On 2023/4/1 7:11, Jacob Pan wrote:
static void idxd_disable_system_pasid(struct idxd_device *idxd)
{
+ struct pci_dev *pdev = idxd->pdev;
+ struct device *dev = &pdev->dev;
+ struct iommu_domain *domain;
+ union gencfg_reg gencfg;
+
+ domain = iommu_get_domain_for_dev(dev);
+ if (!domain || domain->type == IOMMU_DOMAIN_BLOCKED)
+ return;
Out of curiosity, why do you need to check the domain type? And, in
which case could the domain for the device be changed to a blocking one?
Once a driver is bound to the device, the driver "owns" the DMA of the
device. No one else could change the domain except the driver itself.
+
+ iommu_detach_device_pasid(domain, dev, idxd->pasid);
+ iommu_free_global_pasid(idxd->pasid);
- iommu_sva_unbind_device(idxd->sva);
+ gencfg.bits = ioread32(idxd->reg_base + IDXD_GENCFG_OFFSET);
+ gencfg.user_int_en = 0;
+ iowrite32(gencfg.bits, idxd->reg_base + IDXD_GENCFG_OFFSET);
idxd->sva = NULL;
+ idxd->pasid = IOMMU_PASID_INVALID;
}
Best regards,
baolu
