464 lines
13 KiB
C
464 lines
13 KiB
C
#include <linux/acpi.h>
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#include <acpi/acpi_drivers.h>
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#include "tpm.h"
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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_device_name = "TPM";
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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 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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acpi_status status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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if (strstr(buffer.pointer, context) != NULL) {
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*return_value = handle;
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kfree(buffer.pointer);
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return AE_CTRL_TERMINATE;
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}
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return AE_OK;
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}
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static inline void ppi_assign_params(union acpi_object params[4],
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u64 function_num)
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{
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params[0].type = ACPI_TYPE_BUFFER;
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params[0].buffer.length = sizeof(tpm_ppi_uuid);
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params[0].buffer.pointer = (char *)tpm_ppi_uuid;
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params[1].type = ACPI_TYPE_INTEGER;
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params[1].integer.value = TPM_PPI_REVISION_ID;
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params[2].type = ACPI_TYPE_INTEGER;
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params[2].integer.value = function_num;
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params[3].type = ACPI_TYPE_PACKAGE;
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params[3].package.count = 0;
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params[3].package.elements = NULL;
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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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acpi_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object params[4];
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union acpi_object *obj;
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input.count = 4;
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ppi_assign_params(params, TPM_PPI_FN_VERSION);
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input.pointer = params;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, ppi_callback, NULL,
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tpm_device_name, &handle);
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if (ACPI_FAILURE(status))
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return -ENXIO;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_STRING);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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obj = (union acpi_object *)output.pointer;
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status = scnprintf(buf, PAGE_SIZE, "%s\n", obj->string.pointer);
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kfree(output.pointer);
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return status;
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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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acpi_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object params[4];
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union acpi_object *ret_obj;
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input.count = 4;
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ppi_assign_params(params, TPM_PPI_FN_GETREQ);
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input.pointer = params;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, ppi_callback, NULL,
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tpm_device_name, &handle);
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if (ACPI_FAILURE(status))
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return -ENXIO;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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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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ret_obj = ((union acpi_object *)output.pointer)->package.elements;
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if (ret_obj->type == ACPI_TYPE_INTEGER) {
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if (ret_obj->integer.value) {
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status = -EFAULT;
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goto cleanup;
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}
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ret_obj++;
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if (ret_obj->type == ACPI_TYPE_INTEGER)
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status = scnprintf(buf, PAGE_SIZE, "%llu\n",
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ret_obj->integer.value);
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else
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status = -EINVAL;
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} else {
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status = -EINVAL;
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}
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cleanup:
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kfree(output.pointer);
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return status;
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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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char version[PPI_VERSION_LEN + 1];
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acpi_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object params[4];
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union acpi_object obj;
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u32 req;
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u64 ret;
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input.count = 4;
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ppi_assign_params(params, TPM_PPI_FN_VERSION);
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input.pointer = params;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, ppi_callback, NULL,
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tpm_device_name, &handle);
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if (ACPI_FAILURE(status))
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return -ENXIO;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_STRING);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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strncpy(version,
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((union acpi_object *)output.pointer)->string.pointer,
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PPI_VERSION_LEN);
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kfree(output.pointer);
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output.length = ACPI_ALLOCATE_BUFFER;
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output.pointer = NULL;
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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 (strcmp(version, "1.1") == -1)
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params[2].integer.value = TPM_PPI_FN_SUBREQ;
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else
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params[2].integer.value = 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(version, "1.2") == -1) {
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params[3].type = ACPI_TYPE_BUFFER;
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params[3].buffer.length = sizeof(req);
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sscanf(buf, "%d", &req);
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params[3].buffer.pointer = (char *)&req;
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} else {
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params[3].package.count = 1;
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obj.type = ACPI_TYPE_INTEGER;
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sscanf(buf, "%llu", &obj.integer.value);
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params[3].package.elements = &obj;
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}
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_INTEGER);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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ret = ((union acpi_object *)output.pointer)->integer.value;
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if (ret == 0)
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status = (acpi_status)count;
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else if (ret == 1)
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status = -EPERM;
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else
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status = -EFAULT;
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kfree(output.pointer);
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return status;
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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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char version[PPI_VERSION_LEN + 1];
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acpi_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object params[4];
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u32 ret;
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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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input.count = 4;
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ppi_assign_params(params, TPM_PPI_FN_VERSION);
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input.pointer = params;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, ppi_callback, NULL,
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tpm_device_name, &handle);
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if (ACPI_FAILURE(status))
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return -ENXIO;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_STRING);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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strncpy(version,
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((union acpi_object *)output.pointer)->string.pointer,
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PPI_VERSION_LEN);
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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(version, "1.2") == -1) {
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params[3].type = ACPI_TYPE_BUFFER;
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params[3].buffer.length = 0;
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params[3].buffer.pointer = NULL;
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}
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params[2].integer.value = TPM_PPI_FN_GETACT;
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kfree(output.pointer);
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output.length = ACPI_ALLOCATE_BUFFER;
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output.pointer = NULL;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_INTEGER);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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ret = ((union acpi_object *)output.pointer)->integer.value;
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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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kfree(output.pointer);
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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_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object params[4];
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union acpi_object *ret_obj;
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u64 req;
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input.count = 4;
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ppi_assign_params(params, TPM_PPI_FN_GETRSP);
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input.pointer = params;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, ppi_callback, NULL,
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tpm_device_name, &handle);
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if (ACPI_FAILURE(status))
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return -ENXIO;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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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 = ((union acpi_object *)output.pointer)->package.elements;
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if (ret_obj->type != ACPI_TYPE_INTEGER) {
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status = -EINVAL;
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goto cleanup;
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}
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if (ret_obj->integer.value) {
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status = -EFAULT;
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goto cleanup;
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}
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ret_obj++;
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if (ret_obj->type != ACPI_TYPE_INTEGER) {
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status = -EINVAL;
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goto cleanup;
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}
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if (ret_obj->integer.value) {
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req = ret_obj->integer.value;
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ret_obj++;
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if (ret_obj->type != ACPI_TYPE_INTEGER) {
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status = -EINVAL;
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goto cleanup;
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}
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if (ret_obj->integer.value == 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 (ret_obj->integer.value == 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 (ret_obj->integer.value == 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 (ret_obj->integer.value >= 1 &&
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ret_obj->integer.value <= 0x00000FFF)
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status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
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req, ret_obj->integer.value,
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"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, ret_obj->integer.value,
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"Error");
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} else {
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status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
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ret_obj->integer.value, "No Recent Request");
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}
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cleanup:
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kfree(output.pointer);
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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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char *str = buf;
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char version[PPI_VERSION_LEN];
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acpi_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object params[4];
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union acpi_object obj;
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int i;
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u32 ret;
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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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input.count = 4;
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ppi_assign_params(params, TPM_PPI_FN_VERSION);
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input.pointer = params;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, ppi_callback, NULL,
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tpm_device_name, &handle);
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if (ACPI_FAILURE(status))
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return -ENXIO;
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
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ACPI_TYPE_STRING);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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strncpy(version,
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((union acpi_object *)output.pointer)->string.pointer,
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PPI_VERSION_LEN);
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kfree(output.pointer);
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output.length = ACPI_ALLOCATE_BUFFER;
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output.pointer = NULL;
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if (strcmp(version, "1.2") == -1)
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return -EPERM;
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params[2].integer.value = TPM_PPI_FN_GETOPR;
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params[3].package.count = 1;
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obj.type = ACPI_TYPE_INTEGER;
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params[3].package.elements = &obj;
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for (i = start; i <= end; i++) {
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obj.integer.value = i;
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status = acpi_evaluate_object_typed(handle, "_DSM",
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&input, &output, ACPI_TYPE_INTEGER);
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if (ACPI_FAILURE(status))
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return -ENOMEM;
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ret = ((union acpi_object *)output.pointer)->integer.value;
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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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kfree(output.pointer);
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output.length = ACPI_ALLOCATE_BUFFER;
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output.pointer = NULL;
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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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return sysfs_create_group(parent, &ppi_attr_grp);
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}
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EXPORT_SYMBOL_GPL(tpm_add_ppi);
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void tpm_remove_ppi(struct kobject *parent)
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{
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sysfs_remove_group(parent, &ppi_attr_grp);
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}
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EXPORT_SYMBOL_GPL(tpm_remove_ppi);
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MODULE_LICENSE("GPL");
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