diff options
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r-- | arch/powerpc/kernel/rtas.c | 105 |
1 files changed, 70 insertions, 35 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 0e1ec6f746f..41cfde0ca11 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -47,14 +47,6 @@ struct rtas_t rtas = { }; EXPORT_SYMBOL(rtas); -struct rtas_suspend_me_data { - atomic_t working; /* number of cpus accessing this struct */ - atomic_t done; - int token; /* ibm,suspend-me */ - int error; - struct completion *complete; /* wait on this until working == 0 */ -}; - DEFINE_SPINLOCK(rtas_data_buf_lock); EXPORT_SYMBOL(rtas_data_buf_lock); @@ -714,14 +706,53 @@ void rtas_os_term(char *str) static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; #ifdef CONFIG_PPC_PSERIES -static void rtas_percpu_suspend_me(void *info) +static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) +{ + u16 slb_size = mmu_slb_size; + int rc = H_MULTI_THREADS_ACTIVE; + int cpu; + + slb_set_size(SLB_MIN_SIZE); + printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); + + while (rc == H_MULTI_THREADS_ACTIVE && !atomic_read(&data->done) && + !atomic_read(&data->error)) + rc = rtas_call(data->token, 0, 1, NULL); + + if (rc || atomic_read(&data->error)) { + printk(KERN_DEBUG "ibm,suspend-me returned %d\n", rc); + slb_set_size(slb_size); + } + + if (atomic_read(&data->error)) + rc = atomic_read(&data->error); + + atomic_set(&data->error, rc); + + if (wake_when_done) { + atomic_set(&data->done, 1); + + for_each_online_cpu(cpu) + plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); + } + + if (atomic_dec_return(&data->working) == 0) + complete(data->complete); + + return rc; +} + +int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data) +{ + atomic_inc(&data->working); + return __rtas_suspend_last_cpu(data, 0); +} + +static int __rtas_suspend_cpu(struct rtas_suspend_me_data *data, int wake_when_done) { long rc = H_SUCCESS; unsigned long msr_save; - u16 slb_size = mmu_slb_size; int cpu; - struct rtas_suspend_me_data *data = - (struct rtas_suspend_me_data *)info; atomic_inc(&data->working); @@ -729,7 +760,7 @@ static void rtas_percpu_suspend_me(void *info) msr_save = mfmsr(); mtmsr(msr_save & ~(MSR_EE)); - while (rc == H_SUCCESS && !atomic_read(&data->done)) + while (rc == H_SUCCESS && !atomic_read(&data->done) && !atomic_read(&data->error)) rc = plpar_hcall_norets(H_JOIN); mtmsr(msr_save); @@ -741,33 +772,37 @@ static void rtas_percpu_suspend_me(void *info) /* All other cpus are in H_JOIN, this cpu does * the suspend. */ - slb_set_size(SLB_MIN_SIZE); - printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", - smp_processor_id()); - data->error = rtas_call(data->token, 0, 1, NULL); - - if (data->error) { - printk(KERN_DEBUG "ibm,suspend-me returned %d\n", - data->error); - slb_set_size(slb_size); - } + return __rtas_suspend_last_cpu(data, wake_when_done); } else { printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", smp_processor_id(), rc); - data->error = rc; + atomic_set(&data->error, rc); } - atomic_set(&data->done, 1); + if (wake_when_done) { + atomic_set(&data->done, 1); - /* This cpu did the suspend or got an error; in either case, - * we need to prod all other other cpus out of join state. - * Extra prods are harmless. - */ - for_each_online_cpu(cpu) - plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); + /* This cpu did the suspend or got an error; in either case, + * we need to prod all other other cpus out of join state. + * Extra prods are harmless. + */ + for_each_online_cpu(cpu) + plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu)); + } out: if (atomic_dec_return(&data->working) == 0) complete(data->complete); + return rc; +} + +int rtas_suspend_cpu(struct rtas_suspend_me_data *data) +{ + return __rtas_suspend_cpu(data, 0); +} + +static void rtas_percpu_suspend_me(void *info) +{ + __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); } static int rtas_ibm_suspend_me(struct rtas_args *args) @@ -802,22 +837,22 @@ static int rtas_ibm_suspend_me(struct rtas_args *args) atomic_set(&data.working, 0); atomic_set(&data.done, 0); + atomic_set(&data.error, 0); data.token = rtas_token("ibm,suspend-me"); - data.error = 0; data.complete = &done; /* Call function on all CPUs. One of us will make the * rtas call */ if (on_each_cpu(rtas_percpu_suspend_me, &data, 0)) - data.error = -EINVAL; + atomic_set(&data.error, -EINVAL); wait_for_completion(&done); - if (data.error != 0) + if (atomic_read(&data.error) != 0) printk(KERN_ERR "Error doing global join\n"); - return data.error; + return atomic_read(&data.error); } #else /* CONFIG_PPC_PSERIES */ static int rtas_ibm_suspend_me(struct rtas_args *args) |