exec: Rename cpu.c -> cpu-target.c

We have exec/cpu code split in 2 files for target agnostic
("common") and specific. Rename 'cpu.c' which is target
specific using the '-target' suffix. Update MAINTAINERS.
Remove the 's from 'cpus-common.c' to match the API cpu_foo()
functions.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20230914185718.76241-7-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 0 insertions, 442 deletions

diff --git a/cpus-common.c b/cpus-common.c
deleted file mode 100644
index 45c745ecf6..0000000000
--- a/cpus-common.c
+++ /dev/null
@@ -1,442 +0,0 @@
-/*
- * CPU thread main loop - common bits for user and system mode emulation
- *
- *  Copyright (c) 2003-2005 Fabrice Bellard
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "qemu/osdep.h"
-#include "qemu/main-loop.h"
-#include "exec/cpu-common.h"
-#include "hw/core/cpu.h"
-#include "sysemu/cpus.h"
-#include "qemu/lockable.h"
-#include "trace/trace-root.h"
-
-QemuMutex qemu_cpu_list_lock;
-static QemuCond exclusive_cond;
-static QemuCond exclusive_resume;
-static QemuCond qemu_work_cond;
-
-/* >= 1 if a thread is inside start_exclusive/end_exclusive.  Written
- * under qemu_cpu_list_lock, read with atomic operations.
- */
-static int pending_cpus;
-
-void qemu_init_cpu_list(void)
-{
-    /* This is needed because qemu_init_cpu_list is also called by the
-     * child process in a fork.  */
-    pending_cpus = 0;
-
-    qemu_mutex_init(&qemu_cpu_list_lock);
-    qemu_cond_init(&exclusive_cond);
-    qemu_cond_init(&exclusive_resume);
-    qemu_cond_init(&qemu_work_cond);
-}
-
-void cpu_list_lock(void)
-{
-    qemu_mutex_lock(&qemu_cpu_list_lock);
-}
-
-void cpu_list_unlock(void)
-{
-    qemu_mutex_unlock(&qemu_cpu_list_lock);
-}
-
-static bool cpu_index_auto_assigned;
-
-static int cpu_get_free_index(void)
-{
-    CPUState *some_cpu;
-    int max_cpu_index = 0;
-
-    cpu_index_auto_assigned = true;
-    CPU_FOREACH(some_cpu) {
-        if (some_cpu->cpu_index >= max_cpu_index) {
-            max_cpu_index = some_cpu->cpu_index + 1;
-        }
-    }
-    return max_cpu_index;
-}
-
-CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
-static unsigned int cpu_list_generation_id;
-
-unsigned int cpu_list_generation_id_get(void)
-{
-    return cpu_list_generation_id;
-}
-
-void cpu_list_add(CPUState *cpu)
-{
-    QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
-    if (cpu->cpu_index == UNASSIGNED_CPU_INDEX) {
-        cpu->cpu_index = cpu_get_free_index();
-        assert(cpu->cpu_index != UNASSIGNED_CPU_INDEX);
-    } else {
-        assert(!cpu_index_auto_assigned);
-    }
-    QTAILQ_INSERT_TAIL_RCU(&cpus, cpu, node);
-    cpu_list_generation_id++;
-}
-
-void cpu_list_remove(CPUState *cpu)
-{
-    QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
-    if (!QTAILQ_IN_USE(cpu, node)) {
-        /* there is nothing to undo since cpu_exec_init() hasn't been called */
-        return;
-    }
-
-    QTAILQ_REMOVE_RCU(&cpus, cpu, node);
-    cpu->cpu_index = UNASSIGNED_CPU_INDEX;
-    cpu_list_generation_id++;
-}
-
-CPUState *qemu_get_cpu(int index)
-{
-    CPUState *cpu;
-
-    CPU_FOREACH(cpu) {
-        if (cpu->cpu_index == index) {
-            return cpu;
-        }
-    }
-
-    return NULL;
-}
-
-/* current CPU in the current thread. It is only valid inside cpu_exec() */
-__thread CPUState *current_cpu;
-
-struct qemu_work_item {
-    QSIMPLEQ_ENTRY(qemu_work_item) node;
-    run_on_cpu_func func;
-    run_on_cpu_data data;
-    bool free, exclusive, done;
-};
-
-static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi)
-{
-    qemu_mutex_lock(&cpu->work_mutex);
-    QSIMPLEQ_INSERT_TAIL(&cpu->work_list, wi, node);
-    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, run_on_cpu_data 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.done = false;
-    wi.free = false;
-    wi.exclusive = false;
-
-    queue_work_on_cpu(cpu, &wi);
-    while (!qatomic_load_acquire(&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, run_on_cpu_data data)
-{
-    struct qemu_work_item *wi;
-
-    wi = g_new0(struct qemu_work_item, 1);
-    wi->func = func;
-    wi->data = data;
-    wi->free = true;
-
-    queue_work_on_cpu(cpu, wi);
-}
-
-/* Wait for pending exclusive operations to complete.  The CPU list lock
-   must be held.  */
-static inline void exclusive_idle(void)
-{
-    while (pending_cpus) {
-        qemu_cond_wait(&exclusive_resume, &qemu_cpu_list_lock);
-    }
-}
-
-/* Start an exclusive operation.
-   Must only be called from outside cpu_exec.  */
-void start_exclusive(void)
-{
-    CPUState *other_cpu;
-    int running_cpus;
-
-    if (current_cpu->exclusive_context_count) {
-        current_cpu->exclusive_context_count++;
-        return;
-    }
-
-    qemu_mutex_lock(&qemu_cpu_list_lock);
-    exclusive_idle();
-
-    /* Make all other cpus stop executing.  */
-    qatomic_set(&pending_cpus, 1);
-
-    /* Write pending_cpus before reading other_cpu->running.  */
-    smp_mb();
-    running_cpus = 0;
-    CPU_FOREACH(other_cpu) {
-        if (qatomic_read(&other_cpu->running)) {
-            other_cpu->has_waiter = true;
-            running_cpus++;
-            qemu_cpu_kick(other_cpu);
-        }
-    }
-
-    qatomic_set(&pending_cpus, running_cpus + 1);
-    while (pending_cpus > 1) {
-        qemu_cond_wait(&exclusive_cond, &qemu_cpu_list_lock);
-    }
-
-    /* Can release mutex, no one will enter another exclusive
-     * section until end_exclusive resets pending_cpus to 0.
-     */
-    qemu_mutex_unlock(&qemu_cpu_list_lock);
-
-    current_cpu->exclusive_context_count = 1;
-}
-
-/* Finish an exclusive operation.  */
-void end_exclusive(void)
-{
-    current_cpu->exclusive_context_count--;
-    if (current_cpu->exclusive_context_count) {
-        return;
-    }
-
-    qemu_mutex_lock(&qemu_cpu_list_lock);
-    qatomic_set(&pending_cpus, 0);
-    qemu_cond_broadcast(&exclusive_resume);
-    qemu_mutex_unlock(&qemu_cpu_list_lock);
-}
-
-/* Wait for exclusive ops to finish, and begin cpu execution.  */
-void cpu_exec_start(CPUState *cpu)
-{
-    qatomic_set(&cpu->running, true);
-
-    /* Write cpu->running before reading pending_cpus.  */
-    smp_mb();
-
-    /* 1. start_exclusive saw cpu->running == true and pending_cpus >= 1.
-     * After taking the lock we'll see cpu->has_waiter == true and run---not
-     * for long because start_exclusive kicked us.  cpu_exec_end will
-     * decrement pending_cpus and signal the waiter.
-     *
-     * 2. start_exclusive saw cpu->running == false but pending_cpus >= 1.
-     * This includes the case when an exclusive item is running now.
-     * Then we'll see cpu->has_waiter == false and wait for the item to
-     * complete.
-     *
-     * 3. pending_cpus == 0.  Then start_exclusive is definitely going to
-     * see cpu->running == true, and it will kick the CPU.
-     */
-    if (unlikely(qatomic_read(&pending_cpus))) {
-        QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
-        if (!cpu->has_waiter) {
-            /* Not counted in pending_cpus, let the exclusive item
-             * run.  Since we have the lock, just set cpu->running to true
-             * while holding it; no need to check pending_cpus again.
-             */
-            qatomic_set(&cpu->running, false);
-            exclusive_idle();
-            /* Now pending_cpus is zero.  */
-            qatomic_set(&cpu->running, true);
-        } else {
-            /* Counted in pending_cpus, go ahead and release the
-             * waiter at cpu_exec_end.
-             */
-        }
-    }
-}
-
-/* Mark cpu as not executing, and release pending exclusive ops.  */
-void cpu_exec_end(CPUState *cpu)
-{
-    qatomic_set(&cpu->running, false);
-
-    /* Write cpu->running before reading pending_cpus.  */
-    smp_mb();
-
-    /* 1. start_exclusive saw cpu->running == true.  Then it will increment
-     * pending_cpus and wait for exclusive_cond.  After taking the lock
-     * we'll see cpu->has_waiter == true.
-     *
-     * 2. start_exclusive saw cpu->running == false but here pending_cpus >= 1.
-     * This includes the case when an exclusive item started after setting
-     * cpu->running to false and before we read pending_cpus.  Then we'll see
-     * cpu->has_waiter == false and not touch pending_cpus.  The next call to
-     * cpu_exec_start will run exclusive_idle if still necessary, thus waiting
-     * for the item to complete.
-     *
-     * 3. pending_cpus == 0.  Then start_exclusive is definitely going to
-     * see cpu->running == false, and it can ignore this CPU until the
-     * next cpu_exec_start.
-     */
-    if (unlikely(qatomic_read(&pending_cpus))) {
-        QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
-        if (cpu->has_waiter) {
-            cpu->has_waiter = false;
-            qatomic_set(&pending_cpus, pending_cpus - 1);
-            if (pending_cpus == 1) {
-                qemu_cond_signal(&exclusive_cond);
-            }
-        }
-    }
-}
-
-void async_safe_run_on_cpu(CPUState *cpu, run_on_cpu_func func,
-                           run_on_cpu_data data)
-{
-    struct qemu_work_item *wi;
-
-    wi = g_new0(struct qemu_work_item, 1);
-    wi->func = func;
-    wi->data = data;
-    wi->free = true;
-    wi->exclusive = true;
-
-    queue_work_on_cpu(cpu, wi);
-}
-
-void process_queued_cpu_work(CPUState *cpu)
-{
-    struct qemu_work_item *wi;
-
-    qemu_mutex_lock(&cpu->work_mutex);
-    if (QSIMPLEQ_EMPTY(&cpu->work_list)) {
-        qemu_mutex_unlock(&cpu->work_mutex);
-        return;
-    }
-    while (!QSIMPLEQ_EMPTY(&cpu->work_list)) {
-        wi = QSIMPLEQ_FIRST(&cpu->work_list);
-        QSIMPLEQ_REMOVE_HEAD(&cpu->work_list, node);
-        qemu_mutex_unlock(&cpu->work_mutex);
-        if (wi->exclusive) {
-            /* Running work items outside the BQL avoids the following deadlock:
-             * 1) start_exclusive() is called with the BQL taken while another
-             * CPU is running; 2) cpu_exec in the other CPU tries to takes the
-             * BQL, so it goes to sleep; start_exclusive() is sleeping too, so
-             * neither CPU can proceed.
-             */
-            qemu_mutex_unlock_iothread();
-            start_exclusive();
-            wi->func(cpu, wi->data);
-            end_exclusive();
-            qemu_mutex_lock_iothread();
-        } else {
-            wi->func(cpu, wi->data);
-        }
-        qemu_mutex_lock(&cpu->work_mutex);
-        if (wi->free) {
-            g_free(wi);
-        } else {
-            qatomic_store_release(&wi->done, true);
-        }
-    }
-    qemu_mutex_unlock(&cpu->work_mutex);
-    qemu_cond_broadcast(&qemu_work_cond);
-}
-
-/* Add a breakpoint.  */
-int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
-                          CPUBreakpoint **breakpoint)
-{
-    CPUClass *cc = CPU_GET_CLASS(cpu);
-    CPUBreakpoint *bp;
-
-    if (cc->gdb_adjust_breakpoint) {
-        pc = cc->gdb_adjust_breakpoint(cpu, pc);
-    }
-
-    bp = g_malloc(sizeof(*bp));
-
-    bp->pc = pc;
-    bp->flags = flags;
-
-    /* keep all GDB-injected breakpoints in front */
-    if (flags & BP_GDB) {
-        QTAILQ_INSERT_HEAD(&cpu->breakpoints, bp, entry);
-    } else {
-        QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
-    }
-
-    if (breakpoint) {
-        *breakpoint = bp;
-    }
-
-    trace_breakpoint_insert(cpu->cpu_index, pc, flags);
-    return 0;
-}
-
-/* Remove a specific breakpoint.  */
-int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
-{
-    CPUClass *cc = CPU_GET_CLASS(cpu);
-    CPUBreakpoint *bp;
-
-    if (cc->gdb_adjust_breakpoint) {
-        pc = cc->gdb_adjust_breakpoint(cpu, pc);
-    }
-
-    QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
-        if (bp->pc == pc && bp->flags == flags) {
-            cpu_breakpoint_remove_by_ref(cpu, bp);
-            return 0;
-        }
-    }
-    return -ENOENT;
-}
-
-/* Remove a specific breakpoint by reference.  */
-void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *bp)
-{
-    QTAILQ_REMOVE(&cpu->breakpoints, bp, entry);
-
-    trace_breakpoint_remove(cpu->cpu_index, bp->pc, bp->flags);
-    g_free(bp);
-}
-
-/* Remove all matching breakpoints. */
-void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
-{
-    CPUBreakpoint *bp, *next;
-
-    QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
-        if (bp->flags & mask) {
-            cpu_breakpoint_remove_by_ref(cpu, bp);
-        }
-    }
-}