Hi, Ren,
On Mon, Aug 16, 2021 at 9:57 AM Guo Ren <guoren@xxxxxxxxxx> wrote:
>
> .
>
> On Tue, Jul 6, 2021 at 12:19 PM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote:
> >
> > This patch adds memory management support for LoongArch, including:
> > cache and tlb management, page fault handling and ioremap/mmap support.
> >
> > Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > ---
> > arch/loongarch/include/asm/cache.h | 15 +
> > arch/loongarch/include/asm/cacheflush.h | 79 ++++
> > arch/loongarch/include/asm/cacheops.h | 32 ++
> > arch/loongarch/include/asm/fixmap.h | 15 +
> > arch/loongarch/include/asm/hugetlb.h | 79 ++++
> > arch/loongarch/include/asm/kmalloc.h | 10 +
> > arch/loongarch/include/asm/shmparam.h | 12 +
> > arch/loongarch/include/asm/sparsemem.h | 21 ++
> > arch/loongarch/include/asm/tlb.h | 216 +++++++++++
> > arch/loongarch/include/asm/tlbflush.h | 36 ++
> > arch/loongarch/include/asm/vmalloc.h | 4 +
> > arch/loongarch/mm/cache.c | 194 ++++++++++
> > arch/loongarch/mm/extable.c | 22 ++
> > arch/loongarch/mm/fault.c | 289 +++++++++++++++
> > arch/loongarch/mm/hugetlbpage.c | 87 +++++
> > arch/loongarch/mm/init.c | 199 ++++++++++
> > arch/loongarch/mm/ioremap.c | 27 ++
> > arch/loongarch/mm/maccess.c | 10 +
> > arch/loongarch/mm/mmap.c | 204 ++++++++++
> > arch/loongarch/mm/page.S | 93 +++++
> > arch/loongarch/mm/pgtable-64.c | 116 ++++++
> > arch/loongarch/mm/pgtable.c | 24 ++
> > arch/loongarch/mm/tlb.c | 278 ++++++++++++++
> > arch/loongarch/mm/tlbex.S | 473 ++++++++++++++++++++++++
> > 24 files changed, 2535 insertions(+)
> > create mode 100644 arch/loongarch/include/asm/cache.h
> > create mode 100644 arch/loongarch/include/asm/cacheflush.h
> > create mode 100644 arch/loongarch/include/asm/cacheops.h
> > create mode 100644 arch/loongarch/include/asm/fixmap.h
> > create mode 100644 arch/loongarch/include/asm/hugetlb.h
> > create mode 100644 arch/loongarch/include/asm/kmalloc.h
> > create mode 100644 arch/loongarch/include/asm/shmparam.h
> > create mode 100644 arch/loongarch/include/asm/sparsemem.h
> > create mode 100644 arch/loongarch/include/asm/tlb.h
> > create mode 100644 arch/loongarch/include/asm/tlbflush.h
> > create mode 100644 arch/loongarch/include/asm/vmalloc.h
> > create mode 100644 arch/loongarch/mm/cache.c
> > create mode 100644 arch/loongarch/mm/extable.c
> > create mode 100644 arch/loongarch/mm/fault.c
> > create mode 100644 arch/loongarch/mm/hugetlbpage.c
> > create mode 100644 arch/loongarch/mm/init.c
> > create mode 100644 arch/loongarch/mm/ioremap.c
> > create mode 100644 arch/loongarch/mm/maccess.c
> > create mode 100644 arch/loongarch/mm/mmap.c
> > create mode 100644 arch/loongarch/mm/page.S
> > create mode 100644 arch/loongarch/mm/pgtable-64.c
> > create mode 100644 arch/loongarch/mm/pgtable.c
> > create mode 100644 arch/loongarch/mm/tlb.c
> > create mode 100644 arch/loongarch/mm/tlbex.S
> >
> > diff --git a/arch/loongarch/include/asm/cache.h b/arch/loongarch/include/asm/cache.h
> > new file mode 100644
> > index 000000000000..641b2a0090e8
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/cache.h
> > @@ -0,0 +1,15 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_CACHE_H
> > +#define _ASM_CACHE_H
> > +
> > +#include <asm/kmalloc.h>
> > +
> > +#define L1_CACHE_SHIFT CONFIG_L1_CACHE_SHIFT
> > +#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
> > +
> > +#define __read_mostly __section(".data..read_mostly")
> > +
> > +#endif /* _ASM_CACHE_H */
> > diff --git a/arch/loongarch/include/asm/cacheflush.h b/arch/loongarch/include/asm/cacheflush.h
> > new file mode 100644
> > index 000000000000..214ec714a27b
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/cacheflush.h
> > @@ -0,0 +1,79 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_CACHEFLUSH_H
> > +#define _ASM_CACHEFLUSH_H
> > +
> > +#include <linux/mm.h>
> > +#include <asm/cpu-features.h>
> > +#include <asm/cacheops.h>
> > +
> > +/*
> > + * This flag is used to indicate that the page pointed to by a pte
> > + * is dirty and requires cleaning before returning it to the user.
> > + */
> > +#define PG_dcache_dirty PG_arch_1
> > +
> > +#define Page_dcache_dirty(page) \
> > + test_bit(PG_dcache_dirty, &(page)->flags)
> > +#define SetPageDcacheDirty(page) \
> > + set_bit(PG_dcache_dirty, &(page)->flags)
> > +#define ClearPageDcacheDirty(page) \
> > + clear_bit(PG_dcache_dirty, &(page)->flags)
> > +
> > +extern void local_flush_icache_range(unsigned long start, unsigned long end);
> > +
> > +#define flush_icache_range local_flush_icache_range
> > +#define flush_icache_user_range local_flush_icache_range
> > +
> > +extern void copy_to_user_page(struct vm_area_struct *vma,
> > + struct page *page, unsigned long vaddr, void *dst, const void *src,
> > + unsigned long len);
> > +
> > +extern void copy_from_user_page(struct vm_area_struct *vma,
> > + struct page *page, unsigned long vaddr, void *dst, const void *src,
> > + unsigned long len);
> > +
> > +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
> > +
> > +#define flush_cache_all() do { } while (0)
> > +#define flush_cache_mm(mm) do { } while (0)
> > +#define flush_cache_dup_mm(mm) do { } while (0)
> > +#define flush_cache_range(vma, start, end) do { } while (0)
> > +#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
> > +#define flush_cache_vmap(start, end) do { } while (0)
> > +#define flush_cache_vunmap(start, end) do { } while (0)
> > +#define flush_icache_page(vma, page) do { } while (0)
> > +#define flush_icache_user_page(vma, page, addr, len) do { } while (0)
> > +#define flush_dcache_page(page) do { } while (0)
> > +#define flush_dcache_mmap_lock(mapping) do { } while (0)
> > +#define flush_dcache_mmap_unlock(mapping) do { } while (0)
> > +
> > +#define cache_op(op, addr) \
> > + __asm__ __volatile__( \
> > + " cacop %0, %1 \n" \
> > + : \
> > + : "i" (op), "R" (*(unsigned char *)(addr)))
> > +
> > +static inline void flush_icache_line_indexed(unsigned long addr)
> > +{
> > + cache_op(Index_Invalidate_I, addr);
> > +}
> > +
> > +static inline void flush_dcache_line_indexed(unsigned long addr)
> > +{
> > + cache_op(Index_Writeback_Inv_D, addr);
> > +}
> > +
> > +static inline void flush_icache_line(unsigned long addr)
> > +{
> > + cache_op(Hit_Invalidate_I, addr);
> > +}
> > +
> > +static inline void flush_dcache_line(unsigned long addr)
> > +{
> > + cache_op(Hit_Writeback_Inv_D, addr);
> > +}
> > +
> > +#endif /* _ASM_CACHEFLUSH_H */
> > diff --git a/arch/loongarch/include/asm/cacheops.h b/arch/loongarch/include/asm/cacheops.h
> > new file mode 100644
> > index 000000000000..470354b92d0d
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/cacheops.h
> > @@ -0,0 +1,32 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Cache operations for the cache instruction.
> > + *
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef __ASM_CACHEOPS_H
> > +#define __ASM_CACHEOPS_H
> > +
> > +/*
> > + * Most cache ops are split into a 2 bit field identifying the cache, and a 3
> > + * bit field identifying the cache operation.
> > + */
> > +#define CacheOp_Cache 0x03
> > +#define CacheOp_Op 0x1c
> > +
> > +#define Cache_I 0x00
> > +#define Cache_D 0x01
> > +#define Cache_V 0x02
> > +#define Cache_S 0x03
> > +
> > +#define Index_Invalidate 0x08
> > +#define Index_Writeback_Inv 0x08
> > +#define Hit_Invalidate 0x10
> > +#define Hit_Writeback_Inv 0x10
> > +
> > +#define Index_Invalidate_I (Cache_I | Index_Invalidate)
> > +#define Index_Writeback_Inv_D (Cache_D | Index_Writeback_Inv)
> > +#define Hit_Invalidate_I (Cache_I | Hit_Invalidate)
> > +#define Hit_Writeback_Inv_D (Cache_D | Hit_Writeback_Inv)
> > +
> > +#endif /* __ASM_CACHEOPS_H */
> > diff --git a/arch/loongarch/include/asm/fixmap.h b/arch/loongarch/include/asm/fixmap.h
> > new file mode 100644
> > index 000000000000..2ba4df6ec88d
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/fixmap.h
> > @@ -0,0 +1,15 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * fixmap.h: compile-time virtual memory allocation
> > + *
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +
> > +#ifndef _ASM_FIXMAP_H
> > +#define _ASM_FIXMAP_H
> > +
> > +#include <asm/page.h>
> > +
> > +#define NR_FIX_BTMAPS 64
> > +
> > +#endif
> > diff --git a/arch/loongarch/include/asm/hugetlb.h b/arch/loongarch/include/asm/hugetlb.h
> > new file mode 100644
> > index 000000000000..5548ab8ceac2
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/hugetlb.h
> > @@ -0,0 +1,79 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +
> > +#ifndef __ASM_HUGETLB_H
> > +#define __ASM_HUGETLB_H
> > +
> > +#include <asm/page.h>
> > +
> > +uint64_t pmd_to_entrylo(unsigned long pmd_val);
> > +
> > +#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
> > +static inline int prepare_hugepage_range(struct file *file,
> > + unsigned long addr,
> > + unsigned long len)
> > +{
> > + unsigned long task_size = STACK_TOP;
> > + struct hstate *h = hstate_file(file);
> > +
> > + if (len & ~huge_page_mask(h))
> > + return -EINVAL;
> > + if (addr & ~huge_page_mask(h))
> > + return -EINVAL;
> > + if (len > task_size)
> > + return -ENOMEM;
> > + if (task_size - len < addr)
> > + return -EINVAL;
> > + return 0;
> > +}
> > +
> > +#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
> > +static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
> > + unsigned long addr, pte_t *ptep)
> > +{
> > + pte_t clear;
> > + pte_t pte = *ptep;
> > +
> > + pte_val(clear) = (unsigned long)invalid_pte_table;
> > + set_pte_at(mm, addr, ptep, clear);
> > + return pte;
> > +}
> > +
> > +#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
> > +static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
> > + unsigned long addr, pte_t *ptep)
> > +{
> > + flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
> > +}
> > +
> > +#define __HAVE_ARCH_HUGE_PTE_NONE
> > +static inline int huge_pte_none(pte_t pte)
> > +{
> > + unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
> > + return !val || (val == (unsigned long)invalid_pte_table);
> > +}
> > +
> > +#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
> > +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_pte_at(vma->vm_mm, addr, ptep, pte);
> > + /*
> > + * There could be some standard sized pages in there,
> > + * get them all.
> > + */
> > + flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
> > + }
> > + return changed;
> > +}
> > +
> > +#include <asm-generic/hugetlb.h>
> > +
> > +#endif /* __ASM_HUGETLB_H */
> > diff --git a/arch/loongarch/include/asm/kmalloc.h b/arch/loongarch/include/asm/kmalloc.h
> > new file mode 100644
> > index 000000000000..b318c41520d8
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/kmalloc.h
> > @@ -0,0 +1,10 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef __ASM_KMALLOC_H
> > +#define __ASM_KMALLOC_H
> > +
> > +#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
> > +
> > +#endif /* __ASM_KMALLOC_H */
> > diff --git a/arch/loongarch/include/asm/shmparam.h b/arch/loongarch/include/asm/shmparam.h
> > new file mode 100644
> > index 000000000000..f726ac537710
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/shmparam.h
> > @@ -0,0 +1,12 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_SHMPARAM_H
> > +#define _ASM_SHMPARAM_H
> > +
> > +#define __ARCH_FORCE_SHMLBA 1
> > +
> > +#define SHMLBA (4 * PAGE_SIZE) /* attach addr a multiple of this */
> > +
> > +#endif /* _ASM_SHMPARAM_H */
> > diff --git a/arch/loongarch/include/asm/sparsemem.h b/arch/loongarch/include/asm/sparsemem.h
> > new file mode 100644
> > index 000000000000..9b57dc69f523
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/sparsemem.h
> > @@ -0,0 +1,21 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +#ifndef _LOONGARCH_SPARSEMEM_H
> > +#define _LOONGARCH_SPARSEMEM_H
> > +
> > +#ifdef CONFIG_SPARSEMEM
> > +
> > +/*
> > + * SECTION_SIZE_BITS 2^N: how big each section will be
> > + * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
> > + */
> > +#define SECTION_SIZE_BITS 29
> > +#define MAX_PHYSMEM_BITS 48
> > +
> > +#endif /* CONFIG_SPARSEMEM */
> > +
> > +#ifdef CONFIG_MEMORY_HOTPLUG
> > +int memory_add_physaddr_to_nid(u64 addr);
> > +#define memory_add_physaddr_to_nid memory_add_physaddr_to_nid
> > +#endif
> > +
> > +#endif /* _LOONGARCH_SPARSEMEM_H */
> > diff --git a/arch/loongarch/include/asm/tlb.h b/arch/loongarch/include/asm/tlb.h
> > new file mode 100644
> > index 000000000000..7a1745ea404d
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/tlb.h
> > @@ -0,0 +1,216 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef __ASM_TLB_H
> > +#define __ASM_TLB_H
> > +
> > +#include <linux/mm_types.h>
> > +#include <asm/cpu-features.h>
> > +#include <asm/loongarchregs.h>
> > +
> > +/*
> > + * TLB Invalidate Flush
> > + */
> > +static inline void tlbclr(void)
> > +{
> > + __asm__ __volatile__("tlbclr");
> > +}
> > +
> > +static inline void tlbflush(void)
> > +{
> > + __asm__ __volatile__("tlbflush");
> > +}
> > +
> > +/*
> > + * TLB R/W operations.
> > + */
> > +static inline void tlb_probe(void)
> > +{
> > + __asm__ __volatile__("tlbsrch");
> > +}
> > +
> > +static inline void tlb_read(void)
> > +{
> > + __asm__ __volatile__("tlbrd");
> > +}
> > +
> > +static inline void tlb_write_indexed(void)
> > +{
> > + __asm__ __volatile__("tlbwr");
> > +}
> > +
> > +static inline void tlb_write_random(void)
> > +{
> > + __asm__ __volatile__("tlbfill");
> > +}
> > +
> > +/*
> > + * Guest TLB Invalidate Flush
> > + */
> > +static inline void guest_tlbflush(void)
> > +{
> > + __asm__ __volatile__(
> > + ".word 0x6482401\n\t");
> > +}
> > +
> > +/*
> > + * Guest TLB R/W operations.
> > + */
> > +static inline void guest_tlb_probe(void)
> > +{
> > + __asm__ __volatile__(
> > + ".word 0x6482801\n\t");
> > +}
> > +
> > +static inline void guest_tlb_read(void)
> > +{
> > + __asm__ __volatile__(
> > + ".word 0x6482c01\n\t");
> > +}
> > +
> > +static inline void guest_tlb_write_indexed(void)
> > +{
> > + __asm__ __volatile__(
> > + ".word 0x6483001\n\t");
> > +}
> > +
> > +static inline void guest_tlb_write_random(void)
> > +{
> > + __asm__ __volatile__(
> > + ".word 0x6483401\n\t");
> > +}
> All opcodes need comments and macro defined properly in headers. I
> guess these are for MIPS assembler.
>
> > +
> > +enum invtlb_ops {
> > + /* Invalid all tlb */
> > + INVTLB_ALL = 0x0,
> > + /* Invalid current tlb */
> > + INVTLB_CURRENT_ALL = 0x1,
> > + /* Invalid all global=1 lines in current tlb */
> > + INVTLB_CURRENT_GTRUE = 0x2,
> > + /* Invalid all global=0 lines in current tlb */
> > + INVTLB_CURRENT_GFALSE = 0x3,
> > + /* Invalid global=0 and matched asid lines in current tlb */
> > + INVTLB_GFALSE_AND_ASID = 0x4,
> > + /* Invalid addr with global=0 and matched asid in current tlb */
> > + INVTLB_ADDR_GFALSE_AND_ASID = 0x5,
> > + /* Invalid addr with global=1 or matched asid in current tlb */
> > + INVTLB_ADDR_GTRUE_OR_ASID = 0x6,
> > + /* Invalid matched gid in guest tlb */
> > + INVGTLB_GID = 0x9,
> > + /* Invalid global=1, matched gid in guest tlb */
> > + INVGTLB_GID_GTRUE = 0xa,
> > + /* Invalid global=0, matched gid in guest tlb */
> > + INVGTLB_GID_GFALSE = 0xb,
> > + /* Invalid global=0, matched gid and asid in guest tlb */
> > + INVGTLB_GID_GFALSE_ASID = 0xc,
> > + /* Invalid global=0 , matched gid, asid and addr in guest tlb */
> > + INVGTLB_GID_GFALSE_ASID_ADDR = 0xd,
> > + /* Invalid global=1 , matched gid, asid and addr in guest tlb */
> > + INVGTLB_GID_GTRUE_ASID_ADDR = 0xe,
> > + /* Invalid all gid gva-->gpa guest tlb */
> > + INVGTLB_ALLGID_GVA_TO_GPA = 0x10,
> > + /* Invalid all gid gpa-->hpa tlb */
> > + INVTLB_ALLGID_GPA_TO_HPA = 0x11,
> > + /* Invalid all gid tlb, including gva-->gpa and gpa-->hpa */
> > + INVTLB_ALLGID = 0x12,
> > + /* Invalid matched gid gva-->gpa guest tlb */
> > + INVGTLB_GID_GVA_TO_GPA = 0x13,
> > + /* Invalid matched gid gpa-->hpa tlb */
> > + INVTLB_GID_GPA_TO_HPA = 0x14,
> > + /* Invalid matched gid tlb,including gva-->gpa and gpa-->hpa */
> > + INVTLB_GID_ALL = 0x15,
> > + /* Invalid matched gid and addr gpa-->hpa tlb */
> > + INVTLB_GID_ADDR = 0x16,
> > +};
> > +
> > +/*
> > + * invtlb op info addr
> > + * (0x1 << 26) | (0x24 << 20) | (0x13 << 15) |
> > + * (addr << 10) | (info << 5) | op
> > + */
> > +static inline void invtlb(u32 op, u32 info, u64 addr)
> > +{
> > + __asm__ __volatile__(
> > + "parse_r addr,%0\n\t"
> > + "parse_r info,%1\n\t"
> > + ".word ((0x6498000) | (addr << 10) | (info << 5) | %2)\n\t"
> > + :
> > + : "r"(addr), "r"(info), "i"(op)
> > + :
> > + );
> > +}
> > +
> > +static inline void invtlb_addr(u32 op, u32 info, u64 addr)
> > +{
> > + __asm__ __volatile__(
> > + "parse_r addr,%0\n\t"
> > + ".word ((0x6498000) | (addr << 10) | (0 << 5) | %1)\n\t"
> > + :
> > + : "r"(addr), "i"(op)
> > + :
> > + );
> > +}
> > +
> > +static inline void invtlb_info(u32 op, u32 info, u64 addr)
> > +{
> > + __asm__ __volatile__(
> > + "parse_r info,%0\n\t"
> > + ".word ((0x6498000) | (0 << 10) | (info << 5) | %1)\n\t"
> > + :
> > + : "r"(info), "i"(op)
> > + :
> > + );
> > +}
> > +
> > +static inline void invtlb_all(u32 op, u32 info, u64 addr)
> > +{
> > + __asm__ __volatile__(
> > + ".word ((0x6498000) | (0 << 10) | (0 << 5) | %0)\n\t"
> > + :
> > + : "i"(op)
> > + :
> > + );
> > +}
> Ditto
>
> > +
> > +/*
> > + * LoongArch doesn't need any special per-pte or per-vma handling, except
> > + * we need to flush cache for area to be unmapped.
> > + */
> > +#define tlb_start_vma(tlb, vma) \
> > + do { \
> > + if (!(tlb)->fullmm) \
> > + flush_cache_range(vma, vma->vm_start, vma->vm_end); \
> > + } while (0)
> > +#define tlb_end_vma(tlb, vma) do { } while (0)
> > +#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
> > +
> > +static void tlb_flush(struct mmu_gather *tlb);
> > +
> > +#define tlb_flush tlb_flush
> > +#include <asm-generic/tlb.h>
> > +
> > +static inline void tlb_flush(struct mmu_gather *tlb)
> > +{
> > + struct vm_area_struct vma;
> > +
> > + vma.vm_mm = tlb->mm;
> > + vma.vm_flags = 0;
> > + if (tlb->fullmm) {
> > + flush_tlb_mm(tlb->mm);
> > + return;
> > + }
> > +
> > + flush_tlb_range(&vma, tlb->start, tlb->end);
> > +}
> > +
> > +extern void handle_tlb_load(void);
> > +extern void handle_tlb_store(void);
> > +extern void handle_tlb_modify(void);
> > +extern void handle_tlb_refill(void);
> > +extern void handle_tlb_rixi(void);
> > +
> > +extern void dump_tlb_all(void);
> > +extern void dump_tlb_regs(void);
> > +
> > +#endif /* __ASM_TLB_H */
> > diff --git a/arch/loongarch/include/asm/tlbflush.h b/arch/loongarch/include/asm/tlbflush.h
> > new file mode 100644
> > index 000000000000..a5672367d966
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/tlbflush.h
> > @@ -0,0 +1,36 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#ifndef __ASM_TLBFLUSH_H
> > +#define __ASM_TLBFLUSH_H
> > +
> > +#include <linux/mm.h>
> > +
> > +/*
> > + * TLB flushing:
> > + *
> > + * - flush_tlb_all() flushes all processes TLB entries
> > + * - flush_tlb_mm(mm) flushes the specified mm context TLB entries
> > + * - flush_tlb_page(vma, vmaddr) flushes one page
> > + * - flush_tlb_range(vma, start, end) flushes a range of pages
> > + * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
> > + */
> > +extern void local_flush_tlb_all(void);
> > +extern void local_flush_tlb_mm(struct mm_struct *mm);
> > +extern void local_flush_tlb_range(struct vm_area_struct *vma,
> > + unsigned long start, unsigned long end);
> > +extern void local_flush_tlb_kernel_range(unsigned long start,
> > + unsigned long end);
> > +extern void local_flush_tlb_page(struct vm_area_struct *vma,
> > + unsigned long page);
> > +extern void local_flush_tlb_one(unsigned long vaddr);
> > +
> > +#define flush_tlb_all() local_flush_tlb_all()
> > +#define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
> > +#define flush_tlb_range(vma, vmaddr, end) local_flush_tlb_range(vma, vmaddr, end)
> > +#define flush_tlb_kernel_range(vmaddr, end) local_flush_tlb_kernel_range(vmaddr, end)
> > +#define flush_tlb_page(vma, page) local_flush_tlb_page(vma, page)
> > +#define flush_tlb_one(vaddr) local_flush_tlb_one(vaddr)
> > +
> > +#endif /* __ASM_TLBFLUSH_H */
> > diff --git a/arch/loongarch/include/asm/vmalloc.h b/arch/loongarch/include/asm/vmalloc.h
> > new file mode 100644
> > index 000000000000..965a0d41ac2d
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/vmalloc.h
> > @@ -0,0 +1,4 @@
> > +#ifndef _ASM_LOONGARCH_VMALLOC_H
> > +#define _ASM_LOONGARCH_VMALLOC_H
> > +
> > +#endif /* _ASM_LOONGARCH_VMALLOC_H */
> > diff --git a/arch/loongarch/mm/cache.c b/arch/loongarch/mm/cache.c
> > new file mode 100644
> > index 000000000000..945087a88d03
> > --- /dev/null
> > +++ b/arch/loongarch/mm/cache.c
> > @@ -0,0 +1,194 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/export.h>
> > +#include <linux/fcntl.h>
> > +#include <linux/fs.h>
> > +#include <linux/highmem.h>
> > +#include <linux/kernel.h>
> > +#include <linux/linkage.h>
> > +#include <linux/mm.h>
> > +#include <linux/sched.h>
> > +#include <linux/syscalls.h>
> > +
> > +#include <asm/cacheflush.h>
> > +#include <asm/cpu.h>
> > +#include <asm/cpu-features.h>
> > +#include <asm/dma.h>
> > +#include <asm/loongarchregs.h>
> > +#include <asm/processor.h>
> > +#include <asm/setup.h>
> > +
> > +/* Cache operations. */
> > +void local_flush_icache_range(unsigned long start, unsigned long end)
> > +{
> > + asm volatile ("\tibar 0\n"::);
> > +}
> Would loongarch support any broadcast icache invalid instructions in SMP?
LoongArch doesn't need broadcast instruction, because LoongArch
maintains ICache/DCache coherency by hardware, we just need "ibar" to
avoid instruction hazard here.
>
> > +
> > +void __update_cache(unsigned long address, pte_t pte)
> > +{
> > + struct page *page;
> > + unsigned long pfn, addr;
> > +
> > + pfn = pte_pfn(pte);
> > + if (unlikely(!pfn_valid(pfn)))
> > + return;
> > + page = pfn_to_page(pfn);
> > + if (Page_dcache_dirty(page)) {
> > + if (PageHighMem(page))
> > + addr = (unsigned long)kmap_atomic(page);
> > + else
> > + addr = (unsigned long)page_address(page);
> nothing here?
> > +
> > + if (PageHighMem(page))
> > + kunmap_atomic((void *)addr);
> Why need above codes?
HighMem code will be removed, until 32bit support becomes available.
>
> > +
> > + ClearPageDcacheDirty(page);
> > + }
> > +}
> > +
> > +static inline void setup_protection_map(void)
> > +{
> > + protection_map[0] = __pgprot(_CACHE_CC |
> > + _PAGE_PROTNONE | _PAGE_NO_EXEC | _PAGE_NO_READ);
> > + protection_map[1] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC);
> > + protection_map[2] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
> > + protection_map[3] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC);
> > + protection_map[4] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT);
> > + protection_map[5] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT);
> > + protection_map[6] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT);
> > + protection_map[7] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT);
> > +
> > + protection_map[8] = __pgprot(_CACHE_CC |
> > + _PAGE_PROTNONE | _PAGE_NO_EXEC | _PAGE_NO_READ);
> > + protection_map[9] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC);
> > + protection_map[10] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
> > + protection_map[11] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
> > + protection_map[12] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT);
> > + protection_map[13] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT);
> > + protection_map[14] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_WRITE);
> > + protection_map[15] = __pgprot(_CACHE_CC |
> > + _PAGE_USER | _PAGE_PRESENT | _PAGE_WRITE);
> > +}
> > +
> > +void cache_error_setup(void)
> > +{
> > + extern char __weak except_vec_cex;
> > + set_merr_handler(0x0, &except_vec_cex, 0x80);
> > +}
> > +
> > +static unsigned long icache_size __read_mostly;
> > +static unsigned long dcache_size __read_mostly;
> > +static unsigned long vcache_size __read_mostly;
> > +static unsigned long scache_size __read_mostly;
> > +
> > +static char *way_string[] = { NULL, "direct mapped", "2-way",
> > + "3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
> > + "9-way", "10-way", "11-way", "12-way",
> > + "13-way", "14-way", "15-way", "16-way",
> > +};
> > +
> > +static void probe_pcache(void)
> > +{
> > + struct cpuinfo_loongarch *c = ¤t_cpu_data;
> > + unsigned int lsize, sets, ways;
> > + unsigned int config;
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG17);
> > + lsize = 1 << ((config & CPUCFG17_L1I_SIZE_M) >> CPUCFG17_L1I_SIZE);
> > + sets = 1 << ((config & CPUCFG17_L1I_SETS_M) >> CPUCFG17_L1I_SETS);
> > + ways = ((config & CPUCFG17_L1I_WAYS_M) >> CPUCFG17_L1I_WAYS) + 1;
> > +
> > + c->icache.linesz = lsize;
> > + c->icache.sets = sets;
> > + c->icache.ways = ways;
> > + icache_size = sets * ways * lsize;
> > + c->icache.waysize = icache_size / c->icache.ways;
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG18);
> > + lsize = 1 << ((config & CPUCFG18_L1D_SIZE_M) >> CPUCFG18_L1D_SIZE);
> > + sets = 1 << ((config & CPUCFG18_L1D_SETS_M) >> CPUCFG18_L1D_SETS);
> > + ways = ((config & CPUCFG18_L1D_WAYS_M) >> CPUCFG18_L1D_WAYS) + 1;
> > +
> > + c->dcache.linesz = lsize;
> > + c->dcache.sets = sets;
> > + c->dcache.ways = ways;
> > + dcache_size = sets * ways * lsize;
> > + c->dcache.waysize = dcache_size / c->dcache.ways;
> > +
> > + c->options |= LOONGARCH_CPU_PREFETCH;
> > +
> > + pr_info("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
> > + icache_size >> 10, way_string[c->icache.ways], "VIPT", c->icache.linesz);
> > +
> > + pr_info("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
> > + dcache_size >> 10, way_string[c->dcache.ways], "VIPT", "no aliases", c->dcache.linesz);
> > +}
> > +
> > +static void probe_vcache(void)
> > +{
> > + struct cpuinfo_loongarch *c = ¤t_cpu_data;
> > + unsigned int lsize, sets, ways;
> > + unsigned int config;
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG19);
> > + lsize = 1 << ((config & CPUCFG19_L2_SIZE_M) >> CPUCFG19_L2_SIZE);
> > + sets = 1 << ((config & CPUCFG19_L2_SETS_M) >> CPUCFG19_L2_SETS);
> > + ways = ((config & CPUCFG19_L2_WAYS_M) >> CPUCFG19_L2_WAYS) + 1;
> > +
> > + c->vcache.linesz = lsize;
> > + c->vcache.sets = sets;
> > + c->vcache.ways = ways;
> > + vcache_size = lsize * sets * ways;
> > + c->vcache.waysize = vcache_size / c->vcache.ways;
> > +
> > + pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
> > + vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz);
> > +}
> > +
> > +static void probe_scache(void)
> > +{
> > + struct cpuinfo_loongarch *c = ¤t_cpu_data;
> > + unsigned int lsize, sets, ways;
> > + unsigned int config;
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG20);
> > + lsize = 1 << ((config & CPUCFG20_L3_SIZE_M) >> CPUCFG20_L3_SIZE);
> > + sets = 1 << ((config & CPUCFG20_L3_SETS_M) >> CPUCFG20_L3_SETS);
> > + ways = ((config & CPUCFG20_L3_WAYS_M) >> CPUCFG20_L3_WAYS) + 1;
> > +
> > + c->scache.linesz = lsize;
> > + c->scache.sets = sets;
> > + c->scache.ways = ways;
> > + /* 4 cores. scaches are shared */
> > + scache_size = lsize * sets * ways;
> > + c->scache.waysize = scache_size / c->scache.ways;
> > +
> > + pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
> > + scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
> > +}
> > +
> > +void cpu_cache_init(void)
> > +{
> > + probe_pcache();
> > + probe_vcache();
> > + probe_scache();
> > +
> > + shm_align_mask = PAGE_SIZE - 1;
> > +
> > + setup_protection_map();
> > +}
> > diff --git a/arch/loongarch/mm/extable.c b/arch/loongarch/mm/extable.c
> > new file mode 100644
> > index 000000000000..7b367a8dd7e0
> > --- /dev/null
> > +++ b/arch/loongarch/mm/extable.c
> > @@ -0,0 +1,22 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/extable.h>
> > +#include <linux/spinlock.h>
> > +#include <asm/branch.h>
> > +#include <linux/uaccess.h>
> > +
> > +int fixup_exception(struct pt_regs *regs)
> > +{
> > + const struct exception_table_entry *fixup;
> > +
> > + fixup = search_exception_tables(exception_epc(regs));
> > + if (fixup) {
> > + regs->csr_epc = fixup->fixup;
> > +
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c
> > new file mode 100644
> > index 000000000000..f3a523379993
> > --- /dev/null
> > +++ b/arch/loongarch/mm/fault.c
> > @@ -0,0 +1,289 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/context_tracking.h>
> > +#include <linux/signal.h>
> > +#include <linux/sched.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/kernel.h>
> > +#include <linux/errno.h>
> > +#include <linux/string.h>
> > +#include <linux/types.h>
> > +#include <linux/ptrace.h>
> > +#include <linux/ratelimit.h>
> > +#include <linux/mman.h>
> > +#include <linux/mm.h>
> > +#include <linux/smp.h>
> > +#include <linux/kdebug.h>
> > +#include <linux/kprobes.h>
> > +#include <linux/perf_event.h>
> > +#include <linux/uaccess.h>
> > +
> > +#include <asm/branch.h>
> > +#include <asm/mmu_context.h>
> > +#include <asm/ptrace.h>
> > +
> > +int show_unhandled_signals = 1;
> > +
> > +/*
> > + * This routine handles page faults. It determines the address,
> > + * and the problem, and then passes it off to one of the appropriate
> > + * routines.
> > + */
> > +static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
> > + unsigned long address)
> > +{
> > + int si_code;
> > + const int field = sizeof(unsigned long) * 2;
> > + unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
> > + struct task_struct *tsk = current;
> > + struct mm_struct *mm = tsk->mm;
> > + struct vm_area_struct *vma = NULL;
> > + vm_fault_t fault;
> > +
> > + static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
> > +
> > + si_code = SEGV_MAPERR;
> > +
> > + if (user_mode(regs) && (address & __UA_LIMIT))
> > + goto bad_area_nosemaphore;
> > +
> > + /*
> > + * We fault-in kernel-space virtual memory on-demand. The
> > + * 'reference' page table is init_mm.pgd.
> > + *
> > + * NOTE! We MUST NOT take any locks for this case. We may
> > + * be in an interrupt or a critical region, and should
> > + * only copy the information from the master page table,
> > + * nothing more.
> > + */
> > +#ifdef CONFIG_64BIT
> > +# define VMALLOC_FAULT_TARGET no_context
> > +#else
> > +# define VMALLOC_FAULT_TARGET vmalloc_fault
> > +#endif
> > + if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END))
> > + goto VMALLOC_FAULT_TARGET;
> > +
> > + /* Enable interrupts if they were enabled in the parent context. */
> > + if (likely(regs->csr_prmd & CSR_PRMD_PIE))
> > + local_irq_enable();
> > +
> > + /*
> > + * If we're in an interrupt or have no user
> > + * context, we must not take the fault..
> > + */
> > + if (faulthandler_disabled() || !mm)
> > + goto bad_area_nosemaphore;
> > +
> > + if (user_mode(regs))
> > + flags |= FAULT_FLAG_USER;
> > +retry:
> > + mmap_read_lock(mm);
> > + vma = find_vma(mm, address);
> > + if (!vma)
> > + goto bad_area;
> > + if (vma->vm_start <= address)
> > + goto good_area;
> > + if (!(vma->vm_flags & VM_GROWSDOWN))
> > + goto bad_area;
> > + if (expand_stack(vma, address))
> > + goto bad_area;
> > +/*
> > + * Ok, we have a good vm_area for this memory access, so
> > + * we can handle it..
> > + */
> > +good_area:
> > + si_code = SEGV_ACCERR;
> > +
> > + if (write) {
> > + if (!(vma->vm_flags & VM_WRITE))
> > + goto bad_area;
> > + flags |= FAULT_FLAG_WRITE;
> > + } else {
> > + if (address == regs->csr_epc && !(vma->vm_flags & VM_EXEC))
> > + goto bad_area;
> > + if (!(vma->vm_flags & VM_READ) &&
> > + exception_epc(regs) != address)
> > + goto bad_area;
> > + }
> > +
> > + /*
> > + * If for any reason at all we couldn't handle the fault,
> > + * make sure we exit gracefully rather than endlessly redo
> > + * the fault.
> > + */
> > + fault = handle_mm_fault(vma, address, flags, regs);
> > +
> > + if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
> > + return;
> > +
> > + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
> > + if (unlikely(fault & VM_FAULT_ERROR)) {
> > + if (fault & VM_FAULT_OOM)
> > + goto out_of_memory;
> > + else if (fault & VM_FAULT_SIGSEGV)
> > + goto bad_area;
> > + else if (fault & VM_FAULT_SIGBUS)
> > + goto do_sigbus;
> > + BUG();
> > + }
> > + if (flags & FAULT_FLAG_ALLOW_RETRY) {
> > + if (fault & VM_FAULT_MAJOR) {
> > + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
> > + regs, address);
> > + tsk->maj_flt++;
> > + } else {
> > + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
> > + regs, address);
> > + tsk->min_flt++;
> > + }
> > + if (fault & VM_FAULT_RETRY) {
> > + flags &= ~FAULT_FLAG_ALLOW_RETRY;
> > + flags |= FAULT_FLAG_TRIED;
> > +
> > + /*
> > + * No need to mmap_read_unlock(mm) as we would
> > + * have already released it in __lock_page_or_retry
> > + * in mm/filemap.c.
> > + */
> > +
> > + goto retry;
> > + }
> > + }
> > +
> > + mmap_read_unlock(mm);
> > + return;
> > +
> > +/*
> > + * Something tried to access memory that isn't in our memory map..
> > + * Fix it, but check if it's kernel or user first..
> > + */
> > +bad_area:
> > + mmap_read_unlock(mm);
> > +
> > +bad_area_nosemaphore:
> > + /* User mode accesses just cause a SIGSEGV */
> > + if (user_mode(regs)) {
> > + tsk->thread.csr_badvaddr = address;
> > + tsk->thread.error_code = write;
> > + if (show_unhandled_signals &&
> > + unhandled_signal(tsk, SIGSEGV) &&
> > + __ratelimit(&ratelimit_state)) {
> > + pr_info("do_page_fault(): sending SIGSEGV to %s for invalid %s %0*lx\n",
> > + tsk->comm,
> > + write ? "write access to" : "read access from",
> > + field, address);
> > + pr_info("epc = %0*lx in", field,
> > + (unsigned long) regs->csr_epc);
> > + print_vma_addr(KERN_CONT " ", regs->csr_epc);
> > + pr_cont("\n");
> > + pr_info("ra = %0*lx in", field,
> > + (unsigned long) regs->regs[1]);
> > + print_vma_addr(KERN_CONT " ", regs->regs[1]);
> > + pr_cont("\n");
> > + }
> > + current->thread.trap_nr = read_csr_excode();
> > + force_sig_fault(SIGSEGV, si_code, (void __user *)address);
> > + return;
> > + }
> > +
> > +no_context:
> > + /* Are we prepared to handle this kernel fault? */
> > + if (fixup_exception(regs)) {
> > + current->thread.csr_baduaddr = address;
> > + return;
> > + }
> > +
> > + /*
> > + * Oops. The kernel tried to access some bad page. We'll have to
> > + * terminate things with extreme prejudice.
> > + */
> > + bust_spinlocks(1);
> > +
> > + pr_alert("CPU %d Unable to handle kernel paging request at "
> > + "virtual address %0*lx, epc == %0*lx, ra == %0*lx\n",
> > + raw_smp_processor_id(), field, address, field, regs->csr_epc,
> > + field, regs->regs[1]);
> > + die("Oops", regs);
> > +
> > +out_of_memory:
> > + /*
> > + * We ran out of memory, call the OOM killer, and return the userspace
> > + * (which will retry the fault, or kill us if we got oom-killed).
> > + */
> > + mmap_read_unlock(mm);
> > + if (!user_mode(regs))
> > + goto no_context;
> > + pagefault_out_of_memory();
> > + return;
> > +
> > +do_sigbus:
> > + mmap_read_unlock(mm);
> > +
> > + /* Kernel mode? Handle exceptions or die */
> > + if (!user_mode(regs))
> > + goto no_context;
> > +
> > + /*
> > + * Send a sigbus, regardless of whether we were in kernel
> > + * or user mode.
> > + */
> > + current->thread.trap_nr = read_csr_excode();
> > + tsk->thread.csr_badvaddr = address;
> > + force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
> > +
> > + return;
> > +
> > +#ifndef CONFIG_64BIT
> > +vmalloc_fault:
> > + {
> > + /*
> > + * Synchronize this task's top level page-table
> > + * with the 'reference' page table.
> > + *
> > + * Do _not_ use "tsk" here. We might be inside
> > + * an interrupt in the middle of a task switch..
> > + */
> > + int offset = __pgd_offset(address);
> > + pgd_t *pgd, *pgd_k;
> > + pud_t *pud, *pud_k;
> > + pmd_t *pmd, *pmd_k;
> > + pte_t *pte_k;
> > +
> > + pgd = (pgd_t *) pgd_current[raw_smp_processor_id()] + offset;
> Please using PER_CPU infrastructure. Or using LOONGARCH_CSR_PGDH.
32bit code will be removed.
> > + pgd_k = init_mm.pgd + offset;
> > +
> > + if (!pgd_present(*pgd_k))
> > + goto no_context;
> > + set_pgd(pgd, *pgd_k);
> > +
> > + pud = pud_offset(pgd, address);
> > + pud_k = pud_offset(pgd_k, address);
> > + if (!pud_present(*pud_k))
> > + goto no_context;
> > +
> > + pmd = pmd_offset(pud, address);
> > + pmd_k = pmd_offset(pud_k, address);
> > + if (!pmd_present(*pmd_k))
> > + goto no_context;
> > + set_pmd(pmd, *pmd_k);
> > +
> > + pte_k = pte_offset_kernel(pmd_k, address);
> > + if (!pte_present(*pte_k))
> > + goto no_context;
> > + return;
> > + }
> > +#endif
> > +}
> > +
> > +asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
> > + unsigned long write, unsigned long address)
> > +{
> > + enum ctx_state prev_state;
> > +
> > + prev_state = exception_enter();
> > + __do_page_fault(regs, write, address);
> > + exception_exit(prev_state);
> > +}
> > diff --git a/arch/loongarch/mm/hugetlbpage.c b/arch/loongarch/mm/hugetlbpage.c
> > new file mode 100644
> > index 000000000000..f6f56f5e8a08
> > --- /dev/null
> > +++ b/arch/loongarch/mm/hugetlbpage.c
> > @@ -0,0 +1,87 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <linux/fs.h>
> > +#include <linux/mm.h>
> > +#include <linux/hugetlb.h>
> > +#include <linux/pagemap.h>
> > +#include <linux/err.h>
> > +#include <linux/sysctl.h>
> > +#include <asm/mman.h>
> > +#include <asm/tlb.h>
> > +#include <asm/tlbflush.h>
> > +
> > +pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
> > + unsigned long addr, unsigned long sz)
> > +{
> > + pgd_t *pgd;
> > + p4d_t *p4d;
> > + pud_t *pud;
> > + pte_t *pte = NULL;
> > +
> > + pgd = pgd_offset(mm, addr);
> > + p4d = p4d_alloc(mm, pgd, addr);
> > + pud = pud_alloc(mm, p4d, addr);
> > + if (pud)
> > + pte = (pte_t *)pmd_alloc(mm, pud, addr);
> > +
> > + return pte;
> > +}
> > +
> > +pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
> > + unsigned long sz)
> > +{
> > + pgd_t *pgd;
> > + p4d_t *p4d;
> > + pud_t *pud;
> > + pmd_t *pmd = NULL;
> > +
> > + pgd = pgd_offset(mm, addr);
> > + if (pgd_present(*pgd)) {
> > + p4d = p4d_offset(pgd, addr);
> > + if (p4d_present(*p4d)) {
> > + pud = pud_offset(p4d, addr);
> > + if (pud_present(*pud))
> > + pmd = pmd_offset(pud, addr);
> > + }
> > + }
> > + return (pte_t *) pmd;
> > +}
> > +
> > +/*
> > + * This function checks for proper alignment of input addr and len parameters.
> > + */
> > +int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
> > +{
> > + if (len & ~HPAGE_MASK)
> > + return -EINVAL;
> > + if (addr & ~HPAGE_MASK)
> > + return -EINVAL;
> > + return 0;
> > +}
> > +
> > +int pmd_huge(pmd_t pmd)
> > +{
> > + return (pmd_val(pmd) & _PAGE_HUGE) != 0;
> > +}
> > +
> > +int pud_huge(pud_t pud)
> > +{
> > + return (pud_val(pud) & _PAGE_HUGE) != 0;
> > +}
> > +
> > +uint64_t pmd_to_entrylo(unsigned long pmd_val)
> > +{
> > + uint64_t val;
> > + /* PMD as PTE. Must be huge page */
> > + if (!pmd_huge(__pmd(pmd_val)))
> > + panic("%s", __func__);
> > +
> > + val = pmd_val ^ _PAGE_HUGE;
> > + val |= ((val & _PAGE_HGLOBAL) >>
> > + (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
> > +
> > + return val;
> > +}
> > diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
> > new file mode 100644
> > index 000000000000..e661017ca23e
> > --- /dev/null
> > +++ b/arch/loongarch/mm/init.c
> > @@ -0,0 +1,199 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/bug.h>
> > +#include <linux/init.h>
> > +#include <linux/export.h>
> > +#include <linux/signal.h>
> > +#include <linux/sched.h>
> > +#include <linux/smp.h>
> > +#include <linux/kernel.h>
> > +#include <linux/errno.h>
> > +#include <linux/string.h>
> > +#include <linux/types.h>
> > +#include <linux/pagemap.h>
> > +#include <linux/ptrace.h>
> > +#include <linux/memblock.h>
> > +#include <linux/mm.h>
> > +#include <linux/mman.h>
> > +#include <linux/highmem.h>
> > +#include <linux/swap.h>
> > +#include <linux/proc_fs.h>
> > +#include <linux/pfn.h>
> > +#include <linux/hardirq.h>
> > +#include <linux/gfp.h>
> > +#include <linux/initrd.h>
> > +#include <linux/mmzone.h>
> > +
> > +#include <asm/asm-offsets.h>
> > +#include <asm/bootinfo.h>
> > +#include <asm/cpu.h>
> > +#include <asm/dma.h>
> > +#include <asm/mmu_context.h>
> > +#include <asm/sections.h>
> > +#include <asm/pgtable.h>
> > +#include <asm/pgalloc.h>
> > +#include <asm/tlb.h>
> > +
> > +/*
> > + * We have up to 8 empty zeroed pages so we can map one of the right colour
> > + * when needed. Since page is never written to after the initialization we
> > + * don't have to care about aliases on other CPUs.
> > + */
> > +unsigned long empty_zero_page, zero_page_mask;
> > +EXPORT_SYMBOL_GPL(empty_zero_page);
> > +EXPORT_SYMBOL(zero_page_mask);
> > +
> > +void setup_zero_pages(void)
> > +{
> > + unsigned int order, i;
> > + struct page *page;
> > +
> > + order = 0;
> > +
> > + empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
> > + if (!empty_zero_page)
> > + panic("Oh boy, that early out of memory?");
> > +
> > + page = virt_to_page((void *)empty_zero_page);
> > + split_page(page, order);
> > + for (i = 0; i < (1 << order); i++, page++)
> > + mark_page_reserved(page);
> > +
> > + zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
> > +}
> > +
> > +void copy_user_highpage(struct page *to, struct page *from,
> > + unsigned long vaddr, struct vm_area_struct *vma)
> > +{
> > + void *vfrom, *vto;
> > +
> > + vto = kmap_atomic(to);
> > + vfrom = kmap_atomic(from);
> > + copy_page(vto, vfrom);
> > + kunmap_atomic(vfrom);
> > + kunmap_atomic(vto);
> > + /* Make sure this page is cleared on other CPU's too before using it */
> > + smp_wmb();
> > +}
> > +
> > +void copy_to_user_page(struct vm_area_struct *vma,
> > + struct page *page, unsigned long vaddr, void *dst, const void *src,
> > + unsigned long len)
> > +{
> > + memcpy(dst, src, len);
> > +}
> > +
> > +void copy_from_user_page(struct vm_area_struct *vma,
> > + struct page *page, unsigned long vaddr, void *dst, const void *src,
> > + unsigned long len)
> > +{
> > + memcpy(dst, src, len);
> > +}
> > +EXPORT_SYMBOL_GPL(copy_from_user_page);
> > +
> > +void __init paging_init(void)
> > +{
> > + unsigned long max_zone_pfns[MAX_NR_ZONES];
> > +
> > + pagetable_init();
> > +
> > +#ifdef CONFIG_ZONE_DMA
> > + max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
> > +#endif
> > +#ifdef CONFIG_ZONE_DMA32
> > + max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
> > +#endif
> > + max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
> > +
> > + free_area_init(max_zone_pfns);
> > +}
> > +
> > +void __init mem_init(void)
> > +{
> > + max_mapnr = max_low_pfn;
> > + high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
> > +
> > + memblock_free_all();
> > + setup_zero_pages(); /* Setup zeroed pages. */
> > +}
> > +
> > +void free_init_pages(const char *what, unsigned long begin, unsigned long end)
> > +{
> > + unsigned long pfn;
> > +
> > + for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
> > + struct page *page = pfn_to_page(pfn);
> > + void *addr = phys_to_virt(PFN_PHYS(pfn));
> > +
> > + memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
> > + free_reserved_page(page);
> > + }
> > + pr_info("Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
> > +}
> > +
> > +#ifdef CONFIG_BLK_DEV_INITRD
> > +void free_initrd_mem(unsigned long start, unsigned long end)
> > +{
> > + free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
> > + "initrd");
> > +}
> > +#endif
> > +
> > +void __ref free_initmem(void)
> > +{
> > + free_initmem_default(POISON_FREE_INITMEM);
> > +}
> > +
> > +#ifdef CONFIG_MEMORY_HOTPLUG
> > +int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)
> > +{
> > + unsigned long start_pfn = start >> PAGE_SHIFT;
> > + unsigned long nr_pages = size >> PAGE_SHIFT;
> > + int ret;
> > +
> > + ret = __add_pages(nid, start_pfn, nr_pages, params);
> > +
> > + if (ret)
> > + pr_warn("%s: Problem encountered in __add_pages() as ret=%d\n",
> > + __func__, ret);
> > +
> > + return ret;
> > +}
> > +
> > +#ifdef CONFIG_MEMORY_HOTREMOVE
> > +void arch_remove_memory(int nid, u64 start,
> > + u64 size, struct vmem_altmap *altmap)
> > +{
> > + unsigned long start_pfn = start >> PAGE_SHIFT;
> > + unsigned long nr_pages = size >> PAGE_SHIFT;
> > + struct page *page = pfn_to_page(start_pfn);
> > +
> > + /* With altmap the first mapped page is offset from @start */
> > + if (altmap)
> > + page += vmem_altmap_offset(altmap);
> > + __remove_pages(start_pfn, nr_pages, altmap);
> > +}
> > +#endif
> > +#endif
> > +
> > +/*
> > + * Align swapper_pg_dir in to 64K, allows its address to be loaded
> > + * with a single LUI instruction in the TLB handlers. If we used
> > + * __aligned(64K), its size would get rounded up to the alignment
> > + * size, and waste space. So we place it in its own section and align
> > + * it in the linker script.
> > + */
> > +pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
> > +
> > +pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss;
> > +#ifndef __PAGETABLE_PUD_FOLDED
> > +pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
> > +#endif
> > +#ifndef __PAGETABLE_PMD_FOLDED
> > +pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
> > +EXPORT_SYMBOL_GPL(invalid_pmd_table);
> > +#endif
> > +pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
> > +EXPORT_SYMBOL(invalid_pte_table);
> > diff --git a/arch/loongarch/mm/ioremap.c b/arch/loongarch/mm/ioremap.c
> > new file mode 100644
> > index 000000000000..515462cbbd8c
> > --- /dev/null
> > +++ b/arch/loongarch/mm/ioremap.c
> > @@ -0,0 +1,27 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <asm/io.h>
> > +
> > +void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size)
> > +{
> > + return ((void *)TO_CAC(phys_addr));
> > +}
> > +
> > +void __init early_iounmap(void __iomem *addr, unsigned long size)
> > +{
> > +
> > +}
> > +
> > +void *early_memremap_ro(resource_size_t phys_addr, unsigned long size)
> > +{
> > + return early_memremap(phys_addr, size);
> > +}
> > +
> > +void *early_memremap_prot(resource_size_t phys_addr, unsigned long size,
> > + unsigned long prot_val)
> > +{
> > + return early_memremap(phys_addr, size);
> > +}
> > diff --git a/arch/loongarch/mm/maccess.c b/arch/loongarch/mm/maccess.c
> > new file mode 100644
> > index 000000000000..58173842c6be
> > --- /dev/null
> > +++ b/arch/loongarch/mm/maccess.c
> > @@ -0,0 +1,10 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +
> > +#include <linux/uaccess.h>
> > +#include <linux/kernel.h>
> > +
> > +bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
> > +{
> > + /* highest bit set means kernel space */
> > + return (unsigned long)unsafe_src >> (BITS_PER_LONG - 1);
> > +}
> > diff --git a/arch/loongarch/mm/mmap.c b/arch/loongarch/mm/mmap.c
> > new file mode 100644
> > index 000000000000..4c05e0dba649
> > --- /dev/null
> > +++ b/arch/loongarch/mm/mmap.c
> > @@ -0,0 +1,204 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/compiler.h>
> > +#include <linux/elf-randomize.h>
> > +#include <linux/errno.h>
> > +#include <linux/mm.h>
> > +#include <linux/mman.h>
> > +#include <linux/export.h>
> > +#include <linux/personality.h>
> > +#include <linux/random.h>
> > +#include <linux/sched/signal.h>
> > +#include <linux/sched/mm.h>
> > +
> > +unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
> > +EXPORT_SYMBOL(shm_align_mask);
> > +
> > +/* gap between mmap and stack */
> > +#define MIN_GAP (128*1024*1024UL)
> > +#define MAX_GAP ((TASK_SIZE)/6*5)
> > +
> > +static int mmap_is_legacy(struct rlimit *rlim_stack)
> > +{
> > + if (current->personality & ADDR_COMPAT_LAYOUT)
> > + return 1;
> > +
> > + if (rlim_stack->rlim_cur == RLIM_INFINITY)
> > + return 1;
> > +
> > + return sysctl_legacy_va_layout;
> > +}
> > +
> > +static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
> > +{
> > + unsigned long gap = rlim_stack->rlim_cur;
> > +
> > + if (gap < MIN_GAP)
> > + gap = MIN_GAP;
> > + else if (gap > MAX_GAP)
> > + gap = MAX_GAP;
> > +
> > + return PAGE_ALIGN(TASK_SIZE - gap - rnd);
> > +}
> > +
> > +#define COLOUR_ALIGN(addr, pgoff) \
> > + ((((addr) + shm_align_mask) & ~shm_align_mask) + \
> > + (((pgoff) << PAGE_SHIFT) & shm_align_mask))
> > +
> > +enum mmap_allocation_direction {UP, DOWN};
> > +
> > +static unsigned long arch_get_unmapped_area_common(struct file *filp,
> > + unsigned long addr0, unsigned long len, unsigned long pgoff,
> > + unsigned long flags, enum mmap_allocation_direction dir)
> > +{
> > + struct mm_struct *mm = current->mm;
> > + struct vm_area_struct *vma;
> > + unsigned long addr = addr0;
> > + int do_color_align;
> > + struct vm_unmapped_area_info info;
> > +
> > + if (unlikely(len > TASK_SIZE))
> > + return -ENOMEM;
> > +
> > + if (flags & MAP_FIXED) {
> > + /* Even MAP_FIXED mappings must reside within TASK_SIZE */
> > + if (TASK_SIZE - len < addr)
> > + return -EINVAL;
> > +
> > + /*
> > + * We do not accept a shared mapping if it would violate
> > + * cache aliasing constraints.
> > + */
> > + if ((flags & MAP_SHARED) &&
> > + ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
> > + return -EINVAL;
> > + return addr;
> > + }
> > +
> > + do_color_align = 0;
> > + if (filp || (flags & MAP_SHARED))
> > + do_color_align = 1;
> > +
> > + /* requesting a specific address */
> > + if (addr) {
> > + if (do_color_align)
> > + addr = COLOUR_ALIGN(addr, pgoff);
> > + else
> > + addr = PAGE_ALIGN(addr);
> > +
> > + vma = find_vma(mm, addr);
> > + if (TASK_SIZE - len >= addr &&
> > + (!vma || addr + len <= vm_start_gap(vma)))
> > + return addr;
> > + }
> > +
> > + info.length = len;
> > + info.align_mask = do_color_align ? (PAGE_MASK & shm_align_mask) : 0;
> > + info.align_offset = pgoff << PAGE_SHIFT;
> > +
> > + if (dir == DOWN) {
> > + info.flags = VM_UNMAPPED_AREA_TOPDOWN;
> > + info.low_limit = PAGE_SIZE;
> > + info.high_limit = mm->mmap_base;
> > + addr = vm_unmapped_area(&info);
> > +
> > + if (!(addr & ~PAGE_MASK))
> > + return addr;
> > +
> > + /*
> > + * A failed mmap() very likely causes application failure,
> > + * so fall back to the bottom-up function here. This scenario
> > + * can happen with large stack limits and large mmap()
> > + * allocations.
> > + */
> > + }
> > +
> > + info.flags = 0;
> > + info.low_limit = mm->mmap_base;
> > + info.high_limit = TASK_SIZE;
> > + return vm_unmapped_area(&info);
> > +}
> > +
> > +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr0,
> > + unsigned long len, unsigned long pgoff, unsigned long flags)
> > +{
> > + return arch_get_unmapped_area_common(filp,
> > + addr0, len, pgoff, flags, UP);
> > +}
> > +
> > +/*
> > + * There is no need to export this but sched.h declares the function as
> > + * extern so making it static here results in an error.
> > + */
> > +unsigned long arch_get_unmapped_area_topdown(struct file *filp,
> > + unsigned long addr0, unsigned long len, unsigned long pgoff,
> > + unsigned long flags)
> > +{
> > + return arch_get_unmapped_area_common(filp,
> > + addr0, len, pgoff, flags, DOWN);
> > +}
> > +
> > +unsigned long arch_mmap_rnd(void)
> > +{
> > + unsigned long rnd;
> > +
> > + rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1);
> > +
> > + return rnd << PAGE_SHIFT;
> > +}
> > +
> > +void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> > +{
> > + unsigned long random_factor = 0UL;
> > +
> > + if (current->flags & PF_RANDOMIZE)
> > + random_factor = arch_mmap_rnd();
> > +
> > + if (mmap_is_legacy(rlim_stack)) {
> > + mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
> > + mm->get_unmapped_area = arch_get_unmapped_area;
> > + } else {
> > + mm->mmap_base = mmap_base(random_factor, rlim_stack);
> > + mm->get_unmapped_area = arch_get_unmapped_area_topdown;
> > + }
> > +}
> Duplicated codes, try to use arch_pick_mmap_layout in mm/utils.c.
OK, thanks.
>
>
> > +
> > +static inline unsigned long brk_rnd(void)
> > +{
> > + unsigned long rnd = get_random_long();
> > +
> > + rnd = rnd << PAGE_SHIFT;
> > + /* 8MB for 32bit, 256MB for 64bit */
> > + if (TASK_IS_32BIT_ADDR)
> > + rnd = rnd & 0x7ffffful;
> > + else
> > + rnd = rnd & 0xffffffful;
> > +
> > + return rnd;
> > +}
> > +
> > +unsigned long arch_randomize_brk(struct mm_struct *mm)
> > +{
> > + unsigned long base = mm->brk;
> > + unsigned long ret;
> > +
> > + ret = PAGE_ALIGN(base + brk_rnd());
> > +
> > + if (ret < mm->brk)
> > + return mm->brk;
> > +
> > + return ret;
> > +}
> Ditto, try CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
>
> > +
> > +int __virt_addr_valid(const volatile void *kaddr)
> > +{
> > + unsigned long vaddr = (unsigned long)kaddr;
> > +
> > + if ((vaddr < PAGE_OFFSET) || (vaddr >= vm_map_base))
> > + return 0;
> > +
> > + return pfn_valid(PFN_DOWN(virt_to_phys(kaddr)));
> > +}
> > +EXPORT_SYMBOL_GPL(__virt_addr_valid);
> > diff --git a/arch/loongarch/mm/page.S b/arch/loongarch/mm/page.S
> > new file mode 100644
> > index 000000000000..548e3e325795
> > --- /dev/null
> > +++ b/arch/loongarch/mm/page.S
> > @@ -0,0 +1,93 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/linkage.h>
> > +#include <asm/asm.h>
> > +#include <asm/export.h>
> > +#include <asm/regdef.h>
> > +
> > +#ifdef CONFIG_PAGE_SIZE_4KB
> > +#define PAGE_SHIFT 12
> > +#endif
> > +#ifdef CONFIG_PAGE_SIZE_16KB
> > +#define PAGE_SHIFT 14
> > +#endif
> > +#ifdef CONFIG_PAGE_SIZE_64KB
> > +#define PAGE_SHIFT 16
> > +#endif
> > +
> > + .align 5
> > +SYM_FUNC_START(clear_page)
> > + lu12i.w t0, 1 << (PAGE_SHIFT - 12)
> > + add.d t0, t0, a0
> > +1:
> > + st.d zero, a0, 0
> > + st.d zero, a0, 8
> > + st.d zero, a0, 16
> > + st.d zero, a0, 24
> > + st.d zero, a0, 32
> > + st.d zero, a0, 40
> > + st.d zero, a0, 48
> > + st.d zero, a0, 56
> > + addi.d a0, a0, 128
> > + st.d zero, a0, -64
> > + st.d zero, a0, -56
> > + st.d zero, a0, -48
> > + st.d zero, a0, -40
> > + st.d zero, a0, -32
> > + st.d zero, a0, -24
> > + st.d zero, a0, -16
> > + st.d zero, a0, -8
> > + bne t0, a0, 1b
> > +
> > + jirl $r0, ra, 0
> > +SYM_FUNC_END(clear_page)
> > +EXPORT_SYMBOL(clear_page)
> > +
> > +.align 5
> > +SYM_FUNC_START(copy_page)
> > + lu12i.w t8, 1 << (PAGE_SHIFT - 12)
> > + add.d t8, t8, a0
> > +1:
> > + ld.d t0, a1, 0
> > + ld.d t1, a1, 8
> > + ld.d t2, a1, 16
> > + ld.d t3, a1, 24
> > + ld.d t4, a1, 32
> > + ld.d t5, a1, 40
> > + ld.d t6, a1, 48
> > + ld.d t7, a1, 56
> > +
> > + st.d t0, a0, 0
> > + st.d t1, a0, 8
> > + ld.d t0, a1, 64
> > + ld.d t1, a1, 72
> > + st.d t2, a0, 16
> > + st.d t3, a0, 24
> > + ld.d t2, a1, 80
> > + ld.d t3, a1, 88
> > + st.d t4, a0, 32
> > + st.d t5, a0, 40
> > + ld.d t4, a1, 96
> > + ld.d t5, a1, 104
> > + st.d t6, a0, 48
> > + st.d t7, a0, 56
> > + ld.d t6, a1, 112
> > + ld.d t7, a1, 120
> > + addi.d a0, a0, 128
> > + addi.d a1, a1, 128
> > +
> > + st.d t0, a0, -64
> > + st.d t1, a0, -56
> > + st.d t2, a0, -48
> > + st.d t3, a0, -40
> > + st.d t4, a0, -32
> > + st.d t5, a0, -24
> > + st.d t6, a0, -16
> > + st.d t7, a0, -8
> > +
> > + bne t8, a0, 1b
> > + jirl $r0, ra, 0
> > +SYM_FUNC_END(copy_page)
> > +EXPORT_SYMBOL(copy_page)
> > diff --git a/arch/loongarch/mm/pgtable-64.c b/arch/loongarch/mm/pgtable-64.c
> > new file mode 100644
> > index 000000000000..caa6792429b9
> > --- /dev/null
> > +++ b/arch/loongarch/mm/pgtable-64.c
> > @@ -0,0 +1,116 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/export.h>
> > +#include <linux/init.h>
> > +#include <linux/mm.h>
> > +#include <asm/pgtable.h>
> > +#include <asm/pgalloc.h>
> > +#include <asm/tlbflush.h>
> > +
> > +void pgd_init(unsigned long page)
> > +{
> > + unsigned long *p, *end;
> > + unsigned long entry;
> > +
> > +#if !defined(__PAGETABLE_PUD_FOLDED)
> > + entry = (unsigned long)invalid_pud_table;
> > +#elif !defined(__PAGETABLE_PMD_FOLDED)
> > + entry = (unsigned long)invalid_pmd_table;
> > +#else
> > + entry = (unsigned long)invalid_pte_table;
> > +#endif
> > +
> > + p = (unsigned long *) page;
> > + end = p + PTRS_PER_PGD;
> > +
> > + do {
> > + p[0] = entry;
> > + p[1] = entry;
> > + p[2] = entry;
> > + p[3] = entry;
> > + p[4] = entry;
> > + p += 8;
> > + p[-3] = entry;
> > + p[-2] = entry;
> > + p[-1] = entry;
> > + } while (p != end);
> > +}
> > +
> > +#ifndef __PAGETABLE_PMD_FOLDED
> > +void pmd_init(unsigned long addr, unsigned long pagetable)
> > +{
> > + unsigned long *p, *end;
> > +
> > + p = (unsigned long *) addr;
> > + end = p + PTRS_PER_PMD;
> > +
> > + do {
> > + p[0] = pagetable;
> > + p[1] = pagetable;
> > + p[2] = pagetable;
> > + p[3] = pagetable;
> > + p[4] = pagetable;
> > + p += 8;
> > + p[-3] = pagetable;
> > + p[-2] = pagetable;
> > + p[-1] = pagetable;
> > + } while (p != end);
> > +}
> > +EXPORT_SYMBOL_GPL(pmd_init);
> > +#endif
> > +
> > +#ifndef __PAGETABLE_PUD_FOLDED
> > +void pud_init(unsigned long addr, unsigned long pagetable)
> > +{
> > + unsigned long *p, *end;
> > +
> > + p = (unsigned long *)addr;
> > + end = p + PTRS_PER_PUD;
> > +
> > + do {
> > + p[0] = pagetable;
> > + p[1] = pagetable;
> > + p[2] = pagetable;
> > + p[3] = pagetable;
> > + p[4] = pagetable;
> > + p += 8;
> > + p[-3] = pagetable;
> > + p[-2] = pagetable;
> > + p[-1] = pagetable;
> > + } while (p != end);
> > +}
> > +#endif
> > +
> > +pmd_t mk_pmd(struct page *page, pgprot_t prot)
> > +{
> > + pmd_t pmd;
> > +
> > + pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
> > +
> > + return pmd;
> > +}
> > +
> > +void set_pmd_at(struct mm_struct *mm, unsigned long addr,
> > + pmd_t *pmdp, pmd_t pmd)
> > +{
> > + *pmdp = pmd;
> > + flush_tlb_all();
> > +}
> > +
> > +void __init pagetable_init(void)
> > +{
> > + pgd_t *pgd_base;
> > +
> > + /* Initialize the entire pgd. */
> > + pgd_init((unsigned long)swapper_pg_dir);
> > + pgd_init((unsigned long)invalid_pg_dir);
> > +#ifndef __PAGETABLE_PUD_FOLDED
> > + pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table);
> > +#endif
> > +#ifndef __PAGETABLE_PMD_FOLDED
> > + pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
> > +#endif
> > + pgd_base = swapper_pg_dir;
> > +}
> > diff --git a/arch/loongarch/mm/pgtable.c b/arch/loongarch/mm/pgtable.c
> > new file mode 100644
> > index 000000000000..9f776f200f5c
> > --- /dev/null
> > +++ b/arch/loongarch/mm/pgtable.c
> > @@ -0,0 +1,24 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/export.h>
> > +#include <linux/mm.h>
> > +#include <linux/string.h>
> > +#include <asm/pgalloc.h>
> > +
> > +pgd_t *pgd_alloc(struct mm_struct *mm)
> > +{
> > + pgd_t *ret, *init;
> > +
> > + ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
> > + if (ret) {
> > + init = pgd_offset(&init_mm, 0UL);
> > + pgd_init((unsigned long)ret);
> > + memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
> > + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
> > + }
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(pgd_alloc);
> > diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c
> > new file mode 100644
> > index 000000000000..ec961f6a9688
> > --- /dev/null
> > +++ b/arch/loongarch/mm/tlb.c
> > @@ -0,0 +1,278 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/init.h>
> > +#include <linux/sched.h>
> > +#include <linux/smp.h>
> > +#include <linux/mm.h>
> > +#include <linux/hugetlb.h>
> > +#include <linux/export.h>
> > +
> > +#include <asm/cpu.h>
> > +#include <asm/bootinfo.h>
> > +#include <asm/mmu_context.h>
> > +#include <asm/pgtable.h>
> > +#include <asm/tlb.h>
> > +
> > +void local_flush_tlb_all(void)
> > +{
> > + invtlb_all(INVTLB_CURRENT_ALL, 0, 0);
> > +}
> > +EXPORT_SYMBOL(local_flush_tlb_all);
> > +
> > +/*
> > + * All entries common to a mm share an asid. To effectively flush
> > + * these entries, we just bump the asid.
> > + */
> > +void local_flush_tlb_mm(struct mm_struct *mm)
> > +{
> > + int cpu;
> > +
> > + preempt_disable();
> > +
> > + cpu = smp_processor_id();
> > +
> > + if (asid_valid(mm, cpu))
> > + drop_mmu_context(mm, cpu);
> > + else
> > + cpumask_clear_cpu(cpu, mm_cpumask(mm));
> > +
> > + preempt_enable();
> > +}
> > +
> > +void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
> > + unsigned long end)
> > +{
> > + struct mm_struct *mm = vma->vm_mm;
> > + int cpu = smp_processor_id();
> > +
> > + if (asid_valid(mm, cpu)) {
> > + unsigned long size, flags;
> > +
> > + local_irq_save(flags);
> > + start = round_down(start, PAGE_SIZE << 1);
> > + end = round_up(end, PAGE_SIZE << 1);
> > + size = (end - start) >> (PAGE_SHIFT + 1);
> > + if (size <= (current_cpu_data.tlbsizestlbsets ?
> > + current_cpu_data.tlbsize / 8 :
> > + current_cpu_data.tlbsize / 2)) {
> > + int asid = cpu_asid(cpu, mm);
> > +
> > + while (start < end) {
> > + invtlb(INVTLB_ADDR_GFALSE_AND_ASID, asid, start);
> > + start += (PAGE_SIZE << 1);
> > + }
> > + } else {
> > + drop_mmu_context(mm, cpu);
> > + }
> > + local_irq_restore(flags);
> > + } else {
> > + cpumask_clear_cpu(cpu, mm_cpumask(mm));
> > + }
> > +}
> > +
> > +void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
> > +{
> > + unsigned long size, flags;
> > +
> > + local_irq_save(flags);
> > + size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
> > + size = (size + 1) >> 1;
> > + if (size <= (current_cpu_data.tlbsizestlbsets ?
> > + current_cpu_data.tlbsize / 8 :
> > + current_cpu_data.tlbsize / 2)) {
> > +
> > + start &= (PAGE_MASK << 1);
> > + end += ((PAGE_SIZE << 1) - 1);
> > + end &= (PAGE_MASK << 1);
> > +
> > + while (start < end) {
> > + invtlb_addr(INVTLB_ADDR_GTRUE_OR_ASID, 0, start);
> > + start += (PAGE_SIZE << 1);
> > + }
> > + } else {
> > + local_flush_tlb_all();
> > + }
> > + local_irq_restore(flags);
> > +}
> > +
> > +void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
> > +{
> > + int cpu = smp_processor_id();
> > +
> > + if (asid_valid(vma->vm_mm, cpu)) {
> > + int newpid;
> > +
> > + newpid = cpu_asid(cpu, vma->vm_mm);
> > + page &= (PAGE_MASK << 1);
> > + invtlb(INVTLB_ADDR_GFALSE_AND_ASID, newpid, page);
> > + } else {
> > + cpumask_clear_cpu(cpu, mm_cpumask(vma->vm_mm));
> > + }
> > +}
> > +
> > +/*
> > + * This one is only used for pages with the global bit set so we don't care
> > + * much about the ASID.
> > + */
> > +void local_flush_tlb_one(unsigned long page)
> > +{
> > + page &= (PAGE_MASK << 1);
> > + invtlb_addr(INVTLB_ADDR_GTRUE_OR_ASID, 0, page);
> > +}
> > +
> > +static void __update_hugetlb(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
> > +{
> > + int idx;
> > + unsigned long lo;
> > + unsigned long flags;
> > +
> > + local_irq_save(flags);
> > +
> > + address &= (PAGE_MASK << 1);
> > + write_csr_entryhi(address);
> > + tlb_probe();
> > + idx = read_csr_tlbidx();
> > + write_csr_pagesize(PS_HUGE_SIZE);
> > + lo = pmd_to_entrylo(pte_val(*ptep));
> > + write_csr_entrylo0(lo);
> > + write_csr_entrylo1(lo + (HPAGE_SIZE >> 1));
> > +
> > + if (idx < 0)
> > + tlb_write_random();
> > + else
> > + tlb_write_indexed();
> > + write_csr_pagesize(PS_DEFAULT_SIZE);
> > +
> > + local_irq_restore(flags);
> > +}
> > +
> > +void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
> > +{
> > + int idx;
> > + unsigned long flags;
> > +
> > + /*
> > + * Handle debugger faulting in for debugee.
> > + */
> > + if (current->active_mm != vma->vm_mm)
> > + return;
> > +
> > + if (pte_val(*ptep) & _PAGE_HUGE)
> > + return __update_hugetlb(vma, address, ptep);
> > +
> > + local_irq_save(flags);
> > +
> > + if ((unsigned long)ptep & sizeof(pte_t))
> > + ptep--;
> > +
> > + address &= (PAGE_MASK << 1);
> > + write_csr_entryhi(address);
> > + tlb_probe();
> > + idx = read_csr_tlbidx();
> > + write_csr_pagesize(PS_DEFAULT_SIZE);
> > + write_csr_entrylo0(pte_val(*ptep++));
> > + write_csr_entrylo1(pte_val(*ptep));
> > + if (idx < 0)
> > + tlb_write_random();
> > + else
> > + tlb_write_indexed();
> > +
> > + local_irq_restore(flags);
> > +}
> > +
> > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> > +
> > +int has_transparent_hugepage(void)
> > +{
> > + static unsigned int size = -1;
> > +
> > + if (size == -1) { /* first call comes during __init */
> > + unsigned long flags;
> > +
> > + local_irq_save(flags);
> > + write_csr_pagesize(PS_HUGE_SIZE);
> > + size = read_csr_pagesize();
> > + write_csr_pagesize(PS_DEFAULT_SIZE);
> > + local_irq_restore(flags);
> > + }
> > + return size == PS_HUGE_SIZE;
> > +}
> > +
> > +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> > +
> > +static void setup_pw(void)
> > +{
> > + unsigned long pgd_i, pgd_w;
> > +#ifndef __PAGETABLE_PMD_FOLDED
> > + unsigned long pmd_i, pmd_w;
> > +#endif
> > + unsigned long pte_i, pte_w;
> > +
> > + pgd_i = PGDIR_SHIFT; /* 1st level PGD */
> > +#ifndef __PAGETABLE_PMD_FOLDED
> > + pgd_w = PGDIR_SHIFT - PMD_SHIFT + PGD_ORDER;
> > + pmd_i = PMD_SHIFT; /* 2nd level PMD */
> > + pmd_w = PMD_SHIFT - PAGE_SHIFT;
> > +#else
> > + pgd_w = PGDIR_SHIFT - PAGE_SHIFT + PGD_ORDER;
> > +#endif
> > + pte_i = PAGE_SHIFT; /* 3rd level PTE */
> > + pte_w = PAGE_SHIFT - 3;
> > +
> > +#ifndef __PAGETABLE_PMD_FOLDED
> > + csr_writeq(pte_i | pte_w << 5 | pmd_i << 10 | pmd_w << 15, LOONGARCH_CSR_PWCTL0);
> > + csr_writeq(pgd_i | pgd_w << 6, LOONGARCH_CSR_PWCTL1);
> > +#else
> > + csr_writeq(pte_i | pte_w << 5, LOONGARCH_CSR_PWCTL0);
> > + csr_writeq(pgd_i | pgd_w << 6, LOONGARCH_CSR_PWCTL1);
> > +#endif
> > + csr_writeq((long)swapper_pg_dir, LOONGARCH_CSR_PGDH);
> > +}
> > +
> > +static void output_pgtable_bits_defines(void)
> > +{
> > +#define pr_define(fmt, ...) \
> > + pr_debug("#define " fmt, ##__VA_ARGS__)
> > +
> > + pr_debug("#include <asm/asm.h>\n");
> > + pr_debug("#include <asm/regdef.h>\n");
> > + pr_debug("\n");
> > +
> > + pr_define("_PAGE_VALID_SHIFT %d\n", _PAGE_VALID_SHIFT);
> > + pr_define("_PAGE_DIRTY_SHIFT %d\n", _PAGE_DIRTY_SHIFT);
> > + pr_define("_PAGE_HUGE_SHIFT %d\n", _PAGE_HUGE_SHIFT);
> > + pr_define("_PAGE_GLOBAL_SHIFT %d\n", _PAGE_GLOBAL_SHIFT);
> > + pr_define("_PAGE_PRESENT_SHIFT %d\n", _PAGE_PRESENT_SHIFT);
> > + pr_define("_PAGE_WRITE_SHIFT %d\n", _PAGE_WRITE_SHIFT);
> > + pr_define("_PAGE_NO_READ_SHIFT %d\n", _PAGE_NO_READ_SHIFT);
> > + pr_define("_PAGE_NO_EXEC_SHIFT %d\n", _PAGE_NO_EXEC_SHIFT);
> > + pr_define("_PFN_SHIFT %d\n", _PFN_SHIFT);
> > + pr_debug("\n");
> > +}
> > +
> > +void setup_tlb_handler(void)
> > +{
> > + static int run_once = 0;
> > +
> > + setup_pw();
> > + output_pgtable_bits_defines();
> > +
> > + /* The tlb handlers are generated only once */
> > + if (!run_once) {
> > + memcpy((void *)tlbrentry, handle_tlb_refill, 0x80);
> > + local_flush_icache_range(tlbrentry, tlbrentry + 0x80);
> > + run_once++;
> > + }
> > +}
> > +void tlb_init(void)
> > +{
> > + write_csr_pagesize(PS_DEFAULT_SIZE);
> > +
> > + if (read_csr_pagesize() != PS_DEFAULT_SIZE)
> > + panic("MMU doesn't support PAGE_SIZE=0x%lx", PAGE_SIZE);
> > +
> > + setup_tlb_handler();
> > + local_flush_tlb_all();
> > +}
> > diff --git a/arch/loongarch/mm/tlbex.S b/arch/loongarch/mm/tlbex.S
> > new file mode 100644
> > index 000000000000..4ba35d6d7a49
> > --- /dev/null
> > +++ b/arch/loongarch/mm/tlbex.S
> > @@ -0,0 +1,473 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> > + */
> > +#include <asm/asm.h>
> > +#include <asm/export.h>
> > +#include <asm/loongarchregs.h>
> > +#include <asm/page.h>
> > +#include <asm/pgtable-bits.h>
> > +#include <asm/regdef.h>
> > +#include <asm/stackframe.h>
> > +
> > +#ifdef CONFIG_64BIT
> > +#include <asm/pgtable-64.h>
> > +#endif
> > +
> > + .macro tlb_do_page_fault, write
> > + SYM_FUNC_START(tlb_do_page_fault_\write)
> > + SAVE_ALL
> > + csrrd a2, LOONGARCH_CSR_BADV
> > + KMODE
> > + move a0, sp
> > + REG_S a2, sp, PT_BVADDR
> > + li.w a1, \write
> > + la.abs t0, do_page_fault
> > + jirl ra, t0, 0
> > + la.abs t0, ret_from_exception
> > + jirl zero, t0, 0
> > + SYM_FUNC_END(tlb_do_page_fault_\write)
> > + .endm
> > +
> > +SYM_FUNC_START(handle_tlb_rixi)
> > + csrwr t0, EXCEPTION_KS0
> > + csrwr t1, EXCEPTION_KS1
> > +SYM_FUNC_END(handle_tlb_rixi)
> > + /* Go through */
> > + tlb_do_page_fault 0
> > + tlb_do_page_fault 1
> > +
> > +SYM_FUNC_START(handle_tlb_load)
> > + csrwr t0, EXCEPTION_KS0
> > + csrwr t1, EXCEPTION_KS1
> > + csrwr ra, EXCEPTION_KS2
> > +
> > + /*
> > + * The vmalloc handling is not in the hotpath.
> > + */
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + blt t0, $r0, vmalloc_load
> > + csrrd t1, LOONGARCH_CSR_PGDL
> > +
> > +vmalloc_done_load:
> > + /* Get PGD offset in bytes */
> > + srli.d t0, t0, PGDIR_SHIFT
> > + andi t0, t0, (PTRS_PER_PGD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#if CONFIG_PGTABLE_LEVELS > 3
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + ld.d t1, t1, 0
> > + srli.d t0, t0, PUD_SHIFT
> > + andi t0, t0, (PTRS_PER_PUD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#endif
> > +#if CONFIG_PGTABLE_LEVELS > 2
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + ld.d t1, t1, 0
> > + srli.d t0, t0, PMD_SHIFT
> > + andi t0, t0, (PTRS_PER_PMD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#endif
> > + ld.d ra, t1, 0
> > +
> > + /*
> > + * For huge tlb entries, pmde doesn't contain an address but
> > + * instead contains the tlb pte. Check the PAGE_HUGE bit and
> > + * see if we need to jump to huge tlb processing.
> > + */
> > + andi t0, ra, _PAGE_HUGE
> > + bne t0, $r0, tlb_huge_update_load
> > +
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + srli.d t0, t0, (PAGE_SHIFT + PTE_ORDER)
> > + andi t0, t0, (PTRS_PER_PTE - 1)
> > + slli.d t0, t0, _PTE_T_LOG2
> > + add.d t1, ra, t0
> > +
> > + ld.d t0, t1, 0
> > + tlbsrch
> > +
> > + srli.d ra, t0, _PAGE_PRESENT_SHIFT
> > + andi ra, ra, 1
> > + beq ra, $r0, nopage_tlb_load
> > +
> > + ori t0, t0, _PAGE_VALID
> > + st.d t0, t1, 0
> > + ori t1, t1, 8
> > + xori t1, t1, 8
> > + ld.d t0, t1, 0
> > + ld.d t1, t1, 8
> > + csrwr t0, LOONGARCH_CSR_TLBELO0
> > + csrwr t1, LOONGARCH_CSR_TLBELO1
> > + tlbwr
> > +leave_load:
> > + csrrd t0, EXCEPTION_KS0
> > + csrrd t1, EXCEPTION_KS1
> > + csrrd ra, EXCEPTION_KS2
> > + ertn
> > +#ifdef CONFIG_64BIT
> > +vmalloc_load:
> > + la.abs t1, swapper_pg_dir
> > + b vmalloc_done_load
> > +#endif
> > +
> > + /*
> > + * This is the entry point when build_tlbchange_handler_head
> > + * spots a huge page.
> > + */
> > +tlb_huge_update_load:
> > + ld.d t0, t1, 0
> > + srli.d ra, t0, _PAGE_PRESENT_SHIFT
> > + andi ra, ra, 1
> > + beq ra, $r0, nopage_tlb_load
> > + tlbsrch
> > +
> > + ori t0, t0, _PAGE_VALID
> > + st.d t0, t1, 0
> > + addu16i.d t1, $r0, -(CSR_TLBIDX_EHINV >> 16)
> > + addi.d ra, t1, 0
> > + csrxchg ra, t1, LOONGARCH_CSR_TLBIDX
> > + tlbwr
> > +
> > + csrxchg $r0, t1, LOONGARCH_CSR_TLBIDX
> > +
> > + /*
> > + * A huge PTE describes an area the size of the
> > + * configured huge page size. This is twice the
> > + * of the large TLB entry size we intend to use.
> > + * A TLB entry half the size of the configured
> > + * huge page size is configured into entrylo0
> > + * and entrylo1 to cover the contiguous huge PTE
> > + * address space.
> > + */
> > + /* Huge page: Move Global bit */
> > + xori t0, t0, _PAGE_HUGE
> > + lu12i.w t1, _PAGE_HGLOBAL >> 12
> > + and t1, t0, t1
> > + srli.d t1, t1, (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)
> > + or t0, t0, t1
> > +
> > + addi.d ra, t0, 0
> > + csrwr t0, LOONGARCH_CSR_TLBELO0
> > + addi.d t0, ra, 0
> > +
> > + /* Convert to entrylo1 */
> > + addi.d t1, $r0, 1
> > + slli.d t1, t1, (HPAGE_SHIFT - 1)
> > + add.d t0, t0, t1
> > + csrwr t0, LOONGARCH_CSR_TLBELO1
> > +
> > + /* Set huge page tlb entry size */
> > + addu16i.d t0, $r0, (PS_MASK >> 16)
> > + addu16i.d t1, $r0, (PS_HUGE_SIZE << (PS_SHIFT - 16))
> > + csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
> > +
> > + tlbfill
> > +
> > + addu16i.d t0, $r0, (PS_MASK >> 16)
> > + addu16i.d t1, $r0, (PS_DEFAULT_SIZE << (PS_SHIFT - 16))
> > + csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
> > +
> > +nopage_tlb_load:
> > + csrrd ra, EXCEPTION_KS2
> > + la.abs t0, tlb_do_page_fault_0
> > + jirl $r0, t0, 0
> > +SYM_FUNC_END(handle_tlb_load)
> > +
> > +SYM_FUNC_START(handle_tlb_store)
> > + csrwr t0, EXCEPTION_KS0
> > + csrwr t1, EXCEPTION_KS1
> > + csrwr ra, EXCEPTION_KS2
> > +
> > + /*
> > + * The vmalloc handling is not in the hotpath.
> > + */
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + blt t0, $r0, vmalloc_store
> > + csrrd t1, LOONGARCH_CSR_PGDL
> > +
> > +vmalloc_done_store:
> > + /* Get PGD offset in bytes */
> > + srli.d t0, t0, PGDIR_SHIFT
> > + andi t0, t0, (PTRS_PER_PGD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +
> > +#if CONFIG_PGTABLE_LEVELS > 3
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + ld.d t1, t1, 0
> > + srli.d t0, t0, PUD_SHIFT
> > + andi t0, t0, (PTRS_PER_PUD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#endif
> > +#if CONFIG_PGTABLE_LEVELS > 2
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + ld.d t1, t1, 0
> > + srli.d t0, t0, PMD_SHIFT
> > + andi t0, t0, (PTRS_PER_PMD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#endif
> > + ld.d ra, t1, 0
> > +
> > + /*
> > + * For huge tlb entries, pmde doesn't contain an address but
> > + * instead contains the tlb pte. Check the PAGE_HUGE bit and
> > + * see if we need to jump to huge tlb processing.
> > + */
> > + andi t0, ra, _PAGE_HUGE
> > + bne t0, $r0, tlb_huge_update_store
> > +
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + srli.d t0, t0, (PAGE_SHIFT + PTE_ORDER)
> > + andi t0, t0, (PTRS_PER_PTE - 1)
> > + slli.d t0, t0, _PTE_T_LOG2
> > + add.d t1, ra, t0
> > +
> > + ld.d t0, t1, 0
> > + tlbsrch
> > +
> > + srli.d ra, t0, _PAGE_PRESENT_SHIFT
> > + andi ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
> > + xori ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
> > + bne ra, $r0, nopage_tlb_store
> > +
> > + ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY)
> > + st.d t0, t1, 0
> > +
> > + ori t1, t1, 8
> > + xori t1, t1, 8
> > + ld.d t0, t1, 0
> > + ld.d t1, t1, 8
> > + csrwr t0, LOONGARCH_CSR_TLBELO0
> > + csrwr t1, LOONGARCH_CSR_TLBELO1
> > + tlbwr
> > +leave_store:
> > + csrrd t0, EXCEPTION_KS0
> > + csrrd t1, EXCEPTION_KS1
> > + csrrd ra, EXCEPTION_KS2
> > + ertn
> > +#ifdef CONFIG_64BIT
> > +vmalloc_store:
> > + la.abs t1, swapper_pg_dir
> > + b vmalloc_done_store
> > +#endif
> > +
> > + /*
> > + * This is the entry point when build_tlbchange_handler_head
> > + * spots a huge page.
> > + */
> > +tlb_huge_update_store:
> > + ld.d t0, t1, 0
> > + srli.d ra, t0, _PAGE_PRESENT_SHIFT
> > + andi ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
> > + xori ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
> > + bne ra, $r0, nopage_tlb_store
> > +
> > + tlbsrch
> > + ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY)
> > +
> > + st.d t0, t1, 0
> > + addu16i.d t1, $r0, -(CSR_TLBIDX_EHINV >> 16)
> > + addi.d ra, t1, 0
> > + csrxchg ra, t1, LOONGARCH_CSR_TLBIDX
> > + tlbwr
> > +
> > + csrxchg $r0, t1, LOONGARCH_CSR_TLBIDX
> > + /*
> > + * A huge PTE describes an area the size of the
> > + * configured huge page size. This is twice the
> > + * of the large TLB entry size we intend to use.
> > + * A TLB entry half the size of the configured
> > + * huge page size is configured into entrylo0
> > + * and entrylo1 to cover the contiguous huge PTE
> > + * address space.
> > + */
> > + /* Huge page: Move Global bit */
> > + xori t0, t0, _PAGE_HUGE
> > + lu12i.w t1, _PAGE_HGLOBAL >> 12
> > + and t1, t0, t1
> > + srli.d t1, t1, (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)
> > + or t0, t0, t1
> > +
> > + addi.d ra, t0, 0
> > + csrwr t0, LOONGARCH_CSR_TLBELO0
> > + addi.d t0, ra, 0
> > +
> > + /* Convert to entrylo1 */
> > + addi.d t1, $r0, 1
> > + slli.d t1, t1, (HPAGE_SHIFT - 1)
> > + add.d t0, t0, t1
> > + csrwr t0, LOONGARCH_CSR_TLBELO1
> > +
> > + /* Set huge page tlb entry size */
> > + addu16i.d t0, $r0, (PS_MASK >> 16)
> > + addu16i.d t1, $r0, (PS_HUGE_SIZE << (PS_SHIFT - 16))
> > + csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
> > +
> > + tlbfill
> > +
> > + /* Reset default page size */
> > + addu16i.d t0, $r0, (PS_MASK >> 16)
> > + addu16i.d t1, $r0, (PS_DEFAULT_SIZE << (PS_SHIFT - 16))
> > + csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
> > +
> > +nopage_tlb_store:
> > + csrrd ra, EXCEPTION_KS2
> > + la.abs t0, tlb_do_page_fault_1
> > + jirl $r0, t0, 0
> > +SYM_FUNC_END(handle_tlb_store)
> > +
> > +SYM_FUNC_START(handle_tlb_modify)
> > + csrwr t0, EXCEPTION_KS0
> > + csrwr t1, EXCEPTION_KS1
> > + csrwr ra, EXCEPTION_KS2
> > +
> > + /*
> > + * The vmalloc handling is not in the hotpath.
> > + */
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + blt t0, $r0, vmalloc_modify
> > + csrrd t1, LOONGARCH_CSR_PGDL
> > +
> > +vmalloc_done_modify:
> > + /* Get PGD offset in bytes */
> > + srli.d t0, t0, PGDIR_SHIFT
> > + andi t0, t0, (PTRS_PER_PGD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#if CONFIG_PGTABLE_LEVELS > 3
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + ld.d t1, t1, 0
> > + srli.d t0, t0, PUD_SHIFT
> > + andi t0, t0, (PTRS_PER_PUD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#endif
> > +#if CONFIG_PGTABLE_LEVELS > 2
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + ld.d t1, t1, 0
> > + srli.d t0, t0, PMD_SHIFT
> > + andi t0, t0, (PTRS_PER_PMD - 1)
> > + slli.d t0, t0, 3
> > + add.d t1, t1, t0
> > +#endif
> > + ld.d ra, t1, 0
> > +
> > + /*
> > + * For huge tlb entries, pmde doesn't contain an address but
> > + * instead contains the tlb pte. Check the PAGE_HUGE bit and
> > + * see if we need to jump to huge tlb processing.
> > + */
> > + andi t0, ra, _PAGE_HUGE
> > + bne t0, $r0, tlb_huge_update_modify
> > +
> > + csrrd t0, LOONGARCH_CSR_BADV
> > + srli.d t0, t0, (PAGE_SHIFT + PTE_ORDER)
> > + andi t0, t0, (PTRS_PER_PTE - 1)
> > + slli.d t0, t0, _PTE_T_LOG2
> > + add.d t1, ra, t0
> > +
> > + ld.d t0, t1, 0
> > + tlbsrch
> > +
> > + srli.d ra, t0, _PAGE_WRITE_SHIFT
> > + andi ra, ra, 1
> > + beq ra, $r0, nopage_tlb_modify
> > +
> > + ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY)
> > + st.d t0, t1, 0
> > + ori t1, t1, 8
> > + xori t1, t1, 8
> > + ld.d t0, t1, 0
> > + ld.d t1, t1, 8
> > + csrwr t0, LOONGARCH_CSR_TLBELO0
> > + csrwr t1, LOONGARCH_CSR_TLBELO1
> > + tlbwr
> > +leave_modify:
> > + csrrd t0, EXCEPTION_KS0
> > + csrrd t1, EXCEPTION_KS1
> > + csrrd ra, EXCEPTION_KS2
> > + ertn
> > +#ifdef CONFIG_64BIT
> > +vmalloc_modify:
> > + la.abs t1, swapper_pg_dir
> > + b vmalloc_done_modify
> > +#endif
> > +
> > + /*
> > + * This is the entry point when
> > + * build_tlbchange_handler_head spots a huge page.
> > + */
> > +tlb_huge_update_modify:
> > + ld.d t0, t1, 0
> > +
> > + srli.d ra, t0, _PAGE_WRITE_SHIFT
> > + andi ra, ra, 1
> > + beq ra, $r0, nopage_tlb_modify
> > +
> > + tlbsrch
> > + ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY)
> > +
> > + st.d t0, t1, 0
> > + /*
> > + * A huge PTE describes an area the size of the
> > + * configured huge page size. This is twice the
> > + * of the large TLB entry size we intend to use.
> > + * A TLB entry half the size of the configured
> > + * huge page size is configured into entrylo0
> > + * and entrylo1 to cover the contiguous huge PTE
> > + * address space.
> > + */
> > + /* Huge page: Move Global bit */
> > + xori t0, t0, _PAGE_HUGE
> > + lu12i.w t1, _PAGE_HGLOBAL >> 12
> > + and t1, t0, t1
> > + srli.d t1, t1, (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)
> > + or t0, t0, t1
> > +
> > + addi.d ra, t0, 0
> > + csrwr t0, LOONGARCH_CSR_TLBELO0
> > + addi.d t0, ra, 0
> > +
> > + /* Convert to entrylo1 */
> > + addi.d t1, $r0, 1
> > + slli.d t1, t1, (HPAGE_SHIFT - 1)
> > + add.d t0, t0, t1
> > + csrwr t0, LOONGARCH_CSR_TLBELO1
> > +
> > + /* Set huge page tlb entry size */
> > + addu16i.d t0, $r0, (PS_MASK >> 16)
> > + addu16i.d t1, $r0, (PS_HUGE_SIZE << (PS_SHIFT - 16))
> > + csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
> > +
> > + tlbwr
> > +
> > + /* Reset default page size */
> > + addu16i.d t0, $r0, (PS_MASK >> 16)
> > + addu16i.d t1, $r0, (PS_DEFAULT_SIZE << (PS_SHIFT - 16))
> > + csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
> > +
> > +nopage_tlb_modify:
> > + csrrd ra, EXCEPTION_KS2
> > + la.abs t0, tlb_do_page_fault_1
> > + jirl $r0, t0, 0
> > +SYM_FUNC_END(handle_tlb_modify)
> > +
> > +SYM_FUNC_START(handle_tlb_refill)
> > + csrwr t0, LOONGARCH_CSR_TLBRSAVE
> > + csrrd t0, LOONGARCH_CSR_PGD
> > + lddir t0, t0, 3
> > +#if CONFIG_PGTABLE_LEVELS > 2
> > + lddir t0, t0, 1
> > +#endif
> > + ldpte t0, 0
> > + ldpte t0, 1
> > + tlbfill
> > + csrrd t0, LOONGARCH_CSR_TLBRSAVE
> > + ertn
> > +SYM_FUNC_END(handle_tlb_refill)
> The handle_tlb_refill is all loongarch PTW mechanism for all PAGE_SIZEs, right?
Yes.
Huacai
>
> > --
> > 2.27.0
> >
>
>
> --
> Best Regards
> Guo Ren
>
> ML: https://lore.kernel.org/linux-csky/
