Date:   Thu, 30 Sep 2021 18:28:15 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     lee.jones@...aro.org, hdegoede@...hat.com, mgross@...ux.intel.com,
        bhelgaas@...gle.com, gregkh@...uxfoundation.org,
        andriy.shevchenko@...ux.intel.com, srinivas.pandruvada@...el.com
Cc:     "David E. Box" <david.e.box@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH 5/5] platform/x86: Add Intel Software Defined Silicon driver

Intel Software Defined Silicon (SDSi) is a post manufacturing mechanism for
activating additional silicon features. Features are enabled through a
license activation process.  The SDSi driver provides a per socket, ioctl
interface for applications to perform 3 main provisioning functions:

1. Provision an Authentication Key Certificate (AKC), a key written to
   internal NVRAM that is used to authenticate a capability specific
   activation payload.

2. Provision a Capability Activation Payload (CAP), a token authenticated
   using the AKC and applied to the CPU configuration to activate a new
   feature.

3. Read the SDSi State Certificate, containing the CPU configuration
   state.

The ioctl operations perform function specific mailbox commands that
forward the requests to SDSi hardware to perform authentication of the
payloads and enable the silicon configuration (to be made available after
power cycling).

The SDSi device itself is enumerated as an auxiliary device from the
intel_extended_caps driver and as such has a build dependency on
CONFIG_INTEL_EXTENDED_CAPS.

Link: https://github.com/intel/intel-sdsi
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
V1:
	- Converted to auxiliary bus device driver
	- Combined and added groups to miscdev per GKH
	- Added ABI documentation per GKH
	- Dropped the kref for private structure. Instead manage the reference
	  count of the miscdev and use an added devm action to free the
	  structure

 .../ABI/testing/sysfs-driver-intel_sdsi       |  28 +
 MAINTAINERS                                   |   6 +
 drivers/platform/x86/intel/Kconfig            |  12 +
 drivers/platform/x86/intel/Makefile           |   2 +
 drivers/platform/x86/intel/extended_caps.c    |   2 +
 drivers/platform/x86/intel/sdsi.c             | 692 ++++++++++++++++++
 include/uapi/linux/sdsi_if.h                  |  47 ++
 7 files changed, 789 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-intel_sdsi
 create mode 100644 drivers/platform/x86/intel/sdsi.c
 create mode 100644 include/uapi/linux/sdsi_if.h

diff --git a/Documentation/ABI/testing/sysfs-driver-intel_sdsi b/Documentation/ABI/testing/sysfs-driver-intel_sdsi
new file mode 100644
index 000000000000..590d2b1eac7d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-intel_sdsi
@@ -0,0 +1,28 @@
+What:		/sys/class/misc/isdsi-<x>
+Date:		Sep 2021
+KernelVersion:	5.16
+Contact:	"David E. Box" <david.e.box@...ux.intel.com>
+Description:
+		This folder contains files describing information about the
+		Software Defined Silicon miscdevice for a particular socket.
+
+What:		/sys/class/misc/isdsi-<x>/guid
+Date:		Sep 2021
+KernelVersion:	5.16
+Contact:	"David E. Box" <david.e.box@...ux.intel.com>
+Description:
+		(RO) The GUID for the registers file. The GUID identifies
+		the register layout of the registers file in this folder.
+		Information about the register layouts for a particular GUID
+		is available at http://github.com/intel/intel-sdsi
+
+What:		/sys/class/misc/isdsi-<x>/registers
+Date:		Sep 2021
+KernelVersion:	5.16
+Contact:	"David E. Box" <david.e.box@...ux.intel.com>
+Description:
+		(RO) Contains information needed by applications to provision
+		a CPU and monitor status intformation. The layout of this file
+		is determined by the GUID in this folder. Information about the
+		layout for a particular GUID is available at
+		http://github.com/intel/intel-sdsi
diff --git a/MAINTAINERS b/MAINTAINERS
index 4e55a9f33fa3..ddbeade09406 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9614,6 +9614,12 @@ S:	Maintained
 F:	arch/x86/include/asm/intel_scu_ipc.h
 F:	drivers/platform/x86/intel_scu_*
 
+INTEL SDSI DRIVER
+M:	David E. Box <david.e.box@...ux.intel.com>
+S:	Supported
+F:	drivers/platform/x86/intel/sdsi.c
+F:	include/uapi/linux/sdsi_if.h
+
 INTEL SKYLAKE INT3472 ACPI DEVICE DRIVER
 M:	Daniel Scally <djrscally@...il.com>
 S:	Maintained
diff --git a/drivers/platform/x86/intel/Kconfig b/drivers/platform/x86/intel/Kconfig
index d7492372efc3..8562e9626cff 100644
--- a/drivers/platform/x86/intel/Kconfig
+++ b/drivers/platform/x86/intel/Kconfig
@@ -142,6 +142,18 @@ config INTEL_RST
 	  firmware will copy the memory contents back to RAM and resume the OS
 	  as usual.
 
+config INTEL_SDSI
+	tristate "Intel Software Defined Silicon Driver"
+	depends on INTEL_EXTENDED_CAPS
+	depends on X86_64
+	help
+	  This driver enables access to the Intel Software Defined Silicon
+	  interface used to provision silicon features with an authentication
+	  certificate and capability license.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called intel_sdsi.
+
 config INTEL_SMARTCONNECT
 	tristate "Intel Smart Connect disabling driver"
 	depends on ACPI
diff --git a/drivers/platform/x86/intel/Makefile b/drivers/platform/x86/intel/Makefile
index 6f5bee0e1f58..4f34fcf0da7a 100644
--- a/drivers/platform/x86/intel/Makefile
+++ b/drivers/platform/x86/intel/Makefile
@@ -27,6 +27,8 @@ intel_int0002_vgpio-y			:= int0002_vgpio.o
 obj-$(CONFIG_INTEL_INT0002_VGPIO)	+= intel_int0002_vgpio.o
 intel_oaktrail-y			:= oaktrail.o
 obj-$(CONFIG_INTEL_OAKTRAIL)		+= intel_oaktrail.o
+intel_sdsi-y				:= sdsi.o
+obj-$(CONFIG_INTEL_SDSI)		+= intel_sdsi.o
 
 # Intel PMIC / PMC / P-Unit drivers
 intel_bxtwc_tmu-y			:= bxtwc_tmu.o
diff --git a/drivers/platform/x86/intel/extended_caps.c b/drivers/platform/x86/intel/extended_caps.c
index eca47d693b14..b04f7019f744 100644
--- a/drivers/platform/x86/intel/extended_caps.c
+++ b/drivers/platform/x86/intel/extended_caps.c
@@ -31,6 +31,7 @@
 #define EXTENDED_CAP_ID_TELEMETRY	2
 #define EXTENDED_CAP_ID_WATCHER		3
 #define EXTENDED_CAP_ID_CRASHLOG	4
+#define EXTENDED_CAP_ID_SDSI		65
 
 static DEFINE_IDA(extended_caps_ida);
 
@@ -38,6 +39,7 @@ static int extended_caps_allow_list[] = {
 	EXTENDED_CAP_ID_TELEMETRY,
 	EXTENDED_CAP_ID_WATCHER,
 	EXTENDED_CAP_ID_CRASHLOG,
+	EXTENDED_CAP_ID_SDSI,
 };
 
 struct extended_caps_platform_info {
diff --git a/drivers/platform/x86/intel/sdsi.c b/drivers/platform/x86/intel/sdsi.c
new file mode 100644
index 000000000000..a1298549e8be
--- /dev/null
+++ b/drivers/platform/x86/intel/sdsi.c
@@ -0,0 +1,692 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Software Defined Silicon driver
+ *
+ * Copyright (c) 2021, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * Author: "David E. Box" <david.e.box@...ux.intel.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+#include <uapi/linux/sdsi_if.h>
+
+#include "extended_caps.h"
+
+#define ACCESS_TYPE_BARID		2
+#define ACCESS_TYPE_LOCAL		3
+
+#define SDSI_MIN_SIZE_DWORDS		276
+#define SDSI_SIZE_CONTROL		8
+#define SDSI_SIZE_MAILBOX		1024
+#define SDSI_SIZE_REGS			72
+#define SDSI_SIZE_CMD			sizeof(u64)
+
+/*
+ * Write messages are currently up to the size of the mailbox
+ * while read messages are up to 4 times the size of the
+ * mailbox, sent in packets
+ */
+#define SDSI_SIZE_WRITE_MSG		SDSI_SIZE_MAILBOX
+#define SDSI_SIZE_READ_MSG		(SDSI_SIZE_MAILBOX * 4)
+
+#define SDSI_ENABLED_FEATURES_OFFSET	16
+#define SDSI_ENABLED			BIT(3)
+#define SDSI_SOCKET_ID_OFFSET		64
+#define SDSI_SOCKET_ID			GENMASK(3, 0)
+
+#define SDSI_MBOX_CMD_SUCCESS		0x40
+#define SDSI_MBOX_CMD_TIMEOUT		0x80
+
+#define MBOX_TIMEOUT_US			2000
+#define MBOX_TIMEOUT_ACQUIRE_US		1000
+#define MBOX_POLLING_PERIOD_US		100
+#define MBOX_MAX_PACKETS		4
+
+#define MBOX_OWNER_NONE			0x00
+#define MBOX_OWNER_INBAND		0x01
+
+#define CTRL_RUN_BUSY			BIT(0)
+#define CTRL_READ_WRITE			BIT(1)
+#define CTRL_SOM			BIT(2)
+#define CTRL_EOM			BIT(3)
+#define CTRL_OWNER			GENMASK(5, 4)
+#define CTRL_COMPLETE			BIT(6)
+#define CTRL_READY			BIT(7)
+#define CTRL_STATUS			GENMASK(15, 8)
+#define CTRL_PACKET_SIZE		GENMASK(31, 16)
+#define CTRL_MSG_SIZE			GENMASK(63, 48)
+
+#define DISC_TABLE_SIZE			12
+#define DT_ACCESS_TYPE			GENMASK(3, 0)
+#define DT_SIZE				GENMASK(19, 12)
+#define DT_TBIR				GENMASK(2, 0)
+#define DT_OFFSET(v)			((v) & GENMASK(31, 3))
+
+enum sdsi_command {
+	SDSI_CMD_PROVISION_AKC		= 0x04,
+	SDSI_CMD_PROVISION_CAP		= 0x08,
+	SDSI_CMD_READ_STATE		= 0x10,
+};
+
+struct sdsi_mbox_info {
+	u64	*payload;
+	u64	*buffer;
+	int	size;
+	bool	is_write;
+};
+
+struct disc_table {
+	u32	access_info;
+	u32	guid;
+	u32	offset;
+};
+
+struct sdsi_priv {
+	struct mutex		mb_lock;
+	struct mutex		akc_lock;
+	struct miscdevice	miscdev;
+	struct file		*akc_owner;
+	void __iomem		*control_addr;
+	void __iomem		*mbox_addr;
+	void __iomem		*regs_addr;
+	u32			guid;
+	int			socket_id;
+	bool			sdsi_enabled;
+	bool			dev_present;
+};
+
+static __always_inline void
+sdsi_qword_memcpy_toio(u64 __iomem *to, const u64 *from, size_t count_bytes)
+{
+	size_t count = count_bytes / sizeof(*to);
+	int i;
+
+	for (i = 0; i < count; i++)
+		writeq(from[i], &to[i]);
+}
+
+static __always_inline void
+sdsi_qword_memcpy_fromio(u64 *to, const u64 __iomem *from, size_t count_bytes)
+{
+	size_t count = count_bytes / sizeof(*to);
+	int i;
+
+	for (i = 0; i < count; i++)
+		to[i] = readq(&from[i]);
+}
+
+static inline struct sdsi_priv *to_sdsi_priv(struct miscdevice *miscdev)
+{
+	return container_of(miscdev, struct sdsi_priv, miscdev);
+}
+
+static inline void sdsi_complete_transaction(struct sdsi_priv *priv)
+{
+	u64 control = FIELD_PREP(CTRL_COMPLETE, 1);
+
+	lockdep_assert_held(&priv->mb_lock);
+	writeq(control, priv->control_addr);
+}
+
+static int sdsi_status_to_errno(u32 status)
+{
+	switch (status) {
+	case SDSI_MBOX_CMD_SUCCESS:
+		return 0;
+	case SDSI_MBOX_CMD_TIMEOUT:
+		return -ETIMEDOUT;
+	default:
+		return -EIO;
+	}
+}
+
+static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *info, int *data_size)
+{
+	struct device *dev = priv->miscdev.this_device;
+	u32 total, loop, eom, status, message_size;
+	u64 control;
+	int ret;
+
+	lockdep_assert_held(&priv->mb_lock);
+
+	/* Format and send the read command */
+	control = FIELD_PREP(CTRL_EOM, 1) |
+		  FIELD_PREP(CTRL_SOM, 1) |
+		  FIELD_PREP(CTRL_RUN_BUSY, 1) |
+		  FIELD_PREP(CTRL_PACKET_SIZE, info->size);
+	writeq(control, priv->control_addr);
+
+	/* For reads, data sizes that are larger than the mailbox size are read in packets. */
+	total = 0;
+	loop = 0;
+	do {
+		int offset = SDSI_SIZE_MAILBOX * loop;
+		void __iomem *addr = priv->mbox_addr + offset;
+		u64 *buf = info->buffer + (offset / SDSI_SIZE_CMD);
+		u32 packet_size;
+
+		/* Poll on ready bit */
+		ret = readq_poll_timeout(priv->control_addr, control, control & CTRL_READY,
+					 MBOX_POLLING_PERIOD_US, MBOX_TIMEOUT_US);
+		if (ret)
+			break;
+
+		eom = FIELD_GET(CTRL_EOM, control);
+		status = FIELD_GET(CTRL_STATUS, control);
+		packet_size = FIELD_GET(CTRL_PACKET_SIZE, control);
+		message_size = FIELD_GET(CTRL_MSG_SIZE, control);
+
+		ret = sdsi_status_to_errno(status);
+		if (ret)
+			break;
+
+		/* Only the last packet can be less than the mailbox size. */
+		if (!eom && packet_size != SDSI_SIZE_MAILBOX) {
+			dev_err(dev, "Invalid packet size\n");
+			ret = -EPROTO;
+			break;
+		}
+
+		if (packet_size > SDSI_SIZE_MAILBOX) {
+			dev_err(dev, "Packet size to large\n");
+			ret = -EPROTO;
+			break;
+		}
+
+		sdsi_qword_memcpy_fromio(buf, addr, round_up(packet_size, SDSI_SIZE_CMD));
+
+		total += packet_size;
+
+		sdsi_complete_transaction(priv);
+	} while (!eom && ++loop < MBOX_MAX_PACKETS);
+
+	if (ret) {
+		sdsi_complete_transaction(priv);
+		return ret;
+	}
+
+	if (!eom) {
+		dev_err(dev, "Exceeded read attempts\n");
+		return -EPROTO;
+	}
+
+	/* Message size check is only valid for multi-packet transfers */
+	if (loop && total != message_size)
+		dev_warn(dev, "Read count %d differs from expected count %d\n",
+			 total, message_size);
+
+	*data_size = total;
+
+	return 0;
+}
+
+static int sdsi_mbox_cmd_write(struct sdsi_priv *priv, struct sdsi_mbox_info *info)
+{
+	u64 control;
+	u32 status;
+	int ret;
+
+	lockdep_assert_held(&priv->mb_lock);
+
+	/* Write rest of the payload */
+	sdsi_qword_memcpy_toio(priv->mbox_addr + SDSI_SIZE_CMD, info->payload + 1,
+			       info->size - SDSI_SIZE_CMD);
+
+	/* Format and send the write command */
+	control = FIELD_PREP(CTRL_EOM, 1) |
+		  FIELD_PREP(CTRL_SOM, 1) |
+		  FIELD_PREP(CTRL_RUN_BUSY, 1) |
+		  FIELD_PREP(CTRL_READ_WRITE, 1) |
+		  FIELD_PREP(CTRL_PACKET_SIZE, info->size);
+	writeq(control, priv->control_addr);
+
+	/* Poll on run_busy bit */
+	ret = readq_poll_timeout(priv->control_addr, control, !(control & CTRL_RUN_BUSY),
+				 MBOX_POLLING_PERIOD_US, MBOX_TIMEOUT_US);
+
+	if (ret)
+		goto release_mbox;
+
+	status = FIELD_GET(CTRL_STATUS, control);
+	ret = sdsi_status_to_errno(status);
+
+release_mbox:
+	sdsi_complete_transaction(priv);
+
+	return ret;
+}
+
+static int sdsi_mbox_cmd(struct sdsi_priv *priv, struct sdsi_mbox_info *info, int *data_size)
+{
+	u64 control;
+	int ret = 0;
+	u32 owner;
+
+	lockdep_assert_held(&priv->mb_lock);
+
+	/* Check mailbox is available */
+	control = readq(priv->control_addr);
+	owner = FIELD_GET(CTRL_OWNER, control);
+	if (owner != MBOX_OWNER_NONE)
+		return -EBUSY;
+
+	/* Write first qword of payload */
+	writeq(info->payload[0], priv->mbox_addr);
+
+	/* Check for ownership */
+	ret = readq_poll_timeout(priv->control_addr, control,
+				 FIELD_GET(CTRL_OWNER, control) & MBOX_OWNER_INBAND,
+				 MBOX_POLLING_PERIOD_US, MBOX_TIMEOUT_ACQUIRE_US);
+	if (ret)
+		return ret;
+
+	if (info->is_write)
+		ret = sdsi_mbox_cmd_write(priv, info);
+	else
+		ret = sdsi_mbox_cmd_read(priv, info, data_size);
+
+	return ret;
+}
+
+static long sdsi_if_provision(struct sdsi_priv *priv, void __user *argp, enum sdsi_command cmd)
+{
+	struct sdsi_mbox_info info;
+	u32 __user *datap = argp;
+	u32 data_size;
+	int ret;
+
+	if (get_user(data_size, datap))
+		return -EFAULT;
+
+	if (data_size > (SDSI_SIZE_WRITE_MSG - SDSI_SIZE_CMD))
+		return -EOVERFLOW;
+
+	/* Qword aligned message + command qword */
+	info.size = round_up(data_size, SDSI_SIZE_CMD) + SDSI_SIZE_CMD;
+	info.is_write = true;
+
+	info.payload = kzalloc(info.size, GFP_KERNEL);
+	if (!info.payload)
+		return -ENOMEM;
+
+	/* Copy message to payload buffer */
+	if (copy_from_user(info.payload, argp + sizeof(data_size), data_size)) {
+		ret = -EFAULT;
+		goto free_payload;
+	}
+
+	/* Command is last qword of payload buffer */
+	info.payload[(info.size - SDSI_SIZE_CMD) / SDSI_SIZE_CMD] = cmd;
+
+	ret = mutex_lock_interruptible(&priv->mb_lock);
+	if (ret)
+		goto free_payload;
+	ret = sdsi_mbox_cmd(priv, &info, NULL);
+	mutex_unlock(&priv->mb_lock);
+
+free_payload:
+	kfree(info.payload);
+
+	return (ret < 0) ? ret : 0;
+}
+
+static long sdsi_if_read_state_cert(struct sdsi_priv *priv, void __user *argp)
+{
+	u64 command = SDSI_CMD_READ_STATE;
+	struct sdsi_mbox_info info;
+	u32 __user *datap = argp;
+	u32 data_size;
+	int ret;
+
+	/* Buffer for return data */
+	info.buffer = kmalloc(SDSI_SIZE_READ_MSG, GFP_KERNEL);
+	if (!info.buffer)
+		return -ENOMEM;
+
+	info.payload = &command;
+	info.size = sizeof(command);
+	info.is_write = false;
+
+	ret = mutex_lock_interruptible(&priv->mb_lock);
+	if (ret)
+		goto free_buffer;
+	ret = sdsi_mbox_cmd(priv, &info, &data_size);
+	mutex_unlock(&priv->mb_lock);
+	if (ret < 0)
+		goto free_buffer;
+
+	/* First field is the size of the data */
+	if (put_user(data_size, datap)) {
+		ret = -EFAULT;
+		goto free_buffer;
+	}
+
+	/* Copy the data */
+	if (copy_to_user(argp + sizeof(data_size), info.buffer, data_size)) {
+		ret = -EFAULT;
+		goto free_buffer;
+	}
+
+free_buffer:
+	kfree(info.buffer);
+
+	return (ret < 0) ? ret : 0;
+}
+
+static long sdsi_device_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct miscdevice *miscdev = file->private_data;
+	struct sdsi_priv *priv = to_sdsi_priv(miscdev);
+	void __user *argp = (void __user *)arg;
+	long ret = -EINVAL;
+
+	if (!priv->dev_present)
+		return -ENODEV;
+
+	if (!priv->sdsi_enabled)
+		return -EPERM;
+
+	if (cmd == SDSI_IF_READ_STATE)
+		return sdsi_if_read_state_cert(priv, argp);
+
+	mutex_lock(&priv->akc_lock);
+	switch (cmd) {
+	case SDSI_IF_PROVISION_AKC:
+		/*
+		 * While writing an authentication certificate disallow other openers
+		 * from using AKC or CAP.
+		 */
+		if (!priv->akc_owner)
+			priv->akc_owner = file;
+
+		if (priv->akc_owner != file) {
+			ret = -EUSERS;
+			goto unlock_akc;
+		}
+
+		ret = sdsi_if_provision(priv, argp, SDSI_CMD_PROVISION_AKC);
+		break;
+
+	case SDSI_IF_PROVISION_CAP:
+		if (priv->akc_owner && priv->akc_owner != file) {
+			ret = -EUSERS;
+			goto unlock_akc;
+		}
+
+		ret = sdsi_if_provision(priv, argp, SDSI_CMD_PROVISION_CAP);
+		break;
+
+	default:
+		break;
+	}
+
+unlock_akc:
+	mutex_unlock(&priv->akc_lock);
+
+	return ret;
+}
+
+static ssize_t sdsi_read_registers(struct file *filp, struct kobject *kobj,
+				   struct bin_attribute *attr, char *buf, loff_t off,
+				   size_t count)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct miscdevice *miscdev = dev_get_drvdata(dev);
+	struct sdsi_priv *priv = to_sdsi_priv(miscdev);
+	void __iomem *addr = priv->regs_addr;
+
+	if (!priv->dev_present)
+		return -ENODEV;
+
+	memcpy_fromio(buf, addr + off, count);
+
+	return count;
+}
+static BIN_ATTR(registers, 0400, sdsi_read_registers, NULL, SDSI_SIZE_REGS);
+
+static struct bin_attribute *sdsi_bin_attrs[] = {
+	&bin_attr_registers,
+	NULL,
+};
+
+static ssize_t guid_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct miscdevice *miscdev = dev_get_drvdata(dev);
+	struct sdsi_priv *priv = to_sdsi_priv(miscdev);
+
+	return sprintf(buf, "0x%x\n", priv->guid);
+}
+static DEVICE_ATTR_RO(guid);
+
+static struct attribute *sdsi_attrs[] = {
+	&dev_attr_guid.attr,
+	NULL
+};
+
+static const struct attribute_group sdsi_group = {
+	.attrs = sdsi_attrs,
+	.bin_attrs = sdsi_bin_attrs,
+};
+__ATTRIBUTE_GROUPS(sdsi);
+
+static int sdsi_device_open(struct inode *inode, struct file *file)
+{
+	struct miscdevice *miscdev = file->private_data;
+
+	get_device(miscdev->this_device);
+
+	return 0;
+}
+
+static int sdsi_device_release(struct inode *inode, struct file *file)
+{
+
+	struct miscdevice *miscdev = file->private_data;
+	struct sdsi_priv *priv = to_sdsi_priv(miscdev);
+
+	if (priv->akc_owner == file)
+		priv->akc_owner = NULL;
+
+	put_device(miscdev->this_device);
+
+	return 0;
+}
+
+static const struct file_operations sdsi_char_device_ops = {
+	.owner = THIS_MODULE,
+	.open = sdsi_device_open,
+	.unlocked_ioctl = sdsi_device_ioctl,
+	.release = sdsi_device_release,
+};
+
+static int sdsi_create_misc_device(struct sdsi_priv *priv, struct device *parent)
+{
+	int ret;
+
+	priv->miscdev.name = kasprintf(GFP_KERNEL, "isdsi-%d", priv->socket_id);
+	if (!priv->miscdev.name)
+		return -ENOMEM;
+
+	priv->miscdev.minor = MISC_DYNAMIC_MINOR;
+	priv->miscdev.fops = &sdsi_char_device_ops;
+	priv->miscdev.groups = sdsi_groups;
+	priv->miscdev.parent = parent;
+
+	ret = misc_register(&priv->miscdev);
+	if (ret)
+		kfree(priv->miscdev.name);
+
+	return ret;
+}
+
+static int sdsi_map_sdsi_registers(struct device *dev, struct disc_table *disc_table,
+				   struct resource *disc_res, struct pci_dev *pci_dev)
+{
+	struct sdsi_priv *priv = dev_get_drvdata(dev);
+	u32 access_type = FIELD_GET(DT_ACCESS_TYPE, disc_table->access_info);
+	u32 size = FIELD_GET(DT_SIZE, disc_table->access_info);
+	u32 tbir = FIELD_GET(DT_TBIR, disc_table->offset);
+	u32 offset = DT_OFFSET(disc_table->offset);
+	struct resource res = {};
+
+	/* Starting location of SDSi MMIO region based on access type */
+	switch (access_type) {
+	case ACCESS_TYPE_LOCAL:
+		if (tbir) {
+			dev_err(dev,
+				"Unsupported BAR index %d for access type %d\n",
+				tbir, access_type);
+			return -EINVAL;
+		}
+
+		/*
+		 * For access_type LOCAL, the base address is as follows:
+		 * base address = end of discovery region + base offset + 1
+		 */
+		res.start = disc_res->end + offset + 1;
+		break;
+
+	case ACCESS_TYPE_BARID:
+		res.start = pci_resource_start(pci_dev, tbir) + offset;
+		break;
+
+	default:
+		dev_err(dev, "Unrecognized access_type %d\n", access_type);
+		return -EINVAL;
+	}
+
+	res.end = res.start + size * sizeof(u32) - 1;
+	res.flags = IORESOURCE_MEM;
+
+	priv->control_addr = devm_ioremap_resource(dev, &res);
+	if (IS_ERR(priv->control_addr))
+		return PTR_ERR(priv->control_addr);
+
+	priv->mbox_addr = priv->control_addr + SDSI_SIZE_CONTROL;
+	priv->regs_addr = priv->mbox_addr + SDSI_SIZE_MAILBOX;
+
+	priv->socket_id = readl(priv->regs_addr + SDSI_SOCKET_ID_OFFSET) &
+				SDSI_SOCKET_ID;
+
+	priv->sdsi_enabled = !!(readq(priv->regs_addr + SDSI_ENABLED_FEATURES_OFFSET) &
+				SDSI_ENABLED);
+	return 0;
+}
+
+static void sdsi_miscdev_remove(void *data)
+{
+	struct sdsi_priv *priv = data;
+
+	kfree(priv->miscdev.name);
+	kfree(priv);
+	priv = NULL;
+}
+
+static int sdsi_probe(struct auxiliary_device *adev, const struct auxiliary_device_id *id)
+{
+	struct intel_extended_cap_device *intel_cap_dev =
+			container_of(adev, struct intel_extended_cap_device, aux_dev);
+	struct disc_table disc_table;
+	struct resource *disc_res;
+	void __iomem *disc_addr;
+	struct sdsi_priv *priv;
+	int ret;
+
+	/* Get the SDSi discovery table */
+	disc_res = intel_ext_cap_get_resource(intel_cap_dev, 0);
+	if (!disc_res)
+		return -ENODEV;
+
+	disc_addr = devm_ioremap_resource(&adev->dev, disc_res);
+	if (IS_ERR(disc_addr))
+		return PTR_ERR(disc_addr);
+
+	memcpy_fromio(&disc_table, disc_addr, DISC_TABLE_SIZE);
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	dev_set_drvdata(&adev->dev, priv);
+
+	priv->guid = disc_table.guid;
+
+	/* Map the SDSi mailbox registers */
+	ret = sdsi_map_sdsi_registers(&adev->dev, &disc_table, disc_res, intel_cap_dev->pcidev);
+	if (ret) {
+		kfree(priv);
+		return ret;
+	}
+
+	ret = sdsi_create_misc_device(priv, &adev->dev);
+	if (ret) {
+		kfree(priv);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(priv->miscdev.this_device, sdsi_miscdev_remove, priv);
+	if (ret)
+		goto deregister_misc;
+
+	mutex_init(&priv->mb_lock);
+	mutex_init(&priv->akc_lock);
+	priv->dev_present = true;
+
+	return 0;
+
+deregister_misc:
+	misc_deregister(&priv->miscdev);
+
+	return ret;
+}
+
+static void sdsi_remove(struct auxiliary_device *adev)
+{
+	struct sdsi_priv *priv = dev_get_drvdata(&adev->dev);
+
+	priv->dev_present = false;
+	misc_deregister(&priv->miscdev);
+}
+
+static const struct auxiliary_device_id sdsi_aux_id_table[] = {
+	{ .name = "intel_extended_caps.65", },
+	{},
+};
+MODULE_DEVICE_TABLE(auxiliary, sdsi_aux_id_table);
+
+static struct auxiliary_driver sdsi_aux_driver = {
+	.id_table	= sdsi_aux_id_table,
+	.remove		= sdsi_remove,
+	.probe		= sdsi_probe,
+};
+
+static int __init sdsi_aux_init(void)
+{
+	return auxiliary_driver_register(&sdsi_aux_driver);
+}
+module_init(sdsi_aux_init);
+
+static void __exit sdsi_aux_exit(void)
+{
+	auxiliary_driver_unregister(&sdsi_aux_driver);
+}
+module_exit(sdsi_aux_exit);
+
+MODULE_AUTHOR("David E. Box <david.e.box@...ux.intel.com>");
+MODULE_DESCRIPTION("Intel Software Defined Silicon driver");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(INTEL_EXT_CAPS);
diff --git a/include/uapi/linux/sdsi_if.h b/include/uapi/linux/sdsi_if.h
new file mode 100644
index 000000000000..e56fc49fabaf
--- /dev/null
+++ b/include/uapi/linux/sdsi_if.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Intel Software Defined Silicon: OS to hardware Interface
+ * Copyright (c) 2021, Intel Corporation.
+ * All rights reserved.
+ *
+ * Author: "David E. Box" <david.e.box@...ux.intel.com>
+ */
+
+#ifndef __SDSI_IF_H
+#define __SDSI_IF_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/**
+ * struct sdsi_if_sdsi_state - Read current SDSi State Certificate
+ * @size:	size of the certificate
+ * @data:	SDSi State Certificate
+ *
+ * Used to return output of ioctl SDSI_IF_READ_STATE. This command is used to
+ * read the current CPU configuration state
+ */
+struct sdsi_if_sdsi_state {
+	__u32	size;
+	__u8	data[4096];
+};
+
+/**
+ * struct sdsi_if_provision_payload - Provision a certificate or activation payload
+ * @size:	size of the certificate of activation payload
+ * @data:	certificate or activation payload
+ *
+ * Used with ioctl command SDSI_IF_IOW_PROVISION_AKC and
+ * SDSI_IF_IOW_PROVISION_CAP to provision a CPU with an Authentication
+ * Key Certificate or Capability Activation Payload respectively.
+ */
+struct sdsi_if_provision_payload {
+	__u32	size;
+	__u8	data[4096];
+};
+
+#define SDSI_IF_MAGIC		0xDF
+#define SDSI_IF_READ_STATE	_IOR(SDSI_IF_MAGIC, 0, struct sdsi_if_sdsi_state *)
+#define SDSI_IF_PROVISION_AKC	_IOW(SDSI_IF_MAGIC, 1, struct sdsi_if_provision_payload *)
+#define SDSI_IF_PROVISION_CAP	_IOW(SDSI_IF_MAGIC, 2, struct sdsi_if_provision_payload *)
+#endif
-- 
2.25.1

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