>> + /* We found some strange devices in HP c7000 and other platforms, they
>> + * can not be enumerated by OS, and they did DMA read/write without
>> + * driver management. if we open iommu in these platforms, the DMA
>> read/write
>> + * will be blocked by IOMMU hardware. Currently, we only create identity
>> mapping
>> + * for the devices in OS. To fix this, add iommu=pt_force=segment:busnum
>> to
>> + * force to do identity mapping for the specific bus.
>> + */
>> + if (iommu_pt_force_bus >= 0 && iommu_pt_force_bus >= 0) {
>
> iommu_pt_force_bus twice?
Sharp eyes! Sorry, it should be if (iommu_pt_force_domain >= 0 &&
iommu_pt_force_bus >= 0).
Thanks for your good catch!
Thanks!
Yijing.
>
> Thanks
> -Bharat
>
>> + int found = 0;
>> +
>> + iommu = NULL;
>> + for_each_active_iommu(iommu, drhd) {
>> + if (iommu_pt_force_domain != drhd->segment)
>> + continue;
>> +
>> + for_each_active_dev_scope(drhd->devices,
>> drhd->devices_cnt,
>> i, dev) {
>> + if (!dev_is_pci(dev))
>> + continue;
>> +
>> + pdev = to_pci_dev(dev);
>> + if (pdev->bus->number == iommu_pt_force_bus ||
>> + (pdev->subordinate
>> + && pdev->subordinate->number <=
>> iommu_pt_force_bus
>> + &&
>> pdev->subordinate->busn_res.end >=
>> iommu_pt_force_bus)) {
>> + found = 1;
>> + break;
>> + }
>> + }
>> +
>> + if (drhd->include_all) {
>> + found = 1;
>> + break;
>> + }
>> + }
>> +
>> + if (found && iommu)
>> + for (i = 0; i < 256; i++)
>> + domain_context_mapping_one(si_domain, iommu,
>> iommu_pt_force_bus,
>> + i, hw ?
>> CONTEXT_TT_PASS_THROUGH :
>> + CONTEXT_TT_MULTI_LEVEL);
>> + }
>> +
>> return 0;
>> }
>>
>> --
>> 1.7.1
>>
>> _______________________________________________
>> iommu mailing list
>> iommu@lists.linux-foundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/iommu
>
> .
>
--
Thanks!
Yijing
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