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->pdev, "ECC CE err on node %d\n", priv->node);
  73                 priv->ce_count = mem_error.sbe_count;
  74                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
  75                                      0, 0, 0,
  76                                      0, 0, -1,
  77                                      mci->ctl_name, "");
  78         }
  79 }
  80
  81 /*
  82  * Initialize the 'csrows' table within the mci control structure with the
  83  * addressing of memory.
  84  */
  85 static int tile_edac_init_csrows(struct mem_ctl_info *mci)
  86 {
  87         struct csrow_info       *csrow = mci->csrows[0];
  88         struct tile_edac_priv   *priv = mci->pvt_info;
  89         struct mshim_mem_info   mem_info;
  90         struct dimm_info *dimm = csrow->channels[0]->dimm;
  91
  92         if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info,
  93                 sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) !=
  94                 sizeof(struct mshim_mem_info)) {
  95                 pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n");
  96                 return -1;
  97         }
  98
  99         if (mem_info.mem_ecc)
 100                 dimm->edac_mode = EDAC_SECDED;
 101         else
 102                 dimm->edac_mode = EDAC_NONE;
 103         switch (mem_info.mem_type) {
 104         case DDR2:
 105                 dimm->mtype = MEM_DDR2;
 106                 break;
 107
 108         case DDR3:
 109                 dimm->mtype = MEM_DDR3;
 110                 break;
 111
 112         default:
 113                 return -1;
 114         }
 115
 116         dimm->nr_pages = mem_info.mem_size >> PAGE_SHIFT;
 117         dimm->grain = TILE_EDAC_ERROR_GRAIN;
 118         dimm->dtype = DEV_UNKNOWN;
 119
 120         return 0;
 121 }
 122
 123 static int tile_edac_mc_probe(struct platform_device *pdev)
 124 {
 125         char                    hv_file[32];
 126         int                     hv_devhdl;
 127         struct mem_ctl_info     *mci;
 128         struct edac_mc_layer    layers[2];
 129         struct tile_edac_priv   *priv;
 130         int                     rc;
 131
 132         sprintf(hv_file, "mshim/%d", pdev->id);
 133         hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0);
 134         if (hv_devhdl < 0)
 135                 return -EINVAL;
 136
 137         /* A TILE MC has a single channel and one chip-select row. */
 138         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 139         layers[0].size = TILE_EDAC_NR_CSROWS;
 140         layers[0].is_virt_csrow = true;
 141         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 142         layers[1].size = TILE_EDAC_NR_CHANS;
 143         layers[1].is_virt_csrow = false;
 144         mci = edac_mc_alloc(pdev->id, ARRAY_SIZE(layers), layers,
 145                             sizeof(struct tile_edac_priv));
 146         if (mci == NULL)
 147                 return -ENOMEM;
 148         priv = mci->pvt_info;
 149         priv->node = pdev->id;
 150         priv->hv_devhdl = hv_devhdl;
 151
 152         mci->pdev = &pdev->dev;
 153         mci->mtype_cap = MEM_FLAG_DDR2;
 154         mci->edac_ctl_cap = EDAC_FLAG_SECDED;
 155
 156         mci->mod_name = DRV_NAME;
 157 #ifdef __tilegx__
 158         mci->ctl_name = "TILEGx_Memory_Controller";
 159 #else
 160         mci->ctl_name = "TILEPro_Memory_Controller";
 161 #endif
 162         mci->dev_name = dev_name(&pdev->dev);
 163         mci->edac_check = tile_edac_check;
 164
 165         /*
 166          * Initialize the MC control structure 'csrows' table
 167          * with the mapping and control information.
 168          */
 169         if (tile_edac_init_csrows(mci)) {
 170                 /* No csrows found. */
 171                 mci->edac_cap = EDAC_FLAG_NONE;
 172         } else {
 173                 mci->edac_cap = EDAC_FLAG_SECDED;
 174         }
 175
 176         platform_set_drvdata(pdev, mci);
 177
 178         /* Register with EDAC core */
 179         rc = edac_mc_add_mc(mci);
 180         if (rc) {
 181                 dev_err(&pdev->dev, "failed to register with EDAC core\n");
 182                 edac_mc_free(mci);
 183                 return rc;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int tile_edac_mc_remove(struct platform_device *pdev)
 190 {
 191         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 192
 193         edac_mc_del_mc(&pdev->dev);
 194         if (mci)
 195                 edac_mc_free(mci);
 196         return 0;
 197 }
 198
 199 static struct platform_driver tile_edac_mc_driver = {
 200         .driver         = {
 201                 .name   = DRV_NAME,
 202                 .owner  = THIS_MODULE,
 203         },
 204         .probe          = tile_edac_mc_probe,
 205         .remove         = tile_edac_mc_remove,
 206 };
 207
 208 /*
 209  * Driver init routine.
 210  */
 211 static int __init tile_edac_init(void)
 212 {
 213         char    hv_file[32];
 214         struct platform_device *pdev;
 215         int i, err, num = 0;
 216
 217         /* Only support POLL mode. */
 218         edac_op_state = EDAC_OPSTATE_POLL;
 219
 220         err = platform_driver_register(&tile_edac_mc_driver);
 221         if (err)
 222                 return err;
 223
 224         for (i = 0; i < TILE_MAX_MSHIMS; i++) {
 225                 /*
 226                  * Not all memory controllers are configured such as in the
 227                  * case of a simulator. So we register only those mshims
 228                  * that are configured by the hypervisor.
 229                  */
 230                 sprintf(hv_file, "mshim/%d", i);
 231                 if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0)
 232                         continue;
 233
 234                 pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0);
 235                 if (IS_ERR(pdev))
 236                         continue;
 237                 mshim_pdev[i] = pdev;
 238                 num++;
 239         }
 240
 241         if (num == 0) {
 242                 platform_driver_unregister(&tile_edac_mc_driver);
 243                 return -ENODEV;
 244         }
 245         return 0;
 246 }
 247
 248 /*
 249  * Driver cleanup routine.
 250  */
 251 static void __exit tile_edac_exit(void)
 252 {
 253         int i;
 254
 255         for (i = 0; i < TILE_MAX_MSHIMS; i++) {
 256                 struct platform_device *pdev = mshim_pdev[i];
 257                 if (!pdev)
 258                         continue;
 259
 260                 platform_device_unregister(pdev);
 261         }
 262         platform_driver_unregister(&tile_edac_mc_driver);
 263 }
 264
 265 module_init(tile_edac_init);
 266 module_exit(tile_edac_exit);