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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/drivers/gpu/drm/ttm/ttm_bo_vm.c
....@@ -42,8 +42,6 @@
4242 #include <linux/uaccess.h>
4343 #include <linux/mem_encrypt.h>
4444 
45
-#define TTM_BO_VM_NUM_PREFAULT 16
46
-
4745 static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
4846 				struct vm_fault *vmf)
4947 {
....@@ -60,18 +58,19 @@
6058 		goto out_clear;
6159 
6260 	/*
63
-	 * If possible, avoid waiting for GPU with mmap_sem
64
-	 * held.
61
+	 * If possible, avoid waiting for GPU with mmap_lock
62
+	 * held.  We only do this if the fault allows retry and this
63
+	 * is the first attempt.
6564 	 */
66
-	if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
65
+	if (fault_flag_allow_retry_first(vmf->flags)) {
6766 		ret = VM_FAULT_RETRY;
6867 		if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
6968 			goto out_unlock;
7069 
7170 		ttm_bo_get(bo);
72
-		up_read(&vmf->vma->vm_mm->mmap_sem);
71
+		mmap_read_unlock(vmf->vma->vm_mm);
7372 		(void) dma_fence_wait(bo->moving, true);
74
-		ttm_bo_unreserve(bo);
73
+		dma_resv_unlock(bo->base.resv);
7574 		ttm_bo_put(bo);
7675 		goto out_unlock;
7776 	}
....@@ -102,15 +101,175 @@
102101 	if (bdev->driver->io_mem_pfn)
103102 		return bdev->driver->io_mem_pfn(bo, page_offset);
104103 
105
-	return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT)
106
-		+ page_offset;
104
+	return (bo->mem.bus.offset >> PAGE_SHIFT) + page_offset;
107105 }
108106 
109
-static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
107
+/**
108
+ * ttm_bo_vm_reserve - Reserve a buffer object in a retryable vm callback
109
+ * @bo: The buffer object
110
+ * @vmf: The fault structure handed to the callback
111
+ *
112
+ * vm callbacks like fault() and *_mkwrite() allow for the mm_sem to be dropped
113
+ * during long waits, and after the wait the callback will be restarted. This
114
+ * is to allow other threads using the same virtual memory space concurrent
115
+ * access to map(), unmap() completely unrelated buffer objects. TTM buffer
116
+ * object reservations sometimes wait for GPU and should therefore be
117
+ * considered long waits. This function reserves the buffer object interruptibly
118
+ * taking this into account. Starvation is avoided by the vm system not
119
+ * allowing too many repeated restarts.
120
+ * This function is intended to be used in customized fault() and _mkwrite()
121
+ * handlers.
122
+ *
123
+ * Return:
124
+ *    0 on success and the bo was reserved.
125
+ *    VM_FAULT_RETRY if blocking wait.
126
+ *    VM_FAULT_NOPAGE if blocking wait and retrying was not allowed.
127
+ */
128
+vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
129
+			     struct vm_fault *vmf)
130
+{
131
+	/*
132
+	 * Work around locking order reversal in fault / nopfn
133
+	 * between mmap_lock and bo_reserve: Perform a trylock operation
134
+	 * for reserve, and if it fails, retry the fault after waiting
135
+	 * for the buffer to become unreserved.
136
+	 */
137
+	if (unlikely(!dma_resv_trylock(bo->base.resv))) {
138
+		/*
139
+		 * If the fault allows retry and this is the first
140
+		 * fault attempt, we try to release the mmap_lock
141
+		 * before waiting
142
+		 */
143
+		if (fault_flag_allow_retry_first(vmf->flags)) {
144
+			if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
145
+				ttm_bo_get(bo);
146
+				mmap_read_unlock(vmf->vma->vm_mm);
147
+				if (!dma_resv_lock_interruptible(bo->base.resv,
148
+								 NULL))
149
+					dma_resv_unlock(bo->base.resv);
150
+				ttm_bo_put(bo);
151
+			}
152
+
153
+			return VM_FAULT_RETRY;
154
+		}
155
+
156
+		if (dma_resv_lock_interruptible(bo->base.resv, NULL))
157
+			return VM_FAULT_NOPAGE;
158
+	}
159
+
160
+	return 0;
161
+}
162
+EXPORT_SYMBOL(ttm_bo_vm_reserve);
163
+
164
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
165
+/**
166
+ * ttm_bo_vm_insert_huge - Insert a pfn for PUD or PMD faults
167
+ * @vmf: Fault data
168
+ * @bo: The buffer object
169
+ * @page_offset: Page offset from bo start
170
+ * @fault_page_size: The size of the fault in pages.
171
+ * @pgprot: The page protections.
172
+ * Does additional checking whether it's possible to insert a PUD or PMD
173
+ * pfn and performs the insertion.
174
+ *
175
+ * Return: VM_FAULT_NOPAGE on successful insertion, VM_FAULT_FALLBACK if
176
+ * a huge fault was not possible, or on insertion error.
177
+ */
178
+static vm_fault_t ttm_bo_vm_insert_huge(struct vm_fault *vmf,
179
+					struct ttm_buffer_object *bo,
180
+					pgoff_t page_offset,
181
+					pgoff_t fault_page_size,
182
+					pgprot_t pgprot)
183
+{
184
+	pgoff_t i;
185
+	vm_fault_t ret;
186
+	unsigned long pfn;
187
+	pfn_t pfnt;
188
+	struct ttm_tt *ttm = bo->ttm;
189
+	bool write = vmf->flags & FAULT_FLAG_WRITE;
190
+
191
+	/* Fault should not cross bo boundary. */
192
+	page_offset &= ~(fault_page_size - 1);
193
+	if (page_offset + fault_page_size > bo->num_pages)
194
+		goto out_fallback;
195
+
196
+	if (bo->mem.bus.is_iomem)
197
+		pfn = ttm_bo_io_mem_pfn(bo, page_offset);
198
+	else
199
+		pfn = page_to_pfn(ttm->pages[page_offset]);
200
+
201
+	/* pfn must be fault_page_size aligned. */
202
+	if ((pfn & (fault_page_size - 1)) != 0)
203
+		goto out_fallback;
204
+
205
+	/* Check that memory is contiguous. */
206
+	if (!bo->mem.bus.is_iomem) {
207
+		for (i = 1; i < fault_page_size; ++i) {
208
+			if (page_to_pfn(ttm->pages[page_offset + i]) != pfn + i)
209
+				goto out_fallback;
210
+		}
211
+	} else if (bo->bdev->driver->io_mem_pfn) {
212
+		for (i = 1; i < fault_page_size; ++i) {
213
+			if (ttm_bo_io_mem_pfn(bo, page_offset + i) != pfn + i)
214
+				goto out_fallback;
215
+		}
216
+	}
217
+
218
+	pfnt = __pfn_to_pfn_t(pfn, PFN_DEV);
219
+	if (fault_page_size == (HPAGE_PMD_SIZE >> PAGE_SHIFT))
220
+		ret = vmf_insert_pfn_pmd_prot(vmf, pfnt, pgprot, write);
221
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
222
+	else if (fault_page_size == (HPAGE_PUD_SIZE >> PAGE_SHIFT))
223
+		ret = vmf_insert_pfn_pud_prot(vmf, pfnt, pgprot, write);
224
+#endif
225
+	else
226
+		WARN_ON_ONCE(ret = VM_FAULT_FALLBACK);
227
+
228
+	if (ret != VM_FAULT_NOPAGE)
229
+		goto out_fallback;
230
+
231
+	return VM_FAULT_NOPAGE;
232
+out_fallback:
233
+	count_vm_event(THP_FAULT_FALLBACK);
234
+	return VM_FAULT_FALLBACK;
235
+}
236
+#else
237
+static vm_fault_t ttm_bo_vm_insert_huge(struct vm_fault *vmf,
238
+					struct ttm_buffer_object *bo,
239
+					pgoff_t page_offset,
240
+					pgoff_t fault_page_size,
241
+					pgprot_t pgprot)
242
+{
243
+	return VM_FAULT_FALLBACK;
244
+}
245
+#endif
246
+
247
+/**
248
+ * ttm_bo_vm_fault_reserved - TTM fault helper
249
+ * @vmf: The struct vm_fault given as argument to the fault callback
250
+ * @prot: The page protection to be used for this memory area.
251
+ * @num_prefault: Maximum number of prefault pages. The caller may want to
252
+ * specify this based on madvice settings and the size of the GPU object
253
+ * backed by the memory.
254
+ * @fault_page_size: The size of the fault in pages.
255
+ *
256
+ * This function inserts one or more page table entries pointing to the
257
+ * memory backing the buffer object, and then returns a return code
258
+ * instructing the caller to retry the page access.
259
+ *
260
+ * Return:
261
+ *   VM_FAULT_NOPAGE on success or pending signal
262
+ *   VM_FAULT_SIGBUS on unspecified error
263
+ *   VM_FAULT_OOM on out-of-memory
264
+ *   VM_FAULT_RETRY if retryable wait
265
+ */
266
+vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
267
+				    pgprot_t prot,
268
+				    pgoff_t num_prefault,
269
+				    pgoff_t fault_page_size)
110270 {
111271 	struct vm_area_struct *vma = vmf->vma;
112
-	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
113
-	    vma->vm_private_data;
272
+	struct ttm_buffer_object *bo = vma->vm_private_data;
114273 	struct ttm_bo_device *bdev = bo->bdev;
115274 	unsigned long page_offset;
116275 	unsigned long page_last;
....@@ -118,65 +277,37 @@
118277 	struct ttm_tt *ttm = NULL;
119278 	struct page *page;
120279 	int err;
121
-	int i;
280
+	pgoff_t i;
122281 	vm_fault_t ret = VM_FAULT_NOPAGE;
123282 	unsigned long address = vmf->address;
124
-	struct ttm_mem_type_manager *man =
125
-		&bdev->man[bo->mem.mem_type];
126
-	struct vm_area_struct cvma;
127
-
128
-	/*
129
-	 * Work around locking order reversal in fault / nopfn
130
-	 * between mmap_sem and bo_reserve: Perform a trylock operation
131
-	 * for reserve, and if it fails, retry the fault after waiting
132
-	 * for the buffer to become unreserved.
133
-	 */
134
-	err = ttm_bo_reserve(bo, true, true, NULL);
135
-	if (unlikely(err != 0)) {
136
-		if (err != -EBUSY)
137
-			return VM_FAULT_NOPAGE;
138
-
139
-		if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
140
-			if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
141
-				ttm_bo_get(bo);
142
-				up_read(&vmf->vma->vm_mm->mmap_sem);
143
-				(void) ttm_bo_wait_unreserved(bo);
144
-				ttm_bo_put(bo);
145
-			}
146
-
147
-			return VM_FAULT_RETRY;
148
-		}
149
-
150
-		/*
151
-		 * If we'd want to change locking order to
152
-		 * mmap_sem -> bo::reserve, we'd use a blocking reserve here
153
-		 * instead of retrying the fault...
154
-		 */
155
-		return VM_FAULT_NOPAGE;
156
-	}
157283 
158284 	/*
159285 	 * Refuse to fault imported pages. This should be handled
160286 	 * (if at all) by redirecting mmap to the exporter.
161287 	 */
162
-	if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
163
-		ret = VM_FAULT_SIGBUS;
164
-		goto out_unlock;
165
-	}
288
+	if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
289
+		return VM_FAULT_SIGBUS;
166290 
167291 	if (bdev->driver->fault_reserve_notify) {
292
+		struct dma_fence *moving = dma_fence_get(bo->moving);
293
+
168294 		err = bdev->driver->fault_reserve_notify(bo);
169295 		switch (err) {
170296 		case 0:
171297 			break;
172298 		case -EBUSY:
173299 		case -ERESTARTSYS:
174
-			ret = VM_FAULT_NOPAGE;
175
-			goto out_unlock;
300
+			dma_fence_put(moving);
301
+			return VM_FAULT_NOPAGE;
176302 		default:
177
-			ret = VM_FAULT_SIGBUS;
178
-			goto out_unlock;
303
+			dma_fence_put(moving);
304
+			return VM_FAULT_SIGBUS;
179305 		}
306
+
307
+		if (bo->moving != moving) {
308
+			ttm_bo_move_to_lru_tail_unlocked(bo);
309
+		}
310
+		dma_fence_put(moving);
180311 	}
181312 
182313 	/*
....@@ -184,49 +315,23 @@
184315 	 * move.
185316 	 */
186317 	ret = ttm_bo_vm_fault_idle(bo, vmf);
187
-	if (unlikely(ret != 0)) {
188
-		if (ret == VM_FAULT_RETRY &&
189
-		    !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
190
-			/* The BO has already been unreserved. */
191
-			return ret;
192
-		}
318
+	if (unlikely(ret != 0))
319
+		return ret;
193320 
194
-		goto out_unlock;
195
-	}
196
-
197
-	err = ttm_mem_io_lock(man, true);
198
-	if (unlikely(err != 0)) {
199
-		ret = VM_FAULT_NOPAGE;
200
-		goto out_unlock;
201
-	}
202
-	err = ttm_mem_io_reserve_vm(bo);
203
-	if (unlikely(err != 0)) {
204
-		ret = VM_FAULT_SIGBUS;
205
-		goto out_io_unlock;
206
-	}
321
+	err = ttm_mem_io_reserve(bdev, &bo->mem);
322
+	if (unlikely(err != 0))
323
+		return VM_FAULT_SIGBUS;
207324 
208325 	page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
209
-		vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
326
+		vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node);
210327 	page_last = vma_pages(vma) + vma->vm_pgoff -
211
-		drm_vma_node_start(&bo->vma_node);
328
+		drm_vma_node_start(&bo->base.vma_node);
212329 
213
-	if (unlikely(page_offset >= bo->num_pages)) {
214
-		ret = VM_FAULT_SIGBUS;
215
-		goto out_io_unlock;
216
-	}
330
+	if (unlikely(page_offset >= bo->num_pages))
331
+		return VM_FAULT_SIGBUS;
217332 
218
-	/*
219
-	 * Make a local vma copy to modify the page_prot member
220
-	 * and vm_flags if necessary. The vma parameter is protected
221
-	 * by mmap_sem in write mode.
222
-	 */
223
-	cvma = *vma;
224
-	cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
225
-
226
-	if (bo->mem.bus.is_iomem) {
227
-		cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
228
-						cvma.vm_page_prot);
229
-	} else {
333
+	prot = ttm_io_prot(bo->mem.placement, prot);
334
+	if (!bo->mem.bus.is_iomem) {
230335 		struct ttm_operation_ctx ctx = {
231336 			.interruptible = false,
232337 			.no_wait_gpu = false,
....@@ -235,48 +340,56 @@
235340 		};
236341 
237342 		ttm = bo->ttm;
238
-		cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
239
-						cvma.vm_page_prot);
240
-
241
-		/* Allocate all page at once, most common usage */
242
-		if (ttm_tt_populate(ttm, &ctx)) {
243
-			ret = VM_FAULT_OOM;
244
-			goto out_io_unlock;
245
-		}
343
+		if (ttm_tt_populate(bdev, bo->ttm, &ctx))
344
+			return VM_FAULT_OOM;
345
+	} else {
346
+		/* Iomem should not be marked encrypted */
347
+		prot = pgprot_decrypted(prot);
246348 	}
349
+
350
+	/* We don't prefault on huge faults. Yet. */
351
+	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && fault_page_size != 1)
352
+		return ttm_bo_vm_insert_huge(vmf, bo, page_offset,
353
+					     fault_page_size, prot);
247354 
248355 	/*
249356 	 * Speculatively prefault a number of pages. Only error on
250357 	 * first page.
251358 	 */
252
-	for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
359
+	for (i = 0; i < num_prefault; ++i) {
253360 		if (bo->mem.bus.is_iomem) {
254
-			/* Iomem should not be marked encrypted */
255
-			cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
256361 			pfn = ttm_bo_io_mem_pfn(bo, page_offset);
257362 		} else {
258363 			page = ttm->pages[page_offset];
259364 			if (unlikely(!page && i == 0)) {
260
-				ret = VM_FAULT_OOM;
261
-				goto out_io_unlock;
365
+				return VM_FAULT_OOM;
262366 			} else if (unlikely(!page)) {
263367 				break;
264368 			}
265
-			page->index = drm_vma_node_start(&bo->vma_node) +
369
+			page->index = drm_vma_node_start(&bo->base.vma_node) +
266370 				page_offset;
267371 			pfn = page_to_pfn(page);
268372 		}
269373 
374
+		/*
375
+		 * Note that the value of @prot at this point may differ from
376
+		 * the value of @vma->vm_page_prot in the caching- and
377
+		 * encryption bits. This is because the exact location of the
378
+		 * data may not be known at mmap() time and may also change
379
+		 * at arbitrary times while the data is mmap'ed.
380
+		 * See vmf_insert_mixed_prot() for a discussion.
381
+		 */
270382 		if (vma->vm_flags & VM_MIXEDMAP)
271
-			ret = vmf_insert_mixed(&cvma, address,
272
-					__pfn_to_pfn_t(pfn, PFN_DEV));
383
+			ret = vmf_insert_mixed_prot(vma, address,
384
+						    __pfn_to_pfn_t(pfn, PFN_DEV),
385
+						    prot);
273386 		else
274
-			ret = vmf_insert_pfn(&cvma, address, pfn);
387
+			ret = vmf_insert_pfn_prot(vma, address, pfn, prot);
275388 
276389 		/* Never error on prefaulted PTEs */
277390 		if (unlikely((ret & VM_FAULT_ERROR))) {
278391 			if (i == 0)
279
-				goto out_io_unlock;
392
+				return VM_FAULT_NOPAGE;
280393 			else
281394 				break;
282395 		}
....@@ -285,31 +398,50 @@
285398 		if (unlikely(++page_offset >= page_last))
286399 			break;
287400 	}
288
-	ret = VM_FAULT_NOPAGE;
289
-out_io_unlock:
290
-	ttm_mem_io_unlock(man);
291
-out_unlock:
292
-	ttm_bo_unreserve(bo);
293401 	return ret;
294402 }
403
+EXPORT_SYMBOL(ttm_bo_vm_fault_reserved);
295404 
296
-static void ttm_bo_vm_open(struct vm_area_struct *vma)
405
+vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
297406 {
298
-	struct ttm_buffer_object *bo =
299
-	    (struct ttm_buffer_object *)vma->vm_private_data;
407
+	struct vm_area_struct *vma = vmf->vma;
408
+	pgprot_t prot;
409
+	struct ttm_buffer_object *bo = vma->vm_private_data;
410
+	vm_fault_t ret;
411
+
412
+	ret = ttm_bo_vm_reserve(bo, vmf);
413
+	if (ret)
414
+		return ret;
415
+
416
+	prot = vma->vm_page_prot;
417
+	ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
418
+	if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
419
+		return ret;
420
+
421
+	dma_resv_unlock(bo->base.resv);
422
+
423
+	return ret;
424
+}
425
+EXPORT_SYMBOL(ttm_bo_vm_fault);
426
+
427
+void ttm_bo_vm_open(struct vm_area_struct *vma)
428
+{
429
+	struct ttm_buffer_object *bo = vma->vm_private_data;
300430 
301431 	WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
302432 
303433 	ttm_bo_get(bo);
304434 }
435
+EXPORT_SYMBOL(ttm_bo_vm_open);
305436 
306
-static void ttm_bo_vm_close(struct vm_area_struct *vma)
437
+void ttm_bo_vm_close(struct vm_area_struct *vma)
307438 {
308
-	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
439
+	struct ttm_buffer_object *bo = vma->vm_private_data;
309440 
310441 	ttm_bo_put(bo);
311442 	vma->vm_private_data = NULL;
312443 }
444
+EXPORT_SYMBOL(ttm_bo_vm_close);
313445 
314446 static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
315447 				 unsigned long offset,
....@@ -350,11 +482,13 @@
350482 	return len;
351483 }
352484 
353
-static int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
354
-			    void *buf, int len, int write)
485
+int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
486
+		     void *buf, int len, int write)
355487 {
356
-	unsigned long offset = (addr) - vma->vm_start;
357488 	struct ttm_buffer_object *bo = vma->vm_private_data;
489
+	unsigned long offset = (addr) - vma->vm_start +
490
+		((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node))
491
+		 << PAGE_SHIFT);
358492 	int ret;
359493 
360494 	if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
....@@ -366,12 +500,7 @@
366500 
367501 	switch (bo->mem.mem_type) {
368502 	case TTM_PL_SYSTEM:
369
-		if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
370
-			ret = ttm_tt_swapin(bo->ttm);
371
-			if (unlikely(ret != 0))
372
-				return ret;
373
-		}
374
-		/* fall through */
503
+		fallthrough;
375504 	case TTM_PL_TT:
376505 		ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
377506 		break;
....@@ -387,12 +516,13 @@
387516 
388517 	return ret;
389518 }
519
+EXPORT_SYMBOL(ttm_bo_vm_access);
390520 
391521 static const struct vm_operations_struct ttm_bo_vm_ops = {
392522 	.fault = ttm_bo_vm_fault,
393523 	.open = ttm_bo_vm_open,
394524 	.close = ttm_bo_vm_close,
395
-	.access = ttm_bo_vm_access
525
+	.access = ttm_bo_vm_access,
396526 };
397527 
398528 static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
....@@ -402,16 +532,16 @@
402532 	struct drm_vma_offset_node *node;
403533 	struct ttm_buffer_object *bo = NULL;
404534 
405
-	drm_vma_offset_lock_lookup(&bdev->vma_manager);
535
+	drm_vma_offset_lock_lookup(bdev->vma_manager);
406536 
407
-	node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
537
+	node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
408538 	if (likely(node)) {
409
-		bo = container_of(node, struct ttm_buffer_object, vma_node);
410
-		if (!kref_get_unless_zero(&bo->kref))
411
-			bo = NULL;
539
+		bo = container_of(node, struct ttm_buffer_object,
540
+				  base.vma_node);
541
+		bo = ttm_bo_get_unless_zero(bo);
412542 	}
413543 
414
-	drm_vma_offset_unlock_lookup(&bdev->vma_manager);
544
+	drm_vma_offset_unlock_lookup(bdev->vma_manager);
415545 
416546 	if (!bo)
417547 		pr_err("Could not find buffer object to map\n");
....@@ -419,26 +549,8 @@
419549 	return bo;
420550 }
421551 
422
-int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
423
-		struct ttm_bo_device *bdev)
552
+static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object *bo, struct vm_area_struct *vma)
424553 {
425
-	struct ttm_bo_driver *driver;
426
-	struct ttm_buffer_object *bo;
427
-	int ret;
428
-
429
-	bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
430
-	if (unlikely(!bo))
431
-		return -EINVAL;
432
-
433
-	driver = bo->bdev->driver;
434
-	if (unlikely(!driver->verify_access)) {
435
-		ret = -EPERM;
436
-		goto out_unref;
437
-	}
438
-	ret = driver->verify_access(bo, filp);
439
-	if (unlikely(ret != 0))
440
-		goto out_unref;
441
-
442554 	vma->vm_ops = &ttm_bo_vm_ops;
443555 
444556 	/*
....@@ -457,6 +569,32 @@
457569 	 */
458570 	vma->vm_flags |= VM_MIXEDMAP;
459571 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
572
+}
573
+
574
+int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
575
+		struct ttm_bo_device *bdev)
576
+{
577
+	struct ttm_bo_driver *driver;
578
+	struct ttm_buffer_object *bo;
579
+	int ret;
580
+
581
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
582
+		return -EINVAL;
583
+
584
+	bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
585
+	if (unlikely(!bo))
586
+		return -EINVAL;
587
+
588
+	driver = bo->bdev->driver;
589
+	if (unlikely(!driver->verify_access)) {
590
+		ret = -EPERM;
591
+		goto out_unref;
592
+	}
593
+	ret = driver->verify_access(bo, filp);
594
+	if (unlikely(ret != 0))
595
+		goto out_unref;
596
+
597
+	ttm_bo_mmap_vma_setup(bo, vma);
460598 	return 0;
461599 out_unref:
462600 	ttm_bo_put(bo);
....@@ -464,17 +602,10 @@
464602 }
465603 EXPORT_SYMBOL(ttm_bo_mmap);
466604 
467
-int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
605
+int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
468606 {
469
-	if (vma->vm_pgoff != 0)
470
-		return -EACCES;
471
-
472607 	ttm_bo_get(bo);
473
-
474
-	vma->vm_ops = &ttm_bo_vm_ops;
475
-	vma->vm_private_data = bo;
476
-	vma->vm_flags |= VM_MIXEDMAP;
477
-	vma->vm_flags |= VM_IO | VM_DONTEXPAND;
608
+	ttm_bo_mmap_vma_setup(bo, vma);
478609 	return 0;
479610 }
480
-EXPORT_SYMBOL(ttm_fbdev_mmap);
611
+EXPORT_SYMBOL(ttm_bo_mmap_obj);