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[PATCH] htirq: refactor so we only have one function that writes to t…
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…he 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>
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Eric W. Biederman authored and Linus Torvalds committed Nov 9, 2006
1 parent 64d9fe6 commit ec68307
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Showing 4 changed files with 58 additions and 82 deletions.
26 changes: 12 additions & 14 deletions arch/i386/kernel/io_apic.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -2673,17 +2671,18 @@ 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;

cpus_clear(tmp);
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) ?
Expand All @@ -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");
Expand Down
31 changes: 15 additions & 16 deletions arch/x86_64/kernel/io_apic.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand All @@ -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
Expand All @@ -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) ?
Expand All @@ -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");
Expand Down
72 changes: 24 additions & 48 deletions drivers/pci/htirq.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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)
{
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);
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_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)
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;
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);
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);
return data;
cfg->msg = *msg;
}

u32 read_ht_irq_high(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 + 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);
}

/**
Expand Down Expand Up @@ -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) {
Expand Down
11 changes: 7 additions & 4 deletions include/linux/htirq.h
View file
Original file line number Diff line number Diff line change
@@ -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);

Expand Down

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