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Tue, 24 Mar 2026 11:12:54 -0700 (PDT) X-Received: by 2002:a05:6a00:3924:b0:829:7d31:dd99 with SMTP id d2e1a72fcca58-82c6e0eb05bmr509150b3a.38.1774375974343; Tue, 24 Mar 2026 11:12:54 -0700 (PDT) Received: from fedora.armenon-thinkpadp16vgen1.bengluru.csb ([49.36.108.16]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82b0410b1bdsm16654229b3a.57.2026.03.24.11.12.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 11:12:54 -0700 (PDT) From: Arun Menon To: linux-kernel@vger.kernel.org Cc: Jarkko Sakkinen , linux-integrity@vger.kernel.org, Peter Huewe , Jason Gunthorpe , Arun Menon Subject: [RFC v2 2/5] tpm_crb: Add new wrapper function to invoke start method Date: Tue, 24 Mar 2026 23:42:41 +0530 Message-ID: <20260324181244.17741-3-armenon@redhat.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260324181244.17741-1-armenon@redhat.com> References: <20260324181244.17741-1-armenon@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The current implementation handles different platform start methods (ACPI, ARM SMC, and ARM FFA) directly within crb_send(), but it is limited to triggering the CRB_START_INVOKE bit. To support cmd/rsp chunking, the driver must be able to send other control bits, like CRB_START_NEXT_CHUNK, using these same platform-specific paths. By moving this logic into a new helper function, crb_trigger_tpm(), the driver can now send any required control bit across all supported platforms. This prepares the driver for the upcoming chunking support. No functional change is intended. Signed-off-by: Arun Menon --- drivers/char/tpm/tpm_crb.c | 50 ++++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 23 deletions(-) diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index 67c0061d4cab7..922bcf7a69ad5 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -445,6 +445,32 @@ static int tpm_crb_smc_start(struct device *dev, unsig= ned long func_id) } #endif =20 +static int crb_trigger_tpm(struct tpm_chip *chip, u32 start_cmd) +{ + struct crb_priv *priv =3D dev_get_drvdata(&chip->dev); + int rc =3D 0; + /* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs + * report only ACPI start but in practice seems to require both + * CRB start, hence invoking CRB start method if hid =3D=3D MSFT0101. + */ + if (priv->sm =3D=3D ACPI_TPM2_COMMAND_BUFFER || + priv->sm =3D=3D ACPI_TPM2_MEMORY_MAPPED || + !strcmp(priv->hid, "MSFT0101")) + iowrite32(start_cmd, &priv->regs_t->ctrl_start); + if (priv->sm =3D=3D ACPI_TPM2_START_METHOD || + priv->sm =3D=3D ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) + rc =3D crb_do_acpi_start(chip); + if (priv->sm =3D=3D ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { + iowrite32(start_cmd, &priv->regs_t->ctrl_start); + rc =3D tpm_crb_smc_start(&chip->dev, priv->smc_func_id); + } + if (priv->sm =3D=3D ACPI_TPM2_CRB_WITH_ARM_FFA) { + iowrite32(start_cmd, &priv->regs_t->ctrl_start); + rc =3D tpm_crb_ffa_start(CRB_FFA_START_TYPE_COMMAND, chip->locality); + } + return rc; +} + static int crb_send(struct tpm_chip *chip, u8 *buf, size_t bufsiz, size_t = len) { struct crb_priv *priv =3D dev_get_drvdata(&chip->dev); @@ -470,29 +496,7 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, si= ze_t bufsiz, size_t len) /* Make sure that cmd is populated before issuing start. */ wmb(); =20 - /* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs - * report only ACPI start but in practice seems to require both - * CRB start, hence invoking CRB start method if hid =3D=3D MSFT0101. - */ - if (priv->sm =3D=3D ACPI_TPM2_COMMAND_BUFFER || - priv->sm =3D=3D ACPI_TPM2_MEMORY_MAPPED || - !strcmp(priv->hid, "MSFT0101")) - iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); - - if (priv->sm =3D=3D ACPI_TPM2_START_METHOD || - priv->sm =3D=3D ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) - rc =3D crb_do_acpi_start(chip); - - if (priv->sm =3D=3D ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { - iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); - rc =3D tpm_crb_smc_start(&chip->dev, priv->smc_func_id); - } - - if (priv->sm =3D=3D ACPI_TPM2_CRB_WITH_ARM_FFA) { - iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start); - rc =3D tpm_crb_ffa_start(CRB_FFA_START_TYPE_COMMAND, chip->locality); - } - + rc =3D crb_trigger_tpm(chip, CRB_START_INVOKE); if (rc) return rc; =20 --=20 2.53.0