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 }