,
+	.probe = intel_ntb_pci_probe,
+	.remove = intel_ntb_pci_remove,
+};
+
+static int __init intel_ntb_pci_driver_init(void)
+{
+	pr_info("%s %s\n", NTB_DESC, NTB_VER);
+
+	if (debugfs_initialized())
+		debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+
+	return pci_register_driver(&intel_ntb_pci_driver);
+}
+module_init(intel_ntb_pci_driver_init);
+
+static void __exit intel_ntb_pci_driver_exit(void)
+{
+	pci_unregister_driver(&intel_ntb_pci_driver);
+
+	debugfs_remove_recursive(debugfs_dir);
+}
+module_exit(intel_ntb_pci_driver_exit);
+
diff --git a/kernel/drivers/ntb/hw/intel/ntb_hw_intel.h b/kernel/drivers/ntb/hw/intel/ntb_hw_intel.h
new file mode 100644
index 000000000..2eb4addd1
--- /dev/null
+++ b/kernel/drivers/ntb/hw/intel/ntb_hw_intel.h
@@ -0,0 +1,340 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ *   redistributing this file, you may do so under either license.
+ *
+ *   GPL LICENSE SUMMARY
+ *
+ *   Copyright(c) 2012 Intel Corporation. All rights reserved.
+ *   Copyright (C) 2015 EMC Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of version 2 of the GNU General Public License as
+ *   published by the Free Software Foundation.
+ *
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2012 Intel Corporation. All rights reserved.
+ *   Copyright (C) 2015 EMC Corporation. All Rights Reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copy
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Intel PCIe NTB Linux driver
+ *
+ * Contact Information:
+ * Jon Mason <jon.mason@intel.com>
+ */
+
+#ifndef NTB_HW_INTEL_H
+#define NTB_HW_INTEL_H
+
+#include <linux/ntb.h>
+#include <linux/pci.h>
+
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_JSF	0x3725
+#define PCI_DEVICE_ID_INTEL_NTB_PS_JSF	0x3726
+#define PCI_DEVICE_ID_INTEL_NTB_SS_JSF	0x3727
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_SNB	0x3C0D
+#define PCI_DEVICE_ID_INTEL_NTB_PS_SNB	0x3C0E
+#define PCI_DEVICE_ID_INTEL_NTB_SS_SNB	0x3C0F
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_IVT	0x0E0D
+#define PCI_DEVICE_ID_INTEL_NTB_PS_IVT	0x0E0E
+#define PCI_DEVICE_ID_INTEL_NTB_SS_IVT	0x0E0F
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_HSX	0x2F0D
+#define PCI_DEVICE_ID_INTEL_NTB_PS_HSX	0x2F0E
+#define PCI_DEVICE_ID_INTEL_NTB_SS_HSX	0x2F0F
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD	0x0C4E
+#define PCI_DEVICE_ID_INTEL_NTB_B2B_BDX	0x6F0D
+#define PCI_DEVICE_ID_INTEL_NTB_PS_BDX	0x6F0E
+#define PCI_DEVICE_ID_INTEL_NTB_SS_BDX	0x6F0F
+
+/* Intel Xeon hardware */
+
+#define XEON_PBAR23LMT_OFFSET		0x0000
+#define XEON_PBAR45LMT_OFFSET		0x0008
+#define XEON_PBAR4LMT_OFFSET		0x0008
+#define XEON_PBAR5LMT_OFFSET		0x000c
+#define XEON_PBAR23XLAT_OFFSET		0x0010
+#define XEON_PBAR45XLAT_OFFSET		0x0018
+#define XEON_PBAR4XLAT_OFFSET		0x0018
+#define XEON_PBAR5XLAT_OFFSET		0x001c
+#define XEON_SBAR23LMT_OFFSET		0x0020
+#define XEON_SBAR45LMT_OFFSET		0x0028
+#define XEON_SBAR4LMT_OFFSET		0x0028
+#define XEON_SBAR5LMT_OFFSET		0x002c
+#define XEON_SBAR23XLAT_OFFSET		0x0030
+#define XEON_SBAR45XLAT_OFFSET		0x0038
+#define XEON_SBAR4XLAT_OFFSET		0x0038
+#define XEON_SBAR5XLAT_OFFSET		0x003c
+#define XEON_SBAR0BASE_OFFSET		0x0040
+#define XEON_SBAR23BASE_OFFSET		0x0048
+#define XEON_SBAR45BASE_OFFSET		0x0050
+#define XEON_SBAR4BASE_OFFSET		0x0050
+#define XEON_SBAR5BASE_OFFSET		0x0054
+#define XEON_SBDF_OFFSET		0x005c
+#define XEON_NTBCNTL_OFFSET		0x0058
+#define XEON_PDOORBELL_OFFSET		0x0060
+#define XEON_PDBMSK_OFFSET		0x0062
+#define XEON_SDOORBELL_OFFSET		0x0064
+#define XEON_SDBMSK_OFFSET		0x0066
+#define XEON_USMEMMISS_OFFSET		0x0070
+#define XEON_SPAD_OFFSET		0x0080
+#define XEON_PBAR23SZ_OFFSET		0x00d0
+#define XEON_PBAR45SZ_OFFSET		0x00d1
+#define XEON_PBAR4SZ_OFFSET		0x00d1
+#define XEON_SBAR23SZ_OFFSET		0x00d2
+#define XEON_SBAR45SZ_OFFSET		0x00d3
+#define XEON_SBAR4SZ_OFFSET		0x00d3
+#define XEON_PPD_OFFSET			0x00d4
+#define XEON_PBAR5SZ_OFFSET		0x00d5
+#define XEON_SBAR5SZ_OFFSET		0x00d6
+#define XEON_WCCNTRL_OFFSET		0x00e0
+#define XEON_UNCERRSTS_OFFSET		0x014c
+#define XEON_CORERRSTS_OFFSET		0x0158
+#define XEON_LINK_STATUS_OFFSET		0x01a2
+#define XEON_SPCICMD_OFFSET		0x0504
+#define XEON_DEVCTRL_OFFSET		0x0598
+#define XEON_DEVSTS_OFFSET		0x059a
+#define XEON_SLINK_STATUS_OFFSET	0x05a2
+#define XEON_B2B_SPAD_OFFSET		0x0100
+#define XEON_B2B_DOORBELL_OFFSET	0x0140
+#define XEON_B2B_XLAT_OFFSETL		0x0144
+#define XEON_B2B_XLAT_OFFSETU		0x0148
+#define XEON_PPD_CONN_MASK		0x03
+#define XEON_PPD_CONN_TRANSPARENT	0x00
+#define XEON_PPD_CONN_B2B		0x01
+#define XEON_PPD_CONN_RP		0x02
+#define XEON_PPD_DEV_MASK		0x10
+#define XEON_PPD_DEV_USD		0x00
+#define XEON_PPD_DEV_DSD		0x10
+#define XEON_PPD_SPLIT_BAR_MASK		0x40
+
+#define XEON_PPD_TOPO_MASK	(XEON_PPD_CONN_MASK | XEON_PPD_DEV_MASK)
+#define XEON_PPD_TOPO_PRI_USD	(XEON_PPD_CONN_RP | XEON_PPD_DEV_USD)
+#define XEON_PPD_TOPO_PRI_DSD	(XEON_PPD_CONN_RP | XEON_PPD_DEV_DSD)
+#define XEON_PPD_TOPO_SEC_USD	(XEON_PPD_CONN_TRANSPARENT | XEON_PPD_DEV_USD)
+#define XEON_PPD_TOPO_SEC_DSD	(XEON_PPD_CONN_TRANSPARENT | XEON_PPD_DEV_DSD)
+#define XEON_PPD_TOPO_B2B_USD	(XEON_PPD_CONN_B2B | XEON_PPD_DEV_USD)
+#define XEON_PPD_TOPO_B2B_DSD	(XEON_PPD_CONN_B2B | XEON_PPD_DEV_DSD)
+
+#define XEON_MW_COUNT			2
+#define HSX_SPLIT_BAR_MW_COUNT		3
+#define XEON_DB_COUNT			15
+#define XEON_DB_LINK			15
+#define XEON_DB_LINK_BIT			BIT_ULL(XEON_DB_LINK)
+#define XEON_DB_MSIX_VECTOR_COUNT	4
+#define XEON_DB_MSIX_VECTOR_SHIFT	5
+#define XEON_DB_TOTAL_SHIFT		16
+#define XEON_SPAD_COUNT			16
+
+/* Intel Atom hardware */
+
+#define ATOM_SBAR2XLAT_OFFSET		0x0008
+#define ATOM_PDOORBELL_OFFSET		0x0020
+#define ATOM_PDBMSK_OFFSET		0x0028
+#define ATOM_NTBCNTL_OFFSET		0x0060
+#define ATOM_SPAD_OFFSET			0x0080
+#define ATOM_PPD_OFFSET			0x00d4
+#define ATOM_PBAR2XLAT_OFFSET		0x8008
+#define ATOM_B2B_DOORBELL_OFFSET		0x8020
+#define ATOM_B2B_SPAD_OFFSET		0x8080
+#define ATOM_SPCICMD_OFFSET		0xb004
+#define ATOM_LINK_STATUS_OFFSET		0xb052
+#define ATOM_ERRCORSTS_OFFSET		0xb110
+#define ATOM_IP_BASE			0xc000
+#define ATOM_DESKEWSTS_OFFSET		(ATOM_IP_BASE + 0x3024)
+#define ATOM_LTSSMERRSTS0_OFFSET		(ATOM_IP_BASE + 0x3180)
+#define ATOM_LTSSMSTATEJMP_OFFSET	(ATOM_IP_BASE + 0x3040)
+#define ATOM_IBSTERRRCRVSTS0_OFFSET	(ATOM_IP_BASE + 0x3324)
+#define ATOM_MODPHY_PCSREG4		0x1c004
+#define ATOM_MODPHY_PCSREG6		0x1c006
+
+#define ATOM_PPD_INIT_LINK		0x0008
+#define ATOM_PPD_CONN_MASK		0x0300
+#define ATOM_PPD_CONN_TRANSPARENT	0x0000
+#define ATOM_PPD_CONN_B2B		0x0100
+#define ATOM_PPD_CONN_RP			0x0200
+#define ATOM_PPD_DEV_MASK		0x1000
+#define ATOM_PPD_DEV_USD			0x0000
+#define ATOM_PPD_DEV_DSD			0x1000
+#define ATOM_PPD_TOPO_MASK	(ATOM_PPD_CONN_MASK | ATOM_PPD_DEV_MASK)
+#define ATOM_PPD_TOPO_PRI_USD	(ATOM_PPD_CONN_TRANSPARENT | ATOM_PPD_DEV_USD)
+#define ATOM_PPD_TOPO_PRI_DSD	(ATOM_PPD_CONN_TRANSPARENT | ATOM_PPD_DEV_DSD)
+#define ATOM_PPD_TOPO_SEC_USD	(ATOM_PPD_CONN_RP | ATOM_PPD_DEV_USD)
+#define ATOM_PPD_TOPO_SEC_DSD	(ATOM_PPD_CONN_RP | ATOM_PPD_DEV_DSD)
+#define ATOM_PPD_TOPO_B2B_USD	(ATOM_PPD_CONN_B2B | ATOM_PPD_DEV_USD)
+#define ATOM_PPD_TOPO_B2B_DSD	(ATOM_PPD_CONN_B2B | ATOM_PPD_DEV_DSD)
+
+#define ATOM_MW_COUNT			2
+#define ATOM_DB_COUNT			34
+#define ATOM_DB_VALID_MASK		(BIT_ULL(ATOM_DB_COUNT) - 1)
+#define ATOM_DB_MSIX_VECTOR_COUNT	34
+#define ATOM_DB_MSIX_VECTOR_SHIFT	1
+#define ATOM_DB_TOTAL_SHIFT		34
+#define ATOM_SPAD_COUNT			16
+
+#define ATOM_NTB_CTL_DOWN_BIT		BIT(16)
+#define ATOM_NTB_CTL_ACTIVE(x)		!(x & ATOM_NTB_CTL_DOWN_BIT)
+
+#define ATOM_DESKEWSTS_DBERR		BIT(15)
+#define ATOM_LTSSMERRSTS0_UNEXPECTEDEI	BIT(20)
+#define ATOM_LTSSMSTATEJMP_FORCEDETECT	BIT(2)
+#define ATOM_IBIST_ERR_OFLOW		0x7FFF7FFF
+
+#define ATOM_LINK_HB_TIMEOUT		msecs_to_jiffies(1000)
+#define ATOM_LINK_RECOVERY_TIME		msecs_to_jiffies(500)
+
+/* Ntb control and link status */
+
+#define NTB_CTL_CFG_LOCK		BIT(0)
+#define NTB_CTL_DISABLE			BIT(1)
+#define NTB_CTL_S2P_BAR2_SNOOP		BIT(2)
+#define NTB_CTL_P2S_BAR2_SNOOP		BIT(4)
+#define NTB_CTL_S2P_BAR4_SNOOP		BIT(6)
+#define NTB_CTL_P2S_BAR4_SNOOP		BIT(8)
+#define NTB_CTL_S2P_BAR5_SNOOP		BIT(12)
+#define NTB_CTL_P2S_BAR5_SNOOP		BIT(14)
+
+#define NTB_LNK_STA_ACTIVE_BIT		0x2000
+#define NTB_LNK_STA_SPEED_MASK		0x000f
+#define NTB_LNK_STA_WIDTH_MASK		0x03f0
+#define NTB_LNK_STA_ACTIVE(x)		(!!((x) & NTB_LNK_STA_ACTIVE_BIT))
+#define NTB_LNK_STA_SPEED(x)		((x) & NTB_LNK_STA_SPEED_MASK)
+#define NTB_LNK_STA_WIDTH(x)		(((x) & NTB_LNK_STA_WIDTH_MASK) >> 4)
+
+/* Use the following addresses for translation between b2b ntb devices in case
+ * the hardware default values are not reliable. */
+#define XEON_B2B_BAR0_ADDR	0x1000000000000000ull
+#define XEON_B2B_BAR2_ADDR64	0x2000000000000000ull
+#define XEON_B2B_BAR4_ADDR64	0x4000000000000000ull
+#define XEON_B2B_BAR4_ADDR32	0x20000000u
+#define XEON_B2B_BAR5_ADDR32	0x40000000u
+
+/* The peer ntb secondary config space is 32KB fixed size */
+#define XEON_B2B_MIN_SIZE		0x8000
+
+/* flags to indicate hardware errata */
+#define NTB_HWERR_SDOORBELL_LOCKUP	BIT_ULL(0)
+#define NTB_HWERR_SB01BASE_LOCKUP	BIT_ULL(1)
+#define NTB_HWERR_B2BDOORBELL_BIT14	BIT_ULL(2)
+
+/* flags to indicate unsafe api */
+#define NTB_UNSAFE_DB			BIT_ULL(0)
+#define NTB_UNSAFE_SPAD			BIT_ULL(1)
+
+struct intel_ntb_dev;
+
+struct intel_ntb_reg {
+	int (*poll_link)(struct intel_ntb_dev *ndev);
+	int (*link_is_up)(struct intel_ntb_dev *ndev);
+	u64 (*db_ioread)(void __iomem *mmio);
+	void (*db_iowrite)(u64 db_bits, void __iomem *mmio);
+	unsigned long			ntb_ctl;
+	resource_size_t			db_size;
+	int				mw_bar[];
+};
+
+struct intel_ntb_alt_reg {
+	unsigned long			db_bell;
+	unsigned long			db_mask;
+	unsigned long			spad;
+};
+
+struct intel_ntb_xlat_reg {
+	unsigned long			bar0_base;
+	unsigned long			bar2_xlat;
+	unsigned long			bar2_limit;
+};
+
+struct intel_b2b_addr {
+	phys_addr_t			bar0_addr;
+	phys_addr_t			bar2_addr64;
+	phys_addr_t			bar4_addr64;
+	phys_addr_t			bar4_addr32;
+	phys_addr_t			bar5_addr32;
+};
+
+struct intel_ntb_vec {
+	struct intel_ntb_dev		*ndev;
+	int				num;
+};
+
+struct intel_ntb_dev {
+	struct ntb_dev			ntb;
+
+	/* offset of peer bar0 in b2b bar */
+	unsigned long			b2b_off;
+	/* mw idx used to access peer bar0 */
+	unsigned int			b2b_idx;
+
+	/* BAR45 is split into BAR4 and BAR5 */
+	bool				bar4_split;
+
+	u32				ntb_ctl;
+	u32				lnk_sta;
+
+	unsigned char			mw_count;
+	unsigned char			spad_count;
+	unsigned char			db_count;
+	unsigned char			db_vec_count;
+	unsigned char			db_vec_shift;
+
+	u64				db_valid_mask;
+	u64				db_link_mask;
+	u64				db_mask;
+
+	/* synchronize rmw access of db_mask and hw reg */
+	spinlock_t			db_mask_lock;
+
+	struct msix_entry		*msix;
+	struct intel_ntb_vec		*vec;
+
+	const struct intel_ntb_reg	*reg;
+	const struct intel_ntb_alt_reg	*self_reg;
+	const struct intel_ntb_alt_reg	*peer_reg;
+	const struct intel_ntb_xlat_reg	*xlat_reg;
+	void				__iomem *self_mmio;
+	void				__iomem *peer_mmio;
+	phys_addr_t			peer_addr;
+
+	unsigned long			last_ts;
+	struct delayed_work		hb_timer;
+
+	unsigned long			hwerr_flags;
+	unsigned long			unsafe_flags;
+	unsigned long			unsafe_flags_ignore;
+
+	struct dentry			*debugfs_dir;
+	struct dentry			*debugfs_info;
+};
+
+#define ndev_pdev(ndev) ((ndev)->ntb.pdev)
+#define ndev_name(ndev) pci_name(ndev_pdev(ndev))
+#define ndev_dev(ndev) (&ndev_pdev(ndev)->dev)
+#define ntb_ndev(ntb) container_of(ntb, struct intel_ntb_dev, ntb)
+#define hb_ndev(work) container_of(work, struct intel_ntb_dev, hb_timer.work)
+
+#endif