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| author | Enze Li <lienze@kylinos.cn> | 2023-09-06 22:53:55 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-09-06 22:53:55 +0800 |
| commit | 8b5cb1cbf33292372933e727805e68b506852234 (patch) | |
| tree | 7fd867e455d430dc775292c7b912284e1d21d457 | |
| parent | ec9fee79d48f2f05cb1b95dc901071aa3670f228 (diff) | |
| download | xfs-linux-8b5cb1cbf33292372933e727805e68b506852234.tar.gz | |
LoongArch: mm: Add page table mapped mode support for virt_to_page()
According to LoongArch documentations, there are two types of address
translation modes: direct mapped address translation mode (DMW mode) and
page table mapped address translation mode (TLB mode).
Currently, virt_to_page() only supports direct mapped mode. This patch
determines which mode is used, and adds corresponding handling functions
for both modes.
For more details on the two modes, see [1].
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#virtual-address-space-and-address-translation-mode
Signed-off-by: Enze Li <lienze@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
| -rw-r--r-- | arch/loongarch/include/asm/page.h | 7 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/pgtable.h | 3 | ||||
| -rw-r--r-- | arch/loongarch/mm/pgtable.c | 12 |
3 files changed, 21 insertions, 1 deletions
diff --git a/arch/loongarch/include/asm/page.h b/arch/loongarch/include/asm/page.h index 26e8dccb661909..63f137ce82a41f 100644 --- a/arch/loongarch/include/asm/page.h +++ b/arch/loongarch/include/asm/page.h @@ -84,7 +84,12 @@ typedef struct { unsigned long pgprot; } pgprot_t; #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) #define virt_to_pfn(kaddr) PFN_DOWN(PHYSADDR(kaddr)) -#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) + +#define virt_to_page(kaddr) \ +({ \ + (likely((unsigned long)kaddr < vm_map_base)) ? \ + dmw_virt_to_page((unsigned long)kaddr) : tlb_virt_to_page((unsigned long)kaddr);\ +}) extern int __virt_addr_valid(volatile void *kaddr); #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr)) diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index 7699af049443b4..338d1b14746445 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -353,6 +353,9 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt extern pgd_t swapper_pg_dir[]; extern pgd_t invalid_pg_dir[]; +struct page *dmw_virt_to_page(unsigned long kaddr); +struct page *tlb_virt_to_page(unsigned long kaddr); + /* * The following only work if pte_present() is true. * Undefined behaviour if not.. diff --git a/arch/loongarch/mm/pgtable.c b/arch/loongarch/mm/pgtable.c index 36a6dc0148aef2..48292325182435 100644 --- a/arch/loongarch/mm/pgtable.c +++ b/arch/loongarch/mm/pgtable.c @@ -9,6 +9,18 @@ #include <asm/pgtable.h> #include <asm/tlbflush.h> +struct page *dmw_virt_to_page(unsigned long kaddr) +{ + return pfn_to_page(virt_to_pfn(kaddr)); +} +EXPORT_SYMBOL_GPL(dmw_virt_to_page); + +struct page *tlb_virt_to_page(unsigned long kaddr) +{ + return pfn_to_page(pte_pfn(*virt_to_kpte(kaddr))); +} +EXPORT_SYMBOL_GPL(tlb_virt_to_page); + pgd_t *pgd_alloc(struct mm_struct *mm) { pgd_t *ret, *init; |