kern/intr: redeclare intr_setaffinity()'s third arg constant

This matches reality and allows removal of a __DECONST().

Fixes: 4c72d075a57 ("LinuxKPI: const argument to irq_set_affinity_hint()")
Fixes: 9b33b154b53 ("Add support to cpuset for binding hardware interrupts")
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1126

LinuxKPI: Remove sys/rman.h include from LKPI headers.

sys/rman.h defines `resource` structure which conflicts with the Linux
structure of the same name. To fix that remove reference to sys/rman.h
from linux/pci.h and move resource management code to linux_pci.c.
Update consumers which were depending on linux/pci.h pollution.

No functional changes intended.

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D42792

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

linuxkpi: Define `IRQ_NOTCONNECTED`

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38539

LinuxKPI: const argument to irq_set_affinity_hint()

irq_set_affinity_hint() takes a const mask argument and some drivers
pass it in as such where earlier implementations were more lenient.
Deal with it and __DECONST() the argument when passed to intr_setaffinity().

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D38242

LinuxKPI: interrupt.h: add disable_irq_nosync(), irq_set_status_flags()

Add a dummy irq_set_status_flags() along with #defines passed by the driver.
Add disable_irq_nosync() as another wrapper to lkpi_disable_irq().
Those are used by wireless drivers.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D38241

linuxkpi: Define `tasklet_unlock_spin_wait()` as `tasklet_unlock_wait()`

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38080

LinuxKPI: implement irq_get_msi_desc()

Add irq_get_msi_desc() as a wrapper around a PCI function which will
allocate a single cached value (see comment on struct) for the
msi_desc requested if it doesn't exist yet and handle freeing it
when the PCI device goes away. We take the values from the ivars of
the native (FreeBSD) device.

While changing struct pci_dev also add the msi_cap field requested by
a wireless driver.

Bump __FreeBSD_version so these changes can be detected.

MFC after: 3 days
X-MFC: move fields to end of struct (alloc happens in linux_pci.c)
Reviewed by: hselasky (earlier version)
Differential Revision: https://reviews.freebsd.org/D37523

LinuxKPI: tasklet add (*callback) support

In addition to (*func) tasklet also seems to have a (*callback) with
a different argument. Add support for this and add tasklet_setup()
as well for support in more drivers.

The from_tasklet() definition is duplicated in the tree; hide it there
under #ifndef to avoid a re-definition. People should generally add
LinuxKPI bits to linuxkpi rather than private files if they also rely
on other LinuxKPI bits.

X-MFC: DO NOT MFC, space allocated by drivers not us.
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D37216

LinuxKPI: add devm_request_irq()

Add devm_request_irq() needed by a driver. Turns out all we need
is a wrapper with the right arguments to lkpi_request_irq().

MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D37217

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

LinuxKPI: Hide some internal symbols in linux_interrupt.c

Reviewed by: hselasky, manu
Differential revision: https://reviews.freebsd.org/D32168

LinuxKPI: Remove FreeBSD struct resource from all LKPI headers

except linux/pci.h to avoid conflicts with Linux version.
This allows to #define resource in drm-kmod globally and strip some #ifdef-s

Reviewed by: hselasky, manu
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D31673

LinuxKPI: enhance the irq KPI for managed and threaded operations.

Move request_irq() to an internal function which serves request_irq()
and the newly added request_threaded_irq() and devm_request_threaded_irq().
Likewise factor out parts of free_irq() to also be used with
devm_free_irq(). Add the storage and call to a thread_handler in case
of IRQ_WAKE_THREAD.
This is needed for the iwlwifi driver.

Sponsored by: The FreeBSD Foundation
MFC after: 10 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30549

LinuxKPI: add irq_set_affinity_hint()

Add an implementation for irq_set_affinity_hint() to linux/interrupt.h
and include linux/hardirq.h for synchronize_irq() as needed by
wireless drivers.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30427

linuxkpi: Introduce tasklet_disable_nosync()

This is needed for the drm-kmod 5.5 update.

Reviewed by: hselasky (src)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D30024

Fix broken DECLARE_TASKLET() macro after r347852.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Implement pci_enable_msi() and pci_disable_msi() in the LinuxKPI.
This patch makes the DRM graphics driver in ports usable on aarch64.

Submitted by: Greg V <greg@unrelenting.technology>
Differential Revision: https://reviews.freebsd.org/D21008
MFC after: 1 week
Sponsored by: Mellanox Technologies

LinuxKPI: Updates to tasklets for Linux 5.0.

DRM drivers expect tasklets to have a counter for enable/disable calls.
Also, add a few more tasklet locking functions.

This patch is part of D19565

Reviewed by: hps
Approved by: imp (mentor), hps
MFC after: 1 week

Move the IRQ_RETVAL() and irqreturn definitions to irqreturn.h in the
LinuxKPI to be compatible with Linux. No functional change.

MFC after: 1 week
Submitted by: Johannes Lundberg <johalun0@gmail.com>
Sponsored by: Mellanox Technologies

Add checks for valid IRQ tag before setting up or tearing down an interrupt
handler in the LinuxKPI. This is needed when the interrupt handler is disabled
before freeing the interrupt.

MFC after: 1 week
Submitted by: Johannes Lundberg <johalun0@gmail.com>
Sponsored by: Mellanox Technologies

Implement tasklet_enable() and tasklet_disable() in the LinuxKPI.

MFC after: 1 week
Requested by: Johannes Lundberg <johalun0@gmail.com>
Sponsored by: Mellanox Technologies

Implement enable_irq() and disable_irq() in the LinuxKPI.

MFC after: 1 week
Submitted by: Johannes Lundberg <johalun0@gmail.com>
Sponsored by: Mellanox Technologies

Add support for LinuxKPI tasklets.

Tasklets are implemented using a taskqueue and a small statemachine on
top. The additional statemachine is required to ensure all LinuxKPI
tasklets get serialized. FreeBSD taskqueues do not guarantee
serialisation of its tasks, except when there is only one worker
thread configured.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Prefix some _pci_xxx() functions in the Linux KPI with linux_ and make
sure the IRQ number used by these functions is unsigned.

Sponsored by: Mellanox Technologies
MFC after: 1 week

LinuxKPI style changes:
- Properly prefix internal functions with "linux_" instead of only a
single underscore to avoid future namespace collisions.
- Make some functions global instead of inline to ease debugging and
to avoid unnecessary code duplication.
- Remove no longer existing kthread_create() function's prototype.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Make all the LinuxKPI include files compile standalone.

Sponsored by: Mellanox Technologies

Finish process of moving the LinuxKPI module into the default kernel build.

- Move all files related to the LinuxKPI into sys/compat/linuxkpi and
its subfolders.
- Update sys/conf/files and some Makefiles to use new file locations.
- Added description of COMPAT_LINUXKPI to sys/conf/NOTES which in turn
adds the LinuxKPI to all LINT builds.
- The LinuxKPI can be added to the kernel by setting the
COMPAT_LINUXKPI option. The OFED kernel option no longer builds the
LinuxKPI into the kernel. This was done to keep the build rules for
the LinuxKPI in sys/conf/files simple.
- Extend the LinuxKPI module to include support for USB by moving the
Linux USB compat from usb.ko to linuxkpi.ko.
- Bump the FreeBSD_version.
- A universe kernel build has been done.

Reviewed by: np @ (cxgb and cxgbe related changes only)
Sponsored by: Mellanox Technologies