linux-kernel - Re: [PATCH v4 3/3] mtd: rawnand: qcom: Add support for secure regions in NAND memory

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Message-ID: <20210308133410.GD5457@thinkpad>
Date:   Mon, 8 Mar 2021 19:04:10 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        robh+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Daniele.Palmas@...it.com,
        bjorn.andersson@...aro.org
Subject: Re: [PATCH v4 3/3] mtd: rawnand: qcom: Add support for secure
 regions in NAND memory

On Mon, Mar 08, 2021 at 10:02:47AM +0100, Boris Brezillon wrote:
> On Mon,  8 Mar 2021 11:14:47 +0530
> Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> wrote:
> 

[...]

> >  /* helper to configure address register values */
> > -static void set_address(struct qcom_nand_host *host, u16 column, int page)
> > +static int set_address(struct qcom_nand_host *host, u16 column, int page)
> >  {
> >  	struct nand_chip *chip = &host->chip;
> >  	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
> > +	u32 offs = page << chip->page_shift;
> > +	int i, j;
> > +
> > +	/* Skip touching the secure regions if present */
> > +	for (i = 0, j = 0; i < host->nr_sec_regions; i++, j += 2) {
> > +		if (offs >= host->sec_regions[j] &&
> > +		    (offs <= host->sec_regions[j] + host->sec_regions[j + 1]))
> > +			return -EIO;
> > +	}
> 
> Hm, not sure that's a good idea to make this check part of
> set_address(). Looks like set_address() can be used for ONFI page
> access too, and you definitely don't want to block those
> requests. I'd recommend having a separate helper that you can call from
> qcom_nandc_{read,write}_{oob,page,page_raw}().
> 

Right but I went for the code simplicity :/ Anyway, since you're favoring
towards moving this check into code, I'll incorporate your suggestion
accordingly.

Thanks,
Mani