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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Bluefield-specific EDAC driver.
- *
- * Copyright (c) 2019 Mellanox Technologies.
- */
- #include <linux/acpi.h>
- #include <linux/arm-smccc.h>
- #include <linux/bitfield.h>
- #include <linux/edac.h>
- #include <linux/io.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include "edac_module.h"
- #define DRIVER_NAME "bluefield-edac"
- /*
- * Mellanox BlueField EMI (External Memory Interface) register definitions.
- */
- #define MLXBF_ECC_CNT 0x340
- #define MLXBF_ECC_CNT__SERR_CNT GENMASK(15, 0)
- #define MLXBF_ECC_CNT__DERR_CNT GENMASK(31, 16)
- #define MLXBF_ECC_ERR 0x348
- #define MLXBF_ECC_ERR__SECC BIT(0)
- #define MLXBF_ECC_ERR__DECC BIT(16)
- #define MLXBF_ECC_LATCH_SEL 0x354
- #define MLXBF_ECC_LATCH_SEL__START BIT(24)
- #define MLXBF_ERR_ADDR_0 0x358
- #define MLXBF_ERR_ADDR_1 0x37c
- #define MLXBF_SYNDROM 0x35c
- #define MLXBF_SYNDROM__DERR BIT(0)
- #define MLXBF_SYNDROM__SERR BIT(1)
- #define MLXBF_SYNDROM__SYN GENMASK(25, 16)
- #define MLXBF_ADD_INFO 0x364
- #define MLXBF_ADD_INFO__ERR_PRANK GENMASK(9, 8)
- #define MLXBF_EDAC_MAX_DIMM_PER_MC 2
- #define MLXBF_EDAC_ERROR_GRAIN 8
- /*
- * Request MLNX_SIP_GET_DIMM_INFO
- *
- * Retrieve information about DIMM on a certain slot.
- *
- * Call register usage:
- * a0: MLNX_SIP_GET_DIMM_INFO
- * a1: (Memory controller index) << 16 | (Dimm index in memory controller)
- * a2-7: not used.
- *
- * Return status:
- * a0: MLXBF_DIMM_INFO defined below describing the DIMM.
- * a1-3: not used.
- */
- #define MLNX_SIP_GET_DIMM_INFO 0x82000008
- /* Format for the SMC response about the memory information */
- #define MLXBF_DIMM_INFO__SIZE_GB GENMASK_ULL(15, 0)
- #define MLXBF_DIMM_INFO__IS_RDIMM BIT(16)
- #define MLXBF_DIMM_INFO__IS_LRDIMM BIT(17)
- #define MLXBF_DIMM_INFO__IS_NVDIMM BIT(18)
- #define MLXBF_DIMM_INFO__RANKS GENMASK_ULL(23, 21)
- #define MLXBF_DIMM_INFO__PACKAGE_X GENMASK_ULL(31, 24)
- struct bluefield_edac_priv {
- int dimm_ranks[MLXBF_EDAC_MAX_DIMM_PER_MC];
- void __iomem *emi_base;
- int dimm_per_mc;
- };
- static u64 smc_call1(u64 smc_op, u64 smc_arg)
- {
- struct arm_smccc_res res;
- arm_smccc_smc(smc_op, smc_arg, 0, 0, 0, 0, 0, 0, &res);
- return res.a0;
- }
- /*
- * Gather the ECC information from the External Memory Interface registers
- * and report it to the edac handler.
- */
- static void bluefield_gather_report_ecc(struct mem_ctl_info *mci,
- int error_cnt,
- int is_single_ecc)
- {
- struct bluefield_edac_priv *priv = mci->pvt_info;
- u32 dram_additional_info, err_prank, edea0, edea1;
- u32 ecc_latch_select, dram_syndrom, serr, derr, syndrom;
- enum hw_event_mc_err_type ecc_type;
- u64 ecc_dimm_addr;
- int ecc_dimm;
- ecc_type = is_single_ecc ? HW_EVENT_ERR_CORRECTED :
- HW_EVENT_ERR_UNCORRECTED;
- /*
- * Tell the External Memory Interface to populate the relevant
- * registers with information about the last ECC error occurrence.
- */
- ecc_latch_select = MLXBF_ECC_LATCH_SEL__START;
- writel(ecc_latch_select, priv->emi_base + MLXBF_ECC_LATCH_SEL);
- /*
- * Verify that the ECC reported info in the registers is of the
- * same type as the one asked to report. If not, just report the
- * error without the detailed information.
- */
- dram_syndrom = readl(priv->emi_base + MLXBF_SYNDROM);
- serr = FIELD_GET(MLXBF_SYNDROM__SERR, dram_syndrom);
- derr = FIELD_GET(MLXBF_SYNDROM__DERR, dram_syndrom);
- syndrom = FIELD_GET(MLXBF_SYNDROM__SYN, dram_syndrom);
- if ((is_single_ecc && !serr) || (!is_single_ecc && !derr)) {
- edac_mc_handle_error(ecc_type, mci, error_cnt, 0, 0, 0,
- 0, 0, -1, mci->ctl_name, "");
- return;
- }
- dram_additional_info = readl(priv->emi_base + MLXBF_ADD_INFO);
- err_prank = FIELD_GET(MLXBF_ADD_INFO__ERR_PRANK, dram_additional_info);
- ecc_dimm = (err_prank >= 2 && priv->dimm_ranks[0] <= 2) ? 1 : 0;
- edea0 = readl(priv->emi_base + MLXBF_ERR_ADDR_0);
- edea1 = readl(priv->emi_base + MLXBF_ERR_ADDR_1);
- ecc_dimm_addr = ((u64)edea1 << 32) | edea0;
- edac_mc_handle_error(ecc_type, mci, error_cnt,
- PFN_DOWN(ecc_dimm_addr),
- offset_in_page(ecc_dimm_addr),
- syndrom, ecc_dimm, 0, 0, mci->ctl_name, "");
- }
- static void bluefield_edac_check(struct mem_ctl_info *mci)
- {
- struct bluefield_edac_priv *priv = mci->pvt_info;
- u32 ecc_count, single_error_count, double_error_count, ecc_error = 0;
- /*
- * The memory controller might not be initialized by the firmware
- * when there isn't memory, which may lead to bad register readings.
- */
- if (mci->edac_cap == EDAC_FLAG_NONE)
- return;
- ecc_count = readl(priv->emi_base + MLXBF_ECC_CNT);
- single_error_count = FIELD_GET(MLXBF_ECC_CNT__SERR_CNT, ecc_count);
- double_error_count = FIELD_GET(MLXBF_ECC_CNT__DERR_CNT, ecc_count);
- if (single_error_count) {
- ecc_error |= MLXBF_ECC_ERR__SECC;
- bluefield_gather_report_ecc(mci, single_error_count, 1);
- }
- if (double_error_count) {
- ecc_error |= MLXBF_ECC_ERR__DECC;
- bluefield_gather_report_ecc(mci, double_error_count, 0);
- }
- /* Write to clear reported errors. */
- if (ecc_count)
- writel(ecc_error, priv->emi_base + MLXBF_ECC_ERR);
- }
- /* Initialize the DIMMs information for the given memory controller. */
- static void bluefield_edac_init_dimms(struct mem_ctl_info *mci)
- {
- struct bluefield_edac_priv *priv = mci->pvt_info;
- int mem_ctrl_idx = mci->mc_idx;
- struct dimm_info *dimm;
- u64 smc_info, smc_arg;
- int is_empty = 1, i;
- for (i = 0; i < priv->dimm_per_mc; i++) {
- dimm = mci->dimms[i];
- smc_arg = mem_ctrl_idx << 16 | i;
- smc_info = smc_call1(MLNX_SIP_GET_DIMM_INFO, smc_arg);
- if (!FIELD_GET(MLXBF_DIMM_INFO__SIZE_GB, smc_info)) {
- dimm->mtype = MEM_EMPTY;
- continue;
- }
- is_empty = 0;
- dimm->edac_mode = EDAC_SECDED;
- if (FIELD_GET(MLXBF_DIMM_INFO__IS_NVDIMM, smc_info))
- dimm->mtype = MEM_NVDIMM;
- else if (FIELD_GET(MLXBF_DIMM_INFO__IS_LRDIMM, smc_info))
- dimm->mtype = MEM_LRDDR4;
- else if (FIELD_GET(MLXBF_DIMM_INFO__IS_RDIMM, smc_info))
- dimm->mtype = MEM_RDDR4;
- else
- dimm->mtype = MEM_DDR4;
- dimm->nr_pages =
- FIELD_GET(MLXBF_DIMM_INFO__SIZE_GB, smc_info) *
- (SZ_1G / PAGE_SIZE);
- dimm->grain = MLXBF_EDAC_ERROR_GRAIN;
- /* Mem controller for BlueField only supports x4, x8 and x16 */
- switch (FIELD_GET(MLXBF_DIMM_INFO__PACKAGE_X, smc_info)) {
- case 4:
- dimm->dtype = DEV_X4;
- break;
- case 8:
- dimm->dtype = DEV_X8;
- break;
- case 16:
- dimm->dtype = DEV_X16;
- break;
- default:
- dimm->dtype = DEV_UNKNOWN;
- }
- priv->dimm_ranks[i] =
- FIELD_GET(MLXBF_DIMM_INFO__RANKS, smc_info);
- }
- if (is_empty)
- mci->edac_cap = EDAC_FLAG_NONE;
- else
- mci->edac_cap = EDAC_FLAG_SECDED;
- }
- static int bluefield_edac_mc_probe(struct platform_device *pdev)
- {
- struct bluefield_edac_priv *priv;
- struct device *dev = &pdev->dev;
- struct edac_mc_layer layers[1];
- struct mem_ctl_info *mci;
- struct resource *emi_res;
- unsigned int mc_idx, dimm_count;
- int rc, ret;
- /* Read the MSS (Memory SubSystem) index from ACPI table. */
- if (device_property_read_u32(dev, "mss_number", &mc_idx)) {
- dev_warn(dev, "bf_edac: MSS number unknown\n");
- return -EINVAL;
- }
- /* Read the DIMMs per MC from ACPI table. */
- if (device_property_read_u32(dev, "dimm_per_mc", &dimm_count)) {
- dev_warn(dev, "bf_edac: DIMMs per MC unknown\n");
- return -EINVAL;
- }
- if (dimm_count > MLXBF_EDAC_MAX_DIMM_PER_MC) {
- dev_warn(dev, "bf_edac: DIMMs per MC not valid\n");
- return -EINVAL;
- }
- emi_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!emi_res)
- return -EINVAL;
- layers[0].type = EDAC_MC_LAYER_SLOT;
- layers[0].size = dimm_count;
- layers[0].is_virt_csrow = true;
- mci = edac_mc_alloc(mc_idx, ARRAY_SIZE(layers), layers, sizeof(*priv));
- if (!mci)
- return -ENOMEM;
- priv = mci->pvt_info;
- priv->dimm_per_mc = dimm_count;
- priv->emi_base = devm_ioremap_resource(dev, emi_res);
- if (IS_ERR(priv->emi_base)) {
- dev_err(dev, "failed to map EMI IO resource\n");
- ret = PTR_ERR(priv->emi_base);
- goto err;
- }
- mci->pdev = dev;
- mci->mtype_cap = MEM_FLAG_DDR4 | MEM_FLAG_RDDR4 |
- MEM_FLAG_LRDDR4 | MEM_FLAG_NVDIMM;
- mci->edac_ctl_cap = EDAC_FLAG_SECDED;
- mci->mod_name = DRIVER_NAME;
- mci->ctl_name = "BlueField_Memory_Controller";
- mci->dev_name = dev_name(dev);
- mci->edac_check = bluefield_edac_check;
- /* Initialize mci with the actual populated DIMM information. */
- bluefield_edac_init_dimms(mci);
- platform_set_drvdata(pdev, mci);
- /* Register with EDAC core */
- rc = edac_mc_add_mc(mci);
- if (rc) {
- dev_err(dev, "failed to register with EDAC core\n");
- ret = rc;
- goto err;
- }
- /* Only POLL mode supported so far. */
- edac_op_state = EDAC_OPSTATE_POLL;
- return 0;
- err:
- edac_mc_free(mci);
- return ret;
- }
- static int bluefield_edac_mc_remove(struct platform_device *pdev)
- {
- struct mem_ctl_info *mci = platform_get_drvdata(pdev);
- edac_mc_del_mc(&pdev->dev);
- edac_mc_free(mci);
- return 0;
- }
- static const struct acpi_device_id bluefield_mc_acpi_ids[] = {
- {"MLNXBF08", 0},
- {}
- };
- MODULE_DEVICE_TABLE(acpi, bluefield_mc_acpi_ids);
- static struct platform_driver bluefield_edac_mc_driver = {
- .driver = {
- .name = DRIVER_NAME,
- .acpi_match_table = bluefield_mc_acpi_ids,
- },
- .probe = bluefield_edac_mc_probe,
- .remove = bluefield_edac_mc_remove,
- };
- module_platform_driver(bluefield_edac_mc_driver);
- MODULE_DESCRIPTION("Mellanox BlueField memory edac driver");
- MODULE_AUTHOR("Mellanox Technologies");
- MODULE_LICENSE("GPL v2");
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