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SubjectRe: [PATCH 6/9] iommu/vt-d: Allocate and free pasid table
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Hi,

On 05/01/2018 05:22 PM, Liu, Yi L wrote:
>> From: Lu Baolu [mailto:baolu.lu@linux.intel.com]
>> Sent: Tuesday, April 17, 2018 11:03 AM
>>
>> This patch allocates PASID table for a domain at the time when
>> it is being created (if any devices using this domain supports
>> PASID feature), and free it when the domain is freed.
>>
>> 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: Lu Baolu <baolu.lu@linux.intel.com>
>> ---
>> drivers/iommu/intel-iommu.c | 13 +++++++++++++
>> drivers/iommu/intel-svm.c | 8 --------
>> include/linux/intel-iommu.h | 10 ++++++++--
>> 3 files changed, 21 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
>> index caa0b5c..99c643b 100644
>> --- a/drivers/iommu/intel-iommu.c
>> +++ b/drivers/iommu/intel-iommu.c
>> @@ -2460,6 +2460,18 @@ static struct dmar_domain
>> *dmar_insert_one_dev_info(struct intel_iommu *iommu,
>> dev->archdata.iommu = info;
>> spin_unlock_irqrestore(&device_domain_lock, flags);
>>
>> + if (dev && dev_is_pci(dev) && info->pasid_supported) {
>> + if (pasid_enabled(iommu)) {
>> + size_t size, count;
>> +
>> + size = sizeof(struct pasid_entry);
>> + count = min_t(int,
>> + pci_max_pasids(to_pci_dev(dev)),
>> + intel_pasid_max_id);
>> + ret = intel_pasid_alloc_table(dev, size, count);
> No check for the return value?

Nice catch. Will fix it in a v2.

>
>> + }
>> + }
>> +
>> if (dev && domain_context_mapping(domain, dev)) {
>> pr_err("Domain context map for %s failed\n", dev_name(dev));
>> dmar_remove_one_dev_info(domain, dev);
>> @@ -4826,6 +4838,7 @@ static void dmar_remove_one_dev_info(struct
>> dmar_domain *domain,
>> unsigned long flags;
>>
>> spin_lock_irqsave(&device_domain_lock, flags);
>> + intel_pasid_free_table(dev);
>> info = dev->archdata.iommu;
>> __dmar_remove_one_dev_info(info);
>> spin_unlock_irqrestore(&device_domain_lock, flags);
>> diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
>> index 24d0ea1..3abc94f 100644
>> --- a/drivers/iommu/intel-svm.c
>> +++ b/drivers/iommu/intel-svm.c
>> @@ -34,14 +34,6 @@
>>
>> static irqreturn_t prq_event_thread(int irq, void *d);
>>
>> -struct pasid_entry {
>> - u64 val;
>> -};
>> -
>> -struct pasid_state_entry {
>> - u64 val;
>> -};
>> -
>> int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
>> {
>> struct page *pages;
>> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
>> index bee7a3f..08e5811 100644
>> --- a/include/linux/intel-iommu.h
>> +++ b/include/linux/intel-iommu.h
>> @@ -382,8 +382,14 @@ enum {
>> #define VTD_FLAG_TRANS_PRE_ENABLED (1 << 0)
>> #define VTD_FLAG_IRQ_REMAP_PRE_ENABLED (1 << 1)
>>
>> -struct pasid_entry;
>> -struct pasid_state_entry;
>> +struct pasid_entry {
>> + u64 val;
>> +};
>> +
>> +struct pasid_state_entry {
>> + u64 val;
>> +};
>> +
>> struct page_req_dsc;
>>
>> struct dmar_domain {
> Overall, this patch looks good to me. But need to fix the comment above.
>
> Reviewed-by: Liu, Yi L <yi.l.liu@intel.com>
>
> Regards,
> Yi Liu

Sure.

Best regards,
Lu Baolu

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