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a9b3c355c2
We already have a generic implementation of alloc/free up to P4D level, as
well as pgd_free(). Let's finish the work and add a generic PGD-level
alloc helper as well.
Unlike at lower levels, almost all architectures need some specific magic
at PGD level (typically initialising PGD entries), so introducing a
generic pgd_alloc() isn't worth it. Instead we introduce two new helpers,
__pgd_alloc() and __pgd_free(), and make use of them in the arch-specific
pgd_alloc() and pgd_free() wherever possible. To accommodate as many arch
as possible, __pgd_alloc() takes a page allocation order.
Because pagetable_alloc() allocates zeroed pages, explicit zeroing in
pgd_alloc() becomes redundant and we can get rid of it. Some trivial
implementations of pgd_free() also become unnecessary once __pgd_alloc()
is used; remove them.
Another small improvement is consistent accounting of PGD pages by using
GFP_PGTABLE_{USER,KERNEL} as appropriate.
Not all PGD allocations can be handled by the generic helpers. In
particular, multiple architectures allocate PGDs from a kmem_cache, and
those PGDs may not be page-sized.
Link: https://lkml.kernel.org/r/20250103184415.2744423-6-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
166 lines
3.1 KiB
C
166 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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struct page *dmw_virt_to_page(unsigned long kaddr)
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{
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return phys_to_page(__pa(kaddr));
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}
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EXPORT_SYMBOL(dmw_virt_to_page);
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struct page *tlb_virt_to_page(unsigned long kaddr)
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{
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return phys_to_page(pfn_to_phys(pte_pfn(*virt_to_kpte(kaddr))));
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}
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EXPORT_SYMBOL(tlb_virt_to_page);
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *init, *ret;
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ret = __pgd_alloc(mm, 0);
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if (ret) {
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init = pgd_offset(&init_mm, 0UL);
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pgd_init(ret);
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memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
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(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(pgd_alloc);
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void pgd_init(void *addr)
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{
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unsigned long *p, *end;
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unsigned long entry;
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#if !defined(__PAGETABLE_PUD_FOLDED)
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entry = (unsigned long)invalid_pud_table;
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#elif !defined(__PAGETABLE_PMD_FOLDED)
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entry = (unsigned long)invalid_pmd_table;
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#else
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entry = (unsigned long)invalid_pte_table;
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#endif
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PGD;
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do {
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p[0] = entry;
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p[1] = entry;
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p[2] = entry;
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p[3] = entry;
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p[4] = entry;
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p += 8;
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p[-3] = entry;
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p[-2] = entry;
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p[-1] = entry;
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} while (p != end);
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}
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EXPORT_SYMBOL_GPL(pgd_init);
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#ifndef __PAGETABLE_PMD_FOLDED
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void pmd_init(void *addr)
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{
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unsigned long *p, *end;
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unsigned long pagetable = (unsigned long)invalid_pte_table;
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PMD;
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do {
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p[0] = pagetable;
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p[1] = pagetable;
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p[2] = pagetable;
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p[3] = pagetable;
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p[4] = pagetable;
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p += 8;
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p[-3] = pagetable;
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p[-2] = pagetable;
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p[-1] = pagetable;
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} while (p != end);
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}
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EXPORT_SYMBOL_GPL(pmd_init);
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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void pud_init(void *addr)
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{
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unsigned long *p, *end;
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unsigned long pagetable = (unsigned long)invalid_pmd_table;
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PUD;
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do {
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p[0] = pagetable;
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p[1] = pagetable;
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p[2] = pagetable;
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p[3] = pagetable;
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p[4] = pagetable;
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p += 8;
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p[-3] = pagetable;
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p[-2] = pagetable;
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p[-1] = pagetable;
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} while (p != end);
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}
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EXPORT_SYMBOL_GPL(pud_init);
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#endif
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void kernel_pte_init(void *addr)
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{
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unsigned long *p, *end;
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PTE;
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do {
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p[0] = _PAGE_GLOBAL;
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p[1] = _PAGE_GLOBAL;
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p[2] = _PAGE_GLOBAL;
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p[3] = _PAGE_GLOBAL;
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p[4] = _PAGE_GLOBAL;
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p += 8;
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p[-3] = _PAGE_GLOBAL;
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p[-2] = _PAGE_GLOBAL;
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p[-1] = _PAGE_GLOBAL;
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} while (p != end);
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}
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pmd_t mk_pmd(struct page *page, pgprot_t prot)
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{
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pmd_t pmd;
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pmd_val(pmd) = (page_to_pfn(page) << PFN_PTE_SHIFT) | pgprot_val(prot);
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return pmd;
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}
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void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd)
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{
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WRITE_ONCE(*pmdp, pmd);
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flush_tlb_all();
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}
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void __init pagetable_init(void)
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{
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/* Initialize the entire pgd. */
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pgd_init(swapper_pg_dir);
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pgd_init(invalid_pg_dir);
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#ifndef __PAGETABLE_PUD_FOLDED
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pud_init(invalid_pud_table);
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd_init(invalid_pmd_table);
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#endif
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}
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