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f9cb654cb5
Most architectures define pgd_free() as a wrapper for free_page(). Provide a generic version in asm-generic/pgalloc.h and enable its use for most architectures. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Pekka Enberg <penberg@kernel.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Joerg Roedel <joro@8bytes.org> Cc: Joerg Roedel <jroedel@suse.de> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com> Cc: Stafford Horne <shorne@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Matthew Wilcox <willy@infradead.org> Link: http://lkml.kernel.org/r/20200627143453.31835-7-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
96 lines
2.6 KiB
C
96 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_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
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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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do { \
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pgtable_pte_page_dtor((pte)); \
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tlb_remove_page((tlb), (pte)); \
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} while (0)
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#endif
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