this can be run alongside the nvidia driver and it usefull to actually check
that nouveau would set the right voltage with the same clocks set

Signed-off-by: Karol Herbst <nouv...@karolherbst.de>
---
 bin/nv_cmp_volt.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 bin/nv_cmp_volt.c

diff --git a/bin/nv_cmp_volt.c b/bin/nv_cmp_volt.c
new file mode 100644
index 0000000..35440dd
--- /dev/null
+++ b/bin/nv_cmp_volt.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016 Karol Herbst
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Karol Herbst
+ */
+
+#include <nvif/client.h>
+#include <nvif/device.h>
+#include <nvif/class.h>
+
+#include <nvkm/subdev/volt.h>
+
+#include "util.h"
+
+int
+main(int argc, char **argv)
+{
+       struct nvif_client if_client;
+       struct nvif_device if_device;
+       struct nvkm_clk *clk;
+       struct nvkm_volt *volt;
+       struct nvkm_device *device;
+       int ret;
+       int old_voltage = 0, old_nouveau_voltage = 0, old_pstate = 0, 
old_cstate = 0, old_temp = 0;
+
+       ret = u_device("lib", argv[0], "error", true, true,
+                       (1ULL << NVKM_SUBDEV_CLK) |
+//                       (1ULL << NVKM_SUBDEV_FUSE) |
+                       (1ULL << NVKM_SUBDEV_GPIO) |
+//                       (1ULL << NVKM_SUBDEV_I2C) |
+                       (1ULL << NVKM_SUBDEV_PCI) |
+//                       (1ULL << NVKM_SUBDEV_THERM) |
+//                       (1ULL << NVKM_SUBDEV_TIMER) |
+                       (1ULL << NVKM_SUBDEV_VBIOS) |
+                       (1ULL << NVKM_SUBDEV_VOLT),
+                       0x00000000, &if_client, &if_device);
+
+       if (ret < 0)
+               return ret;
+
+       device = nvxx_device(&if_device);
+       clk = device->clk;
+//     therm = device->therm;
+       volt = device->volt;
+
+       printf("current voltage (µV), expected voltage (µV), abs diff (µV), rel 
diff nouveau/nvidia (%%), pstate, cstate, temperature (°C)\n");
+       while (true) {
+               int gpc_clock = nvkm_clk_read(clk, nv_clk_src_gpc);
+               int mem_clock = nvkm_clk_read(clk, nv_clk_src_mem);
+               struct nvkm_pstate *pstate = NULL, *best_pstate = NULL;
+               struct nvkm_cstate *cstate = NULL, *best_cstate = NULL;
+               int mem_err, gpc_err;
+               int new_voltage, new_nouveau_voltage, new_pstate, new_cstate, 
new_temp;
+
+               list_for_each_entry(pstate, &clk->states, head) {
+                       list_for_each_entry(cstate, &pstate->list, head) {
+                               if (!best_pstate) {
+                                       best_pstate = pstate;
+                                       best_cstate = cstate;
+                                       gpc_err = 
abs(cstate->domain[nv_clk_src_gpc] - gpc_clock);
+                                       mem_err = 
abs(cstate->domain[nv_clk_src_mem] - mem_clock);
+                                       continue;
+                               }
+
+                               if (abs(cstate->domain[nv_clk_src_gpc] - 
gpc_clock) <= gpc_err &&
+                                   abs(cstate->domain[nv_clk_src_mem] - 
mem_clock) <= mem_err) {
+                                       best_pstate = pstate;
+                                       best_cstate = cstate;
+                                       gpc_err = 
abs(cstate->domain[nv_clk_src_gpc] - gpc_clock);
+                                       mem_err = 
abs(cstate->domain[nv_clk_src_mem] - mem_clock);
+                               }
+                       }
+               }
+
+               new_voltage = nvkm_volt_get(volt);
+               new_temp = nvkm_rd32(device, 
0x20400);//nvkm_therm_temp_get(therm);
+               new_nouveau_voltage = max(nvkm_volt_map(volt, 
best_cstate->voltage), nvkm_volt_map(volt, best_pstate->base.voltage));
+               new_pstate = best_pstate->pstate;
+               new_cstate = best_cstate->cstate;
+
+               if (new_voltage != old_voltage || new_nouveau_voltage != 
old_nouveau_voltage || new_pstate != old_pstate || new_cstate != old_cstate || 
new_temp != old_temp) {
+                       old_voltage = new_voltage;
+                       old_nouveau_voltage = new_nouveau_voltage;
+                       old_pstate = new_pstate;
+                       old_cstate = new_cstate;
+                       old_temp = new_temp;
+                       printf("%i, %i, %i, %f, %i, %i, %i\n",
+                               new_voltage, new_nouveau_voltage, 
new_nouveau_voltage - new_voltage, 100 * (double)new_nouveau_voltage / 
new_voltage, new_pstate, new_cstate, new_temp);
+               }
+               usleep(100000);
+       }
+
+       return 0;
+}
-- 
2.7.2

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