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authorEric W. Biederman <ebiederm@xmission.com>2006-11-08 17:44:57 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-11-08 18:29:24 -0800
commitec68307cc5a8dc499e48693843bb42f6b6028458 (patch)
treeba735cbdc35819837bc53ef1385a478f5800fd7a /arch/i386
parent64d9fe6973a9348e5211f3cc9f04b899329caeb4 (diff)
downloadop-kernel-dev-ec68307cc5a8dc499e48693843bb42f6b6028458.zip
op-kernel-dev-ec68307cc5a8dc499e48693843bb42f6b6028458.tar.gz
[PATCH] htirq: refactor so we only have one function that writes to the chip
This refactoring actually optimizes the code a little by caching the value that we think the device is programmed with instead of reading it back from the hardware. Which simplifies the code a little and should speed things up a bit. This patch introduces the concept of a ht_irq_msg and modifies the architecture read/write routines to update this code. There is a minor consistency fix here as well as x86_64 forgot to initialize the htirq as masked. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Andi Kleen <ak@suse.de> Acked-by: Bryan O'Sullivan <bos@pathscale.com> Cc: <olson@pathscale.com> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/io_apic.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 507983c..ad84bc2 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -2624,18 +2624,16 @@ void arch_teardown_msi_irq(unsigned int irq)
static void target_ht_irq(unsigned int irq, unsigned int dest)
{
- u32 low, high;
- low = read_ht_irq_low(irq);
- high = read_ht_irq_high(irq);
+ struct ht_irq_msg msg;
+ fetch_ht_irq_msg(irq, &msg);
- low &= ~(HT_IRQ_LOW_DEST_ID_MASK);
- high &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
+ msg.address_lo &= ~(HT_IRQ_LOW_DEST_ID_MASK);
+ msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
- low |= HT_IRQ_LOW_DEST_ID(dest);
- high |= HT_IRQ_HIGH_DEST_ID(dest);
+ msg.address_lo |= HT_IRQ_LOW_DEST_ID(dest);
+ msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
- write_ht_irq_low(irq, low);
- write_ht_irq_high(irq, high);
+ write_ht_irq_msg(irq, &msg);
}
static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
@@ -2673,7 +2671,7 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
vector = assign_irq_vector(irq);
if (vector >= 0) {
- u32 low, high;
+ struct ht_irq_msg msg;
unsigned dest;
cpumask_t tmp;
@@ -2681,9 +2679,10 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
cpu_set(vector >> 8, tmp);
dest = cpu_mask_to_apicid(tmp);
- high = HT_IRQ_HIGH_DEST_ID(dest);
+ msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
- low = HT_IRQ_LOW_BASE |
+ msg.address_lo =
+ HT_IRQ_LOW_BASE |
HT_IRQ_LOW_DEST_ID(dest) |
HT_IRQ_LOW_VECTOR(vector) |
((INT_DEST_MODE == 0) ?
@@ -2695,8 +2694,7 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
HT_IRQ_LOW_MT_ARBITRATED) |
HT_IRQ_LOW_IRQ_MASKED;
- write_ht_irq_low(irq, low);
- write_ht_irq_high(irq, high);
+ write_ht_irq_msg(irq, &msg);
set_irq_chip_and_handler_name(irq, &ht_irq_chip,
handle_edge_irq, "edge");
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