14 files changed, 1791 insertions, 999 deletions

diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
index 6b86f1e6d634..db362fe472ea 100644
--- a/drivers/crypto/ccp/Makefile
+++ b/drivers/crypto/ccp/Makefile
@@ -8,7 +8,9 @@ ccp-$(CONFIG_CRYPTO_DEV_SP_CCP) += ccp-dev.o \
 	    ccp-dmaengine.o
 ccp-$(CONFIG_CRYPTO_DEV_CCP_DEBUGFS) += ccp-debugfs.o
 ccp-$(CONFIG_PCI) += sp-pci.o
-ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o
+ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o \
+                                   sev-dev.o \
+                                   tee-dev.o
 
 obj-$(CONFIG_CRYPTO_DEV_CCP_CRYPTO) += ccp-crypto.o
 ccp-crypto-objs := ccp-crypto-main.o \
diff --git a/drivers/crypto/ccp/ccp-crypto-aes-cmac.c b/drivers/crypto/ccp/ccp-crypto-aes-cmac.c
index 32f19f402073..5eba7ee49e81 100644
--- a/drivers/crypto/ccp/ccp-crypto-aes-cmac.c
+++ b/drivers/crypto/ccp/ccp-crypto-aes-cmac.c
@@ -276,7 +276,6 @@ static int ccp_aes_cmac_setkey(struct crypto_ahash *tfm, const u8 *key,
 		ctx->u.aes.type = CCP_AES_TYPE_256;
 		break;
 	default:
-		crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 	ctx->u.aes.mode = alg->mode;
diff --git a/drivers/crypto/ccp/ccp-crypto-aes-galois.c b/drivers/crypto/ccp/ccp-crypto-aes-galois.c
index ff50ee80d223..9e8f07c1afac 100644
--- a/drivers/crypto/ccp/ccp-crypto-aes-galois.c
+++ b/drivers/crypto/ccp/ccp-crypto-aes-galois.c
@@ -42,7 +42,6 @@ static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
 		ctx->u.aes.type = CCP_AES_TYPE_256;
 		break;
 	default:
-		crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 
diff --git a/drivers/crypto/ccp/ccp-crypto-aes.c b/drivers/crypto/ccp/ccp-crypto-aes.c
index 33328a153225..51e12fbd1159 100644
--- a/drivers/crypto/ccp/ccp-crypto-aes.c
+++ b/drivers/crypto/ccp/ccp-crypto-aes.c
@@ -51,7 +51,6 @@ static int ccp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 		ctx->u.aes.type = CCP_AES_TYPE_256;
 		break;
 	default:
-		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 	ctx->u.aes.mode = alg->mode;
diff --git a/drivers/crypto/ccp/ccp-crypto-sha.c b/drivers/crypto/ccp/ccp-crypto-sha.c
index 453b9797f93f..474e6f1a6a84 100644
--- a/drivers/crypto/ccp/ccp-crypto-sha.c
+++ b/drivers/crypto/ccp/ccp-crypto-sha.c
@@ -293,10 +293,8 @@ static int ccp_sha_setkey(struct crypto_ahash *tfm, const u8 *key,
 
 		ret = crypto_shash_digest(sdesc, key, key_len,
 					  ctx->u.sha.key);
-		if (ret) {
-			crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		if (ret)
 			return -EINVAL;
-		}
 
 		key_len = digest_size;
 	} else {
diff --git a/drivers/crypto/ccp/ccp-dev-v3.c b/drivers/crypto/ccp/ccp-dev-v3.c
index 0186b3df4c87..0d5576f6ad21 100644
--- a/drivers/crypto/ccp/ccp-dev-v3.c
+++ b/drivers/crypto/ccp/ccp-dev-v3.c
@@ -586,6 +586,7 @@ const struct ccp_vdata ccpv3_platform = {
 	.setup = NULL,
 	.perform = &ccp3_actions,
 	.offset = 0,
+	.rsamax = CCP_RSA_MAX_WIDTH,
 };
 
 const struct ccp_vdata ccpv3 = {
diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 7ca2d3408e7a..e95e7aa5dbf1 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -2,57 +2,20 @@
 /*
  * AMD Platform Security Processor (PSP) interface
  *
- * Copyright (C) 2016,2018 Advanced Micro Devices, Inc.
+ * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
  *
  * Author: Brijesh Singh <brijesh.singh@amd.com>
  */
 
-#include <linux/module.h>
 #include <linux/kernel.h>
-#include <linux/kthread.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/spinlock_types.h>
-#include <linux/types.h>
-#include <linux/mutex.h>
-#include <linux/delay.h>
-#include <linux/hw_random.h>
-#include <linux/ccp.h>
-#include <linux/firmware.h>
-
-#include <asm/smp.h>
+#include <linux/irqreturn.h>
 
 #include "sp-dev.h"
 #include "psp-dev.h"
+#include "sev-dev.h"
+#include "tee-dev.h"
 
-#define DEVICE_NAME		"sev"
-#define SEV_FW_FILE		"amd/sev.fw"
-#define SEV_FW_NAME_SIZE	64
-
-static DEFINE_MUTEX(sev_cmd_mutex);
-static struct sev_misc_dev *misc_dev;
-static struct psp_device *psp_master;
-
-static int psp_cmd_timeout = 100;
-module_param(psp_cmd_timeout, int, 0644);
-MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
-
-static int psp_probe_timeout = 5;
-module_param(psp_probe_timeout, int, 0644);
-MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
-
-static bool psp_dead;
-static int psp_timeout;
-
-static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
-{
-	if (psp_master->api_major > maj)
-		return true;
-	if (psp_master->api_major == maj && psp_master->api_minor >= min)
-		return true;
-	return false;
-}
+struct psp_device *psp_master;
 
 static struct psp_device *psp_alloc_struct(struct sp_device *sp)
 {
@@ -75,902 +38,95 @@ static irqreturn_t psp_irq_handler(int irq, void *data)
 {
 	struct psp_device *psp = data;
 	unsigned int status;
-	int reg;
 
 	/* Read the interrupt status: */
 	status = ioread32(psp->io_regs + psp->vdata->intsts_reg);
 
-	/* Check if it is command completion: */
-	if (!(status & PSP_CMD_COMPLETE))
-		goto done;
+	/* invoke subdevice interrupt handlers */
+	if (status) {
+		if (psp->sev_irq_handler)
+			psp->sev_irq_handler(irq, psp->sev_irq_data, status);
 
-	/* Check if it is SEV command completion: */
-	reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
-	if (reg & PSP_CMDRESP_RESP) {
-		psp->sev_int_rcvd = 1;
-		wake_up(&psp->sev_int_queue);
+		if (psp->tee_irq_handler)
+			psp->tee_irq_handler(irq, psp->tee_irq_data, status);
 	}
 
-done:
 	/* Clear the interrupt status by writing the same value we read. */
 	iowrite32(status, psp->io_regs + psp->vdata->intsts_reg);
 
 	return IRQ_HANDLED;
 }
 
-static int sev_wait_cmd_ioc(struct psp_device *psp,
-			    unsigned int *reg, unsigned int timeout)
-{
-	int ret;
-
-	ret = wait_event_timeout(psp->sev_int_queue,
-			psp->sev_int_rcvd, timeout * HZ);
-	if (!ret)
-		return -ETIMEDOUT;
-
-	*reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
-
-	return 0;
-}
-
-static int sev_cmd_buffer_len(int cmd)
-{
-	switch (cmd) {
-	case SEV_CMD_INIT:			return sizeof(struct sev_data_init);
-	case SEV_CMD_PLATFORM_STATUS:		return sizeof(struct sev_user_data_status);
-	case SEV_CMD_PEK_CSR:			return sizeof(struct sev_data_pek_csr);
-	case SEV_CMD_PEK_CERT_IMPORT:		return sizeof(struct sev_data_pek_cert_import);
-	case SEV_CMD_PDH_CERT_EXPORT:		return sizeof(struct sev_data_pdh_cert_export);
-	case SEV_CMD_LAUNCH_START:		return sizeof(struct sev_data_launch_start);
-	case SEV_CMD_LAUNCH_UPDATE_DATA:	return sizeof(struct sev_data_launch_update_data);
-	case SEV_CMD_LAUNCH_UPDATE_VMSA:	return sizeof(struct sev_data_launch_update_vmsa);
-	case SEV_CMD_LAUNCH_FINISH:		return sizeof(struct sev_data_launch_finish);
-	case SEV_CMD_LAUNCH_MEASURE:		return sizeof(struct sev_data_launch_measure);
-	case SEV_CMD_ACTIVATE:			return sizeof(struct sev_data_activate);
-	case SEV_CMD_DEACTIVATE:		return sizeof(struct sev_data_deactivate);
-	case SEV_CMD_DECOMMISSION:		return sizeof(struct sev_data_decommission);
-	case SEV_CMD_GUEST_STATUS:		return sizeof(struct sev_data_guest_status);
-	case SEV_CMD_DBG_DECRYPT:		return sizeof(struct sev_data_dbg);
-	case SEV_CMD_DBG_ENCRYPT:		return sizeof(struct sev_data_dbg);
-	case SEV_CMD_SEND_START:		return sizeof(struct sev_data_send_start);
-	case SEV_CMD_SEND_UPDATE_DATA:		return sizeof(struct sev_data_send_update_data);
-	case SEV_CMD_SEND_UPDATE_VMSA:		return sizeof(struct sev_data_send_update_vmsa);
-	case SEV_CMD_SEND_FINISH:		return sizeof(struct sev_data_send_finish);
-	case SEV_CMD_RECEIVE_START:		return sizeof(struct sev_data_receive_start);
-	case SEV_CMD_RECEIVE_FINISH:		return sizeof(struct sev_data_receive_finish);
-	case SEV_CMD_RECEIVE_UPDATE_DATA:	return sizeof(struct sev_data_receive_update_data);
-	case SEV_CMD_RECEIVE_UPDATE_VMSA:	return sizeof(struct sev_data_receive_update_vmsa);
-	case SEV_CMD_LAUNCH_UPDATE_SECRET:	return sizeof(struct sev_data_launch_secret);
-	case SEV_CMD_DOWNLOAD_FIRMWARE:		return sizeof(struct sev_data_download_firmware);
-	case SEV_CMD_GET_ID:			return sizeof(struct sev_data_get_id);
-	default:				return 0;
-	}
-
-	return 0;
-}
-
-static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
-{
-	struct psp_device *psp = psp_master;
-	unsigned int phys_lsb, phys_msb;
-	unsigned int reg, ret = 0;
-
-	if (!psp)
-		return -ENODEV;
-
-	if (psp_dead)
-		return -EBUSY;
-
-	/* Get the physical address of the command buffer */
-	phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
-	phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
-
-	dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
-		cmd, phys_msb, phys_lsb, psp_timeout);
-
-	print_hex_dump_debug("(in):  ", DUMP_PREFIX_OFFSET, 16, 2, data,
-			     sev_cmd_buffer_len(cmd), false);
-
-	iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg);
-	iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg);
-
-	psp->sev_int_rcvd = 0;
-
-	reg = cmd;
-	reg <<= PSP_CMDRESP_CMD_SHIFT;
-	reg |= PSP_CMDRESP_IOC;
-	iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg);
-
-	/* wait for command completion */
-	ret = sev_wait_cmd_ioc(psp, &reg, psp_timeout);
-	if (ret) {
-		if (psp_ret)
-			*psp_ret = 0;
-
-		dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd);
-		psp_dead = true;
-
-		return ret;
-	}
-
-	psp_timeout = psp_cmd_timeout;
-
-	if (psp_ret)
-		*psp_ret = reg & PSP_CMDRESP_ERR_MASK;
-
-	if (reg & PSP_CMDRESP_ERR_MASK) {
-		dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n",
-			cmd, reg & PSP_CMDRESP_ERR_MASK);
-		ret = -EIO;
-	}
-
-	print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
-			     sev_cmd_buffer_len(cmd), false);
-
-	return ret;
-}
-
-static int sev_do_cmd(int cmd, void *data, int *psp_ret)
-{
-	int rc;
-
-	mutex_lock(&sev_cmd_mutex);
-	rc = __sev_do_cmd_locked(cmd, data, psp_ret);
-	mutex_unlock(&sev_cmd_mutex);
-
-	return rc;
-}
-
-static int __sev_platform_init_locked(int *error)
-{
-	struct psp_device *psp = psp_master;
-	int rc = 0;
-
-	if (!psp)
-		return -ENODEV;
-
-	if (psp->sev_state == SEV_STATE_INIT)
-		return 0;
-
-	rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error);
-	if (rc)
-		return rc;
-
-	psp->sev_state = SEV_STATE_INIT;
-
-	/* Prepare for first SEV guest launch after INIT */
-	wbinvd_on_all_cpus();
-	rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
-	if (rc)
-		return rc;
-
-	dev_dbg(psp->dev, "SEV firmware initialized\n");
-
-	return rc;
-}
-
-int sev_platform_init(int *error)
-{
-	int rc;
-
-	mutex_lock(&sev_cmd_mutex);
-	rc = __sev_platform_init_locked(error);
-	mutex_unlock(&sev_cmd_mutex);
-
-	return rc;
-}
-EXPORT_SYMBOL_GPL(sev_platform_init);
-
-static int __sev_platform_shutdown_locked(int *error)
-{
-	int ret;
-
-	ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
-	if (ret)
-		return ret;
-
-	psp_master->sev_state = SEV_STATE_UNINIT;
-	dev_dbg(psp_master->dev, "SEV firmware shutdown\n");
-
-	return ret;
-}
-
-static int sev_platform_shutdown(int *error)
+static unsigned int psp_get_capability(struct psp_device *psp)
 {
-	int rc;
-
-	mutex_lock(&sev_cmd_mutex);
-	rc = __sev_platform_shutdown_locked(NULL);
-	mutex_unlock(&sev_cmd_mutex);
-
-	return rc;
-}
-
-static int sev_get_platform_state(int *state, int *error)
-{
-	int rc;
-
-	rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
-				 &psp_master->status_cmd_buf, error);
-	if (rc)
-		return rc;
-
-	*state = psp_master->status_cmd_buf.state;
-	return rc;
-}
-
-static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
-{
-	int state, rc;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
+	unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg);
 
 	/*
-	 * The SEV spec requires that FACTORY_RESET must be issued in
-	 * UNINIT state. Before we go further lets check if any guest is
-	 * active.
-	 *
-	 * If FW is in WORKING state then deny the request otherwise issue
-	 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
-	 *
-	 */
-	rc = sev_get_platform_state(&state, &argp->error);
-	if (rc)
-		return rc;
-
-	if (state == SEV_STATE_WORKING)
-		return -EBUSY;
-
-	if (state == SEV_STATE_INIT) {
-		rc = __sev_platform_shutdown_locked(&argp->error);
-		if (rc)
-			return rc;
-	}
-
-	return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
-}
-
-static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
-{
-	struct sev_user_data_status *data = &psp_master->status_cmd_buf;
-	int ret;
-
-	ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
-	if (ret)
-		return ret;
-
-	if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
-		ret = -EFAULT;
-
-	return ret;
-}
-
-static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
-{
-	int rc;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	if (psp_master->sev_state == SEV_STATE_UNINIT) {
-		rc = __sev_platform_init_locked(&argp->error);
-		if (rc)
-			return rc;
-	}
-
-	return __sev_do_cmd_locked(cmd, NULL, &argp->error);
-}
-
-static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
-{
-	struct sev_user_data_pek_csr input;
-	struct sev_data_pek_csr *data;
-	void *blob = NULL;
-	int ret;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
-		return -EFAULT;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	/* userspace wants to query CSR length */
-	if (!input.address || !input.length)
-		goto cmd;
-
-	/* allocate a physically contiguous buffer to store the CSR blob */
-	if (!access_ok(input.address, input.length) ||
-	    input.length > SEV_FW_BLOB_MAX_SIZE) {
-		ret = -EFAULT;
-		goto e_free;
-	}
-
-	blob = kmalloc(input.length, GFP_KERNEL);
-	if (!blob) {
-		ret = -ENOMEM;
-		goto e_free;
-	}
-
-	data->address = __psp_pa(blob);
-	data->len = input.length;
-
-cmd:
-	if (psp_master->sev_state == SEV_STATE_UNINIT) {
-		ret = __sev_platform_init_locked(&argp->error);
-		if (ret)
-			goto e_free_blob;
-	}
-
-	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);
-
-	 /* If we query the CSR length, FW responded with expected data. */
-	input.length = data->len;
-
-	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
-		ret = -EFAULT;
-		goto e_free_blob;
-	}
-
-	if (blob) {
-		if (copy_to_user((void __user *)input.address, blob, input.length))
-			ret = -EFAULT;
-	}
-
-e_free_blob:
-	kfree(blob);
-e_free:
-	kfree(data);
-	return ret;
-}
-
-void *psp_copy_user_blob(u64 __user uaddr, u32 len)
-{
-	if (!uaddr || !len)
-		return ERR_PTR(-EINVAL);
-
-	/* verify that blob length does not exceed our limit */
-	if (len > SEV_FW_BLOB_MAX_SIZE)
-		return ERR_PTR(-EINVAL);
-
-	return memdup_user((void __user *)(uintptr_t)uaddr, len);
-}
-EXPORT_SYMBOL_GPL(psp_copy_user_blob);
-
-static int sev_get_api_version(void)
-{
-	struct sev_user_data_status *status;
-	int error = 0, ret;
-
-	status = &psp_master->status_cmd_buf;
-	ret = sev_platform_status(status, &error);
-	if (ret) {
-		dev_err(psp_master->dev,
-			"SEV: failed to get status. Error: %#x\n", error);
-		return 1;
-	}
-
-	psp_master->api_major = status->api_major;
-	psp_master->api_minor = status->api_minor;
-	psp_master->build = status->build;
-	psp_master->sev_state = status->state;
-
-	return 0;
-}
-
-static int sev_get_firmware(struct device *dev,
-			    const struct firmware **firmware)
-{
-	char fw_name_specific[SEV_FW_NAME_SIZE];
-	char fw_name_subset[SEV_FW_NAME_SIZE];
-
-	snprintf(fw_name_specific, sizeof(fw_name_specific),
-		 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
-		 boot_cpu_data.x86, boot_cpu_data.x86_model);
-
-	snprintf(fw_name_subset, sizeof(fw_name_subset),
-		 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
-		 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
-
-	/* Check for SEV FW for a particular model.
-	 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
-	 *
-	 * or
-	 *
-	 * Check for SEV FW common to a subset of models.
-	 * Ex. amd_sev_fam17h_model0xh.sbin for
-	 *     Family 17h Model 00h -- Family 17h Model 0Fh
-	 *
-	 * or
-	 *
-	 * Fall-back to using generic name: sev.fw
+	 * Check for a access to the registers.  If this read returns
+	 * 0xffffffff, it's likely that the system is running a broken
+	 * BIOS which disallows access to the device. Stop here and
+	 * fail the PSP initialization (but not the load, as the CCP
+	 * could get properly initialized).
 	 */
-	if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
-	    (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
-	    (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
+	if (val == 0xffffffff) {
+		dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n");
 		return 0;
-
-	return -ENOENT;
-}
-
-/* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
-static int sev_update_firmware(struct device *dev)
-{
-	struct sev_data_download_firmware *data;
-	const struct firmware *firmware;
-	int ret, error, order;
-	struct page *p;
-	u64 data_size;
-
-	if (sev_get_firmware(dev, &firmware) == -ENOENT) {
-		dev_dbg(dev, "No SEV firmware file present\n");
-		return -1;
-	}
-
-	/*
-	 * SEV FW expects the physical address given to it to be 32
-	 * byte aligned. Memory allocated has structure placed at the
-	 * beginning followed by the firmware being passed to the SEV
-	 * FW. Allocate enough memory for data structure + alignment
-	 * padding + SEV FW.
-	 */
-	data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
-
-	order = get_order(firmware->size + data_size);
-	p = alloc_pages(GFP_KERNEL, order);
-	if (!p) {
-		ret = -1;
-		goto fw_err;
 	}
 
-	/*
-	 * Copy firmware data to a kernel allocated contiguous
-	 * memory region.
-	 */
-	data = page_address(p);
-	memcpy(page_address(p) + data_size, firmware->data, firmware->size);
-
-	data->address = __psp_pa(page_address(p) + data_size);
-	data->len = firmware->size;
-
-	ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
-	if (ret)
-		dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
-	else
-		dev_info(dev, "SEV firmware update successful\n");
-
-	__free_pages(p, order);
-
-fw_err:
-	release_firmware(firmware);
-
-	return ret;
+	return val;
 }
 
-static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
+static int psp_check_sev_support(struct psp_device *psp,
+				 unsigned int capability)
 {
-	struct sev_user_data_pek_cert_import input;
-	struct sev_data_pek_cert_import *data;
-	void *pek_blob, *oca_blob;
-	int ret;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
-		return -EFAULT;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	/* copy PEK certificate blobs from userspace */
-	pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
-	if (IS_ERR(pek_blob)) {
-		ret = PTR_ERR(pek_blob);
-		goto e_free;
-	}
-
-	data->pek_cert_address = __psp_pa(pek_blob);
-	data->pek_cert_len = input.pek_cert_len;
-
-	/* copy PEK certificate blobs from userspace */
-	oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
-	if (IS_ERR(oca_blob)) {
-		ret = PTR_ERR(oca_blob);
-		goto e_free_pek;
-	}
-
-	data->oca_cert_address = __psp_pa(oca_blob);
-	data->oca_cert_len = input.oca_cert_len;
-
-	/* If platform is not in INIT state then transition it to INIT */
-	if (psp_master->sev_state != SEV_STATE_INIT) {
-		ret = __sev_platform_init_locked(&argp->error);
-		if (ret)
-			goto e_free_oca;
+	/* Check if device supports SEV feature */
+	if (!(capability & 1)) {
+		dev_dbg(psp->dev, "psp does not support SEV\n");
+		return -ENODEV;
 	}
 
-	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
-
-e_free_oca:
-	kfree(oca_blob);
-e_free_pek:
-	kfree(pek_blob);
-e_free:
-	kfree(data);
-	return ret;
+	return 0;
 }
 
-static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
+static int psp_check_tee_support(struct psp_device *psp,
+				 unsigned int capability)
 {
-	struct sev_user_data_get_id2 input;
-	struct sev_data_get_id *data;
-	void *id_blob = NULL;
-	int ret;
-
-	/* SEV GET_ID is available from SEV API v0.16 and up */
-	if (!sev_version_greater_or_equal(0, 16))
-		return -ENOTSUPP;
-
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
-		return -EFAULT;
-
-	/* Check if we have write access to the userspace buffer */
-	if (input.address &&
-	    input.length &&
-	    !access_ok(input.address, input.length))
-		return -EFAULT;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	if (input.address && input.length) {
-		id_blob = kmalloc(input.length, GFP_KERNEL);
-		if (!id_blob) {
-			kfree(data);
-			return -ENOMEM;
-		}
-
-		data->address = __psp_pa(id_blob);
-		data->len = input.length;
-	}
-
-	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
-
-	/*
-	 * Firmware will return the length of the ID value (either the minimum
-	 * required length or the actual length written), return it to the user.
-	 */
-	input.length = data->len;
-
-	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
-		ret = -EFAULT;
-		goto e_free;
-	}
-
-	if (id_blob) {
-		if (copy_to_user((void __user *)input.address,
-				 id_blob, data->len)) {
-			ret = -EFAULT;
-			goto e_free;
-		}
+	/* Check if device supports TEE feature */
+	if (!(capability & 2)) {
+		dev_dbg(psp->dev, "psp does not support TEE\n");
+		return -ENODEV;
 	}
 
-e_free:
-	kfree(id_blob);
-	kfree(data);
-
-	return ret;
+	return 0;
 }
 
-static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
+static int psp_check_support(struct psp_device *psp,
+			     unsigned int capability)
 {
-	struct sev_data_get_id *data;
-	u64 data_size, user_size;
-	void *id_blob, *mem;
-	int ret;
+	int sev_support = psp_check_sev_support(psp, capability);
+	int tee_support = psp_check_tee_support(psp, capability);
 
-	/* SEV GET_ID available from SEV API v0.16 and up */
-	if (!sev_version_greater_or_equal(0, 16))
-		return -ENOTSUPP;
-
-	/* SEV FW expects the buffer it fills with the ID to be
-	 * 8-byte aligned. Memory allocated should be enough to
-	 * hold data structure + alignment padding + memory
-	 * where SEV FW writes the ID.
-	 */
-	data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
-	user_size = sizeof(struct sev_user_data_get_id);
-
-	mem = kzalloc(data_size + user_size, GFP_KERNEL);
-	if (!mem)
-		return -ENOMEM;
-
-	data = mem;
-	id_blob = mem + data_size;
-
-	data->address = __psp_pa(id_blob);
-	data->len = user_size;
-
-	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
-	if (!ret) {
-		if (copy_to_user((void __user *)argp->data, id_blob, data->len))
-			ret = -EFAULT;
-	}
-
-	kfree(mem);
+	/* Return error if device neither supports SEV nor TEE */
+	if (sev_support && tee_support)
+		return -ENODEV;
 
-	return ret;
+	return 0;
 }
 
-static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp)
+static int psp_init(struct psp_device *psp, unsigned int capability)
 {
-	struct sev_user_data_pdh_cert_export input;
-	void *pdh_blob = NULL, *cert_blob = NULL;
-	struct sev_data_pdh_cert_export *data;
 	int ret;
 
-	/* If platform is not in INIT state then transition it to INIT. */
-	if (psp_master->sev_state != SEV_STATE_INIT) {
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
-
-		ret = __sev_platform_init_locked(&argp->error);
+	if (!psp_check_sev_support(psp, capability)) {
+		ret = sev_dev_init(psp);
 		if (ret)
 			return ret;
 	}
 
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
-		return -EFAULT;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	/* Userspace wants to query the certificate length. */
-	if (!input.pdh_cert_address ||
-	    !input.pdh_cert_len ||
-	    !input.cert_chain_address)
-		goto cmd;
-
-	/* Allocate a physically contiguous buffer to store the PDH blob. */
-	if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
-	    !access_ok(input.pdh_cert_address, input.pdh_cert_len)) {
-		ret = -EFAULT;
-		goto e_free;
-	}
-
-	/* Allocate a physically contiguous buffer to store the cert chain blob. */
-	if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
-	    !access_ok(input.cert_chain_address, input.cert_chain_len)) {
-		ret = -EFAULT;
-		goto e_free;
-	}
-
-	pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
-	if (!pdh_blob) {
-		ret = -ENOMEM;
-		goto e_free;
-	}
-
-	data->pdh_cert_address = __psp_pa(pdh_blob);
-	data->pdh_cert_len = input.pdh_cert_len;
-
-	cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
-	if (!cert_blob) {
-		ret = -ENOMEM;
-		goto e_free_pdh;
-	}
-
-	data->cert_chain_address = __psp_pa(cert_blob);
-	data->cert_chain_len = input.cert_chain_len;
-
-cmd:
-	ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
-
-	/* If we query the length, FW responded with expected data. */
-	input.cert_chain_len = data->cert_chain_len;
-	input.pdh_cert_len = data->pdh_cert_len;
-
-	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
-		ret = -EFAULT;
-		goto e_free_cert;
-	}
-
-	if (pdh_blob) {
-		if (copy_to_user((void __user *)input.pdh_cert_address,
-				 pdh_blob, input.pdh_cert_len)) {
-			ret = -EFAULT;
-			goto e_free_cert;
-		}
-	}
-
-	if (cert_blob) {
-		if (copy_to_user((void __user *)input.cert_chain_address,
-				 cert_blob, input.cert_chain_len))
-			ret = -EFAULT;
-	}
-
-e_free_cert:
-	kfree(cert_blob);
-e_free_pdh:
-	kfree(pdh_blob);
-e_free:
-	kfree(data);
-	return ret;
-}
-
-static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
-{
-	void __user *argp = (void __user *)arg;
-	struct sev_issue_cmd input;
-	int ret = -EFAULT;
-
-	if (!psp_master)
-		return -ENODEV;
-
-	if (ioctl != SEV_ISSUE_CMD)
-		return -EINVAL;
-
-	if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
-		return -EFAULT;
-
-	if (input.cmd > SEV_MAX)
-		return -EINVAL;
-
-	mutex_lock(&sev_cmd_mutex);
-
-	switch (input.cmd) {
-
-	case SEV_FACTORY_RESET:
-		ret = sev_ioctl_do_reset(&input);
-		break;
-	case SEV_PLATFORM_STATUS:
-		ret = sev_ioctl_do_platform_status(&input);
-		break;
-	case SEV_PEK_GEN:
-		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input);
-		break;
-	case SEV_PDH_GEN:
-		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);
-		break;
-	case SEV_PEK_CSR:
-		ret = sev_ioctl_do_pek_csr(&input);
-		break;
-	case SEV_PEK_CERT_IMPORT:
-		ret = sev_ioctl_do_pek_import(&input);
-		break;
-	case SEV_PDH_CERT_EXPORT:
-		ret = sev_ioctl_do_pdh_export(&input);
-		break;
-	case SEV_GET_ID:
-		pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
-		ret = sev_ioctl_do_get_id(&input);
-		break;
-	case SEV_GET_ID2:
-		ret = sev_ioctl_do_get_id2(&input);
-		break;
-	default:
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
-		ret = -EFAULT;
-out:
-	mutex_unlock(&sev_cmd_mutex);
-
-	return ret;
-}
-
-static const struct file_operations sev_fops = {
-	.owner	= THIS_MODULE,
-	.unlocked_ioctl = sev_ioctl,
-};
-
-int sev_platform_status(struct sev_user_data_status *data, int *error)
-{
-	return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
-}
-EXPORT_SYMBOL_GPL(sev_platform_status);
-
-int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
-{
-	return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
-}
-EXPORT_SYMBOL_GPL(sev_guest_deactivate);
-
-int sev_guest_activate(struct sev_data_activate *data, int *error)
-{
-	return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
-}
-EXPORT_SYMBOL_GPL(sev_guest_activate);
-
-int sev_guest_decommission(struct sev_data_decommission *data, int *error)
-{
-	return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
-}
-EXPORT_SYMBOL_GPL(sev_guest_decommission);
-
-int sev_guest_df_flush(int *error)
-{
-	return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
-}
-EXPORT_SYMBOL_GPL(sev_guest_df_flush);
-
-static void sev_exit(struct kref *ref)
-{
-	struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
-
-	misc_deregister(&misc_dev->misc);
-}
-
-static int sev_misc_init(struct psp_device *psp)
-{
-	struct device *dev = psp->dev;
-	int ret;
-
-	/*
-	 * SEV feature support can be detected on multiple devices but the SEV
-	 * FW commands must be issued on the master. During probe, we do not
-	 * know the master hence we create /dev/sev on the first device probe.
-	 * sev_do_cmd() finds the right master device to which to issue the
-	 * command to the firmware.
-	 */
-	if (!misc_dev) {
-		struct miscdevice *misc;
-
-		misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
-		if (!misc_dev)
-			return -ENOMEM;
-
-		misc = &misc_dev->misc;
-		misc->minor = MISC_DYNAMIC_MINOR;
-		misc->name = DEVICE_NAME;
-		misc->fops = &sev_fops;
-
-		ret = misc_register(misc);
+	if (!psp_check_tee_support(psp, capability)) {
+		ret = tee_dev_init(psp);
 		if (ret)
 			return ret;
-
-		kref_init(&misc_dev->refcount);
-	} else {
-		kref_get(&misc_dev->refcount);
-	}
-
-	init_waitqueue_head(&psp->sev_int_queue);
-	psp->sev_misc = misc_dev;
-	dev_dbg(dev, "registered SEV device\n");
-
-	return 0;
-}
-
-static int psp_check_sev_support(struct psp_device *psp)
-{
-	unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg);
-
-	/*
-	 * Check for a access to the registers.  If this read returns
-	 * 0xffffffff, it's likely that the system is running a broken
-	 * BIOS which disallows access to the device. Stop here and
-	 * fail the PSP initialization (but not the load, as the CCP
-	 * could get properly initialized).
-	 */
-	if (val == 0xffffffff) {
-		dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n");
-		return -ENODEV;
-	}
-
-	if (!(val & 1)) {
-		/* Device does not support the SEV feature */
-		dev_dbg(psp->dev, "psp does not support SEV\n");
-		return -ENODEV;
 	}
 
 	return 0;
@@ -980,6 +136,7 @@ int psp_dev_init(struct sp_device *sp)
 {
 	struct device *dev = sp->dev;
 	struct psp_device *psp;
+	unsigned int capability;
 	int ret;
 
 	ret = -ENOMEM;
@@ -998,7 +155,11 @@ int psp_dev_init(struct sp_device *sp)
 
 	psp->io_regs = sp->io_map;
 
-	ret = psp_check_sev_support(psp);
+	capability = psp_get_capability(psp);
+	if (!capability)
+		goto e_disable;
+
+	ret = psp_check_support(psp, capability);
 	if (ret)
 		goto e_disable;
 
@@ -1013,7 +174,7 @@ int psp_dev_init(struct sp_device *sp)
 		goto e_err;
 	}
 
-	ret = sev_misc_init(psp);
+	ret = psp_init(psp, capability);
 	if (ret)
 		goto e_irq;
 
@@ -1049,83 +210,52 @@ void psp_dev_destroy(struct sp_device *sp)
 	if (!psp)
 		return;
 
-	if (psp->sev_misc)
-		kref_put(&misc_dev->refcount, sev_exit);
+	sev_dev_destroy(psp);
+
+	tee_dev_destroy(psp);
 
 	sp_free_psp_irq(sp, psp);
 }
 
-int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
-				void *data, int *error)
+void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
+			     void *data)
 {
-	if (!filep || filep->f_op != &sev_fops)
-		return -EBADF;
-
-	return  sev_do_cmd(cmd, data, error);
+	psp->sev_irq_data = data;
+	psp->sev_irq_handler = handler;
 }
-EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
 
-void psp_pci_init(void)
+void psp_clear_sev_irq_handler(struct psp_device *psp)
 {
-	struct sp_device *sp;
-	int error, rc;
-
-	sp = sp_get_psp_master_device();
-	if (!sp)
-		return;
-
-	psp_master = sp->psp_data;
-
-	psp_timeout = psp_probe_timeout;
+	psp_set_sev_irq_handler(psp, NULL, NULL);
+}
 
-	if (sev_get_api_version())
-		goto err;
+void psp_set_tee_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
+			     void *data)
+{
+	psp->tee_irq_data = data;
+	psp->tee_irq_handler = handler;
+}
 
-	/*
-	 * If platform is not in UNINIT state then firmware upgrade and/or
-	 * platform INIT command will fail. These command require UNINIT state.
-	 *
-	 * In a normal boot we should never run into case where the firmware
-	 * is not in UNINIT state on boot. But in case of kexec boot, a reboot
-	 * may not go through a typical shutdown sequence and may leave the
-	 * firmware in INIT or WORKING state.
-	 */
+void psp_clear_tee_irq_handler(struct psp_device *psp)
+{
+	psp_set_tee_irq_handler(psp, NULL, NULL);
+}
 
-	if (psp_master->sev_state != SEV_STATE_UNINIT) {
-		sev_platform_shutdown(NULL);
-		psp_master->sev_state = SEV_STATE_UNINIT;
-	}
+struct psp_device *psp_get_master_device(void)
+{
+	struct sp_device *sp = sp_get_psp_master_device();
 
-	if (sev_version_greater_or_equal(0, 15) &&
-	    sev_update_firmware(psp_master->dev) == 0)
-		sev_get_api_version();
+	return sp ? sp->psp_data : NULL;
+}
 
-	/* Initialize the platform */
-	rc = sev_platform_init(&error);
-	if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) {
-		/*
-		 * INIT command returned an integrity check failure
-		 * status code, meaning that firmware load and
-		 * validation of SEV related persistent data has
-		 * failed and persistent state has been erased.
-		 * Retrying INIT command here should succeed.
-		 */
-		dev_dbg(sp->dev, "SEV: retrying INIT command");
-		rc = sev_platform_init(&error);
-	}
+void psp_pci_init(void)
+{
+	psp_master = psp_get_master_device();
 
-	if (rc) {
-		dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
+	if (!psp_master)
 		return;
-	}
-
-	dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major,
-		 psp_master->api_minor, psp_master->build);
-
-	return;
 
-err:
-	psp_master = NULL;
+	sev_pci_init();
 }
 
 void psp_pci_exit(void)
@@ -1133,5 +263,5 @@ void psp_pci_exit(void)
 	if (!psp_master)
 		return;
 
-	sev_platform_shutdown(NULL);
+	sev_pci_exit();
 }
diff --git a/drivers/crypto/ccp/psp-dev.h b/drivers/crypto/ccp/psp-dev.h
index dd516b35ba86..ef38e4135d81 100644
--- a/drivers/crypto/ccp/psp-dev.h
+++ b/drivers/crypto/ccp/psp-dev.h
@@ -2,7 +2,7 @@
 /*
  * AMD Platform Security Processor (PSP) interface driver
  *
- * Copyright (C) 2017-2018 Advanced Micro Devices, Inc.
+ * Copyright (C) 2017-2019 Advanced Micro Devices, Inc.
  *
  * Author: Brijesh Singh <brijesh.singh@amd.com>
  */
@@ -11,35 +11,20 @@
 #define __PSP_DEV_H__
 
 #include <linux/device.h>
-#include <linux/spinlock.h>
-#include <linux/mutex.h>
 #include <linux/list.h>
-#include <linux/wait.h>
-#include <linux/dmapool.h>
-#include <linux/hw_random.h>
-#include <linux/bitops.h>
+#include <linux/bits.h>
 #include <linux/interrupt.h>
-#include <linux/irqreturn.h>
-#include <linux/dmaengine.h>
-#include <linux/psp-sev.h>
-#include <linux/miscdevice.h>
-#include <linux/capability.h>
 
 #include "sp-dev.h"
 
-#define PSP_CMD_COMPLETE		BIT(1)
-
-#define PSP_CMDRESP_CMD_SHIFT		16
-#define PSP_CMDRESP_IOC			BIT(0)
 #define PSP_CMDRESP_RESP		BIT(31)
 #define PSP_CMDRESP_ERR_MASK		0xffff
 
 #define MAX_PSP_NAME_LEN		16
 
-struct sev_misc_dev {
-	struct kref refcount;
-	struct miscdevice misc;
-};
+extern struct psp_device *psp_master;
+
+typedef void (*psp_irq_handler_t)(int, void *, unsigned int);
 
 struct psp_device {
 	struct list_head entry;
@@ -52,16 +37,24 @@ struct psp_device {
 
 	void __iomem *io_regs;
 
-	int sev_state;
-	unsigned int sev_int_rcvd;
-	wait_queue_head_t sev_int_queue;
-	struct sev_misc_dev *sev_misc;
-	struct sev_user_data_status status_cmd_buf;
-	struct sev_data_init init_cmd_buf;
+	psp_irq_handler_t sev_irq_handler;
+	void *sev_irq_data;
+
+	psp_irq_handler_t tee_irq_handler;
+	void *tee_irq_data;
 
-	u8 api_major;
-	u8 api_minor;
-	u8 build;
+	void *sev_data;
+	void *tee_data;
 };
 
+void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
+			     void *data);
+void psp_clear_sev_irq_handler(struct psp_device *psp);
+
+void psp_set_tee_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
+			     void *data);
+void psp_clear_tee_irq_handler(struct psp_device *psp);
+
+struct psp_device *psp_get_master_device(void);
+
 #endif /* __PSP_DEV_H */
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
new file mode 100644
index 000000000000..e467860f797d
--- /dev/null
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -0,0 +1,1077 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Secure Encrypted Virtualization (SEV) interface
+ *
+ * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
+ *
+ * Author: Brijesh Singh <brijesh.singh@amd.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/spinlock_types.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/ccp.h>
+#include <linux/firmware.h>
+
+#include <asm/smp.h>
+
+#include "psp-dev.h"
+#include "sev-dev.h"
+
+#define DEVICE_NAME		"sev"
+#define SEV_FW_FILE		"amd/sev.fw"
+#define SEV_FW_NAME_SIZE	64
+
+static DEFINE_MUTEX(sev_cmd_mutex);
+static struct sev_misc_dev *misc_dev;
+
+static int psp_cmd_timeout = 100;
+module_param(psp_cmd_timeout, int, 0644);
+MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
+
+static int psp_probe_timeout = 5;
+module_param(psp_probe_timeout, int, 0644);
+MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
+
+static bool psp_dead;
+static int psp_timeout;
+
+static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
+{
+	struct sev_device *sev = psp_master->sev_data;
+
+	if (sev->api_major > maj)
+		return true;
+
+	if (sev->api_major == maj && sev->api_minor >= min)
+		return true;
+
+	return false;
+}
+
+static void sev_irq_handler(int irq, void *data, unsigned int status)
+{
+	struct sev_device *sev = data;
+	int reg;
+
+	/* Check if it is command completion: */
+	if (!(status & SEV_CMD_COMPLETE))
+		return;
+
+	/* Check if it is SEV command completion: */
+	reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
+	if (reg & PSP_CMDRESP_RESP) {
+		sev->int_rcvd = 1;
+		wake_up(&sev->int_queue);
+	}
+}
+
+static int sev_wait_cmd_ioc(struct sev_device *sev,
+			    unsigned int *reg, unsigned int timeout)
+{
+	int ret;
+
+	ret = wait_event_timeout(sev->int_queue,
+			sev->int_rcvd, timeout * HZ);
+	if (!ret)
+		return -ETIMEDOUT;
+
+	*reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
+
+	return 0;
+}
+
+static int sev_cmd_buffer_len(int cmd)
+{
+	switch (cmd) {
+	case SEV_CMD_INIT:			return sizeof(struct sev_data_init);
+	case SEV_CMD_PLATFORM_STATUS:		return sizeof(struct sev_user_data_status);
+	case SEV_CMD_PEK_CSR:			return sizeof(struct sev_data_pek_csr);
+	case SEV_CMD_PEK_CERT_IMPORT:		return sizeof(struct sev_data_pek_cert_import);
+	case SEV_CMD_PDH_CERT_EXPORT:		return sizeof(struct sev_data_pdh_cert_export);
+	case SEV_CMD_LAUNCH_START:		return sizeof(struct sev_data_launch_start);
+	case SEV_CMD_LAUNCH_UPDATE_DATA:	return sizeof(struct sev_data_launch_update_data);
+	case SEV_CMD_LAUNCH_UPDATE_VMSA:	return sizeof(struct sev_data_launch_update_vmsa);
+	case SEV_CMD_LAUNCH_FINISH:		return sizeof(struct sev_data_launch_finish);
+	case SEV_CMD_LAUNCH_MEASURE:		return sizeof(struct sev_data_launch_measure);
+	case SEV_CMD_ACTIVATE:			return sizeof(struct sev_data_activate);
+	case SEV_CMD_DEACTIVATE:		return sizeof(struct sev_data_deactivate);
+	case SEV_CMD_DECOMMISSION:		return sizeof(struct sev_data_decommission);
+	case SEV_CMD_GUEST_STATUS:		return sizeof(struct sev_data_guest_status);
+	case SEV_CMD_DBG_DECRYPT:		return sizeof(struct sev_data_dbg);
+	case SEV_CMD_DBG_ENCRYPT:		return sizeof(struct sev_data_dbg);
+	case SEV_CMD_SEND_START:		return sizeof(struct sev_data_send_start);
+	case SEV_CMD_SEND_UPDATE_DATA:		return sizeof(struct sev_data_send_update_data);
+	case SEV_CMD_SEND_UPDATE_VMSA:		return sizeof(struct sev_data_send_update_vmsa);
+	case SEV_CMD_SEND_FINISH:		return sizeof(struct sev_data_send_finish);
+	case SEV_CMD_RECEIVE_START:		return sizeof(struct sev_data_receive_start);
+	case SEV_CMD_RECEIVE_FINISH:		return sizeof(struct sev_data_receive_finish);
+	case SEV_CMD_RECEIVE_UPDATE_DATA:	return sizeof(struct sev_data_receive_update_data);
+	case SEV_CMD_RECEIVE_UPDATE_VMSA:	return sizeof(struct sev_data_receive_update_vmsa);
+	case SEV_CMD_LAUNCH_UPDATE_SECRET:	return sizeof(struct sev_data_launch_secret);
+	case SEV_CMD_DOWNLOAD_FIRMWARE:		return sizeof(struct sev_data_download_firmware);
+	case SEV_CMD_GET_ID:			return sizeof(struct sev_data_get_id);
+	default:				return 0;
+	}
+
+	return 0;
+}
+
+static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
+{
+	struct psp_device *psp = psp_master;
+	struct sev_device *sev;
+	unsigned int phys_lsb, phys_msb;
+	unsigned int reg, ret = 0;
+
+	if (!psp || !psp->sev_data)
+		return -ENODEV;
+
+	if (psp_dead)
+		return -EBUSY;
+
+	sev = psp->sev_data;
+
+	/* Get the physical address of the command buffer */
+	phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
+	phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
+
+	dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
+		cmd, phys_msb, phys_lsb, psp_timeout);
+
+	print_hex_dump_debug("(in):  ", DUMP_PREFIX_OFFSET, 16, 2, data,
+			     sev_cmd_buffer_len(cmd), false);
+
+	iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
+	iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
+
+	sev->int_rcvd = 0;
+
+	reg = cmd;
+	reg <<= SEV_CMDRESP_CMD_SHIFT;
+	reg |= SEV_CMDRESP_IOC;
+	iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
+
+	/* wait for command completion */
+	ret = sev_wait_cmd_ioc(sev, &reg, psp_timeout);
+	if (ret) {
+		if (psp_ret)
+			*psp_ret = 0;
+
+		dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
+		psp_dead = true;
+
+		return ret;
+	}
+
+	psp_timeout = psp_cmd_timeout;
+
+	if (psp_ret)
+		*psp_ret = reg & PSP_CMDRESP_ERR_MASK;
+
+	if (reg & PSP_CMDRESP_ERR_MASK) {
+		dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n",
+			cmd, reg & PSP_CMDRESP_ERR_MASK);
+		ret = -EIO;
+	}
+
+	print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
+			     sev_cmd_buffer_len(cmd), false);
+
+	return ret;
+}
+
+static int sev_do_cmd(int cmd, void *data, int *psp_ret)
+{
+	int rc;
+
+	mutex_lock(&sev_cmd_mutex);
+	rc = __sev_do_cmd_locked(cmd, data, psp_ret);
+	mutex_unlock(&sev_cmd_mutex);
+
+	return rc;
+}
+
+static int __sev_platform_init_locked(int *error)
+{
+	struct psp_device *psp = psp_master;
+	struct sev_device *sev;
+	int rc = 0;
+
+	if (!psp || !psp->sev_data)
+		return -ENODEV;
+
+	sev = psp->sev_data;
+
+	if (sev->state == SEV_STATE_INIT)
+		return 0;
+
+	rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error);
+	if (rc)
+		return rc;
+
+	sev->state = SEV_STATE_INIT;
+
+	/* Prepare for first SEV guest launch after INIT */
+	wbinvd_on_all_cpus();
+	rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
+	if (rc)
+		return rc;
+
+	dev_dbg(sev->dev, "SEV firmware initialized\n");
+
+	return rc;
+}
+
+int sev_platform_init(int *error)
+{
+	int rc;
+
+	mutex_lock(&sev_cmd_mutex);
+	rc = __sev_platform_init_locked(error);
+	mutex_unlock(&sev_cmd_mutex);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(sev_platform_init);
+
+static int __sev_platform_shutdown_locked(int *error)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	int ret;
+
+	ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
+	if (ret)
+		return ret;
+
+	sev->state = SEV_STATE_UNINIT;
+	dev_dbg(sev->dev, "SEV firmware shutdown\n");
+
+	return ret;
+}
+
+static int sev_platform_shutdown(int *error)
+{
+	int rc;
+
+	mutex_lock(&sev_cmd_mutex);
+	rc = __sev_platform_shutdown_locked(NULL);
+	mutex_unlock(&sev_cmd_mutex);
+
+	return rc;
+}
+
+static int sev_get_platform_state(int *state, int *error)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	int rc;
+
+	rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
+				 &sev->status_cmd_buf, error);
+	if (rc)
+		return rc;
+
+	*state = sev->status_cmd_buf.state;
+	return rc;
+}
+
+static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
+{
+	int state, rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	/*
+	 * The SEV spec requires that FACTORY_RESET must be issued in
+	 * UNINIT state. Before we go further lets check if any guest is
+	 * active.
+	 *
+	 * If FW is in WORKING state then deny the request otherwise issue
+	 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
+	 *
+	 */
+	rc = sev_get_platform_state(&state, &argp->error);
+	if (rc)
+		return rc;
+
+	if (state == SEV_STATE_WORKING)
+		return -EBUSY;
+
+	if (state == SEV_STATE_INIT) {
+		rc = __sev_platform_shutdown_locked(&argp->error);
+		if (rc)
+			return rc;
+	}
+
+	return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
+}
+
+static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	struct sev_user_data_status *data = &sev->status_cmd_buf;
+	int ret;
+
+	ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
+	if (ret)
+		return ret;
+
+	if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
+		ret = -EFAULT;
+
+	return ret;
+}
+
+static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (sev->state == SEV_STATE_UNINIT) {
+		rc = __sev_platform_init_locked(&argp->error);
+		if (rc)
+			return rc;
+	}
+
+	return __sev_do_cmd_locked(cmd, NULL, &argp->error);
+}
+
+static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	struct sev_user_data_pek_csr input;
+	struct sev_data_pek_csr *data;
+	void *blob = NULL;
+	int ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
+		return -EFAULT;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	/* userspace wants to query CSR length */
+	if (!input.address || !input.length)
+		goto cmd;
+
+	/* allocate a physically contiguous buffer to store the CSR blob */
+	if (!access_ok(input.address, input.length) ||
+	    input.length > SEV_FW_BLOB_MAX_SIZE) {
+		ret = -EFAULT;
+		goto e_free;
+	}
+
+	blob = kmalloc(input.length, GFP_KERNEL);
+	if (!blob) {
+		ret = -ENOMEM;
+		goto e_free;
+	}
+
+	data->address = __psp_pa(blob);
+	data->len = input.length;
+
+cmd:
+	if (sev->state == SEV_STATE_UNINIT) {
+		ret = __sev_platform_init_locked(&argp->error);
+		if (ret)
+			goto e_free_blob;
+	}
+
+	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);
+
+	 /* If we query the CSR length, FW responded with expected data. */
+	input.length = data->len;
+
+	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
+		ret = -EFAULT;
+		goto e_free_blob;
+	}
+
+	if (blob) {
+		if (copy_to_user((void __user *)input.address, blob, input.length))
+			ret = -EFAULT;
+	}
+
+e_free_blob:
+	kfree(blob);
+e_free:
+	kfree(data);
+	return ret;
+}
+
+void *psp_copy_user_blob(u64 __user uaddr, u32 len)
+{
+	if (!uaddr || !len)
+		return ERR_PTR(-EINVAL);
+
+	/* verify that blob length does not exceed our limit */
+	if (len > SEV_FW_BLOB_MAX_SIZE)
+		return ERR_PTR(-EINVAL);
+
+	return memdup_user((void __user *)(uintptr_t)uaddr, len);
+}
+EXPORT_SYMBOL_GPL(psp_copy_user_blob);
+
+static int sev_get_api_version(void)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	struct sev_user_data_status *status;
+	int error = 0, ret;
+
+	status = &sev->status_cmd_buf;
+	ret = sev_platform_status(status, &error);
+	if (ret) {
+		dev_err(sev->dev,
+			"SEV: failed to get status. Error: %#x\n", error);
+		return 1;
+	}
+
+	sev->api_major = status->api_major;
+	sev->api_minor = status->api_minor;
+	sev->build = status->build;
+	sev->state = status->state;
+
+	return 0;
+}
+
+static int sev_get_firmware(struct device *dev,
+			    const struct firmware **firmware)
+{
+	char fw_name_specific[SEV_FW_NAME_SIZE];
+	char fw_name_subset[SEV_FW_NAME_SIZE];
+
+	snprintf(fw_name_specific, sizeof(fw_name_specific),
+		 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
+		 boot_cpu_data.x86, boot_cpu_data.x86_model);
+
+	snprintf(fw_name_subset, sizeof(fw_name_subset),
+		 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
+		 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
+
+	/* Check for SEV FW for a particular model.
+	 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
+	 *
+	 * or
+	 *
+	 * Check for SEV FW common to a subset of models.
+	 * Ex. amd_sev_fam17h_model0xh.sbin for
+	 *     Family 17h Model 00h -- Family 17h Model 0Fh
+	 *
+	 * or
+	 *
+	 * Fall-back to using generic name: sev.fw
+	 */
+	if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
+	    (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
+	    (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
+		return 0;
+
+	return -ENOENT;
+}
+
+/* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
+static int sev_update_firmware(struct device *dev)
+{
+	struct sev_data_download_firmware *data;
+	const struct firmware *firmware;
+	int ret, error, order;
+	struct page *p;
+	u64 data_size;
+
+	if (sev_get_firmware(dev, &firmware) == -ENOENT) {
+		dev_dbg(dev, "No SEV firmware file present\n");
+		return -1;
+	}
+
+	/*
+	 * SEV FW expects the physical address given to it to be 32
+	 * byte aligned. Memory allocated has structure placed at the
+	 * beginning followed by the firmware being passed to the SEV
+	 * FW. Allocate enough memory for data structure + alignment
+	 * padding + SEV FW.
+	 */
+	data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
+
+	order = get_order(firmware->size + data_size);
+	p = alloc_pages(GFP_KERNEL, order);
+	if (!p) {
+		ret = -1;
+		goto fw_err;
+	}
+
+	/*
+	 * Copy firmware data to a kernel allocated contiguous
+	 * memory region.
+	 */
+	data = page_address(p);
+	memcpy(page_address(p) + data_size, firmware->data, firmware->size);
+
+	data->address = __psp_pa(page_address(p) + data_size);
+	data->len = firmware->size;
+
+	ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
+	if (ret)
+		dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
+	else
+		dev_info(dev, "SEV firmware update successful\n");
+
+	__free_pages(p, order);
+
+fw_err:
+	release_firmware(firmware);
+
+	return ret;
+}
+
+static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	struct sev_user_data_pek_cert_import input;
+	struct sev_data_pek_cert_import *data;
+	void *pek_blob, *oca_blob;
+	int ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
+		return -EFAULT;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	/* copy PEK certificate blobs from userspace */
+	pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
+	if (IS_ERR(pek_blob)) {
+		ret = PTR_ERR(pek_blob);
+		goto e_free;
+	}
+
+	data->pek_cert_address = __psp_pa(pek_blob);
+	data->pek_cert_len = input.pek_cert_len;
+
+	/* copy PEK certificate blobs from userspace */
+	oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
+	if (IS_ERR(oca_blob)) {
+		ret = PTR_ERR(oca_blob);
+		goto e_free_pek;
+	}
+
+	data->oca_cert_address = __psp_pa(oca_blob);
+	data->oca_cert_len = input.oca_cert_len;
+
+	/* If platform is not in INIT state then transition it to INIT */
+	if (sev->state != SEV_STATE_INIT) {
+		ret = __sev_platform_init_locked(&argp->error);
+		if (ret)
+			goto e_free_oca;
+	}
+
+	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
+
+e_free_oca:
+	kfree(oca_blob);
+e_free_pek:
+	kfree(pek_blob);
+e_free:
+	kfree(data);
+	return ret;
+}
+
+static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
+{
+	struct sev_user_data_get_id2 input;
+	struct sev_data_get_id *data;
+	void *id_blob = NULL;
+	int ret;
+
+	/* SEV GET_ID is available from SEV API v0.16 and up */
+	if (!sev_version_greater_or_equal(0, 16))
+		return -ENOTSUPP;
+
+	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
+		return -EFAULT;
+
+	/* Check if we have write access to the userspace buffer */
+	if (input.address &&
+	    input.length &&
+	    !access_ok(input.address, input.length))
+		return -EFAULT;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	if (input.address && input.length) {
+		id_blob = kmalloc(input.length, GFP_KERNEL);
+		if (!id_blob) {
+			kfree(data);
+			return -ENOMEM;
+		}
+
+		data->address = __psp_pa(id_blob);
+		data->len = input.length;
+	}
+
+	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
+
+	/*
+	 * Firmware will return the length of the ID value (either the minimum
+	 * required length or the actual length written), return it to the user.
+	 */
+	input.length = data->len;
+
+	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
+		ret = -EFAULT;
+		goto e_free;
+	}
+
+	if (id_blob) {
+		if (copy_to_user((void __user *)input.address,
+				 id_blob, data->len)) {
+			ret = -EFAULT;
+			goto e_free;
+		}
+	}
+
+e_free:
+	kfree(id_blob);
+	kfree(data);
+
+	return ret;
+}
+
+static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
+{
+	struct sev_data_get_id *data;
+	u64 data_size, user_size;
+	void *id_blob, *mem;
+	int ret;
+
+	/* SEV GET_ID available from SEV API v0.16 and up */
+	if (!sev_version_greater_or_equal(0, 16))
+		return -ENOTSUPP;
+
+	/* SEV FW expects the buffer it fills with the ID to be
+	 * 8-byte aligned. Memory allocated should be enough to
+	 * hold data structure + alignment padding + memory
+	 * where SEV FW writes the ID.
+	 */
+	data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
+	user_size = sizeof(struct sev_user_data_get_id);
+
+	mem = kzalloc(data_size + user_size, GFP_KERNEL);
+	if (!mem)
+		return -ENOMEM;
+
+	data = mem;
+	id_blob = mem + data_size;
+
+	data->address = __psp_pa(id_blob);
+	data->len = user_size;
+
+	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
+	if (!ret) {
+		if (copy_to_user((void __user *)argp->data, id_blob, data->len))
+			ret = -EFAULT;
+	}
+
+	kfree(mem);
+
+	return ret;
+}
+
+static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	struct sev_user_data_pdh_cert_export input;
+	void *pdh_blob = NULL, *cert_blob = NULL;
+	struct sev_data_pdh_cert_export *data;
+	int ret;
+
+	/* If platform is not in INIT state then transition it to INIT. */
+	if (sev->state != SEV_STATE_INIT) {
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		ret = __sev_platform_init_locked(&argp->error);
+		if (ret)
+			return ret;
+	}
+
+	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
+		return -EFAULT;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	/* Userspace wants to query the certificate length. */
+	if (!input.pdh_cert_address ||
+	    !input.pdh_cert_len ||
+	    !input.cert_chain_address)
+		goto cmd;
+
+	/* Allocate a physically contiguous buffer to store the PDH blob. */
+	if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
+	    !access_ok(input.pdh_cert_address, input.pdh_cert_len)) {
+		ret = -EFAULT;
+		goto e_free;
+	}
+
+	/* Allocate a physically contiguous buffer to store the cert chain blob. */
+	if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
+	    !access_ok(input.cert_chain_address, input.cert_chain_len)) {
+		ret = -EFAULT;
+		goto e_free;
+	}
+
+	pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
+	if (!pdh_blob) {
+		ret = -ENOMEM;
+		goto e_free;
+	}
+
+	data->pdh_cert_address = __psp_pa(pdh_blob);
+	data->pdh_cert_len = input.pdh_cert_len;
+
+	cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
+	if (!cert_blob) {
+		ret = -ENOMEM;
+		goto e_free_pdh;
+	}
+
+	data->cert_chain_address = __psp_pa(cert_blob);
+	data->cert_chain_len = input.cert_chain_len;
+
+cmd:
+	ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
+
+	/* If we query the length, FW responded with expected data. */
+	input.cert_chain_len = data->cert_chain_len;
+	input.pdh_cert_len = data->pdh_cert_len;
+
+	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
+		ret = -EFAULT;
+		goto e_free_cert;
+	}
+
+	if (pdh_blob) {
+		if (copy_to_user((void __user *)input.pdh_cert_address,
+				 pdh_blob, input.pdh_cert_len)) {
+			ret = -EFAULT;
+			goto e_free_cert;
+		}
+	}
+
+	if (cert_blob) {
+		if (copy_to_user((void __user *)input.cert_chain_address,
+				 cert_blob, input.cert_chain_len))
+			ret = -EFAULT;
+	}
+
+e_free_cert:
+	kfree(cert_blob);
+e_free_pdh:
+	kfree(pdh_blob);
+e_free:
+	kfree(data);
+	return ret;
+}
+
+static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	struct sev_issue_cmd input;
+	int ret = -EFAULT;
+
+	if (!psp_master || !psp_master->sev_data)
+		return -ENODEV;
+
+	if (ioctl != SEV_ISSUE_CMD)
+		return -EINVAL;
+
+	if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
+		return -EFAULT;
+
+	if (input.cmd > SEV_MAX)
+		return -EINVAL;
+
+	mutex_lock(&sev_cmd_mutex);
+
+	switch (input.cmd) {
+
+	case SEV_FACTORY_RESET:
+		ret = sev_ioctl_do_reset(&input);
+		break;
+	case SEV_PLATFORM_STATUS:
+		ret = sev_ioctl_do_platform_status(&input);
+		break;
+	case SEV_PEK_GEN:
+		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input);
+		break;
+	case SEV_PDH_GEN:
+		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);
+		break;
+	case SEV_PEK_CSR:
+		ret = sev_ioctl_do_pek_csr(&input);
+		break;
+	case SEV_PEK_CERT_IMPORT:
+		ret = sev_ioctl_do_pek_import(&input);
+		break;
+	case SEV_PDH_CERT_EXPORT:
+		ret = sev_ioctl_do_pdh_export(&input);
+		break;
+	case SEV_GET_ID:
+		pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
+		ret = sev_ioctl_do_get_id(&input);
+		break;
+	case SEV_GET_ID2:
+		ret = sev_ioctl_do_get_id2(&input);
+		break;
+	default:
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
+		ret = -EFAULT;
+out:
+	mutex_unlock(&sev_cmd_mutex);
+
+	return ret;
+}
+
+static const struct file_operations sev_fops = {
+	.owner	= THIS_MODULE,
+	.unlocked_ioctl = sev_ioctl,
+};
+
+int sev_platform_status(struct sev_user_data_status *data, int *error)
+{
+	return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_platform_status);
+
+int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
+{
+	return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_deactivate);
+
+int sev_guest_activate(struct sev_data_activate *data, int *error)
+{
+	return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_activate);
+
+int sev_guest_decommission(struct sev_data_decommission *data, int *error)
+{
+	return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_decommission);
+
+int sev_guest_df_flush(int *error)
+{
+	return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_df_flush);
+
+static void sev_exit(struct kref *ref)
+{
+	struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
+
+	misc_deregister(&misc_dev->misc);
+}
+
+static int sev_misc_init(struct sev_device *sev)
+{
+	struct device *dev = sev->dev;
+	int ret;
+
+	/*
+	 * SEV feature support can be detected on multiple devices but the SEV
+	 * FW commands must be issued on the master. During probe, we do not
+	 * know the master hence we create /dev/sev on the first device probe.
+	 * sev_do_cmd() finds the right master device to which to issue the
+	 * command to the firmware.
+	 */
+	if (!misc_dev) {
+		struct miscdevice *misc;
+
+		misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
+		if (!misc_dev)
+			return -ENOMEM;
+
+		misc = &misc_dev->misc;
+		misc->minor = MISC_DYNAMIC_MINOR;
+		misc->name = DEVICE_NAME;
+		misc->fops = &sev_fops;
+
+		ret = misc_register(misc);
+		if (ret)
+			return ret;
+
+		kref_init(&misc_dev->refcount);
+	} else {
+		kref_get(&misc_dev->refcount);
+	}
+
+	init_waitqueue_head(&sev->int_queue);
+	sev->misc = misc_dev;
+	dev_dbg(dev, "registered SEV device\n");
+
+	return 0;
+}
+
+int sev_dev_init(struct psp_device *psp)
+{
+	struct device *dev = psp->dev;
+	struct sev_device *sev;
+	int ret = -ENOMEM;
+
+	sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
+	if (!sev)
+		goto e_err;
+
+	psp->sev_data = sev;
+
+	sev->dev = dev;
+	sev->psp = psp;
+
+	sev->io_regs = psp->io_regs;
+
+	sev->vdata = (struct sev_vdata *)psp->vdata->sev;
+	if (!sev->vdata) {
+		ret = -ENODEV;
+		dev_err(dev, "sev: missing driver data\n");
+		goto e_err;
+	}
+
+	psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
+
+	ret = sev_misc_init(sev);
+	if (ret)
+		goto e_irq;
+
+	dev_notice(dev, "sev enabled\n");
+
+	return 0;
+
+e_irq:
+	psp_clear_sev_irq_handler(psp);
+e_err:
+	psp->sev_data = NULL;
+
+	dev_notice(dev, "sev initialization failed\n");
+
+	return ret;
+}
+
+void sev_dev_destroy(struct psp_device *psp)
+{
+	struct sev_device *sev = psp->sev_data;
+
+	if (!sev)
+		return;
+
+	if (sev->misc)
+		kref_put(&misc_dev->refcount, sev_exit);
+
+	psp_clear_sev_irq_handler(psp);
+}
+
+int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
+				void *data, int *error)
+{
+	if (!filep || filep->f_op != &sev_fops)
+		return -EBADF;
+
+	return sev_do_cmd(cmd, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
+
+void sev_pci_init(void)
+{
+	struct sev_device *sev = psp_master->sev_data;
+	int error, rc;
+
+	if (!sev)
+		return;
+
+	psp_timeout = psp_probe_timeout;
+
+	if (sev_get_api_version())
+		goto err;
+
+	/*
+	 * If platform is not in UNINIT state then firmware upgrade and/or
+	 * platform INIT command will fail. These command require UNINIT state.
+	 *
+	 * In a normal boot we should never run into case where the firmware
+	 * is not in UNINIT state on boot. But in case of kexec boot, a reboot
+	 * may not go through a typical shutdown sequence and may leave the
+	 * firmware in INIT or WORKING state.
+	 */
+
+	if (sev->state != SEV_STATE_UNINIT) {
+		sev_platform_shutdown(NULL);
+		sev->state = SEV_STATE_UNINIT;
+	}
+
+	if (sev_version_greater_or_equal(0, 15) &&
+	    sev_update_firmware(sev->dev) == 0)
+		sev_get_api_version();
+
+	/* Initialize the platform */
+	rc = sev_platform_init(&error);
+	if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) {
+		/*
+		 * INIT command returned an integrity check failure
+		 * status code, meaning that firmware load and
+		 * validation of SEV related persistent data has
+		 * failed and persistent state has been erased.
+		 * Retrying INIT command here should succeed.
+		 */
+		dev_dbg(sev->dev, "SEV: retrying INIT command");
+		rc = sev_platform_init(&error);
+	}
+
+	if (rc) {
+		dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error);
+		return;
+	}
+
+	dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
+		 sev->api_minor, sev->build);
+
+	return;
+
+err:
+	psp_master->sev_data = NULL;
+}
+
+void sev_pci_exit(void)
+{
+	if (!psp_master->sev_data)
+		return;
+
+	sev_platform_shutdown(NULL);
+}
diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h
new file mode 100644
index 000000000000..dd5c4fe82914
--- /dev/null
+++ b/drivers/crypto/ccp/sev-dev.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * AMD Platform Security Processor (PSP) interface driver
+ *
+ * Copyright (C) 2017-2019 Advanced Micro Devices, Inc.
+ *
+ * Author: Brijesh Singh <brijesh.singh@amd.com>
+ */
+
+#ifndef __SEV_DEV_H__
+#define __SEV_DEV_H__
+
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+#include <linux/dmapool.h>
+#include <linux/hw_random.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/dmaengine.h>
+#include <linux/psp-sev.h>
+#include <linux/miscdevice.h>
+#include <linux/capability.h>
+
+#define SEV_CMD_COMPLETE		BIT(1)
+#define SEV_CMDRESP_CMD_SHIFT		16
+#define SEV_CMDRESP_IOC			BIT(0)
+
+struct sev_misc_dev {
+	struct kref refcount;
+	struct miscdevice misc;
+};
+
+struct sev_device {
+	struct device *dev;
+	struct psp_device *psp;
+
+	void __iomem *io_regs;
+
+	struct sev_vdata *vdata;
+
+	int state;
+	unsigned int int_rcvd;
+	wait_queue_head_t int_queue;
+	struct sev_misc_dev *misc;
+	struct sev_user_data_status status_cmd_buf;
+	struct sev_data_init init_cmd_buf;
+
+	u8 api_major;
+	u8 api_minor;
+	u8 build;
+};
+
+int sev_dev_init(struct psp_device *psp);
+void sev_dev_destroy(struct psp_device *psp);
+
+void sev_pci_init(void);
+void sev_pci_exit(void);
+
+#endif /* __SEV_DEV_H */
diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
index 53c12562d31e..423594608ad1 100644
--- a/drivers/crypto/ccp/sp-dev.h
+++ b/drivers/crypto/ccp/sp-dev.h
@@ -2,7 +2,7 @@
 /*
  * AMD Secure Processor driver
  *
- * Copyright (C) 2017-2018 Advanced Micro Devices, Inc.
+ * Copyright (C) 2017-2019 Advanced Micro Devices, Inc.
  *
  * Author: Tom Lendacky <thomas.lendacky@amd.com>
  * Author: Gary R Hook <gary.hook@amd.com>
@@ -39,10 +39,23 @@ struct ccp_vdata {
 	const unsigned int rsamax;
 };
 
-struct psp_vdata {
+struct sev_vdata {
 	const unsigned int cmdresp_reg;
 	const unsigned int cmdbuff_addr_lo_reg;
 	const unsigned int cmdbuff_addr_hi_reg;
+};
+
+struct tee_vdata {
+	const unsigned int cmdresp_reg;
+	const unsigned int cmdbuff_addr_lo_reg;
+	const unsigned int cmdbuff_addr_hi_reg;
+	const unsigned int ring_wptr_reg;
+	const unsigned int ring_rptr_reg;
+};
+
+struct psp_vdata {
+	const struct sev_vdata *sev;
+	const struct tee_vdata *tee;
 	const unsigned int feature_reg;
 	const unsigned int inten_reg;
 	const unsigned int intsts_reg;
diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c
index b29d2e663e10..56c1f61c0f84 100644
--- a/drivers/crypto/ccp/sp-pci.c
+++ b/drivers/crypto/ccp/sp-pci.c
@@ -2,7 +2,7 @@
 /*
  * AMD Secure Processor device driver
  *
- * Copyright (C) 2013,2018 Advanced Micro Devices, Inc.
+ * Copyright (C) 2013,2019 Advanced Micro Devices, Inc.
  *
  * Author: Tom Lendacky <thomas.lendacky@amd.com>
  * Author: Gary R Hook <gary.hook@amd.com>
@@ -262,19 +262,42 @@ static int sp_pci_resume(struct pci_dev *pdev)
 #endif
 
 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
-static const struct psp_vdata pspv1 = {
+static const struct sev_vdata sevv1 = {
 	.cmdresp_reg		= 0x10580,
 	.cmdbuff_addr_lo_reg	= 0x105e0,
 	.cmdbuff_addr_hi_reg	= 0x105e4,
+};
+
+static const struct sev_vdata sevv2 = {
+	.cmdresp_reg		= 0x10980,
+	.cmdbuff_addr_lo_reg	= 0x109e0,
+	.cmdbuff_addr_hi_reg	= 0x109e4,
+};
+
+static const struct tee_vdata teev1 = {
+	.cmdresp_reg		= 0x10544,
+	.cmdbuff_addr_lo_reg	= 0x10548,
+	.cmdbuff_addr_hi_reg	= 0x1054c,
+	.ring_wptr_reg          = 0x10550,
+	.ring_rptr_reg          = 0x10554,
+};
+
+static const struct psp_vdata pspv1 = {
+	.sev			= &sevv1,
 	.feature_reg		= 0x105fc,
 	.inten_reg		= 0x10610,
 	.intsts_reg		= 0x10614,
 };
 
 static const struct psp_vdata pspv2 = {
-	.cmdresp_reg		= 0x10980,
-	.cmdbuff_addr_lo_reg	= 0x109e0,
-	.cmdbuff_addr_hi_reg	= 0x109e4,
+	.sev			= &sevv2,
+	.feature_reg		= 0x109fc,
+	.inten_reg		= 0x10690,
+	.intsts_reg		= 0x10694,
+};
+
+static const struct psp_vdata pspv3 = {
+	.tee			= &teev1,
 	.feature_reg		= 0x109fc,
 	.inten_reg		= 0x10690,
 	.intsts_reg		= 0x10694,
@@ -312,12 +335,22 @@ static const struct sp_dev_vdata dev_vdata[] = {
 		.psp_vdata = &pspv2,
 #endif
 	},
+	{	/* 4 */
+		.bar = 2,
+#ifdef CONFIG_CRYPTO_DEV_SP_CCP
+		.ccp_vdata = &ccpv5a,
+#endif
+#ifdef CONFIG_CRYPTO_DEV_SP_PSP
+		.psp_vdata = &pspv3,
+#endif
+	},
 };
 static const struct pci_device_id sp_pci_table[] = {
 	{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
 	{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
 	{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
 	{ PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] },
+	{ PCI_VDEVICE(AMD, 0x15DF), (kernel_ulong_t)&dev_vdata[4] },
 	/* Last entry must be zero */
 	{ 0, }
 };
diff --git a/drivers/crypto/ccp/tee-dev.c b/drivers/crypto/ccp/tee-dev.c
new file mode 100644
index 000000000000..5e697a90ea7f
--- /dev/null
+++ b/drivers/crypto/ccp/tee-dev.c
@@ -0,0 +1,375 @@
+// SPDX-License-Identifier: MIT
+/*
+ * AMD Trusted Execution Environment (TEE) interface
+ *
+ * Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
+ * Author: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
+ *
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/gfp.h>
+#include <linux/psp-sev.h>
+#include <linux/psp-tee.h>
+
+#include "psp-dev.h"
+#include "tee-dev.h"
+
+static bool psp_dead;
+
+static int tee_alloc_ring(struct psp_tee_device *tee, int ring_size)
+{
+	struct ring_buf_manager *rb_mgr = &tee->rb_mgr;
+	void *start_addr;
+
+	if (!ring_size)
+		return -EINVAL;
+
+	/* We need actual physical address instead of DMA address, since
+	 * Trusted OS running on AMD Secure Processor will map this region
+	 */
+	start_addr = (void *)__get_free_pages(GFP_KERNEL, get_order(ring_size));
+	if (!start_addr)
+		return -ENOMEM;
+
+	rb_mgr->ring_start = start_addr;
+	rb_mgr->ring_size = ring_size;
+	rb_mgr->ring_pa = __psp_pa(start_addr);
+	mutex_init(&rb_mgr->mutex);
+
+	return 0;
+}
+
+static void tee_free_ring(struct psp_tee_device *tee)
+{
+	struct ring_buf_manager *rb_mgr = &tee->rb_mgr;
+
+	if (!rb_mgr->ring_start)
+		return;
+
+	free_pages((unsigned long)rb_mgr->ring_start,
+		   get_order(rb_mgr->ring_size));
+
+	rb_mgr->ring_start = NULL;
+	rb_mgr->ring_size = 0;
+	rb_mgr->ring_pa = 0;
+	mutex_destroy(&rb_mgr->mutex);
+}
+
+static int tee_wait_cmd_poll(struct psp_tee_device *tee, unsigned int timeout,
+			     unsigned int *reg)
+{
+	/* ~10ms sleep per loop => nloop = timeout * 100 */
+	int nloop = timeout * 100;
+
+	while (--nloop) {
+		*reg = ioread32(tee->io_regs + tee->vdata->cmdresp_reg);
+		if (*reg & PSP_CMDRESP_RESP)
+			return 0;
+
+		usleep_range(10000, 10100);
+	}
+
+	dev_err(tee->dev, "tee: command timed out, disabling PSP\n");
+	psp_dead = true;
+
+	return -ETIMEDOUT;
+}
+
+static
+struct tee_init_ring_cmd *tee_alloc_cmd_buffer(struct psp_tee_device *tee)
+{
+	struct tee_init_ring_cmd *cmd;
+
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+	if (!cmd)
+		return NULL;
+
+	cmd->hi_addr = upper_32_bits(tee->rb_mgr.ring_pa);
+	cmd->low_addr = lower_32_bits(tee->rb_mgr.ring_pa);
+	cmd->size = tee->rb_mgr.ring_size;
+
+	dev_dbg(tee->dev, "tee: ring address: high = 0x%x low = 0x%x size = %u\n",
+		cmd->hi_addr, cmd->low_addr, cmd->size);
+
+	return cmd;
+}
+
+static inline void tee_free_cmd_buffer(struct tee_init_ring_cmd *cmd)
+{
+	kfree(cmd);
+}
+
+static int tee_init_ring(struct psp_tee_device *tee)
+{
+	int ring_size = MAX_RING_BUFFER_ENTRIES * sizeof(struct tee_ring_cmd);
+	struct tee_init_ring_cmd *cmd;
+	phys_addr_t cmd_buffer;
+	unsigned int reg;
+	int ret;
+
+	BUILD_BUG_ON(sizeof(struct tee_ring_cmd) != 1024);
+
+	ret = tee_alloc_ring(tee, ring_size);
+	if (ret) {
+		dev_err(tee->dev, "tee: ring allocation failed %d\n", ret);
+		return ret;
+	}
+
+	tee->rb_mgr.wptr = 0;
+
+	cmd = tee_alloc_cmd_buffer(tee);
+	if (!cmd) {
+		tee_free_ring(tee);
+		return -ENOMEM;
+	}
+
+	cmd_buffer = __psp_pa((void *)cmd);
+
+	/* Send command buffer details to Trusted OS by writing to
+	 * CPU-PSP message registers
+	 */
+
+	iowrite32(lower_32_bits(cmd_buffer),
+		  tee->io_regs + tee->vdata->cmdbuff_addr_lo_reg);
+	iowrite32(upper_32_bits(cmd_buffer),
+		  tee->io_regs + tee->vdata->cmdbuff_addr_hi_reg);
+	iowrite32(TEE_RING_INIT_CMD,
+		  tee->io_regs + tee->vdata->cmdresp_reg);
+
+	ret = tee_wait_cmd_poll(tee, TEE_DEFAULT_TIMEOUT, &reg);
+	if (ret) {
+		dev_err(tee->dev, "tee: ring init command timed out\n");
+		tee_free_ring(tee);
+		goto free_buf;
+	}
+
+	if (reg & PSP_CMDRESP_ERR_MASK) {
+		dev_err(tee->dev, "tee: ring init command failed (%#010x)\n",
+			reg & PSP_CMDRESP_ERR_MASK);
+		tee_free_ring(tee);
+		ret = -EIO;
+	}
+
+free_buf:
+	tee_free_cmd_buffer(cmd);
+
+	return ret;
+}
+
+static void tee_destroy_ring(struct psp_tee_device *tee)
+{
+	unsigned int reg;
+	int ret;
+
+	if (!tee->rb_mgr.ring_start)
+		return;
+
+	if (psp_dead)
+		goto free_ring;
+
+	iowrite32(TEE_RING_DESTROY_CMD,
+		  tee->io_regs + tee->vdata->cmdresp_reg);
+
+	ret = tee_wait_cmd_poll(tee, TEE_DEFAULT_TIMEOUT, &reg);
+	if (ret) {
+		dev_err(tee->dev, "tee: ring destroy command timed out\n");
+	} else if (reg & PSP_CMDRESP_ERR_MASK) {
+		dev_err(tee->dev, "tee: ring destroy command failed (%#010x)\n",
+			reg & PSP_CMDRESP_ERR_MASK);
+	}
+
+free_ring:
+	tee_free_ring(tee);
+}
+
+int tee_dev_init(struct psp_device *psp)
+{
+	struct device *dev = psp->dev;
+	struct psp_tee_device *tee;
+	int ret;
+
+	ret = -ENOMEM;
+	tee = devm_kzalloc(dev, sizeof(*tee), GFP_KERNEL);
+	if (!tee)
+		goto e_err;
+
+	psp->tee_data = tee;
+
+	tee->dev = dev;
+	tee->psp = psp;
+
+	tee->io_regs = psp->io_regs;
+
+	tee->vdata = (struct tee_vdata *)psp->vdata->tee;
+	if (!tee->vdata) {
+		ret = -ENODEV;
+		dev_err(dev, "tee: missing driver data\n");
+		goto e_err;
+	}
+
+	ret = tee_init_ring(tee);
+	if (ret) {
+		dev_err(dev, "tee: failed to init ring buffer\n");
+		goto e_err;
+	}
+
+	dev_notice(dev, "tee enabled\n");
+
+	return 0;
+
+e_err:
+	psp->tee_data = NULL;
+
+	dev_notice(dev, "tee initialization failed\n");
+
+	return ret;
+}
+
+void tee_dev_destroy(struct psp_device *psp)
+{
+	struct psp_tee_device *tee = psp->tee_data;
+
+	if (!tee)
+		return;
+
+	tee_destroy_ring(tee);
+}
+
+static int tee_submit_cmd(struct psp_tee_device *tee, enum tee_cmd_id cmd_id,
+			  void *buf, size_t len, struct tee_ring_cmd **resp)
+{
+	struct tee_ring_cmd *cmd;
+	u32 rptr, wptr;
+	int nloop = 1000, ret = 0;
+
+	*resp = NULL;
+
+	mutex_lock(&tee->rb_mgr.mutex);
+
+	wptr = tee->rb_mgr.wptr;
+
+	/* Check if ring buffer is full */
+	do {
+		rptr = ioread32(tee->io_regs + tee->vdata->ring_rptr_reg);
+
+		if (!(wptr + sizeof(struct tee_ring_cmd) == rptr))
+			break;
+
+		dev_info(tee->dev, "tee: ring buffer full. rptr = %u wptr = %u\n",
+			 rptr, wptr);
+
+		/* Wait if ring buffer is full */
+		mutex_unlock(&tee->rb_mgr.mutex);
+		schedule_timeout_interruptible(msecs_to_jiffies(10));
+		mutex_lock(&tee->rb_mgr.mutex);
+
+	} while (--nloop);
+
+	if (!nloop && (wptr + sizeof(struct tee_ring_cmd) == rptr)) {
+		dev_err(tee->dev, "tee: ring buffer full. rptr = %u wptr = %u\n",
+			rptr, wptr);
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	/* Pointer to empty data entry in ring buffer */
+	cmd = (struct tee_ring_cmd *)(tee->rb_mgr.ring_start + wptr);
+
+	/* Write command data into ring buffer */
+	cmd->cmd_id = cmd_id;
+	cmd->cmd_state = TEE_CMD_STATE_INIT;
+	memset(&cmd->buf[0], 0, sizeof(cmd->buf));
+	memcpy(&cmd->buf[0], buf, len);
+
+	/* Update local copy of write pointer */
+	tee->rb_mgr.wptr += sizeof(struct tee_ring_cmd);
+	if (tee->rb_mgr.wptr >= tee->rb_mgr.ring_size)
+		tee->rb_mgr.wptr = 0;
+
+	/* Trigger interrupt to Trusted OS */
+	iowrite32(tee->rb_mgr.wptr, tee->io_regs + tee->vdata->ring_wptr_reg);
+
+	/* The response is provided by Trusted OS in same
+	 * location as submitted data entry within ring buffer.
+	 */
+	*resp = cmd;
+
+unlock:
+	mutex_unlock(&tee->rb_mgr.mutex);
+
+	return ret;
+}
+
+static int tee_wait_cmd_completion(struct psp_tee_device *tee,
+				   struct tee_ring_cmd *resp,
+				   unsigned int timeout)
+{
+	/* ~5ms sleep per loop => nloop = timeout * 200 */
+	int nloop = timeout * 200;
+
+	while (--nloop) {
+		if (resp->cmd_state == TEE_CMD_STATE_COMPLETED)
+			return 0;
+
+		usleep_range(5000, 5100);
+	}
+
+	dev_err(tee->dev, "tee: command 0x%x timed out, disabling PSP\n",
+		resp->cmd_id);
+
+	psp_dead = true;
+
+	return -ETIMEDOUT;
+}
+
+int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, size_t len,
+			u32 *status)
+{
+	struct psp_device *psp = psp_get_master_device();
+	struct psp_tee_device *tee;
+	struct tee_ring_cmd *resp;
+	int ret;
+
+	if (!buf || !status || !len || len > sizeof(resp->buf))
+		return -EINVAL;
+
+	*status = 0;
+
+	if (!psp || !psp->tee_data)
+		return -ENODEV;
+
+	if (psp_dead)
+		return -EBUSY;
+
+	tee = psp->tee_data;
+
+	ret = tee_submit_cmd(tee, cmd_id, buf, len, &resp);
+	if (ret)
+		return ret;
+
+	ret = tee_wait_cmd_completion(tee, resp, TEE_DEFAULT_TIMEOUT);
+	if (ret)
+		return ret;
+
+	memcpy(buf, &resp->buf[0], len);
+	*status = resp->status;
+
+	return 0;
+}
+EXPORT_SYMBOL(psp_tee_process_cmd);
+
+int psp_check_tee_status(void)
+{
+	struct psp_device *psp = psp_get_master_device();
+
+	if (!psp || !psp->tee_data)
+		return -ENODEV;
+
+	return 0;
+}
+EXPORT_SYMBOL(psp_check_tee_status);
diff --git a/drivers/crypto/ccp/tee-dev.h b/drivers/crypto/ccp/tee-dev.h
new file mode 100644
index 000000000000..f09960112115
--- /dev/null
+++ b/drivers/crypto/ccp/tee-dev.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ *
+ * Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
+ * Author: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
+ *
+ */
+
+/* This file describes the TEE communication interface between host and AMD
+ * Secure Processor
+ */
+
+#ifndef __TEE_DEV_H__
+#define __TEE_DEV_H__
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+
+#define TEE_DEFAULT_TIMEOUT		10
+#define MAX_BUFFER_SIZE			992
+
+/**
+ * enum tee_ring_cmd_id - TEE interface commands for ring buffer configuration
+ * @TEE_RING_INIT_CMD:		Initialize ring buffer
+ * @TEE_RING_DESTROY_CMD:	Destroy ring buffer
+ * @TEE_RING_MAX_CMD:		Maximum command id
+ */
+enum tee_ring_cmd_id {
+	TEE_RING_INIT_CMD		= 0x00010000,
+	TEE_RING_DESTROY_CMD		= 0x00020000,
+	TEE_RING_MAX_CMD		= 0x000F0000,
+};
+
+/**
+ * struct tee_init_ring_cmd - Command to init TEE ring buffer
+ * @low_addr:  bits [31:0] of the physical address of ring buffer
+ * @hi_addr:   bits [63:32] of the physical address of ring buffer
+ * @size:      size of ring buffer in bytes
+ */
+struct tee_init_ring_cmd {
+	u32 low_addr;
+	u32 hi_addr;
+	u32 size;
+};
+
+#define MAX_RING_BUFFER_ENTRIES		32
+
+/**
+ * struct ring_buf_manager - Helper structure to manage ring buffer.
+ * @ring_start:  starting address of ring buffer
+ * @ring_size:   size of ring buffer in bytes
+ * @ring_pa:     physical address of ring buffer
+ * @wptr:        index to the last written entry in ring buffer
+ */
+struct ring_buf_manager {
+	struct mutex mutex;	/* synchronizes access to ring buffer */
+	void *ring_start;
+	u32 ring_size;
+	phys_addr_t ring_pa;
+	u32 wptr;
+};
+
+struct psp_tee_device {
+	struct device *dev;
+	struct psp_device *psp;
+	void __iomem *io_regs;
+	struct tee_vdata *vdata;
+	struct ring_buf_manager rb_mgr;
+};
+
+/**
+ * enum tee_cmd_state - TEE command states for the ring buffer interface
+ * @TEE_CMD_STATE_INIT:      initial state of command when sent from host
+ * @TEE_CMD_STATE_PROCESS:   command being processed by TEE environment
+ * @TEE_CMD_STATE_COMPLETED: command processing completed
+ */
+enum tee_cmd_state {
+	TEE_CMD_STATE_INIT,
+	TEE_CMD_STATE_PROCESS,
+	TEE_CMD_STATE_COMPLETED,
+};
+
+/**
+ * struct tee_ring_cmd - Structure of the command buffer in TEE ring
+ * @cmd_id:      refers to &enum tee_cmd_id. Command id for the ring buffer
+ *               interface
+ * @cmd_state:   refers to &enum tee_cmd_state
+ * @status:      status of TEE command execution
+ * @res0:        reserved region
+ * @pdata:       private data (currently unused)
+ * @res1:        reserved region
+ * @buf:         TEE command specific buffer
+ */
+struct tee_ring_cmd {
+	u32 cmd_id;
+	u32 cmd_state;
+	u32 status;
+	u32 res0[1];
+	u64 pdata;
+	u32 res1[2];
+	u8 buf[MAX_BUFFER_SIZE];
+
+	/* Total size: 1024 bytes */
+} __packed;
+
+int tee_dev_init(struct psp_device *psp);
+void tee_dev_destroy(struct psp_device *psp);
+
+#endif /* __TEE_DEV_H__ */