tpm_tis: Fix the probing for interrupts

This patch fixes several aspects of the probing for interrupts.

This patch reads the TPM's timeouts before probing for the interrupts. The
tpm_get_timeouts() function is invoked in polling mode and gets the proper
timeouts from the TPM so that we don't need to fall back to 2 minutes timeouts
for short duration commands while the interrupt probing is happening.

This patch introduces a variable probed_irq into the vendor structure that gets
the irq number if an interrupt is received while the the tpm_gen_interrupt()
function is run in polling mode during interrupt probing. Previously some
parts of tpm_gen_interrupt() were run in polling mode, then the irq variable
was set in the interrupt handler when an interrupt was received and execution
of tpm_gen_interrupt() ended up switching over to interrupt mode.
tpm_gen_interrupt() execution ended up on an event queue where it eventually
timed out since the probing handler doesn't wake any queues.

Before calling into free_irq() clear all interrupt flags that may have
been set by the TPM. The reason is that free_irq() will call into the probing
interrupt handler and may otherwise fool us into thinking that a real interrupt
happened (because we see the flags as being set) while the TPM's interrupt line
is not even connected to anything on the motherboard. This solves a problem
on one machine I did testing on (Thinkpad T60).

If a TPM claims to use a specifc interrupt, the probing is done as well
to verify that the interrupt is actually working. If a TPM indicates
that it does not use a specific interrupt (returns '0'), probe all interrupts
from 3 to 15.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>

1 files changed, 27 insertions, 6 deletions

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index b97ce2b205d7..47517e49d2be 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -438,7 +438,7 @@ static irqreturn_t tis_int_probe(int irq, void *dev_id)
         if (interrupt == 0)
                 return IRQ_NONE;
 
-        chip->vendor.irq = irq;
+        chip->vendor.probed_irq = irq;
 
         /* Clear interrupts handled with TPM_EOI */
         iowrite32(interrupt,
@@ -486,7 +486,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
                         resource_size_t len, unsigned int irq)
 {
         u32 vendor, intfcaps, intmask;
-        int rc, i;
+        int rc, i, irq_s, irq_e;
         struct tpm_chip *chip;
 
         if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
@@ -544,6 +544,9 @@ 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 */
+        tpm_get_timeouts(chip);
+
         /* INTERRUPT Setup */
         init_waitqueue_head(&chip->vendor.read_queue);
         init_waitqueue_head(&chip->vendor.int_queue);
@@ -562,13 +565,19 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
         if (interrupts)
                 chip->vendor.irq = irq;
         if (interrupts && !chip->vendor.irq) {
-                chip->vendor.irq =
+                irq_s =
                     ioread8(chip->vendor.iobase +
                             TPM_INT_VECTOR(chip->vendor.locality));
+                if (irq_s) {
+                        irq_e = irq_s;
+                } else {
+                        irq_s = 3;
+                        irq_e = 15;
+                }
 
-                for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
+                for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
                         iowrite8(i, chip->vendor.iobase +
-                                    TPM_INT_VECTOR(chip->vendor.locality));
+                                 TPM_INT_VECTOR(chip->vendor.locality));
                         if (request_irq
                             (i, tis_int_probe, IRQF_SHARED,
                              chip->vendor.miscdev.name, chip) != 0) {
@@ -590,9 +599,22 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
                                   chip->vendor.iobase +
                                   TPM_INT_ENABLE(chip->vendor.locality));
 
+                        chip->vendor.probed_irq = 0;
+
                         /* Generate Interrupts */
                         tpm_gen_interrupt(chip);
 
+                        chip->vendor.irq = chip->vendor.probed_irq;
+
+                        /* free_irq will call into tis_int_probe;
+                           clear all irqs we haven't seen while doing
+                           tpm_gen_interrupt */
+                        iowrite32(ioread32
+                                  (chip->vendor.iobase +
+                                   TPM_INT_STATUS(chip->vendor.locality)),
+                                  chip->vendor.iobase +
+                                  TPM_INT_STATUS(chip->vendor.locality));
+
                         /* Turn off */
                         iowrite32(intmask,
                                   chip->vendor.iobase +
@@ -631,7 +653,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
         list_add(&chip->vendor.list, &tis_chips);
         spin_unlock(&tis_lock);
 
-        tpm_get_timeouts(chip);
         tpm_continue_selftest(chip);
 
         return 0;