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[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>
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/i386/kernel/io_apic.c
View File

@ -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");

31
arch/x86_64/kernel/io_apic.c
View File

@ -1955,18 +1955,16 @@ void arch_teardown_msi_irq(unsigned int irq)
static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
{
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_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
high &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
low |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
high |= HT_IRQ_HIGH_DEST_ID(dest);
msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | 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)
@ -1987,7 +1985,7 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
dest = cpu_mask_to_apicid(tmp);
target_ht_irq(irq, dest, vector & 0xff);
target_ht_irq(irq, dest, vector);
set_native_irq_info(irq, mask);
}
#endif
@ -2010,14 +2008,15 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
vector = assign_irq_vector(irq, TARGET_CPUS, &tmp);
if (vector >= 0) {
u32 low, high;
struct ht_irq_msg msg;
unsigned dest;
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) ?
@ -2026,10 +2025,10 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
HT_IRQ_LOW_RQEOI_EDGE |
((INT_DELIVERY_MODE != dest_LowestPrio) ?
HT_IRQ_LOW_MT_FIXED :
HT_IRQ_LOW_MT_ARBITRATED);
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");

70
drivers/pci/htirq.c
View File

@ -27,82 +27,55 @@ struct ht_irq_cfg {
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);
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, data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
}
void write_ht_irq_high(unsigned int irq, u32 data)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
spin_lock_irqsave(&ht_irq_lock, flags);
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, data);
pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);
}
spin_unlock_irqrestore(&ht_irq_lock, flags);
cfg->msg = *msg;
}
u32 read_ht_irq_low(unsigned int irq)
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;
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 @@ int ht_create_irq(struct pci_dev *dev, int idx)
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) {

11
include/linux/htirq.h
View File

@ -1,11 +1,14 @@
#ifndef LINUX_HTIRQ_H
#define LINUX_HTIRQ_H
struct ht_irq_msg {
u32 address_lo; /* low 32 bits of the ht irq message */
u32 address_hi; /* high 32 bits of the it irq message */
};
/* Helper functions.. */
void write_ht_irq_low(unsigned int irq, u32 data);
void write_ht_irq_high(unsigned int irq, u32 data);
u32 read_ht_irq_low(unsigned int irq);
u32 read_ht_irq_high(unsigned int irq);
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
void mask_ht_irq(unsigned int irq);
void unmask_ht_irq(unsigned int irq);