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x86: UV runtime bios calls

Russ Anderson lkml 1 version In review

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  1. v1 Latest4 patches 1 replyIn review

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/4x86: Add UV EFI table entryarch/x86/kernel/efi.c+4 -00 replies
2/4x86: Add UV bios call infrastructurearch/x86/kernel/bios_uv.c arch/x86/kernel/genx2apic_uv_x.c include/asm-x86/uv/bios.h+117 -480 replies
3/4x86: Add UV partition callarch/x86/kernel/bios_uv.c arch/x86/kernel/genx2apic_uv_x.c include/asm-x86/uv/bios.h+76 -200 replies
4/4x86: Add sysfs entries for UVarch/x86/kernel/Makefile arch/x86/kernel/uv_sysfs.c include/asm-x86/uv/bios.h+64 -11 reply

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Cover letter [PATCH 0/4] x86: UV runtime bios calls

[PATCH 0/4] x86: UV runtime bios calls

Purpose:
Create an interface to allow calls into bios to return platform specific information. The interface uses EFI SAL table entry. EFI provides a mechanism for defining function pointers to firmware routines. This patchset builds on the EFI mechanism to provide access to those firmware routines.

Patches:
uv_efi_bios: Look for SAL entry in EFI tables.

uv_bios_common: Add the EFI callback function using the EFI table
entry. Create associated wrapper code. Initialize SAL system table entry info at boot time.

uv_bios_call_partition: Add call to get partitioning related info.

uv_sysfs: Create sysfs entrys in /sys/firmware/sgi_uv/ for
partitioning related information.

Implementation comments:

This patch uses sal_systab. sal_systab is used on ia64, but was not used on x86. An alternative would be to create a new EFI entry type (uv_systab), though that would require adding to struct efi.

The location in sysfs (/sys/firmware/sgi_uv/) is based on community feedback.

If EFI is not configured (CONFIG_EFI), the calls will return -ENOSYS. If run on a system with a bios that does not supportes EFI SAL, the calls will return -ENOSYS.

Paul Jackson assisted in the development of this code.

Signature · 2 lines
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          [email protected]

Read the cover letter in its thread