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amd64 pmap: Add tunable vm.pmap.di_locked to set DI mode.

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This is done mostly for debugging in field.  Also added the sysctl of
the same name to report used mode.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 month
This commit is contained in:
Konstantin Belousov 2019-05-16 14:29:09 +00:00
parent 1febb0b0ae
commit 5b2c83cb59
1 changed files with 33 additions and 10 deletions
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43
sys/amd64/amd64/pmap.c
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@ -486,13 +486,36 @@ static u_long pmap_invl_gen = 1;
#define PMAP_ASSERT_NOT_IN_DI() \
KASSERT(pmap_not_in_di(), ("DI already started"))
static bool
pmap_di_locked(void)
{
int tun;
if ((cpu_feature2 & CPUID2_CX16) == 0)
return (true);
tun = 0;
TUNABLE_INT_FETCH("vm.pmap.di_locked", &tun);
return (tun != 0);
}
static int
sysctl_pmap_di_locked(SYSCTL_HANDLER_ARGS)
{
int locked;
locked = pmap_di_locked();
return (sysctl_handle_int(oidp, &locked, 0, req));
}
SYSCTL_PROC(_vm_pmap, OID_AUTO, di_locked, CTLTYPE_INT | CTLFLAG_RDTUN |
CTLFLAG_MPSAFE, 0, 0, sysctl_pmap_di_locked, "",
"Locked delayed invalidation");
static bool pmap_not_in_di_l(void);
static bool pmap_not_in_di_u(void);
DEFINE_IFUNC(, bool, pmap_not_in_di, (void), static)
{
return ((cpu_feature2 & CPUID2_CX16) == 0 ? pmap_not_in_di_l :
pmap_not_in_di_u);
return (pmap_di_locked() ? pmap_not_in_di_l : pmap_not_in_di_u);
}
static bool
@ -933,29 +956,29 @@ pmap_delayed_invl_wait_u(vm_page_t m)
DEFINE_IFUNC(, void, pmap_thread_init_invl_gen, (struct thread *), static)
{
return ((cpu_feature2 & CPUID2_CX16) == 0 ?
pmap_thread_init_invl_gen_l : pmap_thread_init_invl_gen_u);
return (pmap_di_locked() ? pmap_thread_init_invl_gen_l :
pmap_thread_init_invl_gen_u);
}
DEFINE_IFUNC(static, void, pmap_delayed_invl_start, (void), static)
{
return ((cpu_feature2 & CPUID2_CX16) == 0 ?
pmap_delayed_invl_start_l : pmap_delayed_invl_start_u);
return (pmap_di_locked() ? pmap_delayed_invl_start_l :
pmap_delayed_invl_start_u);
}
DEFINE_IFUNC(static, void, pmap_delayed_invl_finish, (void), static)
{
return ((cpu_feature2 & CPUID2_CX16) == 0 ?
pmap_delayed_invl_finish_l : pmap_delayed_invl_finish_u);
return (pmap_di_locked() ? pmap_delayed_invl_finish_l :
pmap_delayed_invl_finish_u);
}
DEFINE_IFUNC(static, void, pmap_delayed_invl_wait, (vm_page_t), static)
{
return ((cpu_feature2 & CPUID2_CX16) == 0 ?
pmap_delayed_invl_wait_l : pmap_delayed_invl_wait_u);
return (pmap_di_locked() ? pmap_delayed_invl_wait_l :
pmap_delayed_invl_wait_u);
}
/*