From patchwork Mon Jun 29 20:02:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rishabh Bhatnagar X-Patchwork-Id: 11632043 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 2CE58913 for ; Mon, 29 Jun 2020 20:04:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05841206A5 for ; Mon, 29 Jun 2020 20:04:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="RgbrB23W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388568AbgF2UDz (ORCPT ); Mon, 29 Jun 2020 16:03:55 -0400 Received: from mail29.static.mailgun.info ([104.130.122.29]:12310 "EHLO mail29.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388372AbgF2UDx (ORCPT ); Mon, 29 Jun 2020 16:03:53 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1593461032; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=fR8ycb/7iBFifRu4sNzNoSY5dt1SKTN22l+yrxyr2zU=; b=RgbrB23W041WQnLxIEMY5h8bL5NgzZ8HTLzVdNEmqUzU9VlBtQE//9/YQgtML/f6yvjNei6g p76b7e1NGdysmdDiKddq7tOFCb6sGR2K6OUpzUjRPNizGwzFRZG3+lVEPcu78BySZN7D7i7O HxM1BMjiI+6ii2kXYzL21vfXkXI= X-Mailgun-Sending-Ip: 104.130.122.29 X-Mailgun-Sid: WyI4ZWZiZiIsICJsaW51eC1yZW1vdGVwcm9jQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n07.prod.us-west-2.postgun.com with SMTP id 5efa4912117610c7ff70c901 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 29 Jun 2020 20:03:30 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 81210C433A0; Mon, 29 Jun 2020 20:03:30 +0000 (UTC) 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=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 Received: from rishabhb-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: rishabhb) by smtp.codeaurora.org (Postfix) with ESMTPSA id 2D771C433A0; Mon, 29 Jun 2020 20:03:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 2D771C433A0 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=none smtp.mailfrom=rishabhb@codeaurora.org From: Rishabh Bhatnagar To: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: bjorn.andersson@linaro.org, mathieu.poirier@linaro.org, tsoni@codeaurora.org, psodagud@codeaurora.org, sidgup@codeaurora.org, Rishabh Bhatnagar Subject: [PATCH v6 2/3] remoteproc: Add inline coredump functionality Date: Mon, 29 Jun 2020 13:02:12 -0700 Message-Id: <1593460933-4262-3-git-send-email-rishabhb@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1593460933-4262-1-git-send-email-rishabhb@codeaurora.org> References: <1593460933-4262-1-git-send-email-rishabhb@codeaurora.org> Sender: linux-remoteproc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org The current coredump implementation uses vmalloc area to copy all the segments. But this might put strain on low memory targets as the firmware size sometimes is in tens of MBs. The situation becomes worse if there are multiple remote processors undergoing recovery at the same time. This patch adds inline coredump functionality that avoids extra memory usage. This requires recovery to be halted until data is read by userspace and free function is called. Signed-off-by: Rishabh Bhatnagar Reviewed-by: Sibi Sankar --- drivers/remoteproc/qcom_q6v5_mss.c | 9 +- drivers/remoteproc/remoteproc_coredump.c | 160 +++++++++++++++++++++++++++---- include/linux/remoteproc.h | 21 +++- 3 files changed, 165 insertions(+), 25 deletions(-) diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c index 903b2bb..d4ff9b8 100644 --- a/drivers/remoteproc/qcom_q6v5_mss.c +++ b/drivers/remoteproc/qcom_q6v5_mss.c @@ -1200,12 +1200,13 @@ static int q6v5_mpss_load(struct q6v5 *qproc) static void qcom_q6v5_dump_segment(struct rproc *rproc, struct rproc_dump_segment *segment, - void *dest) + void *dest, size_t cp_offset, size_t size) { int ret = 0; struct q6v5 *qproc = rproc->priv; unsigned long mask = BIT((unsigned long)segment->priv); int offset = segment->da - qproc->mpss_reloc; + size_t cp_size = size ? size : segment->size; void *ptr = NULL; /* Unlock mba before copying segments */ @@ -1221,13 +1222,13 @@ static void qcom_q6v5_dump_segment(struct rproc *rproc, } if (!ret) - ptr = ioremap_wc(qproc->mpss_phys + offset, segment->size); + ptr = ioremap_wc(qproc->mpss_phys + offset + cp_offset, cp_size); if (ptr) { - memcpy(dest, ptr, segment->size); + memcpy(dest, ptr, cp_size); iounmap(ptr); } else { - memset(dest, 0xff, segment->size); + memset(dest, 0xff, cp_size); } qproc->dump_segment_mask |= mask; diff --git a/drivers/remoteproc/remoteproc_coredump.c b/drivers/remoteproc/remoteproc_coredump.c index ded0244..646886f 100644 --- a/drivers/remoteproc/remoteproc_coredump.c +++ b/drivers/remoteproc/remoteproc_coredump.c @@ -5,6 +5,7 @@ * Copyright (c) 2020, The Linux Foundation. All rights reserved. */ +#include #include #include #include @@ -12,6 +13,12 @@ #include "remoteproc_internal.h" #include "remoteproc_elf_helpers.h" +struct rproc_coredump_state { + struct rproc *rproc; + void *header; + struct completion dump_done; +}; + /** * rproc_coredump_cleanup() - clean up dump_segments list * @rproc: the remote processor handle @@ -72,7 +79,8 @@ int rproc_coredump_add_custom_segment(struct rproc *rproc, dma_addr_t da, size_t size, void (*dumpfn)(struct rproc *rproc, struct rproc_dump_segment *segment, - void *dest), + void *dest, size_t offset, + size_t size), void *priv) { struct rproc_dump_segment *segment; @@ -114,12 +122,110 @@ int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine) } EXPORT_SYMBOL(rproc_coredump_set_elf_info); +static void rproc_coredump_free(void *data) +{ + struct rproc_coredump_state *dump_state = data; + + complete(&dump_state->dump_done); + vfree(dump_state->header); +} + +static void *rproc_coredump_find_segment(loff_t user_offset, + struct list_head *segments, + size_t *data_left) +{ + struct rproc_dump_segment *segment; + + list_for_each_entry(segment, segments, node) { + if (user_offset < segment->size) { + *data_left = segment->size - user_offset; + return segment; + } + user_offset -= segment->size; + } + + *data_left = 0; + return NULL; +} + +static void rproc_copy_segment(struct rproc *rproc, void *dest, + struct rproc_dump_segment *segment, + size_t offset, size_t size) +{ + void *ptr; + + if (segment->dump) { + segment->dump(rproc, segment, dest, offset, size); + } else { + ptr = rproc_da_to_va(rproc, segment->da + offset, size); + if (!ptr) { + dev_err(&rproc->dev, + "invalid copy request for segment %pad with offset %zu and size %zu)\n", + &segment->da, offset, size); + memset(dest, 0xff, size); + } else { + memcpy(dest, ptr, size); + } + } +} + +static ssize_t rproc_coredump_read(char *buffer, loff_t offset, size_t count, + void *data, size_t header_sz) +{ + size_t seg_data, bytes_left = count; + ssize_t copy_sz; + struct rproc_dump_segment *seg; + struct rproc_coredump_state *dump_state = data; + struct rproc *rproc = dump_state->rproc; + void *elfcore = dump_state->header; + + /* Copy the vmalloc'ed header first. */ + if (offset < header_sz) { + copy_sz = memory_read_from_buffer(buffer, count, &offset, + elfcore, header_sz); + + return copy_sz; + } + + /* + * Find out the segment memory chunk to be copied based on offset. + * Keep copying data until count bytes are read. + */ + while (bytes_left) { + seg = rproc_coredump_find_segment(offset - header_sz, + &rproc->dump_segments, + &seg_data); + /* EOF check */ + if (!seg) { + dev_info(&rproc->dev, "Ramdump done, %lld bytes read", + offset); + break; + } + + copy_sz = min_t(size_t, bytes_left, seg_data); + + rproc_copy_segment(rproc, buffer, seg, seg->size - seg_data, + copy_sz); + + offset += copy_sz; + buffer += copy_sz; + bytes_left -= copy_sz; + } + + return count - bytes_left; +} + /** * rproc_coredump() - perform coredump * @rproc: rproc handle * * This function will generate an ELF header for the registered segments - * and create a devcoredump device associated with rproc. + * 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_coredump(struct rproc *rproc) { @@ -129,11 +235,13 @@ void rproc_coredump(struct rproc *rproc) size_t data_size; size_t offset; void *data; - void *ptr; u8 class = rproc->elf_class; int phnum = 0; + struct rproc_coredump_state dump_state; + enum rproc_dump_mechanism dump_conf = rproc->dump_conf; - if (list_empty(&rproc->dump_segments)) + if (list_empty(&rproc->dump_segments) || + dump_conf == RPROC_COREDUMP_DISABLED) return; if (class == ELFCLASSNONE) { @@ -143,7 +251,14 @@ void rproc_coredump(struct rproc *rproc) data_size = elf_size_of_hdr(class); list_for_each_entry(segment, &rproc->dump_segments, node) { - data_size += elf_size_of_phdr(class) + segment->size; + /* + * For default configuration buffer includes headers & segments. + * For inline dump buffer just includes headers as segments are + * directly read from device memory. + */ + data_size += elf_size_of_phdr(class); + if (dump_conf == RPROC_COREDUMP_DEFAULT) + data_size += segment->size; phnum++; } @@ -182,23 +297,30 @@ void rproc_coredump(struct rproc *rproc) elf_phdr_set_p_flags(class, phdr, PF_R | PF_W | PF_X); elf_phdr_set_p_align(class, phdr, 0); - if (segment->dump) { - segment->dump(rproc, segment, data + offset); - } else { - ptr = rproc_da_to_va(rproc, segment->da, segment->size); - if (!ptr) { - dev_err(&rproc->dev, - "invalid coredump segment (%pad, %zu)\n", - &segment->da, segment->size); - memset(data + offset, 0xff, segment->size); - } else { - memcpy(data + offset, ptr, segment->size); - } - } + if (dump_conf == RPROC_COREDUMP_DEFAULT) + rproc_copy_segment(rproc, data + offset, segment, 0, + segment->size); offset += elf_phdr_get_p_filesz(class, phdr); phdr += elf_size_of_phdr(class); } - dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL); + 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); } diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index e7b7bab..43e45a3 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -435,6 +435,20 @@ enum rproc_crash_type { }; /** + * enum rproc_dump_mechanism - Coredump options for core + * @RPROC_COREDUMP_DEFAULT: Copy dump to separate buffer and carry on with + recovery + * @RPROC_COREDUMP_INLINE: Read segments directly from device memory. Stall + recovery until all segments are read + * @RPROC_COREDUMP_DISABLED: Don't perform any dump + */ +enum rproc_dump_mechanism { + RPROC_COREDUMP_DEFAULT, + RPROC_COREDUMP_INLINE, + RPROC_COREDUMP_DISABLED, +}; + +/** * struct rproc_dump_segment - segment info from ELF header * @node: list node related to the rproc segment list * @da: device address of the segment @@ -451,7 +465,7 @@ struct rproc_dump_segment { void *priv; void (*dump)(struct rproc *rproc, struct rproc_dump_segment *segment, - void *dest); + void *dest, size_t offset, size_t size); loff_t offset; }; @@ -466,6 +480,7 @@ struct rproc_dump_segment { * @dev: virtual device for refcounting and common remoteproc behavior * @power: refcount of users who need this rproc powered up * @state: state of the device + * @dump_conf: Currenlty selected coredump configuration * @lock: lock which protects concurrent manipulations of the rproc * @dbg_dir: debugfs directory of this rproc device * @traces: list of trace buffers @@ -499,6 +514,7 @@ struct rproc { struct device dev; atomic_t power; unsigned int state; + enum rproc_dump_mechanism dump_conf; struct mutex lock; struct dentry *dbg_dir; struct list_head traces; @@ -630,7 +646,8 @@ int rproc_coredump_add_custom_segment(struct rproc *rproc, dma_addr_t da, size_t size, void (*dumpfn)(struct rproc *rproc, struct rproc_dump_segment *segment, - void *dest), + void *dest, size_t offset, + size_t size), void *priv); int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine);