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authorAzhar Shaikh <azhar.shaikh@intel.com>2017-12-22 12:13:44 -0800
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2018-01-08 12:58:38 +0200
commitb3e958ce4c585bf666de249dc794971ebc62d2d3 (patch)
treee7cbb652ff058c2e5841ddb42071c02dfc102901
parentc382babccba2c82fe57f9e647f290fb7bf4d130d (diff)
tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()
Commit 5e572cab92f0bb5 ("tpm: Enable CLKRUN protocol for Braswell systems") disabled CLKRUN protocol during TPM transactions and re-enabled once the transaction is completed. But there were still some corner cases observed where, reading of TPM header failed for savestate command while going to suspend, which resulted in suspend failure. To fix this issue keep the CLKRUN protocol disabled for the entire duration of a single TPM command and not disabling and re-enabling again for every TPM transaction. For the other TPM accesses outside TPM command flow, add a higher level of disabling and re-enabling the CLKRUN protocol, instead of doing for every TPM transaction. Fixes: 5e572cab92f0bb5 ("tpm: Enable CLKRUN protocol for Braswell systems") Signed-off-by: Azhar Shaikh <azhar.shaikh@intel.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
-rw-r--r--drivers/char/tpm/tpm-interface.c6
-rw-r--r--drivers/char/tpm/tpm_tis.c92
-rw-r--r--drivers/char/tpm/tpm_tis_core.c108
-rw-r--r--drivers/char/tpm/tpm_tis_core.h4
-rw-r--r--include/linux/tpm.h1
5 files changed, 119 insertions, 92 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index af355bd97bea..76df4fbcf089 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -425,6 +425,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
if (chip->dev.parent)
pm_runtime_get_sync(chip->dev.parent);
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
/* Store the decision as chip->locality will be changed. */
need_locality = chip->locality == -1;
@@ -501,6 +504,9 @@ out:
chip->locality = -1;
}
out_no_locality:
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
if (chip->dev.parent)
pm_runtime_put_sync(chip->dev.parent);
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 923f8f2cbaca..c847fc69a2fc 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -133,79 +133,17 @@ static int check_acpi_tpm2(struct device *dev)
}
#endif
-#ifdef CONFIG_X86
-#define LPC_CNTRL_OFFSET 0x84
-#define LPC_CLKRUN_EN (1 << 2)
-
-/**
- * tpm_platform_begin_xfer() - clear LPC CLKRUN_EN i.e. clocks will be running
- */
-static void tpm_platform_begin_xfer(struct tpm_tis_data *data)
-{
- u32 clkrun_val;
-
- if (!is_bsw())
- return;
-
- clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
-
- /* Disable LPC CLKRUN# */
- clkrun_val &= ~LPC_CLKRUN_EN;
- iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
-
- /*
- * Write any random value on port 0x80 which is on LPC, to make
- * sure LPC clock is running before sending any TPM command.
- */
- outb(0xCC, 0x80);
-
-}
-
-/**
- * tpm_platform_end_xfer() - set LPC CLKRUN_EN i.e. clocks can be turned off
- */
-static void tpm_platform_end_xfer(struct tpm_tis_data *data)
-{
- u32 clkrun_val;
-
- if (!is_bsw())
- return;
-
- clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
-
- /* Enable LPC CLKRUN# */
- clkrun_val |= LPC_CLKRUN_EN;
- iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
-
- /*
- * Write any random value on port 0x80 which is on LPC, to make
- * sure LPC clock is running before sending any TPM command.
- */
- outb(0xCC, 0x80);
-
-}
-#else
-static void tpm_platform_begin_xfer(struct tpm_tis_data *data)
-{
-}
-
-static void tpm_platform_end_xfer(struct tpm_tis_data *data)
-{
-}
-#endif
-
static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
u8 *result)
{
struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
- tpm_platform_begin_xfer(data);
+ if (is_bsw() && !(data->flags & TPM_TIS_CLK_ENABLE))
+ WARN(1, "CLKRUN not enabled!\n");
while (len--)
*result++ = ioread8(phy->iobase + addr);
- tpm_platform_end_xfer(data);
-
return 0;
}
@@ -214,13 +152,12 @@ static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
{
struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
- tpm_platform_begin_xfer(data);
+ if (is_bsw() && !(data->flags & TPM_TIS_CLK_ENABLE))
+ WARN(1, "CLKRUN not enabled!\n");
while (len--)
iowrite8(*value++, phy->iobase + addr);
- tpm_platform_end_xfer(data);
-
return 0;
}
@@ -228,12 +165,11 @@ static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
{
struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
- tpm_platform_begin_xfer(data);
+ if (is_bsw() && !(data->flags & TPM_TIS_CLK_ENABLE))
+ WARN(1, "CLKRUN not enabled!\n");
*result = ioread16(phy->iobase + addr);
- tpm_platform_end_xfer(data);
-
return 0;
}
@@ -241,12 +177,11 @@ static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
{
struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
- tpm_platform_begin_xfer(data);
+ if (is_bsw() && !(data->flags & TPM_TIS_CLK_ENABLE))
+ WARN(1, "CLKRUN not enabled!\n");
*result = ioread32(phy->iobase + addr);
- tpm_platform_end_xfer(data);
-
return 0;
}
@@ -254,12 +189,11 @@ static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
{
struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
- tpm_platform_begin_xfer(data);
+ if (is_bsw() && !(data->flags & TPM_TIS_CLK_ENABLE))
+ WARN(1, "CLKRUN not enabled!\n");
iowrite32(value, phy->iobase + addr);
- tpm_platform_end_xfer(data);
-
return 0;
}
@@ -341,9 +275,6 @@ static void tpm_tis_pnp_remove(struct pnp_dev *dev)
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
- if (is_bsw())
- iounmap(priv->ilb_base_addr);
-
}
static struct pnp_driver tis_pnp_driver = {
@@ -395,9 +326,6 @@ static int tpm_tis_plat_remove(struct platform_device *pdev)
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
- if (is_bsw())
- iounmap(priv->ilb_base_addr);
-
return 0;
}
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index aff567840e50..3238731fdbfd 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -37,6 +37,8 @@
*/
#define TPM_POLL_SLEEP 1 /* msec */
+static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value);
+
static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
bool check_cancel, bool *canceled)
{
@@ -487,19 +489,28 @@ static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
int i, rc;
u32 did_vid;
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
if (rc < 0)
- return rc;
+ goto out;
for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
if (vendor_timeout_overrides[i].did_vid != did_vid)
continue;
memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
sizeof(vendor_timeout_overrides[i].timeout_us));
- return true;
+ rc = true;
}
- return false;
+ rc = false;
+
+out:
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
+ return rc;
}
/*
@@ -719,14 +730,74 @@ void tpm_tis_remove(struct tpm_chip *chip)
u32 interrupt;
int rc;
+ tpm_tis_clkrun_enable(chip, true);
+
rc = tpm_tis_read32(priv, reg, &interrupt);
if (rc < 0)
interrupt = 0;
tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
+
+ tpm_tis_clkrun_enable(chip, false);
+
+ if (priv->ilb_base_addr)
+ iounmap(priv->ilb_base_addr);
}
EXPORT_SYMBOL_GPL(tpm_tis_remove);
+/**
+ * tpm_tis_clkrun_enable() - Keep clkrun protocol disabled for entire duration
+ * of a single TPM command
+ * @chip: TPM chip to use
+ * @value: 1 - Disable CLKRUN protocol, so that clocks are free running
+ * 0 - Enable CLKRUN protocol
+ * Call this function directly in tpm_tis_remove() in error or driver removal
+ * path, since the chip->ops is set to NULL in tpm_chip_unregister().
+ */
+static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value)
+{
+ struct tpm_tis_data *data = dev_get_drvdata(&chip->dev);
+ u32 clkrun_val;
+
+ if (!IS_ENABLED(CONFIG_X86) || !is_bsw())
+ return;
+
+ if (value) {
+ data->flags |= TPM_TIS_CLK_ENABLE;
+ data->clkrun_enabled++;
+ if (data->clkrun_enabled > 1)
+ return;
+ clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
+
+ /* Disable LPC CLKRUN# */
+ clkrun_val &= ~LPC_CLKRUN_EN;
+ iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
+
+ /*
+ * Write any random value on port 0x80 which is on LPC, to make
+ * sure LPC clock is running before sending any TPM command.
+ */
+ outb(0xCC, 0x80);
+ } else {
+ data->clkrun_enabled--;
+ if (data->clkrun_enabled)
+ return;
+
+ clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
+
+ /* Enable LPC CLKRUN# */
+ clkrun_val |= LPC_CLKRUN_EN;
+ iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
+
+ /*
+ * Write any random value on port 0x80 which is on LPC, to make
+ * sure LPC clock is running before sending any TPM command.
+ */
+ outb(0xCC, 0x80);
+ data->flags &= ~TPM_TIS_CLK_ENABLE;
+ }
+}
+
static const struct tpm_class_ops tpm_tis = {
.flags = TPM_OPS_AUTO_STARTUP,
.status = tpm_tis_status,
@@ -739,6 +810,7 @@ static const struct tpm_class_ops tpm_tis = {
.req_canceled = tpm_tis_req_canceled,
.request_locality = request_locality,
.relinquish_locality = release_locality,
+ .clk_enable = tpm_tis_clkrun_enable,
};
int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
@@ -773,6 +845,9 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
return -ENOMEM;
}
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
if (wait_startup(chip, 0) != 0) {
rc = -ENODEV;
goto out_err;
@@ -864,14 +939,18 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
}
rc = tpm_chip_register(chip);
- if (rc && is_bsw())
- iounmap(priv->ilb_base_addr);
+ if (rc)
+ goto out_err;
- return rc;
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
+ return 0;
out_err:
+ if ((chip->ops != NULL) && (chip->ops->clk_enable != NULL))
+ chip->ops->clk_enable(chip, false);
+
tpm_tis_remove(chip);
- if (is_bsw())
- iounmap(priv->ilb_base_addr);
return rc;
}
@@ -884,22 +963,31 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
u32 intmask;
int rc;
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
/* reenable interrupts that device may have lost or
* BIOS/firmware may have disabled
*/
rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
if (rc < 0)
- return;
+ goto out;
rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
if (rc < 0)
- return;
+ goto out;
intmask |= TPM_INTF_CMD_READY_INT
| TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
| TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
+
+out:
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
+ return;
}
int tpm_tis_resume(struct device *dev)
diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h
index 458847f72758..afc50cde1ba6 100644
--- a/drivers/char/tpm/tpm_tis_core.h
+++ b/drivers/char/tpm/tpm_tis_core.h
@@ -79,11 +79,14 @@ enum tis_defaults {
#define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
#define TPM_RID(l) (0x0F04 | ((l) << 12))
+#define LPC_CNTRL_OFFSET 0x84
+#define LPC_CLKRUN_EN (1 << 2)
#define INTEL_LEGACY_BLK_BASE_ADDR 0xFED08000
#define ILB_REMAP_SIZE 0x100
enum tpm_tis_flags {
TPM_TIS_ITPM_WORKAROUND = BIT(0),
+ TPM_TIS_CLK_ENABLE = BIT(1),
};
struct tpm_tis_data {
@@ -93,6 +96,7 @@ struct tpm_tis_data {
bool irq_tested;
unsigned int flags;
void __iomem *ilb_base_addr;
+ u16 clkrun_enabled;
wait_queue_head_t int_queue;
wait_queue_head_t read_queue;
const struct tpm_tis_phy_ops *phy_ops;
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index ddc9b88ff6d3..bcdd3790e94d 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -45,6 +45,7 @@ struct tpm_class_ops {
unsigned long *timeout_cap);
int (*request_locality)(struct tpm_chip *chip, int loc);
void (*relinquish_locality)(struct tpm_chip *chip, int loc);
+ void (*clk_enable)(struct tpm_chip *chip, bool value);
};
#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)