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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dpmcp.c (2684B)

      1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
      2/*
      3 * Copyright 2013-2016 Freescale Semiconductor Inc.
      4 *
      5 */
      6#include <linux/kernel.h>
      7#include <linux/fsl/mc.h>
      8
      9#include "fsl-mc-private.h"
     10
     11/**
     12 * dpmcp_open() - Open a control session for the specified object.
     13 * @mc_io:	Pointer to MC portal's I/O object
     14 * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
     15 * @dpmcp_id:	DPMCP unique ID
     16 * @token:	Returned token; use in subsequent API calls
     17 *
     18 * This function can be used to open a control session for an
     19 * already created object; an object may have been declared in
     20 * the DPL or by calling the dpmcp_create function.
     21 * This function returns a unique authentication token,
     22 * associated with the specific object ID and the specific MC
     23 * portal; this token must be used in all subsequent commands for
     24 * this specific object
     25 *
     26 * Return:	'0' on Success; Error code otherwise.
     27 */
     28int dpmcp_open(struct fsl_mc_io *mc_io,
     29	       u32 cmd_flags,
     30	       int dpmcp_id,
     31	       u16 *token)
     32{
     33	struct fsl_mc_command cmd = { 0 };
     34	struct dpmcp_cmd_open *cmd_params;
     35	int err;
     36
     37	/* prepare command */
     38	cmd.header = mc_encode_cmd_header(DPMCP_CMDID_OPEN,
     39					  cmd_flags, 0);
     40	cmd_params = (struct dpmcp_cmd_open *)cmd.params;
     41	cmd_params->dpmcp_id = cpu_to_le32(dpmcp_id);
     42
     43	/* send command to mc*/
     44	err = mc_send_command(mc_io, &cmd);
     45	if (err)
     46		return err;
     47
     48	/* retrieve response parameters */
     49	*token = mc_cmd_hdr_read_token(&cmd);
     50
     51	return err;
     52}
     53
     54/**
     55 * dpmcp_close() - Close the control session of the object
     56 * @mc_io:	Pointer to MC portal's I/O object
     57 * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
     58 * @token:	Token of DPMCP object
     59 *
     60 * After this function is called, no further operations are
     61 * allowed on the object without opening a new control session.
     62 *
     63 * Return:	'0' on Success; Error code otherwise.
     64 */
     65int dpmcp_close(struct fsl_mc_io *mc_io,
     66		u32 cmd_flags,
     67		u16 token)
     68{
     69	struct fsl_mc_command cmd = { 0 };
     70
     71	/* prepare command */
     72	cmd.header = mc_encode_cmd_header(DPMCP_CMDID_CLOSE,
     73					  cmd_flags, token);
     74
     75	/* send command to mc*/
     76	return mc_send_command(mc_io, &cmd);
     77}
     78
     79/**
     80 * dpmcp_reset() - Reset the DPMCP, returns the object to initial state.
     81 * @mc_io:	Pointer to MC portal's I/O object
     82 * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
     83 * @token:	Token of DPMCP object
     84 *
     85 * Return:	'0' on Success; Error code otherwise.
     86 */
     87int dpmcp_reset(struct fsl_mc_io *mc_io,
     88		u32 cmd_flags,
     89		u16 token)
     90{
     91	struct fsl_mc_command cmd = { 0 };
     92
     93	/* prepare command */
     94	cmd.header = mc_encode_cmd_header(DPMCP_CMDID_RESET,
     95					  cmd_flags, token);
     96
     97	/* send command to mc*/
     98	return mc_send_command(mc_io, &cmd);
     99}