linux-kernel - [PATCH 00/10] Dynamic Host1x channel allocation

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Date:   Sun,  5 Nov 2017 13:01:08 +0200
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     thierry.reding@...il.com, jonathanh@...dia.com
Cc:     digetx@...il.com, dri-devel@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH 00/10] Dynamic Host1x channel allocation

Hi all,

this adds support for a new model of hardware channel allocation for
Host1x/TegraDRM. In the current model, one hardware channel is
allocated for each client device at probe time. This is simple but
does not allow for optimal use of hardware resources.

In the new model, we allocate channels dynamically when a
"userspace channel", opened using the channel open IOCTL, has pending
jobs. However, each userspace channel can only have one assigned
channel at a time, ensuring current serialization behavior is kept.
As such there is no change in programming model for the userspace.

The patch adapts VIC to use the new model - GR2D and GR3D are not
modified, as the older Tegra chips they are found on do not have
a large number of hardware channels and therefore it is not clear
if the new model is beneficial (and I don't have access to those
chips to test it out).

Tested using the host1x_test test suite, and also by running
the performance test of host1x_test in parallel.

Thanks,
Mikko

Mikko Perttunen (10):
  gpu: host1x: Parameterize channel aperture size
  gpu: host1x: Print MLOCK state in debug dumps on T186
  gpu: host1x: Add lock around channel allocation
  gpu: host1x: Lock classes during job submission
  gpu: host1x: Add job done callback
  drm/tegra: Deliver job completion callback to client
  drm/tegra: Make syncpoints be per-context
  drm/tegra: Implement dynamic channel allocation model
  drm/tegra: Boot VIC in runtime resume
  gpu: host1x: Optionally block when acquiring channel

 drivers/gpu/drm/tegra/drm.c                    |  82 +++++++++++++++--
 drivers/gpu/drm/tegra/drm.h                    |  12 ++-
 drivers/gpu/drm/tegra/gr2d.c                   |   8 +-
 drivers/gpu/drm/tegra/gr3d.c                   |   8 +-
 drivers/gpu/drm/tegra/vic.c                    | 120 ++++++++++++------------
 drivers/gpu/host1x/cdma.c                      |  45 ++++++---
 drivers/gpu/host1x/cdma.h                      |   1 +
 drivers/gpu/host1x/channel.c                   |  47 ++++++++--
 drivers/gpu/host1x/channel.h                   |   3 +
 drivers/gpu/host1x/hw/cdma_hw.c                | 122 +++++++++++++++++++++++++
 drivers/gpu/host1x/hw/channel_hw.c             |  74 +++++++++++----
 drivers/gpu/host1x/hw/debug_hw_1x06.c          |  18 +++-
 drivers/gpu/host1x/hw/host1x01_hardware.h      |  10 ++
 drivers/gpu/host1x/hw/host1x02_hardware.h      |  10 ++
 drivers/gpu/host1x/hw/host1x04_hardware.h      |  10 ++
 drivers/gpu/host1x/hw/host1x05_hardware.h      |  10 ++
 drivers/gpu/host1x/hw/host1x06_hardware.h      |  10 ++
 drivers/gpu/host1x/hw/hw_host1x01_channel.h    |   2 +
 drivers/gpu/host1x/hw/hw_host1x01_sync.h       |   6 ++
 drivers/gpu/host1x/hw/hw_host1x02_channel.h    |   2 +
 drivers/gpu/host1x/hw/hw_host1x02_sync.h       |   6 ++
 drivers/gpu/host1x/hw/hw_host1x04_channel.h    |   2 +
 drivers/gpu/host1x/hw/hw_host1x04_sync.h       |   6 ++
 drivers/gpu/host1x/hw/hw_host1x05_channel.h    |   2 +
 drivers/gpu/host1x/hw/hw_host1x05_sync.h       |   6 ++
 drivers/gpu/host1x/hw/hw_host1x06_hypervisor.h |   5 +
 drivers/gpu/host1x/hw/hw_host1x06_vm.h         |   2 +
 include/linux/host1x.h                         |   6 +-
 28 files changed, 517 insertions(+), 118 deletions(-)

-- 
2.14.2