On 08.05.17 15:14:37, Linu Cherian wrote:
> On Sat May 06, 2017 at 12:18:44AM +0200, Robert Richter wrote:
> > On 05.05.17 17:38:06, Geetha sowjanya wrote:
> > > From: Linu Cherian <linu.cherian@xxxxxxxxxx>
> > >
> > > With implementations supporting only page 0 register space,
> > > resource size can be 64k as well and hence perform size checks
> > > based on SMMU option PAGE0_REGS_ONLY.
> > >
> > > For this, arm_smmu_device_dt_probe/acpi_probe has been moved before
> > > platform_get_resource call, so that SMMU options are set beforehand.
> > >
> > > Signed-off-by: Linu Cherian <linu.cherian@xxxxxxxxxx>
> > > Signed-off-by: Geetha Sowjanya <geethasowjanya.akula@xxxxxxxxxx>
> > > ---
> > > drivers/iommu/arm-smmu-v3.c | 26 +++++++++++++++++---------
> > > 1 file changed, 17 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> > > index 107b4a6..f027676 100644
> > > --- a/drivers/iommu/arm-smmu-v3.c
> > > +++ b/drivers/iommu/arm-smmu-v3.c
> > > @@ -2672,6 +2672,14 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
> > > return ret;
> > > }
> > >
> > > +static unsigned long arm_smmu_resource_size(struct arm_smmu_device *smmu)
> > > +{
> > > + if (ARM_SMMU_PAGE0_REGS_ONLY(smmu))
> > > + return SZ_64K;
> > > + else
> > > + return SZ_128K;
> > > +}
> > > +
> >
> > I think this can be dropped. See below.
> >
> > > static int arm_smmu_device_probe(struct platform_device *pdev)
> > > {
> > > int irq, ret;
> > > @@ -2688,9 +2696,17 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
> > > }
> > > smmu->dev = dev;
> > >
> > > + if (dev->of_node) {
> > > + ret = arm_smmu_device_dt_probe(pdev, smmu);
> > > + } else {
> > > + ret = arm_smmu_device_acpi_probe(pdev, smmu);
> > > + if (ret == -ENODEV)
> > > + return ret;
> > > + }
> > > +
> > > /* Base address */
> > > res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > - if (resource_size(res) + 1 < SZ_128K) {
> > > + if (resource_size(res) + 1 < arm_smmu_resource_size(smmu)) {
> > > dev_err(dev, "MMIO region too small (%pr)\n", res);
> > > return -EINVAL;
> > > }
> >
> > Why not just do the follwoing here:
> >
> > /* Base address */
> > res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > if (resource_size(res) + 1 < arm_smmu_resource_size(smmu)) {
> > dev_err(dev, "MMIO region too small (%pr)\n", res);
> > return -EINVAL;
> > }
> > ioaddr = res->start;
> >
> > + /*
> > + * Override the size, for Cavium ThunderX2 implementation
> > + * which doesn't support the page 1 SMMU register space.
> > + */
> > + if (smmu->options & ARM_SMMU_OPT_PAGE0_REGS_ONLY)
> > + res->end = res->size + SZ_64K -1;
> > +
> > smmu->base = devm_ioremap_resource(dev, res);
> > if (IS_ERR(smmu->base))
> > return PTR_ERR(smmu->base);
>
>
> This might not work, since platform_device_add is being called from
> iort.c before the res->end gets fixed up here.
It should. You added it with 128k and you get it back with
platform_get_resource(), but before ioremap you shrink the size to
64k.
-Robert
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