firewire: Document userspace ioctl interface.
The isochronous packet format is still not documented, but this is a good first step. Signed-off-by: Kristian Høgsberg <krh@redhat.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (format, wording)
This commit is contained in:
Kristian Høgsberg
Stefan Richter
Родитель
5cd54c94b0
Коммит
7ada60e367
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@ -30,16 +30,38 @@
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#define FW_CDEV_EVENT_REQUEST 0x02
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#define FW_CDEV_EVENT_ISO_INTERRUPT 0x03
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/* The 'closure' fields are for user space to use. Data passed in the
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* 'closure' field for a request will be returned in the corresponding
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* event. It's a 64-bit type so that it's a fixed size type big
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* enough to hold a pointer on all platforms. */
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/**
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* struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
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* @closure: For arbitrary use by userspace
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* @type: Discriminates the fw_cdev_event_ types
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*
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* This struct may be used to access generic members of all fw_cdev_event_
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* types regardless of the specific type.
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*
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* Data passed in the @closure field for a request will be returned in the
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* corresponding event. It is big enough to hold a pointer on all platforms.
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* The ioctl used to set @closure depends on the @type of event.
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*/
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struct fw_cdev_event_common {
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__u64 closure;
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__u32 type;
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};
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/**
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* struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
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* @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
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* @node_id: New node ID of this node
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* @local_node_id: Node ID of the local node, i.e. of the controller
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* @bm_node_id: Node ID of the bus manager
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* @irm_node_id: Node ID of the iso resource manager
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* @root_node_id: Node ID of the root node
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* @generation: New bus generation
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*
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* This event is sent when the bus the device belongs to goes through a bus
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* reset. It provides information about the new bus configuration, such as
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* new node ID for this device, new root ID, and others.
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*/
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struct fw_cdev_event_bus_reset {
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__u64 closure;
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__u32 type;
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@ -51,6 +73,20 @@ struct fw_cdev_event_bus_reset {
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__u32 generation;
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};
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/**
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* struct fw_cdev_event_response - Sent when a response packet was received
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* @closure: See &fw_cdev_event_common;
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* set by %FW_CDEV_IOC_SEND_REQUEST ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
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* @rcode: Response code returned by the remote node
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* @length: Data length, i.e. the response's payload size in bytes
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* @data: Payload data, if any
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*
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* This event is sent when the stack receives a response to an outgoing request
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* sent by %FW_CDEV_IOC_SEND_REQUEST ioctl. The payload data for responses
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* carrying data (read and lock responses) follows immediately and can be
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* accessed through the @data field.
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*/
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struct fw_cdev_event_response {
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__u64 closure;
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__u32 type;
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@ -59,6 +95,25 @@ struct fw_cdev_event_response {
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__u32 data[0];
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};
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/**
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* struct fw_cdev_event_request - Sent on incoming request to an address region
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* @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
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* @tcode: Transaction code of the incoming request
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* @offset: The offset into the 48-bit per-node address space
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* @handle: Reference to the kernel-side pending request
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* @length: Data length, i.e. the request's payload size in bytes
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* @data: Incoming data, if any
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*
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* This event is sent when the stack receives an incoming request to an address
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* region registered using the %FW_CDEV_IOC_ALLOCATE ioctl. The request is
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* guaranteed to be completely contained in the specified region. Userspace is
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* responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
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* using the same @handle.
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*
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* The payload data for requests carrying data (write and lock requests)
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* follows immediately and can be accessed through the @data field.
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*/
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struct fw_cdev_event_request {
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__u64 closure;
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__u32 type;
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@ -69,14 +124,39 @@ struct fw_cdev_event_request {
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__u32 data[0];
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};
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/**
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* struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
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* @closure: See &fw_cdev_event_common;
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* set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
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* @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
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* @cycle: Cycle counter of the interrupt packet
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* @header_length: Total length of following headers, in bytes
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* @header: Stripped headers, if any
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*
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* This event is sent when the controller has completed an &fw_cdev_iso_packet
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* with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers
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* stripped of all packets up until and including the interrupt packet are
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* returned in the @header field.
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*/
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struct fw_cdev_event_iso_interrupt {
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__u64 closure;
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__u32 type;
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__u32 cycle;
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__u32 header_length; /* Length in bytes of following headers. */
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__u32 header_length;
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__u32 header[0];
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};
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/**
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* union fw_cdev_event - Convenience union of fw_cdev_event_ types
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* @common: Valid for all types
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* @bus_reset: Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
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* @response: Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
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* @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
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* @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
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*
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* Convenience union for userspace use. Events could be read(2) into a char
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* buffer and then cast to this union for further processing.
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*/
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union fw_cdev_event {
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struct fw_cdev_event_common common;
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struct fw_cdev_event_bus_reset bus_reset;
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@ -105,35 +185,47 @@ union fw_cdev_event {
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*/
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#define FW_CDEV_VERSION 1
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/**
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* struct fw_cdev_get_info - General purpose information ioctl
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* @version: The version field is just a running serial number.
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* We never break backwards compatibility, but may add more
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* structs and ioctls in later revisions.
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* @rom_length: If @rom is non-zero, at most rom_length bytes of configuration
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* ROM will be copied into that user space address. In either
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* case, @rom_length is updated with the actual length of the
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* configuration ROM.
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* @rom: If non-zero, address of a buffer to be filled by a copy of the
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* local node's configuration ROM
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* @bus_reset: If non-zero, address of a buffer to be filled by a
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* &struct fw_cdev_event_bus_reset with the current state
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* of the bus. This does not cause a bus reset to happen.
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* @bus_reset_closure: Value of &closure in this and subsequent bus reset events
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* @card: The index of the card this device belongs to
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*/
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struct fw_cdev_get_info {
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/* The version field is just a running serial number. We
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* never break backwards compatibility. Userspace passes in
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* the version it expects and the kernel passes back the
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* highest version it can provide. Even if the structs in
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* this interface are extended in a later version, the kernel
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* will not copy back more data than what was present in the
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* interface version userspace expects. */
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__u32 version;
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/* If non-zero, at most rom_length bytes of config rom will be
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* copied into that user space address. In either case,
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* rom_length is updated with the actual length of the config
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* rom. */
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__u32 rom_length;
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__u64 rom;
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/* If non-zero, a fw_cdev_event_bus_reset struct will be
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* copied here with the current state of the bus. This does
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* not cause a bus reset to happen. The value of closure in
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* this and sub-sequent bus reset events is set to
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* bus_reset_closure. */
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__u64 bus_reset;
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__u64 bus_reset_closure;
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/* The index of the card this devices belongs to. */
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__u32 card;
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};
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/**
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* struct fw_cdev_send_request - Send an asynchronous request packet
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* @tcode: Transaction code of the request
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* @length: Length of outgoing payload, in bytes
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* @offset: 48-bit offset at destination node
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* @closure: Passed back to userspace in the response event
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* @data: Userspace pointer to payload
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* @generation: The bus generation where packet is valid
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*
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* Send a request to the device. This ioctl implements all outgoing requests.
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* Both quadlet and block request specify the payload as a pointer to the data
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* in the @data field. Once the transaction completes, the kernel writes an
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* &fw_cdev_event_request event back. The @closure field is passed back to
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* user space in the response event.
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*/
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struct fw_cdev_send_request {
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__u32 tcode;
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__u32 length;
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@ -143,6 +235,19 @@ struct fw_cdev_send_request {
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__u32 generation;
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};
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/**
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* struct fw_cdev_send_response - Send an asynchronous response packet
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* @rcode: Response code as determined by the userspace handler
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* @length: Length of outgoing payload, in bytes
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* @data: Userspace pointer to payload
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* @handle: The handle from the &fw_cdev_event_request
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*
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* Send a response to an incoming request. By setting up an address range using
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* the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests. An
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* incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
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* send a reply using this ioctl. The event has a handle to the kernel-side
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* pending transaction, which should be used with this ioctl.
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*/
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struct fw_cdev_send_response {
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__u32 rcode;
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__u32 length;
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@ -150,6 +255,21 @@ struct fw_cdev_send_response {
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__u32 handle;
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};
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/**
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* struct fw_cdev_allocate - Allocate a CSR address range
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* @offset: Start offset of the address range
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* @closure: To be passed back to userspace in request events
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* @length: Length of the address range, in bytes
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* @handle: Handle to the allocation, written by the kernel
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*
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* Allocate an address range in the 48-bit address space on the local node
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* (the controller). This allows userspace to listen for requests with an
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* offset within that address range. When the kernel receives a request
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* within the range, an &fw_cdev_event_request event will be written back.
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* The @closure field is passed back to userspace in the response event.
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* The @handle field is an out parameter, returning a handle to the allocated
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* range to be used for later deallocation of the range.
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*/
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struct fw_cdev_allocate {
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__u64 offset;
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__u64 closure;
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@ -157,6 +277,11 @@ struct fw_cdev_allocate {
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__u32 handle;
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};
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/**
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* struct fw_cdev_deallocate - Free an address range allocation
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* @handle: Handle to the address range, as returned by the kernel when the
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* range was allocated
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*/
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struct fw_cdev_deallocate {
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__u32 handle;
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};
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@ -164,10 +289,41 @@ struct fw_cdev_deallocate {
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#define FW_CDEV_LONG_RESET 0
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#define FW_CDEV_SHORT_RESET 1
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/**
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* struct fw_cdev_initiate_bus_reset - Initiate a bus reset
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* @type: %FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
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*
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* Initiate a bus reset for the bus this device is on. The bus reset can be
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* either the original (long) bus reset or the arbitrated (short) bus reset
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* introduced in 1394a-2000.
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*/
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struct fw_cdev_initiate_bus_reset {
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__u32 type;
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__u32 type; /* FW_CDEV_SHORT_RESET or FW_CDEV_LONG_RESET */
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};
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/**
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* struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
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* @immediate: If non-zero, immediate key to insert before pointer
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* @key: Upper 8 bits of root directory pointer
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* @data: Userspace pointer to contents of descriptor block
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* @length: Length of descriptor block data, in bytes
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* @handle: Handle to the descriptor, written by the kernel
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*
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* Add a descriptor block and optionally a preceding immediate key to the local
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* node's configuration ROM.
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*
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* The @key field specifies the upper 8 bits of the descriptor root directory
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* pointer and the @data and @length fields specify the contents. The @key
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* should be of the form 0xXX000000. The offset part of the root directory entry
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* will be filled in by the kernel.
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*
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* If not 0, the @immediate field specifies an immediate key which will be
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* inserted before the root directory pointer.
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*
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* If successful, the kernel adds the descriptor and writes back a handle to the
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* kernel-side object to be used for later removal of the descriptor block and
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* immediate key.
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*/
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struct fw_cdev_add_descriptor {
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__u32 immediate;
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__u32 key;
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@ -176,6 +332,14 @@ struct fw_cdev_add_descriptor {
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__u32 handle;
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};
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/**
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* struct fw_cdev_remove_descriptor - Remove contents from the configuration ROM
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* @handle: Handle to the descriptor, as returned by the kernel when the
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* descriptor was added
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*
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* Remove a descriptor block and accompanying immediate key from the local
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* node's configuration ROM.
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*/
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struct fw_cdev_remove_descriptor {
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__u32 handle;
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};
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@ -183,12 +347,24 @@ struct fw_cdev_remove_descriptor {
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#define FW_CDEV_ISO_CONTEXT_TRANSMIT 0
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#define FW_CDEV_ISO_CONTEXT_RECEIVE 1
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#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
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#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
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#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
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#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
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#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
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/**
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* struct fw_cdev_create_iso_context - Create a context for isochronous IO
|
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* @type: %FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE
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* @header_size: Header size to strip for receive contexts
|
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* @channel: Channel to bind to
|
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* @speed: Speed to transmit at
|
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* @closure: To be returned in &fw_cdev_event_iso_interrupt
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* @handle: Handle to context, written back by kernel
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*
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* Prior to sending or receiving isochronous I/O, a context must be created.
|
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* The context records information about the transmit or receive configuration
|
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* and typically maps to an underlying hardware resource. A context is set up
|
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* for either sending or receiving. It is bound to a specific isochronous
|
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* channel.
|
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*
|
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* If a context was successfully created, the kernel writes back a handle to the
|
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* context, which must be passed in for subsequent operations on that context.
|
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*/
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struct fw_cdev_create_iso_context {
|
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__u32 type;
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__u32 header_size;
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@ -201,15 +377,49 @@ struct fw_cdev_create_iso_context {
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#define FW_CDEV_ISO_PAYLOAD_LENGTH(v) (v)
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#define FW_CDEV_ISO_INTERRUPT (1 << 16)
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#define FW_CDEV_ISO_SKIP (1 << 17)
|
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#define FW_CDEV_ISO_SYNC (1 << 17)
|
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#define FW_CDEV_ISO_TAG(v) ((v) << 18)
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#define FW_CDEV_ISO_SY(v) ((v) << 20)
|
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#define FW_CDEV_ISO_HEADER_LENGTH(v) ((v) << 24)
|
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|
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/**
|
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* struct fw_cdev_iso_packet - Isochronous packet
|
||||
* @control: Contains the header length (8 uppermost bits), the sy field
|
||||
* (4 bits), the tag field (2 bits), a sync flag (1 bit),
|
||||
* a skip flag (1 bit), an interrupt flag (1 bit), and the
|
||||
* payload length (16 lowermost bits)
|
||||
* @header: Header and payload
|
||||
*
|
||||
* &struct fw_cdev_iso_packet is used to describe isochronous packet queues.
|
||||
*
|
||||
* Use the FW_CDEV_ISO_ macros to fill in @control. The sy and tag fields are
|
||||
* specified by IEEE 1394a and IEC 61883.
|
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*
|
||||
* FIXME - finish this documentation
|
||||
*/
|
||||
struct fw_cdev_iso_packet {
|
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__u32 control;
|
||||
__u32 header[0];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct fw_cdev_queue_iso - Queue isochronous packets for I/O
|
||||
* @packets: Userspace pointer to packet data
|
||||
* @data: Pointer into mmap()'ed payload buffer
|
||||
* @size: Size of packet data in bytes
|
||||
* @handle: Isochronous context handle
|
||||
*
|
||||
* Queue a number of isochronous packets for reception or transmission.
|
||||
* This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
|
||||
* which describe how to transmit from or receive into a contiguous region
|
||||
* of a mmap()'ed payload buffer. As part of the packet descriptors,
|
||||
* a series of headers can be supplied, which will be prepended to the
|
||||
* payload during DMA.
|
||||
*
|
||||
* The kernel may or may not queue all packets, but will write back updated
|
||||
* values of the @packets, @data and @size fields, so the ioctl can be
|
||||
* resubmitted easily.
|
||||
*/
|
||||
struct fw_cdev_queue_iso {
|
||||
__u64 packets;
|
||||
__u64 data;
|
||||
|
|
@ -217,6 +427,23 @@ struct fw_cdev_queue_iso {
|
|||
__u32 handle;
|
||||
};
|
||||
|
||||
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
|
||||
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
|
||||
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
|
||||
#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
|
||||
#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
|
||||
|
||||
/**
|
||||
* struct fw_cdev_start_iso - Start an isochronous transmission or reception
|
||||
* @cycle: Cycle in which to start I/O. If @cycle is greater than or
|
||||
* equal to 0, the I/O will start on that cycle.
|
||||
* @sync: Determines the value to wait for for receive packets that have
|
||||
* the %FW_CDEV_ISO_SYNC bit set
|
||||
* @tags: Tag filter bit mask. Only valid for isochronous reception.
|
||||
* Determines the tag values for which packets will be accepted.
|
||||
* Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
|
||||
* @handle: Isochronous context handle within which to transmit or receive
|
||||
*/
|
||||
struct fw_cdev_start_iso {
|
||||
__s32 cycle;
|
||||
__u32 sync;
|
||||
|
|
@ -224,6 +451,10 @@ struct fw_cdev_start_iso {
|
|||
__u32 handle;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
|
||||
* @handle: Handle of isochronous context to stop
|
||||
*/
|
||||
struct fw_cdev_stop_iso {
|
||||
__u32 handle;
|
||||
};
|
||||
|
|
|
|||
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