1 // SPDX-License-Identifier: MIT
3 * Copyright © 2020 Intel Corporation
6 #include <linux/log2.h>
8 #include "gen8_ppgtt.h"
9 #include "i915_scatterlist.h"
10 #include "i915_trace.h"
11 #include "i915_pvinfo.h"
12 #include "i915_vgpu.h"
14 #include "intel_gtt.h"
16 static u64 gen8_pde_encode(const dma_addr_t addr,
17 const enum i915_cache_level level)
19 u64 pde = addr | _PAGE_PRESENT | _PAGE_RW;
21 if (level != I915_CACHE_NONE)
22 pde |= PPAT_CACHED_PDE;
29 static u64 gen8_pte_encode(dma_addr_t addr,
30 enum i915_cache_level level,
33 gen8_pte_t pte = addr | _PAGE_PRESENT | _PAGE_RW;
35 if (unlikely(flags & PTE_READ_ONLY))
43 pte |= PPAT_DISPLAY_ELLC;
53 static void gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create)
55 struct drm_i915_private *i915 = ppgtt->vm.i915;
56 struct intel_uncore *uncore = ppgtt->vm.gt->uncore;
57 enum vgt_g2v_type msg;
61 atomic_inc(px_used(ppgtt->pd)); /* never remove */
63 atomic_dec(px_used(ppgtt->pd));
65 mutex_lock(&i915->vgpu.lock);
67 if (i915_vm_is_4lvl(&ppgtt->vm)) {
68 const u64 daddr = px_dma(ppgtt->pd);
70 intel_uncore_write(uncore,
71 vgtif_reg(pdp[0].lo), lower_32_bits(daddr));
72 intel_uncore_write(uncore,
73 vgtif_reg(pdp[0].hi), upper_32_bits(daddr));
76 VGT_G2V_PPGTT_L4_PAGE_TABLE_CREATE :
77 VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY;
79 for (i = 0; i < GEN8_3LVL_PDPES; i++) {
80 const u64 daddr = i915_page_dir_dma_addr(ppgtt, i);
82 intel_uncore_write(uncore,
84 lower_32_bits(daddr));
85 intel_uncore_write(uncore,
87 upper_32_bits(daddr));
91 VGT_G2V_PPGTT_L3_PAGE_TABLE_CREATE :
92 VGT_G2V_PPGTT_L3_PAGE_TABLE_DESTROY;
95 /* g2v_notify atomically (via hv trap) consumes the message packet. */
96 intel_uncore_write(uncore, vgtif_reg(g2v_notify), msg);
98 mutex_unlock(&i915->vgpu.lock);
101 /* Index shifts into the pagetable are offset by GEN8_PTE_SHIFT [12] */
102 #define GEN8_PAGE_SIZE (SZ_4K) /* page and page-directory sizes are the same */
103 #define GEN8_PTE_SHIFT (ilog2(GEN8_PAGE_SIZE))
104 #define GEN8_PDES (GEN8_PAGE_SIZE / sizeof(u64))
105 #define gen8_pd_shift(lvl) ((lvl) * ilog2(GEN8_PDES))
106 #define gen8_pd_index(i, lvl) i915_pde_index((i), gen8_pd_shift(lvl))
107 #define __gen8_pte_shift(lvl) (GEN8_PTE_SHIFT + gen8_pd_shift(lvl))
108 #define __gen8_pte_index(a, lvl) i915_pde_index((a), __gen8_pte_shift(lvl))
110 #define as_pd(x) container_of((x), typeof(struct i915_page_directory), pt)
112 static inline unsigned int
113 gen8_pd_range(u64 start, u64 end, int lvl, unsigned int *idx)
115 const int shift = gen8_pd_shift(lvl);
116 const u64 mask = ~0ull << gen8_pd_shift(lvl + 1);
118 GEM_BUG_ON(start >= end);
119 end += ~mask >> gen8_pd_shift(1);
121 *idx = i915_pde_index(start, shift);
122 if ((start ^ end) & mask)
123 return GEN8_PDES - *idx;
125 return i915_pde_index(end, shift) - *idx;
128 static inline bool gen8_pd_contains(u64 start, u64 end, int lvl)
130 const u64 mask = ~0ull << gen8_pd_shift(lvl + 1);
132 GEM_BUG_ON(start >= end);
133 return (start ^ end) & mask && (start & ~mask) == 0;
136 static inline unsigned int gen8_pt_count(u64 start, u64 end)
138 GEM_BUG_ON(start >= end);
139 if ((start ^ end) >> gen8_pd_shift(1))
140 return GEN8_PDES - (start & (GEN8_PDES - 1));
145 static inline unsigned int
146 gen8_pd_top_count(const struct i915_address_space *vm)
148 unsigned int shift = __gen8_pte_shift(vm->top);
149 return (vm->total + (1ull << shift) - 1) >> shift;
152 static inline struct i915_page_directory *
153 gen8_pdp_for_page_index(struct i915_address_space * const vm, const u64 idx)
155 struct i915_ppgtt * const ppgtt = i915_vm_to_ppgtt(vm);
160 return i915_pd_entry(ppgtt->pd, gen8_pd_index(idx, vm->top));
163 static inline struct i915_page_directory *
164 gen8_pdp_for_page_address(struct i915_address_space * const vm, const u64 addr)
166 return gen8_pdp_for_page_index(vm, addr >> GEN8_PTE_SHIFT);
169 static void __gen8_ppgtt_cleanup(struct i915_address_space *vm,
170 struct i915_page_directory *pd,
174 void **pde = pd->entry;
180 __gen8_ppgtt_cleanup(vm, *pde, GEN8_PDES, lvl - 1);
181 } while (pde++, --count);
187 static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
189 struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
191 if (intel_vgpu_active(vm->i915))
192 gen8_ppgtt_notify_vgt(ppgtt, false);
194 __gen8_ppgtt_cleanup(vm, ppgtt->pd, gen8_pd_top_count(vm), vm->top);
198 static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
199 struct i915_page_directory * const pd,
200 u64 start, const u64 end, int lvl)
202 const struct i915_page_scratch * const scratch = &vm->scratch[lvl];
203 unsigned int idx, len;
205 GEM_BUG_ON(end > vm->total >> GEN8_PTE_SHIFT);
207 len = gen8_pd_range(start, end, lvl--, &idx);
208 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d }\n",
209 __func__, vm, lvl + 1, start, end,
210 idx, len, atomic_read(px_used(pd)));
211 GEM_BUG_ON(!len || len >= atomic_read(px_used(pd)));
214 struct i915_page_table *pt = pd->entry[idx];
216 if (atomic_fetch_inc(&pt->used) >> gen8_pd_shift(1) &&
217 gen8_pd_contains(start, end, lvl)) {
218 DBG("%s(%p):{ lvl:%d, idx:%d, start:%llx, end:%llx } removing pd\n",
219 __func__, vm, lvl + 1, idx, start, end);
220 clear_pd_entry(pd, idx, scratch);
221 __gen8_ppgtt_cleanup(vm, as_pd(pt), I915_PDES, lvl);
222 start += (u64)I915_PDES << gen8_pd_shift(lvl);
227 start = __gen8_ppgtt_clear(vm, as_pd(pt),
233 count = gen8_pt_count(start, end);
234 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d } removing pte\n",
235 __func__, vm, lvl, start, end,
236 gen8_pd_index(start, 0), count,
237 atomic_read(&pt->used));
238 GEM_BUG_ON(!count || count >= atomic_read(&pt->used));
240 vaddr = kmap_atomic_px(pt);
241 memset64(vaddr + gen8_pd_index(start, 0),
242 vm->scratch[0].encode,
244 kunmap_atomic(vaddr);
246 atomic_sub(count, &pt->used);
250 if (release_pd_entry(pd, idx, pt, scratch))
252 } while (idx++, --len);
257 static void gen8_ppgtt_clear(struct i915_address_space *vm,
258 u64 start, u64 length)
260 GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT)));
261 GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT)));
262 GEM_BUG_ON(range_overflows(start, length, vm->total));
264 start >>= GEN8_PTE_SHIFT;
265 length >>= GEN8_PTE_SHIFT;
266 GEM_BUG_ON(length == 0);
268 __gen8_ppgtt_clear(vm, i915_vm_to_ppgtt(vm)->pd,
269 start, start + length, vm->top);
272 static void __gen8_ppgtt_alloc(struct i915_address_space * const vm,
273 struct i915_vm_pt_stash *stash,
274 struct i915_page_directory * const pd,
275 u64 * const start, const u64 end, int lvl)
277 unsigned int idx, len;
279 GEM_BUG_ON(end > vm->total >> GEN8_PTE_SHIFT);
281 len = gen8_pd_range(*start, end, lvl--, &idx);
282 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d }\n",
283 __func__, vm, lvl + 1, *start, end,
284 idx, len, atomic_read(px_used(pd)));
285 GEM_BUG_ON(!len || (idx + len - 1) >> gen8_pd_shift(1));
287 spin_lock(&pd->lock);
288 GEM_BUG_ON(!atomic_read(px_used(pd))); /* Must be pinned! */
290 struct i915_page_table *pt = pd->entry[idx];
293 spin_unlock(&pd->lock);
295 DBG("%s(%p):{ lvl:%d, idx:%d } allocating new tree\n",
296 __func__, vm, lvl + 1, idx);
298 pt = stash->pt[!!lvl];
302 gen8_pt_count(*start, end) < I915_PDES ||
303 intel_vgpu_active(vm->i915))
304 fill_px(pt, vm->scratch[lvl].encode);
306 spin_lock(&pd->lock);
307 if (likely(!pd->entry[idx])) {
308 stash->pt[!!lvl] = pt->stash;
309 atomic_set(&pt->used, 0);
310 set_pd_entry(pd, idx, pt);
317 atomic_inc(&pt->used);
318 spin_unlock(&pd->lock);
320 __gen8_ppgtt_alloc(vm, stash,
321 as_pd(pt), start, end, lvl);
323 spin_lock(&pd->lock);
324 atomic_dec(&pt->used);
325 GEM_BUG_ON(!atomic_read(&pt->used));
327 unsigned int count = gen8_pt_count(*start, end);
329 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d } inserting pte\n",
330 __func__, vm, lvl, *start, end,
331 gen8_pd_index(*start, 0), count,
332 atomic_read(&pt->used));
334 atomic_add(count, &pt->used);
335 /* All other pdes may be simultaneously removed */
336 GEM_BUG_ON(atomic_read(&pt->used) > NALLOC * I915_PDES);
339 } while (idx++, --len);
340 spin_unlock(&pd->lock);
343 static void gen8_ppgtt_alloc(struct i915_address_space *vm,
344 struct i915_vm_pt_stash *stash,
345 u64 start, u64 length)
347 GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT)));
348 GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT)));
349 GEM_BUG_ON(range_overflows(start, length, vm->total));
351 start >>= GEN8_PTE_SHIFT;
352 length >>= GEN8_PTE_SHIFT;
353 GEM_BUG_ON(length == 0);
355 __gen8_ppgtt_alloc(vm, stash, i915_vm_to_ppgtt(vm)->pd,
356 &start, start + length, vm->top);
359 static __always_inline void
360 write_pte(gen8_pte_t *pte, const gen8_pte_t val)
362 /* Magic delays? Or can we refine these to flush all in one pass? */
364 wmb(); /* cpu to cache */
365 clflush(pte); /* cache to memory */
366 wmb(); /* visible to all */
369 static __always_inline u64
370 gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt,
371 struct i915_page_directory *pdp,
372 struct sgt_dma *iter,
374 enum i915_cache_level cache_level,
377 struct i915_page_directory *pd;
378 const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags);
381 pd = i915_pd_entry(pdp, gen8_pd_index(idx, 2));
382 vaddr = kmap_atomic_px(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
384 GEM_BUG_ON(iter->sg->length < I915_GTT_PAGE_SIZE);
385 write_pte(&vaddr[gen8_pd_index(idx, 0)],
386 pte_encode | iter->dma);
388 iter->dma += I915_GTT_PAGE_SIZE;
389 if (iter->dma >= iter->max) {
390 iter->sg = __sg_next(iter->sg);
396 iter->dma = sg_dma_address(iter->sg);
397 iter->max = iter->dma + iter->sg->length;
400 if (gen8_pd_index(++idx, 0) == 0) {
401 if (gen8_pd_index(idx, 1) == 0) {
402 /* Limited by sg length for 3lvl */
403 if (gen8_pd_index(idx, 2) == 0)
406 pd = pdp->entry[gen8_pd_index(idx, 2)];
409 kunmap_atomic(vaddr);
410 vaddr = kmap_atomic_px(i915_pt_entry(pd, gen8_pd_index(idx, 1)));
413 kunmap_atomic(vaddr);
418 static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
419 struct sgt_dma *iter,
420 enum i915_cache_level cache_level,
423 const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags);
424 u64 start = vma->node.start;
425 dma_addr_t rem = iter->sg->length;
427 GEM_BUG_ON(!i915_vm_is_4lvl(vma->vm));
430 struct i915_page_directory * const pdp =
431 gen8_pdp_for_page_address(vma->vm, start);
432 struct i915_page_directory * const pd =
433 i915_pd_entry(pdp, __gen8_pte_index(start, 2));
434 gen8_pte_t encode = pte_encode;
435 unsigned int maybe_64K = -1;
436 unsigned int page_size;
440 if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M &&
441 IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) &&
442 rem >= I915_GTT_PAGE_SIZE_2M &&
443 !__gen8_pte_index(start, 0)) {
444 index = __gen8_pte_index(start, 1);
445 encode |= GEN8_PDE_PS_2M;
446 page_size = I915_GTT_PAGE_SIZE_2M;
448 vaddr = kmap_atomic_px(pd);
450 struct i915_page_table *pt =
451 i915_pt_entry(pd, __gen8_pte_index(start, 1));
453 index = __gen8_pte_index(start, 0);
454 page_size = I915_GTT_PAGE_SIZE;
457 vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K &&
458 IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) &&
459 (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) ||
460 rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE))
461 maybe_64K = __gen8_pte_index(start, 1);
463 vaddr = kmap_atomic_px(pt);
467 GEM_BUG_ON(iter->sg->length < page_size);
468 write_pte(&vaddr[index++], encode | iter->dma);
471 iter->dma += page_size;
473 if (iter->dma >= iter->max) {
474 iter->sg = __sg_next(iter->sg);
478 rem = iter->sg->length;
479 iter->dma = sg_dma_address(iter->sg);
480 iter->max = iter->dma + rem;
482 if (maybe_64K != -1 && index < I915_PDES &&
483 !(IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) &&
484 (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) ||
485 rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE)))
488 if (unlikely(!IS_ALIGNED(iter->dma, page_size)))
491 } while (rem >= page_size && index < I915_PDES);
493 kunmap_atomic(vaddr);
496 * Is it safe to mark the 2M block as 64K? -- Either we have
497 * filled whole page-table with 64K entries, or filled part of
498 * it and have reached the end of the sg table and we have
501 if (maybe_64K != -1 &&
502 (index == I915_PDES ||
503 (i915_vm_has_scratch_64K(vma->vm) &&
504 !iter->sg && IS_ALIGNED(vma->node.start +
506 I915_GTT_PAGE_SIZE_2M)))) {
507 vaddr = kmap_atomic_px(pd);
508 vaddr[maybe_64K] |= GEN8_PDE_IPS_64K;
509 kunmap_atomic(vaddr);
510 page_size = I915_GTT_PAGE_SIZE_64K;
513 * We write all 4K page entries, even when using 64K
514 * pages. In order to verify that the HW isn't cheating
515 * by using the 4K PTE instead of the 64K PTE, we want
516 * to remove all the surplus entries. If the HW skipped
517 * the 64K PTE, it will read/write into the scratch page
518 * instead - which we detect as missing results during
521 if (I915_SELFTEST_ONLY(vma->vm->scrub_64K)) {
524 encode = vma->vm->scratch[0].encode;
525 vaddr = kmap_atomic_px(i915_pt_entry(pd, maybe_64K));
527 for (i = 1; i < index; i += 16)
528 memset64(vaddr + i, encode, 15);
530 kunmap_atomic(vaddr);
534 vma->page_sizes.gtt |= page_size;
538 static void gen8_ppgtt_insert(struct i915_address_space *vm,
539 struct i915_vma *vma,
540 enum i915_cache_level cache_level,
543 struct i915_ppgtt * const ppgtt = i915_vm_to_ppgtt(vm);
544 struct sgt_dma iter = sgt_dma(vma);
546 if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
547 gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags);
549 u64 idx = vma->node.start >> GEN8_PTE_SHIFT;
552 struct i915_page_directory * const pdp =
553 gen8_pdp_for_page_index(vm, idx);
555 idx = gen8_ppgtt_insert_pte(ppgtt, pdp, &iter, idx,
559 vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
563 static int gen8_init_scratch(struct i915_address_space *vm)
569 * If everybody agrees to not to write into the scratch page,
570 * we can reuse it for all vm, keeping contexts and processes separate.
572 if (vm->has_read_only && vm->gt->vm && !i915_is_ggtt(vm->gt->vm)) {
573 struct i915_address_space *clone = vm->gt->vm;
575 GEM_BUG_ON(!clone->has_read_only);
577 vm->scratch_order = clone->scratch_order;
578 memcpy(vm->scratch, clone->scratch, sizeof(vm->scratch));
579 px_dma(&vm->scratch[0]) = 0; /* no xfer of ownership */
583 ret = setup_scratch_page(vm, __GFP_HIGHMEM);
587 vm->scratch[0].encode =
588 gen8_pte_encode(px_dma(&vm->scratch[0]),
589 I915_CACHE_LLC, vm->has_read_only);
591 for (i = 1; i <= vm->top; i++) {
592 if (unlikely(setup_page_dma(vm, px_base(&vm->scratch[i]))))
595 fill_px(&vm->scratch[i], vm->scratch[i - 1].encode);
596 vm->scratch[i].encode =
597 gen8_pde_encode(px_dma(&vm->scratch[i]),
608 static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
610 struct i915_address_space *vm = &ppgtt->vm;
611 struct i915_page_directory *pd = ppgtt->pd;
614 GEM_BUG_ON(vm->top != 2);
615 GEM_BUG_ON(gen8_pd_top_count(vm) != GEN8_3LVL_PDPES);
617 for (idx = 0; idx < GEN8_3LVL_PDPES; idx++) {
618 struct i915_page_directory *pde;
624 fill_px(pde, vm->scratch[1].encode);
625 set_pd_entry(pd, idx, pde);
626 atomic_inc(px_used(pde)); /* keep pinned */
633 static struct i915_page_directory *
634 gen8_alloc_top_pd(struct i915_address_space *vm)
636 const unsigned int count = gen8_pd_top_count(vm);
637 struct i915_page_directory *pd;
639 GEM_BUG_ON(count > ARRAY_SIZE(pd->entry));
641 pd = __alloc_pd(offsetof(typeof(*pd), entry[count]));
643 return ERR_PTR(-ENOMEM);
645 if (unlikely(setup_page_dma(vm, px_base(pd)))) {
647 return ERR_PTR(-ENOMEM);
650 fill_page_dma(px_base(pd), vm->scratch[vm->top].encode, count);
651 atomic_inc(px_used(pd)); /* mark as pinned */
656 * GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers
657 * with a net effect resembling a 2-level page table in normal x86 terms. Each
658 * PDP represents 1GB of memory 4 * 512 * 512 * 4096 = 4GB legacy 32b address
662 struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
664 struct i915_ppgtt *ppgtt;
667 ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
669 return ERR_PTR(-ENOMEM);
671 ppgtt_init(ppgtt, gt);
672 ppgtt->vm.top = i915_vm_is_4lvl(&ppgtt->vm) ? 3 : 2;
673 ppgtt->vm.pd_shift = ilog2(SZ_4K * SZ_4K / sizeof(gen8_pte_t));
676 * From bdw, there is hw support for read-only pages in the PPGTT.
678 * Gen11 has HSDES#:1807136187 unresolved. Disable ro support
681 * Gen12 has inherited the same read-only fault issue from gen11.
683 ppgtt->vm.has_read_only = !IS_GEN_RANGE(gt->i915, 11, 12);
686 * There are only few exceptions for gen >=6. chv and bxt.
687 * And we are not sure about the latter so play safe for now.
689 if (IS_CHERRYVIEW(gt->i915) || IS_BROXTON(gt->i915))
690 ppgtt->vm.pt_kmap_wc = true;
692 err = gen8_init_scratch(&ppgtt->vm);
696 ppgtt->pd = gen8_alloc_top_pd(&ppgtt->vm);
697 if (IS_ERR(ppgtt->pd)) {
698 err = PTR_ERR(ppgtt->pd);
699 goto err_free_scratch;
702 if (!i915_vm_is_4lvl(&ppgtt->vm)) {
703 err = gen8_preallocate_top_level_pdp(ppgtt);
708 ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
709 ppgtt->vm.insert_entries = gen8_ppgtt_insert;
710 ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
711 ppgtt->vm.clear_range = gen8_ppgtt_clear;
713 ppgtt->vm.pte_encode = gen8_pte_encode;
715 if (intel_vgpu_active(gt->i915))
716 gen8_ppgtt_notify_vgt(ppgtt, true);
718 ppgtt->vm.cleanup = gen8_ppgtt_cleanup;
723 __gen8_ppgtt_cleanup(&ppgtt->vm, ppgtt->pd,
724 gen8_pd_top_count(&ppgtt->vm), ppgtt->vm.top);
726 free_scratch(&ppgtt->vm);