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Skiboot detects if tpm is present by checking if a secureboot_tpm_info
entry exists. However, if a tpm is not present, hostboot also creates a
secureboot_tpm_info entry. In this case, hostboot creates an empty
entry, but setting the field tpm_status to TPM_NOT_PRESENT.
This detects if tpm is not present by looking up the stinfo->status.
This fixes the "TPMREL: TPM node not found for chip_id=0 (HB bug)"
issue, reproduced when skiboot is running on a system that has no tpm.
Signed-off-by: Claudio Carvalho <cclaudio@linux.vnet.ibm.com>
Tested-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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In P9, the Container Verification Code is stored in a hostboot reserved
memory and the list of provided CVC services is stored in the
TPMREL_IDATA_HASH_VERIF_OFFSETS idata array. Each CVC service has an
offset and version.
This adds the ibm,cvc device tree node and its documentation.
Signed-off-by: Claudio Carvalho <cclaudio@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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This parses the firmware event log information from the
secureboot_tpm_info HDAT structure and add it to the tpm device tree
node.
There can be multiple secureboot_tpm_info entries with each entry
corresponding to a master processor that has a tpm device, however,
multiple tpm is not supported.
Signed-off-by: Claudio Carvalho <cclaudio@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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