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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2012-2015 VMware, Inc., Palo Alto, CA., USA
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include <linux/highmem.h>
29
30#include "vmwgfx_drv.h"
31
32/*
33 * If we set up the screen target otable, screen objects stop working.
34 */
35
36#define VMW_OTABLE_SETUP_SUB ((VMWGFX_ENABLE_SCREEN_TARGET_OTABLE ? 0 : 1))
37
38#ifdef CONFIG_64BIT
39#define VMW_PPN_SIZE 8
40#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH64_0
41#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH64_1
42#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH64_2
43#else
44#define VMW_PPN_SIZE 4
45#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH_0
46#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH_1
47#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH_2
48#endif
49
50/*
51 * struct vmw_mob - Structure containing page table and metadata for a
52 * Guest Memory OBject.
53 *
54 * @num_pages Number of pages that make up the page table.
55 * @pt_level The indirection level of the page table. 0-2.
56 * @pt_root_page DMA address of the level 0 page of the page table.
57 */
58struct vmw_mob {
59 struct ttm_buffer_object *pt_bo;
60 unsigned long num_pages;
61 unsigned pt_level;
62 dma_addr_t pt_root_page;
63 uint32_t id;
64};
65
66/*
67 * struct vmw_otable - Guest Memory OBject table metadata
68 *
69 * @size: Size of the table (page-aligned).
70 * @page_table: Pointer to a struct vmw_mob holding the page table.
71 */
72static const struct vmw_otable pre_dx_tables[] = {
73 {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
74 {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
75 {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
76 {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
77 {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
78 NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE}
79};
80
81static const struct vmw_otable dx_tables[] = {
82 {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
83 {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
84 {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
85 {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
86 {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
87 NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE},
88 {VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true},
89};
90
91static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
92 struct vmw_mob *mob);
93static void vmw_mob_pt_setup(struct vmw_mob *mob,
94 struct vmw_piter data_iter,
95 unsigned long num_data_pages);
96
97/*
98 * vmw_setup_otable_base - Issue an object table base setup command to
99 * the device
100 *
101 * @dev_priv: Pointer to a device private structure
102 * @type: Type of object table base
103 * @offset Start of table offset into dev_priv::otable_bo
104 * @otable Pointer to otable metadata;
105 *
106 * This function returns -ENOMEM if it fails to reserve fifo space,
107 * and may block waiting for fifo space.
108 */
109static int vmw_setup_otable_base(struct vmw_private *dev_priv,
110 SVGAOTableType type,
111 struct ttm_buffer_object *otable_bo,
112 unsigned long offset,
113 struct vmw_otable *otable)
114{
115 struct {
116 SVGA3dCmdHeader header;
117 SVGA3dCmdSetOTableBase64 body;
118 } *cmd;
119 struct vmw_mob *mob;
120 const struct vmw_sg_table *vsgt;
121 struct vmw_piter iter;
122 int ret;
123
124 BUG_ON(otable->page_table != NULL);
125
126 vsgt = vmw_bo_sg_table(otable_bo);
127 vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
128 WARN_ON(!vmw_piter_next(&iter));
129
130 mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
131 if (unlikely(mob == NULL)) {
132 DRM_ERROR("Failed creating OTable page table.\n");
133 return -ENOMEM;
134 }
135
136 if (otable->size <= PAGE_SIZE) {
137 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
138 mob->pt_root_page = vmw_piter_dma_addr(&iter);
139 } else if (vsgt->num_regions == 1) {
140 mob->pt_level = SVGA3D_MOBFMT_RANGE;
141 mob->pt_root_page = vmw_piter_dma_addr(&iter);
142 } else {
143 ret = vmw_mob_pt_populate(dev_priv, mob);
144 if (unlikely(ret != 0))
145 goto out_no_populate;
146
147 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
148 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
149 }
150
151 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
152 if (unlikely(cmd == NULL)) {
153 ret = -ENOMEM;
154 goto out_no_fifo;
155 }
156
157 memset(cmd, 0, sizeof(*cmd));
158 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
159 cmd->header.size = sizeof(cmd->body);
160 cmd->body.type = type;
161 cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
162 cmd->body.sizeInBytes = otable->size;
163 cmd->body.validSizeInBytes = 0;
164 cmd->body.ptDepth = mob->pt_level;
165
166 /*
167 * The device doesn't support this, But the otable size is
168 * determined at compile-time, so this BUG shouldn't trigger
169 * randomly.
170 */
171 BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
172
173 vmw_fifo_commit(dev_priv, sizeof(*cmd));
174 otable->page_table = mob;
175
176 return 0;
177
178out_no_fifo:
179out_no_populate:
180 vmw_mob_destroy(mob);
181 return ret;
182}
183
184/*
185 * vmw_takedown_otable_base - Issue an object table base takedown command
186 * to the device
187 *
188 * @dev_priv: Pointer to a device private structure
189 * @type: Type of object table base
190 *
191 */
192static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
193 SVGAOTableType type,
194 struct vmw_otable *otable)
195{
196 struct {
197 SVGA3dCmdHeader header;
198 SVGA3dCmdSetOTableBase body;
199 } *cmd;
200 struct ttm_buffer_object *bo;
201
202 if (otable->page_table == NULL)
203 return;
204
205 bo = otable->page_table->pt_bo;
206 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
207 if (unlikely(cmd == NULL))
208 return;
209
210 memset(cmd, 0, sizeof(*cmd));
211 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
212 cmd->header.size = sizeof(cmd->body);
213 cmd->body.type = type;
214 cmd->body.baseAddress = 0;
215 cmd->body.sizeInBytes = 0;
216 cmd->body.validSizeInBytes = 0;
217 cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
218 vmw_fifo_commit(dev_priv, sizeof(*cmd));
219
220 if (bo) {
221 int ret;
222
223 ret = ttm_bo_reserve(bo, false, true, NULL);
224 BUG_ON(ret != 0);
225
226 vmw_bo_fence_single(bo, NULL);
227 ttm_bo_unreserve(bo);
228 }
229
230 vmw_mob_destroy(otable->page_table);
231 otable->page_table = NULL;
232}
233
234
235static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
236 struct vmw_otable_batch *batch)
237{
238 unsigned long offset;
239 unsigned long bo_size;
240 struct vmw_otable *otables = batch->otables;
241 struct ttm_operation_ctx ctx = {
242 .interruptible = false,
243 .no_wait_gpu = false
244 };
245 SVGAOTableType i;
246 int ret;
247
248 bo_size = 0;
249 for (i = 0; i < batch->num_otables; ++i) {
250 if (!otables[i].enabled)
251 continue;
252
253 otables[i].size =
254 (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
255 bo_size += otables[i].size;
256 }
257
258 ret = ttm_bo_create(&dev_priv->bdev, bo_size,
259 ttm_bo_type_device,
260 &vmw_sys_ne_placement,
261 0, false, &batch->otable_bo);
262
263 if (unlikely(ret != 0))
264 goto out_no_bo;
265
266 ret = ttm_bo_reserve(batch->otable_bo, false, true, NULL);
267 BUG_ON(ret != 0);
268 ret = vmw_bo_driver.ttm_tt_populate(batch->otable_bo->ttm, &ctx);
269 if (unlikely(ret != 0))
270 goto out_unreserve;
271 ret = vmw_bo_map_dma(batch->otable_bo);
272 if (unlikely(ret != 0))
273 goto out_unreserve;
274
275 ttm_bo_unreserve(batch->otable_bo);
276
277 offset = 0;
278 for (i = 0; i < batch->num_otables; ++i) {
279 if (!batch->otables[i].enabled)
280 continue;
281
282 ret = vmw_setup_otable_base(dev_priv, i, batch->otable_bo,
283 offset,
284 &otables[i]);
285 if (unlikely(ret != 0))
286 goto out_no_setup;
287 offset += otables[i].size;
288 }
289
290 return 0;
291
292out_unreserve:
293 ttm_bo_unreserve(batch->otable_bo);
294out_no_setup:
295 for (i = 0; i < batch->num_otables; ++i) {
296 if (batch->otables[i].enabled)
297 vmw_takedown_otable_base(dev_priv, i,
298 &batch->otables[i]);
299 }
300
301 ttm_bo_put(batch->otable_bo);
302 batch->otable_bo = NULL;
303out_no_bo:
304 return ret;
305}
306
307/*
308 * vmw_otables_setup - Set up guest backed memory object tables
309 *
310 * @dev_priv: Pointer to a device private structure
311 *
312 * Takes care of the device guest backed surface
313 * initialization, by setting up the guest backed memory object tables.
314 * Returns 0 on success and various error codes on failure. A successful return
315 * means the object tables can be taken down using the vmw_otables_takedown
316 * function.
317 */
318int vmw_otables_setup(struct vmw_private *dev_priv)
319{
320 struct vmw_otable **otables = &dev_priv->otable_batch.otables;
321 int ret;
322
323 if (dev_priv->has_dx) {
324 *otables = kmemdup(dx_tables, sizeof(dx_tables), GFP_KERNEL);
325 if (!(*otables))
326 return -ENOMEM;
327
328 dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables);
329 } else {
330 *otables = kmemdup(pre_dx_tables, sizeof(pre_dx_tables),
331 GFP_KERNEL);
332 if (!(*otables))
333 return -ENOMEM;
334
335 dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables);
336 }
337
338 ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch);
339 if (unlikely(ret != 0))
340 goto out_setup;
341
342 return 0;
343
344out_setup:
345 kfree(*otables);
346 return ret;
347}
348
349static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
350 struct vmw_otable_batch *batch)
351{
352 SVGAOTableType i;
353 struct ttm_buffer_object *bo = batch->otable_bo;
354 int ret;
355
356 for (i = 0; i < batch->num_otables; ++i)
357 if (batch->otables[i].enabled)
358 vmw_takedown_otable_base(dev_priv, i,
359 &batch->otables[i]);
360
361 ret = ttm_bo_reserve(bo, false, true, NULL);
362 BUG_ON(ret != 0);
363
364 vmw_bo_fence_single(bo, NULL);
365 ttm_bo_unreserve(bo);
366
367 ttm_bo_put(batch->otable_bo);
368 batch->otable_bo = NULL;
369}
370
371/*
372 * vmw_otables_takedown - Take down guest backed memory object tables
373 *
374 * @dev_priv: Pointer to a device private structure
375 *
376 * Take down the Guest Memory Object tables.
377 */
378void vmw_otables_takedown(struct vmw_private *dev_priv)
379{
380 vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch);
381 kfree(dev_priv->otable_batch.otables);
382}
383
384/*
385 * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
386 * needed for a guest backed memory object.
387 *
388 * @data_pages: Number of data pages in the memory object buffer.
389 */
390static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
391{
392 unsigned long data_size = data_pages * PAGE_SIZE;
393 unsigned long tot_size = 0;
394
395 while (likely(data_size > PAGE_SIZE)) {
396 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
397 data_size *= VMW_PPN_SIZE;
398 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
399 }
400
401 return tot_size >> PAGE_SHIFT;
402}
403
404/*
405 * vmw_mob_create - Create a mob, but don't populate it.
406 *
407 * @data_pages: Number of data pages of the underlying buffer object.
408 */
409struct vmw_mob *vmw_mob_create(unsigned long data_pages)
410{
411 struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
412
413 if (unlikely(!mob))
414 return NULL;
415
416 mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
417
418 return mob;
419}
420
421/*
422 * vmw_mob_pt_populate - Populate the mob pagetable
423 *
424 * @mob: Pointer to the mob the pagetable of which we want to
425 * populate.
426 *
427 * This function allocates memory to be used for the pagetable, and
428 * adjusts TTM memory accounting accordingly. Returns ENOMEM if
429 * memory resources aren't sufficient and may cause TTM buffer objects
430 * to be swapped out by using the TTM memory accounting function.
431 */
432static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
433 struct vmw_mob *mob)
434{
435 int ret;
436 struct ttm_operation_ctx ctx = {
437 .interruptible = false,
438 .no_wait_gpu = false
439 };
440
441 BUG_ON(mob->pt_bo != NULL);
442
443 ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE,
444 ttm_bo_type_device,
445 &vmw_sys_ne_placement,
446 0, false, &mob->pt_bo);
447 if (unlikely(ret != 0))
448 return ret;
449
450 ret = ttm_bo_reserve(mob->pt_bo, false, true, NULL);
451
452 BUG_ON(ret != 0);
453 ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm, &ctx);
454 if (unlikely(ret != 0))
455 goto out_unreserve;
456 ret = vmw_bo_map_dma(mob->pt_bo);
457 if (unlikely(ret != 0))
458 goto out_unreserve;
459
460 ttm_bo_unreserve(mob->pt_bo);
461
462 return 0;
463
464out_unreserve:
465 ttm_bo_unreserve(mob->pt_bo);
466 ttm_bo_put(mob->pt_bo);
467 mob->pt_bo = NULL;
468
469 return ret;
470}
471
472/**
473 * vmw_mob_assign_ppn - Assign a value to a page table entry
474 *
475 * @addr: Pointer to pointer to page table entry.
476 * @val: The page table entry
477 *
478 * Assigns a value to a page table entry pointed to by *@addr and increments
479 * *@addr according to the page table entry size.
480 */
481#if (VMW_PPN_SIZE == 8)
482static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
483{
484 *((u64 *) *addr) = val >> PAGE_SHIFT;
485 *addr += 2;
486}
487#else
488static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
489{
490 *(*addr)++ = val >> PAGE_SHIFT;
491}
492#endif
493
494/*
495 * vmw_mob_build_pt - Build a pagetable
496 *
497 * @data_addr: Array of DMA addresses to the underlying buffer
498 * object's data pages.
499 * @num_data_pages: Number of buffer object data pages.
500 * @pt_pages: Array of page pointers to the page table pages.
501 *
502 * Returns the number of page table pages actually used.
503 * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
504 */
505static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
506 unsigned long num_data_pages,
507 struct vmw_piter *pt_iter)
508{
509 unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
510 unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
511 unsigned long pt_page;
512 u32 *addr, *save_addr;
513 unsigned long i;
514 struct page *page;
515
516 for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
517 page = vmw_piter_page(pt_iter);
518
519 save_addr = addr = kmap_atomic(page);
520
521 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
522 vmw_mob_assign_ppn(&addr,
523 vmw_piter_dma_addr(data_iter));
524 if (unlikely(--num_data_pages == 0))
525 break;
526 WARN_ON(!vmw_piter_next(data_iter));
527 }
528 kunmap_atomic(save_addr);
529 vmw_piter_next(pt_iter);
530 }
531
532 return num_pt_pages;
533}
534
535/*
536 * vmw_mob_build_pt - Set up a multilevel mob pagetable
537 *
538 * @mob: Pointer to a mob whose page table needs setting up.
539 * @data_addr Array of DMA addresses to the buffer object's data
540 * pages.
541 * @num_data_pages: Number of buffer object data pages.
542 *
543 * Uses tail recursion to set up a multilevel mob page table.
544 */
545static void vmw_mob_pt_setup(struct vmw_mob *mob,
546 struct vmw_piter data_iter,
547 unsigned long num_data_pages)
548{
549 unsigned long num_pt_pages = 0;
550 struct ttm_buffer_object *bo = mob->pt_bo;
551 struct vmw_piter save_pt_iter;
552 struct vmw_piter pt_iter;
553 const struct vmw_sg_table *vsgt;
554 int ret;
555
556 ret = ttm_bo_reserve(bo, false, true, NULL);
557 BUG_ON(ret != 0);
558
559 vsgt = vmw_bo_sg_table(bo);
560 vmw_piter_start(&pt_iter, vsgt, 0);
561 BUG_ON(!vmw_piter_next(&pt_iter));
562 mob->pt_level = 0;
563 while (likely(num_data_pages > 1)) {
564 ++mob->pt_level;
565 BUG_ON(mob->pt_level > 2);
566 save_pt_iter = pt_iter;
567 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
568 &pt_iter);
569 data_iter = save_pt_iter;
570 num_data_pages = num_pt_pages;
571 }
572
573 mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
574 ttm_bo_unreserve(bo);
575}
576
577/*
578 * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
579 *
580 * @mob: Pointer to a mob to destroy.
581 */
582void vmw_mob_destroy(struct vmw_mob *mob)
583{
584 if (mob->pt_bo) {
585 ttm_bo_put(mob->pt_bo);
586 mob->pt_bo = NULL;
587 }
588 kfree(mob);
589}
590
591/*
592 * vmw_mob_unbind - Hide a mob from the device.
593 *
594 * @dev_priv: Pointer to a device private.
595 * @mob_id: Device id of the mob to unbind.
596 */
597void vmw_mob_unbind(struct vmw_private *dev_priv,
598 struct vmw_mob *mob)
599{
600 struct {
601 SVGA3dCmdHeader header;
602 SVGA3dCmdDestroyGBMob body;
603 } *cmd;
604 int ret;
605 struct ttm_buffer_object *bo = mob->pt_bo;
606
607 if (bo) {
608 ret = ttm_bo_reserve(bo, false, true, NULL);
609 /*
610 * Noone else should be using this buffer.
611 */
612 BUG_ON(ret != 0);
613 }
614
615 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
616 if (cmd) {
617 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
618 cmd->header.size = sizeof(cmd->body);
619 cmd->body.mobid = mob->id;
620 vmw_fifo_commit(dev_priv, sizeof(*cmd));
621 }
622
623 if (bo) {
624 vmw_bo_fence_single(bo, NULL);
625 ttm_bo_unreserve(bo);
626 }
627 vmw_fifo_resource_dec(dev_priv);
628}
629
630/*
631 * vmw_mob_bind - Make a mob visible to the device after first
632 * populating it if necessary.
633 *
634 * @dev_priv: Pointer to a device private.
635 * @mob: Pointer to the mob we're making visible.
636 * @data_addr: Array of DMA addresses to the data pages of the underlying
637 * buffer object.
638 * @num_data_pages: Number of data pages of the underlying buffer
639 * object.
640 * @mob_id: Device id of the mob to bind
641 *
642 * This function is intended to be interfaced with the ttm_tt backend
643 * code.
644 */
645int vmw_mob_bind(struct vmw_private *dev_priv,
646 struct vmw_mob *mob,
647 const struct vmw_sg_table *vsgt,
648 unsigned long num_data_pages,
649 int32_t mob_id)
650{
651 int ret;
652 bool pt_set_up = false;
653 struct vmw_piter data_iter;
654 struct {
655 SVGA3dCmdHeader header;
656 SVGA3dCmdDefineGBMob64 body;
657 } *cmd;
658
659 mob->id = mob_id;
660 vmw_piter_start(&data_iter, vsgt, 0);
661 if (unlikely(!vmw_piter_next(&data_iter)))
662 return 0;
663
664 if (likely(num_data_pages == 1)) {
665 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
666 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
667 } else if (vsgt->num_regions == 1) {
668 mob->pt_level = SVGA3D_MOBFMT_RANGE;
669 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
670 } else if (unlikely(mob->pt_bo == NULL)) {
671 ret = vmw_mob_pt_populate(dev_priv, mob);
672 if (unlikely(ret != 0))
673 return ret;
674
675 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
676 pt_set_up = true;
677 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
678 }
679
680 vmw_fifo_resource_inc(dev_priv);
681
682 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
683 if (unlikely(cmd == NULL))
684 goto out_no_cmd_space;
685
686 cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
687 cmd->header.size = sizeof(cmd->body);
688 cmd->body.mobid = mob_id;
689 cmd->body.ptDepth = mob->pt_level;
690 cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
691 cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
692
693 vmw_fifo_commit(dev_priv, sizeof(*cmd));
694
695 return 0;
696
697out_no_cmd_space:
698 vmw_fifo_resource_dec(dev_priv);
699 if (pt_set_up) {
700 ttm_bo_put(mob->pt_bo);
701 mob->pt_bo = NULL;
702 }
703
704 return -ENOMEM;
705}
1/**************************************************************************
2 *
3 * Copyright © 2012-2015 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include "vmwgfx_drv.h"
29
30/*
31 * If we set up the screen target otable, screen objects stop working.
32 */
33
34#define VMW_OTABLE_SETUP_SUB ((VMWGFX_ENABLE_SCREEN_TARGET_OTABLE ? 0 : 1))
35
36#ifdef CONFIG_64BIT
37#define VMW_PPN_SIZE 8
38#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH64_0
39#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH64_1
40#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH64_2
41#else
42#define VMW_PPN_SIZE 4
43#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PTDEPTH_0
44#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PTDEPTH_1
45#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PTDEPTH_2
46#endif
47
48/*
49 * struct vmw_mob - Structure containing page table and metadata for a
50 * Guest Memory OBject.
51 *
52 * @num_pages Number of pages that make up the page table.
53 * @pt_level The indirection level of the page table. 0-2.
54 * @pt_root_page DMA address of the level 0 page of the page table.
55 */
56struct vmw_mob {
57 struct ttm_buffer_object *pt_bo;
58 unsigned long num_pages;
59 unsigned pt_level;
60 dma_addr_t pt_root_page;
61 uint32_t id;
62};
63
64/*
65 * struct vmw_otable - Guest Memory OBject table metadata
66 *
67 * @size: Size of the table (page-aligned).
68 * @page_table: Pointer to a struct vmw_mob holding the page table.
69 */
70static const struct vmw_otable pre_dx_tables[] = {
71 {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
72 {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
73 {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
74 {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
75 {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
76 NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE}
77};
78
79static const struct vmw_otable dx_tables[] = {
80 {VMWGFX_NUM_MOB * SVGA3D_OTABLE_MOB_ENTRY_SIZE, NULL, true},
81 {VMWGFX_NUM_GB_SURFACE * SVGA3D_OTABLE_SURFACE_ENTRY_SIZE, NULL, true},
82 {VMWGFX_NUM_GB_CONTEXT * SVGA3D_OTABLE_CONTEXT_ENTRY_SIZE, NULL, true},
83 {VMWGFX_NUM_GB_SHADER * SVGA3D_OTABLE_SHADER_ENTRY_SIZE, NULL, true},
84 {VMWGFX_NUM_GB_SCREEN_TARGET * SVGA3D_OTABLE_SCREEN_TARGET_ENTRY_SIZE,
85 NULL, VMWGFX_ENABLE_SCREEN_TARGET_OTABLE},
86 {VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true},
87};
88
89static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
90 struct vmw_mob *mob);
91static void vmw_mob_pt_setup(struct vmw_mob *mob,
92 struct vmw_piter data_iter,
93 unsigned long num_data_pages);
94
95/*
96 * vmw_setup_otable_base - Issue an object table base setup command to
97 * the device
98 *
99 * @dev_priv: Pointer to a device private structure
100 * @type: Type of object table base
101 * @offset Start of table offset into dev_priv::otable_bo
102 * @otable Pointer to otable metadata;
103 *
104 * This function returns -ENOMEM if it fails to reserve fifo space,
105 * and may block waiting for fifo space.
106 */
107static int vmw_setup_otable_base(struct vmw_private *dev_priv,
108 SVGAOTableType type,
109 struct ttm_buffer_object *otable_bo,
110 unsigned long offset,
111 struct vmw_otable *otable)
112{
113 struct {
114 SVGA3dCmdHeader header;
115 SVGA3dCmdSetOTableBase64 body;
116 } *cmd;
117 struct vmw_mob *mob;
118 const struct vmw_sg_table *vsgt;
119 struct vmw_piter iter;
120 int ret;
121
122 BUG_ON(otable->page_table != NULL);
123
124 vsgt = vmw_bo_sg_table(otable_bo);
125 vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
126 WARN_ON(!vmw_piter_next(&iter));
127
128 mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
129 if (unlikely(mob == NULL)) {
130 DRM_ERROR("Failed creating OTable page table.\n");
131 return -ENOMEM;
132 }
133
134 if (otable->size <= PAGE_SIZE) {
135 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
136 mob->pt_root_page = vmw_piter_dma_addr(&iter);
137 } else if (vsgt->num_regions == 1) {
138 mob->pt_level = SVGA3D_MOBFMT_RANGE;
139 mob->pt_root_page = vmw_piter_dma_addr(&iter);
140 } else {
141 ret = vmw_mob_pt_populate(dev_priv, mob);
142 if (unlikely(ret != 0))
143 goto out_no_populate;
144
145 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
146 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
147 }
148
149 cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
150 if (unlikely(cmd == NULL)) {
151 DRM_ERROR("Failed reserving FIFO space for OTable setup.\n");
152 ret = -ENOMEM;
153 goto out_no_fifo;
154 }
155
156 memset(cmd, 0, sizeof(*cmd));
157 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
158 cmd->header.size = sizeof(cmd->body);
159 cmd->body.type = type;
160 cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
161 cmd->body.sizeInBytes = otable->size;
162 cmd->body.validSizeInBytes = 0;
163 cmd->body.ptDepth = mob->pt_level;
164
165 /*
166 * The device doesn't support this, But the otable size is
167 * determined at compile-time, so this BUG shouldn't trigger
168 * randomly.
169 */
170 BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
171
172 vmw_fifo_commit(dev_priv, sizeof(*cmd));
173 otable->page_table = mob;
174
175 return 0;
176
177out_no_fifo:
178out_no_populate:
179 vmw_mob_destroy(mob);
180 return ret;
181}
182
183/*
184 * vmw_takedown_otable_base - Issue an object table base takedown command
185 * to the device
186 *
187 * @dev_priv: Pointer to a device private structure
188 * @type: Type of object table base
189 *
190 */
191static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
192 SVGAOTableType type,
193 struct vmw_otable *otable)
194{
195 struct {
196 SVGA3dCmdHeader header;
197 SVGA3dCmdSetOTableBase body;
198 } *cmd;
199 struct ttm_buffer_object *bo;
200
201 if (otable->page_table == NULL)
202 return;
203
204 bo = otable->page_table->pt_bo;
205 cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
206 if (unlikely(cmd == NULL)) {
207 DRM_ERROR("Failed reserving FIFO space for OTable "
208 "takedown.\n");
209 return;
210 }
211
212 memset(cmd, 0, sizeof(*cmd));
213 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
214 cmd->header.size = sizeof(cmd->body);
215 cmd->body.type = type;
216 cmd->body.baseAddress = 0;
217 cmd->body.sizeInBytes = 0;
218 cmd->body.validSizeInBytes = 0;
219 cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
220 vmw_fifo_commit(dev_priv, sizeof(*cmd));
221
222 if (bo) {
223 int ret;
224
225 ret = ttm_bo_reserve(bo, false, true, false, NULL);
226 BUG_ON(ret != 0);
227
228 vmw_fence_single_bo(bo, NULL);
229 ttm_bo_unreserve(bo);
230 }
231
232 vmw_mob_destroy(otable->page_table);
233 otable->page_table = NULL;
234}
235
236
237static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
238 struct vmw_otable_batch *batch)
239{
240 unsigned long offset;
241 unsigned long bo_size;
242 struct vmw_otable *otables = batch->otables;
243 SVGAOTableType i;
244 int ret;
245
246 bo_size = 0;
247 for (i = 0; i < batch->num_otables; ++i) {
248 if (!otables[i].enabled)
249 continue;
250
251 otables[i].size =
252 (otables[i].size + PAGE_SIZE - 1) & PAGE_MASK;
253 bo_size += otables[i].size;
254 }
255
256 ret = ttm_bo_create(&dev_priv->bdev, bo_size,
257 ttm_bo_type_device,
258 &vmw_sys_ne_placement,
259 0, false, NULL,
260 &batch->otable_bo);
261
262 if (unlikely(ret != 0))
263 goto out_no_bo;
264
265 ret = ttm_bo_reserve(batch->otable_bo, false, true, false, NULL);
266 BUG_ON(ret != 0);
267 ret = vmw_bo_driver.ttm_tt_populate(batch->otable_bo->ttm);
268 if (unlikely(ret != 0))
269 goto out_unreserve;
270 ret = vmw_bo_map_dma(batch->otable_bo);
271 if (unlikely(ret != 0))
272 goto out_unreserve;
273
274 ttm_bo_unreserve(batch->otable_bo);
275
276 offset = 0;
277 for (i = 0; i < batch->num_otables; ++i) {
278 if (!batch->otables[i].enabled)
279 continue;
280
281 ret = vmw_setup_otable_base(dev_priv, i, batch->otable_bo,
282 offset,
283 &otables[i]);
284 if (unlikely(ret != 0))
285 goto out_no_setup;
286 offset += otables[i].size;
287 }
288
289 return 0;
290
291out_unreserve:
292 ttm_bo_unreserve(batch->otable_bo);
293out_no_setup:
294 for (i = 0; i < batch->num_otables; ++i) {
295 if (batch->otables[i].enabled)
296 vmw_takedown_otable_base(dev_priv, i,
297 &batch->otables[i]);
298 }
299
300 ttm_bo_unref(&batch->otable_bo);
301out_no_bo:
302 return ret;
303}
304
305/*
306 * vmw_otables_setup - Set up guest backed memory object tables
307 *
308 * @dev_priv: Pointer to a device private structure
309 *
310 * Takes care of the device guest backed surface
311 * initialization, by setting up the guest backed memory object tables.
312 * Returns 0 on success and various error codes on failure. A successful return
313 * means the object tables can be taken down using the vmw_otables_takedown
314 * function.
315 */
316int vmw_otables_setup(struct vmw_private *dev_priv)
317{
318 struct vmw_otable **otables = &dev_priv->otable_batch.otables;
319 int ret;
320
321 if (dev_priv->has_dx) {
322 *otables = kmalloc(sizeof(dx_tables), GFP_KERNEL);
323 if (*otables == NULL)
324 return -ENOMEM;
325
326 memcpy(*otables, dx_tables, sizeof(dx_tables));
327 dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables);
328 } else {
329 *otables = kmalloc(sizeof(pre_dx_tables), GFP_KERNEL);
330 if (*otables == NULL)
331 return -ENOMEM;
332
333 memcpy(*otables, pre_dx_tables, sizeof(pre_dx_tables));
334 dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables);
335 }
336
337 ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch);
338 if (unlikely(ret != 0))
339 goto out_setup;
340
341 return 0;
342
343out_setup:
344 kfree(*otables);
345 return ret;
346}
347
348static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
349 struct vmw_otable_batch *batch)
350{
351 SVGAOTableType i;
352 struct ttm_buffer_object *bo = batch->otable_bo;
353 int ret;
354
355 for (i = 0; i < batch->num_otables; ++i)
356 if (batch->otables[i].enabled)
357 vmw_takedown_otable_base(dev_priv, i,
358 &batch->otables[i]);
359
360 ret = ttm_bo_reserve(bo, false, true, false, NULL);
361 BUG_ON(ret != 0);
362
363 vmw_fence_single_bo(bo, NULL);
364 ttm_bo_unreserve(bo);
365
366 ttm_bo_unref(&batch->otable_bo);
367}
368
369/*
370 * vmw_otables_takedown - Take down guest backed memory object tables
371 *
372 * @dev_priv: Pointer to a device private structure
373 *
374 * Take down the Guest Memory Object tables.
375 */
376void vmw_otables_takedown(struct vmw_private *dev_priv)
377{
378 vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch);
379 kfree(dev_priv->otable_batch.otables);
380}
381
382/*
383 * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
384 * needed for a guest backed memory object.
385 *
386 * @data_pages: Number of data pages in the memory object buffer.
387 */
388static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
389{
390 unsigned long data_size = data_pages * PAGE_SIZE;
391 unsigned long tot_size = 0;
392
393 while (likely(data_size > PAGE_SIZE)) {
394 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
395 data_size *= VMW_PPN_SIZE;
396 tot_size += (data_size + PAGE_SIZE - 1) & PAGE_MASK;
397 }
398
399 return tot_size >> PAGE_SHIFT;
400}
401
402/*
403 * vmw_mob_create - Create a mob, but don't populate it.
404 *
405 * @data_pages: Number of data pages of the underlying buffer object.
406 */
407struct vmw_mob *vmw_mob_create(unsigned long data_pages)
408{
409 struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
410
411 if (unlikely(mob == NULL))
412 return NULL;
413
414 mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
415
416 return mob;
417}
418
419/*
420 * vmw_mob_pt_populate - Populate the mob pagetable
421 *
422 * @mob: Pointer to the mob the pagetable of which we want to
423 * populate.
424 *
425 * This function allocates memory to be used for the pagetable, and
426 * adjusts TTM memory accounting accordingly. Returns ENOMEM if
427 * memory resources aren't sufficient and may cause TTM buffer objects
428 * to be swapped out by using the TTM memory accounting function.
429 */
430static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
431 struct vmw_mob *mob)
432{
433 int ret;
434 BUG_ON(mob->pt_bo != NULL);
435
436 ret = ttm_bo_create(&dev_priv->bdev, mob->num_pages * PAGE_SIZE,
437 ttm_bo_type_device,
438 &vmw_sys_ne_placement,
439 0, false, NULL, &mob->pt_bo);
440 if (unlikely(ret != 0))
441 return ret;
442
443 ret = ttm_bo_reserve(mob->pt_bo, false, true, false, NULL);
444
445 BUG_ON(ret != 0);
446 ret = vmw_bo_driver.ttm_tt_populate(mob->pt_bo->ttm);
447 if (unlikely(ret != 0))
448 goto out_unreserve;
449 ret = vmw_bo_map_dma(mob->pt_bo);
450 if (unlikely(ret != 0))
451 goto out_unreserve;
452
453 ttm_bo_unreserve(mob->pt_bo);
454
455 return 0;
456
457out_unreserve:
458 ttm_bo_unreserve(mob->pt_bo);
459 ttm_bo_unref(&mob->pt_bo);
460
461 return ret;
462}
463
464/**
465 * vmw_mob_assign_ppn - Assign a value to a page table entry
466 *
467 * @addr: Pointer to pointer to page table entry.
468 * @val: The page table entry
469 *
470 * Assigns a value to a page table entry pointed to by *@addr and increments
471 * *@addr according to the page table entry size.
472 */
473#if (VMW_PPN_SIZE == 8)
474static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
475{
476 *((u64 *) *addr) = val >> PAGE_SHIFT;
477 *addr += 2;
478}
479#else
480static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
481{
482 *(*addr)++ = val >> PAGE_SHIFT;
483}
484#endif
485
486/*
487 * vmw_mob_build_pt - Build a pagetable
488 *
489 * @data_addr: Array of DMA addresses to the underlying buffer
490 * object's data pages.
491 * @num_data_pages: Number of buffer object data pages.
492 * @pt_pages: Array of page pointers to the page table pages.
493 *
494 * Returns the number of page table pages actually used.
495 * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
496 */
497static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
498 unsigned long num_data_pages,
499 struct vmw_piter *pt_iter)
500{
501 unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
502 unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
503 unsigned long pt_page;
504 u32 *addr, *save_addr;
505 unsigned long i;
506 struct page *page;
507
508 for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
509 page = vmw_piter_page(pt_iter);
510
511 save_addr = addr = kmap_atomic(page);
512
513 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
514 vmw_mob_assign_ppn(&addr,
515 vmw_piter_dma_addr(data_iter));
516 if (unlikely(--num_data_pages == 0))
517 break;
518 WARN_ON(!vmw_piter_next(data_iter));
519 }
520 kunmap_atomic(save_addr);
521 vmw_piter_next(pt_iter);
522 }
523
524 return num_pt_pages;
525}
526
527/*
528 * vmw_mob_build_pt - Set up a multilevel mob pagetable
529 *
530 * @mob: Pointer to a mob whose page table needs setting up.
531 * @data_addr Array of DMA addresses to the buffer object's data
532 * pages.
533 * @num_data_pages: Number of buffer object data pages.
534 *
535 * Uses tail recursion to set up a multilevel mob page table.
536 */
537static void vmw_mob_pt_setup(struct vmw_mob *mob,
538 struct vmw_piter data_iter,
539 unsigned long num_data_pages)
540{
541 unsigned long num_pt_pages = 0;
542 struct ttm_buffer_object *bo = mob->pt_bo;
543 struct vmw_piter save_pt_iter;
544 struct vmw_piter pt_iter;
545 const struct vmw_sg_table *vsgt;
546 int ret;
547
548 ret = ttm_bo_reserve(bo, false, true, false, NULL);
549 BUG_ON(ret != 0);
550
551 vsgt = vmw_bo_sg_table(bo);
552 vmw_piter_start(&pt_iter, vsgt, 0);
553 BUG_ON(!vmw_piter_next(&pt_iter));
554 mob->pt_level = 0;
555 while (likely(num_data_pages > 1)) {
556 ++mob->pt_level;
557 BUG_ON(mob->pt_level > 2);
558 save_pt_iter = pt_iter;
559 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
560 &pt_iter);
561 data_iter = save_pt_iter;
562 num_data_pages = num_pt_pages;
563 }
564
565 mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
566 ttm_bo_unreserve(bo);
567}
568
569/*
570 * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
571 *
572 * @mob: Pointer to a mob to destroy.
573 */
574void vmw_mob_destroy(struct vmw_mob *mob)
575{
576 if (mob->pt_bo)
577 ttm_bo_unref(&mob->pt_bo);
578 kfree(mob);
579}
580
581/*
582 * vmw_mob_unbind - Hide a mob from the device.
583 *
584 * @dev_priv: Pointer to a device private.
585 * @mob_id: Device id of the mob to unbind.
586 */
587void vmw_mob_unbind(struct vmw_private *dev_priv,
588 struct vmw_mob *mob)
589{
590 struct {
591 SVGA3dCmdHeader header;
592 SVGA3dCmdDestroyGBMob body;
593 } *cmd;
594 int ret;
595 struct ttm_buffer_object *bo = mob->pt_bo;
596
597 if (bo) {
598 ret = ttm_bo_reserve(bo, false, true, false, NULL);
599 /*
600 * Noone else should be using this buffer.
601 */
602 BUG_ON(ret != 0);
603 }
604
605 cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
606 if (unlikely(cmd == NULL)) {
607 DRM_ERROR("Failed reserving FIFO space for Memory "
608 "Object unbinding.\n");
609 } else {
610 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
611 cmd->header.size = sizeof(cmd->body);
612 cmd->body.mobid = mob->id;
613 vmw_fifo_commit(dev_priv, sizeof(*cmd));
614 }
615 if (bo) {
616 vmw_fence_single_bo(bo, NULL);
617 ttm_bo_unreserve(bo);
618 }
619 vmw_fifo_resource_dec(dev_priv);
620}
621
622/*
623 * vmw_mob_bind - Make a mob visible to the device after first
624 * populating it if necessary.
625 *
626 * @dev_priv: Pointer to a device private.
627 * @mob: Pointer to the mob we're making visible.
628 * @data_addr: Array of DMA addresses to the data pages of the underlying
629 * buffer object.
630 * @num_data_pages: Number of data pages of the underlying buffer
631 * object.
632 * @mob_id: Device id of the mob to bind
633 *
634 * This function is intended to be interfaced with the ttm_tt backend
635 * code.
636 */
637int vmw_mob_bind(struct vmw_private *dev_priv,
638 struct vmw_mob *mob,
639 const struct vmw_sg_table *vsgt,
640 unsigned long num_data_pages,
641 int32_t mob_id)
642{
643 int ret;
644 bool pt_set_up = false;
645 struct vmw_piter data_iter;
646 struct {
647 SVGA3dCmdHeader header;
648 SVGA3dCmdDefineGBMob64 body;
649 } *cmd;
650
651 mob->id = mob_id;
652 vmw_piter_start(&data_iter, vsgt, 0);
653 if (unlikely(!vmw_piter_next(&data_iter)))
654 return 0;
655
656 if (likely(num_data_pages == 1)) {
657 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
658 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
659 } else if (vsgt->num_regions == 1) {
660 mob->pt_level = SVGA3D_MOBFMT_RANGE;
661 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
662 } else if (unlikely(mob->pt_bo == NULL)) {
663 ret = vmw_mob_pt_populate(dev_priv, mob);
664 if (unlikely(ret != 0))
665 return ret;
666
667 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
668 pt_set_up = true;
669 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PTDEPTH_1;
670 }
671
672 vmw_fifo_resource_inc(dev_priv);
673
674 cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
675 if (unlikely(cmd == NULL)) {
676 DRM_ERROR("Failed reserving FIFO space for Memory "
677 "Object binding.\n");
678 goto out_no_cmd_space;
679 }
680
681 cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
682 cmd->header.size = sizeof(cmd->body);
683 cmd->body.mobid = mob_id;
684 cmd->body.ptDepth = mob->pt_level;
685 cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
686 cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
687
688 vmw_fifo_commit(dev_priv, sizeof(*cmd));
689
690 return 0;
691
692out_no_cmd_space:
693 vmw_fifo_resource_dec(dev_priv);
694 if (pt_set_up)
695 ttm_bo_unref(&mob->pt_bo);
696
697 return -ENOMEM;
698}