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Date: Tue, 14 Feb 2012 17:01:09 -0200
From: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
To: James Morris <jmorris@...ei.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: Tim Gardner <tim.gardner@...onical.com>,
Stefan Berger <stefanb@...ux.vnet.ibm.com>
Subject: [PULL] TPM: Smarter iTPM probing
Hi James,
Please pull into your next branch the following changes since
commit 4040153087478993cbf0809f444400a3c808074c:
security: trim security.h (2012-02-14 10:45:42 +1100)
that are available in the git repository at:
git://github.com/srajiv/tpm.git for-james
Stefan Berger (2):
tpm_tis: Only probe iTPMs
tpm_tis: Clean up after module_param cleanup
Tim Gardner (1):
TPM: Zero buffer whole after copying to userspace
drivers/char/tpm/tpm.c | 3 ++-
drivers/char/tpm/tpm.h | 2 ++
drivers/char/tpm/tpm_tis.c | 17 ++++++++++-------
3 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 32362cf..ad7c732 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -1221,12 +1221,13 @@ ssize_t tpm_read(struct file *file, char __user *buf,
ret_size = atomic_read(&chip->data_pending);
atomic_set(&chip->data_pending, 0);
if (ret_size > 0) { /* relay data */
+ ssize_t orig_ret_size = ret_size;
if (size < ret_size)
ret_size = size;
mutex_lock(&chip->buffer_mutex);
rc = copy_to_user(buf, chip->data_buffer, ret_size);
- memset(chip->data_buffer, 0, ret_size);
+ memset(chip->data_buffer, 0, orig_ret_size);
if (rc)
ret_size = -EFAULT;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 0105471..b1c5280 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -99,6 +99,8 @@ struct tpm_vendor_specific {
wait_queue_head_t int_queue;
};
+#define TPM_VID_INTEL 0x8086
+
struct tpm_chip {
struct device *dev; /* Device stuff */
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index a174862..1250e33 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -367,7 +367,12 @@ static int probe_itpm(struct tpm_chip *chip)
0x00, 0x00, 0x00, 0xf1
};
size_t len = sizeof(cmd_getticks);
- int rem_itpm = itpm;
+ bool rem_itpm = itpm;
+ u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
+
+ /* probe only iTPMS */
+ if (vendor != TPM_VID_INTEL)
+ return 0;
itpm = 0;
@@ -390,9 +395,6 @@ static int probe_itpm(struct tpm_chip *chip)
out:
itpm = rem_itpm;
tpm_tis_ready(chip);
- /* some TPMs need a break here otherwise they will not work
- * correctly on the immediately subsequent command */
- msleep(chip->vendor.timeout_b);
release_locality(chip, chip->vendor.locality, 0);
return rc;
@@ -508,7 +510,7 @@ 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, irq_s, irq_e;
+ int rc, i, irq_s, irq_e, probe;
struct tpm_chip *chip;
if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
@@ -538,11 +540,12 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
if (!itpm) {
- itpm = probe_itpm(chip);
- if (itpm < 0) {
+ probe = probe_itpm(chip);
+ if (probe < 0) {
rc = -ENODEV;
goto out_err;
}
+ itpm = (probe == 0) ? 0 : 1;
}
if (itpm)
--
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