ACPI / TPM: replace open-coded _DSM code with helper functions
Use helper functions to simplify _DSM related code in TPM driver. This patch also help to get rid of following warning messages: [ 163.509575] ACPI Error: Incorrect return type [Buffer] requested [Package] (20130517/nsxfeval-135) But there is still an warning left. [ 181.637366] ACPI Warning: \_SB_.IIO0.LPC0.TPM_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20130517/nsarguments-95) Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu
Rafael J. Wysocki
parent
529139c973
commit
84b1667dea
@ -2,15 +2,6 @@
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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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@ -24,250 +15,185 @@ static char *tpm_device_name = "TPM";
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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_device_name = "TPM";
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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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acpi_status status = AE_OK;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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if (ACPI_SUCCESS(acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer))) {
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if (strstr(buffer.pointer, context) != NULL) {
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*return_value = handle;
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status = AE_CTRL_TERMINATE;
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status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
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if (ACPI_FAILURE(status))
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return AE_OK;
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if (strstr(buffer.pointer, context) != NULL) {
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union acpi_object *obj;
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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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kfree(buffer.pointer);
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*return_value = handle;
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status = AE_CTRL_TERMINATE;
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}
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kfree(buffer.pointer);
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return status;
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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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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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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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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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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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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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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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ssize_t size = -EINVAL;
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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_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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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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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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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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status = -EINVAL;
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} else {
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status = -EINVAL;
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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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cleanup:
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kfree(output.pointer);
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return status;
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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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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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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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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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strlcpy(version,
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((union acpi_object *)output.pointer)->string.pointer,
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PPI_VERSION_LEN + 1);
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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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if (strcmp(tpm_ppi_version, "1.1") >= 0)
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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(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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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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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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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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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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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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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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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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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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strlcpy(version,
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((union acpi_object *)output.pointer)->string.pointer,
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PPI_VERSION_LEN + 1);
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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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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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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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@ -275,27 +201,14 @@ 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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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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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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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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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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@ -303,115 +216,81 @@ static ssize_t tpm_show_ppi_response(struct device *dev,
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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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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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}
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if (ret_obj->integer.value) {
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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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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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}
|
||||
if (ret_obj->integer.value == 0)
|
||||
|
||||
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 (ret_obj->integer.value == 0xFFFFFFF0)
|
||||
else if (res == 0xFFFFFFF0)
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
|
||||
"0xFFFFFFF0: User Abort");
|
||||
else if (ret_obj->integer.value == 0xFFFFFFF1)
|
||||
else if (res == 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)
|
||||
else if (res >= 1 && res <= 0x00000FFF)
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
|
||||
req, ret_obj->integer.value,
|
||||
"Corresponding TPM error");
|
||||
req, res, "Corresponding TPM error");
|
||||
else
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
|
||||
req, ret_obj->integer.value,
|
||||
"Error");
|
||||
req, res, "Error");
|
||||
} else {
|
||||
status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
|
||||
ret_obj->integer.value, "No Recent Request");
|
||||
req, "No Recent Request");
|
||||
}
|
||||
|
||||
cleanup:
|
||||
kfree(output.pointer);
|
||||
ACPI_FREE(obj);
|
||||
return status;
|
||||
}
|
||||
|
||||
static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
|
||||
{
|
||||
char *str = buf;
|
||||
char version[PPI_VERSION_LEN + 1];
|
||||
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[] = {
|
||||
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",
|
||||
};
|
||||
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;
|
||||
|
||||
strlcpy(version,
|
||||
((union acpi_object *)output.pointer)->string.pointer,
|
||||
PPI_VERSION_LEN + 1);
|
||||
kfree(output.pointer);
|
||||
output.length = ACPI_ALLOCATE_BUFFER;
|
||||
output.pointer = NULL;
|
||||
if (strcmp(version, "1.2") == -1)
|
||||
if (strcmp(tpm_ppi_version, "1.2") < 0)
|
||||
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;
|
||||
tmp.integer.type = ACPI_TYPE_INTEGER;
|
||||
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))
|
||||
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);
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
@ -453,6 +332,13 @@ static struct attribute_group ppi_attr_grp = {
|
||||
|
||||
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,
|
||||
tpm_device_name, &tpm_ppi_handle);
|
||||
if (tpm_ppi_handle == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
return sysfs_create_group(parent, &ppi_attr_grp);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user