2 * Copyright (c) 2006, Intel Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
17 * Copyright (C) 2006-2008 Intel Corporation
18 * Author: Ashok Raj <ashok.raj@intel.com>
19 * Author: Shaohua Li <shaohua.li@intel.com>
20 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
22 * This file implements early detection/parsing of Remapping Devices
23 * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
26 * These routines are used by both DMA-remapping and Interrupt-remapping
29 #define pr_fmt(fmt) "DMAR: " fmt
31 #include <linux/pci.h>
32 #include <linux/dmar.h>
33 #include <linux/iova.h>
34 #include <linux/intel-iommu.h>
35 #include <linux/timer.h>
36 #include <linux/irq.h>
37 #include <linux/interrupt.h>
38 #include <linux/tboot.h>
39 #include <linux/dmi.h>
40 #include <linux/slab.h>
41 #include <linux/iommu.h>
42 #include <asm/irq_remapping.h>
43 #include <asm/iommu_table.h>
45 #include "irq_remapping.h"
47 typedef int (*dmar_res_handler_t)(struct acpi_dmar_header *, void *);
48 struct dmar_res_callback {
49 dmar_res_handler_t cb[ACPI_DMAR_TYPE_RESERVED];
50 void *arg[ACPI_DMAR_TYPE_RESERVED];
51 bool ignore_unhandled;
57 * 1) The hotplug framework guarentees that DMAR unit will be hot-added
58 * before IO devices managed by that unit.
59 * 2) The hotplug framework guarantees that DMAR unit will be hot-removed
60 * after IO devices managed by that unit.
61 * 3) Hotplug events are rare.
63 * Locking rules for DMA and interrupt remapping related global data structures:
64 * 1) Use dmar_global_lock in process context
65 * 2) Use RCU in interrupt context
67 DECLARE_RWSEM(dmar_global_lock);
68 LIST_HEAD(dmar_drhd_units);
70 struct acpi_table_header * __initdata dmar_tbl;
71 static int dmar_dev_scope_status = 1;
72 static unsigned long dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)];
74 static int alloc_iommu(struct dmar_drhd_unit *drhd);
75 static void free_iommu(struct intel_iommu *iommu);
77 extern const struct iommu_ops intel_iommu_ops;
79 static void dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
82 * add INCLUDE_ALL at the tail, so scan the list will find it at
85 if (drhd->include_all)
86 list_add_tail_rcu(&drhd->list, &dmar_drhd_units);
88 list_add_rcu(&drhd->list, &dmar_drhd_units);
91 void *dmar_alloc_dev_scope(void *start, void *end, int *cnt)
93 struct acpi_dmar_device_scope *scope;
98 if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_NAMESPACE ||
99 scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
100 scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE)
102 else if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_IOAPIC &&
103 scope->entry_type != ACPI_DMAR_SCOPE_TYPE_HPET) {
104 pr_warn("Unsupported device scope\n");
106 start += scope->length;
111 return kcalloc(*cnt, sizeof(struct dmar_dev_scope), GFP_KERNEL);
114 void dmar_free_dev_scope(struct dmar_dev_scope **devices, int *cnt)
117 struct device *tmp_dev;
119 if (*devices && *cnt) {
120 for_each_active_dev_scope(*devices, *cnt, i, tmp_dev)
129 /* Optimize out kzalloc()/kfree() for normal cases */
130 static char dmar_pci_notify_info_buf[64];
132 static struct dmar_pci_notify_info *
133 dmar_alloc_pci_notify_info(struct pci_dev *dev, unsigned long event)
138 struct dmar_pci_notify_info *info;
140 BUG_ON(dev->is_virtfn);
142 /* Only generate path[] for device addition event */
143 if (event == BUS_NOTIFY_ADD_DEVICE)
144 for (tmp = dev; tmp; tmp = tmp->bus->self)
147 size = sizeof(*info) + level * sizeof(struct acpi_dmar_pci_path);
148 if (size <= sizeof(dmar_pci_notify_info_buf)) {
149 info = (struct dmar_pci_notify_info *)dmar_pci_notify_info_buf;
151 info = kzalloc(size, GFP_KERNEL);
153 pr_warn("Out of memory when allocating notify_info "
154 "for %s.\n", pci_name(dev));
155 if (dmar_dev_scope_status == 0)
156 dmar_dev_scope_status = -ENOMEM;
163 info->seg = pci_domain_nr(dev->bus);
165 if (event == BUS_NOTIFY_ADD_DEVICE) {
166 for (tmp = dev; tmp; tmp = tmp->bus->self) {
168 info->path[level].bus = tmp->bus->number;
169 info->path[level].device = PCI_SLOT(tmp->devfn);
170 info->path[level].function = PCI_FUNC(tmp->devfn);
171 if (pci_is_root_bus(tmp->bus))
172 info->bus = tmp->bus->number;
179 static inline void dmar_free_pci_notify_info(struct dmar_pci_notify_info *info)
181 if ((void *)info != dmar_pci_notify_info_buf)
185 static bool dmar_match_pci_path(struct dmar_pci_notify_info *info, int bus,
186 struct acpi_dmar_pci_path *path, int count)
190 if (info->bus != bus)
192 if (info->level != count)
195 for (i = 0; i < count; i++) {
196 if (path[i].device != info->path[i].device ||
197 path[i].function != info->path[i].function)
209 if (bus == info->path[i].bus &&
210 path[0].device == info->path[i].device &&
211 path[0].function == info->path[i].function) {
212 pr_info(FW_BUG "RMRR entry for device %02x:%02x.%x is broken - applying workaround\n",
213 bus, path[0].device, path[0].function);
220 /* Return: > 0 if match found, 0 if no match found, < 0 if error happens */
221 int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
222 void *start, void*end, u16 segment,
223 struct dmar_dev_scope *devices,
227 struct device *tmp, *dev = &info->dev->dev;
228 struct acpi_dmar_device_scope *scope;
229 struct acpi_dmar_pci_path *path;
231 if (segment != info->seg)
234 for (; start < end; start += scope->length) {
236 if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_ENDPOINT &&
237 scope->entry_type != ACPI_DMAR_SCOPE_TYPE_BRIDGE)
240 path = (struct acpi_dmar_pci_path *)(scope + 1);
241 level = (scope->length - sizeof(*scope)) / sizeof(*path);
242 if (!dmar_match_pci_path(info, scope->bus, path, level))
246 * We expect devices with endpoint scope to have normal PCI
247 * headers, and devices with bridge scope to have bridge PCI
248 * headers. However PCI NTB devices may be listed in the
249 * DMAR table with bridge scope, even though they have a
250 * normal PCI header. NTB devices are identified by class
251 * "BRIDGE_OTHER" (0680h) - we don't declare a socpe mismatch
252 * for this special case.
254 if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT &&
255 info->dev->hdr_type != PCI_HEADER_TYPE_NORMAL) ||
256 (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE &&
257 (info->dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
258 info->dev->class >> 8 != PCI_CLASS_BRIDGE_OTHER))) {
259 pr_warn("Device scope type does not match for %s\n",
260 pci_name(info->dev));
264 for_each_dev_scope(devices, devices_cnt, i, tmp)
266 devices[i].bus = info->dev->bus->number;
267 devices[i].devfn = info->dev->devfn;
268 rcu_assign_pointer(devices[i].dev,
272 BUG_ON(i >= devices_cnt);
278 int dmar_remove_dev_scope(struct dmar_pci_notify_info *info, u16 segment,
279 struct dmar_dev_scope *devices, int count)
284 if (info->seg != segment)
287 for_each_active_dev_scope(devices, count, index, tmp)
288 if (tmp == &info->dev->dev) {
289 RCU_INIT_POINTER(devices[index].dev, NULL);
298 static int dmar_pci_bus_add_dev(struct dmar_pci_notify_info *info)
301 struct dmar_drhd_unit *dmaru;
302 struct acpi_dmar_hardware_unit *drhd;
304 for_each_drhd_unit(dmaru) {
305 if (dmaru->include_all)
308 drhd = container_of(dmaru->hdr,
309 struct acpi_dmar_hardware_unit, header);
310 ret = dmar_insert_dev_scope(info, (void *)(drhd + 1),
311 ((void *)drhd) + drhd->header.length,
313 dmaru->devices, dmaru->devices_cnt);
318 ret = dmar_iommu_notify_scope_dev(info);
319 if (ret < 0 && dmar_dev_scope_status == 0)
320 dmar_dev_scope_status = ret;
325 static void dmar_pci_bus_del_dev(struct dmar_pci_notify_info *info)
327 struct dmar_drhd_unit *dmaru;
329 for_each_drhd_unit(dmaru)
330 if (dmar_remove_dev_scope(info, dmaru->segment,
331 dmaru->devices, dmaru->devices_cnt))
333 dmar_iommu_notify_scope_dev(info);
336 static int dmar_pci_bus_notifier(struct notifier_block *nb,
337 unsigned long action, void *data)
339 struct pci_dev *pdev = to_pci_dev(data);
340 struct dmar_pci_notify_info *info;
342 /* Only care about add/remove events for physical functions.
343 * For VFs we actually do the lookup based on the corresponding
344 * PF in device_to_iommu() anyway. */
347 if (action != BUS_NOTIFY_ADD_DEVICE &&
348 action != BUS_NOTIFY_REMOVED_DEVICE)
351 info = dmar_alloc_pci_notify_info(pdev, action);
355 down_write(&dmar_global_lock);
356 if (action == BUS_NOTIFY_ADD_DEVICE)
357 dmar_pci_bus_add_dev(info);
358 else if (action == BUS_NOTIFY_REMOVED_DEVICE)
359 dmar_pci_bus_del_dev(info);
360 up_write(&dmar_global_lock);
362 dmar_free_pci_notify_info(info);
367 static struct notifier_block dmar_pci_bus_nb = {
368 .notifier_call = dmar_pci_bus_notifier,
372 static struct dmar_drhd_unit *
373 dmar_find_dmaru(struct acpi_dmar_hardware_unit *drhd)
375 struct dmar_drhd_unit *dmaru;
377 list_for_each_entry_rcu(dmaru, &dmar_drhd_units, list)
378 if (dmaru->segment == drhd->segment &&
379 dmaru->reg_base_addr == drhd->address)
386 * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition
387 * structure which uniquely represent one DMA remapping hardware unit
388 * present in the platform
390 static int dmar_parse_one_drhd(struct acpi_dmar_header *header, void *arg)
392 struct acpi_dmar_hardware_unit *drhd;
393 struct dmar_drhd_unit *dmaru;
396 drhd = (struct acpi_dmar_hardware_unit *)header;
397 dmaru = dmar_find_dmaru(drhd);
401 dmaru = kzalloc(sizeof(*dmaru) + header->length, GFP_KERNEL);
406 * If header is allocated from slab by ACPI _DSM method, we need to
407 * copy the content because the memory buffer will be freed on return.
409 dmaru->hdr = (void *)(dmaru + 1);
410 memcpy(dmaru->hdr, header, header->length);
411 dmaru->reg_base_addr = drhd->address;
412 dmaru->segment = drhd->segment;
413 dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */
414 dmaru->devices = dmar_alloc_dev_scope((void *)(drhd + 1),
415 ((void *)drhd) + drhd->header.length,
416 &dmaru->devices_cnt);
417 if (dmaru->devices_cnt && dmaru->devices == NULL) {
422 ret = alloc_iommu(dmaru);
424 dmar_free_dev_scope(&dmaru->devices,
425 &dmaru->devices_cnt);
429 dmar_register_drhd_unit(dmaru);
438 static void dmar_free_drhd(struct dmar_drhd_unit *dmaru)
440 if (dmaru->devices && dmaru->devices_cnt)
441 dmar_free_dev_scope(&dmaru->devices, &dmaru->devices_cnt);
443 free_iommu(dmaru->iommu);
447 static int __init dmar_parse_one_andd(struct acpi_dmar_header *header,
450 struct acpi_dmar_andd *andd = (void *)header;
452 /* Check for NUL termination within the designated length */
453 if (strnlen(andd->device_name, header->length - 8) == header->length - 8) {
454 WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND,
455 "Your BIOS is broken; ANDD object name is not NUL-terminated\n"
456 "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
457 dmi_get_system_info(DMI_BIOS_VENDOR),
458 dmi_get_system_info(DMI_BIOS_VERSION),
459 dmi_get_system_info(DMI_PRODUCT_VERSION));
462 pr_info("ANDD device: %x name: %s\n", andd->device_number,
468 #ifdef CONFIG_ACPI_NUMA
469 static int dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg)
471 struct acpi_dmar_rhsa *rhsa;
472 struct dmar_drhd_unit *drhd;
474 rhsa = (struct acpi_dmar_rhsa *)header;
475 for_each_drhd_unit(drhd) {
476 if (drhd->reg_base_addr == rhsa->base_address) {
477 int node = acpi_map_pxm_to_node(rhsa->proximity_domain);
479 if (!node_online(node))
481 drhd->iommu->node = node;
486 1, TAINT_FIRMWARE_WORKAROUND,
487 "Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n"
488 "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
490 dmi_get_system_info(DMI_BIOS_VENDOR),
491 dmi_get_system_info(DMI_BIOS_VERSION),
492 dmi_get_system_info(DMI_PRODUCT_VERSION));
497 #define dmar_parse_one_rhsa dmar_res_noop
501 dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
503 struct acpi_dmar_hardware_unit *drhd;
504 struct acpi_dmar_reserved_memory *rmrr;
505 struct acpi_dmar_atsr *atsr;
506 struct acpi_dmar_rhsa *rhsa;
508 switch (header->type) {
509 case ACPI_DMAR_TYPE_HARDWARE_UNIT:
510 drhd = container_of(header, struct acpi_dmar_hardware_unit,
512 pr_info("DRHD base: %#016Lx flags: %#x\n",
513 (unsigned long long)drhd->address, drhd->flags);
515 case ACPI_DMAR_TYPE_RESERVED_MEMORY:
516 rmrr = container_of(header, struct acpi_dmar_reserved_memory,
518 pr_info("RMRR base: %#016Lx end: %#016Lx\n",
519 (unsigned long long)rmrr->base_address,
520 (unsigned long long)rmrr->end_address);
522 case ACPI_DMAR_TYPE_ROOT_ATS:
523 atsr = container_of(header, struct acpi_dmar_atsr, header);
524 pr_info("ATSR flags: %#x\n", atsr->flags);
526 case ACPI_DMAR_TYPE_HARDWARE_AFFINITY:
527 rhsa = container_of(header, struct acpi_dmar_rhsa, header);
528 pr_info("RHSA base: %#016Lx proximity domain: %#x\n",
529 (unsigned long long)rhsa->base_address,
530 rhsa->proximity_domain);
532 case ACPI_DMAR_TYPE_NAMESPACE:
533 /* We don't print this here because we need to sanity-check
534 it first. So print it in dmar_parse_one_andd() instead. */
540 * dmar_table_detect - checks to see if the platform supports DMAR devices
542 static int __init dmar_table_detect(void)
544 acpi_status status = AE_OK;
546 /* if we could find DMAR table, then there are DMAR devices */
547 status = acpi_get_table(ACPI_SIG_DMAR, 0, &dmar_tbl);
549 if (ACPI_SUCCESS(status) && !dmar_tbl) {
550 pr_warn("Unable to map DMAR\n");
551 status = AE_NOT_FOUND;
554 return (ACPI_SUCCESS(status) ? 1 : 0);
557 static int dmar_walk_remapping_entries(struct acpi_dmar_header *start,
558 size_t len, struct dmar_res_callback *cb)
561 struct acpi_dmar_header *iter, *next;
562 struct acpi_dmar_header *end = ((void *)start) + len;
564 for (iter = start; iter < end && ret == 0; iter = next) {
565 next = (void *)iter + iter->length;
566 if (iter->length == 0) {
567 /* Avoid looping forever on bad ACPI tables */
568 pr_debug(FW_BUG "Invalid 0-length structure\n");
570 } else if (next > end) {
571 /* Avoid passing table end */
572 pr_warn(FW_BUG "Record passes table end\n");
578 dmar_table_print_dmar_entry(iter);
580 if (iter->type >= ACPI_DMAR_TYPE_RESERVED) {
581 /* continue for forward compatibility */
582 pr_debug("Unknown DMAR structure type %d\n",
584 } else if (cb->cb[iter->type]) {
585 ret = cb->cb[iter->type](iter, cb->arg[iter->type]);
586 } else if (!cb->ignore_unhandled) {
587 pr_warn("No handler for DMAR structure type %d\n",
596 static inline int dmar_walk_dmar_table(struct acpi_table_dmar *dmar,
597 struct dmar_res_callback *cb)
599 return dmar_walk_remapping_entries((void *)(dmar + 1),
600 dmar->header.length - sizeof(*dmar), cb);
604 * parse_dmar_table - parses the DMA reporting table
607 parse_dmar_table(void)
609 struct acpi_table_dmar *dmar;
612 struct dmar_res_callback cb = {
614 .ignore_unhandled = true,
615 .arg[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &drhd_count,
616 .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_parse_one_drhd,
617 .cb[ACPI_DMAR_TYPE_RESERVED_MEMORY] = &dmar_parse_one_rmrr,
618 .cb[ACPI_DMAR_TYPE_ROOT_ATS] = &dmar_parse_one_atsr,
619 .cb[ACPI_DMAR_TYPE_HARDWARE_AFFINITY] = &dmar_parse_one_rhsa,
620 .cb[ACPI_DMAR_TYPE_NAMESPACE] = &dmar_parse_one_andd,
624 * Do it again, earlier dmar_tbl mapping could be mapped with
630 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
631 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
633 dmar_tbl = tboot_get_dmar_table(dmar_tbl);
635 dmar = (struct acpi_table_dmar *)dmar_tbl;
639 if (dmar->width < PAGE_SHIFT - 1) {
640 pr_warn("Invalid DMAR haw\n");
644 pr_info("Host address width %d\n", dmar->width + 1);
645 ret = dmar_walk_dmar_table(dmar, &cb);
646 if (ret == 0 && drhd_count == 0)
647 pr_warn(FW_BUG "No DRHD structure found in DMAR table\n");
652 static int dmar_pci_device_match(struct dmar_dev_scope devices[],
653 int cnt, struct pci_dev *dev)
659 for_each_active_dev_scope(devices, cnt, index, tmp)
660 if (dev_is_pci(tmp) && dev == to_pci_dev(tmp))
663 /* Check our parent */
664 dev = dev->bus->self;
670 struct dmar_drhd_unit *
671 dmar_find_matched_drhd_unit(struct pci_dev *dev)
673 struct dmar_drhd_unit *dmaru;
674 struct acpi_dmar_hardware_unit *drhd;
676 dev = pci_physfn(dev);
679 for_each_drhd_unit(dmaru) {
680 drhd = container_of(dmaru->hdr,
681 struct acpi_dmar_hardware_unit,
684 if (dmaru->include_all &&
685 drhd->segment == pci_domain_nr(dev->bus))
688 if (dmar_pci_device_match(dmaru->devices,
689 dmaru->devices_cnt, dev))
699 static void __init dmar_acpi_insert_dev_scope(u8 device_number,
700 struct acpi_device *adev)
702 struct dmar_drhd_unit *dmaru;
703 struct acpi_dmar_hardware_unit *drhd;
704 struct acpi_dmar_device_scope *scope;
707 struct acpi_dmar_pci_path *path;
709 for_each_drhd_unit(dmaru) {
710 drhd = container_of(dmaru->hdr,
711 struct acpi_dmar_hardware_unit,
714 for (scope = (void *)(drhd + 1);
715 (unsigned long)scope < ((unsigned long)drhd) + drhd->header.length;
716 scope = ((void *)scope) + scope->length) {
717 if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_NAMESPACE)
719 if (scope->enumeration_id != device_number)
722 path = (void *)(scope + 1);
723 pr_info("ACPI device \"%s\" under DMAR at %llx as %02x:%02x.%d\n",
724 dev_name(&adev->dev), dmaru->reg_base_addr,
725 scope->bus, path->device, path->function);
726 for_each_dev_scope(dmaru->devices, dmaru->devices_cnt, i, tmp)
728 dmaru->devices[i].bus = scope->bus;
729 dmaru->devices[i].devfn = PCI_DEVFN(path->device,
731 rcu_assign_pointer(dmaru->devices[i].dev,
732 get_device(&adev->dev));
735 BUG_ON(i >= dmaru->devices_cnt);
738 pr_warn("No IOMMU scope found for ANDD enumeration ID %d (%s)\n",
739 device_number, dev_name(&adev->dev));
742 static int __init dmar_acpi_dev_scope_init(void)
744 struct acpi_dmar_andd *andd;
746 if (dmar_tbl == NULL)
749 for (andd = (void *)dmar_tbl + sizeof(struct acpi_table_dmar);
750 ((unsigned long)andd) < ((unsigned long)dmar_tbl) + dmar_tbl->length;
751 andd = ((void *)andd) + andd->header.length) {
752 if (andd->header.type == ACPI_DMAR_TYPE_NAMESPACE) {
754 struct acpi_device *adev;
756 if (!ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT,
759 pr_err("Failed to find handle for ACPI object %s\n",
763 if (acpi_bus_get_device(h, &adev)) {
764 pr_err("Failed to get device for ACPI object %s\n",
768 dmar_acpi_insert_dev_scope(andd->device_number, adev);
774 int __init dmar_dev_scope_init(void)
776 struct pci_dev *dev = NULL;
777 struct dmar_pci_notify_info *info;
779 if (dmar_dev_scope_status != 1)
780 return dmar_dev_scope_status;
782 if (list_empty(&dmar_drhd_units)) {
783 dmar_dev_scope_status = -ENODEV;
785 dmar_dev_scope_status = 0;
787 dmar_acpi_dev_scope_init();
789 for_each_pci_dev(dev) {
793 info = dmar_alloc_pci_notify_info(dev,
794 BUS_NOTIFY_ADD_DEVICE);
796 return dmar_dev_scope_status;
798 dmar_pci_bus_add_dev(info);
799 dmar_free_pci_notify_info(info);
803 bus_register_notifier(&pci_bus_type, &dmar_pci_bus_nb);
806 return dmar_dev_scope_status;
810 int __init dmar_table_init(void)
812 static int dmar_table_initialized;
815 if (dmar_table_initialized == 0) {
816 ret = parse_dmar_table();
819 pr_info("Parse DMAR table failure.\n");
820 } else if (list_empty(&dmar_drhd_units)) {
821 pr_info("No DMAR devices found\n");
826 dmar_table_initialized = ret;
828 dmar_table_initialized = 1;
831 return dmar_table_initialized < 0 ? dmar_table_initialized : 0;
834 static void warn_invalid_dmar(u64 addr, const char *message)
837 1, TAINT_FIRMWARE_WORKAROUND,
838 "Your BIOS is broken; DMAR reported at address %llx%s!\n"
839 "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
841 dmi_get_system_info(DMI_BIOS_VENDOR),
842 dmi_get_system_info(DMI_BIOS_VERSION),
843 dmi_get_system_info(DMI_PRODUCT_VERSION));
847 dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg)
849 struct acpi_dmar_hardware_unit *drhd;
853 drhd = (void *)entry;
854 if (!drhd->address) {
855 warn_invalid_dmar(0, "");
860 addr = ioremap(drhd->address, VTD_PAGE_SIZE);
862 addr = early_ioremap(drhd->address, VTD_PAGE_SIZE);
864 pr_warn("Can't validate DRHD address: %llx\n", drhd->address);
868 cap = dmar_readq(addr + DMAR_CAP_REG);
869 ecap = dmar_readq(addr + DMAR_ECAP_REG);
874 early_iounmap(addr, VTD_PAGE_SIZE);
876 if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) {
877 warn_invalid_dmar(drhd->address, " returns all ones");
884 int __init detect_intel_iommu(void)
887 struct dmar_res_callback validate_drhd_cb = {
888 .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_validate_one_drhd,
889 .ignore_unhandled = true,
892 down_write(&dmar_global_lock);
893 ret = dmar_table_detect();
895 ret = !dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl,
897 if (ret && !no_iommu && !iommu_detected && !dmar_disabled) {
899 /* Make sure ACS will be enabled */
905 x86_init.iommu.iommu_init = intel_iommu_init;
908 acpi_put_table(dmar_tbl);
910 up_write(&dmar_global_lock);
912 return ret ? 1 : -ENODEV;
916 static void unmap_iommu(struct intel_iommu *iommu)
919 release_mem_region(iommu->reg_phys, iommu->reg_size);
923 * map_iommu: map the iommu's registers
924 * @iommu: the iommu to map
925 * @phys_addr: the physical address of the base resgister
927 * Memory map the iommu's registers. Start w/ a single page, and
928 * possibly expand if that turns out to be insufficent.
930 static int map_iommu(struct intel_iommu *iommu, u64 phys_addr)
934 iommu->reg_phys = phys_addr;
935 iommu->reg_size = VTD_PAGE_SIZE;
937 if (!request_mem_region(iommu->reg_phys, iommu->reg_size, iommu->name)) {
938 pr_err("Can't reserve memory\n");
943 iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size);
945 pr_err("Can't map the region\n");
950 iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
951 iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
953 if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) {
955 warn_invalid_dmar(phys_addr, " returns all ones");
959 /* the registers might be more than one page */
960 map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
961 cap_max_fault_reg_offset(iommu->cap));
962 map_size = VTD_PAGE_ALIGN(map_size);
963 if (map_size > iommu->reg_size) {
965 release_mem_region(iommu->reg_phys, iommu->reg_size);
966 iommu->reg_size = map_size;
967 if (!request_mem_region(iommu->reg_phys, iommu->reg_size,
969 pr_err("Can't reserve memory\n");
973 iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size);
975 pr_err("Can't map the region\n");
986 release_mem_region(iommu->reg_phys, iommu->reg_size);
991 static int dmar_alloc_seq_id(struct intel_iommu *iommu)
993 iommu->seq_id = find_first_zero_bit(dmar_seq_ids,
994 DMAR_UNITS_SUPPORTED);
995 if (iommu->seq_id >= DMAR_UNITS_SUPPORTED) {
998 set_bit(iommu->seq_id, dmar_seq_ids);
999 sprintf(iommu->name, "dmar%d", iommu->seq_id);
1002 return iommu->seq_id;
1005 static void dmar_free_seq_id(struct intel_iommu *iommu)
1007 if (iommu->seq_id >= 0) {
1008 clear_bit(iommu->seq_id, dmar_seq_ids);
1013 static int alloc_iommu(struct dmar_drhd_unit *drhd)
1015 struct intel_iommu *iommu;
1021 if (!drhd->reg_base_addr) {
1022 warn_invalid_dmar(0, "");
1026 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
1030 if (dmar_alloc_seq_id(iommu) < 0) {
1031 pr_err("Failed to allocate seq_id\n");
1036 err = map_iommu(iommu, drhd->reg_base_addr);
1038 pr_err("Failed to map %s\n", iommu->name);
1039 goto error_free_seq_id;
1043 agaw = iommu_calculate_agaw(iommu);
1045 pr_err("Cannot get a valid agaw for iommu (seq_id = %d)\n",
1049 msagaw = iommu_calculate_max_sagaw(iommu);
1051 pr_err("Cannot get a valid max agaw for iommu (seq_id = %d)\n",
1056 iommu->msagaw = msagaw;
1057 iommu->segment = drhd->segment;
1061 ver = readl(iommu->reg + DMAR_VER_REG);
1062 pr_info("%s: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n",
1064 (unsigned long long)drhd->reg_base_addr,
1065 DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
1066 (unsigned long long)iommu->cap,
1067 (unsigned long long)iommu->ecap);
1069 /* Reflect status in gcmd */
1070 sts = readl(iommu->reg + DMAR_GSTS_REG);
1071 if (sts & DMA_GSTS_IRES)
1072 iommu->gcmd |= DMA_GCMD_IRE;
1073 if (sts & DMA_GSTS_TES)
1074 iommu->gcmd |= DMA_GCMD_TE;
1075 if (sts & DMA_GSTS_QIES)
1076 iommu->gcmd |= DMA_GCMD_QIE;
1078 raw_spin_lock_init(&iommu->register_lock);
1080 if (intel_iommu_enabled) {
1081 iommu->iommu_dev = iommu_device_create(NULL, iommu,
1085 if (IS_ERR(iommu->iommu_dev)) {
1086 err = PTR_ERR(iommu->iommu_dev);
1090 iommu_device_set_ops(&iommu->iommu, &intel_iommu_ops);
1092 err = iommu_device_register(&iommu->iommu);
1097 drhd->iommu = iommu;
1104 dmar_free_seq_id(iommu);
1110 static void free_iommu(struct intel_iommu *iommu)
1112 iommu_device_destroy(iommu->iommu_dev);
1113 iommu_device_unregister(&iommu->iommu);
1116 if (iommu->pr_irq) {
1117 free_irq(iommu->pr_irq, iommu);
1118 dmar_free_hwirq(iommu->pr_irq);
1121 free_irq(iommu->irq, iommu);
1122 dmar_free_hwirq(iommu->irq);
1127 free_page((unsigned long)iommu->qi->desc);
1128 kfree(iommu->qi->desc_status);
1135 dmar_free_seq_id(iommu);
1140 * Reclaim all the submitted descriptors which have completed its work.
1142 static inline void reclaim_free_desc(struct q_inval *qi)
1144 while (qi->desc_status[qi->free_tail] == QI_DONE ||
1145 qi->desc_status[qi->free_tail] == QI_ABORT) {
1146 qi->desc_status[qi->free_tail] = QI_FREE;
1147 qi->free_tail = (qi->free_tail + 1) % QI_LENGTH;
1152 static int qi_check_fault(struct intel_iommu *iommu, int index)
1156 struct q_inval *qi = iommu->qi;
1157 int wait_index = (index + 1) % QI_LENGTH;
1159 if (qi->desc_status[wait_index] == QI_ABORT)
1162 fault = readl(iommu->reg + DMAR_FSTS_REG);
1165 * If IQE happens, the head points to the descriptor associated
1166 * with the error. No new descriptors are fetched until the IQE
1169 if (fault & DMA_FSTS_IQE) {
1170 head = readl(iommu->reg + DMAR_IQH_REG);
1171 if ((head >> DMAR_IQ_SHIFT) == index) {
1172 pr_err("VT-d detected invalid descriptor: "
1173 "low=%llx, high=%llx\n",
1174 (unsigned long long)qi->desc[index].low,
1175 (unsigned long long)qi->desc[index].high);
1176 memcpy(&qi->desc[index], &qi->desc[wait_index],
1177 sizeof(struct qi_desc));
1178 writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG);
1184 * If ITE happens, all pending wait_desc commands are aborted.
1185 * No new descriptors are fetched until the ITE is cleared.
1187 if (fault & DMA_FSTS_ITE) {
1188 head = readl(iommu->reg + DMAR_IQH_REG);
1189 head = ((head >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH;
1191 tail = readl(iommu->reg + DMAR_IQT_REG);
1192 tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH;
1194 writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG);
1197 if (qi->desc_status[head] == QI_IN_USE)
1198 qi->desc_status[head] = QI_ABORT;
1199 head = (head - 2 + QI_LENGTH) % QI_LENGTH;
1200 } while (head != tail);
1202 if (qi->desc_status[wait_index] == QI_ABORT)
1206 if (fault & DMA_FSTS_ICE)
1207 writel(DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG);
1213 * Submit the queued invalidation descriptor to the remapping
1214 * hardware unit and wait for its completion.
1216 int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu)
1219 struct q_inval *qi = iommu->qi;
1220 struct qi_desc *hw, wait_desc;
1221 int wait_index, index;
1222 unsigned long flags;
1232 raw_spin_lock_irqsave(&qi->q_lock, flags);
1233 while (qi->free_cnt < 3) {
1234 raw_spin_unlock_irqrestore(&qi->q_lock, flags);
1236 raw_spin_lock_irqsave(&qi->q_lock, flags);
1239 index = qi->free_head;
1240 wait_index = (index + 1) % QI_LENGTH;
1242 qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE;
1246 wait_desc.low = QI_IWD_STATUS_DATA(QI_DONE) |
1247 QI_IWD_STATUS_WRITE | QI_IWD_TYPE;
1248 wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]);
1250 hw[wait_index] = wait_desc;
1252 qi->free_head = (qi->free_head + 2) % QI_LENGTH;
1256 * update the HW tail register indicating the presence of
1259 writel(qi->free_head << DMAR_IQ_SHIFT, iommu->reg + DMAR_IQT_REG);
1261 while (qi->desc_status[wait_index] != QI_DONE) {
1263 * We will leave the interrupts disabled, to prevent interrupt
1264 * context to queue another cmd while a cmd is already submitted
1265 * and waiting for completion on this cpu. This is to avoid
1266 * a deadlock where the interrupt context can wait indefinitely
1267 * for free slots in the queue.
1269 rc = qi_check_fault(iommu, index);
1273 raw_spin_unlock(&qi->q_lock);
1275 raw_spin_lock(&qi->q_lock);
1278 qi->desc_status[index] = QI_DONE;
1280 reclaim_free_desc(qi);
1281 raw_spin_unlock_irqrestore(&qi->q_lock, flags);
1290 * Flush the global interrupt entry cache.
1292 void qi_global_iec(struct intel_iommu *iommu)
1294 struct qi_desc desc;
1296 desc.low = QI_IEC_TYPE;
1299 /* should never fail */
1300 qi_submit_sync(&desc, iommu);
1303 void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm,
1306 struct qi_desc desc;
1308 desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did)
1309 | QI_CC_GRAN(type) | QI_CC_TYPE;
1312 qi_submit_sync(&desc, iommu);
1315 void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
1316 unsigned int size_order, u64 type)
1320 struct qi_desc desc;
1323 if (cap_write_drain(iommu->cap))
1326 if (cap_read_drain(iommu->cap))
1329 desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) | QI_IOTLB_DW(dw)
1330 | QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE;
1331 desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih)
1332 | QI_IOTLB_AM(size_order);
1334 qi_submit_sync(&desc, iommu);
1337 void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
1338 u64 addr, unsigned mask)
1340 struct qi_desc desc;
1343 BUG_ON(addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1));
1344 addr |= (1 << (VTD_PAGE_SHIFT + mask - 1)) - 1;
1345 desc.high = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE;
1347 desc.high = QI_DEV_IOTLB_ADDR(addr);
1349 if (qdep >= QI_DEV_IOTLB_MAX_INVS)
1352 desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) |
1355 qi_submit_sync(&desc, iommu);
1359 * Disable Queued Invalidation interface.
1361 void dmar_disable_qi(struct intel_iommu *iommu)
1363 unsigned long flags;
1365 cycles_t start_time = get_cycles();
1367 if (!ecap_qis(iommu->ecap))
1370 raw_spin_lock_irqsave(&iommu->register_lock, flags);
1372 sts = readl(iommu->reg + DMAR_GSTS_REG);
1373 if (!(sts & DMA_GSTS_QIES))
1377 * Give a chance to HW to complete the pending invalidation requests.
1379 while ((readl(iommu->reg + DMAR_IQT_REG) !=
1380 readl(iommu->reg + DMAR_IQH_REG)) &&
1381 (DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time)))
1384 iommu->gcmd &= ~DMA_GCMD_QIE;
1385 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1387 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl,
1388 !(sts & DMA_GSTS_QIES), sts);
1390 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
1394 * Enable queued invalidation.
1396 static void __dmar_enable_qi(struct intel_iommu *iommu)
1399 unsigned long flags;
1400 struct q_inval *qi = iommu->qi;
1402 qi->free_head = qi->free_tail = 0;
1403 qi->free_cnt = QI_LENGTH;
1405 raw_spin_lock_irqsave(&iommu->register_lock, flags);
1407 /* write zero to the tail reg */
1408 writel(0, iommu->reg + DMAR_IQT_REG);
1410 dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc));
1412 iommu->gcmd |= DMA_GCMD_QIE;
1413 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1415 /* Make sure hardware complete it */
1416 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts);
1418 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
1422 * Enable Queued Invalidation interface. This is a must to support
1423 * interrupt-remapping. Also used by DMA-remapping, which replaces
1424 * register based IOTLB invalidation.
1426 int dmar_enable_qi(struct intel_iommu *iommu)
1429 struct page *desc_page;
1431 if (!ecap_qis(iommu->ecap))
1435 * queued invalidation is already setup and enabled.
1440 iommu->qi = kmalloc(sizeof(*qi), GFP_ATOMIC);
1447 desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO, 0);
1454 qi->desc = page_address(desc_page);
1456 qi->desc_status = kzalloc(QI_LENGTH * sizeof(int), GFP_ATOMIC);
1457 if (!qi->desc_status) {
1458 free_page((unsigned long) qi->desc);
1464 raw_spin_lock_init(&qi->q_lock);
1466 __dmar_enable_qi(iommu);
1471 /* iommu interrupt handling. Most stuff are MSI-like. */
1479 static const char *dma_remap_fault_reasons[] =
1482 "Present bit in root entry is clear",
1483 "Present bit in context entry is clear",
1484 "Invalid context entry",
1485 "Access beyond MGAW",
1486 "PTE Write access is not set",
1487 "PTE Read access is not set",
1488 "Next page table ptr is invalid",
1489 "Root table address invalid",
1490 "Context table ptr is invalid",
1491 "non-zero reserved fields in RTP",
1492 "non-zero reserved fields in CTP",
1493 "non-zero reserved fields in PTE",
1494 "PCE for translation request specifies blocking",
1497 static const char *irq_remap_fault_reasons[] =
1499 "Detected reserved fields in the decoded interrupt-remapped request",
1500 "Interrupt index exceeded the interrupt-remapping table size",
1501 "Present field in the IRTE entry is clear",
1502 "Error accessing interrupt-remapping table pointed by IRTA_REG",
1503 "Detected reserved fields in the IRTE entry",
1504 "Blocked a compatibility format interrupt request",
1505 "Blocked an interrupt request due to source-id verification failure",
1508 static const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type)
1510 if (fault_reason >= 0x20 && (fault_reason - 0x20 <
1511 ARRAY_SIZE(irq_remap_fault_reasons))) {
1512 *fault_type = INTR_REMAP;
1513 return irq_remap_fault_reasons[fault_reason - 0x20];
1514 } else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) {
1515 *fault_type = DMA_REMAP;
1516 return dma_remap_fault_reasons[fault_reason];
1518 *fault_type = UNKNOWN;
1524 static inline int dmar_msi_reg(struct intel_iommu *iommu, int irq)
1526 if (iommu->irq == irq)
1527 return DMAR_FECTL_REG;
1528 else if (iommu->pr_irq == irq)
1529 return DMAR_PECTL_REG;
1534 void dmar_msi_unmask(struct irq_data *data)
1536 struct intel_iommu *iommu = irq_data_get_irq_handler_data(data);
1537 int reg = dmar_msi_reg(iommu, data->irq);
1541 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1542 writel(0, iommu->reg + reg);
1543 /* Read a reg to force flush the post write */
1544 readl(iommu->reg + reg);
1545 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1548 void dmar_msi_mask(struct irq_data *data)
1550 struct intel_iommu *iommu = irq_data_get_irq_handler_data(data);
1551 int reg = dmar_msi_reg(iommu, data->irq);
1555 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1556 writel(DMA_FECTL_IM, iommu->reg + reg);
1557 /* Read a reg to force flush the post write */
1558 readl(iommu->reg + reg);
1559 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1562 void dmar_msi_write(int irq, struct msi_msg *msg)
1564 struct intel_iommu *iommu = irq_get_handler_data(irq);
1565 int reg = dmar_msi_reg(iommu, irq);
1568 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1569 writel(msg->data, iommu->reg + reg + 4);
1570 writel(msg->address_lo, iommu->reg + reg + 8);
1571 writel(msg->address_hi, iommu->reg + reg + 12);
1572 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1575 void dmar_msi_read(int irq, struct msi_msg *msg)
1577 struct intel_iommu *iommu = irq_get_handler_data(irq);
1578 int reg = dmar_msi_reg(iommu, irq);
1581 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1582 msg->data = readl(iommu->reg + reg + 4);
1583 msg->address_lo = readl(iommu->reg + reg + 8);
1584 msg->address_hi = readl(iommu->reg + reg + 12);
1585 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1588 static int dmar_fault_do_one(struct intel_iommu *iommu, int type,
1589 u8 fault_reason, u16 source_id, unsigned long long addr)
1594 reason = dmar_get_fault_reason(fault_reason, &fault_type);
1596 if (fault_type == INTR_REMAP)
1597 pr_err("[INTR-REMAP] Request device [%02x:%02x.%d] fault index %llx [fault reason %02d] %s\n",
1598 source_id >> 8, PCI_SLOT(source_id & 0xFF),
1599 PCI_FUNC(source_id & 0xFF), addr >> 48,
1600 fault_reason, reason);
1602 pr_err("[%s] Request device [%02x:%02x.%d] fault addr %llx [fault reason %02d] %s\n",
1603 type ? "DMA Read" : "DMA Write",
1604 source_id >> 8, PCI_SLOT(source_id & 0xFF),
1605 PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason);
1609 #define PRIMARY_FAULT_REG_LEN (16)
1610 irqreturn_t dmar_fault(int irq, void *dev_id)
1612 struct intel_iommu *iommu = dev_id;
1613 int reg, fault_index;
1617 static DEFINE_RATELIMIT_STATE(rs,
1618 DEFAULT_RATELIMIT_INTERVAL,
1619 DEFAULT_RATELIMIT_BURST);
1621 /* Disable printing, simply clear the fault when ratelimited */
1622 ratelimited = !__ratelimit(&rs);
1624 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1625 fault_status = readl(iommu->reg + DMAR_FSTS_REG);
1626 if (fault_status && !ratelimited)
1627 pr_err("DRHD: handling fault status reg %x\n", fault_status);
1629 /* TBD: ignore advanced fault log currently */
1630 if (!(fault_status & DMA_FSTS_PPF))
1633 fault_index = dma_fsts_fault_record_index(fault_status);
1634 reg = cap_fault_reg_offset(iommu->cap);
1642 /* highest 32 bits */
1643 data = readl(iommu->reg + reg +
1644 fault_index * PRIMARY_FAULT_REG_LEN + 12);
1645 if (!(data & DMA_FRCD_F))
1649 fault_reason = dma_frcd_fault_reason(data);
1650 type = dma_frcd_type(data);
1652 data = readl(iommu->reg + reg +
1653 fault_index * PRIMARY_FAULT_REG_LEN + 8);
1654 source_id = dma_frcd_source_id(data);
1656 guest_addr = dmar_readq(iommu->reg + reg +
1657 fault_index * PRIMARY_FAULT_REG_LEN);
1658 guest_addr = dma_frcd_page_addr(guest_addr);
1661 /* clear the fault */
1662 writel(DMA_FRCD_F, iommu->reg + reg +
1663 fault_index * PRIMARY_FAULT_REG_LEN + 12);
1665 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1668 dmar_fault_do_one(iommu, type, fault_reason,
1669 source_id, guest_addr);
1672 if (fault_index >= cap_num_fault_regs(iommu->cap))
1674 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1677 writel(DMA_FSTS_PFO | DMA_FSTS_PPF, iommu->reg + DMAR_FSTS_REG);
1680 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1684 int dmar_set_interrupt(struct intel_iommu *iommu)
1689 * Check if the fault interrupt is already initialized.
1694 irq = dmar_alloc_hwirq(iommu->seq_id, iommu->node, iommu);
1698 pr_err("No free IRQ vectors\n");
1702 ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu);
1704 pr_err("Can't request irq\n");
1708 int __init enable_drhd_fault_handling(void)
1710 struct dmar_drhd_unit *drhd;
1711 struct intel_iommu *iommu;
1714 * Enable fault control interrupt.
1716 for_each_iommu(iommu, drhd) {
1718 int ret = dmar_set_interrupt(iommu);
1721 pr_err("DRHD %Lx: failed to enable fault, interrupt, ret %d\n",
1722 (unsigned long long)drhd->reg_base_addr, ret);
1727 * Clear any previous faults.
1729 dmar_fault(iommu->irq, iommu);
1730 fault_status = readl(iommu->reg + DMAR_FSTS_REG);
1731 writel(fault_status, iommu->reg + DMAR_FSTS_REG);
1738 * Re-enable Queued Invalidation interface.
1740 int dmar_reenable_qi(struct intel_iommu *iommu)
1742 if (!ecap_qis(iommu->ecap))
1749 * First disable queued invalidation.
1751 dmar_disable_qi(iommu);
1753 * Then enable queued invalidation again. Since there is no pending
1754 * invalidation requests now, it's safe to re-enable queued
1757 __dmar_enable_qi(iommu);
1763 * Check interrupt remapping support in DMAR table description.
1765 int __init dmar_ir_support(void)
1767 struct acpi_table_dmar *dmar;
1768 dmar = (struct acpi_table_dmar *)dmar_tbl;
1771 return dmar->flags & 0x1;
1774 /* Check whether DMAR units are in use */
1775 static inline bool dmar_in_use(void)
1777 return irq_remapping_enabled || intel_iommu_enabled;
1780 static int __init dmar_free_unused_resources(void)
1782 struct dmar_drhd_unit *dmaru, *dmaru_n;
1787 if (dmar_dev_scope_status != 1 && !list_empty(&dmar_drhd_units))
1788 bus_unregister_notifier(&pci_bus_type, &dmar_pci_bus_nb);
1790 down_write(&dmar_global_lock);
1791 list_for_each_entry_safe(dmaru, dmaru_n, &dmar_drhd_units, list) {
1792 list_del(&dmaru->list);
1793 dmar_free_drhd(dmaru);
1795 up_write(&dmar_global_lock);
1800 late_initcall(dmar_free_unused_resources);
1801 IOMMU_INIT_POST(detect_intel_iommu);
1804 * DMAR Hotplug Support
1805 * For more details, please refer to Intel(R) Virtualization Technology
1806 * for Directed-IO Architecture Specifiction, Rev 2.2, Section 8.8
1807 * "Remapping Hardware Unit Hot Plug".
1809 static u8 dmar_hp_uuid[] = {
1810 /* 0000 */ 0xA6, 0xA3, 0xC1, 0xD8, 0x9B, 0xBE, 0x9B, 0x4C,
1811 /* 0008 */ 0x91, 0xBF, 0xC3, 0xCB, 0x81, 0xFC, 0x5D, 0xAF
1815 * Currently there's only one revision and BIOS will not check the revision id,
1816 * so use 0 for safety.
1818 #define DMAR_DSM_REV_ID 0
1819 #define DMAR_DSM_FUNC_DRHD 1
1820 #define DMAR_DSM_FUNC_ATSR 2
1821 #define DMAR_DSM_FUNC_RHSA 3
1823 static inline bool dmar_detect_dsm(acpi_handle handle, int func)
1825 return acpi_check_dsm(handle, dmar_hp_uuid, DMAR_DSM_REV_ID, 1 << func);
1828 static int dmar_walk_dsm_resource(acpi_handle handle, int func,
1829 dmar_res_handler_t handler, void *arg)
1832 union acpi_object *obj;
1833 struct acpi_dmar_header *start;
1834 struct dmar_res_callback callback;
1835 static int res_type[] = {
1836 [DMAR_DSM_FUNC_DRHD] = ACPI_DMAR_TYPE_HARDWARE_UNIT,
1837 [DMAR_DSM_FUNC_ATSR] = ACPI_DMAR_TYPE_ROOT_ATS,
1838 [DMAR_DSM_FUNC_RHSA] = ACPI_DMAR_TYPE_HARDWARE_AFFINITY,
1841 if (!dmar_detect_dsm(handle, func))
1844 obj = acpi_evaluate_dsm_typed(handle, dmar_hp_uuid, DMAR_DSM_REV_ID,
1845 func, NULL, ACPI_TYPE_BUFFER);
1849 memset(&callback, 0, sizeof(callback));
1850 callback.cb[res_type[func]] = handler;
1851 callback.arg[res_type[func]] = arg;
1852 start = (struct acpi_dmar_header *)obj->buffer.pointer;
1853 ret = dmar_walk_remapping_entries(start, obj->buffer.length, &callback);
1860 static int dmar_hp_add_drhd(struct acpi_dmar_header *header, void *arg)
1863 struct dmar_drhd_unit *dmaru;
1865 dmaru = dmar_find_dmaru((struct acpi_dmar_hardware_unit *)header);
1869 ret = dmar_ir_hotplug(dmaru, true);
1871 ret = dmar_iommu_hotplug(dmaru, true);
1876 static int dmar_hp_remove_drhd(struct acpi_dmar_header *header, void *arg)
1880 struct dmar_drhd_unit *dmaru;
1882 dmaru = dmar_find_dmaru((struct acpi_dmar_hardware_unit *)header);
1887 * All PCI devices managed by this unit should have been destroyed.
1889 if (!dmaru->include_all && dmaru->devices && dmaru->devices_cnt) {
1890 for_each_active_dev_scope(dmaru->devices,
1891 dmaru->devices_cnt, i, dev)
1895 ret = dmar_ir_hotplug(dmaru, false);
1897 ret = dmar_iommu_hotplug(dmaru, false);
1902 static int dmar_hp_release_drhd(struct acpi_dmar_header *header, void *arg)
1904 struct dmar_drhd_unit *dmaru;
1906 dmaru = dmar_find_dmaru((struct acpi_dmar_hardware_unit *)header);
1908 list_del_rcu(&dmaru->list);
1910 dmar_free_drhd(dmaru);
1916 static int dmar_hotplug_insert(acpi_handle handle)
1921 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1922 &dmar_validate_one_drhd, (void *)1);
1926 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1927 &dmar_parse_one_drhd, (void *)&drhd_count);
1928 if (ret == 0 && drhd_count == 0) {
1929 pr_warn(FW_BUG "No DRHD structures in buffer returned by _DSM method\n");
1935 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_RHSA,
1936 &dmar_parse_one_rhsa, NULL);
1940 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR,
1941 &dmar_parse_one_atsr, NULL);
1945 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1946 &dmar_hp_add_drhd, NULL);
1950 dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1951 &dmar_hp_remove_drhd, NULL);
1953 dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR,
1954 &dmar_release_one_atsr, NULL);
1956 dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1957 &dmar_hp_release_drhd, NULL);
1962 static int dmar_hotplug_remove(acpi_handle handle)
1966 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR,
1967 &dmar_check_one_atsr, NULL);
1971 ret = dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1972 &dmar_hp_remove_drhd, NULL);
1974 WARN_ON(dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_ATSR,
1975 &dmar_release_one_atsr, NULL));
1976 WARN_ON(dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1977 &dmar_hp_release_drhd, NULL));
1979 dmar_walk_dsm_resource(handle, DMAR_DSM_FUNC_DRHD,
1980 &dmar_hp_add_drhd, NULL);
1986 static acpi_status dmar_get_dsm_handle(acpi_handle handle, u32 lvl,
1987 void *context, void **retval)
1989 acpi_handle *phdl = retval;
1991 if (dmar_detect_dsm(handle, DMAR_DSM_FUNC_DRHD)) {
1993 return AE_CTRL_TERMINATE;
1999 static int dmar_device_hotplug(acpi_handle handle, bool insert)
2002 acpi_handle tmp = NULL;
2008 if (dmar_detect_dsm(handle, DMAR_DSM_FUNC_DRHD)) {
2011 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
2013 dmar_get_dsm_handle,
2015 if (ACPI_FAILURE(status)) {
2016 pr_warn("Failed to locate _DSM method.\n");
2023 down_write(&dmar_global_lock);
2025 ret = dmar_hotplug_insert(tmp);
2027 ret = dmar_hotplug_remove(tmp);
2028 up_write(&dmar_global_lock);
2033 int dmar_device_add(acpi_handle handle)
2035 return dmar_device_hotplug(handle, true);
2038 int dmar_device_remove(acpi_handle handle)
2040 return dmar_device_hotplug(handle, false);