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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cvmx-helper-npi.c (3131B)

      1/***********************license start***************
      2 * Author: Cavium Networks
      3 *
      4 * Contact: support@caviumnetworks.com
      5 * This file is part of the OCTEON SDK
      6 *
      7 * Copyright (c) 2003-2008 Cavium Networks
      8 *
      9 * This file is free software; you can redistribute it and/or modify
     10 * it under the terms of the GNU General Public License, Version 2, as
     11 * published by the Free Software Foundation.
     12 *
     13 * This file is distributed in the hope that it will be useful, but
     14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
     15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
     16 * NONINFRINGEMENT.  See the GNU General Public License for more
     17 * details.
     18 *
     19 * You should have received a copy of the GNU General Public License
     20 * along with this file; if not, write to the Free Software
     21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
     22 * or visit http://www.gnu.org/licenses/.
     23 *
     24 * This file may also be available under a different license from Cavium.
     25 * Contact Cavium Networks for more information
     26 ***********************license end**************************************/
     27
     28/*
     29 * Functions for NPI initialization, configuration,
     30 * and monitoring.
     31 */
     32#include <asm/octeon/octeon.h>
     33
     34#include <asm/octeon/cvmx-config.h>
     35
     36#include <asm/octeon/cvmx-helper.h>
     37
     38#include <asm/octeon/cvmx-pip-defs.h>
     39
     40/**
     41 * Probe a NPI interface and determine the number of ports
     42 * connected to it. The NPI interface should still be down
     43 * after this call.
     44 *
     45 * @interface: Interface to probe
     46 *
     47 * Returns Number of ports on the interface. Zero to disable.
     48 */
     49int __cvmx_helper_npi_probe(int interface)
     50{
     51#if CVMX_PKO_QUEUES_PER_PORT_PCI > 0
     52	if (OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX))
     53		return 4;
     54	else if (OCTEON_IS_MODEL(OCTEON_CN56XX)
     55		 && !OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X))
     56		/* The packet engines didn't exist before pass 2 */
     57		return 4;
     58	else if (OCTEON_IS_MODEL(OCTEON_CN52XX)
     59		 && !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X))
     60		/* The packet engines didn't exist before pass 2 */
     61		return 4;
     62#endif
     63	return 0;
     64}
     65
     66/**
     67 * Bringup and enable a NPI interface. After this call packet
     68 * I/O should be fully functional. This is called with IPD
     69 * enabled but PKO disabled.
     70 *
     71 * @interface: Interface to bring up
     72 *
     73 * Returns Zero on success, negative on failure
     74 */
     75int __cvmx_helper_npi_enable(int interface)
     76{
     77	/*
     78	 * On CN50XX, CN52XX, and CN56XX we need to disable length
     79	 * checking so packet < 64 bytes and jumbo frames don't get
     80	 * errors.
     81	 */
     82	if (!OCTEON_IS_MODEL(OCTEON_CN3XXX) &&
     83	    !OCTEON_IS_MODEL(OCTEON_CN58XX)) {
     84		int num_ports = cvmx_helper_ports_on_interface(interface);
     85		int port;
     86		for (port = 0; port < num_ports; port++) {
     87			union cvmx_pip_prt_cfgx port_cfg;
     88			int ipd_port =
     89			    cvmx_helper_get_ipd_port(interface, port);
     90			port_cfg.u64 =
     91			    cvmx_read_csr(CVMX_PIP_PRT_CFGX(ipd_port));
     92			port_cfg.s.maxerr_en = 0;
     93			port_cfg.s.minerr_en = 0;
     94			cvmx_write_csr(CVMX_PIP_PRT_CFGX(ipd_port),
     95				       port_cfg.u64);
     96		}
     97	}
     98
     99	/* Enables are controlled by the remote host, so nothing to do here */
    100	return 0;
    101}