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: remove extern from function declarations

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: emaste (earlier version, found another two)
Differential Revision: https://revi

LinuxKPI: remove extern from function declarations

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: emaste (earlier version, found another two)
Differential Revision: https://reviews.freebsd.org/D45386

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LinuxKPI: add dev_alloc_pages()

Add dev_alloc_pages() though it seems a weird KPI, not passing a dev
despite its name. Used by updated wireless driver.

Sponsored by: The FreeBSD Foundation
MFC aft

LinuxKPI: add dev_alloc_pages()

Add dev_alloc_pages() though it seems a weird KPI, not passing a dev
despite its name. Used by updated wireless driver.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D44588

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Revert "linuxkpi: `GFP_KERNEL` equals `M_NOWAIT` now"

This change seems to break some drivers such as the mlx5*(4) drivers.

As kib@ says:
> According to the 'official' Linux kernel documentation, t

Revert "linuxkpi: `GFP_KERNEL` equals `M_NOWAIT` now"

This change seems to break some drivers such as the mlx5*(4) drivers.

As kib@ says:
> According to the 'official' Linux kernel documentation, the GFP_KERNEL
> flag implies sleepable context.

It was introduced while working on the new vt(4)/DRM integration [1].
During this work, doing sleepable allocations broke vt(4) and the DRM
drivers. However, I made further improvements and some locking-related
fixed to the new integration without revisiting the need for it.

After more testing, the improvements to the integration mentionned above
seems to make the change to `GFP_KERNEL` unneeded now. I can thus
revert it to restore expectations of other drivers.

This reverts commit 14dcd40983748596d116d91acb934a8a95ac76bc.

[1] https://github.com/freebsd/drm-kmod/pull/243

Reviewed by: kib
Approved by: kib
Differential Revision: https://reviews.freebsd.org/D42962

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sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remov

sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

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linuxkpi: `GFP_KERNEL` equals `M_NOWAIT` now

... instead of `M_WAITOK`.

[Why]
The reason is that in some places in the DRM drivers (in particular, the
framebuffer management code), kmalloc() is cal

linuxkpi: `GFP_KERNEL` equals `M_NOWAIT` now

... instead of `M_WAITOK`.

[Why]
The reason is that in some places in the DRM drivers (in particular, the
framebuffer management code), kmalloc() is called from a non-sleepable
context, such as after a call to mtx_lock(8) with an MTX_DEF mutex.

If `GFP_KERNEL` is defined as `M_WAITOK`, we hit an assertion from
witness(4).

[How]
The definition of `GFP_KERNEL` is changed to `M_NOWAIT`. This means that
callers should verify the return value of kmalloc(). Fortunately, this
is always the case in Linux.

Reviewed by: bz, emaste, manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D42054

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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 `GFP_NOFS` in `linux/gfp.h`

Reviewed by: emaste, manu
Approved by: emaste, manu
Differential Revision: https://reviews.freebsd.org/D37910

LinuxKPI: add simplified vesion of page_frag_cache

For the moment and the currently only consumer (mt76) add a simplified
version of the page_frag_cache. We will only accept fragement sizes up
to 1

LinuxKPI: add simplified vesion of page_frag_cache

For the moment and the currently only consumer (mt76) add a simplified
version of the page_frag_cache. We will only accept fragement sizes up
to 1 PAGE_SIZE (KASSERT) and we will always return a full page.
Should we add more consumers or small (or large) objects would become a
problem we can always add a more elaborate version.

Discussed with: markj
Reviewed by: markj (,hselasky commented as well)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D37595

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linuxkpi: Add `__GFP_NOMEMALLOC` kmalloc flag

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D36954

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

Add necessary bits for Linux KPI to work correctly on powerpc

PowerPC, and possibly other architectures, use different address ranges for
PCI space vs physical address space, which is only mapped at

Add necessary bits for Linux KPI to work correctly on powerpc

PowerPC, and possibly other architectures, use different address ranges for
PCI space vs physical address space, which is only mapped at resource
activation time, when the BAR gets written. The DRM kernel modules do not
activate the rman resources, soas not to waste KVA, instead only mapping
parts of the PCI memory at a time. This introduces a
BUS_TRANSLATE_RESOURCE() method, implemented in the Open Firmware/FDT PCI
driver, to perform this necessary translation without activating the
resource.

In addition to system KPI changes, LinuxKPI is updated to handle a
big-endian host, by adding proper endian swaps to the I/O functions.

Submitted by: mmacy
Reported by: hselasky
Differential Revision: https://reviews.freebsd.org/D21096

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MFHead @r350386

Sponsored by: The FreeBSD Foundation

Remove dead code added after r348743 in the LinuxKPI. The
LINUXKPI_VERSION macro is not defined for any compiled LinuxKPI code
which basically means __GFP_NOTWIRED is never checked when allocating
pa

Remove dead code added after r348743 in the LinuxKPI. The
LINUXKPI_VERSION macro is not defined for any compiled LinuxKPI code
which basically means __GFP_NOTWIRED is never checked when allocating
pages. This should work fine with the existing external DRM code as
long as the page wiring and unwiring is balanced.

MFC after: 3 days
Sponsored by: Mellanox Technologies

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MFHead @349234

Sponsored by: The FreeBSD Foundation

Make the linuxkpi's alloc_pages() consistently return wired pages.

Previously it did this only on platforms without a direct map. This
also more closely matches Linux's semantics.

Since some DRM v

Make the linuxkpi's alloc_pages() consistently return wired pages.

Previously it did this only on platforms without a direct map. This
also more closely matches Linux's semantics.

Since some DRM v5.0 code assumes the old behaviour, use a
LINUXKPI_VERSION guard to preserve that until the out-of-tree module
is updated.

Reviewed by: hselasky, kib (earlier versions), johalun
MFC after: 1 week
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20502

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Merge ^/head r339813 through r340125.

linuxkpi: Add GFP flags needed for ttm drivers

Submitted by: Johannes Lundberg <johalun0@gmail.com>
Requested by: bwidawsk
MFC after: 3 days
Approved by: emaste (mentor)

Add more GFP macro definitions in the LinuxKPI.

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

Implement __GFP_BITS_SHIFT and __GFP_BITS_MASK macros in the LinuxKPI.
Add compile time asserts to catch conflicts with native defines.

MFC after: 1 week
Submitted by: Johannes Lundberg <johalun0@gm

Implement __GFP_BITS_SHIFT and __GFP_BITS_MASK macros in the LinuxKPI.
Add compile time asserts to catch conflicts with native defines.

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

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Cleanup the LinuxKPI slab implementation.

Put large functions into linux_slab.c instead of declaring them static
inline.

Add support for more memory allocation wrappers like kmalloc_array()
and __v

Cleanup the LinuxKPI slab implementation.

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

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Merge ^/head r313896 through r314128.

Optimise unmapped LinuxKPI page allocations.

When allocating unmapped pages, take advantage of the direct map on
AMD64 to get the virtual address corresponding to a page. Else all
pages allocated mu

Optimise unmapped LinuxKPI page allocations.

When allocating unmapped pages, take advantage of the direct map on
AMD64 to get the virtual address corresponding to a page. Else all
pages allocated must be mapped because sometimes the virtual address
of a page is requested.

Move all page allocation and deallocation code into an own C-file.

Add support for GFP_DMA32, GFP_KERNEL, GFP_ATOMIC and __GFP_ZERO
allocation flags.

Make a clear separation between mapped and unmapped allocations.

Obtained from: kmacy @
MFC after: 1 week
Sponsored by: Mellanox Technologies

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Merge ^/head r313644 through r313895.