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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_GENERIC_PGALLOC_H
#define __ASM_GENERIC_PGALLOC_H
#ifdef CONFIG_MMU
#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
/**
* __pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
* @mm: the mm_struct of the current context
*
* This function is intended for architectures that need
* anything beyond simple page allocation.
*
* Return: pointer to the allocated memory or %NULL on error
*/
static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
{
struct ptdesc *ptdesc = pagetable_alloc(GFP_PGTABLE_KERNEL &
~__GFP_HIGHMEM, 0);
if (!ptdesc)
return NULL;
return ptdesc_address(ptdesc);
}
#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
/**
* pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
* @mm: the mm_struct of the current context
*
* Return: pointer to the allocated memory or %NULL on error
*/
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
{
return __pte_alloc_one_kernel(mm);
}
#endif
/**
* pte_free_kernel - free PTE-level kernel page table memory
* @mm: the mm_struct of the current context
* @pte: pointer to the memory containing the page table
*/
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
pagetable_free(virt_to_ptdesc(pte));
}
/**
* __pte_alloc_one - allocate memory for a PTE-level user page table
* @mm: the mm_struct of the current context
* @gfp: GFP flags to use for the allocation
*
* Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
*
* This function is intended for architectures that need
* anything beyond simple page allocation or must have custom GFP flags.
*
* Return: `struct page` referencing the ptdesc or %NULL on error
*/
static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
{
struct ptdesc *ptdesc;
ptdesc = pagetable_alloc(gfp, 0);
if (!ptdesc)
return NULL;
if (!pagetable_pte_ctor(ptdesc)) {
pagetable_free(ptdesc);
return NULL;
}
return ptdesc_page(ptdesc);
}
#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
/**
* pte_alloc_one - allocate a page for PTE-level user page table
* @mm: the mm_struct of the current context
*
* Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
*
* Return: `struct page` referencing the ptdesc or %NULL on error
*/
static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
{
return __pte_alloc_one(mm, GFP_PGTABLE_USER);
}
#endif
/*
* Should really implement gc for free page table pages. This could be
* done with a reference count in struct page.
*/
/**
* pte_free - free PTE-level user page table memory
* @mm: the mm_struct of the current context
* @pte_page: the `struct page` referencing the ptdesc
*/
static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
{
struct ptdesc *ptdesc = page_ptdesc(pte_page);
pagetable_pte_dtor(ptdesc);
pagetable_free(ptdesc);
}
#if CONFIG_PGTABLE_LEVELS > 2
#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
/**
* pmd_alloc_one - allocate memory for a PMD-level page table
* @mm: the mm_struct of the current context
*
* Allocate memory for a page table and ptdesc and runs pagetable_pmd_ctor().
*
* Allocations use %GFP_PGTABLE_USER in user context and
* %GFP_PGTABLE_KERNEL in kernel context.
*
* Return: pointer to the allocated memory or %NULL on error
*/
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
struct ptdesc *ptdesc;
gfp_t gfp = GFP_PGTABLE_USER;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
ptdesc = pagetable_alloc(gfp, 0);
if (!ptdesc)
return NULL;
if (!pagetable_pmd_ctor(ptdesc)) {
pagetable_free(ptdesc);
return NULL;
}
return ptdesc_address(ptdesc);
}
#endif
#ifndef __HAVE_ARCH_PMD_FREE
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
pagetable_pmd_dtor(ptdesc);
pagetable_free(ptdesc);
}
#endif
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
#if CONFIG_PGTABLE_LEVELS > 3
static inline pud_t *__pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
gfp_t gfp = GFP_PGTABLE_USER;
struct ptdesc *ptdesc;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
gfp &= ~__GFP_HIGHMEM;
ptdesc = pagetable_alloc(gfp, 0);
if (!ptdesc)
return NULL;
return ptdesc_address(ptdesc);
}
#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
/**
* pud_alloc_one - allocate memory for a PUD-level page table
* @mm: the mm_struct of the current context
*
* Allocate memory for a page table using %GFP_PGTABLE_USER for user context
* and %GFP_PGTABLE_KERNEL for kernel context.
*
* Return: pointer to the allocated memory or %NULL on error
*/
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return __pud_alloc_one(mm, addr);
}
#endif
static inline void __pud_free(struct mm_struct *mm, pud_t *pud)
{
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
pagetable_free(virt_to_ptdesc(pud));
}
#ifndef __HAVE_ARCH_PUD_FREE
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
__pud_free(mm, pud);
}
#endif
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#ifndef __HAVE_ARCH_PGD_FREE
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
pagetable_free(virt_to_ptdesc(pgd));
}
#endif
#endif /* CONFIG_MMU */
#endif /* __ASM_GENERIC_PGALLOC_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| bitops | Folder | 0755 |
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| vdso | Folder | 0755 |
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| Kbuild | File | 1.68 KB | 0644 |
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| access_ok.h | File | 1.37 KB | 0644 |
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| archrandom.h | File | 342 B | 0644 |
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| asm-offsets.h | File | 35 B | 0644 |
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| asm-prototypes.h | File | 507 B | 0644 |
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| atomic.h | File | 3.49 KB | 0644 |
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| atomic64.h | File | 2.49 KB | 0644 |
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| audit_change_attr.h | File | 484 B | 0644 |
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| audit_dir_write.h | File | 528 B | 0644 |
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| audit_read.h | File | 241 B | 0644 |
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| audit_signal.h | File | 36 B | 0644 |
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| audit_write.h | File | 461 B | 0644 |
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| barrier.h | File | 7.13 KB | 0644 |
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| bitops.h | File | 1.13 KB | 0644 |
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| bitsperlong.h | File | 1.18 KB | 0644 |
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| bug.h | File | 6.22 KB | 0644 |
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| cache.h | File | 384 B | 0644 |
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| cacheflush.h | File | 2.51 KB | 0644 |
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| cfi.h | File | 129 B | 0644 |
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| checksum.h | File | 1.6 KB | 0644 |
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| cmpxchg-local.h | File | 1.43 KB | 0644 |
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| cmpxchg.h | File | 2.38 KB | 0644 |
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| compat.h | File | 3.67 KB | 0644 |
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| current.h | File | 256 B | 0644 |
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| delay.h | File | 1.13 KB | 0644 |
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| device.h | File | 245 B | 0644 |
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| div64.h | File | 7.48 KB | 0644 |
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| dma-mapping.h | File | 232 B | 0644 |
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| dma.h | File | 553 B | 0644 |
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| early_ioremap.h | File | 1.47 KB | 0644 |
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| emergency-restart.h | File | 248 B | 0644 |
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| error-injection.h | File | 1.13 KB | 0644 |
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| exec.h | File | 460 B | 0644 |
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| export.h | File | 369 B | 0644 |
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| extable.h | File | 802 B | 0644 |
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| fb.h | File | 2.85 KB | 0644 |
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| fixmap.h | File | 2.86 KB | 0644 |
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| ftrace.h | File | 314 B | 0644 |
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| futex.h | File | 2.59 KB | 0644 |
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| getorder.h | File | 1.23 KB | 0644 |
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| hardirq.h | File | 568 B | 0644 |
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| hugetlb.h | File | 3.48 KB | 0644 |
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| hw_irq.h | File | 270 B | 0644 |
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| ide_iops.h | File | 791 B | 0644 |
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| int-ll64.h | File | 863 B | 0644 |
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| io.h | File | 26.38 KB | 0644 |
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| ioctl.h | File | 506 B | 0644 |
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| iomap.h | File | 3.92 KB | 0644 |
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| irq.h | File | 403 B | 0644 |
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| irq_regs.h | File | 773 B | 0644 |
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| irq_work.h | File | 194 B | 0644 |
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| irqflags.h | File | 1.51 KB | 0644 |
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| kdebug.h | File | 182 B | 0644 |
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| kmap_size.h | File | 263 B | 0644 |
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| kprobes.h | File | 833 B | 0644 |
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| kvm_para.h | File | 549 B | 0644 |
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| kvm_types.h | File | 113 B | 0644 |
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| linkage.h | File | 225 B | 0644 |
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| local.h | File | 2.31 KB | 0644 |
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| local64.h | File | 4.04 KB | 0644 |
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| logic_io.h | File | 2.35 KB | 0644 |
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| mcs_spinlock.h | File | 260 B | 0644 |
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| memory_model.h | File | 1.75 KB | 0644 |
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| mm_hooks.h | File | 753 B | 0644 |
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| mmiowb.h | File | 1.72 KB | 0644 |
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| mmiowb_types.h | File | 249 B | 0644 |
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| mmu.h | File | 449 B | 0644 |
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| mmu_context.h | File | 1.62 KB | 0644 |
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| module.h | File | 1.09 KB | 0644 |
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| module.lds.h | File | 278 B | 0644 |
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| mshyperv.h | File | 11.13 KB | 0644 |
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| msi.h | File | 1.01 KB | 0644 |
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| nommu_context.h | File | 420 B | 0644 |
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| numa.h | File | 1.6 KB | 0644 |
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| page.h | File | 2.3 KB | 0644 |
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| param.h | File | 367 B | 0644 |
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| parport.h | File | 604 B | 0644 |
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| pci.h | File | 655 B | 0644 |
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| pci_iomap.h | File | 1.96 KB | 0644 |
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| percpu.h | File | 15.2 KB | 0644 |
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| pgalloc.h | File | 5.28 KB | 0644 |
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| pgtable-nop4d.h | File | 1.72 KB | 0644 |
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| pgtable-nopmd.h | File | 1.99 KB | 0644 |
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| pgtable-nopud.h | File | 1.95 KB | 0644 |
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| pgtable_uffd.h | File | 1.03 KB | 0644 |
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| preempt.h | File | 1.95 KB | 0644 |
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| qrwlock.h | File | 3.99 KB | 0644 |
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| qrwlock_types.h | File | 683 B | 0644 |
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| qspinlock.h | File | 4.67 KB | 0644 |
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| qspinlock_types.h | File | 2.08 KB | 0644 |
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| resource.h | File | 1.07 KB | 0644 |
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| runtime-const.h | File | 414 B | 0644 |
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| rwonce.h | File | 2.86 KB | 0644 |
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| seccomp.h | File | 1.16 KB | 0644 |
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| sections.h | File | 7.16 KB | 0644 |
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| serial.h | File | 345 B | 0644 |
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| set_memory.h | File | 362 B | 0644 |
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| shmparam.h | File | 207 B | 0644 |
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| signal.h | File | 308 B | 0644 |
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| simd.h | File | 436 B | 0644 |
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| softirq_stack.h | File | 281 B | 0644 |
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| spinlock.h | File | 2.73 KB | 0644 |
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| spinlock_types.h | File | 404 B | 0644 |
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| statfs.h | File | 169 B | 0644 |
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| string.h | File | 281 B | 0644 |
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| switch_to.h | File | 755 B | 0644 |
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| syscall.h | File | 5.02 KB | 0644 |
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| syscalls.h | File | 739 B | 0644 |
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| termios.h | File | 205 B | 0644 |
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| timex.h | File | 508 B | 0644 |
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| tlb.h | File | 20.38 KB | 0644 |
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| tlbflush.h | File | 485 B | 0644 |
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| topology.h | File | 2.17 KB | 0644 |
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| trace_clock.h | File | 391 B | 0644 |
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| uaccess.h | File | 5.51 KB | 0644 |
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| unaligned.h | File | 3.32 KB | 0644 |
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| user.h | File | 242 B | 0644 |
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| vermagic.h | File | 179 B | 0644 |
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| vga.h | File | 587 B | 0644 |
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| vmlinux.lds.h | File | 32.04 KB | 0644 |
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| vtime.h | File | 52 B | 0644 |
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| word-at-a-time.h | File | 2.75 KB | 0644 |
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| xor.h | File | 14.33 KB | 0644 |
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