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authorScott Wood <scottwood@freescale.com>2015-12-04 16:31:13 -0600
committerScott Wood <scottwood@freescale.com>2015-12-22 18:23:22 -0600
commit2749539b4bf8231b3a20ad759ec8c559ec29292c (patch)
treef4247ef5852f49d1f569a72eb8f880eaeb3855dc
parent9d68e7accf28d0ffe5bf44aae4e64d744fa97337 (diff)
downloadlinux-2749539b4bf8231b3a20ad759ec8c559ec29292c.tar.bz2
powerpc/e6500: add locking to hugetlb
e6500 has threads but does not have TLB write conditional. Thus, the hugetlb code needs to take the same lock that the normal TLB miss handlers take, to ensure that the tlbsx and tlbwe are atomic. Signed-off-by: Scott Wood <scottwood@freescale.com>
-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);
}