linux-kernel - Re: [PATCH v6 6/7] ACPI/NUMA: Add log messages for memory ranges found in CEDT

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Message-ID: <20240430163253.00006c6e@Huawei.com>
Date: Tue, 30 Apr 2024 16:32:53 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Robert Richter <rrichter@....com>
CC: "Rafael J. Wysocki" <rafael@...nel.org>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Dan Williams <dan.j.williams@...el.com>,
	Alison Schofield <alison.schofield@...el.com>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>, Len Brown
	<lenb@...nel.org>
Subject: Re: [PATCH v6 6/7] ACPI/NUMA: Add log messages for memory ranges
 found in CEDT

On Tue, 30 Apr 2024 11:21:59 +0200
Robert Richter <rrichter@....com> wrote:

> Adding a pr_info() when successfully adding a CFMWS memory range.
> 
> Suggested-by: Alison Schofield <alison.schofield@...el.com>
> Signed-off-by: Robert Richter <rrichter@....com>

Hmm. I'm a bit doubtful this will work for other architectures
as arm64 at least has two sets of memblocks and the holes probably
want to go in memblock.reserved rather than in memblock.memory.
I think we would want to reflect where the extra memblks was added.

However. I'm not 100% sure on what that ends up like as I've not
written an appropriate numa_fill_memblks() yet, so I guess for
now it's fine here, and maybe it will get pushed into the arch
specific code when a second architecture implements numa_fill_memblks()
if some architectures want to return more detailed info.

So, I've argued myself around to
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Jonathan

p.s. Unrelated whitespace change but I guess can cope with that...

> ---
>  drivers/acpi/numa/srat.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
> index 76b39a6d3aef..34ecf2dc912f 100644
> --- a/drivers/acpi/numa/srat.c
> +++ b/drivers/acpi/numa/srat.c
> @@ -339,8 +339,12 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
>  	 * window.
>  	 */
>  	modified = numa_fill_memblks(start, end);
> -	if (modified != NUMA_NO_MEMBLK)
> +	if (modified != NUMA_NO_MEMBLK) {
> +		if (modified)
> +			pr_info("CEDT: memblk extended [mem %#010Lx-%#010Lx]\n",
> +				(unsigned long long) start, (unsigned long long) end - 1);
>  		return 0;
> +	}
>  
>  	/* No SRAT description. Create a new node. */
>  	node = acpi_map_pxm_to_node(*fake_pxm);
> @@ -355,8 +359,13 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
>  		pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n",
>  			node, start, end);
>  	}
> +
>  	node_set(node, numa_nodes_parsed);
>  
> +	pr_info("CEDT: Node %u PXM %u [mem %#010Lx-%#010Lx]\n",
> +		node, *fake_pxm,
> +		(unsigned long long) start, (unsigned long long) end - 1);
> +
>  	/* Set the next available fake_pxm value */
>  	(*fake_pxm)++;
>  	return 0;