From: Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>
To: Sourabh Jain <sourabhjain@linux.ibm.com>, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org, hbathini@linux.ibm.com
Subject: Re: [PATCH] powerpc/fadump: sysfs for fadump memory reservation
Date: Tue, 6 Aug 2019 16:26:00 +0530 [thread overview]
Message-ID: <2285b7db-b3eb-6f4d-28f8-a3b740ab6e87@linux.vnet.ibm.com> (raw)
In-Reply-To: <20190806031242.30749-1-sourabhjain@linux.ibm.com>
On 8/6/19 8:42 AM, Sourabh Jain wrote:
> Add a sys interface to allow querying the memory reserved by fadump
> for saving the crash dump.
>
> Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Looks good to me.
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Thanks,
-Mahesh.
> ---
> Documentation/powerpc/firmware-assisted-dump.rst | 5 +++++
> arch/powerpc/kernel/fadump.c | 14 ++++++++++++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/Documentation/powerpc/firmware-assisted-dump.rst b/Documentation/powerpc/firmware-assisted-dump.rst
> index 9ca12830a48e..4a7f6dc556f5 100644
> --- a/Documentation/powerpc/firmware-assisted-dump.rst
> +++ b/Documentation/powerpc/firmware-assisted-dump.rst
> @@ -222,6 +222,11 @@ Here is the list of files under kernel sysfs:
> be handled and vmcore will not be captured. This interface can be
> easily integrated with kdump service start/stop.
>
> +/sys/kernel/fadump_mem_reserved
> +
> + This is used to display the memory reserved by fadump for saving the
> + crash dump.
> +
> /sys/kernel/fadump_release_mem
> This file is available only when fadump is active during
> second kernel. This is used to release the reserved memory
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index 4eab97292cc2..70d49013ebec 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -1514,6 +1514,13 @@ static ssize_t fadump_enabled_show(struct kobject *kobj,
> return sprintf(buf, "%d\n", fw_dump.fadump_enabled);
> }
>
> +static ssize_t fadump_mem_reserved_show(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + char *buf)
> +{
> + return sprintf(buf, "%ld\n", fw_dump.reserve_dump_area_size);
> +}
> +
> static ssize_t fadump_register_show(struct kobject *kobj,
> struct kobj_attribute *attr,
> char *buf)
> @@ -1632,6 +1639,9 @@ static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled,
> static struct kobj_attribute fadump_register_attr = __ATTR(fadump_registered,
> 0644, fadump_register_show,
> fadump_register_store);
> +static struct kobj_attribute fadump_mem_reserved_attr =
> + __ATTR(fadump_mem_reserved, 0444,
> + fadump_mem_reserved_show, NULL);
>
> DEFINE_SHOW_ATTRIBUTE(fadump_region);
>
> @@ -1663,6 +1673,10 @@ static void fadump_init_files(void)
> printk(KERN_ERR "fadump: unable to create sysfs file"
> " fadump_release_mem (%d)\n", rc);
> }
> + rc = sysfs_create_file(kernel_kobj, &fadump_mem_reserved_attr.attr);
> + if (rc)
> + pr_err("unable to create sysfs file fadump_mem_reserved (%d)\n",
> + rc);
> return;
> }
>
next prev parent reply other threads:[~2019-08-06 10:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 3:12 [PATCH] powerpc/fadump: sysfs for fadump memory reservation Sourabh Jain
2019-08-06 10:56 ` Mahesh Jagannath Salgaonkar [this message]
2019-08-07 3:10 ` Michael Ellerman
2019-08-08 5:43 ` Sourabh Jain
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