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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armada_debugfs.c (2630B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2012 Russell King
      4 *  Rewritten from the dovefb driver, and Armada510 manuals.
      5 */
      6
      7#include <linux/ctype.h>
      8#include <linux/module.h>
      9#include <linux/seq_file.h>
     10#include <linux/uaccess.h>
     11
     12#include <drm/drm_debugfs.h>
     13#include <drm/drm_file.h>
     14
     15#include "armada_crtc.h"
     16#include "armada_drm.h"
     17
     18static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
     19{
     20	struct drm_info_node *node = m->private;
     21	struct drm_device *dev = node->minor->dev;
     22	struct armada_private *priv = drm_to_armada_dev(dev);
     23	struct drm_printer p = drm_seq_file_printer(m);
     24
     25	mutex_lock(&priv->linear_lock);
     26	drm_mm_print(&priv->linear, &p);
     27	mutex_unlock(&priv->linear_lock);
     28
     29	return 0;
     30}
     31
     32static int armada_debugfs_crtc_reg_show(struct seq_file *m, void *data)
     33{
     34	struct armada_crtc *dcrtc = m->private;
     35	int i;
     36
     37	for (i = 0x84; i <= 0x1c4; i += 4) {
     38		u32 v = readl_relaxed(dcrtc->base + i);
     39		seq_printf(m, "0x%04x: 0x%08x\n", i, v);
     40	}
     41
     42	return 0;
     43}
     44
     45static int armada_debugfs_crtc_reg_open(struct inode *inode, struct file *file)
     46{
     47	return single_open(file, armada_debugfs_crtc_reg_show,
     48			   inode->i_private);
     49}
     50
     51static int armada_debugfs_crtc_reg_write(struct file *file,
     52	const char __user *ptr, size_t len, loff_t *off)
     53{
     54	struct armada_crtc *dcrtc;
     55	unsigned long reg, mask, val;
     56	char buf[32];
     57	int ret;
     58	u32 v;
     59
     60	if (*off != 0)
     61		return 0;
     62
     63	if (len > sizeof(buf) - 1)
     64		len = sizeof(buf) - 1;
     65
     66	ret = strncpy_from_user(buf, ptr, len);
     67	if (ret < 0)
     68		return ret;
     69	buf[len] = '\0';
     70
     71	if (sscanf(buf, "%lx %lx %lx", &reg, &mask, &val) != 3)
     72		return -EINVAL;
     73	if (reg < 0x84 || reg > 0x1c4 || reg & 3)
     74		return -ERANGE;
     75
     76	dcrtc = ((struct seq_file *)file->private_data)->private;
     77	v = readl(dcrtc->base + reg);
     78	v &= ~mask;
     79	v |= val & mask;
     80	writel(v, dcrtc->base + reg);
     81
     82	return len;
     83}
     84
     85static const struct file_operations armada_debugfs_crtc_reg_fops = {
     86	.owner = THIS_MODULE,
     87	.open = armada_debugfs_crtc_reg_open,
     88	.read = seq_read,
     89	.write = armada_debugfs_crtc_reg_write,
     90	.llseek = seq_lseek,
     91	.release = single_release,
     92};
     93
     94void armada_drm_crtc_debugfs_init(struct armada_crtc *dcrtc)
     95{
     96	debugfs_create_file("armada-regs", 0600, dcrtc->crtc.debugfs_entry,
     97			    dcrtc, &armada_debugfs_crtc_reg_fops);
     98}
     99
    100static struct drm_info_list armada_debugfs_list[] = {
    101	{ "gem_linear", armada_debugfs_gem_linear_show, 0 },
    102};
    103#define ARMADA_DEBUGFS_ENTRIES ARRAY_SIZE(armada_debugfs_list)
    104
    105int armada_drm_debugfs_init(struct drm_minor *minor)
    106{
    107	drm_debugfs_create_files(armada_debugfs_list, ARMADA_DEBUGFS_ENTRIES,
    108				 minor->debugfs_root, minor);
    109
    110	return 0;
    111}