Commit 67f6f56b authored by Yi Liu's avatar Yi Liu Committed by Joerg Roedel
Browse files

iommu/vt-d: Add set_dev_pasid callback for nested domain 



Add intel_nested_set_dev_pasid() to set a nested type domain to a PASID
of a device.

Co-developed-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Signed-off-by: default avatarYi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20241107122234.7424-12-yi.l.liu@intel.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 9bc18d28

drivers/iommu/intel/iommu.c

+0 −6
Original line number Diff line number Diff line
@@ -1812,12 +1812,6 @@ static int domain_setup_first_level(struct intel_iommu *iommu, 
					  (pgd_t *)pgd, flags, old);

}



static bool dev_is_real_dma_subdevice(struct device *dev)

{

	return dev && dev_is_pci(dev) &&

	       pci_real_dma_dev(to_pci_dev(dev)) != to_pci_dev(dev);

}



static int dmar_domain_attach_device(struct dmar_domain *domain,

				     struct device *dev)

{

drivers/iommu/intel/iommu.h

+7 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/bitfield.h>

#include <linux/xarray.h>

#include <linux/perf_event.h>

#include <linux/pci.h>



#include <asm/cacheflush.h>

#include <asm/iommu.h>
@@ -832,6 +833,12 @@ iommu_domain_did(struct iommu_domain *domain, struct intel_iommu *iommu) 
	return domain_id_iommu(to_dmar_domain(domain), iommu);

}



static inline bool dev_is_real_dma_subdevice(struct device *dev)

{

	return dev && dev_is_pci(dev) &&

	       pci_real_dma_dev(to_pci_dev(dev)) != to_pci_dev(dev);

}



/*

 * 0: readable

 * 1: writable

drivers/iommu/intel/nested.c

+50 −0
Original line number Diff line number Diff line
@@ -130,8 +130,58 @@ static int intel_nested_cache_invalidate_user(struct iommu_domain *domain, 
	return ret;

}



static int domain_setup_nested(struct intel_iommu *iommu,

			       struct dmar_domain *domain,

			       struct device *dev, ioasid_t pasid,

			       struct iommu_domain *old)

{

	if (!old)

		return intel_pasid_setup_nested(iommu, dev, pasid, domain);

	return intel_pasid_replace_nested(iommu, dev, pasid,

					  iommu_domain_did(old, iommu),

					  domain);

}



static int intel_nested_set_dev_pasid(struct iommu_domain *domain,

				      struct device *dev, ioasid_t pasid,

				      struct iommu_domain *old)

{

	struct device_domain_info *info = dev_iommu_priv_get(dev);

	struct dmar_domain *dmar_domain = to_dmar_domain(domain);

	struct intel_iommu *iommu = info->iommu;

	struct dev_pasid_info *dev_pasid;

	int ret;



	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))

		return -EOPNOTSUPP;



	if (context_copied(iommu, info->bus, info->devfn))

		return -EBUSY;



	ret = paging_domain_compatible(&dmar_domain->s2_domain->domain, dev);

	if (ret)

		return ret;



	dev_pasid = domain_add_dev_pasid(domain, dev, pasid);

	if (IS_ERR(dev_pasid))

		return PTR_ERR(dev_pasid);



	ret = domain_setup_nested(iommu, dmar_domain, dev, pasid, old);

	if (ret)

		goto out_remove_dev_pasid;



	domain_remove_dev_pasid(old, dev, pasid);



	return 0;



out_remove_dev_pasid:

	domain_remove_dev_pasid(domain, dev, pasid);

	return ret;

}



static const struct iommu_domain_ops intel_nested_domain_ops = {

	.attach_dev		= intel_nested_attach_dev,

	.set_dev_pasid		= intel_nested_set_dev_pasid,

	.free			= intel_nested_domain_free,

	.cache_invalidate_user	= intel_nested_cache_invalidate_user,

};