From patchwork Mon Nov 7 09:02:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shravan Ramani X-Patchwork-Id: 13034149 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB96AC4332F for ; Mon, 7 Nov 2022 09:10:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231610AbiKGJKN (ORCPT ); Mon, 7 Nov 2022 04:10:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37922 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231594AbiKGJKK (ORCPT ); Mon, 7 Nov 2022 04:10:10 -0500 Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7B5AA167F8 for ; Mon, 7 Nov 2022 01:10:04 -0800 (PST) Received: from Internal Mail-Server by MTLPINE1 (envelope-from shravankr@mellanox.com) with SMTP; 7 Nov 2022 11:03:19 +0200 Received: from bu-vnc02.mtbu.labs.mlnx (bu-vnc02.mtbu.labs.mlnx [10.15.2.65]) by mtbu-labmailer.labs.mlnx (8.14.4/8.14.4) with ESMTP id 2A793IDL028157; Mon, 7 Nov 2022 04:03:18 -0500 Received: (from shravankr@localhost) by bu-vnc02.mtbu.labs.mlnx (8.14.7/8.13.8/Submit) id 2A793Ihd008352; Mon, 7 Nov 2022 04:03:18 -0500 From: Shravan Kumar Ramani To: James Morse Cc: Shravan Kumar Ramani , linux-edac@vger.kernel.org Subject: [PATCH v1 1/2] EDAC/bluefield_edac: Add SMC support Date: Mon, 7 Nov 2022 04:02:53 -0500 Message-Id: X-Mailer: git-send-email 2.30.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org Add secure read/write calls to bluefield_edac. The ACPI table entry decides whether the secure calls need to be used for accessing the EMI registers. Signed-off-by: Shravan Kumar Ramani --- drivers/edac/bluefield_edac.c | 176 ++++++++++++++++++++++++++++++---- 1 file changed, 156 insertions(+), 20 deletions(-) diff --git a/drivers/edac/bluefield_edac.c b/drivers/edac/bluefield_edac.c index e4736eb37bfb..cb9e42ef64d1 100644 --- a/drivers/edac/bluefield_edac.c +++ b/drivers/edac/bluefield_edac.c @@ -47,13 +47,25 @@ #define MLXBF_EDAC_MAX_DIMM_PER_MC 2 #define MLXBF_EDAC_ERROR_GRAIN 8 +#define MLXBF_WRITE_REG_32 (0x82000009) +#define MLXBF_READ_REG_32 (0x8200000A) +#define MLXBF_WRITE_REG_64 (0x8200000B) +#define MLXBF_READ_REG_64 (0x8200000C) +#define MLXBF_SIP_SVC_UID (0x8200ff01) +#define MLXBF_SIP_SVC_VERSION (0x8200ff03) + +#define MLXBF_SMCCC_ACCESS_VIOLATION (-4) + +#define MLXBF_SVC_REQ_MAJOR 0 +#define MLXBF_SVC_REQ_MINOR 3 + /* - * Request MLNX_SIP_GET_DIMM_INFO + * Request MLXBF_SIP_GET_DIMM_INFO * * Retrieve information about DIMM on a certain slot. * * Call register usage: - * a0: MLNX_SIP_GET_DIMM_INFO + * a0: MLXBF_SIP_GET_DIMM_INFO * a1: (Memory controller index) << 16 | (Dimm index in memory controller) * a2-7: not used. * @@ -61,7 +73,7 @@ * a0: MLXBF_DIMM_INFO defined below describing the DIMM. * a1-3: not used. */ -#define MLNX_SIP_GET_DIMM_INFO 0x82000008 +#define MLXBF_SIP_GET_DIMM_INFO 0x82000008 /* Format for the SMC response about the memory information */ #define MLXBF_DIMM_INFO__SIZE_GB GENMASK_ULL(15, 0) @@ -72,9 +84,12 @@ #define MLXBF_DIMM_INFO__PACKAGE_X GENMASK_ULL(31, 24) struct bluefield_edac_priv { + struct device *dev; int dimm_ranks[MLXBF_EDAC_MAX_DIMM_PER_MC]; void __iomem *emi_base; int dimm_per_mc; + bool svc_sreg_support; + u32 sreg_tbl_edac; }; static u64 smc_call1(u64 smc_op, u64 smc_arg) @@ -86,6 +101,71 @@ static u64 smc_call1(u64 smc_op, u64 smc_arg) return res.a0; } +static int secure_readl(void __iomem *addr, uint32_t *result, uint32_t sreg_tbl) +{ + struct arm_smccc_res res; + int status; + + arm_smccc_smc(MLXBF_READ_REG_32, sreg_tbl, (uintptr_t)addr, + 0, 0, 0, 0, 0, &res); + + status = res.a0; + + switch (status) { + case SMCCC_RET_NOT_SUPPORTED: + case MLXBF_SMCCC_ACCESS_VIOLATION: + return -1; + default: + *result = (uint32_t)res.a1; + return 0; + } +} + +static int secure_writel(void __iomem *addr, uint32_t data, uint32_t sreg_tbl) +{ + struct arm_smccc_res res; + int status; + + arm_smccc_smc(MLXBF_WRITE_REG_32, sreg_tbl, data, (uintptr_t)addr, + 0, 0, 0, 0, &res); + + status = res.a0; + + switch (status) { + case SMCCC_RET_NOT_SUPPORTED: + case MLXBF_SMCCC_ACCESS_VIOLATION: + return -1; + default: + return 0; + } +} + +static int edac_readl(void __iomem *addr, uint32_t *result, + bool sreg_support, uint32_t sreg_tbl) +{ + int err = 0; + + if (sreg_support) + err = secure_readl(addr, result, sreg_tbl); + else + *result = readl(addr); + + return err; +} + +static int edac_writel(void __iomem *addr, uint32_t data, + bool sreg_support, uint32_t sreg_tbl) +{ + int err = 0; + + if (sreg_support) + err = secure_writel(addr, data, sreg_tbl); + else + writel(data, addr); + + return err; +} + /* * Gather the ECC information from the External Memory Interface registers * and report it to the edac handler. @@ -99,7 +179,7 @@ static void bluefield_gather_report_ecc(struct mem_ctl_info *mci, u32 ecc_latch_select, dram_syndrom, serr, derr, syndrom; enum hw_event_mc_err_type ecc_type; u64 ecc_dimm_addr; - int ecc_dimm; + int ecc_dimm, err; ecc_type = is_single_ecc ? HW_EVENT_ERR_CORRECTED : HW_EVENT_ERR_UNCORRECTED; @@ -109,14 +189,22 @@ static void bluefield_gather_report_ecc(struct mem_ctl_info *mci, * 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); + err = edac_writel(priv->emi_base + MLXBF_ECC_LATCH_SEL, + ecc_latch_select, priv->svc_sreg_support, + priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "ECC latch select write failed.\n"); /* * 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); + err = edac_readl(priv->emi_base + MLXBF_SYNDROM, &dram_syndrom, + priv->svc_sreg_support, priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "DRAM syndrom read failed.\n"); + serr = FIELD_GET(MLXBF_SYNDROM__SERR, dram_syndrom); derr = FIELD_GET(MLXBF_SYNDROM__DERR, dram_syndrom); syndrom = FIELD_GET(MLXBF_SYNDROM__SYN, dram_syndrom); @@ -127,13 +215,24 @@ static void bluefield_gather_report_ecc(struct mem_ctl_info *mci, return; } - dram_additional_info = readl(priv->emi_base + MLXBF_ADD_INFO); + err = edac_readl(priv->emi_base + MLXBF_ADD_INFO, &dram_additional_info, + priv->svc_sreg_support, priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "DRAM additional info read failed.\n"); + 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); + err = edac_readl(priv->emi_base + MLXBF_ERR_ADDR_0, &edea0, + priv->svc_sreg_support, priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "Error addr 0 read failed.\n"); + + err = edac_readl(priv->emi_base + MLXBF_ERR_ADDR_1, &edea1, + priv->svc_sreg_support, priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "Error addr 1 read failed.\n"); ecc_dimm_addr = ((u64)edea1 << 32) | edea0; @@ -147,6 +246,7 @@ 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; + int err; /* * The memory controller might not be initialized by the firmware @@ -155,7 +255,11 @@ static void bluefield_edac_check(struct mem_ctl_info *mci) if (mci->edac_cap == EDAC_FLAG_NONE) return; - ecc_count = readl(priv->emi_base + MLXBF_ECC_CNT); + err = edac_readl(priv->emi_base + MLXBF_ECC_CNT, &ecc_count, + priv->svc_sreg_support, priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "ECC count read failed.\n"); + single_error_count = FIELD_GET(MLXBF_ECC_CNT__SERR_CNT, ecc_count); double_error_count = FIELD_GET(MLXBF_ECC_CNT__DERR_CNT, ecc_count); @@ -172,15 +276,19 @@ static void bluefield_edac_check(struct mem_ctl_info *mci) } /* Write to clear reported errors. */ - if (ecc_count) - writel(ecc_error, priv->emi_base + MLXBF_ECC_ERR); + if (ecc_count) { + err = edac_writel(priv->emi_base + MLXBF_ECC_ERR, ecc_error, + priv->svc_sreg_support, priv->sreg_tbl_edac); + if (err) + dev_err(priv->dev, "ECC Error write failed.\n"); + } } /* 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; + u64 mem_ctrl_idx = mci->mc_idx; struct dimm_info *dimm; u64 smc_info, smc_arg; int is_empty = 1, i; @@ -189,7 +297,7 @@ static void bluefield_edac_init_dimms(struct mem_ctl_info *mci) dimm = mci->dimms[i]; smc_arg = mem_ctrl_idx << 16 | i; - smc_info = smc_call1(MLNX_SIP_GET_DIMM_INFO, smc_arg); + smc_info = smc_call1(MLXBF_SIP_GET_DIMM_INFO, smc_arg); if (!FIELD_GET(MLXBF_DIMM_INFO__SIZE_GB, smc_info)) { dimm->mtype = MEM_EMPTY; @@ -244,6 +352,7 @@ 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 arm_smccc_res res; struct mem_ctl_info *mci; struct resource *emi_res; unsigned int mc_idx, dimm_count; @@ -280,12 +389,40 @@ static int bluefield_edac_mc_probe(struct platform_device *pdev) priv = mci->pvt_info; + /* + * ACPI indicates whether we use SMCs to access registers or not. + * If sreg_tbl_perf is not present, just assume we're not using SMCs. + */ + if (device_property_read_u32(dev, + "sec_reg_block", &priv->sreg_tbl_edac)) { + priv->svc_sreg_support = false; + } else { + /* + * Check service version to see if we actually do support the + * needed SMCs. If we have the calls we need, mark support for + * them in the pmc struct. + */ + arm_smccc_smc(MLXBF_SIP_SVC_VERSION, 0, 0, 0, 0, 0, 0, 0, &res); + if (res.a0 == MLXBF_SVC_REQ_MAJOR && + res.a1 >= MLXBF_SVC_REQ_MINOR) { + priv->svc_sreg_support = true; + } else { + dev_err(dev, "Required SMCs are not supported.\n"); + ret = -EINVAL; + goto err; + } + } + 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; + if (!priv->svc_sreg_support) { + 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; + } + } else { + priv->emi_base = (void __iomem *)emi_res->start; } mci->pdev = dev; @@ -320,7 +457,6 @@ static int bluefield_edac_mc_probe(struct platform_device *pdev) edac_mc_free(mci); return ret; - } static int bluefield_edac_mc_remove(struct platform_device *pdev)