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- When allocating tcbs, flush tlb via space_t function, otherwise remote 

TLBs may get ignored
- When flushing a kernel address from the TLB, always flush remote TLBs
synchronously.
This commit is contained in:
Jan Stoess 2008-01-08 14:09:58 +01:00
parent b506bcee80
commit e86e396e72
1 changed files with 37 additions and 15 deletions
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52
kernel/src/glue/v4-x86/space.cc
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@ -1,6 +1,6 @@
/*********************************************************************
*
* Copyright (C) 2007, Karlsruhe University
* Copyright (C) 2007-2008, Karlsruhe University
*
* File path: glue/v4-x86/space.cc
* Description:
@ -25,6 +25,7 @@
#include INC_ARCH(trapgate.h)
#include INC_ARCH(pgent.h)
#include INC_GLUE(cpu.h)
#include INC_GLUE(memory.h)
#include INC_GLUE(space.h)
@ -103,9 +104,11 @@ void space_t::allocate_tcb(addr_t addr)
//TRACEF("tcb=%p, page=%p\n", addr, page);
// map tcb kernel-writable, global
x86_mmu_t::flush_tlbent ((word_t)addr);
get_kernel_space()->add_mapping(addr, virt_to_phys(page), PGSIZE_KTCB,
true, true, true);
flush_tlbent (this, addr, page_shift(PGSIZE_KTCB));
sync_kernel_space(addr);
}
@ -314,7 +317,9 @@ void space_t::map_dummy_tcb(addr_t addr)
//TRACEF("%p\n", addr);
//enter_kdebug("map dummy");
get_kernel_space()->add_mapping(addr, (addr_t)get_dummy_tcb(), PGSIZE_KTCB,
false, true, false);
false, true, false);
flush_tlbent (this, addr, page_shift(PGSIZE_KTCB));
sync_kernel_space(addr);
}
@ -988,20 +993,36 @@ active_cpu_space_t active_cpu_space;
#endif
static void do_xcpu_flush_tlb(cpu_mb_entry_t * entry)
{
spin(60, get_current_cpu());
//TRACEF("remote flush %x %d\n", get_current_space(), get_current_cpu());
x86_mmu_t::flush_tlb (__FLUSH_GLOBAL__);
}
INLINE void tag_flush_remote (space_t * curspace)
static void flush_tlb_remote()
{
for (int cpu = 0; cpu < CONFIG_SMP_MAX_CPUS; cpu++)
for (cpuid_t cpu = 0; cpu < cpu_t::count; cpu++)
if (cpu_remote_flush & (1 << cpu))
sync_xcpu_request(cpu, do_xcpu_flush_tlb, NULL,
cpu_remote_flush_global & (1 << cpu));
cpu_remote_flush = 0;
cpu_remote_flush_global = 0;
}
INLINE void tag_flush_remote (space_t * curspace, bool force=false)
{
for (cpuid_t cpu = 0; cpu < cpu_t::count; cpu++)
{
if (cpu == get_current_cpu())
continue;
if (active_cpu_space.get(cpu) == curspace)
if (active_cpu_space.get(cpu) == curspace || force)
{
//TRACEF("tag remote flush %x %d\n", curspace, cpu);
cpu_remote_flush |= (1 << cpu);
}
#if defined(CONFIG_X86_SMALL_SPACES)
// For small spaces we must also do TLB shootdown if current
@ -1028,26 +1049,27 @@ void space_t::flush_tlb (space_t * curspace)
if (this == curspace || IS_SPACE_SMALL (this))
x86_mmu_t::flush_tlb (IS_SPACE_GLOBAL (this));
tag_flush_remote (this);
}
void space_t::flush_tlbent (space_t * curspace, addr_t addr, word_t log2size)
{
/* js: for kernel addresses, we force an immediate remote flush */
bool force = !is_user_area(addr);
if (this == curspace || IS_SPACE_SMALL (this))
x86_mmu_t::flush_tlbent ((word_t) addr);
tag_flush_remote (this);
tag_flush_remote (this, force);
if (force)
flush_tlb_remote();
}
void space_t::end_update ()
{
for (int cpu = 0; cpu < CONFIG_SMP_MAX_CPUS; cpu++)
if (cpu_remote_flush & (1 << cpu))
sync_xcpu_request(cpu, do_xcpu_flush_tlb, NULL,
cpu_remote_flush_global & (1 << cpu));
cpu_remote_flush = 0;
cpu_remote_flush_global = 0;
flush_tlb_remote();
}