On Mon, 25 Aug 2014, Jason Gunthorpe wrote:
> On Mon, Aug 25, 2014, Scot Doyle wrote:
>> 3. Custom SeaBIOS. Blacklist the tpm_tis module so that it doesn't load
>> and therefore doesn't issue startup(clear) to the TPM chip.
>
> It seems to me at least in this case you should be able to get rid of
> the IRQ entry, people are going to be flashing the custom SeaBIOS
> anyhow.
The person building many of these custom SeaBIOS packages has removed the
TPM section from the DSDT, so this may be addressed.
On Mon, 25 Aug 2014, Jason Gunthorpe wrote:
> I think you'll have to directly test in the tis driver if the
> interrupt is working.
>
> The ordering in the TIS driver is wrong, interrupts should be turned
> on before any TPM commands are issued. This is what other drivers are
> doing.
>
> If you fix this, tis can then just count interrupts recieved and check
> if that is 0 to detect failure and then turn them off.
How about something like this?
It doesn't enable stock SeaBIOS machines to suspend/resume before the 30
second interrupt timeout, unless using interrupts=0 or force=1.
---
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 2c46734..ae701d8 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -493,6 +493,8 @@ static irqreturn_t tis_int_probe(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static bool interrupted = false;
+
static irqreturn_t tis_int_handler(int dummy, void *dev_id)
{
struct tpm_chip *chip = dev_id;
@@ -511,6 +513,8 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
for (i = 0; i < 5; i++)
if (check_locality(chip, i) >= 0)
break;
+ if (interrupt & TPM_INTF_CMD_READY_INT)
+ interrupted = true;
if (interrupt &
(TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
TPM_INTF_CMD_READY_INT))
@@ -612,12 +616,6 @@ static int tpm_tis_init(struct device *dev,
resource_size_t start,
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);
@@ -693,7 +691,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t
start,
free_irq(i, chip);
}
}
- if (chip->vendor.irq) {
+ if (interrupts && chip->vendor.irq) {
iowrite8(chip->vendor.irq,
chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
@@ -719,6 +717,32 @@ static int tpm_tis_init(struct device *dev,
resource_size_t start,
}
}
+ /* Test interrupt and/or prepare for later save state */
+ interrupted = false;
+ if (tpm_do_selftest(chip)) {
+ if (!interrupts || interrupted) {
+ dev_err(dev, "TPM self test failed\n");
+ rc = -ENODEV;
+ goto out_err;
+ } else {
+ /* Turn off interrupt */
+ iowrite32(intmask,
+ chip->vendor.iobase +
+ TPM_INT_ENABLE(chip->vendor.locality));
+ free_irq(chip->vendor.irq, chip);
+
+ /* Retry in polling mode */
+ chip->vendor.irq = 0;
+ if (tpm_do_selftest(chip)) {
+ dev_err(dev, "TPM self test failed\n");
+ rc = -ENODEV;
+ goto out_err;
+ } else {
+ dev_err(dev, "ACPI DSDT entry incorrect,
polling instead\n");
+ }
+ }
+ }
+
INIT_LIST_HEAD(&chip->vendor.list);
mutex_lock(&tis_lock);
list_add(&chip->vendor.list, &tis_chips);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
