From e04c7487a6655722172e93e8f36e51d6ab279f86 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Wed, 13 Sep 2023 10:43:37 -0300 Subject: [PATCH] iommu: Add IOMMU_DOMAIN_PLATFORM for S390 The PLATFORM domain will be set as the default domain and attached as normal during probe. The driver will ignore the initial attach from a NULL domain to the PLATFORM domain. After this, the PLATFORM domain's attach_dev will be called whenever we detach from an UNMANAGED domain (eg for VFIO). This is the same time the original design would have called op->detach_dev(). This is temporary until the S390 dma-iommu.c conversion is merged. Tested-by: Heiko Stuebner Tested-by: Niklas Schnelle Reviewed-by: Lu Baolu Reviewed-by: Jerry Snitselaar Signed-off-by: Jason Gunthorpe Link: https://lore.kernel.org/r/4-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com Signed-off-by: Joerg Roedel --- drivers/iommu/s390-iommu.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index fbf59a8db29b..f0c867c57a5b 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -142,14 +142,31 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, return 0; } -static void s390_iommu_set_platform_dma(struct device *dev) +/* + * Switch control over the IOMMU to S390's internal dma_api ops + */ +static int s390_iommu_platform_attach(struct iommu_domain *platform_domain, + struct device *dev) { struct zpci_dev *zdev = to_zpci_dev(dev); + if (!zdev->s390_domain) + return 0; + __s390_iommu_detach_device(zdev); zpci_dma_init_device(zdev); + return 0; } +static struct iommu_domain_ops s390_iommu_platform_ops = { + .attach_dev = s390_iommu_platform_attach, +}; + +static struct iommu_domain s390_iommu_platform_domain = { + .type = IOMMU_DOMAIN_PLATFORM, + .ops = &s390_iommu_platform_ops, +}; + static void s390_iommu_get_resv_regions(struct device *dev, struct list_head *list) { @@ -428,12 +445,12 @@ void zpci_destroy_iommu(struct zpci_dev *zdev) } static const struct iommu_ops s390_iommu_ops = { + .default_domain = &s390_iommu_platform_domain, .capable = s390_iommu_capable, .domain_alloc = s390_domain_alloc, .probe_device = s390_iommu_probe_device, .release_device = s390_iommu_release_device, .device_group = generic_device_group, - .set_platform_dma_ops = s390_iommu_set_platform_dma, .pgsize_bitmap = SZ_4K, .get_resv_regions = s390_iommu_get_resv_regions, .default_domain_ops = &(const struct iommu_domain_ops) { -- 2.25.1