linux-kernel - Re: [PATCH 2/2] PCI: mvebu: Check DRAM window size

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Message-ID: <20171005211650.GZ25517@bhelgaas-glaptop.roam.corp.google.com>
Date:   Thu, 5 Oct 2017 16:16:50 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jan Luebbe <jlu@...gutronix.de>
Cc:     Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Andrew Lunn <andrew@...n.ch>,
        Jason Cooper <jason@...edaemon.net>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] PCI: mvebu: Check DRAM window size

On Mon, Sep 25, 2017 at 06:56:58PM -0500, Bjorn Helgaas wrote:
> On Mon, Aug 28, 2017 at 05:25:17PM +0200, Jan Luebbe wrote:
> > The sum of the DRAM windows may exceed 4GB (at least on Armada XP).
> > Return an error in that case.
> > 
> > Signed-off-by: Jan Luebbe <jlu@...gutronix.de>
> 
> Looking for an ack from Thomas or Jason before applying this...

Ping, I think I'm stil waiting for an ack for this.  Or did I miss it?

> > ---
> >  drivers/pci/host/pci-mvebu.c | 27 ++++++++++++++++++++++-----
> >  1 file changed, 22 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
> > index f353a6eb2f01..5d74af81d104 100644
> > --- a/drivers/pci/host/pci-mvebu.c
> > +++ b/drivers/pci/host/pci-mvebu.c
> > @@ -206,10 +206,10 @@ static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr)
> >   * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
> >   * WIN[0-3] -> DRAM bank[0-3]
> >   */
> > -static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
> > +static int mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
> >  {
> >  	const struct mbus_dram_target_info *dram;
> > -	u32 size;
> > +	u64 size;
> >  	int i;
> >  
> >  	dram = mv_mbus_dram_info();
> > @@ -252,19 +252,32 @@ static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
> >  	if ((size & (size - 1)) != 0)
> >  		size = 1 << fls(size);
> >  
> > +	if (size > 0x100000000) {
> > +		dev_err(&port->pcie->pdev->dev,
> > +			"Could not configure DRAM window (too large): 0x%llx\n",
> > +			size);
> > +
> > +		return -EINVAL;
> > +	}
> > +
> >  	/* Setup BAR[1] to all DRAM banks. */
> >  	mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1));
> >  	mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1));
> >  	mvebu_writel(port, ((size - 1) & 0xffff0000) | 1,
> >  		     PCIE_BAR_CTRL_OFF(1));
> > +
> > +	return 0;
> >  }
> >  
> > -static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
> > +static int mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
> >  {
> >  	u32 cmd, mask;
> > +	int ret;
> >  
> >  	/* Point PCIe unit MBUS decode windows to DRAM space. */
> > -	mvebu_pcie_setup_wins(port);
> > +	ret = mvebu_pcie_setup_wins(port);
> > +	if (ret)
> > +		return ret;
> >  
> >  	/* Master + slave enable. */
> >  	cmd = mvebu_readl(port, PCIE_CMD_OFF);
> > @@ -277,6 +290,8 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
> >  	mask = mvebu_readl(port, PCIE_MASK_OFF);
> >  	mask |= PCIE_MASK_ENABLE_INTS;
> >  	mvebu_writel(port, mask, PCIE_MASK_OFF);
> > +
> > +	return 0;
> >  }
> >  
> >  static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> > @@ -882,7 +897,9 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
> >  
> >  		if (!port->base)
> >  			continue;
> > -		mvebu_pcie_setup_hw(port);
> > +		err = mvebu_pcie_setup_hw(port);
> > +		if (err)
> > +			return 0;
> >  	}
> >  
> >  	return 1;
> > -- 
> > 2.11.0
> > 
> 
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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