Messages in this thread Patch in this message | | | Date | Fri, 1 Apr 2005 12:37:27 -0500 | From | Jason Davis <> | Subject | [PATCH] 2.6.12-rc1-mm4 x86_64 genapic update |
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Hello,
x86_64 genapic mechanism should be aware of machines that use physical APIC mode regardless of how many clusters/processors are detected. ACPI 3.0 FADT makes this determination very simple by providing a feature flag "force_apic_physical_destination_mode" to state whether the machine unconditionally uses physical APIC mode. Unisys' next generation x86_64 ES7000 will need to utilize this FADT feature flag in order to boot the x86_64 kernel in the correct APIC mode. This patch has been tested on both x86_64 commodity and ES7000 boxes.
Signed-off-by: Jason Davis <jason.davis@unisys.com>
diff -Naurp linux-2.6.12-rc1-mm4/arch/i386/kernel/acpi/boot.c linux-2.6.12-rc1-mm4-genapic/arch/i386/kernel/acpi/boot.c --- linux-2.6.12-rc1-mm4/arch/i386/kernel/acpi/boot.c 2005-03-02 02:38:25.000000000 -0500 +++ linux-2.6.12-rc1-mm4-genapic/arch/i386/kernel/acpi/boot.c 2005-03-31 18:15:09.606679144 -0500 @@ -608,6 +608,10 @@ static int __init acpi_parse_fadt(unsign acpi_fadt.sci_int = fadt->sci_int; #endif + /* initialize rev and apic_phys_dest_mode for x86_64 genapic */ + acpi_fadt.revision = fadt->revision; + acpi_fadt.force_apic_physical_destination_mode = fadt->force_apic_physical_destination_mode; + #ifdef CONFIG_X86_PM_TIMER /* detect the location of the ACPI PM Timer */ if (fadt->revision >= FADT2_REVISION_ID) { diff -Naurp linux-2.6.12-rc1-mm4/arch/x86_64/kernel/genapic.c linux-2.6.12-rc1-mm4-genapic/arch/x86_64/kernel/genapic.c --- linux-2.6.12-rc1-mm4/arch/x86_64/kernel/genapic.c 2005-03-02 02:38:37.000000000 -0500 +++ linux-2.6.12-rc1-mm4-genapic/arch/x86_64/kernel/genapic.c 2005-03-31 18:15:09.607678992 -0500 @@ -20,6 +20,10 @@ #include <asm/smp.h> #include <asm/ipi.h> +#if defined(CONFIG_ACPI_BUS) +#include <acpi/acpi_bus.h> +#endif + /* which logical CPU number maps to which CPU (physical APIC ID) */ u8 x86_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID }; EXPORT_SYMBOL(x86_cpu_to_apicid); @@ -47,6 +51,18 @@ void __init clustered_apic_check(void) goto print; } +#if defined(CONFIG_ACPI_BUS) + /* + * Some x86_64 machines use physical APIC mode regardless of how many + * procs/clusters are present (x86_64 ES7000 is an example). + */ + if (acpi_fadt.revision > FADT2_REVISION_ID) + if (acpi_fadt.force_apic_physical_destination_mode) { + genapic = &apic_cluster; + goto print; + } +#endif + memset(cluster_cnt, 0, sizeof(cluster_cnt)); for (i = 0; i < NR_CPUS; i++) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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