Messages in this thread | | | Date | Fri, 24 Jan 2014 22:57:33 +0800 | From | Hanjun Guo <> | Subject | Re: [PATCH 11/20] ARM64 / ACPI: Get the enable method for SMP initialization |
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Hi Catalin,
On 2014年01月24日 01:50, Catalin Marinas wrote: > On Fri, Jan 17, 2014 at 12:25:05PM +0000, Hanjun Guo wrote: >> --- a/arch/arm64/kernel/smp.c >> +++ b/arch/arm64/kernel/smp.c >> @@ -48,6 +48,7 @@ >> #include <asm/sections.h> >> #include <asm/tlbflush.h> >> #include <asm/ptrace.h> >> +#include <asm/acpi.h> >> >> /* >> * as from 2.5, kernels no longer have an init_tasks structure >> @@ -280,7 +281,7 @@ static void (*smp_cross_call)(const struct cpumask *, unsigned int); >> * cpu logical map array containing MPIDR values related to logical >> * cpus. Assumes that cpu_logical_map(0) has already been initialized. >> */ >> -void __init smp_init_cpus(void) >> +static int __init of_smp_init_cpus(void) >> { >> struct device_node *dn = NULL; >> unsigned int i, cpu = 1; >> @@ -364,6 +365,10 @@ next: >> cpu++; >> } >> >> + /* No device tree or no CPU node in DT */ >> + if (cpu == 1 && !bootcpu_valid) >> + return -ENODEV; >> + >> /* sanity check */ >> if (cpu > NR_CPUS) >> pr_warning("no. of cores (%d) greater than configured maximum of %d - clipping\n", >> @@ -371,7 +376,7 @@ next: >> >> if (!bootcpu_valid) { >> pr_err("DT missing boot CPU MPIDR, not enabling secondaries\n"); >> - return; >> + return -EINVAL; >> } >> >> /* >> @@ -381,6 +386,39 @@ next: >> for (i = 0; i < NR_CPUS; i++) >> if (cpu_logical_map(i) != INVALID_HWID) >> set_cpu_possible(i, true); >> + >> + return 0; >> +} >> + >> +/* >> + * In ACPI mode, the cpu possible map was enumerated before SMP >> + * initialization when MADT table was parsed, so we can get the >> + * possible map here to initialize CPUs. >> + */ >> +static void __init acpi_smp_init_cpus(void) >> +{ >> + int cpu; >> + const char *enable_method; >> + >> + for_each_possible_cpu(cpu) { >> + enable_method = acpi_get_enable_method(cpu); >> + if (!enable_method) >> + continue; >> + >> + cpu_ops[cpu] = cpu_get_ops(enable_method); >> + if (!cpu_ops[cpu]) >> + continue; >> + >> + cpu_ops[cpu]->cpu_init(NULL, cpu); >> + } >> +} >> + >> +void __init smp_init_cpus(void) >> +{ >> + if (!of_smp_init_cpus()) >> + return; >> + >> + acpi_smp_init_cpus(); >> } > With DT we initialise the cpu_ops[0] via cpu_read_bootcpu_ops() called > from setup_arch(). This is needed because with PSCI we use cpu_ops for > power management even if it's a UP system. Do you get a some kernel > warning about device node for the boot cpu not found?
Thanks for pointing this out, actually we didn't find a dts file with spin-table method for SMP initialization, and this patch is not fully tested (only spin-table method is supported in ACPI now), we are working on that and get this patch fully tested.
I will review the code carefully in your comments, and update the code accordingly.
> >> --- a/drivers/acpi/plat/arm-core.c >> +++ b/drivers/acpi/plat/arm-core.c >> @@ -367,6 +367,32 @@ static void __init acpi_process_madt(void) >> } >> >> /* >> + * To see PCSI is enabled or not. >> + * >> + * PSCI is not available for ACPI 5.0, return FALSE for now. >> + * >> + * FIXME: should we introduce early_param("psci", func) for test purpose? >> + */ >> +static bool acpi_psci_smp_available(int cpu) >> +{ >> + return FALSE; >> +} >> + >> +static const char *enable_method[] = { >> + "psci", >> + "spin-table", >> + NULL >> +}; >> + >> +const char *acpi_get_enable_method(int cpu) >> +{ >> + if (acpi_psci_smp_available(cpu)) >> + return enable_method[0]; >> + else >> + return enable_method[1]; >> +} > You could just use literal strings here, actually even ignoring PSCI > until available.
Ok.
Thanks Hanjun
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