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                         int flush_cbrs)
  49 {
  50         void *cb, *cbe, *tfh, *gseg;
  51         int i, scr;
  52
  53         gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
  54         cb = gseg + GRU_CB_BASE;
  55         cbe = grubase + GRU_CBE_BASE;
  56         tfh = grubase + GRU_TFH_BASE;
  57
  58         for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) {
  59                 if (flush_cbrs)
  60                         gru_flush_cache(cb);
  61                 if (gru_user_copy_handle(&ubuf, cb))
  62                         goto fail;
  63                 if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE))
  64                         goto fail;
  65                 if (gru_user_copy_handle(&ubuf, cbe + i * GRU_HANDLE_STRIDE))
  66                         goto fail;
  67                 cb += GRU_HANDLE_STRIDE;
  68         }
  69         if (dsrcnt)
  70                 memcpy(ubuf, gseg + GRU_DS_BASE, dsrcnt * GRU_HANDLE_STRIDE);
  71         return 0;
  72
  73 fail:
  74         return -EFAULT;
  75 }
  76
  77 static int gru_dump_tfm(struct gru_state *gru,
  78                 void __user *ubuf, void __user *ubufend)
  79 {
  80         struct gru_tlb_fault_map *tfm;
  81         int i, ret, bytes;
  82
  83         bytes = GRU_NUM_TFM * GRU_CACHE_LINE_BYTES;
  84         if (bytes > ubufend - ubuf)
  85                 ret = -EFBIG;
  86
  87         for (i = 0; i < GRU_NUM_TFM; i++) {
  88                 tfm = get_tfm(gru->gs_gru_base_vaddr, i);
  89                 if (gru_user_copy_handle(&ubuf, tfm))
  90                         goto fail;
  91         }
  92         return GRU_NUM_TFM * GRU_CACHE_LINE_BYTES;
  93
  94 fail:
  95         return -EFAULT;
  96 }
  97
  98 static int gru_dump_tgh(struct gru_state *gru,
  99                 void __user *ubuf, void __user *ubufend)
 100 {
 101         struct gru_tlb_global_handle *tgh;
 102         int i, ret, bytes;
 103
 104         bytes = GRU_NUM_TGH * GRU_CACHE_LINE_BYTES;
 105         if (bytes > ubufend - ubuf)
 106                 ret = -EFBIG;
 107
 108         for (i = 0; i < GRU_NUM_TGH; i++) {
 109                 tgh = get_tgh(gru->gs_gru_base_vaddr, i);
 110                 if (gru_user_copy_handle(&ubuf, tgh))
 111                         goto fail;
 112         }
 113         return GRU_NUM_TGH * GRU_CACHE_LINE_BYTES;
 114
 115 fail:
 116         return -EFAULT;
 117 }
 118
 119 static int gru_dump_context(struct gru_state *gru, int ctxnum,
 120                 void __user *ubuf, void __user *ubufend, char data_opt,
 121                 char lock_cch, char flush_cbrs)
 122 {
 123         struct gru_dump_context_header hdr;
 124         struct gru_dump_context_header __user *uhdr = ubuf;
 125         struct gru_context_configuration_handle *cch, *ubufcch;
 126         struct gru_thread_state *gts;
 127         int try, cch_locked, cbrcnt = 0, dsrcnt = 0, bytes = 0, ret = 0;
 128         void *grubase;
 129
 130         memset(&hdr, 0, sizeof(hdr));
 131         grubase = gru->gs_gru_base_vaddr;
 132         cch = get_cch(grubase, ctxnum);
 133         for (try = 0; try < CCH_LOCK_ATTEMPTS; try++) {
 134                 cch_locked =  trylock_cch_handle(cch);
 135                 if (cch_locked)
 136                         break;
 137                 msleep(1);
 138         }
 139
 140         ubuf += sizeof(hdr);
 141         ubufcch = ubuf;
 142         if (gru_user_copy_handle(&ubuf, cch)) {
 143                 if (cch_locked)
 144                         unlock_cch_handle(cch);
 145                 return -EFAULT;
 146         }
 147         if (cch_locked)
 148                 ubufcch->delresp = 0;
 149         bytes = sizeof(hdr) + GRU_CACHE_LINE_BYTES;
 150
 151         if (cch_locked || !lock_cch) {
 152                 gts = gru->gs_gts[ctxnum];
 153                 if (gts && gts->ts_vma) {
 154                         hdr.pid = gts->ts_tgid_owner;
 155                         hdr.vaddr = gts->ts_vma->vm_start;
 156                 }
 157                 if (cch->state != CCHSTATE_INACTIVE) {
 158                         cbrcnt = hweight64(cch->cbr_allocation_map) *
 159                                                 GRU_CBR_AU_SIZE;
 160                         dsrcnt = data_opt ? hweight32(cch->dsr_allocation_map) *
 161                                                 GRU_DSR_AU_CL : 0;
 162                 }
 163                 bytes += (3 * cbrcnt + dsrcnt) * GRU_CACHE_LINE_BYTES;
 164                 if (bytes > ubufend - ubuf)
 165                         ret = -EFBIG;
 166                 else
 167                         ret = gru_dump_context_data(grubase, cch, ubuf, ctxnum,
 168                                                         dsrcnt, flush_cbrs);
 169         }
 170         if (cch_locked)
 171                 unlock_cch_handle(cch);
 172         if (ret)
 173                 return ret;
 174
 175         hdr.magic = GRU_DUMP_MAGIC;
 176         hdr.gid = gru->gs_gid;
 177         hdr.ctxnum = ctxnum;
 178         hdr.cbrcnt = cbrcnt;
 179         hdr.dsrcnt = dsrcnt;
 180         hdr.cch_locked = cch_locked;
 181         if (copy_to_user(uhdr, &hdr, sizeof(hdr)))
 182                 return -EFAULT;
 183
 184         return bytes;
 185 }
 186
 187 int gru_dump_chiplet_request(unsigned long arg)
 188 {
 189         struct gru_state *gru;
 190         struct gru_dump_chiplet_state_req req;
 191         void __user *ubuf;
 192         void __user *ubufend;
 193         int ctxnum, ret, cnt = 0;
 194
 195         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
 196                 return -EFAULT;
 197
 198         /* Currently, only dump by gid is implemented */
 199         if (req.gid >= gru_max_gids || req.gid < 0)
 200                 return -EINVAL;
 201
 202         gru = GID_TO_GRU(req.gid);
 203         ubuf = req.buf;
 204         ubufend = req.buf + req.buflen;
 205
 206         ret = gru_dump_tfm(gru, ubuf, ubufend);
 207         if (ret < 0)
 208                 goto fail;
 209         ubuf += ret;
 210
 211         ret = gru_dump_tgh(gru, ubuf, ubufend);
 212         if (ret < 0)
 213                 goto fail;
 214         ubuf += ret;
 215
 216         for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
 217                 if (req.ctxnum == ctxnum || req.ctxnum < 0) {
 218                         ret = gru_dump_context(gru, ctxnum, ubuf, ubufend,
 219                                                 req.data_opt, req.lock_cch,
 220                                                 req.flush_cbrs);
 221                         if (ret < 0)
 222                                 goto fail;
 223                         ubuf += ret;
 224                         cnt++;
 225                 }
 226         }
 227
 228         if (copy_to_user((void __user *)arg, &req, sizeof(req)))
 229                 return -EFAULT;
 230         return cnt;
 231
 232 fail:
 233         return ret;
 234 }