The patch titled
htirq: refactor so we only have one function that writes to the chip
has been removed from the -mm tree. Its filename was
htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: htirq: refactor so we only have one function that writes to the chip
From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Acked-by: Bryan O'Sullivan <bos@xxxxxxxxxxxxx>
Cc: <olson@xxxxxxxxxxxxx>
Cc: Roland Dreier <rolandd@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/io_apic.c | 26 +++++------
arch/x86_64/kernel/io_apic.c | 31 ++++++--------
drivers/pci/htirq.c | 72 +++++++++++----------------------
include/linux/htirq.h | 11 +++--
4 files changed, 58 insertions(+), 82 deletions(-)
diff -puN arch/i386/kernel/io_apic.c~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip arch/i386/kernel/io_apic.c
--- a/arch/i386/kernel/io_apic.c~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip
+++ a/arch/i386/kernel/io_apic.c
@@ -2624,18 +2624,16 @@ void arch_teardown_msi_irq(unsigned int
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,
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,
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,
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");
diff -puN arch/x86_64/kernel/io_apic.c~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip arch/x86_64/kernel/io_apic.c
--- a/arch/x86_64/kernel/io_apic.c~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip
+++ a/arch/x86_64/kernel/io_apic.c
@@ -1955,18 +1955,16 @@ void arch_teardown_msi_irq(unsigned int
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
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,
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,
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");
diff -puN drivers/pci/htirq.c~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip drivers/pci/htirq.c
--- a/drivers/pci/htirq.c~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip
+++ a/drivers/pci/htirq.c
@@ -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);
}
/**
@@ -152,6 +125,9 @@ int ht_create_irq(struct pci_dev *dev, i
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) {
diff -puN include/linux/htirq.h~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip include/linux/htirq.h
--- a/include/linux/htirq.h~htirq-refactor-so-we-only-have-one-function-that-writes-to-the-chip
+++ a/include/linux/htirq.h
@@ -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);
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxx are
origin.patch
add-process_session-helper-routine.patch
rename-struct-namespace-to-struct-mnt_namespace.patch
add-an-identifier-to-nsproxy.patch
rename-struct-pspace-to-struct-pid_namespace.patch
add-pid_namespace-to-nsproxy.patch
use-current-nsproxy-pid_ns.patch
add-child-reaper-to-pid_namespace.patch
rename-struct-namespace-to-struct-mnt_namespace-cachefiles.patch
clockevents-core-check-for-clock-event-device-handler-being-non-null-before-calling-it.patch
pidhash-temporary-debug-checks.patch
-
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