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arm64: arch_timer: Rework the set_next_event workarounds 

The way we work around errata affecting set_next_event is not very
nice, at it imposes this workaround on errata that do not need it.

Add new workaround hooks and let the existing workarounds use them.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2017-01-27 10:27:09 +00:00
parent 8328089f0a
commit 01d3e3ff26
2 changed files with 30 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm64/include/asm/arch_timer.h
View File

@ -42,6 +42,8 @@ enum arch_timer_erratum_match_type {
ate_match_local_cap_id,
};
struct clock_event_device;
struct arch_timer_erratum_workaround {
enum arch_timer_erratum_match_type match_type;
const void *id;
@ -49,6 +51,8 @@ struct arch_timer_erratum_workaround {
u32 (*read_cntp_tval_el0)(void);
u32 (*read_cntv_tval_el0)(void);
u64 (*read_cntvct_el0)(void);
int (*set_next_event_phys)(unsigned long, struct clock_event_device *);
int (*set_next_event_virt)(unsigned long, struct clock_event_device *);
};
extern const struct arch_timer_erratum_workaround *timer_unstable_counter_workaround;

31
drivers/clocksource/arm_arch_timer.c
View File

@ -282,6 +282,8 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.read_cntp_tval_el0 = fsl_a008585_read_cntp_tval_el0,
.read_cntv_tval_el0 = fsl_a008585_read_cntv_tval_el0,
.read_cntvct_el0 = fsl_a008585_read_cntvct_el0,
.set_next_event_phys = erratum_set_next_event_tval_phys,
.set_next_event_virt = erratum_set_next_event_tval_virt,
},
#endif
#ifdef CONFIG_HISILICON_ERRATUM_161010101
@ -292,6 +294,8 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.read_cntp_tval_el0 = hisi_161010101_read_cntp_tval_el0,
.read_cntv_tval_el0 = hisi_161010101_read_cntv_tval_el0,
.read_cntvct_el0 = hisi_161010101_read_cntvct_el0,
.set_next_event_phys = erratum_set_next_event_tval_phys,
.set_next_event_virt = erratum_set_next_event_tval_virt,
},
#endif
};
@ -377,11 +381,24 @@ static void arch_timer_check_ool_workaround(enum arch_timer_erratum_match_type t
local ? "local" : "global", wa->desc);
}
#define erratum_handler(fn, r, ...) \
({ \
bool __val; \
if (needs_unstable_timer_counter_workaround() && \
timer_unstable_counter_workaround->fn) { \
r = timer_unstable_counter_workaround->fn(__VA_ARGS__); \
__val = true; \
} else { \
__val = false; \
} \
__val; \
})
#else
#define arch_timer_check_ool_workaround(t,a) do { } while(0)
#define erratum_set_next_event_tval_virt(...) ({BUG(); 0;})
#define erratum_set_next_event_tval_phys(...) ({BUG(); 0;})
#define needs_unstable_timer_counter_workaround() ({false;})
#define erratum_handler(fn, r, ...) ({false;})
#endif /* CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND */
static __always_inline irqreturn_t timer_handler(const int access,
@ -474,8 +491,10 @@ static __always_inline void set_next_event(const int access, unsigned long evt,
static int arch_timer_set_next_event_virt(unsigned long evt,
struct clock_event_device *clk)
{
if (needs_unstable_timer_counter_workaround())
return erratum_set_next_event_tval_virt(evt, clk);
int ret;
if (erratum_handler(set_next_event_virt, ret, evt, clk))
return ret;
set_next_event(ARCH_TIMER_VIRT_ACCESS, evt, clk);
return 0;
@ -484,8 +503,10 @@ static int arch_timer_set_next_event_virt(unsigned long evt,
static int arch_timer_set_next_event_phys(unsigned long evt,
struct clock_event_device *clk)
{
if (needs_unstable_timer_counter_workaround())
return erratum_set_next_event_tval_phys(evt, clk);
int ret;
if (erratum_handler(set_next_event_phys, ret, evt, clk))
return ret;
set_next_event(ARCH_TIMER_PHYS_ACCESS, evt, clk);
return 0;