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@@ -0,0 +1,337 @@
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+/*
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+ * IOMMU API for s390 PCI devices
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+ *
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+ * Copyright IBM Corp. 2015
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+ * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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+ */
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+
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+#include <linux/pci.h>
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+#include <linux/iommu.h>
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+#include <linux/iommu-helper.h>
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+#include <linux/pci.h>
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+#include <linux/sizes.h>
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+#include <asm/pci_dma.h>
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+
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+/*
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+ * Physically contiguous memory regions can be mapped with 4 KiB alignment,
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+ * we allow all page sizes that are an order of 4KiB (no special large page
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+ * support so far).
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+ */
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+#define S390_IOMMU_PGSIZES (~0xFFFUL)
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+
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+struct s390_domain {
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+ struct iommu_domain domain;
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+ struct list_head devices;
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+ unsigned long *dma_table;
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+ spinlock_t dma_table_lock;
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+ spinlock_t list_lock;
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+};
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+
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+struct s390_domain_device {
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+ struct list_head list;
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+ struct zpci_dev *zdev;
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+};
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+
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+static struct s390_domain *to_s390_domain(struct iommu_domain *dom)
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+{
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+ return container_of(dom, struct s390_domain, domain);
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+}
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+
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+static bool s390_iommu_capable(enum iommu_cap cap)
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+{
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+ switch (cap) {
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+ case IOMMU_CAP_CACHE_COHERENCY:
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+ return true;
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+ case IOMMU_CAP_INTR_REMAP:
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+ return true;
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+ default:
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+ return false;
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+ }
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+}
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+
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+struct iommu_domain *s390_domain_alloc(unsigned domain_type)
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+{
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+ struct s390_domain *s390_domain;
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+
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+ if (domain_type != IOMMU_DOMAIN_UNMANAGED)
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+ return NULL;
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+
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+ s390_domain = kzalloc(sizeof(*s390_domain), GFP_KERNEL);
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+ if (!s390_domain)
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+ return NULL;
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+
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+ s390_domain->dma_table = dma_alloc_cpu_table();
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+ if (!s390_domain->dma_table) {
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+ kfree(s390_domain);
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+ return NULL;
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+ }
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+
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+ spin_lock_init(&s390_domain->dma_table_lock);
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+ spin_lock_init(&s390_domain->list_lock);
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+ INIT_LIST_HEAD(&s390_domain->devices);
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+
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+ return &s390_domain->domain;
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+}
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+
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+void s390_domain_free(struct iommu_domain *domain)
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+{
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+ struct s390_domain *s390_domain = to_s390_domain(domain);
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+
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+ dma_cleanup_tables(s390_domain->dma_table);
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+ kfree(s390_domain);
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+}
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+
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+static int s390_iommu_attach_device(struct iommu_domain *domain,
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+ struct device *dev)
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+{
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+ struct s390_domain *s390_domain = to_s390_domain(domain);
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+ struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
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+ struct s390_domain_device *domain_device;
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+ unsigned long flags;
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+ int rc;
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+
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+ if (!zdev)
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+ return -ENODEV;
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+
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+ domain_device = kzalloc(sizeof(*domain_device), GFP_KERNEL);
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+ if (!domain_device)
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+ return -ENOMEM;
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+
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+ if (zdev->dma_table)
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+ zpci_dma_exit_device(zdev);
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+
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+ zdev->dma_table = s390_domain->dma_table;
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+ rc = zpci_register_ioat(zdev, 0, zdev->start_dma + PAGE_OFFSET,
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+ zdev->start_dma + zdev->iommu_size - 1,
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+ (u64) zdev->dma_table);
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+ if (rc)
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+ goto out_restore;
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+
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+ spin_lock_irqsave(&s390_domain->list_lock, flags);
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+ /* First device defines the DMA range limits */
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+ if (list_empty(&s390_domain->devices)) {
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+ domain->geometry.aperture_start = zdev->start_dma;
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+ domain->geometry.aperture_end = zdev->end_dma;
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+ domain->geometry.force_aperture = true;
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+ /* Allow only devices with identical DMA range limits */
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+ } else if (domain->geometry.aperture_start != zdev->start_dma ||
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+ domain->geometry.aperture_end != zdev->end_dma) {
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+ rc = -EINVAL;
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+ spin_unlock_irqrestore(&s390_domain->list_lock, flags);
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+ goto out_restore;
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+ }
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+ domain_device->zdev = zdev;
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+ zdev->s390_domain = s390_domain;
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+ list_add(&domain_device->list, &s390_domain->devices);
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+ spin_unlock_irqrestore(&s390_domain->list_lock, flags);
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+
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+ return 0;
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+
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+out_restore:
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+ zpci_dma_init_device(zdev);
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+ kfree(domain_device);
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+
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+ return rc;
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+}
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+
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+static void s390_iommu_detach_device(struct iommu_domain *domain,
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+ struct device *dev)
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+{
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+ struct s390_domain *s390_domain = to_s390_domain(domain);
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+ struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
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+ struct s390_domain_device *domain_device, *tmp;
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+ unsigned long flags;
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+ int found = 0;
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+
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+ if (!zdev)
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+ return;
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+
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+ spin_lock_irqsave(&s390_domain->list_lock, flags);
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+ list_for_each_entry_safe(domain_device, tmp, &s390_domain->devices,
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+ list) {
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+ if (domain_device->zdev == zdev) {
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+ list_del(&domain_device->list);
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+ kfree(domain_device);
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+ found = 1;
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+ break;
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+ }
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+ }
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+ spin_unlock_irqrestore(&s390_domain->list_lock, flags);
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+
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+ if (found) {
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+ zdev->s390_domain = NULL;
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+ zpci_unregister_ioat(zdev, 0);
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+ zpci_dma_init_device(zdev);
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+ }
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+}
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+
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+static int s390_iommu_add_device(struct device *dev)
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+{
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+ struct iommu_group *group;
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+ int rc;
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+
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+ group = iommu_group_get(dev);
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+ if (!group) {
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+ group = iommu_group_alloc();
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+ if (IS_ERR(group))
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+ return PTR_ERR(group);
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+ }
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+
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+ rc = iommu_group_add_device(group, dev);
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+ iommu_group_put(group);
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+
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+ return rc;
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+}
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+
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+static void s390_iommu_remove_device(struct device *dev)
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+{
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+ struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
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+ struct iommu_domain *domain;
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+
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+ /*
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+ * This is a workaround for a scenario where the IOMMU API common code
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+ * "forgets" to call the detach_dev callback: After binding a device
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+ * to vfio-pci and completing the VFIO_SET_IOMMU ioctl (which triggers
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+ * the attach_dev), removing the device via
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+ * "echo 1 > /sys/bus/pci/devices/.../remove" won't trigger detach_dev,
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+ * only remove_device will be called via the BUS_NOTIFY_REMOVED_DEVICE
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+ * notifier.
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+ *
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+ * So let's call detach_dev from here if it hasn't been called before.
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+ */
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+ if (zdev && zdev->s390_domain) {
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+ domain = iommu_get_domain_for_dev(dev);
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+ if (domain)
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+ s390_iommu_detach_device(domain, dev);
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+ }
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+
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+ iommu_group_remove_device(dev);
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+}
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+
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+static int s390_iommu_update_trans(struct s390_domain *s390_domain,
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+ unsigned long pa, dma_addr_t dma_addr,
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+ size_t size, int flags)
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+{
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+ struct s390_domain_device *domain_device;
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+ u8 *page_addr = (u8 *) (pa & PAGE_MASK);
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+ dma_addr_t start_dma_addr = dma_addr;
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+ unsigned long irq_flags, nr_pages, i;
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+ int rc = 0;
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+
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+ if (dma_addr < s390_domain->domain.geometry.aperture_start ||
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+ dma_addr + size > s390_domain->domain.geometry.aperture_end)
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+ return -EINVAL;
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+
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+ nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
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+ if (!nr_pages)
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+ return 0;
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+
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+ spin_lock_irqsave(&s390_domain->dma_table_lock, irq_flags);
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+ for (i = 0; i < nr_pages; i++) {
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+ dma_update_cpu_trans(s390_domain->dma_table, page_addr,
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+ dma_addr, flags);
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+ page_addr += PAGE_SIZE;
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+ dma_addr += PAGE_SIZE;
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+ }
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+
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+ spin_lock(&s390_domain->list_lock);
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+ list_for_each_entry(domain_device, &s390_domain->devices, list) {
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+ rc = zpci_refresh_trans((u64) domain_device->zdev->fh << 32,
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+ start_dma_addr, nr_pages * PAGE_SIZE);
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+ if (rc)
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+ break;
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+ }
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+ spin_unlock(&s390_domain->list_lock);
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+ spin_unlock_irqrestore(&s390_domain->dma_table_lock, irq_flags);
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+
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+ return rc;
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+}
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+
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+static int s390_iommu_map(struct iommu_domain *domain, unsigned long iova,
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+ phys_addr_t paddr, size_t size, int prot)
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+{
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+ struct s390_domain *s390_domain = to_s390_domain(domain);
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+ int flags = ZPCI_PTE_VALID, rc = 0;
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+
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+ if (!(prot & IOMMU_READ))
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+ return -EINVAL;
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+
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+ if (!(prot & IOMMU_WRITE))
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+ flags |= ZPCI_TABLE_PROTECTED;
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+
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+ rc = s390_iommu_update_trans(s390_domain, (unsigned long) paddr, iova,
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+ size, flags);
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+
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+ return rc;
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+}
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+
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+static phys_addr_t s390_iommu_iova_to_phys(struct iommu_domain *domain,
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+ dma_addr_t iova)
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+{
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+ struct s390_domain *s390_domain = to_s390_domain(domain);
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+ unsigned long *sto, *pto, *rto, flags;
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+ unsigned int rtx, sx, px;
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+ phys_addr_t phys = 0;
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+
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+ if (iova < domain->geometry.aperture_start ||
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+ iova > domain->geometry.aperture_end)
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+ return 0;
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+
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+ rtx = calc_rtx(iova);
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+ sx = calc_sx(iova);
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+ px = calc_px(iova);
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+ rto = s390_domain->dma_table;
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+
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+ spin_lock_irqsave(&s390_domain->dma_table_lock, flags);
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+ if (rto && reg_entry_isvalid(rto[rtx])) {
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+ sto = get_rt_sto(rto[rtx]);
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+ if (sto && reg_entry_isvalid(sto[sx])) {
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+ pto = get_st_pto(sto[sx]);
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+ if (pto && pt_entry_isvalid(pto[px]))
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+ phys = pto[px] & ZPCI_PTE_ADDR_MASK;
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+ }
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+ }
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+ spin_unlock_irqrestore(&s390_domain->dma_table_lock, flags);
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+
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+ return phys;
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+}
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+
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+static size_t s390_iommu_unmap(struct iommu_domain *domain,
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+ unsigned long iova, size_t size)
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+{
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+ struct s390_domain *s390_domain = to_s390_domain(domain);
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+ int flags = ZPCI_PTE_INVALID;
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+ phys_addr_t paddr;
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+ int rc;
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+
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+ paddr = s390_iommu_iova_to_phys(domain, iova);
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+ if (!paddr)
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+ return 0;
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+
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+ rc = s390_iommu_update_trans(s390_domain, (unsigned long) paddr, iova,
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+ size, flags);
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+ if (rc)
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+ return 0;
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+
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+ return size;
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+}
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+
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+static struct iommu_ops s390_iommu_ops = {
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+ .capable = s390_iommu_capable,
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+ .domain_alloc = s390_domain_alloc,
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+ .domain_free = s390_domain_free,
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+ .attach_dev = s390_iommu_attach_device,
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+ .detach_dev = s390_iommu_detach_device,
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+ .map = s390_iommu_map,
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+ .unmap = s390_iommu_unmap,
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+ .iova_to_phys = s390_iommu_iova_to_phys,
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+ .add_device = s390_iommu_add_device,
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+ .remove_device = s390_iommu_remove_device,
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+ .pgsize_bitmap = S390_IOMMU_PGSIZES,
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+};
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+
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+static int __init s390_iommu_init(void)
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+{
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+ return bus_set_iommu(&pci_bus_type, &s390_iommu_ops);
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+}
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+subsys_initcall(s390_iommu_init);
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Gerald Schaefer