powerpc: Reduce PTE table memory wastage

[firefly-linux-kernel-4.4.55.git] / arch / powerpc / include / asm / mmu-hash64.h

diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index b59e06f507ea6c3f3af39688752e20a23096b666..de9e577f329c3bc43e4e16a35a3fb5553e6599d6 100644 (file)
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -21,6 +21,7 @@
  * complete pgtable.h but only a portion of it.
  */
 #include <asm/pgtable-ppc64.h>
+#include <asm/bug.h>
 
 /*
  * Segment table
@@ -159,6 +160,24 @@ struct mmu_psize_def
        unsigned long   avpnm;  /* bits to mask out in AVPN in the HPTE */
        unsigned long   sllp;   /* SLB L||LP (exact mask to use in slbmte) */
 };
+extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
+
+static inline int shift_to_mmu_psize(unsigned int shift)
+{
+       int psize;
+
+       for (psize = 0; psize < MMU_PAGE_COUNT; ++psize)
+               if (mmu_psize_defs[psize].shift == shift)
+                       return psize;
+       return -1;
+}
+
+static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize)
+{
+       if (mmu_psize_defs[mmu_psize].shift)
+               return mmu_psize_defs[mmu_psize].shift;
+       BUG();
+}
 
 #endif /* __ASSEMBLY__ */
 
@@ -193,7 +212,6 @@ static inline int segment_shift(int ssize)
 /*
  * The current system page and segment sizes
  */
-extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
 extern int mmu_linear_psize;
 extern int mmu_virtual_psize;
 extern int mmu_vmalloc_psize;
@@ -498,6 +516,10 @@ typedef struct {
        unsigned long acop;     /* mask of enabled coprocessor types */
        unsigned int cop_pid;   /* pid value used with coprocessors */
 #endif /* CONFIG_PPC_ICSWX */
+#ifdef CONFIG_PPC_64K_PAGES
+       /* for 4K PTE fragment support */
+       void *pte_frag;
+#endif
 } mm_context_t;