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author | Ralf Baechle <ralf@linux-mips.org> | 2014-05-23 16:29:44 +0200 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2014-05-24 00:07:01 +0200 |
commit | b633648c5ad3cfbda0b3daea50d2135d44899259 (patch) | |
tree | 6100185cae10f36a55e71c3b220fc79cfa14b7c0 /arch/mips/include/asm/mmu_context.h | |
parent | 8b2e62cc34feaaf1cac9440a93fb18ac0b1e81bc (diff) | |
download | linux-b633648c5ad3cfbda0b3daea50d2135d44899259.tar.gz linux-b633648c5ad3cfbda0b3daea50d2135d44899259.tar.bz2 linux-b633648c5ad3cfbda0b3daea50d2135d44899259.zip |
MIPS: MT: Remove SMTC support
Nobody is maintaining SMTC anymore and there also seems to be no userbase.
Which is a pity - the SMTC technology primarily developed by Kevin D.
Kissell <kevink@paralogos.com> is an ingenious demonstration for the MT
ASE's power and elegance.
Based on Markos Chandras <Markos.Chandras@imgtec.com> patch
https://patchwork.linux-mips.org/patch/6719/ which while very similar did
no longer apply cleanly when I tried to merge it plus some additional
post-SMTC cleanup - SMTC was a feature as tricky to remove as it was to
merge once upon a time.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/mmu_context.h')
-rw-r--r-- | arch/mips/include/asm/mmu_context.h | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mmu_context.h index e277bbad2871..0f75aaca201b 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -18,10 +18,6 @@ #include <asm/cacheflush.h> #include <asm/hazards.h> #include <asm/tlbflush.h> -#ifdef CONFIG_MIPS_MT_SMTC -#include <asm/mipsmtregs.h> -#include <asm/smtc.h> -#endif /* SMTC */ #include <asm-generic/mm_hooks.h> #define TLBMISS_HANDLER_SETUP_PGD(pgd) \ @@ -63,13 +59,6 @@ extern unsigned long pgd_current[]; #define ASID_INC 0x10 #define ASID_MASK 0xff0 -#elif defined(CONFIG_MIPS_MT_SMTC) - -#define ASID_INC 0x1 -extern unsigned long smtc_asid_mask; -#define ASID_MASK (smtc_asid_mask) -#define HW_ASID_MASK 0xff -/* End SMTC/34K debug hack */ #else /* FIXME: not correct for R6000 */ #define ASID_INC 0x1 @@ -92,7 +81,6 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) #define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1))) #define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1) -#ifndef CONFIG_MIPS_MT_SMTC /* Normal, classic MIPS get_new_mmu_context */ static inline void get_new_mmu_context(struct mm_struct *mm, unsigned long cpu) @@ -115,12 +103,6 @@ get_new_mmu_context(struct mm_struct *mm, unsigned long cpu) cpu_context(cpu, mm) = asid_cache(cpu) = asid; } -#else /* CONFIG_MIPS_MT_SMTC */ - -#define get_new_mmu_context(mm, cpu) smtc_get_new_mmu_context((mm), (cpu)) - -#endif /* CONFIG_MIPS_MT_SMTC */ - /* * Initialize the context related info for a new mm_struct * instance. @@ -141,46 +123,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, { unsigned int cpu = smp_processor_id(); unsigned long flags; -#ifdef CONFIG_MIPS_MT_SMTC - unsigned long oldasid; - unsigned long mtflags; - int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id; - local_irq_save(flags); - mtflags = dvpe(); -#else /* Not SMTC */ local_irq_save(flags); -#endif /* CONFIG_MIPS_MT_SMTC */ /* Check if our ASID is of an older version and thus invalid */ if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & ASID_VERSION_MASK) get_new_mmu_context(next, cpu); -#ifdef CONFIG_MIPS_MT_SMTC - /* - * If the EntryHi ASID being replaced happens to be - * the value flagged at ASID recycling time as having - * an extended life, clear the bit showing it being - * in use by this "CPU", and if that's the last bit, - * free up the ASID value for use and flush any old - * instances of it from the TLB. - */ - oldasid = (read_c0_entryhi() & ASID_MASK); - if(smtc_live_asid[mytlb][oldasid]) { - smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu); - if(smtc_live_asid[mytlb][oldasid] == 0) - smtc_flush_tlb_asid(oldasid); - } - /* - * Tread softly on EntryHi, and so long as we support - * having ASID_MASK smaller than the hardware maximum, - * make sure no "soft" bits become "hard"... - */ - write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) | - cpu_asid(cpu, next)); - ehb(); /* Make sure it propagates to TCStatus */ - evpe(mtflags); -#else write_c0_entryhi(cpu_asid(cpu, next)); -#endif /* CONFIG_MIPS_MT_SMTC */ TLBMISS_HANDLER_SETUP_PGD(next->pgd); /* @@ -213,34 +161,12 @@ activate_mm(struct mm_struct *prev, struct mm_struct *next) unsigned long flags; unsigned int cpu = smp_processor_id(); -#ifdef CONFIG_MIPS_MT_SMTC - unsigned long oldasid; - unsigned long mtflags; - int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id; -#endif /* CONFIG_MIPS_MT_SMTC */ - local_irq_save(flags); /* Unconditionally get a new ASID. */ get_new_mmu_context(next, cpu); -#ifdef CONFIG_MIPS_MT_SMTC - /* See comments for similar code above */ - mtflags = dvpe(); - oldasid = read_c0_entryhi() & ASID_MASK; - if(smtc_live_asid[mytlb][oldasid]) { - smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu); - if(smtc_live_asid[mytlb][oldasid] == 0) - smtc_flush_tlb_asid(oldasid); - } - /* See comments for similar code above */ - write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) | - cpu_asid(cpu, next)); - ehb(); /* Make sure it propagates to TCStatus */ - evpe(mtflags); -#else write_c0_entryhi(cpu_asid(cpu, next)); -#endif /* CONFIG_MIPS_MT_SMTC */ TLBMISS_HANDLER_SETUP_PGD(next->pgd); /* mark mmu ownership change */ @@ -258,48 +184,15 @@ static inline void drop_mmu_context(struct mm_struct *mm, unsigned cpu) { unsigned long flags; -#ifdef CONFIG_MIPS_MT_SMTC - unsigned long oldasid; - /* Can't use spinlock because called from TLB flush within DVPE */ - unsigned int prevvpe; - int mytlb = (smtc_status & SMTC_TLB_SHARED) ? 0 : cpu_data[cpu].vpe_id; -#endif /* CONFIG_MIPS_MT_SMTC */ local_irq_save(flags); if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { get_new_mmu_context(mm, cpu); -#ifdef CONFIG_MIPS_MT_SMTC - /* See comments for similar code above */ - prevvpe = dvpe(); - oldasid = (read_c0_entryhi() & ASID_MASK); - if (smtc_live_asid[mytlb][oldasid]) { - smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu); - if(smtc_live_asid[mytlb][oldasid] == 0) - smtc_flush_tlb_asid(oldasid); - } - /* See comments for similar code above */ - write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) - | cpu_asid(cpu, mm)); - ehb(); /* Make sure it propagates to TCStatus */ - evpe(prevvpe); -#else /* not CONFIG_MIPS_MT_SMTC */ write_c0_entryhi(cpu_asid(cpu, mm)); -#endif /* CONFIG_MIPS_MT_SMTC */ } else { /* will get a new context next time */ -#ifndef CONFIG_MIPS_MT_SMTC cpu_context(cpu, mm) = 0; -#else /* SMTC */ - int i; - - /* SMTC shares the TLB (and ASIDs) across VPEs */ - for_each_online_cpu(i) { - if((smtc_status & SMTC_TLB_SHARED) - || (cpu_data[i].vpe_id == cpu_data[cpu].vpe_id)) - cpu_context(i, mm) = 0; - } -#endif /* CONFIG_MIPS_MT_SMTC */ } local_irq_restore(flags); } |