![Rafael J. Wysocki](/assets/img/avatar_default.png)
* acpi-dsm: ACPI / extlog: replace open-coded _DSM code with helper functions ACPI / nouveau: replace open-coded _DSM code with helper functions nouveau / ACPI: fix memory leak in ACPI _DSM related code ACPI / i915: replace open-coded _DSM code with helper functions ACPI / i2c-hid: replace open-coded _DSM code with helper functions ACPI / TPM: detect PPI features by checking availability of _DSM functions ACPI / TPM: replace open-coded _DSM code with helper functions ACPI / TPM: match node name instead of full path when searching for TPM device PCI / pci-label: treat PCI label with index 0 as valid label ACPI / PCI: replace open-coded _DSM code with helper functions PCI / pci-label: release allocated ACPI object on error recovery path ACPI: introduce helper interfaces for _DSM method
341 lines
8.9 KiB
C
341 lines
8.9 KiB
C
#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 *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(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
|
|
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(TPM_PPI_FN_GETOPR, ACPI_TYPE_INTEGER, &argv);
|
|
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)
|
|
{
|
|
return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
|
|
}
|
|
|
|
static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return show_ppi_operations(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 struct attribute_group ppi_attr_grp = {
|
|
.name = "ppi",
|
|
.attrs = ppi_attrs
|
|
};
|
|
|
|
int tpm_add_ppi(struct kobject *parent)
|
|
{
|
|
/* Cache TPM ACPI handle and version string */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
|
|
ppi_callback, NULL, NULL, &tpm_ppi_handle);
|
|
if (tpm_ppi_handle == NULL)
|
|
return -ENODEV;
|
|
|
|
return sysfs_create_group(parent, &ppi_attr_grp);
|
|
}
|
|
|
|
void tpm_remove_ppi(struct kobject *parent)
|
|
{
|
|
sysfs_remove_group(parent, &ppi_attr_grp);
|
|
}
|