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powerpc/pseries: Implement arch_get_random_long() based on H_RANDOM
Add support for the arch_get_random_long() hook based on the H_RANDOM hypervisor call. We trust the hypervisor to provide us with random data, ie. we don't whiten it in anyway. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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66548e4058
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2 changed files with 45 additions and 1 deletions
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@ -3,7 +3,7 @@ ccflags-$(CONFIG_PPC_PSERIES_DEBUG) += -DDEBUG
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obj-y := lpar.o hvCall.o nvram.o reconfig.o \
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setup.o iommu.o event_sources.o ras.o \
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firmware.o power.o dlpar.o mobility.o
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firmware.o power.o dlpar.o mobility.o rng.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SCANLOG) += scanlog.o
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obj-$(CONFIG_EEH) += eeh_pseries.o
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44
arch/powerpc/platforms/pseries/rng.c
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44
arch/powerpc/platforms/pseries/rng.c
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@ -0,0 +1,44 @@
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/*
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* Copyright 2013, Michael Ellerman, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "pseries-rng: " fmt
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <asm/archrandom.h>
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#include <asm/machdep.h>
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static int pseries_get_random_long(unsigned long *v)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
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*v = retbuf[0];
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return 1;
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}
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return 0;
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}
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static __init int rng_init(void)
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{
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struct device_node *dn;
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dn = of_find_compatible_node(NULL, NULL, "ibm,random");
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if (!dn)
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return -ENODEV;
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pr_info("Registering arch random hook.\n");
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ppc_md.get_random_long = pseries_get_random_long;
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return 0;
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}
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subsys_initcall(rng_init);
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