1 // SPDX-License-Identifier: GPL-2.0
3 * intel-pasid.c - PASID idr, table and entry manipulation
5 * Copyright (C) 2018 Intel Corporation
10 #define pr_fmt(fmt) "DMAR: " fmt
12 #include <linux/bitops.h>
13 #include <linux/cpufeature.h>
14 #include <linux/dmar.h>
15 #include <linux/intel-iommu.h>
16 #include <linux/iommu.h>
17 #include <linux/memory.h>
18 #include <linux/pci.h>
19 #include <linux/pci-ats.h>
20 #include <linux/spinlock.h>
22 #include "intel-pasid.h"
25 * Intel IOMMU system wide PASID name space:
27 static DEFINE_SPINLOCK(pasid_lock);
28 u32 intel_pasid_max_id = PASID_MAX;
30 int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int *pasid)
37 raw_spin_lock_irqsave(&iommu->register_lock, flags);
38 dmar_writeq(iommu->reg + DMAR_VCMD_REG, VCMD_CMD_ALLOC);
39 IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
40 !(res & VCMD_VRSP_IP), res);
41 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
43 status_code = VCMD_VRSP_SC(res);
44 switch (status_code) {
45 case VCMD_VRSP_SC_SUCCESS:
46 *pasid = VCMD_VRSP_RESULT_PASID(res);
48 case VCMD_VRSP_SC_NO_PASID_AVAIL:
49 pr_info("IOMMU: %s: No PASID available\n", iommu->name);
54 pr_warn("IOMMU: %s: Unexpected error code %d\n",
55 iommu->name, status_code);
61 void vcmd_free_pasid(struct intel_iommu *iommu, unsigned int pasid)
67 raw_spin_lock_irqsave(&iommu->register_lock, flags);
68 dmar_writeq(iommu->reg + DMAR_VCMD_REG,
69 VCMD_CMD_OPERAND(pasid) | VCMD_CMD_FREE);
70 IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
71 !(res & VCMD_VRSP_IP), res);
72 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
74 status_code = VCMD_VRSP_SC(res);
75 switch (status_code) {
76 case VCMD_VRSP_SC_SUCCESS:
78 case VCMD_VRSP_SC_INVALID_PASID:
79 pr_info("IOMMU: %s: Invalid PASID\n", iommu->name);
82 pr_warn("IOMMU: %s: Unexpected error code %d\n",
83 iommu->name, status_code);
88 * Per device pasid table management:
91 device_attach_pasid_table(struct device_domain_info *info,
92 struct pasid_table *pasid_table)
94 info->pasid_table = pasid_table;
95 list_add(&info->table, &pasid_table->dev);
99 device_detach_pasid_table(struct device_domain_info *info,
100 struct pasid_table *pasid_table)
102 info->pasid_table = NULL;
103 list_del(&info->table);
106 struct pasid_table_opaque {
107 struct pasid_table **pasid_table;
113 static int search_pasid_table(struct device_domain_info *info, void *opaque)
115 struct pasid_table_opaque *data = opaque;
117 if (info->iommu->segment == data->segment &&
118 info->bus == data->bus &&
119 info->devfn == data->devfn &&
121 *data->pasid_table = info->pasid_table;
128 static int get_alias_pasid_table(struct pci_dev *pdev, u16 alias, void *opaque)
130 struct pasid_table_opaque *data = opaque;
132 data->segment = pci_domain_nr(pdev->bus);
133 data->bus = PCI_BUS_NUM(alias);
134 data->devfn = alias & 0xff;
136 return for_each_device_domain(&search_pasid_table, data);
140 * Allocate a pasid table for @dev. It should be called in a
141 * single-thread context.
143 int intel_pasid_alloc_table(struct device *dev)
145 struct device_domain_info *info;
146 struct pasid_table *pasid_table;
147 struct pasid_table_opaque data;
154 info = get_domain_info(dev);
155 if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table))
158 /* DMA alias device already has a pasid table, use it: */
159 data.pasid_table = &pasid_table;
160 ret = pci_for_each_dma_alias(to_pci_dev(dev),
161 &get_alias_pasid_table, &data);
165 pasid_table = kzalloc(sizeof(*pasid_table), GFP_KERNEL);
168 INIT_LIST_HEAD(&pasid_table->dev);
170 if (info->pasid_supported)
171 max_pasid = min_t(int, pci_max_pasids(to_pci_dev(dev)),
174 size = max_pasid >> (PASID_PDE_SHIFT - 3);
175 order = size ? get_order(size) : 0;
176 pages = alloc_pages_node(info->iommu->node,
177 GFP_KERNEL | __GFP_ZERO, order);
183 pasid_table->table = page_address(pages);
184 pasid_table->order = order;
185 pasid_table->max_pasid = 1 << (order + PAGE_SHIFT + 3);
188 device_attach_pasid_table(info, pasid_table);
193 void intel_pasid_free_table(struct device *dev)
195 struct device_domain_info *info;
196 struct pasid_table *pasid_table;
197 struct pasid_dir_entry *dir;
198 struct pasid_entry *table;
201 info = get_domain_info(dev);
202 if (!info || !dev_is_pci(dev) || !info->pasid_table)
205 pasid_table = info->pasid_table;
206 device_detach_pasid_table(info, pasid_table);
208 if (!list_empty(&pasid_table->dev))
211 /* Free scalable mode PASID directory tables: */
212 dir = pasid_table->table;
213 max_pde = pasid_table->max_pasid >> PASID_PDE_SHIFT;
214 for (i = 0; i < max_pde; i++) {
215 table = get_pasid_table_from_pde(&dir[i]);
216 free_pgtable_page(table);
219 free_pages((unsigned long)pasid_table->table, pasid_table->order);
223 struct pasid_table *intel_pasid_get_table(struct device *dev)
225 struct device_domain_info *info;
227 info = get_domain_info(dev);
231 return info->pasid_table;
234 int intel_pasid_get_dev_max_id(struct device *dev)
236 struct device_domain_info *info;
238 info = get_domain_info(dev);
239 if (!info || !info->pasid_table)
242 return info->pasid_table->max_pasid;
245 struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid)
247 struct device_domain_info *info;
248 struct pasid_table *pasid_table;
249 struct pasid_dir_entry *dir;
250 struct pasid_entry *entries;
251 int dir_index, index;
253 pasid_table = intel_pasid_get_table(dev);
254 if (WARN_ON(!pasid_table || pasid < 0 ||
255 pasid >= intel_pasid_get_dev_max_id(dev)))
258 dir = pasid_table->table;
259 info = get_domain_info(dev);
260 dir_index = pasid >> PASID_PDE_SHIFT;
261 index = pasid & PASID_PTE_MASK;
263 spin_lock(&pasid_lock);
264 entries = get_pasid_table_from_pde(&dir[dir_index]);
266 entries = alloc_pgtable_page(info->iommu->node);
268 spin_unlock(&pasid_lock);
272 WRITE_ONCE(dir[dir_index].val,
273 (u64)virt_to_phys(entries) | PASID_PTE_PRESENT);
275 spin_unlock(&pasid_lock);
277 return &entries[index];
281 * Interfaces for PASID table entry manipulation:
283 static inline void pasid_clear_entry(struct pasid_entry *pe)
285 WRITE_ONCE(pe->val[0], 0);
286 WRITE_ONCE(pe->val[1], 0);
287 WRITE_ONCE(pe->val[2], 0);
288 WRITE_ONCE(pe->val[3], 0);
289 WRITE_ONCE(pe->val[4], 0);
290 WRITE_ONCE(pe->val[5], 0);
291 WRITE_ONCE(pe->val[6], 0);
292 WRITE_ONCE(pe->val[7], 0);
295 static inline void pasid_clear_entry_with_fpd(struct pasid_entry *pe)
297 WRITE_ONCE(pe->val[0], PASID_PTE_FPD);
298 WRITE_ONCE(pe->val[1], 0);
299 WRITE_ONCE(pe->val[2], 0);
300 WRITE_ONCE(pe->val[3], 0);
301 WRITE_ONCE(pe->val[4], 0);
302 WRITE_ONCE(pe->val[5], 0);
303 WRITE_ONCE(pe->val[6], 0);
304 WRITE_ONCE(pe->val[7], 0);
308 intel_pasid_clear_entry(struct device *dev, int pasid, bool fault_ignore)
310 struct pasid_entry *pe;
312 pe = intel_pasid_get_entry(dev, pasid);
316 if (fault_ignore && pasid_pte_is_present(pe))
317 pasid_clear_entry_with_fpd(pe);
319 pasid_clear_entry(pe);
322 static inline void pasid_set_bits(u64 *ptr, u64 mask, u64 bits)
326 old = READ_ONCE(*ptr);
327 WRITE_ONCE(*ptr, (old & ~mask) | bits);
331 * Setup the DID(Domain Identifier) field (Bit 64~79) of scalable mode
335 pasid_set_domain_id(struct pasid_entry *pe, u64 value)
337 pasid_set_bits(&pe->val[1], GENMASK_ULL(15, 0), value);
341 * Get domain ID value of a scalable mode PASID entry.
344 pasid_get_domain_id(struct pasid_entry *pe)
346 return (u16)(READ_ONCE(pe->val[1]) & GENMASK_ULL(15, 0));
350 * Setup the SLPTPTR(Second Level Page Table Pointer) field (Bit 12~63)
351 * of a scalable mode PASID entry.
354 pasid_set_slptr(struct pasid_entry *pe, u64 value)
356 pasid_set_bits(&pe->val[0], VTD_PAGE_MASK, value);
360 * Setup the AW(Address Width) field (Bit 2~4) of a scalable mode PASID
364 pasid_set_address_width(struct pasid_entry *pe, u64 value)
366 pasid_set_bits(&pe->val[0], GENMASK_ULL(4, 2), value << 2);
370 * Setup the PGTT(PASID Granular Translation Type) field (Bit 6~8)
371 * of a scalable mode PASID entry.
374 pasid_set_translation_type(struct pasid_entry *pe, u64 value)
376 pasid_set_bits(&pe->val[0], GENMASK_ULL(8, 6), value << 6);
380 * Enable fault processing by clearing the FPD(Fault Processing
381 * Disable) field (Bit 1) of a scalable mode PASID entry.
383 static inline void pasid_set_fault_enable(struct pasid_entry *pe)
385 pasid_set_bits(&pe->val[0], 1 << 1, 0);
389 * Setup the SRE(Supervisor Request Enable) field (Bit 128) of a
390 * scalable mode PASID entry.
392 static inline void pasid_set_sre(struct pasid_entry *pe)
394 pasid_set_bits(&pe->val[2], 1 << 0, 1);
398 * Setup the P(Present) field (Bit 0) of a scalable mode PASID
401 static inline void pasid_set_present(struct pasid_entry *pe)
403 pasid_set_bits(&pe->val[0], 1 << 0, 1);
407 * Setup Page Walk Snoop bit (Bit 87) of a scalable mode PASID
410 static inline void pasid_set_page_snoop(struct pasid_entry *pe, bool value)
412 pasid_set_bits(&pe->val[1], 1 << 23, value << 23);
416 * Setup the First Level Page table Pointer field (Bit 140~191)
417 * of a scalable mode PASID entry.
420 pasid_set_flptr(struct pasid_entry *pe, u64 value)
422 pasid_set_bits(&pe->val[2], VTD_PAGE_MASK, value);
426 * Setup the First Level Paging Mode field (Bit 130~131) of a
427 * scalable mode PASID entry.
430 pasid_set_flpm(struct pasid_entry *pe, u64 value)
432 pasid_set_bits(&pe->val[2], GENMASK_ULL(3, 2), value << 2);
436 * Setup the Extended Access Flag Enable (EAFE) field (Bit 135)
437 * of a scalable mode PASID entry.
440 pasid_set_eafe(struct pasid_entry *pe)
442 pasid_set_bits(&pe->val[2], 1 << 7, 1 << 7);
446 pasid_cache_invalidation_with_pasid(struct intel_iommu *iommu,
451 desc.qw0 = QI_PC_DID(did) | QI_PC_GRAN(QI_PC_PASID_SEL) |
452 QI_PC_PASID(pasid) | QI_PC_TYPE;
457 qi_submit_sync(iommu, &desc, 1, 0);
461 iotlb_invalidation_with_pasid(struct intel_iommu *iommu, u16 did, u32 pasid)
465 desc.qw0 = QI_EIOTLB_PASID(pasid) | QI_EIOTLB_DID(did) |
466 QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) | QI_EIOTLB_TYPE;
471 qi_submit_sync(iommu, &desc, 1, 0);
475 devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
476 struct device *dev, int pasid)
478 struct device_domain_info *info;
479 u16 sid, qdep, pfsid;
481 info = get_domain_info(dev);
482 if (!info || !info->ats_enabled)
485 sid = info->bus << 8 | info->devfn;
486 qdep = info->ats_qdep;
489 qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
492 void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
493 int pasid, bool fault_ignore)
495 struct pasid_entry *pte;
498 pte = intel_pasid_get_entry(dev, pasid);
502 did = pasid_get_domain_id(pte);
503 intel_pasid_clear_entry(dev, pasid, fault_ignore);
505 if (!ecap_coherent(iommu->ecap))
506 clflush_cache_range(pte, sizeof(*pte));
508 pasid_cache_invalidation_with_pasid(iommu, did, pasid);
509 iotlb_invalidation_with_pasid(iommu, did, pasid);
511 /* Device IOTLB doesn't need to be flushed in caching mode. */
512 if (!cap_caching_mode(iommu->cap))
513 devtlb_invalidation_with_pasid(iommu, dev, pasid);
516 static void pasid_flush_caches(struct intel_iommu *iommu,
517 struct pasid_entry *pte,
520 if (!ecap_coherent(iommu->ecap))
521 clflush_cache_range(pte, sizeof(*pte));
523 if (cap_caching_mode(iommu->cap)) {
524 pasid_cache_invalidation_with_pasid(iommu, did, pasid);
525 iotlb_invalidation_with_pasid(iommu, did, pasid);
527 iommu_flush_write_buffer(iommu);
532 * Set up the scalable mode pasid table entry for first only
535 int intel_pasid_setup_first_level(struct intel_iommu *iommu,
536 struct device *dev, pgd_t *pgd,
537 int pasid, u16 did, int flags)
539 struct pasid_entry *pte;
541 if (!ecap_flts(iommu->ecap)) {
542 pr_err("No first level translation support on %s\n",
547 pte = intel_pasid_get_entry(dev, pasid);
551 pasid_clear_entry(pte);
553 /* Setup the first level page table pointer: */
554 pasid_set_flptr(pte, (u64)__pa(pgd));
555 if (flags & PASID_FLAG_SUPERVISOR_MODE) {
556 if (!ecap_srs(iommu->ecap)) {
557 pr_err("No supervisor request support on %s\n",
564 if (flags & PASID_FLAG_FL5LP) {
565 if (cap_5lp_support(iommu->cap)) {
566 pasid_set_flpm(pte, 1);
568 pr_err("No 5-level paging support for first-level\n");
569 pasid_clear_entry(pte);
574 pasid_set_domain_id(pte, did);
575 pasid_set_address_width(pte, iommu->agaw);
576 pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
578 /* Setup Present and PASID Granular Transfer Type: */
579 pasid_set_translation_type(pte, PASID_ENTRY_PGTT_FL_ONLY);
580 pasid_set_present(pte);
581 pasid_flush_caches(iommu, pte, pasid, did);
587 * Skip top levels of page tables for iommu which has less agaw
588 * than default. Unnecessary for PT mode.
590 static inline int iommu_skip_agaw(struct dmar_domain *domain,
591 struct intel_iommu *iommu,
592 struct dma_pte **pgd)
596 for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) {
597 *pgd = phys_to_virt(dma_pte_addr(*pgd));
598 if (!dma_pte_present(*pgd))
606 * Set up the scalable mode pasid entry for second only translation type.
608 int intel_pasid_setup_second_level(struct intel_iommu *iommu,
609 struct dmar_domain *domain,
610 struct device *dev, int pasid)
612 struct pasid_entry *pte;
619 * If hardware advertises no support for second level
620 * translation, return directly.
622 if (!ecap_slts(iommu->ecap)) {
623 pr_err("No second level translation support on %s\n",
629 agaw = iommu_skip_agaw(domain, iommu, &pgd);
631 dev_err(dev, "Invalid domain page table\n");
635 pgd_val = virt_to_phys(pgd);
636 did = domain->iommu_did[iommu->seq_id];
638 pte = intel_pasid_get_entry(dev, pasid);
640 dev_err(dev, "Failed to get pasid entry of PASID %d\n", pasid);
644 pasid_clear_entry(pte);
645 pasid_set_domain_id(pte, did);
646 pasid_set_slptr(pte, pgd_val);
647 pasid_set_address_width(pte, agaw);
648 pasid_set_translation_type(pte, PASID_ENTRY_PGTT_SL_ONLY);
649 pasid_set_fault_enable(pte);
650 pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
653 * Since it is a second level only translation setup, we should
654 * set SRE bit as well (addresses are expected to be GPAs).
657 pasid_set_present(pte);
658 pasid_flush_caches(iommu, pte, pasid, did);
664 * Set up the scalable mode pasid entry for passthrough translation type.
666 int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
667 struct dmar_domain *domain,
668 struct device *dev, int pasid)
670 u16 did = FLPT_DEFAULT_DID;
671 struct pasid_entry *pte;
673 pte = intel_pasid_get_entry(dev, pasid);
675 dev_err(dev, "Failed to get pasid entry of PASID %d\n", pasid);
679 pasid_clear_entry(pte);
680 pasid_set_domain_id(pte, did);
681 pasid_set_address_width(pte, iommu->agaw);
682 pasid_set_translation_type(pte, PASID_ENTRY_PGTT_PT);
683 pasid_set_fault_enable(pte);
684 pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
687 * We should set SRE bit as well since the addresses are expected
691 pasid_set_present(pte);
692 pasid_flush_caches(iommu, pte, pasid, did);
698 intel_pasid_setup_bind_data(struct intel_iommu *iommu, struct pasid_entry *pte,
699 struct iommu_gpasid_bind_data_vtd *pasid_data)
702 * Not all guest PASID table entry fields are passed down during bind,
703 * here we only set up the ones that are dependent on guest settings.
704 * Execution related bits such as NXE, SMEP are not supported.
705 * Other fields, such as snoop related, are set based on host needs
706 * regardless of guest settings.
708 if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_SRE) {
709 if (!ecap_srs(iommu->ecap)) {
710 pr_err_ratelimited("No supervisor request support on %s\n",
717 if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_EAFE) {
718 if (!ecap_eafs(iommu->ecap)) {
719 pr_err_ratelimited("No extended access flag support on %s\n",
727 * Memory type is only applicable to devices inside processor coherent
728 * domain. Will add MTS support once coherent devices are available.
730 if (pasid_data->flags & IOMMU_SVA_VTD_GPASID_MTS_MASK) {
731 pr_warn_ratelimited("No memory type support %s\n",
740 * intel_pasid_setup_nested() - Set up PASID entry for nested translation.
741 * This could be used for guest shared virtual address. In this case, the
742 * first level page tables are used for GVA-GPA translation in the guest,
743 * second level page tables are used for GPA-HPA translation.
745 * @iommu: IOMMU which the device belong to
746 * @dev: Device to be set up for translation
747 * @gpgd: FLPTPTR: First Level Page translation pointer in GPA
748 * @pasid: PASID to be programmed in the device PASID table
749 * @pasid_data: Additional PASID info from the guest bind request
750 * @domain: Domain info for setting up second level page tables
751 * @addr_width: Address width of the first level (guest)
753 int intel_pasid_setup_nested(struct intel_iommu *iommu, struct device *dev,
754 pgd_t *gpgd, int pasid,
755 struct iommu_gpasid_bind_data_vtd *pasid_data,
756 struct dmar_domain *domain, int addr_width)
758 struct pasid_entry *pte;
765 if (!ecap_nest(iommu->ecap)) {
766 pr_err_ratelimited("IOMMU: %s: No nested translation support\n",
771 if (!(domain->flags & DOMAIN_FLAG_NESTING_MODE)) {
772 pr_err_ratelimited("Domain is not in nesting mode, %x\n",
777 pte = intel_pasid_get_entry(dev, pasid);
782 * Caller must ensure PASID entry is not in use, i.e. not bind the
783 * same PASID to the same device twice.
785 if (pasid_pte_is_present(pte))
788 pasid_clear_entry(pte);
790 /* Sanity checking performed by caller to make sure address
791 * width matching in two dimensions:
795 switch (addr_width) {
797 case ADDR_WIDTH_5LEVEL:
798 if (!cpu_feature_enabled(X86_FEATURE_LA57) ||
799 !cap_5lp_support(iommu->cap)) {
800 dev_err_ratelimited(dev,
801 "5-level paging not supported\n");
805 pasid_set_flpm(pte, 1);
808 case ADDR_WIDTH_4LEVEL:
809 pasid_set_flpm(pte, 0);
812 dev_err_ratelimited(dev, "Invalid guest address width %d\n",
817 /* First level PGD is in GPA, must be supported by the second level */
818 if ((uintptr_t)gpgd > domain->max_addr) {
819 dev_err_ratelimited(dev,
820 "Guest PGD %lx not supported, max %llx\n",
821 (uintptr_t)gpgd, domain->max_addr);
824 pasid_set_flptr(pte, (uintptr_t)gpgd);
826 ret = intel_pasid_setup_bind_data(iommu, pte, pasid_data);
830 /* Setup the second level based on the given domain */
833 agaw = iommu_skip_agaw(domain, iommu, &pgd);
835 dev_err_ratelimited(dev, "Invalid domain page table\n");
838 pgd_val = virt_to_phys(pgd);
839 pasid_set_slptr(pte, pgd_val);
840 pasid_set_fault_enable(pte);
842 did = domain->iommu_did[iommu->seq_id];
843 pasid_set_domain_id(pte, did);
845 pasid_set_address_width(pte, agaw);
846 pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
848 pasid_set_translation_type(pte, PASID_ENTRY_PGTT_NESTED);
849 pasid_set_present(pte);
850 pasid_flush_caches(iommu, pte, pasid, did);