drivers/s390/cio/qdio_debug.c

   1 /*
   2  *  drivers/s390/cio/qdio_debug.c
   3  *
   4  *  Copyright IBM Corp. 2008
   5  *
   6  *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
   7  */
   8 #include <linux/proc_fs.h>
   9 #include <linux/seq_file.h>
  10 #include <linux/debugfs.h>
  11 #include <asm/qdio.h>
  12 #include <asm/debug.h>
  13 #include "qdio_debug.h"
  14 #include "qdio.h"
  15
  16 debug_info_t *qdio_dbf_setup;
  17 debug_info_t *qdio_dbf_trace;
  18
  19 static struct dentry *debugfs_root;
  20 #define MAX_DEBUGFS_QUEUES      32
  21 static struct dentry *debugfs_queues[MAX_DEBUGFS_QUEUES] = { NULL };
  22 static DEFINE_MUTEX(debugfs_mutex);
  23
  24 void qdio_allocate_do_dbf(struct qdio_initialize *init_data)
  25 {
  26         char dbf_text[20];
  27
  28         sprintf(dbf_text, "qfmt:%x", init_data->q_format);
  29         QDIO_DBF_TEXT0(0, setup, dbf_text);
  30         QDIO_DBF_HEX0(0, setup, init_data->adapter_name, 8);
  31         sprintf(dbf_text, "qpff%4x", init_data->qib_param_field_format);
  32         QDIO_DBF_TEXT0(0, setup, dbf_text);
  33         QDIO_DBF_HEX0(0, setup, &init_data->qib_param_field, sizeof(void *));
  34         QDIO_DBF_HEX0(0, setup, &init_data->input_slib_elements, sizeof(void *));
  35         QDIO_DBF_HEX0(0, setup, &init_data->output_slib_elements, sizeof(void *));
  36         sprintf(dbf_text, "niq:%4x", init_data->no_input_qs);
  37         QDIO_DBF_TEXT0(0, setup, dbf_text);
  38         sprintf(dbf_text, "noq:%4x", init_data->no_output_qs);
  39         QDIO_DBF_TEXT0(0, setup, dbf_text);
  40         QDIO_DBF_HEX0(0, setup, &init_data->input_handler, sizeof(void *));
  41         QDIO_DBF_HEX0(0, setup, &init_data->output_handler, sizeof(void *));
  42         QDIO_DBF_HEX0(0, setup, &init_data->int_parm, sizeof(long));
  43         QDIO_DBF_HEX0(0, setup, &init_data->flags, sizeof(long));
  44         QDIO_DBF_HEX0(0, setup, &init_data->input_sbal_addr_array, sizeof(void *));
  45         QDIO_DBF_HEX0(0, setup, &init_data->output_sbal_addr_array, sizeof(void *));
  46 }
  47
  48 static void qdio_unregister_dbf_views(void)
  49 {
  50         if (qdio_dbf_setup)
  51                 debug_unregister(qdio_dbf_setup);
  52         if (qdio_dbf_trace)
  53                 debug_unregister(qdio_dbf_trace);
  54 }
  55
  56 static int qdio_register_dbf_views(void)
  57 {
  58         qdio_dbf_setup = debug_register("qdio_setup", QDIO_DBF_SETUP_PAGES,
  59                                         QDIO_DBF_SETUP_NR_AREAS,
  60                                         QDIO_DBF_SETUP_LEN);
  61         if (!qdio_dbf_setup)
  62                 goto oom;
  63         debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
  64         debug_set_level(qdio_dbf_setup, QDIO_DBF_SETUP_LEVEL);
  65
  66         qdio_dbf_trace = debug_register("qdio_trace", QDIO_DBF_TRACE_PAGES,
  67                                         QDIO_DBF_TRACE_NR_AREAS,
  68                                         QDIO_DBF_TRACE_LEN);
  69         if (!qdio_dbf_trace)
  70                 goto oom;
  71         debug_register_view(qdio_dbf_trace, &debug_hex_ascii_view);
  72         debug_set_level(qdio_dbf_trace, QDIO_DBF_TRACE_LEVEL);
  73         return 0;
  74 oom:
  75         qdio_unregister_dbf_views();
  76         return -ENOMEM;
  77 }
  78
  79 static int qstat_show(struct seq_file *m, void *v)
  80 {
  81         unsigned char state;
  82         struct qdio_q *q = m->private;
  83         int i;
  84
  85         if (!q)
  86                 return 0;
  87
  88         seq_printf(m, "device state indicator: %d\n", *q->irq_ptr->dsci);
  89         seq_printf(m, "nr_used: %d\n", atomic_read(&q->nr_buf_used));
  90         seq_printf(m, "ftc: %d\n", q->first_to_check);
  91         seq_printf(m, "last_move_ftc: %d\n", q->last_move_ftc);
  92         seq_printf(m, "polling: %d\n", q->u.in.polling);
  93         seq_printf(m, "slsb buffer states:\n");
  94
  95         qdio_siga_sync_q(q);
  96         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
  97                 get_buf_state(q, i, &state);
  98                 switch (state) {
  99                 case SLSB_P_INPUT_NOT_INIT:
 100                 case SLSB_P_OUTPUT_NOT_INIT:
 101                         seq_printf(m, "N");
 102                         break;
 103                 case SLSB_P_INPUT_PRIMED:
 104                 case SLSB_CU_OUTPUT_PRIMED:
 105                         seq_printf(m, "+");
 106                         break;
 107                 case SLSB_P_INPUT_ACK:
 108                         seq_printf(m, "A");
 109                         break;
 110                 case SLSB_P_INPUT_ERROR:
 111                 case SLSB_P_OUTPUT_ERROR:
 112                         seq_printf(m, "x");
 113                         break;
 114                 case SLSB_CU_INPUT_EMPTY:
 115                 case SLSB_P_OUTPUT_EMPTY:
 116                         seq_printf(m, "-");
 117                         break;
 118                 case SLSB_P_INPUT_HALTED:
 119                 case SLSB_P_OUTPUT_HALTED:
 120                         seq_printf(m, ".");
 121                         break;
 122                 default:
 123                         seq_printf(m, "?");
 124                 }
 125                 if (i == 63)
 126                         seq_printf(m, "\n");
 127         }
 128         seq_printf(m, "\n");
 129         return 0;
 130 }
 131
 132 static ssize_t qstat_seq_write(struct file *file, const char __user *buf,
 133                                size_t count, loff_t *off)
 134 {
 135         struct seq_file *seq = file->private_data;
 136         struct qdio_q *q = seq->private;
 137
 138         if (!q)
 139                 return 0;
 140
 141         if (q->is_input_q)
 142                 xchg(q->irq_ptr->dsci, 1);
 143         local_bh_disable();
 144         tasklet_schedule(&q->tasklet);
 145         local_bh_enable();
 146         return count;
 147 }
 148
 149 static int qstat_seq_open(struct inode *inode, struct file *filp)
 150 {
 151         return single_open(filp, qstat_show,
 152                            filp->f_path.dentry->d_inode->i_private);
 153 }
 154
 155 static void get_queue_name(struct qdio_q *q, struct ccw_device *cdev, char *name)
 156 {
 157         memset(name, 0, sizeof(name));
 158         sprintf(name, "%s", dev_name(&cdev->dev));
 159         if (q->is_input_q)
 160                 sprintf(name + strlen(name), "_input");
 161         else
 162                 sprintf(name + strlen(name), "_output");
 163         sprintf(name + strlen(name), "_%d", q->nr);
 164 }
 165
 166 static void remove_debugfs_entry(struct qdio_q *q)
 167 {
 168         int i;
 169
 170         for (i = 0; i < MAX_DEBUGFS_QUEUES; i++) {
 171                 if (!debugfs_queues[i])
 172                         continue;
 173                 if (debugfs_queues[i]->d_inode->i_private == q) {
 174                         debugfs_remove(debugfs_queues[i]);
 175                         debugfs_queues[i] = NULL;
 176                 }
 177         }
 178 }
 179
 180 static struct file_operations debugfs_fops = {
 181         .owner   = THIS_MODULE,
 182         .open    = qstat_seq_open,
 183         .read    = seq_read,
 184         .write   = qstat_seq_write,
 185         .llseek  = seq_lseek,
 186         .release = single_release,
 187 };
 188
 189 static void setup_debugfs_entry(struct qdio_q *q, struct ccw_device *cdev)
 190 {
 191         int i = 0;
 192         char name[40];
 193
 194         while (debugfs_queues[i] != NULL) {
 195                 i++;
 196                 if (i >= MAX_DEBUGFS_QUEUES)
 197                         return;
 198         }
 199         get_queue_name(q, cdev, name);
 200         debugfs_queues[i] = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR,
 201                                                 debugfs_root, q, &debugfs_fops);
 202 }
 203
 204 void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 205 {
 206         struct qdio_q *q;
 207         int i;
 208
 209         mutex_lock(&debugfs_mutex);
 210         for_each_input_queue(irq_ptr, q, i)
 211                 setup_debugfs_entry(q, cdev);
 212         for_each_output_queue(irq_ptr, q, i)
 213                 setup_debugfs_entry(q, cdev);
 214         mutex_unlock(&debugfs_mutex);
 215 }
 216
 217 void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 218 {
 219         struct qdio_q *q;
 220         int i;
 221
 222         mutex_lock(&debugfs_mutex);
 223         for_each_input_queue(irq_ptr, q, i)
 224                 remove_debugfs_entry(q);
 225         for_each_output_queue(irq_ptr, q, i)
 226                 remove_debugfs_entry(q);
 227         mutex_unlock(&debugfs_mutex);
 228 }
 229
 230 int __init qdio_debug_init(void)
 231 {
 232         debugfs_root = debugfs_create_dir("qdio_queues", NULL);
 233         return qdio_register_dbf_views();
 234 }
 235
 236 void qdio_debug_exit(void)
 237 {
 238         debugfs_remove(debugfs_root);
 239         qdio_unregister_dbf_views();
 240 }