linuxkpi: Add `folio` and `folio_batch` APIs

They are used by the i915 DRM driver in Linux 6.6 (although this change
was only backported with Linux 6.7 DRM drivers).

`struct folio` simply wraps `st

linuxkpi: Add `folio` and `folio_batch` APIs

They are used by the i915 DRM driver in Linux 6.6 (although this change
was only backported with Linux 6.7 DRM drivers).

`struct folio` simply wraps `struct page` for now.

`struct folio_batch` is the same as `struct pagevec` but it works with
`struct folio` instead of `struct page` directly.

Reviewed by: bz, kib, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D48743

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linuxkpi: Make "free page" code paths closer to Linux

There is basically one code path to free pages on Linux. In particular,
`free_pages()` is used for other pages than those returned by
`alloc_pag

linuxkpi: Make "free page" code paths closer to Linux

There is basically one code path to free pages on Linux. In particular,
`free_pages()` is used for other pages than those returned by
`alloc_pages()`.

Also on Linux, `release_pages()` takes either `struct page` or `struct
folio`. `struct folio` support will be added in a followup commit.
Regardless, because pages come from several sources,
`linux_free_pages()` need to accept managed and unmanaged pages.

Reviewed by: bz, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D49813

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linuxkpi: Constify `struct page` arg to `linux_page_address()`

Reviewed by: emaste, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D49812

linuxkpi: Move `put_page()` closer to `get_page()`

This is to prepare a future change to the implementation and make it
easier to review.

Reviewed by: emaste, markj
Sponsored by: The FreeBSD Founda

linuxkpi: Move `put_page()` closer to `get_page()`

This is to prepare a future change to the implementation and make it
easier to review.

Reviewed by: emaste, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D49811

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linuxkpi: Move `release_pages()` to linux_page.c

We want to avoid putting code managing memory in inline functions in the
future.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differentia

linuxkpi: Move `release_pages()` to linux_page.c

We want to avoid putting code managing memory in inline functions in the
future.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D49810

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LinuxKPI: Remove vmas argument from get_user_pages on KBI layer

To chase Linux kernel 6.5

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu
Differential Revision: https://reviews.freebsd

LinuxKPI: Remove vmas argument from get_user_pages on KBI layer

To chase Linux kernel 6.5

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D45850

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LinuxKPI: Remove vmas argument from get_user_pages on KPI layer

To chase Linux kernel 6.5

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by: manu, emaste
Differential Revision

LinuxKPI: Remove vmas argument from get_user_pages on KPI layer

To chase Linux kernel 6.5

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by: manu, emaste
Differential Revision: https://reviews.freebsd.org/D45614

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LinuxKPI: Add header polution to compile linux/numa.h

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by: manu, bz, emaste
Differential Revision: https://reviews.freebsd.org/D45

LinuxKPI: Add header polution to compile linux/numa.h

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week
Reviewed by: manu, bz, emaste
Differential Revision: https://reviews.freebsd.org/D45612

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LinuxKPI: Move page_address definition from linux/gfp.h to linux/mm.h

To match Linux. Some future changes may depend on proper location.

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week

LinuxKPI: Move page_address definition from linux/gfp.h to linux/mm.h

To match Linux. Some future changes may depend on proper location.

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week
Reviewed by: bz, emaste
Differential Revision: https://reviews.freebsd.org/D45448

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LinuxKPI: Add want_init_on_free to linux/mm.h

want_init_on_free returns if heap memory zeroing on free is enabled.
FreeBSD does not zeroes heap memory on free().

Sponsored by: Serenity Cyber Securi

LinuxKPI: Add want_init_on_free to linux/mm.h

want_init_on_free returns if heap memory zeroing on free is enabled.
FreeBSD does not zeroes heap memory on free().

Sponsored by: Serenity Cyber Security
Reviewed by: emaste
MFC after: 1 week

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LinuxKPI: Add vm_flags_(clear|set) functions

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: emaste
MFC after: 1 week

LinuxKPI: Add VM_ACCESS_FLAGS define to linux/mm.h

VM_ACCESS_FLAGS is a basic access permission flags.

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

LinuxKPI: Import vanilla linux/overflow.h

It is dual-licensed (GPLv2 & MIT) and self-contained header file.
No need to reimplement it.

Sponsored by: Serenity CyberSecurity, LLC
Reviewed by: emaste

LinuxKPI: Import vanilla linux/overflow.h

It is dual-licensed (GPLv2 & MIT) and self-contained header file.
No need to reimplement it.

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

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

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

LinuxKPI: reduce usage of struct vm_page and vm_page_t

We currently define (Linux) page to (FreeBSD) vm_page.
Cleanup some of the direct struct vm_page and vm_page_t declarations
and usages in the L

LinuxKPI: reduce usage of struct vm_page and vm_page_t

We currently define (Linux) page to (FreeBSD) vm_page.
Cleanup some of the direct struct vm_page and vm_page_t declarations
and usages in the Linux KPI and make them 'struct page' or
'struct page *' to prepare for more upcoming work.

This should be a NOP.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D41255

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linuxkpi: Define `totalram_pages()`

It returns `physmem`.

`__FreeBSD_version` is bumped to 1400080. We need that to remove a copy
of this function in the i915 DRM driver, maintained outside of base

linuxkpi: Define `totalram_pages()`

It returns `physmem`.

`__FreeBSD_version` is bumped to 1400080. We need that to remove a copy
of this function in the i915 DRM driver, maintained outside of base.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38531

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LinuxKPI: mm.h: implement virt_to_head_page()

Implement virt_to_head_page().

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

LinuxKPI: mm.h: implement virt_to_head_page()

Implement virt_to_head_page().

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D38240

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linuxkpi: Define `might_alloc()`

... as a no-op.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38146

linuxkpi: Add `freeram` and `freehigh` to `struct sysinfo`

The struct layout is modified with this commit because new fields are
added in the middle, keeping original Linux order.

Reviewed by: manu

linuxkpi: Add `freeram` and `freehigh` to `struct sysinfo`

The struct layout is modified with this commit because new fields are
added in the middle, keeping original Linux order.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D37932

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linuxkpi: Add `pin_user_pages*()` functions

They were defined in the i915 DRM driver. I move the code in linuxkpi so
it can benefit other drivers.

Reviewed by: manu
Approved by: manu
Differential R

linuxkpi: Add `pin_user_pages*()` functions

They were defined in the i915 DRM driver. I move the code in linuxkpi so
it can benefit other drivers.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38078

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linuxkpi: Define `is_cow_mapping(flags)` as false

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38158

linuxkpi: Add `io_mapping_map_user()` and `remap_pfn_range()`

The code comes from the i915 DRM driver.

In Linux commits b739f125e4ebd73d10ed30a856574e13649119ed and
b12d691ea5e01db42ccf3b4207e57cb3

linuxkpi: Add `io_mapping_map_user()` and `remap_pfn_range()`

The code comes from the i915 DRM driver.

In Linux commits b739f125e4ebd73d10ed30a856574e13649119ed and
b12d691ea5e01db42ccf3b4207e57cb3ce7cfe91 (Linux 5.13), the i915 DRM
driver dropped specific implementations to use Linux generic functions.
Therefore I moved the FreeBSD code from that i915 driver to linuxkpi.

However, these commits were later reverted (also in Linux 5.13) so the
i915 driver doesn't use these functions. But perhaps it will help in the
future.

To sum up, the code comes from the i915 DRM driver but it doesn't use it
(i.e. it continues to use its internal implementation).

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38088

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linuxkpi: Introduce `vma_set_file()`

This code was moved from the i915 driver in Linux 5.11.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D36957

linuxkpi: Include <linux/shinker.h> in <linux/mm.h>

This is done like this in Linux.

Reviewed by: emaste manu
Approved by: emaste manu
Differential Revision: https://reviews.freebsd.org/D36956

linuxkpi: Add trylock_page and unlock_page

Simple wrapper around vm_page_trylock and vm_page_unlock.

Reviewed by: hselasky
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: htt

linuxkpi: Add trylock_page and unlock_page

Simple wrapper around vm_page_trylock and vm_page_unlock.

Reviewed by: hselasky
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36019

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