diff options
| author | Eddie James <eajames@linux.ibm.com> | 2023-01-26 15:08:10 -0600 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2023-02-13 10:11:20 +0200 |
| commit | 1e2714bb83fc783d58701967391bea242c65eaff (patch) | |
| tree | 239a6ca8dc4433d9728f02ab7ef8e05829d9e6af /drivers/char/tpm | |
| parent | 441b7152729f4a2bdb100135a58625fa0aeb69e4 (diff) | |
| download | linux-1e2714bb83fc783d58701967391bea242c65eaff.tar.gz | |
tpm: Add reserved memory event log
Some platforms may desire to pass the event log up to Linux in the
form of a reserved memory region. In particular, this is desirable
for embedded systems or baseboard management controllers (BMCs)
booting with U-Boot. IBM OpenBMC BMCs will be the first user.
Add support for the reserved memory in the TPM core to find the
region and map it.
Signed-off-by: Eddie James <eajames@linux.ibm.com>
[jarkko: removed spurious dev_info()'s from tpm_read_log_memory_region()]
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
[yang: return -ENOMEM when devm_memremap() fails]
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'drivers/char/tpm')
| -rw-r--r-- | drivers/char/tpm/eventlog/of.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c index 741ab2204b11a..930fe43d5dafa 100644 --- a/drivers/char/tpm/eventlog/of.c +++ b/drivers/char/tpm/eventlog/of.c @@ -12,12 +12,42 @@ #include <linux/device.h> #include <linux/slab.h> +#include <linux/io.h> +#include <linux/ioport.h> #include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_reserved_mem.h> #include <linux/tpm_eventlog.h> #include "../tpm.h" #include "common.h" +static int tpm_read_log_memory_region(struct tpm_chip *chip) +{ + struct device_node *node; + struct resource res; + int rc; + + node = of_parse_phandle(chip->dev.parent->of_node, "memory-region", 0); + if (!node) + return -ENODEV; + + rc = of_address_to_resource(node, 0, &res); + of_node_put(node); + if (rc) + return rc; + + chip->log.bios_event_log = devm_memremap(&chip->dev, res.start, resource_size(&res), + MEMREMAP_WB); + if (IS_ERR(chip->log.bios_event_log)) + return -ENOMEM; + + chip->log.bios_event_log_end = chip->log.bios_event_log + resource_size(&res); + + return chip->flags & TPM_CHIP_FLAG_TPM2 ? EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 : + EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; +} + int tpm_read_log_of(struct tpm_chip *chip) { struct device_node *np; @@ -39,7 +69,7 @@ int tpm_read_log_of(struct tpm_chip *chip) sizep = of_get_property(np, "linux,sml-size", NULL); basep = of_get_property(np, "linux,sml-base", NULL); if (sizep == NULL && basep == NULL) - return -ENODEV; + return tpm_read_log_memory_region(chip); if (sizep == NULL || basep == NULL) return -EIO; |