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tpm: Add support for event log pointer found in TPM2 ACPI table
In case a TPM2 is attached, search for a TPM2 ACPI table when trying to get the event log from ACPI. If one is found, use it to get the start and length of the log area. This allows non-UEFI systems, such as SeaBIOS, to pass an event log when using a TPM2. Cc: Peter Huewe <peterhuewe@gmx.de> Cc: Jason Gunthorpe <jgg@ziepe.ca> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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@ -49,9 +49,9 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
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void __iomem *virt;
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u64 len, start;
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struct tpm_bios_log *log;
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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return -ENODEV;
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struct acpi_table_tpm2 *tbl;
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struct acpi_tpm2_phy *tpm2_phy;
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int format;
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log = &chip->log;
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@ -61,23 +61,44 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
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if (!chip->acpi_dev_handle)
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return -ENODEV;
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/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
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status = acpi_get_table(ACPI_SIG_TCPA, 1,
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(struct acpi_table_header **)&buff);
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if (chip->flags & TPM_CHIP_FLAG_TPM2) {
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status = acpi_get_table("TPM2", 1,
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(struct acpi_table_header **)&tbl);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (tbl->header.length <
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sizeof(*tbl) + sizeof(struct acpi_tpm2_phy))
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return -ENODEV;
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switch(buff->platform_class) {
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case BIOS_SERVER:
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len = buff->server.log_max_len;
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start = buff->server.log_start_addr;
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break;
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case BIOS_CLIENT:
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default:
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len = buff->client.log_max_len;
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start = buff->client.log_start_addr;
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break;
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tpm2_phy = (void *)tbl + sizeof(*tbl);
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len = tpm2_phy->log_area_minimum_length;
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start = tpm2_phy->log_area_start_address;
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if (!start || !len)
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return -ENODEV;
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format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
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} else {
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/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
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status = acpi_get_table(ACPI_SIG_TCPA, 1,
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(struct acpi_table_header **)&buff);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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switch (buff->platform_class) {
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case BIOS_SERVER:
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len = buff->server.log_max_len;
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start = buff->server.log_start_addr;
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break;
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case BIOS_CLIENT:
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default:
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len = buff->client.log_max_len;
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start = buff->client.log_start_addr;
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break;
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}
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format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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}
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if (!len) {
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dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
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@ -98,7 +119,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
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memcpy_fromio(log->bios_event_log, virt, len);
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acpi_os_unmap_iomem(virt, len);
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return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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return format;
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err:
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kfree(log->bios_event_log);
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