Merge tag 'iwlwifi-next-for-kalle-2014-12-30' of https://git.kernel.org/pub/scm/linux...
[cascardo/linux.git] / arch / s390 / pci / pci_debug.c
1 /*
2  *  Copyright IBM Corp. 2012
3  *
4  *  Author(s):
5  *    Jan Glauber <jang@linux.vnet.ibm.com>
6  */
7
8 #define KMSG_COMPONENT "zpci"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11 #include <linux/kernel.h>
12 #include <linux/seq_file.h>
13 #include <linux/debugfs.h>
14 #include <linux/export.h>
15 #include <linux/pci.h>
16 #include <asm/debug.h>
17
18 #include <asm/pci_dma.h>
19
20 static struct dentry *debugfs_root;
21 debug_info_t *pci_debug_msg_id;
22 EXPORT_SYMBOL_GPL(pci_debug_msg_id);
23 debug_info_t *pci_debug_err_id;
24 EXPORT_SYMBOL_GPL(pci_debug_err_id);
25
26 static char *pci_perf_names[] = {
27         /* hardware counters */
28         "Load operations",
29         "Store operations",
30         "Store block operations",
31         "Refresh operations",
32         "DMA read bytes",
33         "DMA write bytes",
34         /* software counters */
35         "Allocated pages",
36         "Mapped pages",
37         "Unmapped pages",
38 };
39
40 static int pci_perf_show(struct seq_file *m, void *v)
41 {
42         struct zpci_dev *zdev = m->private;
43         u64 *stat;
44         int i;
45
46         if (!zdev)
47                 return 0;
48         if (!zdev->fmb)
49                 return seq_printf(m, "FMB statistics disabled\n");
50
51         /* header */
52         seq_printf(m, "FMB @ %p\n", zdev->fmb);
53         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
54         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
55         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
56
57         /* hardware counters */
58         stat = (u64 *) &zdev->fmb->ld_ops;
59         for (i = 0; i < 4; i++)
60                 seq_printf(m, "%26s:\t%llu\n",
61                            pci_perf_names[i], *(stat + i));
62         if (zdev->fmb->dma_valid)
63                 for (i = 4; i < 6; i++)
64                         seq_printf(m, "%26s:\t%llu\n",
65                                    pci_perf_names[i], *(stat + i));
66         /* software counters */
67         for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++)
68                 seq_printf(m, "%26s:\t%llu\n",
69                            pci_perf_names[i],
70                            atomic64_read((atomic64_t *) (stat + i)));
71
72         return 0;
73 }
74
75 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
76                                   size_t count, loff_t *off)
77 {
78         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
79         unsigned long val;
80         int rc;
81
82         if (!zdev)
83                 return 0;
84
85         rc = kstrtoul_from_user(ubuf, count, 10, &val);
86         if (rc)
87                 return rc;
88
89         switch (val) {
90         case 0:
91                 rc = zpci_fmb_disable_device(zdev);
92                 if (rc)
93                         return rc;
94                 break;
95         case 1:
96                 rc = zpci_fmb_enable_device(zdev);
97                 if (rc)
98                         return rc;
99                 break;
100         }
101         return count;
102 }
103
104 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
105 {
106         return single_open(filp, pci_perf_show,
107                            file_inode(filp)->i_private);
108 }
109
110 static const struct file_operations debugfs_pci_perf_fops = {
111         .open    = pci_perf_seq_open,
112         .read    = seq_read,
113         .write   = pci_perf_seq_write,
114         .llseek  = seq_lseek,
115         .release = single_release,
116 };
117
118 void zpci_debug_init_device(struct zpci_dev *zdev)
119 {
120         zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
121                                                debugfs_root);
122         if (IS_ERR(zdev->debugfs_dev))
123                 zdev->debugfs_dev = NULL;
124
125         zdev->debugfs_perf = debugfs_create_file("statistics",
126                                 S_IFREG | S_IRUGO | S_IWUSR,
127                                 zdev->debugfs_dev, zdev,
128                                 &debugfs_pci_perf_fops);
129         if (IS_ERR(zdev->debugfs_perf))
130                 zdev->debugfs_perf = NULL;
131 }
132
133 void zpci_debug_exit_device(struct zpci_dev *zdev)
134 {
135         debugfs_remove(zdev->debugfs_perf);
136         debugfs_remove(zdev->debugfs_dev);
137 }
138
139 int __init zpci_debug_init(void)
140 {
141         /* event trace buffer */
142         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
143         if (!pci_debug_msg_id)
144                 return -EINVAL;
145         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
146         debug_set_level(pci_debug_msg_id, 3);
147
148         /* error log */
149         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
150         if (!pci_debug_err_id)
151                 return -EINVAL;
152         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
153         debug_set_level(pci_debug_err_id, 6);
154
155         debugfs_root = debugfs_create_dir("pci", NULL);
156         return 0;
157 }
158
159 void zpci_debug_exit(void)
160 {
161         debug_unregister(pci_debug_msg_id);
162         debug_unregister(pci_debug_err_id);
163         debugfs_remove(debugfs_root);
164 }