From patchwork Thu Sep 10 18:57:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddharth Gupta X-Patchwork-Id: 11768799 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D921659D for ; Thu, 10 Sep 2020 18:58:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9F91921582 for ; Thu, 10 Sep 2020 18:58:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="kzHPMmUP"; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b="RPztm3K2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726853AbgIJS6X (ORCPT ); Thu, 10 Sep 2020 14:58:23 -0400 Received: from a27-55.smtp-out.us-west-2.amazonses.com ([54.240.27.55]:48692 "EHLO a27-55.smtp-out.us-west-2.amazonses.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726731AbgIJS5f (ORCPT ); Thu, 10 Sep 2020 14:57:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=zsmsymrwgfyinv5wlfyidntwsjeeldzt; d=codeaurora.org; t=1599764254; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; bh=ClW5GDm+2DlpPQXbrDpXvHFeylp6dhk/hdoBRh+u6pg=; b=kzHPMmUPkTKe+LAZyv2RoxSyNMKCq/F50Wy3qiE4AR0PRRgOjTHNSw5gqefP7EvC ZOI2uE/LHMQZeicGObi/uf72lvASGBCKqAYKoxl3IAx95eMuAsO6OZuI0kBK2Lp9kN1 6OiZ3eLWtcZ/PNIN19xeqwc0hnVyKwpYqYWIm9SU= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=hsbnp7p3ensaochzwyq5wwmceodymuwv; d=amazonses.com; t=1599764254; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References:Feedback-ID; bh=ClW5GDm+2DlpPQXbrDpXvHFeylp6dhk/hdoBRh+u6pg=; b=RPztm3K2kRlQUmZQDCtkSdQbldJLFC/wW/L6vCrg/lMnMsNQkxjIAVL2MhB6xbTF h7DOL5j6Pf/qbxkrVHrsdhRr73zUD40hfrotge40J27hxGy/ON1UfTmn8Vp6K34vNkB 1hAa6jO98asuhtOL7iBwAzwWmRZiVJUThET6g7DA= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=ALL_TRUSTED,BAYES_00,SPF_FAIL, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8A79BC433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=sidgup@codeaurora.org From: Siddharth Gupta To: agross@kernel.org, bjorn.andersson@linaro.org, ohad@wizery.com Cc: Siddharth Gupta , linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, tsoni@codeaurora.org, psodagud@codeaurora.org, rishabhb@codeaurora.org, linux-doc@vger.kernel.org, Gurbir Arora Subject: [PATCH v4 2/3] remoteproc: qcom: Add capability to collect minidumps Date: Thu, 10 Sep 2020 18:57:34 +0000 Message-ID: <0101017479614cf2-4544c5b8-572f-4aab-9f2c-35b263829012-000000@us-west-2.amazonses.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599764242-690-1-git-send-email-sidgup@codeaurora.org> References: <1599764242-690-1-git-send-email-sidgup@codeaurora.org> X-SES-Outgoing: 2020.09.10-54.240.27.55 Feedback-ID: 1.us-west-2.CZuq2qbDmUIuT3qdvXlRHZZCpfZqZ4GtG9v3VKgRyF0=:AmazonSES Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org 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. Signed-off-by: Rishabh Bhatnagar Signed-off-by: Gurbir Arora Signed-off-by: Siddharth Gupta --- drivers/remoteproc/qcom_minidump.h | 64 +++++++++++++ drivers/remoteproc/qcom_q6v5_pas.c | 106 ++++++++++++++++++++- drivers/remoteproc/remoteproc_coredump.c | 138 ++++++++++++++++++++++++++++ drivers/remoteproc/remoteproc_elf_helpers.h | 27 ++++++ include/linux/remoteproc.h | 1 + 5 files changed, 334 insertions(+), 2 deletions(-) create mode 100644 drivers/remoteproc/qcom_minidump.h diff --git a/drivers/remoteproc/qcom_minidump.h b/drivers/remoteproc/qcom_minidump.h new file mode 100644 index 0000000..437e030 --- /dev/null +++ b/drivers/remoteproc/qcom_minidump.h @@ -0,0 +1,64 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2020, The Linux Foundation. All rights reserved. + */ + +#ifndef __QCOM_MINIDUMP_H +#define __QCOM_MINIDUMP_H + +#define MAX_NUM_OF_SS 10 +#define MAX_REGION_NAME_LENGTH 16 +#define SBL_MINIDUMP_SMEM_ID 602 +#define MD_REGION_VALID ('V' << 24 | 'A' << 16 | 'L' << 8 | 'I' << 0) +#define MD_SS_ENCR_DONE ('D' << 24 | 'O' << 16 | 'N' << 8 | 'E' << 0) +#define MD_SS_ENABLED ('E' << 24 | 'N' << 16 | 'B' << 8 | 'L' << 0) + +/** + * md_ss_region - Minidump region + * @name : Name of the region to be dumped + * @seq_num: : Use to differentiate regions with same name. + * @md_valid : This entry to be dumped (if set to 1) + * @region_base_address : Physical address of region to be dumped + * @region_size : Size of the region + */ +struct md_ss_region { + char name[MAX_REGION_NAME_LENGTH]; + u32 seq_num; + u32 md_valid; + u64 region_base_address; + u64 region_size; +}; + +/** + * md_ss_toc: Subsystem's SMEM Table of content + * @md_ss_toc_init : Subsystem toc init status + * @md_ss_enable_status : if set to 1, this region would be copied during coredump + * @encryption_status: Encryption status for this subsystem + * @encryption_required : Decides to encrypt the subsystem regions or not + * @ss_region_count : Number of regions added in this subsystem toc + * @md_ss_smem_regions_baseptr : regions base pointer of the subsystem + */ +struct md_ss_toc { + u32 md_ss_toc_init; + u32 md_ss_enable_status; + u32 encryption_status; + u32 encryption_required; + u32 ss_region_count; + u64 md_ss_smem_regions_baseptr; +}; + +/** + * md_global_toc: Global Table of Content + * @md_toc_init : Global Minidump init status + * @md_revision : Minidump revision + * @md_enable_status : Minidump enable status + * @md_ss_toc : Array of subsystems toc + */ +struct md_global_toc { + u32 md_toc_init; + u32 md_revision; + u32 md_enable_status; + struct md_ss_toc md_ss_toc[MAX_NUM_OF_SS]; +}; + +#endif diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c index 3837f23..c01e81e 100644 --- a/drivers/remoteproc/qcom_q6v5_pas.c +++ b/drivers/remoteproc/qcom_q6v5_pas.c @@ -28,11 +28,13 @@ #include "qcom_pil_info.h" #include "qcom_q6v5.h" #include "remoteproc_internal.h" +#include "qcom_minidump.h" struct adsp_data { int crash_reason_smem; const char *firmware_name; int pas_id; + unsigned int minidump_id; bool has_aggre2_clk; bool auto_boot; @@ -63,6 +65,7 @@ struct qcom_adsp { int proxy_pd_count; int pas_id; + unsigned int minidump_id; int crash_reason_smem; bool has_aggre2_clk; const char *info_name; @@ -81,6 +84,8 @@ struct qcom_adsp { struct qcom_sysmon *sysmon; }; +static struct md_global_toc *g_md_toc; + static int adsp_pds_enable(struct qcom_adsp *adsp, struct device **pds, size_t pd_count) { @@ -116,6 +121,88 @@ static void adsp_pds_disable(struct qcom_adsp *adsp, struct device **pds, } } +static void adsp_add_minidump_segments(struct rproc *rproc, struct md_ss_toc *minidump_ss) +{ + struct md_ss_region __iomem *region_info; + int seg_cnt = 0, i; + void __iomem *ptr; + dma_addr_t da; + size_t size; + char *name; + + seg_cnt = minidump_ss->ss_region_count; + ptr = ioremap((unsigned long)minidump_ss->md_ss_smem_regions_baseptr, + seg_cnt * sizeof(struct md_ss_region)); + + if (!ptr) + return; + + region_info = ptr; + + if (!list_empty(&rproc->dump_segments)) { + dev_info(&rproc->dev, "dump segment list already populated\n"); + goto unmap_iomem; + } + + for (i = 0; i < seg_cnt; i++) { + if (__raw_readl(®ion_info->md_valid) == MD_REGION_VALID) { + name = kmalloc(MAX_REGION_NAME_LENGTH, GFP_KERNEL); + memcpy(name, region_info->name, sizeof(region_info->name)); + da = region_info->region_base_address; + size = region_info->region_size; + rproc_coredump_add_custom_segment(rproc, da, size, NULL, name); + } + region_info++; + } + +unmap_iomem: + iounmap(ptr); +} + +static void adsp_dump(struct rproc *rproc) +{ + struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv; + struct md_ss_toc *minidump_ss; + size_t size; + + /* Get Global minidump ToC*/ + if (!g_md_toc) + g_md_toc = qcom_smem_get(QCOM_SMEM_HOST_ANY, + SBL_MINIDUMP_SMEM_ID, &size); + + /* check if global table pointer exists and init is set */ + if (IS_ERR(g_md_toc) || !(g_md_toc->md_toc_init)) { + dev_err(&rproc->dev, "SMEM is not initialized.\n"); + return; + } + + /* Get subsystem table of contents using the minidump id */ + minidump_ss = &g_md_toc->md_ss_toc[adsp->minidump_id]; + + /** + * Collect minidump if SS ToC is valid and segment table + * is initialized in memory and encryption status is set. + */ + if (minidump_ss->md_ss_smem_regions_baseptr == 0 || + minidump_ss->md_ss_toc_init != 1 || + minidump_ss->md_ss_enable_status != MD_SS_ENABLED || + minidump_ss->encryption_status != MD_SS_ENCR_DONE) { + dev_err(&rproc->dev, "Minidump not ready!! Aborting\n"); + return; + } + + adsp_add_minidump_segments(rproc, minidump_ss); + rproc_minidump(rproc); +} + +static void adsp_priv_cleanup(struct rproc *rproc) +{ + struct rproc_dump_segment *segment; + + list_for_each_entry(segment, &rproc->dump_segments, node) + kfree(segment->priv); +} + static int adsp_load(struct rproc *rproc, const struct firmware *fw) { struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv; @@ -258,6 +345,15 @@ static const struct rproc_ops adsp_ops = { .panic = adsp_panic, }; +static const struct rproc_ops adsp_minidump_ops = { + .start = adsp_start, + .stop = adsp_stop, + .da_to_va = adsp_da_to_va, + .load = adsp_load, + .coredump = adsp_dump, + .priv_cleanup = adsp_priv_cleanup, +}; + static int adsp_init_clock(struct qcom_adsp *adsp) { int ret; @@ -398,8 +494,13 @@ static int adsp_probe(struct platform_device *pdev) if (ret < 0 && ret != -EINVAL) return ret; - rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_ops, - fw_name, sizeof(*adsp)); + if (desc->minidump_id) + rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_minidump_ops, fw_name, + sizeof(*adsp)); + else + rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_ops, fw_name, + sizeof(*adsp)); + if (!rproc) { dev_err(&pdev->dev, "unable to allocate remoteproc\n"); return -ENOMEM; @@ -411,6 +512,7 @@ static int adsp_probe(struct platform_device *pdev) adsp = (struct qcom_adsp *)rproc->priv; adsp->dev = &pdev->dev; adsp->rproc = rproc; + adsp->minidump_id = desc->minidump_id; adsp->pas_id = desc->pas_id; adsp->has_aggre2_clk = desc->has_aggre2_clk; adsp->info_name = desc->sysmon_name; diff --git a/drivers/remoteproc/remoteproc_coredump.c b/drivers/remoteproc/remoteproc_coredump.c index bb15a29..0495389 100644 --- a/drivers/remoteproc/remoteproc_coredump.c +++ b/drivers/remoteproc/remoteproc_coredump.c @@ -13,6 +13,8 @@ #include "remoteproc_internal.h" #include "remoteproc_elf_helpers.h" +#define MAX_STRTBL_SIZE 512 + struct rproc_coredump_state { struct rproc *rproc; void *header; @@ -27,6 +29,9 @@ void rproc_coredump_cleanup(struct rproc *rproc) { struct rproc_dump_segment *entry, *tmp; + if (rproc->ops->priv_cleanup) + rproc->ops->priv_cleanup(rproc); + list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) { list_del(&entry->node); kfree(entry); @@ -323,3 +328,136 @@ void rproc_coredump(struct rproc *rproc) */ wait_for_completion(&dump_state.dump_done); } + +/** + * rproc_minidump() - perform minidump + * @rproc: rproc handle + * + * This function will generate an ELF header for the registered sections of + * segments and create a devcoredump device associated with rproc. Based on + * the coredump configuration this function will directly copy the segments + * from device memory to userspace or copy segments from device memory to + * a separate buffer, which can then be read by userspace. + * The first approach avoids using extra vmalloc memory. But it will stall + * recovery flow until dump is read by userspace. + */ +void rproc_minidump(struct rproc *rproc) +{ + struct rproc_dump_segment *segment; + void *shdr; + void *ehdr; + size_t data_size; + size_t offset; + void *data; + u8 class = rproc->elf_class; + int shnum; + struct rproc_coredump_state dump_state; + unsigned int dump_conf = rproc->dump_conf; + char *str_tbl = "STR_TBL"; + + if (list_empty(&rproc->dump_segments) || + dump_conf == RPROC_COREDUMP_DISABLED) + return; + + if (class == ELFCLASSNONE) { + dev_err(&rproc->dev, "Elf class is not set\n"); + return; + } + + /* + * We allocate two extra section headers. The first one is null. + * Second section header is for the string table. Also space is + * allocated for string table. + */ + data_size = elf_size_of_hdr(class) + 2 * elf_size_of_shdr(class) + + MAX_STRTBL_SIZE; + shnum = 2; + + list_for_each_entry(segment, &rproc->dump_segments, node) { + data_size += elf_size_of_shdr(class); + if (dump_conf == RPROC_COREDUMP_DEFAULT) + data_size += segment->size; + shnum++; + } + + data = vmalloc(data_size); + if (!data) + return; + + ehdr = data; + memset(ehdr, 0, elf_size_of_hdr(class)); + /* e_ident field is common for both elf32 and elf64 */ + elf_hdr_init_ident(ehdr, class); + + elf_hdr_set_e_type(class, ehdr, ET_CORE); + elf_hdr_set_e_machine(class, ehdr, rproc->elf_machine); + elf_hdr_set_e_version(class, ehdr, EV_CURRENT); + elf_hdr_set_e_entry(class, ehdr, rproc->bootaddr); + elf_hdr_set_e_shoff(class, ehdr, elf_size_of_hdr(class)); + elf_hdr_set_e_ehsize(class, ehdr, elf_size_of_hdr(class)); + elf_hdr_set_e_shentsize(class, ehdr, elf_size_of_shdr(class)); + elf_hdr_set_e_shnum(class, ehdr, shnum); + elf_hdr_set_e_shstrndx(class, ehdr, 1); + + /* Set the first section header as null and move to the next one. */ + shdr = data + elf_hdr_get_e_shoff(class, ehdr); + memset(shdr, 0, elf_size_of_shdr(class)); + shdr += elf_size_of_shdr(class); + + /* Initialize the string table. */ + offset = elf_hdr_get_e_shoff(class, ehdr) + + elf_size_of_shdr(class) * elf_hdr_get_e_shnum(class, ehdr); + memset(data + offset, 0, MAX_STRTBL_SIZE); + + /* Fill in the string table section header. */ + memset(shdr, 0, elf_size_of_shdr(class)); + elf_shdr_set_sh_type(class, shdr, SHT_STRTAB); + elf_shdr_set_sh_offset(class, shdr, offset); + elf_shdr_set_sh_size(class, shdr, MAX_STRTBL_SIZE); + elf_shdr_set_sh_entsize(class, shdr, 0); + elf_shdr_set_sh_flags(class, shdr, 0); + elf_shdr_set_sh_name(class, shdr, set_section_name(str_tbl, ehdr, class)); + offset += elf_shdr_get_sh_size(class, shdr); + shdr += elf_size_of_shdr(class); + + list_for_each_entry(segment, &rproc->dump_segments, node) { + memset(shdr, 0, elf_size_of_shdr(class)); + elf_shdr_set_sh_type(class, shdr, SHT_PROGBITS); + elf_shdr_set_sh_offset(class, shdr, offset); + elf_shdr_set_sh_addr(class, shdr, segment->da); + elf_shdr_set_sh_size(class, shdr, segment->size); + elf_shdr_set_sh_entsize(class, shdr, 0); + elf_shdr_set_sh_flags(class, shdr, SHF_WRITE); + elf_shdr_set_sh_name(class, shdr, + set_section_name(segment->priv, ehdr, class)); + + /* No need to copy segments for inline dumps */ + if (dump_conf == RPROC_COREDUMP_DEFAULT) + rproc_copy_segment(rproc, data + offset, segment, 0, + segment->size); + offset += elf_shdr_get_sh_size(class, shdr); + shdr += elf_size_of_shdr(class); + } + + if (dump_conf == RPROC_COREDUMP_DEFAULT) { + dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL); + return; + } + + /* Initialize the dump state struct to be used by rproc_coredump_read */ + dump_state.rproc = rproc; + dump_state.header = data; + init_completion(&dump_state.dump_done); + + dev_coredumpm(&rproc->dev, NULL, &dump_state, data_size, GFP_KERNEL, + rproc_coredump_read, rproc_coredump_free); + + /* Wait until the dump is read and free is called. Data is freed + * by devcoredump framework automatically after 5 minutes. + */ + wait_for_completion(&dump_state.dump_done); + + list_for_each_entry(segment, &rproc->dump_segments, node) + kfree(segment->priv); +} +EXPORT_SYMBOL(rproc_minidump); diff --git a/drivers/remoteproc/remoteproc_elf_helpers.h b/drivers/remoteproc/remoteproc_elf_helpers.h index 4b6be7b..d83ebca 100644 --- a/drivers/remoteproc/remoteproc_elf_helpers.h +++ b/drivers/remoteproc/remoteproc_elf_helpers.h @@ -11,6 +11,7 @@ #include #include +#define MAX_NAME_LENGTH 16 /** * fw_elf_get_class - Get elf class * @fw: the ELF firmware image @@ -65,6 +66,7 @@ ELF_GEN_FIELD_GET_SET(hdr, e_type, u16) ELF_GEN_FIELD_GET_SET(hdr, e_version, u32) ELF_GEN_FIELD_GET_SET(hdr, e_ehsize, u32) ELF_GEN_FIELD_GET_SET(hdr, e_phentsize, u16) +ELF_GEN_FIELD_GET_SET(hdr, e_shentsize, u16) ELF_GEN_FIELD_GET_SET(phdr, p_paddr, u64) ELF_GEN_FIELD_GET_SET(phdr, p_vaddr, u64) @@ -74,6 +76,9 @@ ELF_GEN_FIELD_GET_SET(phdr, p_type, u32) ELF_GEN_FIELD_GET_SET(phdr, p_offset, u64) ELF_GEN_FIELD_GET_SET(phdr, p_flags, u32) ELF_GEN_FIELD_GET_SET(phdr, p_align, u64) +ELF_GEN_FIELD_GET_SET(shdr, sh_type, u32) +ELF_GEN_FIELD_GET_SET(shdr, sh_flags, u32) +ELF_GEN_FIELD_GET_SET(shdr, sh_entsize, u16) ELF_GEN_FIELD_GET_SET(shdr, sh_size, u64) ELF_GEN_FIELD_GET_SET(shdr, sh_offset, u64) @@ -93,4 +98,26 @@ ELF_STRUCT_SIZE(shdr) ELF_STRUCT_SIZE(phdr) ELF_STRUCT_SIZE(hdr) +static inline unsigned int set_section_name(const char *name, void *ehdr, + u8 class) +{ + u16 shstrndx = elf_hdr_get_e_shstrndx(class, ehdr); + void *shdr; + char *strtab; + static int strtable_idx = 1; + int idx, ret = 0; + + shdr = ehdr + elf_size_of_hdr(class) + shstrndx * elf_size_of_shdr(class); + strtab = ehdr + elf_shdr_get_sh_offset(class, shdr); + idx = strtable_idx; + if (!strtab || !name) + return 0; + + ret = idx; + idx += strlcpy((strtab + idx), name, MAX_NAME_LENGTH); + strtable_idx = idx + 1; + + return ret; +} + #endif /* REMOTEPROC_ELF_LOADER_H */ diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index a489aec..b7a5f93 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -658,6 +658,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len, int rproc_boot(struct rproc *rproc); void rproc_shutdown(struct rproc *rproc); void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type); +void rproc_minidump(struct rproc *rproc); int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size); int rproc_coredump_add_custom_segment(struct rproc *rproc, dma_addr_t da, size_t size,