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Date: Tue, 23 Sep 2014 11:55:33 +0000 (UTC)
From: Scot Doyle <lkml14@...tdoyle.com>
To: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
cc: Peter Huewe <peterhuewe@....de>, Ashley Lai <ashley@...leylai.com>,
Marcel Selhorst <tpmdd@...horst.net>,
Michael Mullin <masmullin@...il.com>,
Luigi Semenzato <semenzato@...gle.com>,
tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9] tpm_tis: verify interrupt during init
On Tue, 23 Sep 2014, Scot Doyle wrote:
> Some machines, such as the Acer C720 and Toshiba CB35, have TPMs that do
> not send IRQs while also having an ACPI TPM entry indicating that they
> will be sent. These machines freeze on resume while the tpm_tis module
> waits for an IRQ, eventually timing out.
>
> When in interrupt mode, the tpm_tis module should receive an IRQ during
> module init. Fall back to polling mode if none is received when expected.
>
> Signed-off-by: Scot Doyle <lkml14@...tdoyle.com>
> Tested-by: Michael Mullin <masmullin@...il.com>
> Reviewed-By: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Did I prematurely add your Reviewed-by? If so, I apologize.
> ---
> drivers/char/tpm/tpm_tis.c | 76 +++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 62 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index 2c46734..bfe1f1a 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -75,6 +75,10 @@ enum tis_defaults {
> #define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
> #define TPM_RID(l) (0x0F04 | ((l) << 12))
>
> +struct priv_data {
> + bool irq_tested;
> +};
> +
> static LIST_HEAD(tis_chips);
> static DEFINE_MUTEX(tis_lock);
>
> @@ -338,12 +342,27 @@ out_err:
> return rc;
> }
>
> +static void disable_interrupts(struct tpm_chip *chip)
> +{
> + u32 intmask;
> + intmask =
> + ioread32(chip->vendor.iobase +
> + TPM_INT_ENABLE(chip->vendor.locality));
> + intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
> + TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
> + iowrite32(intmask,
> + chip->vendor.iobase +
> + TPM_INT_ENABLE(chip->vendor.locality));
> + free_irq(chip->vendor.irq, chip);
> + chip->vendor.irq = 0;
> +}
> +
> /*
> * If interrupts are used (signaled by an irq set in the vendor structure)
> * tpm.c can skip polling for the data to be available as the interrupt is
> * waited for here
> */
> -static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
> +static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
> {
> int rc;
> u32 ordinal;
> @@ -373,6 +392,30 @@ out_err:
> return rc;
> }
>
> +static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
> +{
> + int rc, irq;
> + struct priv_data *priv = chip->vendor.priv;
> +
> + if (!chip->vendor.irq || priv->irq_tested)
> + return tpm_tis_send_main(chip, buf, len);
> +
> + /* Verify receipt of the expected IRQ */
> + irq = chip->vendor.irq;
> + chip->vendor.irq = 0;
> + rc = tpm_tis_send_main(chip, buf, len);
> + chip->vendor.irq = irq;
> + if (!priv->irq_tested)
> + msleep(1);
> + if (!priv->irq_tested) {
> + disable_interrupts(chip);
> + dev_err(chip->dev,
> + FW_BUG "TPM interrupt not working, polling instead\n");
> + }
> + priv->irq_tested = true;
> + return rc;
> +}
> +
> struct tis_vendor_timeout_override {
> u32 did_vid;
> unsigned long timeout_us[4];
> @@ -505,6 +548,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
> if (interrupt == 0)
> return IRQ_NONE;
>
> + ((struct priv_data*)chip->vendor.priv)->irq_tested = true;
> if (interrupt & TPM_INTF_DATA_AVAIL_INT)
> wake_up_interruptible(&chip->vendor.read_queue);
> if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
> @@ -534,9 +578,14 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
> u32 vendor, intfcaps, intmask;
> int rc, i, irq_s, irq_e, probe;
> struct tpm_chip *chip;
> + struct priv_data *priv;
>
> + priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
> + if (priv == NULL)
> + return -ENOMEM;
> if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
> return -ENODEV;
> + chip->vendor.priv = priv;
>
> chip->vendor.iobase = ioremap(start, len);
> if (!chip->vendor.iobase) {
> @@ -605,19 +654,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
> if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
> dev_dbg(dev, "\tData Avail Int Support\n");
>
> - /* get the timeouts before testing for irqs */
> - if (tpm_get_timeouts(chip)) {
> - dev_err(dev, "Could not get TPM timeouts and durations\n");
> - rc = -ENODEV;
> - goto out_err;
> - }
> -
> - if (tpm_do_selftest(chip)) {
> - 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);
> @@ -719,6 +755,18 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
> }
> }
>
> + if (tpm_get_timeouts(chip)) {
> + dev_err(dev, "Could not get TPM timeouts and durations\n");
> + rc = -ENODEV;
> + goto out_err;
> + }
> +
> + if (tpm_do_selftest(chip)) {
> + dev_err(dev, "TPM self test failed\n");
> + rc = -ENODEV;
> + goto out_err;
> + }
> +
> INIT_LIST_HEAD(&chip->vendor.list);
> mutex_lock(&tis_lock);
> list_add(&chip->vendor.list, &tis_chips);
> --
> 2.1.0
>
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