From: Samuel Holland <samuel@sholland.org> To: Daniel Lezcano <daniel.lezcano@linaro.org>, Thomas Gleixner <tglx@linutronix.de> Cc: Samuel Holland <samuel@sholland.org>, Albert Ou <aou@eecs.berkeley.edu>, Atish Patra <atishp@atishpatra.org>, Dmitriy Cherkasov <dmitriy@oss-tech.org>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH] clocksource/drivers/riscv: Events are stopped during CPU suspend Date: Sun, 8 May 2022 20:21:21 -0500 [thread overview] Message-ID: <20220509012121.40031-1-samuel@sholland.org> (raw) Some implementations of the SBI time extension depend on hart-local state (for example, CSRs) that are lost or hardware that is powered down when a CPU is suspended. To be safe, the clockevents driver cannot assume that timer IRQs will be received during CPU suspend. Fixes: 62b019436814 ("clocksource: new RISC-V SBI timer driver") Signed-off-by: Samuel Holland <samuel@sholland.org> --- drivers/clocksource/timer-riscv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c index 1767f8bf2013..593d5a957b69 100644 --- a/drivers/clocksource/timer-riscv.c +++ b/drivers/clocksource/timer-riscv.c @@ -34,7 +34,7 @@ static int riscv_clock_next_event(unsigned long delta, static unsigned int riscv_clock_event_irq; static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = { .name = "riscv_timer_clockevent", - .features = CLOCK_EVT_FEAT_ONESHOT, + .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP, .rating = 100, .set_next_event = riscv_clock_next_event, }; -- 2.35.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Samuel Holland <samuel@sholland.org> To: Daniel Lezcano <daniel.lezcano@linaro.org>, Thomas Gleixner <tglx@linutronix.de> Cc: Samuel Holland <samuel@sholland.org>, Albert Ou <aou@eecs.berkeley.edu>, Atish Patra <atishp@atishpatra.org>, Dmitriy Cherkasov <dmitriy@oss-tech.org>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH] clocksource/drivers/riscv: Events are stopped during CPU suspend Date: Sun, 8 May 2022 20:21:21 -0500 [thread overview] Message-ID: <20220509012121.40031-1-samuel@sholland.org> (raw) Some implementations of the SBI time extension depend on hart-local state (for example, CSRs) that are lost or hardware that is powered down when a CPU is suspended. To be safe, the clockevents driver cannot assume that timer IRQs will be received during CPU suspend. Fixes: 62b019436814 ("clocksource: new RISC-V SBI timer driver") Signed-off-by: Samuel Holland <samuel@sholland.org> --- drivers/clocksource/timer-riscv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c index 1767f8bf2013..593d5a957b69 100644 --- a/drivers/clocksource/timer-riscv.c +++ b/drivers/clocksource/timer-riscv.c @@ -34,7 +34,7 @@ static int riscv_clock_next_event(unsigned long delta, static unsigned int riscv_clock_event_irq; static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = { .name = "riscv_timer_clockevent", - .features = CLOCK_EVT_FEAT_ONESHOT, + .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP, .rating = 100, .set_next_event = riscv_clock_next_event, }; -- 2.35.1
next reply other threads:[~2022-05-09 1:21 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-09 1:21 Samuel Holland [this message] 2022-05-09 1:21 ` [PATCH] clocksource/drivers/riscv: Events are stopped during CPU suspend Samuel Holland 2022-05-09 2:56 ` Jessica Clarke 2022-05-09 2:56 ` Jessica Clarke 2022-05-09 3:51 ` Anup Patel 2022-05-09 3:51 ` Anup Patel 2022-05-09 11:44 ` Daniel Lezcano 2022-05-09 11:44 ` Daniel Lezcano 2022-05-27 8:36 ` [tip: timers/core] " tip-bot2 for Samuel Holland 2022-09-29 21:50 ` [PATCH] " Conor Dooley 2022-09-29 21:50 ` Conor Dooley 2022-10-09 23:45 ` Palmer Dabbelt 2022-10-09 23:45 ` Palmer Dabbelt 2022-10-24 5:01 ` Samuel Holland 2022-10-24 5:01 ` Samuel Holland 2022-10-24 7:04 ` Conor Dooley 2022-10-24 7:04 ` Conor Dooley 2022-10-24 8:04 ` Anup Patel 2022-10-24 8:04 ` Anup Patel 2022-10-27 23:07 ` Palmer Dabbelt 2022-10-27 23:07 ` Palmer Dabbelt 2022-10-27 23:41 ` Samuel Holland 2022-10-27 23:41 ` Samuel Holland 2022-10-28 0:30 ` Conor Dooley 2022-10-28 0:30 ` Conor Dooley
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