Nouveau - Oct 2015 - [PATCH v3 4/4] nouveau/debugfs: add interface for current load

From: Karol Herbst <git at karolherbst.de>

v2: optimize macro and fixed data array type
v3: fix bug I added in the last version

---
 drm/nouveau/include/nvif/device.h     |  1 +
 drm/nouveau/include/nvkm/subdev/pmu.h | 10 ++++++++++
 drm/nouveau/nouveau_debugfs.c         | 23 +++++++++++++++++++++++
 drm/nouveau/nvkm/subdev/pmu/base.c    | 18 ++++++++++++++++++
 4 files changed, 52 insertions(+)

diff --git a/drm/nouveau/include/nvif/device.h
b/drm/nouveau/include/nvif/device.h
index 700a9b2..d289fdf 100644
--- a/drm/nouveau/include/nvif/device.h
+++ b/drm/nouveau/include/nvif/device.h
@@ -63,6 +63,7 @@ u64  nvif_device_time(struct nvif_device *);
 #define nvxx_clk(a) nvxx_device(a)->clk
 #define nvxx_i2c(a) nvxx_device(a)->i2c
 #define nvxx_therm(a) nvxx_device(a)->therm
+#define nvxx_pmu(a) nvxx_device(a)->pmu
 
 #include <core/device.h>
 #include <engine/fifo.h>
diff --git a/drm/nouveau/include/nvkm/subdev/pmu.h
b/drm/nouveau/include/nvkm/subdev/pmu.h
index e61923d..be3c60e 100644
--- a/drm/nouveau/include/nvkm/subdev/pmu.h
+++ b/drm/nouveau/include/nvkm/subdev/pmu.h
@@ -23,6 +23,13 @@ struct nvkm_pmu {
 	} recv;
 };
 
+struct nvkm_pmu_load_data {
+	u8 core;
+	u8 mem;
+	u8 video;
+	u8 pcie;
+};
+
 int nvkm_pmu_send(struct nvkm_pmu *, u32 reply[2], u32 process,
 		  u32 message, u32 data0, u32 data1);
 void nvkm_pmu_pgob(struct nvkm_pmu *, bool enable);
@@ -48,4 +55,7 @@ void nvkm_memx_train(struct nvkm_memx *);
 int  nvkm_memx_train_result(struct nvkm_pmu *, u32 *, int);
 void nvkm_memx_block(struct nvkm_memx *);
 void nvkm_memx_unblock(struct nvkm_memx *);
+
+/* interface to PERF process running on PMU */
+int nvkm_pmu_get_perf_data(struct nvkm_pmu *, struct nvkm_pmu_load_data *);
 #endif
diff --git a/drm/nouveau/nouveau_debugfs.c b/drm/nouveau/nouveau_debugfs.c
index 5392e07..ec3d3d3 100644
--- a/drm/nouveau/nouveau_debugfs.c
+++ b/drm/nouveau/nouveau_debugfs.c
@@ -28,6 +28,8 @@
  *  Ben Skeggs <bskeggs at redhat.com>
  */
 
+#include <nvkm/subdev/pmu.h>
+
 #include "nouveau_debugfs.h"
 #include "nouveau_drm.h"
 
@@ -43,8 +45,29 @@ nouveau_debugfs_vbios_image(struct seq_file *m, void *data)
 	return 0;
 }
 
+static int
+nouveau_debugfs_current_load(struct seq_file *m, void *data)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct nouveau_drm *drm = nouveau_drm(node->minor->dev);
+	struct nvkm_pmu *pmu = nvxx_pmu(&drm->device);
+	struct nvkm_pmu_load_data load_data;
+	int ret;
+
+	ret = nvkm_pmu_get_perf_data(pmu, &load_data);
+	if (ret < 0)
+		return ret;
+
+	seq_printf(m, "core: %i\n", load_data.core);
+	seq_printf(m, "mem: %i\n", load_data.mem);
+	seq_printf(m, "video: %i\n", load_data.video);
+	seq_printf(m, "pcie: %i\n", load_data.pcie);
+	return 0;
+}
+
 static struct drm_info_list nouveau_debugfs_list[] = {
 	{ "vbios.rom", nouveau_debugfs_vbios_image, 0, NULL },
+	{ "current_load", nouveau_debugfs_current_load, 0, NULL },
 };
 #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)
 
diff --git a/drm/nouveau/nvkm/subdev/pmu/base.c
b/drm/nouveau/nvkm/subdev/pmu/base.c
index d95eb86..6594812 100644
--- a/drm/nouveau/nvkm/subdev/pmu/base.c
+++ b/drm/nouveau/nvkm/subdev/pmu/base.c
@@ -140,6 +140,24 @@ nvkm_pmu_recv(struct work_struct *work)
 		  process, message, data0, data1);
 }
 
+#define get_counter_index(v, i) (((v) >> ((i)*8)) & 0xff)
+
+int
+nvkm_pmu_get_perf_data(struct nvkm_pmu *pmu, struct nvkm_pmu_load_data *data)
+{
+	u32 result[2];
+
+	int ret = nvkm_pmu_send(pmu, result, PROC_PERF, PERF_MSG_LOAD, 0, 0);
+	if (ret < 0)
+		return ret;
+
+	data->core = get_counter_index(result[0], 0);
+	data->video = get_counter_index(result[0], 1);
+	data->mem = get_counter_index(result[0], 2);
+	data->pcie = get_counter_index(result[0], 3);
+	return 0;
+}
+
 static void
 nvkm_pmu_intr(struct nvkm_subdev *subdev)
 {
-- 
2.6.2