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Subject[PATCH 1/4] EDAC, skx_comm_edac: Separate common codes from the skx_edac driver
Date
From: Qiuxu Zhuo <qiuxu.zhuo@intel.com>

Part of the skx_edac driver codes are also used for Intel 10nm server
EDAC driver. Carve out the common part from the skx_edac driver in
preparation to support both skx_edac driver and i10nm_edac driver.

Co-developed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---
drivers/edac/skx_comm_edac.c | 693 +++++++++++++++++++++++++++++++++++
drivers/edac/skx_comm_edac.h | 158 ++++++++
2 files changed, 851 insertions(+)
create mode 100644 drivers/edac/skx_comm_edac.c
create mode 100644 drivers/edac/skx_comm_edac.h

diff --git a/drivers/edac/skx_comm_edac.c b/drivers/edac/skx_comm_edac.c
new file mode 100644
index 000000000000..fd2ccba66874
--- /dev/null
+++ b/drivers/edac/skx_comm_edac.c
@@ -0,0 +1,693 @@
+// 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/string.h>
+#include <linux/uaccess.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/adxl.h>
+#include <acpi/nfit.h>
+#include <asm/mce.h>
+#include <linux/edac.h>
+#include "edac_module.h"
+#include "skx_comm_edac.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, &reg)) {
+ 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, &reg)) {
+ 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, &reg)) {
+ 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], &reg)) {
+ skx_printk(KERN_ERR, "Failed to read tolm\n");
+ goto fail;
+ }
+ skx_tolm = reg;
+
+ if (pci_read_config_dword(pdev, off[1], &reg)) {
+ skx_printk(KERN_ERR, "Failed to read lower tohm\n");
+ goto fail;
+ }
+ skx_tohm = reg;
+
+ if (pci_read_config_dword(pdev, off[2], &reg)) {
+ 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 with Table 15-9 of the Intel Architecture spec vol 3A,
+ * memory errors should fit in this mask:
+ * 000f 0000 1mmm cccc (binary)
+ * 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)) {
+ 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*/
diff --git a/drivers/edac/skx_comm_edac.h b/drivers/edac/skx_comm_edac.h
new file mode 100644
index 000000000000..f7618a9cc0ae
--- /dev/null
+++ b/drivers/edac/skx_comm_edac.h
@@ -0,0 +1,158 @@
+// 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.
+ */
+
+#ifndef _SKX_COMM_EDAC_H
+#define _SKX_COMM_EDAC_H
+
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/adxl.h>
+
+#define MSG_SIZE 1024
+
+/*
+ * Debug macros
+ */
+#define skx_printk(level, fmt, arg...) \
+ edac_printk(level, "skx", fmt, ##arg)
+
+#define skx_mc_printk(mci, level, fmt, arg...) \
+ edac_mc_chipset_printk(mci, level, "skx", fmt, ##arg)
+
+/*
+ * Get a bit field at register value <v>, from bit <lo> to bit <hi>
+ */
+#define GET_BITFIELD(v, lo, hi) \
+ (((v) & GENMASK_ULL((hi), (lo))) >> (lo))
+
+#define SKX_NUM_IMC 2 /* Memory controllers per socket */
+#define SKX_NUM_CHANNELS 3 /* Channels per memory controller */
+#define SKX_NUM_DIMMS 2 /* Max DIMMS per channel */
+
+#define I10NM_NUM_IMC 4
+#define I10NM_NUM_CHANNELS 2
+#define I10NM_NUM_DIMMS 2
+
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#define NUM_IMC MAX(SKX_NUM_IMC, I10NM_NUM_IMC)
+#define NUM_CHANNELS MAX(SKX_NUM_CHANNELS, I10NM_NUM_CHANNELS)
+#define NUM_DIMMS MAX(SKX_NUM_DIMMS, I10NM_NUM_DIMMS)
+
+#define IS_DIMM_PRESENT(r) GET_BITFIELD(r, 15, 15)
+#define IS_NVDIMM_PRESENT(r, i) GET_BITFIELD(r, i, i)
+
+/*
+ * Each cpu socket contains some pci devices that provide global
+ * information, and also some that are local to each of the two
+ * memory controllers on the die.
+ */
+struct skx_dev {
+ struct list_head list;
+ u8 bus[4];
+ int seg;
+ struct pci_dev *sad_all;
+ struct pci_dev *util_all;
+ struct pci_dev *uracu; /* for i10nm CPU */
+ u32 mcroute;
+ struct skx_imc {
+ struct mem_ctl_info *mci;
+ struct pci_dev *mdev; /* for i10nm CPU */
+ void __iomem *mbase; /* for i10nm CPU */
+ u8 mc; /* system wide mc# */
+ u8 lmc; /* socket relative mc# */
+ u8 src_id, node_id;
+ struct skx_channel {
+ struct pci_dev *cdev;
+ struct skx_dimm {
+ u8 close_pg;
+ u8 bank_xor_enable;
+ u8 fine_grain_bank;
+ u8 rowbits;
+ u8 colbits;
+ } dimms[NUM_DIMMS];
+ } chan[NUM_CHANNELS];
+ } imc[NUM_IMC];
+};
+
+struct skx_pvt {
+ struct skx_imc *imc;
+};
+
+enum type {
+ SKX,
+ I10NM
+};
+
+enum {
+ INDEX_SOCKET,
+ INDEX_MEMCTRL,
+ INDEX_CHANNEL,
+ INDEX_DIMM,
+ INDEX_MAX
+};
+
+struct decoded_addr {
+ struct skx_dev *dev;
+ u64 addr;
+ int socket;
+ int imc;
+ int channel;
+ u64 chan_addr;
+ int sktways;
+ int chanways;
+ int dimm;
+ int rank;
+ int channel_rank;
+ u64 rank_address;
+ int row;
+ int column;
+ int bank_address;
+ int bank_group;
+};
+
+typedef int (*get_dimm_config_f)(struct mem_ctl_info *mci);
+typedef bool (*skx_decode_f)(struct decoded_addr *res);
+
+int __init skx_adxl_get(void);
+void __exit skx_adxl_put(void);
+void skx_set_decode(skx_decode_f decode);
+
+int skx_get_src_id(struct skx_dev *d, u8 *id);
+int skx_get_node_id(struct skx_dev *d, u8 *id);
+
+int skx_get_all_bus_mappings(unsigned int did, int off, enum type,
+ struct list_head **list);
+
+int skx_get_hi_lo(unsigned int did, int off[], u64 *tolm, u64 *tohm);
+
+int skx_get_dimm_info(u32 mtr, u32 amap, struct dimm_info *dimm,
+ struct skx_imc *imc, int chan, int dimmno);
+
+int skx_get_nvdimm_info(struct dimm_info *dimm, struct skx_imc *imc,
+ int chan, int dimmno, const char *mod_str);
+
+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);
+
+int skx_mce_check_error(struct notifier_block *nb, unsigned long val,
+ void *data);
+
+void skx_remove(void);
+
+#ifdef CONFIG_EDAC_DEBUG
+void setup_skx_debug(const char *dirname);
+void teardown_skx_debug(void);
+#else
+static inline void setup_skx_debug(const char *dirname) {}
+static inline void teardown_skx_debug(void) {}
+#endif /*CONFIG_EDAC_DEBUG*/
+
+#endif /* _SKX_COMM_EDAC_H */
--
2.19.1
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