On 22/07/17 04:54, Hanjun Guo wrote:
> From: Hanjun Guo <hanjun....@linaro.org>
>
> When running 4.13-rc1 on top of D05, I got the boot log:
>
> [ 0.000000] SRAT: PXM 0 -> ITS 0 -> Node 0
> [ 0.000000] SRAT: PXM 0 -> ITS 1 -> Node 0
> [ 0.000000] SRAT: PXM 0 -> ITS 2 -> Node 0
> [ 0.000000] SRAT: PXM 1 -> ITS 3 -> Node 1
> [ 0.000000] SRAT: ITS affinity exceeding max count[4]
>
> This is wrong on D05 as we have 8 ITSes with 4 NUMA nodes.
>
> So dynamically alloc the memory needed instead of using
> its_srat_maps[MAX_NUMNODES], which count the number of
> ITS entry(ies) in SRAT and alloc its_srat_maps as needed,
> then build the mapping of numa node to ITS ID. Of course,
> its_srat_maps will be freed after ITS probing because
> we don't need that after boot.
>
> After doing this, I got what I wanted:
>
> [ 0.000000] SRAT: PXM 0 -> ITS 0 -> Node 0
> [ 0.000000] SRAT: PXM 0 -> ITS 1 -> Node 0
> [ 0.000000] SRAT: PXM 0 -> ITS 2 -> Node 0
> [ 0.000000] SRAT: PXM 1 -> ITS 3 -> Node 1
> [ 0.000000] SRAT: PXM 2 -> ITS 4 -> Node 2
> [ 0.000000] SRAT: PXM 2 -> ITS 5 -> Node 2
> [ 0.000000] SRAT: PXM 2 -> ITS 6 -> Node 2
> [ 0.000000] SRAT: PXM 3 -> ITS 7 -> Node 3
>
> Fixes: dbd2b8267233 ("irqchip/gic-v3-its: Add ACPI NUMA node mapping")
> Signed-off-by: Hanjun Guo <hanjun....@linaro.org>
> Cc: Ganapatrao Kulkarni <ganapatrao.kulka...@cavium.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
> Cc: Marc Zyngier <marc.zyng...@arm.com>
> ---
>
> v1->v2:
> - Add NULL check in acpi_get_its_numa_node() for no ITS affinity case;
> - Free the its_srat_maps after ITS probing.
>
> drivers/irqchip/irq-gic-v3-its.c | 39 ++++++++++++++++++++++++++++++++-------
> 1 file changed, 32 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic-v3-its.c
> b/drivers/irqchip/irq-gic-v3-its.c
> index 3ccdf76..1d692aa 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -1847,13 +1847,16 @@ struct its_srat_map {
> u32 its_id;
> };
>
> -static struct its_srat_map its_srat_maps[MAX_NUMNODES] __initdata;
> +static struct its_srat_map *its_srat_maps __initdata;
> static int its_in_srat __initdata;
>
> static int __init acpi_get_its_numa_node(u32 its_id)
> {
> int i;
>
> + if (!its_srat_maps)
> + return NUMA_NO_NODE;
> +
> for (i = 0; i < its_in_srat; i++) {
> if (its_id == its_srat_maps[i].its_id)
> return its_srat_maps[i].numa_node;
> @@ -1861,6 +1864,12 @@ static int __init acpi_get_its_numa_node(u32 its_id)
> return NUMA_NO_NODE;
> }
>
> +static int __init gic_acpi_match_srat_its(struct acpi_subtable_header
> *header,
> + const unsigned long end)
> +{
> + return 0;
> +}
> +
> static int __init gic_acpi_parse_srat_its(struct acpi_subtable_header
> *header,
> const unsigned long end)
> {
> @@ -1877,12 +1886,6 @@ static int __init gic_acpi_parse_srat_its(struct
> acpi_subtable_header *header,
> return -EINVAL;
> }
>
> - if (its_in_srat >= MAX_NUMNODES) {
> - pr_err("SRAT: ITS affinity exceeding max count[%d]\n",
> - MAX_NUMNODES);
> - return -EINVAL;
> - }
> -
So you're getting rid of that message when overflowing the array...
> node = acpi_map_pxm_to_node(its_affinity->proximity_domain);
>
> if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
> @@ -1901,14 +1904,35 @@ static int __init gic_acpi_parse_srat_its(struct
> acpi_subtable_header *header,
>
> static void __init acpi_table_parse_srat_its(void)
> {
> + int count;
> +
> + count = acpi_table_parse_entries(ACPI_SIG_SRAT,
> + sizeof(struct acpi_table_srat),
> + ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
> + gic_acpi_match_srat_its, 0);
> + if (count <= 0)
> + return;
> +
> + its_srat_maps = kmalloc(count * sizeof(struct its_srat_map),
> + GFP_KERNEL);
> + if (!its_srat_maps)
> + return;
and here silently returning when failing to allocate the memory. I think
it'd be worth having a bit of a warning.
> +
> acpi_table_parse_entries(ACPI_SIG_SRAT,
> sizeof(struct acpi_table_srat),
> ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
> gic_acpi_parse_srat_its, 0);
> }
> +
> +/* free the its_srat_maps after ITS probing */
> +static void __init acpi_its_srat_maps_free(void)
> +{
> + kfree(its_srat_maps);
> +}
> #else
> static void __init acpi_table_parse_srat_its(void) { }
> static int __init acpi_get_its_numa_node(u32 its_id) { return NUMA_NO_NODE; }
> +static void __init acpi_its_srat_maps_free(void) { }
> #endif
>
> static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header
> *header,
> @@ -1955,6 +1979,7 @@ 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);
> + acpi_its_srat_maps_free();
> }
> #else
> static void __init its_acpi_probe(void) { }
>
Otherwise looks good.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
