linuxkpi: Introduce a properly typed jiffies

Now that we have a long-sized tick counter, we can migrate to using
properly typed timeout parameters in various bits of the LinuxKPI. This
fixes a subt

linuxkpi: Introduce a properly typed jiffies

Now that we have a long-sized tick counter, we can migrate to using
properly typed timeout parameters in various bits of the LinuxKPI. This
fixes a subtle incompatibility that is otherwise difficult to paper over
and leads to bugs when ticks values are sign-extended.

- Introduce a "jiffies" symbol in subr_ticks.S, declared only in the
LinuxKPI as an unsigned long.
- Remove all references to "ticks" from the LinuxKPI.
- Convert interfaces to match Linux's type signatures where it makes
sense.

Reviewed by: manu
Tested by: bz
Differential Revision: https://reviews.freebsd.org/D48523

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LinuxKPI: Add linux/nodemask.h

and dummy num_possible_nodes() implementation.
We do not fully support NUMA in LinuxKPI yet.

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by:

LinuxKPI: Add linux/nodemask.h

and dummy num_possible_nodes() implementation.
We do not fully support NUMA in LinuxKPI yet.

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by: manu, bz
Differential Revision: https://reviews.freebsd.org/D45613

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Revert "LinuxKPI: Add explicit software context to FPU sections"

kmalloc() support within FPU sections will be redone in other way.

This reverts commit 5a3bd281672bd6bd8e18081c3928dfe76d330a5f.

Sp

Revert "LinuxKPI: Add explicit software context to FPU sections"

kmalloc() support within FPU sections will be redone in other way.

This reverts commit 5a3bd281672bd6bd8e18081c3928dfe76d330a5f.

Sponsored by: Serenity Cyber Security, LLC
Requested by: jhb

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LinuxKPI: Add explicit software context to FPU sections

Amdgpu driver does a lot of memory allocations in FPU-protected sections
of code for certain display cores, e.g. for DCN30. This does not work

LinuxKPI: Add explicit software context to FPU sections

Amdgpu driver does a lot of memory allocations in FPU-protected sections
of code for certain display cores, e.g. for DCN30. This does not work
currently on FreeBSD as its malloc function can not be run within a
critical section. Allocate memory for FPU context to overcome such
restriction.

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu (previous version), markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D42822

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

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

linuxkpi: Include `linux/sched/mm.h` from `linux/sched.h`

At least one file in the DRM drivers benefits from some namespace
pollution to use `fs_reclaim_acquire()`/`fs_reclaim_release()`. They are
d

linuxkpi: Include `linux/sched/mm.h` from `linux/sched.h`

At least one file in the DRM drivers benefits from some namespace
pollution to use `fs_reclaim_acquire()`/`fs_reclaim_release()`. They are
defined in `linux/sched/mm.h` and this header must be included
indirectly into the DRM drivers' source file.

I couldn't find how it was included. Therefore this commit includes
`linux/sched/mm.h` from `linux/sched.h`. This is not the case in Linux
but fixes the issue with the DRM drivers.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D37912

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linuxkpi: more precise need_resched() definition

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35888

AST: rework

Make most AST handlers dynamically registered. This allows to have
subsystem-specific handler source located in the subsystem files,
instead of making subr_trap.c aware of it. For inst

AST: rework

Make most AST handlers dynamically registered. This allows to have
subsystem-specific handler source located in the subsystem files,
instead of making subr_trap.c aware of it. For instance, signal
delivery code on return to userspace is now moved to kern_sig.c.

Also, it allows to have some handlers designated as the cleanup (kclear)
type, which are called both at AST and on thread/process exit. For
instance, ast(), exit1(), and NFS server no longer need to be aware
about UFS softdep processing.

The dynamic registration also allows third-party modules to register AST
handlers if needed. There is one caveat with loadable modules: the
code does not make any effort to ensure that the module is not unloaded
before all threads processed through AST handler in it. In fact, this
is already present behavior for hwpmc.ko and ufs.ko. I do not think it
is worth the efforts and the runtime overhead to try to fix it.

Reviewed by: markj
Tested by: emaste (arm64), pho
Discussed with: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35888

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LinuxKPI: Implement sched_set_fifo(_low) functions

Required by: drm-kmod

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D35050

LinuxKPI: Add some pollution required by drm-kmod to linux/sched.h

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D35050

LinuxKPI: Fix typo in cond_resched_lock

Lock must be released rather than acquired around mi_switch call.

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebs

LinuxKPI: Fix typo in cond_resched_lock

Lock must be released rather than acquired around mi_switch call.

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D35048

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linuxkpi: Add cond_resched_lock

If we need to resched it takes the lock, resched, release the lock
and returns 1, otherwise simply returns 0.

Needed by drm v5.9

MFC after: 1 month
Reviewed by: hse

linuxkpi: Add cond_resched_lock

If we need to resched it takes the lock, resched, release the lock
and returns 1, otherwise simply returns 0.

Needed by drm v5.9

MFC after: 1 month
Reviewed by: hselasky
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D34620

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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: Convert schedule() to inlined function

to prevent name clashing with drm-kmod

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33294

LinuxKPI: Make FPU sections thread-safe and use the NOCTX flag.

Reviewed by: kib
Submitted by: greg@unrelenting.technology
Differential Revision: https://reviews.freebsd.org/D29921
MFC after: 1 week

LinuxKPI: Make FPU sections thread-safe and use the NOCTX flag.

Reviewed by: kib
Submitted by: greg@unrelenting.technology
Differential Revision: https://reviews.freebsd.org/D29921
MFC after: 1 week
Sponsored by: NVIDIA Networking

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Reduce chance of RCU deadlock in the LinuxKPI by implementing the section
feature of the concurrency kit, CK.

Differential Revision: https://reviews.freebsd.org/D29467
Reviewed by: kib@ and markj@
M

Reduce chance of RCU deadlock in the LinuxKPI by implementing the section
feature of the concurrency kit, CK.

Differential Revision: https://reviews.freebsd.org/D29467
Reviewed by: kib@ and markj@
MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking

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Merge ^/head r364082 through r364250.

MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

Need to clone the task struct fields related to RCU aswell in the
LinuxKPI after r359727. This fixes a minor regression issue. Else the
priority tracking won't work properly when both sleepable and
n

Need to clone the task struct fields related to RCU aswell in the
LinuxKPI after r359727. This fixes a minor regression issue. Else the
priority tracking won't work properly when both sleepable and
non-sleepable RCU is in use on the same thread.

Bump the __FreeBSD_version to force recompilation of external kernel
modules.

PR: 242272
MFC after: 1 week
Sponsored by: Mellanox Technologies

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MFHead @348740

Sponsored by: The FreeBSD Foundation

LinuxKPI: Add group_leader member to struct task_struct.

Assign self as group leader at creation to act as the only member of a
new process group.
This patch is part of D19565

Reviewed by: hps
Appr

LinuxKPI: Add group_leader member to struct task_struct.

Assign self as group leader at creation to act as the only member of a
new process group.
This patch is part of D19565

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

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MFHead@r345275

Implement task_euid() and get_task_state() function macros in the LinuxKPI.

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

Implement task_euid() and get_task_state() function macros in the LinuxKPI.

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

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Implement get_task_comm() in the LinuxKPI.

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

Implement current_exiting() in the LinuxKPI.

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