| /* |
| * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. |
| * Author: Joerg Roedel <joerg.roedel@amd.com> |
| * Leo Duran <leo.duran@amd.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/ratelimit.h> |
| #include <linux/pci.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/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 <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" |
| |
| #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) |
| |
| #define LOOP_TIMEOUT 100000 |
| |
| /* |
| * 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. |
| * |
| * Traditionally the IOMMU core just handed us the mappings directly, |
| * after making sure the size is an order of a 4KiB page and that the |
| * mapping has natural alignment. |
| * |
| * To retain this behavior, we currently advertise that we support |
| * all page sizes that are an order of 4KiB. |
| * |
| * If at some point we'd like to utilize the IOMMU core's new behavior, |
| * we could change this to advertise the real page sizes we support. |
| */ |
| #define AMD_IOMMU_PGSIZES (~0xFFFUL) |
| |
| static DEFINE_RWLOCK(amd_iommu_devtable_lock); |
| |
| /* A list of preallocated protection domains */ |
| static LIST_HEAD(iommu_pd_list); |
| static DEFINE_SPINLOCK(iommu_pd_list_lock); |
| |
| /* List of all available dev_data structures */ |
| static LIST_HEAD(dev_data_list); |
| static DEFINE_SPINLOCK(dev_data_list_lock); |
| |
| /* |
| * Domain for untranslated devices - only allocated |
| * if iommu=pt passed on kernel cmd line. |
| */ |
| static struct protection_domain *pt_domain; |
| |
| static struct iommu_ops amd_iommu_ops; |
| |
| static ATOMIC_NOTIFIER_HEAD(ppr_notifier); |
| int amd_iommu_max_glx_val = -1; |
| |
| static struct dma_map_ops amd_iommu_dma_ops; |
| |
| /* |
| * general struct to manage commands send to an IOMMU |
| */ |
| struct iommu_cmd { |
| u32 data[4]; |
| }; |
| |
| static void update_domain(struct protection_domain *domain); |
| static int __init alloc_passthrough_domain(void); |
| |
| /**************************************************************************** |
| * |
| * Helper functions |
| * |
| ****************************************************************************/ |
| |
| static struct iommu_dev_data *alloc_dev_data(u16 devid) |
| { |
| struct iommu_dev_data *dev_data; |
| unsigned long flags; |
| |
| dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); |
| if (!dev_data) |
| return NULL; |
| |
| dev_data->devid = devid; |
| atomic_set(&dev_data->bind, 0); |
| |
| spin_lock_irqsave(&dev_data_list_lock, flags); |
| list_add_tail(&dev_data->dev_data_list, &dev_data_list); |
| spin_unlock_irqrestore(&dev_data_list_lock, flags); |
| |
| return dev_data; |
| } |
| |
| static void free_dev_data(struct iommu_dev_data *dev_data) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev_data_list_lock, flags); |
| list_del(&dev_data->dev_data_list); |
| spin_unlock_irqrestore(&dev_data_list_lock, flags); |
| |
| kfree(dev_data); |
| } |
| |
| static struct iommu_dev_data *search_dev_data(u16 devid) |
| { |
| struct iommu_dev_data *dev_data; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev_data_list_lock, flags); |
| list_for_each_entry(dev_data, &dev_data_list, dev_data_list) { |
| if (dev_data->devid == devid) |
| goto out_unlock; |
| } |
| |
| dev_data = NULL; |
| |
| out_unlock: |
| spin_unlock_irqrestore(&dev_data_list_lock, flags); |
| |
| return dev_data; |
| } |
| |
| static struct iommu_dev_data *find_dev_data(u16 devid) |
| { |
| struct iommu_dev_data *dev_data; |
| |
| dev_data = search_dev_data(devid); |
| |
| if (dev_data == NULL) |
| dev_data = alloc_dev_data(devid); |
| |
| return dev_data; |
| } |
| |
| static inline u16 get_device_id(struct device *dev) |
| { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| return calc_devid(pdev->bus->number, pdev->devfn); |
| } |
| |
| static struct iommu_dev_data *get_dev_data(struct device *dev) |
| { |
| return dev->archdata.iommu; |
| } |
| |
| 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; |
| |
| 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; |
| } |
| |
| /* |
| * In this function the list of preallocated protection domains is traversed to |
| * find the domain for a specific device |
| */ |
| static struct dma_ops_domain *find_protection_domain(u16 devid) |
| { |
| struct dma_ops_domain *entry, *ret = NULL; |
| unsigned long flags; |
| u16 alias = amd_iommu_alias_table[devid]; |
| |
| if (list_empty(&iommu_pd_list)) |
| return NULL; |
| |
| spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| |
| list_for_each_entry(entry, &iommu_pd_list, list) { |
| if (entry->target_dev == devid || |
| entry->target_dev == alias) { |
| ret = entry; |
| break; |
| } |
| } |
| |
| spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| |
| return ret; |
| } |
| |
| /* |
| * 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) |
| { |
| u16 devid; |
| |
| if (!dev || !dev->dma_mask) |
| return false; |
| |
| /* No device or no PCI device */ |
| if (dev->bus != &pci_bus_type) |
| return false; |
| |
| devid = get_device_id(dev); |
| |
| /* 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 swap_pci_ref(struct pci_dev **from, struct pci_dev *to) |
| { |
| pci_dev_put(*from); |
| *from = to; |
| } |
| |
| #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) |
| |
| static int iommu_init_device(struct device *dev) |
| { |
| struct pci_dev *dma_pdev, *pdev = to_pci_dev(dev); |
| struct iommu_dev_data *dev_data; |
| struct iommu_group *group; |
| u16 alias; |
| int ret; |
| |
| if (dev->archdata.iommu) |
| return 0; |
| |
| dev_data = find_dev_data(get_device_id(dev)); |
| if (!dev_data) |
| return -ENOMEM; |
| |
| alias = amd_iommu_alias_table[dev_data->devid]; |
| if (alias != dev_data->devid) { |
| struct iommu_dev_data *alias_data; |
| |
| alias_data = find_dev_data(alias); |
| if (alias_data == NULL) { |
| pr_err("AMD-Vi: Warning: Unhandled device %s\n", |
| dev_name(dev)); |
| free_dev_data(dev_data); |
| return -ENOTSUPP; |
| } |
| dev_data->alias_data = alias_data; |
| |
| dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff); |
| } else |
| dma_pdev = pci_dev_get(pdev); |
| |
| /* Account for quirked devices */ |
| swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev)); |
| |
| /* |
| * If it's a multifunction device that does not support our |
| * required ACS flags, add to the same group as function 0. |
| */ |
| if (dma_pdev->multifunction && |
| !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)) |
| swap_pci_ref(&dma_pdev, |
| pci_get_slot(dma_pdev->bus, |
| PCI_DEVFN(PCI_SLOT(dma_pdev->devfn), |
| 0))); |
| |
| /* |
| * Devices on the root bus go through the iommu. If that's not us, |
| * find the next upstream device and test ACS up to the root bus. |
| * Finding the next device may require skipping virtual buses. |
| */ |
| while (!pci_is_root_bus(dma_pdev->bus)) { |
| struct pci_bus *bus = dma_pdev->bus; |
| |
| while (!bus->self) { |
| if (!pci_is_root_bus(bus)) |
| bus = bus->parent; |
| else |
| goto root_bus; |
| } |
| |
| if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) |
| break; |
| |
| swap_pci_ref(&dma_pdev, pci_dev_get(bus->self)); |
| } |
| |
| root_bus: |
| group = iommu_group_get(&dma_pdev->dev); |
| pci_dev_put(dma_pdev); |
| if (!group) { |
| group = iommu_group_alloc(); |
| if (IS_ERR(group)) |
| return PTR_ERR(group); |
| } |
| |
| ret = iommu_group_add_device(group, dev); |
| |
| iommu_group_put(group); |
| |
| if (ret) |
| return ret; |
| |
| if (pci_iommuv2_capable(pdev)) { |
| 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; |
| |
| return 0; |
| } |
| |
| static void iommu_ignore_device(struct device *dev) |
| { |
| u16 devid, alias; |
| |
| devid = get_device_id(dev); |
| alias = amd_iommu_alias_table[devid]; |
| |
| 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) |
| { |
| iommu_group_remove_device(dev); |
| |
| /* |
| * Nothing to do here - 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. |
| */ |
| } |
| |
| void __init amd_iommu_uninit_devices(void) |
| { |
| struct iommu_dev_data *dev_data, *n; |
| struct pci_dev *pdev = NULL; |
| |
| for_each_pci_dev(pdev) { |
| |
| if (!check_device(&pdev->dev)) |
| continue; |
| |
| iommu_uninit_device(&pdev->dev); |
| } |
| |
| /* Free all of our dev_data structures */ |
| list_for_each_entry_safe(dev_data, n, &dev_data_list, dev_data_list) |
| free_dev_data(dev_data); |
| } |
| |
| int __init amd_iommu_init_devices(void) |
| { |
| struct pci_dev *pdev = NULL; |
| int ret = 0; |
| |
| for_each_pci_dev(pdev) { |
| |
| if (!check_device(&pdev->dev)) |
| continue; |
| |
| ret = iommu_init_device(&pdev->dev); |
| if (ret == -ENOTSUPP) |
| iommu_ignore_device(&pdev->dev); |
| else if (ret) |
| goto out_free; |
| } |
| |
| return 0; |
| |
| out_free: |
| |
| amd_iommu_uninit_devices(); |
| |
| return ret; |
| } |
| #ifdef CONFIG_AMD_IOMMU_STATS |
| |
| /* |
| * Initialization code for statistics collection |
| */ |
| |
| DECLARE_STATS_COUNTER(compl_wait); |
| DECLARE_STATS_COUNTER(cnt_map_single); |
| DECLARE_STATS_COUNTER(cnt_unmap_single); |
| DECLARE_STATS_COUNTER(cnt_map_sg); |
| DECLARE_STATS_COUNTER(cnt_unmap_sg); |
| DECLARE_STATS_COUNTER(cnt_alloc_coherent); |
| DECLARE_STATS_COUNTER(cnt_free_coherent); |
| DECLARE_STATS_COUNTER(cross_page); |
| DECLARE_STATS_COUNTER(domain_flush_single); |
| DECLARE_STATS_COUNTER(domain_flush_all); |
| DECLARE_STATS_COUNTER(alloced_io_mem); |
| DECLARE_STATS_COUNTER(total_map_requests); |
| DECLARE_STATS_COUNTER(complete_ppr); |
| DECLARE_STATS_COUNTER(invalidate_iotlb); |
| DECLARE_STATS_COUNTER(invalidate_iotlb_all); |
| DECLARE_STATS_COUNTER(pri_requests); |
| |
| static struct dentry *stats_dir; |
| static struct dentry *de_fflush; |
| |
| static void amd_iommu_stats_add(struct __iommu_counter *cnt) |
| { |
| if (stats_dir == NULL) |
| return; |
| |
| cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir, |
| &cnt->value); |
| } |
| |
| static void amd_iommu_stats_init(void) |
| { |
| stats_dir = debugfs_create_dir("amd-iommu", NULL); |
| if (stats_dir == NULL) |
| return; |
| |
| de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, |
| &amd_iommu_unmap_flush); |
| |
| amd_iommu_stats_add(&compl_wait); |
| amd_iommu_stats_add(&cnt_map_single); |
| amd_iommu_stats_add(&cnt_unmap_single); |
| amd_iommu_stats_add(&cnt_map_sg); |
| amd_iommu_stats_add(&cnt_unmap_sg); |
| amd_iommu_stats_add(&cnt_alloc_coherent); |
| amd_iommu_stats_add(&cnt_free_coherent); |
| amd_iommu_stats_add(&cross_page); |
| amd_iommu_stats_add(&domain_flush_single); |
| amd_iommu_stats_add(&domain_flush_all); |
| amd_iommu_stats_add(&alloced_io_mem); |
| amd_iommu_stats_add(&total_map_requests); |
| amd_iommu_stats_add(&complete_ppr); |
| amd_iommu_stats_add(&invalidate_iotlb); |
| amd_iommu_stats_add(&invalidate_iotlb_all); |
| amd_iommu_stats_add(&pri_requests); |
| } |
| |
| #endif |
| |
| /**************************************************************************** |
| * |
| * Interrupt handling functions |
| * |
| ****************************************************************************/ |
| |
| static void dump_dte_entry(u16 devid) |
| { |
| int i; |
| |
| for (i = 0; i < 4; ++i) |
| pr_err("AMD-Vi: DTE[%d]: %016llx\n", i, |
| amd_iommu_dev_table[devid].data[i]); |
| } |
| |
| static void dump_command(unsigned long phys_addr) |
| { |
| struct iommu_cmd *cmd = phys_to_virt(phys_addr); |
| int i; |
| |
| for (i = 0; i < 4; ++i) |
| pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]); |
| } |
| |
| static void iommu_print_event(struct amd_iommu *iommu, void *__evt) |
| { |
| int type, devid, domid, flags; |
| 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; |
| domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK; |
| 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("AMD-Vi: No event written to event log\n"); |
| return; |
| } |
| udelay(1); |
| goto retry; |
| } |
| |
| printk(KERN_ERR "AMD-Vi: Event logged ["); |
| |
| switch (type) { |
| case EVENT_TYPE_ILL_DEV: |
| printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x " |
| "address=0x%016llx flags=0x%04x]\n", |
| PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| address, flags); |
| dump_dte_entry(devid); |
| break; |
| case EVENT_TYPE_IO_FAULT: |
| printk("IO_PAGE_FAULT device=%02x:%02x.%x " |
| "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| domid, address, flags); |
| break; |
| case EVENT_TYPE_DEV_TAB_ERR: |
| printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| "address=0x%016llx flags=0x%04x]\n", |
| PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| address, flags); |
| break; |
| case EVENT_TYPE_PAGE_TAB_ERR: |
| printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x " |
| "domain=0x%04x address=0x%016llx flags=0x%04x]\n", |
| PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| domid, address, flags); |
| break; |
| case EVENT_TYPE_ILL_CMD: |
| printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); |
| dump_command(address); |
| break; |
| case EVENT_TYPE_CMD_HARD_ERR: |
| printk("COMMAND_HARDWARE_ERROR address=0x%016llx " |
| "flags=0x%04x]\n", address, flags); |
| break; |
| case EVENT_TYPE_IOTLB_INV_TO: |
| printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x " |
| "address=0x%016llx]\n", |
| PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| address); |
| break; |
| case EVENT_TYPE_INV_DEV_REQ: |
| printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x " |
| "address=0x%016llx flags=0x%04x]\n", |
| PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), |
| address, flags); |
| break; |
| default: |
| printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type); |
| } |
| |
| memset(__evt, 0, 4 * sizeof(u32)); |
| } |
| |
| static void iommu_poll_events(struct amd_iommu *iommu) |
| { |
| u32 head, tail; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| |
| 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) % iommu->evt_buf_size; |
| } |
| |
| writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); |
| |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| } |
| |
| static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw) |
| { |
| struct amd_iommu_fault fault; |
| |
| INC_STATS_COUNTER(pri_requests); |
| |
| if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) { |
| pr_err_ratelimited("AMD-Vi: 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) |
| { |
| unsigned long flags; |
| u32 head, tail; |
| |
| if (iommu->ppr_log == NULL) |
| return; |
| |
| /* enable ppr interrupts again */ |
| writel(MMIO_STATUS_PPR_INT_MASK, iommu->mmio_base + MMIO_STATUS_OFFSET); |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| |
| 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); |
| |
| /* |
| * Release iommu->lock because ppr-handling might need to |
| * re-aquire it |
| */ |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| |
| /* Handle PPR entry */ |
| iommu_handle_ppr_entry(iommu, entry); |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| |
| /* Refresh ring-buffer information */ |
| head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); |
| tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); |
| } |
| |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| } |
| |
| irqreturn_t amd_iommu_int_thread(int irq, void *data) |
| { |
| struct amd_iommu *iommu; |
| |
| for_each_iommu(iommu) { |
| iommu_poll_events(iommu); |
| iommu_poll_ppr_log(iommu); |
| } |
| |
| 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("AMD-Vi: Completion-Wait loop timed out\n"); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static void copy_cmd_to_buffer(struct amd_iommu *iommu, |
| struct iommu_cmd *cmd, |
| u32 tail) |
| { |
| u8 *target; |
| |
| target = iommu->cmd_buf + tail; |
| tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; |
| |
| /* Copy command to buffer */ |
| memcpy(target, cmd, sizeof(*cmd)); |
| |
| /* 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) |
| { |
| WARN_ON(address & 0x7ULL); |
| |
| memset(cmd, 0, sizeof(*cmd)); |
| cmd->data[0] = lower_32_bits(__pa(address)) | CMD_COMPL_WAIT_STORE_MASK; |
| cmd->data[1] = upper_32_bits(__pa(address)); |
| 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; |
| int s; |
| |
| pages = iommu_num_pages(address, size, PAGE_SIZE); |
| s = 0; |
| |
| 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 = 1; |
| } |
| |
| 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 wan't 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; |
| int s; |
| |
| pages = iommu_num_pages(address, size, PAGE_SIZE); |
| s = 0; |
| |
| 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 = 1; |
| } |
| |
| 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 & PASID_MASK; |
| 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 & 0xff) << 16; |
| cmd->data[0] |= (qdep & 0xff) << 24; |
| cmd->data[1] = devid; |
| cmd->data[1] |= ((pasid >> 8) & 0xfff) << 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 & PASID_MASK; |
| 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); |
| } |
| |
| /* |
| * 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) |
| { |
| u32 left, tail, head, next_tail; |
| unsigned long flags; |
| |
| WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED); |
| |
| again: |
| spin_lock_irqsave(&iommu->lock, flags); |
| |
| head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); |
| tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); |
| next_tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; |
| left = (head - next_tail) % iommu->cmd_buf_size; |
| |
| if (left <= 2) { |
| struct iommu_cmd sync_cmd; |
| volatile u64 sem = 0; |
| int ret; |
| |
| build_completion_wait(&sync_cmd, (u64)&sem); |
| copy_cmd_to_buffer(iommu, &sync_cmd, tail); |
| |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| |
| if ((ret = wait_on_sem(&sem)) != 0) |
| return ret; |
| |
| goto again; |
| } |
| |
| copy_cmd_to_buffer(iommu, cmd, tail); |
| |
| /* We need to sync now to make sure all commands are processed */ |
| iommu->need_sync = sync; |
| |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| |
| return 0; |
| } |
| |
| 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; |
| volatile u64 sem = 0; |
| int ret; |
| |
| if (!iommu->need_sync) |
| return 0; |
| |
| build_completion_wait(&cmd, (u64)&sem); |
| |
| ret = iommu_queue_command_sync(iommu, &cmd, false); |
| if (ret) |
| return ret; |
| |
| return wait_on_sem(&sem); |
| } |
| |
| 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 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 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 iommu_flush_all(struct amd_iommu *iommu) |
| { |
| struct iommu_cmd cmd; |
| |
| build_inv_all(&cmd); |
| |
| iommu_queue_command(iommu, &cmd); |
| iommu_completion_wait(iommu); |
| } |
| |
| void iommu_flush_all_caches(struct amd_iommu *iommu) |
| { |
| if (iommu_feature(iommu, FEATURE_IA)) { |
| iommu_flush_all(iommu); |
| } else { |
| iommu_flush_dte_all(iommu); |
| 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; |
| int ret; |
| |
| iommu = amd_iommu_rlookup_table[dev_data->devid]; |
| |
| ret = iommu_flush_dte(iommu, dev_data->devid); |
| 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_iommus_present; ++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_iommus_present; ++i) { |
| if (!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. |
| * |
| ****************************************************************************/ |
| |
| /* |
| * 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, |
| 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) { |
| if (!IOMMU_PTE_PRESENT(*pte)) { |
| page = (u64 *)get_zeroed_page(gfp); |
| if (!page) |
| return NULL; |
| *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); |
| } |
| |
| /* No level skipping support yet */ |
| if (PM_PTE_LEVEL(*pte) != 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) |
| { |
| int level; |
| u64 *pte; |
| |
| if (address > PM_LEVEL_SIZE(domain->mode)) |
| return NULL; |
| |
| level = domain->mode - 1; |
| pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; |
| |
| while (level > 0) { |
| |
| /* Not Present */ |
| if (!IOMMU_PTE_PRESENT(*pte)) |
| return NULL; |
| |
| /* Large PTE */ |
| if (PM_PTE_LEVEL(*pte) == 0x07) { |
| unsigned long pte_mask, __pte; |
| |
| /* |
| * If we have a series of large PTEs, make |
| * sure to return a pointer to the first one. |
| */ |
| pte_mask = PTE_PAGE_SIZE(*pte); |
| pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1); |
| __pte = ((unsigned long)pte) & pte_mask; |
| |
| return (u64 *)__pte; |
| } |
| |
| /* 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)]; |
| } |
| |
| return pte; |
| } |
| |
| /* |
| * 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, |
| int prot, |
| unsigned long page_size) |
| { |
| u64 __pte, *pte; |
| int i, count; |
| |
| if (!(prot & IOMMU_PROT_MASK)) |
| return -EINVAL; |
| |
| bus_addr = PAGE_ALIGN(bus_addr); |
| phys_addr = PAGE_ALIGN(phys_addr); |
| count = PAGE_SIZE_PTE_COUNT(page_size); |
| pte = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL); |
| |
| for (i = 0; i < count; ++i) |
| if (IOMMU_PTE_PRESENT(pte[i])) |
| return -EBUSY; |
| |
| if (page_size > PAGE_SIZE) { |
| __pte = PAGE_SIZE_PTE(phys_addr, page_size); |
| __pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_P | IOMMU_PTE_FC; |
| } else |
| __pte = phys_addr | IOMMU_PTE_P | 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); |
| |
| return 0; |
| } |
| |
| static unsigned long iommu_unmap_page(struct protection_domain *dom, |
| unsigned long bus_addr, |
| unsigned long page_size) |
| { |
| unsigned long long unmap_size, unmapped; |
| u64 *pte; |
| |
| BUG_ON(!is_power_of_2(page_size)); |
| |
| unmapped = 0; |
| |
| while (unmapped < page_size) { |
| |
| pte = fetch_pte(dom, bus_addr); |
| |
| if (!pte) { |
| /* |
| * No PTE for this address |
| * move forward in 4kb steps |
| */ |
| unmap_size = PAGE_SIZE; |
| } else if (PM_PTE_LEVEL(*pte) == 0) { |
| /* 4kb PTE found for this address */ |
| unmap_size = PAGE_SIZE; |
| *pte = 0ULL; |
| } else { |
| int count, i; |
| |
| /* Large PTE found which maps this address */ |
| unmap_size = PTE_PAGE_SIZE(*pte); |
| 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(!is_power_of_2(unmapped)); |
| |
| return unmapped; |
| } |
| |
| /* |
| * This function checks if a specific unity mapping entry is needed for |
| * this specific IOMMU. |
| */ |
| static int iommu_for_unity_map(struct amd_iommu *iommu, |
| struct unity_map_entry *entry) |
| { |
| u16 bdf, i; |
| |
| for (i = entry->devid_start; i <= entry->devid_end; ++i) { |
| bdf = amd_iommu_alias_table[i]; |
| if (amd_iommu_rlookup_table[bdf] == iommu) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * This function actually applies the mapping to the page table of the |
| * dma_ops domain. |
| */ |
| static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, |
| struct unity_map_entry *e) |
| { |
| u64 addr; |
| int ret; |
| |
| for (addr = e->address_start; addr < e->address_end; |
| addr += PAGE_SIZE) { |
| ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot, |
| PAGE_SIZE); |
| if (ret) |
| return ret; |
| /* |
| * if unity mapping is in aperture range mark the page |
| * as allocated in the aperture |
| */ |
| if (addr < dma_dom->aperture_size) |
| __set_bit(addr >> PAGE_SHIFT, |
| dma_dom->aperture[0]->bitmap); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Init the unity mappings for a specific IOMMU in the system |
| * |
| * Basically iterates over all unity mapping entries and applies them to |
| * the default domain DMA of that IOMMU if necessary. |
| */ |
| static int iommu_init_unity_mappings(struct amd_iommu *iommu) |
| { |
| struct unity_map_entry *entry; |
| int ret; |
| |
| list_for_each_entry(entry, &amd_iommu_unity_map, list) { |
| if (!iommu_for_unity_map(iommu, entry)) |
| continue; |
| ret = dma_ops_unity_map(iommu->default_dom, entry); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Inits the unity mappings required for a specific device |
| */ |
| static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, |
| u16 devid) |
| { |
| struct unity_map_entry *e; |
| int ret; |
| |
| list_for_each_entry(e, &amd_iommu_unity_map, list) { |
| if (!(devid >= e->devid_start && devid <= e->devid_end)) |
| continue; |
| ret = dma_ops_unity_map(dma_dom, e); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /**************************************************************************** |
| * |
| * The next functions belong to the address allocator for the dma_ops |
| * interface functions. They work like the allocators in the other IOMMU |
| * drivers. Its basically a bitmap which marks the allocated pages in |
| * the aperture. Maybe it could be enhanced in the future to a more |
| * efficient allocator. |
| * |
| ****************************************************************************/ |
| |
| /* |
| * The address allocator core functions. |
| * |
| * called with domain->lock held |
| */ |
| |
| /* |
| * Used to reserve address ranges in the aperture (e.g. for exclusion |
| * ranges. |
| */ |
| static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, |
| unsigned long start_page, |
| unsigned int pages) |
| { |
| unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; |
| |
| if (start_page + pages > last_page) |
| pages = last_page - start_page; |
| |
| for (i = start_page; i < start_page + pages; ++i) { |
| int index = i / APERTURE_RANGE_PAGES; |
| int page = i % APERTURE_RANGE_PAGES; |
| __set_bit(page, dom->aperture[index]->bitmap); |
| } |
| } |
| |
| /* |
| * This function is used to add a new aperture range to an existing |
| * aperture in case of dma_ops domain allocation or address allocation |
| * failure. |
| */ |
| static int alloc_new_range(struct dma_ops_domain *dma_dom, |
| bool populate, gfp_t gfp) |
| { |
| int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; |
| struct amd_iommu *iommu; |
| unsigned long i, old_size; |
| |
| #ifdef CONFIG_IOMMU_STRESS |
| populate = false; |
| #endif |
| |
| if (index >= APERTURE_MAX_RANGES) |
| return -ENOMEM; |
| |
| dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); |
| if (!dma_dom->aperture[index]) |
| return -ENOMEM; |
| |
| dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); |
| if (!dma_dom->aperture[index]->bitmap) |
| goto out_free; |
| |
| dma_dom->aperture[index]->offset = dma_dom->aperture_size; |
| |
| if (populate) { |
| unsigned long address = dma_dom->aperture_size; |
| int i, num_ptes = APERTURE_RANGE_PAGES / 512; |
| u64 *pte, *pte_page; |
| |
| for (i = 0; i < num_ptes; ++i) { |
| pte = alloc_pte(&dma_dom->domain, address, PAGE_SIZE, |
| &pte_page, gfp); |
| if (!pte) |
| goto out_free; |
| |
| dma_dom->aperture[index]->pte_pages[i] = pte_page; |
| |
| address += APERTURE_RANGE_SIZE / 64; |
| } |
| } |
| |
| old_size = dma_dom->aperture_size; |
| dma_dom->aperture_size += APERTURE_RANGE_SIZE; |
| |
| /* Reserve address range used for MSI messages */ |
| if (old_size < MSI_ADDR_BASE_LO && |
| dma_dom->aperture_size > MSI_ADDR_BASE_LO) { |
| unsigned long spage; |
| int pages; |
| |
| pages = iommu_num_pages(MSI_ADDR_BASE_LO, 0x10000, PAGE_SIZE); |
| spage = MSI_ADDR_BASE_LO >> PAGE_SHIFT; |
| |
| dma_ops_reserve_addresses(dma_dom, spage, pages); |
| } |
| |
| /* Initialize the exclusion range if necessary */ |
| for_each_iommu(iommu) { |
| if (iommu->exclusion_start && |
| iommu->exclusion_start >= dma_dom->aperture[index]->offset |
| && iommu->exclusion_start < dma_dom->aperture_size) { |
| unsigned long startpage; |
| int pages = iommu_num_pages(iommu->exclusion_start, |
| iommu->exclusion_length, |
| PAGE_SIZE); |
| startpage = iommu->exclusion_start >> PAGE_SHIFT; |
| dma_ops_reserve_addresses(dma_dom, startpage, pages); |
| } |
| } |
| |
| /* |
| * Check for areas already mapped as present in the new aperture |
| * range and mark those pages as reserved in the allocator. Such |
| * mappings may already exist as a result of requested unity |
| * mappings for devices. |
| */ |
| for (i = dma_dom->aperture[index]->offset; |
| i < dma_dom->aperture_size; |
| i += PAGE_SIZE) { |
| u64 *pte = fetch_pte(&dma_dom->domain, i); |
| if (!pte || !IOMMU_PTE_PRESENT(*pte)) |
| continue; |
| |
| dma_ops_reserve_addresses(dma_dom, i >> PAGE_SHIFT, 1); |
| } |
| |
| update_domain(&dma_dom->domain); |
| |
| return 0; |
| |
| out_free: |
| update_domain(&dma_dom->domain); |
| |
| free_page((unsigned long)dma_dom->aperture[index]->bitmap); |
| |
| kfree(dma_dom->aperture[index]); |
| dma_dom->aperture[index] = NULL; |
| |
| return -ENOMEM; |
| } |
| |
| static unsigned long dma_ops_area_alloc(struct device *dev, |
| struct dma_ops_domain *dom, |
| unsigned int pages, |
| unsigned long align_mask, |
| u64 dma_mask, |
| unsigned long start) |
| { |
| unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE; |
| int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT; |
| int i = start >> APERTURE_RANGE_SHIFT; |
| unsigned long boundary_size; |
| unsigned long address = -1; |
| unsigned long limit; |
| |
| next_bit >>= PAGE_SHIFT; |
| |
| boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, |
| PAGE_SIZE) >> PAGE_SHIFT; |
| |
| for (;i < max_index; ++i) { |
| unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT; |
| |
| if (dom->aperture[i]->offset >= dma_mask) |
| break; |
| |
| limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset, |
| dma_mask >> PAGE_SHIFT); |
| |
| address = iommu_area_alloc(dom->aperture[i]->bitmap, |
| limit, next_bit, pages, 0, |
| boundary_size, align_mask); |
| if (address != -1) { |
| address = dom->aperture[i]->offset + |
| (address << PAGE_SHIFT); |
| dom->next_address = address + (pages << PAGE_SHIFT); |
| break; |
| } |
| |
| next_bit = 0; |
| } |
| |
| return address; |
| } |
| |
| static unsigned long dma_ops_alloc_addresses(struct device *dev, |
| struct dma_ops_domain *dom, |
| unsigned int pages, |
| unsigned long align_mask, |
| u64 dma_mask) |
| { |
| unsigned long address; |
| |
| #ifdef CONFIG_IOMMU_STRESS |
| dom->next_address = 0; |
| dom->need_flush = true; |
| #endif |
| |
| address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
| dma_mask, dom->next_address); |
| |
| if (address == -1) { |
| dom->next_address = 0; |
| address = dma_ops_area_alloc(dev, dom, pages, align_mask, |
| dma_mask, 0); |
| dom->need_flush = true; |
| } |
| |
| if (unlikely(address == -1)) |
| address = DMA_ERROR_CODE; |
| |
| WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); |
| |
| return address; |
| } |
| |
| /* |
| * The address free function. |
| * |
| * called with domain->lock held |
| */ |
| static void dma_ops_free_addresses(struct dma_ops_domain *dom, |
| unsigned long address, |
| unsigned int pages) |
| { |
| unsigned i = address >> APERTURE_RANGE_SHIFT; |
| struct aperture_range *range = dom->aperture[i]; |
| |
| BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL); |
| |
| #ifdef CONFIG_IOMMU_STRESS |
| if (i < 4) |
| return; |
| #endif |
| |
| if (address >= dom->next_address) |
| dom->need_flush = true; |
| |
| address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT; |
| |
| bitmap_clear(range->bitmap, 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. |
| * |
| ****************************************************************************/ |
| |
| /* |
| * This function adds a protection domain to the global protection domain list |
| */ |
| static void add_domain_to_list(struct protection_domain *domain) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| list_add(&domain->list, &amd_iommu_pd_list); |
| spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
| } |
| |
| /* |
| * This function removes a protection domain to the global |
| * protection domain list |
| */ |
| static void del_domain_from_list(struct protection_domain *domain) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&amd_iommu_pd_lock, flags); |
| list_del(&domain->list); |
| spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); |
| } |
| |
| static u16 domain_id_alloc(void) |
| { |
| unsigned long flags; |
| int id; |
| |
| write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| 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; |
| write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| |
| return id; |
| } |
| |
| static void domain_id_free(int id) |
| { |
| unsigned long flags; |
| |
| write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| if (id > 0 && id < MAX_DOMAIN_ID) |
| __clear_bit(id, amd_iommu_pd_alloc_bitmap); |
| write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| } |
| |
| static void free_pagetable(struct protection_domain *domain) |
| { |
| int i, j; |
| u64 *p1, *p2, *p3; |
| |
| p1 = domain->pt_root; |
| |
| if (!p1) |
| return; |
| |
| for (i = 0; i < 512; ++i) { |
| if (!IOMMU_PTE_PRESENT(p1[i])) |
| continue; |
| |
| p2 = IOMMU_PTE_PAGE(p1[i]); |
| for (j = 0; j < 512; ++j) { |
| if (!IOMMU_PTE_PRESENT(p2[j])) |
| continue; |
| p3 = IOMMU_PTE_PAGE(p2[j]); |
| free_page((unsigned long)p3); |
| } |
| |
| free_page((unsigned long)p2); |
| } |
| |
| free_page((unsigned long)p1); |
| |
| domain->pt_root = NULL; |
| } |
| |
| 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 = __va(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 = __va(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 if (domain->glx != 0) |
| BUG(); |
| |
| 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 dma_ops_domain *dom) |
| { |
| int i; |
| |
| if (!dom) |
| return; |
| |
| del_domain_from_list(&dom->domain); |
| |
| free_pagetable(&dom->domain); |
| |
| for (i = 0; i < APERTURE_MAX_RANGES; ++i) { |
| if (!dom->aperture[i]) |
| continue; |
| free_page((unsigned long)dom->aperture[i]->bitmap); |
| kfree(dom->aperture[i]); |
| } |
| |
| 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; |
| |
| spin_lock_init(&dma_dom->domain.lock); |
| |
| dma_dom->domain.id = domain_id_alloc(); |
| if (dma_dom->domain.id == 0) |
| goto free_dma_dom; |
| INIT_LIST_HEAD(&dma_dom->domain.dev_list); |
| dma_dom->domain.mode = PAGE_MODE_2_LEVEL; |
| dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| dma_dom->domain.flags = PD_DMA_OPS_MASK; |
| dma_dom->domain.priv = dma_dom; |
| if (!dma_dom->domain.pt_root) |
| goto free_dma_dom; |
| |
| dma_dom->need_flush = false; |
| dma_dom->target_dev = 0xffff; |
| |
| add_domain_to_list(&dma_dom->domain); |
| |
| if (alloc_new_range(dma_dom, true, GFP_KERNEL)) |
| goto free_dma_dom; |
| |
| /* |
| * mark the first page as allocated so we never return 0 as |
| * a valid dma-address. So we can use 0 as error value |
| */ |
| dma_dom->aperture[0]->bitmap[0] = 1; |
| dma_dom->next_address = 0; |
| |
| |
| 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) |
| { |
| u64 pte_root = 0; |
| u64 flags = 0; |
| |
| if (domain->mode != PAGE_MODE_NONE) |
| pte_root = virt_to_phys(domain->pt_root); |
| |
| pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) |
| << DEV_ENTRY_MODE_SHIFT; |
| pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV; |
| |
| flags = amd_iommu_dev_table[devid].data[1]; |
| |
| if (ats) |
| flags |= DTE_FLAG_IOTLB; |
| |
| if (domain->flags & PD_IOMMUV2_MASK) { |
| u64 gcr3 = __pa(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 &= ~(0xffffUL); |
| 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] = IOMMU_PTE_P | IOMMU_PTE_TV; |
| amd_iommu_dev_table[devid].data[1] = 0; |
| |
| amd_iommu_apply_erratum_63(devid); |
| } |
| |
| static void do_attach(struct iommu_dev_data *dev_data, |
| struct protection_domain *domain) |
| { |
| 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); |
| set_dte_entry(dev_data->devid, domain, ats); |
| |
| /* Do reference counting */ |
| domain->dev_iommu[iommu->index] += 1; |
| domain->dev_cnt += 1; |
| |
| /* Flush the DTE entry */ |
| device_flush_dte(dev_data); |
| } |
| |
| static void do_detach(struct iommu_dev_data *dev_data) |
| { |
| struct amd_iommu *iommu; |
| |
| iommu = amd_iommu_rlookup_table[dev_data->devid]; |
| |
| /* decrease reference counters */ |
| dev_data->domain->dev_iommu[iommu->index] -= 1; |
| dev_data->domain->dev_cnt -= 1; |
| |
| /* Update data structures */ |
| dev_data->domain = NULL; |
| list_del(&dev_data->list); |
| clear_dte_entry(dev_data->devid); |
| |
| /* Flush the DTE entry */ |
| device_flush_dte(dev_data); |
| } |
| |
| /* |
| * If a device is not yet associated with a domain, this function does |
| * assigns it visible for the hardware |
| */ |
| static int __attach_device(struct iommu_dev_data *dev_data, |
| struct protection_domain *domain) |
| { |
| int ret; |
| |
| /* lock domain */ |
| spin_lock(&domain->lock); |
| |
| if (dev_data->alias_data != NULL) { |
| struct iommu_dev_data *alias_data = dev_data->alias_data; |
| |
| /* Some sanity checks */ |
| ret = -EBUSY; |
| if (alias_data->domain != NULL && |
| alias_data->domain != domain) |
| goto out_unlock; |
| |
| if (dev_data->domain != NULL && |
| dev_data->domain != domain) |
| goto out_unlock; |
| |
| /* Do real assignment */ |
| if (alias_data->domain == NULL) |
| do_attach(alias_data, domain); |
| |
| atomic_inc(&alias_data->bind); |
| } |
| |
| if (dev_data->domain == NULL) |
| do_attach(dev_data, domain); |
| |
| atomic_inc(&dev_data->bind); |
| |
| 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; |
| } |
| |
| /* FIXME: Move this to PCI code */ |
| #define PCI_PRI_TLP_OFF (1 << 15) |
| |
| static bool pci_pri_tlp_required(struct pci_dev *pdev) |
| { |
| u16 status; |
| int pos; |
| |
| pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); |
| if (!pos) |
| return false; |
| |
| pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status); |
| |
| return (status & PCI_PRI_TLP_OFF) ? true : false; |
| } |
| |
| /* |
| * If a device is not yet associated with a domain, this function does |
| * assigns it visible for the hardware |
| */ |
| static int attach_device(struct device *dev, |
| struct protection_domain *domain) |
| { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| struct iommu_dev_data *dev_data; |
| unsigned long flags; |
| int ret; |
| |
| dev_data = get_dev_data(dev); |
| |
| if (domain->flags & PD_IOMMUV2_MASK) { |
| if (!dev_data->iommu_v2 || !dev_data->passthrough) |
| return -EINVAL; |
| |
| 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_pri_tlp_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); |
| } |
| |
| write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| ret = __attach_device(dev_data, domain); |
| write_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; |
| unsigned long flags; |
| |
| BUG_ON(!dev_data->domain); |
| |
| domain = dev_data->domain; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| if (dev_data->alias_data != NULL) { |
| struct iommu_dev_data *alias_data = dev_data->alias_data; |
| |
| if (atomic_dec_and_test(&alias_data->bind)) |
| do_detach(alias_data); |
| } |
| |
| if (atomic_dec_and_test(&dev_data->bind)) |
| do_detach(dev_data); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| /* |
| * If we run in passthrough mode the device must be assigned to the |
| * passthrough domain if it is detached from any other domain. |
| * Make sure we can deassign from the pt_domain itself. |
| */ |
| if (dev_data->passthrough && |
| (dev_data->domain == NULL && domain != pt_domain)) |
| __attach_device(dev_data, pt_domain); |
| } |
| |
| /* |
| * 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; |
| |
| /* lock device table */ |
| write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| __detach_device(dev_data); |
| write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| |
| if (domain->flags & PD_IOMMUV2_MASK) |
| 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; |
| } |
| |
| /* |
| * Find out the protection domain structure for a given PCI device. This |
| * will give us the pointer to the page table root for example. |
| */ |
| static struct protection_domain *domain_for_device(struct device *dev) |
| { |
| struct iommu_dev_data *dev_data; |
| struct protection_domain *dom = NULL; |
| unsigned long flags; |
| |
| dev_data = get_dev_data(dev); |
| |
| if (dev_data->domain) |
| return dev_data->domain; |
| |
| if (dev_data->alias_data != NULL) { |
| struct iommu_dev_data *alias_data = dev_data->alias_data; |
| |
| read_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| if (alias_data->domain != NULL) { |
| __attach_device(dev_data, alias_data->domain); |
| dom = alias_data->domain; |
| } |
| read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| } |
| |
| return dom; |
| } |
| |
| static int device_change_notifier(struct notifier_block *nb, |
| unsigned long action, void *data) |
| { |
| struct dma_ops_domain *dma_domain; |
| struct protection_domain *domain; |
| struct iommu_dev_data *dev_data; |
| struct device *dev = data; |
| struct amd_iommu *iommu; |
| unsigned long flags; |
| u16 devid; |
| |
| if (!check_device(dev)) |
| return 0; |
| |
| devid = get_device_id(dev); |
| iommu = amd_iommu_rlookup_table[devid]; |
| dev_data = get_dev_data(dev); |
| |
| switch (action) { |
| case BUS_NOTIFY_UNBOUND_DRIVER: |
| |
| domain = domain_for_device(dev); |
| |
| if (!domain) |
| goto out; |
| if (dev_data->passthrough) |
| break; |
| detach_device(dev); |
| break; |
| case BUS_NOTIFY_ADD_DEVICE: |
| |
| iommu_init_device(dev); |
| |
| /* |
| * dev_data is still NULL and |
| * got initialized in iommu_init_device |
| */ |
| dev_data = get_dev_data(dev); |
| |
| if (iommu_pass_through || dev_data->iommu_v2) { |
| dev_data->passthrough = true; |
| attach_device(dev, pt_domain); |
| break; |
| } |
| |
| domain = domain_for_device(dev); |
| |
| /* allocate a protection domain if a device is added */ |
| dma_domain = find_protection_domain(devid); |
| if (dma_domain) |
| goto out; |
| dma_domain = dma_ops_domain_alloc(); |
| if (!dma_domain) |
| goto out; |
| dma_domain->target_dev = devid; |
| |
| spin_lock_irqsave(&iommu_pd_list_lock, flags); |
| list_add_tail(&dma_domain->list, &iommu_pd_list); |
| spin_unlock_irqrestore(&iommu_pd_list_lock, flags); |
| |
| dev_data = get_dev_data(dev); |
| |
| dev->archdata.dma_ops = &amd_iommu_dma_ops; |
| |
| break; |
| case BUS_NOTIFY_DEL_DEVICE: |
| |
| iommu_uninit_device(dev); |
| |
| default: |
| goto out; |
| } |
| |
| iommu_completion_wait(iommu); |
| |
| out: |
| return 0; |
| } |
| |
| static struct notifier_block device_nb = { |
| .notifier_call = device_change_notifier, |
| }; |
| |
| void amd_iommu_init_notifier(void) |
| { |
| bus_register_notifier(&pci_bus_type, &device_nb); |
| } |
| |
| /***************************************************************************** |
| * |
| * 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 dma_ops_domain *dma_dom; |
| u16 devid = get_device_id(dev); |
| |
| if (!check_device(dev)) |
| return ERR_PTR(-EINVAL); |
| |
| domain = domain_for_device(dev); |
| if (domain != NULL && !dma_ops_domain(domain)) |
| return ERR_PTR(-EBUSY); |
| |
| if (domain != NULL) |
| return domain; |
| |
| /* Device not bount yet - bind it */ |
| dma_dom = find_protection_domain(devid); |
| if (!dma_dom) |
| dma_dom = amd_iommu_rlookup_table[devid]->default_dom; |
| attach_device(dev, &dma_dom->domain); |
| DUMP_printk("Using protection domain %d for device %s\n", |
| dma_dom->domain.id, dev_name(dev)); |
| |
| return &dma_dom->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); |
| } |
| |
| 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; |
| } |
| |
| /* |
| * This function fetches the PTE for a given address in the aperture |
| */ |
| static u64* dma_ops_get_pte(struct dma_ops_domain *dom, |
| unsigned long address) |
| { |
| struct aperture_range *aperture; |
| u64 *pte, *pte_page; |
| |
| aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| if (!aperture) |
| return NULL; |
| |
| pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
| if (!pte) { |
| pte = alloc_pte(&dom->domain, address, PAGE_SIZE, &pte_page, |
| GFP_ATOMIC); |
| aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page; |
| } else |
| pte += PM_LEVEL_INDEX(0, address); |
| |
| update_domain(&dom->domain); |
| |
| return pte; |
| } |
| |
| /* |
| * This is the generic map function. It maps one 4kb page at paddr to |
| * the given address in the DMA address space for the domain. |
| */ |
| static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom, |
| unsigned long address, |
| phys_addr_t paddr, |
| int direction) |
| { |
| u64 *pte, __pte; |
| |
| WARN_ON(address > dom->aperture_size); |
| |
| paddr &= PAGE_MASK; |
| |
| pte = dma_ops_get_pte(dom, address); |
| if (!pte) |
| return DMA_ERROR_CODE; |
| |
| __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; |
| |
| if (direction == DMA_TO_DEVICE) |
| __pte |= IOMMU_PTE_IR; |
| else if (direction == DMA_FROM_DEVICE) |
| __pte |= IOMMU_PTE_IW; |
| else if (direction == DMA_BIDIRECTIONAL) |
| __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW; |
| |
| WARN_ON(*pte); |
| |
| *pte = __pte; |
| |
| return (dma_addr_t)address; |
| } |
| |
| /* |
| * The generic unmapping function for on page in the DMA address space. |
| */ |
| static void dma_ops_domain_unmap(struct dma_ops_domain *dom, |
| unsigned long address) |
| { |
| struct aperture_range *aperture; |
| u64 *pte; |
| |
| if (address >= dom->aperture_size) |
| return; |
| |
| aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; |
| if (!aperture) |
| return; |
| |
| pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; |
| if (!pte) |
| return; |
| |
| pte += PM_LEVEL_INDEX(0, address); |
| |
| WARN_ON(!*pte); |
| |
| *pte = 0ULL; |
| } |
| |
| /* |
| * 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, |
| int dir, |
| bool align, |
| u64 dma_mask) |
| { |
| dma_addr_t offset = paddr & ~PAGE_MASK; |
| dma_addr_t address, start, ret; |
| unsigned int pages; |
| unsigned long align_mask = 0; |
| int i; |
| |
| pages = iommu_num_pages(paddr, size, PAGE_SIZE); |
| paddr &= PAGE_MASK; |
| |
| INC_STATS_COUNTER(total_map_requests); |
| |
| if (pages > 1) |
| INC_STATS_COUNTER(cross_page); |
| |
| if (align) |
| align_mask = (1UL << get_order(size)) - 1; |
| |
| retry: |
| address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, |
| dma_mask); |
| if (unlikely(address == DMA_ERROR_CODE)) { |
| /* |
| * setting next_address here will let the address |
| * allocator only scan the new allocated range in the |
| * first run. This is a small optimization. |
| */ |
| dma_dom->next_address = dma_dom->aperture_size; |
| |
| if (alloc_new_range(dma_dom, false, GFP_ATOMIC)) |
| goto out; |
| |
| /* |
| * aperture was successfully enlarged by 128 MB, try |
| * allocation again |
| */ |
| goto retry; |
| } |
| |
| start = address; |
| for (i = 0; i < pages; ++i) { |
| ret = dma_ops_domain_map(dma_dom, start, paddr, dir); |
| if (ret == DMA_ERROR_CODE) |
| goto out_unmap; |
| |
| paddr += PAGE_SIZE; |
| start += PAGE_SIZE; |
| } |
| address += offset; |
| |
| ADD_STATS_COUNTER(alloced_io_mem, size); |
| |
| if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { |
| domain_flush_tlb(&dma_dom->domain); |
| dma_dom->need_flush = false; |
| } else if (unlikely(amd_iommu_np_cache)) |
| domain_flush_pages(&dma_dom->domain, address, size); |
| |
| out: |
| return address; |
| |
| out_unmap: |
| |
| for (--i; i >= 0; --i) { |
| start -= PAGE_SIZE; |
| dma_ops_domain_unmap(dma_dom, start); |
| } |
| |
| dma_ops_free_addresses(dma_dom, address, pages); |
| |
| return DMA_ERROR_CODE; |
| } |
| |
| /* |
| * 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 flush_addr; |
| dma_addr_t i, start; |
| unsigned int pages; |
| |
| if ((dma_addr == DMA_ERROR_CODE) || |
| (dma_addr + size > dma_dom->aperture_size)) |
| return; |
| |
| flush_addr = dma_addr; |
| pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); |
| dma_addr &= PAGE_MASK; |
| start = dma_addr; |
| |
| for (i = 0; i < pages; ++i) { |
| dma_ops_domain_unmap(dma_dom, start); |
| start += PAGE_SIZE; |
| } |
| |
| SUB_STATS_COUNTER(alloced_io_mem, size); |
| |
| dma_ops_free_addresses(dma_dom, dma_addr, pages); |
| |
| if (amd_iommu_unmap_flush || dma_dom->need_flush) { |
| domain_flush_pages(&dma_dom->domain, flush_addr, size); |
| dma_dom->need_flush = false; |
| } |
| } |
| |
| /* |
| * 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, |
| struct dma_attrs *attrs) |
| { |
| unsigned long flags; |
| struct protection_domain *domain; |
| dma_addr_t addr; |
| u64 dma_mask; |
| phys_addr_t paddr = page_to_phys(page) + offset; |
| |
| INC_STATS_COUNTER(cnt_map_single); |
| |
| domain = get_domain(dev); |
| if (PTR_ERR(domain) == -EINVAL) |
| return (dma_addr_t)paddr; |
| else if (IS_ERR(domain)) |
| return DMA_ERROR_CODE; |
| |
| dma_mask = *dev->dma_mask; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| addr = __map_single(dev, domain->priv, paddr, size, dir, false, |
| dma_mask); |
| if (addr == DMA_ERROR_CODE) |
| goto out; |
| |
| domain_flush_complete(domain); |
| |
| out: |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| return addr; |
| } |
| |
| /* |
| * 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, struct dma_attrs *attrs) |
| { |
| unsigned long flags; |
| struct protection_domain *domain; |
| |
| INC_STATS_COUNTER(cnt_unmap_single); |
| |
| domain = get_domain(dev); |
| if (IS_ERR(domain)) |
| return; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| __unmap_single(domain->priv, dma_addr, size, dir); |
| |
| domain_flush_complete(domain); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| } |
| |
| /* |
| * This is a special map_sg function which is used if we should map a |
| * device which is not handled by an AMD IOMMU in the system. |
| */ |
| static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, |
| int nelems, int dir) |
| { |
| struct scatterlist *s; |
| int i; |
| |
| for_each_sg(sglist, s, nelems, i) { |
| s->dma_address = (dma_addr_t)sg_phys(s); |
| s->dma_length = s->length; |
| } |
| |
| return nelems; |
| } |
| |
| /* |
| * 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 dir, |
| struct dma_attrs *attrs) |
| { |
| unsigned long flags; |
| struct protection_domain *domain; |
| int i; |
| struct scatterlist *s; |
| phys_addr_t paddr; |
| int mapped_elems = 0; |
| u64 dma_mask; |
| |
| INC_STATS_COUNTER(cnt_map_sg); |
| |
| domain = get_domain(dev); |
| if (PTR_ERR(domain) == -EINVAL) |
| return map_sg_no_iommu(dev, sglist, nelems, dir); |
| else if (IS_ERR(domain)) |
| return 0; |
| |
| dma_mask = *dev->dma_mask; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| for_each_sg(sglist, s, nelems, i) { |
| paddr = sg_phys(s); |
| |
| s->dma_address = __map_single(dev, domain->priv, |
| paddr, s->length, dir, false, |
| dma_mask); |
| |
| if (s->dma_address) { |
| s->dma_length = s->length; |
| mapped_elems++; |
| } else |
| goto unmap; |
| } |
| |
| domain_flush_complete(domain); |
| |
| out: |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| return mapped_elems; |
| unmap: |
| for_each_sg(sglist, s, mapped_elems, i) { |
| if (s->dma_address) |
| __unmap_single(domain->priv, s->dma_address, |
| s->dma_length, dir); |
| s->dma_address = s->dma_length = 0; |
| } |
| |
| mapped_elems = 0; |
| |
| goto out; |
| } |
| |
| /* |
| * 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, |
| struct dma_attrs *attrs) |
| { |
| unsigned long flags; |
| struct protection_domain *domain; |
| struct scatterlist *s; |
| int i; |
| |
| INC_STATS_COUNTER(cnt_unmap_sg); |
| |
| domain = get_domain(dev); |
| if (IS_ERR(domain)) |
| return; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| for_each_sg(sglist, s, nelems, i) { |
| __unmap_single(domain->priv, s->dma_address, |
| s->dma_length, dir); |
| s->dma_address = s->dma_length = 0; |
| } |
| |
| domain_flush_complete(domain); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| } |
| |
| /* |
| * 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, |
| struct dma_attrs *attrs) |
| { |
| unsigned long flags; |
| void *virt_addr; |
| struct protection_domain *domain; |
| phys_addr_t paddr; |
| u64 dma_mask = dev->coherent_dma_mask; |
| |
| INC_STATS_COUNTER(cnt_alloc_coherent); |
| |
| domain = get_domain(dev); |
| if (PTR_ERR(domain) == -EINVAL) { |
| virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| *dma_addr = __pa(virt_addr); |
| return virt_addr; |
| } else if (IS_ERR(domain)) |
| return NULL; |
| |
| dma_mask = dev->coherent_dma_mask; |
| flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| flag |= __GFP_ZERO; |
| |
| virt_addr = (void *)__get_free_pages(flag, get_order(size)); |
| if (!virt_addr) |
| return NULL; |
| |
| paddr = virt_to_phys(virt_addr); |
| |
| if (!dma_mask) |
| dma_mask = *dev->dma_mask; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| *dma_addr = __map_single(dev, domain->priv, paddr, |
| size, DMA_BIDIRECTIONAL, true, dma_mask); |
| |
| if (*dma_addr == DMA_ERROR_CODE) { |
| spin_unlock_irqrestore(&domain->lock, flags); |
| goto out_free; |
| } |
| |
| domain_flush_complete(domain); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| return virt_addr; |
| |
| out_free: |
| |
| free_pages((unsigned long)virt_addr, 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, |
| struct dma_attrs *attrs) |
| { |
| unsigned long flags; |
| struct protection_domain *domain; |
| |
| INC_STATS_COUNTER(cnt_free_coherent); |
| |
| domain = get_domain(dev); |
| if (IS_ERR(domain)) |
| goto free_mem; |
| |
| spin_lock_irqsave(&domain->lock, flags); |
| |
| __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); |
| |
| domain_flush_complete(domain); |
| |
| spin_unlock_irqrestore(&domain->lock, flags); |
| |
| free_mem: |
| free_pages((unsigned long)virt_addr, 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) |
| { |
| return check_device(dev); |
| } |
| |
| /* |
| * The function for pre-allocating protection domains. |
| * |
| * If the driver core informs the DMA layer if a driver grabs a device |
| * we don't need to preallocate the protection domains anymore. |
| * For now we have to. |
| */ |
| static void __init prealloc_protection_domains(void) |
| { |
| struct iommu_dev_data *dev_data; |
| struct dma_ops_domain *dma_dom; |
| struct pci_dev *dev = NULL; |
| u16 devid; |
| |
| for_each_pci_dev(dev) { |
| |
| /* Do we handle this device? */ |
| if (!check_device(&dev->dev)) |
| continue; |
| |
| dev_data = get_dev_data(&dev->dev); |
| if (!amd_iommu_force_isolation && dev_data->iommu_v2) { |
| /* Make sure passthrough domain is allocated */ |
| alloc_passthrough_domain(); |
| dev_data->passthrough = true; |
| attach_device(&dev->dev, pt_domain); |
| pr_info("AMD-Vi: Using passthough domain for device %s\n", |
| dev_name(&dev->dev)); |
| } |
| |
| /* Is there already any domain for it? */ |
| if (domain_for_device(&dev->dev)) |
| continue; |
| |
| devid = get_device_id(&dev->dev); |
| |
| dma_dom = dma_ops_domain_alloc(); |
| if (!dma_dom) |
| continue; |
| init_unity_mappings_for_device(dma_dom, devid); |
| dma_dom->target_dev = devid; |
| |
| attach_device(&dev->dev, &dma_dom->domain); |
| |
| list_add_tail(&dma_dom->list, &iommu_pd_list); |
| } |
| } |
| |
| static 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 unsigned device_dma_ops_init(void) |
| { |
| struct iommu_dev_data *dev_data; |
| struct pci_dev *pdev = NULL; |
| unsigned unhandled = 0; |
| |
| for_each_pci_dev(pdev) { |
| if (!check_device(&pdev->dev)) { |
| |
| iommu_ignore_device(&pdev->dev); |
| |
| unhandled += 1; |
| continue; |
| } |
| |
| dev_data = get_dev_data(&pdev->dev); |
| |
| if (!dev_data->passthrough) |
| pdev->dev.archdata.dma_ops = &amd_iommu_dma_ops; |
| else |
| pdev->dev.archdata.dma_ops = &nommu_dma_ops; |
| } |
| |
| return unhandled; |
| } |
| |
| /* |
| * The function which clues the AMD IOMMU driver into dma_ops. |
| */ |
| |
| void __init amd_iommu_init_api(void) |
| { |
| bus_set_iommu(&pci_bus_type, &amd_iommu_ops); |
| } |
| |
| int __init amd_iommu_init_dma_ops(void) |
| { |
| struct amd_iommu *iommu; |
| int ret, unhandled; |
| |
| /* |
| * first allocate a default protection domain for every IOMMU we |
| * found in the system. Devices not assigned to any other |
| * protection domain will be assigned to the default one. |
| */ |
| for_each_iommu(iommu) { |
| iommu->default_dom = dma_ops_domain_alloc(); |
| if (iommu->default_dom == NULL) |
| return -ENOMEM; |
| iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; |
| ret = iommu_init_unity_mappings(iommu); |
| if (ret) |
| goto free_domains; |
| } |
| |
| /* |
| * Pre-allocate the protection domains for each device. |
| */ |
| prealloc_protection_domains(); |
| |
| iommu_detected = 1; |
| swiotlb = 0; |
| |
| /* Make the driver finally visible to the drivers */ |
| unhandled = device_dma_ops_init(); |
| if (unhandled && max_pfn > MAX_DMA32_PFN) { |
| /* There are unhandled devices - initialize swiotlb for them */ |
| swiotlb = 1; |
| } |
| |
| amd_iommu_stats_init(); |
| |
| if (amd_iommu_unmap_flush) |
| pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n"); |
| else |
| pr_info("AMD-Vi: Lazy IO/TLB flushing enabled\n"); |
| |
| return 0; |
| |
| free_domains: |
| |
| for_each_iommu(iommu) { |
| if (iommu->default_dom) |
| dma_ops_domain_free(iommu->default_dom); |
| } |
| |
| return ret; |
| } |
| |
| /***************************************************************************** |
| * |
| * 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 *dev_data, *next; |
| unsigned long flags; |
| |
| write_lock_irqsave(&amd_iommu_devtable_lock, flags); |
| |
| list_for_each_entry_safe(dev_data, next, &domain->dev_list, list) { |
| __detach_device(dev_data); |
| atomic_set(&dev_data->bind, 0); |
| } |
| |
| write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); |
| } |
| |
| static void protection_domain_free(struct protection_domain *domain) |
| { |
| if (!domain) |
| return; |
| |
| del_domain_from_list(domain); |
| |
| if (domain->id) |
| domain_id_free(domain->id); |
| |
| kfree(domain); |
| } |
| |
| static struct protection_domain *protection_domain_alloc(void) |
| { |
| struct protection_domain *domain; |
| |
| domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
| if (!domain) |
| return NULL; |
| |
| spin_lock_init(&domain->lock); |
| mutex_init(&domain->api_lock); |
| domain->id = domain_id_alloc(); |
| if (!domain->id) |
| goto out_err; |
| INIT_LIST_HEAD(&domain->dev_list); |
| |
| add_domain_to_list(domain); |
| |
| return domain; |
| |
| out_err: |
| kfree(domain); |
| |
| return NULL; |
| } |
| |
| static int __init alloc_passthrough_domain(void) |
| { |
| if (pt_domain != NULL) |
| return 0; |
| |
| /* allocate passthrough domain */ |
| pt_domain = protection_domain_alloc(); |
| if (!pt_domain) |
| return -ENOMEM; |
| |
| pt_domain->mode = PAGE_MODE_NONE; |
| |
| return 0; |
| } |
| static int amd_iommu_domain_init(struct iommu_domain *dom) |
| { |
| struct protection_domain *domain; |
| |
| domain = protection_domain_alloc(); |
| if (!domain) |
| goto out_free; |
| |
| domain->mode = PAGE_MODE_3_LEVEL; |
| domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); |
| if (!domain->pt_root) |
| goto out_free; |
| |
| domain->iommu_domain = dom; |
| |
| dom->priv = domain; |
| |
| dom->geometry.aperture_start = 0; |
| dom->geometry.aperture_end = ~0ULL; |
| dom->geometry.force_aperture = true; |
| |
| return 0; |
| |
| out_free: |
| protection_domain_free(domain); |
| |
| return -ENOMEM; |
| } |
| |
| static void amd_iommu_domain_destroy(struct iommu_domain *dom) |
| { |
| struct protection_domain *domain = dom->priv; |
| |
| if (!domain) |
| return; |
| |
| if (domain->dev_cnt > 0) |
| cleanup_domain(domain); |
| |
| BUG_ON(domain->dev_cnt != 0); |
| |
| if (domain->mode != PAGE_MODE_NONE) |
| free_pagetable(domain); |
| |
| if (domain->flags & PD_IOMMUV2_MASK) |
| free_gcr3_table(domain); |
| |
| protection_domain_free(domain); |
| |
| dom->priv = NULL; |
| } |
| |
| 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; |
| u16 devid; |
| |
| if (!check_device(dev)) |
| return; |
| |
| devid = get_device_id(dev); |
| |
| if (dev_data->domain != NULL) |
| detach_device(dev); |
| |
| iommu = amd_iommu_rlookup_table[devid]; |
| if (!iommu) |
| return; |
| |
| iommu_completion_wait(iommu); |
| } |
| |
| static int amd_iommu_attach_device(struct iommu_domain *dom, |
| struct device *dev) |
| { |
| struct protection_domain *domain = dom->priv; |
| 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); |
| |
| 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 = dom->priv; |
| 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, prot, page_size); |
| 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 = dom->priv; |
| size_t unmap_size; |
| |
| if (domain->mode == PAGE_MODE_NONE) |
| return - |