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Date: Thu, 21 Jun 2018 18:40:50 +0000
From: "Winkler, Tomas" <tomas.winkler@...el.com>
To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
CC: Jason Gunthorpe <jgg@...pe.ca>,
"Usyskin, Alexander" <alexander.usyskin@...el.com>,
"linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
"linux-security-module@...r.kernel.org"
<linux-security-module@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v6] tpm: separate cmd_ready/go_idle from runtime_pm
>
> On Mon, Jun 18, 2018 at 07:24:39PM +0000, Winkler, Tomas wrote:
> > >
> > > On Fri, Jun 08, 2018 at 12:20:40AM +0300, Tomas Winkler wrote:
> > > > We cannot use go_idle cmd_ready commands via runtime_pm handles
> as
> > > > with the introduction of localities this is no longer an optional
> > > > feature, while runtime pm can be not enabled.
> > > > Though cmd_ready/go_idle provides a power saving, it's also a part
> > > > of
> > > > TPM2 protocol and should be called explicitly.
> > > > This patch exposes cmd_read/go_idle via tpm class ops and removes
> > > > runtime pm support as it is not used by any driver.
> > > >
> > > > A new tpm transmit flag is added TPM_TRANSMIT_NESTED, which
> > > > implies TPM_TRANSMIT_UNLOCKED and TPM_TRANSMIT_RAW. Both
> are
> > > > needed
> > > to resolve
> > > > tpm spaces and locality request recursive calls to tpm_transmit().
> > > >
> > > > New wrappers are added tpm_cmd_ready() and tpm_go_idle() to
> > > streamline
> > > > tpm_try_transmit code.
> > > >
> > > > tpm_crb no longer needs own power saving functions and can drop
> > > > using tpm_pm_suspend/resume.
> > > >
> > > > This patch cannot be really separated from the locality fix.
> > > > Fixes: 888d867df441 (tpm: cmd_ready command can be issued only
> > > > after granting locality)
> > > >
> > > >
> > > > Cc: stable@...r.kernel.org
> > > > Fixes: 888d867df441 (tpm: cmd_ready command can be issued only
> > > > after granting locality)
> > > > Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> > > > ---
> > > > V2-3:resent
> > > > V4: 1. Use tpm_pm_suspend/resume in tpm_crb
> > > > 2. Drop cmd_ready/go_idle around tpm_chip_register, as there is no
> > > > usage counter like in runtime_pm.
> > > > V5: 1. add tpm_cmd_ready and tpm_go_idle wrappers.
> > > > 2. Abuse TPM_TRANSMIT_UNLOCKED flag to resolve tpm space
> > > > recursion.
> > > > V6: 1. Add new flags TPM_TRANSMIT_NESTED which implies
> > > > TPM_TRANSMIT_UNLOCKED and TPM_TRANSMIT_RAW, as not all
> > > > unlocked flows are recursive i.e. tpm2_unseal_trusted.
> > > >
> > > > drivers/char/tpm/tpm-interface.c | 51 +++++++++++++++----
> > > > drivers/char/tpm/tpm.h | 13 ++++-
> > > > drivers/char/tpm/tpm2-space.c | 12 ++---
> > > > drivers/char/tpm/tpm_crb.c | 101 ++++++++++----------------------------
> > > > drivers/char/tpm/tpm_vtpm_proxy.c | 2 +-
> > > > include/linux/tpm.h | 2 +
> > > > 6 files changed, 88 insertions(+), 93 deletions(-)
> > > >
> > > > diff --git a/drivers/char/tpm/tpm-interface.c
> > > > b/drivers/char/tpm/tpm-interface.c
> > > > index e32f6e85dc6d..1abd8261651b 100644
> > > > --- a/drivers/char/tpm/tpm-interface.c
> > > > +++ b/drivers/char/tpm/tpm-interface.c
> > > > @@ -29,7 +29,6 @@
> > > > #include <linux/mutex.h>
> > > > #include <linux/spinlock.h>
> > > > #include <linux/freezer.h>
> > > > -#include <linux/pm_runtime.h>
> > > > #include <linux/tpm_eventlog.h>
> > > >
> > > > #include "tpm.h"
> > > > @@ -369,10 +368,13 @@ static int tpm_validate_command(struct
> > > tpm_chip *chip,
> > > > return -EINVAL;
> > > > }
> > > >
> > > > -static int tpm_request_locality(struct tpm_chip *chip)
> > > > +static int tpm_request_locality(struct tpm_chip *chip, unsigned
> > > > +int
> > > > +flags)
> > > > {
> > > > int rc;
> > > >
> > > > + if (flags & __TPM_TRANSMIT_RAW)
> > > > + return 0;
> > > > +
> > > > if (!chip->ops->request_locality)
> > > > return 0;
> > > >
> > > > @@ -385,10 +387,13 @@ static int tpm_request_locality(struct
> > > > tpm_chip
> > > *chip)
> > > > return 0;
> > > > }
> > > >
> > > > -static void tpm_relinquish_locality(struct tpm_chip *chip)
> > > > +static void tpm_relinquish_locality(struct tpm_chip *chip,
> > > > +unsigned int flags)
> > > > {
> > > > int rc;
> > > >
> > > > + if (flags & __TPM_TRANSMIT_RAW)
> > > > + return;
> > > > +
> > > > if (!chip->ops->relinquish_locality)
> > > > return;
> > > >
> > > > @@ -399,6 +404,28 @@ static void tpm_relinquish_locality(struct
> > > tpm_chip *chip)
> > > > chip->locality = -1;
> > > > }
> > > >
> > > > +static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags) {
> > > > + if (flags & __TPM_TRANSMIT_RAW)
> > > > + return 0;
> > > > +
> > > > + if (!chip->ops->cmd_ready)
> > > > + return 0;
> > > > +
> > > > + return chip->ops->cmd_ready(chip); }
> > > > +
> > > > +static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags) {
> > > > + if (flags & __TPM_TRANSMIT_RAW)
> > > > + return 0;
> > > > +
> > > > + if (!chip->ops->go_idle)
> > > > + return 0;
> > > > +
> > > > + return chip->ops->go_idle(chip); }
> > > > +
> > > > static ssize_t tpm_try_transmit(struct tpm_chip *chip,
> > > > struct tpm_space *space,
> > > > u8 *buf, size_t bufsiz,
> > > > @@ -449,14 +476,15 @@ static ssize_t tpm_try_transmit(struct
> > > > tpm_chip
> > > *chip,
> > > > /* Store the decision as chip->locality will be changed. */
> > > > need_locality = chip->locality == -1;
> > > >
> > > > - if (!(flags & TPM_TRANSMIT_RAW) && need_locality) {
> > > > - rc = tpm_request_locality(chip);
> > > > + if (need_locality) {
> > > > + rc = tpm_request_locality(chip, flags);
> > > > if (rc < 0)
> > > > goto out_no_locality;
> > > > }
> > > >
> > > > - if (chip->dev.parent)
> > > > - pm_runtime_get_sync(chip->dev.parent);
> > > > + rc = tpm_cmd_ready(chip, flags);
> > > > + if (rc)
> > > > + goto out;
> > > >
> > > > rc = tpm2_prepare_space(chip, space, ordinal, buf);
> > > > if (rc)
> > > > @@ -516,13 +544,16 @@ static ssize_t tpm_try_transmit(struct
> > > > tpm_chip
> > > *chip,
> > > > }
> > > >
> > > > rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
> > > > + if (rc)
> > > > + dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc);
> > > >
> > > > out:
> > > > - if (chip->dev.parent)
> > > > - pm_runtime_put_sync(chip->dev.parent);
> > > > + rc = tpm_go_idle(chip, flags);
> > > > + if (rc)
> > > > + goto out;
> > > >
> > > > if (need_locality)
> > > > - tpm_relinquish_locality(chip);
> > > > + tpm_relinquish_locality(chip, flags);
> > > >
> > > > out_no_locality:
> > > > if (chip->ops->clk_enable != NULL) diff --git
> > > > a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index
> > > > 4426649e431c..beb0a763016c 100644
> > > > --- a/drivers/char/tpm/tpm.h
> > > > +++ b/drivers/char/tpm/tpm.h
> > > > @@ -511,9 +511,18 @@ extern const struct file_operations tpm_fops;
> > > > extern const struct file_operations tpmrm_fops; extern struct idr
> > > > dev_nums_idr;
> > > >
> > > > +/**
> > > > + * enum tpm_transmit_flags
> > > > + *
> > > > + * @TPM_TRANSMIT_UNLOCKED: used to lock sequence of
> tpm_transmit
> > > calls.
> > > > + * @__TPM_TRANSMIT_RAW: prevent recursive calls into setup steps
> > > > + * (go idle, locality,..). Don't use directly.
> > > > + * @TPM_TRANSMIT_NESTED: Use from nested tpm_transmit calls */
> > > > enum tpm_transmit_flags {
> > > > - TPM_TRANSMIT_UNLOCKED = BIT(0),
> > > > - TPM_TRANSMIT_RAW = BIT(1),
> > > > + TPM_TRANSMIT_UNLOCKED = BIT(0),
> > > > + __TPM_TRANSMIT_RAW = BIT(1),
> > >
> > > NAK for the naming convention.
> >
> > What do you suggest
> > Tomas
>
> Just keeping the same name.
I just wanted to make sure that 'RAW' not used in the api directly, it will break the flow, do have any suggestion to make it obvious.
Thanks
Tomas
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