From: Segher Boessenkool <segher@kernel.crashing.org>
To: Paul Mackerras <paulus@ozlabs.org>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 4/5] powerpc: Define config option for processors without broadcast TLBIE
Date: Fri, 31 Jan 2025 11:26:36 -0600 [thread overview]
Message-ID: <20250131172636.GF20626@gate.crashing.org> (raw)
In-Reply-To: <Z5lf-OrrbRe5Q0O-@thinks.paulus.ozlabs.org>
On Wed, Jan 29, 2025 at 09:53:44AM +1100, Paul Mackerras wrote:
> Power ISA v3.1 implementations in the Linux Compliancy Subset and
> lower are not required to implement broadcast TLBIE, and in fact
> Microwatt doesn't.
But this pretty much means that such systems cannot be SMP systems at
all. Implementing the necessary synchronisation using some
cobbled-together rickety jury-rigged contraption is not anyone's goal.
Interesting that you did not see any performance loss, btw! Well you
didn't try it on anything bigger than a simple dual CPU :-)
Segher
next prev parent reply other threads:[~2025-01-31 17:27 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-28 22:49 [PATCH 0/5] Microwatt updates Paul Mackerras
2025-01-28 22:51 ` [PATCH 1/5] powerpc/microwatt: Select COMMON_CLK in order to get the clock framework Paul Mackerras
2025-01-29 5:57 ` Nicholas Piggin
2025-01-28 22:52 ` [PATCH 2/5] powerpc/microwatt: Device-tree updates Paul Mackerras
2025-01-29 6:36 ` Nicholas Piggin
2025-01-29 7:18 ` Paul Mackerras
2025-01-29 8:20 ` Nicholas Piggin
2025-01-31 17:03 ` Segher Boessenkool
2025-01-31 16:55 ` Segher Boessenkool
2025-01-31 16:53 ` Segher Boessenkool
2025-01-31 16:48 ` Segher Boessenkool
2025-01-28 22:52 ` [PATCH 3/5] powerpc/microwatt: Define an idle power-save function Paul Mackerras
2025-01-29 6:06 ` Nicholas Piggin
2025-01-29 6:49 ` Paul Mackerras
2025-01-31 16:32 ` Segher Boessenkool
2025-02-01 1:41 ` Paul Mackerras
2025-01-31 16:25 ` Segher Boessenkool
2025-01-28 22:53 ` [PATCH 4/5] powerpc: Define config option for processors without broadcast TLBIE Paul Mackerras
2025-01-29 6:14 ` Nicholas Piggin
2025-01-29 7:10 ` Paul Mackerras
2025-01-29 8:17 ` Nicholas Piggin
2025-01-31 17:30 ` Segher Boessenkool
2025-01-31 17:26 ` Segher Boessenkool [this message]
2025-01-28 22:55 ` [PATCH 5/5] powerpc/microwatt: Add SMP support Paul Mackerras
2025-01-29 6:21 ` Nicholas Piggin
2025-01-29 6:57 ` Paul Mackerras
2025-01-29 8:12 ` Nicholas Piggin
2025-01-31 1:27 ` Paul Mackerras
2025-01-29 12:50 ` Michael Ellerman
2025-01-31 1:34 ` Paul Mackerras
2025-01-31 16:13 ` [PATCH 0/5] Microwatt updates Segher Boessenkool
2025-02-01 1:22 ` Paul Mackerras
2025-03-02 10:13 ` Gabriel Paubert
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