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
 21static struct dentry *debugfs_root;
 22debug_info_t *pci_debug_msg_id;
 23EXPORT_SYMBOL_GPL(pci_debug_msg_id);
 24debug_info_t *pci_debug_err_id;
 25EXPORT_SYMBOL_GPL(pci_debug_err_id);
 26
 27static char *pci_common_names[] = {
 28	"Load operations",
 29	"Store operations",
 30	"Store block operations",
 31	"Refresh operations",
 32};
 33
 34static char *pci_fmt0_names[] = {
 35	"DMA read bytes",
 36	"DMA write bytes",
 37};
 38
 39static char *pci_fmt1_names[] = {
 40	"Received bytes",
 41	"Received packets",
 42	"Transmitted bytes",
 43	"Transmitted packets",
 44};
 45
 46static char *pci_fmt2_names[] = {
 47	"Consumed work units",
 48	"Maximum work units",
 49};
 50
 51static char *pci_fmt3_names[] = {
 52	"Transmitted bytes",
 53};
 54
 55static char *pci_sw_names[] = {
 56	"Mapped pages",
 57	"Unmapped pages",
 58	"Global RPCITs",
 59	"Sync Map RPCITs",
 60	"Sync RPCITs",
 61};
 62
 63static 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
 72static 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));
 89unlock:
 90	spin_unlock_irqrestore(&zdev->dom_lock, flags);
 91}
 92
 93static 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
143static 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
170static 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
176static 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
184void 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
192void zpci_debug_exit_device(struct zpci_dev *zdev)
193{
194	debugfs_remove_recursive(zdev->debugfs_dev);
195}
196
197int __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
217void 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}