diff options
Diffstat (limited to 'drivers/edac/skx_common.c')
| -rw-r--r-- | drivers/edac/skx_common.c | 691 |
1 files changed, 691 insertions, 0 deletions
diff --git a/drivers/edac/skx_common.c b/drivers/edac/skx_common.c new file mode 100644 index 000000000000..0e96e7b5b0a7 --- /dev/null +++ b/drivers/edac/skx_common.c @@ -0,0 +1,691 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Common codes for both the skx_edac driver and Intel 10nm server EDAC driver. + * Originally split out from the skx_edac driver. + * + * Copyright (c) 2018, Intel Corporation. + */ + +#include <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/adxl.h> +#include <acpi/nfit.h> +#include <asm/mce.h> +#include "edac_module.h" +#include "skx_common.h" + +static const char * const component_names[] = { + [INDEX_SOCKET] = "ProcessorSocketId", + [INDEX_MEMCTRL] = "MemoryControllerId", + [INDEX_CHANNEL] = "ChannelId", + [INDEX_DIMM] = "DimmSlotId", +}; + +static int component_indices[ARRAY_SIZE(component_names)]; +static int adxl_component_count; +static const char * const *adxl_component_names; +static u64 *adxl_values; +static char *adxl_msg; + +static char skx_msg[MSG_SIZE]; +static skx_decode_f skx_decode; +static u64 skx_tolm, skx_tohm; +static LIST_HEAD(dev_edac_list); + +int __init skx_adxl_get(void) +{ + const char * const *names; + int i, j; + + names = adxl_get_component_names(); + if (!names) { + skx_printk(KERN_NOTICE, "No firmware support for address translation.\n"); + return -ENODEV; + } + + for (i = 0; i < INDEX_MAX; i++) { + for (j = 0; names[j]; j++) { + if (!strcmp(component_names[i], names[j])) { + component_indices[i] = j; + break; + } + } + + if (!names[j]) + goto err; + } + + adxl_component_names = names; + while (*names++) + adxl_component_count++; + + adxl_values = kcalloc(adxl_component_count, sizeof(*adxl_values), + GFP_KERNEL); + if (!adxl_values) { + adxl_component_count = 0; + return -ENOMEM; + } + + adxl_msg = kzalloc(MSG_SIZE, GFP_KERNEL); + if (!adxl_msg) { + adxl_component_count = 0; + kfree(adxl_values); + return -ENOMEM; + } + + return 0; +err: + skx_printk(KERN_ERR, "'%s' is not matched from DSM parameters: ", + component_names[i]); + for (j = 0; names[j]; j++) + skx_printk(KERN_CONT, "%s ", names[j]); + skx_printk(KERN_CONT, "\n"); + + return -ENODEV; +} + +void __exit skx_adxl_put(void) +{ + kfree(adxl_values); + kfree(adxl_msg); +} + +static bool skx_adxl_decode(struct decoded_addr *res) +{ + int i, len = 0; + + if (res->addr >= skx_tohm || (res->addr >= skx_tolm && + res->addr < BIT_ULL(32))) { + edac_dbg(0, "Address 0x%llx out of range\n", res->addr); + return false; + } + + if (adxl_decode(res->addr, adxl_values)) { + edac_dbg(0, "Failed to decode 0x%llx\n", res->addr); + return false; + } + + res->socket = (int)adxl_values[component_indices[INDEX_SOCKET]]; + res->imc = (int)adxl_values[component_indices[INDEX_MEMCTRL]]; + res->channel = (int)adxl_values[component_indices[INDEX_CHANNEL]]; + res->dimm = (int)adxl_values[component_indices[INDEX_DIMM]]; + + for (i = 0; i < adxl_component_count; i++) { + if (adxl_values[i] == ~0x0ull) + continue; + + len += snprintf(adxl_msg + len, MSG_SIZE - len, " %s:0x%llx", + adxl_component_names[i], adxl_values[i]); + if (MSG_SIZE - len <= 0) + break; + } + + return true; +} + +void skx_set_decode(skx_decode_f decode) +{ + skx_decode = decode; +} + +int skx_get_src_id(struct skx_dev *d, u8 *id) +{ + u32 reg; + + if (pci_read_config_dword(d->util_all, 0xf0, ®)) { + skx_printk(KERN_ERR, "Failed to read src id\n"); + return -ENODEV; + } + + *id = GET_BITFIELD(reg, 12, 14); + return 0; +} + +int skx_get_node_id(struct skx_dev *d, u8 *id) +{ + u32 reg; + + if (pci_read_config_dword(d->util_all, 0xf4, ®)) { + skx_printk(KERN_ERR, "Failed to read node id\n"); + return -ENODEV; + } + + *id = GET_BITFIELD(reg, 0, 2); + return 0; +} + +static int get_width(u32 mtr) +{ + switch (GET_BITFIELD(mtr, 8, 9)) { + case 0: + return DEV_X4; + case 1: + return DEV_X8; + case 2: + return DEV_X16; + } + return DEV_UNKNOWN; +} + +/* + * We use the per-socket device @did to count how many sockets are present, + * and to detemine which PCI buses are associated with each socket. Allocate + * and build the full list of all the skx_dev structures that we need here. + */ +int skx_get_all_bus_mappings(unsigned int did, int off, enum type type, + struct list_head **list) +{ + struct pci_dev *pdev, *prev; + struct skx_dev *d; + u32 reg; + int ndev = 0; + + prev = NULL; + for (;;) { + pdev = pci_get_device(PCI_VENDOR_ID_INTEL, did, prev); + if (!pdev) + break; + ndev++; + d = kzalloc(sizeof(*d), GFP_KERNEL); + if (!d) { + pci_dev_put(pdev); + return -ENOMEM; + } + + if (pci_read_config_dword(pdev, off, ®)) { + kfree(d); + pci_dev_put(pdev); + skx_printk(KERN_ERR, "Failed to read bus idx\n"); + return -ENODEV; + } + + d->bus[0] = GET_BITFIELD(reg, 0, 7); + d->bus[1] = GET_BITFIELD(reg, 8, 15); + if (type == SKX) { + d->seg = pci_domain_nr(pdev->bus); + d->bus[2] = GET_BITFIELD(reg, 16, 23); + d->bus[3] = GET_BITFIELD(reg, 24, 31); + } else { + d->seg = GET_BITFIELD(reg, 16, 23); + } + + edac_dbg(2, "busses: 0x%x, 0x%x, 0x%x, 0x%x\n", + d->bus[0], d->bus[1], d->bus[2], d->bus[3]); + list_add_tail(&d->list, &dev_edac_list); + prev = pdev; + } + + if (list) + *list = &dev_edac_list; + return ndev; +} + +int skx_get_hi_lo(unsigned int did, int off[], u64 *tolm, u64 *tohm) +{ + struct pci_dev *pdev; + u32 reg; + + pdev = pci_get_device(PCI_VENDOR_ID_INTEL, did, NULL); + if (!pdev) { + skx_printk(KERN_ERR, "Can't get tolm/tohm\n"); + return -ENODEV; + } + + if (pci_read_config_dword(pdev, off[0], ®)) { + skx_printk(KERN_ERR, "Failed to read tolm\n"); + goto fail; + } + skx_tolm = reg; + + if (pci_read_config_dword(pdev, off[1], ®)) { + skx_printk(KERN_ERR, "Failed to read lower tohm\n"); + goto fail; + } + skx_tohm = reg; + + if (pci_read_config_dword(pdev, off[2], ®)) { + skx_printk(KERN_ERR, "Failed to read upper tohm\n"); + goto fail; + } + skx_tohm |= (u64)reg << 32; + + pci_dev_put(pdev); + *tolm = skx_tolm; + *tohm = skx_tohm; + edac_dbg(2, "tolm = 0x%llx tohm = 0x%llx\n", skx_tolm, skx_tohm); + return 0; +fail: + pci_dev_put(pdev); + return -ENODEV; +} + +static int skx_get_dimm_attr(u32 reg, int lobit, int hibit, int add, + int minval, int maxval, const char *name) +{ + u32 val = GET_BITFIELD(reg, lobit, hibit); + + if (val < minval || val > maxval) { + edac_dbg(2, "bad %s = %d (raw=0x%x)\n", name, val, reg); + return -EINVAL; + } + return val + add; +} + +#define numrank(reg) skx_get_dimm_attr(reg, 12, 13, 0, 0, 2, "ranks") +#define numrow(reg) skx_get_dimm_attr(reg, 2, 4, 12, 1, 6, "rows") +#define numcol(reg) skx_get_dimm_attr(reg, 0, 1, 10, 0, 2, "cols") + +int skx_get_dimm_info(u32 mtr, u32 amap, struct dimm_info *dimm, + struct skx_imc *imc, int chan, int dimmno) +{ + int banks = 16, ranks, rows, cols, npages; + u64 size; + + ranks = numrank(mtr); + rows = numrow(mtr); + cols = numcol(mtr); + + /* + * Compute size in 8-byte (2^3) words, then shift to MiB (2^20) + */ + size = ((1ull << (rows + cols + ranks)) * banks) >> (20 - 3); + npages = MiB_TO_PAGES(size); + + edac_dbg(0, "mc#%d: channel %d, dimm %d, %lld MiB (%d pages) bank: %d, rank: %d, row: 0x%x, col: 0x%x\n", + imc->mc, chan, dimmno, size, npages, + banks, 1 << ranks, rows, cols); + + imc->chan[chan].dimms[dimmno].close_pg = GET_BITFIELD(mtr, 0, 0); + imc->chan[chan].dimms[dimmno].bank_xor_enable = GET_BITFIELD(mtr, 9, 9); + imc->chan[chan].dimms[dimmno].fine_grain_bank = GET_BITFIELD(amap, 0, 0); + imc->chan[chan].dimms[dimmno].rowbits = rows; + imc->chan[chan].dimms[dimmno].colbits = cols; + + dimm->nr_pages = npages; + dimm->grain = 32; + dimm->dtype = get_width(mtr); + dimm->mtype = MEM_DDR4; + dimm->edac_mode = EDAC_SECDED; /* likely better than this */ + snprintf(dimm->label, sizeof(dimm->label), "CPU_SrcID#%u_MC#%u_Chan#%u_DIMM#%u", + imc->src_id, imc->lmc, chan, dimmno); + + return 1; +} + +int skx_get_nvdimm_info(struct dimm_info *dimm, struct skx_imc *imc, + int chan, int dimmno, const char *mod_str) +{ + int smbios_handle; + u32 dev_handle; + u16 flags; + u64 size = 0; + + dev_handle = ACPI_NFIT_BUILD_DEVICE_HANDLE(dimmno, chan, imc->lmc, + imc->src_id, 0); + + smbios_handle = nfit_get_smbios_id(dev_handle, &flags); + if (smbios_handle == -EOPNOTSUPP) { + pr_warn_once("%s: Can't find size of NVDIMM. Try enabling CONFIG_ACPI_NFIT\n", mod_str); + goto unknown_size; + } + + if (smbios_handle < 0) { + skx_printk(KERN_ERR, "Can't find handle for NVDIMM ADR=0x%x\n", dev_handle); + goto unknown_size; + } + + if (flags & ACPI_NFIT_MEM_MAP_FAILED) { + skx_printk(KERN_ERR, "NVDIMM ADR=0x%x is not mapped\n", dev_handle); + goto unknown_size; + } + + size = dmi_memdev_size(smbios_handle); + if (size == ~0ull) + skx_printk(KERN_ERR, "Can't find size for NVDIMM ADR=0x%x/SMBIOS=0x%x\n", + dev_handle, smbios_handle); + +unknown_size: + dimm->nr_pages = size >> PAGE_SHIFT; + dimm->grain = 32; + dimm->dtype = DEV_UNKNOWN; + dimm->mtype = MEM_NVDIMM; + dimm->edac_mode = EDAC_SECDED; /* likely better than this */ + + edac_dbg(0, "mc#%d: channel %d, dimm %d, %llu MiB (%u pages)\n", + imc->mc, chan, dimmno, size >> 20, dimm->nr_pages); + + snprintf(dimm->label, sizeof(dimm->label), "CPU_SrcID#%u_MC#%u_Chan#%u_DIMM#%u", + imc->src_id, imc->lmc, chan, dimmno); + + return (size == 0 || size == ~0ull) ? 0 : 1; +} + +int skx_register_mci(struct skx_imc *imc, struct pci_dev *pdev, + const char *ctl_name, const char *mod_str, + get_dimm_config_f get_dimm_config) +{ + struct mem_ctl_info *mci; + struct edac_mc_layer layers[2]; + struct skx_pvt *pvt; + int rc; + + /* Allocate a new MC control structure */ + layers[0].type = EDAC_MC_LAYER_CHANNEL; + layers[0].size = NUM_CHANNELS; + layers[0].is_virt_csrow = false; + layers[1].type = EDAC_MC_LAYER_SLOT; + layers[1].size = NUM_DIMMS; + layers[1].is_virt_csrow = true; + mci = edac_mc_alloc(imc->mc, ARRAY_SIZE(layers), layers, + sizeof(struct skx_pvt)); + + if (unlikely(!mci)) + return -ENOMEM; + + edac_dbg(0, "MC#%d: mci = %p\n", imc->mc, mci); + + /* Associate skx_dev and mci for future usage */ + imc->mci = mci; + pvt = mci->pvt_info; + pvt->imc = imc; + + mci->ctl_name = kasprintf(GFP_KERNEL, "%s#%d IMC#%d", ctl_name, + imc->node_id, imc->lmc); + if (!mci->ctl_name) { + rc = -ENOMEM; + goto fail0; + } + + mci->mtype_cap = MEM_FLAG_DDR4 | MEM_FLAG_NVDIMM; + mci->edac_ctl_cap = EDAC_FLAG_NONE; + mci->edac_cap = EDAC_FLAG_NONE; + mci->mod_name = mod_str; + mci->dev_name = pci_name(pdev); + mci->ctl_page_to_phys = NULL; + + rc = get_dimm_config(mci); + if (rc < 0) + goto fail; + + /* Record ptr to the generic device */ + mci->pdev = &pdev->dev; + + /* Add this new MC control structure to EDAC's list of MCs */ + if (unlikely(edac_mc_add_mc(mci))) { + edac_dbg(0, "MC: failed edac_mc_add_mc()\n"); + rc = -EINVAL; + goto fail; + } + + return 0; + +fail: + kfree(mci->ctl_name); +fail0: + edac_mc_free(mci); + imc->mci = NULL; + return rc; +} + +static void skx_unregister_mci(struct skx_imc *imc) +{ + struct mem_ctl_info *mci = imc->mci; + + if (!mci) + return; + + edac_dbg(0, "MC%d: mci = %p\n", imc->mc, mci); + + /* Remove MC sysfs nodes */ + edac_mc_del_mc(mci->pdev); + + edac_dbg(1, "%s: free mci struct\n", mci->ctl_name); + kfree(mci->ctl_name); + edac_mc_free(mci); +} + +static struct mem_ctl_info *get_mci(int src_id, int lmc) +{ + struct skx_dev *d; + + if (lmc > NUM_IMC - 1) { + skx_printk(KERN_ERR, "Bad lmc %d\n", lmc); + return NULL; + } + + list_for_each_entry(d, &dev_edac_list, list) { + if (d->imc[0].src_id == src_id) + return d->imc[lmc].mci; + } + + skx_printk(KERN_ERR, "No mci for src_id %d lmc %d\n", src_id, lmc); + return NULL; +} + +static void skx_mce_output_error(struct mem_ctl_info *mci, + const struct mce *m, + struct decoded_addr *res) +{ + enum hw_event_mc_err_type tp_event; + char *type, *optype; + bool ripv = GET_BITFIELD(m->mcgstatus, 0, 0); + bool overflow = GET_BITFIELD(m->status, 62, 62); + bool uncorrected_error = GET_BITFIELD(m->status, 61, 61); + bool recoverable; + u32 core_err_cnt = GET_BITFIELD(m->status, 38, 52); + u32 mscod = GET_BITFIELD(m->status, 16, 31); + u32 errcode = GET_BITFIELD(m->status, 0, 15); + u32 optypenum = GET_BITFIELD(m->status, 4, 6); + + recoverable = GET_BITFIELD(m->status, 56, 56); + + if (uncorrected_error) { + core_err_cnt = 1; + if (ripv) { + type = "FATAL"; + tp_event = HW_EVENT_ERR_FATAL; + } else { + type = "NON_FATAL"; + tp_event = HW_EVENT_ERR_UNCORRECTED; + } + } else { + type = "CORRECTED"; + tp_event = HW_EVENT_ERR_CORRECTED; + } + + /* + * According to Intel Architecture spec vol 3B, + * Table 15-10 "IA32_MCi_Status [15:0] Compound Error Code Encoding" + * memory errors should fit one of these masks: + * 000f 0000 1mmm cccc (binary) + * 000f 0010 1mmm cccc (binary) [RAM used as cache] + * where: + * f = Correction Report Filtering Bit. If 1, subsequent errors + * won't be shown + * mmm = error type + * cccc = channel + * If the mask doesn't match, report an error to the parsing logic + */ + if (!((errcode & 0xef80) == 0x80 || (errcode & 0xef80) == 0x280)) { + optype = "Can't parse: it is not a mem"; + } else { + switch (optypenum) { + case 0: + optype = "generic undef request error"; + break; + case 1: + optype = "memory read error"; + break; + case 2: + optype = "memory write error"; + break; + case 3: + optype = "addr/cmd error"; + break; + case 4: + optype = "memory scrubbing error"; + break; + default: + optype = "reserved"; + break; + } + } + if (adxl_component_count) { + snprintf(skx_msg, MSG_SIZE, "%s%s err_code:0x%04x:0x%04x %s", + overflow ? " OVERFLOW" : "", + (uncorrected_error && recoverable) ? " recoverable" : "", + mscod, errcode, adxl_msg); + } else { + snprintf(skx_msg, MSG_SIZE, + "%s%s err_code:0x%04x:0x%04x socket:%d imc:%d rank:%d bg:%d ba:%d row:0x%x col:0x%x", + overflow ? " OVERFLOW" : "", + (uncorrected_error && recoverable) ? " recoverable" : "", + mscod, errcode, + res->socket, res->imc, res->rank, + res->bank_group, res->bank_address, res->row, res->column); + } + + edac_dbg(0, "%s\n", skx_msg); + + /* Call the helper to output message */ + edac_mc_handle_error(tp_event, mci, core_err_cnt, + m->addr >> PAGE_SHIFT, m->addr & ~PAGE_MASK, 0, + res->channel, res->dimm, -1, + optype, skx_msg); +} + +int skx_mce_check_error(struct notifier_block *nb, unsigned long val, + void *data) +{ + struct mce *mce = (struct mce *)data; + struct decoded_addr res; + struct mem_ctl_info *mci; + char *type; + + if (edac_get_report_status() == EDAC_REPORTING_DISABLED) + return NOTIFY_DONE; + + /* ignore unless this is memory related with an address */ + if ((mce->status & 0xefff) >> 7 != 1 || !(mce->status & MCI_STATUS_ADDRV)) + return NOTIFY_DONE; + + memset(&res, 0, sizeof(res)); + res.addr = mce->addr; + + if (adxl_component_count) { + if (!skx_adxl_decode(&res)) + return NOTIFY_DONE; + + mci = get_mci(res.socket, res.imc); + } else { + if (!skx_decode || !skx_decode(&res)) + return NOTIFY_DONE; + + mci = res.dev->imc[res.imc].mci; + } + + if (!mci) + return NOTIFY_DONE; + + if (mce->mcgstatus & MCG_STATUS_MCIP) + type = "Exception"; + else + type = "Event"; + + skx_mc_printk(mci, KERN_DEBUG, "HANDLING MCE MEMORY ERROR\n"); + + skx_mc_printk(mci, KERN_DEBUG, "CPU %d: Machine Check %s: 0x%llx " + "Bank %d: 0x%llx\n", mce->extcpu, type, + mce->mcgstatus, mce->bank, mce->status); + skx_mc_printk(mci, KERN_DEBUG, "TSC 0x%llx ", mce->tsc); + skx_mc_printk(mci, KERN_DEBUG, "ADDR 0x%llx ", mce->addr); + skx_mc_printk(mci, KERN_DEBUG, "MISC 0x%llx ", mce->misc); + + skx_mc_printk(mci, KERN_DEBUG, "PROCESSOR %u:0x%x TIME %llu SOCKET " + "%u APIC 0x%x\n", mce->cpuvendor, mce->cpuid, + mce->time, mce->socketid, mce->apicid); + + skx_mce_output_error(mci, mce, &res); + + return NOTIFY_DONE; +} + +void skx_remove(void) +{ + int i, j; + struct skx_dev *d, *tmp; + + edac_dbg(0, "\n"); + + list_for_each_entry_safe(d, tmp, &dev_edac_list, list) { + list_del(&d->list); + for (i = 0; i < NUM_IMC; i++) { + if (d->imc[i].mci) + skx_unregister_mci(&d->imc[i]); + + if (d->imc[i].mdev) + pci_dev_put(d->imc[i].mdev); + + if (d->imc[i].mbase) + iounmap(d->imc[i].mbase); + + for (j = 0; j < NUM_CHANNELS; j++) { + if (d->imc[i].chan[j].cdev) + pci_dev_put(d->imc[i].chan[j].cdev); + } + } + if (d->util_all) + pci_dev_put(d->util_all); + if (d->sad_all) + pci_dev_put(d->sad_all); + if (d->uracu) + pci_dev_put(d->uracu); + + kfree(d); + } +} + +#ifdef CONFIG_EDAC_DEBUG +/* + * Debug feature. + * Exercise the address decode logic by writing an address to + * /sys/kernel/debug/edac/dirname/addr. + */ +static struct dentry *skx_test; + +static int debugfs_u64_set(void *data, u64 val) +{ + struct mce m; + + pr_warn_once("Fake error to 0x%llx injected via debugfs\n", val); + + memset(&m, 0, sizeof(m)); + /* ADDRV + MemRd + Unknown channel */ + m.status = MCI_STATUS_ADDRV + 0x90; + /* One corrected error */ + m.status |= BIT_ULL(MCI_STATUS_CEC_SHIFT); + m.addr = val; + skx_mce_check_error(NULL, 0, &m); + + return 0; +} +DEFINE_SIMPLE_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n"); + +void setup_skx_debug(const char *dirname) +{ + skx_test = edac_debugfs_create_dir(dirname); + if (!skx_test) + return; + + if (!edac_debugfs_create_file("addr", 0200, skx_test, + NULL, &fops_u64_wo)) { + debugfs_remove(skx_test); + skx_test = NULL; + } +} + +void teardown_skx_debug(void) +{ + debugfs_remove_recursive(skx_test); +} +#endif /*CONFIG_EDAC_DEBUG*/ |