Commit a0c47f23 authored by Vasant Hegde's avatar Vasant Hegde Committed by Joerg Roedel
Browse files

iommu/amd: Introduce iommu_dev_data.max_pasids 



This variable will track the number of PASIDs supported by the device.
If IOMMU or device doesn't support PASID then it will be zero.

This will be used while allocating GCR3 table to decide required number
of PASID table levels. Also in PASID bind path it will use this variable
to check whether device supports PASID or not.

Signed-off-by: default avatarVasant Hegde <vasant.hegde@amd.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240418103400.6229-7-vasant.hegde@amd.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 7c5b7176

drivers/iommu/amd/amd_iommu_types.h

+1 −0
Original line number Diff line number Diff line
@@ -813,6 +813,7 @@ struct iommu_dev_data { 
	struct device *dev;

	u16 devid;			  /* PCI Device ID */



	u32 max_pasids;			  /* Max supported PASIDs */

	u32 flags;			  /* Holds AMD_IOMMU_DEVICE_FLAG_<*> */

	int ats_qdep;

	u8 ats_enabled  :1;		  /* ATS state */

drivers/iommu/amd/iommu.c

+12 −0
Original line number Diff line number Diff line
@@ -2104,6 +2104,7 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev) 
{

	struct iommu_device *iommu_dev;

	struct amd_iommu *iommu;

	struct iommu_dev_data *dev_data;

	int ret;



	if (!check_device(dev))
@@ -2130,6 +2131,17 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev) 
		iommu_dev = &iommu->iommu;

	}



	/*

	 * If IOMMU and device supports PASID then it will contain max

	 * supported PASIDs, else it will be zero.

	 */

	dev_data = dev_iommu_priv_get(dev);

	if (amd_iommu_pasid_supported() && dev_is_pci(dev) &&

	    pdev_pasid_supported(dev_data)) {

		dev_data->max_pasids = min_t(u32, iommu->iommu.max_pasids,

					     pci_max_pasids(to_pci_dev(dev)));

	}



	iommu_completion_wait(iommu);



	return iommu_dev;