-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
parisc: Add Huge Page and HUGETLBFS support
This patch adds huge page support to allow userspace to allocate huge pages and to use hugetlbfs filesystem on 32- and 64-bit Linux kernels. A later patch will add kernel support to map kernel text and data on huge pages. The only requirement is, that the kernel needs to be compiled for a PA8X00 CPU (PA2.0 architecture). Older PA1.X CPUs do not support variable page sizes. 64bit Kernels are compiled for PA2.0 by default. Technically on parisc multiple physical huge pages may be needed to emulate standard 2MB huge pages. Signed-off-by: Helge Deller <deller@gmx.de>
- Loading branch information
Helge Deller
committed
Nov 22, 2015
1 parent
337685e
commit 736d216
Showing
6 changed files
with
291 additions
and
15 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| #ifndef _ASM_PARISC64_HUGETLB_H | ||
| #define _ASM_PARISC64_HUGETLB_H | ||
|
|
||
| #include <asm/page.h> | ||
| #include <asm-generic/hugetlb.h> | ||
|
|
||
|
|
||
| void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, | ||
| pte_t *ptep, pte_t pte); | ||
|
|
||
| pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, | ||
| pte_t *ptep); | ||
|
|
||
| static inline int is_hugepage_only_range(struct mm_struct *mm, | ||
| unsigned long addr, | ||
| unsigned long len) { | ||
| return 0; | ||
| } | ||
|
|
||
| /* | ||
| * If the arch doesn't supply something else, assume that hugepage | ||
| * size aligned regions are ok without further preparation. | ||
| */ | ||
| static inline int prepare_hugepage_range(struct file *file, | ||
| unsigned long addr, unsigned long len) | ||
| { | ||
| if (len & ~HPAGE_MASK) | ||
| return -EINVAL; | ||
| if (addr & ~HPAGE_MASK) | ||
| return -EINVAL; | ||
| return 0; | ||
| } | ||
|
|
||
| static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, | ||
| unsigned long addr, unsigned long end, | ||
| unsigned long floor, | ||
| unsigned long ceiling) | ||
| { | ||
| free_pgd_range(tlb, addr, end, floor, ceiling); | ||
| } | ||
|
|
||
| static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, | ||
| unsigned long addr, pte_t *ptep) | ||
| { | ||
| } | ||
|
|
||
| static inline int huge_pte_none(pte_t pte) | ||
| { | ||
| return pte_none(pte); | ||
| } | ||
|
|
||
| static inline pte_t huge_pte_wrprotect(pte_t pte) | ||
| { | ||
| return pte_wrprotect(pte); | ||
| } | ||
|
|
||
| static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, | ||
| unsigned long addr, pte_t *ptep) | ||
| { | ||
| pte_t old_pte = *ptep; | ||
| set_huge_pte_at(mm, addr, ptep, pte_wrprotect(old_pte)); | ||
| } | ||
|
|
||
| static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, | ||
| unsigned long addr, pte_t *ptep, | ||
| pte_t pte, int dirty) | ||
| { | ||
| int changed = !pte_same(*ptep, pte); | ||
| if (changed) { | ||
| set_huge_pte_at(vma->vm_mm, addr, ptep, pte); | ||
| flush_tlb_page(vma, addr); | ||
| } | ||
| return changed; | ||
| } | ||
|
|
||
| static inline pte_t huge_ptep_get(pte_t *ptep) | ||
| { | ||
| return *ptep; | ||
| } | ||
|
|
||
| static inline void arch_clear_hugepage_flags(struct page *page) | ||
| { | ||
| } | ||
|
|
||
| #endif /* _ASM_PARISC64_HUGETLB_H */ |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -3,3 +3,4 @@ | |
| # | ||
|
|
||
| obj-y := init.o fault.o ioremap.o | ||
| obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o | ||
Oops, something went wrong.