linux-kernel - Re: [PATCH v6 0/6] AMD Pstate Fixes And Enhancements

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Date: Fri, 9 Feb 2024 16:51:19 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Deucher, Alexander" <Alexander.Deucher@....com>
Cc: "Yuan, Perry" <Perry.Yuan@....com>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	"Limonciello, Mario" <Mario.Limonciello@....com>,
	"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
	"Huang, Ray" <Ray.Huang@....com>,
	"Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
	"Huang, Shimmer" <Shimmer.Huang@....com>,
	"Du, Xiaojian" <Xiaojian.Du@....com>,
	"Meng, Li (Jassmine)" <Li.Meng@....com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 0/6] AMD Pstate Fixes And Enhancements

On Thu, Feb 08, 2024 at 11:09:47PM +0000, Deucher, Alexander wrote:
> Why?

Because we have those rules, you know. You should send about once a week,
unless you've reworked your set fundamentally.

Otherwise maintainers mailboxes would be a serious mess. Not that
they're already such now...

> In this case, there have been a number of review comments which have
> been addressed in the new revisions of the patch set.  Why delay the
> new revisions?

See above.

And see below for the "whopping" differences between the last two.

> You'll ultimately get the same amount of email just with a much longer
> latency.

No, you'll have a lot less email. You send the set, sit tight and
collect review feedback, work it in and send again after a week or so.

diff v5..v6 - definitely not resend one day later just to pick up tags.
-----------
--- v5_20240207_perry_yuan_amd_pstate_fixes_and_enhancements.mbx	2024-02-09 16:43:29.487104935 +0100
+++ v6_20240208_perry_yuan_amd_pstate_fixes_and_enhancements.mbx	2024-02-09 16:42:55.671303380 +0100
@@ -23,6 +23,7 @@ Reported-by: Gino Badouri <badouri.g@gma
 Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218171
 Fixes: fbd74d1689 ("ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory")
 Signed-off-by: Perry Yuan <perry.yuan@....com>
+Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
 ---
  arch/x86/kernel/acpi/cppc.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)
@@ -293,6 +294,7 @@ Above message is not clear enough to ver
 
 Reviewed-by: Mario Limonciello <mario.limonciello@....com>
 Signed-off-by: Perry Yuan <perry.yuan@....com>
+Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
 ---
  drivers/acpi/cppc_acpi.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)
@@ -342,8 +344,9 @@ $ cat /sys/devices/system/cpu/cpu0/acpi_
 $ cat /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq
 0
 
-Signed-off-by: Perry Yuan <perry.yuan@....com>
 Reviewed-by: Mario Limonciello <mario.limonciello@....com>
+Signed-off-by: Perry Yuan <perry.yuan@....com>
+Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
 ---
  drivers/cpufreq/amd-pstate.c | 57 ++++++++++++++++++++++++++++++++++--
  include/linux/amd-pstate.h   |  6 ++++


diff v4..v5 - *definitely* *not* warranting a new resend on the next
day!
-----------
--- v4_20240206_perry_yuan_amd_pstate_fixes_and_enhancements.mbx	2024-02-09 16:43:53.922961536 +0100
+++ v5_20240207_perry_yuan_amd_pstate_fixes_and_enhancements.mbx	2024-02-09 16:43:29.487104935 +0100
@@ -343,13 +343,14 @@ $ cat /sys/devices/system/cpu/cpu0/acpi_
 0
 
 Signed-off-by: Perry Yuan <perry.yuan@....com>
+Reviewed-by: Mario Limonciello <mario.limonciello@....com>
 ---
- drivers/cpufreq/amd-pstate.c | 59 ++++++++++++++++++++++++++++++++++--
+ drivers/cpufreq/amd-pstate.c | 57 ++++++++++++++++++++++++++++++++++--
  include/linux/amd-pstate.h   |  6 ++++
- 2 files changed, 63 insertions(+), 2 deletions(-)
+ 2 files changed, 61 insertions(+), 2 deletions(-)
 
 diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
-index 77effc3caf6c..874d8b663790 100644
+index 77effc3caf6c..ff4727c22dce 100644
 --- a/drivers/cpufreq/amd-pstate.c
 +++ b/drivers/cpufreq/amd-pstate.c
 @@ -67,6 +67,7 @@ static struct cpufreq_driver amd_pstate_epp_driver;
@@ -372,18 +373,16 @@ index 77effc3caf6c..874d8b663790 100644
 +static int __init dmi_matched_7k62_bios_bug(const struct dmi_system_id *dmi)
 +{
 +	/**
-+	 * match the broken bios for family 17h, model 31h processor
++	 * match the broken bios for family 17h processor support CPPC V2
 +	 * broken BIOS lack of nominal_freq and lowest_freq capabilities
 +	 * definition in ACPI tables
 +	 */
-+	if (boot_cpu_data.x86 == 0x17 && boot_cpu_data.x86_model == 0x31 &&
-+			boot_cpu_has(X86_FEATURE_ZEN2)) {
++	if (boot_cpu_has(X86_FEATURE_ZEN2)) {
 +		quirks = dmi->driver_data;
-+		pr_info("hardware type %s found\n", dmi->ident);
++		pr_info("Overriding nominal and lowest frequencies for %s\n", dmi->ident);
 +		return 1;
 +	}
 +
-+
 +	return 0;
 +}
 +

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette