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#include <linux/acpi.h>
#include "tpm.h"
#define TPM_PPI_REVISION_ID 1
#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 22
#define PPI_VS_REQ_START 128
#define PPI_VS_REQ_END 255
#define PPI_VERSION_LEN 3
static const u8 tpm_ppi_uuid[] = {
0xA6, 0xFA, 0xDD, 0x3D,
0x1B, 0x36,
0xB4, 0x4E,
0xA4, 0x24,
0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
};
static char tpm_ppi_version[PPI_VERSION_LEN + 1];
static acpi_handle tpm_ppi_handle;
static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
void **return_value)
{
union acpi_object *obj;
if (!acpi_check_dsm(handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
1 << TPM_PPI_FN_VERSION))
return AE_OK;
/* Cache version string */
obj = acpi_evaluate_dsm_typed(handle, tpm_ppi_uuid,
TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
NULL, ACPI_TYPE_STRING);
if (obj) {
strlcpy(tpm_ppi_version, obj->string.pointer,
PPI_VERSION_LEN + 1);
ACPI_FREE(obj);
}
*return_value = handle;
return AE_CTRL_TERMINATE;
}
static inline union acpi_object *
tpm_eval_dsm(int func, acpi_object_type type, union acpi_object *argv4)
{
BUG_ON(!tpm_ppi_handle);
return acpi_evaluate_dsm_typed(tpm_ppi_handle, tpm_ppi_uuid,
TPM_PPI_REVISION_ID, func, argv4, type);
}
static ssize_t tpm_show_ppi_version(struct device *dev,
struct device_attribute *attr, char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%s\n", tpm_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;
obj = tpm_eval_dsm(TPM_PPI_FN_GETREQ, ACPI_TYPE_PACKAGE, NULL);
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 == 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;
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
/*
* 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(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
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(tpm_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 {
tmp.type = ACPI_TYPE_INTEGER;
if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
return -EINVAL;
}
obj = tpm_eval_dsm(func, ACPI_TYPE_INTEGER, &argv4);
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
};
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(tpm_ppi_version, "1.2") < 0)
obj = &tmp;
obj = tpm_eval_dsm(TPM_PPI_FN_GETACT, ACPI_TYPE_INTEGER, obj);
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;
obj = tpm_eval_dsm(TPM_PPI_FN_GETRSP, ACPI_TYPE_PACKAGE, NULL);
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(char *buf, u32 start, u32 end)
{
int i;
u32 ret;
char *str = buf;
union acpi_object
|