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- Unlike cache invalidation and TLB demapping IPIs, reading registers from

Browse source 
other CPUs doesn't require locking so get rid of it. As the latter is used
  for the timecounter on certain machine models, using a spin lock in this
  case can lead to a deadlock with the upcoming callout(9) rework.
- Merge r134227/r167250 from x86:
  Avoid cross-IPI SMP deadlock by using the smp_ipi_mtx spin lock not only
  for smp_rendezvous_cpus() but also for the MD cache invalidation and TLB
  demapping IPIs.
- Mark some unused function arguments as such.

MFC after:	1 week
This commit is contained in:
Marius Strobl 2012-08-29 16:56:50 +00:00
parent 57bc16315f
commit bf38cf8ab3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=239864
4 changed files with 29 additions and 20 deletions
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3
sys/kern/subr_witness.c
View file

@ -669,9 +669,6 @@ static struct witness_order_list_entry order_lists[] = {
*/
{ "intrcnt", &lock_class_mtx_spin },
{ "icu", &lock_class_mtx_spin },
#if defined(SMP) && defined(__sparc64__)
{ "ipi", &lock_class_mtx_spin },
#endif
#ifdef __i386__
{ "allpmaps", &lock_class_mtx_spin },
{ "descriptor tables", &lock_class_mtx_spin },

34
sys/sparc64/include/smp.h
View file

@ -109,7 +109,6 @@ extern cpu_ipi_single_t *cpu_ipi_single;
void mp_init(u_int cpu_impl);
extern struct mtx ipi_mtx;
extern struct ipi_cache_args ipi_cache_args;
extern struct ipi_rd_args ipi_rd_args;
extern struct ipi_tlb_args ipi_tlb_args;
@ -169,7 +168,7 @@ ipi_dcache_page_inval(void *func, vm_paddr_t pa)
return (NULL);
sched_pin();
ica = &ipi_cache_args;
mtx_lock_spin(&ipi_mtx);
mtx_lock_spin(&smp_ipi_mtx);
ica->ica_mask = all_cpus;
CPU_CLR(PCPU_GET(cpuid), &ica->ica_mask);
ica->ica_pa = pa;
@ -186,7 +185,7 @@ ipi_icache_page_inval(void *func, vm_paddr_t pa)
return (NULL);
sched_pin();
ica = &ipi_cache_args;
mtx_lock_spin(&ipi_mtx);
mtx_lock_spin(&smp_ipi_mtx);
ica->ica_mask = all_cpus;
CPU_CLR(PCPU_GET(cpuid), &ica->ica_mask);
ica->ica_pa = pa;
@ -203,7 +202,6 @@ ipi_rd(u_int cpu, void *func, u_long *val)
return (NULL);
sched_pin();
ira = &ipi_rd_args;
mtx_lock_spin(&ipi_mtx);
CPU_SETOF(cpu, &ira->ira_mask);
ira->ira_val = val;
cpu_ipi_single(cpu, 0, (u_long)func, (u_long)ira);
@ -227,7 +225,7 @@ ipi_tlb_context_demap(struct pmap *pm)
return (NULL);
}
ita = &ipi_tlb_args;
mtx_lock_spin(&ipi_mtx);
mtx_lock_spin(&smp_ipi_mtx);
ita->ita_mask = cpus;
ita->ita_pmap = pm;
cpu_ipi_selected(cpus, 0, (u_long)tl_ipi_tlb_context_demap,
@ -252,7 +250,7 @@ ipi_tlb_page_demap(struct pmap *pm, vm_offset_t va)
return (NULL);
}
ita = &ipi_tlb_args;
mtx_lock_spin(&ipi_mtx);
mtx_lock_spin(&smp_ipi_mtx);
ita->ita_mask = cpus;
ita->ita_pmap = pm;
ita->ita_va = va;
@ -277,7 +275,7 @@ ipi_tlb_range_demap(struct pmap *pm, vm_offset_t start, vm_offset_t end)
return (NULL);
}
ita = &ipi_tlb_args;
mtx_lock_spin(&ipi_mtx);
mtx_lock_spin(&smp_ipi_mtx);
ita->ita_mask = cpus;
ita->ita_pmap = pm;
ita->ita_start = start;
@ -295,7 +293,19 @@ ipi_wait(void *cookie)
if ((mask = cookie) != NULL) {
while (!CPU_EMPTY(mask))
;
mtx_unlock_spin(&ipi_mtx);
mtx_unlock_spin(&smp_ipi_mtx);
sched_unpin();
}
}
static __inline void
ipi_wait_unlocked(void *cookie)
{
volatile cpuset_t *mask;
if ((mask = cookie) != NULL) {
while (!CPU_EMPTY(mask))
;
sched_unpin();
}
}
@ -352,7 +362,13 @@ ipi_tlb_range_demap(struct pmap *pm __unused, vm_offset_t start __unused,
}
static __inline void
ipi_wait(void *cookie)
ipi_wait(void *cookie __unused)
{
}
static __inline void
ipi_wait_unlocked(void *cookie __unused)
{
}

8
sys/sparc64/sparc64/mp_machdep.c
View file

@ -113,8 +113,6 @@ struct ipi_rd_args ipi_rd_args;
struct ipi_tlb_args ipi_tlb_args;
struct pcb stoppcbs[MAXCPU];
struct mtx ipi_mtx;
cpu_ipi_selected_t *cpu_ipi_selected;
cpu_ipi_single_t *cpu_ipi_single;
@ -280,8 +278,6 @@ void
cpu_mp_start(void)
{
mtx_init(&ipi_mtx, "ipi", NULL, MTX_SPIN);
intr_setup(PIL_AST, cpu_ipi_ast, -1, NULL, NULL);
intr_setup(PIL_RENDEZVOUS, (ih_func_t *)smp_rendezvous_action,
-1, NULL, NULL);
@ -503,13 +499,13 @@ cpu_mp_shutdown(void)
}
static void
cpu_ipi_ast(struct trapframe *tf)
cpu_ipi_ast(struct trapframe *tf __unused)
{
}
static void
cpu_ipi_stop(struct trapframe *tf)
cpu_ipi_stop(struct trapframe *tf __unused)
{
u_int cpuid;

4
sys/sparc64/sparc64/tick.c
View file

@ -332,7 +332,7 @@ stick_get_timecount_mp(struct timecounter *tc)
if (curcpu == 0)
stick = rdstick();
else
ipi_wait(ipi_rd(0, tl_ipi_stick_rd, &stick));
ipi_wait_unlocked(ipi_rd(0, tl_ipi_stick_rd, &stick));
sched_unpin();
return (stick);
}
@ -346,7 +346,7 @@ tick_get_timecount_mp(struct timecounter *tc)
if (curcpu == 0)
tick = rd(tick);
else
ipi_wait(ipi_rd(0, tl_ipi_tick_rd, &tick));
ipi_wait_unlocked(ipi_rd(0, tl_ipi_tick_rd, &tick));
sched_unpin();
return (tick);
}