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1 /*
2  * SN Platform GRU Driver
3  *
4  *              PROC INTERFACES
5  *
6  * This file supports the /proc interfaces for the GRU driver
7  *
8  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or
13  *  (at your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful,
16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *  GNU General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License
21  *  along with this program; if not, write to the Free Software
22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23  */
24 
25 #include <linux/proc_fs.h>
26 #include <linux/device.h>
27 #include <linux/seq_file.h>
28 #include <linux/uaccess.h>
29 #include "gru.h"
30 #include "grulib.h"
31 #include "grutables.h"
32 
33 #define printstat(s, f)		printstat_val(s, &gru_stats.f, #f)
34 
printstat_val(struct seq_file * s,atomic_long_t * v,char * id)35 static void printstat_val(struct seq_file *s, atomic_long_t *v, char *id)
36 {
37 	unsigned long val = atomic_long_read(v);
38 
39 	if (val)
40 		seq_printf(s, "%16lu %s\n", val, id);
41 }
42 
statistics_show(struct seq_file * s,void * p)43 static int statistics_show(struct seq_file *s, void *p)
44 {
45 	printstat(s, vdata_alloc);
46 	printstat(s, vdata_free);
47 	printstat(s, gts_alloc);
48 	printstat(s, gts_free);
49 	printstat(s, vdata_double_alloc);
50 	printstat(s, gts_double_allocate);
51 	printstat(s, assign_context);
52 	printstat(s, assign_context_failed);
53 	printstat(s, free_context);
54 	printstat(s, load_context);
55 	printstat(s, unload_context);
56 	printstat(s, steal_context);
57 	printstat(s, steal_context_failed);
58 	printstat(s, nopfn);
59 	printstat(s, break_cow);
60 	printstat(s, asid_new);
61 	printstat(s, asid_next);
62 	printstat(s, asid_wrap);
63 	printstat(s, asid_reuse);
64 	printstat(s, intr);
65 	printstat(s, call_os);
66 	printstat(s, call_os_check_for_bug);
67 	printstat(s, call_os_wait_queue);
68 	printstat(s, user_flush_tlb);
69 	printstat(s, user_unload_context);
70 	printstat(s, user_exception);
71 	printstat(s, set_task_slice);
72 	printstat(s, migrate_check);
73 	printstat(s, migrated_retarget);
74 	printstat(s, migrated_unload);
75 	printstat(s, migrated_unload_delay);
76 	printstat(s, migrated_nopfn_retarget);
77 	printstat(s, migrated_nopfn_unload);
78 	printstat(s, tlb_dropin);
79 	printstat(s, tlb_dropin_fail_no_asid);
80 	printstat(s, tlb_dropin_fail_upm);
81 	printstat(s, tlb_dropin_fail_invalid);
82 	printstat(s, tlb_dropin_fail_range_active);
83 	printstat(s, tlb_dropin_fail_idle);
84 	printstat(s, tlb_dropin_fail_fmm);
85 	printstat(s, mmu_invalidate_range);
86 	printstat(s, mmu_invalidate_page);
87 	printstat(s, mmu_clear_flush_young);
88 	printstat(s, flush_tlb);
89 	printstat(s, flush_tlb_gru);
90 	printstat(s, flush_tlb_gru_tgh);
91 	printstat(s, flush_tlb_gru_zero_asid);
92 	printstat(s, copy_gpa);
93 	printstat(s, mesq_receive);
94 	printstat(s, mesq_receive_none);
95 	printstat(s, mesq_send);
96 	printstat(s, mesq_send_failed);
97 	printstat(s, mesq_noop);
98 	printstat(s, mesq_send_unexpected_error);
99 	printstat(s, mesq_send_lb_overflow);
100 	printstat(s, mesq_send_qlimit_reached);
101 	printstat(s, mesq_send_amo_nacked);
102 	printstat(s, mesq_send_put_nacked);
103 	printstat(s, mesq_qf_not_full);
104 	printstat(s, mesq_qf_locked);
105 	printstat(s, mesq_qf_noop_not_full);
106 	printstat(s, mesq_qf_switch_head_failed);
107 	printstat(s, mesq_qf_unexpected_error);
108 	printstat(s, mesq_noop_unexpected_error);
109 	printstat(s, mesq_noop_lb_overflow);
110 	printstat(s, mesq_noop_qlimit_reached);
111 	printstat(s, mesq_noop_amo_nacked);
112 	printstat(s, mesq_noop_put_nacked);
113 	return 0;
114 }
115 
statistics_write(struct file * file,const char __user * userbuf,size_t count,loff_t * data)116 static ssize_t statistics_write(struct file *file, const char __user *userbuf,
117 				size_t count, loff_t *data)
118 {
119 	memset(&gru_stats, 0, sizeof(gru_stats));
120 	return count;
121 }
122 
options_show(struct seq_file * s,void * p)123 static int options_show(struct seq_file *s, void *p)
124 {
125 	seq_printf(s, "0x%lx\n", gru_options);
126 	return 0;
127 }
128 
options_write(struct file * file,const char __user * userbuf,size_t count,loff_t * data)129 static ssize_t options_write(struct file *file, const char __user *userbuf,
130 			     size_t count, loff_t *data)
131 {
132 	unsigned long val;
133 	char buf[80];
134 
135 	if (copy_from_user
136 	    (buf, userbuf, count < sizeof(buf) ? count : sizeof(buf)))
137 		return -EFAULT;
138 	if (!strict_strtoul(buf, 10, &val))
139 		gru_options = val;
140 
141 	return count;
142 }
143 
cch_seq_show(struct seq_file * file,void * data)144 static int cch_seq_show(struct seq_file *file, void *data)
145 {
146 	long gid = *(long *)data;
147 	int i;
148 	struct gru_state *gru = GID_TO_GRU(gid);
149 	struct gru_thread_state *ts;
150 	const char *mode[] = { "??", "UPM", "INTR", "OS_POLL" };
151 
152 	if (gid == 0)
153 		seq_printf(file, "#%5s%5s%6s%9s%6s%8s%8s\n", "gid", "bid",
154 			   "ctx#", "pid", "cbrs", "dsbytes", "mode");
155 	if (gru)
156 		for (i = 0; i < GRU_NUM_CCH; i++) {
157 			ts = gru->gs_gts[i];
158 			if (!ts)
159 				continue;
160 			seq_printf(file, " %5d%5d%6d%9d%6d%8d%8s\n",
161 				   gru->gs_gid, gru->gs_blade_id, i,
162 				   ts->ts_tgid_owner,
163 				   ts->ts_cbr_au_count * GRU_CBR_AU_SIZE,
164 				   ts->ts_cbr_au_count * GRU_DSR_AU_BYTES,
165 				   mode[ts->ts_user_options &
166 					GRU_OPT_MISS_MASK]);
167 		}
168 
169 	return 0;
170 }
171 
gru_seq_show(struct seq_file * file,void * data)172 static int gru_seq_show(struct seq_file *file, void *data)
173 {
174 	long gid = *(long *)data, ctxfree, cbrfree, dsrfree;
175 	struct gru_state *gru = GID_TO_GRU(gid);
176 
177 	if (gid == 0) {
178 		seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "gid", "nid",
179 			   "ctx", "cbr", "dsr", "ctx", "cbr", "dsr");
180 		seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "", "", "busy",
181 			   "busy", "busy", "free", "free", "free");
182 	}
183 	if (gru) {
184 		ctxfree = GRU_NUM_CCH - gru->gs_active_contexts;
185 		cbrfree = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
186 		dsrfree = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
187 		seq_printf(file, " %5d%5d%7ld%6ld%6ld%8ld%6ld%6ld\n",
188 			   gru->gs_gid, gru->gs_blade_id, GRU_NUM_CCH - ctxfree,
189 			   GRU_NUM_CBE - cbrfree, GRU_NUM_DSR_BYTES - dsrfree,
190 			   ctxfree, cbrfree, dsrfree);
191 	}
192 
193 	return 0;
194 }
195 
seq_stop(struct seq_file * file,void * data)196 static void seq_stop(struct seq_file *file, void *data)
197 {
198 }
199 
seq_start(struct seq_file * file,loff_t * gid)200 static void *seq_start(struct seq_file *file, loff_t *gid)
201 {
202 	if (*gid < GRU_MAX_GRUS)
203 		return gid;
204 	return NULL;
205 }
206 
seq_next(struct seq_file * file,void * data,loff_t * gid)207 static void *seq_next(struct seq_file *file, void *data, loff_t *gid)
208 {
209 	(*gid)++;
210 	if (*gid < GRU_MAX_GRUS)
211 		return gid;
212 	return NULL;
213 }
214 
215 static const struct seq_operations cch_seq_ops = {
216 	.start	= seq_start,
217 	.next	= seq_next,
218 	.stop	= seq_stop,
219 	.show	= cch_seq_show
220 };
221 
222 static const struct seq_operations gru_seq_ops = {
223 	.start	= seq_start,
224 	.next	= seq_next,
225 	.stop	= seq_stop,
226 	.show	= gru_seq_show
227 };
228 
statistics_open(struct inode * inode,struct file * file)229 static int statistics_open(struct inode *inode, struct file *file)
230 {
231 	return single_open(file, statistics_show, NULL);
232 }
233 
options_open(struct inode * inode,struct file * file)234 static int options_open(struct inode *inode, struct file *file)
235 {
236 	return single_open(file, options_show, NULL);
237 }
238 
cch_open(struct inode * inode,struct file * file)239 static int cch_open(struct inode *inode, struct file *file)
240 {
241 	return seq_open(file, &cch_seq_ops);
242 }
243 
gru_open(struct inode * inode,struct file * file)244 static int gru_open(struct inode *inode, struct file *file)
245 {
246 	return seq_open(file, &gru_seq_ops);
247 }
248 
249 /* *INDENT-OFF* */
250 static const struct file_operations statistics_fops = {
251 	.open 		= statistics_open,
252 	.read 		= seq_read,
253 	.write 		= statistics_write,
254 	.llseek 	= seq_lseek,
255 	.release 	= single_release,
256 };
257 
258 static const struct file_operations options_fops = {
259 	.open 		= options_open,
260 	.read 		= seq_read,
261 	.write 		= options_write,
262 	.llseek 	= seq_lseek,
263 	.release 	= single_release,
264 };
265 
266 static const struct file_operations cch_fops = {
267 	.open 		= cch_open,
268 	.read 		= seq_read,
269 	.llseek 	= seq_lseek,
270 	.release 	= seq_release,
271 };
272 static const struct file_operations gru_fops = {
273 	.open 		= gru_open,
274 	.read 		= seq_read,
275 	.llseek 	= seq_lseek,
276 	.release 	= seq_release,
277 };
278 
279 static struct proc_entry {
280 	char *name;
281 	int mode;
282 	const struct file_operations *fops;
283 	struct proc_dir_entry *entry;
284 } proc_files[] = {
285 	{"statistics", 0644, &statistics_fops},
286 	{"debug_options", 0644, &options_fops},
287 	{"cch_status", 0444, &cch_fops},
288 	{"gru_status", 0444, &gru_fops},
289 	{NULL}
290 };
291 /* *INDENT-ON* */
292 
293 static struct proc_dir_entry *proc_gru __read_mostly;
294 
create_proc_file(struct proc_entry * p)295 static int create_proc_file(struct proc_entry *p)
296 {
297 	p->entry = create_proc_entry(p->name, p->mode, proc_gru);
298 	if (!p->entry)
299 		return -1;
300 	p->entry->proc_fops = p->fops;
301 	return 0;
302 }
303 
delete_proc_files(void)304 static void delete_proc_files(void)
305 {
306 	struct proc_entry *p;
307 
308 	if (proc_gru) {
309 		for (p = proc_files; p->name; p++)
310 			if (p->entry)
311 				remove_proc_entry(p->name, proc_gru);
312 		remove_proc_entry("gru", NULL);
313 	}
314 }
315 
gru_proc_init(void)316 int gru_proc_init(void)
317 {
318 	struct proc_entry *p;
319 
320 	proc_gru = proc_mkdir("sgi_uv/gru", NULL);
321 
322 	for (p = proc_files; p->name; p++)
323 		if (create_proc_file(p))
324 			goto err;
325 	return 0;
326 
327 err:
328 	delete_proc_files();
329 	return -1;
330 }
331 
gru_proc_exit(void)332 void gru_proc_exit(void)
333 {
334 	delete_proc_files();
335 }
336