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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adf_pfvf_utils.c (1699B)

      1// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
      2/* Copyright(c) 2021 Intel Corporation */
      3#include <linux/crc8.h>
      4#include <linux/pci.h>
      5#include <linux/types.h>
      6#include "adf_accel_devices.h"
      7#include "adf_pfvf_msg.h"
      8#include "adf_pfvf_utils.h"
      9
     10/* CRC Calculation */
     11DECLARE_CRC8_TABLE(pfvf_crc8_table);
     12#define ADF_PFVF_CRC8_POLYNOMIAL 0x97
     13
     14void adf_pfvf_crc_init(void)
     15{
     16	crc8_populate_msb(pfvf_crc8_table, ADF_PFVF_CRC8_POLYNOMIAL);
     17}
     18
     19u8 adf_pfvf_calc_blkmsg_crc(u8 const *buf, u8 buf_len)
     20{
     21	return crc8(pfvf_crc8_table, buf, buf_len, CRC8_INIT_VALUE);
     22}
     23
     24static bool set_value_on_csr_msg(struct adf_accel_dev *accel_dev, u32 *csr_msg,
     25				 u32 value, const struct pfvf_field_format *fmt)
     26{
     27	if (unlikely((value & fmt->mask) != value)) {
     28		dev_err(&GET_DEV(accel_dev),
     29			"PFVF message value 0x%X out of range, %u max allowed\n",
     30			value, fmt->mask);
     31		return false;
     32	}
     33
     34	*csr_msg |= value << fmt->offset;
     35
     36	return true;
     37}
     38
     39u32 adf_pfvf_csr_msg_of(struct adf_accel_dev *accel_dev,
     40			struct pfvf_message msg,
     41			const struct pfvf_csr_format *fmt)
     42{
     43	u32 csr_msg = 0;
     44
     45	if (!set_value_on_csr_msg(accel_dev, &csr_msg, msg.type, &fmt->type) ||
     46	    !set_value_on_csr_msg(accel_dev, &csr_msg, msg.data, &fmt->data))
     47		return 0;
     48
     49	return csr_msg | ADF_PFVF_MSGORIGIN_SYSTEM;
     50}
     51
     52struct pfvf_message adf_pfvf_message_of(struct adf_accel_dev *accel_dev, u32 csr_msg,
     53					const struct pfvf_csr_format *fmt)
     54{
     55	struct pfvf_message msg = { 0 };
     56
     57	msg.type = (csr_msg >> fmt->type.offset) & fmt->type.mask;
     58	msg.data = (csr_msg >> fmt->data.offset) & fmt->data.mask;
     59
     60	if (unlikely(!msg.type))
     61		dev_err(&GET_DEV(accel_dev),
     62			"Invalid PFVF msg with no type received\n");
     63
     64	return msg;
     65}