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Commit 4a120276 authored by Alastair D'Silva's avatar Alastair D'Silva Committed by Michael Ellerman
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powerpc: Add module autoloading based on CPU features 



This patch provides the necessary infrastructure to allow drivers
to be automatically loaded via udev. It implements the minimum
required to be able to use module_cpu_feature_match() to trigger
the GENERIC_CPU_AUTOPROBE mechanisms.

The features exposed are a mirror of the cpu_user_features
(converted to an offset from a mask). This decision was made to
ensure that the behavior between features for module loading and
userspace are consistent.

Signed-off-by: default avatarAlastair D'Silva <alastair@d-silva.org>
[mpe: Only define the bits we currently need]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 802a3451

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -165,6 +165,7 @@ config PPC 
	select ARCH_HAS_UBSAN_SANITIZE_ALL

	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT

	select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS

	select GENERIC_CPU_AUTOPROBE



config GENERIC_CSUM

	def_bool CPU_LITTLE_ENDIAN

arch/powerpc/include/asm/cpufeature.h

0 → 100644
+40 −0
Original line number Diff line number Diff line 
/*

 * CPU feature definitions for module loading, used by

 * module_cpu_feature_match(), see asm/cputable.h for powerpc CPU features.

 *

 * Copyright 2016 Alastair D'Silva, IBM Corporation.

 *

 * 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_POWERPC_CPUFEATURE_H

#define __ASM_POWERPC_CPUFEATURE_H



#include <asm/cputable.h>



/* Keep these in step with powerpc/include/asm/cputable.h */

#define MAX_CPU_FEATURES (2 * 32)



/*

 * Currently we don't have a need for any of the feature bits defined in

 * cpu_user_features. When we do, they should be defined such as:

 *

 * #define PPC_MODULE_FEATURE_32 (ilog2(PPC_FEATURE_32))

 */



#define PPC_MODULE_FEATURE_VEC_CRYPTO			(32 + ilog2(PPC_FEATURE2_VEC_CRYPTO))



#define cpu_feature(x)		(x)



static inline bool cpu_have_feature(unsigned int num)

{

	if (num < 32)

		return !!(cur_cpu_spec->cpu_user_features & 1UL << num);

	else

		return !!(cur_cpu_spec->cpu_user_features2 & 1UL << (num - 32));

}



#endif /* __ASM_POWERPC_CPUFEATURE_H */