From 77bc8c28ddac90287bc42c129002eb703288d550 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Mon, 18 Jun 2018 17:32:30 +0200 Subject: ARM: mvebu: convert secondary CPU clock sync to hotplug state The current call site in boot_secondary is causing sleep in invalid context warnings, as this part of the code is running with interrrupts disabled and some of the calls into the clock framework might sleep on a mutex. Convert the secondary CPU clock sync to a hotplug state, which allows to call it from a sleepable context. Signed-off-by: Lucas Stach Signed-off-by: Gregory CLEMENT --- arch/arm/mach-mvebu/platsmp.c | 49 ++++++++++++++++++++----------------------- 1 file changed, 23 insertions(+), 26 deletions(-) (limited to 'arch/arm/mach-mvebu') diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c index 4ffbbd217e82..c130497dc6cc 100644 --- a/arch/arm/mach-mvebu/platsmp.c +++ b/arch/arm/mach-mvebu/platsmp.c @@ -35,6 +35,8 @@ #define AXP_BOOTROM_BASE 0xfff00000 #define AXP_BOOTROM_SIZE 0x100000 +static struct clk *boot_cpu_clk; + static struct clk *get_cpu_clk(int cpu) { struct clk *cpu_clk; @@ -48,30 +50,6 @@ static struct clk *get_cpu_clk(int cpu) return cpu_clk; } -static void set_secondary_cpu_clock(unsigned int cpu) -{ - int thiscpu; - unsigned long rate; - struct clk *cpu_clk; - - thiscpu = get_cpu(); - - cpu_clk = get_cpu_clk(thiscpu); - if (!cpu_clk) - goto out; - clk_prepare_enable(cpu_clk); - rate = clk_get_rate(cpu_clk); - - cpu_clk = get_cpu_clk(cpu); - if (!cpu_clk) - goto out; - clk_set_rate(cpu_clk, rate); - clk_prepare_enable(cpu_clk); - -out: - put_cpu(); -} - static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle) { int ret, hw_cpu; @@ -79,7 +57,6 @@ static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle) pr_info("Booting CPU %d\n", cpu); hw_cpu = cpu_logical_map(cpu); - set_secondary_cpu_clock(hw_cpu); mvebu_pmsu_set_cpu_boot_addr(hw_cpu, armada_xp_secondary_startup); /* @@ -122,6 +99,19 @@ static void __init armada_xp_smp_init_cpus(void) panic("Invalid number of CPUs in DT\n"); } +static int armada_xp_sync_secondary_clk(unsigned int cpu) +{ + struct clk *cpu_clk = get_cpu_clk(cpu); + + if (!cpu_clk || !boot_cpu_clk) + return 0; + + clk_prepare_enable(cpu_clk); + clk_set_rate(cpu_clk, clk_get_rate(boot_cpu_clk)); + + return 0; +} + static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus) { struct device_node *node; @@ -131,6 +121,14 @@ static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus) flush_cache_all(); set_cpu_coherent(); + boot_cpu_clk = get_cpu_clk(smp_processor_id()); + if (boot_cpu_clk) { + clk_prepare_enable(boot_cpu_clk); + cpuhp_setup_state_nocalls(CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, + "arm/mvebu/sync_clocks:online", + armada_xp_sync_secondary_clk, NULL); + } + /* * In order to boot the secondary CPUs we need to ensure * the bootROM is mapped at the correct address. @@ -223,7 +221,6 @@ static int mv98dx3236_boot_secondary(unsigned int cpu, struct task_struct *idle) int ret, hw_cpu; hw_cpu = cpu_logical_map(cpu); - set_secondary_cpu_clock(hw_cpu); mv98dx3236_resume_set_cpu_boot_addr(hw_cpu, armada_xp_secondary_startup); -- cgit v1.2.3