drivers/s390/cio/qdio_debug.c

   1 /*
   2  *  Copyright IBM Corp. 2008, 2009
   3  *
   4  *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
   5  */
   6 #include <linux/seq_file.h>
   7 #include <linux/debugfs.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/export.h>
  10 #include <asm/debug.h>
  11 #include "qdio_debug.h"
  12 #include "qdio.h"
  13
  14 debug_info_t *qdio_dbf_setup;
  15 debug_info_t *qdio_dbf_error;
  16
  17 static struct dentry *debugfs_root;
  18 #define QDIO_DEBUGFS_NAME_LEN   10
  19
  20 void qdio_allocate_dbf(struct qdio_initialize *init_data,
  21                        struct qdio_irq *irq_ptr)
  22 {
  23         char text[20];
  24
  25         DBF_EVENT("qfmt:%1d", init_data->q_format);
  26         DBF_HEX(init_data->adapter_name, 8);
  27         DBF_EVENT("qpff%4x", init_data->qib_param_field_format);
  28         DBF_HEX(&init_data->qib_param_field, sizeof(void *));
  29         DBF_HEX(&init_data->input_slib_elements, sizeof(void *));
  30         DBF_HEX(&init_data->output_slib_elements, sizeof(void *));
  31         DBF_EVENT("niq:%1d noq:%1d", init_data->no_input_qs,
  32                   init_data->no_output_qs);
  33         DBF_HEX(&init_data->input_handler, sizeof(void *));
  34         DBF_HEX(&init_data->output_handler, sizeof(void *));
  35         DBF_HEX(&init_data->int_parm, sizeof(long));
  36         DBF_HEX(&init_data->input_sbal_addr_array, sizeof(void *));
  37         DBF_HEX(&init_data->output_sbal_addr_array, sizeof(void *));
  38         DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr);
  39
  40         /* allocate trace view for the interface */
  41         snprintf(text, 20, "qdio_%s", dev_name(&init_data->cdev->dev));
  42         irq_ptr->debug_area = debug_register(text, 2, 1, 16);
  43         debug_register_view(irq_ptr->debug_area, &debug_hex_ascii_view);
  44         debug_set_level(irq_ptr->debug_area, DBF_WARN);
  45         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created");
  46 }
  47
  48 static int qstat_show(struct seq_file *m, void *v)
  49 {
  50         unsigned char state;
  51         struct qdio_q *q = m->private;
  52         int i;
  53
  54         if (!q)
  55                 return 0;
  56
  57         seq_printf(m, "Timestamp: %Lx  Last AI: %Lx\n",
  58                    q->timestamp, last_ai_time);
  59         seq_printf(m, "nr_used: %d  ftc: %d  last_move: %d\n",
  60                    atomic_read(&q->nr_buf_used),
  61                    q->first_to_check, q->last_move);
  62         if (q->is_input_q) {
  63                 seq_printf(m, "polling: %d  ack start: %d  ack count: %d\n",
  64                            q->u.in.polling, q->u.in.ack_start,
  65                            q->u.in.ack_count);
  66                 seq_printf(m, "DSCI: %d   IRQs disabled: %u\n",
  67                            *(u32 *)q->irq_ptr->dsci,
  68                            test_bit(QDIO_QUEUE_IRQS_DISABLED,
  69                            &q->u.in.queue_irq_state));
  70         }
  71         seq_printf(m, "SBAL states:\n");
  72         seq_printf(m, "|0      |8      |16     |24     |32     |40     |48     |56  63|\n");
  73
  74         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
  75                 debug_get_buf_state(q, i, &state);
  76                 switch (state) {
  77                 case SLSB_P_INPUT_NOT_INIT:
  78                 case SLSB_P_OUTPUT_NOT_INIT:
  79                         seq_printf(m, "N");
  80                         break;
  81                 case SLSB_P_OUTPUT_PENDING:
  82                         seq_printf(m, "P");
  83                         break;
  84                 case SLSB_P_INPUT_PRIMED:
  85                 case SLSB_CU_OUTPUT_PRIMED:
  86                         seq_printf(m, "+");
  87                         break;
  88                 case SLSB_P_INPUT_ACK:
  89                         seq_printf(m, "A");
  90                         break;
  91                 case SLSB_P_INPUT_ERROR:
  92                 case SLSB_P_OUTPUT_ERROR:
  93                         seq_printf(m, "x");
  94                         break;
  95                 case SLSB_CU_INPUT_EMPTY:
  96                 case SLSB_P_OUTPUT_EMPTY:
  97                         seq_printf(m, "-");
  98                         break;
  99                 case SLSB_P_INPUT_HALTED:
 100                 case SLSB_P_OUTPUT_HALTED:
 101                         seq_printf(m, ".");
 102                         break;
 103                 default:
 104                         seq_printf(m, "?");
 105                 }
 106                 if (i == 63)
 107                         seq_printf(m, "\n");
 108         }
 109         seq_printf(m, "\n");
 110         seq_printf(m, "|64     |72     |80     |88     |96     |104    |112    |   127|\n");
 111
 112         seq_printf(m, "\nSBAL statistics:");
 113         if (!q->irq_ptr->perf_stat_enabled) {
 114                 seq_printf(m, " disabled\n");
 115                 return 0;
 116         }
 117
 118         seq_printf(m, "\n1          2..        4..        8..        "
 119                    "16..       32..       64..       127\n");
 120         for (i = 0; i < ARRAY_SIZE(q->q_stats.nr_sbals); i++)
 121                 seq_printf(m, "%-10u ", q->q_stats.nr_sbals[i]);
 122         seq_printf(m, "\nError      NOP        Total\n%-10u %-10u %-10u\n\n",
 123                    q->q_stats.nr_sbal_error, q->q_stats.nr_sbal_nop,
 124                    q->q_stats.nr_sbal_total);
 125         return 0;
 126 }
 127
 128 static int qstat_seq_open(struct inode *inode, struct file *filp)
 129 {
 130         return single_open(filp, qstat_show,
 131                            file_inode(filp)->i_private);
 132 }
 133
 134 static const struct file_operations debugfs_fops = {
 135         .owner   = THIS_MODULE,
 136         .open    = qstat_seq_open,
 137         .read    = seq_read,
 138         .llseek  = seq_lseek,
 139         .release = single_release,
 140 };
 141
 142 static char *qperf_names[] = {
 143         "Assumed adapter interrupts",
 144         "QDIO interrupts",
 145         "Requested PCIs",
 146         "Inbound tasklet runs",
 147         "Inbound tasklet resched",
 148         "Inbound tasklet resched2",
 149         "Outbound tasklet runs",
 150         "SIGA read",
 151         "SIGA write",
 152         "SIGA sync",
 153         "Inbound calls",
 154         "Inbound handler",
 155         "Inbound stop_polling",
 156         "Inbound queue full",
 157         "Outbound calls",
 158         "Outbound handler",
 159         "Outbound queue full",
 160         "Outbound fast_requeue",
 161         "Outbound target_full",
 162         "QEBSM eqbs",
 163         "QEBSM eqbs partial",
 164         "QEBSM sqbs",
 165         "QEBSM sqbs partial",
 166         "Discarded interrupts"
 167 };
 168
 169 static int qperf_show(struct seq_file *m, void *v)
 170 {
 171         struct qdio_irq *irq_ptr = m->private;
 172         unsigned int *stat;
 173         int i;
 174
 175         if (!irq_ptr)
 176                 return 0;
 177         if (!irq_ptr->perf_stat_enabled) {
 178                 seq_printf(m, "disabled\n");
 179                 return 0;
 180         }
 181         stat = (unsigned int *)&irq_ptr->perf_stat;
 182
 183         for (i = 0; i < ARRAY_SIZE(qperf_names); i++)
 184                 seq_printf(m, "%26s:\t%u\n",
 185                            qperf_names[i], *(stat + i));
 186         return 0;
 187 }
 188
 189 static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf,
 190                                size_t count, loff_t *off)
 191 {
 192         struct seq_file *seq = file->private_data;
 193         struct qdio_irq *irq_ptr = seq->private;
 194         struct qdio_q *q;
 195         unsigned long val;
 196         int ret, i;
 197
 198         if (!irq_ptr)
 199                 return 0;
 200
 201         ret = kstrtoul_from_user(ubuf, count, 10, &val);
 202         if (ret)
 203                 return ret;
 204
 205         switch (val) {
 206         case 0:
 207                 irq_ptr->perf_stat_enabled = 0;
 208                 memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 209                 for_each_input_queue(irq_ptr, q, i)
 210                         memset(&q->q_stats, 0, sizeof(q->q_stats));
 211                 for_each_output_queue(irq_ptr, q, i)
 212                         memset(&q->q_stats, 0, sizeof(q->q_stats));
 213                 break;
 214         case 1:
 215                 irq_ptr->perf_stat_enabled = 1;
 216                 break;
 217         }
 218         return count;
 219 }
 220
 221 static int qperf_seq_open(struct inode *inode, struct file *filp)
 222 {
 223         return single_open(filp, qperf_show,
 224                            file_inode(filp)->i_private);
 225 }
 226
 227 static struct file_operations debugfs_perf_fops = {
 228         .owner   = THIS_MODULE,
 229         .open    = qperf_seq_open,
 230         .read    = seq_read,
 231         .write   = qperf_seq_write,
 232         .llseek  = seq_lseek,
 233         .release = single_release,
 234 };
 235 static void setup_debugfs_entry(struct qdio_q *q, struct ccw_device *cdev)
 236 {
 237         char name[QDIO_DEBUGFS_NAME_LEN];
 238
 239         snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%d",
 240                  q->is_input_q ? "input" : "output",
 241                  q->nr);
 242         q->debugfs_q = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR,
 243                                 q->irq_ptr->debugfs_dev, q, &debugfs_fops);
 244         if (IS_ERR(q->debugfs_q))
 245                 q->debugfs_q = NULL;
 246 }
 247
 248 void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 249 {
 250         struct qdio_q *q;
 251         int i;
 252
 253         irq_ptr->debugfs_dev = debugfs_create_dir(dev_name(&cdev->dev),
 254                                                   debugfs_root);
 255         if (IS_ERR(irq_ptr->debugfs_dev))
 256                 irq_ptr->debugfs_dev = NULL;
 257
 258         irq_ptr->debugfs_perf = debugfs_create_file("statistics",
 259                                 S_IFREG | S_IRUGO | S_IWUSR,
 260                                 irq_ptr->debugfs_dev, irq_ptr,
 261                                 &debugfs_perf_fops);
 262         if (IS_ERR(irq_ptr->debugfs_perf))
 263                 irq_ptr->debugfs_perf = NULL;
 264
 265         for_each_input_queue(irq_ptr, q, i)
 266                 setup_debugfs_entry(q, cdev);
 267         for_each_output_queue(irq_ptr, q, i)
 268                 setup_debugfs_entry(q, cdev);
 269 }
 270
 271 void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 272 {
 273         struct qdio_q *q;
 274         int i;
 275
 276         for_each_input_queue(irq_ptr, q, i)
 277                 debugfs_remove(q->debugfs_q);
 278         for_each_output_queue(irq_ptr, q, i)
 279                 debugfs_remove(q->debugfs_q);
 280         debugfs_remove(irq_ptr->debugfs_perf);
 281         debugfs_remove(irq_ptr->debugfs_dev);
 282 }
 283
 284 int __init qdio_debug_init(void)
 285 {
 286         debugfs_root = debugfs_create_dir("qdio", NULL);
 287
 288         qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
 289         debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
 290         debug_set_level(qdio_dbf_setup, DBF_INFO);
 291         DBF_EVENT("dbf created\n");
 292
 293         qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
 294         debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
 295         debug_set_level(qdio_dbf_error, DBF_INFO);
 296         DBF_ERROR("dbf created\n");
 297         return 0;
 298 }
 299
 300 void qdio_debug_exit(void)
 301 {
 302         debugfs_remove(debugfs_root);
 303         if (qdio_dbf_setup)
 304                 debug_unregister(qdio_dbf_setup);
 305         if (qdio_dbf_error)
 306                 debug_unregister(qdio_dbf_error);
 307 }