1 /*
2  * Copyright 2018 Advanced Micro Devices, Inc.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sub license, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
20  *
21  * The above copyright notice and this permission notice (including the
22  * next paragraph) shall be included in all copies or substantial portions
23  * of the Software.
24  *
25  */
26 
27 #include <linux/io-64-nonatomic-lo-hi.h>
28 #ifdef CONFIG_X86
29 #include <asm/hypervisor.h>
30 #endif
31 
32 #include "amdgpu.h"
33 #include "amdgpu_gmc.h"
34 #include "amdgpu_ras.h"
35 #include "amdgpu_xgmi.h"
36 
37 #include <drm/drm_drv.h>
38 #include <drm/ttm/ttm_tt.h>
39 
40 /**
41  * amdgpu_gmc_pdb0_alloc - allocate vram for pdb0
42  *
43  * @adev: amdgpu_device pointer
44  *
45  * Allocate video memory for pdb0 and map it for CPU access
46  * Returns 0 for success, error for failure.
47  */
48 int amdgpu_gmc_pdb0_alloc(struct amdgpu_device *adev)
49 {
50 	int r;
51 	struct amdgpu_bo_param bp;
52 	u64 vram_size = adev->gmc.xgmi.node_segment_size * adev->gmc.xgmi.num_physical_nodes;
53 	uint32_t pde0_page_shift = adev->gmc.vmid0_page_table_block_size + 21;
54 	uint32_t npdes = (vram_size + (1ULL << pde0_page_shift) -1) >> pde0_page_shift;
55 
56 	memset(&bp, 0, sizeof(bp));
57 	bp.size = PAGE_ALIGN((npdes + 1) * 8);
58 	bp.byte_align = PAGE_SIZE;
59 	bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
60 	bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
61 		AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
62 	bp.type = ttm_bo_type_kernel;
63 	bp.resv = NULL;
64 	bp.bo_ptr_size = sizeof(struct amdgpu_bo);
65 
66 	r = amdgpu_bo_create(adev, &bp, &adev->gmc.pdb0_bo);
67 	if (r)
68 		return r;
69 
70 	r = amdgpu_bo_reserve(adev->gmc.pdb0_bo, false);
71 	if (unlikely(r != 0))
72 		goto bo_reserve_failure;
73 
74 	r = amdgpu_bo_pin(adev->gmc.pdb0_bo, AMDGPU_GEM_DOMAIN_VRAM);
75 	if (r)
76 		goto bo_pin_failure;
77 	r = amdgpu_bo_kmap(adev->gmc.pdb0_bo, &adev->gmc.ptr_pdb0);
78 	if (r)
79 		goto bo_kmap_failure;
80 
81 	amdgpu_bo_unreserve(adev->gmc.pdb0_bo);
82 	return 0;
83 
84 bo_kmap_failure:
85 	amdgpu_bo_unpin(adev->gmc.pdb0_bo);
86 bo_pin_failure:
87 	amdgpu_bo_unreserve(adev->gmc.pdb0_bo);
88 bo_reserve_failure:
89 	amdgpu_bo_unref(&adev->gmc.pdb0_bo);
90 	return r;
91 }
92 
93 /**
94  * amdgpu_gmc_get_pde_for_bo - get the PDE for a BO
95  *
96  * @bo: the BO to get the PDE for
97  * @level: the level in the PD hirarchy
98  * @addr: resulting addr
99  * @flags: resulting flags
100  *
101  * Get the address and flags to be used for a PDE (Page Directory Entry).
102  */
103 void amdgpu_gmc_get_pde_for_bo(struct amdgpu_bo *bo, int level,
104 			       uint64_t *addr, uint64_t *flags)
105 {
106 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
107 
108 	switch (bo->tbo.resource->mem_type) {
109 	case TTM_PL_TT:
110 		*addr = bo->tbo.ttm->dma_address[0];
111 		break;
112 	case TTM_PL_VRAM:
113 		*addr = amdgpu_bo_gpu_offset(bo);
114 		break;
115 	default:
116 		*addr = 0;
117 		break;
118 	}
119 	*flags = amdgpu_ttm_tt_pde_flags(bo->tbo.ttm, bo->tbo.resource);
120 	amdgpu_gmc_get_vm_pde(adev, level, addr, flags);
121 }
122 
123 /*
124  * amdgpu_gmc_pd_addr - return the address of the root directory
125  */
126 uint64_t amdgpu_gmc_pd_addr(struct amdgpu_bo *bo)
127 {
128 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
129 	uint64_t pd_addr;
130 
131 	/* TODO: move that into ASIC specific code */
132 	if (adev->asic_type >= CHIP_VEGA10) {
133 		uint64_t flags = AMDGPU_PTE_VALID;
134 
135 		amdgpu_gmc_get_pde_for_bo(bo, -1, &pd_addr, &flags);
136 		pd_addr |= flags;
137 	} else {
138 		pd_addr = amdgpu_bo_gpu_offset(bo);
139 	}
140 	return pd_addr;
141 }
142 
143 /**
144  * amdgpu_gmc_set_pte_pde - update the page tables using CPU
145  *
146  * @adev: amdgpu_device pointer
147  * @cpu_pt_addr: cpu address of the page table
148  * @gpu_page_idx: entry in the page table to update
149  * @addr: dst addr to write into pte/pde
150  * @flags: access flags
151  *
152  * Update the page tables using CPU.
153  */
154 int amdgpu_gmc_set_pte_pde(struct amdgpu_device *adev, void *cpu_pt_addr,
155 				uint32_t gpu_page_idx, uint64_t addr,
156 				uint64_t flags)
157 {
158 	void __iomem *ptr = (void *)cpu_pt_addr;
159 	uint64_t value;
160 
161 	/*
162 	 * The following is for PTE only. GART does not have PDEs.
163 	*/
164 	value = addr & 0x0000FFFFFFFFF000ULL;
165 	value |= flags;
166 	writeq(value, ptr + (gpu_page_idx * 8));
167 
168 	return 0;
169 }
170 
171 /**
172  * amdgpu_gmc_agp_addr - return the address in the AGP address space
173  *
174  * @bo: TTM BO which needs the address, must be in GTT domain
175  *
176  * Tries to figure out how to access the BO through the AGP aperture. Returns
177  * AMDGPU_BO_INVALID_OFFSET if that is not possible.
178  */
179 uint64_t amdgpu_gmc_agp_addr(struct ttm_buffer_object *bo)
180 {
181 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
182 
183 	if (bo->ttm->num_pages != 1 || bo->ttm->caching == ttm_cached)
184 		return AMDGPU_BO_INVALID_OFFSET;
185 
186 	if (bo->ttm->dma_address[0] + PAGE_SIZE >= adev->gmc.agp_size)
187 		return AMDGPU_BO_INVALID_OFFSET;
188 
189 	return adev->gmc.agp_start + bo->ttm->dma_address[0];
190 }
191 
192 /**
193  * amdgpu_gmc_vram_location - try to find VRAM location
194  *
195  * @adev: amdgpu device structure holding all necessary information
196  * @mc: memory controller structure holding memory information
197  * @base: base address at which to put VRAM
198  *
199  * Function will try to place VRAM at base address provided
200  * as parameter.
201  */
202 void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
203 			      u64 base)
204 {
205 	uint64_t vis_limit = (uint64_t)amdgpu_vis_vram_limit << 20;
206 	uint64_t limit = (uint64_t)amdgpu_vram_limit << 20;
207 
208 	mc->vram_start = base;
209 	mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
210 	if (limit < mc->real_vram_size)
211 		mc->real_vram_size = limit;
212 
213 	if (vis_limit && vis_limit < mc->visible_vram_size)
214 		mc->visible_vram_size = vis_limit;
215 
216 	if (mc->real_vram_size < mc->visible_vram_size)
217 		mc->visible_vram_size = mc->real_vram_size;
218 
219 	if (mc->xgmi.num_physical_nodes == 0) {
220 		mc->fb_start = mc->vram_start;
221 		mc->fb_end = mc->vram_end;
222 	}
223 	dev_info(adev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
224 			mc->mc_vram_size >> 20, mc->vram_start,
225 			mc->vram_end, mc->real_vram_size >> 20);
226 }
227 
228 /** amdgpu_gmc_sysvm_location - place vram and gart in sysvm aperture
229  *
230  * @adev: amdgpu device structure holding all necessary information
231  * @mc: memory controller structure holding memory information
232  *
233  * This function is only used if use GART for FB translation. In such
234  * case, we use sysvm aperture (vmid0 page tables) for both vram
235  * and gart (aka system memory) access.
236  *
237  * GPUVM (and our organization of vmid0 page tables) require sysvm
238  * aperture to be placed at a location aligned with 8 times of native
239  * page size. For example, if vm_context0_cntl.page_table_block_size
240  * is 12, then native page size is 8G (2M*2^12), sysvm should start
241  * with a 64G aligned address. For simplicity, we just put sysvm at
242  * address 0. So vram start at address 0 and gart is right after vram.
243  */
244 void amdgpu_gmc_sysvm_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
245 {
246 	u64 hive_vram_start = 0;
247 	u64 hive_vram_end = mc->xgmi.node_segment_size * mc->xgmi.num_physical_nodes - 1;
248 	mc->vram_start = mc->xgmi.node_segment_size * mc->xgmi.physical_node_id;
249 	mc->vram_end = mc->vram_start + mc->xgmi.node_segment_size - 1;
250 	mc->gart_start = hive_vram_end + 1;
251 	mc->gart_end = mc->gart_start + mc->gart_size - 1;
252 	mc->fb_start = hive_vram_start;
253 	mc->fb_end = hive_vram_end;
254 	dev_info(adev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
255 			mc->mc_vram_size >> 20, mc->vram_start,
256 			mc->vram_end, mc->real_vram_size >> 20);
257 	dev_info(adev->dev, "GART: %lluM 0x%016llX - 0x%016llX\n",
258 			mc->gart_size >> 20, mc->gart_start, mc->gart_end);
259 }
260 
261 /**
262  * amdgpu_gmc_gart_location - try to find GART location
263  *
264  * @adev: amdgpu device structure holding all necessary information
265  * @mc: memory controller structure holding memory information
266  *
267  * Function will place try to place GART before or after VRAM.
268  * If GART size is bigger than space left then we ajust GART size.
269  * Thus function will never fails.
270  */
271 void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
272 {
273 	const uint64_t four_gb = 0x100000000ULL;
274 	u64 size_af, size_bf;
275 	/*To avoid the hole, limit the max mc address to AMDGPU_GMC_HOLE_START*/
276 	u64 max_mc_address = min(adev->gmc.mc_mask, AMDGPU_GMC_HOLE_START - 1);
277 
278 	/* VCE doesn't like it when BOs cross a 4GB segment, so align
279 	 * the GART base on a 4GB boundary as well.
280 	 */
281 	size_bf = mc->fb_start;
282 	size_af = max_mc_address + 1 - ALIGN(mc->fb_end + 1, four_gb);
283 
284 	if (mc->gart_size > max(size_bf, size_af)) {
285 		dev_warn(adev->dev, "limiting GART\n");
286 		mc->gart_size = max(size_bf, size_af);
287 	}
288 
289 	if ((size_bf >= mc->gart_size && size_bf < size_af) ||
290 	    (size_af < mc->gart_size))
291 		mc->gart_start = 0;
292 	else
293 		mc->gart_start = max_mc_address - mc->gart_size + 1;
294 
295 	mc->gart_start &= ~(four_gb - 1);
296 	mc->gart_end = mc->gart_start + mc->gart_size - 1;
297 	dev_info(adev->dev, "GART: %lluM 0x%016llX - 0x%016llX\n",
298 			mc->gart_size >> 20, mc->gart_start, mc->gart_end);
299 }
300 
301 /**
302  * amdgpu_gmc_agp_location - try to find AGP location
303  * @adev: amdgpu device structure holding all necessary information
304  * @mc: memory controller structure holding memory information
305  *
306  * Function will place try to find a place for the AGP BAR in the MC address
307  * space.
308  *
309  * AGP BAR will be assigned the largest available hole in the address space.
310  * Should be called after VRAM and GART locations are setup.
311  */
312 void amdgpu_gmc_agp_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
313 {
314 	const uint64_t sixteen_gb = 1ULL << 34;
315 	const uint64_t sixteen_gb_mask = ~(sixteen_gb - 1);
316 	u64 size_af, size_bf;
317 
318 	if (amdgpu_sriov_vf(adev)) {
319 		mc->agp_start = 0xffffffffffff;
320 		mc->agp_end = 0x0;
321 		mc->agp_size = 0;
322 
323 		return;
324 	}
325 
326 	if (mc->fb_start > mc->gart_start) {
327 		size_bf = (mc->fb_start & sixteen_gb_mask) -
328 			ALIGN(mc->gart_end + 1, sixteen_gb);
329 		size_af = mc->mc_mask + 1 - ALIGN(mc->fb_end + 1, sixteen_gb);
330 	} else {
331 		size_bf = mc->fb_start & sixteen_gb_mask;
332 		size_af = (mc->gart_start & sixteen_gb_mask) -
333 			ALIGN(mc->fb_end + 1, sixteen_gb);
334 	}
335 
336 	if (size_bf > size_af) {
337 		mc->agp_start = (mc->fb_start - size_bf) & sixteen_gb_mask;
338 		mc->agp_size = size_bf;
339 	} else {
340 		mc->agp_start = ALIGN(mc->fb_end + 1, sixteen_gb);
341 		mc->agp_size = size_af;
342 	}
343 
344 	mc->agp_end = mc->agp_start + mc->agp_size - 1;
345 	dev_info(adev->dev, "AGP: %lluM 0x%016llX - 0x%016llX\n",
346 			mc->agp_size >> 20, mc->agp_start, mc->agp_end);
347 }
348 
349 /**
350  * amdgpu_gmc_fault_key - get hask key from vm fault address and pasid
351  *
352  * @addr: 48 bit physical address, page aligned (36 significant bits)
353  * @pasid: 16 bit process address space identifier
354  */
355 static inline uint64_t amdgpu_gmc_fault_key(uint64_t addr, uint16_t pasid)
356 {
357 	return addr << 4 | pasid;
358 }
359 
360 /**
361  * amdgpu_gmc_filter_faults - filter VM faults
362  *
363  * @adev: amdgpu device structure
364  * @ih: interrupt ring that the fault received from
365  * @addr: address of the VM fault
366  * @pasid: PASID of the process causing the fault
367  * @timestamp: timestamp of the fault
368  *
369  * Returns:
370  * True if the fault was filtered and should not be processed further.
371  * False if the fault is a new one and needs to be handled.
372  */
373 bool amdgpu_gmc_filter_faults(struct amdgpu_device *adev,
374 			      struct amdgpu_ih_ring *ih, uint64_t addr,
375 			      uint16_t pasid, uint64_t timestamp)
376 {
377 	struct amdgpu_gmc *gmc = &adev->gmc;
378 	uint64_t stamp, key = amdgpu_gmc_fault_key(addr, pasid);
379 	struct amdgpu_gmc_fault *fault;
380 	uint32_t hash;
381 
382 	/* Stale retry fault if timestamp goes backward */
383 	if (amdgpu_ih_ts_after(timestamp, ih->processed_timestamp))
384 		return true;
385 
386 	/* If we don't have space left in the ring buffer return immediately */
387 	stamp = max(timestamp, AMDGPU_GMC_FAULT_TIMEOUT + 1) -
388 		AMDGPU_GMC_FAULT_TIMEOUT;
389 	if (gmc->fault_ring[gmc->last_fault].timestamp >= stamp)
390 		return true;
391 
392 	/* Try to find the fault in the hash */
393 	hash = hash_64(key, AMDGPU_GMC_FAULT_HASH_ORDER);
394 	fault = &gmc->fault_ring[gmc->fault_hash[hash].idx];
395 	while (fault->timestamp >= stamp) {
396 		uint64_t tmp;
397 
398 		if (atomic64_read(&fault->key) == key) {
399 			/*
400 			 * if we get a fault which is already present in
401 			 * the fault_ring and the timestamp of
402 			 * the fault is after the expired timestamp,
403 			 * then this is a new fault that needs to be added
404 			 * into the fault ring.
405 			 */
406 			if (fault->timestamp_expiry != 0 &&
407 			    amdgpu_ih_ts_after(fault->timestamp_expiry,
408 					       timestamp))
409 				break;
410 			else
411 				return true;
412 		}
413 
414 		tmp = fault->timestamp;
415 		fault = &gmc->fault_ring[fault->next];
416 
417 		/* Check if the entry was reused */
418 		if (fault->timestamp >= tmp)
419 			break;
420 	}
421 
422 	/* Add the fault to the ring */
423 	fault = &gmc->fault_ring[gmc->last_fault];
424 	atomic64_set(&fault->key, key);
425 	fault->timestamp = timestamp;
426 
427 	/* And update the hash */
428 	fault->next = gmc->fault_hash[hash].idx;
429 	gmc->fault_hash[hash].idx = gmc->last_fault++;
430 	return false;
431 }
432 
433 /**
434  * amdgpu_gmc_filter_faults_remove - remove address from VM faults filter
435  *
436  * @adev: amdgpu device structure
437  * @addr: address of the VM fault
438  * @pasid: PASID of the process causing the fault
439  *
440  * Remove the address from fault filter, then future vm fault on this address
441  * will pass to retry fault handler to recover.
442  */
443 void amdgpu_gmc_filter_faults_remove(struct amdgpu_device *adev, uint64_t addr,
444 				     uint16_t pasid)
445 {
446 	struct amdgpu_gmc *gmc = &adev->gmc;
447 	uint64_t key = amdgpu_gmc_fault_key(addr, pasid);
448 	struct amdgpu_ih_ring *ih;
449 	struct amdgpu_gmc_fault *fault;
450 	uint32_t last_wptr;
451 	uint64_t last_ts;
452 	uint32_t hash;
453 	uint64_t tmp;
454 
455 	ih = adev->irq.retry_cam_enabled ? &adev->irq.ih_soft : &adev->irq.ih1;
456 	/* Get the WPTR of the last entry in IH ring */
457 	last_wptr = amdgpu_ih_get_wptr(adev, ih);
458 	/* Order wptr with ring data. */
459 	rmb();
460 	/* Get the timetamp of the last entry in IH ring */
461 	last_ts = amdgpu_ih_decode_iv_ts(adev, ih, last_wptr, -1);
462 
463 	hash = hash_64(key, AMDGPU_GMC_FAULT_HASH_ORDER);
464 	fault = &gmc->fault_ring[gmc->fault_hash[hash].idx];
465 	do {
466 		if (atomic64_read(&fault->key) == key) {
467 			/*
468 			 * Update the timestamp when this fault
469 			 * expired.
470 			 */
471 			fault->timestamp_expiry = last_ts;
472 			break;
473 		}
474 
475 		tmp = fault->timestamp;
476 		fault = &gmc->fault_ring[fault->next];
477 	} while (fault->timestamp < tmp);
478 }
479 
480 int amdgpu_gmc_ras_sw_init(struct amdgpu_device *adev)
481 {
482 	int r;
483 
484 	/* umc ras block */
485 	r = amdgpu_umc_ras_sw_init(adev);
486 	if (r)
487 		return r;
488 
489 	/* mmhub ras block */
490 	r = amdgpu_mmhub_ras_sw_init(adev);
491 	if (r)
492 		return r;
493 
494 	/* hdp ras block */
495 	r = amdgpu_hdp_ras_sw_init(adev);
496 	if (r)
497 		return r;
498 
499 	/* mca.x ras block */
500 	r = amdgpu_mca_mp0_ras_sw_init(adev);
501 	if (r)
502 		return r;
503 
504 	r = amdgpu_mca_mp1_ras_sw_init(adev);
505 	if (r)
506 		return r;
507 
508 	r = amdgpu_mca_mpio_ras_sw_init(adev);
509 	if (r)
510 		return r;
511 
512 	/* xgmi ras block */
513 	r = amdgpu_xgmi_ras_sw_init(adev);
514 	if (r)
515 		return r;
516 
517 	return 0;
518 }
519 
520 int amdgpu_gmc_ras_late_init(struct amdgpu_device *adev)
521 {
522 	return 0;
523 }
524 
525 void amdgpu_gmc_ras_fini(struct amdgpu_device *adev)
526 {
527 
528 }
529 
530 	/*
531 	 * The latest engine allocation on gfx9/10 is:
532 	 * Engine 2, 3: firmware
533 	 * Engine 0, 1, 4~16: amdgpu ring,
534 	 *                    subject to change when ring number changes
535 	 * Engine 17: Gart flushes
536 	 */
537 #define GFXHUB_FREE_VM_INV_ENGS_BITMAP		0x1FFF3
538 #define MMHUB_FREE_VM_INV_ENGS_BITMAP		0x1FFF3
539 
540 int amdgpu_gmc_allocate_vm_inv_eng(struct amdgpu_device *adev)
541 {
542 	struct amdgpu_ring *ring;
543 	unsigned vm_inv_engs[AMDGPU_MAX_VMHUBS] =
544 		{GFXHUB_FREE_VM_INV_ENGS_BITMAP, MMHUB_FREE_VM_INV_ENGS_BITMAP,
545 		GFXHUB_FREE_VM_INV_ENGS_BITMAP};
546 	unsigned i;
547 	unsigned vmhub, inv_eng;
548 
549 	if (adev->enable_mes) {
550 		/* reserve engine 5 for firmware */
551 		for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++)
552 			vm_inv_engs[vmhub] &= ~(1 << 5);
553 	}
554 
555 	for (i = 0; i < adev->num_rings; ++i) {
556 		ring = adev->rings[i];
557 		vmhub = ring->vm_hub;
558 
559 		if (ring == &adev->mes.ring)
560 			continue;
561 
562 		inv_eng = ffs(vm_inv_engs[vmhub]);
563 		if (!inv_eng) {
564 			dev_err(adev->dev, "no VM inv eng for ring %s\n",
565 				ring->name);
566 			return -EINVAL;
567 		}
568 
569 		ring->vm_inv_eng = inv_eng - 1;
570 		vm_inv_engs[vmhub] &= ~(1 << ring->vm_inv_eng);
571 
572 		dev_info(adev->dev, "ring %s uses VM inv eng %u on hub %u\n",
573 			 ring->name, ring->vm_inv_eng, ring->vm_hub);
574 	}
575 
576 	return 0;
577 }
578 
579 /**
580  * amdgpu_gmc_tmz_set -- check and set if a device supports TMZ
581  * @adev: amdgpu_device pointer
582  *
583  * Check and set if an the device @adev supports Trusted Memory
584  * Zones (TMZ).
585  */
586 void amdgpu_gmc_tmz_set(struct amdgpu_device *adev)
587 {
588 	switch (adev->ip_versions[GC_HWIP][0]) {
589 	/* RAVEN */
590 	case IP_VERSION(9, 2, 2):
591 	case IP_VERSION(9, 1, 0):
592 	/* RENOIR looks like RAVEN */
593 	case IP_VERSION(9, 3, 0):
594 	/* GC 10.3.7 */
595 	case IP_VERSION(10, 3, 7):
596 		if (amdgpu_tmz == 0) {
597 			adev->gmc.tmz_enabled = false;
598 			dev_info(adev->dev,
599 				 "Trusted Memory Zone (TMZ) feature disabled (cmd line)\n");
600 		} else {
601 			adev->gmc.tmz_enabled = true;
602 			dev_info(adev->dev,
603 				 "Trusted Memory Zone (TMZ) feature enabled\n");
604 		}
605 		break;
606 	case IP_VERSION(10, 1, 10):
607 	case IP_VERSION(10, 1, 1):
608 	case IP_VERSION(10, 1, 2):
609 	case IP_VERSION(10, 1, 3):
610 	case IP_VERSION(10, 3, 0):
611 	case IP_VERSION(10, 3, 2):
612 	case IP_VERSION(10, 3, 4):
613 	case IP_VERSION(10, 3, 5):
614 	case IP_VERSION(10, 3, 6):
615 	/* VANGOGH */
616 	case IP_VERSION(10, 3, 1):
617 	/* YELLOW_CARP*/
618 	case IP_VERSION(10, 3, 3):
619 	case IP_VERSION(11, 0, 1):
620 	case IP_VERSION(11, 0, 4):
621 		/* Don't enable it by default yet.
622 		 */
623 		if (amdgpu_tmz < 1) {
624 			adev->gmc.tmz_enabled = false;
625 			dev_info(adev->dev,
626 				 "Trusted Memory Zone (TMZ) feature disabled as experimental (default)\n");
627 		} else {
628 			adev->gmc.tmz_enabled = true;
629 			dev_info(adev->dev,
630 				 "Trusted Memory Zone (TMZ) feature enabled as experimental (cmd line)\n");
631 		}
632 		break;
633 	default:
634 		adev->gmc.tmz_enabled = false;
635 		dev_info(adev->dev,
636 			 "Trusted Memory Zone (TMZ) feature not supported\n");
637 		break;
638 	}
639 }
640 
641 /**
642  * amdgpu_gmc_noretry_set -- set per asic noretry defaults
643  * @adev: amdgpu_device pointer
644  *
645  * Set a per asic default for the no-retry parameter.
646  *
647  */
648 void amdgpu_gmc_noretry_set(struct amdgpu_device *adev)
649 {
650 	struct amdgpu_gmc *gmc = &adev->gmc;
651 	uint32_t gc_ver = adev->ip_versions[GC_HWIP][0];
652 	bool noretry_default = (gc_ver == IP_VERSION(9, 0, 1) ||
653 				gc_ver == IP_VERSION(9, 3, 0) ||
654 				gc_ver == IP_VERSION(9, 4, 0) ||
655 				gc_ver == IP_VERSION(9, 4, 1) ||
656 				gc_ver == IP_VERSION(9, 4, 2) ||
657 				gc_ver == IP_VERSION(9, 4, 3) ||
658 				gc_ver >= IP_VERSION(10, 3, 0));
659 
660 	gmc->noretry = (amdgpu_noretry == -1) ? noretry_default : amdgpu_noretry;
661 }
662 
663 void amdgpu_gmc_set_vm_fault_masks(struct amdgpu_device *adev, int hub_type,
664 				   bool enable)
665 {
666 	struct amdgpu_vmhub *hub;
667 	u32 tmp, reg, i;
668 
669 	hub = &adev->vmhub[hub_type];
670 	for (i = 0; i < 16; i++) {
671 		reg = hub->vm_context0_cntl + hub->ctx_distance * i;
672 
673 		tmp = (hub_type == AMDGPU_GFXHUB_0) ?
674 			RREG32_SOC15_IP(GC, reg) :
675 			RREG32_SOC15_IP(MMHUB, reg);
676 
677 		if (enable)
678 			tmp |= hub->vm_cntx_cntl_vm_fault;
679 		else
680 			tmp &= ~hub->vm_cntx_cntl_vm_fault;
681 
682 		(hub_type == AMDGPU_GFXHUB_0) ?
683 			WREG32_SOC15_IP(GC, reg, tmp) :
684 			WREG32_SOC15_IP(MMHUB, reg, tmp);
685 	}
686 }
687 
688 void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev)
689 {
690 	unsigned size;
691 
692 	/*
693 	 * Some ASICs need to reserve a region of video memory to avoid access
694 	 * from driver
695 	 */
696 	adev->mman.stolen_reserved_offset = 0;
697 	adev->mman.stolen_reserved_size = 0;
698 
699 	/*
700 	 * TODO:
701 	 * Currently there is a bug where some memory client outside
702 	 * of the driver writes to first 8M of VRAM on S3 resume,
703 	 * this overrides GART which by default gets placed in first 8M and
704 	 * causes VM_FAULTS once GTT is accessed.
705 	 * Keep the stolen memory reservation until the while this is not solved.
706 	 */
707 	switch (adev->asic_type) {
708 	case CHIP_VEGA10:
709 		adev->mman.keep_stolen_vga_memory = true;
710 		/*
711 		 * VEGA10 SRIOV VF with MS_HYPERV host needs some firmware reserved area.
712 		 */
713 #ifdef CONFIG_X86
714 		if (amdgpu_sriov_vf(adev) && hypervisor_is_type(X86_HYPER_MS_HYPERV)) {
715 			adev->mman.stolen_reserved_offset = 0x500000;
716 			adev->mman.stolen_reserved_size = 0x200000;
717 		}
718 #endif
719 		break;
720 	case CHIP_RAVEN:
721 	case CHIP_RENOIR:
722 		adev->mman.keep_stolen_vga_memory = true;
723 		break;
724 	case CHIP_YELLOW_CARP:
725 		if (amdgpu_discovery == 0) {
726 			adev->mman.stolen_reserved_offset = 0x1ffb0000;
727 			adev->mman.stolen_reserved_size = 64 * PAGE_SIZE;
728 		}
729 		break;
730 	default:
731 		adev->mman.keep_stolen_vga_memory = false;
732 		break;
733 	}
734 
735 	if (amdgpu_sriov_vf(adev) ||
736 	    !amdgpu_device_has_display_hardware(adev)) {
737 		size = 0;
738 	} else {
739 		size = amdgpu_gmc_get_vbios_fb_size(adev);
740 
741 		if (adev->mman.keep_stolen_vga_memory)
742 			size = max(size, (unsigned)AMDGPU_VBIOS_VGA_ALLOCATION);
743 	}
744 
745 	/* set to 0 if the pre-OS buffer uses up most of vram */
746 	if ((adev->gmc.real_vram_size - size) < (8 * 1024 * 1024))
747 		size = 0;
748 
749 	if (size > AMDGPU_VBIOS_VGA_ALLOCATION) {
750 		adev->mman.stolen_vga_size = AMDGPU_VBIOS_VGA_ALLOCATION;
751 		adev->mman.stolen_extended_size = size - adev->mman.stolen_vga_size;
752 	} else {
753 		adev->mman.stolen_vga_size = size;
754 		adev->mman.stolen_extended_size = 0;
755 	}
756 }
757 
758 /**
759  * amdgpu_gmc_init_pdb0 - initialize PDB0
760  *
761  * @adev: amdgpu_device pointer
762  *
763  * This function is only used when GART page table is used
764  * for FB address translatioin. In such a case, we construct
765  * a 2-level system VM page table: PDB0->PTB, to cover both
766  * VRAM of the hive and system memory.
767  *
768  * PDB0 is static, initialized once on driver initialization.
769  * The first n entries of PDB0 are used as PTE by setting
770  * P bit to 1, pointing to VRAM. The n+1'th entry points
771  * to a big PTB covering system memory.
772  *
773  */
774 void amdgpu_gmc_init_pdb0(struct amdgpu_device *adev)
775 {
776 	int i;
777 	uint64_t flags = adev->gart.gart_pte_flags; //TODO it is UC. explore NC/RW?
778 	/* Each PDE0 (used as PTE) covers (2^vmid0_page_table_block_size)*2M
779 	 */
780 	u64 vram_size = adev->gmc.xgmi.node_segment_size * adev->gmc.xgmi.num_physical_nodes;
781 	u64 pde0_page_size = (1ULL<<adev->gmc.vmid0_page_table_block_size)<<21;
782 	u64 vram_addr = adev->vm_manager.vram_base_offset -
783 		adev->gmc.xgmi.physical_node_id * adev->gmc.xgmi.node_segment_size;
784 	u64 vram_end = vram_addr + vram_size;
785 	u64 gart_ptb_gpu_pa = amdgpu_gmc_vram_pa(adev, adev->gart.bo);
786 	int idx;
787 
788 	if (!drm_dev_enter(adev_to_drm(adev), &idx))
789 		return;
790 
791 	flags |= AMDGPU_PTE_VALID | AMDGPU_PTE_READABLE;
792 	flags |= AMDGPU_PTE_WRITEABLE;
793 	flags |= AMDGPU_PTE_SNOOPED;
794 	flags |= AMDGPU_PTE_FRAG((adev->gmc.vmid0_page_table_block_size + 9*1));
795 	flags |= AMDGPU_PDE_PTE;
796 
797 	/* The first n PDE0 entries are used as PTE,
798 	 * pointing to vram
799 	 */
800 	for (i = 0; vram_addr < vram_end; i++, vram_addr += pde0_page_size)
801 		amdgpu_gmc_set_pte_pde(adev, adev->gmc.ptr_pdb0, i, vram_addr, flags);
802 
803 	/* The n+1'th PDE0 entry points to a huge
804 	 * PTB who has more than 512 entries each
805 	 * pointing to a 4K system page
806 	 */
807 	flags = AMDGPU_PTE_VALID;
808 	flags |= AMDGPU_PDE_BFS(0) | AMDGPU_PTE_SNOOPED;
809 	/* Requires gart_ptb_gpu_pa to be 4K aligned */
810 	amdgpu_gmc_set_pte_pde(adev, adev->gmc.ptr_pdb0, i, gart_ptb_gpu_pa, flags);
811 	drm_dev_exit(idx);
812 }
813 
814 /**
815  * amdgpu_gmc_vram_mc2pa - calculate vram buffer's physical address from MC
816  * address
817  *
818  * @adev: amdgpu_device pointer
819  * @mc_addr: MC address of buffer
820  */
821 uint64_t amdgpu_gmc_vram_mc2pa(struct amdgpu_device *adev, uint64_t mc_addr)
822 {
823 	return mc_addr - adev->gmc.vram_start + adev->vm_manager.vram_base_offset;
824 }
825 
826 /**
827  * amdgpu_gmc_vram_pa - calculate vram buffer object's physical address from
828  * GPU's view
829  *
830  * @adev: amdgpu_device pointer
831  * @bo: amdgpu buffer object
832  */
833 uint64_t amdgpu_gmc_vram_pa(struct amdgpu_device *adev, struct amdgpu_bo *bo)
834 {
835 	return amdgpu_gmc_vram_mc2pa(adev, amdgpu_bo_gpu_offset(bo));
836 }
837 
838 /**
839  * amdgpu_gmc_vram_cpu_pa - calculate vram buffer object's physical address
840  * from CPU's view
841  *
842  * @adev: amdgpu_device pointer
843  * @bo: amdgpu buffer object
844  */
845 uint64_t amdgpu_gmc_vram_cpu_pa(struct amdgpu_device *adev, struct amdgpu_bo *bo)
846 {
847 	return amdgpu_bo_gpu_offset(bo) - adev->gmc.vram_start + adev->gmc.aper_base;
848 }
849 
850 int amdgpu_gmc_vram_checking(struct amdgpu_device *adev)
851 {
852 	struct amdgpu_bo *vram_bo = NULL;
853 	uint64_t vram_gpu = 0;
854 	void *vram_ptr = NULL;
855 
856 	int ret, size = 0x100000;
857 	uint8_t cptr[10];
858 
859 	ret = amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
860 				AMDGPU_GEM_DOMAIN_VRAM,
861 				&vram_bo,
862 				&vram_gpu,
863 				&vram_ptr);
864 	if (ret)
865 		return ret;
866 
867 	memset(vram_ptr, 0x86, size);
868 	memset(cptr, 0x86, 10);
869 
870 	/**
871 	 * Check the start, the mid, and the end of the memory if the content of
872 	 * each byte is the pattern "0x86". If yes, we suppose the vram bo is
873 	 * workable.
874 	 *
875 	 * Note: If check the each byte of whole 1M bo, it will cost too many
876 	 * seconds, so here, we just pick up three parts for emulation.
877 	 */
878 	ret = memcmp(vram_ptr, cptr, 10);
879 	if (ret)
880 		return ret;
881 
882 	ret = memcmp(vram_ptr + (size / 2), cptr, 10);
883 	if (ret)
884 		return ret;
885 
886 	ret = memcmp(vram_ptr + size - 10, cptr, 10);
887 	if (ret)
888 		return ret;
889 
890 	amdgpu_bo_free_kernel(&vram_bo, &vram_gpu,
891 			&vram_ptr);
892 
893 	return 0;
894 }
895