[Nouveau] [RFC PATCH 16/29] clk: parse thermal policies for throttling thresholds

[Pierre Moreau]

On 2017-09-15 — 17:11, Karol Herbst wrote:
> v2: use min_t
> 
> Signed-off-by: Karol Herbst <karolherbst at gmail.com>
> ---
>  drm/nouveau/include/nvkm/subdev/clk.h |  2 ++
>  drm/nouveau/nvkm/subdev/clk/base.c    | 42 +++++++++++++++++++++++++++++++++++
>  2 files changed, 44 insertions(+)
> 
> diff --git a/drm/nouveau/include/nvkm/subdev/clk.h b/drm/nouveau/include/nvkm/subdev/clk.h
> index f35518c3..f5ff1fd9 100644
> --- a/drm/nouveau/include/nvkm/subdev/clk.h
> +++ b/drm/nouveau/include/nvkm/subdev/clk.h
> @@ -104,6 +104,8 @@ struct nvkm_clk {
>  	struct nvkm_cstate *cstate;
>  	int exp_cstateid;
>  	u8  temp;
> +	u8  max_temp;
> +	u8  relax_temp;

I guess those should be int, similar to the changes you made in patch 1.

>  
>  	bool allow_reclock;
>  #define NVKM_CLK_BOOST_NONE 0x0
> diff --git a/drm/nouveau/nvkm/subdev/clk/base.c b/drm/nouveau/nvkm/subdev/clk/base.c
> index 54188d2b..54e14936 100644
> --- a/drm/nouveau/nvkm/subdev/clk/base.c
> +++ b/drm/nouveau/nvkm/subdev/clk/base.c
> @@ -27,6 +27,7 @@
>  #include <subdev/bios/boost.h>
>  #include <subdev/bios/cstep.h>
>  #include <subdev/bios/perf.h>
> +#include <subdev/bios/thermal_policies.h>
>  #include <subdev/bios/vpstate.h>
>  #include <subdev/fb.h>
>  #include <subdev/therm.h>
> @@ -659,6 +660,44 @@ nvkm_clk = {
>  	.fini = nvkm_clk_fini,
>  };
>  
> +static void
> +nvkm_clk_parse_max_temp(struct nvkm_clk *clk)
> +{
> +	struct nvkm_subdev *subdev = &clk->subdev;
> +	struct nvkm_bios *bios = subdev->device->bios;
> +	struct nvbios_thermal_policies_header header;
> +	struct nvbios_thermal_policies_entry entry;
> +	u8 i;
> +	s16 mt = 0xff;
> +	s16 rt = 0xff;

Why 0xff? I mean, sure, there is a high possibility that the GPU won’t like
temperatures above 255℃, but still.

> +
> +	if (nvbios_thermal_policies_parse(bios, &header))
> +		return;
> +
> +	if (!header.ecount)
> +		return;
> +
> +	for (i = 0; i < header.ecount; i++) {
> +		if (nvbios_thermal_policies_entry(bios, &header, i, &entry))
> +			return;
> +
> +		if (entry.mode != 1)
> +			continue;
> +
> +		mt = min_t(s16, mt, (entry.t0 + entry.down_offset) / 32);
> +		rt = min_t(s16, rt, (entry.t0 + entry.up_offset) / 32);
> +	}
> +
> +	if (mt == 0xff || rt == 0xff)
> +		return;
> +
> +	clk->max_temp = mt;
> +	clk->relax_temp = rt;
> +
> +	nvkm_debug(subdev, "setting up sw throttling thresholds (%u/%u°C)\n",
> +		   clk->max_temp, clk->relax_temp);
> +}
> +
>  int
>  nvkm_clk_ctor(const struct nvkm_clk_func *func, struct nvkm_device *device,
>  	      int index, bool allow_reclock, struct nvkm_clk *clk)
> @@ -733,6 +772,9 @@ nvkm_clk_ctor(const struct nvkm_clk_func *func, struct nvkm_device *device,
>  
>  	clk->boost_mode = nvkm_longopt(device->cfgopt, "NvBoost",
>  				       NVKM_CLK_BOOST_NONE);
> +
> +	nvkm_clk_parse_max_temp(clk);
> +
>  	return 0;
>  }
>  
> -- 
> 2.14.1
> 
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