linux-stable.git/drivers/gpu/host1x/bus.c, branch linux-5.4.y

gpu: host1x: Do not setup DMA for virtual devices

2024-05-17T09:43:52+00:00

[ Upstream commit 8ab58f6841b19423231c5db3378691ec80c778f8 ]

The host1x devices are virtual compound devices and do not perform DMA
accesses themselves, so they do not need to be set up for DMA.

Ideally we would also not need to set up DMA masks for the virtual
devices, but we currently still need those for legacy support on old
hardware.

Tested-by: Jon Hunter 
Acked-by: Jon Hunter 
Signed-off-by: Thierry Reding 
Link: https://patchwork.freedesktop.org/patch/msgid/20240314154943.2487549-1-thierry.reding@gmail.com
Signed-off-by: Sasha Levin

gpu: host1x: Detach driver on unregister

2020-07-16T06:16:33+00:00

[ Upstream commit d9a0a05bf8c76e6dc79230669a8b5d685b168c30 ]

Currently when a host1x device driver is unregistered, it is not
detached from the host1x controller, which means that the device
will stay around and when the driver is registered again, it may
bind to the old, stale device rather than the new one that was
created from scratch upon driver registration. This in turn can
cause various weird crashes within the driver core because it is
confronted with a device that was already deleted.

Fix this by detaching the driver from the host1x controller when
it is unregistered. This ensures that the deleted device also is
no longer present in the device list that drivers will bind to.

Reported-by: Sowjanya Komatineni 
Signed-off-by: Thierry Reding 
Tested-by: Sowjanya Komatineni 
Signed-off-by: Thierry Reding 
Signed-off-by: Sasha Levin

Merge tag 'drm/tegra/for-5.3-rc1' of git://anongit.freedesktop.org/tegra/linux into drm-next

2019-06-25T02:59:43+00:00

drm/tegra: Changes for v5.3-rc1

This contains a couple of small improvements and cleanups for the Tegra
DRM driver.

Signed-off-by: Dave Airlie 

From: Thierry Reding 
Link: https://patchwork.freedesktop.org/patch/msgid/20190621150753.19550-1-thierry.reding@gmail.com

gpu: host1x: Do not link logical devices to DT nodes

2019-06-05T13:06:03+00:00

Logical devices created by the host1x bus infrastructure don't need to
be associated with a device tree node. Doing so will cause the driver
core to attempt to hook up IOMMU operations and fail because it is not
a real device.

However, for backwards-compatibility, we need to provide various OF_*
uevent variables that were previously provided by of_device_uevent() and
which are parsed by libdrm in userspace when querying the available
devices. Do this by implementing a uevent callback for the host1x bus.

Signed-off-by: Thierry Reding

gpu: host1x: Increase maximum DMA segment size

2019-06-05T13:06:03+00:00

Recent versions of the DMA API debug code have started to warn about
violations of the maximum DMA segment size. This is because the segment
size defaults to 64 KiB, which can easily be exceeded in large buffer
allocations such as used in DRM/KMS for framebuffers.

Technically the Tegra SMMU and ARM SMMU don't have a maximum segment
size (they map individual pages irrespective of whether they are
contiguous or not), so the choice of 4 MiB is a bit arbitrary here. The
maximum segment size is a 32-bit unsigned integer, though, so we can't
set it to the correct maximum size, which would be the size of the
aperture.

Signed-off-by: Thierry Reding

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201

2019-05-30T18:29:52+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 228 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Reviewed-by: Steve Winslow 
Reviewed-by: Richard Fontana 
Reviewed-by: Alexios Zavras 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de
Signed-off-by: Greg Kroah-Hartman

gpu: host1x: Represent host1x bus devices in debugfs

2019-02-04T07:35:54+00:00

This new debugfs file represents the state of host1x bus devices,
specifying the list of subdevices and marking which ones have
successfully registered.

Signed-off-by: Thierry Reding

gpu: host1x: Remove spurious tab

2018-09-26T14:09:46+00:00

All other assignments have a single space around the = sign, so remove
the spurious tab for consistency.

Signed-off-by: Thierry Reding

drivers: remove force dma flag from buses

2018-05-03T14:25:08+00:00

With each bus implementing its own DMA configuration callback, there is no
need for bus to explicitly set the force_dma flag.  Modify the
of_dma_configure function to accept an input parameter which specifies if
implicit DMA configuration is required when it is not described by the
firmware.

Signed-off-by: Nipun Gupta 
Acked-by: Bjorn Helgaas   # PCI parts
Reviewed-by: Rob Herring 
[hch: tweaked the changelog a bit]
Signed-off-by: Christoph Hellwig

dma-mapping: move dma configuration to bus infrastructure

2018-05-03T14:22:18+00:00

ACPI/OF support for configuration of DMA is a bus specific aspect, and
thus should be configured by the bus.  Introduces a 'dma_configure' bus
method so that busses can control their DMA capabilities.

Also update the PCI, Platform, ACPI and host1x buses to use the new
method.

Suggested-by: Christoph Hellwig 
Signed-off-by: Nipun Gupta 
Acked-by: Bjorn Helgaas   # PCI parts
Acked-by: Thierry Reding 
Reviewed-by: Greg Kroah-Hartman 
[hch: simplified host1x_dma_configure based on a comment from Thierry,
      rewrote changelog]
Signed-off-by: Christoph Hellwig