mirror of https://gitee.com/openkylin/linux.git
irq: DocBook/genericirq.tmpl: Correct various typos
Typo corrections for DocBook/genericirq.tmpl. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Link: http://lkml.kernel.org/r/5261D400.30400@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Randy Dunlap
Ingo Molnar
parent
04919afb85
commit
fd2f3b7ee1
|
|
@ -87,7 +87,7 @@
|
|||
<chapter id="rationale">
|
||||
<title>Rationale</title>
|
||||
<para>
|
||||
The original implementation of interrupt handling in Linux is using
|
||||
The original implementation of interrupt handling in Linux uses
|
||||
the __do_IRQ() super-handler, which is able to deal with every
|
||||
type of interrupt logic.
|
||||
</para>
|
||||
|
|
@ -111,19 +111,19 @@
|
|||
</itemizedlist>
|
||||
</para>
|
||||
<para>
|
||||
This split implementation of highlevel IRQ handlers allows us to
|
||||
This split implementation of high-level IRQ handlers allows us to
|
||||
optimize the flow of the interrupt handling for each specific
|
||||
interrupt type. This reduces complexity in that particular codepath
|
||||
interrupt type. This reduces complexity in that particular code path
|
||||
and allows the optimized handling of a given type.
|
||||
</para>
|
||||
<para>
|
||||
The original general IRQ implementation used hw_interrupt_type
|
||||
structures and their ->ack(), ->end() [etc.] callbacks to
|
||||
differentiate the flow control in the super-handler. This leads to
|
||||
a mix of flow logic and lowlevel hardware logic, and it also leads
|
||||
to unnecessary code duplication: for example in i386, there is a
|
||||
ioapic_level_irq and a ioapic_edge_irq irq-type which share many
|
||||
of the lowlevel details but have different flow handling.
|
||||
a mix of flow logic and low-level hardware logic, and it also leads
|
||||
to unnecessary code duplication: for example in i386, there is an
|
||||
ioapic_level_irq and an ioapic_edge_irq IRQ-type which share many
|
||||
of the low-level details but have different flow handling.
|
||||
</para>
|
||||
<para>
|
||||
A more natural abstraction is the clean separation of the
|
||||
|
|
@ -132,23 +132,23 @@
|
|||
<para>
|
||||
Analysing a couple of architecture's IRQ subsystem implementations
|
||||
reveals that most of them can use a generic set of 'irq flow'
|
||||
methods and only need to add the chip level specific code.
|
||||
methods and only need to add the chip-level specific code.
|
||||
The separation is also valuable for (sub)architectures
|
||||
which need specific quirks in the irq flow itself but not in the
|
||||
chip-details - and thus provides a more transparent IRQ subsystem
|
||||
which need specific quirks in the IRQ flow itself but not in the
|
||||
chip details - and thus provides a more transparent IRQ subsystem
|
||||
design.
|
||||
</para>
|
||||
<para>
|
||||
Each interrupt descriptor is assigned its own highlevel flow
|
||||
Each interrupt descriptor is assigned its own high-level flow
|
||||
handler, which is normally one of the generic
|
||||
implementations. (This highlevel flow handler implementation also
|
||||
implementations. (This high-level flow handler implementation also
|
||||
makes it simple to provide demultiplexing handlers which can be
|
||||
found in embedded platforms on various architectures.)
|
||||
</para>
|
||||
<para>
|
||||
The separation makes the generic interrupt handling layer more
|
||||
flexible and extensible. For example, an (sub)architecture can
|
||||
use a generic irq-flow implementation for 'level type' interrupts
|
||||
use a generic IRQ-flow implementation for 'level type' interrupts
|
||||
and add a (sub)architecture specific 'edge type' implementation.
|
||||
</para>
|
||||
<para>
|
||||
|
|
@ -172,9 +172,9 @@
|
|||
<para>
|
||||
There are three main levels of abstraction in the interrupt code:
|
||||
<orderedlist>
|
||||
<listitem><para>Highlevel driver API</para></listitem>
|
||||
<listitem><para>Highlevel IRQ flow handlers</para></listitem>
|
||||
<listitem><para>Chiplevel hardware encapsulation</para></listitem>
|
||||
<listitem><para>High-level driver API</para></listitem>
|
||||
<listitem><para>High-level IRQ flow handlers</para></listitem>
|
||||
<listitem><para>Chip-level hardware encapsulation</para></listitem>
|
||||
</orderedlist>
|
||||
</para>
|
||||
<sect1 id="Interrupt_control_flow">
|
||||
|
|
@ -189,16 +189,16 @@
|
|||
which are assigned to this interrupt.
|
||||
</para>
|
||||
<para>
|
||||
Whenever an interrupt triggers, the lowlevel arch code calls into
|
||||
the generic interrupt code by calling desc->handle_irq().
|
||||
This highlevel IRQ handling function only uses desc->irq_data.chip
|
||||
Whenever an interrupt triggers, the low-level architecture code calls
|
||||
into the generic interrupt code by calling desc->handle_irq().
|
||||
This high-level IRQ handling function only uses desc->irq_data.chip
|
||||
primitives referenced by the assigned chip descriptor structure.
|
||||
</para>
|
||||
</sect1>
|
||||
<sect1 id="Highlevel_Driver_API">
|
||||
<title>Highlevel Driver API</title>
|
||||
<title>High-level Driver API</title>
|
||||
<para>
|
||||
The highlevel Driver API consists of following functions:
|
||||
The high-level Driver API consists of following functions:
|
||||
<itemizedlist>
|
||||
<listitem><para>request_irq()</para></listitem>
|
||||
<listitem><para>free_irq()</para></listitem>
|
||||
|
|
@ -216,7 +216,7 @@
|
|||
</para>
|
||||
</sect1>
|
||||
<sect1 id="Highlevel_IRQ_flow_handlers">
|
||||
<title>Highlevel IRQ flow handlers</title>
|
||||
<title>High-level IRQ flow handlers</title>
|
||||
<para>
|
||||
The generic layer provides a set of pre-defined irq-flow methods:
|
||||
<itemizedlist>
|
||||
|
|
@ -228,7 +228,7 @@
|
|||
<listitem><para>handle_edge_eoi_irq</para></listitem>
|
||||
<listitem><para>handle_bad_irq</para></listitem>
|
||||
</itemizedlist>
|
||||
The interrupt flow handlers (either predefined or architecture
|
||||
The interrupt flow handlers (either pre-defined or architecture
|
||||
specific) are assigned to specific interrupts by the architecture
|
||||
either during bootup or during device initialization.
|
||||
</para>
|
||||
|
|
@ -297,7 +297,7 @@ desc->irq_data.chip->irq_unmask();
|
|||
<para>
|
||||
handle_fasteoi_irq provides a generic implementation
|
||||
for interrupts, which only need an EOI at the end of
|
||||
the handler
|
||||
the handler.
|
||||
</para>
|
||||
<para>
|
||||
The following control flow is implemented (simplified excerpt):
|
||||
|
|
@ -394,7 +394,7 @@ if (desc->irq_data.chip->irq_eoi)
|
|||
The generic functions are intended for 'clean' architectures and chips,
|
||||
which have no platform-specific IRQ handling quirks. If an architecture
|
||||
needs to implement quirks on the 'flow' level then it can do so by
|
||||
overriding the highlevel irq-flow handler.
|
||||
overriding the high-level irq-flow handler.
|
||||
</para>
|
||||
</sect2>
|
||||
<sect2 id="Delayed_interrupt_disable">
|
||||
|
|
@ -419,9 +419,9 @@ if (desc->irq_data.chip->irq_eoi)
|
|||
</sect2>
|
||||
</sect1>
|
||||
<sect1 id="Chiplevel_hardware_encapsulation">
|
||||
<title>Chiplevel hardware encapsulation</title>
|
||||
<title>Chip-level hardware encapsulation</title>
|
||||
<para>
|
||||
The chip level hardware descriptor structure irq_chip
|
||||
The chip-level hardware descriptor structure irq_chip
|
||||
contains all the direct chip relevant functions, which
|
||||
can be utilized by the irq flow implementations.
|
||||
<itemizedlist>
|
||||
|
|
@ -429,14 +429,14 @@ if (desc->irq_data.chip->irq_eoi)
|
|||
<listitem><para>irq_mask_ack() - Optional, recommended for performance</para></listitem>
|
||||
<listitem><para>irq_mask()</para></listitem>
|
||||
<listitem><para>irq_unmask()</para></listitem>
|
||||
<listitem><para>irq_eoi() - Optional, required for eoi flow handlers</para></listitem>
|
||||
<listitem><para>irq_eoi() - Optional, required for EOI flow handlers</para></listitem>
|
||||
<listitem><para>irq_retrigger() - Optional</para></listitem>
|
||||
<listitem><para>irq_set_type() - Optional</para></listitem>
|
||||
<listitem><para>irq_set_wake() - Optional</para></listitem>
|
||||
</itemizedlist>
|
||||
These primitives are strictly intended to mean what they say: ack means
|
||||
ACK, masking means masking of an IRQ line, etc. It is up to the flow
|
||||
handler(s) to use these basic units of lowlevel functionality.
|
||||
handler(s) to use these basic units of low-level functionality.
|
||||
</para>
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
|
@ -445,7 +445,7 @@ if (desc->irq_data.chip->irq_eoi)
|
|||
<title>__do_IRQ entry point</title>
|
||||
<para>
|
||||
The original implementation __do_IRQ() was an alternative entry
|
||||
point for all types of interrupts. It not longer exists.
|
||||
point for all types of interrupts. It no longer exists.
|
||||
</para>
|
||||
<para>
|
||||
This handler turned out to be not suitable for all
|
||||
|
|
@ -468,11 +468,11 @@ if (desc->irq_data.chip->irq_eoi)
|
|||
<chapter id="genericchip">
|
||||
<title>Generic interrupt chip</title>
|
||||
<para>
|
||||
To avoid copies of identical implementations of irq chips the
|
||||
To avoid copies of identical implementations of IRQ chips the
|
||||
core provides a configurable generic interrupt chip
|
||||
implementation. Developers should check carefuly whether the
|
||||
generic chip fits their needs before implementing the same
|
||||
functionality slightly different themself.
|
||||
functionality slightly differently themselves.
|
||||
</para>
|
||||
!Ekernel/irq/generic-chip.c
|
||||
</chapter>
|
||||
|
|
|
|||
Loading…
Reference in New Issue