1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2012,2015
4 *
5 * Author(s):
6 * Jan Glauber <[email protected]>
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
pci_fmb_show(struct seq_file * m,char * name[],int length,u64 * data)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
pci_sw_counter_show(struct seq_file * m)72 static void pci_sw_counter_show(struct seq_file *m)
73 {
74 struct zpci_dev *zdev = m->private;
75 struct zpci_iommu_ctrs *ctrs;
76 atomic64_t *counter;
77 unsigned long flags;
78 int i;
79
80 spin_lock_irqsave(&zdev->dom_lock, flags);
81 ctrs = zpci_get_iommu_ctrs(m->private);
82 if (!ctrs)
83 goto unlock;
84
85 counter = &ctrs->mapped_pages;
86 for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
87 seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
88 atomic64_read(counter));
89 unlock:
90 spin_unlock_irqrestore(&zdev->dom_lock, flags);
91 }
92
pci_perf_show(struct seq_file * m,void * v)93 static int pci_perf_show(struct seq_file *m, void *v)
94 {
95 struct zpci_dev *zdev = m->private;
96
97 if (!zdev)
98 return 0;
99
100 mutex_lock(&zdev->fmb_lock);
101 if (!zdev->fmb) {
102 mutex_unlock(&zdev->fmb_lock);
103 seq_puts(m, "FMB statistics disabled\n");
104 return 0;
105 }
106
107 /* header */
108 seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
109 seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
110 seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
111
112 pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
113 &zdev->fmb->ld_ops);
114
115 switch (zdev->fmb->format) {
116 case 0:
117 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
118 break;
119 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
120 &zdev->fmb->fmt0.dma_rbytes);
121 break;
122 case 1:
123 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
124 &zdev->fmb->fmt1.rx_bytes);
125 break;
126 case 2:
127 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
128 &zdev->fmb->fmt2.consumed_work_units);
129 break;
130 case 3:
131 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
132 &zdev->fmb->fmt3.tx_bytes);
133 break;
134 default:
135 seq_puts(m, "Unknown format\n");
136 }
137
138 pci_sw_counter_show(m);
139 mutex_unlock(&zdev->fmb_lock);
140 return 0;
141 }
142
pci_perf_seq_write(struct file * file,const char __user * ubuf,size_t count,loff_t * off)143 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
144 size_t count, loff_t *off)
145 {
146 struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
147 unsigned long val;
148 int rc;
149
150 if (!zdev)
151 return 0;
152
153 rc = kstrtoul_from_user(ubuf, count, 10, &val);
154 if (rc)
155 return rc;
156
157 mutex_lock(&zdev->fmb_lock);
158 switch (val) {
159 case 0:
160 rc = zpci_fmb_disable_device(zdev);
161 break;
162 case 1:
163 rc = zpci_fmb_enable_device(zdev);
164 break;
165 }
166 mutex_unlock(&zdev->fmb_lock);
167 return rc ? rc : count;
168 }
169
pci_perf_seq_open(struct inode * inode,struct file * filp)170 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
171 {
172 return single_open(filp, pci_perf_show,
173 file_inode(filp)->i_private);
174 }
175
176 static const struct file_operations debugfs_pci_perf_fops = {
177 .open = pci_perf_seq_open,
178 .read = seq_read,
179 .write = pci_perf_seq_write,
180 .llseek = seq_lseek,
181 .release = single_release,
182 };
183
zpci_debug_init_device(struct zpci_dev * zdev,const char * name)184 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
185 {
186 zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
187
188 debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
189 zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
190 }
191
zpci_debug_exit_device(struct zpci_dev * zdev)192 void zpci_debug_exit_device(struct zpci_dev *zdev)
193 {
194 debugfs_remove_recursive(zdev->debugfs_dev);
195 }
196
zpci_debug_init(void)197 int __init zpci_debug_init(void)
198 {
199 /* event trace buffer */
200 pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
201 if (!pci_debug_msg_id)
202 return -EINVAL;
203 debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
204 debug_set_level(pci_debug_msg_id, 3);
205
206 /* error log */
207 pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
208 if (!pci_debug_err_id)
209 return -EINVAL;
210 debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
211 debug_set_level(pci_debug_err_id, 3);
212
213 debugfs_root = debugfs_create_dir("pci", NULL);
214 return 0;
215 }
216
zpci_debug_exit(void)217 void zpci_debug_exit(void)
218 {
219 debug_unregister(pci_debug_msg_id);
220 debug_unregister(pci_debug_err_id);
221 debugfs_remove(debugfs_root);
222 }
223