LinuxKPI: Remove linux/sched.h include from linux/kernel.h header

This include prevents usage of any kernel.h helpers in sched.h and
all of dependencies. Linux does not have it too.
Fix building of

LinuxKPI: Remove linux/sched.h include from linux/kernel.h header

This include prevents usage of any kernel.h helpers in sched.h and
all of dependencies. Linux does not have it too.
Fix building of kernel and drm-kmod after than.

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by: manu, bz
Differential Revision: https://reviews.freebsd.org/D45692

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linuxkpi: fix iteration in __sg_alloc_table_from_pages

Commit 3f686532c9b4 tried to fix an issue with not properly starting
at the first page in the sg list to prevent a panic. This worked but
with

linuxkpi: fix iteration in __sg_alloc_table_from_pages

Commit 3f686532c9b4 tried to fix an issue with not properly starting
at the first page in the sg list to prevent a panic. This worked but
with the side effect of incrementing "s" during the final iteration
causing it to be NULL since the list had ended.
In cases non-DEBUG kernels this causes a panic with drm-5.15, since
"s" is NULL when we later pass it to sg_mark_end().
This change decouples the iteration sg from the return value so that
it is never incremented past the final page in the chain.

MFC after: 3 days
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D41574

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

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

LinuxKPI: cleanup internal calls to VM_PAGE_TO_PHYS

Replace FreeBSD native VM_PAGE_TO_PHYS() calls with page_to_phys()
allowing us to work on a struct page in the future using the one
single public

LinuxKPI: cleanup internal calls to VM_PAGE_TO_PHYS

Replace FreeBSD native VM_PAGE_TO_PHYS() calls with page_to_phys()
allowing us to work on a struct page in the future using the one
single public Linux KPI interface to map to a native FreeBSD vm_page.

This should be a NOP.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D41256

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linuxkpi: Fix __sg_alloc_table_from_pages loop

Commit 3e0856b63fe0e375a0951e05c2ef98bb2ebd9421 updated
__sg_alloc_table_from_pages to use the same API as linux, but modified
the loop condition when

linuxkpi: Fix __sg_alloc_table_from_pages loop

Commit 3e0856b63fe0e375a0951e05c2ef98bb2ebd9421 updated
__sg_alloc_table_from_pages to use the same API as linux, but modified
the loop condition when going over the pages in a sg list. Part of the
change included moving the sg_next call out of the for loop and into the
body, which causes an off by one error when traversing the list. Since
sg_next is called before the loop body it will skip the first element
and read one past the last element.

This caused panics when running PRIME with nvidia-drm as the off-by-one
issue causes a NULL dereference.

Reviewed by: bz, hselasky
Differential Revision: https://reviews.freebsd.org/D39628
Fixes: 3e0856b63fe0 ("linuxkpi: Fix `sg_alloc_table_from_pages()` to have the same API as Linux")

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linuxkpi: Add `sg_alloc_table_from_pages_segment()`

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38541

linuxkpi: Fix `sg_alloc_table_from_pages()` to have the same API as Linux

It now returns a `struct scatterlist *` pointer instead of an error
code only.

The implementation is incomplete because it

linuxkpi: Fix `sg_alloc_table_from_pages()` to have the same API as Linux

It now returns a `struct scatterlist *` pointer instead of an error
code only.

The implementation is incomplete because it doesn't use the `prv`
argument.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38077

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linuxkpi: Add for_each_sgtable_{sg,page}

Needed by drm-kmod.

Reviewed by: bz
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.o

linuxkpi: Add for_each_sgtable_{sg,page}

Needed by drm-kmod.

Reviewed by: bz
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36098

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linuxkpi: Add for_each_sgtable_dma_sg and for_each_sgtable_dma_page

Variants of for_each_sg/for_each_sg_dma_page but they operate on sgtable
structs.
Needed by drm v5.10

MFC after: 1 week
Sponsored

linuxkpi: Add for_each_sgtable_dma_sg and for_each_sgtable_dma_page

Variants of for_each_sg/for_each_sg_dma_page but they operate on sgtable
structs.
Needed by drm v5.10

MFC after: 1 week
Sponsored by: Beckhoff Automation GmbH & Co. KG

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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: Add sg_init_one

Needed for the virtio-gpu driver.

Reviewed By: #linuxkpi, manu, bz, hselasky
Differential Revision: https://reviews.freebsd.org/D32366

LinuxKPI: Import linux_page.c and some dependent code from drm-kmod

No functional changes intended

Reviewed by: hselasky, manu, markj
MFC after: 2 weeks
Differential revision: https://reviews.freeb

LinuxKPI: Import linux_page.c and some dependent code from drm-kmod

No functional changes intended

Reviewed by: hselasky, manu, markj
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D32167

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LinuxKPI: fix sg_pcopy_from_buffer()

In sg_pcopy_from_buffer() is an error in that skip can underflow
and lead to bogus page arithmetics which may lead to memory corruption
or more likely panics. O

LinuxKPI: fix sg_pcopy_from_buffer()

In sg_pcopy_from_buffer() is an error in that skip can underflow
and lead to bogus page arithmetics which may lead to memory corruption
or more likely panics. Once we found a s/g page to copy into there
is nothing to skip anymore so simply set skip to 0.

Sponsored by: The FreeBSD Foundation
MFC after: 5 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30676

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LinuxKPI: upstream a collection of drm-kmod conflicting changes

The upcoming in-kernel implementations for LinuxKPI based on work on
iwlwifi (and other wireless drivers) conflicts in a few places wi

LinuxKPI: upstream a collection of drm-kmod conflicting changes

The upcoming in-kernel implementations for LinuxKPI based on work on
iwlwifi (and other wireless drivers) conflicts in a few places with
the drm-kmod graphics work outside the base system.

In order to transition smoothly extract the conflicting bits.
This included "unaligned" accessor functions, sg_pcopy_from_buffer(),
IS_*() macros (to be further restricted in the future), power management
bits (possibly no longer conflicting with DRM), and other minor changes.

Obtained-from: bz_iwlwifi
Sponsored-by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: kib, hselasky, manu, bdragon (looked at earlier versions)
Differential Revision: https://reviews.freebsd.org/D26598

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Prefer using the MIN() function macro over the min() inline function
in the LinuxKPI. Linux defines min() to be a macro, while in FreeBSD
min() is a static inline function clamping its arguments to
"

Prefer using the MIN() function macro over the min() inline function
in the LinuxKPI. Linux defines min() to be a macro, while in FreeBSD
min() is a static inline function clamping its arguments to
"unsigned int".

MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking

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compat: clean up empty lines in .c and .h files

Optimise use of sg_page_count() in __sg_page_iter_next() in the LinuxKPI.
No need to compute value twice.

No functional change intended.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Implement more scatter and gather functions in the LinuxKPI.

Differential Revision: https://reviews.freebsd.org/D24611
Submitted by: ashafer_badland.io (Austin Shafer)
MFC after: 1 week
Sponsored by

Implement more scatter and gather functions in the LinuxKPI.

Differential Revision: https://reviews.freebsd.org/D24611
Submitted by: ashafer_badland.io (Austin Shafer)
MFC after: 1 week
Sponsored by: Mellanox Technologies

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MFHead @347527

Sponsored by: The FreeBSD Foundation

Fix regression issue after r346645 in the LinuxKPI.

The S/G list must be mapped AS-IS without any optimisations.
This also implies that sg_dma_len() must be equal to sg->length.
Many Linux drivers a

Fix regression issue after r346645 in the LinuxKPI.

The S/G list must be mapped AS-IS without any optimisations.
This also implies that sg_dma_len() must be equal to sg->length.
Many Linux drivers assume this and this fixes some DRM issues.

Put the BUS DMA map pointer into the scatter-gather list to
allow multiple mappings on the same physical memory address.

The FreeBSD version has been bumped to force recompilation of
external kernel modules.

Sponsored by: Mellanox Technologies

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LinuxKPI should use bus_dma(9) to be compatible with an IOMMU

Reviewed by: hselasky, kib
Tested by: greg@unrelenting.technology
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.f

LinuxKPI should use bus_dma(9) to be compatible with an IOMMU

Reviewed by: hselasky, kib
Tested by: greg@unrelenting.technology
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D19845

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MFHead@r345275

Implement sg_virt() function in the LinuxKPI.

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

Define SG_CHAIN and SG_END in the LinuxKPI.

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

Implement the __sg_alloc_table_from_pages() function based on the existing
sg_alloc_table_from_pages() function in the LinuxKPI.

This basically allow segments to have a limit, max_segment.

Submitte

Implement the __sg_alloc_table_from_pages() function based on the existing
sg_alloc_table_from_pages() function in the LinuxKPI.

This basically allow segments to have a limit, max_segment.

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

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