cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vpstate.c (2642B)

      1/*
      2 * Copyright 2016 Karol Herbst
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Karol Herbst
     23 */
     24#include <subdev/bios.h>
     25#include <subdev/bios/bit.h>
     26#include <subdev/bios/vpstate.h>
     27
     28static u32
     29nvbios_vpstate_offset(struct nvkm_bios *b)
     30{
     31	struct bit_entry bit_P;
     32
     33	if (!bit_entry(b, 'P', &bit_P)) {
     34		if (bit_P.version == 2 && bit_P.length >= 0x3c)
     35			return nvbios_rd32(b, bit_P.offset + 0x38);
     36	}
     37
     38	return 0x0000;
     39}
     40
     41int
     42nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
     43{
     44	if (!h)
     45		return -EINVAL;
     46
     47	h->offset = nvbios_vpstate_offset(b);
     48	if (!h->offset)
     49		return -ENODEV;
     50
     51	h->version = nvbios_rd08(b, h->offset);
     52	switch (h->version) {
     53	case 0x10:
     54		h->hlen     = nvbios_rd08(b, h->offset + 0x1);
     55		h->elen     = nvbios_rd08(b, h->offset + 0x2);
     56		h->slen     = nvbios_rd08(b, h->offset + 0x3);
     57		h->scount   = nvbios_rd08(b, h->offset + 0x4);
     58		h->ecount   = nvbios_rd08(b, h->offset + 0x5);
     59
     60		h->base_id  = nvbios_rd08(b, h->offset + 0x0f);
     61		if (h->hlen > 0x10)
     62			h->boost_id = nvbios_rd08(b, h->offset + 0x10);
     63		else
     64			h->boost_id = 0xff;
     65		if (h->hlen > 0x11)
     66			h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
     67		else
     68			h->tdp_id = 0xff;
     69		return 0;
     70	default:
     71		return -EINVAL;
     72	}
     73}
     74
     75int
     76nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
     77		     u8 idx, struct nvbios_vpstate_entry *e)
     78{
     79	u32 offset;
     80
     81	if (!e || !h || idx > h->ecount)
     82		return -EINVAL;
     83
     84	offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
     85	e->pstate    = nvbios_rd08(b, offset);
     86	e->clock_mhz = nvbios_rd16(b, offset + 0x5);
     87	return 0;
     88}