linux-kernel - Re: [RFC PATCH v2 2/3] drivers/nvdimm: export memmap of namespace to vmcoreinfo

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Date:   Thu, 27 Apr 2023 15:50:17 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Li Zhijian <lizhijian@...itsu.com>, <x86@...nel.org>,
        <nvdimm@...ts.linux.dev>, <kexec@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>, <y-goto@...itsu.com>,
        <yangx.jy@...itsu.com>, <ruansy.fnst@...itsu.com>,
        Li Zhijian <lizhijian@...itsu.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Vishal Verma" <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Ira Weiny" <ira.weiny@...el.com>
Subject: Re: [RFC PATCH v2 2/3] drivers/nvdimm: export memmap of namespace to
 vmcoreinfo

Li Zhijian wrote:
> Each namespace has its own memmap, it will be udpated when
> namespace initializing/creating, updating, and deleting.
> 
> CC: Dan Williams <dan.j.williams@...el.com>
> CC: Vishal Verma <vishal.l.verma@...el.com>
> CC: Dave Jiang <dave.jiang@...el.com>
> CC: Ira Weiny <ira.weiny@...el.com>
> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
> ---
>  drivers/nvdimm/namespace_devs.c | 2 ++
>  drivers/nvdimm/pfn_devs.c       | 3 +++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index c60ec0b373c5..096203e6203f 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -8,6 +8,7 @@
>  #include <linux/slab.h>
>  #include <linux/list.h>
>  #include <linux/nd.h>
> +#include <linux/crash_core.h>
>  #include "nd-core.h"
>  #include "pmem.h"
>  #include "pfn.h"
> @@ -853,6 +854,7 @@ static ssize_t size_store(struct device *dev,
>  	if (rc == 0 && val == 0 && is_namespace_pmem(dev)) {
>  		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
>  
> +		devm_memmap_vmcore_delete(to_ndns(dev));

This seems like an odd place to put this.  Could you explain the reasoning
more?

Ira

>  		kfree(nspm->uuid);
>  		nspm->uuid = NULL;
>  	}
> diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
> index af7d9301520c..80076996b2da 100644
> --- a/drivers/nvdimm/pfn_devs.c
> +++ b/drivers/nvdimm/pfn_devs.c
> @@ -9,6 +9,7 @@
>  #include <linux/slab.h>
>  #include <linux/fs.h>
>  #include <linux/mm.h>
> +#include <linux/crash_core.h>
>  #include "nd-core.h"
>  #include "pfn.h"
>  #include "nd.h"
> @@ -716,6 +717,8 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
>  	} else
>  		return -ENXIO;
>  
> +	devm_memmap_vmcore_update(ndns, altmap->base_pfn, PHYS_PFN(offset),
> +				  nd_pfn->mode == PFN_MODE_PMEM);
>  	return 0;
>  }
>  
> -- 
> 2.29.2
>