[Nouveau] [PATCH 4/4] nouveau/debugfs: add interface for current load

[Ilia Mirkin]

On Mon, Oct 26, 2015 at 2:13 PM, Karol Herbst <nouveau at karolherbst.de> wrote:
> From: Karol Herbst <git at karolherbst.de>
>
> ---
>  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..ddb36e7 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) & 0xff << ((i)*8)) >> ((i)*8))

Is this the same thing as

(v >> (i*8)) & 0xff

? I can't tell if you're attempting to preserve the sign, but don't
see why you'd want to since it all just becomes a u8 anyways.

> +
> +int
> +nvkm_pmu_get_perf_data(struct nvkm_pmu *pmu, struct nvkm_pmu_load_data *data)
> +{
> +       int result[2], ret;

Given the bit manipulations, sounds like result should be (a) unsigned
and (b) sized.

> +       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
>
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