[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>
diff --git a/drivers/pci/htirq.c b/drivers/pci/htirq.c
index 0e27f24..e346fe3 100644
--- a/drivers/pci/htirq.c
+++ b/drivers/pci/htirq.c
@@ -27,82 +27,55 @@
struct pci_dev *dev;
unsigned pos;
unsigned idx;
+ struct ht_irq_msg msg;
};
-void write_ht_irq_low(unsigned int irq, u32 data)
+
+void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
spin_lock_irqsave(&ht_irq_lock, flags);
- pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
- pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
+ if (cfg->msg.address_lo != msg->address_lo) {
+ pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
+ pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo);
+ }
+ if (cfg->msg.address_hi != msg->address_hi) {
+ pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
+ pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);
+ }
spin_unlock_irqrestore(&ht_irq_lock, flags);
+ cfg->msg = *msg;
}
-void write_ht_irq_high(unsigned int irq, u32 data)
+void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
- unsigned long flags;
- spin_lock_irqsave(&ht_irq_lock, flags);
- pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
- pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
- spin_unlock_irqrestore(&ht_irq_lock, flags);
-}
-
-u32 read_ht_irq_low(unsigned int irq)
-{
- struct ht_irq_cfg *cfg = get_irq_data(irq);
- unsigned long flags;
- u32 data;
- spin_lock_irqsave(&ht_irq_lock, flags);
- pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
- pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
- spin_unlock_irqrestore(&ht_irq_lock, flags);
- return data;
-}
-
-u32 read_ht_irq_high(unsigned int irq)
-{
- struct ht_irq_cfg *cfg = get_irq_data(irq);
- unsigned long flags;
- u32 data;
- spin_lock_irqsave(&ht_irq_lock, flags);
- pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
- pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
- spin_unlock_irqrestore(&ht_irq_lock, flags);
- return data;
+ *msg = cfg->msg;
}
void mask_ht_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
- unsigned long flags;
- u32 data;
+ struct ht_irq_msg msg;
cfg = get_irq_data(irq);
- spin_lock_irqsave(&ht_irq_lock, flags);
- pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
- pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
- data |= 1;
- pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
- spin_unlock_irqrestore(&ht_irq_lock, flags);
+ msg = cfg->msg;
+ msg.address_lo |= 1;
+ write_ht_irq_msg(irq, &msg);
}
void unmask_ht_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
- unsigned long flags;
- u32 data;
+ struct ht_irq_msg msg;
cfg = get_irq_data(irq);
- spin_lock_irqsave(&ht_irq_lock, flags);
- pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
- pci_read_config_dword(cfg->dev, cfg->pos + 4, &data);
- data &= ~1;
- pci_write_config_dword(cfg->dev, cfg->pos + 4, data);
- spin_unlock_irqrestore(&ht_irq_lock, flags);
+ msg = cfg->msg;
+ msg.address_lo &= ~1;
+ write_ht_irq_msg(irq, &msg);
}
/**
@@ -152,6 +125,9 @@
cfg->dev = dev;
cfg->pos = pos;
cfg->idx = 0x10 + (idx * 2);
+ /* Initialize msg to a value that will never match the first write. */
+ cfg->msg.address_lo = 0xffffffff;
+ cfg->msg.address_hi = 0xffffffff;
irq = create_irq();
if (irq < 0) {