2 * PPC Huge TLB Page Support for Book3E MMU
4 * Copyright (C) 2009 David Gibson, IBM Corporation.
5 * Copyright (C) 2011 Becky Bruce, Freescale Semiconductor
9 #include <linux/hugetlb.h>
11 static inline int mmu_get_tsize(int psize)
13 return mmu_psize_defs[psize].enc;
16 static inline int book3e_tlb_exists(unsigned long ea, unsigned long pid)
20 mtspr(SPRN_MAS6, pid << 16);
21 if (mmu_has_feature(MMU_FTR_USE_TLBRSRV)) {
28 : "=&r"(found) : "r"(ea));
34 : "=&r"(found) : "r"(ea));
40 void book3e_hugetlb_preload(struct mm_struct *mm, unsigned long ea, pte_t pte)
42 unsigned long mas1, mas2;
44 unsigned long psize, tsize, shift;
47 #ifdef CONFIG_PPC_FSL_BOOK3E
49 struct vm_area_struct *vma;
52 if (unlikely(is_kernel_addr(ea)))
55 #ifdef CONFIG_PPC_MM_SLICES
56 psize = mmu_get_tsize(get_slice_psize(mm, ea));
57 tsize = mmu_get_psize(psize);
58 shift = mmu_psize_defs[psize].shift;
60 vma = find_vma(mm, ea);
61 psize = vma_mmu_pagesize(vma); /* returns actual size in bytes */
62 asm (PPC_CNTLZL "%0,%1" : "=r" (lz) : "r" (psize));
68 * We can't be interrupted while we're setting up the MAS
69 * regusters or after we've confirmed that no tlb exists.
71 local_irq_save(flags);
73 if (unlikely(book3e_tlb_exists(ea, mm->context.id))) {
74 local_irq_restore(flags);
78 #ifdef CONFIG_PPC_FSL_BOOK3E
79 ncams = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
81 /* We have to use the CAM(TLB1) on FSL parts for hugepages */
82 index = __get_cpu_var(next_tlbcam_idx);
83 mtspr(SPRN_MAS0, MAS0_ESEL(index) | MAS0_TLBSEL(1));
85 /* Just round-robin the entries and wrap when we hit the end */
86 if (unlikely(index == ncams - 1))
87 __get_cpu_var(next_tlbcam_idx) = tlbcam_index;
89 __get_cpu_var(next_tlbcam_idx)++;
91 mas1 = MAS1_VALID | MAS1_TID(mm->context.id) | MAS1_TSIZE(tsize);
92 mas2 = ea & ~((1UL << shift) - 1);
93 mas2 |= (pte_val(pte) >> PTE_WIMGE_SHIFT) & MAS2_WIMGE_MASK;
94 mas7_3 = (u64)pte_pfn(pte) << PAGE_SHIFT;
95 mas7_3 |= (pte_val(pte) >> PTE_BAP_SHIFT) & MAS3_BAP_MASK;
97 mas7_3 &= ~(MAS3_SW|MAS3_UW);
99 mtspr(SPRN_MAS1, mas1);
100 mtspr(SPRN_MAS2, mas2);
102 if (mmu_has_feature(MMU_FTR_USE_PAIRED_MAS)) {
103 mtspr(SPRN_MAS7_MAS3, mas7_3);
105 mtspr(SPRN_MAS7, upper_32_bits(mas7_3));
106 mtspr(SPRN_MAS3, lower_32_bits(mas7_3));
109 asm volatile ("tlbwe");
111 local_irq_restore(flags);
114 void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
116 struct hstate *hstate = hstate_file(vma->vm_file);
117 unsigned long tsize = huge_page_shift(hstate) - 10;
119 __flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, tsize, 0);