--- /dev/null
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/cpu_pm.h>
+#include <linux/platform_device.h>
+#include <soc/qcom/scm.h>
+
+#define MODULE_NAME "gladiator_error_reporting"
+
+/* SCM call service and command ID */
+#define SCM_TZ_SVC_INFO 0x6
+#define TZ_INFO_GET_SECURE_STATE 0x4
+
+/* Secure State Check */
+#define SEC_STATE_VALID(a) (a & (BIT(0) | BIT(2) | BIT(6)))
+
+/* Register Offsets */
+#define GLADIATOR_ID_COREID 0x0
+#define GLADIATOR_ID_REVISIONID 0x4
+#define GLADIATOR_FAULTEN 0x48
+#define GLADIATOR_ERRVLD 0x4C
+#define GLADIATOR_ERRCLR 0x50
+#define GLADIATOR_ERRLOG0 0x54
+#define GLADIATOR_ERRLOG1 0x58
+#define GLADIATOR_ERRLOG2 0x5C
+#define GLADIATOR_ERRLOG3 0x60
+#define GLADIATOR_ERRLOG4 0x64
+#define GLADIATOR_ERRLOG5 0x68
+#define GLADIATOR_ERRLOG6 0x6C
+#define GLADIATOR_ERRLOG7 0x70 /* Not used for error reporting */
+#define GLADIATOR_ERRLOG8 0x74
+#define OBSERVER_0_ID_COREID 0x1000
+#define OBSERVER_0_FAULTEN 0x1008
+#define OBSERVER_0_ERRVLD 0x100C
+#define OBSERVER_0_ERRCLR 0x1010
+#define OBSERVER_0_ERRLOG0 0x1014
+#define OBSERVER_0_ERRLOG1 0x1018
+#define OBSERVER_0_ERRLOG2 0x101C /* Not used for error reporting */
+#define OBSERVER_0_ERRLOG3 0x1020
+#define OBSERVER_0_ERRLOG4 0x1024
+#define OBSERVER_0_ERRLOG5 0x1028
+#define OBSERVER_0_ERRLOG6 0x102C /* Not used for error reporting */
+#define OBSERVER_0_ERRLOG7 0x1030
+#define OBSERVER_0_ERRLOG8 0x1034 /* Not used for error reporting */
+#define OBSERVER_0_STALLEN 0x1038
+#define OBSERVER_0_REVISIONID 0x1004
+
+#define GLD_TRANS_OPCODE_MASK 0xE
+#define GLD_TRANS_OPCODE_SHIFT 1
+#define GLD_ERROR_TYPE_MASK 0x700
+#define GLD_ERROR_TYPE_SHIFT 8
+#define GLD_LEN1_MASK 0x7FF8000
+#define GLD_LEN1_SHIFT 16
+#define GLD_TRANS_SOURCEID_MASK 0x7
+#define GLD_TRANS_SOURCEID_SHIFT 0
+#define GLD_TRANS_TARGETID_MASK 0x7
+#define GLD_TRANS_TARGETID_SHIFT 0
+#define GLD_ERRLOG_ERROR 0x7
+#define OBS_TRANS_OPCODE_MASK 0x1E
+#define OBS_TRANS_OPCODE_SHIFT 1
+#define OBS_ERROR_TYPE_MASK 0x700
+#define OBS_ERROR_TYPE_SHIFT 8
+#define OBS_LEN1_MASK 0x7F0000
+#define OBS_LEN1_SHIFT 16
+
+struct msm_gladiator_data {
+ void __iomem *gladiator_virt_base;
+ int erp_irq;
+ struct notifier_block pm_notifier_block;
+};
+
+static int enable_panic_on_error;
+module_param(enable_panic_on_error, int, 0);
+
+enum gld_trans_opcode {
+ GLD_RD,
+ GLD_RDX,
+ GLD_RDL,
+ GLD_RESERVED,
+ GLD_WR,
+ GLD_WRC,
+ GLD_PRE,
+};
+
+enum obs_trans_opcode {
+ OBS_RD,
+ OBS_RDW,
+ OBS_RDL,
+ OBS_RDX,
+ OBS_WR,
+ OBS_WRW,
+ OBS_WRC,
+ OBS_RESERVED,
+ OBS_PRE,
+ OBS_URG,
+};
+
+enum obs_err_code {
+ OBS_SLV,
+ OBS_DEC,
+ OBS_UNS,
+ OBS_DISC,
+ OBS_SEC,
+ OBS_HIDE,
+ OBS_TMO,
+ OBS_RSV,
+};
+
+enum err_log {
+ ERR_LOG0,
+ ERR_LOG1,
+ ERR_LOG2,
+ ERR_LOG3,
+ ERR_LOG4,
+ ERR_LOG5,
+ ERR_LOG6,
+ ERR_LOG7,
+ ERR_LOG8,
+ STALLEN,
+};
+
+static void clear_gladiator_error(void __iomem *gladiator_virt_base)
+{
+ writel_relaxed(1, gladiator_virt_base + GLADIATOR_ERRCLR);
+ writel_relaxed(1, gladiator_virt_base + OBSERVER_0_ERRCLR);
+}
+
+static inline void print_gld_transaction(unsigned int opc)
+{
+ switch (opc) {
+ case GLD_RD:
+ pr_alert("Transaction type: READ\n");
+ break;
+ case GLD_RDX:
+ pr_alert("Transaction type: EXCLUSIVE READ\n");
+ break;
+ case GLD_RDL:
+ pr_alert("Transaction type: LINKED READ\n");
+ break;
+ case GLD_WR:
+ pr_alert("Transaction type: WRITE\n");
+ break;
+ case GLD_WRC:
+ pr_alert("Transaction type: CONDITIONAL WRITE\n");
+ break;
+ case GLD_PRE:
+ pr_alert("Transaction: Preamble packet of linked sequence\n");
+ break;
+ default:
+ pr_alert("Transaction type: Unknown; value:%u\n", opc);
+ }
+}
+
+static inline void print_gld_errtype(unsigned int errtype)
+{
+ if (errtype == 0)
+ pr_alert("Error type: Snoop data transfer\n");
+ else if (errtype == 1)
+ pr_alert("Error type: DVM error\n");
+ else
+ pr_alert("Error type: Unknown; value:%u\n", errtype);
+}
+
+static void decode_gld_errlog0(u32 err_reg)
+{
+ unsigned int opc, errtype, len1;
+
+ opc = (err_reg & GLD_TRANS_OPCODE_MASK) >> GLD_TRANS_OPCODE_SHIFT;
+ errtype = (err_reg & GLD_ERROR_TYPE_MASK) >> GLD_ERROR_TYPE_SHIFT;
+ len1 = (err_reg & GLD_LEN1_MASK) >> GLD_LEN1_SHIFT;
+
+ print_gld_transaction(opc);
+ print_gld_errtype(errtype);
+ pr_alert("number of payload bytes: %d\n", len1 + 1);
+}
+
+static void decode_gld_errlog1(u32 err_reg)
+{
+ if ((err_reg & GLD_ERRLOG_ERROR) == GLD_ERRLOG_ERROR)
+ pr_alert("Transaction issued on IO target generic interface\n");
+ else
+ pr_alert("Transaction source ID: %d\n",
+ (err_reg & GLD_TRANS_SOURCEID_MASK)
+ >> GLD_TRANS_SOURCEID_SHIFT);
+}
+
+static void decode_gld_errlog2(u32 err_reg)
+{
+ if ((err_reg & GLD_ERRLOG_ERROR) == GLD_ERRLOG_ERROR)
+ pr_alert("Error response coming from: external DVM network\n");
+ else
+ pr_alert("Error response coming from: Target ID: %d\n",
+ (err_reg & GLD_TRANS_TARGETID_MASK)
+ >> GLD_TRANS_TARGETID_SHIFT);
+}
+
+static void decode_gld_errlog(u32 err_reg, unsigned int err_log)
+{
+ switch (err_log) {
+ case ERR_LOG0:
+ decode_gld_errlog0(err_reg);
+ break;
+ case ERR_LOG1:
+ decode_gld_errlog1(err_reg);
+ break;
+ case ERR_LOG2:
+ decode_gld_errlog2(err_reg);
+ break;
+ case ERR_LOG3:
+ pr_alert("Lower 32-bits of error address: %08x\n", err_reg);
+ break;
+ case ERR_LOG4:
+ pr_alert("Upper 32-bits of error address: %08x\n", err_reg);
+ break;
+ case ERR_LOG5:
+ pr_alert("Lower 32-bits of user: %08x\n", err_reg);
+ break;
+ case ERR_LOG6:
+ pr_alert("Mid 32-bits(63-32) of user: %08x\n", err_reg);
+ break;
+ case ERR_LOG7:
+ break;
+ case ERR_LOG8:
+ pr_alert("Upper 32-bits(95-64) of user: %08x\n", err_reg);
+ break;
+ default:
+ pr_alert("Invalid error register; reg num:%u\n", err_log);
+ }
+}
+
+static inline void print_obs_transaction(unsigned int opc)
+{
+ switch (opc) {
+ case OBS_RD:
+ pr_alert("Transaction type: READ\n");
+ break;
+ case OBS_RDW:
+ pr_alert("Transaction type: WRAPPED READ\n");
+ break;
+ case OBS_RDL:
+ pr_alert("Transaction type: LINKED READ\n");
+ break;
+ case OBS_RDX:
+ pr_alert("Transaction type: EXCLUSIVE READ\n");
+ break;
+ case OBS_WR:
+ pr_alert("Transaction type: WRITE\n");
+ break;
+ case OBS_WRW:
+ pr_alert("Transaction type: WRAPPED WRITE\n");
+ break;
+ case OBS_WRC:
+ pr_alert("Transaction type: CONDITIONAL WRITE\n");
+ break;
+ case OBS_PRE:
+ pr_alert("Transaction: Preamble packet of linked sequence\n");
+ break;
+ case OBS_URG:
+ pr_alert("Transaction type: Urgency Packet\n");
+ break;
+ default:
+ pr_alert("Transaction type: Unknown; value:%u\n", opc);
+ }
+}
+
+static inline void print_obs_errcode(unsigned int errcode)
+{
+ switch (errcode) {
+ case OBS_SLV:
+ pr_alert("Error code: Target error detected by slave\n");
+ pr_alert("Source: Target\n");
+ break;
+ case OBS_DEC:
+ pr_alert("Error code: Address decode error\n");
+ pr_alert("Source: Initiator NIU\n");
+ break;
+ case OBS_UNS:
+ pr_alert("Error code: Unsupported request\n");
+ pr_alert("Source: Target NIU\n");
+ break;
+ case OBS_DISC:
+ pr_alert("Error code: Disconnected target or domain\n");
+ pr_alert("Source: Power Disconnect\n");
+ break;
+ case OBS_SEC:
+ pr_alert("Error code: Security violation\n");
+ pr_alert("Source: Initiator NIU or Firewall\n");
+ break;
+ case OBS_HIDE:
+ pr_alert("Error :Hidden security violation, reported as OK\n");
+ pr_alert("Source: Firewall\n");
+ break;
+ case OBS_TMO:
+ pr_alert("Error code: Time-out\n");
+ pr_alert("Source: Target NIU\n");
+ break;
+ default:
+ pr_alert("Error code: Unknown; code:%u\n", errcode);
+ }
+}
+
+static void decode_obs_errlog0(u32 err_reg)
+{
+ unsigned int opc, errcode, len1;
+
+ opc = (err_reg & OBS_TRANS_OPCODE_MASK) >> OBS_TRANS_OPCODE_SHIFT;
+ errcode = (err_reg & OBS_ERROR_TYPE_MASK) >> OBS_ERROR_TYPE_SHIFT;
+ len1 = (err_reg & OBS_LEN1_MASK) >> OBS_LEN1_SHIFT;
+
+ print_obs_transaction(opc);
+ print_obs_errcode(errcode);
+ pr_alert("number of payload bytes: %d\n", len1 + 1);
+}
+
+static void decode_obs_errlog(u32 err_reg, unsigned int err_log)
+{
+ switch (err_log) {
+ case ERR_LOG0:
+ decode_obs_errlog0(err_reg);
+ break;
+ case ERR_LOG1:
+ pr_alert("RouteId of the error: %08x\n", err_reg);
+ break;
+ case ERR_LOG2:
+ /* reserved error log register */
+ break;
+ case ERR_LOG3:
+ pr_alert("Lower 32-bits of error address: %08x\n", err_reg);
+ break;
+ case ERR_LOG4:
+ pr_alert("Upper 12-bits of error address: %08x\n", err_reg);
+ break;
+ case ERR_LOG5:
+ pr_alert("Lower 13-bits of user: %08x\n", err_reg);
+ break;
+ case ERR_LOG6:
+ /* reserved error log register */
+ break;
+ case ERR_LOG7:
+ pr_alert("Security filed of the logged error: %08x\n", err_reg);
+ break;
+ case ERR_LOG8:
+ /* reserved error log register */
+ break;
+ case STALLEN:
+ pr_alert("stall mode of the error logger: %08x\n",
+ err_reg & 0x1);
+ break;
+ default:
+ pr_alert("Invalid error register; reg num:%u\n", err_log);
+ }
+}
+
+static u32 get_gld_offset(unsigned int err_log)
+{
+ u32 offset = 0;
+
+ switch (err_log) {
+ case ERR_LOG0:
+ offset = GLADIATOR_ERRLOG0;
+ break;
+ case ERR_LOG1:
+ offset = GLADIATOR_ERRLOG1;
+ break;
+ case ERR_LOG2:
+ offset = GLADIATOR_ERRLOG2;
+ break;
+ case ERR_LOG3:
+ offset = GLADIATOR_ERRLOG3;
+ break;
+ case ERR_LOG4:
+ offset = GLADIATOR_ERRLOG4;
+ break;
+ case ERR_LOG5:
+ offset = GLADIATOR_ERRLOG5;
+ break;
+ case ERR_LOG6:
+ offset = GLADIATOR_ERRLOG6;
+ break;
+ case ERR_LOG7:
+ offset = GLADIATOR_ERRLOG7;
+ break;
+ case ERR_LOG8:
+ offset = GLADIATOR_ERRLOG8;
+ break;
+ default:
+ pr_alert("Invalid gladiator error register; reg num:%u\n",
+ err_log);
+ }
+ return offset;
+}
+
+static u32 get_obs_offset(unsigned int err_log)
+{
+ u32 offset = 0;
+
+ switch (err_log) {
+ case ERR_LOG0:
+ offset = OBSERVER_0_ERRLOG0;
+ break;
+ case ERR_LOG1:
+ offset = OBSERVER_0_ERRLOG1;
+ break;
+ case ERR_LOG2:
+ offset = OBSERVER_0_ERRLOG2;
+ break;
+ case ERR_LOG3:
+ offset = OBSERVER_0_ERRLOG3;
+ break;
+ case ERR_LOG4:
+ offset = OBSERVER_0_ERRLOG4;
+ break;
+ case ERR_LOG5:
+ offset = OBSERVER_0_ERRLOG5;
+ break;
+ case ERR_LOG6:
+ offset = OBSERVER_0_ERRLOG6;
+ break;
+ case ERR_LOG7:
+ offset = OBSERVER_0_ERRLOG7;
+ break;
+ case ERR_LOG8:
+ offset = OBSERVER_0_ERRLOG8;
+ break;
+ case STALLEN:
+ offset = OBSERVER_0_STALLEN;
+ break;
+ default:
+ pr_alert("Invalid observer error register; reg num:%u\n",
+ err_log);
+ }
+ return offset;
+}
+
+static irqreturn_t msm_gladiator_isr(int irq, void *dev_id)
+{
+ u32 err_reg;
+ unsigned int err_log;
+ struct msm_gladiator_data *msm_gld_data = dev_id;
+ /* Check validity */
+ bool gld_err_valid = readl_relaxed(msm_gld_data->gladiator_virt_base +
+ GLADIATOR_ERRVLD);
+ bool obsrv_err_valid = readl_relaxed(msm_gld_data->gladiator_virt_base +
+ OBSERVER_0_ERRVLD);
+ if (!gld_err_valid && !obsrv_err_valid) {
+ pr_err("%s Invalid Gladiator error reported, clear it\n",
+ __func__);
+ /* Clear IRQ */
+ clear_gladiator_error(msm_gld_data->gladiator_virt_base);
+ return IRQ_HANDLED;
+ }
+ pr_alert("GLADIATOR ERROR DETECTED\n");
+ pr_alert("GLADIATOR error log register data:\n");
+ for (err_log = ERR_LOG0; err_log <= ERR_LOG8; err_log++) {
+ /* skip log register 7 as its reserved */
+ if (err_log == ERR_LOG7)
+ continue;
+ err_reg = readl_relaxed(msm_gld_data->gladiator_virt_base +
+ get_gld_offset(err_log));
+ decode_gld_errlog(err_reg, err_log);
+ }
+ pr_alert("Observor error log register data:\n");
+ for (err_log = ERR_LOG0; err_log <= STALLEN; err_log++) {
+ /* skip log register 2, 6 and 8 as they are reserved */
+ if ((err_log == ERR_LOG2) || (err_log == ERR_LOG6)
+ || (err_log == ERR_LOG8))
+ continue;
+ err_reg = readl_relaxed(msm_gld_data->gladiator_virt_base +
+ get_obs_offset(err_log));
+ decode_obs_errlog(err_reg, err_log);
+ }
+ /* Clear IRQ */
+ clear_gladiator_error(msm_gld_data->gladiator_virt_base);
+ if (enable_panic_on_error)
+ BUG_ON(1);
+ else
+ WARN(1, "Gladiator Cache Interconnect Error Detected\n");
+
+ return IRQ_HANDLED;
+}
+
+static const struct of_device_id gladiator_erp_match_table[] = {
+ { .compatible = "qcom,msm-gladiator" },
+ {},
+};
+
+static int parse_dt_node(struct platform_device *pdev,
+ struct msm_gladiator_data *msm_gld_data)
+{
+ int ret = 0;
+ struct resource *res;
+
+ res = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, "gladiator_base");
+ if (!res)
+ return -ENODEV;
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res),
+ "msm-gladiator-erp")) {
+
+ dev_err(&pdev->dev, "%s cannot reserve gladiator erp region\n",
+ __func__);
+ return -ENXIO;
+ }
+ msm_gld_data->gladiator_virt_base = devm_ioremap(&pdev->dev,
+ res->start, resource_size(res));
+ if (!msm_gld_data->gladiator_virt_base) {
+ dev_err(&pdev->dev, "%s cannot map gladiator register space\n",
+ __func__);
+ return -ENXIO;
+ }
+ msm_gld_data->erp_irq = platform_get_irq(pdev, 0);
+ if (!msm_gld_data->erp_irq)
+ return -ENODEV;
+
+ /* clear existing errors before enabling the interrupt */
+ clear_gladiator_error(msm_gld_data->gladiator_virt_base);
+ ret = devm_request_irq(&pdev->dev, msm_gld_data->erp_irq,
+ msm_gladiator_isr, IRQF_TRIGGER_HIGH,
+ "gladiator-error", msm_gld_data);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to register irq handler\n");
+
+ return ret;
+}
+
+static inline void gladiator_irq_init(void __iomem *gladiator_virt_base)
+{
+ writel_relaxed(1, gladiator_virt_base + GLADIATOR_FAULTEN);
+ writel_relaxed(1, gladiator_virt_base + OBSERVER_0_FAULTEN);
+}
+
+#define CCI_LEVEL 2
+static int gladiator_erp_pm_callback(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ unsigned int level = (unsigned long) data;
+ struct msm_gladiator_data *msm_gld_data = container_of(nb,
+ struct msm_gladiator_data, pm_notifier_block);
+
+ if (level != CCI_LEVEL)
+ return NOTIFY_DONE;
+
+ switch (val) {
+ case CPU_CLUSTER_PM_EXIT:
+ gladiator_irq_init(msm_gld_data->gladiator_virt_base);
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static int gladiator_erp_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct msm_gladiator_data *msm_gld_data;
+
+ msm_gld_data = devm_kzalloc(&pdev->dev,
+ sizeof(struct msm_gladiator_data), GFP_KERNEL);
+ if (!msm_gld_data) {
+ ret = -ENOMEM;
+ goto bail;
+ }
+
+ ret = parse_dt_node(pdev, msm_gld_data);
+ if (ret)
+ goto free_data;
+ msm_gld_data->pm_notifier_block.notifier_call =
+ gladiator_erp_pm_callback;
+ gladiator_irq_init(msm_gld_data->gladiator_virt_base);
+ platform_set_drvdata(pdev, msm_gld_data);
+ cpu_pm_register_notifier(&msm_gld_data->pm_notifier_block);
+#ifdef CONFIG_PANIC_ON_GLADIATOR_ERROR
+ enable_panic_on_error = 1;
+#endif
+ dev_info(&pdev->dev, "MSM Gladiator Error Reporting Initialized\n");
+ return 0;
+
+free_data:
+ devm_kfree(&pdev->dev, msm_gld_data);
+bail:
+ dev_err(&pdev->dev, "Probe failed bailing out\n");
+ return ret;
+}
+
+static int scm_is_gladiator_erp_available(void)
+{
+ int ret;
+ struct scm_desc desc = {0};
+
+ desc.args[0] = 0;
+ desc.arginfo = 0;
+ ret = scm_call2(SCM_SIP_FNID(SCM_TZ_SVC_INFO,
+ TZ_INFO_GET_SECURE_STATE),
+ &desc);
+ if (ret) {
+ pr_err("gladiator_error_reporting: SCM call failed\n");
+ return -ENODEV;
+ }
+
+ if (SEC_STATE_VALID(desc.ret[0]))
+ return 0;
+ else
+ return -ENODEV;
+}
+
+static struct platform_driver gladiator_erp_driver = {
+ .probe = gladiator_erp_probe,
+ .driver = {
+ .name = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = gladiator_erp_match_table,
+ },
+};
+
+static int init_gladiator_erp(void)
+{
+ int ret;
+
+ ret = scm_is_gladiator_erp_available();
+ if (ret) {
+ pr_info("Gladiator Error Reporting not available\n");
+ return -ENODEV;
+ }
+
+ return platform_driver_register(&gladiator_erp_driver);
+}
+
+subsys_initcall(init_gladiator_erp);
+MODULE_DESCRIPTION("Gladiator Error Reporting");
+MODULE_LICENSE("GPL v2");
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