From: Patryk Wlazlyn <patryk.wlazlyn@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, rafael.j.wysocki@intel.com,
len.brown@intel.com, artem.bityutskiy@linux.intel.com,
dave.hansen@linux.intel.com, tglx@linutronix.de,
gautham.shenoy@amd.com
Subject: Re: [RFC PATCH v4 8/8] acpi_idle: Disallow play_dead with FFH cstate on AMD platforms
Date: Mon, 25 Nov 2024 15:56:25 +0100 [thread overview]
Message-ID: <55157183-b756-454c-89b7-aba05a293b3f@linux.intel.com> (raw)
In-Reply-To: <20241125135454.GE38837@noisy.programming.kicks-ass.net>
> So I don't like this. Less exceptions is better.
>
> This *SHOULD* never trigger on AMD anyway, because they recommend IO
> port C[23]. But if their partner BIOS engineer does a wobbly and they
> end up in MWAIT anyway, it *should* all work regardless.
Agreed.
I thought relaying on BIOS to not put FFH states there was a concern.
I believe Gautham confirmed that AMD would be fine executing that,
it's just that they prefer ioidle (or hlt?).
next prev parent reply other threads:[~2024-11-25 14:56 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-25 13:20 [RFC PATCH v4 0/8] SRF: Fix offline CPU preventing pc6 entry Patryk Wlazlyn
2024-11-25 13:20 ` [RFC PATCH v4 1/8] cpuidle: Do not return from cpuidle_play_dead() on callback failures Patryk Wlazlyn
2024-11-25 13:26 ` Rafael J. Wysocki
2024-11-25 14:36 ` Patryk Wlazlyn
2024-11-25 13:20 ` [RFC PATCH v4 2/8] cpuidle: Change :enter_dead() driver callback return type to void Patryk Wlazlyn
2024-11-25 13:20 ` [RFC PATCH v4 3/8] ACPI: processor_idle: Use acpi_idle_play_dead() for all C-states Patryk Wlazlyn
2024-11-25 13:24 ` Rafael J. Wysocki
2024-11-25 14:39 ` Patryk Wlazlyn
2024-11-25 14:36 ` Gautham R. Shenoy
2024-11-25 13:20 ` [RFC PATCH v4 4/8] x86/smp: Allow calling mwait_play_dead with arbitrary hint Patryk Wlazlyn
2024-11-25 14:39 ` Rafael J. Wysocki
2024-11-26 11:36 ` Patryk Wlazlyn
2024-11-26 11:45 ` Rafael J. Wysocki
2024-11-25 13:20 ` [RFC PATCH v4 5/8] x86/smp native_play_dead: Prefer cpuidle_play_dead() over mwait_play_dead() Patryk Wlazlyn
2024-11-25 13:45 ` Peter Zijlstra
2024-11-25 13:56 ` Rafael J. Wysocki
2024-11-25 14:43 ` Patryk Wlazlyn
2024-11-25 14:48 ` Rafael J. Wysocki
2024-11-26 11:56 ` Patryk Wlazlyn
2024-11-26 12:04 ` Rafael J. Wysocki
2024-11-26 13:10 ` Patryk Wlazlyn
2024-11-26 13:38 ` Rafael J. Wysocki
2024-11-25 13:20 ` [RFC PATCH v4 6/8] intel_idle: Provide enter_dead() handler for SRF Patryk Wlazlyn
2024-11-25 13:44 ` Rafael J. Wysocki
2024-11-25 14:48 ` Patryk Wlazlyn
2024-11-25 14:50 ` Rafael J. Wysocki
2024-11-25 13:53 ` Peter Zijlstra
2024-11-25 13:58 ` Rafael J. Wysocki
2024-11-25 14:12 ` Peter Zijlstra
2024-11-25 14:19 ` Rafael J. Wysocki
2024-11-25 13:20 ` [RFC PATCH v4 7/8] acpi_idle: Add FFH cstate handling Patryk Wlazlyn
2024-11-25 13:41 ` Rafael J. Wysocki
2024-11-25 14:00 ` Rafael J. Wysocki
2024-11-25 15:14 ` Gautham R. Shenoy
2024-11-26 12:03 ` Patryk Wlazlyn
2024-11-25 13:20 ` [RFC PATCH v4 8/8] acpi_idle: Disallow play_dead with FFH cstate on AMD platforms Patryk Wlazlyn
2024-11-25 13:46 ` Rafael J. Wysocki
2024-11-25 13:54 ` Peter Zijlstra
2024-11-25 14:56 ` Patryk Wlazlyn [this message]
2024-11-25 15:17 ` Gautham R. Shenoy
2024-11-25 15:15 ` Gautham R. Shenoy
2024-11-26 12:05 ` Patryk Wlazlyn
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