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tpm: get tpm event log from bloblist

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Get tpm event log from bloblist instead of FDT when bloblist is
enabled and valid from previous boot stage.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Raymond Mao 2025-01-27 06:49:36 -08:00 • committed by Ilias Apalodimas
parent afe26a74dd
commit 8895ff8ae2
1 changed files with 40 additions and 21 deletions
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61
lib/tpm_tcg2.c
View file

@ -19,6 +19,7 @@
#include <linux/unaligned/generic.h>
#include <linux/unaligned/le_byteshift.h>
#include "tpm-utils.h"
#include <bloblist.h>
int tcg2_get_pcr_info(struct udevice *dev, u32 *supported_bank, u32 *active_bank,
u32 *bank_num)
@ -654,21 +655,42 @@ void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
__weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size)
{
const __be32 *addr_prop;
const __be32 *size_prop;
const __be32 *addr_prop = NULL;
const __be32 *size_prop = NULL;
int asize;
int ssize;
struct ofnode_phandle_args args;
phys_addr_t a;
fdt_size_t s;
*addr = NULL;
*size = 0;
addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize);
if (!addr_prop)
addr_prop = dev_read_prop(dev, "linux,sml-base", &asize);
*addr = bloblist_get_blob(BLOBLISTT_TPM_EVLOG, size);
if (*addr && *size) {
*addr = map_physmem((uintptr_t)(*addr), *size, MAP_NOCACHE);
return 0;
}
size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize);
if (!size_prop)
/*
* TODO:
* Replace BLOBLIST with a new kconfig for handoff all components
* (fdt, tpm event log, etc...) from previous boot stage via bloblist
* mandatorily following Firmware Handoff spec.
*/
if (!CONFIG_IS_ENABLED(BLOBLIST)) {
addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize);
size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize);
}
/*
* If no eventlog was observed, a sml buffer is required for the kernel
* to discover the eventlog.
*/
if (!addr_prop || !size_prop) {
addr_prop = dev_read_prop(dev, "linux,sml-base", &asize);
size_prop = dev_read_prop(dev, "linux,sml-size", &ssize);
}
if (addr_prop && size_prop) {
u64 a = of_read_number(addr_prop, asize / sizeof(__be32));
@ -676,23 +698,20 @@ __weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size)
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
} else {
struct ofnode_phandle_args args;
phys_addr_t a;
fdt_size_t s;
if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0,
0, &args))
return -ENODEV;
a = ofnode_get_addr_size(args.node, "reg", &s);
if (a == FDT_ADDR_T_NONE)
return -ENOMEM;
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
return 0;
}
if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0, 0, &args))
return -ENODEV;
a = ofnode_get_addr_size(args.node, "reg", &s);
if (a == FDT_ADDR_T_NONE)
return -ENOMEM;
*addr = map_physmem(a, s, MAP_NOCACHE);
*size = (u32)s;
return 0;
}