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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/include/asm-generic/pgalloc.h
....@@ -1,13 +1,187 @@
11 /* SPDX-License-Identifier: GPL-2.0 */
22 #ifndef __ASM_GENERIC_PGALLOC_H
33 #define __ASM_GENERIC_PGALLOC_H
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-/*
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- * an empty file is enough for a nommu architecture
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- */
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+
75 #ifdef CONFIG_MMU
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-#error need to implement an architecture specific asm/pgalloc.h
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+
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+#define GFP_PGTABLE_KERNEL	(GFP_KERNEL | __GFP_ZERO)
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+#define GFP_PGTABLE_USER	(GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
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+
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+/**
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+ * __pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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+ * @mm: the mm_struct of the current context
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+ *
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+ * This function is intended for architectures that need
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+ * anything beyond simple page allocation.
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+ *
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+ * Return: pointer to the allocated memory or %NULL on error
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+ */
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+static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
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+{
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+	return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
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+}
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+
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+#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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+/**
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+ * pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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+ * @mm: the mm_struct of the current context
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+ *
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+ * Return: pointer to the allocated memory or %NULL on error
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+ */
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+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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+{
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+	return __pte_alloc_one_kernel(mm);
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+}
935 #endif
1036 
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-#define check_pgt_cache()          do { } while (0)
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+/**
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+ * pte_free_kernel - free PTE-level kernel page table page
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+ * @mm: the mm_struct of the current context
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+ * @pte: pointer to the memory containing the page table
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+ */
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+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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+{
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+	free_page((unsigned long)pte);
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+}
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+
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+/**
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+ * __pte_alloc_one - allocate a page for PTE-level user page table
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+ * @mm: the mm_struct of the current context
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+ * @gfp: GFP flags to use for the allocation
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+ *
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+ * Allocates a page and runs the pgtable_pte_page_ctor().
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+ *
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+ * This function is intended for architectures that need
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+ * anything beyond simple page allocation or must have custom GFP flags.
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+ *
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+ * Return: `struct page` initialized as page table or %NULL on error
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+ */
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+static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
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+{
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+	struct page *pte;
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+
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+	pte = alloc_page(gfp);
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+	if (!pte)
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+		return NULL;
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+	if (!pgtable_pte_page_ctor(pte)) {
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+		__free_page(pte);
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+		return NULL;
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+	}
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+
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+	return pte;
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+}
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+
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+#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
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+/**
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+ * pte_alloc_one - allocate a page for PTE-level user page table
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+ * @mm: the mm_struct of the current context
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+ *
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+ * Allocates a page and runs the pgtable_pte_page_ctor().
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+ *
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+ * Return: `struct page` initialized as page table or %NULL on error
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+ */
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+static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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+{
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+	return __pte_alloc_one(mm, GFP_PGTABLE_USER);
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+}
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+#endif
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+
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+/*
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+ * Should really implement gc for free page table pages. This could be
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+ * done with a reference count in struct page.
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+ */
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+
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+/**
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+ * pte_free - free PTE-level user page table page
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+ * @mm: the mm_struct of the current context
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+ * @pte_page: the `struct page` representing the page table
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+ */
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+static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
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+{
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+	pgtable_pte_page_dtor(pte_page);
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+	__free_page(pte_page);
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+}
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+
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+
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+#if CONFIG_PGTABLE_LEVELS > 2
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+
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+#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
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+/**
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+ * pmd_alloc_one - allocate a page for PMD-level page table
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+ * @mm: the mm_struct of the current context
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+ *
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+ * Allocates a page and runs the pgtable_pmd_page_ctor().
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+ * Allocations use %GFP_PGTABLE_USER in user context and
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+ * %GFP_PGTABLE_KERNEL in kernel context.
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+ *
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+ * Return: pointer to the allocated memory or %NULL on error
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+ */
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+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
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+{
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+	struct page *page;
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+	gfp_t gfp = GFP_PGTABLE_USER;
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+
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+	if (mm == &init_mm)
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+		gfp = GFP_PGTABLE_KERNEL;
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+	page = alloc_pages(gfp, 0);
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+	if (!page)
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+		return NULL;
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+	if (!pgtable_pmd_page_ctor(page)) {
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+		__free_pages(page, 0);
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+		return NULL;
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+	}
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+	return (pmd_t *)page_address(page);
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+}
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+#endif
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+
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+#ifndef __HAVE_ARCH_PMD_FREE
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+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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+{
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+	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
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+	pgtable_pmd_page_dtor(virt_to_page(pmd));
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+	free_page((unsigned long)pmd);
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+}
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+#endif
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+
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+#endif /* CONFIG_PGTABLE_LEVELS > 2 */
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+
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+#if CONFIG_PGTABLE_LEVELS > 3
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+
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+#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
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+/**
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+ * pud_alloc_one - allocate a page for PUD-level page table
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+ * @mm: the mm_struct of the current context
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+ *
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+ * Allocates a page using %GFP_PGTABLE_USER for user context and
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+ * %GFP_PGTABLE_KERNEL for kernel context.
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+ *
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+ * Return: pointer to the allocated memory or %NULL on error
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+ */
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+static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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+{
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+	gfp_t gfp = GFP_PGTABLE_USER;
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+
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+	if (mm == &init_mm)
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+		gfp = GFP_PGTABLE_KERNEL;
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+	return (pud_t *)get_zeroed_page(gfp);
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+}
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+#endif
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+
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+static inline void pud_free(struct mm_struct *mm, pud_t *pud)
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+{
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+	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
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+	free_page((unsigned long)pud);
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+}
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+
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+#endif /* CONFIG_PGTABLE_LEVELS > 3 */
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+
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+#ifndef __HAVE_ARCH_PGD_FREE
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+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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+{
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+	free_page((unsigned long)pgd);
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+}
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+#endif
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+
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+#endif /* CONFIG_MMU */
12186 
13187 #endif /* __ASM_GENERIC_PGALLOC_H */