xref: /linux/drivers/accel/ivpu/ivpu_mmu_context.c (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2020-2023 Intel Corporation
4  */
5 
6 #include <linux/bitfield.h>
7 #include <linux/highmem.h>
8 #include <linux/set_memory.h>
9 #include <linux/vmalloc.h>
10 
11 #include <drm/drm_cache.h>
12 
13 #include "ivpu_drv.h"
14 #include "ivpu_hw.h"
15 #include "ivpu_mmu.h"
16 #include "ivpu_mmu_context.h"
17 
18 #define IVPU_MMU_VPU_ADDRESS_MASK        GENMASK(47, 12)
19 #define IVPU_MMU_PGD_INDEX_MASK          GENMASK(47, 39)
20 #define IVPU_MMU_PUD_INDEX_MASK          GENMASK(38, 30)
21 #define IVPU_MMU_PMD_INDEX_MASK          GENMASK(29, 21)
22 #define IVPU_MMU_PTE_INDEX_MASK          GENMASK(20, 12)
23 #define IVPU_MMU_ENTRY_FLAGS_MASK        (BIT(52) | GENMASK(11, 0))
24 #define IVPU_MMU_ENTRY_FLAG_CONT         BIT(52)
25 #define IVPU_MMU_ENTRY_FLAG_NG           BIT(11)
26 #define IVPU_MMU_ENTRY_FLAG_AF           BIT(10)
27 #define IVPU_MMU_ENTRY_FLAG_RO           BIT(7)
28 #define IVPU_MMU_ENTRY_FLAG_USER         BIT(6)
29 #define IVPU_MMU_ENTRY_FLAG_LLC_COHERENT BIT(2)
30 #define IVPU_MMU_ENTRY_FLAG_TYPE_PAGE    BIT(1)
31 #define IVPU_MMU_ENTRY_FLAG_VALID        BIT(0)
32 
33 #define IVPU_MMU_PAGE_SIZE       SZ_4K
34 #define IVPU_MMU_CONT_PAGES_SIZE (IVPU_MMU_PAGE_SIZE * 16)
35 #define IVPU_MMU_PTE_MAP_SIZE    (IVPU_MMU_PGTABLE_ENTRIES * IVPU_MMU_PAGE_SIZE)
36 #define IVPU_MMU_PMD_MAP_SIZE    (IVPU_MMU_PGTABLE_ENTRIES * IVPU_MMU_PTE_MAP_SIZE)
37 #define IVPU_MMU_PUD_MAP_SIZE    (IVPU_MMU_PGTABLE_ENTRIES * IVPU_MMU_PMD_MAP_SIZE)
38 #define IVPU_MMU_PGD_MAP_SIZE    (IVPU_MMU_PGTABLE_ENTRIES * IVPU_MMU_PUD_MAP_SIZE)
39 #define IVPU_MMU_PGTABLE_SIZE    (IVPU_MMU_PGTABLE_ENTRIES * sizeof(u64))
40 
41 #define IVPU_MMU_DUMMY_ADDRESS 0xdeadb000
42 #define IVPU_MMU_ENTRY_VALID   (IVPU_MMU_ENTRY_FLAG_TYPE_PAGE | IVPU_MMU_ENTRY_FLAG_VALID)
43 #define IVPU_MMU_ENTRY_INVALID (IVPU_MMU_DUMMY_ADDRESS & ~IVPU_MMU_ENTRY_FLAGS_MASK)
44 #define IVPU_MMU_ENTRY_MAPPED  (IVPU_MMU_ENTRY_FLAG_AF | IVPU_MMU_ENTRY_FLAG_USER | \
45 				IVPU_MMU_ENTRY_FLAG_NG | IVPU_MMU_ENTRY_VALID)
46 
47 static void *ivpu_pgtable_alloc_page(struct ivpu_device *vdev, dma_addr_t *dma)
48 {
49 	dma_addr_t dma_addr;
50 	struct page *page;
51 	void *cpu;
52 
53 	page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
54 	if (!page)
55 		return NULL;
56 
57 	set_pages_array_wc(&page, 1);
58 
59 	dma_addr = dma_map_page(vdev->drm.dev, page, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
60 	if (dma_mapping_error(vdev->drm.dev, dma_addr))
61 		goto err_free_page;
62 
63 	cpu = vmap(&page, 1, VM_MAP, pgprot_writecombine(PAGE_KERNEL));
64 	if (!cpu)
65 		goto err_dma_unmap_page;
66 
67 
68 	*dma = dma_addr;
69 	return cpu;
70 
71 err_dma_unmap_page:
72 	dma_unmap_page(vdev->drm.dev, dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
73 
74 err_free_page:
75 	put_page(page);
76 	return NULL;
77 }
78 
79 static void ivpu_pgtable_free_page(struct ivpu_device *vdev, u64 *cpu_addr, dma_addr_t dma_addr)
80 {
81 	struct page *page;
82 
83 	if (cpu_addr) {
84 		page = vmalloc_to_page(cpu_addr);
85 		vunmap(cpu_addr);
86 		dma_unmap_page(vdev->drm.dev, dma_addr & ~IVPU_MMU_ENTRY_FLAGS_MASK, PAGE_SIZE,
87 			       DMA_BIDIRECTIONAL);
88 		set_pages_array_wb(&page, 1);
89 		put_page(page);
90 	}
91 }
92 
93 static int ivpu_mmu_pgtable_init(struct ivpu_device *vdev, struct ivpu_mmu_pgtable *pgtable)
94 {
95 	dma_addr_t pgd_dma;
96 
97 	pgtable->pgd_dma_ptr = ivpu_pgtable_alloc_page(vdev, &pgd_dma);
98 	if (!pgtable->pgd_dma_ptr)
99 		return -ENOMEM;
100 
101 	pgtable->pgd_dma = pgd_dma;
102 
103 	return 0;
104 }
105 
106 static void ivpu_mmu_pgtables_free(struct ivpu_device *vdev, struct ivpu_mmu_pgtable *pgtable)
107 {
108 	int pgd_idx, pud_idx, pmd_idx;
109 	dma_addr_t pud_dma, pmd_dma, pte_dma;
110 	u64 *pud_dma_ptr, *pmd_dma_ptr, *pte_dma_ptr;
111 
112 	for (pgd_idx = 0; pgd_idx < IVPU_MMU_PGTABLE_ENTRIES; ++pgd_idx) {
113 		pud_dma_ptr = pgtable->pud_ptrs[pgd_idx];
114 		pud_dma = pgtable->pgd_dma_ptr[pgd_idx];
115 
116 		if (!pud_dma_ptr)
117 			continue;
118 
119 		for (pud_idx = 0; pud_idx < IVPU_MMU_PGTABLE_ENTRIES; ++pud_idx) {
120 			pmd_dma_ptr = pgtable->pmd_ptrs[pgd_idx][pud_idx];
121 			pmd_dma = pgtable->pud_ptrs[pgd_idx][pud_idx];
122 
123 			if (!pmd_dma_ptr)
124 				continue;
125 
126 			for (pmd_idx = 0; pmd_idx < IVPU_MMU_PGTABLE_ENTRIES; ++pmd_idx) {
127 				pte_dma_ptr = pgtable->pte_ptrs[pgd_idx][pud_idx][pmd_idx];
128 				pte_dma = pgtable->pmd_ptrs[pgd_idx][pud_idx][pmd_idx];
129 
130 				ivpu_pgtable_free_page(vdev, pte_dma_ptr, pte_dma);
131 			}
132 
133 			kfree(pgtable->pte_ptrs[pgd_idx][pud_idx]);
134 			ivpu_pgtable_free_page(vdev, pmd_dma_ptr, pmd_dma);
135 		}
136 
137 		kfree(pgtable->pmd_ptrs[pgd_idx]);
138 		kfree(pgtable->pte_ptrs[pgd_idx]);
139 		ivpu_pgtable_free_page(vdev, pud_dma_ptr, pud_dma);
140 	}
141 
142 	ivpu_pgtable_free_page(vdev, pgtable->pgd_dma_ptr, pgtable->pgd_dma);
143 }
144 
145 static u64*
146 ivpu_mmu_ensure_pud(struct ivpu_device *vdev, struct ivpu_mmu_pgtable *pgtable, int pgd_idx)
147 {
148 	u64 *pud_dma_ptr = pgtable->pud_ptrs[pgd_idx];
149 	dma_addr_t pud_dma;
150 
151 	if (pud_dma_ptr)
152 		return pud_dma_ptr;
153 
154 	pud_dma_ptr = ivpu_pgtable_alloc_page(vdev, &pud_dma);
155 	if (!pud_dma_ptr)
156 		return NULL;
157 
158 	drm_WARN_ON(&vdev->drm, pgtable->pmd_ptrs[pgd_idx]);
159 	pgtable->pmd_ptrs[pgd_idx] = kzalloc(IVPU_MMU_PGTABLE_SIZE, GFP_KERNEL);
160 	if (!pgtable->pmd_ptrs[pgd_idx])
161 		goto err_free_pud_dma_ptr;
162 
163 	drm_WARN_ON(&vdev->drm, pgtable->pte_ptrs[pgd_idx]);
164 	pgtable->pte_ptrs[pgd_idx] = kzalloc(IVPU_MMU_PGTABLE_SIZE, GFP_KERNEL);
165 	if (!pgtable->pte_ptrs[pgd_idx])
166 		goto err_free_pmd_ptrs;
167 
168 	pgtable->pud_ptrs[pgd_idx] = pud_dma_ptr;
169 	pgtable->pgd_dma_ptr[pgd_idx] = pud_dma | IVPU_MMU_ENTRY_VALID;
170 
171 	return pud_dma_ptr;
172 
173 err_free_pmd_ptrs:
174 	kfree(pgtable->pmd_ptrs[pgd_idx]);
175 
176 err_free_pud_dma_ptr:
177 	ivpu_pgtable_free_page(vdev, pud_dma_ptr, pud_dma);
178 	return NULL;
179 }
180 
181 static u64*
182 ivpu_mmu_ensure_pmd(struct ivpu_device *vdev, struct ivpu_mmu_pgtable *pgtable, int pgd_idx,
183 		    int pud_idx)
184 {
185 	u64 *pmd_dma_ptr = pgtable->pmd_ptrs[pgd_idx][pud_idx];
186 	dma_addr_t pmd_dma;
187 
188 	if (pmd_dma_ptr)
189 		return pmd_dma_ptr;
190 
191 	pmd_dma_ptr = ivpu_pgtable_alloc_page(vdev, &pmd_dma);
192 	if (!pmd_dma_ptr)
193 		return NULL;
194 
195 	drm_WARN_ON(&vdev->drm, pgtable->pte_ptrs[pgd_idx][pud_idx]);
196 	pgtable->pte_ptrs[pgd_idx][pud_idx] = kzalloc(IVPU_MMU_PGTABLE_SIZE, GFP_KERNEL);
197 	if (!pgtable->pte_ptrs[pgd_idx][pud_idx])
198 		goto err_free_pmd_dma_ptr;
199 
200 	pgtable->pmd_ptrs[pgd_idx][pud_idx] = pmd_dma_ptr;
201 	pgtable->pud_ptrs[pgd_idx][pud_idx] = pmd_dma | IVPU_MMU_ENTRY_VALID;
202 
203 	return pmd_dma_ptr;
204 
205 err_free_pmd_dma_ptr:
206 	ivpu_pgtable_free_page(vdev, pmd_dma_ptr, pmd_dma);
207 	return NULL;
208 }
209 
210 static u64*
211 ivpu_mmu_ensure_pte(struct ivpu_device *vdev, struct ivpu_mmu_pgtable *pgtable,
212 		    int pgd_idx, int pud_idx, int pmd_idx)
213 {
214 	u64 *pte_dma_ptr = pgtable->pte_ptrs[pgd_idx][pud_idx][pmd_idx];
215 	dma_addr_t pte_dma;
216 
217 	if (pte_dma_ptr)
218 		return pte_dma_ptr;
219 
220 	pte_dma_ptr = ivpu_pgtable_alloc_page(vdev, &pte_dma);
221 	if (!pte_dma_ptr)
222 		return NULL;
223 
224 	pgtable->pte_ptrs[pgd_idx][pud_idx][pmd_idx] = pte_dma_ptr;
225 	pgtable->pmd_ptrs[pgd_idx][pud_idx][pmd_idx] = pte_dma | IVPU_MMU_ENTRY_VALID;
226 
227 	return pte_dma_ptr;
228 }
229 
230 static int
231 ivpu_mmu_context_map_page(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
232 			  u64 vpu_addr, dma_addr_t dma_addr, u64 prot)
233 {
234 	u64 *pte;
235 	int pgd_idx = FIELD_GET(IVPU_MMU_PGD_INDEX_MASK, vpu_addr);
236 	int pud_idx = FIELD_GET(IVPU_MMU_PUD_INDEX_MASK, vpu_addr);
237 	int pmd_idx = FIELD_GET(IVPU_MMU_PMD_INDEX_MASK, vpu_addr);
238 	int pte_idx = FIELD_GET(IVPU_MMU_PTE_INDEX_MASK, vpu_addr);
239 
240 	/* Allocate PUD - second level page table if needed */
241 	if (!ivpu_mmu_ensure_pud(vdev, &ctx->pgtable, pgd_idx))
242 		return -ENOMEM;
243 
244 	/* Allocate PMD - third level page table if needed */
245 	if (!ivpu_mmu_ensure_pmd(vdev, &ctx->pgtable, pgd_idx, pud_idx))
246 		return -ENOMEM;
247 
248 	/* Allocate PTE - fourth level page table if needed */
249 	pte = ivpu_mmu_ensure_pte(vdev, &ctx->pgtable, pgd_idx, pud_idx, pmd_idx);
250 	if (!pte)
251 		return -ENOMEM;
252 
253 	/* Update PTE */
254 	pte[pte_idx] = dma_addr | prot;
255 
256 	return 0;
257 }
258 
259 static int
260 ivpu_mmu_context_map_cont_64k(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx, u64 vpu_addr,
261 			      dma_addr_t dma_addr, u64 prot)
262 {
263 	size_t size = IVPU_MMU_CONT_PAGES_SIZE;
264 
265 	drm_WARN_ON(&vdev->drm, !IS_ALIGNED(vpu_addr, size));
266 	drm_WARN_ON(&vdev->drm, !IS_ALIGNED(dma_addr, size));
267 
268 	prot |= IVPU_MMU_ENTRY_FLAG_CONT;
269 
270 	while (size) {
271 		int ret = ivpu_mmu_context_map_page(vdev, ctx, vpu_addr, dma_addr, prot);
272 
273 		if (ret)
274 			return ret;
275 
276 		size -= IVPU_MMU_PAGE_SIZE;
277 		vpu_addr += IVPU_MMU_PAGE_SIZE;
278 		dma_addr += IVPU_MMU_PAGE_SIZE;
279 	}
280 
281 	return 0;
282 }
283 
284 static void ivpu_mmu_context_unmap_page(struct ivpu_mmu_context *ctx, u64 vpu_addr)
285 {
286 	int pgd_idx = FIELD_GET(IVPU_MMU_PGD_INDEX_MASK, vpu_addr);
287 	int pud_idx = FIELD_GET(IVPU_MMU_PUD_INDEX_MASK, vpu_addr);
288 	int pmd_idx = FIELD_GET(IVPU_MMU_PMD_INDEX_MASK, vpu_addr);
289 	int pte_idx = FIELD_GET(IVPU_MMU_PTE_INDEX_MASK, vpu_addr);
290 
291 	/* Update PTE with dummy physical address and clear flags */
292 	ctx->pgtable.pte_ptrs[pgd_idx][pud_idx][pmd_idx][pte_idx] = IVPU_MMU_ENTRY_INVALID;
293 }
294 
295 static int
296 ivpu_mmu_context_map_pages(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
297 			   u64 vpu_addr, dma_addr_t dma_addr, size_t size, u64 prot)
298 {
299 	int map_size;
300 	int ret;
301 
302 	while (size) {
303 		if (!ivpu_disable_mmu_cont_pages && size >= IVPU_MMU_CONT_PAGES_SIZE &&
304 		    IS_ALIGNED(vpu_addr | dma_addr, IVPU_MMU_CONT_PAGES_SIZE)) {
305 			ret = ivpu_mmu_context_map_cont_64k(vdev, ctx, vpu_addr, dma_addr, prot);
306 			map_size = IVPU_MMU_CONT_PAGES_SIZE;
307 		} else {
308 			ret = ivpu_mmu_context_map_page(vdev, ctx, vpu_addr, dma_addr, prot);
309 			map_size = IVPU_MMU_PAGE_SIZE;
310 		}
311 
312 		if (ret)
313 			return ret;
314 
315 		vpu_addr += map_size;
316 		dma_addr += map_size;
317 		size -= map_size;
318 	}
319 
320 	return 0;
321 }
322 
323 static void ivpu_mmu_context_set_page_ro(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
324 					 u64 vpu_addr)
325 {
326 	int pgd_idx = FIELD_GET(IVPU_MMU_PGD_INDEX_MASK, vpu_addr);
327 	int pud_idx = FIELD_GET(IVPU_MMU_PUD_INDEX_MASK, vpu_addr);
328 	int pmd_idx = FIELD_GET(IVPU_MMU_PMD_INDEX_MASK, vpu_addr);
329 	int pte_idx = FIELD_GET(IVPU_MMU_PTE_INDEX_MASK, vpu_addr);
330 
331 	ctx->pgtable.pte_ptrs[pgd_idx][pud_idx][pmd_idx][pte_idx] |= IVPU_MMU_ENTRY_FLAG_RO;
332 }
333 
334 static void ivpu_mmu_context_split_page(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
335 					u64 vpu_addr)
336 {
337 	int pgd_idx = FIELD_GET(IVPU_MMU_PGD_INDEX_MASK, vpu_addr);
338 	int pud_idx = FIELD_GET(IVPU_MMU_PUD_INDEX_MASK, vpu_addr);
339 	int pmd_idx = FIELD_GET(IVPU_MMU_PMD_INDEX_MASK, vpu_addr);
340 	int pte_idx = FIELD_GET(IVPU_MMU_PTE_INDEX_MASK, vpu_addr);
341 
342 	ctx->pgtable.pte_ptrs[pgd_idx][pud_idx][pmd_idx][pte_idx] &= ~IVPU_MMU_ENTRY_FLAG_CONT;
343 }
344 
345 static void ivpu_mmu_context_split_64k_page(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
346 					    u64 vpu_addr)
347 {
348 	u64 start = ALIGN_DOWN(vpu_addr, IVPU_MMU_CONT_PAGES_SIZE);
349 	u64 end = ALIGN(vpu_addr, IVPU_MMU_CONT_PAGES_SIZE);
350 	u64 offset = 0;
351 
352 	ivpu_dbg(vdev, MMU_MAP, "Split 64K page ctx: %u vpu_addr: 0x%llx\n", ctx->id, vpu_addr);
353 
354 	while (start + offset < end) {
355 		ivpu_mmu_context_split_page(vdev, ctx, start + offset);
356 		offset += IVPU_MMU_PAGE_SIZE;
357 	}
358 }
359 
360 int
361 ivpu_mmu_context_set_pages_ro(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx, u64 vpu_addr,
362 			      size_t size)
363 {
364 	u64 end = vpu_addr + size;
365 	size_t size_left = size;
366 	int ret;
367 
368 	if (size == 0)
369 		return 0;
370 
371 	if (drm_WARN_ON(&vdev->drm, !IS_ALIGNED(vpu_addr | size, IVPU_MMU_PAGE_SIZE)))
372 		return -EINVAL;
373 
374 	mutex_lock(&ctx->lock);
375 
376 	ivpu_dbg(vdev, MMU_MAP, "Set read-only pages ctx: %u vpu_addr: 0x%llx size: %lu\n",
377 		 ctx->id, vpu_addr, size);
378 
379 	if (!ivpu_disable_mmu_cont_pages) {
380 		/* Split 64K contiguous page at the beginning if needed */
381 		if (!IS_ALIGNED(vpu_addr, IVPU_MMU_CONT_PAGES_SIZE))
382 			ivpu_mmu_context_split_64k_page(vdev, ctx, vpu_addr);
383 
384 		/* Split 64K contiguous page at the end if needed */
385 		if (!IS_ALIGNED(vpu_addr + size, IVPU_MMU_CONT_PAGES_SIZE))
386 			ivpu_mmu_context_split_64k_page(vdev, ctx, vpu_addr + size);
387 	}
388 
389 	while (size_left) {
390 		if (vpu_addr < end)
391 			ivpu_mmu_context_set_page_ro(vdev, ctx, vpu_addr);
392 
393 		vpu_addr += IVPU_MMU_PAGE_SIZE;
394 		size_left -= IVPU_MMU_PAGE_SIZE;
395 	}
396 
397 	/* Ensure page table modifications are flushed from wc buffers to memory */
398 	wmb();
399 
400 	mutex_unlock(&ctx->lock);
401 	ret = ivpu_mmu_invalidate_tlb(vdev, ctx->id);
402 	if (ret)
403 		ivpu_err(vdev, "Failed to invalidate TLB for ctx %u: %d\n", ctx->id, ret);
404 
405 	return 0;
406 }
407 
408 static void ivpu_mmu_context_unmap_pages(struct ivpu_mmu_context *ctx, u64 vpu_addr, size_t size)
409 {
410 	while (size) {
411 		ivpu_mmu_context_unmap_page(ctx, vpu_addr);
412 		vpu_addr += IVPU_MMU_PAGE_SIZE;
413 		size -= IVPU_MMU_PAGE_SIZE;
414 	}
415 }
416 
417 int
418 ivpu_mmu_context_map_sgt(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
419 			 u64 vpu_addr, struct sg_table *sgt,  bool llc_coherent)
420 {
421 	struct scatterlist *sg;
422 	int ret;
423 	u64 prot;
424 	u64 i;
425 
426 	if (drm_WARN_ON(&vdev->drm, !ctx))
427 		return -EINVAL;
428 
429 	if (!IS_ALIGNED(vpu_addr, IVPU_MMU_PAGE_SIZE))
430 		return -EINVAL;
431 
432 	if (vpu_addr & ~IVPU_MMU_VPU_ADDRESS_MASK)
433 		return -EINVAL;
434 
435 	prot = IVPU_MMU_ENTRY_MAPPED;
436 	if (llc_coherent)
437 		prot |= IVPU_MMU_ENTRY_FLAG_LLC_COHERENT;
438 
439 	mutex_lock(&ctx->lock);
440 
441 	for_each_sgtable_dma_sg(sgt, sg, i) {
442 		dma_addr_t dma_addr = sg_dma_address(sg) - sg->offset;
443 		size_t size = sg_dma_len(sg) + sg->offset;
444 
445 		ivpu_dbg(vdev, MMU_MAP, "Map ctx: %u dma_addr: 0x%llx vpu_addr: 0x%llx size: %lu\n",
446 			 ctx->id, dma_addr, vpu_addr, size);
447 
448 		ret = ivpu_mmu_context_map_pages(vdev, ctx, vpu_addr, dma_addr, size, prot);
449 		if (ret) {
450 			ivpu_err(vdev, "Failed to map context pages\n");
451 			mutex_unlock(&ctx->lock);
452 			return ret;
453 		}
454 		vpu_addr += size;
455 	}
456 
457 	/* Ensure page table modifications are flushed from wc buffers to memory */
458 	wmb();
459 
460 	mutex_unlock(&ctx->lock);
461 
462 	ret = ivpu_mmu_invalidate_tlb(vdev, ctx->id);
463 	if (ret)
464 		ivpu_err(vdev, "Failed to invalidate TLB for ctx %u: %d\n", ctx->id, ret);
465 	return ret;
466 }
467 
468 void
469 ivpu_mmu_context_unmap_sgt(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx,
470 			   u64 vpu_addr, struct sg_table *sgt)
471 {
472 	struct scatterlist *sg;
473 	int ret;
474 	u64 i;
475 
476 	if (drm_WARN_ON(&vdev->drm, !ctx))
477 		return;
478 
479 	mutex_lock(&ctx->lock);
480 
481 	for_each_sgtable_dma_sg(sgt, sg, i) {
482 		dma_addr_t dma_addr = sg_dma_address(sg) - sg->offset;
483 		size_t size = sg_dma_len(sg) + sg->offset;
484 
485 		ivpu_dbg(vdev, MMU_MAP, "Unmap ctx: %u dma_addr: 0x%llx vpu_addr: 0x%llx size: %lu\n",
486 			 ctx->id, dma_addr, vpu_addr, size);
487 
488 		ivpu_mmu_context_unmap_pages(ctx, vpu_addr, size);
489 		vpu_addr += size;
490 	}
491 
492 	/* Ensure page table modifications are flushed from wc buffers to memory */
493 	wmb();
494 
495 	mutex_unlock(&ctx->lock);
496 
497 	ret = ivpu_mmu_invalidate_tlb(vdev, ctx->id);
498 	if (ret)
499 		ivpu_warn(vdev, "Failed to invalidate TLB for ctx %u: %d\n", ctx->id, ret);
500 }
501 
502 int
503 ivpu_mmu_context_insert_node(struct ivpu_mmu_context *ctx, const struct ivpu_addr_range *range,
504 			     u64 size, struct drm_mm_node *node)
505 {
506 	int ret;
507 
508 	WARN_ON(!range);
509 
510 	mutex_lock(&ctx->lock);
511 	if (!ivpu_disable_mmu_cont_pages && size >= IVPU_MMU_CONT_PAGES_SIZE) {
512 		ret = drm_mm_insert_node_in_range(&ctx->mm, node, size, IVPU_MMU_CONT_PAGES_SIZE, 0,
513 						  range->start, range->end, DRM_MM_INSERT_BEST);
514 		if (!ret)
515 			goto unlock;
516 	}
517 
518 	ret = drm_mm_insert_node_in_range(&ctx->mm, node, size, IVPU_MMU_PAGE_SIZE, 0,
519 					  range->start, range->end, DRM_MM_INSERT_BEST);
520 unlock:
521 	mutex_unlock(&ctx->lock);
522 	return ret;
523 }
524 
525 void
526 ivpu_mmu_context_remove_node(struct ivpu_mmu_context *ctx, struct drm_mm_node *node)
527 {
528 	mutex_lock(&ctx->lock);
529 	drm_mm_remove_node(node);
530 	mutex_unlock(&ctx->lock);
531 }
532 
533 static int
534 ivpu_mmu_context_init(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx, u32 context_id)
535 {
536 	u64 start, end;
537 	int ret;
538 
539 	mutex_init(&ctx->lock);
540 
541 	ret = ivpu_mmu_pgtable_init(vdev, &ctx->pgtable);
542 	if (ret) {
543 		ivpu_err(vdev, "Failed to initialize pgtable for ctx %u: %d\n", context_id, ret);
544 		return ret;
545 	}
546 
547 	if (!context_id) {
548 		start = vdev->hw->ranges.global.start;
549 		end = vdev->hw->ranges.shave.end;
550 	} else {
551 		start = vdev->hw->ranges.user.start;
552 		end = vdev->hw->ranges.dma.end;
553 	}
554 
555 	drm_mm_init(&ctx->mm, start, end - start);
556 	ctx->id = context_id;
557 
558 	return 0;
559 }
560 
561 static void ivpu_mmu_context_fini(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx)
562 {
563 	if (drm_WARN_ON(&vdev->drm, !ctx->pgtable.pgd_dma_ptr))
564 		return;
565 
566 	mutex_destroy(&ctx->lock);
567 	ivpu_mmu_pgtables_free(vdev, &ctx->pgtable);
568 	drm_mm_takedown(&ctx->mm);
569 
570 	ctx->pgtable.pgd_dma_ptr = NULL;
571 	ctx->pgtable.pgd_dma = 0;
572 }
573 
574 int ivpu_mmu_global_context_init(struct ivpu_device *vdev)
575 {
576 	return ivpu_mmu_context_init(vdev, &vdev->gctx, IVPU_GLOBAL_CONTEXT_MMU_SSID);
577 }
578 
579 void ivpu_mmu_global_context_fini(struct ivpu_device *vdev)
580 {
581 	return ivpu_mmu_context_fini(vdev, &vdev->gctx);
582 }
583 
584 int ivpu_mmu_reserved_context_init(struct ivpu_device *vdev)
585 {
586 	return ivpu_mmu_user_context_init(vdev, &vdev->rctx, IVPU_RESERVED_CONTEXT_MMU_SSID);
587 }
588 
589 void ivpu_mmu_reserved_context_fini(struct ivpu_device *vdev)
590 {
591 	return ivpu_mmu_user_context_fini(vdev, &vdev->rctx);
592 }
593 
594 void ivpu_mmu_user_context_mark_invalid(struct ivpu_device *vdev, u32 ssid)
595 {
596 	struct ivpu_file_priv *file_priv;
597 
598 	xa_lock(&vdev->context_xa);
599 
600 	file_priv = xa_load(&vdev->context_xa, ssid);
601 	if (file_priv)
602 		file_priv->has_mmu_faults = true;
603 
604 	xa_unlock(&vdev->context_xa);
605 }
606 
607 int ivpu_mmu_user_context_init(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx, u32 ctx_id)
608 {
609 	int ret;
610 
611 	drm_WARN_ON(&vdev->drm, !ctx_id);
612 
613 	ret = ivpu_mmu_context_init(vdev, ctx, ctx_id);
614 	if (ret) {
615 		ivpu_err(vdev, "Failed to initialize context %u: %d\n", ctx_id, ret);
616 		return ret;
617 	}
618 
619 	ret = ivpu_mmu_set_pgtable(vdev, ctx_id, &ctx->pgtable);
620 	if (ret) {
621 		ivpu_err(vdev, "Failed to set page table for context %u: %d\n", ctx_id, ret);
622 		goto err_context_fini;
623 	}
624 
625 	return 0;
626 
627 err_context_fini:
628 	ivpu_mmu_context_fini(vdev, ctx);
629 	return ret;
630 }
631 
632 void ivpu_mmu_user_context_fini(struct ivpu_device *vdev, struct ivpu_mmu_context *ctx)
633 {
634 	drm_WARN_ON(&vdev->drm, !ctx->id);
635 
636 	ivpu_mmu_clear_pgtable(vdev, ctx->id);
637 	ivpu_mmu_context_fini(vdev, ctx);
638 }
639