drivers/s390/cio/qdio_debug.c

   1 /*
   2  *  drivers/s390/cio/qdio_debug.c
   3  *
   4  *  Copyright IBM Corp. 2008,2009
   5  *
   6  *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
   7  */
   8 #include <linux/seq_file.h>
   9 #include <linux/debugfs.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->flags, sizeof(long));
  37         DBF_HEX(&init_data->input_sbal_addr_array, sizeof(void *));
  38         DBF_HEX(&init_data->output_sbal_addr_array, sizeof(void *));
  39         DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr);
  40
  41         /* allocate trace view for the interface */
  42         snprintf(text, 20, "qdio_%s", dev_name(&init_data->cdev->dev));
  43         irq_ptr->debug_area = debug_register(text, 2, 1, 16);
  44         debug_register_view(irq_ptr->debug_area, &debug_hex_ascii_view);
  45         debug_set_level(irq_ptr->debug_area, DBF_WARN);
  46         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created");
  47 }
  48
  49 static int qstat_show(struct seq_file *m, void *v)
  50 {
  51         unsigned char state;
  52         struct qdio_q *q = m->private;
  53         int i;
  54
  55         if (!q)
  56                 return 0;
  57
  58         seq_printf(m, "device state indicator: %d\n", *(u32 *)q->irq_ptr->dsci);
  59         seq_printf(m, "nr_used: %d\n", atomic_read(&q->nr_buf_used));
  60         seq_printf(m, "ftc: %d\n", q->first_to_check);
  61         seq_printf(m, "last_move: %d\n", q->last_move);
  62         seq_printf(m, "polling: %d\n", q->u.in.polling);
  63         seq_printf(m, "ack start: %d\n", q->u.in.ack_start);
  64         seq_printf(m, "ack count: %d\n", q->u.in.ack_count);
  65         seq_printf(m, "slsb buffer states:\n");
  66         seq_printf(m, "|0      |8      |16     |24     |32     |40     |48     |56  63|\n");
  67
  68         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
  69                 debug_get_buf_state(q, i, &state);
  70                 switch (state) {
  71                 case SLSB_P_INPUT_NOT_INIT:
  72                 case SLSB_P_OUTPUT_NOT_INIT:
  73                         seq_printf(m, "N");
  74                         break;
  75                 case SLSB_P_INPUT_PRIMED:
  76                 case SLSB_CU_OUTPUT_PRIMED:
  77                         seq_printf(m, "+");
  78                         break;
  79                 case SLSB_P_INPUT_ACK:
  80                         seq_printf(m, "A");
  81                         break;
  82                 case SLSB_P_INPUT_ERROR:
  83                 case SLSB_P_OUTPUT_ERROR:
  84                         seq_printf(m, "x");
  85                         break;
  86                 case SLSB_CU_INPUT_EMPTY:
  87                 case SLSB_P_OUTPUT_EMPTY:
  88                         seq_printf(m, "-");
  89                         break;
  90                 case SLSB_P_INPUT_HALTED:
  91                 case SLSB_P_OUTPUT_HALTED:
  92                         seq_printf(m, ".");
  93                         break;
  94                 default:
  95                         seq_printf(m, "?");
  96                 }
  97                 if (i == 63)
  98                         seq_printf(m, "\n");
  99         }
 100         seq_printf(m, "\n");
 101         seq_printf(m, "|64     |72     |80     |88     |96     |104    |112    |   127|\n");
 102         return 0;
 103 }
 104
 105 static ssize_t qstat_seq_write(struct file *file, const char __user *buf,
 106                                size_t count, loff_t *off)
 107 {
 108         struct seq_file *seq = file->private_data;
 109         struct qdio_q *q = seq->private;
 110
 111         if (!q)
 112                 return 0;
 113
 114         if (q->is_input_q)
 115                 xchg(q->irq_ptr->dsci, 1);
 116         local_bh_disable();
 117         tasklet_schedule(&q->tasklet);
 118         local_bh_enable();
 119         return count;
 120 }
 121
 122 static int qstat_seq_open(struct inode *inode, struct file *filp)
 123 {
 124         return single_open(filp, qstat_show,
 125                            filp->f_path.dentry->d_inode->i_private);
 126 }
 127
 128 static const struct file_operations debugfs_fops = {
 129         .owner   = THIS_MODULE,
 130         .open    = qstat_seq_open,
 131         .read    = seq_read,
 132         .write   = qstat_seq_write,
 133         .llseek  = seq_lseek,
 134         .release = single_release,
 135 };
 136
 137 static void setup_debugfs_entry(struct qdio_q *q, struct ccw_device *cdev)
 138 {
 139         char name[QDIO_DEBUGFS_NAME_LEN];
 140
 141         snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%d",
 142                  q->is_input_q ? "input" : "output",
 143                  q->nr);
 144         q->debugfs_q = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR,
 145                                 q->irq_ptr->debugfs_dev, q, &debugfs_fops);
 146         if (IS_ERR(q->debugfs_q))
 147                 q->debugfs_q = NULL;
 148 }
 149
 150 void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 151 {
 152         struct qdio_q *q;
 153         int i;
 154
 155         irq_ptr->debugfs_dev = debugfs_create_dir(dev_name(&cdev->dev),
 156                                                   debugfs_root);
 157         if (IS_ERR(irq_ptr->debugfs_dev))
 158                 irq_ptr->debugfs_dev = NULL;
 159         for_each_input_queue(irq_ptr, q, i)
 160                 setup_debugfs_entry(q, cdev);
 161         for_each_output_queue(irq_ptr, q, i)
 162                 setup_debugfs_entry(q, cdev);
 163 }
 164
 165 void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 166 {
 167         struct qdio_q *q;
 168         int i;
 169
 170         for_each_input_queue(irq_ptr, q, i)
 171                 debugfs_remove(q->debugfs_q);
 172         for_each_output_queue(irq_ptr, q, i)
 173                 debugfs_remove(q->debugfs_q);
 174         debugfs_remove(irq_ptr->debugfs_dev);
 175 }
 176
 177 int __init qdio_debug_init(void)
 178 {
 179         debugfs_root = debugfs_create_dir("qdio", NULL);
 180
 181         qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
 182         debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
 183         debug_set_level(qdio_dbf_setup, DBF_INFO);
 184         DBF_EVENT("dbf created\n");
 185
 186         qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
 187         debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
 188         debug_set_level(qdio_dbf_error, DBF_INFO);
 189         DBF_ERROR("dbf created\n");
 190         return 0;
 191 }
 192
 193 void qdio_debug_exit(void)
 194 {
 195         debugfs_remove(debugfs_root);
 196         if (qdio_dbf_setup)
 197                 debug_unregister(qdio_dbf_setup);
 198         if (qdio_dbf_error)
 199                 debug_unregister(qdio_dbf_error);
 200 }