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Date: Fri, 28 Mar 2008 14:11:56 -0500 From: Jack Steiner <steiner@....com> To: mingo@...e.hu, tglx@...utronix.de Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: [PATCH 0/8] - Support for UV platform This series of patches add x86_64 support for the SGI "UV" platform. Most of the changes are related to support for larger apic IDs and new chipset hardware that is used for sending IPIs, etc. UV supports really big systems. So big, in fact, that the APICID register does not contain enough bits to contain an APICID that is unique across all cpus. The UV BIOS supports 3 APICID modes: - legacy mode. This mode uses the old APIC mode where APICID is in bits [31:24] of the APICID register. - x2apic mode. This mode is whitebox-compatible. APICIDs are unique across all cpus. Standard x2apic APIC operations (Intel-defined) can be used for IPIs. The node identifier fits within the Intel-defined portion of the APICID register. - x2apic-uv mode. In this mode, the APICIDs on each node have unique IDs, but IDs on different node are not unique. For example, if each mode has 32 cpus, the APICIDs on each node might be 0 - 31. Every node has the same set of IDs. The UV hub is used to route IPIs/interrupts to the correct node. Traditional APIC IPI operations WILL NOT WORK. In x2apic-uv mode, the ACPI tables all contain a full unique ID: nnnnnnnnnnlc0cch n = unique node number l = socket number on board c = core h = hyperthread Only the "c0cch" bits are written to the APICID register. The remaining bits are supplied by having the get_apic_id() function "OR" the extra bits into the value read from the APICID register. The x2apic-uv mode is recognized by <oem_id> & <oem_table_id> fields of the MADT table. Significant changes from V1: - fixed issues raised in review of the first patch - move uv header files to asm-x86/uv - deleted support for using UV header files in BIOS - Add WARN if reading apicid w/o disabling preemption (& fixed places that hit the WARN) - added _GPL to exports - deleted some debug code - reworked the macros/functions for reading the APIC_ID. This was necessary because several of the apic-related files that use to be separate for -32 and -64 have been combined. - added null macros for -32 for is_uv_system() - fixed a couple of compile bugs for 32-bit kernels Remaining issues that will be addressed later - smpboot_32.c & smpboot_64.c were recently combined. I pulled the code from this patch that is needed to start slave cpus when running in x2apic-uv mode because it collided to too much 32-bit code. I'll add this again in a subsequent patch. The current code fully supports legacy (& x2apic mode once the Intel x2apic patch is available) - that is good enough for now. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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