From: Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
To: tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Cc: patrickc-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org,
jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-ima-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: [PATCH v2 4/4] tpm: use tpm_msleep() value as max delay
Date: Wed, 6 Sep 2017 08:56:39 -0400 [thread overview]
Message-ID: <20170906125643.5070-5-nayna@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170906125643.5070-1-nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Currently, tpm_msleep() uses delay_msec as the minimum value in
usleep_range. However, that is the maximum time we want to wait.
The function is modified to use the delay_msec as the maximum
value, not the minimum value.
After this change, performance on a TPM 1.2 with an 8 byte
burstcount for 1000 extends improved from ~9sec to ~8sec.
Signed-off-by: Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Acked-by: Mimi Zohar <zohar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
drivers/char/tpm/tpm.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index eb2f8818eded..ff5a8b7b80b9 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -533,8 +533,8 @@ int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
static inline void tpm_msleep(unsigned int delay_msec)
{
- usleep_range(delay_msec * 1000,
- (delay_msec * 1000) + TPM_TIMEOUT_RANGE_US);
+ usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US,
+ delay_msec * 1000);
};
struct tpm_chip *tpm_chip_find_get(int chip_num);
--
2.13.3
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
next prev parent reply other threads:[~2017-09-06 12:56 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-06 12:56 [PATCH v2 0/4] additional TPM performance improvements Nayna Jain
2017-09-06 12:56 ` [PATCH v2 3/4] tpm: reduce tpm_msleep() time in get_burstcount() Nayna Jain
2017-09-13 1:00 ` Jarkko Sakkinen
2017-09-15 12:40 ` Nayna Jain
[not found] ` <20170906125643.5070-1-nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-09-06 12:56 ` [PATCH v2 1/4] tpm: ignore burstcount to improve tpm_tis send() performance Nayna Jain
2017-09-06 16:12 ` Jason Gunthorpe
2017-09-13 18:52 ` [tpmdd-devel] " Ken Goldman
[not found] ` <3c418974-a4c7-518e-b218-f6373c10209e-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-09-13 19:01 ` Peter Huewe
2017-09-13 0:45 ` Jarkko Sakkinen
[not found] ` <20170912222010.ltm76m5vy2kupydi-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-09-13 18:39 ` Peter Huewe
2017-09-13 23:10 ` Jarkko Sakkinen
2017-09-15 12:29 ` Nayna Jain
2017-09-15 15:19 ` Jarkko Sakkinen
2017-09-06 12:56 ` [PATCH v2 2/4] tpm: define __wait_for_tpm_stat to specify variable polling sleep time Nayna Jain
2017-09-13 0:58 ` Jarkko Sakkinen
2017-09-15 12:37 ` Nayna Jain
2017-09-15 15:20 ` Jarkko Sakkinen
2017-09-06 12:56 ` Nayna Jain [this message]
2017-09-13 0:47 ` [PATCH v2 4/4] tpm: use tpm_msleep() value as max delay Jarkko Sakkinen
2017-09-14 9:25 ` Nayna Jain
2017-09-14 12:28 ` Jarkko Sakkinen
2017-09-06 12:56 ` [PATCH 2/4] tpm: define __wait_for_tpm_stat to specify variable polling sleep time Nayna Jain
2017-09-06 12:58 ` Nayna
2017-09-06 12:56 ` [PATCH 1/4] tpm: ignore burstcount to improve tpm_tis send() performance Nayna Jain
[not found] ` <20170906125643.5070-6-nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-09-06 12:58 ` Nayna
2017-09-07 16:18 ` [PATCH v2 0/4] additional TPM performance improvements Jarkko Sakkinen
2017-09-11 15:20 ` [tpmdd-devel] " Alexander.Steffen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170906125643.5070-5-nayna@linux.vnet.ibm.com \
--to=nayna-23vcf4htsmix0ybbhkvfkdbpr1lh4cv8@public.gmane.org \
--cc=jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org \
--cc=jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org \
--cc=linux-ima-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=patrickc-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org \
--cc=tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).