On 15.09.2021 15:37, Roman Skakun wrote:

quoted

quoted

From: Roman Skakun <redacted>

It is possible when default IO TLB size is not
enough to fit a long buffers as described here [1].

This patch makes a way to set this parameter
using cmdline instead of recompiling a kernel.

[1] https://www.xilinx.com/support/answers/72694.html

 I'm not convinced the swiotlb use describe there falls under "intended
 use" - mapping a 1280x720 framebuffer in a single chunk?

I had the same issue while mapping DMA chuck ~4MB for gem fb when
using xen vdispl.
I got the next log:
[ 142.030421] rcar-fcp fea2f000.fcp: swiotlb buffer is full (sz:
3686400 bytes), total 32768 (slots), used 32 (slots)

It happened when I tried to map bounce buffer, which has a large size.
The default size if 128(IO_TLB_SEGSIZE) * 2048(IO_TLB_SHIFT) = 262144
bytes, but we requested 3686400 bytes.
When I change IO_TLB_SEGSIZE to 2048. (2048(IO_TLB_SEGSIZE)  *
2048(IO_TLB_SHIFT) = 4194304bytes).
It makes possible to retrieve a bounce buffer for requested size.
After changing this value, the problem is gone.

But the question remains: Why does the framebuffer need to be mapped
in a single giant chunk?

quoted

 In order to be sure to catch all uses like this one (including ones
 which make it upstream in parallel to yours), I think you will want
 to rename the original IO_TLB_SEGSIZE to e.g. IO_TLB_DEFAULT_SEGSIZE.

I don't understand your point. Can you clarify this?

There's a concrete present example: I have a patch pending adding
another use of IO_TLB_SEGSIZE. This use would need to be replaced
like you do here in several places. The need for the additional
replacement would be quite obvious (from a build failure) if you
renamed the manifest constant. Without renaming, it'll take
someone running into an issue on a live system, which I consider
far worse. This is because a simple re-basing of one of the
patches on top of the other will not point out the need for the
extra replacement, nor would a test build (with both patches in
place).

Jan