motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-09 02:24:58 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

system/cpus: rename qemu_mutex_lock_iothread() to bql_lock()

Browse source 
The Big QEMU Lock (BQL) has many names and they are confusing. The
actual QemuMutex variable is called qemu_global_mutex but it's commonly
referred to as the BQL in discussions and some code comments. The
locking APIs, however, are called qemu_mutex_lock_iothread() and
qemu_mutex_unlock_iothread().

The "iothread" name is historic and comes from when the main thread was
split into into KVM vcpu threads and the "iothread" (now called the main
loop thread). I have contributed to the confusion myself by introducing
a separate --object iothread, a separate concept unrelated to the BQL.

The "iothread" name is no longer appropriate for the BQL. Rename the
locking APIs to:
- void bql_lock(void)
- void bql_unlock(void)
- bool bql_locked(void)

There are more APIs with "iothread" in their names. Subsequent patches
will rename them. There are also comments and documentation that will be
updated in later patches.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Fabiano Rosas <farosas@suse.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Peter Xu <peterx@redhat.com>
Acked-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Acked-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20240102153529.486531-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2024-01-02 10:35:25 -05:00
parent 897a06c6d7
commit 195801d700
95 changed files with 529 additions and 529 deletions
Download patch file Download diff file Expand all files Collapse all files

16
target/openrisc/sys_helper.c
View file

@ -160,20 +160,20 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
break;
case TO_SPR(9, 0): /* PICMR */
env->picmr = rb;
qemu_mutex_lock_iothread();
bql_lock();
if (env->picsr & env->picmr) {
cpu_interrupt(cs, CPU_INTERRUPT_HARD);
} else {
cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
}
qemu_mutex_unlock_iothread();
bql_unlock();
break;
case TO_SPR(9, 2): /* PICSR */
env->picsr &= ~rb;
break;
case TO_SPR(10, 0): /* TTMR */
{
qemu_mutex_lock_iothread();
bql_lock();
if ((env->ttmr & TTMR_M) ^ (rb & TTMR_M)) {
switch (rb & TTMR_M) {
case TIMER_NONE:
@ -198,15 +198,15 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
cs->interrupt_request &= ~CPU_INTERRUPT_TIMER;
}
cpu_openrisc_timer_update(cpu);
qemu_mutex_unlock_iothread();
bql_unlock();
}
break;
case TO_SPR(10, 1): /* TTCR */
qemu_mutex_lock_iothread();
bql_lock();
cpu_openrisc_count_set(cpu, rb);
cpu_openrisc_timer_update(cpu);
qemu_mutex_unlock_iothread();
bql_unlock();
break;
}
#endif
@ -347,9 +347,9 @@ target_ulong HELPER(mfspr)(CPUOpenRISCState *env, target_ulong rd,
return env->ttmr;
case TO_SPR(10, 1): /* TTCR */
qemu_mutex_lock_iothread();
bql_lock();
cpu_openrisc_count_update(cpu);
qemu_mutex_unlock_iothread();
bql_unlock();
return cpu_openrisc_count_get(cpu);
}
#endif