gru: copyright fixes
[linux-2.6.git] / drivers / misc / sgi-gru / grukdump.c
1 /*
2  * SN Platform GRU Driver
3  *
4  *            Dump GRU State
5  *
6  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
21  */
22
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/spinlock.h>
26 #include <linux/uaccess.h>
27 #include <linux/delay.h>
28 #include <linux/bitops.h>
29 #include <asm/uv/uv_hub.h>
30 #include "gru.h"
31 #include "grutables.h"
32 #include "gruhandles.h"
33 #include "grulib.h"
34
35 #define CCH_LOCK_ATTEMPTS       10
36
37 static int gru_user_copy_handle(void __user **dp, void *s)
38 {
39         if (copy_to_user(*dp, s, GRU_HANDLE_BYTES))
40                 return -1;
41         *dp += GRU_HANDLE_BYTES;
42         return 0;
43 }
44
45 static int gru_dump_context_data(void *grubase,
46                         struct gru_context_configuration_handle *cch,
47                         void __user *ubuf, int ctxnum, int dsrcnt)
48 {
49         void *cb, *cbe, *tfh, *gseg;
50         int i, scr;
51
52         gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
53         cb = gseg + GRU_CB_BASE;
54         cbe = grubase + GRU_CBE_BASE;
55         tfh = grubase + GRU_TFH_BASE;
56
57         for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) {
58                 if (gru_user_copy_handle(&ubuf, cb))
59                         goto fail;
60                 if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE))
61                         goto fail;
62                 if (gru_user_copy_handle(&ubuf, cbe + i * GRU_HANDLE_STRIDE))
63                         goto fail;
64                 cb += GRU_HANDLE_STRIDE;
65         }
66         if (dsrcnt)
67                 memcpy(ubuf, gseg + GRU_DS_BASE, dsrcnt * GRU_HANDLE_STRIDE);
68         return 0;
69
70 fail:
71         return -EFAULT;
72 }
73
74 static int gru_dump_tfm(struct gru_state *gru,
75                 void __user *ubuf, void __user *ubufend)
76 {
77         struct gru_tlb_fault_map *tfm;
78         int i, ret, bytes;
79
80         bytes = GRU_NUM_TFM * GRU_CACHE_LINE_BYTES;
81         if (bytes > ubufend - ubuf)
82                 ret = -EFBIG;
83
84         for (i = 0; i < GRU_NUM_TFM; i++) {
85                 tfm = get_tfm(gru->gs_gru_base_vaddr, i);
86                 if (gru_user_copy_handle(&ubuf, tfm))
87                         goto fail;
88         }
89         return GRU_NUM_TFM * GRU_CACHE_LINE_BYTES;
90
91 fail:
92         return -EFAULT;
93 }
94
95 static int gru_dump_tgh(struct gru_state *gru,
96                 void __user *ubuf, void __user *ubufend)
97 {
98         struct gru_tlb_global_handle *tgh;
99         int i, ret, bytes;
100
101         bytes = GRU_NUM_TGH * GRU_CACHE_LINE_BYTES;
102         if (bytes > ubufend - ubuf)
103                 ret = -EFBIG;
104
105         for (i = 0; i < GRU_NUM_TGH; i++) {
106                 tgh = get_tgh(gru->gs_gru_base_vaddr, i);
107                 if (gru_user_copy_handle(&ubuf, tgh))
108                         goto fail;
109         }
110         return GRU_NUM_TGH * GRU_CACHE_LINE_BYTES;
111
112 fail:
113         return -EFAULT;
114 }
115
116 static int gru_dump_context(struct gru_state *gru, int ctxnum,
117                 void __user *ubuf, void __user *ubufend, char data_opt,
118                 char lock_cch)
119 {
120         struct gru_dump_context_header hdr;
121         struct gru_dump_context_header __user *uhdr = ubuf;
122         struct gru_context_configuration_handle *cch, *ubufcch;
123         struct gru_thread_state *gts;
124         int try, cch_locked, cbrcnt = 0, dsrcnt = 0, bytes = 0, ret = 0;
125         void *grubase;
126
127         memset(&hdr, 0, sizeof(hdr));
128         grubase = gru->gs_gru_base_vaddr;
129         cch = get_cch(grubase, ctxnum);
130         for (try = 0; try < CCH_LOCK_ATTEMPTS; try++) {
131                 cch_locked =  trylock_cch_handle(cch);
132                 if (cch_locked)
133                         break;
134                 msleep(1);
135         }
136
137         ubuf += sizeof(hdr);
138         ubufcch = ubuf;
139         if (gru_user_copy_handle(&ubuf, cch))
140                 goto fail;
141         if (cch_locked)
142                 ubufcch->delresp = 0;
143         bytes = sizeof(hdr) + GRU_CACHE_LINE_BYTES;
144
145         if (cch_locked || !lock_cch) {
146                 gts = gru->gs_gts[ctxnum];
147                 if (gts && gts->ts_vma) {
148                         hdr.pid = gts->ts_tgid_owner;
149                         hdr.vaddr = gts->ts_vma->vm_start;
150                 }
151                 if (cch->state != CCHSTATE_INACTIVE) {
152                         cbrcnt = hweight64(cch->cbr_allocation_map) *
153                                                 GRU_CBR_AU_SIZE;
154                         dsrcnt = data_opt ? hweight32(cch->dsr_allocation_map) *
155                                                 GRU_DSR_AU_CL : 0;
156                 }
157                 bytes += (3 * cbrcnt + dsrcnt) * GRU_CACHE_LINE_BYTES;
158                 if (bytes > ubufend - ubuf)
159                         ret = -EFBIG;
160                 else
161                         ret = gru_dump_context_data(grubase, cch, ubuf, ctxnum,
162                                                         dsrcnt);
163
164         }
165         if (cch_locked)
166                 unlock_cch_handle(cch);
167         if (ret)
168                 return ret;
169
170         hdr.magic = GRU_DUMP_MAGIC;
171         hdr.gid = gru->gs_gid;
172         hdr.ctxnum = ctxnum;
173         hdr.cbrcnt = cbrcnt;
174         hdr.dsrcnt = dsrcnt;
175         hdr.cch_locked = cch_locked;
176         if (!ret && copy_to_user((void __user *)uhdr, &hdr, sizeof(hdr)))
177                 ret = -EFAULT;
178
179         return ret ? ret : bytes;
180
181 fail:
182         unlock_cch_handle(cch);
183         return -EFAULT;
184 }
185
186 int gru_dump_chiplet_request(unsigned long arg)
187 {
188         struct gru_state *gru;
189         struct gru_dump_chiplet_state_req req;
190         void __user *ubuf;
191         void __user *ubufend;
192         int ctxnum, ret, cnt = 0;
193
194         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
195                 return -EFAULT;
196
197         /* Currently, only dump by gid is implemented */
198         if (req.gid >= gru_max_gids || req.gid < 0)
199                 return -EINVAL;
200
201         gru = GID_TO_GRU(req.gid);
202         ubuf = req.buf;
203         ubufend = req.buf + req.buflen;
204
205         ret = gru_dump_tfm(gru, ubuf, ubufend);
206         if (ret < 0)
207                 goto fail;
208         ubuf += ret;
209
210         ret = gru_dump_tgh(gru, ubuf, ubufend);
211         if (ret < 0)
212                 goto fail;
213         ubuf += ret;
214
215         for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
216                 if (req.ctxnum == ctxnum || req.ctxnum < 0) {
217                         ret = gru_dump_context(gru, ctxnum, ubuf, ubufend,
218                                                 req.data_opt, req.lock_cch);
219                         if (ret < 0)
220                                 goto fail;
221                         ubuf += ret;
222                         cnt++;
223                 }
224         }
225
226         if (copy_to_user((void __user *)arg, &req, sizeof(req)))
227                 return -EFAULT;
228         return cnt;
229
230 fail:
231         return ret;
232 }