cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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common_baco.c (3440B)

      1/*
      2 * Copyright 2018 Advanced Micro Devices, Inc.
      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 */
     23
     24#include "common_baco.h"
     25
     26
     27static bool baco_wait_register(struct pp_hwmgr *hwmgr, u32 reg, u32 mask, u32 value)
     28{
     29	struct amdgpu_device *adev = (struct amdgpu_device *)(hwmgr->adev);
     30	u32 timeout = 5000, data;
     31
     32	do {
     33		msleep(1);
     34		data = RREG32(reg);
     35		timeout--;
     36	} while (value != (data & mask) && (timeout != 0));
     37
     38	if (timeout == 0)
     39		return false;
     40
     41	return true;
     42}
     43
     44static bool baco_cmd_handler(struct pp_hwmgr *hwmgr, u32 command, u32 reg, u32 mask,
     45			        u32 shift, u32 value, u32 timeout)
     46{
     47	struct amdgpu_device *adev = (struct amdgpu_device *)(hwmgr->adev);
     48	u32 data;
     49	bool ret = true;
     50
     51	switch (command) {
     52	case CMD_WRITE:
     53		WREG32(reg, value << shift);
     54		break;
     55	case CMD_READMODIFYWRITE:
     56		data = RREG32(reg);
     57		data = (data & (~mask)) | (value << shift);
     58		WREG32(reg, data);
     59		break;
     60	case CMD_WAITFOR:
     61		ret = baco_wait_register(hwmgr, reg, mask, value);
     62		break;
     63	case CMD_DELAY_MS:
     64		if (timeout)
     65			/* Delay in milli Seconds */
     66			msleep(timeout);
     67		break;
     68	case CMD_DELAY_US:
     69		if (timeout)
     70			/* Delay in micro Seconds */
     71			udelay(timeout);
     72		break;
     73
     74	default:
     75		dev_warn(adev->dev, "Invalid BACO command.\n");
     76		ret = false;
     77	}
     78
     79	return ret;
     80}
     81
     82bool baco_program_registers(struct pp_hwmgr *hwmgr,
     83			    const struct baco_cmd_entry *entry,
     84			    const u32 array_size)
     85{
     86	u32 i, reg = 0;
     87
     88	for (i = 0; i < array_size; i++) {
     89		if ((entry[i].cmd == CMD_WRITE) ||
     90		    (entry[i].cmd == CMD_READMODIFYWRITE) ||
     91		    (entry[i].cmd == CMD_WAITFOR))
     92			reg = entry[i].reg_offset;
     93		if (!baco_cmd_handler(hwmgr, entry[i].cmd, reg, entry[i].mask,
     94				     entry[i].shift, entry[i].val, entry[i].timeout))
     95			return false;
     96	}
     97
     98	return true;
     99}
    100
    101bool soc15_baco_program_registers(struct pp_hwmgr *hwmgr,
    102				 const struct soc15_baco_cmd_entry *entry,
    103				 const u32 array_size)
    104{
    105	struct amdgpu_device *adev = (struct amdgpu_device *)(hwmgr->adev);
    106	u32 i, reg = 0;
    107
    108	for (i = 0; i < array_size; i++) {
    109		if ((entry[i].cmd == CMD_WRITE) ||
    110		    (entry[i].cmd == CMD_READMODIFYWRITE) ||
    111		    (entry[i].cmd == CMD_WAITFOR))
    112			reg = adev->reg_offset[entry[i].hwip][entry[i].inst][entry[i].seg]
    113				+ entry[i].reg_offset;
    114		if (!baco_cmd_handler(hwmgr, entry[i].cmd, reg, entry[i].mask,
    115				     entry[i].shift, entry[i].val, entry[i].timeout))
    116			return false;
    117	}
    118
    119	return true;
    120}