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