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, fmt: "%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, fmt: "%26s:\t%llu\n", pci_sw_names[i],
84 atomic64_read(v: 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(lock: &zdev->fmb_lock);
97 seq_puts(m, s: "FMB statistics disabled\n");
98 return 0;
99 }
100
101 /* header */
102 seq_printf(m, fmt: "Update interval: %u ms\n", zdev->fmb_update);
103 seq_printf(m, fmt: "Samples: %u\n", zdev->fmb->samples);
104 seq_printf(m, fmt: "Last update TOD: %Lx\n", zdev->fmb->last_update);
105
106 pci_fmb_show(m, name: pci_common_names, ARRAY_SIZE(pci_common_names),
107 data: &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, name: pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
114 data: &zdev->fmb->fmt0.dma_rbytes);
115 break;
116 case 1:
117 pci_fmb_show(m, name: pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
118 data: &zdev->fmb->fmt1.rx_bytes);
119 break;
120 case 2:
121 pci_fmb_show(m, name: pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
122 data: &zdev->fmb->fmt2.consumed_work_units);
123 break;
124 case 3:
125 pci_fmb_show(m, name: pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
126 data: &zdev->fmb->fmt3.tx_bytes);
127 break;
128 default:
129 seq_puts(m, s: "Unknown format\n");
130 }
131
132 pci_sw_counter_show(m);
133 mutex_unlock(lock: &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(s: ubuf, count, base: 10, res: &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(lock: &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(f: 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, parent: debugfs_root);
181
182 debugfs_create_file(name: "statistics", S_IFREG | S_IRUGO | S_IWUSR,
183 parent: zdev->debugfs_dev, data: zdev, fops: &debugfs_pci_perf_fops);
184}
185
186void zpci_debug_exit_device(struct zpci_dev *zdev)
187{
188 debugfs_remove_recursive(dentry: 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(name: "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(dentry: debugfs_root);
216}
217

source code of linux/arch/s390/pci/pci_debug.c