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