Commit e5f8eabc authored by Karol Herbst's avatar Karol Herbst Committed by Ben Skeggs
Browse files

drm/nouveau/bios/power_budget: Add basic power budget parsing 



v2: Set entry to 0xff if not found
    Add cap entry for ver 0x30 tables
    Rework to fix memory leak
v3: More error checks
    Simplify check for invalid entries
v4: disable for ver 0x10 for now
    move assignments after the second last return

Signed-off-by: default avatarKarol Herbst <karolherbst@gmail.com>
Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 75d115f2

drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/power_budget.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
#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 {

	u32 offset;

	u8  ver;

	u8  hlen;

	u8  elen;

	u8  ecount;

	u8  cap_entry;

};



int nvbios_power_budget_header(struct nvkm_bios *,

                               struct nvbios_power_budget *);

int nvbios_power_budget_entry(struct nvkm_bios *, struct nvbios_power_budget *,

                              u8 idx, struct nvbios_power_budget_entry *);



#endif

drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c

0 → 100644
+126 −0
Original line number Diff line number Diff line 
/*

 * 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 <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 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_header(struct nvkm_bios *bios,

                           struct nvbios_power_budget *budget)

{

	struct nvkm_subdev *subdev = &bios->subdev;

	u8 ver, hdr, cnt, len, cap_entry;

	u32 header;



	if (!bios || !budget)

		return -EINVAL;



	header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);

	if (!header || !cnt)

		return -ENODEV;



	switch (ver) {

	case 0x20:

		cap_entry = nvbios_rd08(bios, header + 0x9);

		break;

	case 0x30:

		cap_entry = nvbios_rd08(bios, header + 0xa);

		break;

	default:

		cap_entry = 0xff;

	}



	if (cap_entry >= cnt && cap_entry != 0xff) {

		nvkm_warn(subdev,

		          "invalid cap_entry in power budget table found\n");

		budget->cap_entry = 0xff;

		return -EINVAL;

	}



	budget->offset = header;

	budget->ver = ver;

	budget->hlen = hdr;

	budget->elen = len;

	budget->ecount = cnt;



	budget->cap_entry = cap_entry;



	return 0;

}



int

nvbios_power_budget_entry(struct nvkm_bios *bios,

                          struct nvbios_power_budget *budget,

                          u8 idx, struct nvbios_power_budget_entry *entry)

{

	u32 entry_offset;



	if (!bios || !budget || !budget->offset || idx >= budget->ecount

		|| !entry)

		return -EINVAL;



	entry_offset = budget->offset + budget->hlen + idx * budget->elen;



	if (budget->ver >= 0x20) {

		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;

}

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