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[v8,2/3] riscv: mm: support Svnapot in hugetlb page

Message ID 20221128022719.328770-3-panqinglin2020@iscas.ac.cn (mailing list archive)
State Superseded
Headers show
Series riscv, mm: detect svnapot cpu support at runtime | expand

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Commit Message

Qinglin Pan Nov. 28, 2022, 2:27 a.m. UTC 
From: Qinglin Pan <panqinglin2020@iscas.ac.cn>

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: Qinglin Pan <panqinglin2020@iscas.ac.cn>

Comments

Andrew Jones Nov. 29, 2022, 1:01 p.m. UTC | #1 
On Mon, Nov 28, 2022 at 10:27:18AM +0800, panqinglin2020@iscas.ac.cn wrote:
> From: Qinglin Pan <panqinglin2020@iscas.ac.cn>
> 
> 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: Qinglin Pan <panqinglin2020@iscas.ac.cn>
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 1671938f2f81..19774b8289dc 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -43,7 +43,7 @@ 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
> diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
> index a5c2ca1d1cd8..854f5db2f45d 100644
> --- a/arch/riscv/include/asm/hugetlb.h
> +++ b/arch/riscv/include/asm/hugetlb.h
> @@ -2,7 +2,39 @@
>  #ifndef _ASM_RISCV_HUGETLB_H
>  #define _ASM_RISCV_HUGETLB_H
>  
> -#include <asm-generic/hugetlb.h>
>  #include <asm/page.h>
>  
> +#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 */
> diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
> index 932dadfdca54..5ff72163c4ae 100644
> --- a/arch/riscv/mm/hugetlbpage.c
> +++ b/arch/riscv/mm/hugetlbpage.c
> @@ -2,6 +2,298 @@
>  #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)
> +{
> +	pgd_t *pgd;
> +	p4d_t *p4d;
> +	pud_t *pud;
> +	pmd_t *pmd;
> +	pte_t *pte = NULL;
> +	unsigned long order;
> +
> +	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 (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; order++) {

for_each_napot_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)
> +{
> +	pgd_t *pgd;
> +	p4d_t *p4d;
> +	pud_t *pud;
> +	pmd_t *pmd;
> +	pte_t *pte = NULL;
> +	unsigned long order;
> +
> +	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 (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; order++) {

for_each_napot_order

> +		if (napot_cont_size(order) == sz) {
> +			pte = pte_offset_kernel(pmd, (addr & ~napot_cont_mask(order)));

Shouldn't we define napot_cont_mask like PAGE_MASK and arm's
CONT_PTE_MASK, i.e. put the ~ in the defination?

> +			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);
> +	bool valid = !pte_none(orig_pte);
> +	struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
> +
> +	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;
> +	int 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)
> +{
> +	pte_t orig_pte;
> +	int i;
> +	int pte_num;
> +	struct mm_struct *mm = vma->vm_mm;
> +
> +	if (!pte_napot(pte))
> +		return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
> +
> +	pte_num = napot_pte_num(napot_cont_order(pte));
> +	ptep = huge_pte_offset(mm, addr,
> +			       napot_cont_size(napot_cont_order(pte)));
> +	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)
> +{
> +	int pte_num;
> +	pte_t orig_pte = ptep_get(ptep);
> +
> +	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)
> +{
> +	int i;
> +	int pte_num;
> +	pte_t pte = ptep_get(ptep);
> +
> +	if (!pte_napot(pte)) {
> +		ptep_set_wrprotect(mm, addr, ptep);
> +		return;
> +	}
> +
> +	pte_num = napot_pte_num(napot_cont_order(pte));
> +	ptep = huge_pte_offset(mm, addr, napot_cont_size(4UL));

Should pass napot_cont_order(pte) to napot_cont_size(), not a
hard coded 4.

> +
> +	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)
> +{
> +	int pte_num;
> +	pte_t pte = ptep_get(ptep);
> +
> +	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)
> +{
> +	int i, pte_num = 1;
> +	pte_t pte = READ_ONCE(*ptep);
> +
> +	if (pte_napot(pte))
> +		pte_num = napot_pte_num(napot_cont_order(pte));

I'd prefer the same pattern be used here as all the other functions, i.e.

  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);
> +}
> +
> +bool __init 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
> +
> +bool __init 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 +310,8 @@ 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;
>  }
> -- 
> 2.37.4
>

Thanks,
drew
Qinglin Pan Dec. 4, 2022, 9:24 a.m. UTC | #2 
Hi Andrew,

On 2022/11/29 21:01, Andrew Jones wrote:
> On Mon, Nov 28, 2022 at 10:27:18AM +0800, panqinglin2020@iscas.ac.cn wrote:
>> From: Qinglin Pan <panqinglin2020@iscas.ac.cn>
>>
>> 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: Qinglin Pan <panqinglin2020@iscas.ac.cn>
>>
>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>> index 1671938f2f81..19774b8289dc 100644
>> --- a/arch/riscv/Kconfig
>> +++ b/arch/riscv/Kconfig
>> @@ -43,7 +43,7 @@ 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
>> diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
>> index a5c2ca1d1cd8..854f5db2f45d 100644
>> --- a/arch/riscv/include/asm/hugetlb.h
>> +++ b/arch/riscv/include/asm/hugetlb.h
>> @@ -2,7 +2,39 @@
>>   #ifndef _ASM_RISCV_HUGETLB_H
>>   #define _ASM_RISCV_HUGETLB_H
>>   
>> -#include <asm-generic/hugetlb.h>
>>   #include <asm/page.h>
>>   
>> +#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 */
>> diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
>> index 932dadfdca54..5ff72163c4ae 100644
>> --- a/arch/riscv/mm/hugetlbpage.c
>> +++ b/arch/riscv/mm/hugetlbpage.c
>> @@ -2,6 +2,298 @@
>>   #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)
>> +{
>> +	pgd_t *pgd;
>> +	p4d_t *p4d;
>> +	pud_t *pud;
>> +	pmd_t *pmd;
>> +	pte_t *pte = NULL;
>> +	unsigned long order;
>> +
>> +	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 (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; order++) {
> 
> for_each_napot_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)
>> +{
>> +	pgd_t *pgd;
>> +	p4d_t *p4d;
>> +	pud_t *pud;
>> +	pmd_t *pmd;
>> +	pte_t *pte = NULL;
>> +	unsigned long order;
>> +
>> +	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 (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; order++) {
> 
> for_each_napot_order
> 
>> +		if (napot_cont_size(order) == sz) {
>> +			pte = pte_offset_kernel(pmd, (addr & ~napot_cont_mask(order)));
> 
> Shouldn't we define napot_cont_mask like PAGE_MASK and arm's
> CONT_PTE_MASK, i.e. put the ~ in the defination?
> 
>> +			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);
>> +	bool valid = !pte_none(orig_pte);
>> +	struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
>> +
>> +	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;
>> +	int 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)
>> +{
>> +	pte_t orig_pte;
>> +	int i;
>> +	int pte_num;
>> +	struct mm_struct *mm = vma->vm_mm;
>> +
>> +	if (!pte_napot(pte))
>> +		return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
>> +
>> +	pte_num = napot_pte_num(napot_cont_order(pte));
>> +	ptep = huge_pte_offset(mm, addr,
>> +			       napot_cont_size(napot_cont_order(pte)));
>> +	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)
>> +{
>> +	int pte_num;
>> +	pte_t orig_pte = ptep_get(ptep);
>> +
>> +	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)
>> +{
>> +	int i;
>> +	int pte_num;
>> +	pte_t pte = ptep_get(ptep);
>> +
>> +	if (!pte_napot(pte)) {
>> +		ptep_set_wrprotect(mm, addr, ptep);
>> +		return;
>> +	}
>> +
>> +	pte_num = napot_pte_num(napot_cont_order(pte));
>> +	ptep = huge_pte_offset(mm, addr, napot_cont_size(4UL));
> 
> Should pass napot_cont_order(pte) to napot_cont_size(), not a
> hard coded 4.
> 
>> +
>> +	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)
>> +{
>> +	int pte_num;
>> +	pte_t pte = ptep_get(ptep);
>> +
>> +	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)
>> +{
>> +	int i, pte_num = 1;
>> +	pte_t pte = READ_ONCE(*ptep);
>> +
>> +	if (pte_napot(pte))
>> +		pte_num = napot_pte_num(napot_cont_order(pte));
> 
> I'd prefer the same pattern be used here as all the other functions, i.e.
> 
>    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);
>> +}
>> +
>> +bool __init 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
>> +
>> +bool __init 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 +310,8 @@ 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;
>>   }
>> -- 
>> 2.37.4
>>
> 
> Thanks,
> drew

Go it all. Will fix them in next version.

Thanks,
Qinglin
diff mbox series

Patch

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 1671938f2f81..19774b8289dc 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -43,7 +43,7 @@  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
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index a5c2ca1d1cd8..854f5db2f45d 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -2,7 +2,39 @@ 
 #ifndef _ASM_RISCV_HUGETLB_H
 #define _ASM_RISCV_HUGETLB_H
 
-#include <asm-generic/hugetlb.h>
 #include <asm/page.h>
 
+#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 */
diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index 932dadfdca54..5ff72163c4ae 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -2,6 +2,298 @@ 
 #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)
+{
+	pgd_t *pgd;
+	p4d_t *p4d;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte = NULL;
+	unsigned long order;
+
+	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 (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; 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)
+{
+	pgd_t *pgd;
+	p4d_t *p4d;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte = NULL;
+	unsigned long order;
+
+	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 (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; 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);
+	bool valid = !pte_none(orig_pte);
+	struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
+
+	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;
+	int 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)
+{
+	pte_t orig_pte;
+	int i;
+	int pte_num;
+	struct mm_struct *mm = vma->vm_mm;
+
+	if (!pte_napot(pte))
+		return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
+
+	pte_num = napot_pte_num(napot_cont_order(pte));
+	ptep = huge_pte_offset(mm, addr,
+			       napot_cont_size(napot_cont_order(pte)));
+	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)
+{
+	int pte_num;
+	pte_t orig_pte = ptep_get(ptep);
+
+	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)
+{
+	int i;
+	int pte_num;
+	pte_t pte = ptep_get(ptep);
+
+	if (!pte_napot(pte)) {
+		ptep_set_wrprotect(mm, addr, ptep);
+		return;
+	}
+
+	pte_num = napot_pte_num(napot_cont_order(pte));
+	ptep = huge_pte_offset(mm, addr, napot_cont_size(4UL));
+
+	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)
+{
+	int pte_num;
+	pte_t pte = ptep_get(ptep);
+
+	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)
+{
+	int i, pte_num = 1;
+	pte_t pte = READ_ONCE(*ptep);
+
+	if (pte_napot(pte))
+		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);
+}
+
+bool __init 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
+
+bool __init 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 +310,8 @@  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;
 }