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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: devicetree@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-Spam-Info: AW1haW4tMjYxMDA2MDA5NSBTYWx0ZWRfX0BCurCw6yOUi uePPZDaMjiOtPZeLqRJpphp80jIJ12G8gL00tTB7gfdETtTI01Hwsf/Z/S1NEGe63AE7nbSoIaR 6eC+wEddBbnSvimwq0HcCbLirKj0haY= X-Authority-Analysis: v=2.4 cv=FpSQbGrq c=1 sm=1 tr=0 ts=6ac58c8a cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=UI1gRxWom6vz8qzGwdkA:9 a=QEXdDO2ut3YA:10 a=PxkB5W3o20Ba91AHUih5:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA2MDA5NSBTYWx0ZWRfX+3CoMzimrcJC lnEAJrL4N7Osq3sjFPAUKDIEOTobSdUMGi2uXsovgO9VlzF+y+YrmK6bbi+eSmc1uIbIc5q21/n SrmpcnskGSoTXM5Wu5s2Rtzn71klFHUVag2ux5KYh04YyblU8fB4GXgmepgI8mz9GuB3pExl4vI UkYmb8ym6pyTF6/zb3I/IfJXHxD53OSOjPVpsvUAf7IvJxWTJ4eGI3W72rOl4FggfCaX08zSw53 kmZy2wRAGKRYKKJOhNj9V6N1XESetreyWYF+d0TUfU2FmNP95ool28/l8qEmRXFFNkVdnoHLCmC VUuZwzsFGUdLs+HyUl99qHYqCTs172vxQQAPoSggRPd/IXC/B4qdm1tujzZMwTswsCxkQ+fB37E gVxyy2lqd8xtUYd6Tjhu9FXI5tna30OEHFVfQqzfRvbzMuQjiIupr3ot2Kc5zDhp3k1U2N1bTi2 pWNadOfeKFxsKoI/89Q== X-Proofpoint-ORIG-GUID: _Q6j02eqVPjSlBvAXaDaOx-lT6_OIeiW X-Proofpoint-GUID: _Q6j02eqVPjSlBvAXaDaOx-lT6_OIeiW 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 priorityscore=1501 bulkscore=0 suspectscore=0 clxscore=1015 impostorscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 adultscore=0 spamscore=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