gpu: nvgpu: Read all fields of device_info

We were not using the engine_type field in device info, and the code
did not handle chained entries properly. The code assumed that first
entry is for graphics and second for CE, which is not always true.

Improve the code to go through all entries of device_info, and
preserve values across entries until we reach the last entry.
Only last entry triggers a write to fifo engine info.

There can also be multiple engines with same type, so accumulate
interrupts and reset ids from all of them.

As the code got fixed, now it reads the engine enum correctly from
hardware. We used to compare that against CE0, but we should compare
against CE2.

gk20a_fifo_reset_engine() uses wrong constants - it is passed a
internal numbering of engines, but it compares them against hardware
engine enum.

Change-Id: Ia59273921c602d2a090f7a5b1404afb0fca2532c
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1147746
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>

1 files changed, 25 insertions, 5 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/hw_top_gk20a.h b/drivers/gpu/nvgpu/gk20a/hw_top_gk20a.h
index 35d9d347..6981cf71 100644
--- a/drivers/gpu/nvgpu/gk20a/hw_top_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/hw_top_gk20a.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2015, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2012-2016, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -118,13 +118,29 @@ static inline u32 top_device_info_type_enum_graphics_f(void)
 {
         return 0x0;
 }
-static inline u32 top_device_info_type_enum_copy0_v(void)
+static inline u32 top_device_info_type_enum_copy2_v(void)
 {
-        return 0x00000001;
+        return 0x00000003;
+}
+static inline u32 top_device_info_type_enum_copy2_f(void)
+{
+        return 0xc;
 }
-static inline u32 top_device_info_type_enum_copy0_f(void)
+static inline u32 top_device_info_engine_v(u32 r)
 {
-        return 0x4;
+        return (r >> 5) & 0x1;
+}
+static inline u32 top_device_info_runlist_v(u32 r)
+{
+        return (r >> 4) & 0x1;
+}
+static inline u32 top_device_info_intr_v(u32 r)
+{
+        return (r >> 3) & 0x1;
+}
+static inline u32 top_device_info_reset_v(u32 r)
+{
+        return (r >> 2) & 0x1;
 }
 static inline u32 top_device_info_entry_v(u32 r)
 {
@@ -138,6 +154,10 @@ static inline u32 top_device_info_entry_enum_v(void)
 {
         return 0x00000002;
 }
+static inline u32 top_device_info_entry_engine_type_v(void)
+{
+        return 0x00000003;
+}
 static inline u32 top_fs_status_fbp_r(void)
 {
         return 0x00022548;