1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Intel MIC Platform Software Stack (MPSS)
  4 *
  5 * Copyright(c) 2015 Intel Corporation.
  6 *
  7 * Intel MIC Coprocessor State Management (COSM) Driver
  8 */
  9
 10#include <linux/debugfs.h>
 11#include <linux/slab.h>
 12#include <linux/io.h>
 13#include "cosm_main.h"
 14
 15/* Debugfs parent dir */
 16static struct dentry *cosm_dbg;
 17
 18/**
 19 * log_buf_show - Display MIC kernel log buffer
 20 *
 21 * log_buf addr/len is read from System.map by user space
 22 * and populated in sysfs entries.
 23 */
 24static int log_buf_show(struct seq_file *s, void *unused)
 25{
 26	void __iomem *log_buf_va;
 27	int __iomem *log_buf_len_va;
 28	struct cosm_device *cdev = s->private;
 29	void *kva;
 30	int size;
 31	u64 aper_offset;
 32
 33	if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
 34		goto done;
 35
 36	mutex_lock(&cdev->cosm_mutex);
 37	switch (cdev->state) {
 38	case MIC_BOOTING:
 39	case MIC_ONLINE:
 40	case MIC_SHUTTING_DOWN:
 41		break;
 42	default:
 43		goto unlock;
 44	}
 45
 46	/*
 47	 * Card kernel will never be relocated and any kernel text/data mapping
 48	 * can be translated to phys address by subtracting __START_KERNEL_map.
 49	 */
 50	aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map;
 51	log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
 52	aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map;
 53	log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
 54
 55	size = ioread32(log_buf_len_va);
 56	kva = kmalloc(size, GFP_KERNEL);
 57	if (!kva)
 58		goto unlock;
 59
 60	memcpy_fromio(kva, log_buf_va, size);
 61	seq_write(s, kva, size);
 62	kfree(kva);
 63unlock:
 64	mutex_unlock(&cdev->cosm_mutex);
 65done:
 66	return 0;
 67}
 68
 69DEFINE_SHOW_ATTRIBUTE(log_buf);
 70
 71/**
 72 * force_reset_show - Force MIC reset
 73 *
 74 * Invokes the force_reset COSM bus op instead of the standard reset
 75 * op in case a force reset of the MIC device is required
 76 */
 77static int force_reset_show(struct seq_file *s, void *pos)
 78{
 79	struct cosm_device *cdev = s->private;
 80
 81	cosm_stop(cdev, true);
 82	return 0;
 83}
 84
 85DEFINE_SHOW_ATTRIBUTE(force_reset);
 86
 87void cosm_create_debug_dir(struct cosm_device *cdev)
 88{
 89	char name[16];
 90
 91	if (!cosm_dbg)
 92		return;
 93
 94	scnprintf(name, sizeof(name), "mic%d", cdev->index);
 95	cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
 96
 97	debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev,
 98			    &log_buf_fops);
 99	debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
100			    &force_reset_fops);
101}
102
103void cosm_delete_debug_dir(struct cosm_device *cdev)
104{
105	if (!cdev->dbg_dir)
106		return;
107
108	debugfs_remove_recursive(cdev->dbg_dir);
109}
110
111void cosm_init_debugfs(void)
112{
113	cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
114}
115
116void cosm_exit_debugfs(void)
117{
118	debugfs_remove(cosm_dbg);
119}