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Message-Id: <20161207115001.18332-4-jarkko.sakkinen@linux.intel.com>
Date: Wed, 7 Dec 2016 13:50:00 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Peter Huewe <peterhuewe@....de>
Cc: linux-security-module@...r.kernel.org,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Marcel Selhorst <tpmdd@...horst.net>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
tpmdd-devel@...ts.sourceforge.net (moderated list:TPM DEVICE DRIVER),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 3/3] tpm_crb: request and relinquish locality 0
Request and relinquish locality for the driver use in order to be a
better citizen in a multi locality environment like TXT.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
drivers/char/tpm/tpm_crb.c | 73 ++++++++++++++++++++++++++++++++++++++++------
1 file changed, 64 insertions(+), 9 deletions(-)
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 853bd7b..96f661a 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -34,6 +34,15 @@ enum crb_defaults {
CRB_ACPI_START_INDEX = 1,
};
+enum crb_loc_ctrl {
+ CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0),
+ CRB_LOC_CTRL_RELINQUISH = BIT(1),
+};
+
+enum crb_loc_state {
+ CRB_LOC_STATE_LOC_ASSIGNED = BIT(1),
+};
+
enum crb_ctrl_req {
CRB_CTRL_REQ_CMD_READY = BIT(0),
CRB_CTRL_REQ_GO_IDLE = BIT(1),
@@ -165,13 +174,42 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
CRB_CTRL_REQ_CMD_READY /* mask */,
0, /* value */
TPM2_TIMEOUT_C)) {
- dev_warn(dev, "cmdReady timed out\n");
+ dev_warn(dev, "TPM_CRB_CTRL_REQ_x.cmdReady timed out\n");
+ return -ETIME;
+ }
+
+ return 0;
+}
+
+static int crb_request_locality(struct tpm_chip *chip)
+{
+ struct crb_priv *priv = dev_get_drvdata(&chip->dev);
+
+ if (!priv->regs_h)
+ return 0;
+
+ iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
+ if (!crb_wait_for_reg_32(&priv->regs_h->loc_state,
+ CRB_LOC_STATE_LOC_ASSIGNED, /* mask */
+ CRB_LOC_STATE_LOC_ASSIGNED, /* value */
+ TPM2_TIMEOUT_C)) {
+ dev_warn(&chip->dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
return -ETIME;
}
return 0;
}
+static void crb_relinquish_locality(struct tpm_chip *chip)
+{
+ struct crb_priv *priv = dev_get_drvdata(&chip->dev);
+
+ if (!priv->regs_h)
+ return;
+
+ iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
+}
+
static u8 crb_status(struct tpm_chip *chip)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
@@ -188,23 +226,33 @@ static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
unsigned int expected;
+ int rc;
/* sanity check */
if (count < 6)
return -EIO;
- if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR)
- return -EIO;
+ rc = crb_request_locality(chip);
+ if (rc)
+ return rc;
+
+ if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR) {
+ rc = -EIO;
+ goto out;
+ }
memcpy_fromio(buf, priv->rsp, 6);
expected = be32_to_cpup((__be32 *) &buf[2]);
-
- if (expected > count)
- return -EIO;
+ if (expected > count) {
+ rc = -EIO;
+ goto out;
+ }
memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6);
- return expected;
+out:
+ crb_relinquish_locality(chip);
+ return rc ? rc : expected;
}
static int crb_do_acpi_start(struct tpm_chip *chip)
@@ -227,7 +275,11 @@ static int crb_do_acpi_start(struct tpm_chip *chip)
static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
- int rc = 0;
+ int rc;
+
+ rc = crb_request_locality(chip);
+ if (rc)
+ return rc;
/* Zero the cancel register so that the next command will not get
* canceled.
@@ -237,7 +289,8 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (len > priv->cmd_size) {
dev_err(&chip->dev, "invalid command count value %zd %d\n",
len, priv->cmd_size);
- return -E2BIG;
+ rc = -E2BIG;
+ goto out;
}
memcpy_toio(priv->cmd, buf, len);
@@ -251,6 +304,8 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (priv->flags & CRB_FL_ACPI_START)
rc = crb_do_acpi_start(chip);
+out:
+ crb_relinquish_locality(chip);
return rc;
}
--
2.9.3
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