419a154dbe
The issue that userspace needed to solve is that there is ~two orders of
magnitude size difference in cmdstream buffers (both for gmem commands
and for draw commands), and that the previous practice of allocating
worst-case sizes is quite wasteful. Previously a submit would be
constructed (for example) like:
CMD TARGET DESCRIPTION
g0 N gmem/tiling commands
b0 Y binning commands
d0 Y draw commands
Which, after the one non-IB-target cmd buffer is inserted into the
kernel controlled ringbuffer, looks like (not to scale):
b0: d0:
+-----+ +-----+
IB1 | ... | | ... |
+-----+ +-----+
^ ^
| |
+-----+ +-+---------+
g0: | | |
+----+----+----+----+----+----+----
IB0 | .. | IB | .. | IB | .. | IB | ...
+----+----+----+----+----+----+----
^ tile0 tile1
|
+-----------+
userspace |
~~~~~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel |
----+----+----
ringbuffer ... | IB | ...
----+----+----
Now, multiple physical cmdstream buffers per fd_ringbuffer are supported,
so this becomes:
CMD TARGET DESCRIPTION
g0 N
... N gmem/tiling commands
gN N
b0 Y
... Y binning commands
bN Y
d0 Y
... Y draw commands
dN Y
Which, after the non-IB-target cmd buffers (g0..gN) are inserted into
the kernel controlled ringbuffer, looks like:
b0: b1 d0: d1
+-----+ +-----+ +-----+ +-----+
IB1 | ... | | ... | ... | ... | | ... | ...
+-----+ +-----+ +-----+ +-----+
^ ^ ^ ^
| | | |
| +-+ | +-----+------+
+-----+ | | | |
| | +--+----------+ |
g0: | | | | | |
+----+----+----+----+----+----+---+----+----+----
IB0 | .. | IB | IB | .. | IB | IB |.. | IB | IB |...
+----+----+----+----+----+----+---+----+----+----
^ tile0 tile1
| to b0 to b1
| | | to|d0 to|d1
| | +----+ | +-+-----------+
| | | | | |
| +------+ | +-+-------------+ |
| g1: | | | | | |
| +----+----+----+----+----+----+---+----+----+----
IB0 | | .. | IB | IB | .. | IB | IB |.. | IB | IB |...
| +----+----+----+----+----+----+---+----+----+----
| ^ tileX tileY
| |
| +-----------+
+-----------+ |
userspace | |
~~~~~~~~~~~~~~~~~~~|~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel | |
----+----+----+----
ringbuffer ... | IB | IB | ...
----+----+----+----
Signed-off-by: Rob Clark <robclark@freedesktop.org>
|
||
|---|---|---|
| .. | ||
| msm_bo.c | ||
| msm_device.c | ||
| msm_drm.h | ||
| msm_pipe.c | ||
| msm_priv.h | ||
| msm_ringbuffer.c | ||