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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-16166121f2asm1995815c88.4.2026.10.06.17.04.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Oct 2026 17:04:24 -0700 (PDT) Message-ID: <27eafbb4-22cf-4706-b551-34c0c8d30ae2@oss.qualcomm.com> Date: Tue, 6 Oct 2026 17:04:23 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/6] zram: Add QPaCE zcomp backend To: Sergey Senozhatsky , Krzysztof Kozlowski Cc: Georgi Djakov , andersson@kernel.org, konradybcio@kernel.org, abelvesa@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, minchan@kernel.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 References: <20260930145215.3380977-1-georgi.djakov@oss.qualcomm.com> <20260930145215.3380977-5-georgi.djakov@oss.qualcomm.com> <20261001-dramatic-hasty-pug-68ebfd@quoll> Content-Language: en-US From: Oreoluwa Babatunde In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: qDCyS4v_Z2x0da0WLXMqPL7zsVQzFkR_ X-Authority-Analysis: v=2.4 cv=ZZiIpcVA c=1 sm=1 tr=0 ts=6ac58c8b cx=c_pps a=bS7HVuBVfinNPG3f6cIo3Q==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=UI1gRxWom6vz8qzGwdkA:9 a=QEXdDO2ut3YA:10 a=vBUdepa8ALXHeOFLBtFW:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA2MDA5NSBTYWx0ZWRfX4k8BVaTHcJ46 DoMQ0Qiu7hgn1hltTBFHd81TF7LGPPFyZiJ2SaHg8WFy/10eyvFqu8NyFZadViz1PNgPnbKNxPN CuZQukdVYctusrMNgSwbrHRPWhjUUIM= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA2MDA5NSBTYWx0ZWRfX01qReu93gZ/w E1G3d+cmIBeiF5evX+2L5Ux5y9J9QlXFzR9C/HIOuDYa7zwA/tSu4OdeTkiPeO1mXEbG89BX5T4 ZYzDwAb/v0EIVK5miw6bNjQcY3t+K+zCkTIiLyR6YW3BBLCykKe1ime5EmwEOsRb53qdaH5+SeT v/BX0sbmtn8jCeAUN3GmOUnPUK9/Rlpi76vAzj88PJhuFBJld6IMzbVl18mXNjv8ydJDYeFCoLD wff0sviL6HqF7gQhYrF2EhjrnBUTUYvk0WMn7BsGo38/7SdwaGS9JLrGuJe32lPiE6V0Zr490iI cQvAQvh9gXy8iSub4qnhYs7ASzR+jREjh3LAEi9jljtR9GPgNh62etfcIT39MceTNetIJP2liN+ Sci0vCRk0O5MVJRdECAm0qM2xsFZe5YneLSamRGY/OwyiRRkM57LnvjPDwZv7tjesjp1I+C9lqI 3f/EkVuQ/zQ+s/5FwsA== X-Proofpoint-ORIG-GUID: qDCyS4v_Z2x0da0WLXMqPL7zsVQzFkR_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-06_05,2026-10-06_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610060095 On 10/1/2026 3:27 AM, Sergey Senozhatsky wrote: > 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 >>> --- >>> 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. ACK Thanks, Oreoluwa