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Date: Tue, 20 Mar 2012 11:41:44 +0100
From: Steffen Persvold <sp@...ascale.com>
To: Ingo Molnar <mingo@...hat.com>
CC: Suresh Siddha <suresh.b.siddha@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Daniel J Blueman <daniel@...ascale-asia.com>,
Yinghai Lu <yinghai@...nel.org>,
Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
x86@...nel.org
Subject: Re: [PATCH REPOST] Added separate apic_id_valid() functions for selected
apic drivers.
On 3/16/2012 20:25, Steffen Persvold wrote:
> As suggested by Suresh Siddha<suresh.b.siddha@...el.com> and Yinghai Lu<yinghai@...nel.org> :
>
> For x2apic pre-enabled systems, apic driver is set already early through early_acpi_boot_init()/early_acpi_process_madt()/acpi_parse_madt()/default_acpi_madt_oem_check() so that apic_id_valid() checking will be sufficient during MADT and SRAT prasing. For non- x2apic pre-enabled systems, all apic ids should be less than 255.
>
> This allows us to substitute the checks in arch/x86/kernel/acpi/boot.c::acpi_parse_x2apic() and arch/x86/mm/srat.c::acpi_numa_x2apic_affinity_init() with apic->apic_id_valid().
>
> In addition we can avoid feigning the x2apic cpu feature in the NumaChip apic code.
>
> The following apic drivers have separate apic_id_valid() functions which will accept x2apic type IDs :
>
> x2apic_phys
> x2apic_cluster
> x2apic_uv_x
> apic_numachip
>
> Signed-off-by: Steffen Persvold<sp@...ascale.com>
Ingo, any comments on this approach ? It should cover both cases as
suggested by Suresh and Yinghai.
Kind regards,
--
Steffen Persvold, Chief Architect NumaChip
Numascale AS - www.numascale.com
Tel: +47 92 49 25 54 Skype: spersvold
> ---
> arch/x86/include/asm/apic.h | 2 +-
> arch/x86/include/asm/x2apic.h | 5 +++++
> arch/x86/kernel/acpi/boot.c | 2 +-
> arch/x86/kernel/apic/apic_numachip.c | 3 +--
> arch/x86/kernel/apic/x2apic_cluster.c | 2 +-
> arch/x86/kernel/apic/x2apic_phys.c | 2 +-
> arch/x86/kernel/apic/x2apic_uv_x.c | 7 ++++++-
> arch/x86/mm/srat.c | 2 +-
> 8 files changed, 17 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
> index a9371c9..d3eaac4 100644
> --- a/arch/x86/include/asm/apic.h
> +++ b/arch/x86/include/asm/apic.h
> @@ -535,7 +535,7 @@ static inline unsigned int read_apic_id(void)
>
> static inline int default_apic_id_valid(int apicid)
> {
> - return x2apic_mode || (apicid< 255);
> + return (apicid< 255);
> }
>
> extern void default_setup_apic_routing(void);
> diff --git a/arch/x86/include/asm/x2apic.h b/arch/x86/include/asm/x2apic.h
> index 6bf5b8e..92e54ab 100644
> --- a/arch/x86/include/asm/x2apic.h
> +++ b/arch/x86/include/asm/x2apic.h
> @@ -18,6 +18,11 @@ static const struct cpumask *x2apic_target_cpus(void)
> return cpu_online_mask;
> }
>
> +static int x2apic_apic_id_valid(int apicid)
> +{
> + return 1;
> +}
> +
> static int x2apic_apic_id_registered(void)
> {
> return 1;
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index ce664f3..4b5059c 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -239,7 +239,7 @@ acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
> * to not preallocating memory for all NR_CPUS
> * when we use CPU hotplug.
> */
> - if (!cpu_has_x2apic&& (apic_id>= 0xff)&& enabled)
> + if (!apic->apic_id_valid(apic_id)&& enabled)
> printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
> else
> acpi_register_lapic(apic_id, enabled);
> diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
> index d9ea5f3..899803e 100644
> --- a/arch/x86/kernel/apic/apic_numachip.c
> +++ b/arch/x86/kernel/apic/apic_numachip.c
> @@ -229,11 +229,10 @@ static int __init numachip_system_init(void)
> }
> early_initcall(numachip_system_init);
>
> -static int __cpuinit numachip_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
> +static int numachip_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
> {
> if (!strncmp(oem_id, "NUMASC", 6)) {
> numachip_system = 1;
> - setup_force_cpu_cap(X86_FEATURE_X2APIC);
> return 1;
> }
>
> diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
> index 9193713..48f3103 100644
> --- a/arch/x86/kernel/apic/x2apic_cluster.c
> +++ b/arch/x86/kernel/apic/x2apic_cluster.c
> @@ -213,7 +213,7 @@ static struct apic apic_x2apic_cluster = {
> .name = "cluster x2apic",
> .probe = x2apic_cluster_probe,
> .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
> - .apic_id_valid = default_apic_id_valid,
> + .apic_id_valid = x2apic_apic_id_valid,
> .apic_id_registered = x2apic_apic_id_registered,
>
> .irq_delivery_mode = dest_LowestPrio,
> diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
> index bcd1db6..8a778db 100644
> --- a/arch/x86/kernel/apic/x2apic_phys.c
> +++ b/arch/x86/kernel/apic/x2apic_phys.c
> @@ -119,7 +119,7 @@ static struct apic apic_x2apic_phys = {
> .name = "physical x2apic",
> .probe = x2apic_phys_probe,
> .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
> - .apic_id_valid = default_apic_id_valid,
> + .apic_id_valid = x2apic_apic_id_valid,
> .apic_id_registered = x2apic_apic_id_registered,
>
> .irq_delivery_mode = dest_Fixed,
> diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
> index fc47714..87bfa69 100644
> --- a/arch/x86/kernel/apic/x2apic_uv_x.c
> +++ b/arch/x86/kernel/apic/x2apic_uv_x.c
> @@ -266,6 +266,11 @@ static void uv_send_IPI_all(int vector)
> uv_send_IPI_mask(cpu_online_mask, vector);
> }
>
> +static int uv_apic_id_valid(int apicid)
> +{
> + return 1;
> +}
> +
> static int uv_apic_id_registered(void)
> {
> return 1;
> @@ -351,7 +356,7 @@ static struct apic __refdata apic_x2apic_uv_x = {
> .name = "UV large system",
> .probe = uv_probe,
> .acpi_madt_oem_check = uv_acpi_madt_oem_check,
> - .apic_id_valid = default_apic_id_valid,
> + .apic_id_valid = uv_apic_id_valid,
> .apic_id_registered = uv_apic_id_registered,
>
> .irq_delivery_mode = dest_Fixed,
> diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
> index 1c1c4f4..efb5b4b 100644
> --- a/arch/x86/mm/srat.c
> +++ b/arch/x86/mm/srat.c
> @@ -70,7 +70,7 @@ acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
> return;
> pxm = pa->proximity_domain;
> apic_id = pa->apic_id;
> - if (!cpu_has_x2apic&& (apic_id>= 0xff)) {
> + if (!apic->apic_id_valid(apic_id)) {
> printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
> pxm, apic_id);
> return;
--
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