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![Joerg Roedel](/assets/img/avatar_default.png)
The iommu_group_get_for_dev() function also attaches the device to its group, so this code doesn't need to be in the iommu driver. Further by using this function the driver can make use of default domains in the future. Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
349 lines
8.7 KiB
C
349 lines
8.7 KiB
C
/*
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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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#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/sizes.h>
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#include <asm/pci_dma.h>
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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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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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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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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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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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static 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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if (domain_type != IOMMU_DOMAIN_UNMANAGED)
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return NULL;
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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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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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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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return &s390_domain->domain;
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}
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static 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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dma_cleanup_tables(s390_domain->dma_table);
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kfree(s390_domain);
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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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if (!zdev)
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return -ENODEV;
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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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if (zdev->dma_table)
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zpci_dma_exit_device(zdev);
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zdev->dma_table = s390_domain->dma_table;
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rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
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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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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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return 0;
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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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return rc;
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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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if (!zdev)
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return;
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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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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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static int s390_iommu_add_device(struct device *dev)
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{
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struct iommu_group *group = iommu_group_get_for_dev(dev);
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if (IS_ERR(group))
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return PTR_ERR(group);
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iommu_group_put(group);
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return 0;
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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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* 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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iommu_group_remove_device(dev);
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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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unsigned long *entry;
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int rc = 0;
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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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nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
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if (!nr_pages)
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return 0;
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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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entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr);
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if (!entry) {
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rc = -ENOMEM;
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goto undo_cpu_trans;
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}
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dma_update_cpu_trans(entry, page_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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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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undo_cpu_trans:
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if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID)) {
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flags = ZPCI_PTE_INVALID;
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while (i-- > 0) {
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page_addr -= PAGE_SIZE;
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dma_addr -= PAGE_SIZE;
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entry = dma_walk_cpu_trans(s390_domain->dma_table,
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dma_addr);
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if (!entry)
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break;
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dma_update_cpu_trans(entry, page_addr, flags);
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}
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}
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spin_unlock_irqrestore(&s390_domain->dma_table_lock, irq_flags);
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return rc;
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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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if (!(prot & IOMMU_READ))
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return -EINVAL;
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if (!(prot & IOMMU_WRITE))
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flags |= ZPCI_TABLE_PROTECTED;
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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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return rc;
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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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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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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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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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return phys;
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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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paddr = s390_iommu_iova_to_phys(domain, iova);
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if (!paddr)
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return 0;
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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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return size;
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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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.device_group = generic_device_group,
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.pgsize_bitmap = S390_IOMMU_PGSIZES,
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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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