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[PATCH] htirq: refactor so we only have one function that writes to the chip

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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>
This commit is contained in:
Eric W. Biederman
2006-11-08 17:44:57 -08:00
committed by Linus Torvalds
parent 64d9fe6973
commit ec68307cc5
4 changed files with 59 additions and 83 deletions
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26
arch/i386/kernel/io_apic.c
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@@ -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");