x86/apic: Add separate apic_id_valid() functions for selected apic drivers

As suggested by Suresh Siddha and Yinghai Lu:

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() path so that
apic_id_valid() checking will be sufficient during MADT and SRAT
parsing.

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@numascale.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Daniel J Blueman <daniel@numascale-asia.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Jack Steiner <steiner@sgi.com>
Link: http://lkml.kernel.org/r/1331925935-13372-1-git-send-email-sp@numascale.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index a9371c9..d3eaac4 100644 (file)
--- 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 (file)
--- 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 406ed77..0f42c2f 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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;