1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  Copyright IBM Corp. 2012,2015
4 *
5 *  Author(s):
6 *    Jan Glauber <jang@linux.vnet.ibm.com>
7 */
8
9#define KMSG_COMPONENT "zpci"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/seq_file.h>
14#include <linux/debugfs.h>
15#include <linux/export.h>
16#include <linux/pci.h>
17#include <asm/debug.h>
18
19#include <asm/pci_dma.h>
20
21static struct dentry *debugfs_root;
22debug_info_t *pci_debug_msg_id;
23EXPORT_SYMBOL_GPL(pci_debug_msg_id);
24debug_info_t *pci_debug_err_id;
25EXPORT_SYMBOL_GPL(pci_debug_err_id);
26
27static char *pci_common_names[] = {
28	"Load operations",
29	"Store operations",
30	"Store block operations",
31	"Refresh operations",
32};
33
34static char *pci_fmt0_names[] = {
35	"DMA read bytes",
36	"DMA write bytes",
37};
38
39static char *pci_fmt1_names[] = {
40	"Received bytes",
41	"Received packets",
42	"Transmitted bytes",
43	"Transmitted packets",
44};
45
46static char *pci_fmt2_names[] = {
47	"Consumed work units",
48	"Maximum work units",
49};
50
51static char *pci_fmt3_names[] = {
52	"Transmitted bytes",
53};
54
55static char *pci_sw_names[] = {
56	"Allocated pages",
57	"Mapped pages",
58	"Unmapped pages",
59};
60
61static void pci_fmb_show(struct seq_file *m, char *name[], int length,
62			 u64 *data)
63{
64	int i;
65
66	for (i = 0; i < length; i++, data++)
67		seq_printf(m, "%26s:\t%llu\n", name[i], *data);
68}
69
70static void pci_sw_counter_show(struct seq_file *m)
71{
72	struct zpci_dev *zdev = m->private;
73	atomic64_t *counter = &zdev->allocated_pages;
74	int i;
75
76	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
77		seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
78			   atomic64_read(counter));
79}
80
81static int pci_perf_show(struct seq_file *m, void *v)
82{
83	struct zpci_dev *zdev = m->private;
84
85	if (!zdev)
86		return 0;
87
88	mutex_lock(&zdev->lock);
89	if (!zdev->fmb) {
90		mutex_unlock(&zdev->lock);
91		seq_puts(m, "FMB statistics disabled\n");
92		return 0;
93	}
94
95	/* header */
96	seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
97	seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
98	seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
99
100	pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
101		     &zdev->fmb->ld_ops);
102
103	switch (zdev->fmb->format) {
104	case 0:
105		if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
106			break;
107		pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
108			     &zdev->fmb->fmt0.dma_rbytes);
109		break;
110	case 1:
111		pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
112			     &zdev->fmb->fmt1.rx_bytes);
113		break;
114	case 2:
115		pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
116			     &zdev->fmb->fmt2.consumed_work_units);
117		break;
118	case 3:
119		pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
120			     &zdev->fmb->fmt3.tx_bytes);
121		break;
122	default:
123		seq_puts(m, "Unknown format\n");
124	}
125
126	pci_sw_counter_show(m);
127	mutex_unlock(&zdev->lock);
128	return 0;
129}
130
131static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
132				  size_t count, loff_t *off)
133{
134	struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
135	unsigned long val;
136	int rc;
137
138	if (!zdev)
139		return 0;
140
141	rc = kstrtoul_from_user(ubuf, count, 10, &val);
142	if (rc)
143		return rc;
144
145	mutex_lock(&zdev->lock);
146	switch (val) {
147	case 0:
148		rc = zpci_fmb_disable_device(zdev);
149		break;
150	case 1:
151		rc = zpci_fmb_enable_device(zdev);
152		break;
153	}
154	mutex_unlock(&zdev->lock);
155	return rc ? rc : count;
156}
157
158static int pci_perf_seq_open(struct inode *inode, struct file *filp)
159{
160	return single_open(filp, pci_perf_show,
161			   file_inode(filp)->i_private);
162}
163
164static const struct file_operations debugfs_pci_perf_fops = {
165	.open	 = pci_perf_seq_open,
166	.read	 = seq_read,
167	.write	 = pci_perf_seq_write,
168	.llseek  = seq_lseek,
169	.release = single_release,
170};
171
172void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
173{
174	zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
175
176	debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
177			    zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
178}
179
180void zpci_debug_exit_device(struct zpci_dev *zdev)
181{
182	debugfs_remove_recursive(zdev->debugfs_dev);
183}
184
185int __init zpci_debug_init(void)
186{
187	/* event trace buffer */
188	pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
189	if (!pci_debug_msg_id)
190		return -EINVAL;
191	debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
192	debug_set_level(pci_debug_msg_id, 3);
193
194	/* error log */
195	pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
196	if (!pci_debug_err_id)
197		return -EINVAL;
198	debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
199	debug_set_level(pci_debug_err_id, 6);
200
201	debugfs_root = debugfs_create_dir("pci", NULL);
202	return 0;
203}
204
205void zpci_debug_exit(void)
206{
207	debug_unregister(pci_debug_msg_id);
208	debug_unregister(pci_debug_err_id);
209	debugfs_remove(debugfs_root);
210}
211