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arm64: arch_timer: Add erratum handler for CPU-specific capability 

Should we ever have a workaround for an erratum that is detected using
a capability and affecting a particular CPU, it'd be nice to have
a way to probe them directly.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2017-03-20 16:47:59 +00:00
parent 651bb2e9dc
commit 0064030c6f
2 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/arch_timer.h
View File

@ -39,6 +39,7 @@ extern struct static_key_false arch_timer_read_ool_enabled;
enum arch_timer_erratum_match_type {
ate_match_dt,
ate_match_local_cap_id,
};
struct arch_timer_erratum_workaround {

28
drivers/clocksource/arm_arch_timer.c
View File

@ -214,6 +214,13 @@ bool arch_timer_check_dt_erratum(const struct arch_timer_erratum_workaround *wa,
return of_property_read_bool(np, wa->id);
}
static
bool arch_timer_check_local_cap_erratum(const struct arch_timer_erratum_workaround *wa,
const void *arg)
{
return this_cpu_has_cap((uintptr_t)wa->id);
}
static const struct arch_timer_erratum_workaround *
arch_timer_iterate_errata(enum arch_timer_erratum_match_type type,
ate_match_fn_t match_fn,
@ -244,14 +251,16 @@ static void arch_timer_check_ool_workaround(enum arch_timer_erratum_match_type t
{
const struct arch_timer_erratum_workaround *wa;
ate_match_fn_t match_fn = NULL;
if (static_branch_unlikely(&arch_timer_read_ool_enabled))
return;
bool local = false;
switch (type) {
case ate_match_dt:
match_fn = arch_timer_check_dt_erratum;
break;
case ate_match_local_cap_id:
match_fn = arch_timer_check_local_cap_erratum;
local = true;
break;
default:
WARN_ON(1);
return;
@ -261,8 +270,17 @@ static void arch_timer_check_ool_workaround(enum arch_timer_erratum_match_type t
if (!wa)
return;
if (needs_unstable_timer_counter_workaround()) {
if (wa != timer_unstable_counter_workaround)
pr_warn("Can't enable workaround for %s (clashes with %s\n)",
wa->desc,
timer_unstable_counter_workaround->desc);
return;
}
arch_timer_enable_workaround(wa);
pr_info("Enabling global workaround for %s\n", wa->desc);
pr_info("Enabling %s workaround for %s\n",
local ? "local" : "global", wa->desc);
}
#else
@ -522,6 +540,8 @@ static void __arch_timer_setup(unsigned type,
BUG();
}
arch_timer_check_ool_workaround(ate_match_local_cap_id, NULL);
erratum_workaround_set_sne(clk);
} else {
clk->features |= CLOCK_EVT_FEAT_DYNIRQ;