From: Fu Wei fu.wei@linaro.org
The patch refactor original arch_timer_uses_ppi init code: (1) Extract a subfunction: arch_timer_uses_ppi_init (2) Use the new subfunction in arch_timer_of_init and arch_timer_acpi_init
Signed-off-by: Fu Wei fu.wei@linaro.org --- drivers/clocksource/arm_arch_timer.c | 73 +++++++++++++++++++++--------------- 1 file changed, 42 insertions(+), 31 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 6de164f..af22953 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -821,40 +821,42 @@ static int __init arch_timer_common_init(void) return arch_timer_arch_init(); }
-static int __init arch_timer_init(void) +/* + * If HYP mode is available, we know that the physical timer + * has been configured to be accessible from PL1. Use it, so + * that a guest can use the virtual timer instead. + * + * If no interrupt provided for virtual timer, we'll have to + * stick to the physical timer. It'd better be accessible... + * On ARM64, we we only use ARCH_TIMER_PHYS_NONSECURE_PPI in Linux. + * + * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE + * accesses to CNTP_*_EL1 registers are silently redirected to + * their CNTHP_*_EL2 counterparts, and use a different PPI + * number. + */ +static int __init arch_timer_uses_ppi_init(void) { - int ret; - /* - * If HYP mode is available, we know that the physical timer - * has been configured to be accessible from PL1. Use it, so - * that a guest can use the virtual timer instead. - * - * If no interrupt provided for virtual timer, we'll have to - * stick to the physical timer. It'd better be accessible... - * - * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE - * accesses to CNTP_*_EL1 registers are silently redirected to - * their CNTHP_*_EL2 counterparts, and use a different PPI - * number. - */ - if (is_hyp_mode_available() || !arch_timer_ppi[ARCH_TIMER_VIRT_PPI]) { - bool has_ppi; - - if (is_kernel_in_hyp_mode()) { - arch_timer_uses_ppi = ARCH_TIMER_HYP_PPI; - has_ppi = !!arch_timer_ppi[ARCH_TIMER_HYP_PPI]; - } else { + if (is_hyp_mode_available() && is_kernel_in_hyp_mode()) { + arch_timer_uses_ppi = ARCH_TIMER_HYP_PPI; + } else if (!arch_timer_ppi[ARCH_TIMER_VIRT_PPI]) { + if (IS_ENABLED(CONFIG_ARM64)) + arch_timer_uses_ppi = ARCH_TIMER_PHYS_NONSECURE_PPI; + else arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI; - has_ppi = (!!arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] || - !!arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]); - } - - if (!has_ppi) { - pr_warn("No interrupt available, giving up\n"); - return -EINVAL; - } }
+ if (arch_timer_ppi[arch_timer_uses_ppi]) + return 0; + + pr_warn("No interrupt available, giving up\n"); + return -EINVAL; +} + +static int __init arch_timer_init(void) +{ + int ret; + ret = arch_timer_register(); if (ret) return ret; @@ -870,7 +872,7 @@ static int __init arch_timer_init(void)
static int __init arch_timer_of_init(struct device_node *np) { - int i; + int i, ret;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("multiple nodes in dt, skipping\n"); @@ -902,6 +904,10 @@ static int __init arch_timer_of_init(struct device_node *np) of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI;
+ ret = arch_timer_uses_ppi_init(); + if (ret) + return ret; + return arch_timer_init(); } CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); @@ -1011,6 +1017,7 @@ static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) /* Initialize per-processor generic timer */ static int __init arch_timer_acpi_init(struct acpi_table_header *table) { + int ret; struct acpi_table_gtdt *gtdt;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { @@ -1041,6 +1048,10 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) /* Get the frequency from CNTFRQ */ arch_timer_detect_rate(NULL, NULL);
+ ret = arch_timer_uses_ppi_init(); + if (ret) + return ret; + /* Always-on capability */ arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON);