4243cd5388
We see that if the HW doesn't actually sleep, the HW may eat the poison we set in its write-only HWSP during sanitize: intel_gt_resume.part.8: 0000:00:02.0 __gt_unpark: 0000:00:02.0 gt_sanitize: 0000:00:02.0 force:yes process_csb: 0000:00:02.0 vcs0: cs-irq head=5, tail=90 process_csb: 0000:00:02.0 vcs0: csb[0]: status=0x5a5a5a5a:0x5a5a5a5a assert_pending_valid: Nothing pending for promotion! The CS TAIL pointer should have been reset by reset_csb_pointers(), so in this case it is likely that we have read back from the CPU cache and so we must clflush our control over that page. In doing so, push the sanitisation to the start of the GT sequence so that our poisoning is assuredly before we start talking to the HW. References: https://gitlab.freedesktop.org/drm/intel/-/issues/1794 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200427084000.10999-1-chris@chris-wilson.co.uk |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| 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 | ||
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.