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split INTRNG main file into two files #1285

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split INTRNG main file into two files #1285

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Commits on Nov 4, 2024

  1. intrng: split intr_describe_irq() 

    intr_describe_irq() was mixing two operations together.  There was the
mapping step and the underlying intr_event_describe_handler() call.
Split these two steps apart to match other portions of the interface.

Differential Revision: https://reviews.freebsd.org/D39333
    @ehem
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  2. intr/x86: purge ->is_handlers value 

    Use of the macro CK_SLIST_EMPTY() on ->is_event->ie_handlers readily
substitues for the value ->is_handlers.  While only minor shrinkage of
struct intsrc, small reductions do accumulate.

Update the i8254 hack to work with this setup.
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  3. x86/intr: match intr_add_handler() to other architectures 

    Making INTRNG's intr_add_handler() act similarly to x86's would be a
bit troublesome.  As such modify x86's functionality.  Currently INTRNG
uses a bit array to indicate processor restriction, so remove the
domain to allow matching.
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  4. intrng: expose lower-level device interface for INTRNG 

    Specialized peripheral PIC drivers may need to handle most interrupt
setup steps themselves without touching newbus.  Two cases are
intr_add_handler() and intr_describe() which are internally used by
`intr_setup_irq()`/`intr_describe_irq()`.  Exposing these allow for
alternative use case.

In fact the BUS interface for INTRNG is arguably a layering violation.
Those 6 functions could just as well be in nexus.c or a kernel library.

Differential Revision: https://reviews.freebsd.org/D39333
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  5. intrng: handle intr_describe() being passed NULL cookies 

    Handle the situation as a request to update the interrupt table name,
without updating the event name.
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  6. intrng: adjust intr_teardown_irq() to use intr_describe() 

    intr_teardown_irq() is PIC-level, while intrcnt_updatename() is
interrupt-level.  As such, intr_teardown_irq() should use the next layer
of function, instead of an interrupt-internal function.
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  7. intrng: split intr_isrc_assign_cpu() 

    intr_isrc_assign_cpu() failed to split the intr_event functionality
from the assignment functionality.  The actual assignment is a PIC-level
operation and as such should be separate.
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  8. intrng: switch PIC interface to use pic_list_lock 

    Using isrc_table_lock for these functions violates layering.  Instead
use pic_list_lock, which isn't quite proper, but matches the layer these
functions are located.
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  9. intrng: break PIC functionality off of main INTRNG file 

    This should serve to truly split things into layers.  Perhaps this could
then be used on x86 and serve to continue unifying interrupt frameworks.
    @ehem
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