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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2012 IBM Corporation4 *5 * Author: Ashley Lai <ashleydlai@gmail.com>6 * Nayna Jain <nayna@linux.vnet.ibm.com>7 *8 * Maintained by: <tpmdd-devel@lists.sourceforge.net>9 *10 * Read the event log created by the firmware on PPC6411 */12 13#include <linux/device.h>14#include <linux/slab.h>15#include <linux/io.h>16#include <linux/ioport.h>17#include <linux/of.h>18#include <linux/of_address.h>19#include <linux/of_reserved_mem.h>20#include <linux/tpm_eventlog.h>21 22#include "../tpm.h"23#include "common.h"24 25static int tpm_read_log_memory_region(struct tpm_chip *chip)26{27 struct device_node *node;28 struct resource res;29 int rc;30 31 node = of_parse_phandle(chip->dev.parent->of_node, "memory-region", 0);32 if (!node)33 return -ENODEV;34 35 rc = of_address_to_resource(node, 0, &res);36 of_node_put(node);37 if (rc)38 return rc;39 40 chip->log.bios_event_log = devm_memremap(&chip->dev, res.start, resource_size(&res),41 MEMREMAP_WB);42 if (IS_ERR(chip->log.bios_event_log))43 return -ENOMEM;44 45 chip->log.bios_event_log_end = chip->log.bios_event_log + resource_size(&res);46 47 return chip->flags & TPM_CHIP_FLAG_TPM2 ? EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 :48 EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;49}50 51int tpm_read_log_of(struct tpm_chip *chip)52{53 struct device_node *np;54 const u32 *sizep;55 const u64 *basep;56 struct tpm_bios_log *log;57 u32 size;58 u64 base;59 60 log = &chip->log;61 if (chip->dev.parent && chip->dev.parent->of_node)62 np = chip->dev.parent->of_node;63 else64 return -ENODEV;65 66 if (of_property_read_bool(np, "powered-while-suspended"))67 chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;68 69 sizep = of_get_property(np, "linux,sml-size", NULL);70 basep = of_get_property(np, "linux,sml-base", NULL);71 if (sizep == NULL && basep == NULL)72 return tpm_read_log_memory_region(chip);73 if (sizep == NULL || basep == NULL)74 return -EIO;75 76 /*77 * For both vtpm/tpm, firmware has log addr and log size in big78 * endian format. But in case of vtpm, there is a method called79 * sml-handover which is run during kernel init even before80 * device tree is setup. This sml-handover function takes care81 * of endianness and writes to sml-base and sml-size in little82 * endian format. For this reason, vtpm doesn't need conversion83 * but physical tpm needs the conversion.84 */85 if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 &&86 of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {87 size = be32_to_cpup((__force __be32 *)sizep);88 base = be64_to_cpup((__force __be64 *)basep);89 } else {90 size = *sizep;91 base = *basep;92 }93 94 if (size == 0) {95 dev_warn(&chip->dev, "%s: Event log area empty\n", __func__);96 return -EIO;97 }98 99 log->bios_event_log = devm_kmemdup(&chip->dev, __va(base), size, GFP_KERNEL);100 if (!log->bios_event_log)101 return -ENOMEM;102 103 log->bios_event_log_end = log->bios_event_log + size;104 105 if (chip->flags & TPM_CHIP_FLAG_TPM2)106 return EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;107 return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;108}109