Hi Greg,
On 2020-09-22 15:16, Robin Murphy wrote:
Hi all,
Here's a quick v2 with the tags so far picked up and some inline
commentary about the shareability domains for the pagetable code.
Robin.
Robin Murphy (3):
iommu/io-pgtable-arm: Support coherency for Mali LPAE
drm/panfrost: Support cache-coherent integrations
arm64: dts: meson: Describe G12b GPU as coherent
Please would you consider applying these patches to 5.10 stable? The
mainline commit IDs are now:
728da60da7c1 iommu/io-pgtable-arm: Support coherency for Mali LPAE
268af50f38b1 drm/panfrost: Support cache-coherent integrations
03544505cb10 arm64: dts: meson: Describe G12b GPU as coherent
and I've checked that they cherry-pick to the current 5.10.y branch
(5.10.12) cleanly.
Amlogic-based boards that require this support are quite popular, and
end-users are now starting to run into the weird behaviour that ensues
without it, which is all to easy to misattribute to the userspace driver
in Mesa, e.g. [1],[2]. Fortunately 5.10 also happens to be the first
kernel version to start probing the particular GPU models on these SoCs
anyway, and I'm not aware of any other significant systems that are
affected, so I don't believe we will need to worry about any other
stable versions.
Thanks,
Robin.
[1] https://gitlab.freedesktop.org/mesa/mesa/-/issues/4157
[2] https://gitlab.freedesktop.org/mesa/mesa/-/issues/4160
arch/arm64/boot/dts/amlogic/meson-g12b.dtsi | 4 ++++
drivers/gpu/drm/panfrost/panfrost_device.h | 1 +
drivers/gpu/drm/panfrost/panfrost_drv.c | 2 ++
drivers/gpu/drm/panfrost/panfrost_gem.c | 2 ++
drivers/gpu/drm/panfrost/panfrost_mmu.c | 1 +
drivers/iommu/io-pgtable-arm.c | 11 ++++++++++-
6 files changed, 20 insertions(+), 1 deletion(-)
