MIPS: SMTC: Cleanup the hook mess and use irq_data

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2194/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/irq.h

@@ -57,7 +57,7 @@ static inline void smtc_im_ack_irq(unsigned int irq)
 
 extern int plat_set_irq_affinity(struct irq_data *d,
 				 const struct cpumask *affinity, bool force);
-extern void smtc_forward_irq(unsigned int irq);
+extern void smtc_forward_irq(struct irq_data *d);
 
 /*
  * IRQ affinity hook invoked at the beginning of interrupt dispatch
@@ -70,51 +70,53 @@ extern void smtc_forward_irq(unsigned int irq);
  * cpumask implementations, this version is optimistically assuming
  * that cpumask.h macro overhead is reasonable during interrupt dispatch.
  */
-#define IRQ_AFFINITY_HOOK(irq)						\
-do {									\
-    if (!cpumask_test_cpu(smp_processor_id(), irq_desc[irq].affinity)) {\
-	smtc_forward_irq(irq);						\
-	irq_exit();							\
-	return;								\
-    }									\
-} while (0)
+static inline int handle_on_other_cpu(unsigned int irq)
+{
+	struct irq_data *d = irq_get_irq_data(irq);
+
+	if (cpumask_test_cpu(smp_processor_id(), d->affinity))
+		return 0;
+	smtc_forward_irq(d);
+	return 1;
+}
 
 #else /* Not doing SMTC affinity */
 
-#define IRQ_AFFINITY_HOOK(irq) do { } while (0)
+static inline int handle_on_other_cpu(unsigned int irq) { return 0; }
 
 #endif /* CONFIG_MIPS_MT_SMTC_IRQAFF */
 
 #ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
 
+static inline void smtc_im_backstop(unsigned int irq)
+{
+	if (irq_hwmask[irq] & 0x0000ff00)
+		write_c0_tccontext(read_c0_tccontext() &
+				   ~(irq_hwmask[irq] & 0x0000ff00));
+}
+
 /*
  * Clear interrupt mask handling "backstop" if irq_hwmask
  * entry so indicates. This implies that the ack() or end()
  * functions will take over re-enabling the low-level mask.
  * Otherwise it will be done on return from exception.
  */
-#define __DO_IRQ_SMTC_HOOK(irq)						\
-do {									\
-	IRQ_AFFINITY_HOOK(irq);						\
-	if (irq_hwmask[irq] & 0x0000ff00)				\
-		write_c0_tccontext(read_c0_tccontext() &		\
-				   ~(irq_hwmask[irq] & 0x0000ff00));	\
-} while (0)
-
-#define __NO_AFFINITY_IRQ_SMTC_HOOK(irq)				\
-do {									\
-	if (irq_hwmask[irq] & 0x0000ff00)                               \
-		write_c0_tccontext(read_c0_tccontext() &		\
-				   ~(irq_hwmask[irq] & 0x0000ff00));	\
-} while (0)
+static inline int smtc_handle_on_other_cpu(unsigned int irq)
+{
+	int ret = handle_on_other_cpu(irq);
+
+	if (!ret)
+		smtc_im_backstop(irq);
+	return ret;
+}
 
 #else
 
-#define __DO_IRQ_SMTC_HOOK(irq)						\
-do {									\
-	IRQ_AFFINITY_HOOK(irq);						\
-} while (0)
-#define __NO_AFFINITY_IRQ_SMTC_HOOK(irq) do { } while (0)
+static inline void smtc_im_backstop(unsigned int irq) { }
+static inline int smtc_handle_on_other_cpu(unsigned int irq)
+{
+	return handle_on_other_cpu(irq);
+}
 
 #endif
 

arch/mips/kernel/irq.c

@@ -183,8 +183,8 @@ void __irq_entry do_IRQ(unsigned int irq)
 {
 	irq_enter();
 	check_stack_overflow();
-	__DO_IRQ_SMTC_HOOK(irq);
-	generic_handle_irq(irq);
+	if (!smtc_handle_on_other_cpu(irq))
+		generic_handle_irq(irq);
 	irq_exit();
 }
 
@@ -197,7 +197,7 @@ void __irq_entry do_IRQ(unsigned int irq)
 void __irq_entry do_IRQ_no_affinity(unsigned int irq)
 {
 	irq_enter();
-	__NO_AFFINITY_IRQ_SMTC_HOOK(irq);
+	smtc_im_backstop(irq);
 	generic_handle_irq(irq);
 	irq_exit();
 }

arch/mips/kernel/smtc.c

@@ -677,9 +677,9 @@ void smtc_set_irq_affinity(unsigned int irq, cpumask_t affinity)
 	 */
 }
 
-void smtc_forward_irq(unsigned int irq)
+void smtc_forward_irq(struct irq_data *d)
 {
-	struct irq_data *d = irq_get_irq_data(irq);
+	unsigned int irq = d->irq;
 	int target;
 
 	/*
@@ -708,12 +708,10 @@ void smtc_forward_irq(unsigned int irq)
 	 */
 
 	/* If no one is eligible, service locally */
-	if (target >= NR_CPUS) {
+	if (target >= NR_CPUS)
 		do_IRQ_no_affinity(irq);
-		return;
-	}
-
-	smtc_send_ipi(target, IRQ_AFFINITY_IPI, irq);
+	else
+		smtc_send_ipi(target, IRQ_AFFINITY_IPI, irq);
 }
 
 #endif /* CONFIG_MIPS_MT_SMTC_IRQAFF */