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-rw-r--r--arch/powerpc/mm/hugetlbpage-book3e.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hugetlbpage-book3e.c b/arch/powerpc/mm/hugetlbpage-book3e.c
index ba47aaf33a4b..7e6d0880813f 100644
--- a/arch/powerpc/mm/hugetlbpage-book3e.c
+++ b/arch/powerpc/mm/hugetlbpage-book3e.c
@@ -51,6 +51,48 @@ static inline int mmu_get_tsize(int psize)
return mmu_psize_defs[psize].enc;
}
+#if defined(CONFIG_PPC_FSL_BOOK3E) && defined(CONFIG_PPC64)
+#include <asm/paca.h>
+
+static inline void book3e_tlb_lock(void)
+{
+ struct paca_struct *paca = get_paca();
+ unsigned long tmp;
+ int token = smp_processor_id() + 1;
+
+ asm volatile("1: lbarx %0, 0, %1;"
+ "cmpwi %0, 0;"
+ "bne 2f;"
+ "stbcx. %2, 0, %1;"
+ "bne 1b;"
+ "b 3f;"
+ "2: lbzx %0, 0, %1;"
+ "cmpwi %0, 0;"
+ "bne 2b;"
+ "b 1b;"
+ "3:"
+ : "=&r" (tmp)
+ : "r" (&paca->tcd_ptr->lock), "r" (token)
+ : "memory");
+}
+
+static inline void book3e_tlb_unlock(void)
+{
+ struct paca_struct *paca = get_paca();
+
+ isync();
+ paca->tcd_ptr->lock = 0;
+}
+#else
+static inline void book3e_tlb_lock(void)
+{
+}
+
+static inline void book3e_tlb_unlock(void)
+{
+}
+#endif
+
static inline int book3e_tlb_exists(unsigned long ea, unsigned long pid)
{
int found = 0;
@@ -109,7 +151,10 @@ void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
*/
local_irq_save(flags);
+ book3e_tlb_lock();
+
if (unlikely(book3e_tlb_exists(ea, mm->context.id))) {
+ book3e_tlb_unlock();
local_irq_restore(flags);
return;
}
@@ -141,6 +186,7 @@ void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
asm volatile ("tlbwe");
+ book3e_tlb_unlock();
local_irq_restore(flags);
}