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MIPS: Enable GENERIC_CPU_AUTOPROBE 

Add missing macros and methods that are required by
CONFIG_GENERIC_CPU_AUTOPROBE: MAX_CPU_FEATURES, cpu_have_feature(),
cpu_feature().

Also set a default elf platform as currently it is not set for most MIPS
platforms resulting in incorrectly specified modalias values in cpu
autoprobe ("cpu:type:(null):feature:...").

Export 'elf_hwcap' symbol so that it can be accessed from modules that
use module_cpu_feature_match()

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15395/

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Marcin Nowakowski 2017-03-07 14:19:56 +01:00 committed by Ralf Baechle
parent 39da7c509a
commit 05510f2b48
3 changed files with 34 additions and 0 deletions
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1
arch/mips/Kconfig
View File

@ -46,6 +46,7 @@ config MIPS
select ARCH_DISCARD_MEMBLOCK
select GENERIC_SMP_IDLE_THREAD
select BUILDTIME_EXTABLE_SORT
select GENERIC_CPU_AUTOPROBE
select GENERIC_CLOCKEVENTS
select GENERIC_SCHED_CLOCK if !CAVIUM_OCTEON_SOC
select GENERIC_CMOS_UPDATE

26
arch/mips/include/asm/cpufeature.h Normal file
View File

@ -0,0 +1,26 @@
/*
* CPU feature definitions for module loading, used by
* module_cpu_feature_match(), see uapi/asm/hwcap.h for MIPS CPU features.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef __ASM_CPUFEATURE_H
#define __ASM_CPUFEATURE_H
#include <uapi/asm/hwcap.h>
#include <asm/elf.h>
#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap))
#define cpu_feature(x) ilog2(HWCAP_ ## x)
static inline bool cpu_have_feature(unsigned int num)
{
return elf_hwcap & (1UL << num);
}
#endif /* __ASM_CPUFEATURE_H */

7
arch/mips/kernel/cpu-probe.c
View File

@ -34,6 +34,7 @@
/* Hardware capabilities */
unsigned int elf_hwcap __read_mostly;
EXPORT_SYMBOL_GPL(elf_hwcap);
/*
* Get the FPU Implementation/Revision.
@ -1946,6 +1947,12 @@ void cpu_probe(void)
struct cpuinfo_mips *c = &current_cpu_data;
unsigned int cpu = smp_processor_id();
/*
* Set a default elf platform, cpu probe may later
* overwrite it with a more precise value
*/
set_elf_platform(cpu, "mips");
c->processor_id = PRID_IMP_UNKNOWN;
c->fpu_id = FPIR_IMP_NONE;
c->cputype = CPU_UNKNOWN;