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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM <linux-pm@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Subject: [PATCH 04/14] cpufreq: intel_pstate: Fold intel_pstate_reset_all_pid() into the caller
Date: Sun, 12 Mar 2017 18:15:43 +0100	[thread overview]
Message-ID: <2338812.Ydnk0pF71t@aspire.rjw.lan> (raw)
In-Reply-To: <5656785.7SEhxaGEOz@aspire.rjw.lan>

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

There is only one caller of intel_pstate_reset_all_pid(), which is
pid_param_set() used in the debugfs interface only, and having that
code split does not make it particularly convenient to follow.

For this reason, move the body of intel_pstate_reset_all_pid() into
its caller and drop that function.

Also change the loop from for_each_online_cpu() (which is obviously
racy with respect to CPU offline/online) to for_each_possible_cpu(),
so that all PID parameters are reset for all CPUs regardless of their
online/offline status (to prevent, for example, a previously offline
CPU from going online with a stale set of PID parameters).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/cpufreq/intel_pstate.c |   17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -616,16 +616,6 @@ static inline void intel_pstate_busy_pid
 	pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0);
 }
 
-static inline void intel_pstate_reset_all_pid(void)
-{
-	unsigned int cpu;
-
-	for_each_online_cpu(cpu) {
-		if (all_cpu_data[cpu])
-			intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
-	}
-}
-
 static inline void update_turbo_state(void)
 {
 	u64 misc_en;
@@ -989,9 +979,14 @@ static void intel_pstate_update_policies
 /************************** debugfs begin ************************/
 static int pid_param_set(void *data, u64 val)
 {
+	unsigned int cpu;
+
 	*(u32 *)data = val;
 	pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC;
-	intel_pstate_reset_all_pid();
+	for_each_possible_cpu(cpu)
+		if (all_cpu_data[cpu])
+			intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
+
 	return 0;
 }
 

  parent reply	other threads:[~2017-03-12 17:34 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-12 17:11 [PATCH 00/14] cpufreq: intel_pstate: Fixes, cleanups and optimizations Rafael J. Wysocki
2017-03-12 17:12 ` [PATCH 01/14] cpufreq: intel_pstate: Update pid_params.sample_rate_ns in pid_param_set() Rafael J. Wysocki
2017-03-13  4:00   ` Viresh Kumar
2017-03-12 17:13 ` [PATCH 02/14] cpufreq: intel_pstate: Drop pointless initialization of PID parameters Rafael J. Wysocki
2017-03-12 17:14 ` [PATCH 03/14] cpufreq: intel_pstate: Initialize pid_params statically Rafael J. Wysocki
2017-03-12 17:15 ` Rafael J. Wysocki [this message]
2017-03-12 17:16 ` [PATCH 05/14] cpufreq: intel_pstate: Clean up intel_pstate_busy_pid_reset() Rafael J. Wysocki
2017-03-12 17:17 ` [PATCH 06/14] cpufreq: intel_pstate: Set HWP sampling interval once Rafael J. Wysocki
2017-03-12 17:18 ` [PATCH 07/14] cpufreq: intel_pstate: Skip unnecessary PID resets on init Rafael J. Wysocki
2017-03-12 17:19 ` [PATCH 08/14] cpufreq: intel_pstate: Drop driver_registered variable Rafael J. Wysocki
2017-03-12 17:20 ` [PATCH 09/14] cpufreq: intel_pstate: Modify check in intel_pstate_update_status() Rafael J. Wysocki
2017-03-12 17:21 ` [PATCH 10/14] cpufreq: intel_pstate: Use different utilization update callbacks Rafael J. Wysocki
2017-03-12 17:22 ` [PATCH 11/14] cpufreq: intel_pstate: Add update_util callback to pstate_funcs Rafael J. Wysocki
2017-03-12 17:23 ` [PATCH 12/14] cpufreq: intel_pstate: Move cpu_defaults definitions Rafael J. Wysocki
2017-03-12 17:23 ` [PATCH 13/14] cpufreq: intel_pstate: Drop struct cpu_defaults Rafael J. Wysocki
2017-03-12 17:26 ` [PATCH 14/14] cpufreq: intel_pstate: Introduce pid_in_use() Rafael J. Wysocki
2017-03-14 16:06 ` [PATCH 07/14] cpufreq: intel_pstate: Skip unnecessary PID resets on init Doug Smythies
2017-03-14 16:40   ` Rafael J. Wysocki
2017-03-14 16:07 ` [PATCH 10/14] cpufreq: intel_pstate: Use different utilization update callbacks Doug Smythies
2017-03-14 16:41   ` Rafael J. Wysocki

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