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_error;
  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 #define QDIO_DEBUGFS_NAME_LEN   40
  24
  25 void qdio_allocate_dbf(struct qdio_initialize *init_data,
  26                        struct qdio_irq *irq_ptr)
  27 {
  28         char text[20];
  29
  30         DBF_EVENT("qfmt:%1d", init_data->q_format);
  31         DBF_HEX(init_data->adapter_name, 8);
  32         DBF_EVENT("qpff%4x", init_data->qib_param_field_format);
  33         DBF_HEX(&init_data->qib_param_field, sizeof(void *));
  34         DBF_HEX(&init_data->input_slib_elements, sizeof(void *));
  35         DBF_HEX(&init_data->output_slib_elements, sizeof(void *));
  36         DBF_EVENT("niq:%1d noq:%1d", init_data->no_input_qs,
  37                   init_data->no_output_qs);
  38         DBF_HEX(&init_data->input_handler, sizeof(void *));
  39         DBF_HEX(&init_data->output_handler, sizeof(void *));
  40         DBF_HEX(&init_data->int_parm, sizeof(long));
  41         DBF_HEX(&init_data->flags, sizeof(long));
  42         DBF_HEX(&init_data->input_sbal_addr_array, sizeof(void *));
  43         DBF_HEX(&init_data->output_sbal_addr_array, sizeof(void *));
  44         DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr);
  45
  46         /* allocate trace view for the interface */
  47         snprintf(text, 20, "qdio_%s", dev_name(&init_data->cdev->dev));
  48         irq_ptr->debug_area = debug_register(text, 2, 1, 16);
  49         debug_register_view(irq_ptr->debug_area, &debug_hex_ascii_view);
  50         debug_set_level(irq_ptr->debug_area, DBF_WARN);
  51         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created");
  52 }
  53
  54 static int qstat_show(struct seq_file *m, void *v)
  55 {
  56         unsigned char state;
  57         struct qdio_q *q = m->private;
  58         int i;
  59
  60         if (!q)
  61                 return 0;
  62
  63         seq_printf(m, "device state indicator: %d\n", *q->irq_ptr->dsci);
  64         seq_printf(m, "nr_used: %d\n", atomic_read(&q->nr_buf_used));
  65         seq_printf(m, "ftc: %d\n", q->first_to_check);
  66         seq_printf(m, "last_move_ftc: %d\n", q->last_move_ftc);
  67         seq_printf(m, "polling: %d\n", q->u.in.polling);
  68         seq_printf(m, "slsb buffer states:\n");
  69
  70         qdio_siga_sync_q(q);
  71         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
  72                 get_buf_state(q, i, &state);
  73                 switch (state) {
  74                 case SLSB_P_INPUT_NOT_INIT:
  75                 case SLSB_P_OUTPUT_NOT_INIT:
  76                         seq_printf(m, "N");
  77                         break;
  78                 case SLSB_P_INPUT_PRIMED:
  79                 case SLSB_CU_OUTPUT_PRIMED:
  80                         seq_printf(m, "+");
  81                         break;
  82                 case SLSB_P_INPUT_ACK:
  83                         seq_printf(m, "A");
  84                         break;
  85                 case SLSB_P_INPUT_ERROR:
  86                 case SLSB_P_OUTPUT_ERROR:
  87                         seq_printf(m, "x");
  88                         break;
  89                 case SLSB_CU_INPUT_EMPTY:
  90                 case SLSB_P_OUTPUT_EMPTY:
  91                         seq_printf(m, "-");
  92                         break;
  93                 case SLSB_P_INPUT_HALTED:
  94                 case SLSB_P_OUTPUT_HALTED:
  95                         seq_printf(m, ".");
  96                         break;
  97                 default:
  98                         seq_printf(m, "?");
  99                 }
 100                 if (i == 63)
 101                         seq_printf(m, "\n");
 102         }
 103         seq_printf(m, "\n");
 104         return 0;
 105 }
 106
 107 static ssize_t qstat_seq_write(struct file *file, const char __user *buf,
 108                                size_t count, loff_t *off)
 109 {
 110         struct seq_file *seq = file->private_data;
 111         struct qdio_q *q = seq->private;
 112
 113         if (!q)
 114                 return 0;
 115
 116         if (q->is_input_q)
 117                 xchg(q->irq_ptr->dsci, 1);
 118         local_bh_disable();
 119         tasklet_schedule(&q->tasklet);
 120         local_bh_enable();
 121         return count;
 122 }
 123
 124 static int qstat_seq_open(struct inode *inode, struct file *filp)
 125 {
 126         return single_open(filp, qstat_show,
 127                            filp->f_path.dentry->d_inode->i_private);
 128 }
 129
 130 static void remove_debugfs_entry(struct qdio_q *q)
 131 {
 132         int i;
 133
 134         for (i = 0; i < MAX_DEBUGFS_QUEUES; i++) {
 135                 if (!debugfs_queues[i])
 136                         continue;
 137                 if (debugfs_queues[i]->d_inode->i_private == q) {
 138                         debugfs_remove(debugfs_queues[i]);
 139                         debugfs_queues[i] = NULL;
 140                 }
 141         }
 142 }
 143
 144 static struct file_operations debugfs_fops = {
 145         .owner   = THIS_MODULE,
 146         .open    = qstat_seq_open,
 147         .read    = seq_read,
 148         .write   = qstat_seq_write,
 149         .llseek  = seq_lseek,
 150         .release = single_release,
 151 };
 152
 153 static void setup_debugfs_entry(struct qdio_q *q, struct ccw_device *cdev)
 154 {
 155         int i = 0;
 156         char name[QDIO_DEBUGFS_NAME_LEN];
 157
 158         while (debugfs_queues[i] != NULL) {
 159                 i++;
 160                 if (i >= MAX_DEBUGFS_QUEUES)
 161                         return;
 162         }
 163         snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%s_%d",
 164                  dev_name(&cdev->dev),
 165                  q->is_input_q ? "input" : "output",
 166                  q->nr);
 167         debugfs_queues[i] = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR,
 168                                                 debugfs_root, q, &debugfs_fops);
 169 }
 170
 171 void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 172 {
 173         struct qdio_q *q;
 174         int i;
 175
 176         mutex_lock(&debugfs_mutex);
 177         for_each_input_queue(irq_ptr, q, i)
 178                 setup_debugfs_entry(q, cdev);
 179         for_each_output_queue(irq_ptr, q, i)
 180                 setup_debugfs_entry(q, cdev);
 181         mutex_unlock(&debugfs_mutex);
 182 }
 183
 184 void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 185 {
 186         struct qdio_q *q;
 187         int i;
 188
 189         mutex_lock(&debugfs_mutex);
 190         for_each_input_queue(irq_ptr, q, i)
 191                 remove_debugfs_entry(q);
 192         for_each_output_queue(irq_ptr, q, i)
 193                 remove_debugfs_entry(q);
 194         mutex_unlock(&debugfs_mutex);
 195 }
 196
 197 int __init qdio_debug_init(void)
 198 {
 199         debugfs_root = debugfs_create_dir("qdio_queues", NULL);
 200
 201         qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
 202         debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
 203         debug_set_level(qdio_dbf_setup, DBF_INFO);
 204         DBF_EVENT("dbf created\n");
 205
 206         qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
 207         debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
 208         debug_set_level(qdio_dbf_error, DBF_INFO);
 209         DBF_ERROR("dbf created\n");
 210         return 0;
 211 }
 212
 213 void qdio_debug_exit(void)
 214 {
 215         debugfs_remove(debugfs_root);
 216         if (qdio_dbf_setup)
 217                 debug_unregister(qdio_dbf_setup);
 218         if (qdio_dbf_error)
 219                 debug_unregister(qdio_dbf_error);
 220 }