Release 4.14 arch/s390/include/asm/tlb.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _S390_TLB_H
#define _S390_TLB_H
/*
* TLB flushing on s390 is complicated. The following requirement
* from the principles of operation is the most arduous:
*
* "A valid table entry must not be changed while it is attached
* to any CPU and may be used for translation by that CPU except to
* (1) invalidate the entry by using INVALIDATE PAGE TABLE ENTRY,
* or INVALIDATE DAT TABLE ENTRY, (2) alter bits 56-63 of a page
* table entry, or (3) make a change by means of a COMPARE AND SWAP
* AND PURGE instruction that purges the TLB."
*
* The modification of a pte of an active mm struct therefore is
* a two step process: i) invalidate the pte, ii) store the new pte.
* This is true for the page protection bit as well.
* The only possible optimization is to flush at the beginning of
* a tlb_gather_mmu cycle if the mm_struct is currently not in use.
*
* Pages used for the page tables is a different story. FIXME: more
*/
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <asm/processor.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
struct mmu_gather {
struct mm_struct *mm;
struct mmu_table_batch *batch;
unsigned int fullmm;
unsigned long start, end;
};
struct mmu_table_batch {
struct rcu_head rcu;
unsigned int nr;
void *tables[0];
};
#define MAX_TABLE_BATCH \
((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))
extern void tlb_table_flush(struct mmu_gather *tlb);
extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
static inline void
arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
unsigned long start, unsigned long end)
{
tlb->mm = mm;
tlb->start = start;
tlb->end = end;
tlb->fullmm = !(start | (end+1));
tlb->batch = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 31 | 48.44% | 2 | 40.00% |
| Linus Torvalds | 28 | 43.75% | 1 | 20.00% |
| Peter Zijlstra | 4 | 6.25% | 1 | 20.00% |
| MinChan Kim | 1 | 1.56% | 1 | 20.00% |
| Total | 64 | 100.00% | 5 | 100.00% |
static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
{
__tlb_flush_mm_lazy(tlb->mm);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 17 | 89.47% | 2 | 66.67% |
| Linus Torvalds | 2 | 10.53% | 1 | 33.33% |
| Total | 19 | 100.00% | 3 | 100.00% |
static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
{
tlb_table_flush(tlb);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 11 | 64.71% | 1 | 25.00% |
| Martin Schwidefsky | 5 | 29.41% | 2 | 50.00% |
| Benjamin Herrenschmidt | 1 | 5.88% | 1 | 25.00% |
| Total | 17 | 100.00% | 4 | 100.00% |
static inline void tlb_flush_mmu(struct mmu_gather *tlb)
{
tlb_flush_mmu_tlbonly(tlb);
tlb_flush_mmu_free(tlb);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
static inline void
arch_tlb_finish_mmu(struct mmu_gather *tlb,
unsigned long start, unsigned long end, bool force)
{
if (force) {
tlb->start = start;
tlb->end = end;
}
tlb_flush_mmu(tlb);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 24 | 52.17% | 2 | 50.00% |
| MinChan Kim | 22 | 47.83% | 2 | 50.00% |
| Total | 46 | 100.00% | 4 | 100.00% |
/*
* Release the page cache reference for a pte removed by
* tlb_ptep_clear_flush. In both flush modes the tlb for a page cache page
* has already been freed, so just do free_page_and_swap_cache.
*/
static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
free_page_and_swap_cache(page);
return false; /* avoid calling tlb_flush_mmu */
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 24 | 92.31% | 1 | 50.00% |
| Aneesh Kumar K.V | 2 | 7.69% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
free_page_and_swap_cache(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
struct page *page, int page_size)
{
return __tlb_remove_page(tlb, page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aneesh Kumar K.V | 28 | 100.00% | 2 | 100.00% |
| Total | 28 | 100.00% | 2 | 100.00% |
static inline void tlb_remove_page_size(struct mmu_gather *tlb,
struct page *page, int page_size)
{
return tlb_remove_page(tlb, page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aneesh Kumar K.V | 28 | 100.00% | 1 | 100.00% |
| Total | 28 | 100.00% | 1 | 100.00% |
/*
* pte_free_tlb frees a pte table and clears the CRSTE for the
* page table from the tlb.
*/
static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
unsigned long address)
{
page_table_free_rcu(tlb, (unsigned long *) pte, address);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 29 | 87.88% | 5 | 83.33% |
| Benjamin Herrenschmidt | 4 | 12.12% | 1 | 16.67% |
| Total | 33 | 100.00% | 6 | 100.00% |
/*
* pmd_free_tlb frees a pmd table and clears the CRSTE for the
* segment table entry from the tlb.
* If the mm uses a two level page table the single pmd is freed
* as the pgd. pmd_free_tlb checks the asce_limit against 2GB
* to avoid the double free of the pmd in this case.
*/
static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
unsigned long address)
{
if (tlb->mm->context.asce_limit <= _REGION3_SIZE)
return;
pgtable_pmd_page_dtor(virt_to_page(pmd));
tlb_remove_table(tlb, pmd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 43 | 89.58% | 4 | 66.67% |
| Benjamin Herrenschmidt | 4 | 8.33% | 1 | 16.67% |
| Heiko Carstens | 1 | 2.08% | 1 | 16.67% |
| Total | 48 | 100.00% | 6 | 100.00% |
/*
* p4d_free_tlb frees a pud table and clears the CRSTE for the
* region second table entry from the tlb.
* If the mm uses a four level page table the single p4d is freed
* as the pgd. p4d_free_tlb checks the asce_limit against 8PB
* to avoid the double free of the p4d in this case.
*/
static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long address)
{
if (tlb->mm->context.asce_limit <= _REGION1_SIZE)
return;
tlb_remove_table(tlb, p4d);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 39 | 97.50% | 1 | 50.00% |
| Heiko Carstens | 1 | 2.50% | 1 | 50.00% |
| Total | 40 | 100.00% | 2 | 100.00% |
/*
* pud_free_tlb frees a pud table and clears the CRSTE for the
* region third table entry from the tlb.
* If the mm uses a three level page table the single pud is freed
* as the pgd. pud_free_tlb checks the asce_limit against 4TB
* to avoid the double free of the pud in this case.
*/
static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
unsigned long address)
{
if (tlb->mm->context.asce_limit <= _REGION2_SIZE)
return;
tlb_remove_table(tlb, pud);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 35 | 87.50% | 4 | 66.67% |
| Benjamin Herrenschmidt | 4 | 10.00% | 1 | 16.67% |
| Heiko Carstens | 1 | 2.50% | 1 | 16.67% |
| Total | 40 | 100.00% | 6 | 100.00% |
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
#define tlb_remove_tlb_entry(tlb, ptep, addr) do { } while (0)
#define tlb_remove_pmd_tlb_entry(tlb, pmdp, addr) do { } while (0)
#define tlb_migrate_finish(mm) do { } while (0)
#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \
tlb_remove_tlb_entry(tlb, ptep, address)
#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
unsigned int page_size)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aneesh Kumar K.V | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
#endif /* _S390_TLB_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Schwidefsky | 365 | 58.78% | 12 | 42.86% |
| Aneesh Kumar K.V | 91 | 14.65% | 4 | 14.29% |
| Linus Torvalds | 69 | 11.11% | 2 | 7.14% |
| Peter Zijlstra | 41 | 6.60% | 1 | 3.57% |
| MinChan Kim | 23 | 3.70% | 2 | 7.14% |
| Benjamin Herrenschmidt | 13 | 2.09% | 2 | 7.14% |
| Gerald Schaefer | 11 | 1.77% | 1 | 3.57% |
| Heiko Carstens | 6 | 0.97% | 2 | 7.14% |
| Anton Blanchard | 1 | 0.16% | 1 | 3.57% |
| Greg Kroah-Hartman | 1 | 0.16% | 1 | 3.57% |
| Total | 621 | 100.00% | 28 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.