Re: [PATCH 4/6] zram: Add QPaCE zcomp backend

[Krzysztof Kozlowski]

On Wed, Sep 30, 2026 at 07:52:13AM -0700, Georgi Djakov wrote:
> Add a zcomp backend for the Qualcomm Page Compression Engine (QPaCE) so
> zram can expose qpace-lz4 as a selectable compression algorithm when the
> QPaCE driver is available.
> 
> Compress and decompress operations are handled via the QPaCE urgent
> synchronous path: each request DMA-maps the source and destination
> buffers, issues a blocking hardware command, and returns the result size.
> 
> Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxxxxxxxx>
> ---
>  drivers/block/zram/Kconfig         |  11 +++
>  drivers/block/zram/Makefile        |   1 +
>  drivers/block/zram/backend_qpace.c | 134 +++++++++++++++++++++++++++++

So entire qpace should go here, no? Why did you create this entire layer
of indirection, singleton management under drivers/soc?

>  drivers/block/zram/backend_qpace.h |  13 +++
>  drivers/block/zram/zcomp.c         |  11 ++-
>  5 files changed, 168 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/block/zram/backend_qpace.c
>  create mode 100644 drivers/block/zram/backend_qpace.h

Best regards,
Krzysztof