From: Dave Hansen <dave.hansen@intel.com>
To: Sohil Mehta <sohil.mehta@intel.com>,
x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>,
Tony Luck <tony.luck@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Kan Liang <kan.liang@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>, Andy Lutomirski <luto@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Fenghua Yu <fenghua.yu@intel.com>,
Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
Zhang Rui <rui.zhang@intel.com>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
linux-hwmon@vger.kernel.org
Subject: Re: [RFC PATCH 02/15] x86/apic: Fix smp init delay for extended Intel families
Date: Fri, 20 Dec 2024 15:20:35 -0800 [thread overview]
Message-ID: <0875ab7b-0595-4195-924c-66da28074ef6@intel.com> (raw)
In-Reply-To: <20241220213711.1892696-3-sohil.mehta@intel.com>
On 12/20/24 13:36, Sohil Mehta wrote:
> The MP specification version 1.4 references the i486 and early Pentium
> processors in family 5.
Can you please elaborate on how this reference is relevant to the patch
at hand?
> However, all processors starting with family 6 likely do not need the
> 10 msec INIT delay. The omission of the Pentium 4s (family 15) seems
> like an oversight in the original check.
>
> With some risk, choose a simpler check and extend the quirk to all
> recent and upcoming Intel processors.
I'm struggling to follow this a bit.
I think these are the facts that matter:
* init_udelay=0 means "no quirk"
* Modern CPUs don't have the quirk
* The current check says "only family 6 is modern"
* Family 15 is _probably_ modern and just forgotten about
And this is what you're doing in the end:
Consider everything PPro and later to be modern, including all of
families 6, 15 and the new 18/19 CPUs.
Right?
next prev parent reply other threads:[~2024-12-20 23:20 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-20 21:36 [RFC PATCH 00/15] Prepare for new Intel family models Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 01/15] x86/apic: Fix 32-bit APIC initialization for extended Intel families Sohil Mehta
2024-12-20 23:13 ` Dave Hansen
2024-12-23 20:40 ` Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 02/15] x86/apic: Fix smp init delay " Sohil Mehta
2024-12-20 23:20 ` Dave Hansen [this message]
2024-12-23 21:55 ` Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 03/15] x86/cpu/intel: Fix init_intel() checks for extended family numbers Sohil Mehta
2024-12-20 23:27 ` Dave Hansen
2024-12-23 23:41 ` Sohil Mehta
2024-12-20 21:36 ` [RFC PATCH 04/15] cpufreq: Fix the efficient idle check for Intel extended families Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 05/15] hwmon: Fix Intel family checks to include extended family numbers Sohil Mehta
2024-12-21 17:27 ` Guenter Roeck
2024-12-23 18:13 ` Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 06/15] x86/microcode: Update the Intel processor flag scan check Sohil Mehta
2024-12-21 9:11 ` Borislav Petkov
2024-12-23 19:52 ` Sohil Mehta
2024-12-21 15:46 ` Dave Hansen
2024-12-20 21:37 ` [RFC PATCH 07/15] x86/mtrr: Modify a x86_model check to an Intel VFM check Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 08/15] x86/cpu/intel: Replace early family 6 checks with VFM ones Sohil Mehta
2024-12-21 10:35 ` David Laight
2024-12-21 15:57 ` Dave Hansen
2024-12-21 16:48 ` David Laight
2024-12-21 18:30 ` Dave Hansen
2024-12-23 20:13 ` Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 09/15] x86/cpu/intel: Replace family 15 " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 10/15] x86/cpu/intel: Replace family 5 model " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 11/15] x86/pat: Replace Intel " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 12/15] x86/acpi/cstate: Improve Intel family model checks Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 13/15] x86/cpu/intel: Bound the non-architectural constant_tsc " Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 14/15] perf/x86: Simplify p6_pmu_init() Sohil Mehta
2024-12-20 21:37 ` [RFC PATCH 15/15] perf/x86/p4: Replace Pentium 4 model checks with VFM ones Sohil Mehta
2024-12-21 0:29 ` [RFC PATCH 00/15] Prepare for new Intel family models Andrew Cooper
2024-12-23 19:43 ` Sohil Mehta
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