12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
20bfb2374SThiebaud Weksteen /*
30bfb2374SThiebaud Weksteen * Copyright 2012 IBM Corporation
40bfb2374SThiebaud Weksteen *
50bfb2374SThiebaud Weksteen * Author: Ashley Lai <ashleydlai@gmail.com>
60bfb2374SThiebaud Weksteen * Nayna Jain <nayna@linux.vnet.ibm.com>
70bfb2374SThiebaud Weksteen *
80bfb2374SThiebaud Weksteen * Maintained by: <tpmdd-devel@lists.sourceforge.net>
90bfb2374SThiebaud Weksteen *
100bfb2374SThiebaud Weksteen * Read the event log created by the firmware on PPC64
110bfb2374SThiebaud Weksteen */
120bfb2374SThiebaud Weksteen
13441b7152SEddie James #include <linux/device.h>
140bfb2374SThiebaud Weksteen #include <linux/slab.h>
15*1e2714bbSEddie James #include <linux/io.h>
16*1e2714bbSEddie James #include <linux/ioport.h>
170bfb2374SThiebaud Weksteen #include <linux/of.h>
18*1e2714bbSEddie James #include <linux/of_address.h>
19*1e2714bbSEddie James #include <linux/of_reserved_mem.h>
200bfb2374SThiebaud Weksteen #include <linux/tpm_eventlog.h>
210bfb2374SThiebaud Weksteen
220bfb2374SThiebaud Weksteen #include "../tpm.h"
2375d647f5SThiebaud Weksteen #include "common.h"
240bfb2374SThiebaud Weksteen
tpm_read_log_memory_region(struct tpm_chip * chip)25*1e2714bbSEddie James static int tpm_read_log_memory_region(struct tpm_chip *chip)
26*1e2714bbSEddie James {
27*1e2714bbSEddie James struct device_node *node;
28*1e2714bbSEddie James struct resource res;
29*1e2714bbSEddie James int rc;
30*1e2714bbSEddie James
31*1e2714bbSEddie James node = of_parse_phandle(chip->dev.parent->of_node, "memory-region", 0);
32*1e2714bbSEddie James if (!node)
33*1e2714bbSEddie James return -ENODEV;
34*1e2714bbSEddie James
35*1e2714bbSEddie James rc = of_address_to_resource(node, 0, &res);
36*1e2714bbSEddie James of_node_put(node);
37*1e2714bbSEddie James if (rc)
38*1e2714bbSEddie James return rc;
39*1e2714bbSEddie James
40*1e2714bbSEddie James chip->log.bios_event_log = devm_memremap(&chip->dev, res.start, resource_size(&res),
41*1e2714bbSEddie James MEMREMAP_WB);
42*1e2714bbSEddie James if (IS_ERR(chip->log.bios_event_log))
43*1e2714bbSEddie James return -ENOMEM;
44*1e2714bbSEddie James
45*1e2714bbSEddie James chip->log.bios_event_log_end = chip->log.bios_event_log + resource_size(&res);
46*1e2714bbSEddie James
47*1e2714bbSEddie James return chip->flags & TPM_CHIP_FLAG_TPM2 ? EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 :
48*1e2714bbSEddie James EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
49*1e2714bbSEddie James }
50*1e2714bbSEddie James
tpm_read_log_of(struct tpm_chip * chip)510bfb2374SThiebaud Weksteen int tpm_read_log_of(struct tpm_chip *chip)
520bfb2374SThiebaud Weksteen {
530bfb2374SThiebaud Weksteen struct device_node *np;
540bfb2374SThiebaud Weksteen const u32 *sizep;
550bfb2374SThiebaud Weksteen const u64 *basep;
560bfb2374SThiebaud Weksteen struct tpm_bios_log *log;
570bfb2374SThiebaud Weksteen u32 size;
580bfb2374SThiebaud Weksteen u64 base;
590bfb2374SThiebaud Weksteen
600bfb2374SThiebaud Weksteen log = &chip->log;
610bfb2374SThiebaud Weksteen if (chip->dev.parent && chip->dev.parent->of_node)
620bfb2374SThiebaud Weksteen np = chip->dev.parent->of_node;
630bfb2374SThiebaud Weksteen else
640bfb2374SThiebaud Weksteen return -ENODEV;
650bfb2374SThiebaud Weksteen
660bfb2374SThiebaud Weksteen if (of_property_read_bool(np, "powered-while-suspended"))
670bfb2374SThiebaud Weksteen chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
680bfb2374SThiebaud Weksteen
690bfb2374SThiebaud Weksteen sizep = of_get_property(np, "linux,sml-size", NULL);
700bfb2374SThiebaud Weksteen basep = of_get_property(np, "linux,sml-base", NULL);
710bfb2374SThiebaud Weksteen if (sizep == NULL && basep == NULL)
72*1e2714bbSEddie James return tpm_read_log_memory_region(chip);
730bfb2374SThiebaud Weksteen if (sizep == NULL || basep == NULL)
740bfb2374SThiebaud Weksteen return -EIO;
750bfb2374SThiebaud Weksteen
760bfb2374SThiebaud Weksteen /*
770bfb2374SThiebaud Weksteen * For both vtpm/tpm, firmware has log addr and log size in big
780bfb2374SThiebaud Weksteen * endian format. But in case of vtpm, there is a method called
790bfb2374SThiebaud Weksteen * sml-handover which is run during kernel init even before
800bfb2374SThiebaud Weksteen * device tree is setup. This sml-handover function takes care
810bfb2374SThiebaud Weksteen * of endianness and writes to sml-base and sml-size in little
820bfb2374SThiebaud Weksteen * endian format. For this reason, vtpm doesn't need conversion
830bfb2374SThiebaud Weksteen * but physical tpm needs the conversion.
840bfb2374SThiebaud Weksteen */
855cb2ace9SStefan Berger if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 &&
865cb2ace9SStefan Berger of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {
870bfb2374SThiebaud Weksteen size = be32_to_cpup((__force __be32 *)sizep);
880bfb2374SThiebaud Weksteen base = be64_to_cpup((__force __be64 *)basep);
890bfb2374SThiebaud Weksteen } else {
900bfb2374SThiebaud Weksteen size = *sizep;
910bfb2374SThiebaud Weksteen base = *basep;
920bfb2374SThiebaud Weksteen }
930bfb2374SThiebaud Weksteen
940bfb2374SThiebaud Weksteen if (size == 0) {
950bfb2374SThiebaud Weksteen dev_warn(&chip->dev, "%s: Event log area empty\n", __func__);
960bfb2374SThiebaud Weksteen return -EIO;
970bfb2374SThiebaud Weksteen }
980bfb2374SThiebaud Weksteen
99441b7152SEddie James log->bios_event_log = devm_kmemdup(&chip->dev, __va(base), size, GFP_KERNEL);
1000bfb2374SThiebaud Weksteen if (!log->bios_event_log)
1010bfb2374SThiebaud Weksteen return -ENOMEM;
1020bfb2374SThiebaud Weksteen
1030bfb2374SThiebaud Weksteen log->bios_event_log_end = log->bios_event_log + size;
1040bfb2374SThiebaud Weksteen
1050bfb2374SThiebaud Weksteen if (chip->flags & TPM_CHIP_FLAG_TPM2)
1060bfb2374SThiebaud Weksteen return EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
1070bfb2374SThiebaud Weksteen return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
1080bfb2374SThiebaud Weksteen }
109