driver: add PPI support in tpm driver
The Physical Presence Interface enables the OS and the BIOS to cooperate and
provides a simple and straightforward platform user experience for
administering the TPM without sacrificing security.
V2: separate the patch out in a separate source file,
add #ifdef CONFIG_ACPI so it compiles out on ppc,
use standard error instead of ACPI error as return code of show/store fns.
V3: move #ifdef CONFIG_ACPI from .c file to .h file.
V4: move tpm_ppi code from tpm module to tpm_bios module.
V5: modify sys_add_ppi() so that ppi_attr_grp doesn't need to be exported
Signed-off-by: Xiaoyan Zhang <xiaoyan.zhang@intel.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
This commit is contained in:
Xiaoyan Zhang
Kent Yoder
Родитель
1f862f0f96
Коммит
f84fdff0fd
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@ -4,7 +4,7 @@
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obj-$(CONFIG_TCG_TPM) += tpm.o
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ifdef CONFIG_ACPI
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obj-$(CONFIG_TCG_TPM) += tpm_bios.o
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tpm_bios-objs += tpm_eventlog.o tpm_acpi.o
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tpm_bios-objs += tpm_eventlog.o tpm_acpi.o tpm_ppi.o
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else
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ifdef CONFIG_TCG_IBMVTPM
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obj-$(CONFIG_TCG_TPM) += tpm_bios.o
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@ -1476,6 +1476,11 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
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goto put_device;
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}
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if (sys_add_ppi(&dev->kobj)) {
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misc_deregister(&chip->vendor.miscdev);
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goto put_device;
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}
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chip->bios_dir = tpm_bios_log_setup(devname);
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/* Make chip available */
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@ -327,3 +327,12 @@ extern int tpm_pm_suspend(struct device *);
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extern int tpm_pm_resume(struct device *);
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extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
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wait_queue_head_t *);
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#ifdef CONFIG_ACPI
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extern ssize_t sys_add_ppi(struct kobject *parent);
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#else
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static inline ssize_t sys_add_ppi(struct kobject *parent)
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{
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return 0;
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}
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#endif
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@ -0,0 +1,460 @@
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#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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ssize_t tpm_show_ppi_version(struct device *dev, 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 *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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ssize_t tpm_show_ppi_request(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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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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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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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;
|
||||
output.pointer = NULL;
|
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status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
|
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ACPI_TYPE_INTEGER);
|
||||
if (ACPI_FAILURE(status))
|
||||
return -ENOMEM;
|
||||
ret = ((union acpi_object *)output.pointer)->integer.value;
|
||||
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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ssize_t tpm_show_ppi_response(struct device *dev,
|
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struct device_attribute *attr,
|
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char *buf)
|
||||
{
|
||||
acpi_handle handle;
|
||||
acpi_status status;
|
||||
struct acpi_object_list input;
|
||||
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
|
||||
union acpi_object params[4];
|
||||
union acpi_object *ret_obj;
|
||||
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);
|
||||
if (ACPI_FAILURE(status))
|
||||
return -ENXIO;
|
||||
|
||||
status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
|
||||
ACPI_TYPE_PACKAGE);
|
||||
if (ACPI_FAILURE(status))
|
||||
return -ENOMEM;
|
||||
/*
|
||||
* parameter output.pointer should be of package type, including
|
||||
* 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
|
||||
* the most recent TPM operation request. Only if the first is 0, and
|
||||
* the second integer is not 0, the response makes sense.
|
||||
*/
|
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ret_obj = ((union acpi_object *)output.pointer)->package.elements;
|
||||
if (ret_obj->type != ACPI_TYPE_INTEGER) {
|
||||
status = -EINVAL;
|
||||
goto cleanup;
|
||||
}
|
||||
if (ret_obj->integer.value) {
|
||||
status = -EFAULT;
|
||||
goto cleanup;
|
||||
}
|
||||
ret_obj++;
|
||||
if (ret_obj->type != ACPI_TYPE_INTEGER) {
|
||||
status = -EINVAL;
|
||||
goto cleanup;
|
||||
}
|
||||
if (ret_obj->integer.value) {
|
||||
req = ret_obj->integer.value;
|
||||
ret_obj++;
|
||||
if (ret_obj->type != ACPI_TYPE_INTEGER) {
|
||||
status = -EINVAL;
|
||||
goto cleanup;
|
||||
}
|
||||
if (ret_obj->integer.value == 0)
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
|
||||
"0: Success");
|
||||
else if (ret_obj->integer.value == 0xFFFFFFF0)
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
|
||||
"0xFFFFFFF0: User Abort");
|
||||
else if (ret_obj->integer.value == 0xFFFFFFF1)
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
|
||||
"0xFFFFFFF1: BIOS Failure");
|
||||
else if (ret_obj->integer.value >= 1 &&
|
||||
ret_obj->integer.value <= 0x00000FFF)
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
|
||||
req, ret_obj->integer.value,
|
||||
"Corresponding TPM error");
|
||||
else
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
|
||||
req, ret_obj->integer.value,
|
||||
"Error");
|
||||
} else {
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
|
||||
ret_obj->integer.value, "No Recent Request");
|
||||
}
|
||||
cleanup:
|
||||
kfree(output.pointer);
|
||||
return status;
|
||||
}
|
||||
|
||||
static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
|
||||
{
|
||||
char *str = buf;
|
||||
char version[PPI_VERSION_LEN];
|
||||
acpi_handle handle;
|
||||
acpi_status status;
|
||||
struct acpi_object_list input;
|
||||
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
|
||||
union acpi_object params[4];
|
||||
union acpi_object obj;
|
||||
int i;
|
||||
u32 ret;
|
||||
char *info[] = {
|
||||
"Not implemented",
|
||||
"BIOS only",
|
||||
"Blocked for OS by BIOS",
|
||||
"User required",
|
||||
"User not required",
|
||||
};
|
||||
input.count = 4;
|
||||
ppi_assign_params(params, TPM_PPI_FN_VERSION);
|
||||
input.pointer = params;
|
||||
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
||||
ACPI_UINT32_MAX, ppi_callback, NULL,
|
||||
tpm_device_name, &handle);
|
||||
if (ACPI_FAILURE(status))
|
||||
return -ENXIO;
|
||||
|
||||
status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
|
||||
ACPI_TYPE_STRING);
|
||||
if (ACPI_FAILURE(status))
|
||||
return -ENOMEM;
|
||||
|
||||
strncpy(version,
|
||||
((union acpi_object *)output.pointer)->string.pointer,
|
||||
PPI_VERSION_LEN);
|
||||
kfree(output.pointer);
|
||||
output.length = ACPI_ALLOCATE_BUFFER;
|
||||
output.pointer = NULL;
|
||||
if (strcmp(version, "1.2") == -1)
|
||||
return -EPERM;
|
||||
|
||||
params[2].integer.value = TPM_PPI_FN_GETOPR;
|
||||
params[3].package.count = 1;
|
||||
obj.type = ACPI_TYPE_INTEGER;
|
||||
params[3].package.elements = &obj;
|
||||
for (i = start; i <= end; i++) {
|
||||
obj.integer.value = i;
|
||||
status = acpi_evaluate_object_typed(handle, "_DSM",
|
||||
&input, &output, ACPI_TYPE_INTEGER);
|
||||
if (ACPI_FAILURE(status))
|
||||
return -ENOMEM;
|
||||
|
||||
ret = ((union acpi_object *)output.pointer)->integer.value;
|
||||
if (ret > 0 && ret < ARRAY_SIZE(info))
|
||||
str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
|
||||
i, ret, info[ret]);
|
||||
kfree(output.pointer);
|
||||
output.length = ACPI_ALLOCATE_BUFFER;
|
||||
output.pointer = NULL;
|
||||
}
|
||||
return str - buf;
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
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 = {
|
||||
.attrs = ppi_attrs
|
||||
};
|
||||
|
||||
ssize_t sys_add_ppi(struct kobject *parent)
|
||||
{
|
||||
struct kobject *ppi;
|
||||
ppi = kobject_create_and_add("ppi", parent);
|
||||
if (sysfs_create_group(ppi, &ppi_attr_grp))
|
||||
return -EFAULT;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sys_add_ppi);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
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Ссылка в новой задаче