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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/char/tpm/tpm_ppi.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
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2
 /*
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  * Copyright (C) 2012-2014 Intel Corporation
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4
  *
..
..
@@ -9,18 +10,14 @@
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  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
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  *
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  * This file contains implementation of the sysfs interface for PPI.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; version 2
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- * of the License.
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13
  */
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14
 
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15
 
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16
 #include <linux/acpi.h>
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17
 #include "tpm.h"
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18
 
23
-#define TPM_PPI_REVISION_ID	1
19
+#define TPM_PPI_REVISION_ID_1	1
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+#define TPM_PPI_REVISION_ID_2	2
24
21
 #define TPM_PPI_FN_VERSION	1
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22
 #define TPM_PPI_FN_SUBREQ	2
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23
 #define TPM_PPI_FN_GETREQ	3
..
..
@@ -28,7 +25,7 @@
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25
 #define TPM_PPI_FN_GETRSP	5
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 #define TPM_PPI_FN_SUBREQ2	7
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27
 #define TPM_PPI_FN_GETOPR	8
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-#define PPI_TPM_REQ_MAX		22
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+#define PPI_TPM_REQ_MAX		101 /* PPI 1.3 for TPM 2 */
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29
 #define PPI_VS_REQ_START	128
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30
 #define PPI_VS_REQ_END		255
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31
 
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..
@@ -36,14 +33,18 @@
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33
 	GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
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34
 		  0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);
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35
 
36
+static bool tpm_ppi_req_has_parameter(u64 req)
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+{
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+	return req == 23;
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+}
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+
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 static inline union acpi_object *
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42
 tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
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-	     union acpi_object *argv4)
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+	     union acpi_object *argv4, u64 rev)
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44
 {
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 	BUG_ON(!ppi_handle);
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 	return acpi_evaluate_dsm_typed(ppi_handle, &tpm_ppi_guid,
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-				       TPM_PPI_REVISION_ID,
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-				       func, argv4, type);
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+				       rev, func, argv4, type);
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48
 }
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49
 
49
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 static ssize_t tpm_show_ppi_version(struct device *dev,
..
..
@@ -60,9 +61,14 @@
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61
 	ssize_t size = -EINVAL;
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 	union acpi_object *obj;
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63
 	struct tpm_chip *chip = to_tpm_chip(dev);
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+	u64 rev = TPM_PPI_REVISION_ID_2;
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+	u64 req;
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+
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+	if (strcmp(chip->ppi_version, "1.2") < 0)
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+		rev = TPM_PPI_REVISION_ID_1;
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69
 
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 	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
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-			   ACPI_TYPE_PACKAGE, NULL);
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+			   ACPI_TYPE_PACKAGE, NULL, rev);
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 	if (!obj)
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73
 		return -ENXIO;
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74
 
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@@ -72,7 +78,23 @@
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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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80
 	 */
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-	if (obj->package.count == 2 &&
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+	if (obj->package.count == 3 &&
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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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+	    obj->package.elements[2].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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+			req = obj->package.elements[1].integer.value;
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+			if (tpm_ppi_req_has_parameter(req))
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+				size = scnprintf(buf, PAGE_SIZE,
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+				    "%llu %llu\n", req,
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+				    obj->package.elements[2].integer.value);
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+			else
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+				size = scnprintf(buf, PAGE_SIZE,
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+						"%llu\n", req);
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+		}
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+	} else 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)
..
..
@@ -94,9 +116,10 @@
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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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+	union acpi_object *obj, tmp[2];
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+	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(2, tmp);
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 	struct tpm_chip *chip = to_tpm_chip(dev);
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+	u64 rev = TPM_PPI_REVISION_ID_1;
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123
 
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 	/*
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 	 * the function to submit TPM operation request to pre-os environment
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@@ -104,7 +127,7 @@
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 	 * version 1.1
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128
 	 */
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129
 	if (acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
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-			   TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_SUBREQ2))
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+			   TPM_PPI_REVISION_ID_1, 1 << TPM_PPI_FN_SUBREQ2))
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 		func = TPM_PPI_FN_SUBREQ2;
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132
 
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 	/*
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@@ -113,20 +136,29 @@
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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(chip->ppi_version, "1.2") < 0) {
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+	if (strcmp(chip->ppi_version, "1.3") == 0) {
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+		if (sscanf(buf, "%llu %llu", &tmp[0].integer.value,
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+			   &tmp[1].integer.value) != 2)
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+			goto ppi12;
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+		rev = TPM_PPI_REVISION_ID_2;
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+		tmp[0].type = ACPI_TYPE_INTEGER;
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+		tmp[1].type = ACPI_TYPE_INTEGER;
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+	} else if (strcmp(chip->ppi_version, "1.2") < 0) {
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 		if (sscanf(buf, "%d", &req) != 1)
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 			return -EINVAL;
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 		argv4.type = ACPI_TYPE_BUFFER;
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 		argv4.buffer.length = sizeof(req);
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 		argv4.buffer.pointer = (u8 *)&req;
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 	} else {
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-		tmp.type = ACPI_TYPE_INTEGER;
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-		if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
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+ppi12:
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+		argv4.package.count = 1;
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+		tmp[0].type = ACPI_TYPE_INTEGER;
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+		if (sscanf(buf, "%llu", &tmp[0].integer.value) != 1)
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157
 			return -EINVAL;
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 	}
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159
 
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 	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
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-			   &argv4);
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+			   &argv4, rev);
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 	if (!obj) {
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 		return -ENXIO;
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 	} else {
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@@ -170,7 +202,7 @@
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 	if (strcmp(chip->ppi_version, "1.2") < 0)
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 		obj = &tmp;
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 	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
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-			   ACPI_TYPE_INTEGER, obj);
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+			   ACPI_TYPE_INTEGER, obj, TPM_PPI_REVISION_ID_1);
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206
 	if (!obj) {
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 		return -ENXIO;
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 	} else {
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..
@@ -196,7 +228,7 @@
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228
 	struct tpm_chip *chip = to_tpm_chip(dev);
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229
 
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 	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
199
-			   ACPI_TYPE_PACKAGE, NULL);
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+			   ACPI_TYPE_PACKAGE, NULL, TPM_PPI_REVISION_ID_1);
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 	if (!obj)
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 		return -ENXIO;
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234
 
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@@ -264,7 +296,7 @@
264
296
 		"User not required",
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297
 	};
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298
 
267
-	if (!acpi_check_dsm(dev_handle, &tpm_ppi_guid, TPM_PPI_REVISION_ID,
299
+	if (!acpi_check_dsm(dev_handle, &tpm_ppi_guid, TPM_PPI_REVISION_ID_1,
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 			    1 << TPM_PPI_FN_GETOPR))
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 		return -EPERM;
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302
 
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@@ -272,7 +304,8 @@
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 	for (i = start; i <= end; i++) {
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 		tmp.integer.value = i;
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 		obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
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-				   ACPI_TYPE_INTEGER, &argv);
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+				   ACPI_TYPE_INTEGER, &argv,
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+				   TPM_PPI_REVISION_ID_1);
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 		if (!obj) {
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 			return -ENOMEM;
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311
 		} else {
..
..
@@ -338,12 +371,13 @@
338
371
 		return;
339
372
 
340
373
 	if (!acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
341
-			    TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
374
+			    TPM_PPI_REVISION_ID_1, 1 << TPM_PPI_FN_VERSION))
342
375
 		return;
343
376
 
344
377
 	/* Cache PPI version string. */
345
378
 	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, &tpm_ppi_guid,
346
-				      TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
379
+				      TPM_PPI_REVISION_ID_1,
380
+				      TPM_PPI_FN_VERSION,
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381
 				      NULL, ACPI_TYPE_STRING);
348
382
 	if (obj) {
349
383
 		strlcpy(chip->ppi_version, obj->string.pointer,