xref: /linux/arch/s390/pci/pci_debug.c (revision 3df692169e8486fc3dd91fcd5ea81c27a0bac033)
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 
21 static struct dentry *debugfs_root;
22 debug_info_t *pci_debug_msg_id;
23 EXPORT_SYMBOL_GPL(pci_debug_msg_id);
24 debug_info_t *pci_debug_err_id;
25 EXPORT_SYMBOL_GPL(pci_debug_err_id);
26 
27 static char *pci_common_names[] = {
28 	"Load operations",
29 	"Store operations",
30 	"Store block operations",
31 	"Refresh operations",
32 };
33 
34 static char *pci_fmt0_names[] = {
35 	"DMA read bytes",
36 	"DMA write bytes",
37 };
38 
39 static char *pci_fmt1_names[] = {
40 	"Received bytes",
41 	"Received packets",
42 	"Transmitted bytes",
43 	"Transmitted packets",
44 };
45 
46 static char *pci_fmt2_names[] = {
47 	"Consumed work units",
48 	"Maximum work units",
49 };
50 
51 static char *pci_fmt3_names[] = {
52 	"Transmitted bytes",
53 };
54 
55 static char *pci_sw_names[] = {
56 	"Mapped pages",
57 	"Unmapped pages",
58 	"Global RPCITs",
59 	"Sync Map RPCITs",
60 	"Sync RPCITs",
61 };
62 
63 static 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 
72 static 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 
87 static 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->lock);
95 	if (!zdev->fmb) {
96 		mutex_unlock(&zdev->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->lock);
134 	return 0;
135 }
136 
137 static 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->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->lock);
161 	return rc ? rc : count;
162 }
163 
164 static 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 
170 static 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 
178 void 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 
186 void zpci_debug_exit_device(struct zpci_dev *zdev)
187 {
188 	debugfs_remove_recursive(zdev->debugfs_dev);
189 }
190 
191 int __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 
211 void 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