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SubjectRe: [RFC PATCH 05/10] iommu/vt-d: Setup DMA remapping for mediated devices
From
Date
Hi,

On 07/23/2018 12:44 PM, Liu, Yi L wrote:
>> From: Lu Baolu [mailto:baolu.lu@linux.intel.com]
>> Sent: Sunday, July 22, 2018 2:09 PM
>>
>> This configures the second level page table when external components request to
>> allocate a domain for a mediated device.
> I think it should be the time when adding a mediate device to the domain.

You are right. Will correct it.

>
>> Cc: Ashok Raj <ashok.raj@intel.com>
>> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
>> Cc: Kevin Tian <kevin.tian@intel.com>
>> Cc: Liu Yi L <yi.l.liu@intel.com>
>> Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
>> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
>> ---
>> drivers/iommu/intel-iommu.c | 73
>> ++++++++++++++++++++++++++++++++++++++++-----
>> 1 file changed, 66 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index
>> 57ccfc4..b6e9ea8 100644
>> --- a/drivers/iommu/intel-iommu.c
>> +++ b/drivers/iommu/intel-iommu.c
>> @@ -2569,8 +2569,9 @@ static struct dmar_domain
>> *dmar_insert_one_dev_info(struct intel_iommu *iommu,
>> if (dev)
>> dev->archdata.iommu = info;
>>
>> - if (dev && dev_is_pci(dev) && sm_supported(iommu)) {
>> - bool pass_through;
>> + if (dev && sm_supported(iommu)) {
>> + bool pass_through = hw_pass_through &&
>> + domain_type_is_si(domain);
>>
>> ret = intel_pasid_alloc_table(dev);
>> if (ret) {
>> @@ -2579,12 +2580,21 @@ static struct dmar_domain
>> *dmar_insert_one_dev_info(struct intel_iommu *iommu,
>> return NULL;
>> }
>>
>> - /* Setup the PASID entry for requests without PASID: */
>> - pass_through = hw_pass_through && domain_type_is_si(domain);
>> spin_lock(&iommu->lock);
>> - intel_pasid_setup_second_level(iommu, domain, dev,
>> - PASID_RID2PASID,
>> - pass_through);
>> +
>> + /* Setup the PASID entry for requests without PASID: */
>> + if (dev_is_pci(dev))
>> + intel_pasid_setup_second_level(iommu, domain, dev,
>> + PASID_RID2PASID,
> can domain->default_pasid be initialized to be PASID_RID2PASID if the domain
> is not a domain used by mediated device?

PASID_RID2PASID is 0 as well.


>
>> + pass_through);
>> + /* Setup the PASID entry for mediated devices: */
>> + else if (dev_is_mdev(dev))
>> + intel_pasid_setup_second_level(iommu, domain, dev,
>> + domain->default_pasid,
>> + false);
>> + else
>> + pr_err("Unsupported device %s\n", dev_name(dev));
>> +
>> spin_unlock(&iommu->lock);
>> }
>> spin_unlock_irqrestore(&device_domain_lock, flags); @@ -4937,6 +4947,32
>> @@ static void domain_context_clear(struct intel_iommu *iommu, struct device
>> *dev)
>> pci_for_each_dma_alias(to_pci_dev(dev), &domain_context_clear_one_cb,
>> iommu); }
>>
>> +static void
>> +iommu_flush_ext_iotlb(struct intel_iommu *iommu, u16 did, u32 pasid,
> Per latest VT-d spec, its new name is pasid-based-iotlb. Pls update the naming
> accordingly. :)

Okay.

Best regards,
Lu Baolu

>
> Regards,
> Yi Liu
>
>> +u64 gran) {
>> + struct qi_desc desc;
>> +
>> + desc.high = 0;
>> + desc.low = QI_EIOTLB_PASID(pasid) | QI_EIOTLB_DID(did) |
>> + QI_EIOTLB_GRAN(gran) | QI_EIOTLB_TYPE;
>> +
>> + qi_submit_sync(&desc, iommu);
>> +}
>> +
>> +static void iommu_flush_pasid_dev_iotlb(struct intel_iommu *iommu,
>> + struct device *dev, int sid, int pasid) {
>> + struct qi_desc desc;
>> + struct pci_dev *pdev = to_pci_dev(dev);
>> + int qdep = pci_ats_queue_depth(pdev);
>> +
>> + desc.low = QI_DEV_EIOTLB_PASID(pasid) | QI_DEV_EIOTLB_SID(sid) |
>> + QI_DEV_EIOTLB_QDEP(qdep) | QI_DEIOTLB_TYPE;
>> + desc.high = QI_DEV_EIOTLB_ADDR(-1ULL >> 1) | QI_DEV_EIOTLB_SIZE;
>> +
>> + qi_submit_sync(&desc, iommu);
>> +}
>> +
>> static void __dmar_remove_one_dev_info(struct device_domain_info *info) {
>> struct intel_iommu *iommu;
>> @@ -4949,6 +4985,29 @@ static void __dmar_remove_one_dev_info(struct
>> device_domain_info *info)
>>
>> iommu = info->iommu;
>>
>> + if (dev_is_mdev(info->dev)) {
>> + struct dmar_domain *domain = info->domain;
>> + int did = domain->iommu_did[iommu->seq_id];
>> + int sid = info->bus << 8 | info->devfn;
>> + struct device *dev = info->dev;
>> +
>> + intel_pasid_clear_entry(dev, domain->default_pasid);
>> +
>> + /* Flush IOTLB including PASID Cache: */
>> + iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH);
>> +
>> + /*
>> + * Flush EIOTLB. The only way to flush global mappings within
>> + * a PASID is to use QI_GRAN_ALL_ALL.
>> + */
>> + iommu_flush_ext_iotlb(iommu, did, domain->default_pasid,
>> + QI_GRAN_ALL_ALL);
>> +
>> + /* Flush Dev TLB: */
>> + iommu_flush_pasid_dev_iotlb(iommu, dev_mdev_parent(dev), sid,
>> + domain->default_pasid);
>> + }
>> +
>> if (info->dev) {
>> iommu_disable_dev_iotlb(info);
>> domain_context_clear(iommu, info->dev);
>> --
>> 2.7.4
>

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