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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /arch/powerpc/mm/hugetlbpage-book3e.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage-book3e.c')
-rw-r--r--arch/powerpc/mm/hugetlbpage-book3e.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hugetlbpage-book3e.c b/arch/powerpc/mm/hugetlbpage-book3e.c
index ba47aaf33..83a8be791 100644
--- a/arch/powerpc/mm/hugetlbpage-book3e.c
+++ b/arch/powerpc/mm/hugetlbpage-book3e.c
@@ -8,6 +8,8 @@
#include <linux/mm.h>
#include <linux/hugetlb.h>
+#include <asm/mmu.h>
+
#ifdef CONFIG_PPC_FSL_BOOK3E
#ifdef CONFIG_PPC64
static inline int tlb1_next(void)
@@ -51,6 +53,59 @@ 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;
+
+ /*
+ * Besides being unnecessary in the absence of SMT, this
+ * check prevents trying to do lbarx/stbcx. on e5500 which
+ * doesn't implement either feature.
+ */
+ if (!cpu_has_feature(CPU_FTR_SMT))
+ return;
+
+ 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();
+
+ if (!cpu_has_feature(CPU_FTR_SMT))
+ return;
+
+ 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 +164,10 @@ 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 +199,7 @@ void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
asm volatile ("tlbwe");
+ book3e_tlb_unlock();
local_irq_restore(flags);
}