Go to file
Chris Wilson 0e53656ad8 drm/i915: Fix mismatch between misplaced vma check and vma insert
When inserting a VMA, we restrict the placement to the low 4G unless the
caller opts into using the full range. This was done to allow usersapce
the opportunity to transition slowly from a 32b address space, and to
avoid breaking inherent 32b assumptions of some commands.

However, for insert we limited ourselves to 4G-4K, but on verification
we allowed the full 4G. This causes some attempts to bind a new buffer
to sporadically fail with -ENOSPC, but at other times be bound
successfully.

commit 48ea1e32c3 ("drm/i915/gen9: Set PIN_ZONE_4G end to 4GB - 1
page") suggests that there is a genuine problem with stateless addressing
that cannot utilize the last page in 4G and so we purposefully excluded
it. This means that the quick pin pass may cause us to utilize a buggy
placement.

Reported-by: CQ Tang <cq.tang@intel.com>
Testcase: igt/gem_exec_params/larger-than-life-batch
Fixes: 48ea1e32c3 ("drm/i915/gen9: Set PIN_ZONE_4G end to 4GB - 1 page")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: CQ Tang <cq.tang@intel.com>
Reviewed-by: CQ Tang <cq.tang@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v4.5+
Link: https://patchwork.freedesktop.org/patch/msgid/20201216092951.7124-1-chris@chris-wilson.co.uk
(cherry picked from commit 5f22cc0b13)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2020-12-18 12:30:10 +02:00
Documentation Short summary of fixes pull (less than what git shortlog provides): 2020-12-15 17:25:55 +01:00
LICENSES
arch drm for 5.11-rc1 2020-12-14 11:07:56 -08:00
block
certs
crypto
drivers drm/i915: Fix mismatch between misplaced vma check and vma insert 2020-12-18 12:30:10 +02:00
fs io_uring-5.10-2020-12-11 2020-12-12 09:45:01 -08:00
include Short summary of fixes pull (less than what git shortlog provides): 2020-12-15 17:25:55 +01:00
init initramfs: fix clang build failure 2020-12-11 14:02:14 -08:00
ipc
kernel A set of x86 and membarrier fixes: 2020-12-13 11:31:19 -08:00
lib drm for 5.11-rc1 2020-12-14 11:07:56 -08:00
mm drm-misc-next for 5.11: 2020-12-15 10:21:48 +01:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2020-12-10 14:29:30 -08:00
samples
scripts
security
sound
tools drm for 5.11-rc1 2020-12-14 11:07:56 -08:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS drm for 5.11-rc1 2020-12-14 11:07:56 -08:00
Makefile Linux 5.10 2020-12-13 14:41:30 -08:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.