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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 | |
| parent | [MIPS] separate platform_device registration for VR41xx RTC (diff) | |
| download | linux-dev-0db34215c7e0ef618e7b29fbf271194ca5434f8e.tar.xz linux-dev-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')
| -rw-r--r-- | arch/mips/Kconfig | 13 | ||||
| -rw-r--r-- | arch/mips/kernel/entry.S | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/genex.S | 2 |
3 files changed, 17 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 diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S index 686249c5c328..e29598ae939d 100644 --- a/arch/mips/kernel/entry.S +++ b/arch/mips/kernel/entry.S @@ -84,6 +84,7 @@ FEXPORT(restore_all) # restore full frame LONG_S sp, TI_REGS($28) jal deferred_smtc_ipi LONG_S s0, TI_REGS($28) +#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP /* Re-arm any temporarily masked interrupts not explicitly "acked" */ mfc0 v0, CP0_TCSTATUS ori v1, v0, TCSTATUS_IXMT @@ -110,6 +111,7 @@ FEXPORT(restore_all) # restore full frame _ehb xor t0, t0, t3 mtc0 t0, CP0_TCCONTEXT +#endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP */ #endif /* CONFIG_MIPS_MT_SMTC */ .set noat RESTORE_TEMP diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S index 297bd56c2347..c0f19d638b98 100644 --- a/arch/mips/kernel/genex.S +++ b/arch/mips/kernel/genex.S @@ -243,9 +243,11 @@ NESTED(except_vec_vi_handler, 0, sp) */ mfc0 t1, CP0_STATUS and t0, a0, t1 +#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP mfc0 t2, CP0_TCCONTEXT or t0, t0, t2 mtc0 t0, CP0_TCCONTEXT +#endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP */ xor t1, t1, t0 mtc0 t1, CP0_STATUS _ehb |