Re: [PATCH 1/6] iommu: Add new iommu op to get iommu hardware information

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On 2023/2/10 15:28, Tian, Kevin wrote:
From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
Sent: Thursday, February 9, 2023 12:17 PM
@@ -223,6 +224,11 @@ struct iommu_iotlb_gather {
  /**
   * struct iommu_ops - iommu ops and capabilities
   * @capable: check capability
+ * @hw_info: IOMMU hardware capabilities. The type of the returned data
is

is it 'info' or 'capability'?

+ *           defined in include/uapi/linux/iommufd.h. The data buffer is
+ *           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
@@ -252,6 +258,7 @@ struct iommu_iotlb_gather {
   */
  struct iommu_ops {
  	bool (*capable)(struct device *dev, enum iommu_cap);
+	void *(*hw_info)(struct device *dev, u32 *length);

  	/* Domain allocation and freeing by the iommu driver */
  	struct iommu_domain *(*domain_alloc)(unsigned
iommu_domain_type);
@@ -280,6 +287,7 @@ struct iommu_ops {
  	void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);

  	const struct iommu_domain_ops *default_domain_ops;
+	enum iommu_device_data_type driver_type;

the enum is called 'device_data_type' while the field is called 'driver_type'.

The enum is named from uAPI's p-o-v and driver_type is from IOMMU's.

btw this new field is not documented above.

Yes. Will do that.

Best regards,
baolu



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