123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/*
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* PPC Huge TLB Page Support for Book3E MMU
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*
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* Copyright (C) 2009 David Gibson, IBM Corporation.
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* Copyright (C) 2011 Becky Bruce, Freescale Semiconductor
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*
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*/
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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static inline int mmu_get_tsize(int psize)
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{
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return mmu_psize_defs[psize].enc;
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}
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static inline int book3e_tlb_exists(unsigned long ea, unsigned long pid)
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{
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int found = 0;
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mtspr(SPRN_MAS6, pid << 16);
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if (mmu_has_feature(MMU_FTR_USE_TLBRSRV)) {
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asm volatile(
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"li %0,0\n"
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"tlbsx. 0,%1\n"
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"bne 1f\n"
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"li %0,1\n"
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"1:\n"
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: "=&r"(found) : "r"(ea));
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} else {
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asm volatile(
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"tlbsx 0,%1\n"
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"mfspr %0,0x271\n"
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"srwi %0,%0,31\n"
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: "=&r"(found) : "r"(ea));
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}
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return found;
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}
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void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
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pte_t pte)
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{
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unsigned long mas1, mas2;
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u64 mas7_3;
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unsigned long psize, tsize, shift;
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unsigned long flags;
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struct mm_struct *mm;
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#ifdef CONFIG_PPC_FSL_BOOK3E
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int index, ncams;
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#endif
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if (unlikely(is_kernel_addr(ea)))
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return;
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mm = vma->vm_mm;
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#ifdef CONFIG_PPC_MM_SLICES
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psize = get_slice_psize(mm, ea);
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tsize = mmu_get_tsize(psize);
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shift = mmu_psize_defs[psize].shift;
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#else
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psize = vma_mmu_pagesize(vma);
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shift = __ilog2(psize);
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tsize = shift - 10;
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#endif
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/*
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* We can't be interrupted while we're setting up the MAS
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* regusters or after we've confirmed that no tlb exists.
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*/
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local_irq_save(flags);
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if (unlikely(book3e_tlb_exists(ea, mm->context.id))) {
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local_irq_restore(flags);
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return;
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}
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#ifdef CONFIG_PPC_FSL_BOOK3E
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ncams = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
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/* We have to use the CAM(TLB1) on FSL parts for hugepages */
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index = __get_cpu_var(next_tlbcam_idx);
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mtspr(SPRN_MAS0, MAS0_ESEL(index) | MAS0_TLBSEL(1));
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/* Just round-robin the entries and wrap when we hit the end */
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if (unlikely(index == ncams - 1))
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__get_cpu_var(next_tlbcam_idx) = tlbcam_index;
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else
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__get_cpu_var(next_tlbcam_idx)++;
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#endif
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mas1 = MAS1_VALID | MAS1_TID(mm->context.id) | MAS1_TSIZE(tsize);
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mas2 = ea & ~((1UL << shift) - 1);
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mas2 |= (pte_val(pte) >> PTE_WIMGE_SHIFT) & MAS2_WIMGE_MASK;
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mas7_3 = (u64)pte_pfn(pte) << PAGE_SHIFT;
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mas7_3 |= (pte_val(pte) >> PTE_BAP_SHIFT) & MAS3_BAP_MASK;
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if (!pte_dirty(pte))
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mas7_3 &= ~(MAS3_SW|MAS3_UW);
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mtspr(SPRN_MAS1, mas1);
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mtspr(SPRN_MAS2, mas2);
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if (mmu_has_feature(MMU_FTR_USE_PAIRED_MAS)) {
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mtspr(SPRN_MAS7_MAS3, mas7_3);
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} else {
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mtspr(SPRN_MAS7, upper_32_bits(mas7_3));
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mtspr(SPRN_MAS3, lower_32_bits(mas7_3));
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}
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asm volatile ("tlbwe");
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local_irq_restore(flags);
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}
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void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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struct hstate *hstate = hstate_file(vma->vm_file);
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unsigned long tsize = huge_page_shift(hstate) - 10;
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__flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, tsize, 0);
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}
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