[PATCH 00/15] Batch submission via GuC

Dave Gordon
2015-06-15T18:37:03Z

This patch series enables command submission via the GuC. In this mode,
instead of the host CPU driving the execlist port directly, it hands
over work items to the GuC, using a doorbell mechanism to tell the GuC
that new items have been added to its work queue. The GuC then dispatches
contexts to the various GPU engines, and manages the resulting context-
switch interrupts. Completion of a batch is however still signalled to
the CPU; the GuC is not involved in handling user interrupts.

There are three subsequences within the patch series:

drm/i915: Add i915_gem_object_write() to i915_gem.c
drm/i915: Embedded microcontroller (uC) firmware loading support

These first two patches provide a generic framework for fetching the
firmware that may be required by any embedded microcontroller from a
file, using an asynchronous thread so that driver initialisation can
continue while the firmware is being fetched. It is hoped that this
framework is sufficiently general that it can be used for all curent
and future microcontrollers.

drm/i915: Add GuC-related module parameters
drm/i915: Add GuC-related header files
drm/i915: GuC-specific firmware loader
drm/i915: Debugfs interface to read GuC load status

These four patches complete the GuC loader. At this point in the sequence
we can load and activate the GuC firmware, but not submit any batches
through it. (This is nonetheless a potentially useful state, as the GuC
can do other useful work even when not handling batch submissions).

drm/i915: Defer default hardware context initialisation until first
drm/i915: Move execlists defines from .c to .h
drm/i915: GuC submission setup, phase 1
drm/i915: Enable GuC firmware log
drm/i915: Implementation of GuC client
drm/i915: Interrupt routing for GuC submission
drm/i915: Integrate GuC-based command submission
drm/i915: Debugfs interface for GuC submission statistics
Documentation/drm: kerneldoc for GuC
drm/i915: Enable GuC submission, where supported

In the final section, we implement the GuC submission mechanism, link
it into the (execlist-based) submission path, and finally enable it
(on supported platforms). On platforms where there is no GuC, or if
the GuC firmware cannot be found or is invalid, batch submission will
revert to using the execlist mechanism directly.

The GuC firmware itself is not included in this patchset; it is or will
be available for download from https://01.org/linuxgraphics/downloads/
This driver works with and requires GuC firmware revision 3.x. It will
not work with any firmware version 1.x, as the GuC protocol in those
revisions was incompatible and is no longer supported.

Prerequisites: GuC submission will expose existing inadequacies in
some of the existing codepaths unless certain other patches are applied.
In particular we will require some version of Michel Thierry's patch
drm/i915/lrc: Update PDPx registers with lri commands
(because the GuC support light-restore, which execlist mode doesn't),
and my own
drm/i915: Allocate OLR more safely (workaround until OLR goes away)
because otherwise the changed timing means that there is an increased
risk of writing to a ringbuffer that is not currently pinned & mapped,
causing a kernel OOPS.

Alex Dai (10):
drm/i915: Add i915_gem_object_write() to i915_gem.c
drm/i915: Add GuC-related module parameters
drm/i915: Add GuC-related header files
drm/i915: GuC-specific firmware loader
drm/i915: Debugfs interface to read GuC load status
drm/i915: GuC submission setup, phase 1
drm/i915: Enable GuC firmware log
drm/i915: Implementation of GuC client
drm/i915: Integrate GuC-based command submission
Documentation/drm: kerneldoc for GuC

Dave Gordon (5):
drm/i915: Embedded microcontroller (uC) firmware loading support
drm/i915: Defer default hardware context initialisation until first
drm/i915: Interrupt routing for GuC submission
drm/i915: Debugfs interface for GuC submission statistics
drm/i915: Enable GuC submission, where supported

Michael H. Nguyen (1):
drm/i915: Move execlists defines from .c to .h

Ben Widawsky
Vinit Azad
created the original versions on which some of these patches are based.

Documentation/DocBook/drm.tmpl | 19 +
drivers/gpu/drm/i915/Makefile | 7 +
drivers/gpu/drm/i915/i915_debugfs.c | 109 +++-
drivers/gpu/drm/i915/i915_dma.c | 4 +
drivers/gpu/drm/i915/i915_drv.h | 17 +
drivers/gpu/drm/i915/i915_gem.c | 39 +-
drivers/gpu/drm/i915/i915_gem_context.c | 52 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 873 ++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_irq.c | 48 ++
drivers/gpu/drm/i915/i915_params.c | 9 +
drivers/gpu/drm/i915/i915_reg.h | 92 ++-
drivers/gpu/drm/i915/intel_guc.h | 184 ++++++
drivers/gpu/drm/i915/intel_guc_api.h | 227 ++++++++
drivers/gpu/drm/i915/intel_guc_loader.c | 498 ++++++++++++++++
drivers/gpu/drm/i915/intel_lrc.c | 128 ++--
drivers/gpu/drm/i915/intel_lrc.h | 8 +
drivers/gpu/drm/i915/intel_uc_loader.c | 312 ++++++++++
drivers/gpu/drm/i915/intel_uc_loader.h | 82 +++
18 files changed, 2607 insertions(+), 101 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_guc_submission.c
create mode 100644 drivers/gpu/drm/i915/intel_guc.h
create mode 100644 drivers/gpu/drm/i915/intel_guc_api.h
create mode 100644 drivers/gpu/drm/i915/intel_guc_loader.c
create mode 100644 drivers/gpu/drm/i915/intel_uc_loader.c
create mode 100644 drivers/gpu/drm/i915/intel_uc_loader.h

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1.7.9.5