[Qemu-devel] [PULL 16/28] cpus-common: move CPU work item management to common code

[Paolo Bonzini <pbonzini@redhat.com>]

From: Sergey Fedorov <serge.fdrv@gmail.com>

Make CPU work core functions common between system and user-mode
emulation. User-mode does not use run_on_cpu, so do not implement it.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <1470158864-17651-10-git-send-email-alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 bsd-user/main.c   | 11 +++++--
 cpus-common.c     | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 cpus.c            | 82 +-----------------------------------------------
 include/qom/cpu.h | 27 +++++++++++-----
 linux-user/main.c | 25 +++++++++++++++
 5 files changed, 148 insertions(+), 91 deletions(-)

diff --git a/bsd-user/main.c b/bsd-user/main.c
index 591c424..6dfa912 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -68,11 +68,11 @@ int cpu_get_pic_interrupt(CPUX86State *env)
 #endif
 
 /* These are no-ops because we are not threadsafe.  */
-static inline void cpu_exec_start(CPUArchState *env)
+static inline void cpu_exec_start(CPUState *cpu)
 {
 }
 
-static inline void cpu_exec_end(CPUArchState *env)
+static inline void cpu_exec_end(CPUState *cpu)
 {
 }
 
@@ -164,7 +164,11 @@ void cpu_loop(CPUX86State *env)
     //target_siginfo_t info;
 
     for(;;) {
+        cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
+        cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch(trapnr) {
         case 0x80:
             /* syscall from int $0x80 */
@@ -505,7 +509,10 @@ void cpu_loop(CPUSPARCState *env)
     //target_siginfo_t info;
 
     while (1) {
+        cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
+        cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
 
         switch (trapnr) {
 #ifndef TARGET_SPARC64
diff --git a/cpus-common.c b/cpus-common.c
index fda3848..2005bfe 100644
--- a/cpus-common.c
+++ b/cpus-common.c
@@ -23,10 +23,12 @@
 #include "sysemu/cpus.h"
 
 static QemuMutex qemu_cpu_list_lock;
+static QemuCond qemu_work_cond;
 
 void qemu_init_cpu_list(void)
 {
     qemu_mutex_init(&qemu_cpu_list_lock);
+    qemu_cond_init(&qemu_work_cond);
 }
 
 void cpu_list_lock(void)
@@ -81,3 +83,95 @@ void cpu_list_remove(CPUState *cpu)
     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
     qemu_mutex_unlock(&qemu_cpu_list_lock);
 }
+
+struct qemu_work_item {
+    struct qemu_work_item *next;
+    run_on_cpu_func func;
+    void *data;
+    int done;
+    bool free;
+};
+
+static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi)
+{
+    qemu_mutex_lock(&cpu->work_mutex);
+    if (cpu->queued_work_first == NULL) {
+        cpu->queued_work_first = wi;
+    } else {
+        cpu->queued_work_last->next = wi;
+    }
+    cpu->queued_work_last = wi;
+    wi->next = NULL;
+    wi->done = false;
+    qemu_mutex_unlock(&cpu->work_mutex);
+
+    qemu_cpu_kick(cpu);
+}
+
+void do_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data,
+                   QemuMutex *mutex)
+{
+    struct qemu_work_item wi;
+
+    if (qemu_cpu_is_self(cpu)) {
+        func(cpu, data);
+        return;
+    }
+
+    wi.func = func;
+    wi.data = data;
+    wi.free = false;
+
+    queue_work_on_cpu(cpu, &wi);
+    while (!atomic_mb_read(&wi.done)) {
+        CPUState *self_cpu = current_cpu;
+
+        qemu_cond_wait(&qemu_work_cond, mutex);
+        current_cpu = self_cpu;
+    }
+}
+
+void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data)
+{
+    struct qemu_work_item *wi;
+
+    if (qemu_cpu_is_self(cpu)) {
+        func(cpu, data);
+        return;
+    }
+
+    wi = g_malloc0(sizeof(struct qemu_work_item));
+    wi->func = func;
+    wi->data = data;
+    wi->free = true;
+
+    queue_work_on_cpu(cpu, wi);
+}
+
+void process_queued_cpu_work(CPUState *cpu)
+{
+    struct qemu_work_item *wi;
+
+    if (cpu->queued_work_first == NULL) {
+        return;
+    }
+
+    qemu_mutex_lock(&cpu->work_mutex);
+    while (cpu->queued_work_first != NULL) {
+        wi = cpu->queued_work_first;
+        cpu->queued_work_first = wi->next;
+        if (!cpu->queued_work_first) {
+            cpu->queued_work_last = NULL;
+        }
+        qemu_mutex_unlock(&cpu->work_mutex);
+        wi->func(cpu, wi->data);
+        qemu_mutex_lock(&cpu->work_mutex);
+        if (wi->free) {
+            g_free(wi);
+        } else {
+            atomic_mb_set(&wi->done, true);
+        }
+    }
+    qemu_mutex_unlock(&cpu->work_mutex);
+    qemu_cond_broadcast(&qemu_work_cond);
+}
diff --git a/cpus.c b/cpus.c
index 28d6206..c3afd18 100644
--- a/cpus.c
+++ b/cpus.c
@@ -902,73 +902,21 @@ static QemuThread io_thread;
 static QemuCond qemu_cpu_cond;
 /* system init */
 static QemuCond qemu_pause_cond;
-static QemuCond qemu_work_cond;
 
 void qemu_init_cpu_loop(void)
 {
     qemu_init_sigbus();
     qemu_cond_init(&qemu_cpu_cond);
     qemu_cond_init(&qemu_pause_cond);
-    qemu_cond_init(&qemu_work_cond);
     qemu_cond_init(&qemu_io_proceeded_cond);
     qemu_mutex_init(&qemu_global_mutex);
 
     qemu_thread_get_self(&io_thread);
 }
 
-static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi)
-{
-    qemu_mutex_lock(&cpu->work_mutex);
-    if (cpu->queued_work_first == NULL) {
-        cpu->queued_work_first = wi;
-    } else {
-        cpu->queued_work_last->next = wi;
-    }
-    cpu->queued_work_last = wi;
-    wi->next = NULL;
-    wi->done = false;
-    qemu_mutex_unlock(&cpu->work_mutex);
-
-    qemu_cpu_kick(cpu);
-}
-
 void run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data)
 {
-    struct qemu_work_item wi;
-
-    if (qemu_cpu_is_self(cpu)) {
-        func(cpu, data);
-        return;
-    }
-
-    wi.func = func;
-    wi.data = data;
-    wi.free = false;
-
-    queue_work_on_cpu(cpu, &wi);
-    while (!atomic_mb_read(&wi.done)) {
-        CPUState *self_cpu = current_cpu;
-
-        qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
-        current_cpu = self_cpu;
-    }
-}
-
-void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data)
-{
-    struct qemu_work_item *wi;
-
-    if (qemu_cpu_is_self(cpu)) {
-        func(cpu, data);
-        return;
-    }
-
-    wi = g_malloc0(sizeof(struct qemu_work_item));
-    wi->func = func;
-    wi->data = data;
-    wi->free = true;
-
-    queue_work_on_cpu(cpu, wi);
+    do_run_on_cpu(cpu, func, data, &qemu_global_mutex);
 }
 
 static void qemu_kvm_destroy_vcpu(CPUState *cpu)
@@ -983,34 +931,6 @@ static void qemu_tcg_destroy_vcpu(CPUState *cpu)
 {
 }
 
-static void process_queued_cpu_work(CPUState *cpu)
-{
-    struct qemu_work_item *wi;
-
-    if (cpu->queued_work_first == NULL) {
-        return;
-    }
-
-    qemu_mutex_lock(&cpu->work_mutex);
-    while (cpu->queued_work_first != NULL) {
-        wi = cpu->queued_work_first;
-        cpu->queued_work_first = wi->next;
-        if (!cpu->queued_work_first) {
-            cpu->queued_work_last = NULL;
-        }
-        qemu_mutex_unlock(&cpu->work_mutex);
-        wi->func(cpu, wi->data);
-        qemu_mutex_lock(&cpu->work_mutex);
-        if (wi->free) {
-            g_free(wi);
-        } else {
-            atomic_mb_set(&wi->done, true);
-        }
-    }
-    qemu_mutex_unlock(&cpu->work_mutex);
-    qemu_cond_broadcast(&qemu_work_cond);
-}
-
 static void qemu_wait_io_event_common(CPUState *cpu)
 {
     if (cpu->stop) {
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index ea3233f..c04e510 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -233,14 +233,7 @@ struct kvm_run;
 
 /* work queue */
 typedef void (*run_on_cpu_func)(CPUState *cpu, void *data);
-
-struct qemu_work_item {
-    struct qemu_work_item *next;
-    run_on_cpu_func func;
-    void *data;
-    int done;
-    bool free;
-};
+struct qemu_work_item;
 
 /**
  * CPUState:
@@ -630,6 +623,18 @@ void qemu_cpu_kick(CPUState *cpu);
 bool cpu_is_stopped(CPUState *cpu);
 
 /**
+ * do_run_on_cpu:
+ * @cpu: The vCPU to run on.
+ * @func: The function to be executed.
+ * @data: Data to pass to the function.
+ * @mutex: Mutex to release while waiting for @func to run.
+ *
+ * Used internally in the implementation of run_on_cpu.
+ */
+void do_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data,
+                   QemuMutex *mutex);
+
+/**
  * run_on_cpu:
  * @cpu: The vCPU to run on.
  * @func: The function to be executed.
@@ -808,6 +813,12 @@ void cpu_remove(CPUState *cpu);
 void cpu_remove_sync(CPUState *cpu);
 
 /**
+ * process_queued_cpu_work() - process all items on CPU work queue
+ * @cpu: The CPU which work queue to process.
+ */
+void process_queued_cpu_work(CPUState *cpu);
+
+/**
  * qemu_init_vcpu:
  * @cpu: The vCPU to initialize.
  *
diff --git a/linux-user/main.c b/linux-user/main.c
index 719f046..e3eca40 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -294,6 +294,8 @@ void cpu_loop(CPUX86State *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch(trapnr) {
         case 0x80:
             /* linux syscall from int $0x80 */
@@ -735,6 +737,8 @@ void cpu_loop(CPUARMState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch(trapnr) {
         case EXCP_UDEF:
             {
@@ -1071,6 +1075,7 @@ void cpu_loop(CPUARMState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
 
         switch (trapnr) {
         case EXCP_SWI:
@@ -1159,6 +1164,8 @@ void cpu_loop(CPUUniCore32State *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch (trapnr) {
         case UC32_EXCP_PRIV:
             {
@@ -1364,6 +1371,7 @@ void cpu_loop (CPUSPARCState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
 
         /* Compute PSR before exposing state.  */
         if (env->cc_op != CC_OP_FLAGS) {
@@ -1636,6 +1644,8 @@ void cpu_loop(CPUPPCState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch(trapnr) {
         case POWERPC_EXCP_NONE:
             /* Just go on */
@@ -2482,6 +2492,8 @@ void cpu_loop(CPUMIPSState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch(trapnr) {
         case EXCP_SYSCALL:
             env->active_tc.PC += 4;
@@ -2722,6 +2734,7 @@ void cpu_loop(CPUOpenRISCState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
         gdbsig = 0;
 
         switch (trapnr) {
@@ -2816,6 +2829,7 @@ void cpu_loop(CPUSH4State *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
 
         switch (trapnr) {
         case 0x160:
@@ -2882,6 +2896,8 @@ void cpu_loop(CPUCRISState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch (trapnr) {
         case 0xaa:
             {
@@ -2947,6 +2963,8 @@ void cpu_loop(CPUMBState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch (trapnr) {
         case 0xaa:
             {
@@ -3064,6 +3082,8 @@ void cpu_loop(CPUM68KState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch(trapnr) {
         case EXCP_ILLEGAL:
             {
@@ -3207,6 +3227,7 @@ void cpu_loop(CPUAlphaState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
 
         /* All of the traps imply a transition through PALcode, which
            implies an REI instruction has been executed.  Which means
@@ -3399,6 +3420,8 @@ void cpu_loop(CPUS390XState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch (trapnr) {
         case EXCP_INTERRUPT:
             /* Just indicate that signals should be handled asap.  */
@@ -3708,6 +3731,8 @@ void cpu_loop(CPUTLGState *env)
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
         switch (trapnr) {
         case TILEGX_EXCP_SYSCALL:
         {
-- 
2.7.4