1 files changed, 121 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hugetlbpage-book3e.c b/arch/powerpc/mm/hugetlbpage-book3e.c
new file mode 100644
index 0000000..343ad0b
--- /dev/null
+++ b/arch/powerpc/mm/hugetlbpage-book3e.c
@@ -0,0 +1,121 @@
+/*
+ * PPC Huge TLB Page Support for Book3E MMU
+ *
+ * Copyright (C) 2009 David Gibson, IBM Corporation.
+ * Copyright (C) 2011 Becky Bruce, Freescale Semiconductor
+ *
+ */
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+
+static inline int mmu_get_tsize(int psize)
+{
+	return mmu_psize_defs[psize].enc;
+}
+
+static inline int book3e_tlb_exists(unsigned long ea, unsigned long pid)
+{
+	int found = 0;
+
+	mtspr(SPRN_MAS6, pid << 16);
+	if (mmu_has_feature(MMU_FTR_USE_TLBRSRV)) {
+		asm volatile(
+			"li	%0,0\n"
+			"tlbsx.	0,%1\n"
+			"bne	1f\n"
+			"li	%0,1\n"
+			"1:\n"
+			: "=&r"(found) : "r"(ea));
+	} else {
+		asm volatile(
+			"tlbsx	0,%1\n"
+			"mfspr	%0,0x271\n"
+			"srwi	%0,%0,31\n"
+			: "=&r"(found) : "r"(ea));
+	}
+
+	return found;
+}
+
+void book3e_hugetlb_preload(struct mm_struct *mm, unsigned long ea, pte_t pte)
+{
+	unsigned long mas1, mas2;
+	u64 mas7_3;
+	unsigned long psize, tsize, shift;
+	unsigned long flags;
+
+#ifdef CONFIG_PPC_FSL_BOOK3E
+	int index, lz, ncams;
+	struct vm_area_struct *vma;
+#endif
+
+	if (unlikely(is_kernel_addr(ea)))
+		return;
+
+#ifdef CONFIG_PPC_MM_SLICES
+	psize = mmu_get_tsize(get_slice_psize(mm, ea));
+	tsize = mmu_get_psize(psize);
+	shift = mmu_psize_defs[psize].shift;
+#else
+	vma = find_vma(mm, ea);
+	psize = vma_mmu_pagesize(vma);	/* returns actual size in bytes */
+	asm (PPC_CNTLZL "%0,%1" : "=r" (lz) : "r" (psize));
+	shift = 31 - lz;
+	tsize = 21 - lz;
+#endif
+
+	/*
+	 * We can't be interrupted while we're setting up the MAS
+	 * regusters or after we've confirmed that no tlb exists.
+	 */
+	local_irq_save(flags);
+
+	if (unlikely(book3e_tlb_exists(ea, mm->context.id))) {
+		local_irq_restore(flags);
+		return;
+	}
+
+#ifdef CONFIG_PPC_FSL_BOOK3E
+	ncams = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
+
+	/* We have to use the CAM(TLB1) on FSL parts for hugepages */
+	index = __get_cpu_var(next_tlbcam_idx);
+	mtspr(SPRN_MAS0, MAS0_ESEL(index) | MAS0_TLBSEL(1));
+
+	/* Just round-robin the entries and wrap when we hit the end */
+	if (unlikely(index == ncams - 1))
+		__get_cpu_var(next_tlbcam_idx) = tlbcam_index;
+	else
+		__get_cpu_var(next_tlbcam_idx)++;
+#endif
+	mas1 = MAS1_VALID | MAS1_TID(mm->context.id) | MAS1_TSIZE(tsize);
+	mas2 = ea & ~((1UL << shift) - 1);
+	mas2 |= (pte_val(pte) >> PTE_WIMGE_SHIFT) & MAS2_WIMGE_MASK;
+	mas7_3 = (u64)pte_pfn(pte) << PAGE_SHIFT;
+	mas7_3 |= (pte_val(pte) >> PTE_BAP_SHIFT) & MAS3_BAP_MASK;
+	if (!pte_dirty(pte))
+		mas7_3 &= ~(MAS3_SW|MAS3_UW);
+
+	mtspr(SPRN_MAS1, mas1);
+	mtspr(SPRN_MAS2, mas2);
+
+	if (mmu_has_feature(MMU_FTR_USE_PAIRED_MAS)) {
+		mtspr(SPRN_MAS7_MAS3, mas7_3);
+	} else {
+		mtspr(SPRN_MAS7, upper_32_bits(mas7_3));
+		mtspr(SPRN_MAS3, lower_32_bits(mas7_3));
+	}
+
+	asm volatile ("tlbwe");
+
+	local_irq_restore(flags);
+}
+
+void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+	struct hstate *hstate = hstate_file(vma->vm_file);
+	unsigned long tsize = huge_page_shift(hstate) - 10;
+
+	__flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, tsize, 0);
+
+}