From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Georgi Djakov <georgi.djakov@oss.qualcomm.com>,
andersson@kernel.org, konradybcio@kernel.org,
abelvesa@kernel.org, robh@kernel.org, krzk+dt@kernel.org,
conor+dt@kernel.org, minchan@kernel.org,
senozhatsky@chromium.org, axboe@kernel.dk, rostedt@goodmis.org,
mhiramat@kernel.org, mathieu.desnoyers@efficios.com,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-trace-kernel@vger.kernel.org, djakov@kernel.org
Subject: Re: [PATCH 4/6] zram: Add QPaCE zcomp backend
Date: Thu, 1 Oct 2026 19:27:34 +0900 [thread overview]
Message-ID: <ar4070oH8lRCJMRw@google.com> (raw)
In-Reply-To: <20261001-dramatic-hasty-pug-68ebfd@quoll>
On (26/10/01 10:51), Krzysztof Kozlowski wrote:
> 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@oss.qualcomm.com>
> > ---
> > 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?
qpace seems to be standalone/independent arch/soc specific, and can gain
users outside of zram (fs compression, zswap, etc.). zram's backends
potentially can disappear all together, if we switch to acomp crypto API.
next prev parent reply other threads:[~2026-10-01 10:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 14:52 [PATCH 0/6] soc: qcom: Add Qualcomm Page Compression Engine (QPaCE) driver Georgi Djakov
2026-09-30 14:52 ` [PATCH 1/6] dt-bindings: soc: qcom: Add QPaCE binding Georgi Djakov
2026-10-02 6:10 ` Krzysztof Kozlowski
2026-09-30 14:52 ` [PATCH 2/6] soc: qcom: qpace: Add Qualcomm Page Compression Engine driver Georgi Djakov
2026-10-01 8:50 ` Krzysztof Kozlowski
2026-09-30 14:52 ` [PATCH 3/6] trace: qpace: Add tracepoints for QPaCE operations Georgi Djakov
2026-09-30 14:52 ` [PATCH 4/6] zram: Add QPaCE zcomp backend Georgi Djakov
2026-10-01 5:43 ` Sergey Senozhatsky
2026-10-01 8:51 ` Krzysztof Kozlowski
2026-10-01 10:27 ` Sergey Senozhatsky [this message]
2026-09-30 14:52 ` [PATCH 5/6] soc: qcom: qpace: Add LLCC slice support Georgi Djakov
2026-09-30 14:52 ` [PATCH 6/6] arm64: dts: qcom: hawi: Add QPaCE DT node Georgi Djakov
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