b5390821434f066376b35f7a749cf1331eff8a18
[linux-2.6.git] / 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 }