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Commit a8c8a367 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Linus Torvalds
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[PATCH] x86_64 irq: Refactor setup_IO_APIC_irq 



Currently we have two routines that do practically the same thing
setup_IO_APIC_irq and io_apic_set_pci_routing.  This patch makes
setup_IO_APIC_irq the common factor of these two previous routines.
For setup_IO_APIC_irq all that was needed was to pass the trigger
and polarity to make the code a proper subset of io_apic_set_pci_routing.

Hopefully consolidating these two routines will improve maintenance
there were several differences that simply appear to be one routine
or the other getting it wrong.

Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a27bc06d

arch/x86_64/kernel/io_apic.c

+34 −92
Original line number Diff line number Diff line
@@ -615,22 +615,6 @@ static int pin_2_irq(int idx, int apic, int pin) 
	return irq;

}



static inline int IO_APIC_irq_trigger(int irq)

{

	int apic, idx, pin;



	for (apic = 0; apic < nr_ioapics; apic++) {

		for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {

			idx = find_irq_entry(apic,pin,mp_INT);

			if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))

				return irq_trigger(idx);

		}

	}

	/*

	 * nonexistent IRQs are edge default

	 */

	return 0;

}



/* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */

static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = {
@@ -795,26 +779,36 @@ void __setup_vector_irq(int cpu) 


static struct irq_chip ioapic_chip;



#define IOAPIC_AUTO	-1

#define IOAPIC_EDGE	0

#define IOAPIC_LEVEL	1



static void ioapic_register_intr(int irq, unsigned long trigger)

{

	if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||

			trigger == IOAPIC_LEVEL)

	if (trigger)

		set_irq_chip_and_handler_name(irq, &ioapic_chip,

					      handle_fasteoi_irq, "fasteoi");

	else

		set_irq_chip_and_handler_name(irq, &ioapic_chip,

					      handle_edge_irq, "edge");

}

static void __init setup_IO_APIC_irq(int apic, int pin, int idx, int irq)



static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,

			      int trigger, int polarity)

{

	struct IO_APIC_route_entry entry;

	cpumask_t mask;

	int vector;

	unsigned long flags;



	if (!IO_APIC_IRQ(irq))

		return;



	vector = assign_irq_vector(irq, TARGET_CPUS, &mask);

	if (vector < 0)

		return;



	apic_printk(APIC_VERBOSE,KERN_DEBUG

		    "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "

		    "IRQ %d Mode:%i Active:%i)\n",

		    apic, mp_ioapics[apic].mpc_apicid, pin, vector,

		    irq, trigger, polarity);



	/*

	 * add it to the IO-APIC irq-routing table:
@@ -823,41 +817,27 @@ static void __init setup_IO_APIC_irq(int apic, int pin, int idx, int irq) 


	entry.delivery_mode = INT_DELIVERY_MODE;

	entry.dest_mode = INT_DEST_MODE;

	entry.dest = cpu_mask_to_apicid(mask);

	entry.mask = 0;				/* enable IRQ */

	entry.dest = cpu_mask_to_apicid(TARGET_CPUS);



	entry.trigger = irq_trigger(idx);

	entry.polarity = irq_polarity(idx);

	entry.trigger = trigger;

	entry.polarity = polarity;

	entry.vector = vector;



	if (irq_trigger(idx)) {

		entry.trigger = 1;

	/* Mask level triggered irqs.

	 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.

	 */

	if (trigger)

		entry.mask = 1;

		entry.dest = cpu_mask_to_apicid(TARGET_CPUS);

	}



	if (!apic && !IO_APIC_IRQ(irq))

		return;



	if (IO_APIC_IRQ(irq)) {

		cpumask_t mask;

		vector = assign_irq_vector(irq, TARGET_CPUS, &mask);

		if (vector < 0)

			return;



		entry.dest = cpu_mask_to_apicid(mask);

		entry.vector = vector;



		ioapic_register_intr(irq, IOAPIC_AUTO);

		if (!apic && (irq < 16))

	ioapic_register_intr(irq, trigger);

	if (irq < 16)

		disable_8259A_irq(irq);

	}



	ioapic_write_entry(apic, pin, entry);



	spin_lock_irqsave(&ioapic_lock, flags);

	irq_desc[irq].affinity = TARGET_CPUS;

	spin_unlock_irqrestore(&ioapic_lock, flags);



}



static void __init setup_IO_APIC_irqs(void)
@@ -882,8 +862,8 @@ static void __init setup_IO_APIC_irqs(void) 
		irq = pin_2_irq(idx, apic, pin);

		add_pin_to_irq(irq, apic, pin);



		setup_IO_APIC_irq(apic, pin, idx, irq);



		setup_IO_APIC_irq(apic, pin, irq,

				  irq_trigger(idx), irq_polarity(idx));

	}

	}
@@ -2090,11 +2070,6 @@ int __init io_apic_get_redir_entries (int ioapic) 


int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)

{

	struct IO_APIC_route_entry entry;

	unsigned long flags;

	int vector;

	cpumask_t mask;



	if (!IO_APIC_IRQ(irq)) {

		apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",

			ioapic);
@@ -2107,42 +2082,7 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p 
	if (irq >= 16)

		add_pin_to_irq(irq, ioapic, pin);





	vector = assign_irq_vector(irq, TARGET_CPUS, &mask);

	if (vector < 0)

		return vector;



	/*

	 * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.

	 * Note that we mask (disable) IRQs now -- these get enabled when the

	 * corresponding device driver registers for this IRQ.

	 */



	memset(&entry,0,sizeof(entry));



	entry.delivery_mode = INT_DELIVERY_MODE;

	entry.dest_mode = INT_DEST_MODE;

	entry.dest = cpu_mask_to_apicid(mask);

	entry.trigger = triggering;

	entry.polarity = polarity;

	entry.mask = 1;					 /* Disabled (masked) */

	entry.vector = vector & 0xff;



	apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> "

		"IRQ %d Mode:%i Active:%i)\n", ioapic, 

	       mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,

	       triggering, polarity);



	ioapic_register_intr(irq, triggering);



	if (!ioapic && (irq < 16))

		disable_8259A_irq(irq);



	ioapic_write_entry(ioapic, pin, entry);



	spin_lock_irqsave(&ioapic_lock, flags);

	irq_desc[irq].affinity = TARGET_CPUS;

	spin_unlock_irqrestore(&ioapic_lock, flags);

	setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);



	return 0;

}
@@ -2175,7 +2115,9 @@ void __init setup_ioapic_dest(void) 
			 * cpu is online.

			 */

			if(!irq_vector[irq])

				setup_IO_APIC_irq(ioapic, pin, irq_entry, irq);

				setup_IO_APIC_irq(ioapic, pin, irq,

						  irq_trigger(irq_entry),

						  irq_polarity(irq_entry));

			else

				set_ioapic_affinity_irq(irq, TARGET_CPUS);

		}