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 "Allocated pages",
57 "Mapped pages",
58 "Unmapped pages",
59 };
60
pci_fmb_show(struct seq_file * m,char * name[],int length,u64 * data)61 static 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
pci_sw_counter_show(struct seq_file * m)70 static 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%lu\n", pci_sw_names[i],
78 atomic64_read(counter));
79 }
80
pci_perf_show(struct seq_file * m,void * v)81 static 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
pci_perf_seq_write(struct file * file,const char __user * ubuf,size_t count,loff_t * off)131 static 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
pci_perf_seq_open(struct inode * inode,struct file * filp)158 static 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
164 static 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
zpci_debug_init_device(struct zpci_dev * zdev,const char * name)172 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
173 {
174 zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
175 if (IS_ERR(zdev->debugfs_dev))
176 zdev->debugfs_dev = NULL;
177
178 zdev->debugfs_perf = debugfs_create_file("statistics",
179 S_IFREG | S_IRUGO | S_IWUSR,
180 zdev->debugfs_dev, zdev,
181 &debugfs_pci_perf_fops);
182 if (IS_ERR(zdev->debugfs_perf))
183 zdev->debugfs_perf = NULL;
184 }
185
zpci_debug_exit_device(struct zpci_dev * zdev)186 void zpci_debug_exit_device(struct zpci_dev *zdev)
187 {
188 debugfs_remove(zdev->debugfs_perf);
189 debugfs_remove(zdev->debugfs_dev);
190 }
191
zpci_debug_init(void)192 int __init zpci_debug_init(void)
193 {
194 /* event trace buffer */
195 pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
196 if (!pci_debug_msg_id)
197 return -EINVAL;
198 debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
199 debug_set_level(pci_debug_msg_id, 3);
200
201 /* error log */
202 pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
203 if (!pci_debug_err_id)
204 return -EINVAL;
205 debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
206 debug_set_level(pci_debug_err_id, 6);
207
208 debugfs_root = debugfs_create_dir("pci", NULL);
209 return 0;
210 }
211
zpci_debug_exit(void)212 void zpci_debug_exit(void)
213 {
214 debug_unregister(pci_debug_msg_id);
215 debug_unregister(pci_debug_err_id);
216 debugfs_remove(debugfs_root);
217 }
218
