qdio_debug.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  Copyright IBM Corp. 2008, 2009
  4 *
  5 *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
  6 */
  7#include <linux/seq_file.h>
  8#include <linux/debugfs.h>
  9#include <linux/uaccess.h>
 10#include <linux/slab.h>
 11#include <asm/debug.h>
 12#include "qdio_debug.h"
 13#include "qdio.h"
 14
 15debug_info_t *qdio_dbf_setup;
 16debug_info_t *qdio_dbf_error;
 17
 18static struct dentry *debugfs_root;
 19#define QDIO_DEBUGFS_NAME_LEN	10
 20#define QDIO_DBF_NAME_LEN	20
 21
 22struct qdio_dbf_entry {
 23	char dbf_name[QDIO_DBF_NAME_LEN];
 24	debug_info_t *dbf_info;
 25	struct list_head dbf_list;
 26};
 27
 28static LIST_HEAD(qdio_dbf_list);
 29static DEFINE_MUTEX(qdio_dbf_list_mutex);
 30
 31static debug_info_t *qdio_get_dbf_entry(char *name)
 32{
 33	struct qdio_dbf_entry *entry;
 34	debug_info_t *rc = NULL;
 35
 36	mutex_lock(&qdio_dbf_list_mutex);
 37	list_for_each_entry(entry, &qdio_dbf_list, dbf_list) {
 38		if (strcmp(entry->dbf_name, name) == 0) {
 39			rc = entry->dbf_info;
 40			break;
 41		}
 42	}
 43	mutex_unlock(&qdio_dbf_list_mutex);
 44	return rc;
 45}
 46
 47static void qdio_clear_dbf_list(void)
 48{
 49	struct qdio_dbf_entry *entry, *tmp;
 50
 51	mutex_lock(&qdio_dbf_list_mutex);
 52	list_for_each_entry_safe(entry, tmp, &qdio_dbf_list, dbf_list) {
 53		list_del(&entry->dbf_list);
 54		debug_unregister(entry->dbf_info);
 55		kfree(entry);
 56	}
 57	mutex_unlock(&qdio_dbf_list_mutex);
 58}
 59
 60int qdio_allocate_dbf(struct qdio_irq *irq_ptr)
 61{
 62	char text[QDIO_DBF_NAME_LEN];
 63	struct qdio_dbf_entry *new_entry;
 64
 65	DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr);
 66
 67	/* allocate trace view for the interface */
 68	snprintf(text, QDIO_DBF_NAME_LEN, "qdio_%s",
 69		 dev_name(&irq_ptr->cdev->dev));
 70	irq_ptr->debug_area = qdio_get_dbf_entry(text);
 71	if (irq_ptr->debug_area)
 72		DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf reused");
 73	else {
 74		irq_ptr->debug_area = debug_register(text, 2, 1, 16);
 75		if (!irq_ptr->debug_area)
 76			return -ENOMEM;
 77		if (debug_register_view(irq_ptr->debug_area,
 78						&debug_hex_ascii_view)) {
 79			debug_unregister(irq_ptr->debug_area);
 80			return -ENOMEM;
 81		}
 82		debug_set_level(irq_ptr->debug_area, DBF_WARN);
 83		DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created");
 84		new_entry = kzalloc(sizeof(struct qdio_dbf_entry), GFP_KERNEL);
 85		if (!new_entry) {
 86			debug_unregister(irq_ptr->debug_area);
 87			return -ENOMEM;
 88		}
 89		strscpy(new_entry->dbf_name, text, QDIO_DBF_NAME_LEN);
 90		new_entry->dbf_info = irq_ptr->debug_area;
 91		mutex_lock(&qdio_dbf_list_mutex);
 92		list_add(&new_entry->dbf_list, &qdio_dbf_list);
 93		mutex_unlock(&qdio_dbf_list_mutex);
 94	}
 95	return 0;
 96}
 97
 98static int qstat_show(struct seq_file *m, void *v)
 99{
100	unsigned char state;
101	struct qdio_q *q = m->private;
102	int i;
103
104	if (!q)
105		return 0;
106
107	seq_printf(m, "Timestamp: %llx\n", q->timestamp);
108	seq_printf(m, "Last Data IRQ: %llx  Last AI: %llx\n",
109		   q->irq_ptr->last_data_irq_time, last_ai_time);
110	seq_printf(m, "nr_used: %d  ftc: %d\n",
111		   atomic_read(&q->nr_buf_used), q->first_to_check);
112	if (q->is_input_q) {
113		seq_printf(m, "batch start: %u  batch count: %u\n",
114			   q->u.in.batch_start, q->u.in.batch_count);
115		seq_printf(m, "DSCI: %x   IRQs disabled: %u\n",
116			   *(u8 *)q->irq_ptr->dsci,
117			   test_bit(QDIO_IRQ_DISABLED,
118				    &q->irq_ptr->poll_state));
119	}
120	seq_printf(m, "SBAL states:\n");
121	seq_printf(m, "|0      |8      |16     |24     |32     |40     |48     |56  63|\n");
122
123	for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
124		debug_get_buf_state(q, i, &state);
125		switch (state) {
126		case SLSB_P_INPUT_NOT_INIT:
127		case SLSB_P_OUTPUT_NOT_INIT:
128			seq_printf(m, "N");
129			break;
130		case SLSB_P_OUTPUT_PENDING:
131			seq_printf(m, "P");
132			break;
133		case SLSB_P_INPUT_PRIMED:
134		case SLSB_CU_OUTPUT_PRIMED:
135			seq_printf(m, "+");
136			break;
137		case SLSB_P_INPUT_ACK:
138			seq_printf(m, "A");
139			break;
140		case SLSB_P_INPUT_ERROR:
141		case SLSB_P_OUTPUT_ERROR:
142			seq_printf(m, "x");
143			break;
144		case SLSB_CU_INPUT_EMPTY:
145		case SLSB_P_OUTPUT_EMPTY:
146			seq_printf(m, "-");
147			break;
148		case SLSB_P_INPUT_HALTED:
149		case SLSB_P_OUTPUT_HALTED:
150			seq_printf(m, ".");
151			break;
152		default:
153			seq_printf(m, "?");
154		}
155		if (i == 63)
156			seq_printf(m, "\n");
157	}
158	seq_printf(m, "\n");
159	seq_printf(m, "|64     |72     |80     |88     |96     |104    |112    |   127|\n");
160
161	seq_printf(m, "\nSBAL statistics:");
162	if (!q->irq_ptr->perf_stat_enabled) {
163		seq_printf(m, " disabled\n");
164		return 0;
165	}
166
167	seq_printf(m, "\n1          2..        4..        8..        "
168		   "16..       32..       64..       128\n");
169	for (i = 0; i < ARRAY_SIZE(q->q_stats.nr_sbals); i++)
170		seq_printf(m, "%-10u ", q->q_stats.nr_sbals[i]);
171	seq_printf(m, "\nError      NOP        Total\n%-10u %-10u %-10u\n\n",
172		   q->q_stats.nr_sbal_error, q->q_stats.nr_sbal_nop,
173		   q->q_stats.nr_sbal_total);
174	return 0;
175}
176
177DEFINE_SHOW_ATTRIBUTE(qstat);
178
179static int ssqd_show(struct seq_file *m, void *v)
180{
181	struct ccw_device *cdev = m->private;
182	struct qdio_ssqd_desc ssqd;
183	int rc;
184
185	rc = qdio_get_ssqd_desc(cdev, &ssqd);
186	if (rc)
187		return rc;
188
189	seq_hex_dump(m, "", DUMP_PREFIX_NONE, 16, 4, &ssqd, sizeof(ssqd),
190		     false);
191	return 0;
192}
193
194DEFINE_SHOW_ATTRIBUTE(ssqd);
195
196static char *qperf_names[] = {
197	"Assumed adapter interrupts",
198	"QDIO interrupts",
199	"SIGA read",
200	"SIGA write",
201	"SIGA sync",
202	"Inbound calls",
203	"Inbound stop_polling",
204	"Inbound queue full",
205	"Outbound calls",
206	"Outbound queue full",
207	"Outbound fast_requeue",
208	"Outbound target_full",
209	"QEBSM eqbs",
210	"QEBSM eqbs partial",
211	"QEBSM sqbs",
212	"QEBSM sqbs partial",
213	"Discarded interrupts"
214};
215
216static int qperf_show(struct seq_file *m, void *v)
217{
218	struct qdio_irq *irq_ptr = m->private;
219	unsigned int *stat;
220	int i;
221
222	if (!irq_ptr)
223		return 0;
224	if (!irq_ptr->perf_stat_enabled) {
225		seq_printf(m, "disabled\n");
226		return 0;
227	}
228	stat = (unsigned int *)&irq_ptr->perf_stat;
229
230	for (i = 0; i < ARRAY_SIZE(qperf_names); i++)
231		seq_printf(m, "%26s:\t%u\n",
232			   qperf_names[i], *(stat + i));
233	return 0;
234}
235
236static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf,
237			       size_t count, loff_t *off)
238{
239	struct seq_file *seq = file->private_data;
240	struct qdio_irq *irq_ptr = seq->private;
241	struct qdio_q *q;
242	unsigned long val;
243	int ret, i;
244
245	if (!irq_ptr)
246		return 0;
247
248	ret = kstrtoul_from_user(ubuf, count, 10, &val);
249	if (ret)
250		return ret;
251
252	switch (val) {
253	case 0:
254		irq_ptr->perf_stat_enabled = 0;
255		memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
256		for_each_input_queue(irq_ptr, q, i)
257			memset(&q->q_stats, 0, sizeof(q->q_stats));
258		for_each_output_queue(irq_ptr, q, i)
259			memset(&q->q_stats, 0, sizeof(q->q_stats));
260		break;
261	case 1:
262		irq_ptr->perf_stat_enabled = 1;
263		break;
264	}
265	return count;
266}
267
268static int qperf_seq_open(struct inode *inode, struct file *filp)
269{
270	return single_open(filp, qperf_show,
271			   file_inode(filp)->i_private);
272}
273
274static const struct file_operations debugfs_perf_fops = {
275	.owner	 = THIS_MODULE,
276	.open	 = qperf_seq_open,
277	.read	 = seq_read,
278	.write	 = qperf_seq_write,
279	.llseek  = seq_lseek,
280	.release = single_release,
281};
282
283static void setup_debugfs_entry(struct dentry *parent, struct qdio_q *q)
284{
285	char name[QDIO_DEBUGFS_NAME_LEN];
286
287	snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%d",
288		 q->is_input_q ? "input" : "output",
289		 q->nr);
290	debugfs_create_file(name, 0444, parent, q, &qstat_fops);
291}
292
293void qdio_setup_debug_entries(struct qdio_irq *irq_ptr)
294{
295	struct qdio_q *q;
296	int i;
297
298	irq_ptr->debugfs_dev = debugfs_create_dir(dev_name(&irq_ptr->cdev->dev),
299						  debugfs_root);
300	debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
301			    irq_ptr->debugfs_dev, irq_ptr, &debugfs_perf_fops);
302	debugfs_create_file("ssqd", 0444, irq_ptr->debugfs_dev, irq_ptr->cdev,
303			    &ssqd_fops);
304
305	for_each_input_queue(irq_ptr, q, i)
306		setup_debugfs_entry(irq_ptr->debugfs_dev, q);
307	for_each_output_queue(irq_ptr, q, i)
308		setup_debugfs_entry(irq_ptr->debugfs_dev, q);
309}
310
311void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr)
312{
313	debugfs_remove_recursive(irq_ptr->debugfs_dev);
314}
315
316int __init qdio_debug_init(void)
317{
318	debugfs_root = debugfs_create_dir("qdio", NULL);
319
320	qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
321	debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
322	debug_set_level(qdio_dbf_setup, DBF_INFO);
323	DBF_EVENT("dbf created\n");
324
325	qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
326	debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
327	debug_set_level(qdio_dbf_error, DBF_INFO);
328	DBF_ERROR("dbf created\n");
329	return 0;
330}
331
332void qdio_debug_exit(void)
333{
334	qdio_clear_dbf_list();
335	debugfs_remove_recursive(debugfs_root);
336	debug_unregister(qdio_dbf_setup);
337	debug_unregister(qdio_dbf_error);
338}