| // 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/dma-iommu.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(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; |
| |
| /* |
| * 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 update_and_flush_device_table(struct protection_domain *domain, |
| struct domain_pgtable *pgtable); |
| |
| /**************************************************************************** |
| * |
| * Helper functions |
| * |
| ****************************************************************************/ |
| |
| 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 acpi_device *adev = ACPI_COMPANION(dev); |
| struct acpihid_map_entry *p; |
| |
| if (!adev) |
| return -ENODEV; |
| |
| list_for_each_entry(p, &acpihid_map, list) { |
| if (acpi_dev_hid_uid_match(adev, p->hid, |
| p->uid[0] ? p->uid : NULL)) { |
| 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 void amd_iommu_domain_get_pgtable(struct protection_domain *domain, |
| struct domain_pgtable *pgtable) |
| { |
| u64 pt_root = atomic64_read(&domain->pt_root); |
| |
| pgtable->root = (u64 *)(pt_root & PAGE_MASK); |
| pgtable->mode = pt_root & 7; /* lowest 3 bits encode pgtable mode */ |
| } |
| |
| static u64 amd_iommu_domain_encode_pgtable(u64 *root, int mode) |
| { |
| u64 pt_root; |
| |
| /* lowest 3 bits encode pgtable mode */ |
| pt_root = mode & 7; |
| pt_root |= (u64)root; |
| |
| return pt_root; |
| } |
| |
| 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; |
| |
| spin_lock_init(&dev_data->lock); |
| 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 clone_alias(struct pci_dev *pdev, u16 alias, void *data) |
| { |
| u16 devid = pci_dev_id(pdev); |
| |
| if (devid == alias) |
| return 0; |
| |
| amd_iommu_rlookup_table[alias] = |
| amd_iommu_rlookup_table[devid]; |
| memcpy(amd_iommu_dev_table[alias].data, |
| amd_iommu_dev_table[devid].data, |
| sizeof(amd_iommu_dev_table[alias].data)); |
| |
| return 0; |
| } |
| |
| static void clone_aliases(struct pci_dev *pdev) |
| { |
| if (!pdev) |
| return; |
| |
| /* |
| * The IVRS alias stored in the alias table may not be |
| * part of the PCI DMA aliases if it's bus differs |
| * from the original device. |
| */ |
| clone_alias(pdev, amd_iommu_alias_table[pci_dev_id(pdev)], NULL); |
| |
| pci_for_each_dma_alias(pdev, clone_alias, NULL); |
| } |
| |
| static struct pci_dev *setup_aliases(struct device *dev) |
| { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| u16 ivrs_alias; |
| |
| /* For ACPI HID devices, there are no aliases */ |
| if (!dev_is_pci(dev)) |
| return NULL; |
| |
| /* |
| * Add the IVRS alias to the pci aliases if it is on the same |
| * bus. The IVRS table may know about a quirk that we don't. |
| */ |
| ivrs_alias = amd_iommu_alias_table[pci_dev_id(pdev)]; |
| if (ivrs_alias != pci_dev_id(pdev) && |
| PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) |
| pci_add_dma_alias(pdev, ivrs_alias & 0xff, 1); |
| |
| clone_aliases(pdev); |
| |
| return pdev; |
| } |
| |
| 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->pdev = setup_aliases(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_default_passthrough() || !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) |
| { |
| int devid; |
| |
| devid = get_device_id(dev); |
| if (devid < 0) |
| return; |
| |
| amd_iommu_rlookup_table[devid] = NULL; |
| memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry)); |
| |
| setup_aliases(dev); |
| } |
| |
| 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. |
| */ |
| } |
| |
| /* |
| * Helper function to get the first pte of a large mapping |
| */ |
| static u64 *first_pte_l7(u64 *pte, unsigned long *page_size, |
| unsigned long *count) |
| { |
| unsigned long pte_mask, pg_size, cnt; |
| u64 *fpte; |
| |
| pg_size = PTE_PAGE_SIZE(*pte); |
| cnt = PAGE_SIZE_PTE_COUNT(pg_size); |
| pte_mask = ~((cnt << 3) - 1); |
| fpte = (u64 *)(((unsigned long)pte) & pte_mask); |
| |
| if (page_size) |
| *page_size = pg_size; |
| |
| if (count) |
| *count = cnt; |
| |
| return fpte; |
| } |
| |
| /**************************************************************************** |
| * |
| * 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 = (event[0] & EVENT_DOMID_MASK_HI) | |
| (event[1] & EVENT_DOMID_MASK_LO); |
| 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 pasid=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 = PPR_PASID(*((u64 *)__evt)); |
| 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 tag=0x%03x]\n", |
| PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| pasid, address, flags, tag); |
| 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; |
| u32 tail; |
| |
| /* Copy command to buffer */ |
| tail = iommu->cmd_buf_tail; |
| target = iommu->cmd_buf + tail; |
| memcpy(target, cmd, sizeof(*cmd)); |
| |
| tail = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE; |
| iommu->cmd_buf_tail = tail; |
| |
| /* Tell the IOMMU about it */ |
| writel(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_tlb_domid(struct amd_iommu *iommu, u32 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); |
| } |
| |
| static int device_flush_dte_alias(struct pci_dev *pdev, u16 alias, void *data) |
| { |
| struct amd_iommu *iommu = data; |
| |
| return iommu_flush_dte(iommu, alias); |
| } |
| |
| /* |
| * 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]; |
| |
| if (dev_data->pdev) |
| ret = pci_for_each_dma_alias(dev_data->pdev, |
| device_flush_dte_alias, iommu); |
| else |
| ret = iommu_flush_dte(iommu, dev_data->devid); |
| if (ret) |
| return ret; |
| |
| alias = amd_iommu_alias_table[dev_data->devid]; |
| if (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 - 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]); |
| } |
| } |
| |
| /* Flush the not present cache if it exists */ |
| static void domain_flush_np_cache(struct protection_domain *domain, |
| dma_addr_t iova, size_t size) |
| { |
| if (unlikely(amd_iommu_np_cache)) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| domain_flush_pages(domain, iova, size); |
| domain_flush_complete(domain); |
| spin_unlock_irqrestore(&domain->lock, flags); |
| } |
| } |
| |
| |
| /* |
| * 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) |
| { |
| struct domain_pgtable pgtable; |
| struct page *freelist = NULL; |
| unsigned long root; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| atomic64_set(&domain->pt_root, 0); |
| |
| BUG_ON(pgtable.mode < PAGE_MODE_NONE || |
| pgtable.mode > PAGE_MODE_6_LEVEL); |
| |
| root = (unsigned long)pgtable.root; |
| freelist = free_sub_pt(root, pgtable.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, |
| unsigned long address, |
| gfp_t gfp) |
| { |
| struct domain_pgtable pgtable; |
| unsigned long flags; |
| bool ret = true; |
| u64 *pte, root; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| |
| if (address <= PM_LEVEL_SIZE(pgtable.mode)) |
| goto out; |
| |
| ret = false; |
| if (WARN_ON_ONCE(pgtable.mode == PAGE_MODE_6_LEVEL)) |
| goto out; |
| |
| pte = (void *)get_zeroed_page(gfp); |
| if (!pte) |
| goto out; |
| |
| *pte = PM_LEVEL_PDE(pgtable.mode, iommu_virt_to_phys(pgtable.root)); |
| |
| pgtable.root = pte; |
| pgtable.mode += 1; |
| update_and_flush_device_table(domain, &pgtable); |
| domain_flush_complete(domain); |
| |
| /* |
| * Device Table needs to be updated and flushed before the new root can |
| * be published. |
| */ |
| root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode); |
| atomic64_set(&domain->pt_root, root); |
| |
| ret = true; |
| |
| out: |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| return ret; |
| } |
| |
| static u64 *alloc_pte(struct protection_domain *domain, |
| unsigned long address, |
| unsigned long page_size, |
| u64 **pte_page, |
| gfp_t gfp, |
| bool *updated) |
| { |
| struct domain_pgtable pgtable; |
| int level, end_lvl; |
| u64 *pte, *page; |
| |
| BUG_ON(!is_power_of_2(page_size)); |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| |
| while (address > PM_LEVEL_SIZE(pgtable.mode)) { |
| /* |
| * Return an error if there is no memory to update the |
| * page-table. |
| */ |
| if (!increase_address_space(domain, address, gfp)) |
| return NULL; |
| |
| /* Read new values to check if update was successful */ |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| } |
| |
| |
| level = pgtable.mode - 1; |
| pte = &pgtable.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 we replace a series of large PTEs, we need |
| * to tear down all of them. |
| */ |
| if (IOMMU_PTE_PRESENT(__pte) && |
| pte_level == PAGE_MODE_7_LEVEL) { |
| unsigned long count, i; |
| u64 *lpte; |
| |
| lpte = first_pte_l7(pte, NULL, &count); |
| |
| /* |
| * Unmap the replicated PTEs that still match the |
| * original large mapping |
| */ |
| for (i = 0; i < count; ++i) |
| cmpxchg64(&lpte[i], __pte, 0ULL); |
| |
| *updated = true; |
| continue; |
| } |
| |
| if (!IOMMU_PTE_PRESENT(__pte) || |
| pte_level == PAGE_MODE_NONE) { |
| 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 (IOMMU_PTE_PRESENT(__pte)) |
| *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) |
| { |
| struct domain_pgtable pgtable; |
| int level; |
| u64 *pte; |
| |
| *page_size = 0; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| |
| if (address > PM_LEVEL_SIZE(pgtable.mode)) |
| return NULL; |
| |
| level = pgtable.mode - 1; |
| pte = &pgtable.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 we have a series of large PTEs, make |
| * sure to return a pointer to the first one. |
| */ |
| if (PM_PTE_LEVEL(*pte) == PAGE_MODE_7_LEVEL) |
| pte = first_pte_l7(pte, page_size, NULL); |
| |
| 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; |
| bool updated = false; |
| u64 __pte, *pte; |
| int ret, i, count; |
| |
| BUG_ON(!IS_ALIGNED(bus_addr, page_size)); |
| BUG_ON(!IS_ALIGNED(phys_addr, page_size)); |
| |
| ret = -EINVAL; |
| if (!(prot & IOMMU_PROT_MASK)) |
| goto out; |
| |
| count = PAGE_SIZE_PTE_COUNT(page_size); |
| pte = alloc_pte(dom, bus_addr, page_size, NULL, gfp, &updated); |
| |
| ret = -ENOMEM; |
| if (!pte) |
| goto out; |
| |
| for (i = 0; i < count; ++i) |
| freelist = free_clear_pte(&pte[i], pte[i], freelist); |
| |
| if (freelist != NULL) |
| 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; |
| |
| ret = 0; |
| |
| out: |
| if (updated) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dom->lock, flags); |
| /* |
| * Flush domain TLB(s) and wait for completion. Any Device-Table |
| * Updates and flushing already happened in |
| * increase_address_space(). |
| */ |
| domain_flush_tlb_pde(dom); |
| domain_flush_complete(dom); |
| spin_unlock_irqrestore(&dom->lock, flags); |
| } |
| |
| /* Everything flushed out, free pages now */ |
| free_page_list(freelist); |
| |
| return ret; |
| } |
| |
| 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 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); |
| } |
| |
| /* |
| * 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 protection_domain *domain) |
| { |
| if (!domain) |
| return; |
| |
| iommu_put_dma_cookie(&domain->domain); |
| |
| free_pagetable(domain); |
| |
| if (domain->id) |
| domain_id_free(domain->id); |
| |
| kfree(domain); |
| } |
| |
| /* |
| * 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 protection_domain *dma_ops_domain_alloc(void) |
| { |
| struct protection_domain *domain; |
| u64 *pt_root, root; |
| |
| domain = kzalloc(sizeof(struct protection_domain), GFP_KERNEL); |
| if (!domain) |
| return NULL; |
| |
| if (protection_domain_init(domain)) |
| goto free_domain; |
| |
| pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| if (!pt_root) |
| goto free_domain; |
| |
| root = amd_iommu_domain_encode_pgtable(pt_root, PAGE_MODE_3_LEVEL); |
| atomic64_set(&domain->pt_root, root); |
| domain->flags = PD_DMA_OPS_MASK; |
| |
| if (iommu_get_dma_cookie(&domain->domain) == -ENOMEM) |
| goto free_domain; |
| |
| return domain; |
| |
| free_domain: |
| dma_ops_domain_free(domain); |
| |
| 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, |
| struct domain_pgtable *pgtable, |
| bool ats, bool ppr) |
| { |
| u64 pte_root = 0; |
| u64 flags = 0; |
| u32 old_domid; |
| |
| if (pgtable->mode != PAGE_MODE_NONE) |
| pte_root = iommu_virt_to_phys(pgtable->root); |
| |
| pte_root |= (pgtable->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; |
| |
| old_domid = amd_iommu_dev_table[devid].data[1] & DEV_DOMID_MASK; |
| amd_iommu_dev_table[devid].data[1] = flags; |
| amd_iommu_dev_table[devid].data[0] = pte_root; |
| |
| /* |
| * A kdump kernel might be replacing a domain ID that was copied from |
| * the previous kernel--if so, it needs to flush the translation cache |
| * entries for the old domain ID that is being overwritten |
| */ |
| if (old_domid) { |
| struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; |
| |
| amd_iommu_flush_tlb_domid(iommu, old_domid); |
| } |
| } |
| |
| 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 domain_pgtable pgtable; |
| struct amd_iommu *iommu; |
| bool ats; |
| |
| iommu = amd_iommu_rlookup_table[dev_data->devid]; |
| 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 */ |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| set_dte_entry(dev_data->devid, domain, &pgtable, |
| ats, dev_data->iommu_v2); |
| clone_aliases(dev_data->pdev); |
| |
| 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; |
| |
| iommu = amd_iommu_rlookup_table[dev_data->devid]; |
| |
| /* Update data structures */ |
| dev_data->domain = NULL; |
| list_del(&dev_data->list); |
| clear_dte_entry(dev_data->devid); |
| clone_aliases(dev_data->pdev); |
| |
| /* 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; |
| } |
| |
| 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; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| dev_data = get_dev_data(dev); |
| |
| spin_lock(&dev_data->lock); |
| |
| ret = -EBUSY; |
| if (dev_data->domain != NULL) |
| goto out; |
| |
| if (!dev_is_pci(dev)) |
| goto skip_ats_check; |
| |
| pdev = to_pci_dev(dev); |
| if (domain->flags & PD_IOMMUV2_MASK) { |
| ret = -EINVAL; |
| if (!dev_data->passthrough) |
| goto out; |
| |
| if (dev_data->iommu_v2) { |
| if (pdev_iommuv2_enable(pdev) != 0) |
| goto out; |
| |
| 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: |
| ret = 0; |
| |
| do_attach(dev_data, domain); |
| |
| /* |
| * 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); |
| |
| domain_flush_complete(domain); |
| |
| out: |
| spin_unlock(&dev_data->lock); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| return ret; |
| } |
| |
| /* |
| * 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; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| spin_lock(&dev_data->lock); |
| |
| /* |
| * 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)) |
| goto out; |
| |
| do_detach(dev_data); |
| |
| if (!dev_is_pci(dev)) |
| goto out; |
| |
| 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; |
| |
| out: |
| spin_unlock(&dev_data->lock); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| } |
| |
| 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 (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 if (domain->type == IOMMU_DOMAIN_DMA) |
| iommu_setup_dma_ops(dev, IOVA_START_PFN << PAGE_SHIFT, 0); |
| |
| 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); |
| } |
| |
| static int amd_iommu_domain_get_attr(struct iommu_domain *domain, |
| enum iommu_attr attr, void *data) |
| { |
| switch (domain->type) { |
| case IOMMU_DOMAIN_UNMANAGED: |
| return -ENODEV; |
| case IOMMU_DOMAIN_DMA: |
| switch (attr) { |
| case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE: |
| *(int *)data = !amd_iommu_unmap_flush; |
| return 0; |
| default: |
| return -ENODEV; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /***************************************************************************** |
| * |
| * The next functions belong to the dma_ops mapping/unmapping code. |
| * |
| *****************************************************************************/ |
| |
| static void update_device_table(struct protection_domain *domain, |
| struct domain_pgtable *pgtable) |
| { |
| struct iommu_dev_data *dev_data; |
| |
| list_for_each_entry(dev_data, &domain->dev_list, list) { |
| set_dte_entry(dev_data->devid, domain, pgtable, |
| dev_data->ats.enabled, dev_data->iommu_v2); |
| clone_aliases(dev_data->pdev); |
| } |
| } |
| |
| static void update_and_flush_device_table(struct protection_domain *domain, |
| struct domain_pgtable *pgtable) |
| { |
| update_device_table(domain, pgtable); |
| domain_flush_devices(domain); |
| } |
| |
| static void update_domain(struct protection_domain *domain) |
| { |
| struct domain_pgtable pgtable; |
| |
| /* Update device table */ |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| update_and_flush_device_table(domain, &pgtable); |
| |
| /* Flush domain TLB(s) and wait for completion */ |
| domain_flush_tlb_pde(domain); |
| domain_flush_complete(domain); |
| } |
| |
| int __init amd_iommu_init_api(void) |
| { |
| int ret, err = 0; |
| |
| ret = iova_cache_get(); |
| 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_default_passthrough() || sme_me_mask) ? 1 : 0; |
| |
| 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(&domain->lock, flags); |
| |
| while (!list_empty(&domain->dev_list)) { |
| entry = list_first_entry(&domain->dev_list, |
| struct iommu_dev_data, list); |
| BUG_ON(!entry->domain); |
| do_detach(entry); |
| } |
| |
| spin_unlock_irqrestore(&domain->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); |
| 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; |
| u64 *pt_root, root; |
| |
| switch (type) { |
| case IOMMU_DOMAIN_UNMANAGED: |
| pdomain = protection_domain_alloc(); |
| if (!pdomain) |
| return NULL; |
| |
| pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| if (!pt_root) { |
| protection_domain_free(pdomain); |
| return NULL; |
| } |
| |
| root = amd_iommu_domain_encode_pgtable(pt_root, PAGE_MODE_3_LEVEL); |
| atomic64_set(&pdomain->pt_root, root); |
| |
| pdomain->domain.geometry.aperture_start = 0; |
| pdomain->domain.geometry.aperture_end = ~0ULL; |
| pdomain->domain.geometry.force_aperture = true; |
| |
| break; |
| case IOMMU_DOMAIN_DMA: |
| pdomain = dma_ops_domain_alloc(); |
| if (!pdomain) { |
| pr_err("Failed to allocate\n"); |
| return NULL; |
| } |
| break; |
| case IOMMU_DOMAIN_IDENTITY: |
| pdomain = protection_domain_alloc(); |
| if (!pdomain) |
| return NULL; |
| |
| atomic64_set(&pdomain->pt_root, 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 domain_pgtable pgtable; |
| |
| 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_ops_domain_free(domain); |
| break; |
| default: |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| |
| if (pgtable.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; |
| dev_data->defer_attach = false; |
| |
| 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, |
| gfp_t gfp) |
| { |
| struct protection_domain *domain = to_pdomain(dom); |
| struct domain_pgtable pgtable; |
| int prot = 0; |
| int ret; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| if (pgtable.mode == PAGE_MODE_NONE) |
| return -EINVAL; |
| |
| if (iommu_prot & IOMMU_READ) |
| prot |= IOMMU_PROT_IR; |
| if (iommu_prot & IOMMU_WRITE) |
| prot |= IOMMU_PROT_IW; |
| |
| ret = iommu_map_page(domain, iova, paddr, page_size, prot, gfp); |
| |
| domain_flush_np_cache(domain, iova, page_size); |
| |
| return ret; |
| } |
| |
| static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova, |
| size_t page_size, |
| struct iommu_iotlb_gather *gather) |
| { |
| struct protection_domain *domain = to_pdomain(dom); |
| struct domain_pgtable pgtable; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| if (pgtable.mode == PAGE_MODE_NONE) |
| return 0; |
| |
| return iommu_unmap_page(domain, iova, page_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; |
| struct domain_pgtable pgtable; |
| u64 *pte, __pte; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| if (pgtable.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 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); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dom->lock, flags); |
| domain_flush_tlb_pde(dom); |
| domain_flush_complete(dom); |
| spin_unlock_irqrestore(&dom->lock, flags); |
| } |
| |
| static void amd_iommu_iotlb_sync(struct iommu_domain *domain, |
| struct iommu_iotlb_gather *gather) |
| { |
| amd_iommu_flush_iotlb_all(domain); |
| } |
| |
| 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, |
| .domain_get_attr = amd_iommu_domain_get_attr, |
| .get_resv_regions = amd_iommu_get_resv_regions, |
| .put_resv_regions = generic_iommu_put_resv_regions, |
| .is_attach_deferred = amd_iommu_is_attach_deferred, |
| .pgsize_bitmap = AMD_IOMMU_PGSIZES, |
| .flush_iotlb_all = amd_iommu_flush_iotlb_all, |
| .iotlb_sync = amd_iommu_iotlb_sync, |
| }; |
| |
| /***************************************************************************** |
| * |
| * 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); |
| struct domain_pgtable pgtable; |
| unsigned long flags; |
| u64 pt_root; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| /* First save pgtable configuration*/ |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| |
| /* Update data structure */ |
| pt_root = amd_iommu_domain_encode_pgtable(NULL, PAGE_MODE_NONE); |
| atomic64_set(&domain->pt_root, pt_root); |
| |
| /* Make changes visible to IOMMUs */ |
| update_domain(domain); |
| |
| /* Restore old pgtable in domain->ptroot to free page-table */ |
| pt_root = amd_iommu_domain_encode_pgtable(pgtable.root, pgtable.mode); |
| atomic64_set(&domain->pt_root, pt_root); |
| |
| /* 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; |
| |
| 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) |
| { |
| struct domain_pgtable pgtable; |
| u64 *pte; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| if (pgtable.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) |
| { |
| struct domain_pgtable pgtable; |
| u64 *pte; |
| |
| amd_iommu_domain_get_pgtable(domain, &pgtable); |
| if (pgtable.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; |
| struct iommu_domain *io_domain; |
| struct device *dev = &pdev->dev; |
| |
| if (!check_device(dev)) |
| return NULL; |
| |
| pdomain = get_dev_data(dev)->domain; |
| if (pdomain == NULL && get_dev_data(dev)->defer_attach) { |
| get_dev_data(dev)->defer_attach = false; |
| io_domain = iommu_get_domain_for_dev(dev); |
| pdomain = to_pdomain(io_domain); |
| attach_device(dev, pdomain); |
| } |
| if (pdomain == NULL) |
| return NULL; |
| |
| if (!dma_ops_domain(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; |
| }
|