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visorbus.h
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// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2010 - 2013 UNISYS CORPORATION * All rights reserved. */ /* * This header file is to be included by other kernel mode components that * implement a particular kind of visor_device. Each of these other kernel * mode components is called a visor device driver. Refer to visortemplate * for a minimal sample visor device driver. * * There should be nothing in this file that is private to the visorbus * bus implementation itself. */ #ifndef __VISORBUS_H__ #define __VISORBUS_H__ #include <linux/device.h> #define VISOR_CHANNEL_SIGNATURE ('L' << 24 | 'N' << 16 | 'C' << 8 | 'E') /* * enum channel_serverstate * @CHANNELSRV_UNINITIALIZED: Channel is in an undefined state. * @CHANNELSRV_READY: Channel has been initialized by server. */ enum channel_serverstate { CHANNELSRV_UNINITIALIZED = 0, CHANNELSRV_READY = 1 }; /* * enum channel_clientstate * @CHANNELCLI_DETACHED: * @CHANNELCLI_DISABLED: Client can see channel but is NOT allowed to use it * unless given TBD* explicit request * (should actually be < DETACHED). * @CHANNELCLI_ATTACHING: Legacy EFI client request for EFI server to attach. * @CHANNELCLI_ATTACHED: Idle, but client may want to use channel any time. * @CHANNELCLI_BUSY: Client either wants to use or is using channel. * @CHANNELCLI_OWNED: "No worries" state - client can access channel * anytime. */ enum channel_clientstate { CHANNELCLI_DETACHED = 0, CHANNELCLI_DISABLED = 1, CHANNELCLI_ATTACHING = 2, CHANNELCLI_ATTACHED = 3, CHANNELCLI_BUSY = 4, CHANNELCLI_OWNED = 5 }; /* * Values for VISOR_CHANNEL_PROTOCOL.Features: This define exists so that * a guest can look at the FeatureFlags in the io channel, and configure the * driver to use interrupts or not based on this setting. All feature bits for * all channels should be defined here. The io channel feature bits are defined * below. */ #define VISOR_DRIVER_ENABLES_INTS (0x1ULL << 1) #define VISOR_CHANNEL_IS_POLLING (0x1ULL << 3) #define VISOR_IOVM_OK_DRIVER_DISABLING_INTS (0x1ULL << 4) #define VISOR_DRIVER_DISABLES_INTS (0x1ULL << 5) #define VISOR_DRIVER_ENHANCED_RCVBUF_CHECKING (0x1ULL << 6) /* * struct channel_header - Common Channel Header * @signature: Signature. * @legacy_state: DEPRECATED - being replaced by. * @header_size: sizeof(struct channel_header). * @size: Total size of this channel in bytes. * @features: Flags to modify behavior. * @chtype: Channel type: data, bus, control, etc.. * @partition_handle: ID of guest partition. * @handle: Device number of this channel in client. * @ch_space_offset: Offset in bytes to channel specific area. * @version_id: Struct channel_header Version ID. * @partition_index: Index of guest partition. * @zone_uuid: Guid of Channel's zone. * @cli_str_offset: Offset from channel header to null-terminated * ClientString (0 if ClientString not present). * @cli_state_boot: CHANNEL_CLIENTSTATE of pre-boot EFI client of this * channel. * @cmd_state_cli: CHANNEL_COMMANDSTATE (overloaded in Windows drivers, see * ServerStateUp, ServerStateDown, etc). * @cli_state_os: CHANNEL_CLIENTSTATE of Guest OS client of this channel. * @ch_characteristic: CHANNEL_CHARACTERISTIC_<xxx>. * @cmd_state_srv: CHANNEL_COMMANDSTATE (overloaded in Windows drivers, see * ServerStateUp, ServerStateDown, etc). * @srv_state: CHANNEL_SERVERSTATE. * @cli_error_boot: Bits to indicate err states for boot clients, so err * messages can be throttled. * @cli_error_os: Bits to indicate err states for OS clients, so err * messages can be throttled. * @filler: Pad out to 128 byte cacheline. * @recover_channel: Please add all new single-byte values below here. */ struct channel_header { u64 signature; u32 legacy_state; /* SrvState, CliStateBoot, and CliStateOS below */ u32 header_size; u64 size; u64 features; guid_t chtype; u64 partition_handle; u64 handle; u64 ch_space_offset; u32 version_id; u32 partition_index; guid_t zone_guid; u32 cli_str_offset; u32 cli_state_boot; u32 cmd_state_cli; u32 cli_state_os; u32 ch_characteristic; u32 cmd_state_srv; u32 srv_state; u8 cli_error_boot; u8 cli_error_os; u8 filler[1]; u8 recover_channel; } __packed; #define VISOR_CHANNEL_ENABLE_INTS (0x1ULL << 0) /* * struct signal_queue_header - Subheader for the Signal Type variation of the * Common Channel. * @version: SIGNAL_QUEUE_HEADER Version ID. * @chtype: Queue type: storage, network. * @size: Total size of this queue in bytes. * @sig_base_offset: Offset to signal queue area. * @features: Flags to modify behavior. * @num_sent: Total # of signals placed in this queue. * @num_overflows: Total # of inserts failed due to full queue. * @signal_size: Total size of a signal for this queue. * @max_slots: Max # of slots in queue, 1 slot is always empty. * @max_signals: Max # of signals in queue (MaxSignalSlots-1). * @head: Queue head signal #. * @num_received: Total # of signals removed from this queue. * @tail: Queue tail signal. * @reserved1: Reserved field. * @reserved2: Reserved field. * @client_queue: * @num_irq_received: Total # of Interrupts received. This is incremented by the * ISR in the guest windows driver. * @num_empty: Number of times that visor_signal_remove is called and * returned Empty Status. * @errorflags: Error bits set during SignalReinit to denote trouble with * client's fields. * @filler: Pad out to 64 byte cacheline. */ struct signal_queue_header { /* 1st cache line */ u32 version; u32 chtype; u64 size; u64 sig_base_offset; u64 features; u64 num_sent; u64 num_overflows; u32 signal_size; u32 max_slots; u32 max_signals; u32 head; /* 2nd cache line */ u64 num_received; u32 tail; u32 reserved1; u64 reserved2; u64 client_queue; u64 num_irq_received; u64 num_empty; u32 errorflags; u8 filler[12]; } __packed; /* VISORCHANNEL Guids */ /* {414815ed-c58c-11da-95a9-00e08161165f} */ #define VISOR_VHBA_CHANNEL_GUID \ GUID_INIT(0x414815ed, 0xc58c, 0x11da, \ 0x95, 0xa9, 0x0, 0xe0, 0x81, 0x61, 0x16, 0x5f) #define VISOR_VHBA_CHANNEL_GUID_STR \ "414815ed-c58c-11da-95a9-00e08161165f" struct visorchipset_state { u32 created:1; u32 attached:1; u32 configured:1; u32 running:1; /* Remaining bits in this 32-bit word are reserved. */ }; /** * struct visor_device - A device type for things "plugged" into the visorbus * bus * @visorchannel: Points to the channel that the device is * associated with. * @channel_type_guid: Identifies the channel type to the bus driver. * @device: Device struct meant for use by the bus driver * only. * @list_all: Used by the bus driver to enumerate devices. * @timer: Timer fired periodically to do interrupt-type * activity. * @being_removed: Indicates that the device is being removed from * the bus. Private bus driver use only. * @visordriver_callback_lock: Used by the bus driver to lock when adding and * removing devices. * @pausing: Indicates that a change towards a paused state. * is in progress. Only modified by the bus driver. * @resuming: Indicates that a change towards a running state * is in progress. Only modified by the bus driver. * @chipset_bus_no: Private field used by the bus driver. * @chipset_dev_no: Private field used the bus driver. * @state: Used to indicate the current state of the * device. * @inst: Unique GUID for this instance of the device. * @name: Name of the device. * @pending_msg_hdr: For private use by bus driver to respond to * hypervisor requests. * @vbus_hdr_info: A pointer to header info. Private use by bus * driver. * @partition_guid: Indicates client partion id. This should be the * same across all visor_devices in the current * guest. Private use by bus driver only. */ struct visor_device { struct visorchannel *visorchannel; guid_t channel_type_guid; /* These fields are for private use by the bus driver only. */ struct device device; struct list_head list_all; struct timer_list timer; bool timer_active; bool being_removed; struct mutex visordriver_callback_lock; /* synchronize probe/remove */ bool pausing; bool resuming; u32 chipset_bus_no; u32 chipset_dev_no; struct visorchipset_state state; guid_t inst; u8 *name; struct controlvm_message_header *pending_msg_hdr; void *vbus_hdr_info; guid_t partition_guid; struct dentry *debugfs_dir; struct dentry *debugfs_bus_info; }; #define to_visor_device(x) container_of(x, struct visor_device, device) typedef void (*visorbus_state_complete_func) (struct visor_device *dev, int status); /* * This struct describes a specific visor channel, by providing its GUID, name, * and sizes. */ struct visor_channeltype_descriptor { const guid_t guid; const char *name; u64 min_bytes; u32 version; }; /** * struct visor_driver - Information provided by each visor driver when it * registers with the visorbus driver * @name: Name of the visor driver. * @owner: The module owner. * @channel_types: Types of channels handled by this driver, ending with * a zero GUID. Our specialized BUS.match() method knows * about this list, and uses it to determine whether this * driver will in fact handle a new device that it has * detected. * @probe: Called when a new device comes online, by our probe() * function specified by driver.probe() (triggered * ultimately by some call to driver_register(), * bus_add_driver(), or driver_attach()). * @remove: Called when a new device is removed, by our remove() * function specified by driver.remove() (triggered * ultimately by some call to device_release_driver()). * @channel_interrupt: Called periodically, whenever there is a possiblity * that "something interesting" may have happened to the * channel. * @pause: Called to initiate a change of the device's state. If * the return valu`e is < 0, there was an error and the * state transition will NOT occur. If the return value * is >= 0, then the state transition was INITIATED * successfully, and complete_func() will be called (or * was just called) with the final status when either the * state transition fails or completes successfully. * @resume: Behaves similar to pause. * @driver: Private reference to the device driver. For use by bus * driver only. */ struct visor_driver { const char *name; struct module *owner; struct visor_channeltype_descriptor *channel_types; int (*probe)(struct visor_device *dev); void (*remove)(struct visor_device *dev); void (*channel_interrupt)(struct visor_device *dev); int (*pause)(struct visor_device *dev, visorbus_state_complete_func complete_func); int (*resume)(struct visor_device *dev, visorbus_state_complete_func complete_func); /* These fields are for private use by the bus driver only. */ struct device_driver driver; }; #define to_visor_driver(x) (container_of(x, struct visor_driver, driver)) int visor_check_channel(struct channel_header *ch, struct device *dev, const guid_t *expected_uuid, char *chname, u64 expected_min_bytes, u32 expected_version, u64 expected_signature); int visorbus_register_visor_driver(struct visor_driver *drv); void visorbus_unregister_visor_driver(struct visor_driver *drv); int visorbus_read_channel(struct visor_device *dev, unsigned long offset, void *dest, unsigned long nbytes); int visorbus_write_channel(struct visor_device *dev, unsigned long offset, void *src, unsigned long nbytes); int visorbus_enable_channel_interrupts(struct visor_device *dev); void visorbus_disable_channel_interrupts(struct visor_device *dev); int visorchannel_signalremove(struct visorchannel *channel, u32 queue, void *msg); int visorchannel_signalinsert(struct visorchannel *channel, u32 queue, void *msg); bool visorchannel_signalempty(struct visorchannel *channel, u32 queue); const guid_t *visorchannel_get_guid(struct visorchannel *channel); #define BUS_ROOT_DEVICE UINT_MAX struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no, struct visor_device *from); #endif