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Date: Tue, 2 Sep 2014 20:22:58 +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>,
Stefan Berger <stefanb@...ux.vnet.ibm.com>,
Luigi Semenzato <semenzato@...gle.com>,
tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v6] tpm_tis: verify interrupt during init
On Tue, 2 Sep 2014, Jason Gunthorpe wrote:
> On Sat, Aug 30, 2014 at 11:23:56PM +0000, Scot Doyle wrote:
>> The output is now
>> [ 1.526798] tpm_tis 00:08: 1.2 TPM (device-id 0xB, rev-id 16)
>> [ 5.914732] tpm_tis 00:08: [Firmware Bug]: TPM interrupt not working, polling instead
>
> Cool, why did it take 4 seconds though?
It's spending that time (now 3 seconds) in tpm_tis_send_data.
Output is
[ 2.928481] tpm_tis 00:08: 1.2 TPM (device-id 0xB, rev-id 16)
[ 5.943468] tpm_tis 00:08: [Firmware Bug]: TPM interrupt not working, polling instead
> Looks really good to me, I can try and test the next version here this
> week.
Thanks!
---
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 2c46734..6e42d60 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);
@@ -338,6 +342,21 @@ 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
@@ -345,8 +364,10 @@ out_err:
*/
static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
- int rc;
+ int rc, irq;
u32 ordinal;
+ bool test_irq;
+ struct priv_data *priv = chip->vendor.priv;
rc = tpm_tis_send_data(chip, buf, len);
if (rc < 0)
@@ -358,13 +379,30 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (chip->vendor.irq) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
- if (wait_for_tpm_stat
- (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- tpm_calc_ordinal_duration(chip, ordinal),
- &chip->vendor.read_queue, false) < 0) {
+ test_irq = !priv->irq_tested;
+ if (test_irq) {
+ irq = chip->vendor.irq;
+ chip->vendor.irq = 0;
+ }
+ rc = wait_for_tpm_stat
+ (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ tpm_calc_ordinal_duration(chip, ordinal),
+ &chip->vendor.read_queue, false);
+ if (test_irq)
+ chip->vendor.irq = irq;
+ if (rc < 0) {
rc = -ETIME;
goto out_err;
}
+ if (test_irq) {
+ 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 len;
out_err:
@@ -505,6 +543,7 @@ 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)
@@ -534,10 +573,14 @@ 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;
if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
return -ENODEV;
+ priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
+ chip->vendor.priv = priv;
+
chip->vendor.iobase = ioremap(start, len);
if (!chip->vendor.iobase) {
rc = -EIO;
@@ -605,19 +648,6 @@ 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 +749,18 @@ 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);
--
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