diff options
| -rw-r--r-- | Documentation/devicetree/bindings/cpuss_dump/cpuss_dump.txt | 27 | ||||
| -rw-r--r-- | drivers/soc/qcom/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/soc/qcom/Makefile | 1 | ||||
| -rw-r--r-- | drivers/soc/qcom/cpuss_dump.c | 125 |
4 files changed, 162 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/cpuss_dump/cpuss_dump.txt b/Documentation/devicetree/bindings/cpuss_dump/cpuss_dump.txt new file mode 100644 index 000000000000..e19632a0168b --- /dev/null +++ b/Documentation/devicetree/bindings/cpuss_dump/cpuss_dump.txt @@ -0,0 +1,27 @@ +CPU Subsystem Dump Driver + +The CPU Subsystem dump driver is used to dump various hardware entities +like the instruction and data tlbs or the unified tlbs etc. to an +allocated buffer. This allows the data to be analysed in case of corruption. + +Required Properties for the cpuss_dump node: +-compatible = "qcom,cpuss-dump"; + +All child nodes of cpuss_dump node are interpreted as the various hardware +entities which need to be dumped. + +Required properties of the dump nodes + +- qcom,dump-node: phandle to the acutal cpuss hardware entity present + in the cpu map +- qcom,dump-id: The ID within the data dump table where this entry needs to + be added. + +Example: + msm_cpuss_dump { + compatible = "qcom,cpuss-dump"; + qcom,itlb_dump100 { + qcom,dump-node = <&L1_itlb_100>; + qcom,dump-id = <34>; + }; + }; diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig index 3fa75cc19a4f..1ff46e389dd9 100644 --- a/drivers/soc/qcom/Kconfig +++ b/drivers/soc/qcom/Kconfig @@ -460,6 +460,15 @@ config MSM_BOOT_STATS This figures are reported in mpm sleep clock cycles and have a resolution of 31 bits as 1 bit is used as an overflow check. +config QCOM_CPUSS_DUMP + bool "CPU Subsystem Dumping support" + help + Add support to dump various hardware entities such as the instruction + and data tlb's as well as the unified tlb, which are a part of the + cpu subsystem to an allocated buffer. This allows for analysis of the + the entities if corruption is suspected. + If unsure, say N + config MSM_QDSP6_APRV2 bool "Audio QDSP6 APRv2 support" depends on MSM_SMD diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile index 2cb810465002..8e4a39e6e367 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -50,6 +50,7 @@ endif obj-$(CONFIG_QPNP_HAPTIC) += qpnp-haptic.o obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o +obj-$(CONFIG_QCOM_CPUSS_DUMP) += cpuss_dump.o obj-$(CONFIG_QCOM_PM) += spm.o obj-$(CONFIG_QCOM_SMD) += smd.o obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o diff --git a/drivers/soc/qcom/cpuss_dump.c b/drivers/soc/qcom/cpuss_dump.c new file mode 100644 index 000000000000..93c876a7ad73 --- /dev/null +++ b/drivers/soc/qcom/cpuss_dump.c @@ -0,0 +1,125 @@ +/* Copyright (c) 2014-2016, 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/init.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <soc/qcom/memory_dump.h> + +static int cpuss_dump_probe(struct platform_device *pdev) +{ + struct device_node *child_node, *dump_node; + const struct device_node *node = pdev->dev.of_node; + static dma_addr_t dump_addr; + static void *dump_vaddr; + struct msm_dump_data *dump_data; + struct msm_dump_entry dump_entry; + int ret; + u32 size, id; + + for_each_available_child_of_node(node, child_node) { + dump_node = of_parse_phandle(child_node, "qcom,dump-node", 0); + + if (!dump_node) { + dev_err(&pdev->dev, "Unable to find node for %s\n", + child_node->name); + continue; + } + + ret = of_property_read_u32(dump_node, "qcom,dump-size", &size); + if (ret) { + dev_err(&pdev->dev, "Unable to find size for %s\n", + dump_node->name); + continue; + } + + ret = of_property_read_u32(child_node, "qcom,dump-id", &id); + if (ret) { + dev_err(&pdev->dev, "Unable to find id for %s\n", + child_node->name); + continue; + } + + dump_vaddr = (void *) dma_alloc_coherent(&pdev->dev, size, + &dump_addr, GFP_KERNEL); + + if (!dump_vaddr) { + dev_err(&pdev->dev, "Couldn't get memory for dumping\n"); + continue; + } + + memset(dump_vaddr, 0x0, size); + + dump_data = devm_kzalloc(&pdev->dev, + sizeof(struct msm_dump_data), GFP_KERNEL); + if (!dump_data) { + dev_err(&pdev->dev, "Dump data allocation failed\n"); + dma_free_coherent(&pdev->dev, size, dump_vaddr, + dump_addr); + continue; + } + + dump_data->addr = dump_addr; + dump_data->len = size; + dump_entry.id = id; + dump_entry.addr = virt_to_phys(dump_data); + ret = msm_dump_data_register(MSM_DUMP_TABLE_APPS, &dump_entry); + if (ret) { + dev_err(&pdev->dev, "Data dump setup failed, id = %d\n", + id); + dma_free_coherent(&pdev->dev, size, dump_vaddr, + dump_addr); + devm_kfree(&pdev->dev, dump_data); + } + + } + return 0; +} + +static int cpuss_dump_remove(struct platform_device *pdev) +{ + return 0; +} + +static const struct of_device_id cpuss_dump_match_table[] = { + { .compatible = "qcom,cpuss-dump", }, + {} +}; + +static struct platform_driver cpuss_dump_driver = { + .probe = cpuss_dump_probe, + .remove = cpuss_dump_remove, + .driver = { + .name = "msm_cpuss_dump", + .owner = THIS_MODULE, + .of_match_table = cpuss_dump_match_table, + }, +}; + +static int __init cpuss_dump_init(void) +{ + return platform_driver_register(&cpuss_dump_driver); +} + +static void __exit cpuss_dump_exit(void) +{ + platform_driver_unregister(&cpuss_dump_driver); +} + +subsys_initcall(cpuss_dump_init); +module_exit(cpuss_dump_exit) + |