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![Siddharth Gupta](/assets/img/avatar_default.png)
This patch adds support for collecting minidump in the event of remoteproc crash. Parse the minidump table based on remoteproc's unique minidump-id, read all memory regions from the remoteproc's minidump table entry and expose the memory to userspace. The remoteproc platform driver can choose to collect a full/mini dump by specifying the coredump op. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Co-developed-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Co-developed-by: Gurbir Arora <gurbaror@codeaurora.org> Signed-off-by: Gurbir Arora <gurbaror@codeaurora.org> Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org> Link: https://lore.kernel.org/r/1605819935-10726-4-git-send-email-sidgup@codeaurora.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
509 lines
14 KiB
C
509 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Qualcomm Peripheral Image Loader helpers
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*
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* Copyright (C) 2016 Linaro Ltd
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* Copyright (C) 2015 Sony Mobile Communications Inc
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*/
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#include <linux/firmware.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/remoteproc.h>
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#include <linux/remoteproc/qcom_rproc.h>
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#include <linux/rpmsg/qcom_glink.h>
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#include <linux/rpmsg/qcom_smd.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/mdt_loader.h>
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#include <linux/soc/qcom/smem.h>
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#include "remoteproc_internal.h"
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#include "qcom_common.h"
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#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
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#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
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#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
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#define MAX_NUM_OF_SS 10
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#define MAX_REGION_NAME_LENGTH 16
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#define SBL_MINIDUMP_SMEM_ID 602
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#define MD_REGION_VALID ('V' << 24 | 'A' << 16 | 'L' << 8 | 'I' << 0)
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#define MD_SS_ENCR_DONE ('D' << 24 | 'O' << 16 | 'N' << 8 | 'E' << 0)
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#define MD_SS_ENABLED ('E' << 24 | 'N' << 16 | 'B' << 8 | 'L' << 0)
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/**
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* struct minidump_region - Minidump region
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* @name : Name of the region to be dumped
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* @seq_num: : Use to differentiate regions with same name.
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* @valid : This entry to be dumped (if set to 1)
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* @address : Physical address of region to be dumped
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* @size : Size of the region
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*/
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struct minidump_region {
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char name[MAX_REGION_NAME_LENGTH];
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__le32 seq_num;
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__le32 valid;
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__le64 address;
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__le64 size;
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};
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/**
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* struct minidump_subsystem_toc: Subsystem's SMEM Table of content
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* @status : Subsystem toc init status
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* @enabled : if set to 1, this region would be copied during coredump
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* @encryption_status: Encryption status for this subsystem
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* @encryption_required : Decides to encrypt the subsystem regions or not
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* @region_count : Number of regions added in this subsystem toc
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* @regions_baseptr : regions base pointer of the subsystem
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*/
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struct minidump_subsystem {
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__le32 status;
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__le32 enabled;
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__le32 encryption_status;
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__le32 encryption_required;
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__le32 region_count;
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__le64 regions_baseptr;
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};
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/**
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* struct minidump_global_toc: Global Table of Content
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* @status : Global Minidump init status
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* @md_revision : Minidump revision
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* @enabled : Minidump enable status
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* @subsystems : Array of subsystems toc
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*/
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struct minidump_global_toc {
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__le32 status;
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__le32 md_revision;
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__le32 enabled;
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struct minidump_subsystem subsystems[MAX_NUM_OF_SS];
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};
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struct qcom_ssr_subsystem {
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const char *name;
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struct srcu_notifier_head notifier_list;
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struct list_head list;
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};
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static LIST_HEAD(qcom_ssr_subsystem_list);
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static DEFINE_MUTEX(qcom_ssr_subsys_lock);
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static void qcom_minidump_cleanup(struct rproc *rproc)
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{
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struct rproc_dump_segment *entry, *tmp;
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list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
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list_del(&entry->node);
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kfree(entry->priv);
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kfree(entry);
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}
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}
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static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsystem *subsystem)
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{
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struct minidump_region __iomem *ptr;
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struct minidump_region region;
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int seg_cnt, i;
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dma_addr_t da;
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size_t size;
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char *name;
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if (WARN_ON(!list_empty(&rproc->dump_segments))) {
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dev_err(&rproc->dev, "dump segment list already populated\n");
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return -EUCLEAN;
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}
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seg_cnt = le32_to_cpu(subsystem->region_count);
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ptr = ioremap((unsigned long)le64_to_cpu(subsystem->regions_baseptr),
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seg_cnt * sizeof(struct minidump_region));
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if (!ptr)
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return -EFAULT;
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for (i = 0; i < seg_cnt; i++) {
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memcpy_fromio(®ion, ptr + i, sizeof(region));
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if (region.valid == MD_REGION_VALID) {
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name = kstrdup(region.name, GFP_KERNEL);
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if (!name) {
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iounmap(ptr);
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return -ENOMEM;
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}
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da = le64_to_cpu(region.address);
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size = le32_to_cpu(region.size);
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rproc_coredump_add_custom_segment(rproc, da, size, NULL, name);
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}
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}
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iounmap(ptr);
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return 0;
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}
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void qcom_minidump(struct rproc *rproc, unsigned int minidump_id)
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{
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int ret;
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struct minidump_subsystem *subsystem;
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struct minidump_global_toc *toc;
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/* Get Global minidump ToC*/
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toc = qcom_smem_get(QCOM_SMEM_HOST_ANY, SBL_MINIDUMP_SMEM_ID, NULL);
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/* check if global table pointer exists and init is set */
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if (IS_ERR(toc) || !toc->status) {
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dev_err(&rproc->dev, "Minidump TOC not found in SMEM\n");
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return;
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}
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/* Get subsystem table of contents using the minidump id */
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subsystem = &toc->subsystems[minidump_id];
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/**
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* Collect minidump if SS ToC is valid and segment table
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* is initialized in memory and encryption status is set.
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*/
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if (subsystem->regions_baseptr == 0 ||
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le32_to_cpu(subsystem->status) != 1 ||
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le32_to_cpu(subsystem->enabled) != MD_SS_ENABLED ||
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le32_to_cpu(subsystem->encryption_status) != MD_SS_ENCR_DONE) {
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dev_err(&rproc->dev, "Minidump not ready, skipping\n");
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return;
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}
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ret = qcom_add_minidump_segments(rproc, subsystem);
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if (ret) {
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dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
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goto clean_minidump;
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}
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rproc_coredump_using_sections(rproc);
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clean_minidump:
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qcom_minidump_cleanup(rproc);
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}
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EXPORT_SYMBOL_GPL(qcom_minidump);
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static int glink_subdev_start(struct rproc_subdev *subdev)
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{
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struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
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glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
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return PTR_ERR_OR_ZERO(glink->edge);
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}
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static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
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{
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struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
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qcom_glink_smem_unregister(glink->edge);
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glink->edge = NULL;
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}
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static void glink_subdev_unprepare(struct rproc_subdev *subdev)
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{
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struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
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qcom_glink_ssr_notify(glink->ssr_name);
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}
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/**
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* qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
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* @rproc: rproc handle to parent the subdevice
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* @glink: reference to a GLINK subdev context
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* @ssr_name: identifier of the associated remoteproc for ssr notifications
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*/
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void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
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const char *ssr_name)
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{
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struct device *dev = &rproc->dev;
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glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
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if (!glink->node)
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return;
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glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
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if (!glink->ssr_name)
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return;
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glink->dev = dev;
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glink->subdev.start = glink_subdev_start;
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glink->subdev.stop = glink_subdev_stop;
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glink->subdev.unprepare = glink_subdev_unprepare;
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rproc_add_subdev(rproc, &glink->subdev);
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}
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EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
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/**
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* qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
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* @rproc: rproc handle
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* @glink: reference to a GLINK subdev context
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*/
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void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
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{
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if (!glink->node)
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return;
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rproc_remove_subdev(rproc, &glink->subdev);
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kfree_const(glink->ssr_name);
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of_node_put(glink->node);
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}
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EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
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/**
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* qcom_register_dump_segments() - register segments for coredump
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* @rproc: remoteproc handle
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* @fw: firmware header
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*
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* Register all segments of the ELF in the remoteproc coredump segment list
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*
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* Return: 0 on success, negative errno on failure.
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*/
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int qcom_register_dump_segments(struct rproc *rproc,
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const struct firmware *fw)
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{
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const struct elf32_phdr *phdrs;
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const struct elf32_phdr *phdr;
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const struct elf32_hdr *ehdr;
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int ret;
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int i;
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ehdr = (struct elf32_hdr *)fw->data;
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phdrs = (struct elf32_phdr *)(ehdr + 1);
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for (i = 0; i < ehdr->e_phnum; i++) {
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phdr = &phdrs[i];
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if (phdr->p_type != PT_LOAD)
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continue;
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if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
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continue;
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if (!phdr->p_memsz)
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continue;
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ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
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phdr->p_memsz);
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if (ret)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
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static int smd_subdev_start(struct rproc_subdev *subdev)
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{
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struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
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smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
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return PTR_ERR_OR_ZERO(smd->edge);
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}
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static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
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{
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struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
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qcom_smd_unregister_edge(smd->edge);
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smd->edge = NULL;
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}
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/**
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* qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
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* @rproc: rproc handle to parent the subdevice
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* @smd: reference to a Qualcomm subdev context
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*/
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void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
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{
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struct device *dev = &rproc->dev;
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smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
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if (!smd->node)
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return;
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smd->dev = dev;
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smd->subdev.start = smd_subdev_start;
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smd->subdev.stop = smd_subdev_stop;
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rproc_add_subdev(rproc, &smd->subdev);
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}
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EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
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/**
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* qcom_remove_smd_subdev() - remove the smd subdevice from rproc
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* @rproc: rproc handle
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* @smd: the SMD subdevice to remove
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*/
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void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
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{
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if (!smd->node)
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return;
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rproc_remove_subdev(rproc, &smd->subdev);
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of_node_put(smd->node);
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}
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EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
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static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
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{
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struct qcom_ssr_subsystem *info;
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mutex_lock(&qcom_ssr_subsys_lock);
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/* Match in the global qcom_ssr_subsystem_list with name */
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list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
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if (!strcmp(info->name, name))
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goto out;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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info = ERR_PTR(-ENOMEM);
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goto out;
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}
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info->name = kstrdup_const(name, GFP_KERNEL);
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srcu_init_notifier_head(&info->notifier_list);
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/* Add to global notification list */
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list_add_tail(&info->list, &qcom_ssr_subsystem_list);
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out:
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mutex_unlock(&qcom_ssr_subsys_lock);
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return info;
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}
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/**
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* qcom_register_ssr_notifier() - register SSR notification handler
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* @name: Subsystem's SSR name
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* @nb: notifier_block to be invoked upon subsystem's state change
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*
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* This registers the @nb notifier block as part the notifier chain for a
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* remoteproc associated with @name. The notifier block's callback
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* will be invoked when the remote processor's SSR events occur
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* (pre/post startup and pre/post shutdown).
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*
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* Return: a subsystem cookie on success, ERR_PTR on failure.
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*/
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void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
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{
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struct qcom_ssr_subsystem *info;
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info = qcom_ssr_get_subsys(name);
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if (IS_ERR(info))
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return info;
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srcu_notifier_chain_register(&info->notifier_list, nb);
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return &info->notifier_list;
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}
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EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
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/**
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* qcom_unregister_ssr_notifier() - unregister SSR notification handler
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* @notify: subsystem cookie returned from qcom_register_ssr_notifier
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* @nb: notifier_block to unregister
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*
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* This function will unregister the notifier from the particular notifier
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* chain.
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*
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* Return: 0 on success, %ENOENT otherwise.
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*/
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int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
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{
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return srcu_notifier_chain_unregister(notify, nb);
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}
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EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
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static int ssr_notify_prepare(struct rproc_subdev *subdev)
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{
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struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
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struct qcom_ssr_notify_data data = {
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.name = ssr->info->name,
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.crashed = false,
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};
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srcu_notifier_call_chain(&ssr->info->notifier_list,
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QCOM_SSR_BEFORE_POWERUP, &data);
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return 0;
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}
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static int ssr_notify_start(struct rproc_subdev *subdev)
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{
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struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
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struct qcom_ssr_notify_data data = {
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.name = ssr->info->name,
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.crashed = false,
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};
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srcu_notifier_call_chain(&ssr->info->notifier_list,
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QCOM_SSR_AFTER_POWERUP, &data);
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return 0;
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}
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static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
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{
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struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
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struct qcom_ssr_notify_data data = {
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.name = ssr->info->name,
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.crashed = crashed,
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};
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srcu_notifier_call_chain(&ssr->info->notifier_list,
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QCOM_SSR_BEFORE_SHUTDOWN, &data);
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}
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static void ssr_notify_unprepare(struct rproc_subdev *subdev)
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{
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struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
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struct qcom_ssr_notify_data data = {
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.name = ssr->info->name,
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.crashed = false,
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};
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srcu_notifier_call_chain(&ssr->info->notifier_list,
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QCOM_SSR_AFTER_SHUTDOWN, &data);
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}
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/**
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* qcom_add_ssr_subdev() - register subdevice as restart notification source
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* @rproc: rproc handle
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* @ssr: SSR subdevice handle
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* @ssr_name: identifier to use for notifications originating from @rproc
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*
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* As the @ssr is registered with the @rproc SSR events will be sent to all
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* registered listeners for the remoteproc when it's SSR events occur
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* (pre/post startup and pre/post shutdown).
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*/
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void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
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|
const char *ssr_name)
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{
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|
struct qcom_ssr_subsystem *info;
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|
|
|
info = qcom_ssr_get_subsys(ssr_name);
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if (IS_ERR(info)) {
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dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
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|
return;
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}
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|
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ssr->info = info;
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|
ssr->subdev.prepare = ssr_notify_prepare;
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|
ssr->subdev.start = ssr_notify_start;
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|
ssr->subdev.stop = ssr_notify_stop;
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|
ssr->subdev.unprepare = ssr_notify_unprepare;
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|
|
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rproc_add_subdev(rproc, &ssr->subdev);
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|
}
|
|
EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
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|
|
|
/**
|
|
* qcom_remove_ssr_subdev() - remove subdevice as restart notification source
|
|
* @rproc: rproc handle
|
|
* @ssr: SSR subdevice handle
|
|
*/
|
|
void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
|
|
{
|
|
rproc_remove_subdev(rproc, &ssr->subdev);
|
|
ssr->info = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
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|
|
|
MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
|
|
MODULE_LICENSE("GPL v2");
|