377 lines
9.1 KiB
C
377 lines
9.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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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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#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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static const struct iommu_ops s390_iommu_ops;
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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(struct device *dev, 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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WARN_ON(!list_empty(&s390_domain->devices));
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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 void __s390_iommu_detach_device(struct zpci_dev *zdev)
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{
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struct s390_domain *s390_domain = zdev->s390_domain;
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struct s390_domain_device *domain_device, *tmp;
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unsigned long flags;
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if (!s390_domain)
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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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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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zpci_unregister_ioat(zdev, 0);
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zdev->s390_domain = NULL;
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zdev->dma_table = NULL;
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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_zpci_dev(dev);
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struct s390_domain_device *domain_device;
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unsigned long flags;
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int cc, rc = 0;
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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->s390_domain)
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__s390_iommu_detach_device(zdev);
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else if (zdev->dma_table)
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zpci_dma_exit_device(zdev);
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cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
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virt_to_phys(s390_domain->dma_table));
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if (cc) {
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rc = -EIO;
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goto out_free;
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}
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zdev->dma_table = s390_domain->dma_table;
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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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spin_unlock_irqrestore(&s390_domain->list_lock, flags);
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rc = -EINVAL;
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goto out_unregister;
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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_unregister:
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zpci_unregister_ioat(zdev, 0);
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zdev->dma_table = NULL;
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out_free:
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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 zpci_dev *zdev = to_zpci_dev(dev);
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WARN_ON(zdev->s390_domain != to_s390_domain(domain));
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__s390_iommu_detach_device(zdev);
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zpci_dma_init_device(zdev);
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}
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static struct iommu_device *s390_iommu_probe_device(struct device *dev)
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{
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struct zpci_dev *zdev;
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if (!dev_is_pci(dev))
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return ERR_PTR(-ENODEV);
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zdev = to_zpci_dev(dev);
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return &zdev->iommu_dev;
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}
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static void s390_iommu_release_device(struct device *dev)
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{
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struct zpci_dev *zdev = to_zpci_dev(dev);
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/*
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* release_device is expected to detach any domain currently attached
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* to the device, but keep it attached to other devices in the group.
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*/
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if (zdev)
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__s390_iommu_detach_device(zdev);
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}
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static int s390_iommu_update_trans(struct s390_domain *s390_domain,
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phys_addr_t 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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phys_addr_t page_addr = 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, gfp_t gfp)
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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, 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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struct iommu_iotlb_gather *gather)
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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, 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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int zpci_init_iommu(struct zpci_dev *zdev)
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{
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int rc = 0;
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rc = iommu_device_sysfs_add(&zdev->iommu_dev, NULL, NULL,
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"s390-iommu.%08x", zdev->fid);
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if (rc)
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goto out_err;
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rc = iommu_device_register(&zdev->iommu_dev, &s390_iommu_ops, NULL);
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if (rc)
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goto out_sysfs;
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return 0;
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out_sysfs:
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iommu_device_sysfs_remove(&zdev->iommu_dev);
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out_err:
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return rc;
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}
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void zpci_destroy_iommu(struct zpci_dev *zdev)
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{
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iommu_device_unregister(&zdev->iommu_dev);
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iommu_device_sysfs_remove(&zdev->iommu_dev);
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}
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static const 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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.probe_device = s390_iommu_probe_device,
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.release_device = s390_iommu_release_device,
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.device_group = generic_device_group,
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.pgsize_bitmap = S390_IOMMU_PGSIZES,
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.default_domain_ops = &(const struct iommu_domain_ops) {
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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,
|
||
|
|
.unmap = s390_iommu_unmap,
|
||
|
|
.iova_to_phys = s390_iommu_iova_to_phys,
|
||
|
|
.free = s390_domain_free,
|
||
|
|
}
|
||
|
|
};
|