From: Benjamin Herrenschmidt <bh40@calva.net>
To: linuxppc-dev@lists.linuxppc.org
Cc: Cort Dougan <cort@persephone.cs.nmt.edu>,
Jesper Skov <jskov@cygnus.co.uk>
Subject: Re: Synchronization [was Re: The Magic Show: kernel_map() disappearing]
Date: Thu, 14 Jan 1999 14:27:52 +0100 [thread overview]
Message-ID: <19990114142752.015604@mail.mipsys.com> (raw)
In-Reply-To: <13981.45420.95483.559227@lassi.cygnus.co.uk>
On Thu, Jan 14, 1999, Jesper Skov <jskov@cygnus.co.uk> wrote:
>We would want to use eieio for drivers and such accessing their
>controller in a strict serialized manner. We would want to use sync
>for SMP related stuff since it ensures, well, synchronization between
>multiple CPUs wrt memory access.
And I'll add the usual warning: If the device is a PCI device and you
need to make sure that the write actually reached the device (for example
making sure the interrupt enable bits are set before re-enabling the
interrupts on the CPU), you should add a read from the same device (from
the same bus should be enough) to make sure tall the bridges in the path
to the device completed their write.
Remember that a write to PCI is usually a "posted write" and so is
asynchronous, regardless of eieio or sync's done on the CPU.
--
E-Mail: <mailto:bh40@calva.net>
BenH. Web : <http://calvaweb.calvacom.fr/bh40/>
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next prev parent reply other threads:[~1999-01-14 13:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <13980.23937.676502.388522@lassi.cygnus.co.uk>
[not found] ` <Pine.LNX.3.96.990113130000.3632F-100000@persephone.cs.nmt.edu>
1999-01-14 8:57 ` Synchronization [was Re: The Magic Show: kernel_map() disappearing] Jesper Skov
1999-01-14 9:55 ` Jes Sorensen
1999-01-14 16:25 ` luther sven
1999-01-14 13:27 ` Benjamin Herrenschmidt [this message]
1999-01-14 19:46 ` Douglas Godfrey
1999-01-14 20:52 ` Alan Cox
1999-01-14 21:53 ` Cort Dougan
1999-01-15 1:38 ` Alan Cox
1999-01-15 8:26 ` Jesper Skov
1999-01-15 1:57 ` Paul Mackerras
1999-01-15 8:40 ` Jes Sorensen
1999-01-15 16:10 ` Alan Cox
1999-01-15 19:28 ` Cort Dougan
1999-01-16 1:00 ` Douglas Godfrey
1999-01-16 1:09 ` Synchronization [was Re: The Magic Show: kernel_map() Alan Cox
1999-01-15 8:50 Synchronization [was Re: The Magic Show: kernel_map() disappearing] Benjamin Herrenschmidt
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