/* * Copyright 2011 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. * Tilera-specific EDAC driver. * * This source code is derived from the following driver: * * Cell MIC driver for ECC counting * * Copyright 2007 Benjamin Herrenschmidt, IBM Corp. * * */ #include #include #include #include #include #include #include #include #include "edac_core.h" #define DRV_NAME "tile-edac" /* Number of cs_rows needed per memory controller on TILEPro. */ #define TILE_EDAC_NR_CSROWS 1 /* Number of channels per memory controller on TILEPro. */ #define TILE_EDAC_NR_CHANS 1 /* Granularity of reported error in bytes on TILEPro. */ #define TILE_EDAC_ERROR_GRAIN 8 /* TILE processor has multiple independent memory controllers. */ struct platform_device *mshim_pdev[TILE_MAX_MSHIMS]; struct tile_edac_priv { int hv_devhdl; /* Hypervisor device handle. */ int node; /* Memory controller instance #. */ unsigned int ce_count; /* * Correctable-error counter * kept by the driver. */ }; static void tile_edac_check(struct mem_ctl_info *mci) { struct tile_edac_priv *priv = mci->pvt_info; struct mshim_mem_error mem_error; if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_error, sizeof(struct mshim_mem_error), MSHIM_MEM_ERROR_OFF) != sizeof(struct mshim_mem_error)) { pr_err(DRV_NAME ": MSHIM_MEM_ERROR_OFF pread failure.\n"); return; } /* Check if the current error count is different from the saved one. */ if (mem_error.sbe_count != priv->ce_count) { dev_dbg(mci->pdev, "ECC CE err on node %d\n", priv->node); priv->ce_count = mem_error.sbe_count; edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 0, 0, 0, 0, 0, -1, mci->ctl_name, ""); } } /* * Initialize the 'csrows' table within the mci control structure with the * addressing of memory. */ static int tile_edac_init_csrows(struct mem_ctl_info *mci) { struct csrow_info *csrow = mci->csrows[0]; struct tile_edac_priv *priv = mci->pvt_info; struct mshim_mem_info mem_info; struct dimm_info *dimm = csrow->channels[0]->dimm; if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info, sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) != sizeof(struct mshim_mem_info)) { pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n"); return -1; } if (mem_info.mem_ecc) dimm->edac_mode = EDAC_SECDED; else dimm->edac_mode = EDAC_NONE; switch (mem_info.mem_type) { case DDR2: dimm->mtype = MEM_DDR2; break; case DDR3: dimm->mtype = MEM_DDR3; break; default: return -1; } dimm->nr_pages = mem_info.mem_size >> PAGE_SHIFT; dimm->grain = TILE_EDAC_ERROR_GRAIN; dimm->dtype = DEV_UNKNOWN; return 0; } static int tile_edac_mc_probe(struct platform_device *pdev) { char hv_file[32]; int hv_devhdl; struct mem_ctl_info *mci; struct edac_mc_layer layers[2]; struct tile_edac_priv *priv; int rc; sprintf(hv_file, "mshim/%d", pdev->id); hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0); if (hv_devhdl < 0) return -EINVAL; /* A TILE MC has a single channel and one chip-select row. */ layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; layers[0].size = TILE_EDAC_NR_CSROWS; layers[0].is_virt_csrow = true; layers[1].type = EDAC_MC_LAYER_CHANNEL; layers[1].size = TILE_EDAC_NR_CHANS; layers[1].is_virt_csrow = false; mci = edac_mc_alloc(pdev->id, ARRAY_SIZE(layers), layers, sizeof(struct tile_edac_priv)); if (mci == NULL) return -ENOMEM; priv = mci->pvt_info; priv->node = pdev->id; priv->hv_devhdl = hv_devhdl; mci->pdev = &pdev->dev; mci->mtype_cap = MEM_FLAG_DDR2; mci->edac_ctl_cap = EDAC_FLAG_SECDED; mci->mod_name = DRV_NAME; #ifdef __tilegx__ mci->ctl_name = "TILEGx_Memory_Controller"; #else mci->ctl_name = "TILEPro_Memory_Controller"; #endif mci->dev_name = dev_name(&pdev->dev); mci->edac_check = tile_edac_check; /* * Initialize the MC control structure 'csrows' table * with the mapping and control information. */ if (tile_edac_init_csrows(mci)) { /* No csrows found. */ mci->edac_cap = EDAC_FLAG_NONE; } else { mci->edac_cap = EDAC_FLAG_SECDED; } platform_set_drvdata(pdev, mci); /* Register with EDAC core */ rc = edac_mc_add_mc(mci); if (rc) { dev_err(&pdev->dev, "failed to register with EDAC core\n"); edac_mc_free(mci); return rc; } return 0; } static int tile_edac_mc_remove(struct platform_device *pdev) { struct mem_ctl_info *mci = platform_get_drvdata(pdev); edac_mc_del_mc(&pdev->dev); if (mci) edac_mc_free(mci); return 0; } static struct platform_driver tile_edac_mc_driver = { .driver = { .name = DRV_NAME, .owner = THIS_MODULE, }, .probe = tile_edac_mc_probe, .remove = tile_edac_mc_remove, }; /* * Driver init routine. */ static int __init tile_edac_init(void) { char hv_file[32]; struct platform_device *pdev; int i, err, num = 0; /* Only support POLL mode. */ edac_op_state = EDAC_OPSTATE_POLL; err = platform_driver_register(&tile_edac_mc_driver); if (err) return err; for (i = 0; i < TILE_MAX_MSHIMS; i++) { /* * Not all memory controllers are configured such as in the * case of a simulator. So we register only those mshims * that are configured by the hypervisor. */ sprintf(hv_file, "mshim/%d", i); if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0) continue; pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0); if (IS_ERR(pdev)) continue; mshim_pdev[i] = pdev; num++; } if (num == 0) { platform_driver_unregister(&tile_edac_mc_driver); return -ENODEV; } return 0; } /* * Driver cleanup routine. */ static void __exit tile_edac_exit(void) { int i; for (i = 0; i < TILE_MAX_MSHIMS; i++) { struct platform_device *pdev = mshim_pdev[i]; if (!pdev) continue; platform_device_unregister(pdev); } platform_driver_unregister(&tile_edac_mc_driver); } module_init(tile_edac_init); module_exit(tile_edac_exit);