Currently Ubuntu kernel has this kernel config disabled.
But in some cases, Intel's Sapphire Rapids High Bandwith
Memory (SPR-HBM) needs this option.
Memory bandwidth has been a bottleneck of increasingly memory bound
workloads. Sapphire Rapids plus HBM is specifically targeted to
cater to these workloads, traditionally served using overprovisioning
of memory devices.
Signed-off-by: Michael Reed <email address hidden>
The '|=' update operator for merging dicts is available starting in
python 3.9 however in focal we have python 3.8, which causes the
annotation parsing script to crash.
Support also the old way of merging dicts available since python 3.5
that uses dict unpacking, e.g. dict1 = {**dict1, **dict2}
Signed-off-by: Luke Nowakowski-Krijger <email address hidden>
Signed-off-by: Andrea Righi <email address hidden>
Acked-by: Tim Gardner <email address hidden>
Acked-by: Luke Nowakowski-Krijger <email address hidden>
Signed-off-by: Luke Nowakowski-Krijger <email address hidden>
Currently we are observing occasionally display flickering or complete
freeze. This is narrowed down to be caused by single full frame update
(SFF).
SFF bit after it's written gets cleared by HW in subsequent vblank
i.e. when the update is sent to the panel. SFF bit is required to be
written together with partial frame update (PFU) bit. After the SFF
bit gets cleared by the HW psr2 man trk ctl register still contains
PFU bit. If there is subsequent update for any reason we will end up
having selective update/fetch configuration where start line is 0 and
end line is 0. Also selective fetch configuration for the planes is
not properly performed. This seems to be causing problems with some
panels.
Using CFF without SFF doesn't work either because it may happen that
psr2 man track ctl register is overwritten by next update before
vblank triggers sending the update. This is causing problems to
psr_invalidate/flush. Using CFF and SFF together solves the problems
as SFF is cleared only by HW in subsequent vblank and the update gets
sent.
Fix the flickering/freeze issue by keeping CFF bit as set when PSR2 is
enabled unless there is a properly configured selective update via
atomic commit.
v2:
- Improve commit message and comments
- No functional changes
This is also workaround for HSD 14014971508
Cc: Ville Syrjälä <email address hidden>
Cc: José Roberto de Souza <email address hidden>
Cc: Mika Kahola <email address hidden>
Reported-by: Lee Shawn C <email address hidden>
Signed-off-by: Jouni Högander <email address hidden>
Tested-by: Lee Shawn C <email address hidden>
Signed-off-by: Stanislav Lisovskiy <email address hidden>
Link: https://patchwork.freedesktop<email address hidden>
(backported from commit 084aab04cc60e5eab32287d0483c33e12c92da87)
[Chris: fix the cherry-pick failure due to the mismatched work around
name in the comment description]
Signed-off-by: Chris Chiu <email address hidden>
Acked-by: Andrei Gherzan <email address hidden>
Acked-by: Stefan Bader <email address hidden>
Acked-by: Roxana Nicolescu <email address hidden>
Signed-off-by: Roxana Nicolescu <email address hidden>
After enabling Rust in the kernel, the size of linux-headers increased
consistently.
Some work has been done to reduce the size, such as dropping the binary
artifacts (*.o and *.cmd), but it would be nice to keep the size of
linux-headers reasonably small to avoid wasting too much space in the
cloud images.
For this reason introduce a new package linux-lib-rust to ship all the
Rust headers and libraries required to build out-of-tree kernel modules
in Rust.
Before this patch: 96M /usr/src/linux-headers-6.2.0-21-generic
After this patch: 29M /usr/src/linux-headers-6.2.0-21-generic
Signed-off-by: Andrea Righi <email address hidden>
Acked-by: Luke Nowakowski-Krijger <email address hidden>
Acked-by: Tim Gardner <email address hidden>
Signed-off-by: Stefan Bader <email address hidden>
0f53fc7...
by
=?utf-8?b?VmlsbGUgU3lyasOkbMOk?= <email address hidden>
drm/i915: Explain the magic numbers for AUX SYNC/precharge length
