From: Alexandre Belloni <alexandre.belloni@bootlin.com> To: Daniel Lezcano <daniel.lezcano@linaro.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Thomas Gleixner <tglx@linutronix.de>, Arnd Bergmann <arnd@arndb.de>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexander Dahl <ada@thorsis.com>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, Alexandre Belloni <alexandre.belloni@bootlin.com> Subject: [PATCH 05/12] clocksource/drivers/tcb_clksrc: Use tcb as sched_clock Date: Wed, 3 Apr 2019 16:11:13 +0200 [thread overview] Message-ID: <20190403141120.32754-6-alexandre.belloni@bootlin.com> (raw) In-Reply-To: <20190403141120.32754-1-alexandre.belloni@bootlin.com> Now that the driver is registered early enough, use the TCB as the sched_clock which is much more accurate than the jiffies implementation. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> --- drivers/clocksource/tcb_clksrc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index c7eec9808289..10350dffd157 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -11,6 +11,7 @@ #include <linux/io.h> #include <linux/of_address.h> #include <linux/of_irq.h> +#include <linux/sched_clock.h> #include <linux/syscore_ops.h> #include <soc/at91/atmel_tcb.h> @@ -114,6 +115,16 @@ static struct clocksource clksrc = { .resume = tc_clksrc_resume, }; +static u64 notrace tc_sched_clock_read(void) +{ + return tc_get_cycles(&clksrc); +} + +static u64 notrace tc_sched_clock_read32(void) +{ + return tc_get_cycles32(&clksrc); +} + #ifdef CONFIG_GENERIC_CLOCKEVENTS struct tc_clkevt_device { @@ -327,6 +338,7 @@ static int __init tcb_clksrc_init(struct device_node *node) struct atmel_tc tc; struct clk *t0_clk; const struct of_device_id *match; + u64 (*tc_sched_clock)(void); int irq; u32 rate, divided_rate = 0; int best_divisor_idx = -1; @@ -416,6 +428,7 @@ static int __init tcb_clksrc_init(struct device_node *node) clksrc.read = tc_get_cycles32; /* setup ony channel 0 */ tcb_setup_single_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read32; } else { /* we have three clocks no matter what the * underlying platform supports. @@ -427,6 +440,7 @@ static int __init tcb_clksrc_init(struct device_node *node) } /* setup both channel 0 & 1 */ tcb_setup_dual_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read; } /* and away we go! */ @@ -439,6 +453,8 @@ static int __init tcb_clksrc_init(struct device_node *node) if (ret) goto err_unregister_clksrc; + sched_clock_register(tc_sched_clock, 32, divided_rate); + return 0; err_unregister_clksrc: -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Alexandre Belloni <alexandre.belloni@bootlin.com> To: Daniel Lezcano <daniel.lezcano@linaro.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-pwm@vger.kernel.org, Alexandre Belloni <alexandre.belloni@bootlin.com>, Arnd Bergmann <arnd@arndb.de>, Alexander Dahl <ada@thorsis.com>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/12] clocksource/drivers/tcb_clksrc: Use tcb as sched_clock Date: Wed, 3 Apr 2019 16:11:13 +0200 [thread overview] Message-ID: <20190403141120.32754-6-alexandre.belloni@bootlin.com> (raw) In-Reply-To: <20190403141120.32754-1-alexandre.belloni@bootlin.com> Now that the driver is registered early enough, use the TCB as the sched_clock which is much more accurate than the jiffies implementation. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> --- drivers/clocksource/tcb_clksrc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index c7eec9808289..10350dffd157 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -11,6 +11,7 @@ #include <linux/io.h> #include <linux/of_address.h> #include <linux/of_irq.h> +#include <linux/sched_clock.h> #include <linux/syscore_ops.h> #include <soc/at91/atmel_tcb.h> @@ -114,6 +115,16 @@ static struct clocksource clksrc = { .resume = tc_clksrc_resume, }; +static u64 notrace tc_sched_clock_read(void) +{ + return tc_get_cycles(&clksrc); +} + +static u64 notrace tc_sched_clock_read32(void) +{ + return tc_get_cycles32(&clksrc); +} + #ifdef CONFIG_GENERIC_CLOCKEVENTS struct tc_clkevt_device { @@ -327,6 +338,7 @@ static int __init tcb_clksrc_init(struct device_node *node) struct atmel_tc tc; struct clk *t0_clk; const struct of_device_id *match; + u64 (*tc_sched_clock)(void); int irq; u32 rate, divided_rate = 0; int best_divisor_idx = -1; @@ -416,6 +428,7 @@ static int __init tcb_clksrc_init(struct device_node *node) clksrc.read = tc_get_cycles32; /* setup ony channel 0 */ tcb_setup_single_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read32; } else { /* we have three clocks no matter what the * underlying platform supports. @@ -427,6 +440,7 @@ static int __init tcb_clksrc_init(struct device_node *node) } /* setup both channel 0 & 1 */ tcb_setup_dual_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read; } /* and away we go! */ @@ -439,6 +453,8 @@ static int __init tcb_clksrc_init(struct device_node *node) if (ret) goto err_unregister_clksrc; + sched_clock_register(tc_sched_clock, 32, divided_rate); + return 0; err_unregister_clksrc: -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-04-03 14:12 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-04-03 14:11 [PATCH 00/12] clocksource: improve Atmel TCB timer driver Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 01/12] ARM: at91: move SoC specific definitions to SoC folder Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:36 ` Thierry Reding 2019-04-03 14:36 ` Thierry Reding 2019-04-03 17:36 ` Arnd Bergmann 2019-04-03 17:36 ` Arnd Bergmann 2019-04-03 14:11 ` [PATCH 02/12] misc: atmel_tclib: drop AVR32 support Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 03/12] misc: atmel_tclib: move definitions to header file Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-11 15:00 ` Daniel Lezcano 2019-04-11 15:00 ` Daniel Lezcano 2019-04-15 14:22 ` Alexandre Belloni 2019-04-15 14:22 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 04/12] clocksource/drivers/tcb_clksrc: stop depending on atmel_tclib Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-11 16:19 ` Daniel Lezcano 2019-04-11 16:19 ` Daniel Lezcano 2019-04-15 14:14 ` Alexandre Belloni 2019-04-15 14:14 ` Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni [this message] 2019-04-03 14:11 ` [PATCH 05/12] clocksource/drivers/tcb_clksrc: Use tcb as sched_clock Alexandre Belloni 2019-04-03 14:11 ` [PATCH 06/12] ARM: at91: Implement clocksource selection Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 07/12] clocksource/drivers/tcb_clksrc: move Kconfig option Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 08/12] clocksource/drivers/timer-atmel-pit: rework " Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 09/12] clocksource/drivers/tcb_clksrc: Rename the file for consistency Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 10/12] ARM: configs: at91: unselect PIT Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-03 14:11 ` [PATCH 11/12] misc: atmel_tclib: do not probe already used TCBs Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-25 20:18 ` Greg Kroah-Hartman 2019-04-25 20:18 ` Greg Kroah-Hartman 2019-04-03 14:11 ` [PATCH 12/12] clocksource/drivers/timer-atmel-tcb: Use ARRAY_SIZE instead of hardcoded size Alexandre Belloni 2019-04-03 14:11 ` Alexandre Belloni 2019-04-11 16:34 ` [PATCH 00/12] clocksource: improve Atmel TCB timer driver Daniel Lezcano 2019-04-11 16:34 ` Daniel Lezcano
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