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agp/intel: Flush all chipset writes after updating the GGTT
[mirror_ubuntu-bionic-kernel.git] / drivers / char / agp / intel-gtt.c
1 /*
2 * Intel GTT (Graphics Translation Table) routines
3 *
4 * Caveat: This driver implements the linux agp interface, but this is far from
5 * a agp driver! GTT support ended up here for purely historical reasons: The
6 * old userspace intel graphics drivers needed an interface to map memory into
7 * the GTT. And the drm provides a default interface for graphic devices sitting
8 * on an agp port. So it made sense to fake the GTT support as an agp port to
9 * avoid having to create a new api.
10 *
11 * With gem this does not make much sense anymore, just needlessly complicates
12 * the code. But as long as the old graphics stack is still support, it's stuck
13 * here.
14 *
15 * /fairy-tale-mode off
16 */
17
18 #include <linux/module.h>
19 #include <linux/pci.h>
20 #include <linux/kernel.h>
21 #include <linux/pagemap.h>
22 #include <linux/agp_backend.h>
23 #include <linux/delay.h>
24 #include <asm/smp.h>
25 #include "agp.h"
26 #include "intel-agp.h"
27 #include <drm/intel-gtt.h>
28 #include <asm/set_memory.h>
29
30 /*
31 * If we have Intel graphics, we're not going to have anything other than
32 * an Intel IOMMU. So make the correct use of the PCI DMA API contingent
33 * on the Intel IOMMU support (CONFIG_INTEL_IOMMU).
34 * Only newer chipsets need to bother with this, of course.
35 */
36 #ifdef CONFIG_INTEL_IOMMU
37 #define USE_PCI_DMA_API 1
38 #else
39 #define USE_PCI_DMA_API 0
40 #endif
41
42 struct intel_gtt_driver {
43 unsigned int gen : 8;
44 unsigned int is_g33 : 1;
45 unsigned int is_pineview : 1;
46 unsigned int is_ironlake : 1;
47 unsigned int has_pgtbl_enable : 1;
48 unsigned int dma_mask_size : 8;
49 /* Chipset specific GTT setup */
50 int (*setup)(void);
51 /* This should undo anything done in ->setup() save the unmapping
52 * of the mmio register file, that's done in the generic code. */
53 void (*cleanup)(void);
54 void (*write_entry)(dma_addr_t addr, unsigned int entry, unsigned int flags);
55 /* Flags is a more or less chipset specific opaque value.
56 * For chipsets that need to support old ums (non-gem) code, this
57 * needs to be identical to the various supported agp memory types! */
58 bool (*check_flags)(unsigned int flags);
59 void (*chipset_flush)(void);
60 };
61
62 static struct _intel_private {
63 const struct intel_gtt_driver *driver;
64 struct pci_dev *pcidev; /* device one */
65 struct pci_dev *bridge_dev;
66 u8 __iomem *registers;
67 phys_addr_t gtt_phys_addr;
68 u32 PGETBL_save;
69 u32 __iomem *gtt; /* I915G */
70 bool clear_fake_agp; /* on first access via agp, fill with scratch */
71 int num_dcache_entries;
72 void __iomem *i9xx_flush_page;
73 char *i81x_gtt_table;
74 struct resource ifp_resource;
75 int resource_valid;
76 struct page *scratch_page;
77 phys_addr_t scratch_page_dma;
78 int refcount;
79 /* Whether i915 needs to use the dmar apis or not. */
80 unsigned int needs_dmar : 1;
81 phys_addr_t gma_bus_addr;
82 /* Size of memory reserved for graphics by the BIOS */
83 unsigned int stolen_size;
84 /* Total number of gtt entries. */
85 unsigned int gtt_total_entries;
86 /* Part of the gtt that is mappable by the cpu, for those chips where
87 * this is not the full gtt. */
88 unsigned int gtt_mappable_entries;
89 } intel_private;
90
91 #define INTEL_GTT_GEN intel_private.driver->gen
92 #define IS_G33 intel_private.driver->is_g33
93 #define IS_PINEVIEW intel_private.driver->is_pineview
94 #define IS_IRONLAKE intel_private.driver->is_ironlake
95 #define HAS_PGTBL_EN intel_private.driver->has_pgtbl_enable
96
97 #if IS_ENABLED(CONFIG_AGP_INTEL)
98 static int intel_gtt_map_memory(struct page **pages,
99 unsigned int num_entries,
100 struct sg_table *st)
101 {
102 struct scatterlist *sg;
103 int i;
104
105 DBG("try mapping %lu pages\n", (unsigned long)num_entries);
106
107 if (sg_alloc_table(st, num_entries, GFP_KERNEL))
108 goto err;
109
110 for_each_sg(st->sgl, sg, num_entries, i)
111 sg_set_page(sg, pages[i], PAGE_SIZE, 0);
112
113 if (!pci_map_sg(intel_private.pcidev,
114 st->sgl, st->nents, PCI_DMA_BIDIRECTIONAL))
115 goto err;
116
117 return 0;
118
119 err:
120 sg_free_table(st);
121 return -ENOMEM;
122 }
123
124 static void intel_gtt_unmap_memory(struct scatterlist *sg_list, int num_sg)
125 {
126 struct sg_table st;
127 DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
128
129 pci_unmap_sg(intel_private.pcidev, sg_list,
130 num_sg, PCI_DMA_BIDIRECTIONAL);
131
132 st.sgl = sg_list;
133 st.orig_nents = st.nents = num_sg;
134
135 sg_free_table(&st);
136 }
137
138 static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
139 {
140 return;
141 }
142
143 /* Exists to support ARGB cursors */
144 static struct page *i8xx_alloc_pages(void)
145 {
146 struct page *page;
147
148 page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
149 if (page == NULL)
150 return NULL;
151
152 if (set_pages_uc(page, 4) < 0) {
153 set_pages_wb(page, 4);
154 __free_pages(page, 2);
155 return NULL;
156 }
157 atomic_inc(&agp_bridge->current_memory_agp);
158 return page;
159 }
160
161 static void i8xx_destroy_pages(struct page *page)
162 {
163 if (page == NULL)
164 return;
165
166 set_pages_wb(page, 4);
167 __free_pages(page, 2);
168 atomic_dec(&agp_bridge->current_memory_agp);
169 }
170 #endif
171
172 #define I810_GTT_ORDER 4
173 static int i810_setup(void)
174 {
175 phys_addr_t reg_addr;
176 char *gtt_table;
177
178 /* i81x does not preallocate the gtt. It's always 64kb in size. */
179 gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
180 if (gtt_table == NULL)
181 return -ENOMEM;
182 intel_private.i81x_gtt_table = gtt_table;
183
184 reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
185
186 intel_private.registers = ioremap(reg_addr, KB(64));
187 if (!intel_private.registers)
188 return -ENOMEM;
189
190 writel(virt_to_phys(gtt_table) | I810_PGETBL_ENABLED,
191 intel_private.registers+I810_PGETBL_CTL);
192
193 intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
194
195 if ((readl(intel_private.registers+I810_DRAM_CTL)
196 & I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
197 dev_info(&intel_private.pcidev->dev,
198 "detected 4MB dedicated video ram\n");
199 intel_private.num_dcache_entries = 1024;
200 }
201
202 return 0;
203 }
204
205 static void i810_cleanup(void)
206 {
207 writel(0, intel_private.registers+I810_PGETBL_CTL);
208 free_gatt_pages(intel_private.i81x_gtt_table, I810_GTT_ORDER);
209 }
210
211 #if IS_ENABLED(CONFIG_AGP_INTEL)
212 static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
213 int type)
214 {
215 int i;
216
217 if ((pg_start + mem->page_count)
218 > intel_private.num_dcache_entries)
219 return -EINVAL;
220
221 if (!mem->is_flushed)
222 global_cache_flush();
223
224 for (i = pg_start; i < (pg_start + mem->page_count); i++) {
225 dma_addr_t addr = i << PAGE_SHIFT;
226 intel_private.driver->write_entry(addr,
227 i, type);
228 }
229 wmb();
230
231 return 0;
232 }
233
234 /*
235 * The i810/i830 requires a physical address to program its mouse
236 * pointer into hardware.
237 * However the Xserver still writes to it through the agp aperture.
238 */
239 static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
240 {
241 struct agp_memory *new;
242 struct page *page;
243
244 switch (pg_count) {
245 case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
246 break;
247 case 4:
248 /* kludge to get 4 physical pages for ARGB cursor */
249 page = i8xx_alloc_pages();
250 break;
251 default:
252 return NULL;
253 }
254
255 if (page == NULL)
256 return NULL;
257
258 new = agp_create_memory(pg_count);
259 if (new == NULL)
260 return NULL;
261
262 new->pages[0] = page;
263 if (pg_count == 4) {
264 /* kludge to get 4 physical pages for ARGB cursor */
265 new->pages[1] = new->pages[0] + 1;
266 new->pages[2] = new->pages[1] + 1;
267 new->pages[3] = new->pages[2] + 1;
268 }
269 new->page_count = pg_count;
270 new->num_scratch_pages = pg_count;
271 new->type = AGP_PHYS_MEMORY;
272 new->physical = page_to_phys(new->pages[0]);
273 return new;
274 }
275
276 static void intel_i810_free_by_type(struct agp_memory *curr)
277 {
278 agp_free_key(curr->key);
279 if (curr->type == AGP_PHYS_MEMORY) {
280 if (curr->page_count == 4)
281 i8xx_destroy_pages(curr->pages[0]);
282 else {
283 agp_bridge->driver->agp_destroy_page(curr->pages[0],
284 AGP_PAGE_DESTROY_UNMAP);
285 agp_bridge->driver->agp_destroy_page(curr->pages[0],
286 AGP_PAGE_DESTROY_FREE);
287 }
288 agp_free_page_array(curr);
289 }
290 kfree(curr);
291 }
292 #endif
293
294 static int intel_gtt_setup_scratch_page(void)
295 {
296 struct page *page;
297 dma_addr_t dma_addr;
298
299 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
300 if (page == NULL)
301 return -ENOMEM;
302 set_pages_uc(page, 1);
303
304 if (intel_private.needs_dmar) {
305 dma_addr = pci_map_page(intel_private.pcidev, page, 0,
306 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
307 if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
308 return -EINVAL;
309
310 intel_private.scratch_page_dma = dma_addr;
311 } else
312 intel_private.scratch_page_dma = page_to_phys(page);
313
314 intel_private.scratch_page = page;
315
316 return 0;
317 }
318
319 static void i810_write_entry(dma_addr_t addr, unsigned int entry,
320 unsigned int flags)
321 {
322 u32 pte_flags = I810_PTE_VALID;
323
324 switch (flags) {
325 case AGP_DCACHE_MEMORY:
326 pte_flags |= I810_PTE_LOCAL;
327 break;
328 case AGP_USER_CACHED_MEMORY:
329 pte_flags |= I830_PTE_SYSTEM_CACHED;
330 break;
331 }
332
333 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
334 }
335
336 static unsigned int intel_gtt_stolen_size(void)
337 {
338 u16 gmch_ctrl;
339 u8 rdct;
340 int local = 0;
341 static const int ddt[4] = { 0, 16, 32, 64 };
342 unsigned int stolen_size = 0;
343
344 if (INTEL_GTT_GEN == 1)
345 return 0; /* no stolen mem on i81x */
346
347 pci_read_config_word(intel_private.bridge_dev,
348 I830_GMCH_CTRL, &gmch_ctrl);
349
350 if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
351 intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
352 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
353 case I830_GMCH_GMS_STOLEN_512:
354 stolen_size = KB(512);
355 break;
356 case I830_GMCH_GMS_STOLEN_1024:
357 stolen_size = MB(1);
358 break;
359 case I830_GMCH_GMS_STOLEN_8192:
360 stolen_size = MB(8);
361 break;
362 case I830_GMCH_GMS_LOCAL:
363 rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
364 stolen_size = (I830_RDRAM_ND(rdct) + 1) *
365 MB(ddt[I830_RDRAM_DDT(rdct)]);
366 local = 1;
367 break;
368 default:
369 stolen_size = 0;
370 break;
371 }
372 } else {
373 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
374 case I855_GMCH_GMS_STOLEN_1M:
375 stolen_size = MB(1);
376 break;
377 case I855_GMCH_GMS_STOLEN_4M:
378 stolen_size = MB(4);
379 break;
380 case I855_GMCH_GMS_STOLEN_8M:
381 stolen_size = MB(8);
382 break;
383 case I855_GMCH_GMS_STOLEN_16M:
384 stolen_size = MB(16);
385 break;
386 case I855_GMCH_GMS_STOLEN_32M:
387 stolen_size = MB(32);
388 break;
389 case I915_GMCH_GMS_STOLEN_48M:
390 stolen_size = MB(48);
391 break;
392 case I915_GMCH_GMS_STOLEN_64M:
393 stolen_size = MB(64);
394 break;
395 case G33_GMCH_GMS_STOLEN_128M:
396 stolen_size = MB(128);
397 break;
398 case G33_GMCH_GMS_STOLEN_256M:
399 stolen_size = MB(256);
400 break;
401 case INTEL_GMCH_GMS_STOLEN_96M:
402 stolen_size = MB(96);
403 break;
404 case INTEL_GMCH_GMS_STOLEN_160M:
405 stolen_size = MB(160);
406 break;
407 case INTEL_GMCH_GMS_STOLEN_224M:
408 stolen_size = MB(224);
409 break;
410 case INTEL_GMCH_GMS_STOLEN_352M:
411 stolen_size = MB(352);
412 break;
413 default:
414 stolen_size = 0;
415 break;
416 }
417 }
418
419 if (stolen_size > 0) {
420 dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
421 stolen_size / KB(1), local ? "local" : "stolen");
422 } else {
423 dev_info(&intel_private.bridge_dev->dev,
424 "no pre-allocated video memory detected\n");
425 stolen_size = 0;
426 }
427
428 return stolen_size;
429 }
430
431 static void i965_adjust_pgetbl_size(unsigned int size_flag)
432 {
433 u32 pgetbl_ctl, pgetbl_ctl2;
434
435 /* ensure that ppgtt is disabled */
436 pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
437 pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
438 writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
439
440 /* write the new ggtt size */
441 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
442 pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
443 pgetbl_ctl |= size_flag;
444 writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
445 }
446
447 static unsigned int i965_gtt_total_entries(void)
448 {
449 int size;
450 u32 pgetbl_ctl;
451 u16 gmch_ctl;
452
453 pci_read_config_word(intel_private.bridge_dev,
454 I830_GMCH_CTRL, &gmch_ctl);
455
456 if (INTEL_GTT_GEN == 5) {
457 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
458 case G4x_GMCH_SIZE_1M:
459 case G4x_GMCH_SIZE_VT_1M:
460 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
461 break;
462 case G4x_GMCH_SIZE_VT_1_5M:
463 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
464 break;
465 case G4x_GMCH_SIZE_2M:
466 case G4x_GMCH_SIZE_VT_2M:
467 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
468 break;
469 }
470 }
471
472 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
473
474 switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
475 case I965_PGETBL_SIZE_128KB:
476 size = KB(128);
477 break;
478 case I965_PGETBL_SIZE_256KB:
479 size = KB(256);
480 break;
481 case I965_PGETBL_SIZE_512KB:
482 size = KB(512);
483 break;
484 /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
485 case I965_PGETBL_SIZE_1MB:
486 size = KB(1024);
487 break;
488 case I965_PGETBL_SIZE_2MB:
489 size = KB(2048);
490 break;
491 case I965_PGETBL_SIZE_1_5MB:
492 size = KB(1024 + 512);
493 break;
494 default:
495 dev_info(&intel_private.pcidev->dev,
496 "unknown page table size, assuming 512KB\n");
497 size = KB(512);
498 }
499
500 return size/4;
501 }
502
503 static unsigned int intel_gtt_total_entries(void)
504 {
505 if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
506 return i965_gtt_total_entries();
507 else {
508 /* On previous hardware, the GTT size was just what was
509 * required to map the aperture.
510 */
511 return intel_private.gtt_mappable_entries;
512 }
513 }
514
515 static unsigned int intel_gtt_mappable_entries(void)
516 {
517 unsigned int aperture_size;
518
519 if (INTEL_GTT_GEN == 1) {
520 u32 smram_miscc;
521
522 pci_read_config_dword(intel_private.bridge_dev,
523 I810_SMRAM_MISCC, &smram_miscc);
524
525 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
526 == I810_GFX_MEM_WIN_32M)
527 aperture_size = MB(32);
528 else
529 aperture_size = MB(64);
530 } else if (INTEL_GTT_GEN == 2) {
531 u16 gmch_ctrl;
532
533 pci_read_config_word(intel_private.bridge_dev,
534 I830_GMCH_CTRL, &gmch_ctrl);
535
536 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
537 aperture_size = MB(64);
538 else
539 aperture_size = MB(128);
540 } else {
541 /* 9xx supports large sizes, just look at the length */
542 aperture_size = pci_resource_len(intel_private.pcidev, 2);
543 }
544
545 return aperture_size >> PAGE_SHIFT;
546 }
547
548 static void intel_gtt_teardown_scratch_page(void)
549 {
550 set_pages_wb(intel_private.scratch_page, 1);
551 if (intel_private.needs_dmar)
552 pci_unmap_page(intel_private.pcidev,
553 intel_private.scratch_page_dma,
554 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
555 __free_page(intel_private.scratch_page);
556 }
557
558 static void intel_gtt_cleanup(void)
559 {
560 intel_private.driver->cleanup();
561
562 iounmap(intel_private.gtt);
563 iounmap(intel_private.registers);
564
565 intel_gtt_teardown_scratch_page();
566 }
567
568 /* Certain Gen5 chipsets require require idling the GPU before
569 * unmapping anything from the GTT when VT-d is enabled.
570 */
571 static inline int needs_ilk_vtd_wa(void)
572 {
573 #ifdef CONFIG_INTEL_IOMMU
574 const unsigned short gpu_devid = intel_private.pcidev->device;
575
576 /* Query intel_iommu to see if we need the workaround. Presumably that
577 * was loaded first.
578 */
579 if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
580 gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
581 intel_iommu_gfx_mapped)
582 return 1;
583 #endif
584 return 0;
585 }
586
587 static bool intel_gtt_can_wc(void)
588 {
589 if (INTEL_GTT_GEN <= 2)
590 return false;
591
592 if (INTEL_GTT_GEN >= 6)
593 return false;
594
595 /* Reports of major corruption with ILK vt'd enabled */
596 if (needs_ilk_vtd_wa())
597 return false;
598
599 return true;
600 }
601
602 static int intel_gtt_init(void)
603 {
604 u32 gtt_map_size;
605 int ret, bar;
606
607 ret = intel_private.driver->setup();
608 if (ret != 0)
609 return ret;
610
611 intel_private.gtt_mappable_entries = intel_gtt_mappable_entries();
612 intel_private.gtt_total_entries = intel_gtt_total_entries();
613
614 /* save the PGETBL reg for resume */
615 intel_private.PGETBL_save =
616 readl(intel_private.registers+I810_PGETBL_CTL)
617 & ~I810_PGETBL_ENABLED;
618 /* we only ever restore the register when enabling the PGTBL... */
619 if (HAS_PGTBL_EN)
620 intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
621
622 dev_info(&intel_private.bridge_dev->dev,
623 "detected gtt size: %dK total, %dK mappable\n",
624 intel_private.gtt_total_entries * 4,
625 intel_private.gtt_mappable_entries * 4);
626
627 gtt_map_size = intel_private.gtt_total_entries * 4;
628
629 intel_private.gtt = NULL;
630 if (intel_gtt_can_wc())
631 intel_private.gtt = ioremap_wc(intel_private.gtt_phys_addr,
632 gtt_map_size);
633 if (intel_private.gtt == NULL)
634 intel_private.gtt = ioremap(intel_private.gtt_phys_addr,
635 gtt_map_size);
636 if (intel_private.gtt == NULL) {
637 intel_private.driver->cleanup();
638 iounmap(intel_private.registers);
639 return -ENOMEM;
640 }
641
642 #if IS_ENABLED(CONFIG_AGP_INTEL)
643 global_cache_flush(); /* FIXME: ? */
644 #endif
645
646 intel_private.stolen_size = intel_gtt_stolen_size();
647
648 intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
649
650 ret = intel_gtt_setup_scratch_page();
651 if (ret != 0) {
652 intel_gtt_cleanup();
653 return ret;
654 }
655
656 if (INTEL_GTT_GEN <= 2)
657 bar = I810_GMADR_BAR;
658 else
659 bar = I915_GMADR_BAR;
660
661 intel_private.gma_bus_addr = pci_bus_address(intel_private.pcidev, bar);
662 return 0;
663 }
664
665 #if IS_ENABLED(CONFIG_AGP_INTEL)
666 static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
667 {32, 8192, 3},
668 {64, 16384, 4},
669 {128, 32768, 5},
670 {256, 65536, 6},
671 {512, 131072, 7},
672 };
673
674 static int intel_fake_agp_fetch_size(void)
675 {
676 int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
677 unsigned int aper_size;
678 int i;
679
680 aper_size = (intel_private.gtt_mappable_entries << PAGE_SHIFT) / MB(1);
681
682 for (i = 0; i < num_sizes; i++) {
683 if (aper_size == intel_fake_agp_sizes[i].size) {
684 agp_bridge->current_size =
685 (void *) (intel_fake_agp_sizes + i);
686 return aper_size;
687 }
688 }
689
690 return 0;
691 }
692 #endif
693
694 static void i830_cleanup(void)
695 {
696 }
697
698 /* The chipset_flush interface needs to get data that has already been
699 * flushed out of the CPU all the way out to main memory, because the GPU
700 * doesn't snoop those buffers.
701 *
702 * The 8xx series doesn't have the same lovely interface for flushing the
703 * chipset write buffers that the later chips do. According to the 865
704 * specs, it's 64 octwords, or 1KB. So, to get those previous things in
705 * that buffer out, we just fill 1KB and clflush it out, on the assumption
706 * that it'll push whatever was in there out. It appears to work.
707 */
708 static void i830_chipset_flush(void)
709 {
710 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
711
712 /* Forcibly evict everything from the CPU write buffers.
713 * clflush appears to be insufficient.
714 */
715 wbinvd_on_all_cpus();
716
717 /* Now we've only seen documents for this magic bit on 855GM,
718 * we hope it exists for the other gen2 chipsets...
719 *
720 * Also works as advertised on my 845G.
721 */
722 writel(readl(intel_private.registers+I830_HIC) | (1<<31),
723 intel_private.registers+I830_HIC);
724
725 while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
726 if (time_after(jiffies, timeout))
727 break;
728
729 udelay(50);
730 }
731 }
732
733 static void i830_write_entry(dma_addr_t addr, unsigned int entry,
734 unsigned int flags)
735 {
736 u32 pte_flags = I810_PTE_VALID;
737
738 if (flags == AGP_USER_CACHED_MEMORY)
739 pte_flags |= I830_PTE_SYSTEM_CACHED;
740
741 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
742 }
743
744 bool intel_enable_gtt(void)
745 {
746 u8 __iomem *reg;
747
748 if (INTEL_GTT_GEN == 2) {
749 u16 gmch_ctrl;
750
751 pci_read_config_word(intel_private.bridge_dev,
752 I830_GMCH_CTRL, &gmch_ctrl);
753 gmch_ctrl |= I830_GMCH_ENABLED;
754 pci_write_config_word(intel_private.bridge_dev,
755 I830_GMCH_CTRL, gmch_ctrl);
756
757 pci_read_config_word(intel_private.bridge_dev,
758 I830_GMCH_CTRL, &gmch_ctrl);
759 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
760 dev_err(&intel_private.pcidev->dev,
761 "failed to enable the GTT: GMCH_CTRL=%x\n",
762 gmch_ctrl);
763 return false;
764 }
765 }
766
767 /* On the resume path we may be adjusting the PGTBL value, so
768 * be paranoid and flush all chipset write buffers...
769 */
770 if (INTEL_GTT_GEN >= 3)
771 writel(0, intel_private.registers+GFX_FLSH_CNTL);
772
773 reg = intel_private.registers+I810_PGETBL_CTL;
774 writel(intel_private.PGETBL_save, reg);
775 if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
776 dev_err(&intel_private.pcidev->dev,
777 "failed to enable the GTT: PGETBL=%x [expected %x]\n",
778 readl(reg), intel_private.PGETBL_save);
779 return false;
780 }
781
782 if (INTEL_GTT_GEN >= 3)
783 writel(0, intel_private.registers+GFX_FLSH_CNTL);
784
785 return true;
786 }
787 EXPORT_SYMBOL(intel_enable_gtt);
788
789 static int i830_setup(void)
790 {
791 phys_addr_t reg_addr;
792
793 reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
794
795 intel_private.registers = ioremap(reg_addr, KB(64));
796 if (!intel_private.registers)
797 return -ENOMEM;
798
799 intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
800
801 return 0;
802 }
803
804 #if IS_ENABLED(CONFIG_AGP_INTEL)
805 static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
806 {
807 agp_bridge->gatt_table_real = NULL;
808 agp_bridge->gatt_table = NULL;
809 agp_bridge->gatt_bus_addr = 0;
810
811 return 0;
812 }
813
814 static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
815 {
816 return 0;
817 }
818
819 static int intel_fake_agp_configure(void)
820 {
821 if (!intel_enable_gtt())
822 return -EIO;
823
824 intel_private.clear_fake_agp = true;
825 agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
826
827 return 0;
828 }
829 #endif
830
831 static bool i830_check_flags(unsigned int flags)
832 {
833 switch (flags) {
834 case 0:
835 case AGP_PHYS_MEMORY:
836 case AGP_USER_CACHED_MEMORY:
837 case AGP_USER_MEMORY:
838 return true;
839 }
840
841 return false;
842 }
843
844 void intel_gtt_insert_page(dma_addr_t addr,
845 unsigned int pg,
846 unsigned int flags)
847 {
848 intel_private.driver->write_entry(addr, pg, flags);
849 if (intel_private.driver->chipset_flush)
850 intel_private.driver->chipset_flush();
851 }
852 EXPORT_SYMBOL(intel_gtt_insert_page);
853
854 void intel_gtt_insert_sg_entries(struct sg_table *st,
855 unsigned int pg_start,
856 unsigned int flags)
857 {
858 struct scatterlist *sg;
859 unsigned int len, m;
860 int i, j;
861
862 j = pg_start;
863
864 /* sg may merge pages, but we have to separate
865 * per-page addr for GTT */
866 for_each_sg(st->sgl, sg, st->nents, i) {
867 len = sg_dma_len(sg) >> PAGE_SHIFT;
868 for (m = 0; m < len; m++) {
869 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
870 intel_private.driver->write_entry(addr, j, flags);
871 j++;
872 }
873 }
874 wmb();
875 if (intel_private.driver->chipset_flush)
876 intel_private.driver->chipset_flush();
877 }
878 EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
879
880 #if IS_ENABLED(CONFIG_AGP_INTEL)
881 static void intel_gtt_insert_pages(unsigned int first_entry,
882 unsigned int num_entries,
883 struct page **pages,
884 unsigned int flags)
885 {
886 int i, j;
887
888 for (i = 0, j = first_entry; i < num_entries; i++, j++) {
889 dma_addr_t addr = page_to_phys(pages[i]);
890 intel_private.driver->write_entry(addr,
891 j, flags);
892 }
893 wmb();
894 }
895
896 static int intel_fake_agp_insert_entries(struct agp_memory *mem,
897 off_t pg_start, int type)
898 {
899 int ret = -EINVAL;
900
901 if (intel_private.clear_fake_agp) {
902 int start = intel_private.stolen_size / PAGE_SIZE;
903 int end = intel_private.gtt_mappable_entries;
904 intel_gtt_clear_range(start, end - start);
905 intel_private.clear_fake_agp = false;
906 }
907
908 if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
909 return i810_insert_dcache_entries(mem, pg_start, type);
910
911 if (mem->page_count == 0)
912 goto out;
913
914 if (pg_start + mem->page_count > intel_private.gtt_total_entries)
915 goto out_err;
916
917 if (type != mem->type)
918 goto out_err;
919
920 if (!intel_private.driver->check_flags(type))
921 goto out_err;
922
923 if (!mem->is_flushed)
924 global_cache_flush();
925
926 if (intel_private.needs_dmar) {
927 struct sg_table st;
928
929 ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st);
930 if (ret != 0)
931 return ret;
932
933 intel_gtt_insert_sg_entries(&st, pg_start, type);
934 mem->sg_list = st.sgl;
935 mem->num_sg = st.nents;
936 } else
937 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
938 type);
939
940 out:
941 ret = 0;
942 out_err:
943 mem->is_flushed = true;
944 return ret;
945 }
946 #endif
947
948 void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
949 {
950 unsigned int i;
951
952 for (i = first_entry; i < (first_entry + num_entries); i++) {
953 intel_private.driver->write_entry(intel_private.scratch_page_dma,
954 i, 0);
955 }
956 wmb();
957 }
958 EXPORT_SYMBOL(intel_gtt_clear_range);
959
960 #if IS_ENABLED(CONFIG_AGP_INTEL)
961 static int intel_fake_agp_remove_entries(struct agp_memory *mem,
962 off_t pg_start, int type)
963 {
964 if (mem->page_count == 0)
965 return 0;
966
967 intel_gtt_clear_range(pg_start, mem->page_count);
968
969 if (intel_private.needs_dmar) {
970 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
971 mem->sg_list = NULL;
972 mem->num_sg = 0;
973 }
974
975 return 0;
976 }
977
978 static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
979 int type)
980 {
981 struct agp_memory *new;
982
983 if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
984 if (pg_count != intel_private.num_dcache_entries)
985 return NULL;
986
987 new = agp_create_memory(1);
988 if (new == NULL)
989 return NULL;
990
991 new->type = AGP_DCACHE_MEMORY;
992 new->page_count = pg_count;
993 new->num_scratch_pages = 0;
994 agp_free_page_array(new);
995 return new;
996 }
997 if (type == AGP_PHYS_MEMORY)
998 return alloc_agpphysmem_i8xx(pg_count, type);
999 /* always return NULL for other allocation types for now */
1000 return NULL;
1001 }
1002 #endif
1003
1004 static int intel_alloc_chipset_flush_resource(void)
1005 {
1006 int ret;
1007 ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1008 PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1009 pcibios_align_resource, intel_private.bridge_dev);
1010
1011 return ret;
1012 }
1013
1014 static void intel_i915_setup_chipset_flush(void)
1015 {
1016 int ret;
1017 u32 temp;
1018
1019 pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1020 if (!(temp & 0x1)) {
1021 intel_alloc_chipset_flush_resource();
1022 intel_private.resource_valid = 1;
1023 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1024 } else {
1025 temp &= ~1;
1026
1027 intel_private.resource_valid = 1;
1028 intel_private.ifp_resource.start = temp;
1029 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1030 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1031 /* some BIOSes reserve this area in a pnp some don't */
1032 if (ret)
1033 intel_private.resource_valid = 0;
1034 }
1035 }
1036
1037 static void intel_i965_g33_setup_chipset_flush(void)
1038 {
1039 u32 temp_hi, temp_lo;
1040 int ret;
1041
1042 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1043 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1044
1045 if (!(temp_lo & 0x1)) {
1046
1047 intel_alloc_chipset_flush_resource();
1048
1049 intel_private.resource_valid = 1;
1050 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1051 upper_32_bits(intel_private.ifp_resource.start));
1052 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1053 } else {
1054 u64 l64;
1055
1056 temp_lo &= ~0x1;
1057 l64 = ((u64)temp_hi << 32) | temp_lo;
1058
1059 intel_private.resource_valid = 1;
1060 intel_private.ifp_resource.start = l64;
1061 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1062 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1063 /* some BIOSes reserve this area in a pnp some don't */
1064 if (ret)
1065 intel_private.resource_valid = 0;
1066 }
1067 }
1068
1069 static void intel_i9xx_setup_flush(void)
1070 {
1071 /* return if already configured */
1072 if (intel_private.ifp_resource.start)
1073 return;
1074
1075 if (INTEL_GTT_GEN == 6)
1076 return;
1077
1078 /* setup a resource for this object */
1079 intel_private.ifp_resource.name = "Intel Flush Page";
1080 intel_private.ifp_resource.flags = IORESOURCE_MEM;
1081
1082 /* Setup chipset flush for 915 */
1083 if (IS_G33 || INTEL_GTT_GEN >= 4) {
1084 intel_i965_g33_setup_chipset_flush();
1085 } else {
1086 intel_i915_setup_chipset_flush();
1087 }
1088
1089 if (intel_private.ifp_resource.start)
1090 intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
1091 if (!intel_private.i9xx_flush_page)
1092 dev_err(&intel_private.pcidev->dev,
1093 "can't ioremap flush page - no chipset flushing\n");
1094 }
1095
1096 static void i9xx_cleanup(void)
1097 {
1098 if (intel_private.i9xx_flush_page)
1099 iounmap(intel_private.i9xx_flush_page);
1100 if (intel_private.resource_valid)
1101 release_resource(&intel_private.ifp_resource);
1102 intel_private.ifp_resource.start = 0;
1103 intel_private.resource_valid = 0;
1104 }
1105
1106 static void i9xx_chipset_flush(void)
1107 {
1108 if (intel_private.i9xx_flush_page)
1109 writel(1, intel_private.i9xx_flush_page);
1110 }
1111
1112 static void i965_write_entry(dma_addr_t addr,
1113 unsigned int entry,
1114 unsigned int flags)
1115 {
1116 u32 pte_flags;
1117
1118 pte_flags = I810_PTE_VALID;
1119 if (flags == AGP_USER_CACHED_MEMORY)
1120 pte_flags |= I830_PTE_SYSTEM_CACHED;
1121
1122 /* Shift high bits down */
1123 addr |= (addr >> 28) & 0xf0;
1124 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
1125 }
1126
1127 static int i9xx_setup(void)
1128 {
1129 phys_addr_t reg_addr;
1130 int size = KB(512);
1131
1132 reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR);
1133
1134 intel_private.registers = ioremap(reg_addr, size);
1135 if (!intel_private.registers)
1136 return -ENOMEM;
1137
1138 switch (INTEL_GTT_GEN) {
1139 case 3:
1140 intel_private.gtt_phys_addr =
1141 pci_resource_start(intel_private.pcidev, I915_PTE_BAR);
1142 break;
1143 case 5:
1144 intel_private.gtt_phys_addr = reg_addr + MB(2);
1145 break;
1146 default:
1147 intel_private.gtt_phys_addr = reg_addr + KB(512);
1148 break;
1149 }
1150
1151 intel_i9xx_setup_flush();
1152
1153 return 0;
1154 }
1155
1156 #if IS_ENABLED(CONFIG_AGP_INTEL)
1157 static const struct agp_bridge_driver intel_fake_agp_driver = {
1158 .owner = THIS_MODULE,
1159 .size_type = FIXED_APER_SIZE,
1160 .aperture_sizes = intel_fake_agp_sizes,
1161 .num_aperture_sizes = ARRAY_SIZE(intel_fake_agp_sizes),
1162 .configure = intel_fake_agp_configure,
1163 .fetch_size = intel_fake_agp_fetch_size,
1164 .cleanup = intel_gtt_cleanup,
1165 .agp_enable = intel_fake_agp_enable,
1166 .cache_flush = global_cache_flush,
1167 .create_gatt_table = intel_fake_agp_create_gatt_table,
1168 .free_gatt_table = intel_fake_agp_free_gatt_table,
1169 .insert_memory = intel_fake_agp_insert_entries,
1170 .remove_memory = intel_fake_agp_remove_entries,
1171 .alloc_by_type = intel_fake_agp_alloc_by_type,
1172 .free_by_type = intel_i810_free_by_type,
1173 .agp_alloc_page = agp_generic_alloc_page,
1174 .agp_alloc_pages = agp_generic_alloc_pages,
1175 .agp_destroy_page = agp_generic_destroy_page,
1176 .agp_destroy_pages = agp_generic_destroy_pages,
1177 };
1178 #endif
1179
1180 static const struct intel_gtt_driver i81x_gtt_driver = {
1181 .gen = 1,
1182 .has_pgtbl_enable = 1,
1183 .dma_mask_size = 32,
1184 .setup = i810_setup,
1185 .cleanup = i810_cleanup,
1186 .check_flags = i830_check_flags,
1187 .write_entry = i810_write_entry,
1188 };
1189 static const struct intel_gtt_driver i8xx_gtt_driver = {
1190 .gen = 2,
1191 .has_pgtbl_enable = 1,
1192 .setup = i830_setup,
1193 .cleanup = i830_cleanup,
1194 .write_entry = i830_write_entry,
1195 .dma_mask_size = 32,
1196 .check_flags = i830_check_flags,
1197 .chipset_flush = i830_chipset_flush,
1198 };
1199 static const struct intel_gtt_driver i915_gtt_driver = {
1200 .gen = 3,
1201 .has_pgtbl_enable = 1,
1202 .setup = i9xx_setup,
1203 .cleanup = i9xx_cleanup,
1204 /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1205 .write_entry = i830_write_entry,
1206 .dma_mask_size = 32,
1207 .check_flags = i830_check_flags,
1208 .chipset_flush = i9xx_chipset_flush,
1209 };
1210 static const struct intel_gtt_driver g33_gtt_driver = {
1211 .gen = 3,
1212 .is_g33 = 1,
1213 .setup = i9xx_setup,
1214 .cleanup = i9xx_cleanup,
1215 .write_entry = i965_write_entry,
1216 .dma_mask_size = 36,
1217 .check_flags = i830_check_flags,
1218 .chipset_flush = i9xx_chipset_flush,
1219 };
1220 static const struct intel_gtt_driver pineview_gtt_driver = {
1221 .gen = 3,
1222 .is_pineview = 1, .is_g33 = 1,
1223 .setup = i9xx_setup,
1224 .cleanup = i9xx_cleanup,
1225 .write_entry = i965_write_entry,
1226 .dma_mask_size = 36,
1227 .check_flags = i830_check_flags,
1228 .chipset_flush = i9xx_chipset_flush,
1229 };
1230 static const struct intel_gtt_driver i965_gtt_driver = {
1231 .gen = 4,
1232 .has_pgtbl_enable = 1,
1233 .setup = i9xx_setup,
1234 .cleanup = i9xx_cleanup,
1235 .write_entry = i965_write_entry,
1236 .dma_mask_size = 36,
1237 .check_flags = i830_check_flags,
1238 .chipset_flush = i9xx_chipset_flush,
1239 };
1240 static const struct intel_gtt_driver g4x_gtt_driver = {
1241 .gen = 5,
1242 .setup = i9xx_setup,
1243 .cleanup = i9xx_cleanup,
1244 .write_entry = i965_write_entry,
1245 .dma_mask_size = 36,
1246 .check_flags = i830_check_flags,
1247 .chipset_flush = i9xx_chipset_flush,
1248 };
1249 static const struct intel_gtt_driver ironlake_gtt_driver = {
1250 .gen = 5,
1251 .is_ironlake = 1,
1252 .setup = i9xx_setup,
1253 .cleanup = i9xx_cleanup,
1254 .write_entry = i965_write_entry,
1255 .dma_mask_size = 36,
1256 .check_flags = i830_check_flags,
1257 .chipset_flush = i9xx_chipset_flush,
1258 };
1259
1260 /* Table to describe Intel GMCH and AGP/PCIE GART drivers. At least one of
1261 * driver and gmch_driver must be non-null, and find_gmch will determine
1262 * which one should be used if a gmch_chip_id is present.
1263 */
1264 static const struct intel_gtt_driver_description {
1265 unsigned int gmch_chip_id;
1266 char *name;
1267 const struct intel_gtt_driver *gtt_driver;
1268 } intel_gtt_chipsets[] = {
1269 { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1270 &i81x_gtt_driver},
1271 { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1272 &i81x_gtt_driver},
1273 { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1274 &i81x_gtt_driver},
1275 { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1276 &i81x_gtt_driver},
1277 { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1278 &i8xx_gtt_driver},
1279 { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1280 &i8xx_gtt_driver},
1281 { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1282 &i8xx_gtt_driver},
1283 { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1284 &i8xx_gtt_driver},
1285 { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1286 &i8xx_gtt_driver},
1287 { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1288 &i915_gtt_driver },
1289 { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1290 &i915_gtt_driver },
1291 { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1292 &i915_gtt_driver },
1293 { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1294 &i915_gtt_driver },
1295 { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1296 &i915_gtt_driver },
1297 { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1298 &i915_gtt_driver },
1299 { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1300 &i965_gtt_driver },
1301 { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1302 &i965_gtt_driver },
1303 { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1304 &i965_gtt_driver },
1305 { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1306 &i965_gtt_driver },
1307 { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1308 &i965_gtt_driver },
1309 { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1310 &i965_gtt_driver },
1311 { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1312 &g33_gtt_driver },
1313 { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1314 &g33_gtt_driver },
1315 { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1316 &g33_gtt_driver },
1317 { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1318 &pineview_gtt_driver },
1319 { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1320 &pineview_gtt_driver },
1321 { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1322 &g4x_gtt_driver },
1323 { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1324 &g4x_gtt_driver },
1325 { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1326 &g4x_gtt_driver },
1327 { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1328 &g4x_gtt_driver },
1329 { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1330 &g4x_gtt_driver },
1331 { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1332 &g4x_gtt_driver },
1333 { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1334 &g4x_gtt_driver },
1335 { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1336 "HD Graphics", &ironlake_gtt_driver },
1337 { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1338 "HD Graphics", &ironlake_gtt_driver },
1339 { 0, NULL, NULL }
1340 };
1341
1342 static int find_gmch(u16 device)
1343 {
1344 struct pci_dev *gmch_device;
1345
1346 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1347 if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1348 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1349 device, gmch_device);
1350 }
1351
1352 if (!gmch_device)
1353 return 0;
1354
1355 intel_private.pcidev = gmch_device;
1356 return 1;
1357 }
1358
1359 int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
1360 struct agp_bridge_data *bridge)
1361 {
1362 int i, mask;
1363
1364 for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1365 if (gpu_pdev) {
1366 if (gpu_pdev->device ==
1367 intel_gtt_chipsets[i].gmch_chip_id) {
1368 intel_private.pcidev = pci_dev_get(gpu_pdev);
1369 intel_private.driver =
1370 intel_gtt_chipsets[i].gtt_driver;
1371
1372 break;
1373 }
1374 } else if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1375 intel_private.driver =
1376 intel_gtt_chipsets[i].gtt_driver;
1377 break;
1378 }
1379 }
1380
1381 if (!intel_private.driver)
1382 return 0;
1383
1384 #if IS_ENABLED(CONFIG_AGP_INTEL)
1385 if (bridge) {
1386 if (INTEL_GTT_GEN > 1)
1387 return 0;
1388
1389 bridge->driver = &intel_fake_agp_driver;
1390 bridge->dev_private_data = &intel_private;
1391 bridge->dev = bridge_pdev;
1392 }
1393 #endif
1394
1395
1396 /*
1397 * Can be called from the fake agp driver but also directly from
1398 * drm/i915.ko. Hence we need to check whether everything is set up
1399 * already.
1400 */
1401 if (intel_private.refcount++)
1402 return 1;
1403
1404 intel_private.bridge_dev = pci_dev_get(bridge_pdev);
1405
1406 dev_info(&bridge_pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1407
1408 mask = intel_private.driver->dma_mask_size;
1409 if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
1410 dev_err(&intel_private.pcidev->dev,
1411 "set gfx device dma mask %d-bit failed!\n", mask);
1412 else
1413 pci_set_consistent_dma_mask(intel_private.pcidev,
1414 DMA_BIT_MASK(mask));
1415
1416 if (intel_gtt_init() != 0) {
1417 intel_gmch_remove();
1418
1419 return 0;
1420 }
1421
1422 return 1;
1423 }
1424 EXPORT_SYMBOL(intel_gmch_probe);
1425
1426 void intel_gtt_get(u64 *gtt_total,
1427 u32 *stolen_size,
1428 phys_addr_t *mappable_base,
1429 u64 *mappable_end)
1430 {
1431 *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
1432 *stolen_size = intel_private.stolen_size;
1433 *mappable_base = intel_private.gma_bus_addr;
1434 *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT;
1435 }
1436 EXPORT_SYMBOL(intel_gtt_get);
1437
1438 void intel_gtt_chipset_flush(void)
1439 {
1440 if (intel_private.driver->chipset_flush)
1441 intel_private.driver->chipset_flush();
1442 }
1443 EXPORT_SYMBOL(intel_gtt_chipset_flush);
1444
1445 void intel_gmch_remove(void)
1446 {
1447 if (--intel_private.refcount)
1448 return;
1449
1450 if (intel_private.scratch_page)
1451 intel_gtt_teardown_scratch_page();
1452 if (intel_private.pcidev)
1453 pci_dev_put(intel_private.pcidev);
1454 if (intel_private.bridge_dev)
1455 pci_dev_put(intel_private.bridge_dev);
1456 intel_private.driver = NULL;
1457 }
1458 EXPORT_SYMBOL(intel_gmch_remove);
1459
1460 MODULE_AUTHOR("Dave Jones, Various @Intel");
1461 MODULE_LICENSE("GPL and additional rights");
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