1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
3#include <linux/init.h>
4#include <linux/kernel.h>
5#include <linux/module.h>
6#include <linux/pci.h>
7#include <linux/debugfs.h>
8#include <linux/io-64-nonatomic-lo-hi.h>
9#include <uapi/linux/idxd.h>
10#include "idxd.h"
11#include "registers.h"
12
13static struct dentry *idxd_debugfs_dir;
14
15static void dump_event_entry(struct idxd_device *idxd, struct seq_file *s,
16			     u16 index, int *count, bool processed)
17{
18	struct idxd_evl *evl = idxd->evl;
19	struct dsa_evl_entry *entry;
20	struct dsa_completion_record *cr;
21	u64 *raw;
22	int i;
23	int evl_strides = evl_ent_size(idxd) / sizeof(u64);
24
25	entry = (struct dsa_evl_entry *)evl->log + index;
26
27	if (!entry->e.desc_valid)
28		return;
29
30	seq_printf(s, "Event Log entry %d (real index %u) processed: %u\n",
31		   *count, index, processed);
32
33	seq_printf(s, "desc valid %u wq idx valid %u\n"
34		   "batch %u fault rw %u priv %u error 0x%x\n"
35		   "wq idx %u op %#x pasid %u batch idx %u\n"
36		   "fault addr %#llx\n",
37		   entry->e.desc_valid, entry->e.wq_idx_valid,
38		   entry->e.batch, entry->e.fault_rw, entry->e.priv,
39		   entry->e.error, entry->e.wq_idx, entry->e.operation,
40		   entry->e.pasid, entry->e.batch_idx, entry->e.fault_addr);
41
42	cr = &entry->cr;
43	seq_printf(s, "status %#x result %#x fault_info %#x bytes_completed %u\n"
44		   "fault addr %#llx inv flags %#x\n\n",
45		   cr->status, cr->result, cr->fault_info, cr->bytes_completed,
46		   cr->fault_addr, cr->invalid_flags);
47
48	raw = (u64 *)entry;
49
50	for (i = 0; i < evl_strides; i++)
51		seq_printf(s, "entry[%d] = %#llx\n", i, raw[i]);
52
53	seq_puts(s, "\n");
54	*count += 1;
55}
56
57static int debugfs_evl_show(struct seq_file *s, void *d)
58{
59	struct idxd_device *idxd = s->private;
60	struct idxd_evl *evl = idxd->evl;
61	union evl_status_reg evl_status;
62	u16 h, t, evl_size, i;
63	int count = 0;
64	bool processed = true;
65
66	if (!evl || !evl->log)
67		return 0;
68
69	mutex_lock(&evl->lock);
70
71	evl_status.bits = ioread64(idxd->reg_base + IDXD_EVLSTATUS_OFFSET);
72	t = evl_status.tail;
73	h = evl_status.head;
74	evl_size = evl->size;
75
76	seq_printf(s, "Event Log head %u tail %u interrupt pending %u\n\n",
77		   evl_status.head, evl_status.tail, evl_status.int_pending);
78
79	i = t;
80	while (1) {
81		i = (i + 1) % evl_size;
82		if (i == t)
83			break;
84
85		if (processed && i == h)
86			processed = false;
87		dump_event_entry(idxd, s, i, &count, processed);
88	}
89
90	mutex_unlock(&evl->lock);
91	return 0;
92}
93
94DEFINE_SHOW_ATTRIBUTE(debugfs_evl);
95
96int idxd_device_init_debugfs(struct idxd_device *idxd)
97{
98	if (IS_ERR_OR_NULL(idxd_debugfs_dir))
99		return 0;
100
101	idxd->dbgfs_dir = debugfs_create_dir(dev_name(idxd_confdev(idxd)), idxd_debugfs_dir);
102	if (IS_ERR(idxd->dbgfs_dir))
103		return PTR_ERR(idxd->dbgfs_dir);
104
105	if (idxd->evl) {
106		idxd->dbgfs_evl_file = debugfs_create_file("event_log", 0400,
107							   idxd->dbgfs_dir, idxd,
108							   &debugfs_evl_fops);
109		if (IS_ERR(idxd->dbgfs_evl_file)) {
110			debugfs_remove_recursive(idxd->dbgfs_dir);
111			idxd->dbgfs_dir = NULL;
112			return PTR_ERR(idxd->dbgfs_evl_file);
113		}
114	}
115
116	return 0;
117}
118
119void idxd_device_remove_debugfs(struct idxd_device *idxd)
120{
121	debugfs_remove_recursive(idxd->dbgfs_dir);
122}
123
124int idxd_init_debugfs(void)
125{
126	if (!debugfs_initialized())
127		return 0;
128
129	idxd_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
130	if (IS_ERR(idxd_debugfs_dir))
131		return  PTR_ERR(idxd_debugfs_dir);
132	return 0;
133}
134
135void idxd_remove_debugfs(void)
136{
137	debugfs_remove_recursive(idxd_debugfs_dir);
138}
139