> Subject: Re: [PATCH V5 5/5] configs: imx8qm: add configuration files
>
> On 25.09.20 09:19, Jan Kiszka wrote:
> > On 22.09.20 08:45, Alice Guo wrote:
> >> + .platform_info = {
> >> + /*
> >> + * .pci_mmconfig_base is fixed; if you change it,
> >> + * update the value in mach.h
> >> + * (PCI_CFG_BASE) and regenerate the inmate library
> >> + */
> >> + .pci_mmconfig_base = 0xfd700000,
> >> + .pci_mmconfig_end_bus = 0x0,
> >> + .pci_is_virtual = 1,
> >> + .pci_domain = 0,
> >> +
> >> + .iommu_units = {
> >> + {
> >> + .type =
> JAILHOUSE_IOMMU_ARM_MMU500,
> >> + .base = 0x51400000,
> >> + .size = 0x40000,
> >> + .arm_mmu500.sid_mask = 0x7f80,
> >
> > How is the sid_mask of a platform retrieved? Can this be derived from
> > information in a normal device tree?
> >
> > Or is this coming from here:
> >
> > /* ID0 */
> > id = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_ID0); [...]
> > /* Max. number of entries we have for stream matching/indexing */ if
> > (smmu->version == ARM_SMMU_V2 && id & ARM_SMMU_ID0_EXIDS) {
> > smmu->features |= ARM_SMMU_FEAT_EXIDS;
> > size = 1 << 16;
> > } else {
> > size = 1 << FIELD_GET(ARM_SMMU_ID0_NUMSIDB, id); }
> > smmu->streamid_mask = size - 1;
> >
> > If it were so simple, I would actually say do the same in Jailhouse and
> > drop the configurable. We may even demand ARM_SMMU_ID0_EXIDS if
> that is
> > practically the only case in the field by now.
>
> This was non-sense.
>
> >
> > But I'm lacking a full picture yet.
> >
>
> Seems to be the DT property stream-match-mask. And that's unset for the
> zynqmp, so let's see how far I'll get with that.
To i.MX8QM, we need set the mask to extract the sid from bus,
otherwise smmu will not work for the client.
Regards,
Peng.
>
> Jan
>
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux
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