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Date: Fri, 5 Dec 2014 15:05:33 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Scot Doyle <lkml14@...tdoyle.com>
Cc: Peter Huewe <peterhuewe@....de>, Ashley Lai <ashley@...leylai.com>,
Marcel Selhorst <tpmdd@...horst.net>,
christophe.ricard@...il.com, josh.triplett@...el.com,
linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
Will Arthur <will.c.arthur@...el.com>,
tpmdd-devel@...ts.sourceforge.net,
jason.gunthorpe@...idianresearch.com,
trousers-tech@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH v9 8/8] tpm: TPM 2.0 FIFO Interface
On Thu, Dec 04, 2014 at 03:25:12PM +0000, Scot Doyle wrote:
> Hi Jarkko,
>
> On Thu, 4 Dec 2014, Jarkko Sakkinen wrote:
> > From: Will Arthur <will.c.arthur@...el.com>
> >
> > Detect TPM 2.0 by using the extended STS (STS3) register. For TPM 2.0,
> > instead of calling tpm_get_timeouts(), assign duration and timeout
> > values defined in the TPM 2.0 PTP specification.
> >
> > Signed-off-by: Will Arthur <will.c.arthur@...el.com>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > ---
> > drivers/char/tpm/tpm_tis.c | 80 ++++++++++++++++++++++++++++++++++++++--------
> > 1 file changed, 67 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> > index 89e1abb..71cbb2d 100644
> > --- a/drivers/char/tpm/tpm_tis.c
> > +++ b/drivers/char/tpm/tpm_tis.c
> > @@ -1,5 +1,6 @@
> > /*
> > * Copyright (C) 2005, 2006 IBM Corporation
> > + * Copyright (C) 2014 Intel Corporation
> > *
> > * Authors:
> > * Leendert van Doorn <leendert@...son.ibm.com>
> > @@ -44,6 +45,10 @@ enum tis_status {
> > TPM_STS_DATA_EXPECT = 0x08,
> > };
> >
> > +enum tis_status3 {
> > + TPM_STS3_TPM2_FAM = 0x04,
> > +};
> > +
> > enum tis_int_flags {
> > TPM_GLOBAL_INT_ENABLE = 0x80000000,
> > TPM_INTF_BURST_COUNT_STATIC = 0x100,
> > @@ -70,6 +75,7 @@ enum tis_defaults {
> > #define TPM_INT_STATUS(l) (0x0010 | ((l) << 12))
> > #define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12))
> > #define TPM_STS(l) (0x0018 | ((l) << 12))
> > +#define TPM_STS3(l) (0x001b | ((l) << 12))
> > #define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))
> >
> > #define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
> > @@ -363,6 +369,7 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
> > {
> > int rc;
> > u32 ordinal;
> > + unsigned long dur;
> >
> > rc = tpm_tis_send_data(chip, buf, len);
> > if (rc < 0)
> > @@ -374,9 +381,14 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
> >
> > if (chip->vendor.irq) {
> > ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
> > +
> > + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> > + dur = tpm2_calc_ordinal_duration(chip, ordinal);
> > + else
> > + dur = tpm_calc_ordinal_duration(chip, ordinal);
> > +
> > if (wait_for_tpm_stat
> > - (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
> > - tpm_calc_ordinal_duration(chip, ordinal),
> > + (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
> > &chip->vendor.read_queue, false) < 0) {
> > rc = -ETIME;
> > goto out_err;
> > @@ -588,6 +600,7 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
> > int rc, i, irq_s, irq_e, probe;
> > struct tpm_chip *chip;
> > struct priv_data *priv;
> > + u8 sts3;
> >
> > priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
> > if (priv == NULL)
> > @@ -604,11 +617,28 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
> > if (!chip->vendor.iobase)
> > return -EIO;
> >
> > + sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1));
> > + if ((sts3 & TPM_STS3_TPM2_FAM) == TPM_STS3_TPM2_FAM)
> > + chip->flags = TPM_CHIP_FLAG_TPM2;
> > +
> > /* Default timeouts */
> > - chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
> > - chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
> > - chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
> > - chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
> > + if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> > + chip->vendor.timeout_a = usecs_to_jiffies(TPM2_TIMEOUT_A);
> > + chip->vendor.timeout_b = usecs_to_jiffies(TPM2_TIMEOUT_B);
> > + chip->vendor.timeout_c = usecs_to_jiffies(TPM2_TIMEOUT_C);
> > + chip->vendor.timeout_d = usecs_to_jiffies(TPM2_TIMEOUT_D);
> > + chip->vendor.duration[TPM_SHORT] =
> > + usecs_to_jiffies(TPM2_DURATION_SHORT);
> > + chip->vendor.duration[TPM_MEDIUM] =
> > + usecs_to_jiffies(TPM2_DURATION_MEDIUM);
> > + chip->vendor.duration[TPM_LONG] =
> > + usecs_to_jiffies(TPM2_DURATION_LONG);
> > + } else {
> > + chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
> > + chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
> > + chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
> > + chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
> > + }
> >
> > if (wait_startup(chip, 0) != 0) {
> > rc = -ENODEV;
> > @@ -623,8 +653,8 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
> > vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
> > chip->vendor.manufacturer_id = vendor;
> >
> > - dev_info(dev,
> > - "1.2 TPM (device-id 0x%X, rev-id %d)\n",
> > + dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
> > + (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
> > vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
> >
> > if (!itpm) {
> > @@ -665,6 +695,23 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
> > if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
> > dev_dbg(dev, "\tData Avail Int Support\n");
> >
> > + /* get the timeouts before testing for irqs */
> > + if (!(chip->flags & TPM_CHIP_FLAG_TPM2) && tpm_get_timeouts(chip)) {
> > + dev_err(dev, "Could not get TPM timeouts and durations\n");
> > + rc = -ENODEV;
> > + goto out_err;
> > + }
> > +
> > + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> > + rc = tpm2_do_selftest(chip);
> > + else
> > + rc = tpm_do_selftest(chip);
> > + if (rc) {
> > + dev_err(dev, "TPM self test failed\n");
> > + rc = -ENODEV;
> > + goto out_err;
> > + }
> > +
> > /* INTERRUPT Setup */
> > init_waitqueue_head(&chip->vendor.read_queue);
> > init_waitqueue_head(&chip->vendor.int_queue);
>
> In Peter's for-james branch, commit 0e6cb01, the v1.2 calls to
> tpm_get_timeouts and tpm_do_selftest were moved toward the end of
> tpm_tis_init.
Right. My bad. Could this be reverted with a separate fix or do
I prepare a new patch set? I would propose the former...
> > @@ -720,7 +767,10 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
> > chip->vendor.probed_irq = 0;
> >
> > /* Generate Interrupts */
> > - tpm_gen_interrupt(chip);
> > + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> > + tpm2_gen_interrupt(chip);
> > + else
> > + tpm_gen_interrupt(chip);
> >
> > chip->vendor.irq = chip->vendor.probed_irq;
> >
> > @@ -808,14 +858,18 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
> > static int tpm_tis_resume(struct device *dev)
> > {
> > struct tpm_chip *chip = dev_get_drvdata(dev);
> > - int ret;
> > + int ret = 0;
> >
> > if (chip->vendor.irq)
> > tpm_tis_reenable_interrupts(chip);
> >
> > - ret = tpm_pm_resume(dev);
> > - if (!ret)
> > - tpm_do_selftest(chip);
> > + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> > + tpm2_do_selftest(chip);
> > + else {
> > + ret = tpm_pm_resume(dev);
> > + if (!ret)
> > + tpm_do_selftest(chip);
> > + }
> >
> > return ret;
> > }
> > --
> > 2.1.0
> >
/Jarkko
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