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| author | David S. Miller <davem@sunset.davemloft.net> | 2007-07-14 03:14:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-16 04:05:07 -0700 |
| commit | bd0e11ff221d929b2b711ce3e5712e097e9dd1d8 (patch) | |
| tree | b4b7a44d336029908245396f40c7832c1898d91b /arch | |
| parent | 8b99cfb8cc51adae7f5294c8962a026c63100959 (diff) | |
| download | linux-bd0e11ff221d929b2b711ce3e5712e097e9dd1d8.tar.gz | |
[SPARC64]: Process dr-cpu events in a kthread instead of workqueue.
This will be necessary to handle unconfigure requests properly. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc64/kernel/ds.c | 42 |
1 files changed, 34 insertions, 8 deletions
diff --git a/arch/sparc64/kernel/ds.c b/arch/sparc64/kernel/ds.c index 0cb96dc399b7..d412cf876ab4 100644 --- a/arch/sparc64/kernel/ds.c +++ b/arch/sparc64/kernel/ds.c @@ -12,7 +12,7 @@ #include <linux/sched.h> #include <linux/delay.h> #include <linux/mutex.h> -#include <linux/workqueue.h> +#include <linux/kthread.h> #include <linux/cpu.h> #include <asm/ldc.h> @@ -395,6 +395,7 @@ struct dr_cpu_resp_entry { * ds_lock, and processed by dr_cpu_process() in order. */ static LIST_HEAD(dr_cpu_work_list); +static DECLARE_WAIT_QUEUE_HEAD(dr_cpu_wait); struct dr_cpu_queue_entry { struct list_head list; @@ -533,10 +534,13 @@ static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num, printk(KERN_INFO PFX "Starting cpu %d...\n", cpu); err = cpu_up(cpu); - if (err) + if (err) { + printk(KERN_INFO PFX "CPU startup failed err=%d\n", + err); dr_cpu_mark(resp, cpu, ncpus, DR_CPU_RES_FAILURE, DR_CPU_STAT_UNCONFIGURED); + } } spin_lock_irqsave(&ds_lock, flags); @@ -569,18 +573,16 @@ static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num, return -EOPNOTSUPP; } -static void dr_cpu_process(struct work_struct *work) +static void process_dr_cpu_list(struct ds_cap_state *cp) { struct dr_cpu_queue_entry *qp, *tmp; - struct ds_cap_state *cp; unsigned long flags; LIST_HEAD(todo); cpumask_t mask; - cp = find_cap_by_string("dr-cpu"); - spin_lock_irqsave(&ds_lock, flags); list_splice(&dr_cpu_work_list, &todo); + INIT_LIST_HEAD(&dr_cpu_work_list); spin_unlock_irqrestore(&ds_lock, flags); list_for_each_entry_safe(qp, tmp, &todo, list) { @@ -627,7 +629,27 @@ next: } } -static DECLARE_WORK(dr_cpu_work, dr_cpu_process); +static int dr_cpu_thread(void *__unused) +{ + struct ds_cap_state *cp; + DEFINE_WAIT(wait); + + cp = find_cap_by_string("dr-cpu"); + + while (1) { + prepare_to_wait(&dr_cpu_wait, &wait, TASK_INTERRUPTIBLE); + if (list_empty(&dr_cpu_work_list)) + schedule(); + finish_wait(&dr_cpu_wait, &wait); + + if (kthread_should_stop()) + break; + + process_dr_cpu_list(cp); + } + + return 0; +} static void dr_cpu_data(struct ldc_channel *lp, struct ds_cap_state *dp, @@ -648,7 +670,7 @@ static void dr_cpu_data(struct ldc_channel *lp, } else { memcpy(&qp->req, buf, len); list_add_tail(&qp->list, &dr_cpu_work_list); - schedule_work(&dr_cpu_work); + wake_up(&dr_cpu_wait); } } #endif @@ -1095,6 +1117,10 @@ static int __init ds_init(void) for (i = 0; i < ARRAY_SIZE(ds_states); i++) ds_states[i].handle = ((u64)i << 32); +#ifdef CONFIG_HOTPLUG_CPU + kthread_run(dr_cpu_thread, NULL, "kdrcpud"); +#endif + return vio_register_driver(&ds_driver); } |