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
20static struct dentry *debugfs_root;
21debug_info_t *pci_debug_msg_id;
22EXPORT_SYMBOL_GPL(pci_debug_msg_id);
23debug_info_t *pci_debug_err_id;
24EXPORT_SYMBOL_GPL(pci_debug_err_id);
25
26static 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};
35
36static char *pci_sw_names[] = {
37	"Allocated pages",
38	"Mapped pages",
39	"Unmapped pages",
40};
41
42static void pci_sw_counter_show(struct seq_file *m)
43{
44	struct zpci_dev *zdev = m->private;
45	atomic64_t *counter = &zdev->allocated_pages;
46	int i;
47
48	for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
49		seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
50			   atomic64_read(counter));
51}
52
53static int pci_perf_show(struct seq_file *m, void *v)
54{
55	struct zpci_dev *zdev = m->private;
56	u64 *stat;
57	int i;
58
59	if (!zdev)
60		return 0;
61
62	mutex_lock(&zdev->lock);
63	if (!zdev->fmb) {
64		mutex_unlock(&zdev->lock);
65		seq_puts(m, "FMB statistics disabled\n");
66		return 0;
67	}
68
69	/* header */
70	seq_printf(m, "FMB @ %p\n", zdev->fmb);
71	seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
72	seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
73	seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
74
75	/* hardware counters */
76	stat = (u64 *) &zdev->fmb->ld_ops;
77	for (i = 0; i < 4; i++)
78		seq_printf(m, "%26s:\t%llu\n",
79			   pci_perf_names[i], *(stat + i));
80	if (zdev->fmb->dma_valid)
81		for (i = 4; i < 6; i++)
82			seq_printf(m, "%26s:\t%llu\n",
83				   pci_perf_names[i], *(stat + i));
84
85	pci_sw_counter_show(m);
86	mutex_unlock(&zdev->lock);
87	return 0;
88}
89
90static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
91				  size_t count, loff_t *off)
92{
93	struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
94	unsigned long val;
95	int rc;
96
97	if (!zdev)
98		return 0;
99
100	rc = kstrtoul_from_user(ubuf, count, 10, &val);
101	if (rc)
102		return rc;
103
104	mutex_lock(&zdev->lock);
105	switch (val) {
106	case 0:
107		rc = zpci_fmb_disable_device(zdev);
108		break;
109	case 1:
110		rc = zpci_fmb_enable_device(zdev);
111		break;
112	}
113	mutex_unlock(&zdev->lock);
114	return rc ? rc : count;
115}
116
117static int pci_perf_seq_open(struct inode *inode, struct file *filp)
118{
119	return single_open(filp, pci_perf_show,
120			   file_inode(filp)->i_private);
121}
122
123static const struct file_operations debugfs_pci_perf_fops = {
124	.open	 = pci_perf_seq_open,
125	.read	 = seq_read,
126	.write	 = pci_perf_seq_write,
127	.llseek  = seq_lseek,
128	.release = single_release,
129};
130
131void zpci_debug_init_device(struct zpci_dev *zdev)
132{
133	zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
134					       debugfs_root);
135	if (IS_ERR(zdev->debugfs_dev))
136		zdev->debugfs_dev = NULL;
137
138	zdev->debugfs_perf = debugfs_create_file("statistics",
139				S_IFREG | S_IRUGO | S_IWUSR,
140				zdev->debugfs_dev, zdev,
141				&debugfs_pci_perf_fops);
142	if (IS_ERR(zdev->debugfs_perf))
143		zdev->debugfs_perf = NULL;
144}
145
146void zpci_debug_exit_device(struct zpci_dev *zdev)
147{
148	debugfs_remove(zdev->debugfs_perf);
149	debugfs_remove(zdev->debugfs_dev);
150}
151
152int __init zpci_debug_init(void)
153{
154	/* event trace buffer */
155	pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
156	if (!pci_debug_msg_id)
157		return -EINVAL;
158	debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
159	debug_set_level(pci_debug_msg_id, 3);
160
161	/* error log */
162	pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
163	if (!pci_debug_err_id)
164		return -EINVAL;
165	debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
166	debug_set_level(pci_debug_err_id, 6);
167
168	debugfs_root = debugfs_create_dir("pci", NULL);
169	return 0;
170}
171
172void zpci_debug_exit(void)
173{
174	debug_unregister(pci_debug_msg_id);
175	debug_unregister(pci_debug_err_id);
176	debugfs_remove(debugfs_root);
177}
178