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