Commit 82a1a1f3 authored by Qinglin Pan's avatar Qinglin Pan Committed by Palmer Dabbelt

riscv: mm: support Svnapot in hugetlb page

Svnapot can be used to support 64KB hugetlb page, so it can become a new
option when using hugetlbfs. Add a basic implementation of hugetlb page,
and support 64KB as a size in it by using Svnapot.

For test, boot kernel with command line contains "default_hugepagesz=64K
hugepagesz=64K hugepages=20" and run a simple test like this:

tools/testing/selftests/vm/map_hugetlb 1 16

And it should be passed.
Signed-off-by: default avatarQinglin Pan <panqinglin00@gmail.com>
Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230209131647.17245-3-panqinglin00@gmail.comSigned-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 23ad288a
......@@ -44,7 +44,7 @@ config RISCV
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_GENERAL_HUGETLB
select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT
select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
......
......@@ -2,7 +2,6 @@
#ifndef _ASM_RISCV_HUGETLB_H
#define _ASM_RISCV_HUGETLB_H
#include <asm-generic/hugetlb.h>
#include <asm/page.h>
static inline void arch_clear_hugepage_flags(struct page *page)
......@@ -11,4 +10,37 @@ static inline void arch_clear_hugepage_flags(struct page *page)
}
#define arch_clear_hugepage_flags arch_clear_hugepage_flags
#ifdef CONFIG_RISCV_ISA_SVNAPOT
#define __HAVE_ARCH_HUGE_PTE_CLEAR
void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz);
#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
void set_huge_pte_at(struct mm_struct *mm,
unsigned long addr, pte_t *ptep, pte_t pte);
#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty);
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
#define arch_make_huge_pte arch_make_huge_pte
#endif /*CONFIG_RISCV_ISA_SVNAPOT*/
#include <asm-generic/hugetlb.h>
#endif /* _ASM_RISCV_HUGETLB_H */
......@@ -2,6 +2,305 @@
#include <linux/hugetlb.h>
#include <linux/err.h>
#ifdef CONFIG_RISCV_ISA_SVNAPOT
pte_t *huge_pte_alloc(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long addr,
unsigned long sz)
{
unsigned long order;
pte_t *pte = NULL;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgd = pgd_offset(mm, addr);
p4d = p4d_alloc(mm, pgd, addr);
if (!p4d)
return NULL;
pud = pud_alloc(mm, p4d, addr);
if (!pud)
return NULL;
if (sz == PUD_SIZE) {
pte = (pte_t *)pud;
goto out;
}
if (sz == PMD_SIZE) {
if (want_pmd_share(vma, addr) && pud_none(*pud))
pte = huge_pmd_share(mm, vma, addr, pud);
else
pte = (pte_t *)pmd_alloc(mm, pud, addr);
goto out;
}
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return NULL;
for_each_napot_order(order) {
if (napot_cont_size(order) == sz) {
pte = pte_alloc_map(mm, pmd, addr & napot_cont_mask(order));
break;
}
}
out:
WARN_ON_ONCE(pte && pte_present(*pte) && !pte_huge(*pte));
return pte;
}
pte_t *huge_pte_offset(struct mm_struct *mm,
unsigned long addr,
unsigned long sz)
{
unsigned long order;
pte_t *pte = NULL;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd))
return NULL;
p4d = p4d_offset(pgd, addr);
if (!p4d_present(*p4d))
return NULL;
pud = pud_offset(p4d, addr);
if (sz == PUD_SIZE)
/* must be pud huge, non-present or none */
return (pte_t *)pud;
if (!pud_present(*pud))
return NULL;
pmd = pmd_offset(pud, addr);
if (sz == PMD_SIZE)
/* must be pmd huge, non-present or none */
return (pte_t *)pmd;
if (!pmd_present(*pmd))
return NULL;
for_each_napot_order(order) {
if (napot_cont_size(order) == sz) {
pte = pte_offset_kernel(pmd, addr & napot_cont_mask(order));
break;
}
}
return pte;
}
static pte_t get_clear_contig(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep,
unsigned long pte_num)
{
pte_t orig_pte = ptep_get(ptep);
unsigned long i;
for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) {
pte_t pte = ptep_get_and_clear(mm, addr, ptep);
if (pte_dirty(pte))
orig_pte = pte_mkdirty(orig_pte);
if (pte_young(pte))
orig_pte = pte_mkyoung(orig_pte);
}
return orig_pte;
}
static pte_t get_clear_contig_flush(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep,
unsigned long pte_num)
{
pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num);
struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
bool valid = !pte_none(orig_pte);
if (valid)
flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num));
return orig_pte;
}
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
{
unsigned long order;
for_each_napot_order(order) {
if (shift == napot_cont_shift(order)) {
entry = pte_mknapot(entry, order);
break;
}
}
if (order == NAPOT_ORDER_MAX)
entry = pte_mkhuge(entry);
return entry;
}
void set_huge_pte_at(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep,
pte_t pte)
{
int i, pte_num;
if (!pte_napot(pte)) {
set_pte_at(mm, addr, ptep, pte);
return;
}
pte_num = napot_pte_num(napot_cont_order(pte));
for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE)
set_pte_at(mm, addr, ptep, pte);
}
int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep,
pte_t pte,
int dirty)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long order;
pte_t orig_pte;
int i, pte_num;
if (!pte_napot(pte))
return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
order = napot_cont_order(pte);
pte_num = napot_pte_num(order);
ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
if (pte_dirty(orig_pte))
pte = pte_mkdirty(pte);
if (pte_young(orig_pte))
pte = pte_mkyoung(pte);
for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
set_pte_at(mm, addr, ptep, pte);
return true;
}
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep)
{
pte_t orig_pte = ptep_get(ptep);
int pte_num;
if (!pte_napot(orig_pte))
return ptep_get_and_clear(mm, addr, ptep);
pte_num = napot_pte_num(napot_cont_order(orig_pte));
return get_clear_contig(mm, addr, ptep, pte_num);
}
void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep)
{
pte_t pte = ptep_get(ptep);
unsigned long order;
int i, pte_num;
if (!pte_napot(pte)) {
ptep_set_wrprotect(mm, addr, ptep);
return;
}
order = napot_cont_order(pte);
pte_num = napot_pte_num(order);
ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
ptep_set_wrprotect(mm, addr, ptep);
}
pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep)
{
pte_t pte = ptep_get(ptep);
int pte_num;
if (!pte_napot(pte))
return ptep_clear_flush(vma, addr, ptep);
pte_num = napot_pte_num(napot_cont_order(pte));
return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num);
}
void huge_pte_clear(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep,
unsigned long sz)
{
pte_t pte = READ_ONCE(*ptep);
int i, pte_num;
if (!pte_napot(pte)) {
pte_clear(mm, addr, ptep);
return;
}
pte_num = napot_pte_num(napot_cont_order(pte));
for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
pte_clear(mm, addr, ptep);
}
static __init bool is_napot_size(unsigned long size)
{
unsigned long order;
if (!has_svnapot())
return false;
for_each_napot_order(order) {
if (size == napot_cont_size(order))
return true;
}
return false;
}
static __init int napot_hugetlbpages_init(void)
{
if (has_svnapot()) {
unsigned long order;
for_each_napot_order(order)
hugetlb_add_hstate(order);
}
return 0;
}
arch_initcall(napot_hugetlbpages_init);
#else
static __init bool is_napot_size(unsigned long size)
{
return false;
}
#endif /*CONFIG_RISCV_ISA_SVNAPOT*/
int pud_huge(pud_t pud)
{
return pud_leaf(pud);
......@@ -18,6 +317,8 @@ bool __init arch_hugetlb_valid_size(unsigned long size)
return true;
else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE)
return true;
else if (is_napot_size(size))
return true;
else
return false;
}
......
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