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-rw-r--r--arch/powerpc/mm/slb_low.S52
1 files changed, 33 insertions, 19 deletions
diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index b10e4707d7c..cd1a93d4948 100644
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -82,31 +82,45 @@ _GLOBAL(slb_miss_kernel_load_io)
srdi. r9,r10,USER_ESID_BITS
bne- 8f /* invalid ea bits set */
- /* Figure out if the segment contains huge pages */
-#ifdef CONFIG_HUGETLB_PAGE
-BEGIN_FTR_SECTION
- b 1f
-END_FTR_SECTION_IFCLR(CPU_FTR_16M_PAGE)
+
+ /* when using slices, we extract the psize off the slice bitmaps
+ * and then we need to get the sllp encoding off the mmu_psize_defs
+ * array.
+ *
+ * XXX This is a bit inefficient especially for the normal case,
+ * so we should try to implement a fast path for the standard page
+ * size using the old sllp value so we avoid the array. We cannot
+ * really do dynamic patching unfortunately as processes might flip
+ * between 4k and 64k standard page size
+ */
+#ifdef CONFIG_PPC_MM_SLICES
cmpldi r10,16
- lhz r9,PACALOWHTLBAREAS(r13)
- mr r11,r10
+ /* Get the slice index * 4 in r11 and matching slice size mask in r9 */
+ ld r9,PACALOWSLICESPSIZE(r13)
+ sldi r11,r10,2
blt 5f
+ ld r9,PACAHIGHSLICEPSIZE(r13)
+ srdi r11,r10,(SLICE_HIGH_SHIFT - SLICE_LOW_SHIFT - 2)
+ andi. r11,r11,0x3c
- lhz r9,PACAHIGHHTLBAREAS(r13)
- srdi r11,r10,(HTLB_AREA_SHIFT-SID_SHIFT)
-
-5: srd r9,r9,r11
- andi. r9,r9,1
- beq 1f
-_GLOBAL(slb_miss_user_load_huge)
- li r11,0
- b 2f
-1:
-#endif /* CONFIG_HUGETLB_PAGE */
+5: /* Extract the psize and multiply to get an array offset */
+ srd r9,r9,r11
+ andi. r9,r9,0xf
+ mulli r9,r9,MMUPSIZEDEFSIZE
+ /* Now get to the array and obtain the sllp
+ */
+ ld r11,PACATOC(r13)
+ ld r11,mmu_psize_defs@got(r11)
+ add r11,r11,r9
+ ld r11,MMUPSIZESLLP(r11)
+ ori r11,r11,SLB_VSID_USER
+#else
+ /* paca context sllp already contains the SLB_VSID_USER bits */
lhz r11,PACACONTEXTSLLP(r13)
-2:
+#endif /* CONFIG_PPC_MM_SLICES */
+
ld r9,PACACONTEXTID(r13)
rldimi r10,r9,USER_ESID_BITS,0
b slb_finish_load