339 lines
8.9 KiB
C
339 lines
8.9 KiB
C
#include <linux/acpi.h>
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#include "tpm.h"
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#define TPM_PPI_REVISION_ID 1
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#define TPM_PPI_FN_VERSION 1
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#define TPM_PPI_FN_SUBREQ 2
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#define TPM_PPI_FN_GETREQ 3
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#define TPM_PPI_FN_GETACT 4
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#define TPM_PPI_FN_GETRSP 5
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#define TPM_PPI_FN_SUBREQ2 7
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#define TPM_PPI_FN_GETOPR 8
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#define PPI_TPM_REQ_MAX 22
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#define PPI_VS_REQ_START 128
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#define PPI_VS_REQ_END 255
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#define PPI_VERSION_LEN 3
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static const u8 tpm_ppi_uuid[] = {
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0xA6, 0xFA, 0xDD, 0x3D,
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0x1B, 0x36,
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0xB4, 0x4E,
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0xA4, 0x24,
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0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
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};
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static char tpm_ppi_version[PPI_VERSION_LEN + 1];
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static acpi_handle tpm_ppi_handle;
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static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
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void **return_value)
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{
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union acpi_object *obj;
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if (!acpi_check_dsm(handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
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1 << TPM_PPI_FN_VERSION))
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return AE_OK;
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/* Cache version string */
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obj = acpi_evaluate_dsm_typed(handle, tpm_ppi_uuid,
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TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
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NULL, ACPI_TYPE_STRING);
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if (obj) {
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strlcpy(tpm_ppi_version, obj->string.pointer,
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PPI_VERSION_LEN + 1);
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ACPI_FREE(obj);
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}
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*return_value = handle;
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return AE_CTRL_TERMINATE;
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}
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static inline union acpi_object *
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tpm_eval_dsm(int func, acpi_object_type type, union acpi_object *argv4)
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{
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BUG_ON(!tpm_ppi_handle);
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return acpi_evaluate_dsm_typed(tpm_ppi_handle, tpm_ppi_uuid,
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TPM_PPI_REVISION_ID, func, argv4, type);
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}
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static ssize_t tpm_show_ppi_version(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return scnprintf(buf, PAGE_SIZE, "%s\n", tpm_ppi_version);
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}
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static ssize_t tpm_show_ppi_request(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t size = -EINVAL;
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union acpi_object *obj;
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obj = tpm_eval_dsm(TPM_PPI_FN_GETREQ, ACPI_TYPE_PACKAGE, NULL);
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if (!obj)
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return -ENXIO;
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/*
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* output.pointer should be of package type, including two integers.
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* The first is function return code, 0 means success and 1 means
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* error. The second is pending TPM operation requested by the OS, 0
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* means none and >0 means operation value.
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*/
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if (obj->package.count == 2 &&
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obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
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obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
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if (obj->package.elements[0].integer.value)
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size = -EFAULT;
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else
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size = scnprintf(buf, PAGE_SIZE, "%llu\n",
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obj->package.elements[1].integer.value);
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}
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ACPI_FREE(obj);
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return size;
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}
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static ssize_t tpm_store_ppi_request(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u32 req;
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u64 ret;
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int func = TPM_PPI_FN_SUBREQ;
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union acpi_object *obj, tmp;
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union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
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/*
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* the function to submit TPM operation request to pre-os environment
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* is updated with function index from SUBREQ to SUBREQ2 since PPI
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* version 1.1
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*/
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if (acpi_check_dsm(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
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1 << TPM_PPI_FN_SUBREQ2))
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func = TPM_PPI_FN_SUBREQ2;
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/*
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* PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
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* accept buffer/string/integer type, but some BIOS accept buffer/
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* string/package type. For PPI version 1.0 and 1.1, use buffer type
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* for compatibility, and use package type since 1.2 according to spec.
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*/
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if (strcmp(tpm_ppi_version, "1.2") < 0) {
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if (sscanf(buf, "%d", &req) != 1)
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return -EINVAL;
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argv4.type = ACPI_TYPE_BUFFER;
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argv4.buffer.length = sizeof(req);
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argv4.buffer.pointer = (u8 *)&req;
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} else {
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tmp.type = ACPI_TYPE_INTEGER;
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if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
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return -EINVAL;
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}
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obj = tpm_eval_dsm(func, ACPI_TYPE_INTEGER, &argv4);
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if (!obj) {
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return -ENXIO;
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} else {
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ret = obj->integer.value;
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ACPI_FREE(obj);
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}
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if (ret == 0)
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return (acpi_status)count;
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return (ret == 1) ? -EPERM : -EFAULT;
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}
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static ssize_t tpm_show_ppi_transition_action(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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u32 ret;
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acpi_status status;
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union acpi_object *obj = NULL;
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union acpi_object tmp = {
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.buffer.type = ACPI_TYPE_BUFFER,
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.buffer.length = 0,
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.buffer.pointer = NULL
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};
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static char *info[] = {
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"None",
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"Shutdown",
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"Reboot",
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"OS Vendor-specific",
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"Error",
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};
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/*
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* PPI spec defines params[3].type as empty package, but some platforms
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* (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
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* compatibility, define params[3].type as buffer, if PPI version < 1.2
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*/
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if (strcmp(tpm_ppi_version, "1.2") < 0)
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obj = &tmp;
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obj = tpm_eval_dsm(TPM_PPI_FN_GETACT, ACPI_TYPE_INTEGER, obj);
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if (!obj) {
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return -ENXIO;
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} else {
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ret = obj->integer.value;
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ACPI_FREE(obj);
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}
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if (ret < ARRAY_SIZE(info) - 1)
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status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
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else
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status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
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info[ARRAY_SIZE(info)-1]);
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return status;
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}
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static ssize_t tpm_show_ppi_response(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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acpi_status status = -EINVAL;
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union acpi_object *obj, *ret_obj;
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u64 req, res;
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obj = tpm_eval_dsm(TPM_PPI_FN_GETRSP, ACPI_TYPE_PACKAGE, NULL);
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if (!obj)
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return -ENXIO;
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/*
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* parameter output.pointer should be of package type, including
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* 3 integers. The first means function return code, the second means
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* most recent TPM operation request, and the last means response to
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* the most recent TPM operation request. Only if the first is 0, and
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* the second integer is not 0, the response makes sense.
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*/
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ret_obj = obj->package.elements;
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if (obj->package.count < 3 ||
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ret_obj[0].type != ACPI_TYPE_INTEGER ||
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ret_obj[1].type != ACPI_TYPE_INTEGER ||
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ret_obj[2].type != ACPI_TYPE_INTEGER)
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goto cleanup;
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if (ret_obj[0].integer.value) {
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status = -EFAULT;
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goto cleanup;
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}
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req = ret_obj[1].integer.value;
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res = ret_obj[2].integer.value;
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if (req) {
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if (res == 0)
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status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
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"0: Success");
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else if (res == 0xFFFFFFF0)
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status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
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"0xFFFFFFF0: User Abort");
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else if (res == 0xFFFFFFF1)
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status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
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"0xFFFFFFF1: BIOS Failure");
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else if (res >= 1 && res <= 0x00000FFF)
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status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
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req, res, "Corresponding TPM error");
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else
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status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
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req, res, "Error");
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} else {
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status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
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req, "No Recent Request");
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}
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cleanup:
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ACPI_FREE(obj);
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return status;
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}
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static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
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{
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int i;
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u32 ret;
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char *str = buf;
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union acpi_object *obj, tmp;
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union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);
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static char *info[] = {
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"Not implemented",
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"BIOS only",
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"Blocked for OS by BIOS",
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"User required",
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"User not required",
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};
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if (!acpi_check_dsm(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
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1 << TPM_PPI_FN_GETOPR))
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return -EPERM;
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tmp.integer.type = ACPI_TYPE_INTEGER;
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for (i = start; i <= end; i++) {
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tmp.integer.value = i;
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obj = tpm_eval_dsm(TPM_PPI_FN_GETOPR, ACPI_TYPE_INTEGER, &argv);
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if (!obj) {
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return -ENOMEM;
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} else {
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ret = obj->integer.value;
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ACPI_FREE(obj);
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}
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if (ret > 0 && ret < ARRAY_SIZE(info))
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str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
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i, ret, info[ret]);
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}
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return str - buf;
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}
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static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
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}
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static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END);
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}
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static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
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static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP,
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tpm_show_ppi_request, tpm_store_ppi_request);
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static DEVICE_ATTR(transition_action, S_IRUGO,
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tpm_show_ppi_transition_action, NULL);
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static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
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static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
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static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
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static struct attribute *ppi_attrs[] = {
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&dev_attr_version.attr,
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&dev_attr_request.attr,
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&dev_attr_transition_action.attr,
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&dev_attr_response.attr,
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&dev_attr_tcg_operations.attr,
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&dev_attr_vs_operations.attr, NULL,
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};
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static struct attribute_group ppi_attr_grp = {
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.name = "ppi",
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.attrs = ppi_attrs
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};
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int tpm_add_ppi(struct kobject *parent)
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{
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/* Cache TPM ACPI handle and version string */
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acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
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ppi_callback, NULL, NULL, &tpm_ppi_handle);
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return tpm_ppi_handle ? sysfs_create_group(parent, &ppi_attr_grp) : 0;
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}
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void tpm_remove_ppi(struct kobject *parent)
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{
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if (tpm_ppi_handle)
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sysfs_remove_group(parent, &ppi_attr_grp);
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}
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