On Mon, Sep 07, 2020 at 04:50:45PM +0800, maobibo wrote: > Sorry for the late reply. > > Would you like to remove definition of macro pte_sw_mkyoung in header > file include/linux/pgtable.h, since it is not used any more. > > The others look good to me. > > regards > bibo,mao > > On 09/04/2020 04:49 PM, Huang Pei wrote: > > This version removes pte_sw_mkyoung without polluting MM code and covers > > both no-RIXI and RIXI MIPS CPUs and makes page fault delay of MIPS on par > > with other architecture > > > > MIPS page fault path take 3 exceptions (1 TLB Miss + 2 TLB Invalid), but > > the second TLB Invalid exception is just triggered by __update_tlb from > > do_page_fault writing tlb without _PAGE_VALID set. By making userspace > > mapping young by default, aka _PAGE_VALID and _PAGE_ACCESSED both set in > > prot, it only take 1 TLB Miss + 1 TLB Invalid exceptions > > > > [1]: https://lkml.kernel.org/lkml/1591416169-26666-1-git-send-email > > -maobibo@xxxxxxxxxxx/ > > > > Co-developed-by: Bibo Mao <maobibo@xxxxxxxxxx> > > Co-developed-by: Huang Pei <huangpei@xxxxxxxxxxx> > > Signed-off-by: Huang Pei <huangpei@xxxxxxxxxxx> > > --- > > arch/mips/include/asm/pgtable.h | 32 +++++++++++++++----------------- > > arch/mips/mm/cache.c | 25 +++++++++++++------------ > > mm/memory.c | 3 --- > > 3 files changed, 28 insertions(+), 32 deletions(-) > > > > diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h > > index dd7a0f552cac..aaafe3d6a0a1 100644 > > --- a/arch/mips/include/asm/pgtable.h > > +++ b/arch/mips/include/asm/pgtable.h > > @@ -25,22 +25,22 @@ > > struct mm_struct; > > struct vm_area_struct; > > > > -#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \ > > - _page_cachable_default) > > -#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ > > - _page_cachable_default) > > -#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \ > > - _page_cachable_default) > > -#define PAGE_READONLY __pgprot(_PAGE_PRESENT | \ > > - _page_cachable_default) > > -#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ > > - _PAGE_GLOBAL | _page_cachable_default) > > -#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ > > - _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT) > > -#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ > > - _page_cachable_default) > > +#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \ > > + _page_cachable_default) > > +#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ > > + __READABLE | _page_cachable_default) > > +#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \ > > + __READABLE | _page_cachable_default) > > +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | __READABLE | \ > > + _page_cachable_default) > > +#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ > > + _PAGE_GLOBAL | _page_cachable_default) > > +#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ > > + _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT) > > +#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ > > + _page_cachable_default) > > #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ > > - __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) > > + __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) > > > > /* > > * If _PAGE_NO_EXEC is not defined, we can't do page protection for > > @@ -414,8 +414,6 @@ static inline pte_t pte_mkyoung(pte_t pte) > > return pte; > > } > > > > -#define pte_sw_mkyoung pte_mkyoung > > - > > #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT > > static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } > > > > diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c > > index 3e81ba000096..ed75f2871aad 100644 > > --- a/arch/mips/mm/cache.c > > +++ b/arch/mips/mm/cache.c > > @@ -159,22 +159,23 @@ static inline void setup_protection_map(void) > > { > > if (cpu_has_rixi) { > > protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); > > - protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); > > + protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE); > > protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); > > - protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); > > - protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT); > > - protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT); > > - protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT); > > - protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT); > > + protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE); > > + protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE); > > + protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE); > > + protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE); > > + protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE); > > > > protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ); > > - protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC); > > + protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE); > > protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ); > > - protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE); > > - protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT); > > - protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT); > > - protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); > > - protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE); > > + protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | __READABLE); > > + protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE); > > + protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE); > > + protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE); > > + protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE); > > + > > > > } else { > > protection_map[0] = PAGE_NONE; > > diff --git a/mm/memory.c b/mm/memory.c > > index 602f4283122f..5100ab5bcf77 100644 > > --- a/mm/memory.c > > +++ b/mm/memory.c > > @@ -2705,7 +2705,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) > > } > > flush_cache_page(vma, vmf->address, pte_pfn(vmf->orig_pte)); > > entry = mk_pte(new_page, vma->vm_page_prot); > > - entry = pte_sw_mkyoung(entry); > > entry = maybe_mkwrite(pte_mkdirty(entry), vma); > > /* > > * Clear the pte entry and flush it first, before updating the > > @@ -3386,7 +3385,6 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf) > > __SetPageUptodate(page); > > > > entry = mk_pte(page, vma->vm_page_prot); > > - entry = pte_sw_mkyoung(entry); > > if (vma->vm_flags & VM_WRITE) > > entry = pte_mkwrite(pte_mkdirty(entry)); > > > > @@ -3661,7 +3659,6 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page) > > > > flush_icache_page(vma, page); > > entry = mk_pte(page, vma->vm_page_prot); > > - entry = pte_sw_mkyoung(entry); > > if (write) > > entry = maybe_mkwrite(pte_mkdirty(entry), vma); > > /* copy-on-write page */ > > I search for pte_sw_mkyoung/pte_{clear,mk,}_savewrite, none of which is used, do I really need to remove pte_sw_mkyoung in this patch just for *not used* ?
