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Genode OS Framework
armcpluspluscppframeworkgenodegoahypervisorlinuxmicrokernelnovaobject-capabilitiesoperating-systemosdevriscvsculpt-ossel4virtualizationx86
3daa94ff2e
This commit contains features and buf fixes: * Catch errors during resource allocation * Because Mesa tries to allocate fence (hardware) registers for each batch buffer execution, do not allocate new fences for buffer objects that are already fenced * Add support for global hardware status page. Each context additionally has a per-process hardware status page, which we used to set the global hardware status page during Vgpu switch. This was obviously wrong. There is only one global hardware status page (set once during initialization) and a distinct per-process page for contexts. * Write the sequence number of the currently executing batch buffer to dword 52 of the per-process hardware status page. We use the pipe line command with QW_WRITE (quad word write), GLOBAL_GTT_IVB disabled (address space is per-process address space), and STORE_DATA_INDEX enabled (write goes to offset of hardware status page). This command used to write to the scratch page. But Linux now uses the first reserved word of the per-process hardware status page. * Add Gen9+ WaEnableGapsTsvCreditFix workaround. This sets the "GAPS TSV Credit fix Enable" bit of the Arbiter control register (GARBCNTLREG) as described by the documentation this bit should be set by the BIOS but is not on most Gen9/9.5 platforms. Not setting this bit leads to random GPU hangs. * Increase the context size from 20 to 22 pages for Gen9. On Gen8 the hardware context is 20 pages (1 hardware status page + 19 ring context register pages). On Gen9 the size of the ring context registers has increased by two pages to 21 pages or 81.3125 KBytes as the IGD documentation states. * The logical ring size in the ring buffer control of the execlist context has to be programmed with number of pages - 1. So 0 is 1 page. We programmed the actual number of pages before, leading to ring buffer execution of NOOPs if page behind our ring buffer was empty or GPU hangs if there was data on the page. issue #4260 |
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=================================
Genode Operating System Framework
=================================
This is the source tree of the reference implementation of the Genode OS
architecture. For a general overview about the architecture, please refer to
the project's official website:
:Official project website for the Genode OS Framework:
[https://genode.org/documentation/general-overview]
The current implementation can be compiled for 8 different kernels: Linux,
L4ka::Pistachio, L4/Fiasco, OKL4, NOVA, Fiasco.OC, seL4, and a custom
kernel for running Genode directly on ARM-based hardware. Whereas the Linux
version serves us as development vehicle and enables us to rapidly develop the
generic parts of the system, the actual target platforms of the framework are
microkernels. There is no "perfect" microkernel - and neither should there be
one. If a microkernel pretended to be fit for all use cases, it wouldn't be
"micro". Hence, all microkernels differ in terms of their respective features,
complexity, and supported hardware architectures.
Genode allows the use of each of the kernels listed above with a rich set of
device drivers, protocol stacks, libraries, and applications in a uniform way.
For developers, the framework provides an easy way to target multiple different
kernels instead of tying the development to a particular kernel technology. For
kernel developers, Genode contributes advanced workloads, stress-testing their
kernel, and enabling a variety of application use cases that would not be
possible otherwise. For users and system integrators, it enables the choice of
the kernel that fits best with the requirements at hand for the particular
usage scenario.
Documentation
#############
The primary documentation is the book "Genode Foundations", which is available
on the front page of Genode website:
:Download the book "Genode Foundations":
[https://genode.org]
The book describes Genode in a holistic and comprehensive way. It equips you
with a thorough understanding of the architecture, assists developers with the
explanation of the development environment and system configuration, and
provides a look under the hood of the framework. Furthermore, it contains the
specification of the framework's programming interface.
The project has a quarterly release cycle. Each version is accompanied with
detailed release documentation, which is available at the documentation
section of the project website:
:Release documentation:
[https://genode.org/documentation/release-notes/]
Directory overview
##################
The source tree is composed of the following subdirectories:
:'doc':
This directory contains general documentation along with a comprehensive
collection of release notes.
:'repos':
This directory contains the source code, organized in so-called source-code
repositories. Please refer to the README file in the 'repos' directory to
learn more about the roles of the individual repositories.
:'tool':
Source-code management tools and scripts. Please refer to the README file
contained in the directory.
:'depot':
Directory used by Genode's package-management tools. It contains the public
keys and download locations of software providers.
Additional community-maintained components
##########################################
The components found within the main source tree are complemented by a growing
library of additional software, which can be seamlessly integrated into Genode
system scenarios.
:Genode-world repository:
[https://github.com/genodelabs/genode-world]
Contact
#######
The best way to get in touch with Genode developers and users is the project's
mailing list. Please feel welcome to join in!
:Genode Mailing Lists:
[https://genode.org/community/mailing-lists]
Commercial support
##################
The driving force behind the Genode OS Framework is the German company Genode
Labs. The company offers commercial licensing, trainings, support, and
contracted development work:
:Genode Labs website:
[https://www.genode-labs.com]