[patch 21/32] tile: Use SPARSE_IRQ

[Thomas Gleixner]

Get rid of the private allocator and switch over to sparse IRQs.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx>
---
 arch/tile/Kconfig           |    2 +
 arch/tile/include/asm/irq.h |    9 +++----
 arch/tile/kernel/irq.c      |   52 ++------------------------------------------
 3 files changed, 9 insertions(+), 54 deletions(-)

Index: tip/arch/tile/Kconfig
===================================================================
--- tip.orig/arch/tile/Kconfig
+++ tip/arch/tile/Kconfig
@@ -125,6 +125,8 @@ config HVC_TILE
 
 config TILEGX
 	bool "Building for TILE-Gx (64-bit) processor"
+	select SPARSE_IRQ
+	select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
 	select HAVE_FUNCTION_GRAPH_TRACER
Index: tip/arch/tile/include/asm/irq.h
===================================================================
--- tip.orig/arch/tile/include/asm/irq.h
+++ tip/arch/tile/include/asm/irq.h
@@ -18,10 +18,12 @@
 #include <linux/hardirq.h>
 
 /* The hypervisor interface provides 32 IRQs. */
-#define NR_IRQS 32
+#define NR_IRQS			32
 
 /* IRQ numbers used for linux IPIs. */
-#define IRQ_RESCHEDULE 0
+#define IRQ_RESCHEDULE	0
+/* Interrupts for dynamic allocation start at 1. Let the core allocate irq0 */
+#define NR_IRQS_LEGACY	1
 
 #define irq_canonicalize(irq)   (irq)
 
@@ -76,7 +78,4 @@ void tile_irq_activate(unsigned int irq,
 
 void setup_irq_regs(void);
 
-unsigned int irq_alloc_hwirq(int node);
-void irq_free_hwirq(unsigned int irq);
-
 #endif /* _ASM_TILE_IRQ_H */
Index: tip/arch/tile/kernel/irq.c
===================================================================
--- tip.orig/arch/tile/kernel/irq.c
+++ tip/arch/tile/kernel/irq.c
@@ -54,13 +54,6 @@ static DEFINE_PER_CPU(unsigned long, irq
  */
 static DEFINE_PER_CPU(int, irq_depth);
 
-/* State for allocating IRQs on Gx. */
-#if CHIP_HAS_IPI()
-static unsigned long available_irqs = ((1UL << NR_IRQS) - 1) &
-				      (~(1UL << IRQ_RESCHEDULE));
-static DEFINE_SPINLOCK(available_irqs_lock);
-#endif
-
 #if CHIP_HAS_IPI()
 /* Use SPRs to manipulate device interrupts. */
 #define mask_irqs(irq_mask) __insn_mtspr(SPR_IPI_MASK_SET_K, irq_mask)
@@ -278,50 +271,11 @@ int arch_show_interrupts(struct seq_file
 	return 0;
 }
 
-/*
- * Generic, controller-independent functions:
- */
-
 #if CHIP_HAS_IPI()
-int create_irq(void)
-{
-	unsigned long flags;
-	int result;
-
-	spin_lock_irqsave(&available_irqs_lock, flags);
-	if (available_irqs == 0)
-		result = -ENOMEM;
-	else {
-		result = __ffs(available_irqs);
-		available_irqs &= ~(1UL << result);
-		dynamic_irq_init(result);
-	}
-	spin_unlock_irqrestore(&available_irqs_lock, flags);
-
-	return result;
-}
-EXPORT_SYMBOL(create_irq);
-
-void destroy_irq(unsigned int irq)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&available_irqs_lock, flags);
-	available_irqs |= (1UL << irq);
-	dynamic_irq_cleanup(irq);
-	spin_unlock_irqrestore(&available_irqs_lock, flags);
-}
-EXPORT_SYMBOL(destroy_irq);
-
-unsigned int irq_alloc_hwirq(int node)
-{
-	int ret = create_irq();
-	return ret < 0 ? 0 : ret;
-}
-
-void irq_free_hwirq(unsigned int irq)
+int arch_setup_hwirq(unsigned int irq, int node)
 {
-	destroy_irq();
+	return irq >= NR_IRQS ? -EINVAL : 0;
 }
 
+void arch_teardown_hwirq(unsigned int irq) { }
 #endif


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