From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Peter De Schrijver" <pdeschrijver@nvidia.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Jasper Korten" <jja2000@gmail.com>,
"David Heidelberg" <david@ixit.cz>,
"Peter Geis" <pgwipeout@gmail.com>,
linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 09/17] arm: tegra20: cpuidle: Handle case where secondary CPU hangs on entering LP2
Date: Fri, 21 Feb 2020 15:55:22 +0100 [thread overview]
Message-ID: <20200221145522.GG10516@linaro.org> (raw)
In-Reply-To: <20200212235134.12638-10-digetx@gmail.com>
On Thu, Feb 13, 2020 at 02:51:26AM +0300, Dmitry Osipenko wrote:
> It is possible that something may go wrong with the secondary CPU, in that
> case it is much nicer to get a dump of the flow-controller state before
> hanging machine.
>
> Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
> Tested-by: Peter Geis <pgwipeout@gmail.com>
> Tested-by: Jasper Korten <jja2000@gmail.com>
> Tested-by: David Heidelberg <david@ixit.cz>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> arch/arm/mach-tegra/cpuidle-tegra20.c | 47 +++++++++++++++++++++++++--
> 1 file changed, 45 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-tegra/cpuidle-tegra20.c b/arch/arm/mach-tegra/cpuidle-tegra20.c
> index 9672c619f4bc..bcc158b72e67 100644
> --- a/arch/arm/mach-tegra/cpuidle-tegra20.c
> +++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
> @@ -83,14 +83,57 @@ static inline void tegra20_wake_cpu1_from_reset(void)
> }
> #endif
>
> +static void tegra20_report_cpus_state(void)
> +{
> + unsigned long cpu, lcpu, csr;
> +
> + for_each_cpu(lcpu, cpu_possible_mask) {
> + cpu = cpu_logical_map(lcpu);
> + csr = flowctrl_read_cpu_csr(cpu);
> +
> + pr_err("cpu%lu: online=%d flowctrl_csr=0x%08lx\n",
> + cpu, cpu_online(lcpu), csr);
> + }
> +}
> +
> +static int tegra20_wait_for_secondary_cpu_parking(void)
> +{
> + unsigned int retries = 3;
> +
> + while (retries--) {
> + ktime_t timeout = ktime_add_ms(ktime_get(), 500);
> +
> + /*
> + * The primary CPU0 core shall wait for the secondaries
> + * shutdown in order to power-off CPU's cluster safely.
> + * The timeout value depends on the current CPU frequency,
> + * it takes about 40-150us in average and over 1000us in
> + * a worst case scenario.
> + */
> + do {
> + if (tegra_cpu_rail_off_ready())
> + return 0;
> +
> + } while (ktime_before(ktime_get(), timeout));
> +
> + pr_err("secondary CPU taking too long to park\n");
> +
> + tegra20_report_cpus_state();
> + }
> +
> + pr_err("timed out waiting secondaries to park\n");
> +
> + return -ETIMEDOUT;
> +}
> +
> static bool tegra20_cpu_cluster_power_down(struct cpuidle_device *dev,
> struct cpuidle_driver *drv,
> int index)
> {
> bool ret;
>
> - while (!tegra_cpu_rail_off_ready())
> - cpu_relax();
> + if (tegra20_wait_for_secondary_cpu_parking())
> + return false;
>
> ret = !tegra_pm_enter_lp2();
>
> --
> 2.24.0
>
--
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next prev parent reply other threads:[~2020-02-21 14:55 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 23:51 [PATCH v9 00/17] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 01/17] ARM: tegra: Compile sleep-tegra20/30.S unconditionally Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 02/17] ARM: tegra: Add tegra_pm_park_secondary_cpu() Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 03/17] ARM: tegra: Remove pen-locking from cpuidle-tegra20 Dmitry Osipenko
2020-02-21 14:58 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 04/17] ARM: tegra: Change tegra_set_cpu_in_lp2() type to void Dmitry Osipenko
2020-02-21 15:04 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 05/17] ARM: tegra: Propagate error from tegra_idle_lp2_last() Dmitry Osipenko
2020-02-21 15:16 ` Daniel Lezcano
2020-02-21 17:21 ` Dmitry Osipenko
2020-02-21 17:40 ` Daniel Lezcano
2020-02-21 18:42 ` Dmitry Osipenko
2020-02-21 19:16 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 06/17] ARM: tegra: Expose PM functions required for new cpuidle driver Dmitry Osipenko
2020-02-21 15:18 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 07/17] ARM: tegra: Rename some of the newly exposed PM functions Dmitry Osipenko
2020-02-21 15:19 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 08/17] ARM: tegra: Make outer_disable() open-coded Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 09/17] arm: tegra20: cpuidle: Handle case where secondary CPU hangs on entering LP2 Dmitry Osipenko
2020-02-21 14:55 ` Daniel Lezcano [this message]
2020-02-21 15:43 ` Daniel Lezcano
2020-02-21 16:56 ` Dmitry Osipenko
2020-02-21 17:36 ` Daniel Lezcano
2020-02-21 18:19 ` Dmitry Osipenko
2020-02-21 20:02 ` Daniel Lezcano
2020-02-21 20:21 ` Dmitry Osipenko
2020-02-21 20:42 ` Dmitry Osipenko
2020-02-21 20:48 ` Daniel Lezcano
2020-02-21 20:54 ` Dmitry Osipenko
2020-02-21 21:11 ` Daniel Lezcano
2020-02-24 15:12 ` Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 10/17] arm: tegra20: cpuidle: Make abort_flag atomic Dmitry Osipenko
2020-02-21 15:25 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 11/17] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier Dmitry Osipenko
2020-02-21 15:25 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 12/17] cpuidle: Refactor and move out NVIDIA Tegra20 driver into drivers/cpuidle Dmitry Osipenko
2020-02-21 15:44 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 13/17] cpuidle: tegra: Squash Tegra30 driver into the common driver Dmitry Osipenko
2020-02-21 16:29 ` Daniel Lezcano
2020-02-21 16:59 ` Dmitry Osipenko
2020-02-21 17:41 ` Daniel Lezcano
2020-02-21 18:20 ` Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 14/17] cpuidle: tegra: Squash Tegra114 " Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 15/17] cpuidle: tegra: Disable CC6 state if LP2 unavailable Dmitry Osipenko
2020-02-21 16:39 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 16/17] ARM: multi_v7_defconfig: Enable Tegra cpuidle driver Dmitry Osipenko
2020-02-21 16:30 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 17/17] ARM: tegra: Enable Tegra cpuidle driver in tegra_defconfig Dmitry Osipenko
2020-02-21 16:31 ` Daniel Lezcano
2020-02-13 0:38 ` [PATCH v9 00/17] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) Dmitry Osipenko
2020-02-18 14:56 ` Dmitry Osipenko
2020-02-24 16:44 ` Dmitry Osipenko
-- strict thread matches above, loose matches on Subject: below --
2019-12-18 21:04 Dmitry Osipenko
2019-12-18 21:04 ` [PATCH v9 09/17] arm: tegra20: cpuidle: Handle case where secondary CPU hangs on entering LP2 Dmitry Osipenko
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