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kernel: add platform_has() infrastructure

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

Flags can be either global or architecture specific.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross
2022-06-02 15:05:26 +02:00
parent f2906aa863
commit 2130a790ca
6 changed files with 60 additions and 1 deletions
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27
kernel/platform-feature.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <linux/cache.h>
#include <linux/export.h>
#include <linux/platform-feature.h>
#define PLATFORM_FEAT_ARRAY_SZ BITS_TO_LONGS(PLATFORM_FEAT_N)
static unsigned long __read_mostly platform_features[PLATFORM_FEAT_ARRAY_SZ];
void platform_set(unsigned int feature)
{
set_bit(feature, platform_features);
}
EXPORT_SYMBOL_GPL(platform_set);
void platform_clear(unsigned int feature)
{
clear_bit(feature, platform_features);
}
EXPORT_SYMBOL_GPL(platform_clear);
bool platform_has(unsigned int feature)
{
return test_bit(feature, platform_features);
}
EXPORT_SYMBOL_GPL(platform_has);