Re: [PATCH OLK-6.6 01/19] mm/hugetlb: Introduce hugetlb_insert_hugepage_pte[_by_pa]

On 2023/12/4 17:17, Wang Wensheng wrote:

ascend inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8LNGH

---

Add hugetlb_insert_hugepage_pte[_by_pa] to insert hugepages into process page table. The by_pa version performs like remap_pfn_range() that make the pte special and can be used for reserved physical memory.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com

include/linux/hugetlb.h | 32 +++++++++++++++++++ mm/Kconfig | 15 +++++++++ mm/hugetlb.c | 70 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 117 insertions(+)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 47d25a5e1933..57c2630cb80d 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -282,6 +282,26 @@ long hugetlb_change_protection(struct vm_area_struct *vma, bool is_hugetlb_entry_migration(pte_t pte); void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);

+#ifdef CONFIG_HUGETLB_INSERT_PAGE +int hugetlb_insert_hugepage_pte(struct mm_struct *mm, unsigned long addr,

• 		pgprot_t prot, struct page *hpage);
  

+int hugetlb_insert_hugepage_pte_by_pa(struct mm_struct *mm,

• 		unsigned long vir_addr,
  

• 		pgprot_t prot, unsigned long phy_addr);
  

+#else /* CONFIG_HUGETLB_INSERT_PAGE */ +static inline int hugetlb_insert_hugepage_pte(struct mm_struct *mm, unsigned long addr,

• 		pgprot_t prot, struct page *hpage)
  

+{

• return -EPERM;

+} +static inline int hugetlb_insert_hugepage_pte_by_pa(struct mm_struct *mm,

• 		unsigned long vir_addr,
  

• 		pgprot_t prot, unsigned long phy_addr)
  

+{

• return -EPERM;

+} +#endif /* CONFIG_HUGETLB_INSERT_PAGE */

• #else /* !CONFIG_HUGETLB_PAGE */

  static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma)

@@ -491,6 +511,18 @@ static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,

static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }

+static inline int hugetlb_insert_hugepage_pte(struct mm_struct *mm, unsigned long addr,

• 		pgprot_t prot, struct page *hpage)
  

+{

• return -EPERM;

+} +static inline int hugetlb_insert_hugepage_pte_by_pa(struct mm_struct *mm,

• 		unsigned long vir_addr,
  

• 		pgprot_t prot, unsigned long phy_addr)
  

+{

• return -EPERM;

+}

• #endif /* !CONFIG_HUGETLB_PAGE */ /*
  • hugepages at page global directory. If arch support

diff --git a/mm/Kconfig b/mm/Kconfig index ece4f2847e2b..3dead7328cd5 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1269,6 +1269,21 @@ config LOCK_MM_AND_FIND_VMA bool depends on !STACK_GROWSUP

+menuconfig ASCEND_FEATURES

• bool "Support Ascend Features"
• depends on ARM64
• select HUGETLB_INSERT_PAGE
• help

•  The Ascend chip use the Hisilicon DaVinci architecture, and mainly
  

•  focus on AI and machine leanring area, contains many external features.
  

•  Enable this config to enable selective list of these features.
  

•  If unsure, say N
  

+config HUGETLB_INSERT_PAGE

• bool
• help

•  This allowed a driver to insert hugetlb mapping into user address space.
  

endmenu ?