#include "exec/ioport.h"
#include "qemu/bitops.h"
#include "qom/object.h"
-#include "sysemu/kvm.h"
+#include "trace.h"
#include <assert.h>
#include "exec/memory-internal.h"
static bool memory_region_update_pending;
static bool global_dirty_log = false;
+/* flat_view_mutex is taken around reading as->current_map; the critical
+ * section is extremely short, so I'm using a single mutex for every AS.
+ * We could also RCU for the read-side.
+ *
+ * The BQL is taken around transaction commits, hence both locks are taken
+ * while writing to as->current_map (with the BQL taken outside).
+ */
+static QemuMutex flat_view_mutex;
+
static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
= QTAILQ_HEAD_INITIALIZER(memory_listeners);
static QTAILQ_HEAD(, AddressSpace) address_spaces
= QTAILQ_HEAD_INITIALIZER(address_spaces);
+static void memory_init(void)
+{
+ qemu_mutex_init(&flat_view_mutex);
+}
+
typedef struct AddrRange AddrRange;
/*
} \
} while (0)
+/* No need to ref/unref .mr, the FlatRange keeps it alive. */
#define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback) \
MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) { \
.mr = (fr)->mr, \
* order.
*/
struct FlatView {
+ unsigned ref;
FlatRange *ranges;
unsigned nr;
unsigned nr_allocated;
static void flatview_init(FlatView *view)
{
+ view->ref = 1;
view->ranges = NULL;
view->nr = 0;
view->nr_allocated = 0;
memmove(view->ranges + pos + 1, view->ranges + pos,
(view->nr - pos) * sizeof(FlatRange));
view->ranges[pos] = *range;
+ memory_region_ref(range->mr);
++view->nr;
}
static void flatview_destroy(FlatView *view)
{
+ int i;
+
+ for (i = 0; i < view->nr; i++) {
+ memory_region_unref(view->ranges[i].mr);
+ }
g_free(view->ranges);
+ g_free(view);
+}
+
+static void flatview_ref(FlatView *view)
+{
+ atomic_inc(&view->ref);
+}
+
+static void flatview_unref(FlatView *view)
+{
+ if (atomic_fetch_dec(&view->ref) == 1) {
+ flatview_destroy(view);
+ }
}
static bool can_merge(FlatRange *r1, FlatRange *r2)
}
}
-static void memory_region_oldmmio_read_accessor(void *opaque,
+static bool memory_region_big_endian(MemoryRegion *mr)
+{
+#ifdef TARGET_WORDS_BIGENDIAN
+ return mr->ops->endianness != DEVICE_LITTLE_ENDIAN;
+#else
+ return mr->ops->endianness == DEVICE_BIG_ENDIAN;
+#endif
+}
+
+static bool memory_region_wrong_endianness(MemoryRegion *mr)
+{
+#ifdef TARGET_WORDS_BIGENDIAN
+ return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
+#else
+ return mr->ops->endianness == DEVICE_BIG_ENDIAN;
+#endif
+}
+
+static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
+{
+ if (memory_region_wrong_endianness(mr)) {
+ switch (size) {
+ case 1:
+ break;
+ case 2:
+ *data = bswap16(*data);
+ break;
+ case 4:
+ *data = bswap32(*data);
+ break;
+ case 8:
+ *data = bswap64(*data);
+ break;
+ default:
+ abort();
+ }
+ }
+}
+
+static void memory_region_oldmmio_read_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
{
- MemoryRegion *mr = opaque;
uint64_t tmp;
tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
+ trace_memory_region_ops_read(mr, addr, tmp, size);
*value |= (tmp & mask) << shift;
}
-static void memory_region_read_accessor(void *opaque,
+static void memory_region_read_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
{
- MemoryRegion *mr = opaque;
uint64_t tmp;
if (mr->flush_coalesced_mmio) {
qemu_flush_coalesced_mmio_buffer();
}
tmp = mr->ops->read(mr->opaque, addr, size);
+ trace_memory_region_ops_read(mr, addr, tmp, size);
*value |= (tmp & mask) << shift;
}
-static void memory_region_oldmmio_write_accessor(void *opaque,
+static void memory_region_oldmmio_write_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
{
- MemoryRegion *mr = opaque;
uint64_t tmp;
tmp = (*value >> shift) & mask;
+ trace_memory_region_ops_write(mr, addr, tmp, size);
mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
}
-static void memory_region_write_accessor(void *opaque,
+static void memory_region_write_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
{
- MemoryRegion *mr = opaque;
uint64_t tmp;
if (mr->flush_coalesced_mmio) {
qemu_flush_coalesced_mmio_buffer();
}
tmp = (*value >> shift) & mask;
+ trace_memory_region_ops_write(mr, addr, tmp, size);
mr->ops->write(mr->opaque, addr, tmp, size);
}
unsigned size,
unsigned access_size_min,
unsigned access_size_max,
- void (*access)(void *opaque,
+ void (*access)(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask),
- void *opaque)
+ MemoryRegion *mr)
{
uint64_t access_mask;
unsigned access_size;
/* FIXME: support unaligned access? */
access_size = MAX(MIN(size, access_size_max), access_size_min);
access_mask = -1ULL >> (64 - access_size * 8);
- for (i = 0; i < size; i += access_size) {
-#ifdef TARGET_WORDS_BIGENDIAN
- access(opaque, addr + i, value, access_size,
- (size - access_size - i) * 8, access_mask);
-#else
- access(opaque, addr + i, value, access_size, i * 8, access_mask);
-#endif
+ if (memory_region_big_endian(mr)) {
+ for (i = 0; i < size; i += access_size) {
+ access(mr, addr + i, value, access_size,
+ (size - access_size - i) * 8, access_mask);
+ }
+ } else {
+ for (i = 0; i < size; i += access_size) {
+ access(mr, addr + i, value, access_size, i * 8, access_mask);
+ }
}
}
}
/* Render a memory topology into a list of disjoint absolute ranges. */
-static FlatView generate_memory_topology(MemoryRegion *mr)
+static FlatView *generate_memory_topology(MemoryRegion *mr)
{
- FlatView view;
+ FlatView *view;
- flatview_init(&view);
+ view = g_new(FlatView, 1);
+ flatview_init(view);
if (mr) {
- render_memory_region(&view, mr, int128_zero(),
+ render_memory_region(view, mr, int128_zero(),
addrrange_make(int128_zero(), int128_2_64()), false);
}
- flatview_simplify(&view);
+ flatview_simplify(view);
return view;
}
}
}
+static FlatView *address_space_get_flatview(AddressSpace *as)
+{
+ FlatView *view;
+
+ qemu_mutex_lock(&flat_view_mutex);
+ view = as->current_map;
+ flatview_ref(view);
+ qemu_mutex_unlock(&flat_view_mutex);
+ return view;
+}
+
static void address_space_update_ioeventfds(AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
unsigned ioeventfd_nb = 0;
MemoryRegionIoeventfd *ioeventfds = NULL;
AddrRange tmp;
unsigned i;
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = address_space_get_flatview(as);
+ FOR_EACH_FLAT_RANGE(fr, view) {
for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
int128_sub(fr->addr.start,
g_free(as->ioeventfds);
as->ioeventfds = ioeventfds;
as->ioeventfd_nb = ioeventfd_nb;
+ flatview_unref(view);
}
static void address_space_update_topology_pass(AddressSpace *as,
- FlatView old_view,
- FlatView new_view,
+ const FlatView *old_view,
+ const FlatView *new_view,
bool adding)
{
unsigned iold, inew;
* Kill ranges in the old map, and instantiate ranges in the new map.
*/
iold = inew = 0;
- while (iold < old_view.nr || inew < new_view.nr) {
- if (iold < old_view.nr) {
- frold = &old_view.ranges[iold];
+ while (iold < old_view->nr || inew < new_view->nr) {
+ if (iold < old_view->nr) {
+ frold = &old_view->ranges[iold];
} else {
frold = NULL;
}
- if (inew < new_view.nr) {
- frnew = &new_view.ranges[inew];
+ if (inew < new_view->nr) {
+ frnew = &new_view->ranges[inew];
} else {
frnew = NULL;
}
static void address_space_update_topology(AddressSpace *as)
{
- FlatView old_view = *as->current_map;
- FlatView new_view = generate_memory_topology(as->root);
+ FlatView *old_view = address_space_get_flatview(as);
+ FlatView *new_view = generate_memory_topology(as->root);
address_space_update_topology_pass(as, old_view, new_view, false);
address_space_update_topology_pass(as, old_view, new_view, true);
- *as->current_map = new_view;
- flatview_destroy(&old_view);
+ qemu_mutex_lock(&flat_view_mutex);
+ flatview_unref(as->current_map);
+ as->current_map = new_view;
+ qemu_mutex_unlock(&flat_view_mutex);
+
+ /* Note that all the old MemoryRegions are still alive up to this
+ * point. This relieves most MemoryListeners from the need to
+ * ref/unref the MemoryRegions they get---unless they use them
+ * outside the iothread mutex, in which case precise reference
+ * counting is necessary.
+ */
+ flatview_unref(old_view);
+
address_space_update_ioeventfds(as);
}
qemu_ram_free(mr->ram_addr);
}
+static void memory_region_destructor_alias(MemoryRegion *mr)
+{
+ memory_region_unref(mr->alias);
+}
+
static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
{
qemu_ram_free_from_ptr(mr->ram_addr);
qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
}
-static bool memory_region_wrong_endianness(MemoryRegion *mr)
-{
-#ifdef TARGET_WORDS_BIGENDIAN
- return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
-#else
- return mr->ops->endianness == DEVICE_BIG_ENDIAN;
-#endif
-}
-
void memory_region_init(MemoryRegion *mr,
Object *owner,
const char *name,
mr->owner = owner;
mr->iommu_ops = NULL;
mr->parent = NULL;
- mr->owner = NULL;
mr->size = int128_make64(size);
if (size == UINT64_MAX) {
mr->size = int128_2_64();
#ifdef DEBUG_UNASSIGNED
printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
#endif
- if (cpu_single_env != NULL) {
- cpu_unassigned_access(ENV_GET_CPU(cpu_single_env),
- addr, false, false, 0, size);
+ if (current_cpu != NULL) {
+ cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
}
return 0;
}
#ifdef DEBUG_UNASSIGNED
printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
#endif
- if (cpu_single_env != NULL) {
- cpu_unassigned_access(ENV_GET_CPU(cpu_single_env),
- addr, true, false, 0, size);
+ if (current_cpu != NULL) {
+ cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
}
}
return data;
}
-static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
-{
- if (memory_region_wrong_endianness(mr)) {
- switch (size) {
- case 1:
- break;
- case 2:
- *data = bswap16(*data);
- break;
- case 4:
- *data = bswap32(*data);
- break;
- case 8:
- *data = bswap64(*data);
- break;
- default:
- abort();
- }
- }
-}
-
static bool memory_region_dispatch_read(MemoryRegion *mr,
hwaddr addr,
uint64_t *pval,
uint64_t size)
{
memory_region_init(mr, owner, name, size);
+ memory_region_ref(orig);
+ mr->destructor = memory_region_destructor_alias;
mr->alias = orig;
mr->alias_offset = offset;
}
return mr->owner;
}
+void memory_region_ref(MemoryRegion *mr)
+{
+ if (mr && mr->owner) {
+ object_ref(mr->owner);
+ }
+}
+
+void memory_region_unref(MemoryRegion *mr)
+{
+ if (mr && mr->owner) {
+ object_unref(mr->owner);
+ }
+}
+
uint64_t memory_region_size(MemoryRegion *mr)
{
if (int128_eq(mr->size, int128_2_64())) {
FlatRange *fr;
QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ FlatView *view = address_space_get_flatview(as);
+ FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
}
}
+ flatview_unref(view);
}
}
static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
CoalescedMemoryRange *cmr;
AddrRange tmp;
MemoryRegionSection section;
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = address_space_get_flatview(as);
+ FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
section = (MemoryRegionSection) {
.address_space = as,
}
}
}
+ flatview_unref(view);
}
static void memory_region_update_coalesced_range(MemoryRegion *mr)
memory_region_transaction_begin();
assert(!subregion->parent);
+ memory_region_ref(subregion);
subregion->parent = mr;
subregion->addr = offset;
QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
void memory_region_add_subregion_overlap(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion,
- unsigned priority)
+ int priority)
{
subregion->may_overlap = true;
subregion->priority = priority;
assert(subregion->parent == mr);
subregion->parent = NULL;
QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
+ memory_region_unref(subregion);
memory_region_update_pending |= mr->enabled && subregion->enabled;
memory_region_transaction_commit();
}
void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
{
MemoryRegion *parent = mr->parent;
- unsigned priority = mr->priority;
+ int priority = mr->priority;
bool may_overlap = mr->may_overlap;
if (addr == mr->addr || !parent) {
}
memory_region_transaction_begin();
+ memory_region_ref(mr);
memory_region_del_subregion(parent, mr);
if (may_overlap) {
memory_region_add_subregion_overlap(parent, addr, mr, priority);
} else {
memory_region_add_subregion(parent, addr, mr);
}
+ memory_region_unref(mr);
memory_region_transaction_commit();
}
return 0;
}
-static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
+static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
{
- return bsearch(&addr, as->current_map->ranges, as->current_map->nr,
+ return bsearch(&addr, view->ranges, view->nr,
sizeof(FlatRange), cmp_flatrange_addr);
}
+bool memory_region_present(MemoryRegion *parent, hwaddr addr)
+{
+ MemoryRegion *mr = memory_region_find(parent, addr, 1).mr;
+ if (!mr) {
+ return false;
+ }
+ memory_region_unref(mr);
+ return true;
+}
+
MemoryRegionSection memory_region_find(MemoryRegion *mr,
hwaddr addr, uint64_t size)
{
MemoryRegion *root;
AddressSpace *as;
AddrRange range;
+ FlatView *view;
FlatRange *fr;
addr += mr->addr;
as = memory_region_to_address_space(root);
range = addrrange_make(int128_make64(addr), int128_make64(size));
- fr = address_space_lookup(as, range);
+
+ view = address_space_get_flatview(as);
+ fr = flatview_lookup(view, range);
if (!fr) {
return ret;
}
- while (fr > as->current_map->ranges
- && addrrange_intersects(fr[-1].addr, range)) {
+ while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
--fr;
}
ret.size = range.size;
ret.offset_within_address_space = int128_get64(range.start);
ret.readonly = fr->readonly;
+ memory_region_ref(ret.mr);
+
+ flatview_unref(view);
return ret;
}
void address_space_sync_dirty_bitmap(AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = address_space_get_flatview(as);
+ FOR_EACH_FLAT_RANGE(fr, view) {
MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
}
+ flatview_unref(view);
}
void memory_global_dirty_log_start(void)
static void listener_add_address_space(MemoryListener *listener,
AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
if (listener->address_space_filter
}
}
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = address_space_get_flatview(as);
+ FOR_EACH_FLAT_RANGE(fr, view) {
MemoryRegionSection section = {
.mr = fr->mr,
.address_space = as,
listener->region_add(listener, §ion);
}
}
+ flatview_unref(view);
}
void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
{
+ if (QTAILQ_EMPTY(&address_spaces)) {
+ memory_init();
+ }
+
memory_region_transaction_begin();
as->root = root;
as->current_map = g_new(FlatView, 1);
memory_region_transaction_commit();
QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
address_space_destroy_dispatch(as);
- flatview_destroy(as->current_map);
+ flatview_unref(as->current_map);
g_free(as->name);
- g_free(as->current_map);
g_free(as->ioeventfds);
}
"-" TARGET_FMT_plx "\n",
base + mr->addr,
base + mr->addr
- + (hwaddr)int128_get64(int128_sub(mr->size, int128_make64(1))),
+ + (int128_nz(mr->size) ?
+ (hwaddr)int128_get64(int128_sub(mr->size,
+ int128_one())) : 0),
mr->priority,
mr->romd_mode ? 'R' : '-',
!mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
mr->alias->name,
mr->alias_offset,
mr->alias_offset
- + (hwaddr)int128_get64(mr->size) - 1);
+ + (int128_nz(mr->size) ?
+ (hwaddr)int128_get64(int128_sub(mr->size,
+ int128_one())) : 0));
} else {
mon_printf(f,
TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
base + mr->addr,
base + mr->addr
- + (hwaddr)int128_get64(int128_sub(mr->size, int128_make64(1))),
+ + (int128_nz(mr->size) ?
+ (hwaddr)int128_get64(int128_sub(mr->size,
+ int128_one())) : 0),
mr->priority,
mr->romd_mode ? 'R' : '-',
!mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
projects / qemu.git / blobdiff