Hi.
On Fri, Sep 2, 2011 at 10:56 PM, Marek Szyprowski
<m.szyprowski@xxxxxxxxxxx> wrote:
> + *
> + * iova must be aligned on a 4kB, 64kB, 1MB and 16MB boundaries, respectively.
> + */
Actually, iova is just needed to be aligned by 4KiB because it is
minimum requirement.
I think IOMMU driver is capable of mapping a group of page frames that
is aligned
by 1MiB with an iova that is aligned by 4KB
if the iova is large enough to map the given page frames.
> +static int s5p_sysmmu_map(struct iommu_domain *domain, unsigned long iova,
> + phys_addr_t paddr, int gfp_order, int prot)
> +{
> + struct s5p_sysmmu_domain *s5p_domain = domain->priv;
> + int flpt_idx = flpt_index(iova);
> + size_t len = 0x1000UL << gfp_order;
> + void *flpt_va, *slpt_va;
> +
> + if (len != SZ_16M && len != SZ_1M && len != SZ_64K && len != SZ_4K) {
> + sysmmu_debug(3, "bad order: %d\n", gfp_order);
> + return -EINVAL;
> + }
Likewise, I think this driver need to support mapping 128KiB aligned,
128KiB physical memory, for example.
Otherwise, it is somewhat restrictive than we expect.
Thank you.
Cho KyongHo.
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