Commit a4da0d50 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
Browse files

powerpc: Implement arch_get_random_long/int() for powernv 



Add the plumbing to implement arch_get_random_long/int(). It didn't seem
worth adding an extra ppc_md hook for int, so we reuse the one for long.

Add an implementation for powernv based on the hwrng found in power7+
systems. We whiten the output of the hwrng, and the result passes all
the dieharder tests.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent f95dabef

arch/powerpc/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -1012,6 +1012,9 @@ config PHYSICAL_START 
	default "0x00000000"

endif



config	ARCH_RANDOM

	def_bool n



source "net/Kconfig"



source "drivers/Kconfig"

arch/powerpc/include/asm/archrandom.h

0 → 100644
+32 −0
Original line number Diff line number Diff line 
#ifndef _ASM_POWERPC_ARCHRANDOM_H

#define _ASM_POWERPC_ARCHRANDOM_H



#ifdef CONFIG_ARCH_RANDOM



#include <asm/machdep.h>



static inline int arch_get_random_long(unsigned long *v)

{

	if (ppc_md.get_random_long)

		return ppc_md.get_random_long(v);



	return 0;

}



static inline int arch_get_random_int(unsigned int *v)

{

	unsigned long val;

	int rc;



	rc = arch_get_random_long(&val);

	if (rc)

		*v = val;



	return rc;

}



int powernv_get_random_long(unsigned long *v);



#endif /* CONFIG_ARCH_RANDOM */



#endif /* _ASM_POWERPC_ARCHRANDOM_H */

arch/powerpc/include/asm/machdep.h

+4 −0
Original line number Diff line number Diff line
@@ -263,6 +263,10 @@ struct machdep_calls { 
	ssize_t (*cpu_probe)(const char *, size_t);

	ssize_t (*cpu_release)(const char *, size_t);

#endif



#ifdef CONFIG_ARCH_RANDOM

	int (*get_random_long)(unsigned long *v);

#endif

};



extern void e500_idle(void);

arch/powerpc/platforms/powernv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ config PPC_POWERNV 
	select EPAPR_BOOT

	select PPC_INDIRECT_PIO

	select PPC_UDBG_16550

	select ARCH_RANDOM

	default y



config POWERNV_MSI

arch/powerpc/platforms/powernv/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-y			+= setup.o opal-takeover.o opal-wrappers.o opal.o

obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o

obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o rng.o



obj-$(CONFIG_SMP)	+= smp.o

obj-$(CONFIG_PCI)	+= pci.o pci-p5ioc2.o pci-ioda.o

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