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memory: abstract address space operations 

Prepare for multiple address space support by abstracting away the details
of registering a memory range with qemu's flat representation into an
AddressSpace object.

Note operations which are memory specific are not abstracted, since they will
never be called on I/O address spaces anyway.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2011-07-26 14:26:05 +03:00 committed by Anthony Liguori
parent 1c0ffa58af
commit cc31e6e7b3
1 changed files with 81 additions and 30 deletions
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111
memory.c
View File

@ -82,12 +82,26 @@ struct FlatView {
unsigned nr_allocated;
};
typedef struct AddressSpace AddressSpace;
typedef struct AddressSpaceOps AddressSpaceOps;
/* A system address space - I/O, memory, etc. */
struct AddressSpace {
const AddressSpaceOps *ops;
MemoryRegion *root;
FlatView current_map;
};
struct AddressSpaceOps {
void (*range_add)(AddressSpace *as, FlatRange *fr);
void (*range_del)(AddressSpace *as, FlatRange *fr);
void (*log_start)(AddressSpace *as, FlatRange *fr);
void (*log_stop)(AddressSpace *as, FlatRange *fr);
};
#define FOR_EACH_FLAT_RANGE(var, view) \
for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
static FlatView current_memory_map;
static MemoryRegion *root_memory_region;
static bool flatrange_equal(FlatRange *a, FlatRange *b)
{
return a->mr == b->mr
@ -151,6 +165,54 @@ static void flatview_simplify(FlatView *view)
}
}
static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
{
ram_addr_t phys_offset, region_offset;
phys_offset = fr->mr->ram_addr;
region_offset = fr->offset_in_region;
/* cpu_register_physical_memory_log() wants region_offset for
* mmio, but prefers offseting phys_offset for RAM. Humour it.
*/
if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM) {
phys_offset += region_offset;
region_offset = 0;
}
cpu_register_physical_memory_log(fr->addr.start,
fr->addr.size,
phys_offset,
region_offset,
fr->dirty_log_mask);
}
static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
{
cpu_register_physical_memory(fr->addr.start, fr->addr.size,
IO_MEM_UNASSIGNED);
}
static void as_memory_log_start(AddressSpace *as, FlatRange *fr)
{
cpu_physical_log_start(fr->addr.start, fr->addr.size);
}
static void as_memory_log_stop(AddressSpace *as, FlatRange *fr)
{
cpu_physical_log_stop(fr->addr.start, fr->addr.size);
}
static const AddressSpaceOps address_space_ops_memory = {
.range_add = as_memory_range_add,
.range_del = as_memory_range_del,
.log_start = as_memory_log_start,
.log_stop = as_memory_log_stop,
};
static AddressSpace address_space_memory = {
.ops = &address_space_ops_memory,
};
/* Render a memory region into the global view. Ranges in @view obscure
* ranges in @mr.
*/
@ -243,13 +305,12 @@ static FlatView generate_memory_topology(MemoryRegion *mr)
return view;
}
static void memory_region_update_topology(void)
static void address_space_update_topology(AddressSpace *as)
{
FlatView old_view = current_memory_map;
FlatView new_view = generate_memory_topology(root_memory_region);
FlatView old_view = as->current_map;
FlatView new_view = generate_memory_topology(as->root);
unsigned iold, inew;
FlatRange *frold, *frnew;
ram_addr_t phys_offset, region_offset;
/* Generate a symmetric difference of the old and new memory maps.
* Kill ranges in the old map, and instantiate ranges in the new map.
@ -274,16 +335,15 @@ static void memory_region_update_topology(void)
&& !flatrange_equal(frold, frnew)))) {
/* In old, but (not in new, or in new but attributes changed). */
cpu_register_physical_memory(frold->addr.start, frold->addr.size,
IO_MEM_UNASSIGNED);
as->ops->range_del(as, frold);
++iold;
} else if (frold && frnew && flatrange_equal(frold, frnew)) {
/* In both (logging may have changed) */
if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
cpu_physical_log_stop(frnew->addr.start, frnew->addr.size);
as->ops->log_stop(as, frnew);
} else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
cpu_physical_log_start(frnew->addr.start, frnew->addr.size);
as->ops->log_start(as, frnew);
}
++iold;
@ -291,28 +351,19 @@ static void memory_region_update_topology(void)
} else {
/* In new */
phys_offset = frnew->mr->ram_addr;
region_offset = frnew->offset_in_region;
/* cpu_register_physical_memory_log() wants region_offset for
* mmio, but prefers offseting phys_offset for RAM. Humour it.
*/
if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM) {
phys_offset += region_offset;
region_offset = 0;
}
cpu_register_physical_memory_log(frnew->addr.start,
frnew->addr.size,
phys_offset,
region_offset,
frnew->dirty_log_mask);
as->ops->range_add(as, frnew);
++inew;
}
}
current_memory_map = new_view;
as->current_map = new_view;
flatview_destroy(&old_view);
}
static void memory_region_update_topology(void)
{
address_space_update_topology(&address_space_memory);
}
void memory_region_init(MemoryRegion *mr,
const char *name,
uint64_t size)
@ -558,7 +609,7 @@ void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
{
FlatRange *fr;
FOR_EACH_FLAT_RANGE(fr, &current_memory_map) {
FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
if (fr->mr == mr) {
cpu_physical_sync_dirty_bitmap(fr->addr.start,
fr->addr.start + fr->addr.size);
@ -597,7 +648,7 @@ static void memory_region_update_coalesced_range(MemoryRegion *mr)
CoalescedMemoryRange *cmr;
AddrRange tmp;
FOR_EACH_FLAT_RANGE(fr, &current_memory_map) {
FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
if (fr->mr == mr) {
qemu_unregister_coalesced_mmio(fr->addr.start, fr->addr.size);
QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
@ -707,6 +758,6 @@ void memory_region_del_subregion(MemoryRegion *mr,
void set_system_memory_map(MemoryRegion *mr)
{
root_memory_region = mr;
address_space_memory.root = mr;
memory_region_update_topology();
}