Re: [PATCH v2 2/4] iommu: Add new iommu op to get iommu hardware information

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On 2023/3/16 16:16, Tian, Kevin wrote:
+ *           allocated in the IOMMU driver and the caller should free it
+ *           after use. Return the data buffer if success, or ERR_PTR on
+ *           failure.
   * @domain_alloc: allocate iommu domain
   * @probe_device: Add device to iommu driver handling
   * @release_device: Remove device from iommu driver handling
@@ -246,11 +252,17 @@ struct iommu_iotlb_gather {
   * @remove_dev_pasid: Remove any translation configurations of a specific
   *                    pasid, so that any DMA transactions with this pasid
   *                    will be blocked by the hardware.
+ * @driver_type: One of enum iommu_hw_info_type. This is used in the
hw_info
+ *               reporting path. For the drivers that supports it, a unique
+ *               type should be defined. For the driver that does not support
+ *               it, this field is the IOMMU_HW_INFO_TYPE_DEFAULT that is 0.
+ *               Hence, such drivers do not need to care this field.
The meaning of "driver_type" is much broader than reporting hw_info.

let's be accurate to call it as "hw_info_type". and while we have two
separate fields for one feature where is the check enforced on whether
both are provided?

Is it simpler to return the type directly in @hw_info?

If I remember correctly, the vendor iommu type and hardware info are
reported to user space separately.

Best regards,
baolu



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