powerpc: Create next_tlbcam_idx percpu variable for FSL_BOOKE

This is used to round-robin TLBCAM entries.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

4 files changed, 24 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index 4138b21ae80..b427a55ce2a 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -115,6 +115,11 @@
 #ifndef __ASSEMBLY__
 #include <asm/cputable.h>
 
+#ifdef CONFIG_PPC_FSL_BOOK3E
+#include <asm/percpu.h>
+DECLARE_PER_CPU(int, next_tlbcam_idx);
+#endif
+
 static inline int mmu_has_feature(unsigned long feature)
 {
         return (cur_cpu_spec->mmu_features & feature);
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 6c8e739a12d..567a1746ed7 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -305,6 +305,10 @@ struct thread_info *current_set[NR_CPUS];
 static void __devinit smp_store_cpu_info(int id)
 {
         per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
+#ifdef CONFIG_PPC_FSL_BOOK3E
+        per_cpu(next_tlbcam_idx, id)
+                = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
+#endif
 }
 
 void __init smp_prepare_cpus(unsigned int max_cpus)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index a3841bb75cb..457dc84154b 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -353,6 +353,15 @@ void __init mem_init(void)
         }
 #endif /* CONFIG_HIGHMEM */
 
+#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
+        /*
+         * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
+         * functions.... do it here for the non-smp case.
+         */
+        per_cpu(next_tlbcam_idx, smp_processor_id()) =
+                (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
+#endif
+
         printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
                "%luk reserved, %luk data, %luk bss, %luk init)\n",
                 nr_free_pages() << (PAGE_SHIFT-10),
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index 3722185d186..e80ed1093e2 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -102,6 +102,12 @@ unsigned long linear_map_top;	/* Top of linear mapping */
 
 #endif /* CONFIG_PPC64 */
 
+#ifdef CONFIG_PPC_FSL_BOOK3E
+/* next_tlbcam_idx is used to round-robin tlbcam entry assignment */
+DEFINE_PER_CPU(int, next_tlbcam_idx);
+EXPORT_PER_CPU_SYMBOL(next_tlbcam_idx);
+#endif
+
 /*
  * Base TLB flushing operations:
  *