[PATCH v3 [resend] 13/18] smp, sparc: kill SMP single function call interrupt

Jiang Liu
2013-12-15T16:45:08Z

Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic
similar to smp_call_function_single()" has unified the way to handle
single and multiple cross-CPU function calls. Now only one interrupt
is needed for architecture specific code to support generic SMP function
call interfaces, so kill the redundant single function call interrupt.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Kosina <trivial@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
arch/sparc/include/asm/smp_32.h | 4 +---
arch/sparc/kernel/entry.S | 10 ++--------
arch/sparc/kernel/leon_smp.c | 31 +++++++------------------------
arch/sparc/kernel/smp_32.c | 14 ++------------
arch/sparc/kernel/sun4d_smp.c | 31 +++++++------------------------
arch/sparc/kernel/sun4m_smp.c | 11 ++---------
6 files changed, 21 insertions(+), 80 deletions(-)

diff --git a/arch/sparc/include/asm/smp_32.h b/arch/sparc/include/asm/smp_32.h
index 3c8917f..6aec01a 100644
--- a/arch/sparc/include/asm/smp_32.h
+++ b/arch/sparc/include/asm/smp_32.h
@@ -48,7 +48,6 @@ void smp_callin(void);
void smp_store_cpu_info(int);

void smp_resched_interrupt(void);
-void smp_call_function_single_interrupt(void);
void smp_call_function_interrupt(void);

struct seq_file;
@@ -60,8 +59,7 @@ struct sparc32_ipi_ops {
unsigned long arg2, unsigned long arg3,
unsigned long arg4);
void (*resched)(int cpu);
- void (*single)(int cpu);
- void (*mask_one)(int cpu);
+ void (*func_call)(int cpu);
};
extern const struct sparc32_ipi_ops *sparc32_ipi_ops;

diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index 33c02b1..98bacfb 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -263,7 +263,7 @@ smp4m_ticker:
* on some level other than 15 which is the NMI and only used
* for cross calls. That has a separate entry point below.
*
- * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
+ * IPIs are sent on Level 13 and 14. See IRQ_IPI_*.
*/
maybe_smp4m_msg:
GET_PROCESSOR4M_ID(o3)
@@ -287,14 +287,8 @@ maybe_smp4m_msg:
wr %l4, PSR_ET, %psr
WRITE_PAUSE
srl %o3, 28, %o2 ! shift for simpler checks below
-maybe_smp4m_msg_check_single:
- andcc %o2, 0x1, %g0
- beq,a maybe_smp4m_msg_check_mask
- andcc %o2, 0x2, %g0
- call smp_call_function_single_interrupt
- nop
- andcc %o2, 0x2, %g0
maybe_smp4m_msg_check_mask:
+ andcc %o2, 0x2, %g0
beq,a maybe_smp4m_msg_check_resched
andcc %o2, 0x4, %g0
call smp_call_function_interrupt
diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c
index 6edf955..396b71d 100644
--- a/arch/sparc/kernel/leon_smp.c
+++ b/arch/sparc/kernel/leon_smp.c
@@ -271,8 +271,7 @@ void leon_irq_rotate(int cpu)
}

struct leon_ipi_work {
- int single;
- int msk;
+ int func_call;
int resched;
};

@@ -308,7 +307,7 @@ static void __init leon_ipi_init(void)

for_each_possible_cpu(cpu) {
work = &per_cpu(leon_ipi_work, cpu);
- work->single = work->msk = work->resched = 0;
+ work->func_call = work->resched = 0;
}
}

@@ -319,23 +318,12 @@ static void leon_send_ipi(int cpu, int level)
LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
}

-static void leon_ipi_single(int cpu)
+static void leon_ipi_func_call(int cpu)
{
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);

/* Mark work */
- work->single = 1;
-
- /* Generate IRQ on the CPU */
- leon_send_ipi(cpu, leon_ipi_irq);
-}
-
-static void leon_ipi_mask_one(int cpu)
-{
- struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
-
- /* Mark work */
- work->msk = 1;
+ work->func_call = 1;

/* Generate IRQ on the CPU */
leon_send_ipi(cpu, leon_ipi_irq);
@@ -356,12 +344,8 @@ void leonsmp_ipi_interrupt(void)
{
struct leon_ipi_work *work = &__get_cpu_var(leon_ipi_work);

- if (work->single) {
- work->single = 0;
- smp_call_function_single_interrupt();
- }
- if (work->msk) {
- work->msk = 0;
+ if (work->func_call) {
+ work->func_call = 0;
smp_call_function_interrupt();
}
if (work->resched) {
@@ -467,8 +451,7 @@ void leon_cross_call_irq(void)
static const struct sparc32_ipi_ops leon_ipi_ops = {
.cross_call = leon_cross_call,
.resched = leon_ipi_resched,
- .single = leon_ipi_single,
- .mask_one = leon_ipi_mask_one,
+ .func_call = leon_ipi_func_call,
};

void __init leon_init_smp(void)
diff --git a/arch/sparc/kernel/smp_32.c b/arch/sparc/kernel/smp_32.c
index a102bfb..0530d67 100644
--- a/arch/sparc/kernel/smp_32.c
+++ b/arch/sparc/kernel/smp_32.c
@@ -138,17 +138,15 @@ void smp_send_stop(void)

void arch_send_call_function_single_ipi(int cpu)
{
- /* trigger one IPI single call on one CPU */
- sparc32_ipi_ops->single(cpu);
+ sparc32_ipi_ops->func_call(cpu);
}

void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
int cpu;

- /* trigger IPI mask call on each CPU */
for_each_cpu(cpu, mask)
- sparc32_ipi_ops->mask_one(cpu);
+ sparc32_ipi_ops->func_call(cpu);
}

void smp_resched_interrupt(void)
@@ -160,14 +158,6 @@ void smp_resched_interrupt(void)
/* re-schedule routine called by interrupt return code. */
}

-void smp_call_function_single_interrupt(void)
-{
- irq_enter();
- generic_smp_call_function_single_interrupt();
- local_cpu_data().irq_call_count++;
- irq_exit();
-}
-
void smp_call_function_interrupt(void)
{
irq_enter();
diff --git a/arch/sparc/kernel/sun4d_smp.c b/arch/sparc/kernel/sun4d_smp.c
index d5c3195..72f3797 100644
--- a/arch/sparc/kernel/sun4d_smp.c
+++ b/arch/sparc/kernel/sun4d_smp.c
@@ -181,8 +181,7 @@ void __init smp4d_smp_done(void)

/* Memory structure giving interrupt handler information about IPI generated */
struct sun4d_ipi_work {
- int single;
- int msk;
+ int func_call;
int resched;
};

@@ -198,7 +197,7 @@ static void __init smp4d_ipi_init(void)

for_each_possible_cpu(cpu) {
work = &per_cpu(sun4d_ipi_work, cpu);
- work->single = work->msk = work->resched = 0;
+ work->func_call = work->resched = 0;
}
}

@@ -206,12 +205,8 @@ void sun4d_ipi_interrupt(void)
{
struct sun4d_ipi_work *work = &__get_cpu_var(sun4d_ipi_work);

- if (work->single) {
- work->single = 0;
- smp_call_function_single_interrupt();
- }
- if (work->msk) {
- work->msk = 0;
+ if (work->func_call) {
+ work->func_call = 0;
smp_call_function_interrupt();
}
if (work->resched) {
@@ -233,23 +228,12 @@ static void sun4d_send_ipi(int cpu, int level)
cc_set_igen(IGEN_MESSAGE(0, cpu << 3, 6 + ((level >> 1) & 7), 1 << (level - 1)));
}

-static void sun4d_ipi_single(int cpu)
-{
- struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu);
-
- /* Mark work */
- work->single = 1;
-
- /* Generate IRQ on the CPU */
- sun4d_send_ipi(cpu, SUN4D_IPI_IRQ);
-}
-
-static void sun4d_ipi_mask_one(int cpu)
+static void sun4d_ipi_func_call(int cpu)
{
struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu);

/* Mark work */
- work->msk = 1;
+ work->func_call = 1;

/* Generate IRQ on the CPU */
sun4d_send_ipi(cpu, SUN4D_IPI_IRQ);
@@ -392,8 +376,7 @@ void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
static const struct sparc32_ipi_ops sun4d_ipi_ops = {
.cross_call = sun4d_cross_call,
.resched = sun4d_ipi_resched,
- .single = sun4d_ipi_single,
- .mask_one = sun4d_ipi_mask_one,
+ .func_call = sun4d_ipi_func_call,
};

void __init sun4d_init_smp(void)
diff --git a/arch/sparc/kernel/sun4m_smp.c b/arch/sparc/kernel/sun4m_smp.c
index d3408e7..d4b7d01 100644
--- a/arch/sparc/kernel/sun4m_smp.c
+++ b/arch/sparc/kernel/sun4m_smp.c
@@ -20,7 +20,6 @@
#include "irq.h"
#include "kernel.h"

-#define IRQ_IPI_SINGLE 12
#define IRQ_IPI_MASK 13
#define IRQ_IPI_RESCHED 14
#define IRQ_CROSS_CALL 15
@@ -145,12 +144,7 @@ static void sun4m_ipi_resched(int cpu)
sun4m_send_ipi(cpu, IRQ_IPI_RESCHED);
}

-static void sun4m_ipi_single(int cpu)
-{
- sun4m_send_ipi(cpu, IRQ_IPI_SINGLE);
-}
-
-static void sun4m_ipi_mask_one(int cpu)
+static void sun4m_ipi_func_call(int cpu)
{
sun4m_send_ipi(cpu, IRQ_IPI_MASK);
}
@@ -262,8 +256,7 @@ void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
static const struct sparc32_ipi_ops sun4m_ipi_ops = {
.cross_call = sun4m_cross_call,
.resched = sun4m_ipi_resched,
- .single = sun4m_ipi_single,
- .mask_one = sun4m_ipi_mask_one,
+ .func_call = sun4m_ipi_func_call,
};

void __init sun4m_init_smp(void)
--
1.8.1.2