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Multi Queue is a new mode of execution supported by the compute and
blitter copy command streamers (CCS and BCS, respectively). It is an
enhancement of the existing hardware architecture and leverages the
same submission model. It enables support for efficient, parallel
execution of multiple queues within a single context. All the queues
of a group must use the same address space (VM).
The new DRM_XE_EXEC_QUEUE_SET_PROPERTY_MULTI_QUEUE execution queue
property supports creating a multi queue group and adding queues to
a queue group. All queues of a multi queue group share the same
context.
A exec queue create ioctl call with above property specified with value
DRM_XE_SUPER_GROUP_CREATE will create a new multi queue group with the
queue being created as the primary queue (aka q0) of the group. To add
secondary queues to the group, they need to be created with the above
property with id of the primary queue as the value. The properties of
the primary queue (like priority, timeslice) applies to the whole group.
So, these properties can't be set for secondary queues of a group.
Once destroyed, the secondary queues of a multi queue group can't be
replaced. However, they can be dynamically added to the group up to a
total of 64 queues per group. Once the primary queue is destroyed,
secondary queues can't be added to the queue group.
v2: Remove group->lock, fix xe_exec_queue_group_add()/delete()
function semantics, add additional comments, remove unused
group->list_lock, add XE_BO_FLAG_GGTT_INVALIDATE for cgp bo,
Assert LRC is valid, update uapi kernel doc.
(Matt Brost)
v3: Use XE_BO_FLAG_PINNED_LATE_RESTORE/USER_VRAM/GGTT_INVALIDATE
flags for cgp bo (Matt)
v4: Ensure queue is not a vm_bind queue
uapi change due to rebase
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251211010249.1647839-21-niranjana.vishwanathapura@intel.com
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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 reStructuredText 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.