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Tvrtko Ursulin 1e975e591a drm/i915: Do not disable preemption for resets Commit `ade8a0f598` ("drm/i915: Make all GPU resets atomic") added a preempt disable section over the hardware reset callback to prepare the driver for being able to reset from atomic contexts. In retrospect I can see that the work item at a time was about removing the struct mutex from the reset path. Code base also briefly entertained the idea of doing the reset under stop_machine in order to serialize userspace mmap and temporary glitch in the fence registers (see `eb8d0f5af4` ("drm/i915: Remove GPU reset dependence on struct_mutex"), but that never materialized and was soon removed in `2caffbf117` ("drm/i915: Revoke mmaps and prevent access to fence registers across reset") and replaced with a SRCU based solution. As such, as far as I can see, today we still have a requirement that resets must not sleep (invoked from submission tasklets), but no need to support invoking them from a truly atomic context. Given that the preemption section is problematic on RT kernels, since the uncore lock becomes a sleeping lock and so is invalid in such section, lets try and remove it. Potential downside is that our short waits on GPU to complete the reset may get extended if CPU scheduling interferes, but in practice that probably isn't a deal breaker. In terms of mechanics, since the preemption disabled block is being removed we just need to replace a few of the wait_for_atomic macros into busy looping versions which will work (and not complain) when called from non-atomic sections. v2: * Fix timeouts which are now in us. (Andi) * Update one comment as a drive by. (Andi) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Chris Wilson <chris.p.wilson@intel.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230926100855.61722-1-tvrtko.ursulin@linux.intel.com		2023-09-27 11:43:44 +01:00
arch	sh: mach-sh7763rdp: Assign FB_MODE_IS_UNKNOWN to struct fb_videomode.flag	2023-07-24 16:50:38 +02:00
block	SCSI fixes on 20230714	2023-07-14 19:57:29 -07:00
certs	KEYS: Add missing function documentation	2023-04-24 16:15:52 +03:00
crypto	crypto: algif_hash - Fix race between MORE and non-MORE sends	2023-07-08 22:48:42 +10:00
Documentation	- Removing unused declarations (Arnd, Gustavo)	2023-08-07 13:47:30 +10:00
drivers	drm/i915: Do not disable preemption for resets	2023-09-27 11:43:44 +01:00
fs	Five smb3 client fixes	2023-07-16 12:49:05 -07:00
include	drm/i915/mtl: Adding DeviceID for Arrowlake-S under MTL	2023-08-23 08:07:39 -07:00
init	Kbuild updates for v6.5	2023-07-01 09:24:31 -07:00
io_uring	io_uring-6.5-2023-07-14	2023-07-14 19:46:54 -07:00
ipc	Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2023-02-24 19:20:07 -08:00
kernel	- Remove a cgroup from under a polling process properly	2023-07-16 13:22:08 -07:00
lib	iov_iter: Mark copy_iovec_from_user() noclone	2023-07-10 09:52:28 +02:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm: lock newly mapped VMA with corrected ordering	2023-07-08 16:44:11 -07:00
net	A fix to prevent a potential buffer overrun in the messenger, marked	2023-07-14 09:05:15 -07:00
rust	rust: error: `impl Debug` for `Error` with `errname()` integration	2023-06-13 01:24:42 +02:00
samples	vfio-mdev: Remove flag FBINFO_DEFAULT from fbdev sample driver	2023-07-24 16:50:38 +02:00
scripts	kallsyms: strip LTO-only suffixes from promoted global functions	2023-07-12 15:39:34 -07:00
security	+ Bug Fixes	2023-07-07 09:55:31 -07:00
sound	sound fixes for 6.5-rc1	2023-07-07 15:40:17 -07:00
tools	- Mark copy_iovec_from_user() __noclone in order to prevent gcc from	2023-07-16 13:34:29 -07:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	ARM64:	2023-07-03 15:32:22 -07:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	Revert ".gitignore: ignore .cover and .mbx"	2023-07-04 15:05:12 -07:00
.mailmap	spi: Fixes for v6.5	2023-07-15 08:51:02 -07:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	- Address -Wmissing-prototype warnings	2023-06-26 16:43:54 -07:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	drm-misc-next for v6.6:	2023-07-17 15:37:57 +02:00
Makefile	Linux 6.5-rc2	2023-07-16 15:10:37 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.