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Date: Wed, 20 Mar 2024 10:47:48 -0700
From: Alison Schofield <alison.schofield@intel.com>
To: Robert Richter <rrichter@amd.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>, linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org,
	Len Brown <lenb@kernel.org>
Subject: Re: [PATCH v2 2/3] ACPI/NUMA: Print CXL Early Discovery Table (CEDT)
Message-ID: <ZfshRI/xAbSLJDQT@aschofie-mobl2>
References: <20240319120026.2246389-1-rrichter@amd.com>
 <20240319120026.2246389-3-rrichter@amd.com>
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In-Reply-To: <20240319120026.2246389-3-rrichter@amd.com>

On Tue, Mar 19, 2024 at 01:00:24PM +0100, Robert Richter wrote:
> The CEDT contains similar entries as the SRAT. For diagnostic reasons
> print the CEDT same style as the SRAT.

Richard,

Acpitools is not properly handling the CFMWS at the moment. When
that gets fixed up, might you be good using acpidump/extract.

If you're going to dump, how about dumping it all? Add the fields
interleave arithmetic, qtg_id, xormap_list[].

While debugging issues in this space I have wished for more info
like this:

1) acpi_parse_cfmws()  pr_warn's upon failure to add a node but is 
quiet on success. A pr_info on success, showing that a new memblk
and node was added would be useful.

2) numa_add_memblks() if memblk was extended pr_info the info.

If you can incorporate here, great!

Thanks,
Alison


> 
> Signed-off-by: Robert Richter <rrichter@amd.com>
> ---
>  drivers/acpi/numa/srat.c | 112 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 112 insertions(+)
> 
> diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
> index e45e64993c50..50ae8557e8d1 100644
> --- a/drivers/acpi/numa/srat.c
> +++ b/drivers/acpi/numa/srat.c
> @@ -300,6 +300,114 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>  	return -EINVAL;
>  }
>  
> +static int __init
> +__acpi_table_print_cedt_entry(union acpi_subtable_headers *__header,
> +			      void *arg, const unsigned long table_end)
> +{
> +	struct acpi_cedt_header *header = (struct acpi_cedt_header *)__header;
> +
> +	switch (header->type) {
> +	case ACPI_CEDT_TYPE_CHBS:
> +		{
> +			struct acpi_cedt_chbs *p =
> +				(struct acpi_cedt_chbs *)header;
> +
> +			if (header->length < sizeof(struct acpi_cedt_chbs)) {
> +				pr_warn("CEDT: unsupported CHBS entry: size %d\n",
> +					 header->length);
> +				break;
> +			}
> +
> +			pr_info("CEDT: CHBS (0x%llx length 0x%llx uid %lu) %s (%d)\n",
> +				 (unsigned long long)p->base,
> +				 (unsigned long long)p->length,
> +				 (unsigned long)p->uid,
> +				 (p->cxl_version == ACPI_CEDT_CHBS_VERSION_CXL11) ?
> +				 "cxl11" :
> +				 (p->cxl_version == ACPI_CEDT_CHBS_VERSION_CXL20) ?
> +				 "cxl20" :
> +				 "unsupported version",
> +				 p->cxl_version);
> +		}
> +		break;
> +	case ACPI_CEDT_TYPE_CFMWS:
> +		{
> +			struct acpi_cedt_cfmws *p =
> +				(struct acpi_cedt_cfmws *)header;
> +			int eiw_to_ways[] = {1, 2, 4, 8, 16, 3, 6, 12};
> +			int targets = -1;
> +
> +			if (header->length < sizeof(struct acpi_cedt_cfmws)) {
> +				pr_warn("CEDT: unsupported CFMWS entry: size %d\n",
> +					header->length);
> +				break;
> +			}
> +
> +			if (p->interleave_ways < ARRAY_SIZE(eiw_to_ways))
> +				targets = eiw_to_ways[p->interleave_ways];
> +			if (header->length < struct_size(
> +					p, interleave_targets, targets))
> +				targets = -1;
> +
> +			pr_info("CEDT: CFMWS (0x%llx length 0x%llx) with %d target%s",
> +				(unsigned long long)p->base_hpa,
> +				(unsigned long long)p->window_size,
> +				targets, targets > 1 ? "s" : "");
> +			for (int i = 0; i < targets; i++)
> +				pr_cont("%s%lu", i ? ", " : " (",
> +					(unsigned long)p->interleave_targets[i]);
> +			pr_cont("%s%s%s%s%s%s\n",
> +				targets > 0 ? ")" : "",
> +				(p->restrictions & ACPI_CEDT_CFMWS_RESTRICT_TYPE2) ?
> +				" type2" : "",
> +				(p->restrictions & ACPI_CEDT_CFMWS_RESTRICT_TYPE3) ?
> +				" type3" : "",
> +				(p->restrictions & ACPI_CEDT_CFMWS_RESTRICT_VOLATILE) ?
> +				" volatile" : "",
> +				(p->restrictions & ACPI_CEDT_CFMWS_RESTRICT_PMEM) ?
> +				" pmem" : "",
> +				(p->restrictions & ACPI_CEDT_CFMWS_RESTRICT_FIXED) ?
> +				" fixed" : "");
> +		}
> +		break;
> +	case ACPI_CEDT_TYPE_CXIMS:
> +		{
> +			struct acpi_cedt_cxims *p =
> +				(struct acpi_cedt_cxims *)header;
> +
> +			if (header->length < sizeof(struct acpi_cedt_cxims)) {
> +				pr_warn("CEDT: unsupported CXIMS entry: size %d\n",
> +					header->length);
> +				break;
> +			}
> +
> +			pr_info("CEDT: CXIMS (hbig %u nr_xormaps %u)\n",
> +				 (unsigned int)p->hbig,
> +				 (unsigned int)p->nr_xormaps);
> +		}
> +		break;
> +	default:
> +		pr_warn("CEDT: Found unsupported entry (type = 0x%x)\n",
> +			header->type);
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
> +static void __init acpi_table_print_cedt_entry(enum acpi_cedt_type id)
> +{
> +	acpi_table_parse_cedt(id, __acpi_table_print_cedt_entry, NULL);
> +}
> +
> +static void __init acpi_table_print_cedt(void)
> +{
> +	/* Print only implemented CEDT types */
> +	acpi_table_print_cedt_entry(ACPI_CEDT_TYPE_CHBS);
> +	acpi_table_print_cedt_entry(ACPI_CEDT_TYPE_CFMWS);
> +	acpi_table_print_cedt_entry(ACPI_CEDT_TYPE_CXIMS);
> +}
> +
>  static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
>  				   void *arg, const unsigned long table_end)
>  {
> @@ -341,6 +449,7 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
>  	return 0;
>  }
>  #else
> +static inline void acpi_table_print_cedt(void) {}
>  static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
>  				   void *arg, const unsigned long table_end)
>  {
> @@ -526,6 +635,9 @@ int __init acpi_numa_init(void)
>  	/* SLIT: System Locality Information Table */
>  	acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
>  
> +	/* CEDT: CXL Early Discovery Table */
> +	acpi_table_print_cedt();
> +
>  	/*
>  	 * CXL Fixed Memory Window Structures (CFMWS) must be parsed
>  	 * after the SRAT. Create NUMA Nodes for CXL memory ranges that
> -- 
> 2.39.2
>