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powerpc/mm: Make a copy of pgalloc.h for 32 and 64 book3s
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This patch start to make a book3s variant for pgalloc headers. We have
multiple book3s specific changes such as:
  * 4 level page table
  * store physical address in higher level table
  * use pte_t * for pgtable_t

Having a book3s64 specific variant helps to keep code simpler and remove
lots of #ifdef around code.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Aneesh Kumar K.V authored and Michael Ellerman committed May 11, 2016
1 parent b5dcc60 commit 101ad5c
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109 changes: 109 additions & 0 deletions arch/powerpc/include/asm/book3s/32/pgalloc.h
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#ifndef _ASM_POWERPC_PGALLOC_32_H
#define _ASM_POWERPC_PGALLOC_32_H

#include <linux/threads.h>

/* For 32-bit, all levels of page tables are just drawn from get_free_page() */
#define MAX_PGTABLE_INDEX_SIZE 0

extern void __bad_pte(pmd_t *pmd);

extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);

/*
* We don't have any real pmd's, and this code never triggers because
* the pgd will always be present..
*/
/* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */
#define pmd_free(mm, x) do { } while (0)
#define __pmd_free_tlb(tlb,x,a) do { } while (0)
/* #define pgd_populate(mm, pmd, pte) BUG() */

#ifndef CONFIG_BOOKE

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
pte_t *pte)
{
*pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pte_page)
{
*pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT);
}

#define pmd_pgtable(pmd) pmd_page(pmd)
#else

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
pte_t *pte)
{
*pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pte_page)
{
*pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT);
}

#define pmd_pgtable(pmd) pmd_page(pmd)
#endif

extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long)pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
pgtable_page_dtor(ptepage);
__free_page(ptepage);
}

static inline void pgtable_free(void *table, unsigned index_size)
{
BUG_ON(index_size); /* 32-bit doesn't use this */
free_page((unsigned long)table);
}

#define check_pgt_cache() do { } while (0)

#ifdef CONFIG_SMP
static inline void pgtable_free_tlb(struct mmu_gather *tlb,
void *table, int shift)
{
unsigned long pgf = (unsigned long)table;
BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
pgf |= shift;
tlb_remove_table(tlb, (void *)pgf);
}

static inline void __tlb_remove_table(void *_table)
{
void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;

pgtable_free(table, shift);
}
#else
static inline void pgtable_free_tlb(struct mmu_gather *tlb,
void *table, int shift)
{
pgtable_free(table, shift);
}
#endif

static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
unsigned long address)
{
tlb_flush_pgtable(tlb, address);
pgtable_page_dtor(table);
pgtable_free_tlb(tlb, page_address(table), 0);
}
#endif /* _ASM_POWERPC_PGALLOC_32_H */
266 changes: 266 additions & 0 deletions arch/powerpc/include/asm/book3s/64/pgalloc.h
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#ifndef _ASM_POWERPC_PGALLOC_64_H
#define _ASM_POWERPC_PGALLOC_64_H
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/

#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>

struct vmemmap_backing {
struct vmemmap_backing *list;
unsigned long phys;
unsigned long virt_addr;
};
extern struct vmemmap_backing *vmemmap_list;

/*
* Functions that deal with pagetables that could be at any level of
* the table need to be passed an "index_size" so they know how to
* handle allocation. For PTE pages (which are linked to a struct
* page for now, and drawn from the main get_free_pages() pool), the
* allocation size will be (2^index_size * sizeof(pointer)) and
* allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
*
* The maximum index size needs to be big enough to allow any
* pagetable sizes we need, but small enough to fit in the low bits of
* any page table pointer. In other words all pagetables, even tiny
* ones, must be aligned to allow at least enough low 0 bits to
* contain this value. This value is also used as a mask, so it must
* be one less than a power of two.
*/
#define MAX_PGTABLE_INDEX_SIZE 0xf

extern struct kmem_cache *pgtable_cache[];
#define PGT_CACHE(shift) ({ \
BUG_ON(!(shift)); \
pgtable_cache[(shift) - 1]; \
})

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
}

#ifndef CONFIG_PPC_64K_PAGES

#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, __pgtable_ptr_val(PUD))

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
GFP_KERNEL|__GFP_REPEAT);
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
pud_set(pud, __pgtable_ptr_val(pmd));
}

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
pte_t *pte)
{
pmd_set(pmd, __pgtable_ptr_val(pte));
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
pgtable_t pte_page)
{
pmd_set(pmd, __pgtable_ptr_val(page_address(pte_page)));
}

#define pmd_pgtable(pmd) pmd_page(pmd)

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
struct page *page;
pte_t *pte;

pte = pte_alloc_one_kernel(mm, address);
if (!pte)
return NULL;
page = virt_to_page(pte);
if (!pgtable_page_ctor(page)) {
__free_page(page);
return NULL;
}
return page;
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long)pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
pgtable_page_dtor(ptepage);
__free_page(ptepage);
}

static inline void pgtable_free(void *table, unsigned index_size)
{
if (!index_size)
free_page((unsigned long)table);
else {
BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
kmem_cache_free(PGT_CACHE(index_size), table);
}
}

#ifdef CONFIG_SMP
static inline void pgtable_free_tlb(struct mmu_gather *tlb,
void *table, int shift)
{
unsigned long pgf = (unsigned long)table;
BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
pgf |= shift;
tlb_remove_table(tlb, (void *)pgf);
}

static inline void __tlb_remove_table(void *_table)
{
void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;

pgtable_free(table, shift);
}
#else /* !CONFIG_SMP */
static inline void pgtable_free_tlb(struct mmu_gather *tlb,
void *table, int shift)
{
pgtable_free(table, shift);
}
#endif /* CONFIG_SMP */

static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
unsigned long address)
{
tlb_flush_pgtable(tlb, address);
pgtable_page_dtor(table);
pgtable_free_tlb(tlb, page_address(table), 0);
}

#else /* if CONFIG_PPC_64K_PAGES */

extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
extern void page_table_free(struct mm_struct *, unsigned long *, int);
extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
#ifdef CONFIG_SMP
extern void __tlb_remove_table(void *_table);
#endif

#ifndef __PAGETABLE_PUD_FOLDED
/* book3s 64 is 4 level page table */
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
pgd_set(pgd, __pgtable_ptr_val(pud));
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
GFP_KERNEL|__GFP_REPEAT);
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
}
#endif

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
pud_set(pud, __pgtable_ptr_val(pmd));
}

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
pte_t *pte)
{
pmd_set(pmd, __pgtable_ptr_val(pte));
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
pgtable_t pte_page)
{
pmd_set(pmd, __pgtable_ptr_val(pte_page));
}

static inline pgtable_t pmd_pgtable(pmd_t pmd)
{
return (pgtable_t)pmd_page_vaddr(pmd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
return (pte_t *)page_table_alloc(mm, address, 1);
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
return (pgtable_t)page_table_alloc(mm, address, 0);
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
page_table_free(mm, (unsigned long *)pte, 1);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
page_table_free(mm, (unsigned long *)ptepage, 0);
}

static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
unsigned long address)
{
tlb_flush_pgtable(tlb, address);
pgtable_free_tlb(tlb, table, 0);
}
#endif /* CONFIG_PPC_64K_PAGES */

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
GFP_KERNEL|__GFP_REPEAT);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
}

#define __pmd_free_tlb(tlb, pmd, addr) \
pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
#ifndef __PAGETABLE_PUD_FOLDED
#define __pud_free_tlb(tlb, pud, addr) \
pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)

#endif /* __PAGETABLE_PUD_FOLDED */

#define check_pgt_cache() do { } while (0)

#endif /* _ASM_POWERPC_PGALLOC_64_H */

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