Commit e116a375 authored by Andre Przywara's avatar Andre Przywara Committed by Will Deacon
Browse files

arm64: detect silicon revisions and set cap bits accordingly 



After each CPU has been started, we iterate through a list of
CPU features or bugs to detect CPUs which need (or could benefit
from) kernel code patches.
For each feature/bug there is a function which checks if that
particular CPU is affected. We will later provide some more generic
functions for common things like testing for certain MIDR ranges.
We do this for every CPU to cover big.LITTLE systems properly as
well.
If a certain feature/bug has been detected, the capability bit will
be set, so that later the call to apply_alternatives() will trigger
the actual code patching.

Signed-off-by: default avatarAndre Przywara <andre.przywara@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent e039ee4e

arch/arm64/include/asm/cpufeature.h

+2 −0
Original line number Diff line number Diff line
@@ -46,4 +46,6 @@ static inline void cpus_set_cap(unsigned int num) 
		__set_bit(num, cpu_hwcaps);

}



void check_local_cpu_errata(void);



#endif

arch/arm64/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -16,7 +16,7 @@ arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \ 
			   entry-fpsimd.o process.o ptrace.o setup.o signal.o	\

			   sys.o stacktrace.o time.o traps.o io.o vdso.o	\

			   hyp-stub.o psci.o cpu_ops.o insn.o return_address.o	\

			   cpuinfo.o alternative.o

			   cpuinfo.o cpu_errata.o alternative.o



arm64-obj-$(CONFIG_COMPAT)		+= sys32.o kuser32.o signal32.o 	\

					   sys_compat.o 			\

arch/arm64/kernel/cpu_errata.c

0 → 100644
+59 −0
Original line number Diff line number Diff line 
/*

 * Contains CPU specific errata definitions

 *

 * Copyright (C) 2014 ARM Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#define pr_fmt(fmt) "alternative: " fmt



#include <linux/types.h>

#include <asm/cpu.h>

#include <asm/cputype.h>

#include <asm/cpufeature.h>



/*

 * Add a struct or another datatype to the union below if you need

 * different means to detect an affected CPU.

 */

struct arm64_cpu_capabilities {

	const char *desc;

	u16 capability;

	bool (*is_affected)(struct arm64_cpu_capabilities *);

	union {

		struct {

			u32 midr_model;

			u32 midr_range_min, midr_range_max;

		};

	};

};



struct arm64_cpu_capabilities arm64_errata[] = {

	{}

};



void check_local_cpu_errata(void)

{

	struct arm64_cpu_capabilities *cpus = arm64_errata;

	int i;



	for (i = 0; cpus[i].desc; i++) {

		if (!cpus[i].is_affected(&cpus[i]))

			continue;



		if (!cpus_have_cap(cpus[i].capability))

			pr_info("enabling workaround for %s\n", cpus[i].desc);

		cpus_set_cap(cpus[i].capability);

	}

}

arch/arm64/kernel/cpuinfo.c

+3 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <asm/cachetype.h>

#include <asm/cpu.h>

#include <asm/cputype.h>

#include <asm/cpufeature.h>



#include <linux/bitops.h>

#include <linux/bug.h>
@@ -186,6 +187,8 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) 
	info->reg_id_pfr1 = read_cpuid(ID_PFR1_EL1);



	cpuinfo_detect_icache_policy(info);



	check_local_cpu_errata();

}



void cpuinfo_store_cpu(void)

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