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arc=none smtp.client-ip=217.70.183.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="Cp8Anbs3" Received: by mail.gandi.net (Postfix) with ESMTPSA id CC69E4399F; Fri, 16 May 2025 14:06:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1747404403; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7FNaCT4ZQwywoNYi1aikoPuxQeiAAAtXSDPCSbSoQYY=; b=Cp8Anbs3tIhc8FvhUb0RNthAJPHEeUjwx9VmSb6FIaINNL81nGtSTJ188OY96x8D3KpVwH eM/Vy69l9h8+IzytTJXijZyRXmmNcrexqy4isLI0OWbCzE8ED6/q5/jsX6aqNlJTycUNig zJLld6lvyiRe8joEgtGWc2uioTw3gI0ICoojca399xh/ruR4NcfgyNBo07uCBe0q2BJ0nj uQ/g+Q3Y/3sy+gdC63lTh6B00vDYFTGzAbuzgTPo+OB0ghdspBOJPByuJqiKGBp3Qhi8K5 4mRBlYxsqTx3CK1vooo5+H0InweCrOfay/P4VPAUadkU3VY3kJ0/wzqWKAf8Rg== From: Miquel Raynal To: "Mahapatra, Amit Kumar" Cc: "richard@nod.at" , "vigneshr@ti.com" , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "git (AMD-Xilinx)" , "amitrkcian2002@gmail.com" , Bernhard Frauendienst Subject: Re: [PATCH v12 3/3] mtd: Add driver for concatenating devices In-Reply-To: (Amit Kumar Mahapatra's message of "Tue, 13 May 2025 14:45:39 +0000") References: <20250205133730.273985-1-amit.kumar-mahapatra@amd.com> <20250205133730.273985-4-amit.kumar-mahapatra@amd.com> <8734fa8hed.fsf@bootlin.com> <87o6vyjgfl.fsf@bootlin.com> User-Agent: mu4e 1.12.7; emacs 29.4 Date: Fri, 16 May 2025 16:06:41 +0200 Message-ID: <87o6vsejke.fsf@bootlin.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdefuddvleegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufgjfhgffffkgggtgfesthhqredttderjeenucfhrhhomhepofhiqhhuvghlucftrgihnhgrlhcuoehmihhquhgvlhdrrhgrhihnrghlsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeffgefhjedtfeeigeduudekudejkedtiefhleelueeiueevheekvdeludehiedvfeenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplhhotggrlhhhohhsthdpmhgrihhlfhhrohhmpehmihhquhgvlhdrrhgrhihnrghlsegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopeduvddprhgtphhtthhopegrmhhithdrkhhumhgrrhdqmhgrhhgrphgrthhrrgesrghmugdrtghomhdprhgtphhtthhopehrihgthhgrrhgusehnohgurdgrthdprhgtphhtthhopehvihhgnhgvshhhrhesthhirdgtohhmpdhrtghpthhtoheprhhosghhsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehkrhiikhdoughtsehkvghrnhgvlhdrohhrghdprhgtphhtthhopegtohhnohhrodgutheskhgvr hhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqmhhtugeslhhishhtshdrihhnfhhrrgguvggrugdrohhrghdprhgtphhtthhopeguvghvihgtvghtrhgvvgesvhhgvghrrdhkvghrnhgvlhdrohhrgh X-GND-Sasl: miquel.raynal@bootlin.com On 13/05/2025 at 14:45:39 GMT, "Mahapatra, Amit Kumar" wrote: > [AMD Official Use Only - AMD Internal Distribution Only] > > Hello Miquel, > >> >> > + mtd->dev.parent =3D concat->subdev[0]->dev.parent; >> >> > + mtd->dev =3D concat->subdev[0]->dev; >> >> > + >> >> > + /* Register the platform device */ >> >> > + ret =3D mtd_device_register(mtd, NULL, 0); >> >> > + if (ret) >> >> > + goto destroy_concat; >> >> > + } >> >> > + >> >> > + return 0; >> >> > + >> >> > +destroy_concat: >> >> > + mtd_concat_destroy(mtd); >> >> > + >> >> > + return ret; >> >> > +} >> >> > + >> >> > +late_initcall(mtd_virt_concat_create_join); >> >> >> >> The current implementation does not support probe deferrals, I >> >> believe it should be handled. >> > >> > I see that the parse_mtd_partitions() API can return -EPROBE_DEFER >> > during MTD device registration, but this behavior is specific to the >> > parse_qcomsmem_part parser. None of the other parsers appear to >> > support probe deferral. As discussed in RFC [1], the virtual concat >> > feature is purely a fixed-partition capability, and based on my >> > understanding, the fixed-partition parser does not support probe defer= ral. >> > Please let me know if you can think of any other probe deferral >> > scenarios that might impact the virtual concat driver. >> >> That's true, but I kind of dislike the late_initcall, I fear it might br= eak in creative ways. > > I understand, but since we require the partition information to be > available, late_initcall seems to be the most suitable choice among the > initcall levels=E2=80=94if we decide to proceed with using an initcall. > Regarding potential failures, as far as I can tell, the operation would > fail if, at the time of concatenation, one or more of the MTD devices > involved in the concat are not yet available. In such a scenario, we can > issue a kernel warning and exit gracefully. But, However, if you prefer > to move away from using initcalls and have an alternative > implementation approach in mind, please let us know. I am sorry but this does not work with modules, and we cannot ignore this case I believe. More specifically, if a controller probe is deferred (with EPROBE_DEFER or just prevented because some dependencies are not yet satisfied), you'll get incorrectly defined mtd devices. Thanks, Miqu=C3=A8l