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	"Mapped pages",
57	"Unmapped pages",
58	"Global RPCITs",
59	"Sync Map RPCITs",
60	"Sync RPCITs",
61};
62
63static void pci_fmb_show(struct seq_file *m, char *name[], int length,
64			 u64 *data)
65{
66	int i;
67
68	for (i = 0; i < length; i++, data++)
69		seq_printf(m, "%26s:\t%llu\n", name[i], *data);
70}
71
72static void pci_sw_counter_show(struct seq_file *m)
73{
74	struct zpci_iommu_ctrs  *ctrs = zpci_get_iommu_ctrs(m->private);
75	atomic64_t *counter;
76	int i;
77
78	if (!ctrs)
79		return;
80
81	counter = &ctrs->mapped_pages;
82	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
83		seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
84			   atomic64_read(counter));
85}
86
87static int pci_perf_show(struct seq_file *m, void *v)
88{
89	struct zpci_dev *zdev = m->private;
90
91	if (!zdev)
92		return 0;
93
94	mutex_lock(&zdev->fmb_lock);
95	if (!zdev->fmb) {
96		mutex_unlock(&zdev->fmb_lock);
97		seq_puts(m, "FMB statistics disabled\n");
98		return 0;
99	}
100
101	/* header */
102	seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
103	seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
104	seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
105
106	pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
107		     &zdev->fmb->ld_ops);
108
109	switch (zdev->fmb->format) {
110	case 0:
111		if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
112			break;
113		pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
114			     &zdev->fmb->fmt0.dma_rbytes);
115		break;
116	case 1:
117		pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
118			     &zdev->fmb->fmt1.rx_bytes);
119		break;
120	case 2:
121		pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
122			     &zdev->fmb->fmt2.consumed_work_units);
123		break;
124	case 3:
125		pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
126			     &zdev->fmb->fmt3.tx_bytes);
127		break;
128	default:
129		seq_puts(m, "Unknown format\n");
130	}
131
132	pci_sw_counter_show(m);
133	mutex_unlock(&zdev->fmb_lock);
134	return 0;
135}
136
137static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
138				  size_t count, loff_t *off)
139{
140	struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
141	unsigned long val;
142	int rc;
143
144	if (!zdev)
145		return 0;
146
147	rc = kstrtoul_from_user(ubuf, count, 10, &val);
148	if (rc)
149		return rc;
150
151	mutex_lock(&zdev->fmb_lock);
152	switch (val) {
153	case 0:
154		rc = zpci_fmb_disable_device(zdev);
155		break;
156	case 1:
157		rc = zpci_fmb_enable_device(zdev);
158		break;
159	}
160	mutex_unlock(&zdev->fmb_lock);
161	return rc ? rc : count;
162}
163
164static int pci_perf_seq_open(struct inode *inode, struct file *filp)
165{
166	return single_open(filp, pci_perf_show,
167			   file_inode(filp)->i_private);
168}
169
170static const struct file_operations debugfs_pci_perf_fops = {
171	.open	 = pci_perf_seq_open,
172	.read	 = seq_read,
173	.write	 = pci_perf_seq_write,
174	.llseek  = seq_lseek,
175	.release = single_release,
176};
177
178void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
179{
180	zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
181
182	debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
183			    zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
184}
185
186void zpci_debug_exit_device(struct zpci_dev *zdev)
187{
188	debugfs_remove_recursive(zdev->debugfs_dev);
189}
190
191int __init zpci_debug_init(void)
192{
193	/* event trace buffer */
194	pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
195	if (!pci_debug_msg_id)
196		return -EINVAL;
197	debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
198	debug_set_level(pci_debug_msg_id, 3);
199
200	/* error log */
201	pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
202	if (!pci_debug_err_id)
203		return -EINVAL;
204	debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
205	debug_set_level(pci_debug_err_id, 3);
206
207	debugfs_root = debugfs_create_dir("pci", NULL);
208	return 0;
209}
210
211void zpci_debug_exit(void)
212{
213	debug_unregister(pci_debug_msg_id);
214	debug_unregister(pci_debug_err_id);
215	debugfs_remove(debugfs_root);
216}
217