xref: /openbmc/linux/drivers/iommu/intel/debugfs.c (revision 51ad5b54) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright © 2018 Intel Corporation.
4  *
5  * Authors: Gayatri Kammela <gayatri.kammela@intel.com>
6  *	    Sohil Mehta <sohil.mehta@intel.com>
7  *	    Jacob Pan <jacob.jun.pan@linux.intel.com>
8  *	    Lu Baolu <baolu.lu@linux.intel.com>
9  */
10 
11 #include <linux/debugfs.h>
12 #include <linux/dmar.h>
13 #include <linux/intel-iommu.h>
14 #include <linux/pci.h>
15 
16 #include <asm/irq_remapping.h>
17 
18 #include "intel-pasid.h"
19 
20 struct tbl_walk {
21 	u16 bus;
22 	u16 devfn;
23 	u32 pasid;
24 	struct root_entry *rt_entry;
25 	struct context_entry *ctx_entry;
26 	struct pasid_entry *pasid_tbl_entry;
27 };
28 
29 struct iommu_regset {
30 	int offset;
31 	const char *regs;
32 };
33 
34 #define IOMMU_REGSET_ENTRY(_reg_)					\
35 	{ DMAR_##_reg_##_REG, __stringify(_reg_) }
36 
37 static const struct iommu_regset iommu_regs_32[] = {
38 	IOMMU_REGSET_ENTRY(VER),
39 	IOMMU_REGSET_ENTRY(GCMD),
40 	IOMMU_REGSET_ENTRY(GSTS),
41 	IOMMU_REGSET_ENTRY(FSTS),
42 	IOMMU_REGSET_ENTRY(FECTL),
43 	IOMMU_REGSET_ENTRY(FEDATA),
44 	IOMMU_REGSET_ENTRY(FEADDR),
45 	IOMMU_REGSET_ENTRY(FEUADDR),
46 	IOMMU_REGSET_ENTRY(PMEN),
47 	IOMMU_REGSET_ENTRY(PLMBASE),
48 	IOMMU_REGSET_ENTRY(PLMLIMIT),
49 	IOMMU_REGSET_ENTRY(ICS),
50 	IOMMU_REGSET_ENTRY(PRS),
51 	IOMMU_REGSET_ENTRY(PECTL),
52 	IOMMU_REGSET_ENTRY(PEDATA),
53 	IOMMU_REGSET_ENTRY(PEADDR),
54 	IOMMU_REGSET_ENTRY(PEUADDR),
55 };
56 
57 static const struct iommu_regset iommu_regs_64[] = {
58 	IOMMU_REGSET_ENTRY(CAP),
59 	IOMMU_REGSET_ENTRY(ECAP),
60 	IOMMU_REGSET_ENTRY(RTADDR),
61 	IOMMU_REGSET_ENTRY(CCMD),
62 	IOMMU_REGSET_ENTRY(AFLOG),
63 	IOMMU_REGSET_ENTRY(PHMBASE),
64 	IOMMU_REGSET_ENTRY(PHMLIMIT),
65 	IOMMU_REGSET_ENTRY(IQH),
66 	IOMMU_REGSET_ENTRY(IQT),
67 	IOMMU_REGSET_ENTRY(IQA),
68 	IOMMU_REGSET_ENTRY(IRTA),
69 	IOMMU_REGSET_ENTRY(PQH),
70 	IOMMU_REGSET_ENTRY(PQT),
71 	IOMMU_REGSET_ENTRY(PQA),
72 	IOMMU_REGSET_ENTRY(MTRRCAP),
73 	IOMMU_REGSET_ENTRY(MTRRDEF),
74 	IOMMU_REGSET_ENTRY(MTRR_FIX64K_00000),
75 	IOMMU_REGSET_ENTRY(MTRR_FIX16K_80000),
76 	IOMMU_REGSET_ENTRY(MTRR_FIX16K_A0000),
77 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_C0000),
78 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_C8000),
79 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_D0000),
80 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_D8000),
81 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_E0000),
82 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_E8000),
83 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_F0000),
84 	IOMMU_REGSET_ENTRY(MTRR_FIX4K_F8000),
85 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE0),
86 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK0),
87 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE1),
88 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK1),
89 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE2),
90 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK2),
91 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE3),
92 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK3),
93 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE4),
94 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK4),
95 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE5),
96 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK5),
97 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE6),
98 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK6),
99 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE7),
100 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK7),
101 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE8),
102 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK8),
103 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE9),
104 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK9),
105 	IOMMU_REGSET_ENTRY(VCCAP),
106 	IOMMU_REGSET_ENTRY(VCMD),
107 	IOMMU_REGSET_ENTRY(VCRSP),
108 };
109 
110 static int iommu_regset_show(struct seq_file *m, void *unused)
111 {
112 	struct dmar_drhd_unit *drhd;
113 	struct intel_iommu *iommu;
114 	unsigned long flag;
115 	int i, ret = 0;
116 	u64 value;
117 
118 	rcu_read_lock();
119 	for_each_active_iommu(iommu, drhd) {
120 		if (!drhd->reg_base_addr) {
121 			seq_puts(m, "IOMMU: Invalid base address\n");
122 			ret = -EINVAL;
123 			goto out;
124 		}
125 
126 		seq_printf(m, "IOMMU: %s Register Base Address: %llx\n",
127 			   iommu->name, drhd->reg_base_addr);
128 		seq_puts(m, "Name\t\t\tOffset\t\tContents\n");
129 		/*
130 		 * Publish the contents of the 64-bit hardware registers
131 		 * by adding the offset to the pointer (virtual address).
132 		 */
133 		raw_spin_lock_irqsave(&iommu->register_lock, flag);
134 		for (i = 0 ; i < ARRAY_SIZE(iommu_regs_32); i++) {
135 			value = dmar_readl(iommu->reg + iommu_regs_32[i].offset);
136 			seq_printf(m, "%-16s\t0x%02x\t\t0x%016llx\n",
137 				   iommu_regs_32[i].regs, iommu_regs_32[i].offset,
138 				   value);
139 		}
140 		for (i = 0 ; i < ARRAY_SIZE(iommu_regs_64); i++) {
141 			value = dmar_readq(iommu->reg + iommu_regs_64[i].offset);
142 			seq_printf(m, "%-16s\t0x%02x\t\t0x%016llx\n",
143 				   iommu_regs_64[i].regs, iommu_regs_64[i].offset,
144 				   value);
145 		}
146 		raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
147 		seq_putc(m, '\n');
148 	}
149 out:
150 	rcu_read_unlock();
151 
152 	return ret;
153 }
154 DEFINE_SHOW_ATTRIBUTE(iommu_regset);
155 
156 static inline void print_tbl_walk(struct seq_file *m)
157 {
158 	struct tbl_walk *tbl_wlk = m->private;
159 
160 	seq_printf(m, "%02x:%02x.%x\t0x%016llx:0x%016llx\t0x%016llx:0x%016llx\t",
161 		   tbl_wlk->bus, PCI_SLOT(tbl_wlk->devfn),
162 		   PCI_FUNC(tbl_wlk->devfn), tbl_wlk->rt_entry->hi,
163 		   tbl_wlk->rt_entry->lo, tbl_wlk->ctx_entry->hi,
164 		   tbl_wlk->ctx_entry->lo);
165 
166 	/*
167 	 * A legacy mode DMAR doesn't support PASID, hence default it to -1
168 	 * indicating that it's invalid. Also, default all PASID related fields
169 	 * to 0.
170 	 */
171 	if (!tbl_wlk->pasid_tbl_entry)
172 		seq_printf(m, "%-6d\t0x%016llx:0x%016llx:0x%016llx\n", -1,
173 			   (u64)0, (u64)0, (u64)0);
174 	else
175 		seq_printf(m, "%-6d\t0x%016llx:0x%016llx:0x%016llx\n",
176 			   tbl_wlk->pasid, tbl_wlk->pasid_tbl_entry->val[2],
177 			   tbl_wlk->pasid_tbl_entry->val[1],
178 			   tbl_wlk->pasid_tbl_entry->val[0]);
179 }
180 
181 static void pasid_tbl_walk(struct seq_file *m, struct pasid_entry *tbl_entry,
182 			   u16 dir_idx)
183 {
184 	struct tbl_walk *tbl_wlk = m->private;
185 	u8 tbl_idx;
186 
187 	for (tbl_idx = 0; tbl_idx < PASID_TBL_ENTRIES; tbl_idx++) {
188 		if (pasid_pte_is_present(tbl_entry)) {
189 			tbl_wlk->pasid_tbl_entry = tbl_entry;
190 			tbl_wlk->pasid = (dir_idx << PASID_PDE_SHIFT) + tbl_idx;
191 			print_tbl_walk(m);
192 		}
193 
194 		tbl_entry++;
195 	}
196 }
197 
198 static void pasid_dir_walk(struct seq_file *m, u64 pasid_dir_ptr,
199 			   u16 pasid_dir_size)
200 {
201 	struct pasid_dir_entry *dir_entry = phys_to_virt(pasid_dir_ptr);
202 	struct pasid_entry *pasid_tbl;
203 	u16 dir_idx;
204 
205 	for (dir_idx = 0; dir_idx < pasid_dir_size; dir_idx++) {
206 		pasid_tbl = get_pasid_table_from_pde(dir_entry);
207 		if (pasid_tbl)
208 			pasid_tbl_walk(m, pasid_tbl, dir_idx);
209 
210 		dir_entry++;
211 	}
212 }
213 
214 static void ctx_tbl_walk(struct seq_file *m, struct intel_iommu *iommu, u16 bus)
215 {
216 	struct context_entry *context;
217 	u16 devfn, pasid_dir_size;
218 	u64 pasid_dir_ptr;
219 
220 	for (devfn = 0; devfn < 256; devfn++) {
221 		struct tbl_walk tbl_wlk = {0};
222 
223 		/*
224 		 * Scalable mode root entry points to upper scalable mode
225 		 * context table and lower scalable mode context table. Each
226 		 * scalable mode context table has 128 context entries where as
227 		 * legacy mode context table has 256 context entries. So in
228 		 * scalable mode, the context entries for former 128 devices are
229 		 * in the lower scalable mode context table, while the latter
230 		 * 128 devices are in the upper scalable mode context table.
231 		 * In scalable mode, when devfn > 127, iommu_context_addr()
232 		 * automatically refers to upper scalable mode context table and
233 		 * hence the caller doesn't have to worry about differences
234 		 * between scalable mode and non scalable mode.
235 		 */
236 		context = iommu_context_addr(iommu, bus, devfn, 0);
237 		if (!context)
238 			return;
239 
240 		if (!context_present(context))
241 			continue;
242 
243 		tbl_wlk.bus = bus;
244 		tbl_wlk.devfn = devfn;
245 		tbl_wlk.rt_entry = &iommu->root_entry[bus];
246 		tbl_wlk.ctx_entry = context;
247 		m->private = &tbl_wlk;
248 
249 		if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT) {
250 			pasid_dir_ptr = context->lo & VTD_PAGE_MASK;
251 			pasid_dir_size = get_pasid_dir_size(context);
252 			pasid_dir_walk(m, pasid_dir_ptr, pasid_dir_size);
253 			continue;
254 		}
255 
256 		print_tbl_walk(m);
257 	}
258 }
259 
260 static void root_tbl_walk(struct seq_file *m, struct intel_iommu *iommu)
261 {
262 	unsigned long flags;
263 	u16 bus;
264 
265 	spin_lock_irqsave(&iommu->lock, flags);
266 	seq_printf(m, "IOMMU %s: Root Table Address: 0x%llx\n", iommu->name,
267 		   (u64)virt_to_phys(iommu->root_entry));
268 	seq_puts(m, "B.D.F\tRoot_entry\t\t\t\tContext_entry\t\t\t\tPASID\tPASID_table_entry\n");
269 
270 	/*
271 	 * No need to check if the root entry is present or not because
272 	 * iommu_context_addr() performs the same check before returning
273 	 * context entry.
274 	 */
275 	for (bus = 0; bus < 256; bus++)
276 		ctx_tbl_walk(m, iommu, bus);
277 
278 	spin_unlock_irqrestore(&iommu->lock, flags);
279 }
280 
281 static int dmar_translation_struct_show(struct seq_file *m, void *unused)
282 {
283 	struct dmar_drhd_unit *drhd;
284 	struct intel_iommu *iommu;
285 	u32 sts;
286 
287 	rcu_read_lock();
288 	for_each_active_iommu(iommu, drhd) {
289 		sts = dmar_readl(iommu->reg + DMAR_GSTS_REG);
290 		if (!(sts & DMA_GSTS_TES)) {
291 			seq_printf(m, "DMA Remapping is not enabled on %s\n",
292 				   iommu->name);
293 			continue;
294 		}
295 		root_tbl_walk(m, iommu);
296 		seq_putc(m, '\n');
297 	}
298 	rcu_read_unlock();
299 
300 	return 0;
301 }
302 DEFINE_SHOW_ATTRIBUTE(dmar_translation_struct);
303 
304 static inline unsigned long level_to_directory_size(int level)
305 {
306 	return BIT_ULL(VTD_PAGE_SHIFT + VTD_STRIDE_SHIFT * (level - 1));
307 }
308 
309 static inline void
310 dump_page_info(struct seq_file *m, unsigned long iova, u64 *path)
311 {
312 	seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\n",
313 		   iova >> VTD_PAGE_SHIFT, path[5], path[4],
314 		   path[3], path[2], path[1]);
315 }
316 
317 static void pgtable_walk_level(struct seq_file *m, struct dma_pte *pde,
318 			       int level, unsigned long start,
319 			       u64 *path)
320 {
321 	int i;
322 
323 	if (level > 5 || level < 1)
324 		return;
325 
326 	for (i = 0; i < BIT_ULL(VTD_STRIDE_SHIFT);
327 			i++, pde++, start += level_to_directory_size(level)) {
328 		if (!dma_pte_present(pde))
329 			continue;
330 
331 		path[level] = pde->val;
332 		if (dma_pte_superpage(pde) || level == 1)
333 			dump_page_info(m, start, path);
334 		else
335 			pgtable_walk_level(m, phys_to_virt(dma_pte_addr(pde)),
336 					   level - 1, start, path);
337 		path[level] = 0;
338 	}
339 }
340 
341 static int show_device_domain_translation(struct device *dev, void *data)
342 {
343 	struct dmar_domain *domain = find_domain(dev);
344 	struct seq_file *m = data;
345 	u64 path[6] = { 0 };
346 
347 	if (!domain)
348 		return 0;
349 
350 	seq_printf(m, "Device %s with pasid %d @0x%llx\n",
351 		   dev_name(dev), domain->default_pasid,
352 		   (u64)virt_to_phys(domain->pgd));
353 	seq_puts(m, "IOVA_PFN\t\tPML5E\t\t\tPML4E\t\t\tPDPE\t\t\tPDE\t\t\tPTE\n");
354 
355 	pgtable_walk_level(m, domain->pgd, domain->agaw + 2, 0, path);
356 	seq_putc(m, '\n');
357 
358 	return 0;
359 }
360 
361 static int domain_translation_struct_show(struct seq_file *m, void *unused)
362 {
363 	unsigned long flags;
364 	int ret;
365 
366 	spin_lock_irqsave(&device_domain_lock, flags);
367 	ret = bus_for_each_dev(&pci_bus_type, NULL, m,
368 			       show_device_domain_translation);
369 	spin_unlock_irqrestore(&device_domain_lock, flags);
370 
371 	return ret;
372 }
373 DEFINE_SHOW_ATTRIBUTE(domain_translation_struct);
374 
375 static void invalidation_queue_entry_show(struct seq_file *m,
376 					  struct intel_iommu *iommu)
377 {
378 	int index, shift = qi_shift(iommu);
379 	struct qi_desc *desc;
380 	int offset;
381 
382 	if (ecap_smts(iommu->ecap))
383 		seq_puts(m, "Index\t\tqw0\t\t\tqw1\t\t\tqw2\t\t\tqw3\t\t\tstatus\n");
384 	else
385 		seq_puts(m, "Index\t\tqw0\t\t\tqw1\t\t\tstatus\n");
386 
387 	for (index = 0; index < QI_LENGTH; index++) {
388 		offset = index << shift;
389 		desc = iommu->qi->desc + offset;
390 		if (ecap_smts(iommu->ecap))
391 			seq_printf(m, "%5d\t%016llx\t%016llx\t%016llx\t%016llx\t%016x\n",
392 				   index, desc->qw0, desc->qw1,
393 				   desc->qw2, desc->qw3,
394 				   iommu->qi->desc_status[index]);
395 		else
396 			seq_printf(m, "%5d\t%016llx\t%016llx\t%016x\n",
397 				   index, desc->qw0, desc->qw1,
398 				   iommu->qi->desc_status[index]);
399 	}
400 }
401 
402 static int invalidation_queue_show(struct seq_file *m, void *unused)
403 {
404 	struct dmar_drhd_unit *drhd;
405 	struct intel_iommu *iommu;
406 	unsigned long flags;
407 	struct q_inval *qi;
408 	int shift;
409 
410 	rcu_read_lock();
411 	for_each_active_iommu(iommu, drhd) {
412 		qi = iommu->qi;
413 		shift = qi_shift(iommu);
414 
415 		if (!qi || !ecap_qis(iommu->ecap))
416 			continue;
417 
418 		seq_printf(m, "Invalidation queue on IOMMU: %s\n", iommu->name);
419 
420 		raw_spin_lock_irqsave(&qi->q_lock, flags);
421 		seq_printf(m, " Base: 0x%llx\tHead: %lld\tTail: %lld\n",
422 			   (u64)virt_to_phys(qi->desc),
423 			   dmar_readq(iommu->reg + DMAR_IQH_REG) >> shift,
424 			   dmar_readq(iommu->reg + DMAR_IQT_REG) >> shift);
425 		invalidation_queue_entry_show(m, iommu);
426 		raw_spin_unlock_irqrestore(&qi->q_lock, flags);
427 		seq_putc(m, '\n');
428 	}
429 	rcu_read_unlock();
430 
431 	return 0;
432 }
433 DEFINE_SHOW_ATTRIBUTE(invalidation_queue);
434 
435 #ifdef CONFIG_IRQ_REMAP
436 static void ir_tbl_remap_entry_show(struct seq_file *m,
437 				    struct intel_iommu *iommu)
438 {
439 	struct irte *ri_entry;
440 	unsigned long flags;
441 	int idx;
442 
443 	seq_puts(m, " Entry SrcID   DstID    Vct IRTE_high\t\tIRTE_low\n");
444 
445 	raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
446 	for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
447 		ri_entry = &iommu->ir_table->base[idx];
448 		if (!ri_entry->present || ri_entry->p_pst)
449 			continue;
450 
451 		seq_printf(m, " %-5d %02x:%02x.%01x %08x %02x  %016llx\t%016llx\n",
452 			   idx, PCI_BUS_NUM(ri_entry->sid),
453 			   PCI_SLOT(ri_entry->sid), PCI_FUNC(ri_entry->sid),
454 			   ri_entry->dest_id, ri_entry->vector,
455 			   ri_entry->high, ri_entry->low);
456 	}
457 	raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
458 }
459 
460 static void ir_tbl_posted_entry_show(struct seq_file *m,
461 				     struct intel_iommu *iommu)
462 {
463 	struct irte *pi_entry;
464 	unsigned long flags;
465 	int idx;
466 
467 	seq_puts(m, " Entry SrcID   PDA_high PDA_low  Vct IRTE_high\t\tIRTE_low\n");
468 
469 	raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
470 	for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
471 		pi_entry = &iommu->ir_table->base[idx];
472 		if (!pi_entry->present || !pi_entry->p_pst)
473 			continue;
474 
475 		seq_printf(m, " %-5d %02x:%02x.%01x %08x %08x %02x  %016llx\t%016llx\n",
476 			   idx, PCI_BUS_NUM(pi_entry->sid),
477 			   PCI_SLOT(pi_entry->sid), PCI_FUNC(pi_entry->sid),
478 			   pi_entry->pda_h, pi_entry->pda_l << 6,
479 			   pi_entry->vector, pi_entry->high,
480 			   pi_entry->low);
481 	}
482 	raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
483 }
484 
485 /*
486  * For active IOMMUs go through the Interrupt remapping
487  * table and print valid entries in a table format for
488  * Remapped and Posted Interrupts.
489  */
490 static int ir_translation_struct_show(struct seq_file *m, void *unused)
491 {
492 	struct dmar_drhd_unit *drhd;
493 	struct intel_iommu *iommu;
494 	u64 irta;
495 	u32 sts;
496 
497 	rcu_read_lock();
498 	for_each_active_iommu(iommu, drhd) {
499 		if (!ecap_ir_support(iommu->ecap))
500 			continue;
501 
502 		seq_printf(m, "Remapped Interrupt supported on IOMMU: %s\n",
503 			   iommu->name);
504 
505 		sts = dmar_readl(iommu->reg + DMAR_GSTS_REG);
506 		if (iommu->ir_table && (sts & DMA_GSTS_IRES)) {
507 			irta = virt_to_phys(iommu->ir_table->base);
508 			seq_printf(m, " IR table address:%llx\n", irta);
509 			ir_tbl_remap_entry_show(m, iommu);
510 		} else {
511 			seq_puts(m, "Interrupt Remapping is not enabled\n");
512 		}
513 		seq_putc(m, '\n');
514 	}
515 
516 	seq_puts(m, "****\n\n");
517 
518 	for_each_active_iommu(iommu, drhd) {
519 		if (!cap_pi_support(iommu->cap))
520 			continue;
521 
522 		seq_printf(m, "Posted Interrupt supported on IOMMU: %s\n",
523 			   iommu->name);
524 
525 		if (iommu->ir_table) {
526 			irta = virt_to_phys(iommu->ir_table->base);
527 			seq_printf(m, " IR table address:%llx\n", irta);
528 			ir_tbl_posted_entry_show(m, iommu);
529 		} else {
530 			seq_puts(m, "Interrupt Remapping is not enabled\n");
531 		}
532 		seq_putc(m, '\n');
533 	}
534 	rcu_read_unlock();
535 
536 	return 0;
537 }
538 DEFINE_SHOW_ATTRIBUTE(ir_translation_struct);
539 #endif
540 
541 void __init intel_iommu_debugfs_init(void)
542 {
543 	struct dentry *intel_iommu_debug = debugfs_create_dir("intel",
544 						iommu_debugfs_dir);
545 
546 	debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL,
547 			    &iommu_regset_fops);
548 	debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug,
549 			    NULL, &dmar_translation_struct_fops);
550 	debugfs_create_file("domain_translation_struct", 0444,
551 			    intel_iommu_debug, NULL,
552 			    &domain_translation_struct_fops);
553 	debugfs_create_file("invalidation_queue", 0444, intel_iommu_debug,
554 			    NULL, &invalidation_queue_fops);
555 #ifdef CONFIG_IRQ_REMAP
556 	debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug,
557 			    NULL, &ir_translation_struct_fops);
558 #endif
559 }
560