/* * Cell MIC driver for ECC counting * * Copyright 2007 Benjamin Herrenschmidt, IBM Corp. * * * This file may be distributed under the terms of the * GNU General Public License. */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include "edac_module.h" struct cell_edac_priv { struct cbe_mic_tm_regs __iomem *regs; int node; int chanmask; #ifdef DEBUG u64 prev_fir; #endif }; static void cell_edac_count_ce(struct mem_ctl_info *mci, int chan, u64 ar) { struct cell_edac_priv *priv = mci->pvt_info; struct csrow_info *csrow = mci->csrows[0]; unsigned long address, pfn, offset, syndrome; dev_dbg(mci->pdev, "ECC CE err on node %d, channel %d, ar = 0x%016llx\n", priv->node, chan, ar); /* Address decoding is likely a bit bogus, to dbl check */ address = (ar & 0xffffffffe0000000ul) >> 29; if (priv->chanmask == 0x3) address = (address << 1) | chan; pfn = address >> PAGE_SHIFT; offset = address & ~PAGE_MASK; syndrome = (ar & 0x000000001fe00000ul) >> 21; /* TODO: Decoding of the error address */ edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, csrow->first_page + pfn, offset, syndrome, 0, chan, -1, "", ""); } static void cell_edac_count_ue(struct mem_ctl_info *mci, int chan, u64 ar) { struct cell_edac_priv *priv = mci->pvt_info; struct csrow_info *csrow = mci->csrows[0]; unsigned long address, pfn, offset; dev_dbg(mci->pdev, "ECC UE err on node %d, channel %d, ar = 0x%016llx\n", priv->node, chan, ar); /* Address decoding is likely a bit bogus, to dbl check */ address = (ar & 0xffffffffe0000000ul) >> 29; if (priv->chanmask == 0x3) address = (address << 1) | chan; pfn = address >> PAGE_SHIFT; offset = address & ~PAGE_MASK; /* TODO: Decoding of the error address */ edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, csrow->first_page + pfn, offset, 0, 0, chan, -1, "", ""); } static void cell_edac_check(struct mem_ctl_info *mci) { struct cell_edac_priv *priv = mci->pvt_info; u64 fir, addreg, clear = 0; fir = in_be64(&priv->regs->mic_fir); #ifdef DEBUG if (fir != priv->prev_fir) { dev_dbg(mci->pdev, "fir change : 0x%016lx\n", fir); priv->prev_fir = fir; } #endif if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_SINGLE_0_ERR)) { addreg = in_be64(&priv->regs->mic_df_ecc_address_0); clear |= CBE_MIC_FIR_ECC_SINGLE_0_RESET; cell_edac_count_ce(mci, 0, addreg); } if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_SINGLE_1_ERR)) { addreg = in_be64(&priv->regs->mic_df_ecc_address_1); clear |= CBE_MIC_FIR_ECC_SINGLE_1_RESET; cell_edac_count_ce(mci, 1, addreg); } if ((priv->chanmask & 0x1) && (fir & CBE_MIC_FIR_ECC_MULTI_0_ERR)) { addreg = in_be64(&priv->regs->mic_df_ecc_address_0); clear |= CBE_MIC_FIR_ECC_MULTI_0_RESET; cell_edac_count_ue(mci, 0, addreg); } if ((priv->chanmask & 0x2) && (fir & CBE_MIC_FIR_ECC_MULTI_1_ERR)) { addreg = in_be64(&priv->regs->mic_df_ecc_address_1); clear |= CBE_MIC_FIR_ECC_MULTI_1_RESET; cell_edac_count_ue(mci, 1, addreg); } /* The procedure for clearing FIR bits is a bit ... weird */ if (clear) { fir &= ~(CBE_MIC_FIR_ECC_ERR_MASK | CBE_MIC_FIR_ECC_SET_MASK); fir |= CBE_MIC_FIR_ECC_RESET_MASK; fir &= ~clear; out_be64(&priv->regs->mic_fir, fir); (void)in_be64(&priv->regs->mic_fir); mb(); /* sync up */ #ifdef DEBUG fir = in_be64(&priv->regs->mic_fir); dev_dbg(mci->pdev, "fir clear : 0x%016lx\n", fir); #endif } } static void cell_edac_init_csrows(struct mem_ctl_info *mci) { struct csrow_info *csrow = mci->csrows[0]; struct dimm_info *dimm; struct cell_edac_priv *priv = mci->pvt_info; struct device_node *np; int j; u32 nr_pages; for_each_node_by_name(np, "memory") { struct resource r; /* We "know" that the Cell firmware only creates one entry * in the "memory" nodes. If that changes, this code will * need to be adapted. */ if (of_address_to_resource(np, 0, &r)) continue; if (of_node_to_nid(np) != priv->node) continue; csrow->first_page = r.start >> PAGE_SHIFT; nr_pages = resource_size(&r) >> PAGE_SHIFT; csrow->last_page = csrow->first_page + nr_pages - 1; for (j = 0; j < csrow->nr_channels; j++) { dimm = csrow->channels[j]->dimm; dimm->mtype = MEM_XDR; dimm->edac_mode = EDAC_SECDED; dimm->nr_pages = nr_pages / csrow->nr_channels; } dev_dbg(mci->pdev, "Initialized on node %d, chanmask=0x%x," " first_page=0x%lx, nr_pages=0x%x\n", priv->node, priv->chanmask, csrow->first_page, nr_pages); break; } of_node_put(np); } static int cell_edac_probe(struct platform_device *pdev) { struct cbe_mic_tm_regs __iomem *regs; struct mem_ctl_info *mci; struct edac_mc_layer layers[2]; struct cell_edac_priv *priv; u64 reg; int rc, chanmask, num_chans; regs = cbe_get_cpu_mic_tm_regs(cbe_node_to_cpu(pdev->id)); if (regs == NULL) return -ENODEV; edac_op_state = EDAC_OPSTATE_POLL; /* Get channel population */ reg = in_be64(®s->mic_mnt_cfg); dev_dbg(&pdev->dev, "MIC_MNT_CFG = 0x%016llx\n", reg); chanmask = 0; if (reg & CBE_MIC_MNT_CFG_CHAN_0_POP) chanmask |= 0x1; if (reg & CBE_MIC_MNT_CFG_CHAN_1_POP) chanmask |= 0x2; if (chanmask == 0) { dev_warn(&pdev->dev, "Yuck ! No channel populated ? Aborting !\n"); return -ENODEV; } dev_dbg(&pdev->dev, "Initial FIR = 0x%016llx\n", in_be64(®s->mic_fir)); /* Allocate & init EDAC MC data structure */ num_chans = chanmask == 3 ? 2 : 1; layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; layers[0].size = 1; layers[0].is_virt_csrow = true; layers[1].type = EDAC_MC_LAYER_CHANNEL; layers[1].size = num_chans; layers[1].is_virt_csrow = false; mci = edac_mc_alloc(pdev->id, ARRAY_SIZE(layers), layers, sizeof(struct cell_edac_priv)); if (mci == NULL) return -ENOMEM; priv = mci->pvt_info; priv->regs = regs; priv->node = pdev->id; priv->chanmask = chanmask; mci->pdev = &pdev->dev; mci->mtype_cap = MEM_FLAG_XDR; mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; mci->edac_cap = EDAC_FLAG_EC | EDAC_FLAG_SECDED; mci->mod_name = "cell_edac"; mci->ctl_name = "MIC"; mci->dev_name = dev_name(&pdev->dev); mci->edac_check = cell_edac_check; cell_edac_init_csrows(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 void cell_edac_remove(struct platform_device *pdev) { struct mem_ctl_info *mci = edac_mc_del_mc(&pdev->dev); if (mci) edac_mc_free(mci); } static struct platform_driver cell_edac_driver = { .driver = { .name = "cbe-mic", }, .probe = cell_edac_probe, .remove = cell_edac_remove, }; static int __init cell_edac_init(void) { /* Sanity check registers data structure */ BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, mic_df_ecc_address_0) != 0xf8); BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, mic_df_ecc_address_1) != 0x1b8); BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, mic_df_config) != 0x218); BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, mic_fir) != 0x230); BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, mic_mnt_cfg) != 0x210); BUILD_BUG_ON(offsetof(struct cbe_mic_tm_regs, mic_exc) != 0x208); return platform_driver_register(&cell_edac_driver); } static void __exit cell_edac_exit(void) { platform_driver_unregister(&cell_edac_driver); } module_init(cell_edac_init); module_exit(cell_edac_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Benjamin Herrenschmidt "); MODULE_DESCRIPTION("ECC counting for Cell MIC");