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| author | Kevin D. Kissell <kevink@mips.com> | 2007-07-12 16:21:08 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-07-12 17:41:17 +0100 |
| commit | 0db34215c7e0ef618e7b29fbf271194ca5434f8e (patch) | |
| tree | 261d8cd77fad2d661157ee5e5bde8e3fdc8c96b9 /arch/mips/Kconfig | |
| parent | bd0765098bf22eb8b1319f649a4c3301b40ec04c (diff) | |
| download | lwn-0db34215c7e0ef618e7b29fbf271194ca5434f8e.tar.gz lwn-0db34215c7e0ef618e7b29fbf271194ca5434f8e.zip | |
[MIPS] SMTC: Interrupt mask backstop hack
To support multiple TC microthreads acting as "CPUs" within a VPE,
VPE-wide interrupt mask bits must be specially manipulated during
interrupt handling. To support legacy drivers and interrupt controller
management code, SMTC has a "backstop" to track and if necessary restore
the interrupt mask. This has some performance impact on interrupt service
overhead. Disable it only if you know what you are doing.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index a00fabe2e4e0..49f02e351244 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1404,6 +1404,19 @@ config MIPS_MT_SMTC_INSTANT_REPLAY it off), but ensures that IPIs are handled promptly even under heavy I/O interrupt load. +config MIPS_MT_SMTC_IM_BACKSTOP + bool "Use per-TC register bits as backstop for inhibited IM bits" + depends on MIPS_MT_SMTC + default y + help + To support multiple TC microthreads acting as "CPUs" within + a VPE, VPE-wide interrupt mask bits must be specially manipulated + during interrupt handling. To support legacy drivers and interrupt + controller management code, SMTC has a "backstop" to track and + if necessary restore the interrupt mask. This has some performance + impact on interrupt service overhead. Disable it only if you know + what you are doing. + config MIPS_VPE_LOADER_TOM bool "Load VPE program into memory hidden from linux" depends on MIPS_VPE_LOADER |