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From:   Dan Williams <dan.j.williams@intel.com>
Date:   Mon, 23 Dec 2019 11:46:53 -0800
Message-ID: <CAPcyv4jfpOX85GWgNTyugWksU=e-j=RhU_fcrcHBo4GMZ8_bhw@mail.gmail.com>
Subject: Re: Patch "tpm_tis: reserve chip for duration of tpm_tis_core_init"
 has been added to the 5.4-stable tree
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Christian Bundy <christianbundy@fraction.io>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Jerry Snitselaar <jsnitsel@redhat.com>,
        Peter Huewe <peterhuewe@gmx.de>,
        Stefan Berger <stefanb@linux.vnet.ibm.com>,
        stable-commits@vger.kernel.org, linux-integrity@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Hi Greg,

Please drop the:

   Fixes: 5b359c7c4372 ("tpm_tis_core: Turn on the TPM before probing IRQ's")

...tag. I had asked Jarkko to do that here:

https://lore.kernel.org/r/CAPcyv4h60z889bfbiwvVhsj6MxmOPiPY8ZuPB_skxkZx-N+OGw@mail.gmail.com/

...but it didn't get picked up.

On Mon, Dec 23, 2019 at 9:37 AM <gregkh@linuxfoundation.org> wrote:
>
>
> This is a note to let you know that I've just added the patch titled
>
>     tpm_tis: reserve chip for duration of tpm_tis_core_init
>
> to the 5.4-stable tree which can be found at:
>     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>
> The filename of the patch is:
>      tpm_tis-reserve-chip-for-duration-of-tpm_tis_core_init.patch
> and it can be found in the queue-5.4 subdirectory.
>
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
>
>
> From 21df4a8b6018b842d4db181a8b24166006bad3cd Mon Sep 17 00:00:00 2001
> From: Jerry Snitselaar <jsnitsel@redhat.com>
> Date: Wed, 11 Dec 2019 16:54:55 -0700
> Subject: tpm_tis: reserve chip for duration of tpm_tis_core_init
>
> From: Jerry Snitselaar <jsnitsel@redhat.com>
>
> commit 21df4a8b6018b842d4db181a8b24166006bad3cd upstream.
>
> Instead of repeatedly calling tpm_chip_start/tpm_chip_stop when
> issuing commands to the tpm during initialization, just reserve the
> chip after wait_startup, and release it when we are ready to call
> tpm_chip_register.
>
> Cc: Christian Bundy <christianbundy@fraction.io>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Peter Huewe <peterhuewe@gmx.de>
> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: Stefan Berger <stefanb@linux.vnet.ibm.com>
> Cc: stable@vger.kernel.org
> Cc: linux-integrity@vger.kernel.org
> Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
> Fixes: 5b359c7c4372 ("tpm_tis_core: Turn on the TPM before probing IRQ's")
> Suggested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
> ---
>  drivers/char/tpm/tpm_tis_core.c |   35 ++++++++++++++++++-----------------
>  1 file changed, 18 insertions(+), 17 deletions(-)
>
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -899,13 +899,13 @@ int tpm_tis_core_init(struct device *dev
>
>         if (wait_startup(chip, 0) != 0) {
>                 rc = -ENODEV;
> -               goto out_err;
> +               goto err_start;
>         }
>
>         /* Take control of the TPM's interrupt hardware and shut it off */
>         rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
>         if (rc < 0)
> -               goto out_err;
> +               goto err_start;
>
>         intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
>                    TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
> @@ -914,21 +914,21 @@ int tpm_tis_core_init(struct device *dev
>
>         rc = tpm_chip_start(chip);
>         if (rc)
> -               goto out_err;
> +               goto err_start;
> +
>         rc = tpm2_probe(chip);
> -       tpm_chip_stop(chip);
>         if (rc)
> -               goto out_err;
> +               goto err_probe;
>
>         rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
>         if (rc < 0)
> -               goto out_err;
> +               goto err_probe;
>
>         priv->manufacturer_id = vendor;
>
>         rc = tpm_tis_read8(priv, TPM_RID(0), &rid);
>         if (rc < 0)
> -               goto out_err;
> +               goto err_probe;
>
>         dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
>                  (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
> @@ -937,13 +937,13 @@ int tpm_tis_core_init(struct device *dev
>         probe = probe_itpm(chip);
>         if (probe < 0) {
>                 rc = -ENODEV;
> -               goto out_err;
> +               goto err_probe;
>         }
>
>         /* Figure out the capabilities */
>         rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps);
>         if (rc < 0)
> -               goto out_err;
> +               goto err_probe;
>
>         dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
>                 intfcaps);
> @@ -977,10 +977,9 @@ int tpm_tis_core_init(struct device *dev
>                 if (tpm_get_timeouts(chip)) {
>                         dev_err(dev, "Could not get TPM timeouts and durations\n");
>                         rc = -ENODEV;
> -                       goto out_err;
> +                       goto err_probe;
>                 }
>
> -               tpm_chip_start(chip);
>                 chip->flags |= TPM_CHIP_FLAG_IRQ;
>                 if (irq) {
>                         tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
> @@ -991,18 +990,20 @@ int tpm_tis_core_init(struct device *dev
>                 } else {
>                         tpm_tis_probe_irq(chip, intmask);
>                 }
> -               tpm_chip_stop(chip);
>         }
>
> +       tpm_chip_stop(chip);
> +
>         rc = tpm_chip_register(chip);
>         if (rc)
> -               goto out_err;
> -
> -       if (chip->ops->clk_enable != NULL)
> -               chip->ops->clk_enable(chip, false);
> +               goto err_start;
>
>         return 0;
> -out_err:
> +
> +err_probe:
> +       tpm_chip_stop(chip);
> +
> +err_start:
>         if ((chip->ops != NULL) && (chip->ops->clk_enable != NULL))
>                 chip->ops->clk_enable(chip, false);
>
>
>
> Patches currently in stable-queue which might be from jsnitsel@redhat.com are
>
> queue-5.4/iommu-fix-kasan-use-after-free-in-iommu_insert_resv_region.patch
> queue-5.4/iommu-vt-d-fix-dmar-pte-read-access-not-set-error.patch
> queue-5.4/iommu-set-group-default-domain-before-creating-direct-mappings.patch
> queue-5.4/tpm_tis-reserve-chip-for-duration-of-tpm_tis_core_init.patch
> queue-5.4/iommu-vt-d-allocate-reserved-region-for-isa-with-correct-permission.patch
> queue-5.4/iommu-vt-d-set-isa-bridge-reserved-region-as-relaxable.patch