mainlining shenanigans
b97f77baa8
intel_gt_wait_for_idle() tries to wait until all the outstanding requests are retired and the GPU is idle. As a side effect of retiring requests, we may submit more work to flush any pm barriers, and so the wait-for-idle tries to flush the background pm work and catch the new requests. However, if the work completed in the background before we were able to flush, it would queue the extra barrier request without us noticing -- and so we would return from wait-for-idle with one request remaining. (This breaks e.g. record_default_state where we need to wait until that barrier is retired, and it may slow suspend down by causing us to wait on the background retirement worker as opposed to immediately retiring the barrier.) However, since we track if there has been a submission since the engine pm barrier, we can very quickly detect if the idle barrier is still outstanding. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1763 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200423085940.28168-1-chris@chris-wilson.co.uk |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
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.