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Tue, 24 Mar 2026 00:18:11 -0700 (PDT) X-Received: by 2002:a05:6a00:8d3:b0:81e:f280:f341 with SMTP id d2e1a72fcca58-82c5bd62425mr2173651b3a.6.1774336691167; Tue, 24 Mar 2026 00:18:11 -0700 (PDT) Received: from fedora.armenon-thinkpadp16vgen1.bengluru.csb ([49.36.106.26]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82b0409c681sm13597766b3a.37.2026.03.24.00.18.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 00:18:10 -0700 (PDT) From: Arun Menon To: linux-kernel@vger.kernel.org Cc: linux-integrity@vger.kernel.org, Jason Gunthorpe , Jarkko Sakkinen , Peter Huewe , Arun Menon Subject: [RFC 1/4] tpm_crb: Add definition of TPM CRB chunking fields Date: Tue, 24 Mar 2026 12:48:00 +0530 Message-ID: <20260324071803.324774-2-armenon@redhat.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260324071803.324774-1-armenon@redhat.com> References: <20260324071803.324774-1-armenon@redhat.com> Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit - Add 2 new registers for invoking the start method and add CRB_INTF_CAP_CRB_CHUNK as the new TCG TPM specifies this CRB Interface Identifier that decides if chunking is allowed. - Refer section 6.4.2.2 of the specification document [1] [1] https://trustedcomputinggroup.org/wp-content/uploads/PC-Client-Specific-Platform-TPM-Profile-for-TPM-2p0-v1p07_rc1_121225.pdf Signed-off-by: Arun Menon --- drivers/char/tpm/tpm_crb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index 6c25305c256ef..67c0061d4cab7 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -56,12 +56,18 @@ enum crb_ctrl_sts { enum crb_start { CRB_START_INVOKE = BIT(0), + CRB_START_RESP_RETRY = BIT(1), + CRB_START_NEXT_CHUNK = BIT(2), }; enum crb_cancel { CRB_CANCEL_INVOKE = BIT(0), }; +enum crb_intf { + CRB_INTF_CAP_CRB_CHUNK = BIT(10), +}; + struct crb_regs_head { u32 loc_state; u32 reserved1; -- 2.53.0