Loading...
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/iommu.h>
24#include <linux/delay.h>
25#include <asm/smp.h>
26#include "agp.h"
27#include "intel-agp.h"
28#include <drm/intel-gtt.h>
29#include <asm/set_memory.h>
30
31/*
32 * If we have Intel graphics, we're not going to have anything other than
33 * an Intel IOMMU. So make the correct use of the PCI DMA API contingent
34 * on the Intel IOMMU support (CONFIG_INTEL_IOMMU).
35 * Only newer chipsets need to bother with this, of course.
36 */
37#ifdef CONFIG_INTEL_IOMMU
38#define USE_PCI_DMA_API 1
39#else
40#define USE_PCI_DMA_API 0
41#endif
42
43struct intel_gtt_driver {
44 unsigned int gen : 8;
45 unsigned int is_g33 : 1;
46 unsigned int is_pineview : 1;
47 unsigned int is_ironlake : 1;
48 unsigned int has_pgtbl_enable : 1;
49 unsigned int dma_mask_size : 8;
50 /* Chipset specific GTT setup */
51 int (*setup)(void);
52 /* This should undo anything done in ->setup() save the unmapping
53 * of the mmio register file, that's done in the generic code. */
54 void (*cleanup)(void);
55 void (*write_entry)(dma_addr_t addr, unsigned int entry, unsigned int flags);
56 /* Flags is a more or less chipset specific opaque value.
57 * For chipsets that need to support old ums (non-gem) code, this
58 * needs to be identical to the various supported agp memory types! */
59 bool (*check_flags)(unsigned int flags);
60 void (*chipset_flush)(void);
61};
62
63static struct _intel_private {
64 const struct intel_gtt_driver *driver;
65 struct pci_dev *pcidev; /* device one */
66 struct pci_dev *bridge_dev;
67 u8 __iomem *registers;
68 phys_addr_t gtt_phys_addr;
69 u32 PGETBL_save;
70 u32 __iomem *gtt; /* I915G */
71 bool clear_fake_agp; /* on first access via agp, fill with scratch */
72 int num_dcache_entries;
73 void __iomem *i9xx_flush_page;
74 char *i81x_gtt_table;
75 struct resource ifp_resource;
76 int resource_valid;
77 struct page *scratch_page;
78 phys_addr_t scratch_page_dma;
79 int refcount;
80 /* Whether i915 needs to use the dmar apis or not. */
81 unsigned int needs_dmar : 1;
82 phys_addr_t gma_bus_addr;
83 /* Size of memory reserved for graphics by the BIOS */
84 resource_size_t stolen_size;
85 /* Total number of gtt entries. */
86 unsigned int gtt_total_entries;
87 /* Part of the gtt that is mappable by the cpu, for those chips where
88 * this is not the full gtt. */
89 unsigned int gtt_mappable_entries;
90} intel_private;
91
92#define INTEL_GTT_GEN intel_private.driver->gen
93#define IS_G33 intel_private.driver->is_g33
94#define IS_PINEVIEW intel_private.driver->is_pineview
95#define IS_IRONLAKE intel_private.driver->is_ironlake
96#define HAS_PGTBL_EN intel_private.driver->has_pgtbl_enable
97
98#if IS_ENABLED(CONFIG_AGP_INTEL)
99static int intel_gtt_map_memory(struct page **pages,
100 unsigned int num_entries,
101 struct sg_table *st)
102{
103 struct scatterlist *sg;
104 int i;
105
106 DBG("try mapping %lu pages\n", (unsigned long)num_entries);
107
108 if (sg_alloc_table(st, num_entries, GFP_KERNEL))
109 goto err;
110
111 for_each_sg(st->sgl, sg, num_entries, i)
112 sg_set_page(sg, pages[i], PAGE_SIZE, 0);
113
114 if (!dma_map_sg(&intel_private.pcidev->dev, st->sgl, st->nents,
115 DMA_BIDIRECTIONAL))
116 goto err;
117
118 return 0;
119
120err:
121 sg_free_table(st);
122 return -ENOMEM;
123}
124
125static void intel_gtt_unmap_memory(struct scatterlist *sg_list, int num_sg)
126{
127 struct sg_table st;
128 DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
129
130 dma_unmap_sg(&intel_private.pcidev->dev, sg_list, num_sg,
131 DMA_BIDIRECTIONAL);
132
133 st.sgl = sg_list;
134 st.orig_nents = st.nents = num_sg;
135
136 sg_free_table(&st);
137}
138
139static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
140{
141 return;
142}
143
144/* Exists to support ARGB cursors */
145static struct page *i8xx_alloc_pages(void)
146{
147 struct page *page;
148
149 page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
150 if (page == NULL)
151 return NULL;
152
153 if (set_pages_uc(page, 4) < 0) {
154 set_pages_wb(page, 4);
155 __free_pages(page, 2);
156 return NULL;
157 }
158 atomic_inc(&agp_bridge->current_memory_agp);
159 return page;
160}
161
162static void i8xx_destroy_pages(struct page *page)
163{
164 if (page == NULL)
165 return;
166
167 set_pages_wb(page, 4);
168 __free_pages(page, 2);
169 atomic_dec(&agp_bridge->current_memory_agp);
170}
171#endif
172
173#define I810_GTT_ORDER 4
174static int i810_setup(void)
175{
176 phys_addr_t reg_addr;
177 char *gtt_table;
178
179 /* i81x does not preallocate the gtt. It's always 64kb in size. */
180 gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
181 if (gtt_table == NULL)
182 return -ENOMEM;
183 intel_private.i81x_gtt_table = gtt_table;
184
185 reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
186
187 intel_private.registers = ioremap(reg_addr, KB(64));
188 if (!intel_private.registers)
189 return -ENOMEM;
190
191 writel(virt_to_phys(gtt_table) | I810_PGETBL_ENABLED,
192 intel_private.registers+I810_PGETBL_CTL);
193
194 intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
195
196 if ((readl(intel_private.registers+I810_DRAM_CTL)
197 & I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
198 dev_info(&intel_private.pcidev->dev,
199 "detected 4MB dedicated video ram\n");
200 intel_private.num_dcache_entries = 1024;
201 }
202
203 return 0;
204}
205
206static void i810_cleanup(void)
207{
208 writel(0, intel_private.registers+I810_PGETBL_CTL);
209 free_gatt_pages(intel_private.i81x_gtt_table, I810_GTT_ORDER);
210}
211
212#if IS_ENABLED(CONFIG_AGP_INTEL)
213static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
214 int type)
215{
216 int i;
217
218 if ((pg_start + mem->page_count)
219 > intel_private.num_dcache_entries)
220 return -EINVAL;
221
222 if (!mem->is_flushed)
223 global_cache_flush();
224
225 for (i = pg_start; i < (pg_start + mem->page_count); i++) {
226 dma_addr_t addr = i << PAGE_SHIFT;
227 intel_private.driver->write_entry(addr,
228 i, type);
229 }
230 wmb();
231
232 return 0;
233}
234
235/*
236 * The i810/i830 requires a physical address to program its mouse
237 * pointer into hardware.
238 * However the Xserver still writes to it through the agp aperture.
239 */
240static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
241{
242 struct agp_memory *new;
243 struct page *page;
244
245 switch (pg_count) {
246 case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
247 break;
248 case 4:
249 /* kludge to get 4 physical pages for ARGB cursor */
250 page = i8xx_alloc_pages();
251 break;
252 default:
253 return NULL;
254 }
255
256 if (page == NULL)
257 return NULL;
258
259 new = agp_create_memory(pg_count);
260 if (new == NULL)
261 return NULL;
262
263 new->pages[0] = page;
264 if (pg_count == 4) {
265 /* kludge to get 4 physical pages for ARGB cursor */
266 new->pages[1] = new->pages[0] + 1;
267 new->pages[2] = new->pages[1] + 1;
268 new->pages[3] = new->pages[2] + 1;
269 }
270 new->page_count = pg_count;
271 new->num_scratch_pages = pg_count;
272 new->type = AGP_PHYS_MEMORY;
273 new->physical = page_to_phys(new->pages[0]);
274 return new;
275}
276
277static void intel_i810_free_by_type(struct agp_memory *curr)
278{
279 agp_free_key(curr->key);
280 if (curr->type == AGP_PHYS_MEMORY) {
281 if (curr->page_count == 4)
282 i8xx_destroy_pages(curr->pages[0]);
283 else {
284 agp_bridge->driver->agp_destroy_page(curr->pages[0],
285 AGP_PAGE_DESTROY_UNMAP);
286 agp_bridge->driver->agp_destroy_page(curr->pages[0],
287 AGP_PAGE_DESTROY_FREE);
288 }
289 agp_free_page_array(curr);
290 }
291 kfree(curr);
292}
293#endif
294
295static int intel_gtt_setup_scratch_page(void)
296{
297 struct page *page;
298 dma_addr_t dma_addr;
299
300 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
301 if (page == NULL)
302 return -ENOMEM;
303 set_pages_uc(page, 1);
304
305 if (intel_private.needs_dmar) {
306 dma_addr = dma_map_page(&intel_private.pcidev->dev, page, 0,
307 PAGE_SIZE, DMA_BIDIRECTIONAL);
308 if (dma_mapping_error(&intel_private.pcidev->dev, dma_addr)) {
309 __free_page(page);
310 return -EINVAL;
311 }
312
313 intel_private.scratch_page_dma = dma_addr;
314 } else
315 intel_private.scratch_page_dma = page_to_phys(page);
316
317 intel_private.scratch_page = page;
318
319 return 0;
320}
321
322static void i810_write_entry(dma_addr_t addr, unsigned int entry,
323 unsigned int flags)
324{
325 u32 pte_flags = I810_PTE_VALID;
326
327 switch (flags) {
328 case AGP_DCACHE_MEMORY:
329 pte_flags |= I810_PTE_LOCAL;
330 break;
331 case AGP_USER_CACHED_MEMORY:
332 pte_flags |= I830_PTE_SYSTEM_CACHED;
333 break;
334 }
335
336 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
337}
338
339static resource_size_t intel_gtt_stolen_size(void)
340{
341 u16 gmch_ctrl;
342 u8 rdct;
343 int local = 0;
344 static const int ddt[4] = { 0, 16, 32, 64 };
345 resource_size_t stolen_size = 0;
346
347 if (INTEL_GTT_GEN == 1)
348 return 0; /* no stolen mem on i81x */
349
350 pci_read_config_word(intel_private.bridge_dev,
351 I830_GMCH_CTRL, &gmch_ctrl);
352
353 if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
354 intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
355 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
356 case I830_GMCH_GMS_STOLEN_512:
357 stolen_size = KB(512);
358 break;
359 case I830_GMCH_GMS_STOLEN_1024:
360 stolen_size = MB(1);
361 break;
362 case I830_GMCH_GMS_STOLEN_8192:
363 stolen_size = MB(8);
364 break;
365 case I830_GMCH_GMS_LOCAL:
366 rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
367 stolen_size = (I830_RDRAM_ND(rdct) + 1) *
368 MB(ddt[I830_RDRAM_DDT(rdct)]);
369 local = 1;
370 break;
371 default:
372 stolen_size = 0;
373 break;
374 }
375 } else {
376 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
377 case I855_GMCH_GMS_STOLEN_1M:
378 stolen_size = MB(1);
379 break;
380 case I855_GMCH_GMS_STOLEN_4M:
381 stolen_size = MB(4);
382 break;
383 case I855_GMCH_GMS_STOLEN_8M:
384 stolen_size = MB(8);
385 break;
386 case I855_GMCH_GMS_STOLEN_16M:
387 stolen_size = MB(16);
388 break;
389 case I855_GMCH_GMS_STOLEN_32M:
390 stolen_size = MB(32);
391 break;
392 case I915_GMCH_GMS_STOLEN_48M:
393 stolen_size = MB(48);
394 break;
395 case I915_GMCH_GMS_STOLEN_64M:
396 stolen_size = MB(64);
397 break;
398 case G33_GMCH_GMS_STOLEN_128M:
399 stolen_size = MB(128);
400 break;
401 case G33_GMCH_GMS_STOLEN_256M:
402 stolen_size = MB(256);
403 break;
404 case INTEL_GMCH_GMS_STOLEN_96M:
405 stolen_size = MB(96);
406 break;
407 case INTEL_GMCH_GMS_STOLEN_160M:
408 stolen_size = MB(160);
409 break;
410 case INTEL_GMCH_GMS_STOLEN_224M:
411 stolen_size = MB(224);
412 break;
413 case INTEL_GMCH_GMS_STOLEN_352M:
414 stolen_size = MB(352);
415 break;
416 default:
417 stolen_size = 0;
418 break;
419 }
420 }
421
422 if (stolen_size > 0) {
423 dev_info(&intel_private.bridge_dev->dev, "detected %lluK %s memory\n",
424 (u64)stolen_size / KB(1), local ? "local" : "stolen");
425 } else {
426 dev_info(&intel_private.bridge_dev->dev,
427 "no pre-allocated video memory detected\n");
428 stolen_size = 0;
429 }
430
431 return stolen_size;
432}
433
434static void i965_adjust_pgetbl_size(unsigned int size_flag)
435{
436 u32 pgetbl_ctl, pgetbl_ctl2;
437
438 /* ensure that ppgtt is disabled */
439 pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
440 pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
441 writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
442
443 /* write the new ggtt size */
444 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
445 pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
446 pgetbl_ctl |= size_flag;
447 writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
448}
449
450static unsigned int i965_gtt_total_entries(void)
451{
452 int size;
453 u32 pgetbl_ctl;
454 u16 gmch_ctl;
455
456 pci_read_config_word(intel_private.bridge_dev,
457 I830_GMCH_CTRL, &gmch_ctl);
458
459 if (INTEL_GTT_GEN == 5) {
460 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
461 case G4x_GMCH_SIZE_1M:
462 case G4x_GMCH_SIZE_VT_1M:
463 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
464 break;
465 case G4x_GMCH_SIZE_VT_1_5M:
466 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
467 break;
468 case G4x_GMCH_SIZE_2M:
469 case G4x_GMCH_SIZE_VT_2M:
470 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
471 break;
472 }
473 }
474
475 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
476
477 switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
478 case I965_PGETBL_SIZE_128KB:
479 size = KB(128);
480 break;
481 case I965_PGETBL_SIZE_256KB:
482 size = KB(256);
483 break;
484 case I965_PGETBL_SIZE_512KB:
485 size = KB(512);
486 break;
487 /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
488 case I965_PGETBL_SIZE_1MB:
489 size = KB(1024);
490 break;
491 case I965_PGETBL_SIZE_2MB:
492 size = KB(2048);
493 break;
494 case I965_PGETBL_SIZE_1_5MB:
495 size = KB(1024 + 512);
496 break;
497 default:
498 dev_info(&intel_private.pcidev->dev,
499 "unknown page table size, assuming 512KB\n");
500 size = KB(512);
501 }
502
503 return size/4;
504}
505
506static unsigned int intel_gtt_total_entries(void)
507{
508 if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
509 return i965_gtt_total_entries();
510 else {
511 /* On previous hardware, the GTT size was just what was
512 * required to map the aperture.
513 */
514 return intel_private.gtt_mappable_entries;
515 }
516}
517
518static unsigned int intel_gtt_mappable_entries(void)
519{
520 unsigned int aperture_size;
521
522 if (INTEL_GTT_GEN == 1) {
523 u32 smram_miscc;
524
525 pci_read_config_dword(intel_private.bridge_dev,
526 I810_SMRAM_MISCC, &smram_miscc);
527
528 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
529 == I810_GFX_MEM_WIN_32M)
530 aperture_size = MB(32);
531 else
532 aperture_size = MB(64);
533 } else if (INTEL_GTT_GEN == 2) {
534 u16 gmch_ctrl;
535
536 pci_read_config_word(intel_private.bridge_dev,
537 I830_GMCH_CTRL, &gmch_ctrl);
538
539 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
540 aperture_size = MB(64);
541 else
542 aperture_size = MB(128);
543 } else {
544 /* 9xx supports large sizes, just look at the length */
545 aperture_size = pci_resource_len(intel_private.pcidev, 2);
546 }
547
548 return aperture_size >> PAGE_SHIFT;
549}
550
551static void intel_gtt_teardown_scratch_page(void)
552{
553 set_pages_wb(intel_private.scratch_page, 1);
554 if (intel_private.needs_dmar)
555 dma_unmap_page(&intel_private.pcidev->dev,
556 intel_private.scratch_page_dma, PAGE_SIZE,
557 DMA_BIDIRECTIONAL);
558 __free_page(intel_private.scratch_page);
559}
560
561static void intel_gtt_cleanup(void)
562{
563 intel_private.driver->cleanup();
564
565 iounmap(intel_private.gtt);
566 iounmap(intel_private.registers);
567
568 intel_gtt_teardown_scratch_page();
569}
570
571/* Certain Gen5 chipsets require require idling the GPU before
572 * unmapping anything from the GTT when VT-d is enabled.
573 */
574static inline int needs_ilk_vtd_wa(void)
575{
576 const unsigned short gpu_devid = intel_private.pcidev->device;
577
578 /*
579 * Query iommu subsystem to see if we need the workaround. Presumably
580 * that was loaded first.
581 */
582 return ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
583 gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
584 device_iommu_mapped(&intel_private.pcidev->dev));
585}
586
587static 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
602static 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)
666static 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
674static 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
694static 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 */
708static 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
733static 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
744bool intel_gmch_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}
787EXPORT_SYMBOL(intel_gmch_enable_gtt);
788
789static 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)
805static 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
814static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
815{
816 return 0;
817}
818
819static int intel_fake_agp_configure(void)
820{
821 if (!intel_gmch_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
831static 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
844void intel_gmch_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 readl(intel_private.gtt + pg);
850 if (intel_private.driver->chipset_flush)
851 intel_private.driver->chipset_flush();
852}
853EXPORT_SYMBOL(intel_gmch_gtt_insert_page);
854
855void intel_gmch_gtt_insert_sg_entries(struct sg_table *st,
856 unsigned int pg_start,
857 unsigned int flags)
858{
859 struct scatterlist *sg;
860 unsigned int len, m;
861 int i, j;
862
863 j = pg_start;
864
865 /* sg may merge pages, but we have to separate
866 * per-page addr for GTT */
867 for_each_sg(st->sgl, sg, st->nents, i) {
868 len = sg_dma_len(sg) >> PAGE_SHIFT;
869 for (m = 0; m < len; m++) {
870 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
871 intel_private.driver->write_entry(addr, j, flags);
872 j++;
873 }
874 }
875 readl(intel_private.gtt + j - 1);
876 if (intel_private.driver->chipset_flush)
877 intel_private.driver->chipset_flush();
878}
879EXPORT_SYMBOL(intel_gmch_gtt_insert_sg_entries);
880
881#if IS_ENABLED(CONFIG_AGP_INTEL)
882static void intel_gmch_gtt_insert_pages(unsigned int first_entry,
883 unsigned int num_entries,
884 struct page **pages,
885 unsigned int flags)
886{
887 int i, j;
888
889 for (i = 0, j = first_entry; i < num_entries; i++, j++) {
890 dma_addr_t addr = page_to_phys(pages[i]);
891 intel_private.driver->write_entry(addr,
892 j, flags);
893 }
894 wmb();
895}
896
897static int intel_fake_agp_insert_entries(struct agp_memory *mem,
898 off_t pg_start, int type)
899{
900 int ret = -EINVAL;
901
902 if (intel_private.clear_fake_agp) {
903 int start = intel_private.stolen_size / PAGE_SIZE;
904 int end = intel_private.gtt_mappable_entries;
905 intel_gmch_gtt_clear_range(start, end - start);
906 intel_private.clear_fake_agp = false;
907 }
908
909 if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
910 return i810_insert_dcache_entries(mem, pg_start, type);
911
912 if (mem->page_count == 0)
913 goto out;
914
915 if (pg_start + mem->page_count > intel_private.gtt_total_entries)
916 goto out_err;
917
918 if (type != mem->type)
919 goto out_err;
920
921 if (!intel_private.driver->check_flags(type))
922 goto out_err;
923
924 if (!mem->is_flushed)
925 global_cache_flush();
926
927 if (intel_private.needs_dmar) {
928 struct sg_table st;
929
930 ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st);
931 if (ret != 0)
932 return ret;
933
934 intel_gmch_gtt_insert_sg_entries(&st, pg_start, type);
935 mem->sg_list = st.sgl;
936 mem->num_sg = st.nents;
937 } else
938 intel_gmch_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
939 type);
940
941out:
942 ret = 0;
943out_err:
944 mem->is_flushed = true;
945 return ret;
946}
947#endif
948
949void intel_gmch_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
950{
951 unsigned int i;
952
953 for (i = first_entry; i < (first_entry + num_entries); i++) {
954 intel_private.driver->write_entry(intel_private.scratch_page_dma,
955 i, 0);
956 }
957 wmb();
958}
959EXPORT_SYMBOL(intel_gmch_gtt_clear_range);
960
961#if IS_ENABLED(CONFIG_AGP_INTEL)
962static int intel_fake_agp_remove_entries(struct agp_memory *mem,
963 off_t pg_start, int type)
964{
965 if (mem->page_count == 0)
966 return 0;
967
968 intel_gmch_gtt_clear_range(pg_start, mem->page_count);
969
970 if (intel_private.needs_dmar) {
971 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
972 mem->sg_list = NULL;
973 mem->num_sg = 0;
974 }
975
976 return 0;
977}
978
979static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
980 int type)
981{
982 struct agp_memory *new;
983
984 if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
985 if (pg_count != intel_private.num_dcache_entries)
986 return NULL;
987
988 new = agp_create_memory(1);
989 if (new == NULL)
990 return NULL;
991
992 new->type = AGP_DCACHE_MEMORY;
993 new->page_count = pg_count;
994 new->num_scratch_pages = 0;
995 agp_free_page_array(new);
996 return new;
997 }
998 if (type == AGP_PHYS_MEMORY)
999 return alloc_agpphysmem_i8xx(pg_count, type);
1000 /* always return NULL for other allocation types for now */
1001 return NULL;
1002}
1003#endif
1004
1005static int intel_alloc_chipset_flush_resource(void)
1006{
1007 int ret;
1008 ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1009 PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1010 pcibios_align_resource, intel_private.bridge_dev);
1011
1012 return ret;
1013}
1014
1015static void intel_i915_setup_chipset_flush(void)
1016{
1017 int ret;
1018 u32 temp;
1019
1020 pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1021 if (!(temp & 0x1)) {
1022 intel_alloc_chipset_flush_resource();
1023 intel_private.resource_valid = 1;
1024 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1025 } else {
1026 temp &= ~1;
1027
1028 intel_private.resource_valid = 1;
1029 intel_private.ifp_resource.start = temp;
1030 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1031 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1032 /* some BIOSes reserve this area in a pnp some don't */
1033 if (ret)
1034 intel_private.resource_valid = 0;
1035 }
1036}
1037
1038static void intel_i965_g33_setup_chipset_flush(void)
1039{
1040 u32 temp_hi, temp_lo;
1041 int ret;
1042
1043 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1044 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1045
1046 if (!(temp_lo & 0x1)) {
1047
1048 intel_alloc_chipset_flush_resource();
1049
1050 intel_private.resource_valid = 1;
1051 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1052 upper_32_bits(intel_private.ifp_resource.start));
1053 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1054 } else {
1055 u64 l64;
1056
1057 temp_lo &= ~0x1;
1058 l64 = ((u64)temp_hi << 32) | temp_lo;
1059
1060 intel_private.resource_valid = 1;
1061 intel_private.ifp_resource.start = l64;
1062 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1063 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1064 /* some BIOSes reserve this area in a pnp some don't */
1065 if (ret)
1066 intel_private.resource_valid = 0;
1067 }
1068}
1069
1070static void intel_i9xx_setup_flush(void)
1071{
1072 /* return if already configured */
1073 if (intel_private.ifp_resource.start)
1074 return;
1075
1076 if (INTEL_GTT_GEN == 6)
1077 return;
1078
1079 /* setup a resource for this object */
1080 intel_private.ifp_resource.name = "Intel Flush Page";
1081 intel_private.ifp_resource.flags = IORESOURCE_MEM;
1082
1083 /* Setup chipset flush for 915 */
1084 if (IS_G33 || INTEL_GTT_GEN >= 4) {
1085 intel_i965_g33_setup_chipset_flush();
1086 } else {
1087 intel_i915_setup_chipset_flush();
1088 }
1089
1090 if (intel_private.ifp_resource.start)
1091 intel_private.i9xx_flush_page = ioremap(intel_private.ifp_resource.start, PAGE_SIZE);
1092 if (!intel_private.i9xx_flush_page)
1093 dev_err(&intel_private.pcidev->dev,
1094 "can't ioremap flush page - no chipset flushing\n");
1095}
1096
1097static void i9xx_cleanup(void)
1098{
1099 if (intel_private.i9xx_flush_page)
1100 iounmap(intel_private.i9xx_flush_page);
1101 if (intel_private.resource_valid)
1102 release_resource(&intel_private.ifp_resource);
1103 intel_private.ifp_resource.start = 0;
1104 intel_private.resource_valid = 0;
1105}
1106
1107static void i9xx_chipset_flush(void)
1108{
1109 wmb();
1110 if (intel_private.i9xx_flush_page)
1111 writel(1, intel_private.i9xx_flush_page);
1112}
1113
1114static void i965_write_entry(dma_addr_t addr,
1115 unsigned int entry,
1116 unsigned int flags)
1117{
1118 u32 pte_flags;
1119
1120 pte_flags = I810_PTE_VALID;
1121 if (flags == AGP_USER_CACHED_MEMORY)
1122 pte_flags |= I830_PTE_SYSTEM_CACHED;
1123
1124 /* Shift high bits down */
1125 addr |= (addr >> 28) & 0xf0;
1126 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
1127}
1128
1129static int i9xx_setup(void)
1130{
1131 phys_addr_t reg_addr;
1132 int size = KB(512);
1133
1134 reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR);
1135
1136 intel_private.registers = ioremap(reg_addr, size);
1137 if (!intel_private.registers)
1138 return -ENOMEM;
1139
1140 switch (INTEL_GTT_GEN) {
1141 case 3:
1142 intel_private.gtt_phys_addr =
1143 pci_resource_start(intel_private.pcidev, I915_PTE_BAR);
1144 break;
1145 case 5:
1146 intel_private.gtt_phys_addr = reg_addr + MB(2);
1147 break;
1148 default:
1149 intel_private.gtt_phys_addr = reg_addr + KB(512);
1150 break;
1151 }
1152
1153 intel_i9xx_setup_flush();
1154
1155 return 0;
1156}
1157
1158#if IS_ENABLED(CONFIG_AGP_INTEL)
1159static const struct agp_bridge_driver intel_fake_agp_driver = {
1160 .owner = THIS_MODULE,
1161 .size_type = FIXED_APER_SIZE,
1162 .aperture_sizes = intel_fake_agp_sizes,
1163 .num_aperture_sizes = ARRAY_SIZE(intel_fake_agp_sizes),
1164 .configure = intel_fake_agp_configure,
1165 .fetch_size = intel_fake_agp_fetch_size,
1166 .cleanup = intel_gtt_cleanup,
1167 .agp_enable = intel_fake_agp_enable,
1168 .cache_flush = global_cache_flush,
1169 .create_gatt_table = intel_fake_agp_create_gatt_table,
1170 .free_gatt_table = intel_fake_agp_free_gatt_table,
1171 .insert_memory = intel_fake_agp_insert_entries,
1172 .remove_memory = intel_fake_agp_remove_entries,
1173 .alloc_by_type = intel_fake_agp_alloc_by_type,
1174 .free_by_type = intel_i810_free_by_type,
1175 .agp_alloc_page = agp_generic_alloc_page,
1176 .agp_alloc_pages = agp_generic_alloc_pages,
1177 .agp_destroy_page = agp_generic_destroy_page,
1178 .agp_destroy_pages = agp_generic_destroy_pages,
1179};
1180#endif
1181
1182static const struct intel_gtt_driver i81x_gtt_driver = {
1183 .gen = 1,
1184 .has_pgtbl_enable = 1,
1185 .dma_mask_size = 32,
1186 .setup = i810_setup,
1187 .cleanup = i810_cleanup,
1188 .check_flags = i830_check_flags,
1189 .write_entry = i810_write_entry,
1190};
1191static const struct intel_gtt_driver i8xx_gtt_driver = {
1192 .gen = 2,
1193 .has_pgtbl_enable = 1,
1194 .setup = i830_setup,
1195 .cleanup = i830_cleanup,
1196 .write_entry = i830_write_entry,
1197 .dma_mask_size = 32,
1198 .check_flags = i830_check_flags,
1199 .chipset_flush = i830_chipset_flush,
1200};
1201static const struct intel_gtt_driver i915_gtt_driver = {
1202 .gen = 3,
1203 .has_pgtbl_enable = 1,
1204 .setup = i9xx_setup,
1205 .cleanup = i9xx_cleanup,
1206 /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1207 .write_entry = i830_write_entry,
1208 .dma_mask_size = 32,
1209 .check_flags = i830_check_flags,
1210 .chipset_flush = i9xx_chipset_flush,
1211};
1212static const struct intel_gtt_driver g33_gtt_driver = {
1213 .gen = 3,
1214 .is_g33 = 1,
1215 .setup = i9xx_setup,
1216 .cleanup = i9xx_cleanup,
1217 .write_entry = i965_write_entry,
1218 .dma_mask_size = 36,
1219 .check_flags = i830_check_flags,
1220 .chipset_flush = i9xx_chipset_flush,
1221};
1222static const struct intel_gtt_driver pineview_gtt_driver = {
1223 .gen = 3,
1224 .is_pineview = 1, .is_g33 = 1,
1225 .setup = i9xx_setup,
1226 .cleanup = i9xx_cleanup,
1227 .write_entry = i965_write_entry,
1228 .dma_mask_size = 36,
1229 .check_flags = i830_check_flags,
1230 .chipset_flush = i9xx_chipset_flush,
1231};
1232static const struct intel_gtt_driver i965_gtt_driver = {
1233 .gen = 4,
1234 .has_pgtbl_enable = 1,
1235 .setup = i9xx_setup,
1236 .cleanup = i9xx_cleanup,
1237 .write_entry = i965_write_entry,
1238 .dma_mask_size = 36,
1239 .check_flags = i830_check_flags,
1240 .chipset_flush = i9xx_chipset_flush,
1241};
1242static const struct intel_gtt_driver g4x_gtt_driver = {
1243 .gen = 5,
1244 .setup = i9xx_setup,
1245 .cleanup = i9xx_cleanup,
1246 .write_entry = i965_write_entry,
1247 .dma_mask_size = 36,
1248 .check_flags = i830_check_flags,
1249 .chipset_flush = i9xx_chipset_flush,
1250};
1251static const struct intel_gtt_driver ironlake_gtt_driver = {
1252 .gen = 5,
1253 .is_ironlake = 1,
1254 .setup = i9xx_setup,
1255 .cleanup = i9xx_cleanup,
1256 .write_entry = i965_write_entry,
1257 .dma_mask_size = 36,
1258 .check_flags = i830_check_flags,
1259 .chipset_flush = i9xx_chipset_flush,
1260};
1261
1262/* Table to describe Intel GMCH and AGP/PCIE GART drivers. At least one of
1263 * driver and gmch_driver must be non-null, and find_gmch will determine
1264 * which one should be used if a gmch_chip_id is present.
1265 */
1266static const struct intel_gtt_driver_description {
1267 unsigned int gmch_chip_id;
1268 char *name;
1269 const struct intel_gtt_driver *gtt_driver;
1270} intel_gtt_chipsets[] = {
1271 { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1272 &i81x_gtt_driver},
1273 { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1274 &i81x_gtt_driver},
1275 { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1276 &i81x_gtt_driver},
1277 { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1278 &i81x_gtt_driver},
1279 { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1280 &i8xx_gtt_driver},
1281 { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1282 &i8xx_gtt_driver},
1283 { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1284 &i8xx_gtt_driver},
1285 { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1286 &i8xx_gtt_driver},
1287 { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1288 &i8xx_gtt_driver},
1289 { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1290 &i915_gtt_driver },
1291 { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1292 &i915_gtt_driver },
1293 { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1294 &i915_gtt_driver },
1295 { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1296 &i915_gtt_driver },
1297 { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1298 &i915_gtt_driver },
1299 { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1300 &i915_gtt_driver },
1301 { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1302 &i965_gtt_driver },
1303 { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1304 &i965_gtt_driver },
1305 { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1306 &i965_gtt_driver },
1307 { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1308 &i965_gtt_driver },
1309 { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1310 &i965_gtt_driver },
1311 { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1312 &i965_gtt_driver },
1313 { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1314 &g33_gtt_driver },
1315 { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1316 &g33_gtt_driver },
1317 { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1318 &g33_gtt_driver },
1319 { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1320 &pineview_gtt_driver },
1321 { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1322 &pineview_gtt_driver },
1323 { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1324 &g4x_gtt_driver },
1325 { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1326 &g4x_gtt_driver },
1327 { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1328 &g4x_gtt_driver },
1329 { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1330 &g4x_gtt_driver },
1331 { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1332 &g4x_gtt_driver },
1333 { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1334 &g4x_gtt_driver },
1335 { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1336 &g4x_gtt_driver },
1337 { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1338 "HD Graphics", &ironlake_gtt_driver },
1339 { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1340 "HD Graphics", &ironlake_gtt_driver },
1341 { 0, NULL, NULL }
1342};
1343
1344static int find_gmch(u16 device)
1345{
1346 struct pci_dev *gmch_device;
1347
1348 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1349 if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1350 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1351 device, gmch_device);
1352 }
1353
1354 if (!gmch_device)
1355 return 0;
1356
1357 intel_private.pcidev = gmch_device;
1358 return 1;
1359}
1360
1361int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
1362 struct agp_bridge_data *bridge)
1363{
1364 int i, mask;
1365
1366 for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1367 if (gpu_pdev) {
1368 if (gpu_pdev->device ==
1369 intel_gtt_chipsets[i].gmch_chip_id) {
1370 intel_private.pcidev = pci_dev_get(gpu_pdev);
1371 intel_private.driver =
1372 intel_gtt_chipsets[i].gtt_driver;
1373
1374 break;
1375 }
1376 } else if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1377 intel_private.driver =
1378 intel_gtt_chipsets[i].gtt_driver;
1379 break;
1380 }
1381 }
1382
1383 if (!intel_private.driver)
1384 return 0;
1385
1386#if IS_ENABLED(CONFIG_AGP_INTEL)
1387 if (bridge) {
1388 if (INTEL_GTT_GEN > 1)
1389 return 0;
1390
1391 bridge->driver = &intel_fake_agp_driver;
1392 bridge->dev_private_data = &intel_private;
1393 bridge->dev = bridge_pdev;
1394 }
1395#endif
1396
1397
1398 /*
1399 * Can be called from the fake agp driver but also directly from
1400 * drm/i915.ko. Hence we need to check whether everything is set up
1401 * already.
1402 */
1403 if (intel_private.refcount++)
1404 return 1;
1405
1406 intel_private.bridge_dev = pci_dev_get(bridge_pdev);
1407
1408 dev_info(&bridge_pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1409
1410 if (bridge) {
1411 mask = intel_private.driver->dma_mask_size;
1412 if (dma_set_mask(&intel_private.pcidev->dev, DMA_BIT_MASK(mask)))
1413 dev_err(&intel_private.pcidev->dev,
1414 "set gfx device dma mask %d-bit failed!\n",
1415 mask);
1416 else
1417 dma_set_coherent_mask(&intel_private.pcidev->dev,
1418 DMA_BIT_MASK(mask));
1419 }
1420
1421 if (intel_gtt_init() != 0) {
1422 intel_gmch_remove();
1423
1424 return 0;
1425 }
1426
1427 return 1;
1428}
1429EXPORT_SYMBOL(intel_gmch_probe);
1430
1431void intel_gmch_gtt_get(u64 *gtt_total,
1432 phys_addr_t *mappable_base,
1433 resource_size_t *mappable_end)
1434{
1435 *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
1436 *mappable_base = intel_private.gma_bus_addr;
1437 *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT;
1438}
1439EXPORT_SYMBOL(intel_gmch_gtt_get);
1440
1441void intel_gmch_gtt_flush(void)
1442{
1443 if (intel_private.driver->chipset_flush)
1444 intel_private.driver->chipset_flush();
1445}
1446EXPORT_SYMBOL(intel_gmch_gtt_flush);
1447
1448void intel_gmch_remove(void)
1449{
1450 if (--intel_private.refcount)
1451 return;
1452
1453 if (intel_private.scratch_page)
1454 intel_gtt_teardown_scratch_page();
1455 if (intel_private.pcidev)
1456 pci_dev_put(intel_private.pcidev);
1457 if (intel_private.bridge_dev)
1458 pci_dev_put(intel_private.bridge_dev);
1459 intel_private.driver = NULL;
1460}
1461EXPORT_SYMBOL(intel_gmch_remove);
1462
1463MODULE_AUTHOR("Dave Jones, Various @Intel");
1464MODULE_LICENSE("GPL and additional rights");
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
42struct 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
62static 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 resource_size_t 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)
98static 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
119err:
120 sg_free_table(st);
121 return -ENOMEM;
122}
123
124static 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
138static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
139{
140 return;
141}
142
143/* Exists to support ARGB cursors */
144static 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
161static 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
173static 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
205static 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)
212static 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 */
239static 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
276static 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
294static 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 __free_page(page);
309 return -EINVAL;
310 }
311
312 intel_private.scratch_page_dma = dma_addr;
313 } else
314 intel_private.scratch_page_dma = page_to_phys(page);
315
316 intel_private.scratch_page = page;
317
318 return 0;
319}
320
321static void i810_write_entry(dma_addr_t addr, unsigned int entry,
322 unsigned int flags)
323{
324 u32 pte_flags = I810_PTE_VALID;
325
326 switch (flags) {
327 case AGP_DCACHE_MEMORY:
328 pte_flags |= I810_PTE_LOCAL;
329 break;
330 case AGP_USER_CACHED_MEMORY:
331 pte_flags |= I830_PTE_SYSTEM_CACHED;
332 break;
333 }
334
335 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
336}
337
338static resource_size_t intel_gtt_stolen_size(void)
339{
340 u16 gmch_ctrl;
341 u8 rdct;
342 int local = 0;
343 static const int ddt[4] = { 0, 16, 32, 64 };
344 resource_size_t stolen_size = 0;
345
346 if (INTEL_GTT_GEN == 1)
347 return 0; /* no stolen mem on i81x */
348
349 pci_read_config_word(intel_private.bridge_dev,
350 I830_GMCH_CTRL, &gmch_ctrl);
351
352 if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
353 intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
354 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
355 case I830_GMCH_GMS_STOLEN_512:
356 stolen_size = KB(512);
357 break;
358 case I830_GMCH_GMS_STOLEN_1024:
359 stolen_size = MB(1);
360 break;
361 case I830_GMCH_GMS_STOLEN_8192:
362 stolen_size = MB(8);
363 break;
364 case I830_GMCH_GMS_LOCAL:
365 rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
366 stolen_size = (I830_RDRAM_ND(rdct) + 1) *
367 MB(ddt[I830_RDRAM_DDT(rdct)]);
368 local = 1;
369 break;
370 default:
371 stolen_size = 0;
372 break;
373 }
374 } else {
375 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
376 case I855_GMCH_GMS_STOLEN_1M:
377 stolen_size = MB(1);
378 break;
379 case I855_GMCH_GMS_STOLEN_4M:
380 stolen_size = MB(4);
381 break;
382 case I855_GMCH_GMS_STOLEN_8M:
383 stolen_size = MB(8);
384 break;
385 case I855_GMCH_GMS_STOLEN_16M:
386 stolen_size = MB(16);
387 break;
388 case I855_GMCH_GMS_STOLEN_32M:
389 stolen_size = MB(32);
390 break;
391 case I915_GMCH_GMS_STOLEN_48M:
392 stolen_size = MB(48);
393 break;
394 case I915_GMCH_GMS_STOLEN_64M:
395 stolen_size = MB(64);
396 break;
397 case G33_GMCH_GMS_STOLEN_128M:
398 stolen_size = MB(128);
399 break;
400 case G33_GMCH_GMS_STOLEN_256M:
401 stolen_size = MB(256);
402 break;
403 case INTEL_GMCH_GMS_STOLEN_96M:
404 stolen_size = MB(96);
405 break;
406 case INTEL_GMCH_GMS_STOLEN_160M:
407 stolen_size = MB(160);
408 break;
409 case INTEL_GMCH_GMS_STOLEN_224M:
410 stolen_size = MB(224);
411 break;
412 case INTEL_GMCH_GMS_STOLEN_352M:
413 stolen_size = MB(352);
414 break;
415 default:
416 stolen_size = 0;
417 break;
418 }
419 }
420
421 if (stolen_size > 0) {
422 dev_info(&intel_private.bridge_dev->dev, "detected %lluK %s memory\n",
423 (u64)stolen_size / KB(1), local ? "local" : "stolen");
424 } else {
425 dev_info(&intel_private.bridge_dev->dev,
426 "no pre-allocated video memory detected\n");
427 stolen_size = 0;
428 }
429
430 return stolen_size;
431}
432
433static void i965_adjust_pgetbl_size(unsigned int size_flag)
434{
435 u32 pgetbl_ctl, pgetbl_ctl2;
436
437 /* ensure that ppgtt is disabled */
438 pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
439 pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
440 writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
441
442 /* write the new ggtt size */
443 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
444 pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
445 pgetbl_ctl |= size_flag;
446 writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
447}
448
449static unsigned int i965_gtt_total_entries(void)
450{
451 int size;
452 u32 pgetbl_ctl;
453 u16 gmch_ctl;
454
455 pci_read_config_word(intel_private.bridge_dev,
456 I830_GMCH_CTRL, &gmch_ctl);
457
458 if (INTEL_GTT_GEN == 5) {
459 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
460 case G4x_GMCH_SIZE_1M:
461 case G4x_GMCH_SIZE_VT_1M:
462 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
463 break;
464 case G4x_GMCH_SIZE_VT_1_5M:
465 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
466 break;
467 case G4x_GMCH_SIZE_2M:
468 case G4x_GMCH_SIZE_VT_2M:
469 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
470 break;
471 }
472 }
473
474 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
475
476 switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
477 case I965_PGETBL_SIZE_128KB:
478 size = KB(128);
479 break;
480 case I965_PGETBL_SIZE_256KB:
481 size = KB(256);
482 break;
483 case I965_PGETBL_SIZE_512KB:
484 size = KB(512);
485 break;
486 /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
487 case I965_PGETBL_SIZE_1MB:
488 size = KB(1024);
489 break;
490 case I965_PGETBL_SIZE_2MB:
491 size = KB(2048);
492 break;
493 case I965_PGETBL_SIZE_1_5MB:
494 size = KB(1024 + 512);
495 break;
496 default:
497 dev_info(&intel_private.pcidev->dev,
498 "unknown page table size, assuming 512KB\n");
499 size = KB(512);
500 }
501
502 return size/4;
503}
504
505static unsigned int intel_gtt_total_entries(void)
506{
507 if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
508 return i965_gtt_total_entries();
509 else {
510 /* On previous hardware, the GTT size was just what was
511 * required to map the aperture.
512 */
513 return intel_private.gtt_mappable_entries;
514 }
515}
516
517static unsigned int intel_gtt_mappable_entries(void)
518{
519 unsigned int aperture_size;
520
521 if (INTEL_GTT_GEN == 1) {
522 u32 smram_miscc;
523
524 pci_read_config_dword(intel_private.bridge_dev,
525 I810_SMRAM_MISCC, &smram_miscc);
526
527 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
528 == I810_GFX_MEM_WIN_32M)
529 aperture_size = MB(32);
530 else
531 aperture_size = MB(64);
532 } else if (INTEL_GTT_GEN == 2) {
533 u16 gmch_ctrl;
534
535 pci_read_config_word(intel_private.bridge_dev,
536 I830_GMCH_CTRL, &gmch_ctrl);
537
538 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
539 aperture_size = MB(64);
540 else
541 aperture_size = MB(128);
542 } else {
543 /* 9xx supports large sizes, just look at the length */
544 aperture_size = pci_resource_len(intel_private.pcidev, 2);
545 }
546
547 return aperture_size >> PAGE_SHIFT;
548}
549
550static void intel_gtt_teardown_scratch_page(void)
551{
552 set_pages_wb(intel_private.scratch_page, 1);
553 if (intel_private.needs_dmar)
554 pci_unmap_page(intel_private.pcidev,
555 intel_private.scratch_page_dma,
556 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
557 __free_page(intel_private.scratch_page);
558}
559
560static void intel_gtt_cleanup(void)
561{
562 intel_private.driver->cleanup();
563
564 iounmap(intel_private.gtt);
565 iounmap(intel_private.registers);
566
567 intel_gtt_teardown_scratch_page();
568}
569
570/* Certain Gen5 chipsets require require idling the GPU before
571 * unmapping anything from the GTT when VT-d is enabled.
572 */
573static inline int needs_ilk_vtd_wa(void)
574{
575#ifdef CONFIG_INTEL_IOMMU
576 const unsigned short gpu_devid = intel_private.pcidev->device;
577
578 /* Query intel_iommu to see if we need the workaround. Presumably that
579 * was loaded first.
580 */
581 if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
582 gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
583 intel_iommu_gfx_mapped)
584 return 1;
585#endif
586 return 0;
587}
588
589static bool intel_gtt_can_wc(void)
590{
591 if (INTEL_GTT_GEN <= 2)
592 return false;
593
594 if (INTEL_GTT_GEN >= 6)
595 return false;
596
597 /* Reports of major corruption with ILK vt'd enabled */
598 if (needs_ilk_vtd_wa())
599 return false;
600
601 return true;
602}
603
604static int intel_gtt_init(void)
605{
606 u32 gtt_map_size;
607 int ret, bar;
608
609 ret = intel_private.driver->setup();
610 if (ret != 0)
611 return ret;
612
613 intel_private.gtt_mappable_entries = intel_gtt_mappable_entries();
614 intel_private.gtt_total_entries = intel_gtt_total_entries();
615
616 /* save the PGETBL reg for resume */
617 intel_private.PGETBL_save =
618 readl(intel_private.registers+I810_PGETBL_CTL)
619 & ~I810_PGETBL_ENABLED;
620 /* we only ever restore the register when enabling the PGTBL... */
621 if (HAS_PGTBL_EN)
622 intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
623
624 dev_info(&intel_private.bridge_dev->dev,
625 "detected gtt size: %dK total, %dK mappable\n",
626 intel_private.gtt_total_entries * 4,
627 intel_private.gtt_mappable_entries * 4);
628
629 gtt_map_size = intel_private.gtt_total_entries * 4;
630
631 intel_private.gtt = NULL;
632 if (intel_gtt_can_wc())
633 intel_private.gtt = ioremap_wc(intel_private.gtt_phys_addr,
634 gtt_map_size);
635 if (intel_private.gtt == NULL)
636 intel_private.gtt = ioremap(intel_private.gtt_phys_addr,
637 gtt_map_size);
638 if (intel_private.gtt == NULL) {
639 intel_private.driver->cleanup();
640 iounmap(intel_private.registers);
641 return -ENOMEM;
642 }
643
644#if IS_ENABLED(CONFIG_AGP_INTEL)
645 global_cache_flush(); /* FIXME: ? */
646#endif
647
648 intel_private.stolen_size = intel_gtt_stolen_size();
649
650 intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
651
652 ret = intel_gtt_setup_scratch_page();
653 if (ret != 0) {
654 intel_gtt_cleanup();
655 return ret;
656 }
657
658 if (INTEL_GTT_GEN <= 2)
659 bar = I810_GMADR_BAR;
660 else
661 bar = I915_GMADR_BAR;
662
663 intel_private.gma_bus_addr = pci_bus_address(intel_private.pcidev, bar);
664 return 0;
665}
666
667#if IS_ENABLED(CONFIG_AGP_INTEL)
668static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
669 {32, 8192, 3},
670 {64, 16384, 4},
671 {128, 32768, 5},
672 {256, 65536, 6},
673 {512, 131072, 7},
674};
675
676static int intel_fake_agp_fetch_size(void)
677{
678 int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
679 unsigned int aper_size;
680 int i;
681
682 aper_size = (intel_private.gtt_mappable_entries << PAGE_SHIFT) / MB(1);
683
684 for (i = 0; i < num_sizes; i++) {
685 if (aper_size == intel_fake_agp_sizes[i].size) {
686 agp_bridge->current_size =
687 (void *) (intel_fake_agp_sizes + i);
688 return aper_size;
689 }
690 }
691
692 return 0;
693}
694#endif
695
696static void i830_cleanup(void)
697{
698}
699
700/* The chipset_flush interface needs to get data that has already been
701 * flushed out of the CPU all the way out to main memory, because the GPU
702 * doesn't snoop those buffers.
703 *
704 * The 8xx series doesn't have the same lovely interface for flushing the
705 * chipset write buffers that the later chips do. According to the 865
706 * specs, it's 64 octwords, or 1KB. So, to get those previous things in
707 * that buffer out, we just fill 1KB and clflush it out, on the assumption
708 * that it'll push whatever was in there out. It appears to work.
709 */
710static void i830_chipset_flush(void)
711{
712 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
713
714 /* Forcibly evict everything from the CPU write buffers.
715 * clflush appears to be insufficient.
716 */
717 wbinvd_on_all_cpus();
718
719 /* Now we've only seen documents for this magic bit on 855GM,
720 * we hope it exists for the other gen2 chipsets...
721 *
722 * Also works as advertised on my 845G.
723 */
724 writel(readl(intel_private.registers+I830_HIC) | (1<<31),
725 intel_private.registers+I830_HIC);
726
727 while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
728 if (time_after(jiffies, timeout))
729 break;
730
731 udelay(50);
732 }
733}
734
735static void i830_write_entry(dma_addr_t addr, unsigned int entry,
736 unsigned int flags)
737{
738 u32 pte_flags = I810_PTE_VALID;
739
740 if (flags == AGP_USER_CACHED_MEMORY)
741 pte_flags |= I830_PTE_SYSTEM_CACHED;
742
743 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
744}
745
746bool intel_enable_gtt(void)
747{
748 u8 __iomem *reg;
749
750 if (INTEL_GTT_GEN == 2) {
751 u16 gmch_ctrl;
752
753 pci_read_config_word(intel_private.bridge_dev,
754 I830_GMCH_CTRL, &gmch_ctrl);
755 gmch_ctrl |= I830_GMCH_ENABLED;
756 pci_write_config_word(intel_private.bridge_dev,
757 I830_GMCH_CTRL, gmch_ctrl);
758
759 pci_read_config_word(intel_private.bridge_dev,
760 I830_GMCH_CTRL, &gmch_ctrl);
761 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
762 dev_err(&intel_private.pcidev->dev,
763 "failed to enable the GTT: GMCH_CTRL=%x\n",
764 gmch_ctrl);
765 return false;
766 }
767 }
768
769 /* On the resume path we may be adjusting the PGTBL value, so
770 * be paranoid and flush all chipset write buffers...
771 */
772 if (INTEL_GTT_GEN >= 3)
773 writel(0, intel_private.registers+GFX_FLSH_CNTL);
774
775 reg = intel_private.registers+I810_PGETBL_CTL;
776 writel(intel_private.PGETBL_save, reg);
777 if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
778 dev_err(&intel_private.pcidev->dev,
779 "failed to enable the GTT: PGETBL=%x [expected %x]\n",
780 readl(reg), intel_private.PGETBL_save);
781 return false;
782 }
783
784 if (INTEL_GTT_GEN >= 3)
785 writel(0, intel_private.registers+GFX_FLSH_CNTL);
786
787 return true;
788}
789EXPORT_SYMBOL(intel_enable_gtt);
790
791static int i830_setup(void)
792{
793 phys_addr_t reg_addr;
794
795 reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
796
797 intel_private.registers = ioremap(reg_addr, KB(64));
798 if (!intel_private.registers)
799 return -ENOMEM;
800
801 intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
802
803 return 0;
804}
805
806#if IS_ENABLED(CONFIG_AGP_INTEL)
807static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
808{
809 agp_bridge->gatt_table_real = NULL;
810 agp_bridge->gatt_table = NULL;
811 agp_bridge->gatt_bus_addr = 0;
812
813 return 0;
814}
815
816static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
817{
818 return 0;
819}
820
821static int intel_fake_agp_configure(void)
822{
823 if (!intel_enable_gtt())
824 return -EIO;
825
826 intel_private.clear_fake_agp = true;
827 agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
828
829 return 0;
830}
831#endif
832
833static bool i830_check_flags(unsigned int flags)
834{
835 switch (flags) {
836 case 0:
837 case AGP_PHYS_MEMORY:
838 case AGP_USER_CACHED_MEMORY:
839 case AGP_USER_MEMORY:
840 return true;
841 }
842
843 return false;
844}
845
846void intel_gtt_insert_page(dma_addr_t addr,
847 unsigned int pg,
848 unsigned int flags)
849{
850 intel_private.driver->write_entry(addr, pg, flags);
851 readl(intel_private.gtt + pg);
852 if (intel_private.driver->chipset_flush)
853 intel_private.driver->chipset_flush();
854}
855EXPORT_SYMBOL(intel_gtt_insert_page);
856
857void intel_gtt_insert_sg_entries(struct sg_table *st,
858 unsigned int pg_start,
859 unsigned int flags)
860{
861 struct scatterlist *sg;
862 unsigned int len, m;
863 int i, j;
864
865 j = pg_start;
866
867 /* sg may merge pages, but we have to separate
868 * per-page addr for GTT */
869 for_each_sg(st->sgl, sg, st->nents, i) {
870 len = sg_dma_len(sg) >> PAGE_SHIFT;
871 for (m = 0; m < len; m++) {
872 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
873 intel_private.driver->write_entry(addr, j, flags);
874 j++;
875 }
876 }
877 readl(intel_private.gtt + j - 1);
878 if (intel_private.driver->chipset_flush)
879 intel_private.driver->chipset_flush();
880}
881EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
882
883#if IS_ENABLED(CONFIG_AGP_INTEL)
884static void intel_gtt_insert_pages(unsigned int first_entry,
885 unsigned int num_entries,
886 struct page **pages,
887 unsigned int flags)
888{
889 int i, j;
890
891 for (i = 0, j = first_entry; i < num_entries; i++, j++) {
892 dma_addr_t addr = page_to_phys(pages[i]);
893 intel_private.driver->write_entry(addr,
894 j, flags);
895 }
896 wmb();
897}
898
899static int intel_fake_agp_insert_entries(struct agp_memory *mem,
900 off_t pg_start, int type)
901{
902 int ret = -EINVAL;
903
904 if (intel_private.clear_fake_agp) {
905 int start = intel_private.stolen_size / PAGE_SIZE;
906 int end = intel_private.gtt_mappable_entries;
907 intel_gtt_clear_range(start, end - start);
908 intel_private.clear_fake_agp = false;
909 }
910
911 if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
912 return i810_insert_dcache_entries(mem, pg_start, type);
913
914 if (mem->page_count == 0)
915 goto out;
916
917 if (pg_start + mem->page_count > intel_private.gtt_total_entries)
918 goto out_err;
919
920 if (type != mem->type)
921 goto out_err;
922
923 if (!intel_private.driver->check_flags(type))
924 goto out_err;
925
926 if (!mem->is_flushed)
927 global_cache_flush();
928
929 if (intel_private.needs_dmar) {
930 struct sg_table st;
931
932 ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st);
933 if (ret != 0)
934 return ret;
935
936 intel_gtt_insert_sg_entries(&st, pg_start, type);
937 mem->sg_list = st.sgl;
938 mem->num_sg = st.nents;
939 } else
940 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
941 type);
942
943out:
944 ret = 0;
945out_err:
946 mem->is_flushed = true;
947 return ret;
948}
949#endif
950
951void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
952{
953 unsigned int i;
954
955 for (i = first_entry; i < (first_entry + num_entries); i++) {
956 intel_private.driver->write_entry(intel_private.scratch_page_dma,
957 i, 0);
958 }
959 wmb();
960}
961EXPORT_SYMBOL(intel_gtt_clear_range);
962
963#if IS_ENABLED(CONFIG_AGP_INTEL)
964static int intel_fake_agp_remove_entries(struct agp_memory *mem,
965 off_t pg_start, int type)
966{
967 if (mem->page_count == 0)
968 return 0;
969
970 intel_gtt_clear_range(pg_start, mem->page_count);
971
972 if (intel_private.needs_dmar) {
973 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
974 mem->sg_list = NULL;
975 mem->num_sg = 0;
976 }
977
978 return 0;
979}
980
981static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
982 int type)
983{
984 struct agp_memory *new;
985
986 if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
987 if (pg_count != intel_private.num_dcache_entries)
988 return NULL;
989
990 new = agp_create_memory(1);
991 if (new == NULL)
992 return NULL;
993
994 new->type = AGP_DCACHE_MEMORY;
995 new->page_count = pg_count;
996 new->num_scratch_pages = 0;
997 agp_free_page_array(new);
998 return new;
999 }
1000 if (type == AGP_PHYS_MEMORY)
1001 return alloc_agpphysmem_i8xx(pg_count, type);
1002 /* always return NULL for other allocation types for now */
1003 return NULL;
1004}
1005#endif
1006
1007static int intel_alloc_chipset_flush_resource(void)
1008{
1009 int ret;
1010 ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1011 PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1012 pcibios_align_resource, intel_private.bridge_dev);
1013
1014 return ret;
1015}
1016
1017static void intel_i915_setup_chipset_flush(void)
1018{
1019 int ret;
1020 u32 temp;
1021
1022 pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1023 if (!(temp & 0x1)) {
1024 intel_alloc_chipset_flush_resource();
1025 intel_private.resource_valid = 1;
1026 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1027 } else {
1028 temp &= ~1;
1029
1030 intel_private.resource_valid = 1;
1031 intel_private.ifp_resource.start = temp;
1032 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1033 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1034 /* some BIOSes reserve this area in a pnp some don't */
1035 if (ret)
1036 intel_private.resource_valid = 0;
1037 }
1038}
1039
1040static void intel_i965_g33_setup_chipset_flush(void)
1041{
1042 u32 temp_hi, temp_lo;
1043 int ret;
1044
1045 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1046 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1047
1048 if (!(temp_lo & 0x1)) {
1049
1050 intel_alloc_chipset_flush_resource();
1051
1052 intel_private.resource_valid = 1;
1053 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1054 upper_32_bits(intel_private.ifp_resource.start));
1055 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1056 } else {
1057 u64 l64;
1058
1059 temp_lo &= ~0x1;
1060 l64 = ((u64)temp_hi << 32) | temp_lo;
1061
1062 intel_private.resource_valid = 1;
1063 intel_private.ifp_resource.start = l64;
1064 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1065 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1066 /* some BIOSes reserve this area in a pnp some don't */
1067 if (ret)
1068 intel_private.resource_valid = 0;
1069 }
1070}
1071
1072static void intel_i9xx_setup_flush(void)
1073{
1074 /* return if already configured */
1075 if (intel_private.ifp_resource.start)
1076 return;
1077
1078 if (INTEL_GTT_GEN == 6)
1079 return;
1080
1081 /* setup a resource for this object */
1082 intel_private.ifp_resource.name = "Intel Flush Page";
1083 intel_private.ifp_resource.flags = IORESOURCE_MEM;
1084
1085 /* Setup chipset flush for 915 */
1086 if (IS_G33 || INTEL_GTT_GEN >= 4) {
1087 intel_i965_g33_setup_chipset_flush();
1088 } else {
1089 intel_i915_setup_chipset_flush();
1090 }
1091
1092 if (intel_private.ifp_resource.start)
1093 intel_private.i9xx_flush_page = ioremap(intel_private.ifp_resource.start, PAGE_SIZE);
1094 if (!intel_private.i9xx_flush_page)
1095 dev_err(&intel_private.pcidev->dev,
1096 "can't ioremap flush page - no chipset flushing\n");
1097}
1098
1099static void i9xx_cleanup(void)
1100{
1101 if (intel_private.i9xx_flush_page)
1102 iounmap(intel_private.i9xx_flush_page);
1103 if (intel_private.resource_valid)
1104 release_resource(&intel_private.ifp_resource);
1105 intel_private.ifp_resource.start = 0;
1106 intel_private.resource_valid = 0;
1107}
1108
1109static void i9xx_chipset_flush(void)
1110{
1111 wmb();
1112 if (intel_private.i9xx_flush_page)
1113 writel(1, intel_private.i9xx_flush_page);
1114}
1115
1116static void i965_write_entry(dma_addr_t addr,
1117 unsigned int entry,
1118 unsigned int flags)
1119{
1120 u32 pte_flags;
1121
1122 pte_flags = I810_PTE_VALID;
1123 if (flags == AGP_USER_CACHED_MEMORY)
1124 pte_flags |= I830_PTE_SYSTEM_CACHED;
1125
1126 /* Shift high bits down */
1127 addr |= (addr >> 28) & 0xf0;
1128 writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
1129}
1130
1131static int i9xx_setup(void)
1132{
1133 phys_addr_t reg_addr;
1134 int size = KB(512);
1135
1136 reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR);
1137
1138 intel_private.registers = ioremap(reg_addr, size);
1139 if (!intel_private.registers)
1140 return -ENOMEM;
1141
1142 switch (INTEL_GTT_GEN) {
1143 case 3:
1144 intel_private.gtt_phys_addr =
1145 pci_resource_start(intel_private.pcidev, I915_PTE_BAR);
1146 break;
1147 case 5:
1148 intel_private.gtt_phys_addr = reg_addr + MB(2);
1149 break;
1150 default:
1151 intel_private.gtt_phys_addr = reg_addr + KB(512);
1152 break;
1153 }
1154
1155 intel_i9xx_setup_flush();
1156
1157 return 0;
1158}
1159
1160#if IS_ENABLED(CONFIG_AGP_INTEL)
1161static const struct agp_bridge_driver intel_fake_agp_driver = {
1162 .owner = THIS_MODULE,
1163 .size_type = FIXED_APER_SIZE,
1164 .aperture_sizes = intel_fake_agp_sizes,
1165 .num_aperture_sizes = ARRAY_SIZE(intel_fake_agp_sizes),
1166 .configure = intel_fake_agp_configure,
1167 .fetch_size = intel_fake_agp_fetch_size,
1168 .cleanup = intel_gtt_cleanup,
1169 .agp_enable = intel_fake_agp_enable,
1170 .cache_flush = global_cache_flush,
1171 .create_gatt_table = intel_fake_agp_create_gatt_table,
1172 .free_gatt_table = intel_fake_agp_free_gatt_table,
1173 .insert_memory = intel_fake_agp_insert_entries,
1174 .remove_memory = intel_fake_agp_remove_entries,
1175 .alloc_by_type = intel_fake_agp_alloc_by_type,
1176 .free_by_type = intel_i810_free_by_type,
1177 .agp_alloc_page = agp_generic_alloc_page,
1178 .agp_alloc_pages = agp_generic_alloc_pages,
1179 .agp_destroy_page = agp_generic_destroy_page,
1180 .agp_destroy_pages = agp_generic_destroy_pages,
1181};
1182#endif
1183
1184static const struct intel_gtt_driver i81x_gtt_driver = {
1185 .gen = 1,
1186 .has_pgtbl_enable = 1,
1187 .dma_mask_size = 32,
1188 .setup = i810_setup,
1189 .cleanup = i810_cleanup,
1190 .check_flags = i830_check_flags,
1191 .write_entry = i810_write_entry,
1192};
1193static const struct intel_gtt_driver i8xx_gtt_driver = {
1194 .gen = 2,
1195 .has_pgtbl_enable = 1,
1196 .setup = i830_setup,
1197 .cleanup = i830_cleanup,
1198 .write_entry = i830_write_entry,
1199 .dma_mask_size = 32,
1200 .check_flags = i830_check_flags,
1201 .chipset_flush = i830_chipset_flush,
1202};
1203static const struct intel_gtt_driver i915_gtt_driver = {
1204 .gen = 3,
1205 .has_pgtbl_enable = 1,
1206 .setup = i9xx_setup,
1207 .cleanup = i9xx_cleanup,
1208 /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1209 .write_entry = i830_write_entry,
1210 .dma_mask_size = 32,
1211 .check_flags = i830_check_flags,
1212 .chipset_flush = i9xx_chipset_flush,
1213};
1214static const struct intel_gtt_driver g33_gtt_driver = {
1215 .gen = 3,
1216 .is_g33 = 1,
1217 .setup = i9xx_setup,
1218 .cleanup = i9xx_cleanup,
1219 .write_entry = i965_write_entry,
1220 .dma_mask_size = 36,
1221 .check_flags = i830_check_flags,
1222 .chipset_flush = i9xx_chipset_flush,
1223};
1224static const struct intel_gtt_driver pineview_gtt_driver = {
1225 .gen = 3,
1226 .is_pineview = 1, .is_g33 = 1,
1227 .setup = i9xx_setup,
1228 .cleanup = i9xx_cleanup,
1229 .write_entry = i965_write_entry,
1230 .dma_mask_size = 36,
1231 .check_flags = i830_check_flags,
1232 .chipset_flush = i9xx_chipset_flush,
1233};
1234static const struct intel_gtt_driver i965_gtt_driver = {
1235 .gen = 4,
1236 .has_pgtbl_enable = 1,
1237 .setup = i9xx_setup,
1238 .cleanup = i9xx_cleanup,
1239 .write_entry = i965_write_entry,
1240 .dma_mask_size = 36,
1241 .check_flags = i830_check_flags,
1242 .chipset_flush = i9xx_chipset_flush,
1243};
1244static const struct intel_gtt_driver g4x_gtt_driver = {
1245 .gen = 5,
1246 .setup = i9xx_setup,
1247 .cleanup = i9xx_cleanup,
1248 .write_entry = i965_write_entry,
1249 .dma_mask_size = 36,
1250 .check_flags = i830_check_flags,
1251 .chipset_flush = i9xx_chipset_flush,
1252};
1253static const struct intel_gtt_driver ironlake_gtt_driver = {
1254 .gen = 5,
1255 .is_ironlake = 1,
1256 .setup = i9xx_setup,
1257 .cleanup = i9xx_cleanup,
1258 .write_entry = i965_write_entry,
1259 .dma_mask_size = 36,
1260 .check_flags = i830_check_flags,
1261 .chipset_flush = i9xx_chipset_flush,
1262};
1263
1264/* Table to describe Intel GMCH and AGP/PCIE GART drivers. At least one of
1265 * driver and gmch_driver must be non-null, and find_gmch will determine
1266 * which one should be used if a gmch_chip_id is present.
1267 */
1268static const struct intel_gtt_driver_description {
1269 unsigned int gmch_chip_id;
1270 char *name;
1271 const struct intel_gtt_driver *gtt_driver;
1272} intel_gtt_chipsets[] = {
1273 { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1274 &i81x_gtt_driver},
1275 { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1276 &i81x_gtt_driver},
1277 { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1278 &i81x_gtt_driver},
1279 { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1280 &i81x_gtt_driver},
1281 { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1282 &i8xx_gtt_driver},
1283 { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1284 &i8xx_gtt_driver},
1285 { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1286 &i8xx_gtt_driver},
1287 { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1288 &i8xx_gtt_driver},
1289 { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1290 &i8xx_gtt_driver},
1291 { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1292 &i915_gtt_driver },
1293 { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1294 &i915_gtt_driver },
1295 { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1296 &i915_gtt_driver },
1297 { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1298 &i915_gtt_driver },
1299 { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1300 &i915_gtt_driver },
1301 { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1302 &i915_gtt_driver },
1303 { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1304 &i965_gtt_driver },
1305 { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1306 &i965_gtt_driver },
1307 { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1308 &i965_gtt_driver },
1309 { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1310 &i965_gtt_driver },
1311 { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1312 &i965_gtt_driver },
1313 { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1314 &i965_gtt_driver },
1315 { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1316 &g33_gtt_driver },
1317 { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1318 &g33_gtt_driver },
1319 { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1320 &g33_gtt_driver },
1321 { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1322 &pineview_gtt_driver },
1323 { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1324 &pineview_gtt_driver },
1325 { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1326 &g4x_gtt_driver },
1327 { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1328 &g4x_gtt_driver },
1329 { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1330 &g4x_gtt_driver },
1331 { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1332 &g4x_gtt_driver },
1333 { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1334 &g4x_gtt_driver },
1335 { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1336 &g4x_gtt_driver },
1337 { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1338 &g4x_gtt_driver },
1339 { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1340 "HD Graphics", &ironlake_gtt_driver },
1341 { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1342 "HD Graphics", &ironlake_gtt_driver },
1343 { 0, NULL, NULL }
1344};
1345
1346static int find_gmch(u16 device)
1347{
1348 struct pci_dev *gmch_device;
1349
1350 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1351 if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1352 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1353 device, gmch_device);
1354 }
1355
1356 if (!gmch_device)
1357 return 0;
1358
1359 intel_private.pcidev = gmch_device;
1360 return 1;
1361}
1362
1363int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
1364 struct agp_bridge_data *bridge)
1365{
1366 int i, mask;
1367
1368 for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1369 if (gpu_pdev) {
1370 if (gpu_pdev->device ==
1371 intel_gtt_chipsets[i].gmch_chip_id) {
1372 intel_private.pcidev = pci_dev_get(gpu_pdev);
1373 intel_private.driver =
1374 intel_gtt_chipsets[i].gtt_driver;
1375
1376 break;
1377 }
1378 } else if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1379 intel_private.driver =
1380 intel_gtt_chipsets[i].gtt_driver;
1381 break;
1382 }
1383 }
1384
1385 if (!intel_private.driver)
1386 return 0;
1387
1388#if IS_ENABLED(CONFIG_AGP_INTEL)
1389 if (bridge) {
1390 if (INTEL_GTT_GEN > 1)
1391 return 0;
1392
1393 bridge->driver = &intel_fake_agp_driver;
1394 bridge->dev_private_data = &intel_private;
1395 bridge->dev = bridge_pdev;
1396 }
1397#endif
1398
1399
1400 /*
1401 * Can be called from the fake agp driver but also directly from
1402 * drm/i915.ko. Hence we need to check whether everything is set up
1403 * already.
1404 */
1405 if (intel_private.refcount++)
1406 return 1;
1407
1408 intel_private.bridge_dev = pci_dev_get(bridge_pdev);
1409
1410 dev_info(&bridge_pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1411
1412 if (bridge) {
1413 mask = intel_private.driver->dma_mask_size;
1414 if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
1415 dev_err(&intel_private.pcidev->dev,
1416 "set gfx device dma mask %d-bit failed!\n",
1417 mask);
1418 else
1419 pci_set_consistent_dma_mask(intel_private.pcidev,
1420 DMA_BIT_MASK(mask));
1421 }
1422
1423 if (intel_gtt_init() != 0) {
1424 intel_gmch_remove();
1425
1426 return 0;
1427 }
1428
1429 return 1;
1430}
1431EXPORT_SYMBOL(intel_gmch_probe);
1432
1433void intel_gtt_get(u64 *gtt_total,
1434 phys_addr_t *mappable_base,
1435 resource_size_t *mappable_end)
1436{
1437 *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
1438 *mappable_base = intel_private.gma_bus_addr;
1439 *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT;
1440}
1441EXPORT_SYMBOL(intel_gtt_get);
1442
1443void intel_gtt_chipset_flush(void)
1444{
1445 if (intel_private.driver->chipset_flush)
1446 intel_private.driver->chipset_flush();
1447}
1448EXPORT_SYMBOL(intel_gtt_chipset_flush);
1449
1450void intel_gmch_remove(void)
1451{
1452 if (--intel_private.refcount)
1453 return;
1454
1455 if (intel_private.scratch_page)
1456 intel_gtt_teardown_scratch_page();
1457 if (intel_private.pcidev)
1458 pci_dev_put(intel_private.pcidev);
1459 if (intel_private.bridge_dev)
1460 pci_dev_put(intel_private.bridge_dev);
1461 intel_private.driver = NULL;
1462}
1463EXPORT_SYMBOL(intel_gmch_remove);
1464
1465MODULE_AUTHOR("Dave Jones, Various @Intel");
1466MODULE_LICENSE("GPL and additional rights");