qemu-e2k/include/qemu/typedefs.h

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#ifndef QEMU_TYPEDEFS_H
#define QEMU_TYPEDEFS_H
/* A load of opaque types so that device init declarations don't have to
pull in all the real definitions. */
/* Please keep this list in alphabetical order */
typedef struct AdapterInfo AdapterInfo;
typedef struct AddressSpace AddressSpace;
typedef struct AioContext AioContext;
typedef struct AllwinnerAHCIState AllwinnerAHCIState;
typedef struct AudioState AudioState;
block: New BlockBackend A block device consists of a frontend device model and a backend. A block backend has a tree of block drivers doing the actual work. The tree is managed by the block layer. We currently use a single abstraction BlockDriverState both for tree nodes and the backend as a whole. Drawbacks: * Its API includes both stuff that makes sense only at the block backend level (root of the tree) and stuff that's only for use within the block layer. This makes the API bigger and more complex than necessary. Moreover, it's not obvious which interfaces are meant for device models, and which really aren't. * Since device models keep a reference to their backend, the backend object can't just be destroyed. But for media change, we need to replace the tree. Our solution is to make the BlockDriverState generic, with actual driver state in a separate object, pointed to by member opaque. That lets us replace the tree by deinitializing and reinitializing its root. This special need of the root makes the data structure awkward everywhere in the tree. The general plan is to separate the APIs into "block backend", for use by device models, monitor and whatever other code dealing with block backends, and "block driver", for use by the block layer and whatever other code (if any) dealing with trees and tree nodes. Code dealing with block backends, device models in particular, should become completely oblivious of BlockDriverState. This should let us clean up both APIs, and the tree data structures. This commit is a first step. It creates a minimal "block backend" API: type BlockBackend and functions to create, destroy and find them. BlockBackend objects are created and destroyed exactly when root BlockDriverState objects are created and destroyed. "Root" in the sense of "in bdrv_states". They're not yet used for anything; that'll come shortly. A root BlockDriverState is created with bdrv_new_root(), so where to create a BlockBackend is obvious. Where these roots get destroyed isn't always as obvious. It is obvious in qemu-img.c, qemu-io.c and qemu-nbd.c, and in error paths of blockdev_init(), blk_connect(). That leaves destruction of objects successfully created by blockdev_init() and blk_connect(). blockdev_init() is used only by drive_new() and qmp_blockdev_add(). Objects created by the latter are currently indestructible (see commit 48f364d "blockdev: Refuse to drive_del something added with blockdev-add" and commit 2d246f0 "blockdev: Introduce DriveInfo.enable_auto_del"). Objects created by the former get destroyed by drive_del(). Objects created by blk_connect() get destroyed by blk_disconnect(). BlockBackend is reference-counted. Its reference count never exceeds one so far, but that's going to change. In drive_del(), the BB's reference count is surely one now. The BDS's reference count is greater than one when something else is holding a reference, such as a block job. In this case, the BB is destroyed right away, but the BDS lives on until all extra references get dropped. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-07 13:59:04 +02:00
typedef struct BlockBackend BlockBackend;
typedef struct BlockBackendRootState BlockBackendRootState;
typedef struct BlockDriverState BlockDriverState;
typedef struct BusClass BusClass;
typedef struct BusState BusState;
typedef struct CharDriverState CharDriverState;
typedef struct CompatProperty CompatProperty;
typedef struct CPUAddressSpace CPUAddressSpace;
typedef struct DeviceListener DeviceListener;
typedef struct DeviceState DeviceState;
typedef struct DisplayChangeListener DisplayChangeListener;
typedef struct DisplayState DisplayState;
typedef struct DisplaySurface DisplaySurface;
typedef struct DriveInfo DriveInfo;
typedef struct EventNotifier EventNotifier;
fw_cfg: hard separation between the MMIO and I/O port mappings We are going to introduce a wide data register for fw_cfg, but only for the MMIO mapped device. The wide data register will also require the tightening of endiannesses. However we don't want to touch the I/O port mapped fw_cfg device at all. Currently QEMU provides a single fw_cfg device type that can handle both I/O port and MMIO mapping. This flexibility is not actually exploited by any board in the tree, but it renders restricting the above changes to MMIO very hard. Therefore, let's derive two classes from TYPE_FW_CFG: TYPE_FW_CFG_IO and TYPE_FW_CFG_MEM. TYPE_FW_CFG_IO incorporates the base I/O port and the related combined MemoryRegion. (NB: all boards in the tree that use the I/O port mapped flavor opt for the combined mapping; that is, when the data port overlays the high address byte of the selector port. Therefore we can drop the capability to map those I/O ports separately.) TYPE_FW_CFG_MEM incorporates the base addresses for the MMIO selector and data registers, and their respective MemoryRegions. The "realize" and "props" class members are specific to each new derived class, and become unused for the base class. The base class retains the "reset" member and the "vmsd" member, because the reset functionality and the set of migrated data are not specific to the mapping. The new functions fw_cfg_init_io() and fw_cfg_init_mem() expose the possible mappings in separation. For now fw_cfg_init() is retained as a compatibility shim that enforces the above assumptions. Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1419250305-31062-2-git-send-email-pbonzini@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-12-22 13:11:35 +01:00
typedef struct FWCfgIoState FWCfgIoState;
typedef struct FWCfgMemState FWCfgMemState;
typedef struct FWCfgState FWCfgState;
typedef struct HCIInfo HCIInfo;
typedef struct I2CBus I2CBus;
typedef struct I2SCodec I2SCodec;
typedef struct ISABus ISABus;
typedef struct ISADevice ISADevice;
typedef struct LoadStateEntry LoadStateEntry;
typedef struct MACAddr MACAddr;
typedef struct MachineClass MachineClass;
typedef struct MachineState MachineState;
typedef struct MemoryListener MemoryListener;
typedef struct MemoryMappingList MemoryMappingList;
typedef struct MemoryRegion MemoryRegion;
typedef struct MemoryRegionSection MemoryRegionSection;
typedef struct MigrationIncomingState MigrationIncomingState;
typedef struct MigrationParams MigrationParams;
typedef struct MigrationState MigrationState;
typedef struct Monitor Monitor;
typedef struct MonitorDef MonitorDef;
typedef struct MouseTransformInfo MouseTransformInfo;
typedef struct MSIMessage MSIMessage;
typedef struct NetClientState NetClientState;
typedef struct NetFilterState NetFilterState;
typedef struct NICInfo NICInfo;
typedef struct PcGuestInfo PcGuestInfo;
typedef struct PCIBridge PCIBridge;
typedef struct PCIBus PCIBus;
typedef struct PCIDevice PCIDevice;
typedef struct PCIEAERErr PCIEAERErr;
typedef struct PCIEAERLog PCIEAERLog;
typedef struct PCIEAERMsg PCIEAERMsg;
typedef struct PCIEPort PCIEPort;
typedef struct PCIESlot PCIESlot;
typedef struct PCIExpressDevice PCIExpressDevice;
typedef struct PCIExpressHost PCIExpressHost;
typedef struct PCIHostState PCIHostState;
typedef struct PCMachineClass PCMachineClass;
typedef struct PCMachineState PCMachineState;
typedef struct PCMCIACardState PCMCIACardState;
typedef struct PixelFormat PixelFormat;
typedef struct PostcopyDiscardState PostcopyDiscardState;
typedef struct Property Property;
typedef struct PropertyInfo PropertyInfo;
typedef struct QEMUBH QEMUBH;
typedef struct QemuConsole QemuConsole;
typedef struct QEMUFile QEMUFile;
typedef struct QemuOpt QemuOpt;
typedef struct QemuOpts QemuOpts;
typedef struct QemuOptsList QemuOptsList;
typedef struct QEMUSGList QEMUSGList;
typedef struct QEMUSizedBuffer QEMUSizedBuffer;
typedef struct QEMUTimer QEMUTimer;
typedef struct QEMUTimerListGroup QEMUTimerListGroup;
typedef struct QObject QObject;
typedef struct RAMBlock RAMBlock;
typedef struct Range Range;
typedef struct SerialState SerialState;
typedef struct SHPCDevice SHPCDevice;
typedef struct SMBusDevice SMBusDevice;
typedef struct SSIBus SSIBus;
typedef struct uWireSlave uWireSlave;
typedef struct VirtIODevice VirtIODevice;
typedef struct Visitor Visitor;
#endif /* QEMU_TYPEDEFS_H */