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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2012-2021 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#ifdef CONFIG_64BIT
33#define VMW_PPN_SIZE 8
34#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PT64_0
35#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PT64_1
36#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PT64_2
37#else
38#define VMW_PPN_SIZE 4
39#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PT_0
40#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PT_1
41#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PT_2
42#endif
43
44/*
45 * struct vmw_mob - Structure containing page table and metadata for a
46 * Guest Memory OBject.
47 *
48 * @num_pages Number of pages that make up the page table.
49 * @pt_level The indirection level of the page table. 0-2.
50 * @pt_root_page DMA address of the level 0 page of the page table.
51 */
52struct vmw_mob {
53 struct ttm_buffer_object *pt_bo;
54 unsigned long num_pages;
55 unsigned pt_level;
56 dma_addr_t pt_root_page;
57 uint32_t id;
58};
59
60/*
61 * struct vmw_otable - Guest Memory OBject table metadata
62 *
63 * @size: Size of the table (page-aligned).
64 * @page_table: Pointer to a struct vmw_mob holding the page table.
65 */
66static const struct vmw_otable pre_dx_tables[] = {
67 {VMWGFX_NUM_MOB * sizeof(SVGAOTableMobEntry), NULL, true},
68 {VMWGFX_NUM_GB_SURFACE * sizeof(SVGAOTableSurfaceEntry), NULL, true},
69 {VMWGFX_NUM_GB_CONTEXT * sizeof(SVGAOTableContextEntry), NULL, true},
70 {VMWGFX_NUM_GB_SHADER * sizeof(SVGAOTableShaderEntry), NULL, true},
71 {VMWGFX_NUM_GB_SCREEN_TARGET * sizeof(SVGAOTableScreenTargetEntry),
72 NULL, true}
73};
74
75static const struct vmw_otable dx_tables[] = {
76 {VMWGFX_NUM_MOB * sizeof(SVGAOTableMobEntry), NULL, true},
77 {VMWGFX_NUM_GB_SURFACE * sizeof(SVGAOTableSurfaceEntry), NULL, true},
78 {VMWGFX_NUM_GB_CONTEXT * sizeof(SVGAOTableContextEntry), NULL, true},
79 {VMWGFX_NUM_GB_SHADER * sizeof(SVGAOTableShaderEntry), NULL, true},
80 {VMWGFX_NUM_GB_SCREEN_TARGET * sizeof(SVGAOTableScreenTargetEntry),
81 NULL, true},
82 {VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true},
83};
84
85static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
86 struct vmw_mob *mob);
87static void vmw_mob_pt_setup(struct vmw_mob *mob,
88 struct vmw_piter data_iter,
89 unsigned long num_data_pages);
90
91
92static inline void vmw_bo_unpin_unlocked(struct ttm_buffer_object *bo)
93{
94 int ret = ttm_bo_reserve(bo, false, true, NULL);
95 BUG_ON(ret != 0);
96 ttm_bo_unpin(bo);
97 ttm_bo_unreserve(bo);
98}
99
100
101/*
102 * vmw_setup_otable_base - Issue an object table base setup command to
103 * the device
104 *
105 * @dev_priv: Pointer to a device private structure
106 * @type: Type of object table base
107 * @offset Start of table offset into dev_priv::otable_bo
108 * @otable Pointer to otable metadata;
109 *
110 * This function returns -ENOMEM if it fails to reserve fifo space,
111 * and may block waiting for fifo space.
112 */
113static int vmw_setup_otable_base(struct vmw_private *dev_priv,
114 SVGAOTableType type,
115 struct ttm_buffer_object *otable_bo,
116 unsigned long offset,
117 struct vmw_otable *otable)
118{
119 struct {
120 SVGA3dCmdHeader header;
121 SVGA3dCmdSetOTableBase64 body;
122 } *cmd;
123 struct vmw_mob *mob;
124 const struct vmw_sg_table *vsgt;
125 struct vmw_piter iter;
126 int ret;
127
128 BUG_ON(otable->page_table != NULL);
129
130 vsgt = vmw_bo_sg_table(otable_bo);
131 vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
132 WARN_ON(!vmw_piter_next(&iter));
133
134 mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
135 if (unlikely(mob == NULL)) {
136 DRM_ERROR("Failed creating OTable page table.\n");
137 return -ENOMEM;
138 }
139
140 if (otable->size <= PAGE_SIZE) {
141 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
142 mob->pt_root_page = vmw_piter_dma_addr(&iter);
143 } else {
144 ret = vmw_mob_pt_populate(dev_priv, mob);
145 if (unlikely(ret != 0))
146 goto out_no_populate;
147
148 vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
149 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PT_1;
150 }
151
152 cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
153 if (unlikely(cmd == NULL)) {
154 ret = -ENOMEM;
155 goto out_no_fifo;
156 }
157
158 memset(cmd, 0, sizeof(*cmd));
159 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
160 cmd->header.size = sizeof(cmd->body);
161 cmd->body.type = type;
162 cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
163 cmd->body.sizeInBytes = otable->size;
164 cmd->body.validSizeInBytes = 0;
165 cmd->body.ptDepth = mob->pt_level;
166
167 /*
168 * The device doesn't support this, But the otable size is
169 * determined at compile-time, so this BUG shouldn't trigger
170 * randomly.
171 */
172 BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
173
174 vmw_cmd_commit(dev_priv, sizeof(*cmd));
175 otable->page_table = mob;
176
177 return 0;
178
179out_no_fifo:
180out_no_populate:
181 vmw_mob_destroy(mob);
182 return ret;
183}
184
185/*
186 * vmw_takedown_otable_base - Issue an object table base takedown command
187 * to the device
188 *
189 * @dev_priv: Pointer to a device private structure
190 * @type: Type of object table base
191 *
192 */
193static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
194 SVGAOTableType type,
195 struct vmw_otable *otable)
196{
197 struct {
198 SVGA3dCmdHeader header;
199 SVGA3dCmdSetOTableBase body;
200 } *cmd;
201 struct ttm_buffer_object *bo;
202
203 if (otable->page_table == NULL)
204 return;
205
206 bo = otable->page_table->pt_bo;
207 cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
208 if (unlikely(cmd == NULL))
209 return;
210
211 memset(cmd, 0, sizeof(*cmd));
212 cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
213 cmd->header.size = sizeof(cmd->body);
214 cmd->body.type = type;
215 cmd->body.baseAddress = 0;
216 cmd->body.sizeInBytes = 0;
217 cmd->body.validSizeInBytes = 0;
218 cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
219 vmw_cmd_commit(dev_priv, sizeof(*cmd));
220
221 if (bo) {
222 int ret;
223
224 ret = ttm_bo_reserve(bo, false, true, NULL);
225 BUG_ON(ret != 0);
226
227 vmw_bo_fence_single(bo, NULL);
228 ttm_bo_unreserve(bo);
229 }
230
231 vmw_mob_destroy(otable->page_table);
232 otable->page_table = NULL;
233}
234
235
236static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
237 struct vmw_otable_batch *batch)
238{
239 unsigned long offset;
240 unsigned long bo_size;
241 struct vmw_otable *otables = batch->otables;
242 SVGAOTableType i;
243 int ret;
244
245 bo_size = 0;
246 for (i = 0; i < batch->num_otables; ++i) {
247 if (!otables[i].enabled)
248 continue;
249
250 otables[i].size = PFN_ALIGN(otables[i].size);
251 bo_size += otables[i].size;
252 }
253
254 ret = vmw_bo_create_and_populate(dev_priv, bo_size, &batch->otable_bo);
255 if (unlikely(ret != 0))
256 return ret;
257
258 offset = 0;
259 for (i = 0; i < batch->num_otables; ++i) {
260 if (!batch->otables[i].enabled)
261 continue;
262
263 ret = vmw_setup_otable_base(dev_priv, i, batch->otable_bo,
264 offset,
265 &otables[i]);
266 if (unlikely(ret != 0))
267 goto out_no_setup;
268 offset += otables[i].size;
269 }
270
271 return 0;
272
273out_no_setup:
274 for (i = 0; i < batch->num_otables; ++i) {
275 if (batch->otables[i].enabled)
276 vmw_takedown_otable_base(dev_priv, i,
277 &batch->otables[i]);
278 }
279
280 vmw_bo_unpin_unlocked(batch->otable_bo);
281 ttm_bo_put(batch->otable_bo);
282 batch->otable_bo = NULL;
283 return ret;
284}
285
286/*
287 * vmw_otables_setup - Set up guest backed memory object tables
288 *
289 * @dev_priv: Pointer to a device private structure
290 *
291 * Takes care of the device guest backed surface
292 * initialization, by setting up the guest backed memory object tables.
293 * Returns 0 on success and various error codes on failure. A successful return
294 * means the object tables can be taken down using the vmw_otables_takedown
295 * function.
296 */
297int vmw_otables_setup(struct vmw_private *dev_priv)
298{
299 struct vmw_otable **otables = &dev_priv->otable_batch.otables;
300 int ret;
301
302 if (has_sm4_context(dev_priv)) {
303 *otables = kmemdup(dx_tables, sizeof(dx_tables), GFP_KERNEL);
304 if (!(*otables))
305 return -ENOMEM;
306
307 dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables);
308 } else {
309 *otables = kmemdup(pre_dx_tables, sizeof(pre_dx_tables),
310 GFP_KERNEL);
311 if (!(*otables))
312 return -ENOMEM;
313
314 dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables);
315 }
316
317 ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch);
318 if (unlikely(ret != 0))
319 goto out_setup;
320
321 return 0;
322
323out_setup:
324 kfree(*otables);
325 return ret;
326}
327
328static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
329 struct vmw_otable_batch *batch)
330{
331 SVGAOTableType i;
332 struct ttm_buffer_object *bo = batch->otable_bo;
333 int ret;
334
335 for (i = 0; i < batch->num_otables; ++i)
336 if (batch->otables[i].enabled)
337 vmw_takedown_otable_base(dev_priv, i,
338 &batch->otables[i]);
339
340 ret = ttm_bo_reserve(bo, false, true, NULL);
341 BUG_ON(ret != 0);
342
343 vmw_bo_fence_single(bo, NULL);
344 ttm_bo_unpin(bo);
345 ttm_bo_unreserve(bo);
346
347 ttm_bo_put(batch->otable_bo);
348 batch->otable_bo = NULL;
349}
350
351/*
352 * vmw_otables_takedown - Take down guest backed memory object tables
353 *
354 * @dev_priv: Pointer to a device private structure
355 *
356 * Take down the Guest Memory Object tables.
357 */
358void vmw_otables_takedown(struct vmw_private *dev_priv)
359{
360 vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch);
361 kfree(dev_priv->otable_batch.otables);
362}
363
364/*
365 * vmw_mob_calculate_pt_pages - Calculate the number of page table pages
366 * needed for a guest backed memory object.
367 *
368 * @data_pages: Number of data pages in the memory object buffer.
369 */
370static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
371{
372 unsigned long data_size = data_pages * PAGE_SIZE;
373 unsigned long tot_size = 0;
374
375 while (likely(data_size > PAGE_SIZE)) {
376 data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
377 data_size *= VMW_PPN_SIZE;
378 tot_size += PFN_ALIGN(data_size);
379 }
380
381 return tot_size >> PAGE_SHIFT;
382}
383
384/*
385 * vmw_mob_create - Create a mob, but don't populate it.
386 *
387 * @data_pages: Number of data pages of the underlying buffer object.
388 */
389struct vmw_mob *vmw_mob_create(unsigned long data_pages)
390{
391 struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
392
393 if (unlikely(!mob))
394 return NULL;
395
396 mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
397
398 return mob;
399}
400
401/*
402 * vmw_mob_pt_populate - Populate the mob pagetable
403 *
404 * @mob: Pointer to the mob the pagetable of which we want to
405 * populate.
406 *
407 * This function allocates memory to be used for the pagetable.
408 * Returns ENOMEM if memory resources aren't sufficient and may
409 * cause TTM buffer objects to be swapped out.
410 */
411static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
412 struct vmw_mob *mob)
413{
414 BUG_ON(mob->pt_bo != NULL);
415
416 return vmw_bo_create_and_populate(dev_priv, mob->num_pages * PAGE_SIZE, &mob->pt_bo);
417}
418
419/**
420 * vmw_mob_assign_ppn - Assign a value to a page table entry
421 *
422 * @addr: Pointer to pointer to page table entry.
423 * @val: The page table entry
424 *
425 * Assigns a value to a page table entry pointed to by *@addr and increments
426 * *@addr according to the page table entry size.
427 */
428#if (VMW_PPN_SIZE == 8)
429static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
430{
431 *((u64 *) *addr) = val >> PAGE_SHIFT;
432 *addr += 2;
433}
434#else
435static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
436{
437 *(*addr)++ = val >> PAGE_SHIFT;
438}
439#endif
440
441/*
442 * vmw_mob_build_pt - Build a pagetable
443 *
444 * @data_addr: Array of DMA addresses to the underlying buffer
445 * object's data pages.
446 * @num_data_pages: Number of buffer object data pages.
447 * @pt_pages: Array of page pointers to the page table pages.
448 *
449 * Returns the number of page table pages actually used.
450 * Uses atomic kmaps of highmem pages to avoid TLB thrashing.
451 */
452static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
453 unsigned long num_data_pages,
454 struct vmw_piter *pt_iter)
455{
456 unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
457 unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
458 unsigned long pt_page;
459 u32 *addr, *save_addr;
460 unsigned long i;
461 struct page *page;
462
463 for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
464 page = vmw_piter_page(pt_iter);
465
466 save_addr = addr = kmap_atomic(page);
467
468 for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
469 vmw_mob_assign_ppn(&addr,
470 vmw_piter_dma_addr(data_iter));
471 if (unlikely(--num_data_pages == 0))
472 break;
473 WARN_ON(!vmw_piter_next(data_iter));
474 }
475 kunmap_atomic(save_addr);
476 vmw_piter_next(pt_iter);
477 }
478
479 return num_pt_pages;
480}
481
482/*
483 * vmw_mob_build_pt - Set up a multilevel mob pagetable
484 *
485 * @mob: Pointer to a mob whose page table needs setting up.
486 * @data_addr Array of DMA addresses to the buffer object's data
487 * pages.
488 * @num_data_pages: Number of buffer object data pages.
489 *
490 * Uses tail recursion to set up a multilevel mob page table.
491 */
492static void vmw_mob_pt_setup(struct vmw_mob *mob,
493 struct vmw_piter data_iter,
494 unsigned long num_data_pages)
495{
496 unsigned long num_pt_pages = 0;
497 struct ttm_buffer_object *bo = mob->pt_bo;
498 struct vmw_piter save_pt_iter = {0};
499 struct vmw_piter pt_iter;
500 const struct vmw_sg_table *vsgt;
501 int ret;
502
503 BUG_ON(num_data_pages == 0);
504
505 ret = ttm_bo_reserve(bo, false, true, NULL);
506 BUG_ON(ret != 0);
507
508 vsgt = vmw_bo_sg_table(bo);
509 vmw_piter_start(&pt_iter, vsgt, 0);
510 BUG_ON(!vmw_piter_next(&pt_iter));
511 mob->pt_level = 0;
512 while (likely(num_data_pages > 1)) {
513 ++mob->pt_level;
514 BUG_ON(mob->pt_level > 2);
515 save_pt_iter = pt_iter;
516 num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
517 &pt_iter);
518 data_iter = save_pt_iter;
519 num_data_pages = num_pt_pages;
520 }
521
522 mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
523 ttm_bo_unreserve(bo);
524}
525
526/*
527 * vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
528 *
529 * @mob: Pointer to a mob to destroy.
530 */
531void vmw_mob_destroy(struct vmw_mob *mob)
532{
533 if (mob->pt_bo) {
534 vmw_bo_unpin_unlocked(mob->pt_bo);
535 ttm_bo_put(mob->pt_bo);
536 mob->pt_bo = NULL;
537 }
538 kfree(mob);
539}
540
541/*
542 * vmw_mob_unbind - Hide a mob from the device.
543 *
544 * @dev_priv: Pointer to a device private.
545 * @mob_id: Device id of the mob to unbind.
546 */
547void vmw_mob_unbind(struct vmw_private *dev_priv,
548 struct vmw_mob *mob)
549{
550 struct {
551 SVGA3dCmdHeader header;
552 SVGA3dCmdDestroyGBMob body;
553 } *cmd;
554 int ret;
555 struct ttm_buffer_object *bo = mob->pt_bo;
556
557 if (bo) {
558 ret = ttm_bo_reserve(bo, false, true, NULL);
559 /*
560 * Noone else should be using this buffer.
561 */
562 BUG_ON(ret != 0);
563 }
564
565 cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
566 if (cmd) {
567 cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
568 cmd->header.size = sizeof(cmd->body);
569 cmd->body.mobid = mob->id;
570 vmw_cmd_commit(dev_priv, sizeof(*cmd));
571 }
572
573 if (bo) {
574 vmw_bo_fence_single(bo, NULL);
575 ttm_bo_unreserve(bo);
576 }
577 vmw_fifo_resource_dec(dev_priv);
578}
579
580/*
581 * vmw_mob_bind - Make a mob visible to the device after first
582 * populating it if necessary.
583 *
584 * @dev_priv: Pointer to a device private.
585 * @mob: Pointer to the mob we're making visible.
586 * @data_addr: Array of DMA addresses to the data pages of the underlying
587 * buffer object.
588 * @num_data_pages: Number of data pages of the underlying buffer
589 * object.
590 * @mob_id: Device id of the mob to bind
591 *
592 * This function is intended to be interfaced with the ttm_tt backend
593 * code.
594 */
595int vmw_mob_bind(struct vmw_private *dev_priv,
596 struct vmw_mob *mob,
597 const struct vmw_sg_table *vsgt,
598 unsigned long num_data_pages,
599 int32_t mob_id)
600{
601 int ret;
602 bool pt_set_up = false;
603 struct vmw_piter data_iter;
604 struct {
605 SVGA3dCmdHeader header;
606 SVGA3dCmdDefineGBMob64 body;
607 } *cmd;
608
609 mob->id = mob_id;
610 vmw_piter_start(&data_iter, vsgt, 0);
611 if (unlikely(!vmw_piter_next(&data_iter)))
612 return 0;
613
614 if (likely(num_data_pages == 1)) {
615 mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
616 mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
617 } else if (unlikely(mob->pt_bo == NULL)) {
618 ret = vmw_mob_pt_populate(dev_priv, mob);
619 if (unlikely(ret != 0))
620 return ret;
621
622 vmw_mob_pt_setup(mob, data_iter, num_data_pages);
623 pt_set_up = true;
624 mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PT_1;
625 }
626
627 vmw_fifo_resource_inc(dev_priv);
628
629 cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
630 if (unlikely(cmd == NULL))
631 goto out_no_cmd_space;
632
633 cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
634 cmd->header.size = sizeof(cmd->body);
635 cmd->body.mobid = mob_id;
636 cmd->body.ptDepth = mob->pt_level;
637 cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
638 cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
639
640 vmw_cmd_commit(dev_priv, sizeof(*cmd));
641
642 return 0;
643
644out_no_cmd_space:
645 vmw_fifo_resource_dec(dev_priv);
646 if (pt_set_up) {
647 vmw_bo_unpin_unlocked(mob->pt_bo);
648 ttm_bo_put(mob->pt_bo);
649 mob->pt_bo = NULL;
650 }
651
652 return -ENOMEM;
653}