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LoongArch: mm: Add page table mapped mode support for virt_to_page()

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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>
This commit is contained in:
Enze Li 2023-09-06 22:53:55 +08:00 committed by Huacai Chen
parent ec9fee79d4
commit 8b5cb1cbf3
3 changed files with 21 additions and 1 deletions
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7
arch/loongarch/include/asm/page.h
View File

@ -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))

3
arch/loongarch/include/asm/pgtable.h
View File

@ -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..

12
arch/loongarch/mm/pgtable.c
View File

@ -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;