gpio config

hc

2024-11-01 830ce1f69238136c0197858242f16cf44e0d6cb9

 kernel/include/linux/interrupt.h
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@@ -61,6 +61,12 @@
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  *                interrupt handler after suspending interrupts. For system
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  *                wakeup devices users need to implement wakeup detection in
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  *                their interrupt handlers.
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+ * IRQF_OOB - Interrupt is attached to an out-of-band handler living
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+ *            on the heading stage of the interrupt pipeline
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+ *            (CONFIG_IRQ_PIPELINE).  It may be delivered to the
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+ *            handler any time interrupts are enabled in the CPU,
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+ *            regardless of the (virtualized) interrupt state
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+ *            maintained by local_irq_save/disable().
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  */
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 #define IRQF_SHARED		0x00000080
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 #define IRQF_PROBE_SHARED	0x00000100
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@@ -74,6 +80,7 @@
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 #define IRQF_NO_THREAD		0x00010000
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 #define IRQF_EARLY_RESUME	0x00020000
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 #define IRQF_COND_SUSPEND	0x00040000
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+#define IRQF_OOB		0x00080000
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 #define IRQF_TIMER		(__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
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@@ -514,9 +521,29 @@
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  * to ensure that after a local_irq_disable(), interrupts have
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  * really been disabled in hardware. Such architectures need to
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  * implement the following hook.
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+ *
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+ * Those cases also apply when interrupt pipelining is in effect,
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+ * since we are virtualizing the interrupt disable state here too.
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  */
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 #ifndef hard_irq_disable
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-#define hard_irq_disable()	do { } while(0)
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+#define hard_irq_disable()	hard_cond_local_irq_disable()
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+#endif
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+
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+/*
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+ * Unlike other virtualized interrupt disabling schemes may assume, we
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+ * can't expect local_irq_restore() to turn hard interrupts on when
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+ * pipelining.  hard_irq_enable() is introduced to be paired with
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+ * hard_irq_disable(), for unconditionally turning them on. The only
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+ * sane sequence mixing virtual and real disable state manipulation
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+ * is:
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+ *
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+ * 1. local_irq_save/disable
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+ * 2. hard_irq_disable
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+ * 3. hard_irq_enable
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+ * 4. local_irq_restore/enable
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+ */
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+#ifndef hard_irq_enable
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+#define hard_irq_enable()	hard_cond_local_irq_enable()
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 #endif
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 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high