| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Joerg Roedel | 13557 | 71.66% | 259 | 66.41% |
| Suravee Suthikulpanit | 2208 | 11.67% | 14 | 3.59% |
| Jiang Liu | 1012 | 5.35% | 3 | 0.77% |
| Zongshun (Vincent) Wan | 498 | 2.63% | 6 | 1.54% |
| Sebastian Andrzej Siewior | 290 | 1.53% | 10 | 2.56% |
| Thomas Gleixner | 175 | 0.93% | 7 | 1.79% |
| Gary R Hook | 171 | 0.90% | 6 | 1.54% |
| Linus Torvalds | 140 | 0.74% | 2 | 0.51% |
| Baoquan He | 131 | 0.69% | 9 | 2.31% |
| Alex Williamson | 114 | 0.60% | 10 | 2.56% |
| Eric Auger | 112 | 0.59% | 2 | 0.51% |
| Tom Lendacky | 94 | 0.50% | 4 | 1.03% |
| Scott Wood | 51 | 0.27% | 2 | 0.51% |
| FUJITA Tomonori | 50 | 0.26% | 2 | 0.51% |
| Christoph Hellwig | 42 | 0.22% | 6 | 1.54% |
| Björn Helgaas | 30 | 0.16% | 1 | 0.26% |
| Anna-Maria Gleixner | 22 | 0.12% | 2 | 0.51% |
| Aaron Ma | 21 | 0.11% | 1 | 0.26% |
| Julia Lawall | 17 | 0.09% | 1 | 0.26% |
| Gil Kupfer | 16 | 0.08% | 1 | 0.26% |
| Arindam Nath | 12 | 0.06% | 1 | 0.26% |
| Krzysztof Kozlowski | 12 | 0.06% | 1 | 0.26% |
| Sheng Yang | 10 | 0.05% | 1 | 0.26% |
| Zhen Lei | 9 | 0.05% | 1 | 0.26% |
| Robin Murphy | 9 | 0.05% | 2 | 0.51% |
| Maurizio Lombardi | 9 | 0.05% | 1 | 0.26% |
| Yu Zhao | 8 | 0.04% | 1 | 0.26% |
| Shuah Khan | 6 | 0.03% | 1 | 0.26% |
| Will Deacon | 6 | 0.03% | 1 | 0.26% |
| Stanislaw Gruszka | 6 | 0.03% | 1 | 0.26% |
| Andrzej Pietrasiewicz | 6 | 0.03% | 1 | 0.26% |
| Chris Wright | 6 | 0.03% | 2 | 0.51% |
| Arnd Bergmann | 6 | 0.03% | 1 | 0.26% |
| Quentin Lambert | 6 | 0.03% | 1 | 0.26% |
| Gerard Snitselaar | 6 | 0.03% | 3 | 0.77% |
| Jay Cornwall | 5 | 0.03% | 1 | 0.26% |
| yzhai003 at ucr.edu | 5 | 0.03% | 1 | 0.26% |
| Tomasz Nowicki | 4 | 0.02% | 1 | 0.26% |
| Wei Yongjun | 4 | 0.02% | 1 | 0.26% |
| Sinan Kaya | 3 | 0.02% | 1 | 0.26% |
| Ohad Ben-Cohen | 3 | 0.02% | 1 | 0.26% |
| Brijesh Singh | 3 | 0.02% | 1 | 0.26% |
| Bart Van Assche | 2 | 0.01% | 1 | 0.26% |
| Lu Baolu | 2 | 0.01% | 1 | 0.26% |
| Tejun Heo | 2 | 0.01% | 1 | 0.26% |
| Dan Carpenter | 2 | 0.01% | 2 | 0.51% |
| Radmila Kompová | 2 | 0.01% | 1 | 0.26% |
| Marek Szyprowski | 2 | 0.01% | 1 | 0.26% |
| Thierry Reding | 2 | 0.01% | 1 | 0.26% |
| Lucas Stach | 2 | 0.01% | 1 | 0.26% |
| Tobias Klauser | 1 | 0.01% | 1 | 0.26% |
| Jean-Philippe Brucker | 1 | 0.01% | 1 | 0.26% |
| Varun Sethi | 1 | 0.01% | 1 | 0.26% |
| Uwe Kleine-König | 1 | 0.01% | 1 | 0.26% |
| Frank Arnold | 1 | 0.01% | 1 | 0.26% |
| Heiner Kallweit | 1 | 0.01% | 1 | 0.26% |
| Huang Rui | 1 | 0.01% | 1 | 0.26% |
| Total | 18918 | 390 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. * Author: Joerg Roedel <jroedel@suse.de> * Leo Duran <leo.duran@amd.com> */ #define pr_fmt(fmt) "AMD-Vi: " fmt #define dev_fmt(fmt) pr_fmt(fmt) #include <linux/ratelimit.h> #include <linux/pci.h> #include <linux/acpi.h> #include <linux/amba/bus.h> #include <linux/platform_device.h> #include <linux/pci-ats.h> #include <linux/bitmap.h> #include <linux/slab.h> #include <linux/debugfs.h> #include <linux/scatterlist.h> #include <linux/dma-mapping.h> #include <linux/dma-direct.h> #include <linux/iommu-helper.h> #include <linux/iommu.h> #include <linux/delay.h> #include <linux/amd-iommu.h> #include <linux/notifier.h> #include <linux/export.h> #include <linux/irq.h> #include <linux/msi.h> #include <linux/dma-contiguous.h> #include <linux/irqdomain.h> #include <linux/percpu.h> #include <linux/iova.h> #include <asm/irq_remapping.h> #include <asm/io_apic.h> #include <asm/apic.h> #include <asm/hw_irq.h> #include <asm/msidef.h> #include <asm/proto.h> #include <asm/iommu.h> #include <asm/gart.h> #include <asm/dma.h> #include "amd_iommu_proto.h" #include "amd_iommu_types.h" #include "irq_remapping.h" #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) #define LOOP_TIMEOUT 100000 /* IO virtual address start page frame number */ #define IOVA_START_PFN (1) #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT) /* Reserved IOVA ranges */ #define MSI_RANGE_START (0xfee00000) #define MSI_RANGE_END (0xfeefffff) #define HT_RANGE_START (0xfd00000000ULL) #define HT_RANGE_END (0xffffffffffULL) /* * This bitmap is used to advertise the page sizes our hardware support * to the IOMMU core, which will then use this information to split * physically contiguous memory regions it is mapping into page sizes * that we support. * * 512GB Pages are not supported due to a hardware bug */ #define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38)) static DEFINE_SPINLOCK(amd_iommu_devtable_lock); static DEFINE_SPINLOCK(pd_bitmap_lock); /* List of all available dev_data structures */ static LLIST_HEAD(dev_data_list); LIST_HEAD(ioapic_map); LIST_HEAD(hpet_map); LIST_HEAD(acpihid_map); /* * Domain for untranslated devices - only allocated * if iommu=pt passed on kernel cmd line. */ const struct iommu_ops amd_iommu_ops; static ATOMIC_NOTIFIER_HEAD(ppr_notifier); int amd_iommu_max_glx_val = -1; static const struct dma_map_ops amd_iommu_dma_ops; /* * general struct to manage commands send to an IOMMU */ struct iommu_cmd { u32 data[4]; }; struct kmem_cache *amd_iommu_irq_cache; static void update_domain(struct protection_domain *domain); static int protection_domain_init(struct protection_domain *domain); static void detach_device(struct device *dev); static void iova_domain_flush_tlb(struct iova_domain *iovad); /* * Data container for a dma_ops specific protection domain */ struct dma_ops_domain { /* generic protection domain information */ struct protection_domain domain; /* IOVA RB-Tree */ struct iova_domain iovad; }; static struct iova_domain reserved_iova_ranges; static struct lock_class_key reserved_rbtree_key; /**************************************************************************** * * Helper functions * ****************************************************************************/ static inline int match_hid_uid(struct device *dev, struct acpihid_map_entry *entry) { struct acpi_device *adev = ACPI_COMPANION(dev); const char *hid, *uid; if (!adev) return -ENODEV; hid = acpi_device_hid(adev); uid = acpi_device_uid(adev); if (!hid || !(*hid)) return -ENODEV; if (!uid || !(*uid)) return strcmp(hid, entry->hid); if (!(*entry->uid)) return strcmp(hid, entry->hid); return (strcmp(hid, entry->hid) || strcmp(uid, entry->uid)); } static inline u16 get_pci_device_id(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); return pci_dev_id(pdev); } static inline int get_acpihid_device_id(struct device *dev, struct acpihid_map_entry **entry) { struct acpihid_map_entry *p; list_for_each_entry(p, &acpihid_map, list) { if (!match_hid_uid(dev, p)) { if (entry) *entry = p; return p->devid; } } return -EINVAL; } static inline int get_device_id(struct device *dev) { int devid; if (dev_is_pci(dev)) devid = get_pci_device_id(dev); else devid = get_acpihid_device_id(dev, NULL); return devid; } static struct protection_domain *to_pdomain(struct iommu_domain *dom) { return container_of(dom, struct protection_domain, domain); } static struct dma_ops_domain* to_dma_ops_domain(struct protection_domain *domain) { BUG_ON(domain->flags != PD_DMA_OPS_MASK); return container_of(domain, struct dma_ops_domain, domain); } static struct iommu_dev_data *alloc_dev_data(u16 devid) { struct iommu_dev_data *dev_data; dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); if (!dev_data) return NULL; dev_data->devid = devid; ratelimit_default_init(&dev_data->rs); llist_add(&dev_data->dev_data_list, &dev_data_list); return dev_data; } static struct iommu_dev_data *search_dev_data(u16 devid) { struct iommu_dev_data *dev_data; struct llist_node *node; if (llist_empty(&dev_data_list)) return NULL; node = dev_data_list.first; llist_for_each_entry(dev_data, node, dev_data_list) { if (dev_data->devid == devid) return dev_data; } return NULL; } static int __last_alias(struct pci_dev *pdev, u16 alias, void *data) { *(u16 *)data = alias; return 0; } static u16 get_alias(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); u16 devid, ivrs_alias, pci_alias; /* The callers make sure that get_device_id() does not fail here */ devid = get_device_id(dev); /* For ACPI HID devices, we simply return the devid as such */ if (!dev_is_pci(dev)) return devid; ivrs_alias = amd_iommu_alias_table[devid]; pci_for_each_dma_alias(pdev, __last_alias, &pci_alias); if (ivrs_alias == pci_alias) return ivrs_alias; /* * DMA alias showdown * * The IVRS is fairly reliable in telling us about aliases, but it * can't know about every screwy device. If we don't have an IVRS * reported alias, use the PCI reported alias. In that case we may * still need to initialize the rlookup and dev_table entries if the * alias is to a non-existent device. */ if (ivrs_alias == devid) { if (!amd_iommu_rlookup_table[pci_alias]) { amd_iommu_rlookup_table[pci_alias] = amd_iommu_rlookup_table[devid]; memcpy(amd_iommu_dev_table[pci_alias].data, amd_iommu_dev_table[devid].data, sizeof(amd_iommu_dev_table[pci_alias].data)); } return pci_alias; } pci_info(pdev, "Using IVRS reported alias %02x:%02x.%d " "for device [%04x:%04x], kernel reported alias " "%02x:%02x.%d\n", PCI_BUS_NUM(ivrs_alias), PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias), pdev->vendor, pdev->device, PCI_BUS_NUM(pci_alias), PCI_SLOT(pci_alias), PCI_FUNC(pci_alias)); /* * If we don't have a PCI DMA alias and the IVRS alias is on the same * bus, then the IVRS table may know about a quirk that we don't. */ if (pci_alias == devid && PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) { pci_add_dma_alias(pdev, ivrs_alias & 0xff); pci_info(pdev, "Added PCI DMA alias %02x.%d\n", PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias)); } return ivrs_alias; } static struct iommu_dev_data *find_dev_data(u16 devid) { struct iommu_dev_data *dev_data; struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; dev_data = search_dev_data(devid); if (dev_data == NULL) { dev_data = alloc_dev_data(devid); if (!dev_data) return NULL; if (translation_pre_enabled(iommu)) dev_data->defer_attach = true; } return dev_data; } struct iommu_dev_data *get_dev_data(struct device *dev) { return dev->archdata.iommu; } EXPORT_SYMBOL(get_dev_data); /* * Find or create an IOMMU group for a acpihid device. */ static struct iommu_group *acpihid_device_group(struct device *dev) { struct acpihid_map_entry *p, *entry = NULL; int devid; devid = get_acpihid_device_id(dev, &entry); if (devid < 0) return ERR_PTR(devid); list_for_each_entry(p, &acpihid_map, list) { if ((devid == p->devid) && p->group) entry->group = p->group; } if (!entry->group) entry->group = generic_device_group(dev); else iommu_group_ref_get(entry->group); return entry->group; } static bool pci_iommuv2_capable(struct pci_dev *pdev) { static const int caps[] = { PCI_EXT_CAP_ID_ATS, PCI_EXT_CAP_ID_PRI, PCI_EXT_CAP_ID_PASID, }; int i, pos; if (pci_ats_disabled()) return false; for (i = 0; i < 3; ++i) { pos = pci_find_ext_capability(pdev, caps[i]); if (pos == 0) return false; } return true; } static bool pdev_pri_erratum(struct pci_dev *pdev, u32 erratum) { struct iommu_dev_data *dev_data; dev_data = get_dev_data(&pdev->dev); return dev_data->errata & (1 << erratum) ? true : false; } /* * This function checks if the driver got a valid device from the caller to * avoid dereferencing invalid pointers. */ static bool check_device(struct device *dev) { int devid; if (!dev || !dev->dma_mask) return false; devid = get_device_id(dev); if (devid < 0) return false; /* Out of our scope? */ if (devid > amd_iommu_last_bdf) return false; if (amd_iommu_rlookup_table[devid] == NULL) return false; return true; } static void init_iommu_group(struct device *dev) { struct iommu_group *group; group = iommu_group_get_for_dev(dev); if (IS_ERR(group)) return; iommu_group_put(group); } static int iommu_init_device(struct device *dev) { struct iommu_dev_data *dev_data; struct amd_iommu *iommu; int devid; if (dev->archdata.iommu) return 0; devid = get_device_id(dev); if (devid < 0) return devid; iommu = amd_iommu_rlookup_table[devid]; dev_data = find_dev_data(devid); if (!dev_data) return -ENOMEM; dev_data->alias = get_alias(dev); /* * By default we use passthrough mode for IOMMUv2 capable device. * But if amd_iommu=force_isolation is set (e.g. to debug DMA to * invalid address), we ignore the capability for the device so * it'll be forced to go into translation mode. */ if ((iommu_pass_through || !amd_iommu_force_isolation) && dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) { struct amd_iommu *iommu; iommu = amd_iommu_rlookup_table[dev_data->devid]; dev_data->iommu_v2 = iommu->is_iommu_v2; } dev->archdata.iommu = dev_data; iommu_device_link(&iommu->iommu, dev); return 0; } static void iommu_ignore_device(struct device *dev) { u16 alias; int devid; devid = get_device_id(dev); if (devid < 0) return; alias = get_alias(dev); memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry)); memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry)); amd_iommu_rlookup_table[devid] = NULL; amd_iommu_rlookup_table[alias] = NULL; } static void iommu_uninit_device(struct device *dev) { struct iommu_dev_data *dev_data; struct amd_iommu *iommu; int devid; devid = get_device_id(dev); if (devid < 0) return; iommu = amd_iommu_rlookup_table[devid]; dev_data = search_dev_data(devid); if (!dev_data) return; if (dev_data->domain) detach_device(dev); iommu_device_unlink(&iommu->iommu, dev); iommu_group_remove_device(dev); /* Remove dma-ops */ dev->dma_ops = NULL; /* * We keep dev_data around for unplugged devices and reuse it when the * device is re-plugged - not doing so would introduce a ton of races. */ } /**************************************************************************** * * Interrupt handling functions * ****************************************************************************/ static void dump_dte_entry(u16 devid) { int i; for (i = 0; i < 4; ++i) pr_err("DTE[%d]: %016llx\n", i, amd_iommu_dev_table[devid].data[i]); } static void dump_command(unsigned long phys_addr) { struct iommu_cmd *cmd = iommu_phys_to_virt(phys_addr); int i; for (i = 0; i < 4; ++i) pr_err("CMD[%d]: %08x\n", i, cmd->data[i]); } static void amd_iommu_report_page_fault(u16 devid, u16 domain_id, u64 address, int flags) { struct iommu_dev_data *dev_data = NULL; struct pci_dev *pdev; pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid), devid & 0xff); if (pdev) dev_data = get_dev_data(&pdev->dev); if (dev_data && __ratelimit(&dev_data->rs)) { pci_err(pdev, "Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%llx flags=0x%04x]\n", domain_id, address, flags); } else if (printk_ratelimit()) { pr_err("Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), domain_id, address, flags); } if (pdev) pci_dev_put(pdev); } static void iommu_print_event(struct amd_iommu *iommu, void *__evt) { struct device *dev = iommu->iommu.dev; int type, devid, pasid, flags, tag; volatile u32 *event = __evt; int count = 0; u64 address; retry: type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; pasid = PPR_PASID(*(u64 *)&event[0]); flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; address = (u64)(((u64)event[3]) << 32) | event[2]; if (type == 0) { /* Did we hit the erratum? */ if (++count == LOOP_TIMEOUT) { pr_err("No event written to event log\n"); return; } udelay(1); goto retry; } if (type == EVENT_TYPE_IO_FAULT) { amd_iommu_report_page_fault(devid, pasid, address, flags); return; } switch (type) { case EVENT_TYPE_ILL_DEV: dev_err(dev, "Event logged [ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), pasid, address, flags); dump_dte_entry(devid); break; case EVENT_TYPE_DEV_TAB_ERR: dev_err(dev, "Event logged [DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " "address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), address, flags); break; case EVENT_TYPE_PAGE_TAB_ERR: dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), pasid, address, flags); break; case EVENT_TYPE_ILL_CMD: dev_err(dev, "Event logged [ILLEGAL_COMMAND_ERROR address=0x%llx]\n", address); dump_command(address); break; case EVENT_TYPE_CMD_HARD_ERR: dev_err(dev, "Event logged [COMMAND_HARDWARE_ERROR address=0x%llx flags=0x%04x]\n", address, flags); break; case EVENT_TYPE_IOTLB_INV_TO: dev_err(dev, "Event logged [IOTLB_INV_TIMEOUT device=%02x:%02x.%x address=0x%llx]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), address); break; case EVENT_TYPE_INV_DEV_REQ: dev_err(dev, "Event logged [INVALID_DEVICE_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), pasid, address, flags); break; case EVENT_TYPE_INV_PPR_REQ: pasid = ((event[0] >> 16) & 0xFFFF) | ((event[1] << 6) & 0xF0000); tag = event[1] & 0x03FF; dev_err(dev, "Event logged [INVALID_PPR_REQUEST device=%02x:%02x.%x pasid=0x%05x address=0x%llx flags=0x%04x]\n", PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), pasid, address, flags); break; default: dev_err(dev, "Event logged [UNKNOWN event[0]=0x%08x event[1]=0x%08x event[2]=0x%08x event[3]=0x%08x\n", event[0], event[1], event[2], event[3]); } memset(__evt, 0, 4 * sizeof(u32)); } static void iommu_poll_events(struct amd_iommu *iommu) { u32 head, tail; head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); while (head != tail) { iommu_print_event(iommu, iommu->evt_buf + head); head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE; } writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); } static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw) { struct amd_iommu_fault fault; if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) { pr_err_ratelimited("Unknown PPR request received\n"); return; } fault.address = raw[1]; fault.pasid = PPR_PASID(raw[0]); fault.device_id = PPR_DEVID(raw[0]); fault.tag = PPR_TAG(raw[0]); fault.flags = PPR_FLAGS(raw[0]); atomic_notifier_call_chain(&ppr_notifier, 0, &fault); } static void iommu_poll_ppr_log(struct amd_iommu *iommu) { u32 head, tail; if (iommu->ppr_log == NULL) return; head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); while (head != tail) { volatile u64 *raw; u64 entry[2]; int i; raw = (u64 *)(iommu->ppr_log + head); /* * Hardware bug: Interrupt may arrive before the entry is * written to memory. If this happens we need to wait for the * entry to arrive. */ for (i = 0; i < LOOP_TIMEOUT; ++i) { if (PPR_REQ_TYPE(raw[0]) != 0) break; udelay(1); } /* Avoid memcpy function-call overhead */ entry[0] = raw[0]; entry[1] = raw[1]; /* * To detect the hardware bug we need to clear the entry * back to zero. */ raw[0] = raw[1] = 0UL; /* Update head pointer of hardware ring-buffer */ head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE; writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); /* Handle PPR entry */ iommu_handle_ppr_entry(iommu, entry); /* Refresh ring-buffer information */ head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); } } #ifdef CONFIG_IRQ_REMAP static int (*iommu_ga_log_notifier)(u32); int amd_iommu_register_ga_log_notifier(int (*notifier)(u32)) { iommu_ga_log_notifier = notifier; return 0; } EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier); static void iommu_poll_ga_log(struct amd_iommu *iommu) { u32 head, tail, cnt = 0; if (iommu->ga_log == NULL) return; head = readl(iommu->mmio_base + MMIO_GA_HEAD_OFFSET); tail = readl(iommu->mmio_base + MMIO_GA_TAIL_OFFSET); while (head != tail) { volatile u64 *raw; u64 log_entry; raw = (u64 *)(iommu->ga_log + head); cnt++; /* Avoid memcpy function-call overhead */ log_entry = *raw; /* Update head pointer of hardware ring-buffer */ head = (head + GA_ENTRY_SIZE) % GA_LOG_SIZE; writel(head, iommu->mmio_base + MMIO_GA_HEAD_OFFSET); /* Handle GA entry */ switch (GA_REQ_TYPE(log_entry)) { case GA_GUEST_NR: if (!iommu_ga_log_notifier) break; pr_debug("%s: devid=%#x, ga_tag=%#x\n", __func__, GA_DEVID(log_entry), GA_TAG(log_entry)); if (iommu_ga_log_notifier(GA_TAG(log_entry)) != 0) pr_err("GA log notifier failed.\n"); break; default: break; } } } #endif /* CONFIG_IRQ_REMAP */ #define AMD_IOMMU_INT_MASK \ (MMIO_STATUS_EVT_INT_MASK | \ MMIO_STATUS_PPR_INT_MASK | \ MMIO_STATUS_GALOG_INT_MASK) irqreturn_t amd_iommu_int_thread(int irq, void *data) { struct amd_iommu *iommu = (struct amd_iommu *) data; u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); while (status & AMD_IOMMU_INT_MASK) { /* Enable EVT and PPR and GA interrupts again */ writel(AMD_IOMMU_INT_MASK, iommu->mmio_base + MMIO_STATUS_OFFSET); if (status & MMIO_STATUS_EVT_INT_MASK) { pr_devel("Processing IOMMU Event Log\n"); iommu_poll_events(iommu); } if (status & MMIO_STATUS_PPR_INT_MASK) { pr_devel("Processing IOMMU PPR Log\n"); iommu_poll_ppr_log(iommu); } #ifdef CONFIG_IRQ_REMAP if (status & MMIO_STATUS_GALOG_INT_MASK) { pr_devel("Processing IOMMU GA Log\n"); iommu_poll_ga_log(iommu); } #endif /* * Hardware bug: ERBT1312 * When re-enabling interrupt (by writing 1 * to clear the bit), the hardware might also try to set * the interrupt bit in the event status register. * In this scenario, the bit will be set, and disable * subsequent interrupts. * * Workaround: The IOMMU driver should read back the * status register and check if the interrupt bits are cleared. * If not, driver will need to go through the interrupt handler * again and re-clear the bits */ status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); } return IRQ_HANDLED; } irqreturn_t amd_iommu_int_handler(int irq, void *data) { return IRQ_WAKE_THREAD; } /**************************************************************************** * * IOMMU command queuing functions * ****************************************************************************/ static int wait_on_sem(volatile u64 *sem) { int i = 0; while (*sem == 0 && i < LOOP_TIMEOUT) { udelay(1); i += 1; } if (i == LOOP_TIMEOUT) { pr_alert("Completion-Wait loop timed out\n"); return -EIO; } return 0; } static void copy_cmd_to_buffer(struct amd_iommu *iommu, struct iommu_cmd *cmd) { u8 *target; target = iommu->cmd_buf + iommu->cmd_buf_tail; iommu->cmd_buf_tail += sizeof(*cmd); iommu->cmd_buf_tail %= CMD_BUFFER_SIZE; /* Copy command to buffer */ memcpy(target, cmd, sizeof(*cmd)); /* Tell the IOMMU about it */ writel(iommu->cmd_buf_tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); } static void build_completion_wait(struct iommu_cmd *cmd, u64 address) { u64 paddr = iommu_virt_to_phys((void *)address); WARN_ON(address & 0x7ULL); memset(cmd, 0, sizeof(*cmd)); cmd->data[0] = lower_32_bits(paddr) | CMD_COMPL_WAIT_STORE_MASK; cmd->data[1] = upper_32_bits(paddr); cmd->data[2] = 1; CMD_SET_TYPE(cmd, CMD_COMPL_WAIT); } static void build_inv_dte(struct iommu_cmd *cmd, u16 devid) { memset(cmd, 0, sizeof(*cmd)); cmd->data[0] = devid; CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY); } static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, size_t size, u16 domid, int pde) { u64 pages; bool s; pages = iommu_num_pages(address, size, PAGE_SIZE); s = false; if (pages > 1) { /* * If we have to flush more than one page, flush all * TLB entries for this domain */ address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; s = true; } address &= PAGE_MASK; memset(cmd, 0, sizeof(*cmd)); cmd->data[1] |= domid; cmd->data[2] = lower_32_bits(address); cmd->data[3] = upper_32_bits(address); CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); if (s) /* size bit - we flush more than one 4kb page */ cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; if (pde) /* PDE bit - we want to flush everything, not only the PTEs */ cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; } static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep, u64 address, size_t size) { u64 pages; bool s; pages = iommu_num_pages(address, size, PAGE_SIZE); s = false; if (pages > 1) { /* * If we have to flush more than one page, flush all * TLB entries for this domain */ address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; s = true; } address &= PAGE_MASK; memset(cmd, 0, sizeof(*cmd)); cmd->data[0] = devid; cmd->data[0] |= (qdep & 0xff) << 24; cmd->data[1] = devid; cmd->data[2] = lower_32_bits(address); cmd->data[3] = upper_32_bits(address); CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES); if (s) cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; } static void build_inv_iommu_pasid(struct iommu_cmd *cmd, u16 domid, int pasid, u64 address, bool size) { memset(cmd, 0, sizeof(*cmd)); address &= ~(0xfffULL); cmd->data[0] = pasid; cmd->data[1] = domid; cmd->data[2] = lower_32_bits(address); cmd->data[3] = upper_32_bits(address); cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK; if (size) cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); } static void build_inv_iotlb_pasid(struct iommu_cmd *cmd, u16 devid, int pasid, int qdep, u64 address, bool size) { memset(cmd, 0, sizeof(*cmd)); address &= ~(0xfffULL); cmd->data[0] = devid; cmd->data[0] |= ((pasid >> 8) & 0xff) << 16; cmd->data[0] |= (qdep & 0xff) << 24; cmd->data[1] = devid; cmd->data[1] |= (pasid & 0xff) << 16; cmd->data[2] = lower_32_bits(address); cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK; cmd->data[3] = upper_32_bits(address); if (size) cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES); } static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, int pasid, int status, int tag, bool gn) { memset(cmd, 0, sizeof(*cmd)); cmd->data[0] = devid; if (gn) { cmd->data[1] = pasid; cmd->data[2] = CMD_INV_IOMMU_PAGES_GN_MASK; } cmd->data[3] = tag & 0x1ff; cmd->data[3] |= (status & PPR_STATUS_MASK) << PPR_STATUS_SHIFT; CMD_SET_TYPE(cmd, CMD_COMPLETE_PPR); } static void build_inv_all(struct iommu_cmd *cmd) { memset(cmd, 0, sizeof(*cmd)); CMD_SET_TYPE(cmd, CMD_INV_ALL); } static void build_inv_irt(struct iommu_cmd *cmd, u16 devid) { memset(cmd, 0, sizeof(*cmd)); cmd->data[0] = devid; CMD_SET_TYPE(cmd, CMD_INV_IRT); } /* * Writes the command to the IOMMUs command buffer and informs the * hardware about the new command. */ static int __iommu_queue_command_sync(struct amd_iommu *iommu, struct iommu_cmd *cmd, bool sync) { unsigned int count = 0; u32 left, next_tail; next_tail = (iommu->cmd_buf_tail + sizeof(*cmd)) % CMD_BUFFER_SIZE; again: left = (iommu->cmd_buf_head - next_tail) % CMD_BUFFER_SIZE; if (left <= 0x20) { /* Skip udelay() the first time around */ if (count++) { if (count == LOOP_TIMEOUT) { pr_err("Command buffer timeout\n"); return -EIO; } udelay(1); } /* Update head and recheck remaining space */ iommu->cmd_buf_head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); goto again; } copy_cmd_to_buffer(iommu, cmd); /* Do we need to make sure all commands are processed? */ iommu->need_sync = sync; return 0; } static int iommu_queue_command_sync(struct amd_iommu *iommu, struct iommu_cmd *cmd, bool sync) { unsigned long flags; int ret; raw_spin_lock_irqsave(&iommu->lock, flags); ret = __iommu_queue_command_sync(iommu, cmd, sync); raw_spin_unlock_irqrestore(&iommu->lock, flags); return ret; } static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) { return iommu_queue_command_sync(iommu, cmd, true); } /* * This function queues a completion wait command into the command * buffer of an IOMMU */ static int iommu_completion_wait(struct amd_iommu *iommu) { struct iommu_cmd cmd; unsigned long flags; int ret; if (!iommu->need_sync) return 0; build_completion_wait(&cmd, (u64)&iommu->cmd_sem); raw_spin_lock_irqsave(&iommu->lock, flags); iommu->cmd_sem = 0; ret = __iommu_queue_command_sync(iommu, &cmd, false); if (ret) goto out_unlock; ret = wait_on_sem(&iommu->cmd_sem); out_unlock: raw_spin_unlock_irqrestore(&iommu->lock, flags); return ret; } static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid) { struct iommu_cmd cmd; build_inv_dte(&cmd, devid); return iommu_queue_command(iommu, &cmd); } static void amd_iommu_flush_dte_all(struct amd_iommu *iommu) { u32 devid; for (devid = 0; devid <= 0xffff; ++devid) iommu_flush_dte(iommu, devid); iommu_completion_wait(iommu); } /* * This function uses heavy locking and may disable irqs for some time. But * this is no issue because it is only called during resume. */ static void amd_iommu_flush_tlb_all(struct amd_iommu *iommu) { u32 dom_id; for (dom_id = 0; dom_id <= 0xffff; ++dom_id) { struct iommu_cmd cmd; build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, dom_id, 1); iommu_queue_command(iommu, &cmd); } iommu_completion_wait(iommu); } static void amd_iommu_flush_all(struct amd_iommu *iommu) { struct iommu_cmd cmd; build_inv_all(&cmd); iommu_queue_command(iommu, &cmd); iommu_completion_wait(iommu); } static void iommu_flush_irt(struct amd_iommu *iommu, u16 devid) { struct iommu_cmd cmd; build_inv_irt(&cmd, devid); iommu_queue_command(iommu, &cmd); } static void amd_iommu_flush_irt_all(struct amd_iommu *iommu) { u32 devid; for (devid = 0; devid <= MAX_DEV_TABLE_ENTRIES; devid++) iommu_flush_irt(iommu, devid); iommu_completion_wait(iommu); } void iommu_flush_all_caches(struct amd_iommu *iommu) { if (iommu_feature(iommu, FEATURE_IA)) { amd_iommu_flush_all(iommu); } else { amd_iommu_flush_dte_all(iommu); amd_iommu_flush_irt_all(iommu); amd_iommu_flush_tlb_all(iommu); } } /* * Command send function for flushing on-device TLB */ static int device_flush_iotlb(struct iommu_dev_data *dev_data, u64 address, size_t size) { struct amd_iommu *iommu; struct iommu_cmd cmd; int qdep; qdep = dev_data->ats.qdep; iommu = amd_iommu_rlookup_table[dev_data->devid]; build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size); return iommu_queue_command(iommu, &cmd); } /* * Command send function for invalidating a device table entry */ static int device_flush_dte(struct iommu_dev_data *dev_data) { struct amd_iommu *iommu; u16 alias; int ret; iommu = amd_iommu_rlookup_table[dev_data->devid]; alias = dev_data->alias; ret = iommu_flush_dte(iommu, dev_data->devid); if (!ret && alias != dev_data->devid) ret = iommu_flush_dte(iommu, alias); if (ret) return ret; if (dev_data->ats.enabled) ret = device_flush_iotlb(dev_data, 0, ~0UL); return ret; } /* * TLB invalidation function which is called from the mapping functions. * It invalidates a single PTE if the range to flush is within a single * page. Otherwise it flushes the whole TLB of the IOMMU. */ static void __domain_flush_pages(struct protection_domain *domain, u64 address, size_t size, int pde) { struct iommu_dev_data *dev_data; struct iommu_cmd cmd; int ret = 0, i; build_inv_iommu_pages(&cmd, address, size, domain->id, pde); for (i = 0; i < amd_iommu_get_num_iommus(); ++i) { if (!domain->dev_iommu[i]) continue; /* * Devices of this domain are behind this IOMMU * We need a TLB flush */ ret |= iommu_queue_command(amd_iommus[i], &cmd); } list_for_each_entry(dev_data, &domain->dev_list, list) { if (!dev_data->ats.enabled) continue; ret |= device_flush_iotlb(dev_data, address, size); } WARN_ON(ret); } static void domain_flush_pages(struct protection_domain *domain, u64 address, size_t size) { __domain_flush_pages(domain, address, size, 0); } /* Flush the whole IO/TLB for a given protection domain */ static void domain_flush_tlb(struct protection_domain *domain) { __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0); } /* Flush the whole IO/TLB for a given protection domain - including PDE */ static void domain_flush_tlb_pde(struct protection_domain *domain) { __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1); } static void domain_flush_complete(struct protection_domain *domain) { int i; for (i = 0; i < amd_iommu_get_num_iommus(); ++i) { if (domain && !domain->dev_iommu[i]) continue; /* * Devices of this domain are behind this IOMMU * We need to wait for completion of all commands. */ iommu_completion_wait(amd_iommus[i]); } } /* * This function flushes the DTEs for all devices in domain */ static void domain_flush_devices(struct protection_domain *domain) { struct iommu_dev_data *dev_data; list_for_each_entry(dev_data, &domain->dev_list, list) device_flush_dte(dev_data); } /**************************************************************************** * * The functions below are used the create the page table mappings for * unity mapped regions. * ****************************************************************************/ static void free_page_list(struct page *freelist) { while (freelist != NULL) { unsigned long p = (unsigned long)page_address(freelist); freelist = freelist->freelist; free_page(p); } } static struct page *free_pt_page(unsigned long pt, struct page *freelist) { struct page *p = virt_to_page((void *)pt); p->freelist = freelist; return p; } #define DEFINE_FREE_PT_FN(LVL, FN) \ static struct page *free_pt_##LVL (unsigned long __pt, struct page *freelist) \ { \ unsigned long p; \ u64 *pt; \ int i; \ \ pt = (u64 *)__pt; \ \ for (i = 0; i < 512; ++i) { \ /* PTE present? */ \ if (!IOMMU_PTE_PRESENT(pt[i])) \ continue; \ \ /* Large PTE? */ \ if (PM_PTE_LEVEL(pt[i]) == 0 || \ PM_PTE_LEVEL(pt[i]) == 7) \ continue; \ \ p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \ freelist = FN(p, freelist); \ } \ \ return free_pt_page((unsigned long)pt, freelist); \ } DEFINE_FREE_PT_FN(l2, free_pt_page) DEFINE_FREE_PT_FN(l3, free_pt_l2) DEFINE_FREE_PT_FN(l4, free_pt_l3) DEFINE_FREE_PT_FN(l5, free_pt_l4) DEFINE_FREE_PT_FN(l6, free_pt_l5) static struct page *free_sub_pt(unsigned long root, int mode, struct page *freelist) { switch (mode) { case PAGE_MODE_NONE: case PAGE_MODE_7_LEVEL: break; case PAGE_MODE_1_LEVEL: freelist = free_pt_page(root, freelist); break; case PAGE_MODE_2_LEVEL: freelist = free_pt_l2(root, freelist); break; case PAGE_MODE_3_LEVEL: freelist = free_pt_l3(root, freelist); break; case PAGE_MODE_4_LEVEL: freelist = free_pt_l4(root, freelist); break; case PAGE_MODE_5_LEVEL: freelist = free_pt_l5(root, freelist); break; case PAGE_MODE_6_LEVEL: freelist = free_pt_l6(root, freelist); break; default: BUG(); } return freelist; } static void free_pagetable(struct protection_domain *domain) { unsigned long root = (unsigned long)domain->pt_root; struct page *freelist = NULL; BUG_ON(domain->mode < PAGE_MODE_NONE || domain->mode > PAGE_MODE_6_LEVEL); free_sub_pt(root, domain->mode, freelist); free_page_list(freelist); } /* * This function is used to add another level to an IO page table. Adding * another level increases the size of the address space by 9 bits to a size up * to 64 bits. */ static bool increase_address_space(struct protection_domain *domain, gfp_t gfp) { u64 *pte; if (domain->mode == PAGE_MODE_6_LEVEL) /* address space already 64 bit large */ return false; pte = (void *)get_zeroed_page(gfp); if (!pte) return false; *pte = PM_LEVEL_PDE(domain->mode, iommu_virt_to_phys(domain->pt_root)); domain->pt_root = pte; domain->mode += 1; domain->updated = true; return true; } static u64 *alloc_pte(struct protection_domain *domain, unsigned long address, unsigned long page_size, u64 **pte_page, gfp_t gfp) { int level, end_lvl; u64 *pte, *page; BUG_ON(!is_power_of_2(page_size)); while (address > PM_LEVEL_SIZE(domain->mode)) increase_address_space(domain, gfp); level = domain->mode - 1; pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; address = PAGE_SIZE_ALIGN(address, page_size); end_lvl = PAGE_SIZE_LEVEL(page_size); while (level > end_lvl) { u64 __pte, __npte; int pte_level; __pte = *pte; pte_level = PM_PTE_LEVEL(__pte); if (!IOMMU_PTE_PRESENT(__pte) || pte_level == PAGE_MODE_7_LEVEL) { page = (u64 *)get_zeroed_page(gfp); if (!page) return NULL; __npte = PM_LEVEL_PDE(level, iommu_virt_to_phys(page)); /* pte could have been changed somewhere. */ if (cmpxchg64(pte, __pte, __npte) != __pte) free_page((unsigned long)page); else if (pte_level == PAGE_MODE_7_LEVEL) domain->updated = true; continue; } /* No level skipping support yet */ if (pte_level != level) return NULL; level -= 1; pte = IOMMU_PTE_PAGE(__pte); if (pte_page && level == end_lvl) *pte_page = pte; pte = &pte[PM_LEVEL_INDEX(level, address)]; } return pte; } /* * This function checks if there is a PTE for a given dma address. If * there is one, it returns the pointer to it. */ static u64 *fetch_pte(struct protection_domain *domain, unsigned long address, unsigned long *page_size) { int level; u64 *pte; *page_size = 0; if (address > PM_LEVEL_SIZE(domain->mode)) return NULL; level = domain->mode - 1; pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; *page_size = PTE_LEVEL_PAGE_SIZE(level); while (level > 0) { /* Not Present */ if (!IOMMU_PTE_PRESENT(*pte)) return NULL; /* Large PTE */ if (PM_PTE_LEVEL(*pte) == 7 || PM_PTE_LEVEL(*pte) == 0) break; /* No level skipping support yet */ if (PM_PTE_LEVEL(*pte) != level) return NULL; level -= 1; /* Walk to the next level */ pte = IOMMU_PTE_PAGE(*pte); pte = &pte[PM_LEVEL_INDEX(level, address)]; *page_size = PTE_LEVEL_PAGE_SIZE(level); } if (PM_PTE_LEVEL(*pte) == 0x07) { unsigned long pte_mask; /* * If we have a series of large PTEs, make * sure to return a pointer to the first one. */ *page_size = pte_mask = PTE_PAGE_SIZE(*pte); pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1); pte = (u64 *)(((unsigned long)pte) & pte_mask); } return pte; } static struct page *free_clear_pte(u64 *pte, u64 pteval, struct page *freelist) { unsigned long pt; int mode; while (cmpxchg64(pte, pteval, 0) != pteval) { pr_warn("AMD-Vi: IOMMU pte changed since we read it\n"); pteval = *pte; } if (!IOMMU_PTE_PRESENT(pteval)) return freelist; pt = (unsigned long)IOMMU_PTE_PAGE(pteval); mode = IOMMU_PTE_MODE(pteval); return free_sub_pt(pt, mode, freelist); } /* * Generic mapping functions. It maps a physical address into a DMA * address space. It allocates the page table pages if necessary. * In the future it can be extended to a generic mapping function * supporting all features of AMD IOMMU page tables like level skipping * and full 64 bit address spaces. */ static int iommu_map_page(struct protection_domain *dom, unsigned long bus_addr, unsigned long phys_addr, unsigned long page_size, int prot, gfp_t gfp) { struct page *freelist = NULL; u64 __pte, *pte; int i, count; BUG_ON(!IS_ALIGNED(bus_addr, page_size)); BUG_ON(!IS_ALIGNED(phys_addr, page_size)); if (!(prot & IOMMU_PROT_MASK)) return -EINVAL; count = PAGE_SIZE_PTE_COUNT(page_size); pte = alloc_pte(dom, bus_addr, page_size, NULL, gfp); if (!pte) return -ENOMEM; for (i = 0; i < count; ++i) freelist = free_clear_pte(&pte[i], pte[i], freelist); if (freelist != NULL) dom->updated = true; if (count > 1) { __pte = PAGE_SIZE_PTE(__sme_set(phys_addr), page_size); __pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_PR | IOMMU_PTE_FC; } else __pte = __sme_set(phys_addr) | IOMMU_PTE_PR | IOMMU_PTE_FC; if (prot & IOMMU_PROT_IR) __pte |= IOMMU_PTE_IR; if (prot & IOMMU_PROT_IW) __pte |= IOMMU_PTE_IW; for (i = 0; i < count; ++i) pte[i] = __pte; update_domain(dom); /* Everything flushed out, free pages now */ free_page_list(freelist); return 0; } static unsigned long iommu_unmap_page(struct protection_domain *dom, unsigned long bus_addr, unsigned long page_size) { unsigned long long unmapped; unsigned long unmap_size; u64 *pte; BUG_ON(!is_power_of_2(page_size)); unmapped = 0; while (unmapped < page_size) { pte = fetch_pte(dom, bus_addr, &unmap_size); if (pte) { int i, count; count = PAGE_SIZE_PTE_COUNT(unmap_size); for (i = 0; i < count; i++) pte[i] = 0ULL; } bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size; unmapped += unmap_size; } BUG_ON(unmapped && !is_power_of_2(unmapped)); return unmapped; } /**************************************************************************** * * The next functions belong to the address allocator for the dma_ops * interface functions. * ****************************************************************************/ static unsigned long dma_ops_alloc_iova(struct device *dev, struct dma_ops_domain *dma_dom, unsigned int pages, u64 dma_mask) { unsigned long pfn = 0; pages = __roundup_pow_of_two(pages); if (dma_mask > DMA_BIT_MASK(32)) pfn = alloc_iova_fast(&dma_dom->iovad, pages, IOVA_PFN(DMA_BIT_MASK(32)), false); if (!pfn) pfn = alloc_iova_fast(&dma_dom->iovad, pages, IOVA_PFN(dma_mask), true); return (pfn << PAGE_SHIFT); } static void dma_ops_free_iova(struct dma_ops_domain *dma_dom, unsigned long address, unsigned int pages) { pages = __roundup_pow_of_two(pages); address >>= PAGE_SHIFT; free_iova_fast(&dma_dom->iovad, address, pages); } /**************************************************************************** * * The next functions belong to the domain allocation. A domain is * allocated for every IOMMU as the default domain. If device isolation * is enabled, every device get its own domain. The most important thing * about domains is the page table mapping the DMA address space they * contain. * ****************************************************************************/ static u16 domain_id_alloc(void) { int id; spin_lock(&pd_bitmap_lock); id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); BUG_ON(id == 0); if (id > 0 && id < MAX_DOMAIN_ID) __set_bit(id, amd_iommu_pd_alloc_bitmap); else id = 0; spin_unlock(&pd_bitmap_lock); return id; } static void domain_id_free(int id) { spin_lock(&pd_bitmap_lock); if (id > 0 && id < MAX_DOMAIN_ID) __clear_bit(id, amd_iommu_pd_alloc_bitmap); spin_unlock(&pd_bitmap_lock); } static void free_gcr3_tbl_level1(u64 *tbl) { u64 *ptr; int i; for (i = 0; i < 512; ++i) { if (!(tbl[i] & GCR3_VALID)) continue; ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK); free_page((unsigned long)ptr); } } static void free_gcr3_tbl_level2(u64 *tbl) { u64 *ptr; int i; for (i = 0; i < 512; ++i) { if (!(tbl[i] & GCR3_VALID)) continue; ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK); free_gcr3_tbl_level1(ptr); } } static void free_gcr3_table(struct protection_domain *domain) { if (domain->glx == 2) free_gcr3_tbl_level2(domain->gcr3_tbl); else if (domain->glx == 1) free_gcr3_tbl_level1(domain->gcr3_tbl); else BUG_ON(domain->glx != 0); free_page((unsigned long)domain->gcr3_tbl); } static void dma_ops_domain_flush_tlb(struct dma_ops_domain *dom) { domain_flush_tlb(&dom->domain); domain_flush_complete(&dom->domain); } static void iova_domain_flush_tlb(struct iova_domain *iovad) { struct dma_ops_domain *dom; dom = container_of(iovad, struct dma_ops_domain, iovad); dma_ops_domain_flush_tlb(dom); } /* * Free a domain, only used if something went wrong in the * allocation path and we need to free an already allocated page table */ static void dma_ops_domain_free(struct dma_ops_domain *dom) { if (!dom) return; put_iova_domain(&dom->iovad); free_pagetable(&dom->domain); if (dom->domain.id) domain_id_free(dom->domain.id); kfree(dom); } /* * Allocates a new protection domain usable for the dma_ops functions. * It also initializes the page table and the address allocator data * structures required for the dma_ops interface */ static struct dma_ops_domain *dma_ops_domain_alloc(void) { struct dma_ops_domain *dma_dom; dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL); if (!dma_dom) return NULL; if (protection_domain_init(&dma_dom->domain)) goto free_dma_dom; dma_dom->domain.mode = PAGE_MODE_3_LEVEL; dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); dma_dom->domain.flags = PD_DMA_OPS_MASK; if (!dma_dom->domain.pt_root) goto free_dma_dom; init_iova_domain(&dma_dom->iovad, PAGE_SIZE, IOVA_START_PFN); if (init_iova_flush_queue(&dma_dom->iovad, iova_domain_flush_tlb, NULL)) goto free_dma_dom; /* Initialize reserved ranges */ copy_reserved_iova(&reserved_iova_ranges, &dma_dom->iovad); return dma_dom; free_dma_dom: dma_ops_domain_free(dma_dom); return NULL; } /* * little helper function to check whether a given protection domain is a * dma_ops domain */ static bool dma_ops_domain(struct protection_domain *domain) { return domain->flags & PD_DMA_OPS_MASK; } static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats, bool ppr) { u64 pte_root = 0; u64 flags = 0; if (domain->mode != PAGE_MODE_NONE) pte_root = iommu_virt_to_phys(domain->pt_root); pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) << DEV_ENTRY_MODE_SHIFT; pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV; flags = amd_iommu_dev_table[devid].data[1]; if (ats) flags |= DTE_FLAG_IOTLB; if (ppr) { struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; if (iommu_feature(iommu, FEATURE_EPHSUP)) pte_root |= 1ULL << DEV_ENTRY_PPR; } if (domain->flags & PD_IOMMUV2_MASK) { u64 gcr3 = iommu_virt_to_phys(domain->gcr3_tbl); u64 glx = domain->glx; u64 tmp; pte_root |= DTE_FLAG_GV; pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT; /* First mask out possible old values for GCR3 table */ tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B; flags &= ~tmp; tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C; flags &= ~tmp; /* Encode GCR3 table into DTE */ tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A; pte_root |= tmp; tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B; flags |= tmp; tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C; flags |= tmp; } flags &= ~DEV_DOMID_MASK; flags |= domain->id; amd_iommu_dev_table[devid].data[1] = flags; amd_iommu_dev_table[devid].data[0] = pte_root; } static void clear_dte_entry(u16 devid) { /* remove entry from the device table seen by the hardware */ amd_iommu_dev_table[devid].data[0] = DTE_FLAG_V | DTE_FLAG_TV; amd_iommu_dev_table[devid].data[1] &= DTE_FLAG_MASK; amd_iommu_apply_erratum_63(devid); } static void do_attach(struct iommu_dev_data *dev_data, struct protection_domain *domain) { struct amd_iommu *iommu; u16 alias; bool ats; iommu = amd_iommu_rlookup_table[dev_data->devid]; alias = dev_data->alias; ats = dev_data->ats.enabled; /* Update data structures */ dev_data->domain = domain; list_add(&dev_data->list, &domain->dev_list); /* Do reference counting */ domain->dev_iommu[iommu->index] += 1; domain->dev_cnt += 1; /* Update device table */ set_dte_entry(dev_data->devid, domain, ats, dev_data->iommu_v2); if (alias != dev_data->devid) set_dte_entry(alias, domain, ats, dev_data->iommu_v2); device_flush_dte(dev_data); } static void do_detach(struct iommu_dev_data *dev_data) { struct protection_domain *domain = dev_data->domain; struct amd_iommu *iommu; u16 alias; iommu = amd_iommu_rlookup_table[dev_data->devid]; alias = dev_data->alias; /* Update data structures */ dev_data->domain = NULL; list_del(&dev_data->list); clear_dte_entry(dev_data->devid); if (alias != dev_data->devid) clear_dte_entry(alias); /* Flush the DTE entry */ device_flush_dte(dev_data); /* Flush IOTLB */ domain_flush_tlb_pde(domain); /* Wait for the flushes to finish */ domain_flush_complete(domain); /* decrease reference counters - needs to happen after the flushes */ domain->dev_iommu[iommu->index] -= 1; domain->dev_cnt -= 1; } /* * If a device is not yet associated with a domain, this function makes the * device visible in the domain */ static int __attach_device(struct iommu_dev_data *dev_data, struct protection_domain *domain) { int ret; /* lock domain */ spin_lock(&domain->lock); ret = -EBUSY; if (dev_data->domain != NULL) goto out_unlock; /* Attach alias group root */ do_attach(dev_data, domain); ret = 0; out_unlock: /* ready */ spin_unlock(&domain->lock); return ret; } static void pdev_iommuv2_disable(struct pci_dev *pdev) { pci_disable_ats(pdev); pci_disable_pri(pdev); pci_disable_pasid(pdev); } /* FIXME: Change generic reset-function to do the same */ static int pri_reset_while_enabled(struct pci_dev *pdev) { u16 control; int pos; pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); if (!pos) return -EINVAL; pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control); control |= PCI_PRI_CTRL_RESET; pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); return 0; } static int pdev_iommuv2_enable(struct pci_dev *pdev) { bool reset_enable; int reqs, ret; /* FIXME: Hardcode number of outstanding requests for now */ reqs = 32; if (pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE)) reqs = 1; reset_enable = pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_ENABLE_RESET); /* Only allow access to user-accessible pages */ ret = pci_enable_pasid(pdev, 0); if (ret) goto out_err; /* First reset the PRI state of the device */ ret = pci_reset_pri(pdev); if (ret) goto out_err; /* Enable PRI */ ret = pci_enable_pri(pdev, reqs); if (ret) goto out_err; if (reset_enable) { ret = pri_reset_while_enabled(pdev); if (ret) goto out_err; } ret = pci_enable_ats(pdev, PAGE_SHIFT); if (ret) goto out_err; return 0; out_err: pci_disable_pri(pdev); pci_disable_pasid(pdev); return ret; } /* * If a device is not yet associated with a domain, this function makes the * device visible in the domain */ static int attach_device(struct device *dev, struct protection_domain *domain) { struct pci_dev *pdev; struct iommu_dev_data *dev_data; unsigned long flags; int ret; dev_data = get_dev_data(dev); if (!dev_is_pci(dev)) goto skip_ats_check; pdev = to_pci_dev(dev); if (domain->flags & PD_IOMMUV2_MASK) { if (!dev_data->passthrough) return -EINVAL; if (dev_data->iommu_v2) { if (pdev_iommuv2_enable(pdev) != 0) return -EINVAL; dev_data->ats.enabled = true; dev_data->ats.qdep = pci_ats_queue_depth(pdev); dev_data->pri_tlp = pci_prg_resp_pasid_required(pdev); } } else if (amd_iommu_iotlb_sup && pci_enable_ats(pdev, PAGE_SHIFT) == 0) { dev_data->ats.enabled = true; dev_data->ats.qdep = pci_ats_queue_depth(pdev); } skip_ats_check: spin_lock_irqsave(&amd_iommu_devtable_lock, flags); ret = __attach_device(dev_data, domain); spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags); /* * We might boot into a crash-kernel here. The crashed kernel * left the caches in the IOMMU dirty. So we have to flush * here to evict all dirty stuff. */ domain_flush_tlb_pde(domain); return ret; } /* * Removes a device from a protection domain (unlocked) */ static void __detach_device(struct iommu_dev_data *dev_data) { struct protection_domain *domain; domain = dev_data->domain; spin_lock(&domain->lock); do_detach(dev_data); spin_unlock(&domain->lock); } /* * Removes a device from a protection domain (with devtable_lock held) */ static void detach_device(struct device *dev) { struct protection_domain *domain; struct iommu_dev_data *dev_data; unsigned long flags; dev_data = get_dev_data(dev); domain = dev_data->domain; /* * First check if the device is still attached. It might already * be detached from its domain because the generic * iommu_detach_group code detached it and we try again here in * our alias handling. */ if (WARN_ON(!dev_data->domain)) return; /* lock device table */ spin_lock_irqsave(&amd_iommu_devtable_lock, flags); __detach_device(dev_data); spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags); if (!dev_is_pci(dev)) return; if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2) pdev_iommuv2_disable(to_pci_dev(dev)); else if (dev_data->ats.enabled) pci_disable_ats(to_pci_dev(dev)); dev_data->ats.enabled = false; } static int amd_iommu_add_device(struct device *dev) { struct iommu_dev_data *dev_data; struct iommu_domain *domain; struct amd_iommu *iommu; int ret, devid; if (!check_device(dev) || get_dev_data(dev)) return 0; devid = get_device_id(dev); if (devid < 0) return devid; iommu = amd_iommu_rlookup_table[devid]; ret = iommu_init_device(dev); if (ret) { if (ret != -ENOTSUPP) dev_err(dev, "Failed to initialize - trying to proceed anyway\n"); iommu_ignore_device(dev); dev->dma_ops = NULL; goto out; } init_iommu_group(dev); dev_data = get_dev_data(dev); BUG_ON(!dev_data); if (iommu_pass_through || dev_data->iommu_v2) iommu_request_dm_for_dev(dev); /* Domains are initialized for this device - have a look what we ended up with */ domain = iommu_get_domain_for_dev(dev); if (domain->type == IOMMU_DOMAIN_IDENTITY) dev_data->passthrough = true; else dev->dma_ops = &amd_iommu_dma_ops; out: iommu_completion_wait(iommu); return 0; } static void amd_iommu_remove_device(struct device *dev) { struct amd_iommu *iommu; int devid; if (!check_device(dev)) return; devid = get_device_id(dev); if (devid < 0) return; iommu = amd_iommu_rlookup_table[devid]; iommu_uninit_device(dev); iommu_completion_wait(iommu); } static struct iommu_group *amd_iommu_device_group(struct device *dev) { if (dev_is_pci(dev)) return pci_device_group(dev); return acpihid_device_group(dev); } /***************************************************************************** * * The next functions belong to the dma_ops mapping/unmapping code. * *****************************************************************************/ /* * In the dma_ops path we only have the struct device. This function * finds the corresponding IOMMU, the protection domain and the * requestor id for a given device. * If the device is not yet associated with a domain this is also done * in this function. */ static struct protection_domain *get_domain(struct device *dev) { struct protection_domain *domain; struct iommu_domain *io_domain; if (!check_device(dev)) return ERR_PTR(-EINVAL); domain = get_dev_data(dev)->domain; if (domain == NULL && get_dev_data(dev)->defer_attach) { get_dev_data(dev)->defer_attach = false; io_domain = iommu_get_domain_for_dev(dev); domain = to_pdomain(io_domain); attach_device(dev, domain); } if (domain == NULL) return ERR_PTR(-EBUSY); if (!dma_ops_domain(domain)) return ERR_PTR(-EBUSY); return domain; } static void update_device_table(struct protection_domain *domain) { struct iommu_dev_data *dev_data; list_for_each_entry(dev_data, &domain->dev_list, list) { set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled, dev_data->iommu_v2); if (dev_data->devid == dev_data->alias) continue; /* There is an alias, update device table entry for it */ set_dte_entry(dev_data->alias, domain, dev_data->ats.enabled, dev_data->iommu_v2); } } static void update_domain(struct protection_domain *domain) { if (!domain->updated) return; update_device_table(domain); domain_flush_devices(domain); domain_flush_tlb_pde(domain); domain->updated = false; } static int dir2prot(enum dma_data_direction direction) { if (direction == DMA_TO_DEVICE) return IOMMU_PROT_IR; else if (direction == DMA_FROM_DEVICE) return IOMMU_PROT_IW; else if (direction == DMA_BIDIRECTIONAL) return IOMMU_PROT_IW | IOMMU_PROT_IR; else return 0; } /* * This function contains common code for mapping of a physically * contiguous memory region into DMA address space. It is used by all * mapping functions provided with this IOMMU driver. * Must be called with the domain lock held. */ static dma_addr_t __map_single(struct device *dev, struct dma_ops_domain *dma_dom, phys_addr_t paddr, size_t size, enum dma_data_direction direction, u64 dma_mask) { dma_addr_t offset = paddr & ~PAGE_MASK; dma_addr_t address, start, ret; unsigned int pages; int prot = 0; int i; pages = iommu_num_pages(paddr, size, PAGE_SIZE); paddr &= PAGE_MASK; address = dma_ops_alloc_iova(dev, dma_dom, pages, dma_mask); if (!address) goto out; prot = dir2prot(direction); start = address; for (i = 0; i < pages; ++i) { ret = iommu_map_page(&dma_dom->domain, start, paddr, PAGE_SIZE, prot, GFP_ATOMIC); if (ret) goto out_unmap; paddr += PAGE_SIZE; start += PAGE_SIZE; } address += offset; if (unlikely(amd_iommu_np_cache)) { domain_flush_pages(&dma_dom->domain, address, size); domain_flush_complete(&dma_dom->domain); } out: return address; out_unmap: for (--i; i >= 0; --i) { start -= PAGE_SIZE; iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE); } domain_flush_tlb(&dma_dom->domain); domain_flush_complete(&dma_dom->domain); dma_ops_free_iova(dma_dom, address, pages); return DMA_MAPPING_ERROR; } /* * Does the reverse of the __map_single function. Must be called with * the domain lock held too */ static void __unmap_single(struct dma_ops_domain *dma_dom, dma_addr_t dma_addr, size_t size, int dir) { dma_addr_t i, start; unsigned int pages; pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); dma_addr &= PAGE_MASK; start = dma_addr; for (i = 0; i < pages; ++i) { iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE); start += PAGE_SIZE; } if (amd_iommu_unmap_flush) { domain_flush_tlb(&dma_dom->domain); domain_flush_complete(&dma_dom->domain); dma_ops_free_iova(dma_dom, dma_addr, pages); } else { pages = __roundup_pow_of_two(pages); queue_iova(&dma_dom->iovad, dma_addr >> PAGE_SHIFT, pages, 0); } } /* * The exported map_single function for dma_ops. */ static dma_addr_t map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs) { phys_addr_t paddr = page_to_phys(page) + offset; struct protection_domain *domain; struct dma_ops_domain *dma_dom; u64 dma_mask; domain = get_domain(dev); if (PTR_ERR(domain) == -EINVAL) return (dma_addr_t)paddr; else if (IS_ERR(domain)) return DMA_MAPPING_ERROR; dma_mask = *dev->dma_mask; dma_dom = to_dma_ops_domain(domain); return __map_single(dev, dma_dom, paddr, size, dir, dma_mask); } /* * The exported unmap_single function for dma_ops. */ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction dir, unsigned long attrs) { struct protection_domain *domain; struct dma_ops_domain *dma_dom; domain = get_domain(dev); if (IS_ERR(domain)) return; dma_dom = to_dma_ops_domain(domain); __unmap_single(dma_dom, dma_addr, size, dir); } static int sg_num_pages(struct device *dev, struct scatterlist *sglist, int nelems) { unsigned long mask, boundary_size; struct scatterlist *s; int i, npages = 0; mask = dma_get_seg_boundary(dev); boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT : 1UL << (BITS_PER_LONG - PAGE_SHIFT); for_each_sg(sglist, s, nelems, i) { int p, n; s->dma_address = npages << PAGE_SHIFT; p = npages % boundary_size; n = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE); if (p + n > boundary_size) npages += boundary_size - p; npages += n; } return npages; } /* * The exported map_sg function for dma_ops (handles scatter-gather * lists). */ static int map_sg(struct device *dev, struct scatterlist *sglist, int nelems, enum dma_data_direction direction, unsigned long attrs) { int mapped_pages = 0, npages = 0, prot = 0, i; struct protection_domain *domain; struct dma_ops_domain *dma_dom; struct scatterlist *s; unsigned long address; u64 dma_mask; int ret; domain = get_domain(dev); if (IS_ERR(domain)) return 0; dma_dom = to_dma_ops_domain(domain); dma_mask = *dev->dma_mask; npages = sg_num_pages(dev, sglist, nelems); address = dma_ops_alloc_iova(dev, dma_dom, npages, dma_mask); if (address == DMA_MAPPING_ERROR) goto out_err; prot = dir2prot(direction); /* Map all sg entries */ for_each_sg(sglist, s, nelems, i) { int j, pages = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE); for (j = 0; j < pages; ++j) { unsigned long bus_addr, phys_addr; bus_addr = address + s->dma_address + (j << PAGE_SHIFT); phys_addr = (sg_phys(s) & PAGE_MASK) + (j << PAGE_SHIFT); ret = iommu_map_page(domain, bus_addr, phys_addr, PAGE_SIZE, prot, GFP_ATOMIC); if (ret) goto out_unmap; mapped_pages += 1; } } /* Everything is mapped - write the right values into s->dma_address */ for_each_sg(sglist, s, nelems, i) { /* * Add in the remaining piece of the scatter-gather offset that * was masked out when we were determining the physical address * via (sg_phys(s) & PAGE_MASK) earlier. */ s->dma_address += address + (s->offset & ~PAGE_MASK); s->dma_length = s->length; } return nelems; out_unmap: dev_err(dev, "IOMMU mapping error in map_sg (io-pages: %d reason: %d)\n", npages, ret); for_each_sg(sglist, s, nelems, i) { int j, pages = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE); for (j = 0; j < pages; ++j) { unsigned long bus_addr; bus_addr = address + s->dma_address + (j << PAGE_SHIFT); iommu_unmap_page(domain, bus_addr, PAGE_SIZE); if (--mapped_pages == 0) goto out_free_iova; } } out_free_iova: free_iova_fast(&dma_dom->iovad, address >> PAGE_SHIFT, npages); out_err: return 0; } /* * The exported map_sg function for dma_ops (handles scatter-gather * lists). */ static void unmap_sg(struct device *dev, struct scatterlist *sglist, int nelems, enum dma_data_direction dir, unsigned long attrs) { struct protection_domain *domain; struct dma_ops_domain *dma_dom; unsigned long startaddr; int npages = 2; domain = get_domain(dev); if (IS_ERR(domain)) return; startaddr = sg_dma_address(sglist) & PAGE_MASK; dma_dom = to_dma_ops_domain(domain); npages = sg_num_pages(dev, sglist, nelems); __unmap_single(dma_dom, startaddr, npages << PAGE_SHIFT, dir); } /* * The exported alloc_coherent function for dma_ops. */ static void *alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr, gfp_t flag, unsigned long attrs) { u64 dma_mask = dev->coherent_dma_mask; struct protection_domain *domain; struct dma_ops_domain *dma_dom; struct page *page; domain = get_domain(dev); if (PTR_ERR(domain) == -EINVAL) { page = alloc_pages(flag, get_order(size)); *dma_addr = page_to_phys(page); return page_address(page); } else if (IS_ERR(domain)) return NULL; dma_dom = to_dma_ops_domain(domain); size = PAGE_ALIGN(size); dma_mask = dev->coherent_dma_mask; flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); flag |= __GFP_ZERO; page = alloc_pages(flag | __GFP_NOWARN, get_order(size)); if (!page) { if (!gfpflags_allow_blocking(flag)) return NULL; page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, get_order(size), flag & __GFP_NOWARN); if (!page) return NULL; } if (!dma_mask) dma_mask = *dev->dma_mask; *dma_addr = __map_single(dev, dma_dom, page_to_phys(page), size, DMA_BIDIRECTIONAL, dma_mask); if (*dma_addr == DMA_MAPPING_ERROR) goto out_free; return page_address(page); out_free: if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT)) __free_pages(page, get_order(size)); return NULL; } /* * The exported free_coherent function for dma_ops. */ static void free_coherent(struct device *dev, size_t size, void *virt_addr, dma_addr_t dma_addr, unsigned long attrs) { struct protection_domain *domain; struct dma_ops_domain *dma_dom; struct page *page; page = virt_to_page(virt_addr); size = PAGE_ALIGN(size); domain = get_domain(dev); if (IS_ERR(domain)) goto free_mem; dma_dom = to_dma_ops_domain(domain); __unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL); free_mem: if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT)) __free_pages(page, get_order(size)); } /* * This function is called by the DMA layer to find out if we can handle a * particular device. It is part of the dma_ops. */ static int amd_iommu_dma_supported(struct device *dev, u64 mask) { if (!dma_direct_supported(dev, mask)) return 0; return check_device(dev); } static const struct dma_map_ops amd_iommu_dma_ops = { .alloc = alloc_coherent, .free = free_coherent, .map_page = map_page, .unmap_page = unmap_page, .map_sg = map_sg, .unmap_sg = unmap_sg, .dma_supported = amd_iommu_dma_supported, }; static int init_reserved_iova_ranges(void) { struct pci_dev *pdev = NULL; struct iova *val; init_iova_domain(&reserved_iova_ranges, PAGE_SIZE, IOVA_START_PFN); lockdep_set_class(&reserved_iova_ranges.iova_rbtree_lock, &reserved_rbtree_key); /* MSI memory range */ val = reserve_iova(&reserved_iova_ranges, IOVA_PFN(MSI_RANGE_START), IOVA_PFN(MSI_RANGE_END)); if (!val) { pr_err("Reserving MSI range failed\n"); return -ENOMEM; } /* HT memory range */ val = reserve_iova(&reserved_iova_ranges, IOVA_PFN(HT_RANGE_START), IOVA_PFN(HT_RANGE_END)); if (!val) { pr_err("Reserving HT range failed\n"); return -ENOMEM; } /* * Memory used for PCI resources * FIXME: Check whether we can reserve the PCI-hole completly */ for_each_pci_dev(pdev) { int i; for (i = 0; i < PCI_NUM_RESOURCES; ++i) { struct resource *r = &pdev->resource[i]; if (!(r->flags & IORESOURCE_MEM)) continue; val = reserve_iova(&reserved_iova_ranges, IOVA_PFN(r->start), IOVA_PFN(r->end)); if (!val) { pci_err(pdev, "Reserve pci-resource range %pR failed\n", r); return -ENOMEM; } } } return 0; } int __init amd_iommu_init_api(void) { int ret, err = 0; ret = iova_cache_get(); if (ret) return ret; ret = init_reserved_iova_ranges(); if (ret) return ret; err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops); if (err) return err; #ifdef CONFIG_ARM_AMBA err = bus_set_iommu(&amba_bustype, &amd_iommu_ops); if (err) return err; #endif err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops); if (err) return err; return 0; } int __init amd_iommu_init_dma_ops(void) { swiotlb = (iommu_pass_through || sme_me_mask) ? 1 : 0; iommu_detected = 1; if (amd_iommu_unmap_flush) pr_info("IO/TLB flush on unmap enabled\n"); else pr_info("Lazy IO/TLB flushing enabled\n"); return 0; } /***************************************************************************** * * The following functions belong to the exported interface of AMD IOMMU * * This interface allows access to lower level functions of the IOMMU * like protection domain handling and assignement of devices to domains * which is not possible with the dma_ops interface. * *****************************************************************************/ static void cleanup_domain(struct protection_domain *domain) { struct iommu_dev_data *entry; unsigned long flags; spin_lock_irqsave(&amd_iommu_devtable_lock, flags); while (!list_empty(&domain->dev_list)) { entry = list_first_entry(&domain->dev_list, struct iommu_dev_data, list); BUG_ON(!entry->domain); __detach_device(entry); } spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags); } static void protection_domain_free(struct protection_domain *domain) { if (!domain) return; if (domain->id) domain_id_free(domain->id); kfree(domain); } static int protection_domain_init(struct protection_domain *domain) { spin_lock_init(&domain->lock); mutex_init(&domain->api_lock); domain->id = domain_id_alloc(); if (!domain->id) return -ENOMEM; INIT_LIST_HEAD(&domain->dev_list); return 0; } static struct protection_domain *protection_domain_alloc(void) { struct protection_domain *domain; domain = kzalloc(sizeof(*domain), GFP_KERNEL); if (!domain) return NULL; if (protection_domain_init(domain)) goto out_err; return domain; out_err: kfree(domain); return NULL; } static struct iommu_domain *amd_iommu_domain_alloc(unsigned type) { struct protection_domain *pdomain; struct dma_ops_domain *dma_domain; switch (type) { case IOMMU_DOMAIN_UNMANAGED: pdomain = protection_domain_alloc(); if (!pdomain) return NULL; pdomain->mode = PAGE_MODE_3_LEVEL; pdomain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); if (!pdomain->pt_root) { protection_domain_free(pdomain); return NULL; } pdomain->domain.geometry.aperture_start = 0; pdomain->domain.geometry.aperture_end = ~0ULL; pdomain->domain.geometry.force_aperture = true; break; case IOMMU_DOMAIN_DMA: dma_domain = dma_ops_domain_alloc(); if (!dma_domain) { pr_err("Failed to allocate\n"); return NULL; } pdomain = &dma_domain->domain; break; case IOMMU_DOMAIN_IDENTITY: pdomain = protection_domain_alloc(); if (!pdomain) return NULL; pdomain->mode = PAGE_MODE_NONE; break; default: return NULL; } return &pdomain->domain; } static void amd_iommu_domain_free(struct iommu_domain *dom) { struct protection_domain *domain; struct dma_ops_domain *dma_dom; domain = to_pdomain(dom); if (domain->dev_cnt > 0) cleanup_domain(domain); BUG_ON(domain->dev_cnt != 0); if (!dom) return; switch (dom->type) { case IOMMU_DOMAIN_DMA: /* Now release the domain */ dma_dom = to_dma_ops_domain(domain); dma_ops_domain_free(dma_dom); break; default: if (domain->mode != PAGE_MODE_NONE) free_pagetable(domain); if (domain->flags & PD_IOMMUV2_MASK) free_gcr3_table(domain); protection_domain_free(domain); break; } } static void amd_iommu_detach_device(struct iommu_domain *dom, struct device *dev) { struct iommu_dev_data *dev_data = dev->archdata.iommu; struct amd_iommu *iommu; int devid; if (!check_device(dev)) return; devid = get_device_id(dev); if (devid < 0) return; if (dev_data->domain != NULL) detach_device(dev); iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return; #ifdef CONFIG_IRQ_REMAP if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) && (dom->type == IOMMU_DOMAIN_UNMANAGED)) dev_data->use_vapic = 0; #endif iommu_completion_wait(iommu); } static int amd_iommu_attach_device(struct iommu_domain *dom, struct device *dev) { struct protection_domain *domain = to_pdomain(dom); struct iommu_dev_data *dev_data; struct amd_iommu *iommu; int ret; if (!check_device(dev)) return -EINVAL; dev_data = dev->archdata.iommu; iommu = amd_iommu_rlookup_table[dev_data->devid]; if (!iommu) return -EINVAL; if (dev_data->domain) detach_device(dev); ret = attach_device(dev, domain); #ifdef CONFIG_IRQ_REMAP if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) { if (dom->type == IOMMU_DOMAIN_UNMANAGED) dev_data->use_vapic = 1; else dev_data->use_vapic = 0; } #endif iommu_completion_wait(iommu); return ret; } static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, phys_addr_t paddr, size_t page_size, int iommu_prot) { struct protection_domain *domain = to_pdomain(dom); int prot = 0; int ret; if (domain->mode == PAGE_MODE_NONE) return -EINVAL; if (iommu_prot & IOMMU_READ) prot |= IOMMU_PROT_IR; if (iommu_prot & IOMMU_WRITE) prot |= IOMMU_PROT_IW; mutex_lock(&domain->api_lock); ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL); mutex_unlock(&domain->api_lock); return ret; } static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova, size_t page_size) { struct protection_domain *domain = to_pdomain(dom); size_t unmap_size; if (domain->mode == PAGE_MODE_NONE) return 0; mutex_lock(&domain->api_lock); unmap_size = iommu_unmap_page(domain, iova, page_size); mutex_unlock(&domain->api_lock); return unmap_size; } static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, dma_addr_t iova) { struct protection_domain *domain = to_pdomain(dom); unsigned long offset_mask, pte_pgsize; u64 *pte, __pte; if (domain->mode == PAGE_MODE_NONE) return iova; pte = fetch_pte(domain, iova, &pte_pgsize); if (!pte || !IOMMU_PTE_PRESENT(*pte)) return 0; offset_mask = pte_pgsize - 1; __pte = __sme_clr(*pte & PM_ADDR_MASK); return (__pte & ~offset_mask) | (iova & offset_mask); } static bool amd_iommu_capable(enum iommu_cap cap) { switch (cap) { case IOMMU_CAP_CACHE_COHERENCY: return true; case IOMMU_CAP_INTR_REMAP: return (irq_remapping_enabled == 1); case IOMMU_CAP_NOEXEC: return false; default: break; } return false; } static void amd_iommu_get_resv_regions(struct device *dev, struct list_head *head) { struct iommu_resv_region *region; struct unity_map_entry *entry; int devid; devid = get_device_id(dev); if (devid < 0) return; list_for_each_entry(entry, &amd_iommu_unity_map, list) { int type, prot = 0; size_t length; if (devid < entry->devid_start || devid > entry->devid_end) continue; type = IOMMU_RESV_DIRECT; length = entry->address_end - entry->address_start; if (entry->prot & IOMMU_PROT_IR) prot |= IOMMU_READ; if (entry->prot & IOMMU_PROT_IW) prot |= IOMMU_WRITE; if (entry->prot & IOMMU_UNITY_MAP_FLAG_EXCL_RANGE) /* Exclusion range */ type = IOMMU_RESV_RESERVED; region = iommu_alloc_resv_region(entry->address_start, length, prot, type); if (!region) { dev_err(dev, "Out of memory allocating dm-regions\n"); return; } list_add_tail(®ion->list, head); } region = iommu_alloc_resv_region(MSI_RANGE_START, MSI_RANGE_END - MSI_RANGE_START + 1, 0, IOMMU_RESV_MSI); if (!region) return; list_add_tail(®ion->list, head); region = iommu_alloc_resv_region(HT_RANGE_START, HT_RANGE_END - HT_RANGE_START + 1, 0, IOMMU_RESV_RESERVED); if (!region) return; list_add_tail(®ion->list, head); } static void amd_iommu_put_resv_regions(struct device *dev, struct list_head *head) { struct iommu_resv_region *entry, *next; list_for_each_entry_safe(entry, next, head, list) kfree(entry); } static void amd_iommu_apply_resv_region(struct device *dev, struct iommu_domain *domain, struct iommu_resv_region *region) { struct dma_ops_domain *dma_dom = to_dma_ops_domain(to_pdomain(domain)); unsigned long start, end; start = IOVA_PFN(region->start); end = IOVA_PFN(region->start + region->length - 1); WARN_ON_ONCE(reserve_iova(&dma_dom->iovad, start, end) == NULL); } static bool amd_iommu_is_attach_deferred(struct iommu_domain *domain, struct device *dev) { struct iommu_dev_data *dev_data = dev->archdata.iommu; return dev_data->defer_attach; } static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain) { struct protection_domain *dom = to_pdomain(domain); domain_flush_tlb_pde(dom); domain_flush_complete(dom); } static void amd_iommu_iotlb_range_add(struct iommu_domain *domain, unsigned long iova, size_t size) { } const struct iommu_ops amd_iommu_ops = { .capable = amd_iommu_capable, .domain_alloc = amd_iommu_domain_alloc, .domain_free = amd_iommu_domain_free, .attach_dev = amd_iommu_attach_device, .detach_dev = amd_iommu_detach_device, .map = amd_iommu_map, .unmap = amd_iommu_unmap, .iova_to_phys = amd_iommu_iova_to_phys, .add_device = amd_iommu_add_device, .remove_device = amd_iommu_remove_device, .device_group = amd_iommu_device_group, .get_resv_regions = amd_iommu_get_resv_regions, .put_resv_regions = amd_iommu_put_resv_regions, .apply_resv_region = amd_iommu_apply_resv_region, .is_attach_deferred = amd_iommu_is_attach_deferred, .pgsize_bitmap = AMD_IOMMU_PGSIZES, .flush_iotlb_all = amd_iommu_flush_iotlb_all, .iotlb_range_add = amd_iommu_iotlb_range_add, .iotlb_sync = amd_iommu_flush_iotlb_all, }; /***************************************************************************** * * The next functions do a basic initialization of IOMMU for pass through * mode * * In passthrough mode the IOMMU is initialized and enabled but not used for * DMA-API translation. * *****************************************************************************/ /* IOMMUv2 specific functions */ int amd_iommu_register_ppr_notifier(struct notifier_block *nb) { return atomic_notifier_chain_register(&ppr_notifier, nb); } EXPORT_SYMBOL(amd_iommu_register_ppr_notifier); int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb) { return atomic_notifier_chain_unregister(&ppr_notifier, nb); } EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier); void amd_iommu_domain_direct_map(struct iommu_domain *dom) { struct protection_domain *domain = to_pdomain(dom); unsigned long flags; spin_lock_irqsave(&domain->lock, flags); /* Update data structure */ domain->mode = PAGE_MODE_NONE; domain->updated = true; /* Make changes visible to IOMMUs */ update_domain(domain); /* Page-table is not visible to IOMMU anymore, so free it */ free_pagetable(domain); spin_unlock_irqrestore(&domain->lock, flags); } EXPORT_SYMBOL(amd_iommu_domain_direct_map); int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids) { struct protection_domain *domain = to_pdomain(dom); unsigned long flags; int levels, ret; if (pasids <= 0 || pasids > (PASID_MASK + 1)) return -EINVAL; /* Number of GCR3 table levels required */ for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9) levels += 1; if (levels > amd_iommu_max_glx_val) return -EINVAL; spin_lock_irqsave(&domain->lock, flags); /* * Save us all sanity checks whether devices already in the * domain support IOMMUv2. Just force that the domain has no * devices attached when it is switched into IOMMUv2 mode. */ ret = -EBUSY; if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK) goto out; ret = -ENOMEM; domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC); if (domain->gcr3_tbl == NULL) goto out; domain->glx = levels; domain->flags |= PD_IOMMUV2_MASK; domain->updated = true; update_domain(domain); ret = 0; out: spin_unlock_irqrestore(&domain->lock, flags); return ret; } EXPORT_SYMBOL(amd_iommu_domain_enable_v2); static int __flush_pasid(struct protection_domain *domain, int pasid, u64 address, bool size) { struct iommu_dev_data *dev_data; struct iommu_cmd cmd; int i, ret; if (!(domain->flags & PD_IOMMUV2_MASK)) return -EINVAL; build_inv_iommu_pasid(&cmd, domain->id, pasid, address, size); /* * IOMMU TLB needs to be flushed before Device TLB to * prevent device TLB refill from IOMMU TLB */ for (i = 0; i < amd_iommu_get_num_iommus(); ++i) { if (domain->dev_iommu[i] == 0) continue; ret = iommu_queue_command(amd_iommus[i], &cmd); if (ret != 0) goto out; } /* Wait until IOMMU TLB flushes are complete */ domain_flush_complete(domain); /* Now flush device TLBs */ list_for_each_entry(dev_data, &domain->dev_list, list) { struct amd_iommu *iommu; int qdep; /* There might be non-IOMMUv2 capable devices in an IOMMUv2 * domain. */ if (!dev_data->ats.enabled) continue; qdep = dev_data->ats.qdep; iommu = amd_iommu_rlookup_table[dev_data->devid]; build_inv_iotlb_pasid(&cmd, dev_data->devid, pasid, qdep, address, size); ret = iommu_queue_command(iommu, &cmd); if (ret != 0) goto out; } /* Wait until all device TLBs are flushed */ domain_flush_complete(domain); ret = 0; out: return ret; } static int __amd_iommu_flush_page(struct protection_domain *domain, int pasid, u64 address) { return __flush_pasid(domain, pasid, address, false); } int amd_iommu_flush_page(struct iommu_domain *dom, int pasid, u64 address) { struct protection_domain *domain = to_pdomain(dom); unsigned long flags; int ret; spin_lock_irqsave(&domain->lock, flags); ret = __amd_iommu_flush_page(domain, pasid, address); spin_unlock_irqrestore(&domain->lock, flags); return ret; } EXPORT_SYMBOL(amd_iommu_flush_page); static int __amd_iommu_flush_tlb(struct protection_domain *domain, int pasid) { return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, true); } int amd_iommu_flush_tlb(struct iommu_domain *dom, int pasid) { struct protection_domain *domain = to_pdomain(dom); unsigned long flags; int ret; spin_lock_irqsave(&domain->lock, flags); ret = __amd_iommu_flush_tlb(domain, pasid); spin_unlock_irqrestore(&domain->lock, flags); return ret; } EXPORT_SYMBOL(amd_iommu_flush_tlb); static u64 *__get_gcr3_pte(u64 *root, int level, int pasid, bool alloc) { int index; u64 *pte; while (true) { index = (pasid >> (9 * level)) & 0x1ff; pte = &root[index]; if (level == 0) break; if (!(*pte & GCR3_VALID)) { if (!alloc) return NULL; root = (void *)get_zeroed_page(GFP_ATOMIC); if (root == NULL) return NULL; *pte = iommu_virt_to_phys(root) | GCR3_VALID; } root = iommu_phys_to_virt(*pte & PAGE_MASK); level -= 1; } return pte; } static int __set_gcr3(struct protection_domain *domain, int pasid, unsigned long cr3) { u64 *pte; if (domain->mode != PAGE_MODE_NONE) return -EINVAL; pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true); if (pte == NULL) return -ENOMEM; *pte = (cr3 & PAGE_MASK) | GCR3_VALID; return __amd_iommu_flush_tlb(domain, pasid); } static int __clear_gcr3(struct protection_domain *domain, int pasid) { u64 *pte; if (domain->mode != PAGE_MODE_NONE) return -EINVAL; pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false); if (pte == NULL) return 0; *pte = 0; return __amd_iommu_flush_tlb(domain, pasid); } int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid, unsigned long cr3) { struct protection_domain *domain = to_pdomain(dom); unsigned long flags; int ret; spin_lock_irqsave(&domain->lock, flags); ret = __set_gcr3(domain, pasid, cr3); spin_unlock_irqrestore(&domain->lock, flags); return ret; } EXPORT_SYMBOL(amd_iommu_domain_set_gcr3); int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid) { struct protection_domain *domain = to_pdomain(dom); unsigned long flags; int ret; spin_lock_irqsave(&domain->lock, flags); ret = __clear_gcr3(domain, pasid); spin_unlock_irqrestore(&domain->lock, flags); return ret; } EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3); int amd_iommu_complete_ppr(struct pci_dev *pdev, int pasid, int status, int tag) { struct iommu_dev_data *dev_data; struct amd_iommu *iommu; struct iommu_cmd cmd; dev_data = get_dev_data(&pdev->dev); iommu = amd_iommu_rlookup_table[dev_data->devid]; build_complete_ppr(&cmd, dev_data->devid, pasid, status, tag, dev_data->pri_tlp); return iommu_queue_command(iommu, &cmd); } EXPORT_SYMBOL(amd_iommu_complete_ppr); struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev) { struct protection_domain *pdomain; pdomain = get_domain(&pdev->dev); if (IS_ERR(pdomain)) return NULL; /* Only return IOMMUv2 domains */ if (!(pdomain->flags & PD_IOMMUV2_MASK)) return NULL; return &pdomain->domain; } EXPORT_SYMBOL(amd_iommu_get_v2_domain); void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum) { struct iommu_dev_data *dev_data; if (!amd_iommu_v2_supported()) return; dev_data = get_dev_data(&pdev->dev); dev_data->errata |= (1 << erratum); } EXPORT_SYMBOL(amd_iommu_enable_device_erratum); int amd_iommu_device_info(struct pci_dev *pdev, struct amd_iommu_device_info *info) { int max_pasids; int pos; if (pdev == NULL || info == NULL) return -EINVAL; if (!amd_iommu_v2_supported()) return -EINVAL; memset(info, 0, sizeof(*info)); if (!pci_ats_disabled()) { pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS); if (pos) info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP; } pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); if (pos) info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP; pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); if (pos) { int features; max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1)); max_pasids = min(max_pasids, (1 << 20)); info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP; info->max_pasids = min(pci_max_pasids(pdev), max_pasids); features = pci_pasid_features(pdev); if (features & PCI_PASID_CAP_EXEC) info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP; if (features & PCI_PASID_CAP_PRIV) info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP; } return 0; } EXPORT_SYMBOL(amd_iommu_device_info); #ifdef CONFIG_IRQ_REMAP /***************************************************************************** * * Interrupt Remapping Implementation * *****************************************************************************/ static struct irq_chip amd_ir_chip; static DEFINE_SPINLOCK(iommu_table_lock); static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table) { u64 dte; dte = amd_iommu_dev_table[devid].data[2]; dte &= ~DTE_IRQ_PHYS_ADDR_MASK; dte |= iommu_virt_to_phys(table->table); dte |= DTE_IRQ_REMAP_INTCTL; dte |= DTE_IRQ_TABLE_LEN; dte |= DTE_IRQ_REMAP_ENABLE; amd_iommu_dev_table[devid].data[2] = dte; } static struct irq_remap_table *get_irq_table(u16 devid) { struct irq_remap_table *table; if (WARN_ONCE(!amd_iommu_rlookup_table[devid], "%s: no iommu for devid %x\n", __func__, devid)) return NULL; table = irq_lookup_table[devid]; if (WARN_ONCE(!table, "%s: no table for devid %x\n", __func__, devid)) return NULL; return table; } static struct irq_remap_table *__alloc_irq_table(void) { struct irq_remap_table *table; table = kzalloc(sizeof(*table), GFP_KERNEL); if (!table) return NULL; table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_KERNEL); if (!table->table) { kfree(table); return NULL; } raw_spin_lock_init(&table->lock); if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir)) memset(table->table, 0, MAX_IRQS_PER_TABLE * sizeof(u32)); else memset(table->table, 0, (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2))); return table; } static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid, struct irq_remap_table *table) { irq_lookup_table[devid] = table; set_dte_irq_entry(devid, table); iommu_flush_dte(iommu, devid); } static struct irq_remap_table *alloc_irq_table(u16 devid) { struct irq_remap_table *table = NULL; struct irq_remap_table *new_table = NULL; struct amd_iommu *iommu; unsigned long flags; u16 alias; spin_lock_irqsave(&iommu_table_lock, flags); iommu = amd_iommu_rlookup_table[devid]; if (!iommu) goto out_unlock; table = irq_lookup_table[devid]; if (table) goto out_unlock; alias = amd_iommu_alias_table[devid]; table = irq_lookup_table[alias]; if (table) { set_remap_table_entry(iommu, devid, table); goto out_wait; } spin_unlock_irqrestore(&iommu_table_lock, flags); /* Nothing there yet, allocate new irq remapping table */ new_table = __alloc_irq_table(); if (!new_table) return NULL; spin_lock_irqsave(&iommu_table_lock, flags); table = irq_lookup_table[devid]; if (table) goto out_unlock; table = irq_lookup_table[alias]; if (table) { set_remap_table_entry(iommu, devid, table); goto out_wait; } table = new_table; new_table = NULL; set_remap_table_entry(iommu, devid, table); if (devid != alias) set_remap_table_entry(iommu, alias, table); out_wait: iommu_completion_wait(iommu); out_unlock: spin_unlock_irqrestore(&iommu_table_lock, flags); if (new_table) { kmem_cache_free(amd_iommu_irq_cache, new_table->table); kfree(new_table); } return table; } static int alloc_irq_index(u16 devid, int count, bool align) { struct irq_remap_table *table; int index, c, alignment = 1; unsigned long flags; struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return -ENODEV; table = alloc_irq_table(devid); if (!table) return -ENODEV; if (align) alignment = roundup_pow_of_two(count); raw_spin_lock_irqsave(&table->lock, flags); /* Scan table for free entries */ for (index = ALIGN(table->min_index, alignment), c = 0; index < MAX_IRQS_PER_TABLE;) { if (!iommu->irte_ops->is_allocated(table, index)) { c += 1; } else { c = 0; index = ALIGN(index + 1, alignment); continue; } if (c == count) { for (; c != 0; --c) iommu->irte_ops->set_allocated(table, index - c + 1); index -= count - 1; goto out; } index++; } index = -ENOSPC; out: raw_spin_unlock_irqrestore(&table->lock, flags); return index; } static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte, struct amd_ir_data *data) { struct irq_remap_table *table; struct amd_iommu *iommu; unsigned long flags; struct irte_ga *entry; iommu = amd_iommu_rlookup_table[devid]; if (iommu == NULL) return -EINVAL; table = get_irq_table(devid); if (!table) return -ENOMEM; raw_spin_lock_irqsave(&table->lock, flags); entry = (struct irte_ga *)table->table; entry = &entry[index]; entry->lo.fields_remap.valid = 0; entry->hi.val = irte->hi.val; entry->lo.val = irte->lo.val; entry->lo.fields_remap.valid = 1; if (data) data->ref = entry; raw_spin_unlock_irqrestore(&table->lock, flags); iommu_flush_irt(iommu, devid); iommu_completion_wait(iommu); return 0; } static int modify_irte(u16 devid, int index, union irte *irte) { struct irq_remap_table *table; struct amd_iommu *iommu; unsigned long flags; iommu = amd_iommu_rlookup_table[devid]; if (iommu == NULL) return -EINVAL; table = get_irq_table(devid); if (!table) return -ENOMEM; raw_spin_lock_irqsave(&table->lock, flags); table->table[index] = irte->val; raw_spin_unlock_irqrestore(&table->lock, flags); iommu_flush_irt(iommu, devid); iommu_completion_wait(iommu); return 0; } static void free_irte(u16 devid, int index) { struct irq_remap_table *table; struct amd_iommu *iommu; unsigned long flags; iommu = amd_iommu_rlookup_table[devid]; if (iommu == NULL) return; table = get_irq_table(devid); if (!table) return; raw_spin_lock_irqsave(&table->lock, flags); iommu->irte_ops->clear_allocated(table, index); raw_spin_unlock_irqrestore(&table->lock, flags); iommu_flush_irt(iommu, devid); iommu_completion_wait(iommu); } static void irte_prepare(void *entry, u32 delivery_mode, u32 dest_mode, u8 vector, u32 dest_apicid, int devid) { union irte *irte = (union irte *) entry; irte->val = 0; irte->fields.vector = vector; irte->fields.int_type = delivery_mode; irte->fields.destination = dest_apicid; irte->fields.dm = dest_mode; irte->fields.valid = 1; } static void irte_ga_prepare(void *entry, u32 delivery_mode, u32 dest_mode, u8 vector, u32 dest_apicid, int devid) { struct irte_ga *irte = (struct irte_ga *) entry; irte->lo.val = 0; irte->hi.val = 0; irte->lo.fields_remap.int_type = delivery_mode; irte->lo.fields_remap.dm = dest_mode; irte->hi.fields.vector = vector; irte->lo.fields_remap.destination = APICID_TO_IRTE_DEST_LO(dest_apicid); irte->hi.fields.destination = APICID_TO_IRTE_DEST_HI(dest_apicid); irte->lo.fields_remap.valid = 1; } static void irte_activate(void *entry, u16 devid, u16 index) { union irte *irte = (union irte *) entry; irte->fields.valid = 1; modify_irte(devid, index, irte); } static void irte_ga_activate(void *entry, u16 devid, u16 index) { struct irte_ga *irte = (struct irte_ga *) entry; irte->lo.fields_remap.valid = 1; modify_irte_ga(devid, index, irte, NULL); } static void irte_deactivate(void *entry, u16 devid, u16 index) { union irte *irte = (union irte *) entry; irte->fields.valid = 0; modify_irte(devid, index, irte); } static void irte_ga_deactivate(void *entry, u16 devid, u16 index) { struct irte_ga *irte = (struct irte_ga *) entry; irte->lo.fields_remap.valid = 0; modify_irte_ga(devid, index, irte, NULL); } static void irte_set_affinity(void *entry, u16 devid, u16 index, u8 vector, u32 dest_apicid) { union irte *irte = (union irte *) entry; irte->fields.vector = vector; irte->fields.destination = dest_apicid; modify_irte(devid, index, irte); } static void irte_ga_set_affinity(void *entry, u16 devid, u16 index, u8 vector, u32 dest_apicid) { struct irte_ga *irte = (struct irte_ga *) entry; if (!irte->lo.fields_remap.guest_mode) { irte->hi.fields.vector = vector; irte->lo.fields_remap.destination = APICID_TO_IRTE_DEST_LO(dest_apicid); irte->hi.fields.destination = APICID_TO_IRTE_DEST_HI(dest_apicid); modify_irte_ga(devid, index, irte, NULL); } } #define IRTE_ALLOCATED (~1U) static void irte_set_allocated(struct irq_remap_table *table, int index) { table->table[index] = IRTE_ALLOCATED; } static void irte_ga_set_allocated(struct irq_remap_table *table, int index) { struct irte_ga *ptr = (struct irte_ga *)table->table; struct irte_ga *irte = &ptr[index]; memset(&irte->lo.val, 0, sizeof(u64)); memset(&irte->hi.val, 0, sizeof(u64)); irte->hi.fields.vector = 0xff; } static bool irte_is_allocated(struct irq_remap_table *table, int index) { union irte *ptr = (union irte *)table->table; union irte *irte = &ptr[index]; return irte->val != 0; } static bool irte_ga_is_allocated(struct irq_remap_table *table, int index) { struct irte_ga *ptr = (struct irte_ga *)table->table; struct irte_ga *irte = &ptr[index]; return irte->hi.fields.vector != 0; } static void irte_clear_allocated(struct irq_remap_table *table, int index) { table->table[index] = 0; } static void irte_ga_clear_allocated(struct irq_remap_table *table, int index) { struct irte_ga *ptr = (struct irte_ga *)table->table; struct irte_ga *irte = &ptr[index]; memset(&irte->lo.val, 0, sizeof(u64)); memset(&irte->hi.val, 0, sizeof(u64)); } static int get_devid(struct irq_alloc_info *info) { int devid = -1; switch (info->type) { case X86_IRQ_ALLOC_TYPE_IOAPIC: devid = get_ioapic_devid(info->ioapic_id); break; case X86_IRQ_ALLOC_TYPE_HPET: devid = get_hpet_devid(info->hpet_id); break; case X86_IRQ_ALLOC_TYPE_MSI: case X86_IRQ_ALLOC_TYPE_MSIX: devid = get_device_id(&info->msi_dev->dev); break; default: BUG_ON(1); break; } return devid; } static struct irq_domain *get_ir_irq_domain(struct irq_alloc_info *info) { struct amd_iommu *iommu; int devid; if (!info) return NULL; devid = get_devid(info); if (devid >= 0) { iommu = amd_iommu_rlookup_table[devid]; if (iommu) return iommu->ir_domain; } return NULL; } static struct irq_domain *get_irq_domain(struct irq_alloc_info *info) { struct amd_iommu *iommu; int devid; if (!info) return NULL; switch (info->type) { case X86_IRQ_ALLOC_TYPE_MSI: case X86_IRQ_ALLOC_TYPE_MSIX: devid = get_device_id(&info->msi_dev->dev); if (devid < 0) return NULL; iommu = amd_iommu_rlookup_table[devid]; if (iommu) return iommu->msi_domain; break; default: break; } return NULL; } struct irq_remap_ops amd_iommu_irq_ops = { .prepare = amd_iommu_prepare, .enable = amd_iommu_enable, .disable = amd_iommu_disable, .reenable = amd_iommu_reenable, .enable_faulting = amd_iommu_enable_faulting, .get_ir_irq_domain = get_ir_irq_domain, .get_irq_domain = get_irq_domain, }; static void irq_remapping_prepare_irte(struct amd_ir_data *data, struct irq_cfg *irq_cfg, struct irq_alloc_info *info, int devid, int index, int sub_handle) { struct irq_2_irte *irte_info = &data->irq_2_irte; struct msi_msg *msg = &data->msi_entry; struct IO_APIC_route_entry *entry; struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return; data->irq_2_irte.devid = devid; data->irq_2_irte.index = index + sub_handle; iommu->irte_ops->prepare(data->entry, apic->irq_delivery_mode, apic->irq_dest_mode, irq_cfg->vector, irq_cfg->dest_apicid, devid); switch (info->type) { case X86_IRQ_ALLOC_TYPE_IOAPIC: /* Setup IOAPIC entry */ entry = info->ioapic_entry; info->ioapic_entry = NULL; memset(entry, 0, sizeof(*entry)); entry->vector = index; entry->mask = 0; entry->trigger = info->ioapic_trigger; entry->polarity = info->ioapic_polarity; /* Mask level triggered irqs. */ if (info->ioapic_trigger) entry->mask = 1; break; case X86_IRQ_ALLOC_TYPE_HPET: case X86_IRQ_ALLOC_TYPE_MSI: case X86_IRQ_ALLOC_TYPE_MSIX: msg->address_hi = MSI_ADDR_BASE_HI; msg->address_lo = MSI_ADDR_BASE_LO; msg->data = irte_info->index; break; default: BUG_ON(1); break; } } struct amd_irte_ops irte_32_ops = { .prepare = irte_prepare, .activate = irte_activate, .deactivate = irte_deactivate, .set_affinity = irte_set_affinity, .set_allocated = irte_set_allocated, .is_allocated = irte_is_allocated, .clear_allocated = irte_clear_allocated, }; struct amd_irte_ops irte_128_ops = { .prepare = irte_ga_prepare, .activate = irte_ga_activate, .deactivate = irte_ga_deactivate, .set_affinity = irte_ga_set_affinity, .set_allocated = irte_ga_set_allocated, .is_allocated = irte_ga_is_allocated, .clear_allocated = irte_ga_clear_allocated, }; static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *arg) { struct irq_alloc_info *info = arg; struct irq_data *irq_data; struct amd_ir_data *data = NULL; struct irq_cfg *cfg; int i, ret, devid; int index; if (!info) return -EINVAL; if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_MSI && info->type != X86_IRQ_ALLOC_TYPE_MSIX) return -EINVAL; /* * With IRQ remapping enabled, don't need contiguous CPU vectors * to support multiple MSI interrupts. */ if (info->type == X86_IRQ_ALLOC_TYPE_MSI) info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS; devid = get_devid(info); if (devid < 0) return -EINVAL; ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); if (ret < 0) return ret; if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) { struct irq_remap_table *table; struct amd_iommu *iommu; table = alloc_irq_table(devid); if (table) { if (!table->min_index) { /* * Keep the first 32 indexes free for IOAPIC * interrupts. */ table->min_index = 32; iommu = amd_iommu_rlookup_table[devid]; for (i = 0; i < 32; ++i) iommu->irte_ops->set_allocated(table, i); } WARN_ON(table->min_index != 32); index = info->ioapic_pin; } else { index = -ENOMEM; } } else { bool align = (info->type == X86_IRQ_ALLOC_TYPE_MSI); index = alloc_irq_index(devid, nr_irqs, align); } if (index < 0) { pr_warn("Failed to allocate IRTE\n"); ret = index; goto out_free_parent; } for (i = 0; i < nr_irqs; i++) { irq_data = irq_domain_get_irq_data(domain, virq + i); cfg = irqd_cfg(irq_data); if (!irq_data || !cfg) { ret = -EINVAL; goto out_free_data; } ret = -ENOMEM; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) goto out_free_data; if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir)) data->entry = kzalloc(sizeof(union irte), GFP_KERNEL); else data->entry = kzalloc(sizeof(struct irte_ga), GFP_KERNEL); if (!data->entry) { kfree(data); goto out_free_data; } irq_data->hwirq = (devid << 16) + i; irq_data->chip_data = data; irq_data->chip = &amd_ir_chip; irq_remapping_prepare_irte(data, cfg, info, devid, index, i); irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT); } return 0; out_free_data: for (i--; i >= 0; i--) { irq_data = irq_domain_get_irq_data(domain, virq + i); if (irq_data) kfree(irq_data->chip_data); } for (i = 0; i < nr_irqs; i++) free_irte(devid, index + i); out_free_parent: irq_domain_free_irqs_common(domain, virq, nr_irqs); return ret; } static void irq_remapping_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct irq_2_irte *irte_info; struct irq_data *irq_data; struct amd_ir_data *data; int i; for (i = 0; i < nr_irqs; i++) { irq_data = irq_domain_get_irq_data(domain, virq + i); if (irq_data && irq_data->chip_data) { data = irq_data->chip_data; irte_info = &data->irq_2_irte; free_irte(irte_info->devid, irte_info->index); kfree(data->entry); kfree(data); } } irq_domain_free_irqs_common(domain, virq, nr_irqs); } static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu, struct amd_ir_data *ir_data, struct irq_2_irte *irte_info, struct irq_cfg *cfg); static int irq_remapping_activate(struct irq_domain *domain, struct irq_data *irq_data, bool reserve) { struct amd_ir_data *data = irq_data->chip_data; struct irq_2_irte *irte_info = &data->irq_2_irte; struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid]; struct irq_cfg *cfg = irqd_cfg(irq_data); if (!iommu) return 0; iommu->irte_ops->activate(data->entry, irte_info->devid, irte_info->index); amd_ir_update_irte(irq_data, iommu, data, irte_info, cfg); return 0; } static void irq_remapping_deactivate(struct irq_domain *domain, struct irq_data *irq_data) { struct amd_ir_data *data = irq_data->chip_data; struct irq_2_irte *irte_info = &data->irq_2_irte; struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid]; if (iommu) iommu->irte_ops->deactivate(data->entry, irte_info->devid, irte_info->index); } static const struct irq_domain_ops amd_ir_domain_ops = { .alloc = irq_remapping_alloc, .free = irq_remapping_free, .activate = irq_remapping_activate, .deactivate = irq_remapping_deactivate, }; static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info) { struct amd_iommu *iommu; struct amd_iommu_pi_data *pi_data = vcpu_info; struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data; struct amd_ir_data *ir_data = data->chip_data; struct irte_ga *irte = (struct irte_ga *) ir_data->entry; struct irq_2_irte *irte_info = &ir_data->irq_2_irte; struct iommu_dev_data *dev_data = search_dev_data(irte_info->devid); /* Note: * This device has never been set up for guest mode. * we should not modify the IRTE */ if (!dev_data || !dev_data->use_vapic) return 0; pi_data->ir_data = ir_data; /* Note: * SVM tries to set up for VAPIC mode, but we are in * legacy mode. So, we force legacy mode instead. */ if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) { pr_debug("%s: Fall back to using intr legacy remap\n", __func__); pi_data->is_guest_mode = false; } iommu = amd_iommu_rlookup_table[irte_info->devid]; if (iommu == NULL) return -EINVAL; pi_data->prev_ga_tag = ir_data->cached_ga_tag; if (pi_data->is_guest_mode) { /* Setting */ irte->hi.fields.ga_root_ptr = (pi_data->base >> 12); irte->hi.fields.vector = vcpu_pi_info->vector; irte->lo.fields_vapic.ga_log_intr = 1; irte->lo.fields_vapic.guest_mode = 1; irte->lo.fields_vapic.ga_tag = pi_data->ga_tag; ir_data->cached_ga_tag = pi_data->ga_tag; } else { /* Un-Setting */ struct irq_cfg *cfg = irqd_cfg(data); irte->hi.val = 0; irte->lo.val = 0; irte->hi.fields.vector = cfg->vector; irte->lo.fields_remap.guest_mode = 0; irte->lo.fields_remap.destination = APICID_TO_IRTE_DEST_LO(cfg->dest_apicid); irte->hi.fields.destination = APICID_TO_IRTE_DEST_HI(cfg->dest_apicid); irte->lo.fields_remap.int_type = apic->irq_delivery_mode; irte->lo.fields_remap.dm = apic->irq_dest_mode; /* * This communicates the ga_tag back to the caller * so that it can do all the necessary clean up. */ ir_data->cached_ga_tag = 0; } return modify_irte_ga(irte_info->devid, irte_info->index, irte, ir_data); } static void amd_ir_update_irte(struct irq_data *irqd, struct amd_iommu *iommu, struct amd_ir_data *ir_data, struct irq_2_irte *irte_info, struct irq_cfg *cfg) { /* * Atomically updates the IRTE with the new destination, vector * and flushes the interrupt entry cache. */ iommu->irte_ops->set_affinity(ir_data->entry, irte_info->devid, irte_info->index, cfg->vector, cfg->dest_apicid); } static int amd_ir_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) { struct amd_ir_data *ir_data = data->chip_data; struct irq_2_irte *irte_info = &ir_data->irq_2_irte; struct irq_cfg *cfg = irqd_cfg(data); struct irq_data *parent = data->parent_data; struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid]; int ret; if (!iommu) return -ENODEV; ret = parent->chip->irq_set_affinity(parent, mask, force); if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE) return ret; amd_ir_update_irte(data, iommu, ir_data, irte_info, cfg); /* * After this point, all the interrupts will start arriving * at the new destination. So, time to cleanup the previous * vector allocation. */ send_cleanup_vector(cfg); return IRQ_SET_MASK_OK_DONE; } static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg) { struct amd_ir_data *ir_data = irq_data->chip_data; *msg = ir_data->msi_entry; } static struct irq_chip amd_ir_chip = { .name = "AMD-IR", .irq_ack = apic_ack_irq, .irq_set_affinity = amd_ir_set_affinity, .irq_set_vcpu_affinity = amd_ir_set_vcpu_affinity, .irq_compose_msi_msg = ir_compose_msi_msg, }; int amd_iommu_create_irq_domain(struct amd_iommu *iommu) { struct fwnode_handle *fn; fn = irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index); if (!fn) return -ENOMEM; iommu->ir_domain = irq_domain_create_tree(fn, &amd_ir_domain_ops, iommu); irq_domain_free_fwnode(fn); if (!iommu->ir_domain) return -ENOMEM; iommu->ir_domain->parent = arch_get_ir_parent_domain(); iommu->msi_domain = arch_create_remap_msi_irq_domain(iommu->ir_domain, "AMD-IR-MSI", iommu->index); return 0; } int amd_iommu_update_ga(int cpu, bool is_run, void *data) { unsigned long flags; struct amd_iommu *iommu; struct irq_remap_table *table; struct amd_ir_data *ir_data = (struct amd_ir_data *)data; int devid = ir_data->irq_2_irte.devid; struct irte_ga *entry = (struct irte_ga *) ir_data->entry; struct irte_ga *ref = (struct irte_ga *) ir_data->ref; if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) || !ref || !entry || !entry->lo.fields_vapic.guest_mode) return 0; iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return -ENODEV; table = get_irq_table(devid); if (!table) return -ENODEV; raw_spin_lock_irqsave(&table->lock, flags); if (ref->lo.fields_vapic.guest_mode) { if (cpu >= 0) { ref->lo.fields_vapic.destination = APICID_TO_IRTE_DEST_LO(cpu); ref->hi.fields.destination = APICID_TO_IRTE_DEST_HI(cpu); } ref->lo.fields_vapic.is_run = is_run; barrier(); } raw_spin_unlock_irqrestore(&table->lock, flags); iommu_flush_irt(iommu, devid); iommu_completion_wait(iommu); return 0; } EXPORT_SYMBOL(amd_iommu_update_ga); #endif
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