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linux/drivers/cpufreq
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Petr Pavlu 691a637123 ACPI: cpufreq: Use platform devices to load ACPI PPC and PCC drivers 
The acpi-cpufreq and pcc-cpufreq drivers are loaded through per-CPU
module aliases. This can result in many unnecessary load requests during
boot if another frequency module, such as intel_pstate, is already
active. For instance, on a typical Intel system, one can observe that
udev makes 2x#CPUs attempts to insert acpi_cpufreq and 1x#CPUs attempts
for pcc_cpufreq. All these tries then fail if another frequency module
is already registered.

In the worst case, without the recent fix in commit 0254127ab9
("module: Don't wait for GOING modules"), these module loads occupied
all udev workers and had their initialization attempts ran sequentially.
Resolving all these loads then on some larger machines took too long,
prevented other hardware from getting its drivers initialized and
resulted in a failed boot. Discussion over these duplicate module
requests ended up with a conclusion that only one load attempt should be
ideally made.

Both acpi-cpufreq and pcc-cpufreq drivers use platform firmware controls
which are defined by ACPI. It is possible to treat these interfaces as
platform devices.

The patch extends the ACPI parsing logic to check the ACPI namespace if
the PPC or PCC interface is present and creates a virtual platform
device for each if it is available. The acpi-cpufreq and pcc-cpufreq
drivers are then updated to map to these devices.

This allows to try loading acpi-cpufreq and pcc-cpufreq only once during
boot and only if a given interface is available in the firmware.

Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
[ rjw: whitespace and error message log level adjustments, subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-03-20 18:54:13 +01:00
..
acpi-cpufreq.c ACPI: cpufreq: Use platform devices to load ACPI PPC and PCC drivers 2023-03-20 18:54:13 +01:00
amd-pstate-trace.c cpufreq: amd-pstate: Add trace for AMD P-State module 2021-12-30 18:51:39 +01:00
amd-pstate-trace.h cpufreq: amd-pstate: Add more tracepoint for AMD P-State module 2022-03-09 19:53:01 +01:00
amd-pstate-ut.c cpufreq: amd-pstate: fix spdxcheck warnings for amd-pstate-ut.c 2022-11-16 08:38:19 -07:00
amd-pstate.c cpufreq: amd-pstate: remove MODULE_LICENSE in non-modules 2023-02-23 20:01:23 +01:00
amd_freq_sensitivity.c cpufreq: amd_freq_sensitivity: Add missing pci_dev_put() 2022-11-30 19:50:04 +01:00
apple-soc-cpufreq.c cpufreq: apple-soc: Fix an IS_ERR() vs NULL check 2023-03-01 19:34:54 +01:00
armada-8k-cpufreq.c cpufreq: ap806: Add missing MODULE_DEVICE_TABLE 2020-12-07 13:02:37 +05:30
armada-37xx-cpufreq.c cpufreq: armada-37xx: stop using 0 as NULL pointer 2023-01-10 09:32:03 +05:30
bmips-cpufreq.c cpufreq: bmips-cpufreq: Use module_init and add module_exit 2022-08-30 13:49:23 +05:30
brcmstb-avs-cpufreq.c cpufreq: Make cpufreq_unregister_driver() return void 2023-02-09 20:19:18 +01:00
cppc_cpufreq.c cpufreq: CPPC: Add u64 casts to avoid overflowing 2022-12-27 08:27:14 +05:30
cpufreq-dt-platdev.c cpufreq: Add SM6375 to cpufreq-dt-platdev blocklist 2023-01-04 12:05:06 +05:30
cpufreq-dt.c cpufreq: dt: Switch to use dev_err_probe() helper 2022-10-18 16:22:25 +05:30
cpufreq-dt.h cpufreq: dt: Allow platform specific intermediate callbacks 2020-03-12 15:43:52 +05:30
cpufreq-nforce2.c
cpufreq.c cpufreq: Make kobj_type structure constant 2023-02-09 20:29:32 +01:00
cpufreq_conservative.c cpufreq: unify show() and store() naming and use __ATTR_XX 2022-03-10 19:55:05 +01:00
cpufreq_governor.c cpufreq: governor: Use kobject release() method to free dbs_data 2022-04-13 15:22:41 +02:00
cpufreq_governor.h cpufreq: governor: Use kobject release() method to free dbs_data 2022-04-13 15:22:41 +02:00
cpufreq_governor_attr_set.c cpufreq: Move to_gov_attr_set() to cpufreq.h 2022-02-04 19:22:34 +01:00
cpufreq_ondemand.c cpufreq: ondemand: Use cpumask_var_t for on-stack cpu mask 2022-07-25 20:38:01 +02:00
cpufreq_ondemand.h
cpufreq_performance.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_powersave.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_stats.c cpufreq: stats: Convert to use sysfs_emit_at() API 2022-12-06 12:20:07 +01:00
cpufreq_userspace.c cpufreq: Register governors at core_initcall 2020-07-02 13:03:30 +02:00
davinci-cpufreq.c cpufreq: davinci: Fix clk use after free 2023-02-09 20:26:42 +01:00
e_powersaver.c cpufreq: e_powersaver: remove unreachable break 2020-10-27 18:42:54 +01:00
elanfreq.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
freq_table.c cpufreq: Fix scaling_{available,boost}_frequencies_show() comments 2021-03-26 17:43:48 +01:00
gx-suspmod.c
highbank-cpufreq.c cpufreq: Add __init annotation to module init funcs 2022-09-26 11:15:04 +05:30
ia64-acpi-cpufreq.c ia64: fix format string for ia64-acpi-cpu-freq 2021-03-19 17:26:20 +01:00
imx-cpufreq-dt.c OPP: Migrate set-supported-hw API to use set-config helpers 2022-07-08 11:27:48 +05:30
imx6q-cpufreq.c cpufreq: imx6q: Switch to use dev_err_probe() helper 2022-10-18 16:22:25 +05:30
intel_pstate.c More power management updates for 6.3-rc1 2023-03-03 10:30:58 -08:00
Kconfig Power management updates for 6.3-rc1 2023-02-21 12:13:58 -08:00
Kconfig.arm cpufreq: remove s3c24xx drivers 2023-01-16 09:26:06 +01:00
Kconfig.powerpc
Kconfig.x86 cpufreq: amd-pstate: change amd-pstate driver to be built-in type 2022-11-22 19:57:15 +01:00
kirkwood-cpufreq.c
longhaul.c cpufreq: longhaul: Make array speeds static const 2022-11-03 19:13:34 +01:00
longhaul.h
longrun.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
loongson2_cpufreq.c cpufreq: loongson2: Remove unused linux/sched.h headers 2021-06-07 17:43:52 +02:00
Makefile Power management updates for 6.3-rc1 2023-02-21 12:13:58 -08:00
maple-cpufreq.c
mediatek-cpufreq-hw.c Cpufreq arm updates for 6.3 2023-02-14 15:25:07 +01:00
mediatek-cpufreq.c cpufreq: mediatek: fix error return code in mtk_cpu_dvfs_info_init() 2022-07-13 16:53:00 +05:30
mvebu-cpufreq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 2) 2022-06-10 14:51:35 +02:00
omap-cpufreq.c cpufreq: Make cpufreq_unregister_driver() return void 2023-02-09 20:19:18 +01:00
p4-clockmod.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pasemi-cpufreq.c cpufreq: Prepare cleanup of powerpc's asm/prom.h 2022-04-13 17:18:45 +02:00
pcc-cpufreq.c ACPI: cpufreq: Use platform devices to load ACPI PPC and PCC drivers 2023-03-20 18:54:13 +01:00
pmac32-cpufreq.c cpufreq: pmac32-cpufreq: Fix refcount leak bug 2022-06-28 13:34:51 +05:30
pmac64-cpufreq.c cpufreq: Prepare cleanup of powerpc's asm/prom.h 2022-04-13 17:18:45 +02:00
powernow-k6.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
powernow-k7.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
powernow-k7.h
powernow-k8.c cpufreq: powernow-k8: Re-order the init checks 2022-03-17 14:54:11 +01:00
powernow-k8.h
powernv-cpufreq.c cpufreq: Introducing CPUFREQ_RELATION_E 2021-10-05 16:33:05 +02:00
ppc_cbe_cpufreq.c cpufreq: Prepare cleanup of powerpc's asm/prom.h 2022-04-13 17:18:45 +02:00
ppc_cbe_cpufreq.h
ppc_cbe_cpufreq_pervasive.c
ppc_cbe_cpufreq_pmi.c cpufreq: Prepare cleanup of powerpc's asm/prom.h 2022-04-13 17:18:45 +02:00
pxa2xx-cpufreq.c cpufreq: pxa3: move clk register access to clk driver 2022-05-07 22:55:49 +02:00
pxa3xx-cpufreq.c cpufreq: pxa3: move clk register access to clk driver 2022-05-07 22:55:49 +02:00
qcom-cpufreq-hw.c Merge back cpufreq material for 6.3-rc1. 2023-02-14 15:22:31 +01:00
qcom-cpufreq-nvmem.c cpufreq: qcom-nvmem: Switch to use dev_err_probe() helper 2022-10-18 16:22:26 +05:30
qoriq-cpufreq.c drivers: cpufreq: Add missing of_node_put() in qoriq-cpufreq.c 2022-06-28 13:34:45 +05:30
raspberrypi-cpufreq.c
s3c64xx-cpufreq.c
s5pv210-cpufreq.c cpufreq: Introducing CPUFREQ_RELATION_E 2021-10-05 16:33:05 +02:00
sa1110-cpufreq.c ARM: sa1100: remove unused board files 2023-01-12 10:53:12 +01:00
sc520_freq.c cpufreq: sc520_freq: add 'fallthrough' to one case 2021-05-21 18:52:13 +02:00
scmi-cpufreq.c cpufreq: scmi: Support the power scale in micro-Watts in SCMI v3.1 2022-07-15 19:17:30 +02:00
scpi-cpufreq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_320.RULE 2022-06-10 14:51:36 +02:00
sh-cpufreq.c cpufreq: sh: Remove sh_cpufreq_cpu_ready() 2021-09-02 18:04:17 +02:00
sparc-us2e-cpufreq.c
sparc-us3-cpufreq.c
spear-cpufreq.c cpufreq: SPEAr: Make read-only array sys_clk_src static 2022-11-03 19:15:45 +01:00
speedstep-centrino.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
speedstep-ich.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
speedstep-lib.c cpufreq: speedstep: remove unneeded semicolon 2020-10-28 18:04:07 +01:00
speedstep-lib.h
speedstep-smi.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
sti-cpufreq.c cpufreq: Add __init annotation to module init funcs 2022-09-26 11:15:04 +05:30
sun50i-cpufreq-nvmem.c cpufreq: sun50i: Switch to use dev_err_probe() helper 2022-10-18 16:22:26 +05:30
tegra20-cpufreq.c OPP: Migrate set-supported-hw API to use set-config helpers 2022-07-08 11:27:48 +05:30
tegra124-cpufreq.c
tegra186-cpufreq.c cpufreq: tegra186: Use flexible array to simplify memory allocation 2022-12-01 14:49:50 +05:30
tegra194-cpufreq.c cpufreq: tegra194: Enable CPUFREQ thermal cooling 2023-02-06 09:31:38 +05:30
ti-cpufreq.c cpufreq: ti-cpufreq: Add support for AM625 2022-11-07 15:30:11 +05:30
vexpress-spc-cpufreq.c cpufreq: vexpress: Drop unused variable 2021-10-04 11:25:21 +05:30