[linux-block.git] / drivers / char / tpm / tpm_ppi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012-2014 Intel Corporation
 *
 * Authors:
 * Xiaoyan Zhang <xiaoyan.zhang@intel.com>
 * Jiang Liu <jiang.liu@linux.intel.com>
 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * This file contains implementation of the sysfs interface for PPI.
 */


#include <linux/acpi.h>
#include "tpm.h"

#define TPM_PPI_REVISION_ID_1	1
#define TPM_PPI_REVISION_ID_2	2
#define TPM_PPI_FN_VERSION	1
#define TPM_PPI_FN_SUBREQ	2
#define TPM_PPI_FN_GETREQ	3
#define TPM_PPI_FN_GETACT	4
#define TPM_PPI_FN_GETRSP	5
#define TPM_PPI_FN_SUBREQ2	7
#define TPM_PPI_FN_GETOPR	8
#define PPI_TPM_REQ_MAX		101 /* PPI 1.3 for TPM 2 */
#define PPI_VS_REQ_START	128
#define PPI_VS_REQ_END		255

static const guid_t tpm_ppi_guid =
	GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
		  0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);

static bool tpm_ppi_req_has_parameter(u64 req)
{
	return req == 23;
}

static inline union acpi_object *
tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
	     union acpi_object *argv4, u64 rev)
{
	BUG_ON(!ppi_handle);
	return acpi_evaluate_dsm_typed(ppi_handle, &tpm_ppi_guid,
				       rev, func, argv4, type);
}

static ssize_t tpm_show_ppi_version(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
}

static ssize_t tpm_show_ppi_request(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	ssize_t size = -EINVAL;
	union acpi_object *obj;
	struct tpm_chip *chip = to_tpm_chip(dev);
	u64 rev = TPM_PPI_REVISION_ID_2;
	u64 req;

	if (strcmp(chip->ppi_version, "1.2") < 0)
		rev = TPM_PPI_REVISION_ID_1;

	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
			   ACPI_TYPE_PACKAGE, NULL, rev);
	if (!obj)
		return -ENXIO;

	/*
	 * output.pointer should be of package type, including two integers.
	 * The first is function return code, 0 means success and 1 means
	 * error. The second is pending TPM operation requested by the OS, 0
	 * means none and >0 means operation value.
	 */
	if (obj->package.count == 3 &&
	    obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	    obj->package.elements[1].type == ACPI_TYPE_INTEGER &&
	    obj->package.elements[2].type == ACPI_TYPE_INTEGER) {
		if (obj->package.elements[0].integer.value)
			size = -EFAULT;
		else {
			req = obj->package.elements[1].integer.value;
			if (tpm_ppi_req_has_parameter(req))
				size = scnprintf(buf, PAGE_SIZE,
				    "%llu %llu\n", req,
				    obj->package.elements[2].integer.value);
			else
				size = scnprintf(buf, PAGE_SIZE,
						"%llu\n", req);
		}
	} else if (obj->package.count == 2 &&
	    obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	    obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
		if (obj->package.elements[0].integer.value)
			size = -EFAULT;
		else
			size = scnprintf(buf, PAGE_SIZE, "%llu\n",
				 obj->package.elements[1].integer.value);
	}

	ACPI_FREE(obj);

	return size;
}

static ssize_t tpm_store_ppi_request(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	u32 req;
	u64 ret;
	int func = TPM_PPI_FN_SUBREQ;
	union acpi_object *obj, tmp[2];
	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(2, tmp);
	struct tpm_chip *chip = to_tpm_chip(dev);
	u64 rev = TPM_PPI_REVISION_ID_1;

	/*
	 * the function to submit TPM operation request to pre-os environment
	 * is updated with function index from SUBREQ to SUBREQ2 since PPI
	 * version 1.1
	 */
	if (acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
			   TPM_PPI_REVISION_ID_1, 1 << TPM_PPI_FN_SUBREQ2))
		func = TPM_PPI_FN_SUBREQ2;

	/*
	 * PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
	 * accept buffer/string/integer type, but some BIOS accept buffer/
	 * string/package type. For PPI version 1.0 and 1.1, use buffer type
	 * for compatibility, and use package type since 1.2 according to spec.
	 */
	if (strcmp(chip->ppi_version, "1.3") == 0) {
		if (sscanf(buf, "%llu %llu", &tmp[0].integer.value,
			   &tmp[1].integer.value) != 2)
			goto ppi12;
		rev = TPM_PPI_REVISION_ID_2;
		tmp[0].type = ACPI_TYPE_INTEGER;
		tmp[1].type = ACPI_TYPE_INTEGER;
	} else if (strcmp(chip->ppi_version, "1.2") < 0) {
		if (sscanf(buf, "%d", &req) != 1)
			return -EINVAL;
		argv4.type = ACPI_TYPE_BUFFER;
		argv4.buffer.length = sizeof(req);
		argv4.buffer.pointer = (u8 *)&req;
	} else {
ppi12:
		argv4.package.count = 1;
		tmp[0].type = ACPI_TYPE_INTEGER;
		if (sscanf(buf, "%llu", &tmp[0].integer.value) != 1)
			return -EINVAL;
	}

	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
			   &argv4, rev);
	if (!obj) {
		return -ENXIO;
	} else {
		ret = obj->integer.value;
		ACPI_FREE(obj);
	}

	if (ret == 0)
		return (acpi_status)count;

	return (ret == 1) ? -EPERM : -EFAULT;
}

static ssize_t tpm_show_ppi_transition_action(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	u32 ret;
	acpi_status status;
	union acpi_object *obj = NULL;
	union acpi_object tmp = {
		.buffer.type = ACPI_TYPE_BUFFER,
		.buffer.length = 0,
		.buffer.pointer = NULL
	};
	struct tpm_chip *chip = to_tpm_chip(dev);

	static char *info[] = {
		"None",
		"Shutdown",
		"Reboot",
		"OS Vendor-specific",
		"Error",
	};

	/*
	 * PPI spec defines params[3].type as empty package, but some platforms
	 * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
	 * compatibility, define params[3].type as buffer, if PPI version < 1.2
	 */
	if (strcmp(chip->ppi_version, "1.2") < 0)
		obj = &tmp;
	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
			   ACPI_TYPE_INTEGER, obj, TPM_PPI_REVISION_ID_1);
	if (!obj) {
		return -ENXIO;
	} else {
		ret = obj->integer.value;
		ACPI_FREE(obj);
	}

	if (ret < ARRAY_SIZE(info) - 1)
		status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
	else
		status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
				   info[ARRAY_SIZE(info)-1]);
	return status;
}

static ssize_t tpm_show_ppi_response(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	acpi_status status = -EINVAL;
	union acpi_object *obj, *ret_obj;
	u64 req, res;
	struct tpm_chip *chip = to_tpm_chip(dev);

	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
			   ACPI_TYPE_PACKAGE, NULL, TPM_PPI_REVISION_ID_1);
	if (!obj)
		return -ENXIO;

	/*
	 * parameter output.pointer should be of package type, including
	 * 3 integers. The first means function return code, the second means
	 * most recent TPM operation request, and the last means response to
	 * the most recent TPM operation request. Only if the first is 0, and
	 * the second integer is not 0, the response makes sense.
	 */
	ret_obj = obj->package.elements;
	if (obj->package.count < 3 ||
	    ret_obj[0].type != ACPI_TYPE_INTEGER ||
	    ret_obj[1].type != ACPI_TYPE_INTEGER ||
	    ret_obj[2].type != ACPI_TYPE_INTEGER)
		goto cleanup;

	if (ret_obj[0].integer.value) {
		status = -EFAULT;
		goto cleanup;
	}

	req = ret_obj[1].integer.value;
	res = ret_obj[2].integer.value;
	if (req) {
		if (res == 0)
			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
					   "0: Success");
		else if (res == 0xFFFFFFF0)
			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
					   "0xFFFFFFF0: User Abort");
		else if (res == 0xFFFFFFF1)
			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
					   "0xFFFFFFF1: BIOS Failure");
		else if (res >= 1 && res <= 0x00000FFF)
			status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
					   req, res, "Corresponding TPM error");
		else
			status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
					   req, res, "Error");
	} else {
		status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
				   req, "No Recent Request");
	}

cleanup:
	ACPI_FREE(obj);
	return status;
}

static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
				   u32 end)
{
	int i;
	u32 ret;
	char *str = buf;
	union acpi_object *obj, tmp;
	union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);

	static char *info[] = {
		"Not implemented",
		"BIOS only",
		"Blocked for OS by BIOS",
		"User required",
		"User not required",
	};

	if (!acpi_check_dsm(dev_handle, &tpm_ppi_guid, TPM_PPI_REVISION_ID_1,
			    1 << TPM_PPI_FN_GETOPR))
		return -EPERM;

	tmp.integer.type = ACPI_TYPE_INTEGER;
	for (i = start; i <= end; i++) {
		tmp.integer.value = i;
		obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
				   ACPI_TYPE_INTEGER, &argv,
				   TPM_PPI_REVISION_ID_1);
		if (!obj) {
			return -ENOMEM;
		} else {
			ret = obj->integer.value;
			ACPI_FREE(obj);
		}

		if (ret > 0 && ret < ARRAY_SIZE(info))
			str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
					 i, ret, info[ret]);
	}

	return str - buf;
}

static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
				   PPI_TPM_REQ_MAX);
}

static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
				   PPI_VS_REQ_END);
}

static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP,
		   tpm_show_ppi_request, tpm_store_ppi_request);
static DEVICE_ATTR(transition_action, S_IRUGO,
		   tpm_show_ppi_transition_action, NULL);
static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);

static struct attribute *ppi_attrs[] = {
	&dev_attr_version.attr,
	&dev_attr_request.attr,
	&dev_attr_transition_action.attr,
	&dev_attr_response.attr,
	&dev_attr_tcg_operations.attr,
	&dev_attr_vs_operations.attr, NULL,
};
static const struct attribute_group ppi_attr_grp = {
	.name = "ppi",
	.attrs = ppi_attrs
};

void tpm_add_ppi(struct tpm_chip *chip)
{
	union acpi_object *obj;

	if (!chip->acpi_dev_handle)
		return;

	if (!acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
			    TPM_PPI_REVISION_ID_1, 1 << TPM_PPI_FN_VERSION))
		return;

	/* Cache PPI version string. */
	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, &tpm_ppi_guid,
				      TPM_PPI_REVISION_ID_1,
				      TPM_PPI_FN_VERSION,
				      NULL, ACPI_TYPE_STRING);
	if (obj) {
		strscpy(chip->ppi_version, obj->string.pointer,
			sizeof(chip->ppi_version));
		ACPI_FREE(obj);
	}

	chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
}
Commit	Line	Data
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
0dc55365 JS	2	/*
	3	* Copyright (C) 2012-2014 Intel Corporation
	4	*
	5	* Authors:
	6	* Xiaoyan Zhang <xiaoyan.zhang@intel.com>
	7	* Jiang Liu <jiang.liu@linux.intel.com>
	8	* Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
	9	*
	10	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
	11	*
	12	* This file contains implementation of the sysfs interface for PPI.
0dc55365 JS	13	*/
	14
	15
f84fdff0	16	#include <linux/acpi.h>
f84fdff0 XZ	17	#include "tpm.h"
f84fdff0 XZ	18
09fe1b42	19	#define TPM_PPI_REVISION_ID_1 1
8b60c79b	20	#define TPM_PPI_REVISION_ID_2 2
f84fdff0 XZ	21	#define TPM_PPI_FN_VERSION 1
	22	#define TPM_PPI_FN_SUBREQ 2
	23	#define TPM_PPI_FN_GETREQ 3
	24	#define TPM_PPI_FN_GETACT 4
	25	#define TPM_PPI_FN_GETRSP 5
	26	#define TPM_PPI_FN_SUBREQ2 7
	27	#define TPM_PPI_FN_GETOPR 8
9d4023ed	28	#define PPI_TPM_REQ_MAX 101 /* PPI 1.3 for TPM 2 */
f84fdff0 XZ	29	#define PPI_VS_REQ_START 128
f84fdff0 XZ	30	#define PPI_VS_REQ_END 255
f84fdff0	31
94116f81 AS	32	static const guid_t tpm_ppi_guid =
	33	GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
	34	0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);
84b1667d	35
8b60c79b SB	36	static bool tpm_ppi_req_has_parameter(u64 req)
	37	{
	38	return req == 23;
	39	}
	40
84b1667d	41	static inline union acpi_object *
0dc55365	42	tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
587bad77	43	union acpi_object *argv4, u64 rev)
f84fdff0	44	{
0dc55365	45	BUG_ON(!ppi_handle);
94116f81	46	return acpi_evaluate_dsm_typed(ppi_handle, &tpm_ppi_guid,
587bad77	47	rev, func, argv4, type);
f84fdff0 XZ	48	}
f84fdff0 XZ	49
81198078 XZ	50	static ssize_t tpm_show_ppi_version(struct device *dev,
81198078 XZ	51	struct device_attribute attr, char buf)
f84fdff0	52	{
9b774d5c	53	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	54
0dc55365 JS	55	return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
f84fdff0 XZ	56	}
f84fdff0 XZ	57
81198078 XZ	58	static ssize_t tpm_show_ppi_request(struct device *dev,
81198078 XZ	59	struct device_attribute attr, char buf)
f84fdff0	60	{
84b1667d JL	61	ssize_t size = -EINVAL;
84b1667d JL	62	union acpi_object *obj;
9b774d5c	63	struct tpm_chip *chip = to_tpm_chip(dev);
8b60c79b SB	64	u64 rev = TPM_PPI_REVISION_ID_2;
	65	u64 req;
	66
	67	if (strcmp(chip->ppi_version, "1.2") < 0)
	68	rev = TPM_PPI_REVISION_ID_1;
84b1667d	69
0dc55365	70	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
8b60c79b	71	ACPI_TYPE_PACKAGE, NULL, rev);
84b1667d	72	if (!obj)
f84fdff0 XZ	73	return -ENXIO;
f84fdff0 XZ	74
f84fdff0 XZ	75	/*
	76	* output.pointer should be of package type, including two integers.
	77	* The first is function return code, 0 means success and 1 means
	78	* error. The second is pending TPM operation requested by the OS, 0
	79	* means none and >0 means operation value.
	80	*/
8b60c79b SB	81	if (obj->package.count == 3 &&
	82	obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	83	obj->package.elements[1].type == ACPI_TYPE_INTEGER &&
	84	obj->package.elements[2].type == ACPI_TYPE_INTEGER) {
	85	if (obj->package.elements[0].integer.value)
	86	size = -EFAULT;
	87	else {
	88	req = obj->package.elements[1].integer.value;
	89	if (tpm_ppi_req_has_parameter(req))
	90	size = scnprintf(buf, PAGE_SIZE,
	91	"%llu %llu\n", req,
	92	obj->package.elements[2].integer.value);
	93	else
	94	size = scnprintf(buf, PAGE_SIZE,
	95	"%llu\n", req);
	96	}
	97	} else if (obj->package.count == 2 &&
84b1667d JL	98	obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	99	obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
	100	if (obj->package.elements[0].integer.value)
	101	size = -EFAULT;
f84fdff0	102	else
84b1667d JL	103	size = scnprintf(buf, PAGE_SIZE, "%llu\n",
84b1667d JL	104	obj->package.elements[1].integer.value);
f84fdff0	105	}
84b1667d JL	106
	107	ACPI_FREE(obj);
	108
	109	return size;
f84fdff0 XZ	110	}
f84fdff0 XZ	111
81198078 XZ	112	static ssize_t tpm_store_ppi_request(struct device *dev,
	113	struct device_attribute *attr,
	114	const char *buf, size_t count)
f84fdff0	115	{
f84fdff0 XZ	116	u32 req;
f84fdff0 XZ	117	u64 ret;
84b1667d	118	int func = TPM_PPI_FN_SUBREQ;
50a81b60 SB	119	union acpi_object *obj, tmp[2];
50a81b60 SB	120	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(2, tmp);
9b774d5c	121	struct tpm_chip *chip = to_tpm_chip(dev);
50a81b60	122	u64 rev = TPM_PPI_REVISION_ID_1;
f84fdff0	123
f84fdff0 XZ	124	/*
	125	* the function to submit TPM operation request to pre-os environment
	126	* is updated with function index from SUBREQ to SUBREQ2 since PPI
	127	* version 1.1
	128	*/
94116f81	129	if (acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
09fe1b42	130	TPM_PPI_REVISION_ID_1, 1 << TPM_PPI_FN_SUBREQ2))
84b1667d JL	131	func = TPM_PPI_FN_SUBREQ2;
84b1667d JL	132
f84fdff0 XZ	133	/*
	134	* PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
	135	* accept buffer/string/integer type, but some BIOS accept buffer/
	136	* string/package type. For PPI version 1.0 and 1.1, use buffer type
	137	* for compatibility, and use package type since 1.2 according to spec.
	138	*/
50a81b60 SB	139	if (strcmp(chip->ppi_version, "1.3") == 0) {
	140	if (sscanf(buf, "%llu %llu", &tmp[0].integer.value,
	141	&tmp[1].integer.value) != 2)
	142	goto ppi12;
	143	rev = TPM_PPI_REVISION_ID_2;
	144	tmp[0].type = ACPI_TYPE_INTEGER;
	145	tmp[1].type = ACPI_TYPE_INTEGER;
	146	} else if (strcmp(chip->ppi_version, "1.2") < 0) {
84b1667d JL	147	if (sscanf(buf, "%d", &req) != 1)
	148	return -EINVAL;
	149	argv4.type = ACPI_TYPE_BUFFER;
	150	argv4.buffer.length = sizeof(req);
	151	argv4.buffer.pointer = (u8 *)&req;
f84fdff0	152	} else {
50a81b60 SB	153	ppi12:
	154	argv4.package.count = 1;
	155	tmp[0].type = ACPI_TYPE_INTEGER;
	156	if (sscanf(buf, "%llu", &tmp[0].integer.value) != 1)
84b1667d JL	157	return -EINVAL;
	158	}
	159
0dc55365	160	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
50a81b60	161	&argv4, rev);
84b1667d JL	162	if (!obj) {
84b1667d JL	163	return -ENXIO;
f84fdff0	164	} else {
84b1667d JL	165	ret = obj->integer.value;
84b1667d JL	166	ACPI_FREE(obj);
f84fdff0 XZ	167	}
f84fdff0 XZ	168
f84fdff0	169	if (ret == 0)
84b1667d JL	170	return (acpi_status)count;
	171
	172	return (ret == 1) ? -EPERM : -EFAULT;
f84fdff0 XZ	173	}
f84fdff0 XZ	174
81198078 XZ	175	static ssize_t tpm_show_ppi_transition_action(struct device *dev,
	176	struct device_attribute *attr,
	177	char *buf)
f84fdff0	178	{
f84fdff0	179	u32 ret;
84b1667d JL	180	acpi_status status;
	181	union acpi_object *obj = NULL;
	182	union acpi_object tmp = {
	183	.buffer.type = ACPI_TYPE_BUFFER,
	184	.buffer.length = 0,
	185	.buffer.pointer = NULL
	186	};
9b774d5c	187	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d JL	188
84b1667d JL	189	static char *info[] = {
f84fdff0 XZ	190	"None",
	191	"Shutdown",
	192	"Reboot",
	193	"OS Vendor-specific",
	194	"Error",
	195	};
f84fdff0	196
f84fdff0 XZ	197	/*
	198	* PPI spec defines params[3].type as empty package, but some platforms
	199	* (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
	200	* compatibility, define params[3].type as buffer, if PPI version < 1.2
	201	*/
0dc55365	202	if (strcmp(chip->ppi_version, "1.2") < 0)
84b1667d	203	obj = &tmp;
0dc55365	204	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
09fe1b42	205	ACPI_TYPE_INTEGER, obj, TPM_PPI_REVISION_ID_1);
84b1667d JL	206	if (!obj) {
	207	return -ENXIO;
	208	} else {
	209	ret = obj->integer.value;
	210	ACPI_FREE(obj);
f84fdff0	211	}
84b1667d	212
f84fdff0 XZ	213	if (ret < ARRAY_SIZE(info) - 1)
	214	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
	215	else
	216	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
	217	info[ARRAY_SIZE(info)-1]);
f84fdff0 XZ	218	return status;
	219	}
	220
81198078 XZ	221	static ssize_t tpm_show_ppi_response(struct device *dev,
	222	struct device_attribute *attr,
	223	char *buf)
f84fdff0	224	{
84b1667d JL	225	acpi_status status = -EINVAL;
	226	union acpi_object obj, ret_obj;
	227	u64 req, res;
9b774d5c	228	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d	229
0dc55365	230	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
09fe1b42	231	ACPI_TYPE_PACKAGE, NULL, TPM_PPI_REVISION_ID_1);
84b1667d	232	if (!obj)
f84fdff0 XZ	233	return -ENXIO;
f84fdff0 XZ	234
f84fdff0 XZ	235	/*
	236	* parameter output.pointer should be of package type, including
	237	* 3 integers. The first means function return code, the second means
	238	* most recent TPM operation request, and the last means response to
	239	* the most recent TPM operation request. Only if the first is 0, and
	240	* the second integer is not 0, the response makes sense.
	241	*/
84b1667d JL	242	ret_obj = obj->package.elements;
	243	if (obj->package.count < 3 \|\|
	244	ret_obj[0].type != ACPI_TYPE_INTEGER \|\|
	245	ret_obj[1].type != ACPI_TYPE_INTEGER \|\|
	246	ret_obj[2].type != ACPI_TYPE_INTEGER)
f84fdff0	247	goto cleanup;
84b1667d JL	248
84b1667d JL	249	if (ret_obj[0].integer.value) {
f84fdff0 XZ	250	status = -EFAULT;
	251	goto cleanup;
	252	}
84b1667d JL	253
	254	req = ret_obj[1].integer.value;
	255	res = ret_obj[2].integer.value;
	256	if (req) {
	257	if (res == 0)
f84fdff0 XZ	258	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	259	"0: Success");
84b1667d	260	else if (res == 0xFFFFFFF0)
f84fdff0 XZ	261	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	262	"0xFFFFFFF0: User Abort");
84b1667d	263	else if (res == 0xFFFFFFF1)
f84fdff0 XZ	264	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	265	"0xFFFFFFF1: BIOS Failure");
84b1667d	266	else if (res >= 1 && res <= 0x00000FFF)
f84fdff0	267	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	268	req, res, "Corresponding TPM error");
f84fdff0 XZ	269	else
f84fdff0 XZ	270	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	271	req, res, "Error");
f84fdff0 XZ	272	} else {
f84fdff0 XZ	273	status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
84b1667d	274	req, "No Recent Request");
f84fdff0	275	}
84b1667d	276
f84fdff0	277	cleanup:
84b1667d	278	ACPI_FREE(obj);
f84fdff0 XZ	279	return status;
	280	}
	281
0dc55365 JS	282	static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
0dc55365 JS	283	u32 end)
f84fdff0	284	{
f84fdff0 XZ	285	int i;
f84fdff0 XZ	286	u32 ret;
84b1667d JL	287	char *str = buf;
	288	union acpi_object *obj, tmp;
	289	union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);
	290
	291	static char *info[] = {
f84fdff0 XZ	292	"Not implemented",
	293	"BIOS only",
	294	"Blocked for OS by BIOS",
	295	"User required",
	296	"User not required",
	297	};
f84fdff0	298
09fe1b42	299	if (!acpi_check_dsm(dev_handle, &tpm_ppi_guid, TPM_PPI_REVISION_ID_1,
1569a4c4	300	1 << TPM_PPI_FN_GETOPR))
f84fdff0 XZ	301	return -EPERM;
f84fdff0 XZ	302
84b1667d	303	tmp.integer.type = ACPI_TYPE_INTEGER;
f84fdff0	304	for (i = start; i <= end; i++) {
84b1667d	305	tmp.integer.value = i;
0dc55365	306	obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
587bad77	307	ACPI_TYPE_INTEGER, &argv,
09fe1b42	308	TPM_PPI_REVISION_ID_1);
84b1667d	309	if (!obj) {
f84fdff0	310	return -ENOMEM;
84b1667d JL	311	} else {
	312	ret = obj->integer.value;
	313	ACPI_FREE(obj);
	314	}
f84fdff0	315
f84fdff0 XZ	316	if (ret > 0 && ret < ARRAY_SIZE(info))
	317	str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
	318	i, ret, info[ret]);
f84fdff0	319	}
84b1667d	320
f84fdff0 XZ	321	return str - buf;
	322	}
	323
81198078 XZ	324	static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
	325	struct device_attribute *attr,
	326	char *buf)
f84fdff0	327	{
9b774d5c	328	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	329
	330	return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
	331	PPI_TPM_REQ_MAX);
f84fdff0 XZ	332	}
f84fdff0 XZ	333
81198078 XZ	334	static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
	335	struct device_attribute *attr,
	336	char *buf)
f84fdff0	337	{
9b774d5c	338	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	339
	340	return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
	341	PPI_VS_REQ_END);
f84fdff0 XZ	342	}
	343
	344	static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
	345	static DEVICE_ATTR(request, S_IRUGO \| S_IWUSR \| S_IWGRP,
	346	tpm_show_ppi_request, tpm_store_ppi_request);
	347	static DEVICE_ATTR(transition_action, S_IRUGO,
	348	tpm_show_ppi_transition_action, NULL);
	349	static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
	350	static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
	351	static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
	352
	353	static struct attribute *ppi_attrs[] = {
	354	&dev_attr_version.attr,
	355	&dev_attr_request.attr,
	356	&dev_attr_transition_action.attr,
	357	&dev_attr_response.attr,
	358	&dev_attr_tcg_operations.attr,
	359	&dev_attr_vs_operations.attr, NULL,
	360	};
90cba8d2	361	static const struct attribute_group ppi_attr_grp = {
1631cfb7	362	.name = "ppi",
f84fdff0 XZ	363	.attrs = ppi_attrs
	364	};
	365
9b774d5c	366	void tpm_add_ppi(struct tpm_chip *chip)
f84fdff0	367	{
0dc55365	368	union acpi_object *obj;
0dc55365 JS	369
0dc55365 JS	370	if (!chip->acpi_dev_handle)
9b774d5c	371	return;
0dc55365	372
94116f81	373	if (!acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
09fe1b42	374	TPM_PPI_REVISION_ID_1, 1 << TPM_PPI_FN_VERSION))
9b774d5c	375	return;
0dc55365 JS	376
0dc55365 JS	377	/* Cache PPI version string. */
94116f81	378	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, &tpm_ppi_guid,
09fe1b42 SB	379	TPM_PPI_REVISION_ID_1,
09fe1b42 SB	380	TPM_PPI_FN_VERSION,
0dc55365 JS	381	NULL, ACPI_TYPE_STRING);
0dc55365 JS	382	if (obj) {
e174b127	383	strscpy(chip->ppi_version, obj->string.pointer,
0dc55365 JS	384	sizeof(chip->ppi_version));
	385	ACPI_FREE(obj);
	386	}
	387
9b774d5c	388	chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
f84fdff0	389	}