Commit 2130a790 authored by Juergen Gross's avatar Juergen Gross
Browse files

kernel: add platform_has() infrastructure 



Add a simple infrastructure for setting, resetting and querying
platform feature flags.

Flags can be either global or architecture specific.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent f2906aa8

MAINTAINERS

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@@ -15824,6 +15824,14 @@ S: Maintained 
F:	Documentation/devicetree/bindings/iio/chemical/plantower,pms7003.yaml

F:	drivers/iio/chemical/pms7003.c









PLATFORM FEATURE INFRASTRUCTURE









M:	Juergen Gross <jgross@suse.com>









S:	Maintained









F:	arch/*/include/asm/platform-feature.h









F:	include/asm-generic/platform-feature.h









F:	include/linux/platform-feature.h









F:	kernel/platform-feature.c

















PLDMFW LIBRARY









M:	Jacob Keller <jacob.e.keller@intel.com>









S:	Maintained
































include/asm-generic/Kbuild



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@@ -44,6 +44,7 @@ mandatory-y += msi.h







mandatory-y += pci.h









mandatory-y += percpu.h









mandatory-y += pgalloc.h









mandatory-y += platform-feature.h









mandatory-y += preempt.h









mandatory-y += rwonce.h









mandatory-y += sections.h
































include/asm-generic/platform-feature.h
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/* SPDX-License-Identifier: GPL-2.0 */









#ifndef _ASM_GENERIC_PLATFORM_FEATURE_H









#define _ASM_GENERIC_PLATFORM_FEATURE_H



















/* Number of arch specific feature flags. */









#define PLATFORM_ARCH_FEAT_N	0



















#endif /* _ASM_GENERIC_PLATFORM_FEATURE_H */
























include/linux/platform-feature.h
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/* SPDX-License-Identifier: GPL-2.0 */









#ifndef _PLATFORM_FEATURE_H









#define _PLATFORM_FEATURE_H



















#include <linux/bitops.h>









#include <asm/platform-feature.h>



















/* The platform features are starting with the architecture specific ones. */









#define PLATFORM_FEAT_N				(0 + PLATFORM_ARCH_FEAT_N)



















void platform_set(unsigned int feature);









void platform_clear(unsigned int feature);









bool platform_has(unsigned int feature);



















#endif /* _PLATFORM_FEATURE_H */
























kernel/Makefile



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@@ -7,7 +7,7 @@ obj-y     = fork.o exec_domain.o panic.o \







	    cpu.o exit.o softirq.o resource.o \









	    sysctl.o capability.o ptrace.o user.o \









	    signal.o sys.o umh.o workqueue.o pid.o task_work.o \









	    extable.o params.o \









	    extable.o params.o platform-feature.o \









	    kthread.o sys_ni.o nsproxy.o \









	    notifier.o ksysfs.o cred.o reboot.o \









	    async.o range.o smpboot.o ucount.o regset.o