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Diffstat (limited to 'arch/arm64/include/asm/tlbflush.h')
-rw-r--r--arch/arm64/include/asm/tlbflush.h97
1 files changed, 55 insertions, 42 deletions
diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 95fbc8c05607..aa9efee17277 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -322,21 +322,15 @@ static inline bool arch_tlbbatch_should_defer(struct mm_struct *mm)
return true;
}
-static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *batch,
- struct mm_struct *mm,
- unsigned long uaddr)
-{
- __flush_tlb_page_nosync(mm, uaddr);
-}
-
/*
- * If mprotect/munmap/etc occurs during TLB batched flushing, we need to
- * synchronise all the TLBI issued with a DSB to avoid the race mentioned in
- * flush_tlb_batched_pending().
+ * If mprotect/munmap/etc occurs during TLB batched flushing, we need to ensure
+ * all the previously issued TLBIs targeting mm have completed. But since we
+ * can be executing on a remote CPU, a DSB cannot guarantee this like it can
+ * for arch_tlbbatch_flush(). Our only option is to flush the entire mm.
*/
static inline void arch_flush_tlb_batched_pending(struct mm_struct *mm)
{
- dsb(ish);
+ flush_tlb_mm(mm);
}
/*
@@ -396,33 +390,35 @@ static inline void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
#define __flush_tlb_range_op(op, start, pages, stride, \
asid, tlb_level, tlbi_user, lpa2) \
do { \
+ typeof(start) __flush_start = start; \
+ typeof(pages) __flush_pages = pages; \
int num = 0; \
int scale = 3; \
int shift = lpa2 ? 16 : PAGE_SHIFT; \
unsigned long addr; \
\
- while (pages > 0) { \
+ while (__flush_pages > 0) { \
if (!system_supports_tlb_range() || \
- pages == 1 || \
- (lpa2 && start != ALIGN(start, SZ_64K))) { \
- addr = __TLBI_VADDR(start, asid); \
+ __flush_pages == 1 || \
+ (lpa2 && __flush_start != ALIGN(__flush_start, SZ_64K))) { \
+ addr = __TLBI_VADDR(__flush_start, asid); \
__tlbi_level(op, addr, tlb_level); \
if (tlbi_user) \
__tlbi_user_level(op, addr, tlb_level); \
- start += stride; \
- pages -= stride >> PAGE_SHIFT; \
+ __flush_start += stride; \
+ __flush_pages -= stride >> PAGE_SHIFT; \
continue; \
} \
\
- num = __TLBI_RANGE_NUM(pages, scale); \
+ num = __TLBI_RANGE_NUM(__flush_pages, scale); \
if (num >= 0) { \
- addr = __TLBI_VADDR_RANGE(start >> shift, asid, \
+ addr = __TLBI_VADDR_RANGE(__flush_start >> shift, asid, \
scale, num, tlb_level); \
__tlbi(r##op, addr); \
if (tlbi_user) \
__tlbi_user(r##op, addr); \
- start += __TLBI_RANGE_PAGES(num, scale) << PAGE_SHIFT; \
- pages -= __TLBI_RANGE_PAGES(num, scale); \
+ __flush_start += __TLBI_RANGE_PAGES(num, scale) << PAGE_SHIFT; \
+ __flush_pages -= __TLBI_RANGE_PAGES(num, scale);\
} \
scale--; \
} \
@@ -431,7 +427,24 @@ do { \
#define __flush_s2_tlb_range_op(op, start, pages, stride, tlb_level) \
__flush_tlb_range_op(op, start, pages, stride, 0, tlb_level, false, kvm_lpa2_is_enabled());
-static inline void __flush_tlb_range_nosync(struct vm_area_struct *vma,
+static inline bool __flush_tlb_range_limit_excess(unsigned long start,
+ unsigned long end, unsigned long pages, unsigned long stride)
+{
+ /*
+ * When the system does not support TLB range based flush
+ * operation, (MAX_DVM_OPS - 1) pages can be handled. But
+ * with TLB range based operation, MAX_TLBI_RANGE_PAGES
+ * pages can be handled.
+ */
+ if ((!system_supports_tlb_range() &&
+ (end - start) >= (MAX_DVM_OPS * stride)) ||
+ pages > MAX_TLBI_RANGE_PAGES)
+ return true;
+
+ return false;
+}
+
+static inline void __flush_tlb_range_nosync(struct mm_struct *mm,
unsigned long start, unsigned long end,
unsigned long stride, bool last_level,
int tlb_level)
@@ -442,21 +455,13 @@ static inline void __flush_tlb_range_nosync(struct vm_area_struct *vma,
end = round_up(end, stride);
pages = (end - start) >> PAGE_SHIFT;
- /*
- * When not uses TLB range ops, we can handle up to
- * (MAX_DVM_OPS - 1) pages;
- * When uses TLB range ops, we can handle up to
- * MAX_TLBI_RANGE_PAGES pages.
- */
- if ((!system_supports_tlb_range() &&
- (end - start) >= (MAX_DVM_OPS * stride)) ||
- pages > MAX_TLBI_RANGE_PAGES) {
- flush_tlb_mm(vma->vm_mm);
+ if (__flush_tlb_range_limit_excess(start, end, pages, stride)) {
+ flush_tlb_mm(mm);
return;
}
dsb(ishst);
- asid = ASID(vma->vm_mm);
+ asid = ASID(mm);
if (last_level)
__flush_tlb_range_op(vale1is, start, pages, stride, asid,
@@ -465,7 +470,7 @@ static inline void __flush_tlb_range_nosync(struct vm_area_struct *vma,
__flush_tlb_range_op(vae1is, start, pages, stride, asid,
tlb_level, true, lpa2_is_enabled());
- mmu_notifier_arch_invalidate_secondary_tlbs(vma->vm_mm, start, end);
+ mmu_notifier_arch_invalidate_secondary_tlbs(mm, start, end);
}
static inline void __flush_tlb_range(struct vm_area_struct *vma,
@@ -473,7 +478,7 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma,
unsigned long stride, bool last_level,
int tlb_level)
{
- __flush_tlb_range_nosync(vma, start, end, stride,
+ __flush_tlb_range_nosync(vma->vm_mm, start, end, stride,
last_level, tlb_level);
dsb(ish);
}
@@ -492,19 +497,21 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
- unsigned long addr;
+ const unsigned long stride = PAGE_SIZE;
+ unsigned long pages;
- if ((end - start) > (MAX_DVM_OPS * PAGE_SIZE)) {
+ start = round_down(start, stride);
+ end = round_up(end, stride);
+ pages = (end - start) >> PAGE_SHIFT;
+
+ if (__flush_tlb_range_limit_excess(start, end, pages, stride)) {
flush_tlb_all();
return;
}
- start = __TLBI_VADDR(start, 0);
- end = __TLBI_VADDR(end, 0);
-
dsb(ishst);
- for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
- __tlbi(vaale1is, addr);
+ __flush_tlb_range_op(vaale1is, start, pages, stride, 0,
+ TLBI_TTL_UNKNOWN, false, lpa2_is_enabled());
dsb(ish);
isb();
}
@@ -522,6 +529,12 @@ static inline void __flush_tlb_kernel_pgtable(unsigned long kaddr)
dsb(ish);
isb();
}
+
+static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *batch,
+ struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+ __flush_tlb_range_nosync(mm, start, end, PAGE_SIZE, true, 3);
+}
#endif
#endif
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-26 21:13:31 +0300