drivers/edac/tile_edac.c

   1 /*
   2  * Copyright 2011 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  * Tilera-specific EDAC driver.
  14  *
  15  * This source code is derived from the following driver:
  16  *
  17  * Cell MIC driver for ECC counting
  18  *
  19  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
  20  *                <benh@kernel.crashing.org>
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/io.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/edac.h>
  30 #include <hv/hypervisor.h>
  31 #include <hv/drv_mshim_intf.h>
  32
  33 #include "edac_core.h"
  34
  35 #define DRV_NAME        "tile-edac"
  36
  37 /* Number of cs_rows needed per memory controller on TILEPro. */
  38 #define TILE_EDAC_NR_CSROWS     1
  39
  40 /* Number of channels per memory controller on TILEPro. */
  41 #define TILE_EDAC_NR_CHANS      1
  42
  43 /* Granularity of reported error in bytes on TILEPro. */
  44 #define TILE_EDAC_ERROR_GRAIN   8
  45
  46 /* TILE processor has multiple independent memory controllers. */
  47 struct platform_device *mshim_pdev[TILE_MAX_MSHIMS];
  48
  49 struct tile_edac_priv {
  50         int             hv_devhdl;      /* Hypervisor device handle. */
  51         int             node;           /* Memory controller instance #. */
  52         unsigned int    ce_count;       /*
  53                                          * Correctable-error counter
  54                                          * kept by the driver.
  55                                          */
  56 };
  57
  58 static void tile_edac_check(struct mem_ctl_info *mci)
  59 {
  60         struct tile_edac_priv   *priv = mci->pvt_info;
  61         struct mshim_mem_error  mem_error;
  62
  63         if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_error,
  64                 sizeof(struct mshim_mem_error), MSHIM_MEM_ERROR_OFF) !=
  65                 sizeof(struct mshim_mem_error)) {
  66                 pr_err(DRV_NAME ": MSHIM_MEM_ERROR_OFF pread failure.\n");
  67                 return;
  68         }
  69
  70         /* Check if the current error count is different from the saved one. */
  71         if (mem_error.sbe_count != priv->ce_count) {
  72                 dev_dbg(mci->dev, "ECC CE err on node %d\n", priv->node);
  73                 priv->ce_count = mem_error.sbe_count;
  74                 edac_mc_handle_ce(mci, 0, 0, 0, 0, 0, mci->ctl_name);
  75         }
  76 }
  77
  78 /*
  79  * Initialize the 'csrows' table within the mci control structure with the
  80  * addressing of memory.
  81  */
  82 static int __devinit tile_edac_init_csrows(struct mem_ctl_info *mci)
  83 {
  84         struct csrow_info       *csrow = &mci->csrows[0];
  85         struct tile_edac_priv   *priv = mci->pvt_info;
  86         struct mshim_mem_info   mem_info;
  87
  88         if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info,
  89                 sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) !=
  90                 sizeof(struct mshim_mem_info)) {
  91                 pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n");
  92                 return -1;
  93         }
  94
  95         if (mem_info.mem_ecc)
  96                 csrow->edac_mode = EDAC_SECDED;
  97         else
  98                 csrow->edac_mode = EDAC_NONE;
  99         switch (mem_info.mem_type) {
 100         case DDR2:
 101                 csrow->mtype = MEM_DDR2;
 102                 break;
 103
 104         case DDR3:
 105                 csrow->mtype = MEM_DDR3;
 106                 break;
 107
 108         default:
 109                 return -1;
 110         }
 111
 112         csrow->first_page = 0;
 113         csrow->nr_pages = mem_info.mem_size >> PAGE_SHIFT;
 114         csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 115         csrow->grain = TILE_EDAC_ERROR_GRAIN;
 116         csrow->dtype = DEV_UNKNOWN;
 117
 118         return 0;
 119 }
 120
 121 static int __devinit tile_edac_mc_probe(struct platform_device *pdev)
 122 {
 123         char                    hv_file[32];
 124         int                     hv_devhdl;
 125         struct mem_ctl_info     *mci;
 126         struct tile_edac_priv   *priv;
 127         int                     rc;
 128
 129         sprintf(hv_file, "mshim/%d", pdev->id);
 130         hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0);
 131         if (hv_devhdl < 0)
 132                 return -EINVAL;
 133
 134         /* A TILE MC has a single channel and one chip-select row. */
 135         mci = edac_mc_alloc(sizeof(struct tile_edac_priv),
 136                 TILE_EDAC_NR_CSROWS, TILE_EDAC_NR_CHANS, pdev->id);
 137         if (mci == NULL)
 138                 return -ENOMEM;
 139         priv = mci->pvt_info;
 140         priv->node = pdev->id;
 141         priv->hv_devhdl = hv_devhdl;
 142
 143         mci->dev = &pdev->dev;
 144         mci->mtype_cap = MEM_FLAG_DDR2;
 145         mci->edac_ctl_cap = EDAC_FLAG_SECDED;
 146
 147         mci->mod_name = DRV_NAME;
 148         mci->ctl_name = "TILEPro_Memory_Controller";
 149         mci->dev_name = dev_name(&pdev->dev);
 150         mci->edac_check = tile_edac_check;
 151
 152         /*
 153          * Initialize the MC control structure 'csrows' table
 154          * with the mapping and control information.
 155          */
 156         if (tile_edac_init_csrows(mci)) {
 157                 /* No csrows found. */
 158                 mci->edac_cap = EDAC_FLAG_NONE;
 159         } else {
 160                 mci->edac_cap = EDAC_FLAG_SECDED;
 161         }
 162
 163         platform_set_drvdata(pdev, mci);
 164
 165         /* Register with EDAC core */
 166         rc = edac_mc_add_mc(mci);
 167         if (rc) {
 168                 dev_err(&pdev->dev, "failed to register with EDAC core\n");
 169                 edac_mc_free(mci);
 170                 return rc;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static int __devexit tile_edac_mc_remove(struct platform_device *pdev)
 177 {
 178         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 179
 180         edac_mc_del_mc(&pdev->dev);
 181         if (mci)
 182                 edac_mc_free(mci);
 183         return 0;
 184 }
 185
 186 static struct platform_driver tile_edac_mc_driver = {
 187         .driver         = {
 188                 .name   = DRV_NAME,
 189                 .owner  = THIS_MODULE,
 190         },
 191         .probe          = tile_edac_mc_probe,
 192         .remove         = __devexit_p(tile_edac_mc_remove),
 193 };
 194
 195 /*
 196  * Driver init routine.
 197  */
 198 static int __init tile_edac_init(void)
 199 {
 200         char    hv_file[32];
 201         struct platform_device *pdev;
 202         int i, err, num = 0;
 203
 204         /* Only support POLL mode. */
 205         edac_op_state = EDAC_OPSTATE_POLL;
 206
 207         err = platform_driver_register(&tile_edac_mc_driver);
 208         if (err)
 209                 return err;
 210
 211         for (i = 0; i < TILE_MAX_MSHIMS; i++) {
 212                 /*
 213                  * Not all memory controllers are configured such as in the
 214                  * case of a simulator. So we register only those mshims
 215                  * that are configured by the hypervisor.
 216                  */
 217                 sprintf(hv_file, "mshim/%d", i);
 218                 if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0)
 219                         continue;
 220
 221                 pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0);
 222                 if (IS_ERR(pdev))
 223                         continue;
 224                 mshim_pdev[i] = pdev;
 225                 num++;
 226         }
 227
 228         if (num == 0) {
 229                 platform_driver_unregister(&tile_edac_mc_driver);
 230                 return -ENODEV;
 231         }
 232         return 0;
 233 }
 234
 235 /*
 236  * Driver cleanup routine.
 237  */
 238 static void __exit tile_edac_exit(void)
 239 {
 240         int i;
 241
 242         for (i = 0; i < TILE_MAX_MSHIMS; i++) {
 243                 struct platform_device *pdev = mshim_pdev[i];
 244                 if (!pdev)
 245                         continue;
 246
 247                 platform_set_drvdata(pdev, NULL);
 248                 platform_device_unregister(pdev);
 249         }
 250         platform_driver_unregister(&tile_edac_mc_driver);
 251 }
 252
 253 module_init(tile_edac_init);
 254 module_exit(tile_edac_exit);