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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nfp_mip.c (3489B)

      1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
      2/* Copyright (C) 2015-2017 Netronome Systems, Inc. */
      3
      4/*
      5 * nfp_mip.c
      6 * Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
      7 *          Jason McMullan <jason.mcmullan@netronome.com>
      8 *          Espen Skoglund <espen.skoglund@netronome.com>
      9 */
     10#include <linux/kernel.h>
     11#include <linux/slab.h>
     12
     13#include "nfp.h"
     14#include "nfp_cpp.h"
     15#include "nfp_nffw.h"
     16
     17#define NFP_MIP_SIGNATURE	cpu_to_le32(0x0050494d)  /* "MIP\0" */
     18#define NFP_MIP_VERSION		cpu_to_le32(1)
     19#define NFP_MIP_MAX_OFFSET	(256 * 1024)
     20
     21struct nfp_mip {
     22	__le32 signature;
     23	__le32 mip_version;
     24	__le32 mip_size;
     25	__le32 first_entry;
     26
     27	__le32 version;
     28	__le32 buildnum;
     29	__le32 buildtime;
     30	__le32 loadtime;
     31
     32	__le32 symtab_addr;
     33	__le32 symtab_size;
     34	__le32 strtab_addr;
     35	__le32 strtab_size;
     36
     37	char name[16];
     38	char toolchain[32];
     39};
     40
     41/* Read memory and check if it could be a valid MIP */
     42static int
     43nfp_mip_try_read(struct nfp_cpp *cpp, u32 cpp_id, u64 addr, struct nfp_mip *mip)
     44{
     45	int ret;
     46
     47	ret = nfp_cpp_read(cpp, cpp_id, addr, mip, sizeof(*mip));
     48	if (ret != sizeof(*mip)) {
     49		nfp_err(cpp, "Failed to read MIP data (%d, %zu)\n",
     50			ret, sizeof(*mip));
     51		return -EIO;
     52	}
     53	if (mip->signature != NFP_MIP_SIGNATURE) {
     54		nfp_warn(cpp, "Incorrect MIP signature (0x%08x)\n",
     55			 le32_to_cpu(mip->signature));
     56		return -EINVAL;
     57	}
     58	if (mip->mip_version != NFP_MIP_VERSION) {
     59		nfp_warn(cpp, "Unsupported MIP version (%d)\n",
     60			 le32_to_cpu(mip->mip_version));
     61		return -EINVAL;
     62	}
     63
     64	return 0;
     65}
     66
     67/* Try to locate MIP using the resource table */
     68static int nfp_mip_read_resource(struct nfp_cpp *cpp, struct nfp_mip *mip)
     69{
     70	struct nfp_nffw_info *nffw_info;
     71	u32 cpp_id;
     72	u64 addr;
     73	int err;
     74
     75	nffw_info = nfp_nffw_info_open(cpp);
     76	if (IS_ERR(nffw_info))
     77		return PTR_ERR(nffw_info);
     78
     79	err = nfp_nffw_info_mip_first(nffw_info, &cpp_id, &addr);
     80	if (err)
     81		goto exit_close_nffw;
     82
     83	err = nfp_mip_try_read(cpp, cpp_id, addr, mip);
     84exit_close_nffw:
     85	nfp_nffw_info_close(nffw_info);
     86	return err;
     87}
     88
     89/**
     90 * nfp_mip_open() - Get device MIP structure
     91 * @cpp:	NFP CPP Handle
     92 *
     93 * Copy MIP structure from NFP device and return it.  The returned
     94 * structure is handled internally by the library and should be
     95 * freed by calling nfp_mip_close().
     96 *
     97 * Return: pointer to mip, NULL on failure.
     98 */
     99const struct nfp_mip *nfp_mip_open(struct nfp_cpp *cpp)
    100{
    101	struct nfp_mip *mip;
    102	int err;
    103
    104	mip = kmalloc(sizeof(*mip), GFP_KERNEL);
    105	if (!mip)
    106		return NULL;
    107
    108	err = nfp_mip_read_resource(cpp, mip);
    109	if (err) {
    110		kfree(mip);
    111		return NULL;
    112	}
    113
    114	mip->name[sizeof(mip->name) - 1] = 0;
    115
    116	return mip;
    117}
    118
    119void nfp_mip_close(const struct nfp_mip *mip)
    120{
    121	kfree(mip);
    122}
    123
    124const char *nfp_mip_name(const struct nfp_mip *mip)
    125{
    126	return mip->name;
    127}
    128
    129/**
    130 * nfp_mip_symtab() - Get the address and size of the MIP symbol table
    131 * @mip:	MIP handle
    132 * @addr:	Location for NFP DDR address of MIP symbol table
    133 * @size:	Location for size of MIP symbol table
    134 */
    135void nfp_mip_symtab(const struct nfp_mip *mip, u32 *addr, u32 *size)
    136{
    137	*addr = le32_to_cpu(mip->symtab_addr);
    138	*size = le32_to_cpu(mip->symtab_size);
    139}
    140
    141/**
    142 * nfp_mip_strtab() - Get the address and size of the MIP symbol name table
    143 * @mip:	MIP handle
    144 * @addr:	Location for NFP DDR address of MIP symbol name table
    145 * @size:	Location for size of MIP symbol name table
    146 */
    147void nfp_mip_strtab(const struct nfp_mip *mip, u32 *addr, u32 *size)
    148{
    149	*addr = le32_to_cpu(mip->strtab_addr);
    150	*size = le32_to_cpu(mip->strtab_size);
    151}