diff options
Diffstat (limited to 'include/exec')
| -rw-r--r-- | include/exec/cpu-common.h | 2 | ||||
| -rw-r--r-- | include/exec/memory.h | 45 |
2 files changed, 43 insertions, 4 deletions
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index 8bc397e251..815342d043 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -147,8 +147,6 @@ void *cpu_physical_memory_map(hwaddr addr, bool is_write); void cpu_physical_memory_unmap(void *buffer, hwaddr len, bool is_write, hwaddr access_len); -void cpu_register_map_client(QEMUBH *bh); -void cpu_unregister_map_client(QEMUBH *bh); bool cpu_physical_memory_is_io(hwaddr phys_addr); diff --git a/include/exec/memory.h b/include/exec/memory.h index dadb5cd65a..d417d7f363 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1112,6 +1112,19 @@ struct MemoryListener { QTAILQ_ENTRY(MemoryListener) link_as; }; +typedef struct AddressSpaceMapClient { + QEMUBH *bh; + QLIST_ENTRY(AddressSpaceMapClient) link; +} AddressSpaceMapClient; + +typedef struct { + MemoryRegion *mr; + void *buffer; + hwaddr addr; + hwaddr len; + bool in_use; +} BounceBuffer; + /** * struct AddressSpace: describes a mapping of addresses to #MemoryRegion objects */ @@ -1129,6 +1142,12 @@ struct AddressSpace { struct MemoryRegionIoeventfd *ioeventfds; QTAILQ_HEAD(, MemoryListener) listeners; QTAILQ_ENTRY(AddressSpace) address_spaces_link; + + /* Bounce buffer to use for this address space. */ + BounceBuffer bounce; + /* List of callbacks to invoke when buffers free up */ + QemuMutex map_client_list_lock; + QLIST_HEAD(, AddressSpaceMapClient) map_client_list; }; typedef struct AddressSpaceDispatch AddressSpaceDispatch; @@ -2946,8 +2965,8 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, hwaddr len, * May return %NULL and set *@plen to zero(0), if resources needed to perform * the mapping are exhausted. * Use only for reads OR writes - not for read-modify-write operations. - * Use cpu_register_map_client() to know when retrying the map operation is - * likely to succeed. + * Use address_space_register_map_client() to know when retrying the map + * operation is likely to succeed. * * @as: #AddressSpace to be accessed * @addr: address within that address space @@ -2972,6 +2991,28 @@ void *address_space_map(AddressSpace *as, hwaddr addr, void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len, bool is_write, hwaddr access_len); +/* + * address_space_register_map_client: Register a callback to invoke when + * resources for address_space_map() are available again. + * + * address_space_map may fail when there are not enough resources available, + * such as when bounce buffer memory would exceed the limit. The callback can + * be used to retry the address_space_map operation. Note that the callback + * gets automatically removed after firing. + * + * @as: #AddressSpace to be accessed + * @bh: callback to invoke when address_space_map() retry is appropriate + */ +void address_space_register_map_client(AddressSpace *as, QEMUBH *bh); + +/* + * address_space_unregister_map_client: Unregister a callback that has + * previously been registered and not fired yet. + * + * @as: #AddressSpace to be accessed + * @bh: callback to unregister + */ +void address_space_unregister_map_client(AddressSpace *as, QEMUBH *bh); /* Internal functions, part of the implementation of address_space_read. */ MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr, |