From df7b2155bbe75525531e47c8a67ae4f1dbbae976 Mon Sep 17 00:00:00 2001 From: Nitin Gupta Date: Fri, 11 Aug 2017 16:46:50 -0700 Subject: sparc64: Add 16GB hugepage support Adds support for 16GB hugepage size. To use this page size use kernel parameters as: default_hugepagesz=16G hugepagesz=16G hugepages=10 Testing: Tested with the stream benchmark which allocates 48G of arrays backed by 16G hugepages and does RW operation on them in parallel. Orabug: 25362942 Cc: Anthony Yznaga Reviewed-by: Bob Picco Signed-off-by: Nitin Gupta Signed-off-by: David S. Miller --- arch/sparc/mm/init_64.c | 54 ++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 47 insertions(+), 7 deletions(-) (limited to 'arch/sparc/mm/init_64.c') diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index afa0099f3748..b2ba410b26f4 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -348,6 +348,18 @@ static int __init hugetlbpage_init(void) arch_initcall(hugetlbpage_init); +static void __init pud_huge_patch(void) +{ + struct pud_huge_patch_entry *p; + unsigned long addr; + + p = &__pud_huge_patch; + addr = p->addr; + *(unsigned int *)addr = p->insn; + + __asm__ __volatile__("flush %0" : : "r" (addr)); +} + static int __init setup_hugepagesz(char *string) { unsigned long long hugepage_size; @@ -360,6 +372,11 @@ static int __init setup_hugepagesz(char *string) hugepage_shift = ilog2(hugepage_size); switch (hugepage_shift) { + case HPAGE_16GB_SHIFT: + hv_pgsz_mask = HV_PGSZ_MASK_16GB; + hv_pgsz_idx = HV_PGSZ_IDX_16GB; + pud_huge_patch(); + break; case HPAGE_2GB_SHIFT: hv_pgsz_mask = HV_PGSZ_MASK_2GB; hv_pgsz_idx = HV_PGSZ_IDX_2GB; @@ -400,6 +417,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t * { struct mm_struct *mm; unsigned long flags; + bool is_huge_tsb; pte_t pte = *ptep; if (tlb_type != hypervisor) { @@ -417,15 +435,37 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t * spin_lock_irqsave(&mm->context.lock, flags); + is_huge_tsb = false; #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE) - if ((mm->context.hugetlb_pte_count || mm->context.thp_pte_count) && - is_hugetlb_pmd(__pmd(pte_val(pte)))) { - /* We are fabricating 8MB pages using 4MB real hw pages. */ - pte_val(pte) |= (address & (1UL << REAL_HPAGE_SHIFT)); - __update_mmu_tsb_insert(mm, MM_TSB_HUGE, REAL_HPAGE_SHIFT, - address, pte_val(pte)); - } else + if (mm->context.hugetlb_pte_count || mm->context.thp_pte_count) { + unsigned long hugepage_size = PAGE_SIZE; + + if (is_vm_hugetlb_page(vma)) + hugepage_size = huge_page_size(hstate_vma(vma)); + + if (hugepage_size >= PUD_SIZE) { + unsigned long mask = 0x1ffc00000UL; + + /* Transfer bits [32:22] from address to resolve + * at 4M granularity. + */ + pte_val(pte) &= ~mask; + pte_val(pte) |= (address & mask); + } else if (hugepage_size >= PMD_SIZE) { + /* We are fabricating 8MB pages using 4MB + * real hw pages. + */ + pte_val(pte) |= (address & (1UL << REAL_HPAGE_SHIFT)); + } + + if (hugepage_size >= PMD_SIZE) { + __update_mmu_tsb_insert(mm, MM_TSB_HUGE, + REAL_HPAGE_SHIFT, address, pte_val(pte)); + is_huge_tsb = true; + } + } #endif + if (!is_huge_tsb) __update_mmu_tsb_insert(mm, MM_TSB_BASE, PAGE_SHIFT, address, pte_val(pte)); -- cgit v1.2.3-59-g8ed1b