390 lines
10 KiB
C
390 lines
10 KiB
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) {
|
|
strlcpy(chip->ppi_version, obj->string.pointer,
|
|
sizeof(chip->ppi_version));
|
|
ACPI_FREE(obj);
|
|
}
|
|
|
|
chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
|
|
}
|