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1/*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright © 2008-2012 Intel Corporation
5 */
6
7#include <linux/errno.h>
8#include <linux/mutex.h>
9
10#include <drm/drm_mm.h>
11#include <drm/i915_drm.h>
12
13#include "gem/i915_gem_lmem.h"
14#include "gem/i915_gem_region.h"
15#include "gt/intel_gt.h"
16#include "gt/intel_gt_mcr.h"
17#include "gt/intel_gt_regs.h"
18#include "gt/intel_region_lmem.h"
19#include "i915_drv.h"
20#include "i915_gem_stolen.h"
21#include "i915_pci.h"
22#include "i915_reg.h"
23#include "i915_utils.h"
24#include "i915_vgpu.h"
25#include "intel_mchbar_regs.h"
26#include "intel_pci_config.h"
27
28/*
29 * The BIOS typically reserves some of the system's memory for the exclusive
30 * use of the integrated graphics. This memory is no longer available for
31 * use by the OS and so the user finds that his system has less memory
32 * available than he put in. We refer to this memory as stolen.
33 *
34 * The BIOS will allocate its framebuffer from the stolen memory. Our
35 * goal is try to reuse that object for our own fbcon which must always
36 * be available for panics. Anything else we can reuse the stolen memory
37 * for is a boon.
38 */
39
40int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915,
41 struct drm_mm_node *node, u64 size,
42 unsigned alignment, u64 start, u64 end)
43{
44 int ret;
45
46 if (!drm_mm_initialized(&i915->mm.stolen))
47 return -ENODEV;
48
49 /* WaSkipStolenMemoryFirstPage:bdw+ */
50 if (GRAPHICS_VER(i915) >= 8 && start < 4096)
51 start = 4096;
52
53 mutex_lock(&i915->mm.stolen_lock);
54 ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node,
55 size, alignment, 0,
56 start, end, DRM_MM_INSERT_BEST);
57 mutex_unlock(&i915->mm.stolen_lock);
58
59 return ret;
60}
61
62int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
63 struct drm_mm_node *node, u64 size,
64 unsigned alignment)
65{
66 return i915_gem_stolen_insert_node_in_range(i915, node,
67 size, alignment,
68 I915_GEM_STOLEN_BIAS,
69 U64_MAX);
70}
71
72void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
73 struct drm_mm_node *node)
74{
75 mutex_lock(&i915->mm.stolen_lock);
76 drm_mm_remove_node(node);
77 mutex_unlock(&i915->mm.stolen_lock);
78}
79
80static bool valid_stolen_size(struct drm_i915_private *i915, struct resource *dsm)
81{
82 return (dsm->start != 0 || HAS_LMEMBAR_SMEM_STOLEN(i915)) && dsm->end > dsm->start;
83}
84
85static int adjust_stolen(struct drm_i915_private *i915,
86 struct resource *dsm)
87{
88 struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
89 struct intel_uncore *uncore = ggtt->vm.gt->uncore;
90
91 if (!valid_stolen_size(i915, dsm))
92 return -EINVAL;
93
94 /*
95 * Make sure we don't clobber the GTT if it's within stolen memory
96 *
97 * TODO: We have yet too encounter the case where the GTT wasn't at the
98 * end of stolen. With that assumption we could simplify this.
99 */
100 if (GRAPHICS_VER(i915) <= 4 &&
101 !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) {
102 struct resource stolen[2] = {*dsm, *dsm};
103 struct resource ggtt_res;
104 resource_size_t ggtt_start;
105
106 ggtt_start = intel_uncore_read(uncore, PGTBL_CTL);
107 if (GRAPHICS_VER(i915) == 4)
108 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
109 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
110 else
111 ggtt_start &= PGTBL_ADDRESS_LO_MASK;
112
113 ggtt_res = DEFINE_RES_MEM(ggtt_start, ggtt_total_entries(ggtt) * 4);
114
115 if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
116 stolen[0].end = ggtt_res.start;
117 if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
118 stolen[1].start = ggtt_res.end;
119
120 /* Pick the larger of the two chunks */
121 if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
122 *dsm = stolen[0];
123 else
124 *dsm = stolen[1];
125
126 if (stolen[0].start != stolen[1].start ||
127 stolen[0].end != stolen[1].end) {
128 drm_dbg(&i915->drm,
129 "GTT within stolen memory at %pR\n",
130 &ggtt_res);
131 drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n",
132 dsm);
133 }
134 }
135
136 if (!valid_stolen_size(i915, dsm))
137 return -EINVAL;
138
139 return 0;
140}
141
142static int request_smem_stolen(struct drm_i915_private *i915,
143 struct resource *dsm)
144{
145 struct resource *r;
146
147 /*
148 * With stolen lmem, we don't need to request system memory for the
149 * address range since it's local to the gpu.
150 *
151 * Starting MTL, in IGFX devices the stolen memory is exposed via
152 * LMEMBAR and shall be considered similar to stolen lmem.
153 */
154 if (HAS_LMEM(i915) || HAS_LMEMBAR_SMEM_STOLEN(i915))
155 return 0;
156
157 /*
158 * Verify that nothing else uses this physical address. Stolen
159 * memory should be reserved by the BIOS and hidden from the
160 * kernel. So if the region is already marked as busy, something
161 * is seriously wrong.
162 */
163 r = devm_request_mem_region(i915->drm.dev, dsm->start,
164 resource_size(dsm),
165 "Graphics Stolen Memory");
166 if (r == NULL) {
167 /*
168 * One more attempt but this time requesting region from
169 * start + 1, as we have seen that this resolves the region
170 * conflict with the PCI Bus.
171 * This is a BIOS w/a: Some BIOS wrap stolen in the root
172 * PCI bus, but have an off-by-one error. Hence retry the
173 * reservation starting from 1 instead of 0.
174 * There's also BIOS with off-by-one on the other end.
175 */
176 r = devm_request_mem_region(i915->drm.dev, dsm->start + 1,
177 resource_size(dsm) - 2,
178 "Graphics Stolen Memory");
179 /*
180 * GEN3 firmware likes to smash pci bridges into the stolen
181 * range. Apparently this works.
182 */
183 if (!r && GRAPHICS_VER(i915) != 3) {
184 drm_err(&i915->drm,
185 "conflict detected with stolen region: %pR\n",
186 dsm);
187
188 return -EBUSY;
189 }
190 }
191
192 return 0;
193}
194
195static void i915_gem_cleanup_stolen(struct drm_i915_private *i915)
196{
197 if (!drm_mm_initialized(&i915->mm.stolen))
198 return;
199
200 drm_mm_takedown(&i915->mm.stolen);
201}
202
203static void g4x_get_stolen_reserved(struct drm_i915_private *i915,
204 struct intel_uncore *uncore,
205 resource_size_t *base,
206 resource_size_t *size)
207{
208 u32 reg_val = intel_uncore_read(uncore,
209 IS_GM45(i915) ?
210 CTG_STOLEN_RESERVED :
211 ELK_STOLEN_RESERVED);
212 resource_size_t stolen_top = i915->dsm.stolen.end + 1;
213
214 drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n",
215 IS_GM45(i915) ? "CTG" : "ELK", reg_val);
216
217 if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
218 return;
219
220 /*
221 * Whether ILK really reuses the ELK register for this is unclear.
222 * Let's see if we catch anyone with this supposedly enabled on ILK.
223 */
224 drm_WARN(&i915->drm, GRAPHICS_VER(i915) == 5,
225 "ILK stolen reserved found? 0x%08x\n",
226 reg_val);
227
228 if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
229 return;
230
231 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
232 drm_WARN_ON(&i915->drm,
233 (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
234
235 *size = stolen_top - *base;
236}
237
238static void gen6_get_stolen_reserved(struct drm_i915_private *i915,
239 struct intel_uncore *uncore,
240 resource_size_t *base,
241 resource_size_t *size)
242{
243 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
244
245 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
246
247 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
248 return;
249
250 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
251
252 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
253 case GEN6_STOLEN_RESERVED_1M:
254 *size = 1024 * 1024;
255 break;
256 case GEN6_STOLEN_RESERVED_512K:
257 *size = 512 * 1024;
258 break;
259 case GEN6_STOLEN_RESERVED_256K:
260 *size = 256 * 1024;
261 break;
262 case GEN6_STOLEN_RESERVED_128K:
263 *size = 128 * 1024;
264 break;
265 default:
266 *size = 1024 * 1024;
267 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
268 }
269}
270
271static void vlv_get_stolen_reserved(struct drm_i915_private *i915,
272 struct intel_uncore *uncore,
273 resource_size_t *base,
274 resource_size_t *size)
275{
276 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
277 resource_size_t stolen_top = i915->dsm.stolen.end + 1;
278
279 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
280
281 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
282 return;
283
284 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
285 default:
286 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
287 fallthrough;
288 case GEN7_STOLEN_RESERVED_1M:
289 *size = 1024 * 1024;
290 break;
291 }
292
293 /*
294 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
295 * reserved location as (top - size).
296 */
297 *base = stolen_top - *size;
298}
299
300static void gen7_get_stolen_reserved(struct drm_i915_private *i915,
301 struct intel_uncore *uncore,
302 resource_size_t *base,
303 resource_size_t *size)
304{
305 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
306
307 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
308
309 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
310 return;
311
312 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
313
314 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
315 case GEN7_STOLEN_RESERVED_1M:
316 *size = 1024 * 1024;
317 break;
318 case GEN7_STOLEN_RESERVED_256K:
319 *size = 256 * 1024;
320 break;
321 default:
322 *size = 1024 * 1024;
323 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
324 }
325}
326
327static void chv_get_stolen_reserved(struct drm_i915_private *i915,
328 struct intel_uncore *uncore,
329 resource_size_t *base,
330 resource_size_t *size)
331{
332 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
333
334 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
335
336 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
337 return;
338
339 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
340
341 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
342 case GEN8_STOLEN_RESERVED_1M:
343 *size = 1024 * 1024;
344 break;
345 case GEN8_STOLEN_RESERVED_2M:
346 *size = 2 * 1024 * 1024;
347 break;
348 case GEN8_STOLEN_RESERVED_4M:
349 *size = 4 * 1024 * 1024;
350 break;
351 case GEN8_STOLEN_RESERVED_8M:
352 *size = 8 * 1024 * 1024;
353 break;
354 default:
355 *size = 8 * 1024 * 1024;
356 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
357 }
358}
359
360static void bdw_get_stolen_reserved(struct drm_i915_private *i915,
361 struct intel_uncore *uncore,
362 resource_size_t *base,
363 resource_size_t *size)
364{
365 u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
366 resource_size_t stolen_top = i915->dsm.stolen.end + 1;
367
368 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
369
370 if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
371 return;
372
373 if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
374 return;
375
376 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
377 *size = stolen_top - *base;
378}
379
380static void icl_get_stolen_reserved(struct drm_i915_private *i915,
381 struct intel_uncore *uncore,
382 resource_size_t *base,
383 resource_size_t *size)
384{
385 u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED);
386
387 drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
388
389 /* Wa_14019821291 */
390 if (MEDIA_VER_FULL(i915) == IP_VER(13, 0)) {
391 /*
392 * This workaround is primarily implemented by the BIOS. We
393 * just need to figure out whether the BIOS has applied the
394 * workaround (meaning the programmed address falls within
395 * the DSM) and, if so, reserve that part of the DSM to
396 * prevent accidental reuse. The DSM location should be just
397 * below the WOPCM.
398 */
399 u64 gscpsmi_base = intel_uncore_read64_2x32(uncore,
400 MTL_GSCPSMI_BASEADDR_LSB,
401 MTL_GSCPSMI_BASEADDR_MSB);
402 if (gscpsmi_base >= i915->dsm.stolen.start &&
403 gscpsmi_base < i915->dsm.stolen.end) {
404 *base = gscpsmi_base;
405 *size = i915->dsm.stolen.end - gscpsmi_base;
406 return;
407 }
408 }
409
410 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
411 case GEN8_STOLEN_RESERVED_1M:
412 *size = 1024 * 1024;
413 break;
414 case GEN8_STOLEN_RESERVED_2M:
415 *size = 2 * 1024 * 1024;
416 break;
417 case GEN8_STOLEN_RESERVED_4M:
418 *size = 4 * 1024 * 1024;
419 break;
420 case GEN8_STOLEN_RESERVED_8M:
421 *size = 8 * 1024 * 1024;
422 break;
423 default:
424 *size = 8 * 1024 * 1024;
425 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
426 }
427
428 if (HAS_LMEMBAR_SMEM_STOLEN(i915))
429 /* the base is initialized to stolen top so subtract size to get base */
430 *base -= *size;
431 else
432 *base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
433}
434
435/*
436 * Initialize i915->dsm.reserved to contain the reserved space within the Data
437 * Stolen Memory. This is a range on the top of DSM that is reserved, not to
438 * be used by driver, so must be excluded from the region passed to the
439 * allocator later. In the spec this is also called as WOPCM.
440 *
441 * Our expectation is that the reserved space is at the top of the stolen
442 * region, as it has been the case for every platform, and *never* at the
443 * bottom, so the calculation here can be simplified.
444 */
445static int init_reserved_stolen(struct drm_i915_private *i915)
446{
447 struct intel_uncore *uncore = &i915->uncore;
448 resource_size_t reserved_base, stolen_top;
449 resource_size_t reserved_size;
450 int ret = 0;
451
452 stolen_top = i915->dsm.stolen.end + 1;
453 reserved_base = stolen_top;
454 reserved_size = 0;
455
456 if (GRAPHICS_VER(i915) >= 11) {
457 icl_get_stolen_reserved(i915, uncore,
458 &reserved_base, &reserved_size);
459 } else if (GRAPHICS_VER(i915) >= 8) {
460 if (IS_LP(i915))
461 chv_get_stolen_reserved(i915, uncore,
462 &reserved_base, &reserved_size);
463 else
464 bdw_get_stolen_reserved(i915, uncore,
465 &reserved_base, &reserved_size);
466 } else if (GRAPHICS_VER(i915) >= 7) {
467 if (IS_VALLEYVIEW(i915))
468 vlv_get_stolen_reserved(i915, uncore,
469 &reserved_base, &reserved_size);
470 else
471 gen7_get_stolen_reserved(i915, uncore,
472 &reserved_base, &reserved_size);
473 } else if (GRAPHICS_VER(i915) >= 6) {
474 gen6_get_stolen_reserved(i915, uncore,
475 &reserved_base, &reserved_size);
476 } else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) {
477 g4x_get_stolen_reserved(i915, uncore,
478 &reserved_base, &reserved_size);
479 }
480
481 /* No reserved stolen */
482 if (reserved_base == stolen_top)
483 goto bail_out;
484
485 if (!reserved_base) {
486 drm_err(&i915->drm,
487 "inconsistent reservation %pa + %pa; ignoring\n",
488 &reserved_base, &reserved_size);
489 ret = -EINVAL;
490 goto bail_out;
491 }
492
493 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, reserved_size);
494
495 if (!resource_contains(&i915->dsm.stolen, &i915->dsm.reserved)) {
496 drm_err(&i915->drm,
497 "Stolen reserved area %pR outside stolen memory %pR\n",
498 &i915->dsm.reserved, &i915->dsm.stolen);
499 ret = -EINVAL;
500 goto bail_out;
501 }
502
503 return 0;
504
505bail_out:
506 i915->dsm.reserved = DEFINE_RES_MEM(reserved_base, 0);
507
508 return ret;
509}
510
511static int i915_gem_init_stolen(struct intel_memory_region *mem)
512{
513 struct drm_i915_private *i915 = mem->i915;
514
515 mutex_init(&i915->mm.stolen_lock);
516
517 if (intel_vgpu_active(i915)) {
518 drm_notice(&i915->drm,
519 "%s, disabling use of stolen memory\n",
520 "iGVT-g active");
521 return -ENOSPC;
522 }
523
524 if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) {
525 drm_notice(&i915->drm,
526 "%s, disabling use of stolen memory\n",
527 "DMAR active");
528 return -ENOSPC;
529 }
530
531 if (adjust_stolen(i915, &mem->region))
532 return -ENOSPC;
533
534 if (request_smem_stolen(i915, &mem->region))
535 return -ENOSPC;
536
537 i915->dsm.stolen = mem->region;
538
539 if (init_reserved_stolen(i915))
540 return -ENOSPC;
541
542 /* Exclude the reserved region from driver use */
543 mem->region.end = i915->dsm.reserved.start - 1;
544 mem->io_size = min(mem->io_size, resource_size(&mem->region));
545
546 i915->dsm.usable_size = resource_size(&mem->region);
547
548 drm_dbg(&i915->drm,
549 "Memory reserved for graphics device: %lluK, usable: %lluK\n",
550 (u64)resource_size(&i915->dsm.stolen) >> 10,
551 (u64)i915->dsm.usable_size >> 10);
552
553 if (i915->dsm.usable_size == 0)
554 return -ENOSPC;
555
556 /* Basic memrange allocator for stolen space. */
557 drm_mm_init(&i915->mm.stolen, 0, i915->dsm.usable_size);
558
559 /*
560 * Access to stolen lmem beyond certain size for MTL A0 stepping
561 * would crash the machine. Disable stolen lmem for userspace access
562 * by setting usable_size to zero.
563 */
564 if (IS_METEORLAKE(i915) && INTEL_REVID(i915) == 0x0)
565 i915->dsm.usable_size = 0;
566
567 return 0;
568}
569
570static void dbg_poison(struct i915_ggtt *ggtt,
571 dma_addr_t addr, resource_size_t size,
572 u8 x)
573{
574#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
575 if (!drm_mm_node_allocated(&ggtt->error_capture))
576 return;
577
578 if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND)
579 return; /* beware stop_machine() inversion */
580
581 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));
582
583 mutex_lock(&ggtt->error_mutex);
584 while (size) {
585 void __iomem *s;
586
587 ggtt->vm.insert_page(&ggtt->vm, addr,
588 ggtt->error_capture.start,
589 i915_gem_get_pat_index(ggtt->vm.i915,
590 I915_CACHE_NONE),
591 0);
592 mb();
593
594 s = io_mapping_map_wc(&ggtt->iomap,
595 ggtt->error_capture.start,
596 PAGE_SIZE);
597 memset_io(s, x, PAGE_SIZE);
598 io_mapping_unmap(s);
599
600 addr += PAGE_SIZE;
601 size -= PAGE_SIZE;
602 }
603 mb();
604 ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
605 mutex_unlock(&ggtt->error_mutex);
606#endif
607}
608
609static struct sg_table *
610i915_pages_create_for_stolen(struct drm_device *dev,
611 resource_size_t offset, resource_size_t size)
612{
613 struct drm_i915_private *i915 = to_i915(dev);
614 struct sg_table *st;
615 struct scatterlist *sg;
616
617 GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm.stolen)));
618
619 /* We hide that we have no struct page backing our stolen object
620 * by wrapping the contiguous physical allocation with a fake
621 * dma mapping in a single scatterlist.
622 */
623
624 st = kmalloc(sizeof(*st), GFP_KERNEL);
625 if (st == NULL)
626 return ERR_PTR(-ENOMEM);
627
628 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
629 kfree(st);
630 return ERR_PTR(-ENOMEM);
631 }
632
633 sg = st->sgl;
634 sg->offset = 0;
635 sg->length = size;
636
637 sg_dma_address(sg) = (dma_addr_t)i915->dsm.stolen.start + offset;
638 sg_dma_len(sg) = size;
639
640 return st;
641}
642
643static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
644{
645 struct drm_i915_private *i915 = to_i915(obj->base.dev);
646 struct sg_table *pages =
647 i915_pages_create_for_stolen(obj->base.dev,
648 obj->stolen->start,
649 obj->stolen->size);
650 if (IS_ERR(pages))
651 return PTR_ERR(pages);
652
653 dbg_poison(to_gt(i915)->ggtt,
654 sg_dma_address(pages->sgl),
655 sg_dma_len(pages->sgl),
656 POISON_INUSE);
657
658 __i915_gem_object_set_pages(obj, pages);
659
660 return 0;
661}
662
663static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
664 struct sg_table *pages)
665{
666 struct drm_i915_private *i915 = to_i915(obj->base.dev);
667 /* Should only be called from i915_gem_object_release_stolen() */
668
669 dbg_poison(to_gt(i915)->ggtt,
670 sg_dma_address(pages->sgl),
671 sg_dma_len(pages->sgl),
672 POISON_FREE);
673
674 sg_free_table(pages);
675 kfree(pages);
676}
677
678static void
679i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
680{
681 struct drm_i915_private *i915 = to_i915(obj->base.dev);
682 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
683
684 GEM_BUG_ON(!stolen);
685 i915_gem_stolen_remove_node(i915, stolen);
686 kfree(stolen);
687
688 i915_gem_object_release_memory_region(obj);
689}
690
691static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
692 .name = "i915_gem_object_stolen",
693 .get_pages = i915_gem_object_get_pages_stolen,
694 .put_pages = i915_gem_object_put_pages_stolen,
695 .release = i915_gem_object_release_stolen,
696};
697
698static int __i915_gem_object_create_stolen(struct intel_memory_region *mem,
699 struct drm_i915_gem_object *obj,
700 struct drm_mm_node *stolen)
701{
702 static struct lock_class_key lock_class;
703 unsigned int cache_level;
704 unsigned int flags;
705 int err;
706
707 /*
708 * Stolen objects are always physically contiguous since we just
709 * allocate one big block underneath using the drm_mm range allocator.
710 */
711 flags = I915_BO_ALLOC_CONTIGUOUS;
712
713 drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
714 i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags);
715
716 obj->stolen = stolen;
717 obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
718 cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
719 i915_gem_object_set_cache_coherency(obj, cache_level);
720
721 if (WARN_ON(!i915_gem_object_trylock(obj, NULL)))
722 return -EBUSY;
723
724 i915_gem_object_init_memory_region(obj, mem);
725
726 err = i915_gem_object_pin_pages(obj);
727 if (err)
728 i915_gem_object_release_memory_region(obj);
729 i915_gem_object_unlock(obj);
730
731 return err;
732}
733
734static int _i915_gem_object_stolen_init(struct intel_memory_region *mem,
735 struct drm_i915_gem_object *obj,
736 resource_size_t offset,
737 resource_size_t size,
738 resource_size_t page_size,
739 unsigned int flags)
740{
741 struct drm_i915_private *i915 = mem->i915;
742 struct drm_mm_node *stolen;
743 int ret;
744
745 if (!drm_mm_initialized(&i915->mm.stolen))
746 return -ENODEV;
747
748 if (size == 0)
749 return -EINVAL;
750
751 /*
752 * With discrete devices, where we lack a mappable aperture there is no
753 * possible way to ever access this memory on the CPU side.
754 */
755 if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size &&
756 !(flags & I915_BO_ALLOC_GPU_ONLY))
757 return -ENOSPC;
758
759 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
760 if (!stolen)
761 return -ENOMEM;
762
763 if (offset != I915_BO_INVALID_OFFSET) {
764 drm_dbg(&i915->drm,
765 "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
766 &offset, &size);
767
768 stolen->start = offset;
769 stolen->size = size;
770 mutex_lock(&i915->mm.stolen_lock);
771 ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
772 mutex_unlock(&i915->mm.stolen_lock);
773 } else {
774 ret = i915_gem_stolen_insert_node(i915, stolen, size,
775 mem->min_page_size);
776 }
777 if (ret)
778 goto err_free;
779
780 ret = __i915_gem_object_create_stolen(mem, obj, stolen);
781 if (ret)
782 goto err_remove;
783
784 return 0;
785
786err_remove:
787 i915_gem_stolen_remove_node(i915, stolen);
788err_free:
789 kfree(stolen);
790 return ret;
791}
792
793struct drm_i915_gem_object *
794i915_gem_object_create_stolen(struct drm_i915_private *i915,
795 resource_size_t size)
796{
797 return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0);
798}
799
800static int init_stolen_smem(struct intel_memory_region *mem)
801{
802 int err;
803
804 /*
805 * Initialise stolen early so that we may reserve preallocated
806 * objects for the BIOS to KMS transition.
807 */
808 err = i915_gem_init_stolen(mem);
809 if (err)
810 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n");
811
812 return 0;
813}
814
815static int release_stolen_smem(struct intel_memory_region *mem)
816{
817 i915_gem_cleanup_stolen(mem->i915);
818 return 0;
819}
820
821static const struct intel_memory_region_ops i915_region_stolen_smem_ops = {
822 .init = init_stolen_smem,
823 .release = release_stolen_smem,
824 .init_object = _i915_gem_object_stolen_init,
825};
826
827static int init_stolen_lmem(struct intel_memory_region *mem)
828{
829 struct drm_i915_private *i915 = mem->i915;
830 int err;
831
832 if (GEM_WARN_ON(resource_size(&mem->region) == 0))
833 return 0;
834
835 err = i915_gem_init_stolen(mem);
836 if (err) {
837 drm_dbg(&mem->i915->drm, "Skip stolen region: failed to setup\n");
838 return 0;
839 }
840
841 if (mem->io_size &&
842 !io_mapping_init_wc(&mem->iomap, mem->io_start, mem->io_size))
843 goto err_cleanup;
844
845 drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n",
846 &mem->io_start);
847 drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &mem->region.start);
848
849 return 0;
850
851err_cleanup:
852 i915_gem_cleanup_stolen(mem->i915);
853 return err;
854}
855
856static int release_stolen_lmem(struct intel_memory_region *mem)
857{
858 if (mem->io_size)
859 io_mapping_fini(&mem->iomap);
860 i915_gem_cleanup_stolen(mem->i915);
861 return 0;
862}
863
864static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = {
865 .init = init_stolen_lmem,
866 .release = release_stolen_lmem,
867 .init_object = _i915_gem_object_stolen_init,
868};
869
870static int mtl_get_gms_size(struct intel_uncore *uncore)
871{
872 u16 ggc, gms;
873
874 ggc = intel_uncore_read16(uncore, GGC);
875
876 /* check GGMS, should be fixed 0x3 (8MB) */
877 if ((ggc & GGMS_MASK) != GGMS_MASK)
878 return -EIO;
879
880 /* return valid GMS value, -EIO if invalid */
881 gms = REG_FIELD_GET(GMS_MASK, ggc);
882 switch (gms) {
883 case 0x0 ... 0x04:
884 return gms * 32;
885 case 0xf0 ... 0xfe:
886 return (gms - 0xf0 + 1) * 4;
887 default:
888 MISSING_CASE(gms);
889 return -EIO;
890 }
891}
892
893struct intel_memory_region *
894i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
895 u16 instance)
896{
897 struct intel_uncore *uncore = &i915->uncore;
898 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
899 resource_size_t dsm_size, dsm_base, lmem_size;
900 struct intel_memory_region *mem;
901 resource_size_t io_start, io_size;
902 resource_size_t min_page_size;
903 int ret;
904
905 if (WARN_ON_ONCE(instance))
906 return ERR_PTR(-ENODEV);
907
908 if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR))
909 return ERR_PTR(-ENXIO);
910
911 if (HAS_LMEMBAR_SMEM_STOLEN(i915) || IS_DG1(i915)) {
912 lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR);
913 } else {
914 resource_size_t lmem_range;
915
916 lmem_range = intel_gt_mcr_read_any(to_gt(i915), XEHP_TILE0_ADDR_RANGE) & 0xFFFF;
917 lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT;
918 lmem_size *= SZ_1G;
919 }
920
921 if (HAS_LMEMBAR_SMEM_STOLEN(i915)) {
922 /*
923 * MTL dsm size is in GGC register.
924 * Also MTL uses offset to GSMBASE in ptes, so i915
925 * uses dsm_base = 8MBs to setup stolen region, since
926 * DSMBASE = GSMBASE + 8MB.
927 */
928 ret = mtl_get_gms_size(uncore);
929 if (ret < 0) {
930 drm_err(&i915->drm, "invalid MTL GGC register setting\n");
931 return ERR_PTR(ret);
932 }
933
934 dsm_base = SZ_8M;
935 dsm_size = (resource_size_t)(ret * SZ_1M);
936
937 GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != SZ_256M);
938 GEM_BUG_ON((dsm_base + dsm_size) > lmem_size);
939 } else {
940 /* Use DSM base address instead for stolen memory */
941 dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK;
942 if (WARN_ON(lmem_size < dsm_base))
943 return ERR_PTR(-ENODEV);
944 dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M);
945 }
946
947 if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) {
948 io_start = 0;
949 io_size = 0;
950 } else {
951 io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base;
952 io_size = dsm_size;
953 }
954
955 min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
956 I915_GTT_PAGE_SIZE_4K;
957
958 mem = intel_memory_region_create(i915, dsm_base, dsm_size,
959 min_page_size,
960 io_start, io_size,
961 type, instance,
962 &i915_region_stolen_lmem_ops);
963 if (IS_ERR(mem))
964 return mem;
965
966 intel_memory_region_set_name(mem, "stolen-local");
967
968 mem->private = true;
969
970 return mem;
971}
972
973struct intel_memory_region*
974i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type,
975 u16 instance)
976{
977 struct intel_memory_region *mem;
978
979 mem = intel_memory_region_create(i915,
980 intel_graphics_stolen_res.start,
981 resource_size(&intel_graphics_stolen_res),
982 PAGE_SIZE, 0, 0, type, instance,
983 &i915_region_stolen_smem_ops);
984 if (IS_ERR(mem))
985 return mem;
986
987 intel_memory_region_set_name(mem, "stolen-system");
988
989 mem->private = true;
990
991 return mem;
992}
993
994bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
995{
996 return obj->ops == &i915_gem_object_stolen_ops;
997}
998
999bool i915_gem_stolen_initialized(const struct drm_i915_private *i915)
1000{
1001 return drm_mm_initialized(&i915->mm.stolen);
1002}
1003
1004u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915)
1005{
1006 return i915->dsm.stolen.start;
1007}
1008
1009u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915)
1010{
1011 return resource_size(&i915->dsm.stolen);
1012}
1013
1014u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915,
1015 const struct drm_mm_node *node)
1016{
1017 return i915->dsm.stolen.start + i915_gem_stolen_node_offset(node);
1018}
1019
1020bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node)
1021{
1022 return drm_mm_node_allocated(node);
1023}
1024
1025u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node)
1026{
1027 return node->start;
1028}
1029
1030u64 i915_gem_stolen_node_size(const struct drm_mm_node *node)
1031{
1032 return node->size;
1033}