diff mbox

[1/3] x86, irq: Rename VECTOR_UNDEFINED and VECTOR_RETRIGGERED to IRQ_*

Message ID 20150712220154.7166.48327.stgit@bhelgaas-glaptop2.roam.corp.google.com (mailing list archive)
State Awaiting Upstream
Headers show

Commit Message

Bjorn Helgaas July 12, 2015, 10:01 p.m. UTC 
The per-cpu vector_irq[] table is indexed by CPU vector numbers, and each
entry contains an IRQ number.

Rename the special values VECTOR_UNDEFINED and VECTOR_RETRIGGERED to
IRQ_UNDEFINED and IRQ_RETRIGGERED to indicate that they are in the IRQ
number space, not the CPU vector number space.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 arch/x86/include/asm/hw_irq.h |    4 ++--
 arch/x86/kernel/apic/vector.c |   14 +++++++-------
 arch/x86/kernel/irq.c         |   12 ++++++------
 arch/x86/kernel/irqinit.c     |    4 ++--
 4 files changed, 17 insertions(+), 17 deletions(-)


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Comments

Thomas Gleixner July 17, 2015, 2:06 p.m. UTC | #1 
On Sun, 12 Jul 2015, Bjorn Helgaas wrote:

> The per-cpu vector_irq[] table is indexed by CPU vector numbers, and each
> entry contains an IRQ number.
> 
> Rename the special values VECTOR_UNDEFINED and VECTOR_RETRIGGERED to
> IRQ_UNDEFINED and IRQ_RETRIGGERED to indicate that they are in the IRQ
> number space, not the CPU vector number space.

Makes some sense, but OTOH vector_irq actually reflects the vector
state not the irq number state. The fact that we store the Linux irq
number in vector_irq is just an implementation detail.

VECTOR_UNDEFINED is certainly a misnomer; that should be VECTOR_UNUSED

VECTOR_RETRIGGERED is pretty accurate. In the case we retrigger an
interrupt, we merily use the Linux irq number to figure out which
vector to kick. And after we retriggered it, we lose the association
to the Linux irq number completely.

That said, I'm working on storing the irq descriptor pointer in
vector_irq instead of the irq number, which has the advantage that we
avoid the lookup of the irq descriptor in the interrupt hotpath.

Thanks,

	tglx

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Bjorn Helgaas July 17, 2015, 5:50 p.m. UTC | #2 
On Fri, Jul 17, 2015 at 9:06 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Sun, 12 Jul 2015, Bjorn Helgaas wrote:
>
>> The per-cpu vector_irq[] table is indexed by CPU vector numbers, and each
>> entry contains an IRQ number.
>>
>> Rename the special values VECTOR_UNDEFINED and VECTOR_RETRIGGERED to
>> IRQ_UNDEFINED and IRQ_RETRIGGERED to indicate that they are in the IRQ
>> number space, not the CPU vector number space.
>
> Makes some sense, but OTOH vector_irq actually reflects the vector
> state not the irq number state. The fact that we store the Linux irq
> number in vector_irq is just an implementation detail.
>
> VECTOR_UNDEFINED is certainly a misnomer; that should be VECTOR_UNUSED
>
> VECTOR_RETRIGGERED is pretty accurate. In the case we retrigger an
> interrupt, we merily use the Linux irq number to figure out which
> vector to kick. And after we retriggered it, we lose the association
> to the Linux irq number completely.
>
> That said, I'm working on storing the irq descriptor pointer in
> vector_irq instead of the irq number, which has the advantage that we
> avoid the lookup of the irq descriptor in the interrupt hotpath.

OK, I'll abandon this.  Thanks for taking a look!

Bjorn
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diff mbox

Patch

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 6615032..b51a1ca 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -182,8 +182,8 @@  extern char irq_entries_start[];
 #define trace_irq_entries_start irq_entries_start
 #endif
 
-#define VECTOR_UNDEFINED	(-1)
-#define VECTOR_RETRIGGERED	(-2)
+#define IRQ_UNDEFINED	(-1)
+#define IRQ_RETRIGGERED	(-2)
 
 typedef int vector_irq_t[NR_VECTORS];
 DECLARE_PER_CPU(vector_irq_t, vector_irq);
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 28eba2d..8ae84b4 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -170,7 +170,7 @@  next:
 
 		for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask) {
 			if (per_cpu(vector_irq, new_cpu)[vector] >
-			    VECTOR_UNDEFINED)
+			    IRQ_UNDEFINED)
 				goto next;
 		}
 		/* Found one! */
@@ -232,7 +232,7 @@  static void clear_irq_vector(int irq, struct apic_chip_data *data)
 
 	vector = data->cfg.vector;
 	for_each_cpu_and(cpu, data->domain, cpu_online_mask)
-		per_cpu(vector_irq, cpu)[vector] = VECTOR_UNDEFINED;
+		per_cpu(vector_irq, cpu)[vector] = IRQ_UNDEFINED;
 
 	data->cfg.vector = 0;
 	cpumask_clear(data->domain);
@@ -247,7 +247,7 @@  static void clear_irq_vector(int irq, struct apic_chip_data *data)
 		     vector++) {
 			if (per_cpu(vector_irq, cpu)[vector] != irq)
 				continue;
-			per_cpu(vector_irq, cpu)[vector] = VECTOR_UNDEFINED;
+			per_cpu(vector_irq, cpu)[vector] = IRQ_UNDEFINED;
 			break;
 		}
 	}
@@ -429,12 +429,12 @@  static void __setup_vector_irq(int cpu)
 	/* Mark the free vectors */
 	for (vector = 0; vector < NR_VECTORS; ++vector) {
 		irq = per_cpu(vector_irq, cpu)[vector];
-		if (irq <= VECTOR_UNDEFINED)
+		if (irq <= IRQ_UNDEFINED)
 			continue;
 
 		data = apic_chip_data(irq_get_irq_data(irq));
 		if (!cpumask_test_cpu(cpu, data->domain))
-			per_cpu(vector_irq, cpu)[vector] = VECTOR_UNDEFINED;
+			per_cpu(vector_irq, cpu)[vector] = IRQ_UNDEFINED;
 	}
 	raw_spin_unlock(&vector_lock);
 }
@@ -553,7 +553,7 @@  asmlinkage __visible void smp_irq_move_cleanup_interrupt(void)
 
 		irq = __this_cpu_read(vector_irq[vector]);
 
-		if (irq <= VECTOR_UNDEFINED)
+		if (irq <= IRQ_UNDEFINED)
 			continue;
 
 		desc = irq_to_desc(irq);
@@ -589,7 +589,7 @@  asmlinkage __visible void smp_irq_move_cleanup_interrupt(void)
 			apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
 			goto unlock;
 		}
-		__this_cpu_write(vector_irq[vector], VECTOR_UNDEFINED);
+		__this_cpu_write(vector_irq[vector], IRQ_UNDEFINED);
 unlock:
 		raw_spin_unlock(&desc->lock);
 	}
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 88b36648..2949c6e 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -223,12 +223,12 @@  __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
 	if (!handle_irq(irq, regs)) {
 		ack_APIC_irq();
 
-		if (irq != VECTOR_RETRIGGERED) {
+		if (irq != IRQ_RETRIGGERED) {
 			pr_emerg_ratelimited("%s: %d.%d No irq handler for vector (irq %d)\n",
 					     __func__, smp_processor_id(),
 					     vector, irq);
 		} else {
-			__this_cpu_write(vector_irq[vector], VECTOR_UNDEFINED);
+			__this_cpu_write(vector_irq[vector], IRQ_UNDEFINED);
 		}
 	}
 
@@ -489,7 +489,7 @@  void fixup_irqs(void)
 	for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
 		unsigned int irr;
 
-		if (__this_cpu_read(vector_irq[vector]) <= VECTOR_UNDEFINED)
+		if (__this_cpu_read(vector_irq[vector]) <= IRQ_UNDEFINED)
 			continue;
 
 		irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
@@ -502,12 +502,12 @@  void fixup_irqs(void)
 			raw_spin_lock(&desc->lock);
 			if (chip->irq_retrigger) {
 				chip->irq_retrigger(data);
-				__this_cpu_write(vector_irq[vector], VECTOR_RETRIGGERED);
+				__this_cpu_write(vector_irq[vector], IRQ_RETRIGGERED);
 			}
 			raw_spin_unlock(&desc->lock);
 		}
-		if (__this_cpu_read(vector_irq[vector]) != VECTOR_RETRIGGERED)
-			__this_cpu_write(vector_irq[vector], VECTOR_UNDEFINED);
+		if (__this_cpu_read(vector_irq[vector]) != IRQ_RETRIGGERED)
+			__this_cpu_write(vector_irq[vector], IRQ_UNDEFINED);
 	}
 }
 #endif
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index a3a5e15..fc1822d 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -52,7 +52,7 @@  static struct irqaction irq2 = {
 };
 
 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
-	[0 ... NR_VECTORS - 1] = VECTOR_UNDEFINED,
+	[0 ... NR_VECTORS - 1] = IRQ_UNDEFINED,
 };
 
 int vector_used_by_percpu_irq(unsigned int vector)
@@ -60,7 +60,7 @@  int vector_used_by_percpu_irq(unsigned int vector)
 	int cpu;
 
 	for_each_online_cpu(cpu) {
-		if (per_cpu(vector_irq, cpu)[vector] > VECTOR_UNDEFINED)
+		if (per_cpu(vector_irq, cpu)[vector] > IRQ_UNDEFINED)
 			return 1;
 	}