arch.s390x.io.css.subchannel Module Reference

Data Structures
struct	arch::s390x::io::css::subchannel_entry
	Per-subchannel bookkeeping entry. More...

Enumerations
enum class	subchannel_state : u8 {   free = 0 , probing = 1 , idle = 2 , active = 3 ,   halting = 4 }
	Lifecycle state of a subchannel entry.

Typedefs
using	arch::s390x::io::css::io_completion_sink_fn
	Kernel I/O completion sink.

Functions
auto	arch::s390x::io::css::available_lpm (u32 sch_index) noexcept -> u8
	Return the hardware-available logical path mask for a binding.
auto	arch::s390x::io::css::claim_binding (u32 sch_index, u32 binding_id, u32 binding_generation) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Exclusively associate an active I/O binding with a subchannel.
auto	arch::s390x::io::css::clear_io (u32 sch_index) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Clear I/O on a subchannel (issue CSCH).
auto	arch::s390x::io::css::find_device (u16 dev_type, u16 dev_model) noexcept -> ::std::expected< u32, ::lib::kernel_error >
	Find a subchannel by SENSE-ID device type and model.
auto	arch::s390x::io::css::get_entry (u32 index) noexcept -> subchannel_entry *
	Return a pointer to a subchannel entry by index.
auto	arch::s390x::io::css::halt_io (u32 sch_index) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Halt I/O on a subchannel (issue HSCH).
auto	arch::s390x::io::css::init () noexcept -> void
	Probe all subchannels, enable valid ones, and populate the table.
auto	arch::s390x::io::css::install_completion_sink (io_completion_sink_fn sink) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Install the nucleus I/O completion sink.
auto	arch::s390x::io::css::io_interrupt (u32 sch_no) noexcept -> void
	Called from the I/O interrupt handler to drain status.
auto	operator= (const subchannel_entry &)=delete
auto	operator= (subchannel_entry &&)=delete
auto	arch::s390x::io::css::release_binding (u32 sch_index, u32 binding_id, u32 binding_generation) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Remove an exact subchannel-binding association after I/O fencing.
auto	arch::s390x::io::css::start_io (u32 sch_index, orb &orb_ref) noexcept -> ::std::expected< void, ::lib::kernel_error >
	Start I/O on a subchannel.
auto	arch::s390x::io::css::subchannel_count () noexcept -> u32
	Return the number of probed subchannels.
	subchannel_entry (const subchannel_entry &)=delete
	subchannel_entry (subchannel_entry &&)=delete
auto	arch::s390x::io::css::test_io (u32 sch_index, irb &irb_ref) noexcept -> ::std::expected< condition_code, ::lib::kernel_error >
	Test I/O on a subchannel (issue TSCH).

Variables
u8	_pad0 [1] {}
u32	active_binding_id {~0U}
u8	available_lpm {0}
u32	binding_generation {0}
u32	binding_id {~0U}
u16	devno {0xFFFF}
std::atomic< u32 >	io_done {0}
zxfoundation::sync::waitqueue::wait_head	io_wait {}
irb	last_irb {}
subchannel_id	schid {}
senseid_data	sense {}
subchannel_state	state {subchannel_state::free}

Files
file	arch/s390x/io/css.zcomponent/subchannel.cxxm
file	arch/s390x/io/css.zcomponent/subchannel.cxx