* [PATCH v2 0/2] tpm: improving granularity in poll sleep times @ 2018-04-17 13:12 Nayna Jain 2018-04-17 13:12 ` [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() Nayna Jain 2018-04-17 13:12 ` [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity Nayna Jain 0 siblings, 2 replies; 7+ messages in thread From: Nayna Jain @ 2018-04-17 13:12 UTC (permalink / raw) To: linux-integrity Cc: zohar, linux-security-module, linux-kernel, peterhuewe, jarkko.sakkinen, tpmdd, jgunthorpe, patrickc, Nayna Jain The existing TPM polling code sleeps in each loop iteration for time in msecs ranging from 1 msecs to 5 msecs. However, many of the TPM commands complete much faster, resulting in unnecessary delays. This set of patches identifies such iterations and optimizes the sleep time. The first patch replaces TPM_POLL_SLEEP with TPM_TIMEOUT_POLL and moves it from tpm_tis_core.c to tpm.h as an enum with value 1 msecs. The second patch further reduces the TPM poll sleep time in get_burstcount() and wait_for_tpm_stat() in tpm_tis_core.c by calling usleep_range() directly. The change is only in the polling time, and the maximum timeout is still maintained the same. Thus, it should not affect the overall existing behavior. Changelog: v2: tpm: reduce poll sleep time in tpm_transmit() * merged previously defined two patches into this. * updated patch description as per Jarkko's feedback tpm: reduce polling time to usecs for even finer granularity * directly use usleep_range with finer granularity less than 1msec Nayna Jain (2): tpm: reduce poll sleep time in tpm_transmit() tpm: reduce polling time to usecs for even finer granularity drivers/char/tpm/tpm-interface.c | 2 +- drivers/char/tpm/tpm.h | 5 ++++- drivers/char/tpm/tpm_tis_core.c | 11 +++-------- 3 files changed, 8 insertions(+), 10 deletions(-) -- 2.13.3 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() 2018-04-17 13:12 [PATCH v2 0/2] tpm: improving granularity in poll sleep times Nayna Jain @ 2018-04-17 13:12 ` Nayna Jain 2018-04-18 15:01 ` Mimi Zohar 2018-04-24 16:27 ` Jarkko Sakkinen 2018-04-17 13:12 ` [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity Nayna Jain 1 sibling, 2 replies; 7+ messages in thread From: Nayna Jain @ 2018-04-17 13:12 UTC (permalink / raw) To: linux-integrity Cc: zohar, linux-security-module, linux-kernel, peterhuewe, jarkko.sakkinen, tpmdd, jgunthorpe, patrickc, Nayna Jain The TPM polling code in tpm_transmit sleeps in each loop iteration for 5 msecs. However, the TPM might return earlier, and thus waiting for 5 msecs adds an unnecessary delay. This patch reduces the polling sleep time in tpm_transmit() from 5 msecs to 1 msecs. Additionally, this patch renames TPM_POLL_SLEEP and moves it to tpm.h as an enum value. After this change, performance on a TPM 1.2 with an 8 byte burstcount for 1000 extends improved from ~14 sec to ~10.7 sec. Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> --- drivers/char/tpm/tpm-interface.c | 2 +- drivers/char/tpm/tpm.h | 3 ++- drivers/char/tpm/tpm_tis_core.c | 10 ++-------- 3 files changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 9e80a953d693..a676d8ad5992 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -470,7 +470,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, goto out; } - tpm_msleep(TPM_TIMEOUT); + tpm_msleep(TPM_TIMEOUT_POLL); rmb(); } while (time_before(jiffies, stop)); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index f895fba4e20d..7e797377e1eb 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -53,7 +53,8 @@ enum tpm_const { enum tpm_timeout { TPM_TIMEOUT = 5, /* msecs */ TPM_TIMEOUT_RETRY = 100, /* msecs */ - TPM_TIMEOUT_RANGE_US = 300 /* usecs */ + TPM_TIMEOUT_RANGE_US = 300, /* usecs */ + TPM_TIMEOUT_POLL = 1 /* msecs */ }; /* TPM addresses */ diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index da074e3db19b..021e6b68f2db 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -31,12 +31,6 @@ #include "tpm.h" #include "tpm_tis_core.h" -/* This is a polling delay to check for status and burstcount. - * As per ddwg input, expectation is that status check and burstcount - * check should return within few usecs. - */ -#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, @@ -90,7 +84,7 @@ static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, } } else { do { - tpm_msleep(TPM_POLL_SLEEP); + tpm_msleep(TPM_TIMEOUT_POLL); status = chip->ops->status(chip); if ((status & mask) == mask) return 0; @@ -232,7 +226,7 @@ static int get_burstcount(struct tpm_chip *chip) burstcnt = (value >> 8) & 0xFFFF; if (burstcnt) return burstcnt; - tpm_msleep(TPM_POLL_SLEEP); + tpm_msleep(TPM_TIMEOUT_POLL); } while (time_before(jiffies, stop)); return -EBUSY; } -- 2.13.3 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() 2018-04-17 13:12 ` [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() Nayna Jain @ 2018-04-18 15:01 ` Mimi Zohar 2018-04-24 16:27 ` Jarkko Sakkinen 1 sibling, 0 replies; 7+ messages in thread From: Mimi Zohar @ 2018-04-18 15:01 UTC (permalink / raw) To: Nayna Jain, linux-integrity Cc: linux-security-module, linux-kernel, peterhuewe, jarkko.sakkinen, tpmdd, jgunthorpe, patrickc On Tue, 2018-04-17 at 09:12 -0400, Nayna Jain wrote: > The TPM polling code in tpm_transmit sleeps in each loop iteration for > 5 msecs. However, the TPM might return earlier, and thus waiting for > 5 msecs adds an unnecessary delay. This patch reduces the polling sleep > time in tpm_transmit() from 5 msecs to 1 msecs. > > Additionally, this patch renames TPM_POLL_SLEEP and moves it to tpm.h as > an enum value. > > After this change, performance on a TPM 1.2 with an 8 byte burstcount > for 1000 extends improved from ~14 sec to ~10.7 sec. > > Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com> > --- > drivers/char/tpm/tpm-interface.c | 2 +- > drivers/char/tpm/tpm.h | 3 ++- > drivers/char/tpm/tpm_tis_core.c | 10 ++-------- > 3 files changed, 5 insertions(+), 10 deletions(-) > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c > index 9e80a953d693..a676d8ad5992 100644 > --- a/drivers/char/tpm/tpm-interface.c > +++ b/drivers/char/tpm/tpm-interface.c > @@ -470,7 +470,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, > goto out; > } > > - tpm_msleep(TPM_TIMEOUT); > + tpm_msleep(TPM_TIMEOUT_POLL); > rmb(); > } while (time_before(jiffies, stop)); > > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h > index f895fba4e20d..7e797377e1eb 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -53,7 +53,8 @@ enum tpm_const { > enum tpm_timeout { > TPM_TIMEOUT = 5, /* msecs */ > TPM_TIMEOUT_RETRY = 100, /* msecs */ > - TPM_TIMEOUT_RANGE_US = 300 /* usecs */ > + TPM_TIMEOUT_RANGE_US = 300, /* usecs */ > + TPM_TIMEOUT_POLL = 1 /* msecs */ > }; > > /* TPM addresses */ > diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c > index da074e3db19b..021e6b68f2db 100644 > --- a/drivers/char/tpm/tpm_tis_core.c > +++ b/drivers/char/tpm/tpm_tis_core.c > @@ -31,12 +31,6 @@ > #include "tpm.h" > #include "tpm_tis_core.h" > > -/* This is a polling delay to check for status and burstcount. > - * As per ddwg input, expectation is that status check and burstcount > - * check should return within few usecs. > - */ > -#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, > @@ -90,7 +84,7 @@ static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, > } > } else { > do { > - tpm_msleep(TPM_POLL_SLEEP); > + tpm_msleep(TPM_TIMEOUT_POLL); > status = chip->ops->status(chip); > if ((status & mask) == mask) > return 0; > @@ -232,7 +226,7 @@ static int get_burstcount(struct tpm_chip *chip) > burstcnt = (value >> 8) & 0xFFFF; > if (burstcnt) > return burstcnt; > - tpm_msleep(TPM_POLL_SLEEP); > + tpm_msleep(TPM_TIMEOUT_POLL); > } while (time_before(jiffies, stop)); > return -EBUSY; > } ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() 2018-04-17 13:12 ` [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() Nayna Jain 2018-04-18 15:01 ` Mimi Zohar @ 2018-04-24 16:27 ` Jarkko Sakkinen 1 sibling, 0 replies; 7+ messages in thread From: Jarkko Sakkinen @ 2018-04-24 16:27 UTC (permalink / raw) To: Nayna Jain Cc: linux-integrity, zohar, linux-security-module, linux-kernel, peterhuewe, tpmdd, jgunthorpe, patrickc On Tue, Apr 17, 2018 at 09:12:45AM -0400, Nayna Jain wrote: > The TPM polling code in tpm_transmit sleeps in each loop iteration for > 5 msecs. However, the TPM might return earlier, and thus waiting for > 5 msecs adds an unnecessary delay. This patch reduces the polling sleep > time in tpm_transmit() from 5 msecs to 1 msecs. I'm not sure what TPM returning earlier has to do with this. TPM probably never returns exactly in the spec defined timeout/duration. I just don't understand reasoning in this paragraph. > Additionally, this patch renames TPM_POLL_SLEEP and moves it to tpm.h as > an enum value. > > After this change, performance on a TPM 1.2 with an 8 byte burstcount > for 1000 extends improved from ~14 sec to ~10.7 sec. You cannot give absolute numbers without a context (platform, software). > Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> /Jarkko ^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity 2018-04-17 13:12 [PATCH v2 0/2] tpm: improving granularity in poll sleep times Nayna Jain 2018-04-17 13:12 ` [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() Nayna Jain @ 2018-04-17 13:12 ` Nayna Jain 2018-04-18 15:02 ` Mimi Zohar 2018-04-24 16:30 ` Jarkko Sakkinen 1 sibling, 2 replies; 7+ messages in thread From: Nayna Jain @ 2018-04-17 13:12 UTC (permalink / raw) To: linux-integrity Cc: zohar, linux-security-module, linux-kernel, peterhuewe, jarkko.sakkinen, tpmdd, jgunthorpe, patrickc, Nayna Jain The TPM burstcount and status commands are supposed to return very quickly [1][2]. This patch further reduces the TPM poll sleep time to usecs in get_burstcount() and wait_for_tpm_stat() by calling usleep_range() directly. After this change, performance on a TPM 1.2 with an 8 byte burstcount for 1000 extends improved from ~10.7 sec to ~7 sec. [1] From TCG Specification "TCG PC Client Specific TPM Interface Specification (TIS), Family 1.2": "NOTE : It takes roughly 330 ns per byte transfer on LPC. 256 bytes would take 84 us, which is a long time to stall the CPU. Chipsets may not be designed to post this much data to LPC; therefore, the CPU itself is stalled for much of this time. Sending 1 kB would take 350 μs. Therefore, even if the TPM_STS_x.burstCount field is a high value, software SHOULD be interruptible during this period." [2] From TCG Specification 2.0, "TCG PC Client Platform TPM Profile (PTP) Specification": "It takes roughly 330 ns per byte transfer on LPC. 256 bytes would take 84 us. Chipsets may not be designed to post this much data to LPC; therefore, the CPU itself is stalled for much of this time. Sending 1 kB would take 350 us. Therefore, even if the TPM_STS_x.burstCount field is a high value, software should be interruptible during this period. For SPI, assuming 20MHz clock and 64-byte transfers, it would take about 120 usec to move 256B of data. Sending 1kB would take about 500 usec. If the transactions are done using 4 bytes at a time, then it would take about 1 msec. to transfer 1kB of data." Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> --- drivers/char/tpm/tpm.h | 4 +++- drivers/char/tpm/tpm_tis_core.c | 5 +++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 7e797377e1eb..f0e4d290c347 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -54,7 +54,9 @@ enum tpm_timeout { TPM_TIMEOUT = 5, /* msecs */ TPM_TIMEOUT_RETRY = 100, /* msecs */ TPM_TIMEOUT_RANGE_US = 300, /* usecs */ - TPM_TIMEOUT_POLL = 1 /* msecs */ + TPM_TIMEOUT_POLL = 1, /* msecs */ + TPM_TIMEOUT_USECS_MIN = 100, /* usecs */ + TPM_TIMEOUT_USECS_MAX = 500 /* usecs */ }; /* TPM addresses */ diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 021e6b68f2db..5bba5c662423 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -84,7 +84,8 @@ static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, } } else { do { - tpm_msleep(TPM_TIMEOUT_POLL); + usleep_range(TPM_TIMEOUT_USECS_MIN, + TPM_TIMEOUT_USECS_MAX); status = chip->ops->status(chip); if ((status & mask) == mask) return 0; @@ -226,7 +227,7 @@ static int get_burstcount(struct tpm_chip *chip) burstcnt = (value >> 8) & 0xFFFF; if (burstcnt) return burstcnt; - tpm_msleep(TPM_TIMEOUT_POLL); + usleep_range(TPM_TIMEOUT_USECS_MIN, TPM_TIMEOUT_USECS_MAX); } while (time_before(jiffies, stop)); return -EBUSY; } -- 2.13.3 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity 2018-04-17 13:12 ` [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity Nayna Jain @ 2018-04-18 15:02 ` Mimi Zohar 2018-04-24 16:30 ` Jarkko Sakkinen 1 sibling, 0 replies; 7+ messages in thread From: Mimi Zohar @ 2018-04-18 15:02 UTC (permalink / raw) To: Nayna Jain, linux-integrity Cc: linux-security-module, linux-kernel, peterhuewe, jarkko.sakkinen, tpmdd, jgunthorpe, patrickc On Tue, 2018-04-17 at 09:12 -0400, Nayna Jain wrote: > The TPM burstcount and status commands are supposed to return very > quickly [1][2]. This patch further reduces the TPM poll sleep time to usecs > in get_burstcount() and wait_for_tpm_stat() by calling usleep_range() > directly. > > After this change, performance on a TPM 1.2 with an 8 byte burstcount for > 1000 extends improved from ~10.7 sec to ~7 sec. > > [1] From TCG Specification "TCG PC Client Specific TPM Interface > Specification (TIS), Family 1.2": > > "NOTE : It takes roughly 330 ns per byte transfer on LPC. 256 bytes would > take 84 us, which is a long time to stall the CPU. Chipsets may not be > designed to post this much data to LPC; therefore, the CPU itself is > stalled for much of this time. Sending 1 kB would take 350 μs. Therefore, > even if the TPM_STS_x.burstCount field is a high value, software SHOULD > be interruptible during this period." > > [2] From TCG Specification 2.0, "TCG PC Client Platform TPM Profile > (PTP) Specification": > > "It takes roughly 330 ns per byte transfer on LPC. 256 bytes would take > 84 us. Chipsets may not be designed to post this much data to LPC; > therefore, the CPU itself is stalled for much of this time. Sending 1 kB > would take 350 us. Therefore, even if the TPM_STS_x.burstCount field is a > high value, software should be interruptible during this period. For SPI, > assuming 20MHz clock and 64-byte transfers, it would take about 120 usec > to move 256B of data. Sending 1kB would take about 500 usec. If the > transactions are done using 4 bytes at a time, then it would take about > 1 msec. to transfer 1kB of data." > > Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com> > --- > drivers/char/tpm/tpm.h | 4 +++- > drivers/char/tpm/tpm_tis_core.c | 5 +++-- > 2 files changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h > index 7e797377e1eb..f0e4d290c347 100644 > --- a/drivers/char/tpm/tpm.h > +++ b/drivers/char/tpm/tpm.h > @@ -54,7 +54,9 @@ enum tpm_timeout { > TPM_TIMEOUT = 5, /* msecs */ > TPM_TIMEOUT_RETRY = 100, /* msecs */ > TPM_TIMEOUT_RANGE_US = 300, /* usecs */ > - TPM_TIMEOUT_POLL = 1 /* msecs */ > + TPM_TIMEOUT_POLL = 1, /* msecs */ > + TPM_TIMEOUT_USECS_MIN = 100, /* usecs */ > + TPM_TIMEOUT_USECS_MAX = 500 /* usecs */ > }; > > /* TPM addresses */ > diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c > index 021e6b68f2db..5bba5c662423 100644 > --- a/drivers/char/tpm/tpm_tis_core.c > +++ b/drivers/char/tpm/tpm_tis_core.c > @@ -84,7 +84,8 @@ static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, > } > } else { > do { > - tpm_msleep(TPM_TIMEOUT_POLL); > + usleep_range(TPM_TIMEOUT_USECS_MIN, > + TPM_TIMEOUT_USECS_MAX); > status = chip->ops->status(chip); > if ((status & mask) == mask) > return 0; > @@ -226,7 +227,7 @@ static int get_burstcount(struct tpm_chip *chip) > burstcnt = (value >> 8) & 0xFFFF; > if (burstcnt) > return burstcnt; > - tpm_msleep(TPM_TIMEOUT_POLL); > + usleep_range(TPM_TIMEOUT_USECS_MIN, TPM_TIMEOUT_USECS_MAX); > } while (time_before(jiffies, stop)); > return -EBUSY; > } ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity 2018-04-17 13:12 ` [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity Nayna Jain 2018-04-18 15:02 ` Mimi Zohar @ 2018-04-24 16:30 ` Jarkko Sakkinen 1 sibling, 0 replies; 7+ messages in thread From: Jarkko Sakkinen @ 2018-04-24 16:30 UTC (permalink / raw) To: Nayna Jain Cc: linux-integrity, zohar, linux-security-module, linux-kernel, peterhuewe, tpmdd, jgunthorpe, patrickc On Tue, Apr 17, 2018 at 09:12:46AM -0400, Nayna Jain wrote: > The TPM burstcount and status commands are supposed to return very > quickly [1][2]. This patch further reduces the TPM poll sleep time to usecs > in get_burstcount() and wait_for_tpm_stat() by calling usleep_range() > directly. > > After this change, performance on a TPM 1.2 with an 8 byte burstcount for > 1000 extends improved from ~10.7 sec to ~7 sec. > > [1] From TCG Specification "TCG PC Client Specific TPM Interface > Specification (TIS), Family 1.2": > > "NOTE : It takes roughly 330 ns per byte transfer on LPC. 256 bytes would > take 84 us, which is a long time to stall the CPU. Chipsets may not be > designed to post this much data to LPC; therefore, the CPU itself is > stalled for much of this time. Sending 1 kB would take 350 μs. Therefore, > even if the TPM_STS_x.burstCount field is a high value, software SHOULD > be interruptible during this period." > > [2] From TCG Specification 2.0, "TCG PC Client Platform TPM Profile > (PTP) Specification": > > "It takes roughly 330 ns per byte transfer on LPC. 256 bytes would take > 84 us. Chipsets may not be designed to post this much data to LPC; > therefore, the CPU itself is stalled for much of this time. Sending 1 kB > would take 350 us. Therefore, even if the TPM_STS_x.burstCount field is a > high value, software should be interruptible during this period. For SPI, > assuming 20MHz clock and 64-byte transfers, it would take about 120 usec > to move 256B of data. Sending 1kB would take about 500 usec. If the > transactions are done using 4 bytes at a time, then it would take about > 1 msec. to transfer 1kB of data." > > Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Great, thanks for finding those references. Kind of stuff that I will forget within months and have to revisit with git blame/log :-) Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> /Jarkko ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2018-04-24 16:30 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-04-17 13:12 [PATCH v2 0/2] tpm: improving granularity in poll sleep times Nayna Jain 2018-04-17 13:12 ` [PATCH v2 1/2] tpm: reduce poll sleep time in tpm_transmit() Nayna Jain 2018-04-18 15:01 ` Mimi Zohar 2018-04-24 16:27 ` Jarkko Sakkinen 2018-04-17 13:12 ` [PATCH v2 2/2] tpm: reduce polling time to usecs for even finer granularity Nayna Jain 2018-04-18 15:02 ` Mimi Zohar 2018-04-24 16:30 ` Jarkko Sakkinen
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