mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 09:55:55 +00:00
![Stefan Hajnoczi](/assets/img/avatar_default.png)
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>
534 lines
16 KiB
C++
534 lines
16 KiB
C++
/*
|
|
* Physical memory access templates
|
|
*
|
|
* Copyright (c) 2003 Fabrice Bellard
|
|
* Copyright (c) 2015 Linaro, Inc.
|
|
* Copyright (c) 2016 Red Hat, Inc.
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
/* warning: addr must be aligned */
|
|
static inline uint32_t glue(address_space_ldl_internal, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result,
|
|
enum device_endian endian)
|
|
{
|
|
uint8_t *ptr;
|
|
uint64_t val;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 4;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, false, attrs);
|
|
if (l < 4 || !memory_access_is_direct(mr, false)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
|
|
/* I/O case */
|
|
r = memory_region_dispatch_read(mr, addr1, &val,
|
|
MO_32 | devend_memop(endian), attrs);
|
|
} else {
|
|
/* RAM case */
|
|
fuzz_dma_read_cb(addr, 4, mr);
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (endian) {
|
|
case DEVICE_LITTLE_ENDIAN:
|
|
val = ldl_le_p(ptr);
|
|
break;
|
|
case DEVICE_BIG_ENDIAN:
|
|
val = ldl_be_p(ptr);
|
|
break;
|
|
default:
|
|
val = ldl_p(ptr);
|
|
break;
|
|
}
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
return val;
|
|
}
|
|
|
|
uint32_t glue(address_space_ldl, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_ldl_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_NATIVE_ENDIAN);
|
|
}
|
|
|
|
uint32_t glue(address_space_ldl_le, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_ldl_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_LITTLE_ENDIAN);
|
|
}
|
|
|
|
uint32_t glue(address_space_ldl_be, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_ldl_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_BIG_ENDIAN);
|
|
}
|
|
|
|
/* warning: addr must be aligned */
|
|
static inline uint64_t glue(address_space_ldq_internal, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result,
|
|
enum device_endian endian)
|
|
{
|
|
uint8_t *ptr;
|
|
uint64_t val;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 8;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, false, attrs);
|
|
if (l < 8 || !memory_access_is_direct(mr, false)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
|
|
/* I/O case */
|
|
r = memory_region_dispatch_read(mr, addr1, &val,
|
|
MO_64 | devend_memop(endian), attrs);
|
|
} else {
|
|
/* RAM case */
|
|
fuzz_dma_read_cb(addr, 8, mr);
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (endian) {
|
|
case DEVICE_LITTLE_ENDIAN:
|
|
val = ldq_le_p(ptr);
|
|
break;
|
|
case DEVICE_BIG_ENDIAN:
|
|
val = ldq_be_p(ptr);
|
|
break;
|
|
default:
|
|
val = ldq_p(ptr);
|
|
break;
|
|
}
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
return val;
|
|
}
|
|
|
|
uint64_t glue(address_space_ldq, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_ldq_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_NATIVE_ENDIAN);
|
|
}
|
|
|
|
uint64_t glue(address_space_ldq_le, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_ldq_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_LITTLE_ENDIAN);
|
|
}
|
|
|
|
uint64_t glue(address_space_ldq_be, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_ldq_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_BIG_ENDIAN);
|
|
}
|
|
|
|
uint8_t glue(address_space_ldub, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
uint8_t *ptr;
|
|
uint64_t val;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 1;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, false, attrs);
|
|
if (!memory_access_is_direct(mr, false)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
|
|
/* I/O case */
|
|
r = memory_region_dispatch_read(mr, addr1, &val, MO_8, attrs);
|
|
} else {
|
|
/* RAM case */
|
|
fuzz_dma_read_cb(addr, 1, mr);
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
val = ldub_p(ptr);
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
return val;
|
|
}
|
|
|
|
/* warning: addr must be aligned */
|
|
static inline uint16_t glue(address_space_lduw_internal, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result,
|
|
enum device_endian endian)
|
|
{
|
|
uint8_t *ptr;
|
|
uint64_t val;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 2;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, false, attrs);
|
|
if (l < 2 || !memory_access_is_direct(mr, false)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
|
|
/* I/O case */
|
|
r = memory_region_dispatch_read(mr, addr1, &val,
|
|
MO_16 | devend_memop(endian), attrs);
|
|
} else {
|
|
/* RAM case */
|
|
fuzz_dma_read_cb(addr, 2, mr);
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (endian) {
|
|
case DEVICE_LITTLE_ENDIAN:
|
|
val = lduw_le_p(ptr);
|
|
break;
|
|
case DEVICE_BIG_ENDIAN:
|
|
val = lduw_be_p(ptr);
|
|
break;
|
|
default:
|
|
val = lduw_p(ptr);
|
|
break;
|
|
}
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
return val;
|
|
}
|
|
|
|
uint16_t glue(address_space_lduw, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_lduw_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_NATIVE_ENDIAN);
|
|
}
|
|
|
|
uint16_t glue(address_space_lduw_le, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_lduw_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_LITTLE_ENDIAN);
|
|
}
|
|
|
|
uint16_t glue(address_space_lduw_be, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
return glue(address_space_lduw_internal, SUFFIX)(ARG1, addr, attrs, result,
|
|
DEVICE_BIG_ENDIAN);
|
|
}
|
|
|
|
/* warning: addr must be aligned. The ram page is not masked as dirty
|
|
and the code inside is not invalidated. It is useful if the dirty
|
|
bits are used to track modified PTEs */
|
|
void glue(address_space_stl_notdirty, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
uint8_t *ptr;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 4;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
uint8_t dirty_log_mask;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, true, attrs);
|
|
if (l < 4 || !memory_access_is_direct(mr, true)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
|
|
r = memory_region_dispatch_write(mr, addr1, val, MO_32, attrs);
|
|
} else {
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
stl_p(ptr, val);
|
|
|
|
dirty_log_mask = memory_region_get_dirty_log_mask(mr);
|
|
dirty_log_mask &= ~(1 << DIRTY_MEMORY_CODE);
|
|
cpu_physical_memory_set_dirty_range(memory_region_get_ram_addr(mr) + addr,
|
|
4, dirty_log_mask);
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
}
|
|
|
|
/* warning: addr must be aligned */
|
|
static inline void glue(address_space_stl_internal, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint32_t val, MemTxAttrs attrs,
|
|
MemTxResult *result, enum device_endian endian)
|
|
{
|
|
uint8_t *ptr;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 4;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, true, attrs);
|
|
if (l < 4 || !memory_access_is_direct(mr, true)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
r = memory_region_dispatch_write(mr, addr1, val,
|
|
MO_32 | devend_memop(endian), attrs);
|
|
} else {
|
|
/* RAM case */
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (endian) {
|
|
case DEVICE_LITTLE_ENDIAN:
|
|
stl_le_p(ptr, val);
|
|
break;
|
|
case DEVICE_BIG_ENDIAN:
|
|
stl_be_p(ptr, val);
|
|
break;
|
|
default:
|
|
stl_p(ptr, val);
|
|
break;
|
|
}
|
|
invalidate_and_set_dirty(mr, addr1, 4);
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
}
|
|
|
|
void glue(address_space_stl, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stl_internal, SUFFIX)(ARG1, addr, val, attrs,
|
|
result, DEVICE_NATIVE_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stl_le, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stl_internal, SUFFIX)(ARG1, addr, val, attrs,
|
|
result, DEVICE_LITTLE_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stl_be, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stl_internal, SUFFIX)(ARG1, addr, val, attrs,
|
|
result, DEVICE_BIG_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stb, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint8_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
uint8_t *ptr;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 1;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, true, attrs);
|
|
if (!memory_access_is_direct(mr, true)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
r = memory_region_dispatch_write(mr, addr1, val, MO_8, attrs);
|
|
} else {
|
|
/* RAM case */
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
stb_p(ptr, val);
|
|
invalidate_and_set_dirty(mr, addr1, 1);
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
}
|
|
|
|
/* warning: addr must be aligned */
|
|
static inline void glue(address_space_stw_internal, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint16_t val, MemTxAttrs attrs,
|
|
MemTxResult *result, enum device_endian endian)
|
|
{
|
|
uint8_t *ptr;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 2;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, true, attrs);
|
|
if (l < 2 || !memory_access_is_direct(mr, true)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
r = memory_region_dispatch_write(mr, addr1, val,
|
|
MO_16 | devend_memop(endian), attrs);
|
|
} else {
|
|
/* RAM case */
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (endian) {
|
|
case DEVICE_LITTLE_ENDIAN:
|
|
stw_le_p(ptr, val);
|
|
break;
|
|
case DEVICE_BIG_ENDIAN:
|
|
stw_be_p(ptr, val);
|
|
break;
|
|
default:
|
|
stw_p(ptr, val);
|
|
break;
|
|
}
|
|
invalidate_and_set_dirty(mr, addr1, 2);
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
}
|
|
|
|
void glue(address_space_stw, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint16_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stw_internal, SUFFIX)(ARG1, addr, val, attrs, result,
|
|
DEVICE_NATIVE_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stw_le, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint16_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stw_internal, SUFFIX)(ARG1, addr, val, attrs, result,
|
|
DEVICE_LITTLE_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stw_be, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint16_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stw_internal, SUFFIX)(ARG1, addr, val, attrs, result,
|
|
DEVICE_BIG_ENDIAN);
|
|
}
|
|
|
|
static void glue(address_space_stq_internal, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint64_t val, MemTxAttrs attrs,
|
|
MemTxResult *result, enum device_endian endian)
|
|
{
|
|
uint8_t *ptr;
|
|
MemoryRegion *mr;
|
|
hwaddr l = 8;
|
|
hwaddr addr1;
|
|
MemTxResult r;
|
|
bool release_lock = false;
|
|
|
|
RCU_READ_LOCK();
|
|
mr = TRANSLATE(addr, &addr1, &l, true, attrs);
|
|
if (l < 8 || !memory_access_is_direct(mr, true)) {
|
|
release_lock |= prepare_mmio_access(mr);
|
|
r = memory_region_dispatch_write(mr, addr1, val,
|
|
MO_64 | devend_memop(endian), attrs);
|
|
} else {
|
|
/* RAM case */
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
switch (endian) {
|
|
case DEVICE_LITTLE_ENDIAN:
|
|
stq_le_p(ptr, val);
|
|
break;
|
|
case DEVICE_BIG_ENDIAN:
|
|
stq_be_p(ptr, val);
|
|
break;
|
|
default:
|
|
stq_p(ptr, val);
|
|
break;
|
|
}
|
|
invalidate_and_set_dirty(mr, addr1, 8);
|
|
r = MEMTX_OK;
|
|
}
|
|
if (result) {
|
|
*result = r;
|
|
}
|
|
if (release_lock) {
|
|
bql_unlock();
|
|
}
|
|
RCU_READ_UNLOCK();
|
|
}
|
|
|
|
void glue(address_space_stq, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stq_internal, SUFFIX)(ARG1, addr, val, attrs, result,
|
|
DEVICE_NATIVE_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stq_le, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stq_internal, SUFFIX)(ARG1, addr, val, attrs, result,
|
|
DEVICE_LITTLE_ENDIAN);
|
|
}
|
|
|
|
void glue(address_space_stq_be, SUFFIX)(ARG1_DECL,
|
|
hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
glue(address_space_stq_internal, SUFFIX)(ARG1, addr, val, attrs, result,
|
|
DEVICE_BIG_ENDIAN);
|
|
}
|
|
|
|
#undef ARG1_DECL
|
|
#undef ARG1
|
|
#undef SUFFIX
|
|
#undef TRANSLATE
|
|
#undef RCU_READ_LOCK
|
|
#undef RCU_READ_UNLOCK
|