Messages in this thread Patch in this message |  | | | Date | Fri, 22 May 2009 09:57:20 +0900 (JST) | | Subject | Re: can't flush tlb on e500 | | From | Hideo Saito <> |
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How about following changes because all TLB entries are flushed repeatedly if processes overflow at the table mapping the context. I think that the table should be initialized again because _tlbil_pid() flushes all TLB entries and tlbilx instruction isn't supported on E500(MPC8548).
--- arch/powerpc/mm/mmu_context_nohash.c.orig 2009-03-24 08:12:14.000000000 +0900 +++ arch/powerpc/mm/mmu_context_nohash.c 2009-05-21 16:35:09.000000000 +0900 @@ -107,39 +107,69 @@ static unsigned int steal_context_smp(un */ spin_unlock(&context_lock); cpu_relax(); spin_lock(&context_lock); goto again; } #endif /* CONFIG_SMP */ +/* + * We're flushed using the all context + */ +static void flush_all_context(int cpu) +{ + struct mm_struct *mm; + int n; + + for (n = first_context; n <= last_context; n++) { + + mm = context_mm[n]; + if (mm == NULL || mm->context.id == MMU_NO_CONTEXT) + continue; + + WARN_ON(mm->context.active != 0); + + mm->context.id = MMU_NO_CONTEXT; + } + memset(stale_map[cpu], 0, CTX_MAP_SIZE); + memset(context_map, 0, CTX_MAP_SIZE); + context_map[0] = (1 << first_context) - 1; + nr_free_contexts = last_context - first_context + 1; +} + /* Note that this will also be called on SMP if all other CPUs are * offlined, which means that it may be called for cpu != 0. For * this to work, we somewhat assume that CPUs that are onlined * come up with a fully clean TLB (or are cleaned when offlined) */ static unsigned int steal_context_up(unsigned int id) { struct mm_struct *mm; int cpu = smp_processor_id(); /* Pick up the victim mm */ mm = context_mm[id]; pr_debug("[%d] steal context %d from mm @%p\n", cpu, id, mm); - /* Mark this mm has having no context anymore */ - mm->context.id = MMU_NO_CONTEXT; - /* Flush the TLB for that context */ local_flush_tlb_mm(mm); +#ifdef CONFIG_FSL_BOOKE + flush_all_context(cpu); + __set_bit(id, context_map); + nr_free_contexts--; +#else + /* Mark this mm has having no context anymore */ + mm->context.id = MMU_NO_CONTEXT; + /* XXX This clear should ultimately be part of local_flush_tlb_mm */ __clear_bit(id, stale_map[cpu]); +#endif return id; } #ifdef DEBUG_MAP_CONSISTENCY static void context_check_map(void) { unsigned int id, nrf, nact;
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