[PATCH v1 01/13] arm64: mm: Re-implement the __tlbi_level macro as a C function

Ryan Roberts
2025-12-16T14:46:13Z

As part of efforts to reduce our reliance on complex preprocessor macros
for TLB invalidation routines, convert the __tlbi_level macro to a C
function for by-level TLB invalidation.

Each specific tlbi level op is implemented as a C function and the
appropriate function pointer is passed to __tlbi_level(). Since
everything is declared inline and is statically resolvable, the compiler
will convert the indirect function call to a direct inline execution.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
arch/arm64/include/asm/tlbflush.h | 69 +++++++++++++++++++++++++------
1 file changed, 56 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index a2d65d7d6aae..13a59cf28943 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -105,19 +105,62 @@ static inline unsigned long get_trans_granule(void)

#define TLBI_TTL_UNKNOWN INT_MAX

-#define __tlbi_level(op, addr, level) do { \
- u64 arg = addr; \
- \
- if (alternative_has_cap_unlikely(ARM64_HAS_ARMv8_4_TTL) && \
- level >= 0 && level <= 3) { \
- u64 ttl = level & 3; \
- ttl |= get_trans_granule() << 2; \
- arg &= ~TLBI_TTL_MASK; \
- arg |= FIELD_PREP(TLBI_TTL_MASK, ttl); \
- } \
- \
- __tlbi(op, arg); \
-} while(0)
+typedef void (*tlbi_op)(u64 arg);
+
+static __always_inline void vae1is(u64 arg)
+{
+ __tlbi(vae1is, arg);
+}
+
+static __always_inline void vae2is(u64 arg)
+{
+ __tlbi(vae2is, arg);
+}
+
+static __always_inline void vale1(u64 arg)
+{
+ __tlbi(vale1, arg);
+ __tlbi_user(vale1, arg);
+}
+
+static __always_inline void vale1is(u64 arg)
+{
+ __tlbi(vale1is, arg);
+}
+
+static __always_inline void vale2is(u64 arg)
+{
+ __tlbi(vale2is, arg);
+}
+
+static __always_inline void vaale1is(u64 arg)
+{
+ __tlbi(vaale1is, arg);
+}
+
+static __always_inline void ipas2e1(u64 arg)
+{
+ __tlbi(ipas2e1, arg);
+}
+
+static __always_inline void ipas2e1is(u64 arg)
+{
+ __tlbi(ipas2e1is, arg);
+}
+
+static __always_inline void __tlbi_level(tlbi_op op, u64 addr, u32 level)
+{
+ u64 arg = addr;
+
+ if (alternative_has_cap_unlikely(ARM64_HAS_ARMv8_4_TTL) && level <= 3) {
+ u64 ttl = level | (get_trans_granule() << 2);
+
+ arg &= ~TLBI_TTL_MASK;
+ arg |= FIELD_PREP(TLBI_TTL_MASK, ttl);
+ }
+
+ op(arg);
+}

#define __tlbi_user_level(op, arg, level) do { \
if (arm64_kernel_unmapped_at_el0()) \
--
2.43.0