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arm64: mm: Introduce a C wrapper for by-range TLB invalidation

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As part of efforts to reduce our reliance on complex preprocessor macros
for TLB invalidation routines, introduce a new C wrapper for by-range
TLB invalidation which can be used instead of the __tlbi() macro and can
additionally be called from C code.

Each specific tlbi range op is implemented as a C function and the
appropriate function pointer is passed to __tlbi_range(). 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>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ryan Roberts 2026-03-02 13:55:49 +00:00 committed by Catalin Marinas
parent 5b3fb8a6b4
commit d2bf322695
1 changed files with 31 additions and 1 deletions
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32
arch/arm64/include/asm/tlbflush.h
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@ -468,6 +468,36 @@ static inline void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
* operations can only span an even number of pages. We save this for last to
* ensure 64KB start alignment is maintained for the LPA2 case.
*/
static __always_inline void rvae1is(u64 arg)
{
__tlbi(rvae1is, arg);
}
static __always_inline void rvale1(u64 arg)
{
__tlbi(rvale1, arg);
}
static __always_inline void rvale1is(u64 arg)
{
__tlbi(rvale1is, arg);
}
static __always_inline void rvaale1is(u64 arg)
{
__tlbi(rvaale1is, arg);
}
static __always_inline void ripas2e1is(u64 arg)
{
__tlbi(ripas2e1is, arg);
}
static __always_inline void __tlbi_range(tlbi_op op, u64 arg)
{
op(arg);
}
#define __flush_tlb_range_op(op, start, pages, stride, \
asid, tlb_level, tlbi_user, lpa2) \
do { \
@ -495,7 +525,7 @@ do { \
if (num >= 0) { \
addr = __TLBI_VADDR_RANGE(__flush_start >> shift, asid, \
scale, num, tlb_level); \
__tlbi(r##op, addr); \
__tlbi_range(r##op, addr); \
if (tlbi_user) \
__tlbi_user(r##op, addr); \
__flush_start += __TLBI_RANGE_PAGES(num, scale) << PAGE_SHIFT; \