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Date:   Thu, 21 May 2020 15:30:39 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, sidgup@...eaurora.org
Subject: Re: [PATCH v3 1/3] remoteproc: Move coredump functionality to a new
 file

On Thu, May 14, 2020 at 01:07:34PM -0700, Rishabh Bhatnagar wrote:
> Move all coredump functionality to an individual file. This is
> being done so that the current functionality can be extended
> in future patchsets.
> 
> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> ---
>  drivers/remoteproc/Makefile              |   1 +
>  drivers/remoteproc/remoteproc_core.c     | 191 -----------------------------
>  drivers/remoteproc/remoteproc_coredump.c | 204 +++++++++++++++++++++++++++++++
>  drivers/remoteproc/remoteproc_internal.h |   4 +
>  4 files changed, 209 insertions(+), 191 deletions(-)
>  create mode 100644 drivers/remoteproc/remoteproc_coredump.c
>

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
 
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 0effd38..f1a33c3 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -5,6 +5,7 @@
>  
>  obj-$(CONFIG_REMOTEPROC)		+= remoteproc.o
>  remoteproc-y				:= remoteproc_core.o
> +remoteproc-y				+= remoteproc_coredump.o
>  remoteproc-y				+= remoteproc_debugfs.o
>  remoteproc-y				+= remoteproc_sysfs.o
>  remoteproc-y				+= remoteproc_virtio.o
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 4bd0f45..22575f4 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -26,7 +26,6 @@
>  #include <linux/firmware.h>
>  #include <linux/string.h>
>  #include <linux/debugfs.h>
> -#include <linux/devcoredump.h>
>  #include <linux/rculist.h>
>  #include <linux/remoteproc.h>
>  #include <linux/iommu.h>
> @@ -40,7 +39,6 @@
>  #include <linux/platform_device.h>
>  
>  #include "remoteproc_internal.h"
> -#include "remoteproc_elf_helpers.h"
>  
>  #define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL
>  
> @@ -1238,19 +1236,6 @@ static int rproc_alloc_registered_carveouts(struct rproc *rproc)
>  	return 0;
>  }
>  
> -/**
> - * rproc_coredump_cleanup() - clean up dump_segments list
> - * @rproc: the remote processor handle
> - */
> -static void rproc_coredump_cleanup(struct rproc *rproc)
> -{
> -	struct rproc_dump_segment *entry, *tmp;
> -
> -	list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
> -		list_del(&entry->node);
> -		kfree(entry);
> -	}
> -}
>  
>  /**
>   * rproc_resource_cleanup() - clean up and free all acquired resources
> @@ -1509,182 +1494,6 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
>  	return 0;
>  }
>  
> -/**
> - * rproc_coredump_add_segment() - add segment of device memory to coredump
> - * @rproc:	handle of a remote processor
> - * @da:		device address
> - * @size:	size of segment
> - *
> - * Add device memory to the list of segments to be included in a coredump for
> - * the remoteproc.
> - *
> - * Return: 0 on success, negative errno on error.
> - */
> -int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size)
> -{
> -	struct rproc_dump_segment *segment;
> -
> -	segment = kzalloc(sizeof(*segment), GFP_KERNEL);
> -	if (!segment)
> -		return -ENOMEM;
> -
> -	segment->da = da;
> -	segment->size = size;
> -
> -	list_add_tail(&segment->node, &rproc->dump_segments);
> -
> -	return 0;
> -}
> -EXPORT_SYMBOL(rproc_coredump_add_segment);
> -
> -/**
> - * rproc_coredump_add_custom_segment() - add custom coredump segment
> - * @rproc:	handle of a remote processor
> - * @da:		device address
> - * @size:	size of segment
> - * @dumpfn:	custom dump function called for each segment during coredump
> - * @priv:	private data
> - *
> - * Add device memory to the list of segments to be included in the coredump
> - * and associate the segment with the given custom dump function and private
> - * data.
> - *
> - * Return: 0 on success, negative errno on error.
> - */
> -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 *priv)
> -{
> -	struct rproc_dump_segment *segment;
> -
> -	segment = kzalloc(sizeof(*segment), GFP_KERNEL);
> -	if (!segment)
> -		return -ENOMEM;
> -
> -	segment->da = da;
> -	segment->size = size;
> -	segment->priv = priv;
> -	segment->dump = dumpfn;
> -
> -	list_add_tail(&segment->node, &rproc->dump_segments);
> -
> -	return 0;
> -}
> -EXPORT_SYMBOL(rproc_coredump_add_custom_segment);
> -
> -/**
> - * rproc_coredump_set_elf_info() - set coredump elf information
> - * @rproc:	handle of a remote processor
> - * @class:	elf class for coredump elf file
> - * @machine:	elf machine for coredump elf file
> - *
> - * Set elf information which will be used for coredump elf file.
> - *
> - * Return: 0 on success, negative errno on error.
> - */
> -int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine)
> -{
> -	if (class != ELFCLASS64 && class != ELFCLASS32)
> -		return -EINVAL;
> -
> -	rproc->elf_class = class;
> -	rproc->elf_machine = machine;
> -
> -	return 0;
> -}
> -EXPORT_SYMBOL(rproc_coredump_set_elf_info);
> -
> -/**
> - * 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.
> - */
> -static void rproc_coredump(struct rproc *rproc)
> -{
> -	struct rproc_dump_segment *segment;
> -	void *phdr;
> -	void *ehdr;
> -	size_t data_size;
> -	size_t offset;
> -	void *data;
> -	void *ptr;
> -	u8 class = rproc->elf_class;
> -	int phnum = 0;
> -
> -	if (list_empty(&rproc->dump_segments))
> -		return;
> -
> -	if (class == ELFCLASSNONE) {
> -		dev_err(&rproc->dev, "Elf class is not set\n");
> -		return;
> -	}
> -
> -	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;
> -
> -		phnum++;
> -	}
> -
> -	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_phoff(class, ehdr, elf_size_of_hdr(class));
> -	elf_hdr_set_e_ehsize(class, ehdr, elf_size_of_hdr(class));
> -	elf_hdr_set_e_phentsize(class, ehdr, elf_size_of_phdr(class));
> -	elf_hdr_set_e_phnum(class, ehdr, phnum);
> -
> -	phdr = data + elf_hdr_get_e_phoff(class, ehdr);
> -	offset = elf_hdr_get_e_phoff(class, ehdr);
> -	offset += elf_size_of_phdr(class) * elf_hdr_get_e_phnum(class, ehdr);
> -
> -	list_for_each_entry(segment, &rproc->dump_segments, node) {
> -		memset(phdr, 0, elf_size_of_phdr(class));
> -		elf_phdr_set_p_type(class, phdr, PT_LOAD);
> -		elf_phdr_set_p_offset(class, phdr, offset);
> -		elf_phdr_set_p_vaddr(class, phdr, segment->da);
> -		elf_phdr_set_p_paddr(class, phdr, segment->da);
> -		elf_phdr_set_p_filesz(class, phdr, segment->size);
> -		elf_phdr_set_p_memsz(class, phdr, segment->size);
> -		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);
> -			}
> -		}
> -
> -		offset += elf_phdr_get_p_filesz(class, phdr);
> -		phdr += elf_size_of_phdr(class);
> -	}
> -
> -	dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
> -}
>  
>  /**
>   * rproc_trigger_recovery() - recover a remoteproc
> diff --git a/drivers/remoteproc/remoteproc_coredump.c b/drivers/remoteproc/remoteproc_coredump.c
> new file mode 100644
> index 0000000..ded0244
> --- /dev/null
> +++ b/drivers/remoteproc/remoteproc_coredump.c
> @@ -0,0 +1,204 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Coredump functionality for Remoteproc framework.
> + *
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/devcoredump.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/remoteproc.h>
> +#include "remoteproc_internal.h"
> +#include "remoteproc_elf_helpers.h"
> +
> +/**
> + * rproc_coredump_cleanup() - clean up dump_segments list
> + * @rproc: the remote processor handle
> + */
> +void rproc_coredump_cleanup(struct rproc *rproc)
> +{
> +	struct rproc_dump_segment *entry, *tmp;
> +
> +	list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
> +		list_del(&entry->node);
> +		kfree(entry);
> +	}
> +}
> +
> +/**
> + * rproc_coredump_add_segment() - add segment of device memory to coredump
> + * @rproc:	handle of a remote processor
> + * @da:		device address
> + * @size:	size of segment
> + *
> + * Add device memory to the list of segments to be included in a coredump for
> + * the remoteproc.
> + *
> + * Return: 0 on success, negative errno on error.
> + */
> +int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size)
> +{
> +	struct rproc_dump_segment *segment;
> +
> +	segment = kzalloc(sizeof(*segment), GFP_KERNEL);
> +	if (!segment)
> +		return -ENOMEM;
> +
> +	segment->da = da;
> +	segment->size = size;
> +
> +	list_add_tail(&segment->node, &rproc->dump_segments);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(rproc_coredump_add_segment);
> +
> +/**
> + * rproc_coredump_add_custom_segment() - add custom coredump segment
> + * @rproc:	handle of a remote processor
> + * @da:		device address
> + * @size:	size of segment
> + * @dumpfn:	custom dump function called for each segment during coredump
> + * @priv:	private data
> + *
> + * Add device memory to the list of segments to be included in the coredump
> + * and associate the segment with the given custom dump function and private
> + * data.
> + *
> + * Return: 0 on success, negative errno on error.
> + */
> +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 *priv)
> +{
> +	struct rproc_dump_segment *segment;
> +
> +	segment = kzalloc(sizeof(*segment), GFP_KERNEL);
> +	if (!segment)
> +		return -ENOMEM;
> +
> +	segment->da = da;
> +	segment->size = size;
> +	segment->priv = priv;
> +	segment->dump = dumpfn;
> +
> +	list_add_tail(&segment->node, &rproc->dump_segments);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(rproc_coredump_add_custom_segment);
> +
> +/**
> + * rproc_coredump_set_elf_info() - set coredump elf information
> + * @rproc:	handle of a remote processor
> + * @class:	elf class for coredump elf file
> + * @machine:	elf machine for coredump elf file
> + *
> + * Set elf information which will be used for coredump elf file.
> + *
> + * Return: 0 on success, negative errno on error.
> + */
> +int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine)
> +{
> +	if (class != ELFCLASS64 && class != ELFCLASS32)
> +		return -EINVAL;
> +
> +	rproc->elf_class = class;
> +	rproc->elf_machine = machine;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(rproc_coredump_set_elf_info);
> +
> +/**
> + * 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.
> + */
> +void rproc_coredump(struct rproc *rproc)
> +{
> +	struct rproc_dump_segment *segment;
> +	void *phdr;
> +	void *ehdr;
> +	size_t data_size;
> +	size_t offset;
> +	void *data;
> +	void *ptr;
> +	u8 class = rproc->elf_class;
> +	int phnum = 0;
> +
> +	if (list_empty(&rproc->dump_segments))
> +		return;
> +
> +	if (class == ELFCLASSNONE) {
> +		dev_err(&rproc->dev, "Elf class is not set\n");
> +		return;
> +	}
> +
> +	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;
> +
> +		phnum++;
> +	}
> +
> +	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_phoff(class, ehdr, elf_size_of_hdr(class));
> +	elf_hdr_set_e_ehsize(class, ehdr, elf_size_of_hdr(class));
> +	elf_hdr_set_e_phentsize(class, ehdr, elf_size_of_phdr(class));
> +	elf_hdr_set_e_phnum(class, ehdr, phnum);
> +
> +	phdr = data + elf_hdr_get_e_phoff(class, ehdr);
> +	offset = elf_hdr_get_e_phoff(class, ehdr);
> +	offset += elf_size_of_phdr(class) * elf_hdr_get_e_phnum(class, ehdr);
> +
> +	list_for_each_entry(segment, &rproc->dump_segments, node) {
> +		memset(phdr, 0, elf_size_of_phdr(class));
> +		elf_phdr_set_p_type(class, phdr, PT_LOAD);
> +		elf_phdr_set_p_offset(class, phdr, offset);
> +		elf_phdr_set_p_vaddr(class, phdr, segment->da);
> +		elf_phdr_set_p_paddr(class, phdr, segment->da);
> +		elf_phdr_set_p_filesz(class, phdr, segment->size);
> +		elf_phdr_set_p_memsz(class, phdr, segment->size);
> +		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);
> +			}
> +		}
> +
> +		offset += elf_phdr_get_p_filesz(class, phdr);
> +		phdr += elf_size_of_phdr(class);
> +	}
> +
> +	dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
> +}
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index 4ba7cb5..97d441b 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -47,6 +47,10 @@ struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
>  int rproc_init_sysfs(void);
>  void rproc_exit_sysfs(void);
>  
> +/* from remoteproc_coredump.c */
> +void rproc_coredump_cleanup(struct rproc *rproc);
> +void rproc_coredump(struct rproc *rproc);
> +
>  void rproc_free_vring(struct rproc_vring *rvring);
>  int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
>  
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

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