Padded counts are numbers of the form:
n = (2k + 1) * 2^s
for k, s integers. Rather than explicitly store k and s separately and
then compute this formula on demand, it's much cleaner to store the
padded number itself, which is what you manipulate most of the time.
When you do need k,s it is easy to factor by noticing the bitwise
representation:
s = ctz(n)
k = n >> (s + 1)
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
The algorithm doesn't need to be tangled up in details about the
attribute records themselves. We'll need to compute magic divisors for
gl_InstanceID in a second.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
gcc generates exceptionally bad code for panfrost_pack_work_groups_fused
otherwise ... although that routine is somehow still hot ...
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3067>
The algorithm is as described. Nothing fancy here, just need to add some
new code paths depending on which model we're running on.
Tomeu:
- Also disable tiling when !hierarchy and !vertex_count
- Avoid creating polygon lists smaller than the minimum when
vertex_count > 0 but tile size smaller than 16 byte
- Take into account tile size when calculating polygon list size for
!hierarchy
- Allow 0-sized tiles in a single dimension
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
We've figured out most of the big pieces, and though it looks faintly
like other Midgards, it's much simpler.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
While the algorithm for computing the header size has been correct for a
while, we used a major hack to conservatively guess the body size. Let's
scrap that and figure out the algorithm we actually need to use to be
bit-identical with what the hardware expects.
We do have to be careful to add the header size to total comptued BO
size.
It's not clear how big the polygon list needs to be in practice -- but
it has to be somewhat bigger than the polygon list itself. This needs
more investigation. If we size the polygon list exactly based on the
polygon_list_size field, we get faults like:
[ 1224.219886] panfrost ff9a0000.gpu: Unhandled Page fault in AS0 at VA 0x000000001BDE8000
Reason: TODO
raw fault status: 0x660003C3
decoded fault status: SLAVE FAULT
exception type 0xC3: TRANSLATION_FAULT_LEVEL3
access type 0x3: WRITE
source id 0x6600
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This is a blob quirk; in so much as I know, the hardware doesn't care.
But we're trying to be bit-identical to take as much entropy out of
traces as possible, so let's introduce the quirk.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
The routines in this file have no dependency on Gallium. Let's share
them so they can be used for a theoretical future Vulkan driver or, more
immediately, consulted when tracing.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
