[PATCH v10 2/4] mm/tlbbatch: Rename and extend some functions

Yicong Yang
2023-07-10T08:43:24Z

From: Barry Song <v-songbaohua@oppo.com>

This patch does some preparation works to extend batched TLB flush to
arm64. Including:
- Extend set_tlb_ubc_flush_pending() and arch_tlbbatch_add_mm()
to accept an additional argument for address, architectures
like arm64 may need this for tlbi.
- Rename arch_tlbbatch_add_mm() to arch_tlbbatch_add_pending()
to match its current function since we don't need to handle
mm on architectures like arm64 and add_mm is not proper,
add_pending will make sense to both as on x86 we're pending the
TLB flush operations while on arm64 we're pending the synchronize
operations.

This intends no functional changes on x86.

Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Nadav Amit <namit@vmware.com>
Cc: Mel Gorman <mgorman@suse.de>
Tested-by: Yicong Yang <yangyicong@hisilicon.com>
Tested-by: Xin Hao <xhao@linux.alibaba.com>
Tested-by: Punit Agrawal <punit.agrawal@bytedance.com>
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/x86/include/asm/tlbflush.h | 5 +++--
include/linux/mm_types_task.h | 4 ++--
mm/rmap.c | 12 +++++++-----
3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index cf2a1de5d388..1c7d3a36e16c 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -276,8 +276,9 @@ static inline u64 inc_mm_tlb_gen(struct mm_struct *mm)
return atomic64_inc_return(&mm->context.tlb_gen);
}

-static inline void arch_tlbbatch_add_mm(struct arch_tlbflush_unmap_batch *batch,
- struct mm_struct *mm)
+static inline void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *batch,
+ struct mm_struct *mm,
+ unsigned long uaddr)
{
inc_mm_tlb_gen(mm);
cpumask_or(&batch->cpumask, &batch->cpumask, mm_cpumask(mm));
diff --git a/include/linux/mm_types_task.h b/include/linux/mm_types_task.h
index 5414b5c6a103..aa44fff8bb9d 100644
--- a/include/linux/mm_types_task.h
+++ b/include/linux/mm_types_task.h
@@ -52,8 +52,8 @@ struct tlbflush_unmap_batch {
#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
/*
* The arch code makes the following promise: generic code can modify a
- * PTE, then call arch_tlbbatch_add_mm() (which internally provides all
- * needed barriers), then call arch_tlbbatch_flush(), and the entries
+ * PTE, then call arch_tlbbatch_add_pending() (which internally provides
+ * all needed barriers), then call arch_tlbbatch_flush(), and the entries
* will be flushed on all CPUs by the time that arch_tlbbatch_flush()
* returns.
*/
diff --git a/mm/rmap.c b/mm/rmap.c
index 6480e526c154..9699c6011b0e 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -642,7 +642,8 @@ void try_to_unmap_flush_dirty(void)
#define TLB_FLUSH_BATCH_PENDING_LARGE \
(TLB_FLUSH_BATCH_PENDING_MASK / 2)

-static void set_tlb_ubc_flush_pending(struct mm_struct *mm, pte_t pteval)
+static void set_tlb_ubc_flush_pending(struct mm_struct *mm, pte_t pteval,
+ unsigned long uaddr)
{
struct tlbflush_unmap_batch *tlb_ubc = &current->tlb_ubc;
int batch;
@@ -651,7 +652,7 @@ static void set_tlb_ubc_flush_pending(struct mm_struct *mm, pte_t pteval)
if (!pte_accessible(mm, pteval))
return;

- arch_tlbbatch_add_mm(&tlb_ubc->arch, mm);
+ arch_tlbbatch_add_pending(&tlb_ubc->arch, mm, uaddr);
tlb_ubc->flush_required = true;

/*
@@ -726,7 +727,8 @@ void flush_tlb_batched_pending(struct mm_struct *mm)
}
}
#else
-static void set_tlb_ubc_flush_pending(struct mm_struct *mm, pte_t pteval)
+static void set_tlb_ubc_flush_pending(struct mm_struct *mm, pte_t pteval,
+ unsigned long uaddr)
{
}

@@ -1579,7 +1581,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
*/
pteval = ptep_get_and_clear(mm, address, pvmw.pte);

- set_tlb_ubc_flush_pending(mm, pteval);
+ set_tlb_ubc_flush_pending(mm, pteval, address);
} else {
pteval = ptep_clear_flush(vma, address, pvmw.pte);
}
@@ -1962,7 +1964,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
*/
pteval = ptep_get_and_clear(mm, address, pvmw.pte);

- set_tlb_ubc_flush_pending(mm, pteval);
+ set_tlb_ubc_flush_pending(mm, pteval, address);
} else {
pteval = ptep_clear_flush(vma, address, pvmw.pte);
}
--
2.24.0