[RFC PATCH 1/4] powerpc/pseries: Use macros for referring to the DTL enable mask

[Naveen N. Rao]

Introduce macros to encode the DTL enable mask fields and use those
instead of hardcoding numbers.

Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/lppaca.h      | 11 +++++++++++
 arch/powerpc/platforms/pseries/dtl.c   |  8 +-------
 arch/powerpc/platforms/pseries/lpar.c  |  2 +-
 arch/powerpc/platforms/pseries/setup.c |  2 +-
 4 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/include/asm/lppaca.h 
b/arch/powerpc/include/asm/lppaca.h
index 7c23ce8a5a4c..2c7e31187726 100644
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -154,6 +154,17 @@ struct dtl_entry {
 #define DISPATCH_LOG_BYTES     4096    /* bytes per cpu */
 #define N_DISPATCH_LOG         (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
 
+/*
+ * Dispatch trace log event enable mask:
+ *   0x1: voluntary virtual processor waits
+ *   0x2: time-slice preempts
+ *   0x4: virtual partition memory page faults
+ */
+#define DTL_LOG_CEDE           0x1
+#define DTL_LOG_PREEMPT                0x2
+#define DTL_LOG_FAULT          0x4
+#define DTL_LOG_ALL            (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
+
 extern struct kmem_cache *dtl_cache;
 
 /*
diff --git a/arch/powerpc/platforms/pseries/dtl.c 
b/arch/powerpc/platforms/pseries/dtl.c
index 18014cdeb590..e0421aa6eafa 100644
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -40,13 +40,7 @@ struct dtl {
 };
 static DEFINE_PER_CPU(struct dtl, cpu_dtl);
 
-/*
- * Dispatch trace log event mask:
- * 0x7: 0x1: voluntary virtual processor waits
- *      0x2: time-slice preempts
- *      0x4: virtual partition memory page faults
- */
-static u8 dtl_event_mask = 0x7;
+static u8 dtl_event_mask = DTL_LOG_ALL;
 
 
 /*
diff --git a/arch/powerpc/platforms/pseries/lpar.c 
b/arch/powerpc/platforms/pseries/lpar.c
index d3992ced0782..dd024a192512 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -125,7 +125,7 @@ void vpa_init(int cpu)
                        pr_err("WARNING: DTL registration of cpu %d (hw %d) "
                               "failed with %ld\n", smp_processor_id(),
                               hwcpu, ret);
-               lppaca_of(cpu).dtl_enable_mask = 2;
+               lppaca_of(cpu).dtl_enable_mask = DTL_LOG_PREEMPT;
        }
 }
 
diff --git a/arch/powerpc/platforms/pseries/setup.c 
b/arch/powerpc/platforms/pseries/setup.c
index ba1791fd3234..a48cb9757be2 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -293,7 +293,7 @@ static int alloc_dispatch_logs(void)
                pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
                       "with %d\n", smp_processor_id(),
                       hard_smp_processor_id(), ret);
-       get_paca()->lppaca_ptr->dtl_enable_mask = 2;
+       get_paca()->lppaca_ptr->dtl_enable_mask = DTL_LOG_PREEMPT;
 
        return 0;
 }
-- 
2.18.0