From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Damian Muszynski <damian.muszynski@intel.com>
Cc: herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org,
qat-linux@intel.com,
Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Subject: Re: [PATCH v3 3/5] crypto: qat - add measure clock frequency
Date: Thu, 22 Jun 2023 21:26:18 +0300 [thread overview]
Message-ID: <ZJSSSnFhuDR9CkEc@smile.fi.intel.com> (raw)
In-Reply-To: <20230622180405.133298-4-damian.muszynski@intel.com>
On Thu, Jun 22, 2023 at 08:04:04PM +0200, Damian Muszynski wrote:
> The QAT hardware does not expose a mechanism to report its clock
> frequency. This is required to implement the Heartbeat feature.
>
> Add a clock measuring algorithm that estimates the frequency by
> comparing the internal timestamp counter incremented by the firmware
> with the time measured by the kernel.
> The frequency value is only used internally and not exposed to
> the user.
...
> + /*
> + * Enclose the division to allow the preprocessor to precalculate it,
> + * and avoid promoting macro to 64bits before division.
"...promoting r-value to 64-bit..."
> + */
> + *frequency = temp * (HZ_PER_MHZ / 10);
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2023-06-22 18:26 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-22 18:04 [PATCH v3 0/5] crypto: qat - add heartbeat feature Damian Muszynski
2023-06-22 18:04 ` [PATCH v3 1/5] crypto: qat - add internal timer for qat 4xxx Damian Muszynski
2023-06-22 18:04 ` [PATCH v3 2/5] crypto: qat - drop obsolete heartbeat interface Damian Muszynski
2023-06-22 18:04 ` [PATCH v3 3/5] crypto: qat - add measure clock frequency Damian Muszynski
2023-06-22 18:26 ` Andy Shevchenko [this message]
2023-06-22 18:04 ` [PATCH v3 4/5] crypto: qat - add heartbeat feature Damian Muszynski
2023-06-22 18:04 ` [PATCH v3 5/5] crypto: qat - add heartbeat counters check Damian Muszynski
2023-06-22 18:21 ` [PATCH v3 0/5] crypto: qat - add heartbeat feature Andy Shevchenko
2023-06-22 18:27 ` Andy Shevchenko
2023-06-26 11:22 ` Damian Muszynski
2023-06-26 11:31 ` Giovanni Cabiddu
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