tpm2: add longer timeouts for creation commands.

TPM2_CC_Create(0x153) and TPM2_CC_CreatePrimary (0x131) involve generation
of crypto keys which can be a computationally intensive task. The timeout
is set to 3min. Rather than increasing default timeout a new constant is
added, to not stall for too long on regular commands failures.

Signed-off-by: Tomas Winkler <tomas.winkler@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>

3 files changed, 26 insertions, 13 deletions

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 43ded5dfc7d9..47aacecdc85c 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -696,6 +696,8 @@ int tpm_get_timeouts(struct tpm_chip *chip)
                     msecs_to_jiffies(TPM2_DURATION_MEDIUM);
                 chip->duration[TPM_LONG] =
                     msecs_to_jiffies(TPM2_DURATION_LONG);
+                chip->duration[TPM_LONG_LONG] =
+                    msecs_to_jiffies(TPM2_DURATION_LONG_LONG);
 
                 chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
                 return 0;
@@ -784,6 +786,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
                 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
         chip->duration[TPM_LONG] =
                 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
+        chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */
 
         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
          * value wrong and apparently reports msecs rather than usecs. So we
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index b0ee61e5d414..ab3bcdd4d328 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -67,7 +67,9 @@ enum tpm_duration {
         TPM_SHORT = 0,
         TPM_MEDIUM = 1,
         TPM_LONG = 2,
+        TPM_LONG_LONG = 3,
         TPM_UNDEFINED,
+        TPM_NUM_DURATIONS = TPM_UNDEFINED,
 };
 
 #define TPM_WARN_RETRY          0x800
@@ -79,15 +81,20 @@ enum tpm_duration {
 #define TPM_HEADER_SIZE         10
 
 enum tpm2_const {
-        TPM2_PLATFORM_PCR       = 24,
-        TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
-        TPM2_TIMEOUT_A          = 750,
-        TPM2_TIMEOUT_B          = 2000,
-        TPM2_TIMEOUT_C          = 200,
-        TPM2_TIMEOUT_D          = 30,
-        TPM2_DURATION_SHORT     = 20,
-        TPM2_DURATION_MEDIUM    = 750,
-        TPM2_DURATION_LONG      = 2000,
+        TPM2_PLATFORM_PCR       =     24,
+        TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
+};
+
+enum tpm2_timeouts {
+        TPM2_TIMEOUT_A          =    750,
+        TPM2_TIMEOUT_B          =   2000,
+        TPM2_TIMEOUT_C          =    200,
+        TPM2_TIMEOUT_D          =     30,
+        TPM2_DURATION_SHORT     =     20,
+        TPM2_DURATION_MEDIUM    =    750,
+        TPM2_DURATION_LONG      =   2000,
+        TPM2_DURATION_LONG_LONG = 300000,
+        TPM2_DURATION_DEFAULT   = 120000,
 };
 
 enum tpm2_structures {
@@ -123,6 +130,7 @@ enum tpm2_algorithms {
 
 enum tpm2_command_codes {
         TPM2_CC_FIRST           = 0x011F,
+        TPM2_CC_CREATE_PRIMARY  = 0x0131,
         TPM2_CC_SELF_TEST       = 0x0143,
         TPM2_CC_STARTUP         = 0x0144,
         TPM2_CC_SHUTDOWN        = 0x0145,
@@ -227,7 +235,7 @@ struct tpm_chip {
         unsigned long timeout_c; /* jiffies */
         unsigned long timeout_d; /* jiffies */
         bool timeout_adjusted;
-        unsigned long duration[3]; /* jiffies */
+        unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
         bool duration_adjusted;
 
         struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index a700f8f9ead7..c1ddbbba406e 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -90,6 +90,8 @@ static struct tpm2_hash tpm2_hash_map[] = {
  * of time the chip could take to return the result. The values
  * of the SHORT, MEDIUM, and LONG durations are taken from the
  * PC Client Profile (PTP) specification.
+ * LONG_LONG is for commands that generates keys which empirically
+ * takes longer time on some systems.
  */
 static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
         TPM_UNDEFINED,          /* 11F */
@@ -110,7 +112,7 @@ static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
         TPM_UNDEFINED,          /* 12e */
         TPM_UNDEFINED,          /* 12f */
         TPM_UNDEFINED,          /* 130 */
-        TPM_UNDEFINED,          /* 131 */
+        TPM_LONG_LONG,          /* 131 */
         TPM_UNDEFINED,          /* 132 */
         TPM_UNDEFINED,          /* 133 */
         TPM_UNDEFINED,          /* 134 */
@@ -144,7 +146,7 @@ static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
         TPM_UNDEFINED,          /* 150 */
         TPM_UNDEFINED,          /* 151 */
         TPM_UNDEFINED,          /* 152 */
-        TPM_UNDEFINED,          /* 153 */
+        TPM_LONG_LONG,          /* 153 */
         TPM_UNDEFINED,          /* 154 */
         TPM_UNDEFINED,          /* 155 */
         TPM_UNDEFINED,          /* 156 */
@@ -821,7 +823,7 @@ unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
                 duration = chip->duration[index];
 
         if (duration <= 0)
-                duration = 2 * 60 * HZ;
+                duration = msecs_to_jiffies(TPM2_DURATION_DEFAULT);
 
         return duration;
 }