diff options
Diffstat (limited to 'arch/um/kernel/irq.c')
| -rw-r--r-- | arch/um/kernel/irq.c | 88 |
1 files changed, 87 insertions, 1 deletions
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c index 482269580b79..ea43312cbfd3 100644 --- a/arch/um/kernel/irq.c +++ b/arch/um/kernel/irq.c @@ -20,6 +20,7 @@ #include <os.h> #include <irq_user.h> #include <irq_kern.h> +#include <as-layout.h> extern void free_irqs(void); @@ -36,12 +37,14 @@ struct irq_reg { int events; bool active; bool pending; + bool wakeup; }; struct irq_entry { struct list_head list; int fd; struct irq_reg reg[NUM_IRQ_TYPES]; + bool suspended; }; static DEFINE_SPINLOCK(irq_lock); @@ -70,6 +73,11 @@ static void irq_io_loop(struct irq_reg *irq, struct uml_pt_regs *regs) } } +void sigio_handler_suspend(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs) +{ + /* nothing */ +} + void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs) { struct irq_entry *irq_entry; @@ -365,9 +373,86 @@ error: clear_bit(irq, irqs_allocated); return err; } - EXPORT_SYMBOL(um_request_irq); +#ifdef CONFIG_PM_SLEEP +void um_irqs_suspend(void) +{ + struct irq_entry *entry; + unsigned long flags; + + sig_info[SIGIO] = sigio_handler_suspend; + + spin_lock_irqsave(&irq_lock, flags); + list_for_each_entry(entry, &active_fds, list) { + enum um_irq_type t; + bool wake = false; + + for (t = 0; t < NUM_IRQ_TYPES; t++) { + if (!entry->reg[t].events) + continue; + + if (entry->reg[t].wakeup) { + wake = true; + break; + } + } + + if (!wake) { + entry->suspended = true; + os_clear_fd_async(entry->fd); + } + } + spin_unlock_irqrestore(&irq_lock, flags); +} + +void um_irqs_resume(void) +{ + struct irq_entry *entry; + unsigned long flags; + + spin_lock_irqsave(&irq_lock, flags); + list_for_each_entry(entry, &active_fds, list) { + if (entry->suspended) { + int err = os_set_fd_async(entry->fd); + + WARN(err < 0, "os_set_fd_async returned %d\n", err); + entry->suspended = false; + } + } + spin_unlock_irqrestore(&irq_lock, flags); + + sig_info[SIGIO] = sigio_handler; + send_sigio_to_self(); +} + +static int normal_irq_set_wake(struct irq_data *d, unsigned int on) +{ + struct irq_entry *entry; + unsigned long flags; + + spin_lock_irqsave(&irq_lock, flags); + list_for_each_entry(entry, &active_fds, list) { + enum um_irq_type t; + + for (t = 0; t < NUM_IRQ_TYPES; t++) { + if (!entry->reg[t].events) + continue; + + if (entry->reg[t].irq != d->irq) + continue; + entry->reg[t].wakeup = on; + goto unlock; + } + } +unlock: + spin_unlock_irqrestore(&irq_lock, flags); + return 0; +} +#else +#define normal_irq_set_wake NULL +#endif + /* * irq_chip must define at least enable/disable and ack when * the edge handler is used. @@ -384,6 +469,7 @@ static struct irq_chip normal_irq_type = { .irq_ack = dummy, .irq_mask = dummy, .irq_unmask = dummy, + .irq_set_wake = normal_irq_set_wake, }; static struct irq_chip alarm_irq_type = { |