2 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <jroedel@suse.de>
4 * Leo Duran <leo.duran@amd.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/ratelimit.h>
21 #include <linux/pci.h>
22 #include <linux/pci-ats.h>
23 #include <linux/bitmap.h>
24 #include <linux/slab.h>
25 #include <linux/debugfs.h>
26 #include <linux/scatterlist.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/iommu-helper.h>
29 #include <linux/iommu.h>
30 #include <linux/delay.h>
31 #include <linux/amd-iommu.h>
32 #include <linux/notifier.h>
33 #include <linux/export.h>
34 #include <linux/irq.h>
35 #include <linux/msi.h>
36 #include <linux/dma-contiguous.h>
37 #include <linux/irqdomain.h>
38 #include <asm/irq_remapping.h>
39 #include <asm/io_apic.h>
41 #include <asm/hw_irq.h>
42 #include <asm/msidef.h>
43 #include <asm/proto.h>
44 #include <asm/iommu.h>
48 #include "amd_iommu_proto.h"
49 #include "amd_iommu_types.h"
50 #include "irq_remapping.h"
52 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
54 #define LOOP_TIMEOUT 100000
57 * This bitmap is used to advertise the page sizes our hardware support
58 * to the IOMMU core, which will then use this information to split
59 * physically contiguous memory regions it is mapping into page sizes
62 * 512GB Pages are not supported due to a hardware bug
64 #define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
66 static DEFINE_RWLOCK(amd_iommu_devtable_lock);
68 /* List of all available dev_data structures */
69 static LIST_HEAD(dev_data_list);
70 static DEFINE_SPINLOCK(dev_data_list_lock);
72 LIST_HEAD(ioapic_map);
76 * Domain for untranslated devices - only allocated
77 * if iommu=pt passed on kernel cmd line.
79 static const struct iommu_ops amd_iommu_ops;
81 static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
82 int amd_iommu_max_glx_val = -1;
84 static struct dma_map_ops amd_iommu_dma_ops;
87 * This struct contains device specific data for the IOMMU
89 struct iommu_dev_data {
90 struct list_head list; /* For domain->dev_list */
91 struct list_head dev_data_list; /* For global dev_data_list */
92 struct list_head alias_list; /* Link alias-groups together */
93 struct iommu_dev_data *alias_data;/* The alias dev_data */
94 struct protection_domain *domain; /* Domain the device is bound to */
95 u16 devid; /* PCI Device ID */
96 bool iommu_v2; /* Device can make use of IOMMUv2 */
97 bool passthrough; /* Device is identity mapped */
101 } ats; /* ATS state */
102 bool pri_tlp; /* PASID TLB required for
104 u32 errata; /* Bitmap for errata to apply */
108 * general struct to manage commands send to an IOMMU
114 struct kmem_cache *amd_iommu_irq_cache;
116 static void update_domain(struct protection_domain *domain);
117 static int protection_domain_init(struct protection_domain *domain);
119 /****************************************************************************
123 ****************************************************************************/
125 static struct protection_domain *to_pdomain(struct iommu_domain *dom)
127 return container_of(dom, struct protection_domain, domain);
130 static struct iommu_dev_data *alloc_dev_data(u16 devid)
132 struct iommu_dev_data *dev_data;
135 dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
139 INIT_LIST_HEAD(&dev_data->alias_list);
141 dev_data->devid = devid;
143 spin_lock_irqsave(&dev_data_list_lock, flags);
144 list_add_tail(&dev_data->dev_data_list, &dev_data_list);
145 spin_unlock_irqrestore(&dev_data_list_lock, flags);
150 static void free_dev_data(struct iommu_dev_data *dev_data)
154 spin_lock_irqsave(&dev_data_list_lock, flags);
155 list_del(&dev_data->dev_data_list);
156 spin_unlock_irqrestore(&dev_data_list_lock, flags);
161 static struct iommu_dev_data *search_dev_data(u16 devid)
163 struct iommu_dev_data *dev_data;
166 spin_lock_irqsave(&dev_data_list_lock, flags);
167 list_for_each_entry(dev_data, &dev_data_list, dev_data_list) {
168 if (dev_data->devid == devid)
175 spin_unlock_irqrestore(&dev_data_list_lock, flags);
180 static struct iommu_dev_data *find_dev_data(u16 devid)
182 struct iommu_dev_data *dev_data;
184 dev_data = search_dev_data(devid);
186 if (dev_data == NULL)
187 dev_data = alloc_dev_data(devid);
192 static inline u16 get_device_id(struct device *dev)
194 struct pci_dev *pdev = to_pci_dev(dev);
196 return PCI_DEVID(pdev->bus->number, pdev->devfn);
199 static struct iommu_dev_data *get_dev_data(struct device *dev)
201 return dev->archdata.iommu;
204 static bool pci_iommuv2_capable(struct pci_dev *pdev)
206 static const int caps[] = {
209 PCI_EXT_CAP_ID_PASID,
213 for (i = 0; i < 3; ++i) {
214 pos = pci_find_ext_capability(pdev, caps[i]);
222 static bool pdev_pri_erratum(struct pci_dev *pdev, u32 erratum)
224 struct iommu_dev_data *dev_data;
226 dev_data = get_dev_data(&pdev->dev);
228 return dev_data->errata & (1 << erratum) ? true : false;
232 * This function actually applies the mapping to the page table of the
235 static void alloc_unity_mapping(struct dma_ops_domain *dma_dom,
236 struct unity_map_entry *e)
240 for (addr = e->address_start; addr < e->address_end;
242 if (addr < dma_dom->aperture_size)
243 __set_bit(addr >> PAGE_SHIFT,
244 dma_dom->aperture[0]->bitmap);
249 * Inits the unity mappings required for a specific device
251 static void init_unity_mappings_for_device(struct device *dev,
252 struct dma_ops_domain *dma_dom)
254 struct unity_map_entry *e;
257 devid = get_device_id(dev);
259 list_for_each_entry(e, &amd_iommu_unity_map, list) {
260 if (!(devid >= e->devid_start && devid <= e->devid_end))
262 alloc_unity_mapping(dma_dom, e);
267 * This function checks if the driver got a valid device from the caller to
268 * avoid dereferencing invalid pointers.
270 static bool check_device(struct device *dev)
274 if (!dev || !dev->dma_mask)
278 if (!dev_is_pci(dev))
281 devid = get_device_id(dev);
283 /* Out of our scope? */
284 if (devid > amd_iommu_last_bdf)
287 if (amd_iommu_rlookup_table[devid] == NULL)
293 static void init_iommu_group(struct device *dev)
295 struct dma_ops_domain *dma_domain;
296 struct iommu_domain *domain;
297 struct iommu_group *group;
299 group = iommu_group_get_for_dev(dev);
303 domain = iommu_group_default_domain(group);
307 dma_domain = to_pdomain(domain)->priv;
309 init_unity_mappings_for_device(dev, dma_domain);
311 iommu_group_put(group);
314 static int __last_alias(struct pci_dev *pdev, u16 alias, void *data)
316 *(u16 *)data = alias;
320 static u16 get_alias(struct device *dev)
322 struct pci_dev *pdev = to_pci_dev(dev);
323 u16 devid, ivrs_alias, pci_alias;
325 devid = get_device_id(dev);
326 ivrs_alias = amd_iommu_alias_table[devid];
327 pci_for_each_dma_alias(pdev, __last_alias, &pci_alias);
329 if (ivrs_alias == pci_alias)
335 * The IVRS is fairly reliable in telling us about aliases, but it
336 * can't know about every screwy device. If we don't have an IVRS
337 * reported alias, use the PCI reported alias. In that case we may
338 * still need to initialize the rlookup and dev_table entries if the
339 * alias is to a non-existent device.
341 if (ivrs_alias == devid) {
342 if (!amd_iommu_rlookup_table[pci_alias]) {
343 amd_iommu_rlookup_table[pci_alias] =
344 amd_iommu_rlookup_table[devid];
345 memcpy(amd_iommu_dev_table[pci_alias].data,
346 amd_iommu_dev_table[devid].data,
347 sizeof(amd_iommu_dev_table[pci_alias].data));
353 pr_info("AMD-Vi: Using IVRS reported alias %02x:%02x.%d "
354 "for device %s[%04x:%04x], kernel reported alias "
355 "%02x:%02x.%d\n", PCI_BUS_NUM(ivrs_alias), PCI_SLOT(ivrs_alias),
356 PCI_FUNC(ivrs_alias), dev_name(dev), pdev->vendor, pdev->device,
357 PCI_BUS_NUM(pci_alias), PCI_SLOT(pci_alias),
358 PCI_FUNC(pci_alias));
361 * If we don't have a PCI DMA alias and the IVRS alias is on the same
362 * bus, then the IVRS table may know about a quirk that we don't.
364 if (pci_alias == devid &&
365 PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) {
366 pdev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
367 pdev->dma_alias_devfn = ivrs_alias & 0xff;
368 pr_info("AMD-Vi: Added PCI DMA alias %02x.%d for %s\n",
369 PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias),
376 static int iommu_init_device(struct device *dev)
378 struct pci_dev *pdev = to_pci_dev(dev);
379 struct iommu_dev_data *dev_data;
382 if (dev->archdata.iommu)
385 dev_data = find_dev_data(get_device_id(dev));
389 alias = get_alias(dev);
391 if (alias != dev_data->devid) {
392 struct iommu_dev_data *alias_data;
394 alias_data = find_dev_data(alias);
395 if (alias_data == NULL) {
396 pr_err("AMD-Vi: Warning: Unhandled device %s\n",
398 free_dev_data(dev_data);
401 dev_data->alias_data = alias_data;
403 /* Add device to the alias_list */
404 list_add(&dev_data->alias_list, &alias_data->alias_list);
407 if (pci_iommuv2_capable(pdev)) {
408 struct amd_iommu *iommu;
410 iommu = amd_iommu_rlookup_table[dev_data->devid];
411 dev_data->iommu_v2 = iommu->is_iommu_v2;
414 dev->archdata.iommu = dev_data;
416 iommu_device_link(amd_iommu_rlookup_table[dev_data->devid]->iommu_dev,
422 static void iommu_ignore_device(struct device *dev)
426 devid = get_device_id(dev);
427 alias = amd_iommu_alias_table[devid];
429 memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
430 memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry));
432 amd_iommu_rlookup_table[devid] = NULL;
433 amd_iommu_rlookup_table[alias] = NULL;
436 static void iommu_uninit_device(struct device *dev)
438 struct iommu_dev_data *dev_data = search_dev_data(get_device_id(dev));
443 iommu_device_unlink(amd_iommu_rlookup_table[dev_data->devid]->iommu_dev,
446 iommu_group_remove_device(dev);
448 /* Unlink from alias, it may change if another device is re-plugged */
449 dev_data->alias_data = NULL;
452 dev->archdata.dma_ops = NULL;
455 * We keep dev_data around for unplugged devices and reuse it when the
456 * device is re-plugged - not doing so would introduce a ton of races.
460 #ifdef CONFIG_AMD_IOMMU_STATS
463 * Initialization code for statistics collection
466 DECLARE_STATS_COUNTER(compl_wait);
467 DECLARE_STATS_COUNTER(cnt_map_single);
468 DECLARE_STATS_COUNTER(cnt_unmap_single);
469 DECLARE_STATS_COUNTER(cnt_map_sg);
470 DECLARE_STATS_COUNTER(cnt_unmap_sg);
471 DECLARE_STATS_COUNTER(cnt_alloc_coherent);
472 DECLARE_STATS_COUNTER(cnt_free_coherent);
473 DECLARE_STATS_COUNTER(cross_page);
474 DECLARE_STATS_COUNTER(domain_flush_single);
475 DECLARE_STATS_COUNTER(domain_flush_all);
476 DECLARE_STATS_COUNTER(alloced_io_mem);
477 DECLARE_STATS_COUNTER(total_map_requests);
478 DECLARE_STATS_COUNTER(complete_ppr);
479 DECLARE_STATS_COUNTER(invalidate_iotlb);
480 DECLARE_STATS_COUNTER(invalidate_iotlb_all);
481 DECLARE_STATS_COUNTER(pri_requests);
483 static struct dentry *stats_dir;
484 static struct dentry *de_fflush;
486 static void amd_iommu_stats_add(struct __iommu_counter *cnt)
488 if (stats_dir == NULL)
491 cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir,
495 static void amd_iommu_stats_init(void)
497 stats_dir = debugfs_create_dir("amd-iommu", NULL);
498 if (stats_dir == NULL)
501 de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
502 &amd_iommu_unmap_flush);
504 amd_iommu_stats_add(&compl_wait);
505 amd_iommu_stats_add(&cnt_map_single);
506 amd_iommu_stats_add(&cnt_unmap_single);
507 amd_iommu_stats_add(&cnt_map_sg);
508 amd_iommu_stats_add(&cnt_unmap_sg);
509 amd_iommu_stats_add(&cnt_alloc_coherent);
510 amd_iommu_stats_add(&cnt_free_coherent);
511 amd_iommu_stats_add(&cross_page);
512 amd_iommu_stats_add(&domain_flush_single);
513 amd_iommu_stats_add(&domain_flush_all);
514 amd_iommu_stats_add(&alloced_io_mem);
515 amd_iommu_stats_add(&total_map_requests);
516 amd_iommu_stats_add(&complete_ppr);
517 amd_iommu_stats_add(&invalidate_iotlb);
518 amd_iommu_stats_add(&invalidate_iotlb_all);
519 amd_iommu_stats_add(&pri_requests);
524 /****************************************************************************
526 * Interrupt handling functions
528 ****************************************************************************/
530 static void dump_dte_entry(u16 devid)
534 for (i = 0; i < 4; ++i)
535 pr_err("AMD-Vi: DTE[%d]: %016llx\n", i,
536 amd_iommu_dev_table[devid].data[i]);
539 static void dump_command(unsigned long phys_addr)
541 struct iommu_cmd *cmd = phys_to_virt(phys_addr);
544 for (i = 0; i < 4; ++i)
545 pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
548 static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
550 int type, devid, domid, flags;
551 volatile u32 *event = __evt;
556 type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
557 devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
558 domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
559 flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
560 address = (u64)(((u64)event[3]) << 32) | event[2];
563 /* Did we hit the erratum? */
564 if (++count == LOOP_TIMEOUT) {
565 pr_err("AMD-Vi: No event written to event log\n");
572 printk(KERN_ERR "AMD-Vi: Event logged [");
575 case EVENT_TYPE_ILL_DEV:
576 printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x "
577 "address=0x%016llx flags=0x%04x]\n",
578 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
580 dump_dte_entry(devid);
582 case EVENT_TYPE_IO_FAULT:
583 printk("IO_PAGE_FAULT device=%02x:%02x.%x "
584 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
585 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
586 domid, address, flags);
588 case EVENT_TYPE_DEV_TAB_ERR:
589 printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
590 "address=0x%016llx flags=0x%04x]\n",
591 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
594 case EVENT_TYPE_PAGE_TAB_ERR:
595 printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
596 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
597 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
598 domid, address, flags);
600 case EVENT_TYPE_ILL_CMD:
601 printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
602 dump_command(address);
604 case EVENT_TYPE_CMD_HARD_ERR:
605 printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
606 "flags=0x%04x]\n", address, flags);
608 case EVENT_TYPE_IOTLB_INV_TO:
609 printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
610 "address=0x%016llx]\n",
611 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
614 case EVENT_TYPE_INV_DEV_REQ:
615 printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x "
616 "address=0x%016llx flags=0x%04x]\n",
617 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
621 printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
624 memset(__evt, 0, 4 * sizeof(u32));
627 static void iommu_poll_events(struct amd_iommu *iommu)
631 head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
632 tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
634 while (head != tail) {
635 iommu_print_event(iommu, iommu->evt_buf + head);
636 head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
639 writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
642 static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
644 struct amd_iommu_fault fault;
646 INC_STATS_COUNTER(pri_requests);
648 if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
649 pr_err_ratelimited("AMD-Vi: Unknown PPR request received\n");
653 fault.address = raw[1];
654 fault.pasid = PPR_PASID(raw[0]);
655 fault.device_id = PPR_DEVID(raw[0]);
656 fault.tag = PPR_TAG(raw[0]);
657 fault.flags = PPR_FLAGS(raw[0]);
659 atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
662 static void iommu_poll_ppr_log(struct amd_iommu *iommu)
666 if (iommu->ppr_log == NULL)
669 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
670 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
672 while (head != tail) {
677 raw = (u64 *)(iommu->ppr_log + head);
680 * Hardware bug: Interrupt may arrive before the entry is
681 * written to memory. If this happens we need to wait for the
684 for (i = 0; i < LOOP_TIMEOUT; ++i) {
685 if (PPR_REQ_TYPE(raw[0]) != 0)
690 /* Avoid memcpy function-call overhead */
695 * To detect the hardware bug we need to clear the entry
698 raw[0] = raw[1] = 0UL;
700 /* Update head pointer of hardware ring-buffer */
701 head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
702 writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
704 /* Handle PPR entry */
705 iommu_handle_ppr_entry(iommu, entry);
707 /* Refresh ring-buffer information */
708 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
709 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
713 irqreturn_t amd_iommu_int_thread(int irq, void *data)
715 struct amd_iommu *iommu = (struct amd_iommu *) data;
716 u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
718 while (status & (MMIO_STATUS_EVT_INT_MASK | MMIO_STATUS_PPR_INT_MASK)) {
719 /* Enable EVT and PPR interrupts again */
720 writel((MMIO_STATUS_EVT_INT_MASK | MMIO_STATUS_PPR_INT_MASK),
721 iommu->mmio_base + MMIO_STATUS_OFFSET);
723 if (status & MMIO_STATUS_EVT_INT_MASK) {
724 pr_devel("AMD-Vi: Processing IOMMU Event Log\n");
725 iommu_poll_events(iommu);
728 if (status & MMIO_STATUS_PPR_INT_MASK) {
729 pr_devel("AMD-Vi: Processing IOMMU PPR Log\n");
730 iommu_poll_ppr_log(iommu);
734 * Hardware bug: ERBT1312
735 * When re-enabling interrupt (by writing 1
736 * to clear the bit), the hardware might also try to set
737 * the interrupt bit in the event status register.
738 * In this scenario, the bit will be set, and disable
739 * subsequent interrupts.
741 * Workaround: The IOMMU driver should read back the
742 * status register and check if the interrupt bits are cleared.
743 * If not, driver will need to go through the interrupt handler
744 * again and re-clear the bits
746 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
751 irqreturn_t amd_iommu_int_handler(int irq, void *data)
753 return IRQ_WAKE_THREAD;
756 /****************************************************************************
758 * IOMMU command queuing functions
760 ****************************************************************************/
762 static int wait_on_sem(volatile u64 *sem)
766 while (*sem == 0 && i < LOOP_TIMEOUT) {
771 if (i == LOOP_TIMEOUT) {
772 pr_alert("AMD-Vi: Completion-Wait loop timed out\n");
779 static void copy_cmd_to_buffer(struct amd_iommu *iommu,
780 struct iommu_cmd *cmd,
785 target = iommu->cmd_buf + tail;
786 tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
788 /* Copy command to buffer */
789 memcpy(target, cmd, sizeof(*cmd));
791 /* Tell the IOMMU about it */
792 writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
795 static void build_completion_wait(struct iommu_cmd *cmd, u64 address)
797 WARN_ON(address & 0x7ULL);
799 memset(cmd, 0, sizeof(*cmd));
800 cmd->data[0] = lower_32_bits(__pa(address)) | CMD_COMPL_WAIT_STORE_MASK;
801 cmd->data[1] = upper_32_bits(__pa(address));
803 CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
806 static void build_inv_dte(struct iommu_cmd *cmd, u16 devid)
808 memset(cmd, 0, sizeof(*cmd));
809 cmd->data[0] = devid;
810 CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY);
813 static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
814 size_t size, u16 domid, int pde)
819 pages = iommu_num_pages(address, size, PAGE_SIZE);
824 * If we have to flush more than one page, flush all
825 * TLB entries for this domain
827 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
831 address &= PAGE_MASK;
833 memset(cmd, 0, sizeof(*cmd));
834 cmd->data[1] |= domid;
835 cmd->data[2] = lower_32_bits(address);
836 cmd->data[3] = upper_32_bits(address);
837 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
838 if (s) /* size bit - we flush more than one 4kb page */
839 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
840 if (pde) /* PDE bit - we want to flush everything, not only the PTEs */
841 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
844 static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep,
845 u64 address, size_t size)
850 pages = iommu_num_pages(address, size, PAGE_SIZE);
855 * If we have to flush more than one page, flush all
856 * TLB entries for this domain
858 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
862 address &= PAGE_MASK;
864 memset(cmd, 0, sizeof(*cmd));
865 cmd->data[0] = devid;
866 cmd->data[0] |= (qdep & 0xff) << 24;
867 cmd->data[1] = devid;
868 cmd->data[2] = lower_32_bits(address);
869 cmd->data[3] = upper_32_bits(address);
870 CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
872 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
875 static void build_inv_iommu_pasid(struct iommu_cmd *cmd, u16 domid, int pasid,
876 u64 address, bool size)
878 memset(cmd, 0, sizeof(*cmd));
880 address &= ~(0xfffULL);
882 cmd->data[0] = pasid;
883 cmd->data[1] = domid;
884 cmd->data[2] = lower_32_bits(address);
885 cmd->data[3] = upper_32_bits(address);
886 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
887 cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
889 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
890 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
893 static void build_inv_iotlb_pasid(struct iommu_cmd *cmd, u16 devid, int pasid,
894 int qdep, u64 address, bool size)
896 memset(cmd, 0, sizeof(*cmd));
898 address &= ~(0xfffULL);
900 cmd->data[0] = devid;
901 cmd->data[0] |= ((pasid >> 8) & 0xff) << 16;
902 cmd->data[0] |= (qdep & 0xff) << 24;
903 cmd->data[1] = devid;
904 cmd->data[1] |= (pasid & 0xff) << 16;
905 cmd->data[2] = lower_32_bits(address);
906 cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
907 cmd->data[3] = upper_32_bits(address);
909 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
910 CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
913 static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, int pasid,
914 int status, int tag, bool gn)
916 memset(cmd, 0, sizeof(*cmd));
918 cmd->data[0] = devid;
920 cmd->data[1] = pasid;
921 cmd->data[2] = CMD_INV_IOMMU_PAGES_GN_MASK;
923 cmd->data[3] = tag & 0x1ff;
924 cmd->data[3] |= (status & PPR_STATUS_MASK) << PPR_STATUS_SHIFT;
926 CMD_SET_TYPE(cmd, CMD_COMPLETE_PPR);
929 static void build_inv_all(struct iommu_cmd *cmd)
931 memset(cmd, 0, sizeof(*cmd));
932 CMD_SET_TYPE(cmd, CMD_INV_ALL);
935 static void build_inv_irt(struct iommu_cmd *cmd, u16 devid)
937 memset(cmd, 0, sizeof(*cmd));
938 cmd->data[0] = devid;
939 CMD_SET_TYPE(cmd, CMD_INV_IRT);
943 * Writes the command to the IOMMUs command buffer and informs the
944 * hardware about the new command.
946 static int iommu_queue_command_sync(struct amd_iommu *iommu,
947 struct iommu_cmd *cmd,
950 u32 left, tail, head, next_tail;
953 WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED);
956 spin_lock_irqsave(&iommu->lock, flags);
958 head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
959 tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
960 next_tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
961 left = (head - next_tail) % iommu->cmd_buf_size;
964 struct iommu_cmd sync_cmd;
965 volatile u64 sem = 0;
968 build_completion_wait(&sync_cmd, (u64)&sem);
969 copy_cmd_to_buffer(iommu, &sync_cmd, tail);
971 spin_unlock_irqrestore(&iommu->lock, flags);
973 if ((ret = wait_on_sem(&sem)) != 0)
979 copy_cmd_to_buffer(iommu, cmd, tail);
981 /* We need to sync now to make sure all commands are processed */
982 iommu->need_sync = sync;
984 spin_unlock_irqrestore(&iommu->lock, flags);
989 static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
991 return iommu_queue_command_sync(iommu, cmd, true);
995 * This function queues a completion wait command into the command
998 static int iommu_completion_wait(struct amd_iommu *iommu)
1000 struct iommu_cmd cmd;
1001 volatile u64 sem = 0;
1004 if (!iommu->need_sync)
1007 build_completion_wait(&cmd, (u64)&sem);
1009 ret = iommu_queue_command_sync(iommu, &cmd, false);
1013 return wait_on_sem(&sem);
1016 static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
1018 struct iommu_cmd cmd;
1020 build_inv_dte(&cmd, devid);
1022 return iommu_queue_command(iommu, &cmd);
1025 static void iommu_flush_dte_all(struct amd_iommu *iommu)
1029 for (devid = 0; devid <= 0xffff; ++devid)
1030 iommu_flush_dte(iommu, devid);
1032 iommu_completion_wait(iommu);
1036 * This function uses heavy locking and may disable irqs for some time. But
1037 * this is no issue because it is only called during resume.
1039 static void iommu_flush_tlb_all(struct amd_iommu *iommu)
1043 for (dom_id = 0; dom_id <= 0xffff; ++dom_id) {
1044 struct iommu_cmd cmd;
1045 build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
1047 iommu_queue_command(iommu, &cmd);
1050 iommu_completion_wait(iommu);
1053 static void iommu_flush_all(struct amd_iommu *iommu)
1055 struct iommu_cmd cmd;
1057 build_inv_all(&cmd);
1059 iommu_queue_command(iommu, &cmd);
1060 iommu_completion_wait(iommu);
1063 static void iommu_flush_irt(struct amd_iommu *iommu, u16 devid)
1065 struct iommu_cmd cmd;
1067 build_inv_irt(&cmd, devid);
1069 iommu_queue_command(iommu, &cmd);
1072 static void iommu_flush_irt_all(struct amd_iommu *iommu)
1076 for (devid = 0; devid <= MAX_DEV_TABLE_ENTRIES; devid++)
1077 iommu_flush_irt(iommu, devid);
1079 iommu_completion_wait(iommu);
1082 void iommu_flush_all_caches(struct amd_iommu *iommu)
1084 if (iommu_feature(iommu, FEATURE_IA)) {
1085 iommu_flush_all(iommu);
1087 iommu_flush_dte_all(iommu);
1088 iommu_flush_irt_all(iommu);
1089 iommu_flush_tlb_all(iommu);
1094 * Command send function for flushing on-device TLB
1096 static int device_flush_iotlb(struct iommu_dev_data *dev_data,
1097 u64 address, size_t size)
1099 struct amd_iommu *iommu;
1100 struct iommu_cmd cmd;
1103 qdep = dev_data->ats.qdep;
1104 iommu = amd_iommu_rlookup_table[dev_data->devid];
1106 build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size);
1108 return iommu_queue_command(iommu, &cmd);
1112 * Command send function for invalidating a device table entry
1114 static int device_flush_dte(struct iommu_dev_data *dev_data)
1116 struct amd_iommu *iommu;
1120 iommu = amd_iommu_rlookup_table[dev_data->devid];
1121 alias = amd_iommu_alias_table[dev_data->devid];
1123 ret = iommu_flush_dte(iommu, dev_data->devid);
1124 if (!ret && alias != dev_data->devid)
1125 ret = iommu_flush_dte(iommu, alias);
1129 if (dev_data->ats.enabled)
1130 ret = device_flush_iotlb(dev_data, 0, ~0UL);
1136 * TLB invalidation function which is called from the mapping functions.
1137 * It invalidates a single PTE if the range to flush is within a single
1138 * page. Otherwise it flushes the whole TLB of the IOMMU.
1140 static void __domain_flush_pages(struct protection_domain *domain,
1141 u64 address, size_t size, int pde)
1143 struct iommu_dev_data *dev_data;
1144 struct iommu_cmd cmd;
1147 build_inv_iommu_pages(&cmd, address, size, domain->id, pde);
1149 for (i = 0; i < amd_iommus_present; ++i) {
1150 if (!domain->dev_iommu[i])
1154 * Devices of this domain are behind this IOMMU
1155 * We need a TLB flush
1157 ret |= iommu_queue_command(amd_iommus[i], &cmd);
1160 list_for_each_entry(dev_data, &domain->dev_list, list) {
1162 if (!dev_data->ats.enabled)
1165 ret |= device_flush_iotlb(dev_data, address, size);
1171 static void domain_flush_pages(struct protection_domain *domain,
1172 u64 address, size_t size)
1174 __domain_flush_pages(domain, address, size, 0);
1177 /* Flush the whole IO/TLB for a given protection domain */
1178 static void domain_flush_tlb(struct protection_domain *domain)
1180 __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0);
1183 /* Flush the whole IO/TLB for a given protection domain - including PDE */
1184 static void domain_flush_tlb_pde(struct protection_domain *domain)
1186 __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
1189 static void domain_flush_complete(struct protection_domain *domain)
1193 for (i = 0; i < amd_iommus_present; ++i) {
1194 if (!domain->dev_iommu[i])
1198 * Devices of this domain are behind this IOMMU
1199 * We need to wait for completion of all commands.
1201 iommu_completion_wait(amd_iommus[i]);
1207 * This function flushes the DTEs for all devices in domain
1209 static void domain_flush_devices(struct protection_domain *domain)
1211 struct iommu_dev_data *dev_data;
1213 list_for_each_entry(dev_data, &domain->dev_list, list)
1214 device_flush_dte(dev_data);
1217 /****************************************************************************
1219 * The functions below are used the create the page table mappings for
1220 * unity mapped regions.
1222 ****************************************************************************/
1225 * This function is used to add another level to an IO page table. Adding
1226 * another level increases the size of the address space by 9 bits to a size up
1229 static bool increase_address_space(struct protection_domain *domain,
1234 if (domain->mode == PAGE_MODE_6_LEVEL)
1235 /* address space already 64 bit large */
1238 pte = (void *)get_zeroed_page(gfp);
1242 *pte = PM_LEVEL_PDE(domain->mode,
1243 virt_to_phys(domain->pt_root));
1244 domain->pt_root = pte;
1246 domain->updated = true;
1251 static u64 *alloc_pte(struct protection_domain *domain,
1252 unsigned long address,
1253 unsigned long page_size,
1260 BUG_ON(!is_power_of_2(page_size));
1262 while (address > PM_LEVEL_SIZE(domain->mode))
1263 increase_address_space(domain, gfp);
1265 level = domain->mode - 1;
1266 pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
1267 address = PAGE_SIZE_ALIGN(address, page_size);
1268 end_lvl = PAGE_SIZE_LEVEL(page_size);
1270 while (level > end_lvl) {
1271 if (!IOMMU_PTE_PRESENT(*pte)) {
1272 page = (u64 *)get_zeroed_page(gfp);
1275 *pte = PM_LEVEL_PDE(level, virt_to_phys(page));
1278 /* No level skipping support yet */
1279 if (PM_PTE_LEVEL(*pte) != level)
1284 pte = IOMMU_PTE_PAGE(*pte);
1286 if (pte_page && level == end_lvl)
1289 pte = &pte[PM_LEVEL_INDEX(level, address)];
1296 * This function checks if there is a PTE for a given dma address. If
1297 * there is one, it returns the pointer to it.
1299 static u64 *fetch_pte(struct protection_domain *domain,
1300 unsigned long address,
1301 unsigned long *page_size)
1306 if (address > PM_LEVEL_SIZE(domain->mode))
1309 level = domain->mode - 1;
1310 pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
1311 *page_size = PTE_LEVEL_PAGE_SIZE(level);
1316 if (!IOMMU_PTE_PRESENT(*pte))
1320 if (PM_PTE_LEVEL(*pte) == 7 ||
1321 PM_PTE_LEVEL(*pte) == 0)
1324 /* No level skipping support yet */
1325 if (PM_PTE_LEVEL(*pte) != level)
1330 /* Walk to the next level */
1331 pte = IOMMU_PTE_PAGE(*pte);
1332 pte = &pte[PM_LEVEL_INDEX(level, address)];
1333 *page_size = PTE_LEVEL_PAGE_SIZE(level);
1336 if (PM_PTE_LEVEL(*pte) == 0x07) {
1337 unsigned long pte_mask;
1340 * If we have a series of large PTEs, make
1341 * sure to return a pointer to the first one.
1343 *page_size = pte_mask = PTE_PAGE_SIZE(*pte);
1344 pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1);
1345 pte = (u64 *)(((unsigned long)pte) & pte_mask);
1352 * Generic mapping functions. It maps a physical address into a DMA
1353 * address space. It allocates the page table pages if necessary.
1354 * In the future it can be extended to a generic mapping function
1355 * supporting all features of AMD IOMMU page tables like level skipping
1356 * and full 64 bit address spaces.
1358 static int iommu_map_page(struct protection_domain *dom,
1359 unsigned long bus_addr,
1360 unsigned long phys_addr,
1362 unsigned long page_size)
1367 BUG_ON(!IS_ALIGNED(bus_addr, page_size));
1368 BUG_ON(!IS_ALIGNED(phys_addr, page_size));
1370 if (!(prot & IOMMU_PROT_MASK))
1373 count = PAGE_SIZE_PTE_COUNT(page_size);
1374 pte = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL);
1379 for (i = 0; i < count; ++i)
1380 if (IOMMU_PTE_PRESENT(pte[i]))
1384 __pte = PAGE_SIZE_PTE(phys_addr, page_size);
1385 __pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_P | IOMMU_PTE_FC;
1387 __pte = phys_addr | IOMMU_PTE_P | IOMMU_PTE_FC;
1389 if (prot & IOMMU_PROT_IR)
1390 __pte |= IOMMU_PTE_IR;
1391 if (prot & IOMMU_PROT_IW)
1392 __pte |= IOMMU_PTE_IW;
1394 for (i = 0; i < count; ++i)
1402 static unsigned long iommu_unmap_page(struct protection_domain *dom,
1403 unsigned long bus_addr,
1404 unsigned long page_size)
1406 unsigned long long unmapped;
1407 unsigned long unmap_size;
1410 BUG_ON(!is_power_of_2(page_size));
1414 while (unmapped < page_size) {
1416 pte = fetch_pte(dom, bus_addr, &unmap_size);
1421 count = PAGE_SIZE_PTE_COUNT(unmap_size);
1422 for (i = 0; i < count; i++)
1426 bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size;
1427 unmapped += unmap_size;
1430 BUG_ON(unmapped && !is_power_of_2(unmapped));
1435 /****************************************************************************
1437 * The next functions belong to the address allocator for the dma_ops
1438 * interface functions. They work like the allocators in the other IOMMU
1439 * drivers. Its basically a bitmap which marks the allocated pages in
1440 * the aperture. Maybe it could be enhanced in the future to a more
1441 * efficient allocator.
1443 ****************************************************************************/
1446 * The address allocator core functions.
1448 * called with domain->lock held
1452 * Used to reserve address ranges in the aperture (e.g. for exclusion
1455 static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
1456 unsigned long start_page,
1459 unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT;
1461 if (start_page + pages > last_page)
1462 pages = last_page - start_page;
1464 for (i = start_page; i < start_page + pages; ++i) {
1465 int index = i / APERTURE_RANGE_PAGES;
1466 int page = i % APERTURE_RANGE_PAGES;
1467 __set_bit(page, dom->aperture[index]->bitmap);
1472 * This function is used to add a new aperture range to an existing
1473 * aperture in case of dma_ops domain allocation or address allocation
1476 static int alloc_new_range(struct dma_ops_domain *dma_dom,
1477 bool populate, gfp_t gfp)
1479 int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT;
1480 struct amd_iommu *iommu;
1481 unsigned long i, old_size, pte_pgsize;
1483 #ifdef CONFIG_IOMMU_STRESS
1487 if (index >= APERTURE_MAX_RANGES)
1490 dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp);
1491 if (!dma_dom->aperture[index])
1494 dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp);
1495 if (!dma_dom->aperture[index]->bitmap)
1498 dma_dom->aperture[index]->offset = dma_dom->aperture_size;
1501 unsigned long address = dma_dom->aperture_size;
1502 int i, num_ptes = APERTURE_RANGE_PAGES / 512;
1503 u64 *pte, *pte_page;
1505 for (i = 0; i < num_ptes; ++i) {
1506 pte = alloc_pte(&dma_dom->domain, address, PAGE_SIZE,
1511 dma_dom->aperture[index]->pte_pages[i] = pte_page;
1513 address += APERTURE_RANGE_SIZE / 64;
1517 old_size = dma_dom->aperture_size;
1518 dma_dom->aperture_size += APERTURE_RANGE_SIZE;
1520 /* Reserve address range used for MSI messages */
1521 if (old_size < MSI_ADDR_BASE_LO &&
1522 dma_dom->aperture_size > MSI_ADDR_BASE_LO) {
1523 unsigned long spage;
1526 pages = iommu_num_pages(MSI_ADDR_BASE_LO, 0x10000, PAGE_SIZE);
1527 spage = MSI_ADDR_BASE_LO >> PAGE_SHIFT;
1529 dma_ops_reserve_addresses(dma_dom, spage, pages);
1532 /* Initialize the exclusion range if necessary */
1533 for_each_iommu(iommu) {
1534 if (iommu->exclusion_start &&
1535 iommu->exclusion_start >= dma_dom->aperture[index]->offset
1536 && iommu->exclusion_start < dma_dom->aperture_size) {
1537 unsigned long startpage;
1538 int pages = iommu_num_pages(iommu->exclusion_start,
1539 iommu->exclusion_length,
1541 startpage = iommu->exclusion_start >> PAGE_SHIFT;
1542 dma_ops_reserve_addresses(dma_dom, startpage, pages);
1547 * Check for areas already mapped as present in the new aperture
1548 * range and mark those pages as reserved in the allocator. Such
1549 * mappings may already exist as a result of requested unity
1550 * mappings for devices.
1552 for (i = dma_dom->aperture[index]->offset;
1553 i < dma_dom->aperture_size;
1555 u64 *pte = fetch_pte(&dma_dom->domain, i, &pte_pgsize);
1556 if (!pte || !IOMMU_PTE_PRESENT(*pte))
1559 dma_ops_reserve_addresses(dma_dom, i >> PAGE_SHIFT,
1563 update_domain(&dma_dom->domain);
1568 update_domain(&dma_dom->domain);
1570 free_page((unsigned long)dma_dom->aperture[index]->bitmap);
1572 kfree(dma_dom->aperture[index]);
1573 dma_dom->aperture[index] = NULL;
1578 static unsigned long dma_ops_area_alloc(struct device *dev,
1579 struct dma_ops_domain *dom,
1581 unsigned long align_mask,
1583 unsigned long start)
1585 unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
1586 int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
1587 int i = start >> APERTURE_RANGE_SHIFT;
1588 unsigned long boundary_size, mask;
1589 unsigned long address = -1;
1590 unsigned long limit;
1592 next_bit >>= PAGE_SHIFT;
1594 mask = dma_get_seg_boundary(dev);
1596 boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT :
1597 1UL << (BITS_PER_LONG - PAGE_SHIFT);
1599 for (;i < max_index; ++i) {
1600 unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT;
1602 if (dom->aperture[i]->offset >= dma_mask)
1605 limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset,
1606 dma_mask >> PAGE_SHIFT);
1608 address = iommu_area_alloc(dom->aperture[i]->bitmap,
1609 limit, next_bit, pages, 0,
1610 boundary_size, align_mask);
1611 if (address != -1) {
1612 address = dom->aperture[i]->offset +
1613 (address << PAGE_SHIFT);
1614 dom->next_address = address + (pages << PAGE_SHIFT);
1624 static unsigned long dma_ops_alloc_addresses(struct device *dev,
1625 struct dma_ops_domain *dom,
1627 unsigned long align_mask,
1630 unsigned long address;
1632 #ifdef CONFIG_IOMMU_STRESS
1633 dom->next_address = 0;
1634 dom->need_flush = true;
1637 address = dma_ops_area_alloc(dev, dom, pages, align_mask,
1638 dma_mask, dom->next_address);
1640 if (address == -1) {
1641 dom->next_address = 0;
1642 address = dma_ops_area_alloc(dev, dom, pages, align_mask,
1644 dom->need_flush = true;
1647 if (unlikely(address == -1))
1648 address = DMA_ERROR_CODE;
1650 WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);
1656 * The address free function.
1658 * called with domain->lock held
1660 static void dma_ops_free_addresses(struct dma_ops_domain *dom,
1661 unsigned long address,
1664 unsigned i = address >> APERTURE_RANGE_SHIFT;
1665 struct aperture_range *range = dom->aperture[i];
1667 BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
1669 #ifdef CONFIG_IOMMU_STRESS
1674 if (address >= dom->next_address)
1675 dom->need_flush = true;
1677 address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;
1679 bitmap_clear(range->bitmap, address, pages);
1683 /****************************************************************************
1685 * The next functions belong to the domain allocation. A domain is
1686 * allocated for every IOMMU as the default domain. If device isolation
1687 * is enabled, every device get its own domain. The most important thing
1688 * about domains is the page table mapping the DMA address space they
1691 ****************************************************************************/
1694 * This function adds a protection domain to the global protection domain list
1696 static void add_domain_to_list(struct protection_domain *domain)
1698 unsigned long flags;
1700 spin_lock_irqsave(&amd_iommu_pd_lock, flags);
1701 list_add(&domain->list, &amd_iommu_pd_list);
1702 spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
1706 * This function removes a protection domain to the global
1707 * protection domain list
1709 static void del_domain_from_list(struct protection_domain *domain)
1711 unsigned long flags;
1713 spin_lock_irqsave(&amd_iommu_pd_lock, flags);
1714 list_del(&domain->list);
1715 spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
1718 static u16 domain_id_alloc(void)
1720 unsigned long flags;
1723 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1724 id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
1726 if (id > 0 && id < MAX_DOMAIN_ID)
1727 __set_bit(id, amd_iommu_pd_alloc_bitmap);
1730 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1735 static void domain_id_free(int id)
1737 unsigned long flags;
1739 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1740 if (id > 0 && id < MAX_DOMAIN_ID)
1741 __clear_bit(id, amd_iommu_pd_alloc_bitmap);
1742 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1745 #define DEFINE_FREE_PT_FN(LVL, FN) \
1746 static void free_pt_##LVL (unsigned long __pt) \
1754 for (i = 0; i < 512; ++i) { \
1755 /* PTE present? */ \
1756 if (!IOMMU_PTE_PRESENT(pt[i])) \
1760 if (PM_PTE_LEVEL(pt[i]) == 0 || \
1761 PM_PTE_LEVEL(pt[i]) == 7) \
1764 p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \
1767 free_page((unsigned long)pt); \
1770 DEFINE_FREE_PT_FN(l2, free_page)
1771 DEFINE_FREE_PT_FN(l3, free_pt_l2)
1772 DEFINE_FREE_PT_FN(l4, free_pt_l3)
1773 DEFINE_FREE_PT_FN(l5, free_pt_l4)
1774 DEFINE_FREE_PT_FN(l6, free_pt_l5)
1776 static void free_pagetable(struct protection_domain *domain)
1778 unsigned long root = (unsigned long)domain->pt_root;
1780 switch (domain->mode) {
1781 case PAGE_MODE_NONE:
1783 case PAGE_MODE_1_LEVEL:
1786 case PAGE_MODE_2_LEVEL:
1789 case PAGE_MODE_3_LEVEL:
1792 case PAGE_MODE_4_LEVEL:
1795 case PAGE_MODE_5_LEVEL:
1798 case PAGE_MODE_6_LEVEL:
1806 static void free_gcr3_tbl_level1(u64 *tbl)
1811 for (i = 0; i < 512; ++i) {
1812 if (!(tbl[i] & GCR3_VALID))
1815 ptr = __va(tbl[i] & PAGE_MASK);
1817 free_page((unsigned long)ptr);
1821 static void free_gcr3_tbl_level2(u64 *tbl)
1826 for (i = 0; i < 512; ++i) {
1827 if (!(tbl[i] & GCR3_VALID))
1830 ptr = __va(tbl[i] & PAGE_MASK);
1832 free_gcr3_tbl_level1(ptr);
1836 static void free_gcr3_table(struct protection_domain *domain)
1838 if (domain->glx == 2)
1839 free_gcr3_tbl_level2(domain->gcr3_tbl);
1840 else if (domain->glx == 1)
1841 free_gcr3_tbl_level1(domain->gcr3_tbl);
1843 BUG_ON(domain->glx != 0);
1845 free_page((unsigned long)domain->gcr3_tbl);
1849 * Free a domain, only used if something went wrong in the
1850 * allocation path and we need to free an already allocated page table
1852 static void dma_ops_domain_free(struct dma_ops_domain *dom)
1859 del_domain_from_list(&dom->domain);
1861 free_pagetable(&dom->domain);
1863 for (i = 0; i < APERTURE_MAX_RANGES; ++i) {
1864 if (!dom->aperture[i])
1866 free_page((unsigned long)dom->aperture[i]->bitmap);
1867 kfree(dom->aperture[i]);
1874 * Allocates a new protection domain usable for the dma_ops functions.
1875 * It also initializes the page table and the address allocator data
1876 * structures required for the dma_ops interface
1878 static struct dma_ops_domain *dma_ops_domain_alloc(void)
1880 struct dma_ops_domain *dma_dom;
1882 dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
1886 if (protection_domain_init(&dma_dom->domain))
1889 dma_dom->domain.mode = PAGE_MODE_2_LEVEL;
1890 dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
1891 dma_dom->domain.flags = PD_DMA_OPS_MASK;
1892 dma_dom->domain.priv = dma_dom;
1893 if (!dma_dom->domain.pt_root)
1896 dma_dom->need_flush = false;
1898 add_domain_to_list(&dma_dom->domain);
1900 if (alloc_new_range(dma_dom, true, GFP_KERNEL))
1904 * mark the first page as allocated so we never return 0 as
1905 * a valid dma-address. So we can use 0 as error value
1907 dma_dom->aperture[0]->bitmap[0] = 1;
1908 dma_dom->next_address = 0;
1914 dma_ops_domain_free(dma_dom);
1920 * little helper function to check whether a given protection domain is a
1923 static bool dma_ops_domain(struct protection_domain *domain)
1925 return domain->flags & PD_DMA_OPS_MASK;
1928 static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
1933 if (domain->mode != PAGE_MODE_NONE)
1934 pte_root = virt_to_phys(domain->pt_root);
1936 pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
1937 << DEV_ENTRY_MODE_SHIFT;
1938 pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
1940 flags = amd_iommu_dev_table[devid].data[1];
1943 flags |= DTE_FLAG_IOTLB;
1945 if (domain->flags & PD_IOMMUV2_MASK) {
1946 u64 gcr3 = __pa(domain->gcr3_tbl);
1947 u64 glx = domain->glx;
1950 pte_root |= DTE_FLAG_GV;
1951 pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT;
1953 /* First mask out possible old values for GCR3 table */
1954 tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
1957 tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
1960 /* Encode GCR3 table into DTE */
1961 tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A;
1964 tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B;
1967 tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C;
1971 flags &= ~(0xffffUL);
1972 flags |= domain->id;
1974 amd_iommu_dev_table[devid].data[1] = flags;
1975 amd_iommu_dev_table[devid].data[0] = pte_root;
1978 static void clear_dte_entry(u16 devid)
1980 /* remove entry from the device table seen by the hardware */
1981 amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
1982 amd_iommu_dev_table[devid].data[1] = 0;
1984 amd_iommu_apply_erratum_63(devid);
1987 static void do_attach(struct iommu_dev_data *dev_data,
1988 struct protection_domain *domain)
1990 struct amd_iommu *iommu;
1994 iommu = amd_iommu_rlookup_table[dev_data->devid];
1995 alias = amd_iommu_alias_table[dev_data->devid];
1996 ats = dev_data->ats.enabled;
1998 /* Update data structures */
1999 dev_data->domain = domain;
2000 list_add(&dev_data->list, &domain->dev_list);
2002 /* Do reference counting */
2003 domain->dev_iommu[iommu->index] += 1;
2004 domain->dev_cnt += 1;
2006 /* Update device table */
2007 set_dte_entry(dev_data->devid, domain, ats);
2008 if (alias != dev_data->devid)
2009 set_dte_entry(dev_data->devid, domain, ats);
2011 device_flush_dte(dev_data);
2014 static void do_detach(struct iommu_dev_data *dev_data)
2016 struct amd_iommu *iommu;
2019 iommu = amd_iommu_rlookup_table[dev_data->devid];
2020 alias = amd_iommu_alias_table[dev_data->devid];
2022 /* decrease reference counters */
2023 dev_data->domain->dev_iommu[iommu->index] -= 1;
2024 dev_data->domain->dev_cnt -= 1;
2026 /* Update data structures */
2027 dev_data->domain = NULL;
2028 list_del(&dev_data->list);
2029 clear_dte_entry(dev_data->devid);
2030 if (alias != dev_data->devid)
2031 clear_dte_entry(alias);
2033 /* Flush the DTE entry */
2034 device_flush_dte(dev_data);
2038 * If a device is not yet associated with a domain, this function does
2039 * assigns it visible for the hardware
2041 static int __attach_device(struct iommu_dev_data *dev_data,
2042 struct protection_domain *domain)
2047 * Must be called with IRQs disabled. Warn here to detect early
2050 WARN_ON(!irqs_disabled());
2053 spin_lock(&domain->lock);
2056 if (dev_data->domain != NULL)
2059 /* Attach alias group root */
2060 do_attach(dev_data, domain);
2067 spin_unlock(&domain->lock);
2073 static void pdev_iommuv2_disable(struct pci_dev *pdev)
2075 pci_disable_ats(pdev);
2076 pci_disable_pri(pdev);
2077 pci_disable_pasid(pdev);
2080 /* FIXME: Change generic reset-function to do the same */
2081 static int pri_reset_while_enabled(struct pci_dev *pdev)
2086 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
2090 pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
2091 control |= PCI_PRI_CTRL_RESET;
2092 pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
2097 static int pdev_iommuv2_enable(struct pci_dev *pdev)
2102 /* FIXME: Hardcode number of outstanding requests for now */
2104 if (pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE))
2106 reset_enable = pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_ENABLE_RESET);
2108 /* Only allow access to user-accessible pages */
2109 ret = pci_enable_pasid(pdev, 0);
2113 /* First reset the PRI state of the device */
2114 ret = pci_reset_pri(pdev);
2119 ret = pci_enable_pri(pdev, reqs);
2124 ret = pri_reset_while_enabled(pdev);
2129 ret = pci_enable_ats(pdev, PAGE_SHIFT);
2136 pci_disable_pri(pdev);
2137 pci_disable_pasid(pdev);
2142 /* FIXME: Move this to PCI code */
2143 #define PCI_PRI_TLP_OFF (1 << 15)
2145 static bool pci_pri_tlp_required(struct pci_dev *pdev)
2150 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
2154 pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
2156 return (status & PCI_PRI_TLP_OFF) ? true : false;
2160 * If a device is not yet associated with a domain, this function
2161 * assigns it visible for the hardware
2163 static int attach_device(struct device *dev,
2164 struct protection_domain *domain)
2166 struct pci_dev *pdev = to_pci_dev(dev);
2167 struct iommu_dev_data *dev_data;
2168 unsigned long flags;
2171 dev_data = get_dev_data(dev);
2173 if (domain->flags & PD_IOMMUV2_MASK) {
2174 if (!dev_data->passthrough)
2177 if (dev_data->iommu_v2) {
2178 if (pdev_iommuv2_enable(pdev) != 0)
2181 dev_data->ats.enabled = true;
2182 dev_data->ats.qdep = pci_ats_queue_depth(pdev);
2183 dev_data->pri_tlp = pci_pri_tlp_required(pdev);
2185 } else if (amd_iommu_iotlb_sup &&
2186 pci_enable_ats(pdev, PAGE_SHIFT) == 0) {
2187 dev_data->ats.enabled = true;
2188 dev_data->ats.qdep = pci_ats_queue_depth(pdev);
2191 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
2192 ret = __attach_device(dev_data, domain);
2193 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
2196 * We might boot into a crash-kernel here. The crashed kernel
2197 * left the caches in the IOMMU dirty. So we have to flush
2198 * here to evict all dirty stuff.
2200 domain_flush_tlb_pde(domain);
2206 * Removes a device from a protection domain (unlocked)
2208 static void __detach_device(struct iommu_dev_data *dev_data)
2210 struct protection_domain *domain;
2213 * Must be called with IRQs disabled. Warn here to detect early
2216 WARN_ON(!irqs_disabled());
2218 if (WARN_ON(!dev_data->domain))
2221 domain = dev_data->domain;
2223 spin_lock(&domain->lock);
2225 do_detach(dev_data);
2227 spin_unlock(&domain->lock);
2231 * Removes a device from a protection domain (with devtable_lock held)
2233 static void detach_device(struct device *dev)
2235 struct protection_domain *domain;
2236 struct iommu_dev_data *dev_data;
2237 unsigned long flags;
2239 dev_data = get_dev_data(dev);
2240 domain = dev_data->domain;
2242 /* lock device table */
2243 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
2244 __detach_device(dev_data);
2245 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
2247 if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2)
2248 pdev_iommuv2_disable(to_pci_dev(dev));
2249 else if (dev_data->ats.enabled)
2250 pci_disable_ats(to_pci_dev(dev));
2252 dev_data->ats.enabled = false;
2255 static int amd_iommu_add_device(struct device *dev)
2257 struct iommu_dev_data *dev_data;
2258 struct iommu_domain *domain;
2259 struct amd_iommu *iommu;
2263 if (!check_device(dev) || get_dev_data(dev))
2266 devid = get_device_id(dev);
2267 iommu = amd_iommu_rlookup_table[devid];
2269 ret = iommu_init_device(dev);
2271 if (ret != -ENOTSUPP)
2272 pr_err("Failed to initialize device %s - trying to proceed anyway\n",
2275 iommu_ignore_device(dev);
2276 dev->archdata.dma_ops = &nommu_dma_ops;
2279 init_iommu_group(dev);
2281 dev_data = get_dev_data(dev);
2285 if (iommu_pass_through || dev_data->iommu_v2)
2286 iommu_request_dm_for_dev(dev);
2288 /* Domains are initialized for this device - have a look what we ended up with */
2289 domain = iommu_get_domain_for_dev(dev);
2290 if (domain->type == IOMMU_DOMAIN_IDENTITY)
2291 dev_data->passthrough = true;
2293 dev->archdata.dma_ops = &amd_iommu_dma_ops;
2296 iommu_completion_wait(iommu);
2301 static void amd_iommu_remove_device(struct device *dev)
2303 struct amd_iommu *iommu;
2306 if (!check_device(dev))
2309 devid = get_device_id(dev);
2310 iommu = amd_iommu_rlookup_table[devid];
2312 iommu_uninit_device(dev);
2313 iommu_completion_wait(iommu);
2316 /*****************************************************************************
2318 * The next functions belong to the dma_ops mapping/unmapping code.
2320 *****************************************************************************/
2323 * In the dma_ops path we only have the struct device. This function
2324 * finds the corresponding IOMMU, the protection domain and the
2325 * requestor id for a given device.
2326 * If the device is not yet associated with a domain this is also done
2329 static struct protection_domain *get_domain(struct device *dev)
2331 struct protection_domain *domain;
2332 struct iommu_domain *io_domain;
2334 if (!check_device(dev))
2335 return ERR_PTR(-EINVAL);
2337 io_domain = iommu_get_domain_for_dev(dev);
2341 domain = to_pdomain(io_domain);
2342 if (!dma_ops_domain(domain))
2343 return ERR_PTR(-EBUSY);
2348 static void update_device_table(struct protection_domain *domain)
2350 struct iommu_dev_data *dev_data;
2352 list_for_each_entry(dev_data, &domain->dev_list, list)
2353 set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled);
2356 static void update_domain(struct protection_domain *domain)
2358 if (!domain->updated)
2361 update_device_table(domain);
2363 domain_flush_devices(domain);
2364 domain_flush_tlb_pde(domain);
2366 domain->updated = false;
2370 * This function fetches the PTE for a given address in the aperture
2372 static u64* dma_ops_get_pte(struct dma_ops_domain *dom,
2373 unsigned long address)
2375 struct aperture_range *aperture;
2376 u64 *pte, *pte_page;
2378 aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
2382 pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
2384 pte = alloc_pte(&dom->domain, address, PAGE_SIZE, &pte_page,
2386 aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page;
2388 pte += PM_LEVEL_INDEX(0, address);
2390 update_domain(&dom->domain);
2396 * This is the generic map function. It maps one 4kb page at paddr to
2397 * the given address in the DMA address space for the domain.
2399 static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom,
2400 unsigned long address,
2406 WARN_ON(address > dom->aperture_size);
2410 pte = dma_ops_get_pte(dom, address);
2412 return DMA_ERROR_CODE;
2414 __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
2416 if (direction == DMA_TO_DEVICE)
2417 __pte |= IOMMU_PTE_IR;
2418 else if (direction == DMA_FROM_DEVICE)
2419 __pte |= IOMMU_PTE_IW;
2420 else if (direction == DMA_BIDIRECTIONAL)
2421 __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
2427 return (dma_addr_t)address;
2431 * The generic unmapping function for on page in the DMA address space.
2433 static void dma_ops_domain_unmap(struct dma_ops_domain *dom,
2434 unsigned long address)
2436 struct aperture_range *aperture;
2439 if (address >= dom->aperture_size)
2442 aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
2446 pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
2450 pte += PM_LEVEL_INDEX(0, address);
2458 * This function contains common code for mapping of a physically
2459 * contiguous memory region into DMA address space. It is used by all
2460 * mapping functions provided with this IOMMU driver.
2461 * Must be called with the domain lock held.
2463 static dma_addr_t __map_single(struct device *dev,
2464 struct dma_ops_domain *dma_dom,
2471 dma_addr_t offset = paddr & ~PAGE_MASK;
2472 dma_addr_t address, start, ret;
2474 unsigned long align_mask = 0;
2477 pages = iommu_num_pages(paddr, size, PAGE_SIZE);
2480 INC_STATS_COUNTER(total_map_requests);
2483 INC_STATS_COUNTER(cross_page);
2486 align_mask = (1UL << get_order(size)) - 1;
2489 address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,
2491 if (unlikely(address == DMA_ERROR_CODE)) {
2493 * setting next_address here will let the address
2494 * allocator only scan the new allocated range in the
2495 * first run. This is a small optimization.
2497 dma_dom->next_address = dma_dom->aperture_size;
2499 if (alloc_new_range(dma_dom, false, GFP_ATOMIC))
2503 * aperture was successfully enlarged by 128 MB, try
2510 for (i = 0; i < pages; ++i) {
2511 ret = dma_ops_domain_map(dma_dom, start, paddr, dir);
2512 if (ret == DMA_ERROR_CODE)
2520 ADD_STATS_COUNTER(alloced_io_mem, size);
2522 if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
2523 domain_flush_tlb(&dma_dom->domain);
2524 dma_dom->need_flush = false;
2525 } else if (unlikely(amd_iommu_np_cache))
2526 domain_flush_pages(&dma_dom->domain, address, size);
2533 for (--i; i >= 0; --i) {
2535 dma_ops_domain_unmap(dma_dom, start);
2538 dma_ops_free_addresses(dma_dom, address, pages);
2540 return DMA_ERROR_CODE;
2544 * Does the reverse of the __map_single function. Must be called with
2545 * the domain lock held too
2547 static void __unmap_single(struct dma_ops_domain *dma_dom,
2548 dma_addr_t dma_addr,
2552 dma_addr_t flush_addr;
2553 dma_addr_t i, start;
2556 if ((dma_addr == DMA_ERROR_CODE) ||
2557 (dma_addr + size > dma_dom->aperture_size))
2560 flush_addr = dma_addr;
2561 pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
2562 dma_addr &= PAGE_MASK;
2565 for (i = 0; i < pages; ++i) {
2566 dma_ops_domain_unmap(dma_dom, start);
2570 SUB_STATS_COUNTER(alloced_io_mem, size);
2572 dma_ops_free_addresses(dma_dom, dma_addr, pages);
2574 if (amd_iommu_unmap_flush || dma_dom->need_flush) {
2575 domain_flush_pages(&dma_dom->domain, flush_addr, size);
2576 dma_dom->need_flush = false;
2581 * The exported map_single function for dma_ops.
2583 static dma_addr_t map_page(struct device *dev, struct page *page,
2584 unsigned long offset, size_t size,
2585 enum dma_data_direction dir,
2586 struct dma_attrs *attrs)
2588 unsigned long flags;
2589 struct protection_domain *domain;
2592 phys_addr_t paddr = page_to_phys(page) + offset;
2594 INC_STATS_COUNTER(cnt_map_single);
2596 domain = get_domain(dev);
2597 if (PTR_ERR(domain) == -EINVAL)
2598 return (dma_addr_t)paddr;
2599 else if (IS_ERR(domain))
2600 return DMA_ERROR_CODE;
2602 dma_mask = *dev->dma_mask;
2604 spin_lock_irqsave(&domain->lock, flags);
2606 addr = __map_single(dev, domain->priv, paddr, size, dir, false,
2608 if (addr == DMA_ERROR_CODE)
2611 domain_flush_complete(domain);
2614 spin_unlock_irqrestore(&domain->lock, flags);
2620 * The exported unmap_single function for dma_ops.
2622 static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
2623 enum dma_data_direction dir, struct dma_attrs *attrs)
2625 unsigned long flags;
2626 struct protection_domain *domain;
2628 INC_STATS_COUNTER(cnt_unmap_single);
2630 domain = get_domain(dev);
2634 spin_lock_irqsave(&domain->lock, flags);
2636 __unmap_single(domain->priv, dma_addr, size, dir);
2638 domain_flush_complete(domain);
2640 spin_unlock_irqrestore(&domain->lock, flags);
2644 * The exported map_sg function for dma_ops (handles scatter-gather
2647 static int map_sg(struct device *dev, struct scatterlist *sglist,
2648 int nelems, enum dma_data_direction dir,
2649 struct dma_attrs *attrs)
2651 unsigned long flags;
2652 struct protection_domain *domain;
2654 struct scatterlist *s;
2656 int mapped_elems = 0;
2659 INC_STATS_COUNTER(cnt_map_sg);
2661 domain = get_domain(dev);
2665 dma_mask = *dev->dma_mask;
2667 spin_lock_irqsave(&domain->lock, flags);
2669 for_each_sg(sglist, s, nelems, i) {
2672 s->dma_address = __map_single(dev, domain->priv,
2673 paddr, s->length, dir, false,
2676 if (s->dma_address) {
2677 s->dma_length = s->length;
2683 domain_flush_complete(domain);
2686 spin_unlock_irqrestore(&domain->lock, flags);
2688 return mapped_elems;
2690 for_each_sg(sglist, s, mapped_elems, i) {
2692 __unmap_single(domain->priv, s->dma_address,
2693 s->dma_length, dir);
2694 s->dma_address = s->dma_length = 0;
2703 * The exported map_sg function for dma_ops (handles scatter-gather
2706 static void unmap_sg(struct device *dev, struct scatterlist *sglist,
2707 int nelems, enum dma_data_direction dir,
2708 struct dma_attrs *attrs)
2710 unsigned long flags;
2711 struct protection_domain *domain;
2712 struct scatterlist *s;
2715 INC_STATS_COUNTER(cnt_unmap_sg);
2717 domain = get_domain(dev);
2721 spin_lock_irqsave(&domain->lock, flags);
2723 for_each_sg(sglist, s, nelems, i) {
2724 __unmap_single(domain->priv, s->dma_address,
2725 s->dma_length, dir);
2726 s->dma_address = s->dma_length = 0;
2729 domain_flush_complete(domain);
2731 spin_unlock_irqrestore(&domain->lock, flags);
2735 * The exported alloc_coherent function for dma_ops.
2737 static void *alloc_coherent(struct device *dev, size_t size,
2738 dma_addr_t *dma_addr, gfp_t flag,
2739 struct dma_attrs *attrs)
2741 u64 dma_mask = dev->coherent_dma_mask;
2742 struct protection_domain *domain;
2743 unsigned long flags;
2746 INC_STATS_COUNTER(cnt_alloc_coherent);
2748 domain = get_domain(dev);
2749 if (PTR_ERR(domain) == -EINVAL) {
2750 page = alloc_pages(flag, get_order(size));
2751 *dma_addr = page_to_phys(page);
2752 return page_address(page);
2753 } else if (IS_ERR(domain))
2756 size = PAGE_ALIGN(size);
2757 dma_mask = dev->coherent_dma_mask;
2758 flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
2761 page = alloc_pages(flag | __GFP_NOWARN, get_order(size));
2763 if (!(flag & __GFP_WAIT))
2766 page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
2773 dma_mask = *dev->dma_mask;
2775 spin_lock_irqsave(&domain->lock, flags);
2777 *dma_addr = __map_single(dev, domain->priv, page_to_phys(page),
2778 size, DMA_BIDIRECTIONAL, true, dma_mask);
2780 if (*dma_addr == DMA_ERROR_CODE) {
2781 spin_unlock_irqrestore(&domain->lock, flags);
2785 domain_flush_complete(domain);
2787 spin_unlock_irqrestore(&domain->lock, flags);
2789 return page_address(page);
2793 if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
2794 __free_pages(page, get_order(size));
2800 * The exported free_coherent function for dma_ops.
2802 static void free_coherent(struct device *dev, size_t size,
2803 void *virt_addr, dma_addr_t dma_addr,
2804 struct dma_attrs *attrs)
2806 struct protection_domain *domain;
2807 unsigned long flags;
2810 INC_STATS_COUNTER(cnt_free_coherent);
2812 page = virt_to_page(virt_addr);
2813 size = PAGE_ALIGN(size);
2815 domain = get_domain(dev);
2819 spin_lock_irqsave(&domain->lock, flags);
2821 __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
2823 domain_flush_complete(domain);
2825 spin_unlock_irqrestore(&domain->lock, flags);
2828 if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
2829 __free_pages(page, get_order(size));
2833 * This function is called by the DMA layer to find out if we can handle a
2834 * particular device. It is part of the dma_ops.
2836 static int amd_iommu_dma_supported(struct device *dev, u64 mask)
2838 return check_device(dev);
2841 static struct dma_map_ops amd_iommu_dma_ops = {
2842 .alloc = alloc_coherent,
2843 .free = free_coherent,
2844 .map_page = map_page,
2845 .unmap_page = unmap_page,
2847 .unmap_sg = unmap_sg,
2848 .dma_supported = amd_iommu_dma_supported,
2851 int __init amd_iommu_init_api(void)
2853 return bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
2856 int __init amd_iommu_init_dma_ops(void)
2858 swiotlb = iommu_pass_through ? 1 : 0;
2862 * In case we don't initialize SWIOTLB (actually the common case
2863 * when AMD IOMMU is enabled), make sure there are global
2864 * dma_ops set as a fall-back for devices not handled by this
2865 * driver (for example non-PCI devices).
2868 dma_ops = &nommu_dma_ops;
2870 amd_iommu_stats_init();
2872 if (amd_iommu_unmap_flush)
2873 pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n");
2875 pr_info("AMD-Vi: Lazy IO/TLB flushing enabled\n");
2880 /*****************************************************************************
2882 * The following functions belong to the exported interface of AMD IOMMU
2884 * This interface allows access to lower level functions of the IOMMU
2885 * like protection domain handling and assignement of devices to domains
2886 * which is not possible with the dma_ops interface.
2888 *****************************************************************************/
2890 static void cleanup_domain(struct protection_domain *domain)
2892 struct iommu_dev_data *entry;
2893 unsigned long flags;
2895 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
2897 while (!list_empty(&domain->dev_list)) {
2898 entry = list_first_entry(&domain->dev_list,
2899 struct iommu_dev_data, list);
2900 __detach_device(entry);
2903 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
2906 static void protection_domain_free(struct protection_domain *domain)
2911 del_domain_from_list(domain);
2914 domain_id_free(domain->id);
2919 static int protection_domain_init(struct protection_domain *domain)
2921 spin_lock_init(&domain->lock);
2922 mutex_init(&domain->api_lock);
2923 domain->id = domain_id_alloc();
2926 INIT_LIST_HEAD(&domain->dev_list);
2931 static struct protection_domain *protection_domain_alloc(void)
2933 struct protection_domain *domain;
2935 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
2939 if (protection_domain_init(domain))
2942 add_domain_to_list(domain);
2952 static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
2954 struct protection_domain *pdomain;
2955 struct dma_ops_domain *dma_domain;
2958 case IOMMU_DOMAIN_UNMANAGED:
2959 pdomain = protection_domain_alloc();
2963 pdomain->mode = PAGE_MODE_3_LEVEL;
2964 pdomain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
2965 if (!pdomain->pt_root) {
2966 protection_domain_free(pdomain);
2970 pdomain->domain.geometry.aperture_start = 0;
2971 pdomain->domain.geometry.aperture_end = ~0ULL;
2972 pdomain->domain.geometry.force_aperture = true;
2975 case IOMMU_DOMAIN_DMA:
2976 dma_domain = dma_ops_domain_alloc();
2978 pr_err("AMD-Vi: Failed to allocate\n");
2981 pdomain = &dma_domain->domain;
2983 case IOMMU_DOMAIN_IDENTITY:
2984 pdomain = protection_domain_alloc();
2988 pdomain->mode = PAGE_MODE_NONE;
2994 return &pdomain->domain;
2997 static void amd_iommu_domain_free(struct iommu_domain *dom)
2999 struct protection_domain *domain;
3004 domain = to_pdomain(dom);
3006 if (domain->dev_cnt > 0)
3007 cleanup_domain(domain);
3009 BUG_ON(domain->dev_cnt != 0);
3011 if (domain->mode != PAGE_MODE_NONE)
3012 free_pagetable(domain);
3014 if (domain->flags & PD_IOMMUV2_MASK)
3015 free_gcr3_table(domain);
3017 protection_domain_free(domain);
3020 static void amd_iommu_detach_device(struct iommu_domain *dom,
3023 struct iommu_dev_data *dev_data = dev->archdata.iommu;
3024 struct amd_iommu *iommu;
3027 if (!check_device(dev))
3030 devid = get_device_id(dev);
3032 if (dev_data->domain != NULL)
3035 iommu = amd_iommu_rlookup_table[devid];
3039 iommu_completion_wait(iommu);
3042 static int amd_iommu_attach_device(struct iommu_domain *dom,
3045 struct protection_domain *domain = to_pdomain(dom);
3046 struct iommu_dev_data *dev_data;
3047 struct amd_iommu *iommu;
3050 if (!check_device(dev))
3053 dev_data = dev->archdata.iommu;
3055 iommu = amd_iommu_rlookup_table[dev_data->devid];
3059 if (dev_data->domain)
3062 ret = attach_device(dev, domain);
3064 iommu_completion_wait(iommu);
3069 static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
3070 phys_addr_t paddr, size_t page_size, int iommu_prot)
3072 struct protection_domain *domain = to_pdomain(dom);
3076 if (domain->mode == PAGE_MODE_NONE)
3079 if (iommu_prot & IOMMU_READ)
3080 prot |= IOMMU_PROT_IR;
3081 if (iommu_prot & IOMMU_WRITE)
3082 prot |= IOMMU_PROT_IW;
3084 mutex_lock(&domain->api_lock);
3085 ret = iommu_map_page(domain, iova, paddr, prot, page_size);
3086 mutex_unlock(&domain->api_lock);
3091 static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
3094 struct protection_domain *domain = to_pdomain(dom);
3097 if (domain->mode == PAGE_MODE_NONE)
3100 mutex_lock(&domain->api_lock);
3101 unmap_size = iommu_unmap_page(domain, iova, page_size);
3102 mutex_unlock(&domain->api_lock);
3104 domain_flush_tlb_pde(domain);
3109 static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
3112 struct protection_domain *domain = to_pdomain(dom);
3113 unsigned long offset_mask, pte_pgsize;
3116 if (domain->mode == PAGE_MODE_NONE)
3119 pte = fetch_pte(domain, iova, &pte_pgsize);
3121 if (!pte || !IOMMU_PTE_PRESENT(*pte))
3124 offset_mask = pte_pgsize - 1;
3125 __pte = *pte & PM_ADDR_MASK;
3127 return (__pte & ~offset_mask) | (iova & offset_mask);
3130 static bool amd_iommu_capable(enum iommu_cap cap)
3133 case IOMMU_CAP_CACHE_COHERENCY:
3135 case IOMMU_CAP_INTR_REMAP:
3136 return (irq_remapping_enabled == 1);
3137 case IOMMU_CAP_NOEXEC:
3144 static void amd_iommu_get_dm_regions(struct device *dev,
3145 struct list_head *head)
3147 struct unity_map_entry *entry;
3150 devid = get_device_id(dev);
3152 list_for_each_entry(entry, &amd_iommu_unity_map, list) {
3153 struct iommu_dm_region *region;
3155 if (devid < entry->devid_start || devid > entry->devid_end)
3158 region = kzalloc(sizeof(*region), GFP_KERNEL);
3160 pr_err("Out of memory allocating dm-regions for %s\n",
3165 region->start = entry->address_start;
3166 region->length = entry->address_end - entry->address_start;
3167 if (entry->prot & IOMMU_PROT_IR)
3168 region->prot |= IOMMU_READ;
3169 if (entry->prot & IOMMU_PROT_IW)
3170 region->prot |= IOMMU_WRITE;
3172 list_add_tail(®ion->list, head);
3176 static void amd_iommu_put_dm_regions(struct device *dev,
3177 struct list_head *head)
3179 struct iommu_dm_region *entry, *next;
3181 list_for_each_entry_safe(entry, next, head, list)
3185 static const struct iommu_ops amd_iommu_ops = {
3186 .capable = amd_iommu_capable,
3187 .domain_alloc = amd_iommu_domain_alloc,
3188 .domain_free = amd_iommu_domain_free,
3189 .attach_dev = amd_iommu_attach_device,
3190 .detach_dev = amd_iommu_detach_device,
3191 .map = amd_iommu_map,
3192 .unmap = amd_iommu_unmap,
3193 .map_sg = default_iommu_map_sg,
3194 .iova_to_phys = amd_iommu_iova_to_phys,
3195 .add_device = amd_iommu_add_device,
3196 .remove_device = amd_iommu_remove_device,
3197 .get_dm_regions = amd_iommu_get_dm_regions,
3198 .put_dm_regions = amd_iommu_put_dm_regions,
3199 .pgsize_bitmap = AMD_IOMMU_PGSIZES,
3202 /*****************************************************************************
3204 * The next functions do a basic initialization of IOMMU for pass through
3207 * In passthrough mode the IOMMU is initialized and enabled but not used for
3208 * DMA-API translation.
3210 *****************************************************************************/
3212 /* IOMMUv2 specific functions */
3213 int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
3215 return atomic_notifier_chain_register(&ppr_notifier, nb);
3217 EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);
3219 int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
3221 return atomic_notifier_chain_unregister(&ppr_notifier, nb);
3223 EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
3225 void amd_iommu_domain_direct_map(struct iommu_domain *dom)
3227 struct protection_domain *domain = to_pdomain(dom);
3228 unsigned long flags;
3230 spin_lock_irqsave(&domain->lock, flags);
3232 /* Update data structure */
3233 domain->mode = PAGE_MODE_NONE;
3234 domain->updated = true;
3236 /* Make changes visible to IOMMUs */
3237 update_domain(domain);
3239 /* Page-table is not visible to IOMMU anymore, so free it */
3240 free_pagetable(domain);
3242 spin_unlock_irqrestore(&domain->lock, flags);
3244 EXPORT_SYMBOL(amd_iommu_domain_direct_map);
3246 int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
3248 struct protection_domain *domain = to_pdomain(dom);
3249 unsigned long flags;
3252 if (pasids <= 0 || pasids > (PASID_MASK + 1))
3255 /* Number of GCR3 table levels required */
3256 for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
3259 if (levels > amd_iommu_max_glx_val)
3262 spin_lock_irqsave(&domain->lock, flags);
3265 * Save us all sanity checks whether devices already in the
3266 * domain support IOMMUv2. Just force that the domain has no
3267 * devices attached when it is switched into IOMMUv2 mode.
3270 if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK)
3274 domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
3275 if (domain->gcr3_tbl == NULL)
3278 domain->glx = levels;
3279 domain->flags |= PD_IOMMUV2_MASK;
3280 domain->updated = true;
3282 update_domain(domain);
3287 spin_unlock_irqrestore(&domain->lock, flags);
3291 EXPORT_SYMBOL(amd_iommu_domain_enable_v2);
3293 static int __flush_pasid(struct protection_domain *domain, int pasid,
3294 u64 address, bool size)
3296 struct iommu_dev_data *dev_data;
3297 struct iommu_cmd cmd;
3300 if (!(domain->flags & PD_IOMMUV2_MASK))
3303 build_inv_iommu_pasid(&cmd, domain->id, pasid, address, size);
3306 * IOMMU TLB needs to be flushed before Device TLB to
3307 * prevent device TLB refill from IOMMU TLB
3309 for (i = 0; i < amd_iommus_present; ++i) {
3310 if (domain->dev_iommu[i] == 0)
3313 ret = iommu_queue_command(amd_iommus[i], &cmd);
3318 /* Wait until IOMMU TLB flushes are complete */
3319 domain_flush_complete(domain);
3321 /* Now flush device TLBs */
3322 list_for_each_entry(dev_data, &domain->dev_list, list) {
3323 struct amd_iommu *iommu;
3327 There might be non-IOMMUv2 capable devices in an IOMMUv2
3330 if (!dev_data->ats.enabled)
3333 qdep = dev_data->ats.qdep;
3334 iommu = amd_iommu_rlookup_table[dev_data->devid];
3336 build_inv_iotlb_pasid(&cmd, dev_data->devid, pasid,
3337 qdep, address, size);
3339 ret = iommu_queue_command(iommu, &cmd);
3344 /* Wait until all device TLBs are flushed */
3345 domain_flush_complete(domain);
3354 static int __amd_iommu_flush_page(struct protection_domain *domain, int pasid,
3357 INC_STATS_COUNTER(invalidate_iotlb);
3359 return __flush_pasid(domain, pasid, address, false);
3362 int amd_iommu_flush_page(struct iommu_domain *dom, int pasid,
3365 struct protection_domain *domain = to_pdomain(dom);
3366 unsigned long flags;
3369 spin_lock_irqsave(&domain->lock, flags);
3370 ret = __amd_iommu_flush_page(domain, pasid, address);
3371 spin_unlock_irqrestore(&domain->lock, flags);
3375 EXPORT_SYMBOL(amd_iommu_flush_page);
3377 static int __amd_iommu_flush_tlb(struct protection_domain *domain, int pasid)
3379 INC_STATS_COUNTER(invalidate_iotlb_all);
3381 return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
3385 int amd_iommu_flush_tlb(struct iommu_domain *dom, int pasid)
3387 struct protection_domain *domain = to_pdomain(dom);
3388 unsigned long flags;
3391 spin_lock_irqsave(&domain->lock, flags);
3392 ret = __amd_iommu_flush_tlb(domain, pasid);
3393 spin_unlock_irqrestore(&domain->lock, flags);
3397 EXPORT_SYMBOL(amd_iommu_flush_tlb);
3399 static u64 *__get_gcr3_pte(u64 *root, int level, int pasid, bool alloc)
3406 index = (pasid >> (9 * level)) & 0x1ff;
3412 if (!(*pte & GCR3_VALID)) {
3416 root = (void *)get_zeroed_page(GFP_ATOMIC);
3420 *pte = __pa(root) | GCR3_VALID;
3423 root = __va(*pte & PAGE_MASK);
3431 static int __set_gcr3(struct protection_domain *domain, int pasid,
3436 if (domain->mode != PAGE_MODE_NONE)
3439 pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true);
3443 *pte = (cr3 & PAGE_MASK) | GCR3_VALID;
3445 return __amd_iommu_flush_tlb(domain, pasid);
3448 static int __clear_gcr3(struct protection_domain *domain, int pasid)
3452 if (domain->mode != PAGE_MODE_NONE)
3455 pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false);
3461 return __amd_iommu_flush_tlb(domain, pasid);
3464 int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid,
3467 struct protection_domain *domain = to_pdomain(dom);
3468 unsigned long flags;
3471 spin_lock_irqsave(&domain->lock, flags);
3472 ret = __set_gcr3(domain, pasid, cr3);
3473 spin_unlock_irqrestore(&domain->lock, flags);
3477 EXPORT_SYMBOL(amd_iommu_domain_set_gcr3);
3479 int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid)
3481 struct protection_domain *domain = to_pdomain(dom);
3482 unsigned long flags;
3485 spin_lock_irqsave(&domain->lock, flags);
3486 ret = __clear_gcr3(domain, pasid);
3487 spin_unlock_irqrestore(&domain->lock, flags);
3491 EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3);
3493 int amd_iommu_complete_ppr(struct pci_dev *pdev, int pasid,
3494 int status, int tag)
3496 struct iommu_dev_data *dev_data;
3497 struct amd_iommu *iommu;
3498 struct iommu_cmd cmd;
3500 INC_STATS_COUNTER(complete_ppr);
3502 dev_data = get_dev_data(&pdev->dev);
3503 iommu = amd_iommu_rlookup_table[dev_data->devid];
3505 build_complete_ppr(&cmd, dev_data->devid, pasid, status,
3506 tag, dev_data->pri_tlp);
3508 return iommu_queue_command(iommu, &cmd);
3510 EXPORT_SYMBOL(amd_iommu_complete_ppr);
3512 struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev)
3514 struct protection_domain *pdomain;
3516 pdomain = get_domain(&pdev->dev);
3517 if (IS_ERR(pdomain))
3520 /* Only return IOMMUv2 domains */
3521 if (!(pdomain->flags & PD_IOMMUV2_MASK))
3524 return &pdomain->domain;
3526 EXPORT_SYMBOL(amd_iommu_get_v2_domain);
3528 void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum)
3530 struct iommu_dev_data *dev_data;
3532 if (!amd_iommu_v2_supported())
3535 dev_data = get_dev_data(&pdev->dev);
3536 dev_data->errata |= (1 << erratum);
3538 EXPORT_SYMBOL(amd_iommu_enable_device_erratum);
3540 int amd_iommu_device_info(struct pci_dev *pdev,
3541 struct amd_iommu_device_info *info)
3546 if (pdev == NULL || info == NULL)
3549 if (!amd_iommu_v2_supported())
3552 memset(info, 0, sizeof(*info));
3554 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS);
3556 info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;
3558 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
3560 info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;
3562 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
3566 max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1));
3567 max_pasids = min(max_pasids, (1 << 20));
3569 info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
3570 info->max_pasids = min(pci_max_pasids(pdev), max_pasids);
3572 features = pci_pasid_features(pdev);
3573 if (features & PCI_PASID_CAP_EXEC)
3574 info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
3575 if (features & PCI_PASID_CAP_PRIV)
3576 info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
3581 EXPORT_SYMBOL(amd_iommu_device_info);
3583 #ifdef CONFIG_IRQ_REMAP
3585 /*****************************************************************************
3587 * Interrupt Remapping Implementation
3589 *****************************************************************************/
3607 u16 devid; /* Device ID for IRTE table */
3608 u16 index; /* Index into IRTE table*/
3611 struct amd_ir_data {
3612 struct irq_2_irte irq_2_irte;
3613 union irte irte_entry;
3615 struct msi_msg msi_entry;
3619 static struct irq_chip amd_ir_chip;
3621 #define DTE_IRQ_PHYS_ADDR_MASK (((1ULL << 45)-1) << 6)
3622 #define DTE_IRQ_REMAP_INTCTL (2ULL << 60)
3623 #define DTE_IRQ_TABLE_LEN (8ULL << 1)
3624 #define DTE_IRQ_REMAP_ENABLE 1ULL
3626 static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
3630 dte = amd_iommu_dev_table[devid].data[2];
3631 dte &= ~DTE_IRQ_PHYS_ADDR_MASK;
3632 dte |= virt_to_phys(table->table);
3633 dte |= DTE_IRQ_REMAP_INTCTL;
3634 dte |= DTE_IRQ_TABLE_LEN;
3635 dte |= DTE_IRQ_REMAP_ENABLE;
3637 amd_iommu_dev_table[devid].data[2] = dte;
3640 #define IRTE_ALLOCATED (~1U)
3642 static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
3644 struct irq_remap_table *table = NULL;
3645 struct amd_iommu *iommu;
3646 unsigned long flags;
3649 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
3651 iommu = amd_iommu_rlookup_table[devid];
3655 table = irq_lookup_table[devid];
3659 alias = amd_iommu_alias_table[devid];
3660 table = irq_lookup_table[alias];
3662 irq_lookup_table[devid] = table;
3663 set_dte_irq_entry(devid, table);
3664 iommu_flush_dte(iommu, devid);
3668 /* Nothing there yet, allocate new irq remapping table */
3669 table = kzalloc(sizeof(*table), GFP_ATOMIC);
3673 /* Initialize table spin-lock */
3674 spin_lock_init(&table->lock);
3677 /* Keep the first 32 indexes free for IOAPIC interrupts */
3678 table->min_index = 32;
3680 table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_ATOMIC);
3681 if (!table->table) {
3687 memset(table->table, 0, MAX_IRQS_PER_TABLE * sizeof(u32));
3692 for (i = 0; i < 32; ++i)
3693 table->table[i] = IRTE_ALLOCATED;
3696 irq_lookup_table[devid] = table;
3697 set_dte_irq_entry(devid, table);
3698 iommu_flush_dte(iommu, devid);
3699 if (devid != alias) {
3700 irq_lookup_table[alias] = table;
3701 set_dte_irq_entry(alias, table);
3702 iommu_flush_dte(iommu, alias);
3706 iommu_completion_wait(iommu);
3709 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
3714 static int alloc_irq_index(u16 devid, int count)
3716 struct irq_remap_table *table;
3717 unsigned long flags;
3720 table = get_irq_table(devid, false);
3724 spin_lock_irqsave(&table->lock, flags);
3726 /* Scan table for free entries */
3727 for (c = 0, index = table->min_index;
3728 index < MAX_IRQS_PER_TABLE;
3730 if (table->table[index] == 0)
3737 table->table[index - c + 1] = IRTE_ALLOCATED;
3747 spin_unlock_irqrestore(&table->lock, flags);
3752 static int modify_irte(u16 devid, int index, union irte irte)
3754 struct irq_remap_table *table;
3755 struct amd_iommu *iommu;
3756 unsigned long flags;
3758 iommu = amd_iommu_rlookup_table[devid];
3762 table = get_irq_table(devid, false);
3766 spin_lock_irqsave(&table->lock, flags);
3767 table->table[index] = irte.val;
3768 spin_unlock_irqrestore(&table->lock, flags);
3770 iommu_flush_irt(iommu, devid);
3771 iommu_completion_wait(iommu);
3776 static void free_irte(u16 devid, int index)
3778 struct irq_remap_table *table;
3779 struct amd_iommu *iommu;
3780 unsigned long flags;
3782 iommu = amd_iommu_rlookup_table[devid];
3786 table = get_irq_table(devid, false);
3790 spin_lock_irqsave(&table->lock, flags);
3791 table->table[index] = 0;
3792 spin_unlock_irqrestore(&table->lock, flags);
3794 iommu_flush_irt(iommu, devid);
3795 iommu_completion_wait(iommu);
3798 static int get_devid(struct irq_alloc_info *info)
3802 switch (info->type) {
3803 case X86_IRQ_ALLOC_TYPE_IOAPIC:
3804 devid = get_ioapic_devid(info->ioapic_id);
3806 case X86_IRQ_ALLOC_TYPE_HPET:
3807 devid = get_hpet_devid(info->hpet_id);
3809 case X86_IRQ_ALLOC_TYPE_MSI:
3810 case X86_IRQ_ALLOC_TYPE_MSIX:
3811 devid = get_device_id(&info->msi_dev->dev);
3821 static struct irq_domain *get_ir_irq_domain(struct irq_alloc_info *info)
3823 struct amd_iommu *iommu;
3829 devid = get_devid(info);
3831 iommu = amd_iommu_rlookup_table[devid];
3833 return iommu->ir_domain;
3839 static struct irq_domain *get_irq_domain(struct irq_alloc_info *info)
3841 struct amd_iommu *iommu;
3847 switch (info->type) {
3848 case X86_IRQ_ALLOC_TYPE_MSI:
3849 case X86_IRQ_ALLOC_TYPE_MSIX:
3850 devid = get_device_id(&info->msi_dev->dev);
3852 iommu = amd_iommu_rlookup_table[devid];
3854 return iommu->msi_domain;
3864 struct irq_remap_ops amd_iommu_irq_ops = {
3865 .prepare = amd_iommu_prepare,
3866 .enable = amd_iommu_enable,
3867 .disable = amd_iommu_disable,
3868 .reenable = amd_iommu_reenable,
3869 .enable_faulting = amd_iommu_enable_faulting,
3870 .get_ir_irq_domain = get_ir_irq_domain,
3871 .get_irq_domain = get_irq_domain,
3874 static void irq_remapping_prepare_irte(struct amd_ir_data *data,
3875 struct irq_cfg *irq_cfg,
3876 struct irq_alloc_info *info,
3877 int devid, int index, int sub_handle)
3879 struct irq_2_irte *irte_info = &data->irq_2_irte;
3880 struct msi_msg *msg = &data->msi_entry;
3881 union irte *irte = &data->irte_entry;
3882 struct IO_APIC_route_entry *entry;
3884 data->irq_2_irte.devid = devid;
3885 data->irq_2_irte.index = index + sub_handle;
3887 /* Setup IRTE for IOMMU */
3889 irte->fields.vector = irq_cfg->vector;
3890 irte->fields.int_type = apic->irq_delivery_mode;
3891 irte->fields.destination = irq_cfg->dest_apicid;
3892 irte->fields.dm = apic->irq_dest_mode;
3893 irte->fields.valid = 1;
3895 switch (info->type) {
3896 case X86_IRQ_ALLOC_TYPE_IOAPIC:
3897 /* Setup IOAPIC entry */
3898 entry = info->ioapic_entry;
3899 info->ioapic_entry = NULL;
3900 memset(entry, 0, sizeof(*entry));
3901 entry->vector = index;
3903 entry->trigger = info->ioapic_trigger;
3904 entry->polarity = info->ioapic_polarity;
3905 /* Mask level triggered irqs. */
3906 if (info->ioapic_trigger)
3910 case X86_IRQ_ALLOC_TYPE_HPET:
3911 case X86_IRQ_ALLOC_TYPE_MSI:
3912 case X86_IRQ_ALLOC_TYPE_MSIX:
3913 msg->address_hi = MSI_ADDR_BASE_HI;
3914 msg->address_lo = MSI_ADDR_BASE_LO;
3915 msg->data = irte_info->index;
3924 static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
3925 unsigned int nr_irqs, void *arg)
3927 struct irq_alloc_info *info = arg;
3928 struct irq_data *irq_data;
3929 struct amd_ir_data *data;
3930 struct irq_cfg *cfg;
3936 if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_MSI &&
3937 info->type != X86_IRQ_ALLOC_TYPE_MSIX)
3941 * With IRQ remapping enabled, don't need contiguous CPU vectors
3942 * to support multiple MSI interrupts.
3944 if (info->type == X86_IRQ_ALLOC_TYPE_MSI)
3945 info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
3947 devid = get_devid(info);
3951 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
3955 if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
3956 if (get_irq_table(devid, true))
3957 index = info->ioapic_pin;
3961 index = alloc_irq_index(devid, nr_irqs);
3964 pr_warn("Failed to allocate IRTE\n");
3965 goto out_free_parent;
3968 for (i = 0; i < nr_irqs; i++) {
3969 irq_data = irq_domain_get_irq_data(domain, virq + i);
3970 cfg = irqd_cfg(irq_data);
3971 if (!irq_data || !cfg) {
3977 data = kzalloc(sizeof(*data), GFP_KERNEL);
3981 irq_data->hwirq = (devid << 16) + i;
3982 irq_data->chip_data = data;
3983 irq_data->chip = &amd_ir_chip;
3984 irq_remapping_prepare_irte(data, cfg, info, devid, index, i);
3985 irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT);
3991 for (i--; i >= 0; i--) {
3992 irq_data = irq_domain_get_irq_data(domain, virq + i);
3994 kfree(irq_data->chip_data);
3996 for (i = 0; i < nr_irqs; i++)
3997 free_irte(devid, index + i);
3999 irq_domain_free_irqs_common(domain, virq, nr_irqs);
4003 static void irq_remapping_free(struct irq_domain *domain, unsigned int virq,
4004 unsigned int nr_irqs)
4006 struct irq_2_irte *irte_info;
4007 struct irq_data *irq_data;
4008 struct amd_ir_data *data;
4011 for (i = 0; i < nr_irqs; i++) {
4012 irq_data = irq_domain_get_irq_data(domain, virq + i);
4013 if (irq_data && irq_data->chip_data) {
4014 data = irq_data->chip_data;
4015 irte_info = &data->irq_2_irte;
4016 free_irte(irte_info->devid, irte_info->index);
4020 irq_domain_free_irqs_common(domain, virq, nr_irqs);
4023 static void irq_remapping_activate(struct irq_domain *domain,
4024 struct irq_data *irq_data)
4026 struct amd_ir_data *data = irq_data->chip_data;
4027 struct irq_2_irte *irte_info = &data->irq_2_irte;
4029 modify_irte(irte_info->devid, irte_info->index, data->irte_entry);
4032 static void irq_remapping_deactivate(struct irq_domain *domain,
4033 struct irq_data *irq_data)
4035 struct amd_ir_data *data = irq_data->chip_data;
4036 struct irq_2_irte *irte_info = &data->irq_2_irte;
4040 modify_irte(irte_info->devid, irte_info->index, data->irte_entry);
4043 static struct irq_domain_ops amd_ir_domain_ops = {
4044 .alloc = irq_remapping_alloc,
4045 .free = irq_remapping_free,
4046 .activate = irq_remapping_activate,
4047 .deactivate = irq_remapping_deactivate,
4050 static int amd_ir_set_affinity(struct irq_data *data,
4051 const struct cpumask *mask, bool force)
4053 struct amd_ir_data *ir_data = data->chip_data;
4054 struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
4055 struct irq_cfg *cfg = irqd_cfg(data);
4056 struct irq_data *parent = data->parent_data;
4059 ret = parent->chip->irq_set_affinity(parent, mask, force);
4060 if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE)
4064 * Atomically updates the IRTE with the new destination, vector
4065 * and flushes the interrupt entry cache.
4067 ir_data->irte_entry.fields.vector = cfg->vector;
4068 ir_data->irte_entry.fields.destination = cfg->dest_apicid;
4069 modify_irte(irte_info->devid, irte_info->index, ir_data->irte_entry);
4072 * After this point, all the interrupts will start arriving
4073 * at the new destination. So, time to cleanup the previous
4074 * vector allocation.
4076 send_cleanup_vector(cfg);
4078 return IRQ_SET_MASK_OK_DONE;
4081 static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg)
4083 struct amd_ir_data *ir_data = irq_data->chip_data;
4085 *msg = ir_data->msi_entry;
4088 static struct irq_chip amd_ir_chip = {
4089 .irq_ack = ir_ack_apic_edge,
4090 .irq_set_affinity = amd_ir_set_affinity,
4091 .irq_compose_msi_msg = ir_compose_msi_msg,
4094 int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
4096 iommu->ir_domain = irq_domain_add_tree(NULL, &amd_ir_domain_ops, iommu);
4097 if (!iommu->ir_domain)
4100 iommu->ir_domain->parent = arch_get_ir_parent_domain();
4101 iommu->msi_domain = arch_create_msi_irq_domain(iommu->ir_domain);