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, fmt: "%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, fmt: "%26s:\t%llu\n" , pci_sw_names[i], |
84 | atomic64_read(v: 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->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 | |
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(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 | |
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(f: 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, 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 | |
186 | void zpci_debug_exit_device(struct zpci_dev *zdev) |
187 | { |
188 | debugfs_remove_recursive(dentry: 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(name: "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(dentry: debugfs_root); |
216 | } |
217 | |