Hi Ganapatrao,
On Tue, Jun 20, 2017 at 12:37:17PM +0530, Ganapatrao Kulkarni wrote:
> Add code to parse SRAT ITS Affinity sub table as defined in ACPI 6.2
> Later in per device probe, ITS devices are mapped to
> numa node using ITS id to proximity domain mapping.
>
> Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@xxxxxxxxxx>
> ---
> drivers/irqchip/irq-gic-v3-its.c | 76 +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 75 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 45ea1933..5865a75 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -1833,6 +1833,78 @@ static int __init its_of_probe(struct device_node *node)
>
> #define ACPI_GICV3_ITS_MEM_SIZE (SZ_128K)
>
> +#ifdef CONFIG_ACPI_NUMA
> +struct its_srat_map {
> + u32 numa_node; /* numa node id */
> + u32 its_id; /* GIC ITS ID */
> + struct list_head entry;
> +};
> +
> +static LIST_HEAD(its_srat_maps);
> +
> +static int acpi_get_its_numa_node(u32 its_id)
> +{
> + struct its_srat_map *srat_map;
> +
> + list_for_each_entry(srat_map, &its_srat_maps, entry) {
> + if (its_id == srat_map->its_id)
> + return srat_map->numa_node;
> + }
> + return NUMA_NO_NODE;
> +}
I do not want to come across as pedantic and I understand that the API
to parse static ACPI tables sucks (ie in theory you could avoid stashing
nodes altogether and just use a global variable to parse an ITS ID at
a time but it sucks to go through the SRAT multiple times) but would not
it be easier to just declare an __initdata static array and counter and
be done with this ? We do not need this stuff after boot so I do not see
a point in keeping it in memory and in allocating the nodes dynamically.
Apologies if I was not clear in my comments to the previous set, I did
not like stashing ITS PXM values in arch/arm64 code but I understand you
need an array (__initdata) to avoid reading the SRAT multiple times.
Thanks,
Lorenzo
> +
> +static int __init
> +gic_acpi_parse_srat_its(struct acpi_subtable_header *header,
> + const unsigned long end)
> +{
> + int pxm, node;
> + struct its_srat_map *srat_map;
> + struct acpi_srat_its_affinity *its_affinity;
> +
> + its_affinity = (struct acpi_srat_its_affinity *)header;
> + if (!its_affinity)
> + return -EINVAL;
> +
> + if (its_affinity->header.length <
> + sizeof(struct acpi_srat_its_affinity)) {
> + pr_err("SRAT:ITS: Invalid SRAT header length: %d\n",
> + its_affinity->header.length);
> + return -EINVAL;
> + }
> +
> + pxm = its_affinity->proximity_domain;
> + node = acpi_map_pxm_to_node(pxm);
> +
> + if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
> + pr_err("SRAT:ITS Invalid numa node %d\n", node);
> + return -EINVAL;
> + }
> +
> + srat_map = kzalloc(sizeof(*srat_map), GFP_KERNEL);
> + if (!srat_map)
> + return -ENOMEM;
> +
> + srat_map->numa_node = node;
> + srat_map->its_id = its_affinity->its_id;
> + list_add(&srat_map->entry, &its_srat_maps);
> + pr_info("ACPI: NUMA: SRAT: ITS: PXM %d -> ITS_ID %d -> NODE %d\n",
> + srat_map->its_id, pxm, node);
> +
> + return 0;
> +}
> +
> +static int __init acpi_table_parse_srat_its(void)
> +{
> + return acpi_table_parse_entries(ACPI_SIG_SRAT,
> + sizeof(struct acpi_table_srat),
> + ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
> + gic_acpi_parse_srat_its, 0);
> +}
> +#else
> +#define acpi_table_parse_srat_its(void) { }
> +#define acpi_get_its_numa_node(its_id) NUMA_NO_NODE
> +#endif
> +
> static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
> const unsigned long end)
> {
> @@ -1861,7 +1933,8 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
> goto dom_err;
> }
>
> - err = its_probe_one(&res, dom_handle, NUMA_NO_NODE);
> + err = its_probe_one(&res, dom_handle,
> + acpi_get_its_numa_node(its_entry->translation_id));
> if (!err)
> return 0;
>
> @@ -1873,6 +1946,7 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
>
> static void __init its_acpi_probe(void)
> {
> + acpi_table_parse_srat_its();
> acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
> gic_acpi_parse_madt_its, 0);
> }
> --
> 1.8.1.4
>
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