[PATCH v3 1/6] powerpc/mm: update ptep_set_access_flag to not do full mm tlb flush
Aneesh Kumar K.V
aneesh.kumar at linux.vnet.ibm.com
Tue Nov 22 05:33:17 AEDT 2016
When we are updating pte, we just need to flush the tlb mapping for
that pte. Right now we do a full mm flush because we don't track page
size. Update the interface to track the page size and use that to
do the right tlb flush.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
---
arch/powerpc/include/asm/book3s/32/pgtable.h | 4 +++-
arch/powerpc/include/asm/book3s/64/pgtable.h | 7 +++++--
arch/powerpc/include/asm/book3s/64/radix.h | 14 +++++++-------
arch/powerpc/include/asm/nohash/32/pgtable.h | 4 +++-
arch/powerpc/include/asm/nohash/64/pgtable.h | 4 +++-
arch/powerpc/mm/pgtable-book3s64.c | 3 ++-
arch/powerpc/mm/pgtable-radix.c | 16 ++++++++++++++++
arch/powerpc/mm/pgtable.c | 10 ++++++++--
arch/powerpc/mm/tlb-radix.c | 15 ---------------
9 files changed, 47 insertions(+), 30 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index 6b8b2d57fdc8..0713626e9189 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -224,7 +224,9 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
static inline void __ptep_set_access_flags(struct mm_struct *mm,
- pte_t *ptep, pte_t entry)
+ pte_t *ptep, pte_t entry,
+ unsigned long address,
+ unsigned long pg_sz)
{
unsigned long set = pte_val(entry) &
(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 86870c11917b..46d739457d68 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -580,10 +580,13 @@ static inline bool check_pte_access(unsigned long access, unsigned long ptev)
*/
static inline void __ptep_set_access_flags(struct mm_struct *mm,
- pte_t *ptep, pte_t entry)
+ pte_t *ptep, pte_t entry,
+ unsigned long address,
+ unsigned long pg_sz)
{
if (radix_enabled())
- return radix__ptep_set_access_flags(mm, ptep, entry);
+ return radix__ptep_set_access_flags(mm, ptep, entry,
+ address, pg_sz);
return hash__ptep_set_access_flags(ptep, entry);
}
diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index 2a46dea8e1b1..279b2f68e00f 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -110,6 +110,7 @@
#define RADIX_PUD_TABLE_SIZE (sizeof(pud_t) << RADIX_PUD_INDEX_SIZE)
#define RADIX_PGD_TABLE_SIZE (sizeof(pgd_t) << RADIX_PGD_INDEX_SIZE)
+extern int radix_get_mmu_psize(unsigned long pg_sz);
static inline unsigned long __radix_pte_update(pte_t *ptep, unsigned long clr,
unsigned long set)
{
@@ -167,7 +168,9 @@ static inline unsigned long radix__pte_update(struct mm_struct *mm,
* function doesn't need to invalidate tlb.
*/
static inline void radix__ptep_set_access_flags(struct mm_struct *mm,
- pte_t *ptep, pte_t entry)
+ pte_t *ptep, pte_t entry,
+ unsigned long address,
+ unsigned long pg_sz)
{
unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED |
@@ -175,6 +178,7 @@ static inline void radix__ptep_set_access_flags(struct mm_struct *mm,
if (cpu_has_feature(CPU_FTR_POWER9_DD1)) {
+ int psize;
unsigned long old_pte, new_pte;
old_pte = __radix_pte_update(ptep, ~0, 0);
@@ -183,12 +187,8 @@ static inline void radix__ptep_set_access_flags(struct mm_struct *mm,
* new value of pte
*/
new_pte = old_pte | set;
-
- /*
- * For now let's do heavy pid flush
- * radix__flush_tlb_page_psize(mm, addr, mmu_virtual_psize);
- */
- radix__flush_tlb_mm(mm);
+ psize = radix_get_mmu_psize(pg_sz);
+ radix__flush_tlb_page_psize(mm, address, psize);
__radix_pte_update(ptep, 0, new_pte);
} else
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index c219ef7be53b..24ee66bf7223 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -268,7 +268,9 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
static inline void __ptep_set_access_flags(struct mm_struct *mm,
- pte_t *ptep, pte_t entry)
+ pte_t *ptep, pte_t entry,
+ unsigned long address,
+ unsigned long pg_sz)
{
unsigned long set = pte_val(entry) &
(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 653a1838469d..86d49dc60ec6 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -301,7 +301,9 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
* function doesn't need to flush the hash entry
*/
static inline void __ptep_set_access_flags(struct mm_struct *mm,
- pte_t *ptep, pte_t entry)
+ pte_t *ptep, pte_t entry,
+ unsigned long address,
+ unsigned long pg_sz)
{
unsigned long bits = pte_val(entry) &
(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
index f4f437cbabf1..5c7c501b7cae 100644
--- a/arch/powerpc/mm/pgtable-book3s64.c
+++ b/arch/powerpc/mm/pgtable-book3s64.c
@@ -35,7 +35,8 @@ int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
#endif
changed = !pmd_same(*(pmdp), entry);
if (changed) {
- __ptep_set_access_flags(vma->vm_mm, pmdp_ptep(pmdp), pmd_pte(entry));
+ __ptep_set_access_flags(vma->vm_mm, pmdp_ptep(pmdp), pmd_pte(entry),
+ address, HPAGE_PMD_SIZE);
flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}
return changed;
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 688b54517655..416918005395 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -222,6 +222,22 @@ static int __init get_idx_from_shift(unsigned int shift)
return idx;
}
+int radix_get_mmu_psize(unsigned long page_size)
+{
+ int psize;
+
+ if (page_size == (1UL << mmu_psize_defs[mmu_virtual_psize].shift))
+ psize = mmu_virtual_psize;
+ else if (page_size == (1UL << mmu_psize_defs[MMU_PAGE_2M].shift))
+ psize = MMU_PAGE_2M;
+ else if (page_size == (1UL << mmu_psize_defs[MMU_PAGE_1G].shift))
+ psize = MMU_PAGE_1G;
+ else
+ return -1;
+ return psize;
+}
+
+
static int __init radix_dt_scan_page_sizes(unsigned long node,
const char *uname, int depth,
void *data)
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 911fdfb63ec1..a9ec0d8f1bcf 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -219,12 +219,18 @@ int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
pte_t *ptep, pte_t entry, int dirty)
{
int changed;
+ unsigned long pg_sz;
+
entry = set_access_flags_filter(entry, vma, dirty);
changed = !pte_same(*(ptep), entry);
if (changed) {
- if (!is_vm_hugetlb_page(vma))
+ if (!is_vm_hugetlb_page(vma)) {
+ pg_sz = PAGE_SIZE;
assert_pte_locked(vma->vm_mm, address);
- __ptep_set_access_flags(vma->vm_mm, ptep, entry);
+ } else
+ pg_sz = huge_page_size(hstate_vma(vma));
+ __ptep_set_access_flags(vma->vm_mm, ptep, entry,
+ address, pg_sz);
flush_tlb_page(vma, address);
}
return changed;
diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c
index 3493cf4e0452..81a9f6390f64 100644
--- a/arch/powerpc/mm/tlb-radix.c
+++ b/arch/powerpc/mm/tlb-radix.c
@@ -282,21 +282,6 @@ void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
}
EXPORT_SYMBOL(radix__flush_tlb_range);
-static int radix_get_mmu_psize(int page_size)
-{
- int psize;
-
- if (page_size == (1UL << mmu_psize_defs[mmu_virtual_psize].shift))
- psize = mmu_virtual_psize;
- else if (page_size == (1UL << mmu_psize_defs[MMU_PAGE_2M].shift))
- psize = MMU_PAGE_2M;
- else if (page_size == (1UL << mmu_psize_defs[MMU_PAGE_1G].shift))
- psize = MMU_PAGE_1G;
- else
- return -1;
- return psize;
-}
-
void radix__tlb_flush(struct mmu_gather *tlb)
{
int psize = 0;
--
2.10.2
More information about the Linuxppc-dev
mailing list