Re: [PATCH v9 05/10] arm64/vmalloc: allow arch_vmap_pte_range_map_size() to batch multiple CONT_PTE

From: "Barry Song (Xiaomi)" <baohua@kernel.org>

Allow arch_vmap_pte_range_map_size to batch across multiple CONT_PTE
blocks, reducing both PTE setup and TLB flush iterations.

For CONT_PTE_SIZE-aligned ranges, return a mapping size that may cover
multiple CONT_PTE blocks, capped below PMD_SIZE. These sizes are vmalloc
mapping spans, not HugeTLB hstate sizes.

Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Signed-off-by: Wen Jiang <redacted>
Tested-by: Xueyuan Chen <redacted>
Tested-by: Leo Yan <leo.yan@arm.com>
---
 arch/arm64/include/asm/vmalloc.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/vmalloc.h b/arch/arm64/include/asm/vmalloc.h
index 4ec1acd3c1b34..4053b1ec1902e 100644
--- a/arch/arm64/include/asm/vmalloc.h
+++ b/arch/arm64/include/asm/vmalloc.h

@@ -23,10 +23,14 @@ static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr,
 						unsigned long end, u64 pfn,
 						unsigned int max_page_shift)
 {
+	unsigned long size;
+
 	/*
 	 * If the block is at least CONT_PTE_SIZE in size, and is naturally
 	 * aligned in both virtual and physical space, then we can pte-map the
 	 * block using the PTE_CONT bit for more efficient use of the TLB.
+	 * The returned mapping size may cover multiple CONT_PTE_SIZE blocks,
+	 * capped below PMD_SIZE.
 	 */
 	if (max_page_shift < CONT_PTE_SHIFT)
 		return PAGE_SIZE;

@@ -40,7 +44,9 @@ static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr,
 	if (!IS_ALIGNED(PFN_PHYS(pfn), CONT_PTE_SIZE))
 		return PAGE_SIZE;
 
-	return CONT_PTE_SIZE;
+	size = min3(end - addr, 1UL << max_page_shift, PMD_SIZE >> 1);