src/sys/modules/linuxkpi, branch releng/12.1

LinuxKPI: Revert MFC of r347892

2019-05-25T20:53:23Z

Revert until we can figure out how to keep compatibility with drm-kmod ports between 12.0 and 12-STABLE/12.1.

MFC r347892:

2019-05-25T18:36:38Z

LinuxKPI: Finalize import of seq_file. seq_file.h and linux_seq_file.c was imported form ports earlier but linux_seq_file.c was never compiled in with the module. With this commit base seq_file will replace ports seq_file and it required a few modifications to not break functionality and build. Reviewed by: hps Approved by: imp (mentor), hps

MFC r339924:

2018-11-01T15:47:07Z

Implement the dump_stack() function in the LinuxKPI. Approved by: re (gjb) Submitted by: Johannes Lundberg Sponsored by: Mellanox Technologies

Sort SRCS.

2017-06-26T21:14:33Z

MFC after: 1 week

Implement parts of the hrtimer API in the LinuxKPI.

2017-06-26T16:28:46Z

Reviewed by: hselasky MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D11359

Augment wait queue support in the LinuxKPI.

2017-06-09T19:41:12Z

In particular: - Don't evaluate event conditions with a sleepqueue lock held, since such code may attempt to acquire arbitrary locks. - Fix the return value for wait_event_interruptible() in the case that the wait is interrupted by a signal. - Implement wait_on_bit_timeout() and wait_on_atomic_t(). - Implement some functions used to test for pending signals. - Implement a number of wait_event_*() variants and unify the existing implementations. - Unify the mechanism used by wait_event_*() and schedule() to put the calling thread to sleep. This is required to support updated DRM drivers. Thanks to hselasky for finding and fixing a number of bugs in the original revision. Reviewed by: hselasky MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D10986

Implement support for mutexes with deadlock avoidance in the LinuxKPI.

2017-03-09T18:33:40Z

When locking a mutex and deadlock is detected the first mutex lock call that sees the deadlock will return -EDEADLK . MFC after: 1 week Sponsored by: Mellanox Technologies

Cleanup the LinuxKPI slab implementation.

2017-03-08T11:09:27Z

Put large functions into linux_slab.c instead of declaring them static inline. Add support for more memory allocation wrappers like kmalloc_array() and __vmalloc(). Make sure either the M_WAITOK or the M_NOWAIT flag is set and mask away unused memory allocation flags before calling FreeBSD's malloc() routine. Move kmalloc_node() definition to slab.h where it belongs. Implement support for the SLAB_DESTROY_BY_RCU feature when creating a kmem_cache which basically means kmem_cache memory is freed using call_rcu(). MFC after: 1 week Sponsored by: Mellanox Technologies

LinuxKPI workqueue cleanup.

2017-03-07T12:09:14Z

This change makes the workqueue implementation behave more like in Linux, both functionality wise and structure wise. All workqueue code has been moved to linux_work.c Add an atomic based statemachine to the work_struct to ensure proper operation. Prior to this change struct_work was directly mapped to a FreeBSD task. When a taskqueue has multiple threads the same task may end up being executed on more than one worker thread simultaneously. This might cause problems with code coming from Linux, which expects serial behaviour, similar to Linux tasklets. Move all global workqueue function names into the linux_xxx domain to avoid symbol name clashes in the future. Implement a few more workqueue related functions and macros. Create two multithreaded taskqueues for the LinuxKPI during module load, one for time-consuming callbacks and one for non-time consuming callbacks. MFC after: 1 week Sponsored by: Mellanox Technologies

sys/modules: normalize .CURDIR-relative paths to SRCTOP

2017-03-04T10:10:17Z

This simplifies make output/logic Tested with: `cd sys/modules; make ALL_MODULES=` on amd64 MFC after: 1 month Sponsored by: Dell EMC Isilon