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Date: Fri, 23 Feb 2007 04:19:08 -0700
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Andrew Morton <akpm@...l.org>
Cc: linux-kernel@...r.kernel.org,
Zwane Mwaikambo <zwane@...radead.org>,
Ashok Raj <ashok.raj@...el.com>, Ingo Molnar <mingo@...e.hu>,
"Lu, Yinghai" <yinghai.lu@....com>,
Natalie Protasevich <protasnb@...il.com>,
Andi Kleen <ak@...e.de>,
"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 05/14] 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: Eric W. Biederman <ebiederm@...ssion.com>
---
arch/x86_64/kernel/io_apic.c | 126 +++++++++++------------------------------
1 files changed, 34 insertions(+), 92 deletions(-)
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index a69c38b..e064838 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -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))
- disable_8259A_irq(irq);
- }
+ 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);
}
--
1.5.0.g53756
-
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