mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 13:52:50 +01:00
Qi Zheng
e3ecf7c7d0
Now, the nine architectures of csky, hexagon, loongarch, m68k, mips,
nios2, openrisc, sh and um do not select CONFIG_MMU_GATHER_RCU_TABLE_FREE,
and just call pagetable_dtor() + tlb_remove_page_ptdesc() (the wrapper of
tlb_remove_page()). This is the same as the implementation of
tlb_remove_{ptdesc|table}() under !CONFIG_MMU_GATHER_TABLE_FREE, so
convert these architectures to use tlb_remove_ptdesc().
The ultimate goal is to make the architecture only use tlb_remove_ptdesc()
or tlb_remove_table() for page table pages.
[[email protected]: v2]
Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: remove trailing semi in arch/loongarch/include/asm/pgalloc.h]
Link: https://lkml.kernel.org/r/19db3e8673b67bad2f1df1ab37f1c89d99eacfea.1740454179.git.zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <[email protected]>
Suggested-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Kevin Brodsky <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]> [m68k]
Cc: Alexandre Ghiti <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Hugh Dickens <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Matthew Wilcow (Oracle) <[email protected]>
Cc: "Mike Rapoport (IBM)" <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Vishal Moola (Oracle) <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yu Zhao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Page table support for the Hexagon architecture
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*/
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#ifndef _ASM_PGALLOC_H
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#define _ASM_PGALLOC_H
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#include <asm/mem-layout.h>
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#include <asm/atomic.h>
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#include <asm-generic/pgalloc.h>
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extern unsigned long long kmap_generation;
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/*
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* Page table creation interface
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*/
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd;
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pgd = __pgd_alloc(mm, 0);
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/*
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* There may be better ways to do this, but to ensure
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* that new address spaces always contain the kernel
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* base mapping, and to ensure that the user area is
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* initially marked invalid, initialize the new map
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* map with a copy of the kernel's persistent map.
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*/
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memcpy(pgd, swapper_pg_dir, PTRS_PER_PGD*sizeof(pgd_t));
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mm->context.generation = kmap_generation;
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/* Physical version is what is passed to virtual machine on switch */
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mm->context.ptbase = __pa(pgd);
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return pgd;
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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pgtable_t pte)
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{
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/*
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* Conveniently, zero in 3 LSB means indirect 4K page table.
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* Not so convenient when you're trying to vary the page size.
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*/
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set_pmd(pmd, __pmd(((unsigned long)page_to_pfn(pte) << PAGE_SHIFT) |
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HEXAGON_L1_PTE_SIZE));
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}
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/*
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* Other architectures seem to have ways of making all processes
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* share the same pmd's for their kernel mappings, but the v0.3
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* Hexagon VM spec has a "monolithic" L1 table for user and kernel
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* segments. We track "generations" of the kernel map to minimize
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* overhead, and update the "slave" copies of the kernel mappings
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* as part of switch_mm. However, we still need to update the
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* kernel map of the active thread who's calling pmd_populate_kernel...
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*/
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
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pte_t *pte)
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{
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extern spinlock_t kmap_gen_lock;
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pmd_t *ppmd;
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int pmdindex;
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spin_lock(&kmap_gen_lock);
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kmap_generation++;
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mm->context.generation = kmap_generation;
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current->active_mm->context.generation = kmap_generation;
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spin_unlock(&kmap_gen_lock);
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set_pmd(pmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE));
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/*
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* Now the "slave" copy of the current thread.
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* This is pointer arithmetic, not byte addresses!
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*/
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pmdindex = (pgd_t *)pmd - mm->pgd;
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ppmd = (pmd_t *)current->active_mm->pgd + pmdindex;
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set_pmd(ppmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE));
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if (pmdindex > max_kernel_seg)
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max_kernel_seg = pmdindex;
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}
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#define __pte_free_tlb(tlb, pte, addr) \
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tlb_remove_ptdesc((tlb), page_ptdesc(pte))
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#endif
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