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

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Date:   Mon, 8 Mar 2021 19:04:52 +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 07:04:17PM +0530, Manivannan Sadhasivam wrote:
> 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

s/code/core

> accordingly.
> 
> Thanks,
> Mani