Commit 216e04bf authored by Björn Töpel's avatar Björn Töpel Committed by Palmer Dabbelt

riscv: mm: Add support for ZONE_DEVICE

ZONE_DEVICE pages need DEVMAP PTEs support to function
(ARCH_HAS_PTE_DEVMAP). Claim another RSW (reserved for software) bit
in the PTE for DEVMAP mark, add the corresponding helpers, and enable
ARCH_HAS_PTE_DEVMAP for riscv64.
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: default avatarBjörn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20240605114100.315918-11-bjorn@kernel.orgSigned-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 0546d704
......@@ -37,6 +37,7 @@ config RISCV
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PMEM_API
select ARCH_HAS_PREPARE_SYNC_CORE_CMD
select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_DIRECT_MAP if MMU
select ARCH_HAS_SET_MEMORY if MMU
......
......@@ -398,4 +398,24 @@ static inline struct page *pgd_page(pgd_t pgd)
#define p4d_offset p4d_offset
p4d_t *p4d_offset(pgd_t *pgd, unsigned long address);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline int pte_devmap(pte_t pte);
static inline pte_t pmd_pte(pmd_t pmd);
static inline int pmd_devmap(pmd_t pmd)
{
return pte_devmap(pmd_pte(pmd));
}
static inline int pud_devmap(pud_t pud)
{
return 0;
}
static inline int pgd_devmap(pgd_t pgd)
{
return 0;
}
#endif
#endif /* _ASM_RISCV_PGTABLE_64_H */
......@@ -19,6 +19,7 @@
#define _PAGE_SOFT (3 << 8) /* Reserved for software */
#define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */
#define _PAGE_DEVMAP (1 << 9) /* RSW, devmap */
#define _PAGE_TABLE _PAGE_PRESENT
/*
......
......@@ -390,6 +390,13 @@ static inline int pte_special(pte_t pte)
return pte_val(pte) & _PAGE_SPECIAL;
}
#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
static inline int pte_devmap(pte_t pte)
{
return pte_val(pte) & _PAGE_DEVMAP;
}
#endif
/* static inline pte_t pte_rdprotect(pte_t pte) */
static inline pte_t pte_wrprotect(pte_t pte)
......@@ -431,6 +438,11 @@ static inline pte_t pte_mkspecial(pte_t pte)
return __pte(pte_val(pte) | _PAGE_SPECIAL);
}
static inline pte_t pte_mkdevmap(pte_t pte)
{
return __pte(pte_val(pte) | _PAGE_DEVMAP);
}
static inline pte_t pte_mkhuge(pte_t pte)
{
return pte;
......@@ -721,6 +733,11 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
return pte_pmd(pte_mkdirty(pmd_pte(pmd)));
}
static inline pmd_t pmd_mkdevmap(pmd_t pmd)
{
return pte_pmd(pte_mkdevmap(pmd_pte(pmd)));
}
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
......
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