clocksource/drivers/arm_arch_timer: Control the evtstrm via the cmdline

Disabling the eventstream can be useful for both remotely debugging a
deployed production system and development of code using WFE-based
polling loops. Whilst this can currently be controlled via a Kconfig
option (CONFIG_ARM_ARCH_TIMER_EVTSTREAM), it's often desirable to toggle
the feature on the command line, so this patch adds a new command-line
option ("clocksource.arm_arch_timer.evtstrm") to do just that. The
default behaviour is determined based on CONFIG_ARM_ARCH_TIMER_EVTSTREAM.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 82b42c9..2c92f1d 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -687,6 +687,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        [SPARC64] tick
                        [X86-64] hpet,tsc
 
+       clocksource.arm_arch_timer.evtstrm=
+                       [ARM,ARM64]
+                       Format: <bool>
+                       Enable/disable the eventstream feature of the ARM
+                       architected timer so that code using WFE-based polling
+                       loops can be debugged more effectively on production
+                       systems.
+
        clearcpuid=BITNUM [X86]
                        Disable CPUID feature X for the kernel. See
                        arch/x86/include/asm/cpufeatures.h for the valid bit

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 7acdf3d..5677886 100644 (file)
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -288,14 +288,16 @@ config ARM_ARCH_TIMER
        select CLKSRC_ACPI if ACPI
 
 config ARM_ARCH_TIMER_EVTSTREAM
-       bool "Support for ARM architected timer event stream generation"
+       bool "Enable ARM architected timer event stream generation by default"
        default y if ARM_ARCH_TIMER
        depends on ARM_ARCH_TIMER
        help
-         This option enables support for event stream generation based on
-         the ARM architected timer. It is used for waking up CPUs executing
-         the wfe instruction at a frequency represented as a power-of-2
-         divisor of the clock rate.
+         This option enables support by default for event stream generation
+         based on the ARM architected timer. It is used for waking up CPUs
+         executing the wfe instruction at a frequency represented as a
+         power-of-2 divisor of the clock rate. The behaviour can also be
+         overridden on the command line using the
+         clocksource.arm_arch_timer.evtstream parameter.
          The main use of the event stream is wfe-based timeouts of userspace
          locking implementations. It might also be useful for imposing timeout
          on wfe to safeguard against any programming errors in case an expected

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 9e33309..5effd30 100644 (file)
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -79,6 +79,14 @@ static enum ppi_nr arch_timer_uses_ppi = VIRT_PPI;
 static bool arch_timer_c3stop;
 static bool arch_timer_mem_use_virtual;
 
+static bool evtstrm_enable = IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM);
+
+static int __init early_evtstrm_cfg(char *buf)
+{
+       return strtobool(buf, &evtstrm_enable);
+}
+early_param("clocksource.arm_arch_timer.evtstrm", early_evtstrm_cfg);
+
 /*
  * Architected system timer support.
  */
@@ -372,7 +380,7 @@ static int arch_timer_setup(struct clock_event_device *clk)
                enable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], 0);
 
        arch_counter_set_user_access();
-       if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM))
+       if (evtstrm_enable)
                arch_timer_configure_evtstream();
 
        return 0;