arch: We can use an independent SIG interrupt to handle async pause,

       which can save processing time.

Signed-off-by: hujun5 <hujun5@xiaomi.com>

arch/arm/src/armv7-a/arm_cpupause.c

@@ -208,6 +208,34 @@ int up_cpu_paused_restore(void)
   return OK;
 }
 
+/****************************************************************************
+ * Name: arm_pause_async_handler
+ *
+ * Description:
+ *   This is the handler for async pause.
+ *
+ *   1. It saves the current task state at the head of the current assigned
+ *      task list.
+ *   2. It porcess g_delivertasks
+ *   3. Returns from interrupt, restoring the state of the new task at the
+ *      head of the ready to run list.
+ *
+ * Input Parameters:
+ *   Standard interrupt handling
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int arm_pause_async_handler(int irq, void *context, void *arg)
+{
+  int cpu = this_cpu();
+
+  nxsched_process_delivered(cpu);
+  return OK;
+}
+
 /****************************************************************************
  * Name: arm_pause_handler
  *
@@ -256,8 +284,6 @@ int arm_pause_handler(int irq, void *context, void *arg)
       leave_critical_section(flags);
     }
 
-  nxsched_process_delivered(cpu);
-
   return OK;
 }
 
@@ -282,7 +308,7 @@ int arm_pause_handler(int irq, void *context, void *arg)
 
 inline_function int up_cpu_pause_async(int cpu)
 {
-  arm_cpu_sgi(GIC_SMP_CPUPAUSE, (1 << cpu));
+  arm_cpu_sgi(GIC_SMP_CPUPAUSE_ASYNC, (1 << cpu));
 
   return OK;
 }
@@ -331,7 +357,7 @@ int up_cpu_pause(int cpu)
   spin_lock(&g_cpu_wait[cpu]);
   spin_lock(&g_cpu_paused[cpu]);
 
-  up_cpu_pause_async(cpu);
+  arm_cpu_sgi(GIC_SMP_CPUPAUSE, (1 << cpu));
 
   /* Wait for the other CPU to unlock g_cpu_paused meaning that
    * it is fully paused and ready for up_cpu_resume();

arch/arm/src/armv7-a/arm_gicv2.c

@@ -215,6 +215,8 @@ void arm_gic0_initialize(void)
 
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUSTART, arm_start_handler, NULL));
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE, arm_pause_handler, NULL));
+  DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE_ASYNC,
+                         arm_pause_async_handler, NULL));
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUCALL,
                          nxsched_smp_call_handler, NULL));
 #endif

arch/arm/src/armv7-a/gic.h

@@ -619,10 +619,12 @@
 #  define GIC_SMP_CPUSTART       GIC_IRQ_SGI9
 #  define GIC_SMP_CPUPAUSE       GIC_IRQ_SGI10
 #  define GIC_SMP_CPUCALL        GIC_IRQ_SGI11
+#  define GIC_SMP_CPUPAUSE_ASYNC GIC_IRQ_SGI12
 #else
 #  define GIC_SMP_CPUSTART       GIC_IRQ_SGI1
 #  define GIC_SMP_CPUPAUSE       GIC_IRQ_SGI2
 #  define GIC_SMP_CPUCALL        GIC_IRQ_SGI3
+#  define GIC_SMP_CPUPAUSE_ASYNC GIC_IRQ_SGI4
 #endif
 
 /****************************************************************************
@@ -839,6 +841,29 @@ int arm_start_handler(int irq, void *context, void *arg);
 int arm_pause_handler(int irq, void *context, void *arg);
 #endif
 
+/****************************************************************************
+ * Name: arm_pause_async_handler
+ *
+ * Description:
+ *   This is the handler for async pause.
+ *
+ *   1. It saves the current task state at the head of the current assigned
+ *      task list.
+ *   2. It porcess g_delivertasks
+ *   3. Returns from interrupt, restoring the state of the new task at the
+ *      head of the ready to run list.
+ *
+ * Input Parameters:
+ *   Standard interrupt handling
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SMP
+int arm_pause_async_handler(int irq, void *context, void *arg);
+#endif
 /****************************************************************************
  * Name: arm_gic_dump
  *

arch/arm/src/armv7-r/arm_cpupause.c

@@ -230,8 +230,6 @@ int up_cpu_paused_restore(void)
 
 int arm_pause_handler(int irq, void *context, void *arg)
 {
-  int cpu = this_cpu();
-
   /* Check for false alarms.  Such false could occur as a consequence of
    * some deadlock breaking logic that might have already serviced the SG2
    * interrupt by calling up_cpu_paused().  If the pause event has already
@@ -256,8 +254,34 @@ int arm_pause_handler(int irq, void *context, void *arg)
       leave_critical_section(flags);
     }
 
-  nxsched_process_delivered(cpu);
+  return OK;
+}
+
+/****************************************************************************
+ * Name: arm_pause_async_handler
+ *
+ * Description:
+ *   This is the handler for async pause.
+ *
+ *   1. It saves the current task state at the head of the current assigned
+ *      task list.
+ *   2. It porcess g_delivertasks
+ *   3. Returns from interrupt, restoring the state of the new task at the
+ *      head of the ready to run list.
+ *
+ * Input Parameters:
+ *   Standard interrupt handling
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int arm_pause_async_handler(int irq, void *context, void *arg)
+{
+  int cpu = this_cpu();
 
+  nxsched_process_delivered(cpu);
   return OK;
 }
 
@@ -282,7 +306,7 @@ int arm_pause_handler(int irq, void *context, void *arg)
 
 inline_function int up_cpu_pause_async(int cpu)
 {
-  arm_cpu_sgi(GIC_SMP_CPUPAUSE, (1 << cpu));
+  arm_cpu_sgi(GIC_SMP_CPUPAUSE_ASYNC, (1 << cpu));
 
   return OK;
 }
@@ -331,7 +355,7 @@ int up_cpu_pause(int cpu)
   spin_lock(&g_cpu_wait[cpu]);
   spin_lock(&g_cpu_paused[cpu]);
 
-  up_cpu_pause_async(cpu);
+  arm_cpu_sgi(GIC_SMP_CPUPAUSE, (1 << cpu));
 
   /* Wait for the other CPU to unlock g_cpu_paused meaning that
    * it is fully paused and ready for up_cpu_resume();

arch/arm/src/armv7-r/arm_gicv2.c

@@ -161,6 +161,8 @@ void arm_gic0_initialize(void)
 
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUSTART, arm_start_handler, NULL));
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE, arm_pause_handler, NULL));
+  DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE_ASYNC,
+                         arm_pause_async_handler, NULL));
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUCALL,
                          nxsched_smp_call_handler, NULL));
 #endif

arch/arm/src/armv7-r/gic.h

@@ -610,10 +610,12 @@
 #  define GIC_SMP_CPUSTART       GIC_IRQ_SGI9
 #  define GIC_SMP_CPUPAUSE       GIC_IRQ_SGI10
 #  define GIC_SMP_CPUCALL        GIC_IRQ_SGI11
+#  define GIC_SMP_CPUPAUSE_ASYNC GIC_IRQ_SGI12
 #else
 #  define GIC_SMP_CPUSTART       GIC_IRQ_SGI1
 #  define GIC_SMP_CPUPAUSE       GIC_IRQ_SGI2
 #  define GIC_SMP_CPUCALL        GIC_IRQ_SGI3
+#  define GIC_SMP_CPUPAUSE_ASYNC GIC_IRQ_SGI4
 #endif
 
 /****************************************************************************
@@ -827,6 +829,30 @@ int arm_start_handler(int irq, void *context, void *arg);
 int arm_pause_handler(int irq, void *context, void *arg);
 #endif
 
+/****************************************************************************
+ * Name: arm_pause_async_handler
+ *
+ * Description:
+ *   This is the handler for async pause.
+ *
+ *   1. It saves the current task state at the head of the current assigned
+ *      task list.
+ *   2. It porcess g_delivertasks
+ *   3. Returns from interrupt, restoring the state of the new task at the
+ *      head of the ready to run list.
+ *
+ * Input Parameters:
+ *   Standard interrupt handling
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SMP
+int arm_pause_async_handler(int irq, void *context, void *arg);
+#endif
+
 /****************************************************************************
  * Name: arm_gic_dump
  *

arch/arm/src/armv8-r/arm_gic.h

@@ -313,10 +313,12 @@
 #  define GIC_SMP_CPUSTART          GIC_IRQ_SGI9
 #  define GIC_SMP_CPUPAUSE          GIC_IRQ_SGI10
 #  define GIC_SMP_CPUCALL           GIC_IRQ_SGI11
+#  define GIC_SMP_CPUPAUSE_ASYNC    GIC_IRQ_SGI12
 #else
 #  define GIC_SMP_CPUSTART          GIC_IRQ_SGI1
 #  define GIC_SMP_CPUPAUSE          GIC_IRQ_SGI2
 #  define GIC_SMP_CPUCALL           GIC_IRQ_SGI3
+#  define GIC_SMP_CPUPAUSE_ASYNC    GIC_IRQ_SGI4
 #endif
 
 /****************************************************************************
@@ -355,6 +357,10 @@ int arm_gic_raise_sgi(unsigned int sgi_id, uint16_t target_list);
 
 int arm_pause_handler(int irq, void *context, void *arg);
 
+#ifdef CONFIG_SMP
+int arm_pause_async_handler(int irq, void *context, void *arg);
+#endif
+
 void arm_gic_secondary_init(void);
 
 #endif

arch/arm/src/armv8-r/arm_gicv3.c

@@ -568,6 +568,8 @@ static void gicv3_dist_init(void)
   /* Attach SGI interrupt handlers. This attaches the handler to all CPUs. */
 
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE, arm64_pause_handler, NULL));
+  DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE_ASYNC,
+                         arm64_pause_async_handler, NULL));
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUCALL,
                          nxsched_smp_call_handler, NULL));
 #endif
@@ -814,6 +816,7 @@ static void arm_gic_init(void)
 
 #ifdef CONFIG_SMP
   up_enable_irq(GIC_SMP_CPUPAUSE);
+  up_enable_irq(GIC_SMP_CPUPAUSE_ASYNC);
 #endif
 }
 

arch/arm64/src/common/arm64_cpupause.c

@@ -211,6 +211,35 @@ int up_cpu_paused_restore(void)
   return OK;
 }
 
+/****************************************************************************
+ * Name: arm64_pause_async_handler
+ *
+ * Description:
+ *   This is the handler for async pause.
+ *
+ *   1. It saves the current task state at the head of the current assigned
+ *      task list.
+ *   2. It porcess g_delivertasks
+ *   3. Returns from interrupt, restoring the state of the new task at the
+ *      head of the ready to run list.
+ *
+ * Input Parameters:
+ *   Standard interrupt handling
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int arm64_pause_async_handler(int irq, void *context, void *arg)
+{
+  int cpu = this_cpu();
+
+  nxsched_process_delivered(cpu);
+
+  return OK;
+}
+
 /****************************************************************************
  * Name: arm64_pause_handler
  *
@@ -259,8 +288,6 @@ int arm64_pause_handler(int irq, void *context, void *arg)
       leave_critical_section(flags);
     }
 
-  nxsched_process_delivered(cpu);
-
   return OK;
 }
 
@@ -287,7 +314,7 @@ inline_function int up_cpu_pause_async(int cpu)
 {
   /* Execute SGI2 */
 
-  arm64_gic_raise_sgi(GIC_SMP_CPUPAUSE, (1 << cpu));
+  arm64_gic_raise_sgi(GIC_SMP_CPUPAUSE_ASYNC, (1 << cpu));
 
   return OK;
 }
@@ -336,7 +363,7 @@ int up_cpu_pause(int cpu)
   spin_lock(&g_cpu_wait[cpu]);
   spin_lock(&g_cpu_paused[cpu]);
 
-  up_cpu_pause_async(cpu);
+  arm64_gic_raise_sgi(GIC_SMP_CPUPAUSE, (1 << cpu));
 
   /* Wait for the other CPU to unlock g_cpu_paused meaning that
    * it is fully paused and ready for up_cpu_resume();

arch/arm64/src/common/arm64_gic.h

@@ -281,10 +281,12 @@
 #define GIC_IRQ_SGI15               15
 
 #ifdef CONFIG_ARCH_TRUSTZONE_SECURE
+#  define GIC_SMP_CPUPAUSE_ASYNC    GIC_IRQ_SGI8
 #  define GIC_SMP_CPUSTART          GIC_IRQ_SGI9
 #  define GIC_SMP_CPUPAUSE          GIC_IRQ_SGI10
 #  define GIC_SMP_CPUCALL           GIC_IRQ_SGI11
 #else
+#  define GIC_SMP_CPUPAUSE_ASYNC    GIC_IRQ_SGI0
 #  define GIC_SMP_CPUSTART          GIC_IRQ_SGI1
 #  define GIC_SMP_CPUPAUSE          GIC_IRQ_SGI2
 #  define GIC_SMP_CPUCALL           GIC_IRQ_SGI3
@@ -343,6 +345,28 @@ void arm64_gic_raise_sgi(unsigned int sgi_id, uint16_t target_list);
 
 int arm64_pause_handler(int irq, void *context, void *arg);
 
+/****************************************************************************
+ * Name: arm64_pause_async_handler
+ *
+ * Description:
+ *   This is the handler for async pause.
+ *
+ *   1. It saves the current task state at the head of the current assigned
+ *      task list.
+ *   2. It porcess g_delivertasks
+ *   3. Returns from interrupt, restoring the state of the new task at the
+ *      head of the ready to run list.
+ *
+ * Input Parameters:
+ *   Standard interrupt handling
+ *
+ * Returned Value:
+ *   Zero on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int arm64_pause_async_handler(int irq, void *context, void *arg);
+
 void arm64_gic_secondary_init(void);
 
 #endif

arch/arm64/src/common/arm64_gicv2.c

@@ -911,6 +911,8 @@ static void arm_gic0_initialize(void)
   /* Attach SGI interrupt handlers. This attaches the handler to all CPUs. */
 
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE, arm64_pause_handler, NULL));
+  DEBUGVERIFY(irq_attach(GIC_SMP_CPUPAUSE_ASYNC,
+                         arm64_pause_async_handler, NULL));
   DEBUGVERIFY(irq_attach(GIC_SMP_CPUCALL,
                          nxsched_smp_call_handler, NULL));
 #endif