From: Segher Boessenkool <segher@kernel.crashing.org>
To: "Albert Cahalan" <acahalan@gmail.com>
Cc: linuxppc-dev@ozlabs.org, tglx@linutronix.de,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
Date: Sat, 19 May 2007 14:28:14 +0200 [thread overview]
Message-ID: <fa84736ae121902d4bee24eb23ca1d0b@kernel.crashing.org> (raw)
In-Reply-To: <787b0d920705181845h355eed4fk2bf93323332a9d90@mail.gmail.com>
>> Unfortunately, FIT exists only on Book E CPUs and MPC74xx aren't Book
>> E, IIUC.
>
> By the name "FIT" perhaps, but MPC74xx has essentially
> the same thing.
> Set MMCR0[TBEE], set MMCR0[PMXE], and choose a TBL bit via
> MMCR0[TBSEL].
That's the performance monitor, which could very well be
in use already (for performance monitoring stuff, who
would have guessed).
> It's also possible to trigger on the CPU cycle counter, but this would
> cost one of the performance counters. MPC7400 has 4, later CPUs have 6
> or more, and I think xPC7x0 had only 2.
7xx has at least four as well.
Segher
WARNING: multiple messages have this Message-ID (diff)
From: Segher Boessenkool <segher@kernel.crashing.org>
To: "Albert Cahalan" <acahalan@gmail.com>
Cc: tglx@linutronix.de, "Sergei Shtylyov" <sshtylyov@ru.mvista.com>,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
Date: Sat, 19 May 2007 14:28:14 +0200 [thread overview]
Message-ID: <fa84736ae121902d4bee24eb23ca1d0b@kernel.crashing.org> (raw)
In-Reply-To: <787b0d920705181845h355eed4fk2bf93323332a9d90@mail.gmail.com>
>> Unfortunately, FIT exists only on Book E CPUs and MPC74xx aren't Book
>> E, IIUC.
>
> By the name "FIT" perhaps, but MPC74xx has essentially
> the same thing.
> Set MMCR0[TBEE], set MMCR0[PMXE], and choose a TBL bit via
> MMCR0[TBSEL].
That's the performance monitor, which could very well be
in use already (for performance monitoring stuff, who
would have guessed).
> It's also possible to trigger on the CPU cycle counter, but this would
> cost one of the performance counters. MPC7400 has 4, later CPUs have 6
> or more, and I think xPC7x0 had only 2.
7xx has at least four as well.
Segher
next prev parent reply other threads:[~2007-05-19 12:28 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-18 3:24 [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver Albert Cahalan
2007-05-18 14:52 ` Sergei Shtylyov
2007-05-18 14:52 ` Sergei Shtylyov
2007-05-19 1:45 ` Albert Cahalan
2007-05-19 1:45 ` Albert Cahalan
2007-05-19 12:28 ` Segher Boessenkool [this message]
2007-05-19 12:28 ` Segher Boessenkool
2007-05-19 18:22 ` Albert Cahalan
2007-05-19 18:22 ` Albert Cahalan
-- strict thread matches above, loose matches on Subject: below --
2007-05-17 17:42 Sergei Shtylyov
2007-05-17 17:47 ` Kumar Gala
2007-05-17 17:47 ` Kumar Gala
2007-05-17 18:07 ` Sergei Shtylyov
2007-05-17 18:07 ` Sergei Shtylyov
2007-05-17 18:17 ` Kumar Gala
2007-05-17 18:17 ` Kumar Gala
2007-05-17 18:26 ` Sergei Shtylyov
2007-05-17 18:26 ` Sergei Shtylyov
2007-05-17 18:31 ` Kumar Gala
2007-05-17 18:31 ` Kumar Gala
2007-05-17 18:42 ` Sergei Shtylyov
2007-05-17 18:42 ` Sergei Shtylyov
2007-05-18 12:39 ` Matt Sealey
2007-05-18 12:39 ` Matt Sealey
2007-05-18 13:45 ` Sergei Shtylyov
2007-05-18 13:45 ` Sergei Shtylyov
2007-05-18 14:28 ` Matt Sealey
2007-05-18 14:28 ` Matt Sealey
2007-05-18 14:48 ` Thomas Gleixner
2007-05-18 14:48 ` Thomas Gleixner
2007-05-18 15:37 ` Matt Sealey
2007-05-18 15:37 ` Matt Sealey
2007-05-18 16:31 ` Kumar Gala
2007-05-18 16:31 ` Kumar Gala
2007-05-18 16:50 ` Thomas Gleixner
2007-05-18 16:50 ` Thomas Gleixner
2007-05-18 16:55 ` Matt Sealey
2007-05-18 16:55 ` Matt Sealey
2007-05-18 16:52 ` Matt Sealey
2007-05-18 16:52 ` Matt Sealey
2007-07-10 10:52 ` Gabriel Paubert
2007-07-10 10:52 ` Gabriel Paubert
2007-07-10 14:24 ` Segher Boessenkool
2007-07-10 14:24 ` Segher Boessenkool
2007-07-10 23:31 ` Paul Mackerras
2007-07-10 23:31 ` Paul Mackerras
2007-07-11 0:10 ` Segher Boessenkool
2007-07-11 0:10 ` Segher Boessenkool
2007-05-18 20:27 ` David Miller
2007-05-18 20:27 ` David Miller
2007-05-18 14:56 ` Daniel Walker
2007-05-18 14:56 ` Daniel Walker
2007-05-18 15:06 ` Sergei Shtylyov
2007-05-18 15:06 ` Sergei Shtylyov
2007-05-18 15:39 ` Daniel Walker
2007-05-18 15:39 ` Daniel Walker
2007-05-18 15:48 ` Sergei Shtylyov
2007-05-18 15:48 ` Sergei Shtylyov
2007-05-19 3:33 ` Paul Mackerras
2007-05-19 3:33 ` Paul Mackerras
2007-05-20 2:43 ` Daniel Walker
2007-05-20 2:43 ` Daniel Walker
2007-05-20 3:03 ` Benjamin Herrenschmidt
2007-05-20 3:03 ` Benjamin Herrenschmidt
2007-05-20 15:03 ` Matt Sealey
2007-05-20 15:03 ` Matt Sealey
2007-05-20 21:25 ` Benjamin Herrenschmidt
2007-05-20 21:25 ` Benjamin Herrenschmidt
2007-05-20 16:02 ` Segher Boessenkool
2007-05-20 16:02 ` Segher Boessenkool
2007-05-20 21:26 ` Benjamin Herrenschmidt
2007-05-20 21:26 ` Benjamin Herrenschmidt
2007-05-17 19:27 ` Segher Boessenkool
2007-05-17 19:27 ` Segher Boessenkool
2007-05-17 19:43 ` Sergei Shtylyov
2007-05-17 19:43 ` Sergei Shtylyov
2007-05-17 19:50 ` Segher Boessenkool
2007-05-17 19:50 ` Segher Boessenkool
2007-05-17 20:00 ` Sergei Shtylyov
2007-05-17 20:00 ` Sergei Shtylyov
2007-05-17 20:53 ` Segher Boessenkool
2007-05-17 20:53 ` Segher Boessenkool
2007-05-18 5:04 ` Benjamin Herrenschmidt
2007-05-18 5:04 ` Benjamin Herrenschmidt
2007-05-18 5:39 ` Dave Liu
2007-05-18 5:39 ` Dave Liu
2007-05-18 7:08 ` Benjamin Herrenschmidt
2007-05-18 7:08 ` Benjamin Herrenschmidt
2007-05-18 13:41 ` Sergei Shtylyov
2007-05-18 13:41 ` Sergei Shtylyov
2007-05-18 13:48 ` Sergei Shtylyov
2007-05-18 23:27 ` Benjamin Herrenschmidt
2007-05-18 23:27 ` Benjamin Herrenschmidt
2007-05-18 23:49 ` Segher Boessenkool
2007-05-18 23:49 ` Segher Boessenkool
2007-05-19 0:13 ` Benjamin Herrenschmidt
2007-05-19 0:13 ` Benjamin Herrenschmidt
2007-05-30 15:56 ` Milton Miller
2007-05-19 3:34 ` Paul Mackerras
2007-05-19 3:34 ` Paul Mackerras
2007-10-18 14:45 ` Sergei Shtylyov
2007-10-18 14:45 ` Sergei Shtylyov
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