src/sys/dev/drm2, branch stable/14

Avoid waiting on physical allocations that can't possibly be satisfied

2025-09-19T11:41:37+00:00

- Change vm_page_reclaim_contig[_domain] to return an errno instead
  of a boolean.  0 indicates a successful reclaim, ENOMEM indicates
  lack of available memory to reclaim, with any other error (currently
  only ERANGE) indicating that reclamation is impossible for the
  specified address range.  Change all callers to only follow
  up with vm_page_wait* in the ENOMEM case.

- Introduce vm_domainset_iter_ignore(), which marks the specified
  domain as unavailable for further use by the iterator.  Use this
  function to ignore domains that can't possibly satisfy a physical
  allocation request.  Since WAITOK allocations run the iterators
  repeatedly, this avoids the possibility of infinitely spinning
  in domain iteration if no available domain can satisfy the
  allocation request.

PR:		274252
Reported by:	kevans
Tested by:	kevans
Reviewed by:	markj
Differential Revision: https://reviews.freebsd.org/D42706

(cherry picked from commit 2619c5ccfe1f7889f0241916bd17d06340142b05)

MFCed as a prerequisite for further MFC of VM domainset changes.  Based
on analysis, it would not hurt, and I have been using it in productions
for months now.

Resolved the trivial conflict due to commit 718d1928f874 ("LinuxKPI:
make linux_alloc_pages() honor __GFP_NORETRY") having been MFCed before
this one.

log2: move log2 functions from linuxkpi to libkern

2025-02-10T10:29:23+00:00

Linux has a header file that defines an ilog2 function and some simple
functions/macros that use it: roundup_pow_of_two, is_power_of_2,
rounddown_pow_of_two, and order_base_2.  This change moves three of
those simple functions (all but is_power_of_2) from linuxkpi to
libkern.  It also deletes a few implementations of these functions
that have previously been copied into code for various device drivers,
so that they can use the libkern version.  The is_power_of_2 macro was
not moved because powerof2 in param.h provides almost the same service
already (except that they disagree about whether 0 is a power of two).

Since the linux definitions of these functions were copied into
FreeBSD 11 years ago, linux has improved them, and this change
provides those improvements.  In particular, a giant table of log
values for evaluating ilog2 for constant values is no longer
necessary.

Reviewed by:	alc, markj (previous version)
Differential Revision:	https://reviews.freebsd.org/D45536

(cherry picked from commit c8b0c33b03ac072413b27bed2bdae2ae27426f3a)

drm2: Remove one more implementation of ilog2()

2025-02-10T10:28:24+00:00

Reviewed by:	dougm
Fixes:		b0056b31e900 ("libkern: add ilog2 macro")
Differential Revision:	https://reviews.freebsd.org/D45504

(cherry picked from commit c70c791f06601309201f6ca99d39fee83f5dd368)

drm2: Stop checking for failures from malloc(M_WAITOK)

2024-09-30T04:44:21+00:00

MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D45852

(cherry picked from commit 6dbf3aca4f5c4f7287f186360c2391f2adfea8d6)

drm2: whack set-but-not-used warns

2023-09-18T21:14:19+00:00

immediate MFC to unbreak the build

(cherry picked from commit c9130a46bca272492b4f29429ed340504b8eced7)

drm2: fix build after abs64 became global

2023-09-18T21:00:11+00:00

Fixes: 229c65a83fb ("kern: Globally define abs64")
Sponsored by:	Rubicon Communications, LLC ("Netgate")

(cherry picked from commit ef545fe7ba6628054765c81624bb5f95884d45f2)

sys: Remove $FreeBSD$: one-line .c pattern

2023-08-16T17:54:36+00:00

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

sys: Remove $FreeBSD$: one-line .c comment pattern

2023-08-16T17:54:24+00:00

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

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

2023-08-16T17:54:18+00:00

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

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

2023-08-16T17:54:11+00:00

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