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UPSTREAM: arm64: cpufeature: Expose get_arm64_ftr_reg() outside cpufeature.c

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get_arm64_ftr_reg() returns the properties of a system register based
on its instruction encoding.

This is needed by erratum workaround in cpu_errata.c to modify the
user-space visible view of id registers.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220909165938.3931307-3-james.morse@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Bug: 261510586
Change-Id: I637553fab833abfc349b391450c9f6a1173501a8
(cherry picked from commit 445c953e4a)
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
James Morse
2022-09-09 17:59:37 +01:00
committed by Suren Baghdasaryan
parent 16017f16ec
commit 9563f49379
2 changed files with 3 additions and 1 deletions
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2
arch/arm64/include/asm/cpufeature.h
View File

@@ -905,6 +905,8 @@ static inline unsigned int get_vmid_bits(u64 mmfr1)
return 8;
}
struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id);
extern struct arm64_ftr_override id_aa64mmfr1_override;
extern struct arm64_ftr_override id_aa64pfr1_override;
extern struct arm64_ftr_override id_aa64isar1_override;

2
arch/arm64/kernel/cpufeature.c
View File

@@ -743,7 +743,7 @@ static struct arm64_ftr_reg *get_arm64_ftr_reg_nowarn(u32 sys_id)
* returns - Upon success, matching ftr_reg entry for id.
* - NULL on failure but with an WARN_ON().
*/
static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id)
struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id)
{
struct arm64_ftr_reg *reg;