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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-17 05:17:22 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-17 05:17:22 +0300
commitd57d39431924d1628ac9b93a2de7f806fc80680a (patch)
tree8d630b5b22333a6368beb3531f20ae5c5eb72229 /drivers/cpufreq/longhaul.c
parent3e21e5dda4907ecb21a124517ab0eb1d176e5231 (diff)
parent27c4a1c5ef61b6d4a9aeae68b24419b4319b97ed (diff)
downloadlinux-d57d39431924d1628ac9b93a2de7f806fc80680a.tar.xz
Merge tag 'pm-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management updates from Rafael Wysocki: "The majority of changes go into the cpufreq subsystem this time. To me, quite obviously, the biggest ticket item is the new "schedutil" governor. Interestingly enough, it's the first new cpufreq governor since the beginning of the git era (except for some out-of-the-tree ones). There are two main differences between it and the existing governors. First, it uses the information provided by the scheduler directly for making its decisions, so it doesn't have to track anything by itself. Second, it can invoke drivers (supporting that feature) to adjust CPU performance right away without having to spawn work items to be executed in process context or similar. Currently, the acpi-cpufreq driver is the only one supporting that mode of operation, but then it is used on a large number of systems. The "schedutil" governor as included here is very simple and mostly regarded as a foundation for future work on the integration of the scheduler with CPU power management (in fact, there is work in progress on top of it already). Nevertheless it works and the preliminary results obtained with it are encouraging. There also is some consolidation of CPU frequency management for ARM platforms that can add their machine IDs the the new stub dt-platdev driver now and that will take care of creating the requisite platform device for cpufreq-dt, so it is not necessary to do that in platform code any more. Several ARM platforms are switched over to using this generic mechanism. In addition to that, the intel_pstate driver is now going to respect CPU frequency limits set by the platform firmware (or a BMC) and provided via the ACPI _PPC object. The devfreq subsystem is getting a new "passive" governor for SoCs subsystems that will depend on somebody else to manage their voltage rails and its support for Samsung Exynos SoCs is consolidated. The rest is support for new hardware (Intel Broxton support in intel_idle for one example), bug fixes, optimizations and cleanups in a number of places. Specifics: - New cpufreq "schedutil" governor (making decisions based on CPU utilization information provided by the scheduler and capable of switching CPU frequencies right away if the underlying driver supports that) and support for fast frequency switching in the acpi-cpufreq driver (Rafael Wysocki) - Consolidation of CPU frequency management on ARM platforms allowing them to get rid of some platform-specific boilerplate code if they are going to use the cpufreq-dt driver (Viresh Kumar, Finley Xiao, Marc Gonzalez) - Support for ACPI _PPC and CPU frequency limits in the intel_pstate driver (Srinivas Pandruvada) - Fixes and cleanups in the cpufreq core and generic governor code (Rafael Wysocki, Sai Gurrappadi) - intel_pstate driver optimizations and cleanups (Rafael Wysocki, Philippe Longepe, Chen Yu, Joe Perches) - cpufreq powernv driver fixes and cleanups (Akshay Adiga, Shilpasri Bhat) - cpufreq qoriq driver fixes and cleanups (Jia Hongtao) - ACPI cpufreq driver cleanups (Viresh Kumar) - Assorted cpufreq driver updates (Ashwin Chaugule, Geliang Tang, Javier Martinez Canillas, Paul Gortmaker, Sudeep Holla) - Assorted cpufreq fixes and cleanups (Joe Perches, Arnd Bergmann) - Fixes and cleanups in the OPP (Operating Performance Points) framework, mostly related to OPP sharing, and reorganization of OF-dependent code in it (Viresh Kumar, Arnd Bergmann, Sudeep Holla) - New "passive" governor for devfreq (for SoC subsystems that will rely on someone else for the management of their power resources) and consolidation of devfreq support for Exynos platforms, coding style and typo fixes for devfreq (Chanwoo Choi, MyungJoo Ham) - PM core fixes and cleanups, mostly to make it work better with the generic power domains (genpd) framework, and updates for that framework (Ulf Hansson, Thierry Reding, Colin Ian King) - Intel Broxton support for the intel_idle driver (Len Brown) - cpuidle core optimization and fix (Daniel Lezcano, Dave Gerlach) - ARM cpuidle cleanups (Jisheng Zhang) - Intel Kabylake support for the RAPL power capping driver (Jacob Pan) - AVS (Adaptive Voltage Switching) rockchip-io driver update (Heiko Stuebner) - Updates for the cpupower tool (Arjun Sreedharan, Colin Ian King, Mattia Dongili, Thomas Renninger)" * tag 'pm-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (112 commits) intel_pstate: Clean up get_target_pstate_use_performance() intel_pstate: Use sample.core_avg_perf in get_avg_pstate() intel_pstate: Clarify average performance computation intel_pstate: Avoid unnecessary synchronize_sched() during initialization cpufreq: schedutil: Make default depend on CONFIG_SMP cpufreq: powernv: del_timer_sync when global and local pstate are equal cpufreq: powernv: Move smp_call_function_any() out of irq safe block intel_pstate: Clean up intel_pstate_get() cpufreq: schedutil: Make it depend on CONFIG_SMP cpufreq: governor: Fix handling of special cases in dbs_update() PM / OPP: Move CONFIG_OF dependent code in a separate file cpufreq: intel_pstate: Ignore _PPC processing under HWP cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table PM / OPP: add non-OF versions of dev_pm_opp_{cpumask_, }remove_table cpufreq: tango: Use generic platdev driver PM / OPP: pass cpumask by reference cpufreq: Fix GOV_LIMITS handling for the userspace governor cpupower: fix potential memory leak PM / devfreq: style/typo fixes PM / devfreq: exynos: Add the detailed correlation for Exynos5422 bus ..
Diffstat (limited to 'drivers/cpufreq/longhaul.c')
-rw-r--r--drivers/cpufreq/longhaul.c84
1 files changed, 35 insertions, 49 deletions
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index 247bfa8eaddb..c46a12df40dd 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -21,6 +21,8 @@
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
@@ -40,8 +42,6 @@
#include "longhaul.h"
-#define PFX "longhaul: "
-
#define TYPE_LONGHAUL_V1 1
#define TYPE_LONGHAUL_V2 2
#define TYPE_POWERSAVER 3
@@ -347,14 +347,13 @@ retry_loop:
freqs.new = calc_speed(longhaul_get_cpu_mult());
/* Check if requested frequency is set. */
if (unlikely(freqs.new != speed)) {
- printk(KERN_INFO PFX "Failed to set requested frequency!\n");
+ pr_info("Failed to set requested frequency!\n");
/* Revision ID = 1 but processor is expecting revision key
* equal to 0. Jumpers at the bottom of processor will change
* multiplier and FSB, but will not change bits in Longhaul
* MSR nor enable voltage scaling. */
if (!revid_errata) {
- printk(KERN_INFO PFX "Enabling \"Ignore Revision ID\" "
- "option.\n");
+ pr_info("Enabling \"Ignore Revision ID\" option\n");
revid_errata = 1;
msleep(200);
goto retry_loop;
@@ -364,11 +363,10 @@ retry_loop:
* but it doesn't change frequency. I tried poking various
* bits in northbridge registers, but without success. */
if (longhaul_flags & USE_ACPI_C3) {
- printk(KERN_INFO PFX "Disabling ACPI C3 support.\n");
+ pr_info("Disabling ACPI C3 support\n");
longhaul_flags &= ~USE_ACPI_C3;
if (revid_errata) {
- printk(KERN_INFO PFX "Disabling \"Ignore "
- "Revision ID\" option.\n");
+ pr_info("Disabling \"Ignore Revision ID\" option\n");
revid_errata = 0;
}
msleep(200);
@@ -379,7 +377,7 @@ retry_loop:
* RevID = 1. RevID errata will make things right. Just
* to be 100% sure. */
if (longhaul_version == TYPE_LONGHAUL_V2) {
- printk(KERN_INFO PFX "Switching to Longhaul ver. 1\n");
+ pr_info("Switching to Longhaul ver. 1\n");
longhaul_version = TYPE_LONGHAUL_V1;
msleep(200);
goto retry_loop;
@@ -387,8 +385,7 @@ retry_loop:
}
if (!bm_timeout) {
- printk(KERN_INFO PFX "Warning: Timeout while waiting for "
- "idle PCI bus.\n");
+ pr_info("Warning: Timeout while waiting for idle PCI bus\n");
return -EBUSY;
}
@@ -433,12 +430,12 @@ static int longhaul_get_ranges(void)
/* Get current frequency */
mult = longhaul_get_cpu_mult();
if (mult == -1) {
- printk(KERN_INFO PFX "Invalid (reserved) multiplier!\n");
+ pr_info("Invalid (reserved) multiplier!\n");
return -EINVAL;
}
fsb = guess_fsb(mult);
if (fsb == 0) {
- printk(KERN_INFO PFX "Invalid (reserved) FSB!\n");
+ pr_info("Invalid (reserved) FSB!\n");
return -EINVAL;
}
/* Get max multiplier - as we always did.
@@ -468,11 +465,11 @@ static int longhaul_get_ranges(void)
print_speed(highest_speed/1000));
if (lowest_speed == highest_speed) {
- printk(KERN_INFO PFX "highestspeed == lowest, aborting.\n");
+ pr_info("highestspeed == lowest, aborting\n");
return -EINVAL;
}
if (lowest_speed > highest_speed) {
- printk(KERN_INFO PFX "nonsense! lowest (%d > %d) !\n",
+ pr_info("nonsense! lowest (%d > %d) !\n",
lowest_speed, highest_speed);
return -EINVAL;
}
@@ -538,16 +535,16 @@ static void longhaul_setup_voltagescaling(void)
rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
if (!(longhaul.bits.RevisionID & 1)) {
- printk(KERN_INFO PFX "Voltage scaling not supported by CPU.\n");
+ pr_info("Voltage scaling not supported by CPU\n");
return;
}
if (!longhaul.bits.VRMRev) {
- printk(KERN_INFO PFX "VRM 8.5\n");
+ pr_info("VRM 8.5\n");
vrm_mV_table = &vrm85_mV[0];
mV_vrm_table = &mV_vrm85[0];
} else {
- printk(KERN_INFO PFX "Mobile VRM\n");
+ pr_info("Mobile VRM\n");
if (cpu_model < CPU_NEHEMIAH)
return;
vrm_mV_table = &mobilevrm_mV[0];
@@ -558,27 +555,21 @@ static void longhaul_setup_voltagescaling(void)
maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
- printk(KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
- "Voltage scaling disabled.\n",
- minvid.mV/1000, minvid.mV%1000,
- maxvid.mV/1000, maxvid.mV%1000);
+ pr_info("Bogus values Min:%d.%03d Max:%d.%03d - Voltage scaling disabled\n",
+ minvid.mV/1000, minvid.mV%1000,
+ maxvid.mV/1000, maxvid.mV%1000);
return;
}
if (minvid.mV == maxvid.mV) {
- printk(KERN_INFO PFX "Claims to support voltage scaling but "
- "min & max are both %d.%03d. "
- "Voltage scaling disabled\n",
- maxvid.mV/1000, maxvid.mV%1000);
+ pr_info("Claims to support voltage scaling but min & max are both %d.%03d - Voltage scaling disabled\n",
+ maxvid.mV/1000, maxvid.mV%1000);
return;
}
/* How many voltage steps*/
numvscales = maxvid.pos - minvid.pos + 1;
- printk(KERN_INFO PFX
- "Max VID=%d.%03d "
- "Min VID=%d.%03d, "
- "%d possible voltage scales\n",
+ pr_info("Max VID=%d.%03d Min VID=%d.%03d, %d possible voltage scales\n",
maxvid.mV/1000, maxvid.mV%1000,
minvid.mV/1000, minvid.mV%1000,
numvscales);
@@ -617,12 +608,12 @@ static void longhaul_setup_voltagescaling(void)
pos = minvid.pos;
freq_pos->driver_data |= mV_vrm_table[pos] << 8;
vid = vrm_mV_table[mV_vrm_table[pos]];
- printk(KERN_INFO PFX "f: %d kHz, index: %d, vid: %d mV\n",
+ pr_info("f: %d kHz, index: %d, vid: %d mV\n",
speed, (int)(freq_pos - longhaul_table), vid.mV);
}
can_scale_voltage = 1;
- printk(KERN_INFO PFX "Voltage scaling enabled.\n");
+ pr_info("Voltage scaling enabled\n");
}
@@ -720,8 +711,7 @@ static int enable_arbiter_disable(void)
pci_write_config_byte(dev, reg, pci_cmd);
pci_read_config_byte(dev, reg, &pci_cmd);
if (!(pci_cmd & 1<<7)) {
- printk(KERN_ERR PFX
- "Can't enable access to port 0x22.\n");
+ pr_err("Can't enable access to port 0x22\n");
status = 0;
}
}
@@ -758,8 +748,7 @@ static int longhaul_setup_southbridge(void)
if (pci_cmd & 1 << 7) {
pci_read_config_dword(dev, 0x88, &acpi_regs_addr);
acpi_regs_addr &= 0xff00;
- printk(KERN_INFO PFX "ACPI I/O at 0x%x\n",
- acpi_regs_addr);
+ pr_info("ACPI I/O at 0x%x\n", acpi_regs_addr);
}
pci_dev_put(dev);
@@ -853,14 +842,14 @@ static int longhaul_cpu_init(struct cpufreq_policy *policy)
longhaul_version = TYPE_LONGHAUL_V1;
}
- printk(KERN_INFO PFX "VIA %s CPU detected. ", cpuname);
+ pr_info("VIA %s CPU detected. ", cpuname);
switch (longhaul_version) {
case TYPE_LONGHAUL_V1:
case TYPE_LONGHAUL_V2:
- printk(KERN_CONT "Longhaul v%d supported.\n", longhaul_version);
+ pr_cont("Longhaul v%d supported\n", longhaul_version);
break;
case TYPE_POWERSAVER:
- printk(KERN_CONT "Powersaver supported.\n");
+ pr_cont("Powersaver supported\n");
break;
};
@@ -889,15 +878,14 @@ static int longhaul_cpu_init(struct cpufreq_policy *policy)
if (!(longhaul_flags & USE_ACPI_C3
|| longhaul_flags & USE_NORTHBRIDGE)
&& ((pr == NULL) || !(pr->flags.bm_control))) {
- printk(KERN_ERR PFX
- "No ACPI support. Unsupported northbridge.\n");
+ pr_err("No ACPI support: Unsupported northbridge\n");
return -ENODEV;
}
if (longhaul_flags & USE_NORTHBRIDGE)
- printk(KERN_INFO PFX "Using northbridge support.\n");
+ pr_info("Using northbridge support\n");
if (longhaul_flags & USE_ACPI_C3)
- printk(KERN_INFO PFX "Using ACPI support.\n");
+ pr_info("Using ACPI support\n");
ret = longhaul_get_ranges();
if (ret != 0)
@@ -934,20 +922,18 @@ static int __init longhaul_init(void)
return -ENODEV;
if (!enable) {
- printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n");
+ pr_err("Option \"enable\" not set - Aborting\n");
return -ENODEV;
}
#ifdef CONFIG_SMP
if (num_online_cpus() > 1) {
- printk(KERN_ERR PFX "More than 1 CPU detected, "
- "longhaul disabled.\n");
+ pr_err("More than 1 CPU detected, longhaul disabled\n");
return -ENODEV;
}
#endif
#ifdef CONFIG_X86_IO_APIC
if (boot_cpu_has(X86_FEATURE_APIC)) {
- printk(KERN_ERR PFX "APIC detected. Longhaul is currently "
- "broken in this configuration.\n");
+ pr_err("APIC detected. Longhaul is currently broken in this configuration.\n");
return -ENODEV;
}
#endif
@@ -955,7 +941,7 @@ static int __init longhaul_init(void)
case 6 ... 9:
return cpufreq_register_driver(&longhaul_driver);
case 10:
- printk(KERN_ERR PFX "Use acpi-cpufreq driver for VIA C7\n");
+ pr_err("Use acpi-cpufreq driver for VIA C7\n");
default:
;
}