Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755906Ab2KZUJX (ORCPT ); Mon, 26 Nov 2012 15:09:23 -0500 Received: from e9.ny.us.ibm.com ([32.97.182.139]:43840 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755782Ab2KZUJV (ORCPT ); Mon, 26 Nov 2012 15:09:21 -0500 Date: Mon, 26 Nov 2012 14:08:24 -0600 From: Kent Yoder To: Jason Gunthorpe Cc: Peter H?we , Peter.Huewe@infineon.com, linux-kernel@vger.kernel.org, tpmdd-devel@lists.sourceforge.net Subject: Re: [PATCH v5] TPM: Issue TPM_STARTUP at driver load if the TPM has not been started Message-ID: <20121126200823.GB12737@ennui.austin.ibm.com> References: <74A44E99E3274B4CB570415926B37D440EAA91@MUCSE501.eu.infineon.com> <20121121183713.GA12822@obsidianresearch.com> <201211212117.55040.PeterHuewe@gmx.de> <20121121205433.GA15285@obsidianresearch.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20121121205433.GA15285@obsidianresearch.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12112620-7182-0000-0000-0000035A4925 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4607 Lines: 136 On Wed, Nov 21, 2012 at 01:54:33PM -0700, Jason Gunthorpe wrote: > The TPM will respond to TPM_GET_CAP with TPM_ERR_INVALID_POSTINIT if > TPM_STARTUP has not been issued. Detect this and automatically > issue TPM_STARTUP. > > This is for embedded applications where the kernel is the first thing > to touch the TPM. > > Signed-off-by: Jason Gunthorpe > Tested-by: Peter Huewe > Reviewed-by: Peter Huewe > --- > drivers/char/tpm/tpm.c | 44 ++++++++++++++++++++++++++++++++++++++++---- > drivers/char/tpm/tpm.h | 6 ++++++ > 2 files changed, 46 insertions(+), 4 deletions(-) > > v5 changes: > - Use %zd for printing ssize_t Applied! Thanks, Kent > > diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c > index 93211df..433ad6b 100644 > --- a/drivers/char/tpm/tpm.c > +++ b/drivers/char/tpm/tpm.c > @@ -468,7 +468,7 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd, > return -EFAULT; > > err = be32_to_cpu(cmd->header.out.return_code); > - if (err != 0) > + if (err != 0 && desc) > dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); > > return err; > @@ -528,6 +528,25 @@ void tpm_gen_interrupt(struct tpm_chip *chip) > } > EXPORT_SYMBOL_GPL(tpm_gen_interrupt); > > +#define TPM_ORD_STARTUP cpu_to_be32(153) > +#define TPM_ST_CLEAR cpu_to_be16(1) > +#define TPM_ST_STATE cpu_to_be16(2) > +#define TPM_ST_DEACTIVATED cpu_to_be16(3) > +static const struct tpm_input_header tpm_startup_header = { > + .tag = TPM_TAG_RQU_COMMAND, > + .length = cpu_to_be32(12), > + .ordinal = TPM_ORD_STARTUP > +}; > + > +static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) > +{ > + struct tpm_cmd_t start_cmd; > + start_cmd.header.in = tpm_startup_header; > + start_cmd.params.startup_in.startup_type = startup_type; > + return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, > + "attempting to start the TPM"); > +} > + > int tpm_get_timeouts(struct tpm_chip *chip) > { > struct tpm_cmd_t tpm_cmd; > @@ -541,11 +560,28 @@ int tpm_get_timeouts(struct tpm_chip *chip) > tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; > tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); > tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; > + rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL); > > - rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, > - "attempting to determine the timeouts"); > - if (rc) > + if (rc == TPM_ERR_INVALID_POSTINIT) { > + /* The TPM is not started, we are the first to talk to it. > + Execute a startup command. */ > + dev_info(chip->dev, "Issuing TPM_STARTUP"); > + if (tpm_startup(chip, TPM_ST_CLEAR)) > + return rc; > + > + tpm_cmd.header.in = tpm_getcap_header; > + tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; > + tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); > + tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; > + rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, > + NULL); > + } > + if (rc) { > + dev_err(chip->dev, > + "A TPM error (%zd) occurred attempting to determine the timeouts\n", > + rc); > goto duration; > + } > > if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 || > be32_to_cpu(tpm_cmd.header.out.length) > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h > index 8ef7649..8971b12 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -47,6 +47,7 @@ enum tpm_addr { > #define TPM_WARN_DOING_SELFTEST 0x802 > #define TPM_ERR_DEACTIVATED 0x6 > #define TPM_ERR_DISABLED 0x7 > +#define TPM_ERR_INVALID_POSTINIT 38 > > #define TPM_HEADER_SIZE 10 > extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, > @@ -291,6 +292,10 @@ struct tpm_getrandom_in { > __be32 num_bytes; > }__attribute__((packed)); > > +struct tpm_startup_in { > + __be16 startup_type; > +} __packed; > + > typedef union { > struct tpm_getcap_params_out getcap_out; > struct tpm_readpubek_params_out readpubek_out; > @@ -301,6 +306,7 @@ typedef union { > struct tpm_pcrextend_in pcrextend_in; > struct tpm_getrandom_in getrandom_in; > struct tpm_getrandom_out getrandom_out; > + struct tpm_startup_in startup_in; > } tpm_cmd_params; > > struct tpm_cmd_t { > -- > 1.7.5.4 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/