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| author | Will Deacon <will.deacon@arm.com> | 2017-08-10 13:29:06 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-12-11 13:40:29 +0000 |
| commit | 85d13c001497b481b4a8cc5d7db243cc44ac2bd8 (patch) | |
| tree | aa9f9db5f6d9b6856c8cbb32bd0c13cdd6cd3430 /arch/arm64/mm/context.c | |
| parent | 7655abb953860485940d4de74fb45a8192149bb6 (diff) | |
| download | linux-85d13c001497b481b4a8cc5d7db243cc44ac2bd8.tar.bz2 | |
arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum #E1003
The pre_ttbr0_update_workaround hook is called prior to context-switching
TTBR0 because Falkor erratum E1003 can cause TLB allocation with the wrong
ASID if both the ASID and the base address of the TTBR are updated at
the same time.
With the ASID sitting safely in TTBR1, we no longer update things
atomically, so we can remove the pre_ttbr0_update_workaround macro as
it's no longer required. The erratum infrastructure and documentation
is left around for #E1003, as it will be required by the entry
trampoline code in a future patch.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm/context.c')
| -rw-r--r-- | arch/arm64/mm/context.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c index 6f4017046323..78a2dc596fee 100644 --- a/arch/arm64/mm/context.c +++ b/arch/arm64/mm/context.c @@ -79,13 +79,6 @@ void verify_cpu_asid_bits(void) } } -static void set_reserved_asid_bits(void) -{ - if (IS_ENABLED(CONFIG_QCOM_FALKOR_ERRATUM_1003) && - cpus_have_const_cap(ARM64_WORKAROUND_QCOM_FALKOR_E1003)) - __set_bit(FALKOR_RESERVED_ASID, asid_map); -} - static void flush_context(unsigned int cpu) { int i; @@ -94,8 +87,6 @@ static void flush_context(unsigned int cpu) /* Update the list of reserved ASIDs and the ASID bitmap. */ bitmap_clear(asid_map, 0, NUM_USER_ASIDS); - set_reserved_asid_bits(); - for_each_possible_cpu(i) { asid = atomic64_xchg_relaxed(&per_cpu(active_asids, i), 0); /* @@ -254,8 +245,6 @@ static int asids_init(void) panic("Failed to allocate bitmap for %lu ASIDs\n", NUM_USER_ASIDS); - set_reserved_asid_bits(); - pr_info("ASID allocator initialised with %lu entries\n", NUM_USER_ASIDS); return 0; } |