Merge branch 'sched/latest' of git://git.kernel.org/pub/scm/linux/kernel/git/ghaskins...
[linux-2.6] / 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", *(u32 *)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, "ack count: %d\n", q->u.in.ack_count);
69         seq_printf(m, "slsb buffer states:\n");
70         seq_printf(m, "|0      |8      |16     |24     |32     |40     |48     |56  63|\n");
71
72         qdio_siga_sync_q(q);
73         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
74                 get_buf_state(q, i, &state, 0);
75                 switch (state) {
76                 case SLSB_P_INPUT_NOT_INIT:
77                 case SLSB_P_OUTPUT_NOT_INIT:
78                         seq_printf(m, "N");
79                         break;
80                 case SLSB_P_INPUT_PRIMED:
81                 case SLSB_CU_OUTPUT_PRIMED:
82                         seq_printf(m, "+");
83                         break;
84                 case SLSB_P_INPUT_ACK:
85                         seq_printf(m, "A");
86                         break;
87                 case SLSB_P_INPUT_ERROR:
88                 case SLSB_P_OUTPUT_ERROR:
89                         seq_printf(m, "x");
90                         break;
91                 case SLSB_CU_INPUT_EMPTY:
92                 case SLSB_P_OUTPUT_EMPTY:
93                         seq_printf(m, "-");
94                         break;
95                 case SLSB_P_INPUT_HALTED:
96                 case SLSB_P_OUTPUT_HALTED:
97                         seq_printf(m, ".");
98                         break;
99                 default:
100                         seq_printf(m, "?");
101                 }
102                 if (i == 63)
103                         seq_printf(m, "\n");
104         }
105         seq_printf(m, "\n");
106         seq_printf(m, "|64     |72     |80     |88     |96     |104    |112    |   127|\n");
107         return 0;
108 }
109
110 static ssize_t qstat_seq_write(struct file *file, const char __user *buf,
111                                size_t count, loff_t *off)
112 {
113         struct seq_file *seq = file->private_data;
114         struct qdio_q *q = seq->private;
115
116         if (!q)
117                 return 0;
118
119         if (q->is_input_q)
120                 xchg(q->irq_ptr->dsci, 1);
121         local_bh_disable();
122         tasklet_schedule(&q->tasklet);
123         local_bh_enable();
124         return count;
125 }
126
127 static int qstat_seq_open(struct inode *inode, struct file *filp)
128 {
129         return single_open(filp, qstat_show,
130                            filp->f_path.dentry->d_inode->i_private);
131 }
132
133 static void remove_debugfs_entry(struct qdio_q *q)
134 {
135         int i;
136
137         for (i = 0; i < MAX_DEBUGFS_QUEUES; i++) {
138                 if (!debugfs_queues[i])
139                         continue;
140                 if (debugfs_queues[i]->d_inode->i_private == q) {
141                         debugfs_remove(debugfs_queues[i]);
142                         debugfs_queues[i] = NULL;
143                 }
144         }
145 }
146
147 static struct file_operations debugfs_fops = {
148         .owner   = THIS_MODULE,
149         .open    = qstat_seq_open,
150         .read    = seq_read,
151         .write   = qstat_seq_write,
152         .llseek  = seq_lseek,
153         .release = single_release,
154 };
155
156 static void setup_debugfs_entry(struct qdio_q *q, struct ccw_device *cdev)
157 {
158         int i = 0;
159         char name[QDIO_DEBUGFS_NAME_LEN];
160
161         while (debugfs_queues[i] != NULL) {
162                 i++;
163                 if (i >= MAX_DEBUGFS_QUEUES)
164                         return;
165         }
166         snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%s_%d",
167                  dev_name(&cdev->dev),
168                  q->is_input_q ? "input" : "output",
169                  q->nr);
170         debugfs_queues[i] = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR,
171                                                 debugfs_root, q, &debugfs_fops);
172         if (IS_ERR(debugfs_queues[i]))
173                 debugfs_queues[i] = NULL;
174 }
175
176 void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
177 {
178         struct qdio_q *q;
179         int i;
180
181         mutex_lock(&debugfs_mutex);
182         for_each_input_queue(irq_ptr, q, i)
183                 setup_debugfs_entry(q, cdev);
184         for_each_output_queue(irq_ptr, q, i)
185                 setup_debugfs_entry(q, cdev);
186         mutex_unlock(&debugfs_mutex);
187 }
188
189 void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
190 {
191         struct qdio_q *q;
192         int i;
193
194         mutex_lock(&debugfs_mutex);
195         for_each_input_queue(irq_ptr, q, i)
196                 remove_debugfs_entry(q);
197         for_each_output_queue(irq_ptr, q, i)
198                 remove_debugfs_entry(q);
199         mutex_unlock(&debugfs_mutex);
200 }
201
202 int __init qdio_debug_init(void)
203 {
204         debugfs_root = debugfs_create_dir("qdio_queues", NULL);
205
206         qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
207         debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
208         debug_set_level(qdio_dbf_setup, DBF_INFO);
209         DBF_EVENT("dbf created\n");
210
211         qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
212         debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
213         debug_set_level(qdio_dbf_error, DBF_INFO);
214         DBF_ERROR("dbf created\n");
215         return 0;
216 }
217
218 void qdio_debug_exit(void)
219 {
220         debugfs_remove(debugfs_root);
221         if (qdio_dbf_setup)
222                 debug_unregister(qdio_dbf_setup);
223         if (qdio_dbf_error)
224                 debug_unregister(qdio_dbf_error);
225 }