[Nouveau] [PATCH 1/3] nvbios/power_budget: Add basic power budget parsing

[Martin Peres]

On 25/10/16 00:11, Karol Herbst wrote:
> Signed-off-by: Karol Herbst <karolherbst at gmail.com>
> ---
>  .../include/nvkm/subdev/bios/power_budget.h        |  20 ++++
>  drm/nouveau/nvkm/subdev/bios/Kbuild                |   1 +
>  drm/nouveau/nvkm/subdev/bios/power_budget.c        | 108 +++++++++++++++++++++
>  3 files changed, 129 insertions(+)
>  create mode 100644 drm/nouveau/include/nvkm/subdev/bios/power_budget.h
>  create mode 100644 drm/nouveau/nvkm/subdev/bios/power_budget.c
>
> diff --git a/drm/nouveau/include/nvkm/subdev/bios/power_budget.h b/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
> new file mode 100644
> index 0000000..dd65c08
> --- /dev/null
> +++ b/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
> @@ -0,0 +1,20 @@
> +#ifndef __NVBIOS_POWER_BUDGET_H__
> +#define __NVBIOS_POWER_BUDGET_H__
> +
> +#include <nvkm/subdev/bios.h>
> +
> +struct nvbios_power_budget_entry {
> +	u32 min_w;
> +	u32 avg_w;
> +	u32 max_w;
> +};
> +
> +struct nvbios_power_budget {
> +	u8  nr_entry;
> +	u8  cap_entry;
> +	struct nvbios_power_budget_entry *entries;
> +};
> +
> +int nvbios_power_budget_parse(struct nvkm_bios *, struct nvbios_power_budget *);
> +
> +#endif
> diff --git a/drm/nouveau/nvkm/subdev/bios/Kbuild b/drm/nouveau/nvkm/subdev/bios/Kbuild
> index be57220..6b4f1e0 100644
> --- a/drm/nouveau/nvkm/subdev/bios/Kbuild
> +++ b/drm/nouveau/nvkm/subdev/bios/Kbuild
> @@ -19,6 +19,7 @@ nvkm-y += nvkm/subdev/bios/pcir.o
>  nvkm-y += nvkm/subdev/bios/perf.o
>  nvkm-y += nvkm/subdev/bios/pll.o
>  nvkm-y += nvkm/subdev/bios/pmu.o
> +nvkm-y += nvkm/subdev/bios/power_budget.o
>  nvkm-y += nvkm/subdev/bios/ramcfg.o
>  nvkm-y += nvkm/subdev/bios/rammap.o
>  nvkm-y += nvkm/subdev/bios/shadow.o
> diff --git a/drm/nouveau/nvkm/subdev/bios/power_budget.c b/drm/nouveau/nvkm/subdev/bios/power_budget.c
> new file mode 100644
> index 0000000..538497b
> --- /dev/null
> +++ b/drm/nouveau/nvkm/subdev/bios/power_budget.c
> @@ -0,0 +1,108 @@
> +/*
> + * Copyright 2015 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 <subdev/bios.h>
> +#include <subdev/bios/bit.h>
> +#include <subdev/bios/power_budget.h>
> +
> +static u32
> +nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
> +			  u8 *len)
> +{
> +	struct bit_entry bit_P;
> +	u32 power_budget;
> +
> +	if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
> +	    bit_P.length < 0x2c)
> +		return 0;
> +
> +	power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
> +	if (!power_budget)
> +		return 0;
> +
> +	*ver = nvbios_rd08(bios, power_budget);
> +	switch (*ver) {
> +	case 0x10:
> +	case 0x20:
> +	case 0x30:
> +		*hdr = nvbios_rd08(bios, power_budget + 0x1);
> +		*len = nvbios_rd08(bios, power_budget + 0x2);
> +		*cnt = nvbios_rd08(bios, power_budget + 0x3);
> +		return power_budget;
> +	default:
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
> +int
> +nvbios_power_budget_parse(struct nvkm_bios *bios, struct nvbios_power_budget *budget)
> +{
> +	struct nvkm_subdev *subdev = &bios->subdev;
> +	u8 ver, hdr, cnt, len, i, cap_entry;
> +	u32 header;
> +
> +	header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
> +	if (!header || !cnt)
> +		return -ENODEV;
> +
> +	budget->entries = kmalloc_array(cnt, sizeof(*budget->entries), GFP_KERNEL);
> +	if (!budget->entries)
> +		return -ENOMEM;
> +
> +	budget->nr_entry = cnt;
> +	switch (ver) {
> +	case 0x20:
> +		cap_entry = nvbios_rd08(bios, header + 0x9);
> +		break;
> +	default:
> +		cap_entry = 0;

Are you sure about this? How about setting it to 0xff instead?

> +	}
> +
> +	if (cap_entry < cnt)
> +		budget->cap_entry = cap_entry;
> +	else {
> +		if (cap_entry != 0xff)
> +			nvkm_warn(subdev,
> +				  "invalid cap_entry in power budget table found\n");
> +		budget->cap_entry = 0xff;
> +	}
> +
> +	for (i = 0; i < cnt; ++i) {
> +		u32 entry_offset = header + hdr + i * len;
> +		struct nvbios_power_budget_entry *entry = &budget->entries[i];
> +
> +		if (len >= 0xe) {
> +			entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
> +			entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
> +			entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
> +		} else {
> +			entry->min_w = 0;
> +			entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
> +			entry->avg_w = entry->max_w;
> +		}
> +	}
> +
> +	return 0;
> +}
>