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exec: Remove MemoryRegion::global_locking field

Browse source 
Last uses of memory_region_clear_global_locking() have been
removed in commit 7070e085d4 ("acpi: mark PMTIMER as unlocked")
and commit 08565552f7 ("cputlb: Move NOTDIRTY handling from I/O
path to TLB path").
Remove memory_region_clear_global_locking() and the now unused
'global_locking' field in MemoryRegion.

Reported-by: Alexander Bulekov <alxndr@bu.edu>
Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200806150726.962-1-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-08-06 17:07:26 +02:00 committed by Paolo Bonzini
parent b2a3b8d787
commit 4174495408
4 changed files with 3 additions and 23 deletions
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4
accel/tcg/cputlb.c
View file

@ -1053,7 +1053,7 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
cpu_io_recompile(cpu, retaddr);
}
if (mr->global_locking && !qemu_mutex_iothread_locked()) {
if (!qemu_mutex_iothread_locked()) {
qemu_mutex_lock_iothread();
locked = true;
}
@ -1114,7 +1114,7 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
*/
save_iotlb_data(cpu, iotlbentry->addr, section, mr_offset);
if (mr->global_locking && !qemu_mutex_iothread_locked()) {
if (!qemu_mutex_iothread_locked()) {
qemu_mutex_lock_iothread();
locked = true;
}

2
exec.c
View file

@ -3137,7 +3137,7 @@ static bool prepare_mmio_access(MemoryRegion *mr)
bool unlocked = !qemu_mutex_iothread_locked();
bool release_lock = false;
if (unlocked && mr->global_locking) {
if (unlocked) {
qemu_mutex_lock_iothread();
unlocked = false;
release_lock = true;

14
include/exec/memory.h
View file

@ -404,7 +404,6 @@ struct MemoryRegion {
bool nonvolatile;
bool rom_device;
bool flush_coalesced_mmio;
bool global_locking;
uint8_t dirty_log_mask;
bool is_iommu;
RAMBlock *ram_block;
@ -1738,19 +1737,6 @@ void memory_region_set_flush_coalesced(MemoryRegion *mr);
*/
void memory_region_clear_flush_coalesced(MemoryRegion *mr);
/**
* memory_region_clear_global_locking: Declares that access processing does
* not depend on the QEMU global lock.
*
* By clearing this property, accesses to the memory region will be processed
* outside of QEMU's global lock (unless the lock is held on when issuing the
* access request). In this case, the device model implementing the access
* handlers is responsible for synchronization of concurrency.
*
* @mr: the memory region to be updated.
*/
void memory_region_clear_global_locking(MemoryRegion *mr);
/**
* memory_region_add_eventfd: Request an eventfd to be triggered when a word
* is written to a location.

6
softmmu/memory.c
View file

@ -1221,7 +1221,6 @@ static void memory_region_initfn(Object *obj)
mr->ops = &unassigned_mem_ops;
mr->enabled = true;
mr->romd_mode = true;
mr->global_locking = true;
mr->destructor = memory_region_destructor_none;
QTAILQ_INIT(&mr->subregions);
QTAILQ_INIT(&mr->coalesced);
@ -2277,11 +2276,6 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr)
}
}
void memory_region_clear_global_locking(MemoryRegion *mr)
{
mr->global_locking = false;
}
static bool userspace_eventfd_warning;
void memory_region_add_eventfd(MemoryRegion *mr,