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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cc_debugfs.c (2769B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (C) 2012-2019 ARM Limited or its affiliates. */
      3
      4#include <linux/kernel.h>
      5#include <linux/debugfs.h>
      6#include <linux/stringify.h>
      7#include "cc_driver.h"
      8#include "cc_crypto_ctx.h"
      9#include "cc_debugfs.h"
     10
     11#define CC_DEBUG_REG(_X) {	\
     12	.name = __stringify(_X),\
     13	.offset = CC_REG(_X)	\
     14	}
     15
     16/*
     17 * This is a global var for the dentry of the
     18 * debugfs ccree/ dir. It is not tied down to
     19 * a specific instance of ccree, hence it is
     20 * global.
     21 */
     22static struct dentry *cc_debugfs_dir;
     23
     24static struct debugfs_reg32 ver_sig_regs[] = {
     25	{ .name = "SIGNATURE" }, /* Must be 0th */
     26	{ .name = "VERSION" }, /* Must be 1st */
     27};
     28
     29static const struct debugfs_reg32 pid_cid_regs[] = {
     30	CC_DEBUG_REG(PERIPHERAL_ID_0),
     31	CC_DEBUG_REG(PERIPHERAL_ID_1),
     32	CC_DEBUG_REG(PERIPHERAL_ID_2),
     33	CC_DEBUG_REG(PERIPHERAL_ID_3),
     34	CC_DEBUG_REG(PERIPHERAL_ID_4),
     35	CC_DEBUG_REG(COMPONENT_ID_0),
     36	CC_DEBUG_REG(COMPONENT_ID_1),
     37	CC_DEBUG_REG(COMPONENT_ID_2),
     38	CC_DEBUG_REG(COMPONENT_ID_3),
     39};
     40
     41static const struct debugfs_reg32 debug_regs[] = {
     42	CC_DEBUG_REG(HOST_IRR),
     43	CC_DEBUG_REG(HOST_POWER_DOWN_EN),
     44	CC_DEBUG_REG(AXIM_MON_ERR),
     45	CC_DEBUG_REG(DSCRPTR_QUEUE_CONTENT),
     46	CC_DEBUG_REG(HOST_IMR),
     47	CC_DEBUG_REG(AXIM_CFG),
     48	CC_DEBUG_REG(AXIM_CACHE_PARAMS),
     49	CC_DEBUG_REG(GPR_HOST),
     50	CC_DEBUG_REG(AXIM_MON_COMP),
     51};
     52
     53void __init cc_debugfs_global_init(void)
     54{
     55	cc_debugfs_dir = debugfs_create_dir("ccree", NULL);
     56}
     57
     58void __exit cc_debugfs_global_fini(void)
     59{
     60	debugfs_remove(cc_debugfs_dir);
     61}
     62
     63int cc_debugfs_init(struct cc_drvdata *drvdata)
     64{
     65	struct device *dev = drvdata_to_dev(drvdata);
     66	struct debugfs_regset32 *regset, *verset;
     67
     68	regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
     69	if (!regset)
     70		return -ENOMEM;
     71
     72	regset->regs = debug_regs;
     73	regset->nregs = ARRAY_SIZE(debug_regs);
     74	regset->base = drvdata->cc_base;
     75	regset->dev = dev;
     76
     77	drvdata->dir = debugfs_create_dir(drvdata->plat_dev->name,
     78					  cc_debugfs_dir);
     79
     80	debugfs_create_regset32("regs", 0400, drvdata->dir, regset);
     81	debugfs_create_bool("coherent", 0400, drvdata->dir, &drvdata->coherent);
     82
     83	verset = devm_kzalloc(dev, sizeof(*verset), GFP_KERNEL);
     84	/* Failing here is not important enough to fail the module load */
     85	if (!verset)
     86		return 0;
     87
     88	if (drvdata->hw_rev <= CC_HW_REV_712) {
     89		ver_sig_regs[0].offset = drvdata->sig_offset;
     90		ver_sig_regs[1].offset = drvdata->ver_offset;
     91		verset->regs = ver_sig_regs;
     92		verset->nregs = ARRAY_SIZE(ver_sig_regs);
     93	} else {
     94		verset->regs = pid_cid_regs;
     95		verset->nregs = ARRAY_SIZE(pid_cid_regs);
     96	}
     97	verset->base = drvdata->cc_base;
     98	verset->dev = dev;
     99
    100	debugfs_create_regset32("version", 0400, drvdata->dir, verset);
    101	return 0;
    102}
    103
    104void cc_debugfs_fini(struct cc_drvdata *drvdata)
    105{
    106	debugfs_remove_recursive(drvdata->dir);
    107}