xref: /dragonfly/sys/dev/drm/ttm/ttm_memory.c (revision 6ca88057) 
1 /**************************************************************************
2  *
3  * Copyright (c) 2006-2009 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  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_memory.c 248663 2013-03-23 20:46:47Z dumbbell $
27  **************************************************************************/
28 
29 #define pr_fmt(fmt) "[TTM] " fmt
30 
31 #include <drm/drmP.h>
32 #include <drm/ttm/ttm_memory.h>
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_page_alloc.h>
35 #include <linux/export.h>
36 
37 #define TTM_MEMORY_ALLOC_RETRIES 4
38 
39 struct ttm_mem_zone {
40 	u_int kobj_ref;
41 	struct ttm_mem_global *glob;
42 	const char *name;
43 	uint64_t zone_mem;
44 	uint64_t emer_mem;
45 	uint64_t max_mem;
46 	uint64_t swap_limit;
47 	uint64_t used_mem;
48 };
49 
50 static void ttm_mem_zone_kobj_release(struct ttm_mem_zone *zone)
51 {
52 
53 	pr_info("Zone %7s: Used memory at exit: %llu kiB\n",
54 		zone->name, (unsigned long long)zone->used_mem >> 10);
55 	drm_free(zone, M_DRM);
56 }
57 
58 #if 0
59 /* XXXKIB sysctl */
60 static ssize_t ttm_mem_zone_show(struct ttm_mem_zone *zone;
61 				 struct attribute *attr,
62 				 char *buffer)
63 {
64 	uint64_t val = 0;
65 
66 	mtx_lock(&zone->glob->lock);
67 	if (attr == &ttm_mem_sys)
68 		val = zone->zone_mem;
69 	else if (attr == &ttm_mem_emer)
70 		val = zone->emer_mem;
71 	else if (attr == &ttm_mem_max)
72 		val = zone->max_mem;
73 	else if (attr == &ttm_mem_swap)
74 		val = zone->swap_limit;
75 	else if (attr == &ttm_mem_used)
76 		val = zone->used_mem;
77 	mtx_unlock(&zone->glob->lock);
78 
79 	return snprintf(buffer, PAGE_SIZE, "%llu\n",
80 			(unsigned long long) val >> 10);
81 }
82 #endif
83 
84 static void ttm_check_swapping(struct ttm_mem_global *glob);
85 
86 #if 0
87 /* XXXKIB sysctl */
88 static ssize_t ttm_mem_zone_store(struct ttm_mem_zone *zone,
89 				  struct attribute *attr,
90 				  const char *buffer,
91 				  size_t size)
92 {
93 	int chars;
94 	unsigned long val;
95 	uint64_t val64;
96 
97 	chars = sscanf(buffer, "%lu", &val);
98 	if (chars == 0)
99 		return size;
100 
101 	val64 = val;
102 	val64 <<= 10;
103 
104 	mtx_lock(&zone->glob->lock);
105 	if (val64 > zone->zone_mem)
106 		val64 = zone->zone_mem;
107 	if (attr == &ttm_mem_emer) {
108 		zone->emer_mem = val64;
109 		if (zone->max_mem > val64)
110 			zone->max_mem = val64;
111 	} else if (attr == &ttm_mem_max) {
112 		zone->max_mem = val64;
113 		if (zone->emer_mem < val64)
114 			zone->emer_mem = val64;
115 	} else if (attr == &ttm_mem_swap)
116 		zone->swap_limit = val64;
117 	mtx_unlock(&zone->glob->lock);
118 
119 	ttm_check_swapping(zone->glob);
120 
121 	return size;
122 }
123 #endif
124 
125 static void ttm_mem_global_kobj_release(struct ttm_mem_global *glob)
126 {
127 }
128 
129 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
130 					bool from_wq, uint64_t extra)
131 {
132 	unsigned int i;
133 	struct ttm_mem_zone *zone;
134 	uint64_t target;
135 
136 	for (i = 0; i < glob->num_zones; ++i) {
137 		zone = glob->zones[i];
138 
139 		if (from_wq)
140 			target = zone->swap_limit;
141 		else if (priv_check(curthread, PRIV_VM_MLOCK) == 0)
142 			target = zone->emer_mem;
143 		else
144 			target = zone->max_mem;
145 
146 		target = (extra > target) ? 0ULL : target;
147 
148 		if (zone->used_mem > target)
149 			return true;
150 	}
151 	return false;
152 }
153 
154 /**
155  * At this point we only support a single shrink callback.
156  * Extend this if needed, perhaps using a linked list of callbacks.
157  * Note that this function is reentrant:
158  * many threads may try to swap out at any given time.
159  */
160 
161 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
162 		       uint64_t extra)
163 {
164 	int ret;
165 	struct ttm_mem_shrink *shrink;
166 
167 	spin_lock(&glob->spin);
168 	if (glob->shrink == NULL)
169 		goto out;
170 
171 	while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
172 		shrink = glob->shrink;
173 		spin_unlock(&glob->spin);
174 		ret = shrink->do_shrink(shrink);
175 		spin_lock(&glob->spin);
176 		if (unlikely(ret != 0))
177 			goto out;
178 	}
179 out:
180 	spin_unlock(&glob->spin);
181 }
182 
183 
184 
185 static void ttm_shrink_work(void *arg, int pending __unused)
186 {
187 	struct ttm_mem_global *glob = arg;
188 
189 	ttm_shrink(glob, true, 0ULL);
190 }
191 
192 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
193     uint64_t mem)
194 {
195 	struct ttm_mem_zone *zone;
196 
197 	zone = kmalloc(sizeof(*zone), M_DRM, M_WAITOK | M_ZERO);
198 
199 	zone->name = "kernel";
200 	zone->zone_mem = mem;
201 	zone->max_mem = mem >> 1;
202 	zone->emer_mem = (mem >> 1) + (mem >> 2);
203 	zone->swap_limit = zone->max_mem - (mem >> 3);
204 	zone->used_mem = 0;
205 	zone->glob = glob;
206 	glob->zone_kernel = zone;
207 	refcount_init(&zone->kobj_ref, 1);
208 	glob->zones[glob->num_zones++] = zone;
209 	return 0;
210 }
211 
212 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
213     uint64_t mem)
214 {
215 	struct ttm_mem_zone *zone;
216 
217 	zone = kmalloc(sizeof(*zone), M_DRM, M_WAITOK | M_ZERO);
218 
219 	/**
220 	 * No special dma32 zone needed.
221 	 */
222 
223 	if ((physmem * PAGE_SIZE) <= ((uint64_t) 1ULL << 32)) {
224 		drm_free(zone, M_DRM);
225 		return 0;
226 	}
227 
228 	/*
229 	 * Limit max dma32 memory to 4GB for now
230 	 * until we can figure out how big this
231 	 * zone really is.
232 	 */
233 	if (mem > ((uint64_t) 1ULL << 32))
234 		mem = ((uint64_t) 1ULL << 32);
235 
236 	zone->name = "dma32";
237 	zone->zone_mem = mem;
238 	zone->max_mem = mem >> 1;
239 	zone->emer_mem = (mem >> 1) + (mem >> 2);
240 	zone->swap_limit = zone->max_mem - (mem >> 3);
241 	zone->used_mem = 0;
242 	zone->glob = glob;
243 	glob->zone_dma32 = zone;
244 	refcount_init(&zone->kobj_ref, 1);
245 	glob->zones[glob->num_zones++] = zone;
246 	return 0;
247 }
248 
249 int ttm_mem_global_init(struct ttm_mem_global *glob)
250 {
251 	u_int64_t mem;
252 	int ret;
253 	int i;
254 	struct ttm_mem_zone *zone;
255 
256 	spin_init(&glob->spin, "ttmemglob");
257 	glob->swap_queue = taskqueue_create("ttm_swap", M_WAITOK,
258 	    taskqueue_thread_enqueue, &glob->swap_queue);
259 	taskqueue_start_threads(&glob->swap_queue, 1, 0, -1, "ttm swap");
260 	TASK_INIT(&glob->work, 0, ttm_shrink_work, glob);
261 
262 	refcount_init(&glob->kobj_ref, 1);
263 
264 	/*
265 	 * Managed contiguous memory for TTM.  Only use kernel-reserved
266 	 * dma memory for TTM, which can be controlled via /boot/loader.conf
267 	 * (e.g. vm.dma_reserved=256m).  This is the only truly dependable
268 	 * DMA memory.
269 	 */
270 	mem = (uint64_t)vm_contig_avail_pages() * PAGE_SIZE;
271 
272 	ret = ttm_mem_init_kernel_zone(glob, mem);
273 	if (unlikely(ret != 0))
274 		goto out_no_zone;
275 	ret = ttm_mem_init_dma32_zone(glob, mem);
276 	if (unlikely(ret != 0))
277 		goto out_no_zone;
278 	pr_info("(struct ttm_mem_global *)%p\n", glob);
279 	for (i = 0; i < glob->num_zones; ++i) {
280 		zone = glob->zones[i];
281 		pr_info("Zone %7s: Available graphics memory: %llu kiB\n",
282 			zone->name, (unsigned long long)zone->max_mem >> 10);
283 	}
284 	ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
285 	ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
286 	return 0;
287 out_no_zone:
288 	ttm_mem_global_release(glob);
289 	return ret;
290 }
291 EXPORT_SYMBOL(ttm_mem_global_init);
292 
293 void ttm_mem_global_release(struct ttm_mem_global *glob)
294 {
295 	unsigned int i;
296 	struct ttm_mem_zone *zone;
297 
298 	/* let the page allocator first stop the shrink work. */
299 	ttm_page_alloc_fini();
300 	ttm_dma_page_alloc_fini();
301 
302 	taskqueue_drain(glob->swap_queue, &glob->work);
303 	taskqueue_free(glob->swap_queue);
304 	glob->swap_queue = NULL;
305 	for (i = 0; i < glob->num_zones; ++i) {
306 		zone = glob->zones[i];
307 		if (refcount_release(&zone->kobj_ref))
308 			ttm_mem_zone_kobj_release(zone);
309 	}
310 	if (refcount_release(&glob->kobj_ref))
311 		ttm_mem_global_kobj_release(glob);
312 }
313 EXPORT_SYMBOL(ttm_mem_global_release);
314 
315 static void ttm_check_swapping(struct ttm_mem_global *glob)
316 {
317 	bool needs_swapping = false;
318 	unsigned int i;
319 	struct ttm_mem_zone *zone;
320 
321 	spin_lock(&glob->spin);
322 	for (i = 0; i < glob->num_zones; ++i) {
323 		zone = glob->zones[i];
324 		if (zone->used_mem > zone->swap_limit) {
325 			needs_swapping = true;
326 			break;
327 		}
328 	}
329 	spin_unlock(&glob->spin);
330 
331 	if (unlikely(needs_swapping))
332 		taskqueue_enqueue(glob->swap_queue, &glob->work);
333 
334 }
335 
336 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
337 				     struct ttm_mem_zone *single_zone,
338 				     uint64_t amount)
339 {
340 	unsigned int i;
341 	struct ttm_mem_zone *zone;
342 
343 	spin_lock(&glob->spin);
344 	for (i = 0; i < glob->num_zones; ++i) {
345 		zone = glob->zones[i];
346 		if (single_zone && zone != single_zone)
347 			continue;
348 		zone->used_mem -= amount;
349 	}
350 	spin_unlock(&glob->spin);
351 }
352 
353 void ttm_mem_global_free(struct ttm_mem_global *glob,
354 			 uint64_t amount)
355 {
356 	ttm_mem_global_free_zone(glob, NULL, amount);
357 }
358 EXPORT_SYMBOL(ttm_mem_global_free);
359 
360 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
361 				  struct ttm_mem_zone *single_zone,
362 				  uint64_t amount, bool reserve)
363 {
364 	uint64_t limit;
365 	int ret = -ENOMEM;
366 	unsigned int i;
367 	struct ttm_mem_zone *zone;
368 
369 	spin_lock(&glob->spin);
370 	for (i = 0; i < glob->num_zones; ++i) {
371 		zone = glob->zones[i];
372 		if (single_zone && zone != single_zone)
373 			continue;
374 
375 		limit = (priv_check(curthread, PRIV_VM_MLOCK) == 0) ?
376 			zone->emer_mem : zone->max_mem;
377 
378 		if (zone->used_mem > limit)
379 			goto out_unlock;
380 	}
381 
382 	if (reserve) {
383 		for (i = 0; i < glob->num_zones; ++i) {
384 			zone = glob->zones[i];
385 			if (single_zone && zone != single_zone)
386 				continue;
387 			zone->used_mem += amount;
388 		}
389 	}
390 
391 	ret = 0;
392 out_unlock:
393 	spin_unlock(&glob->spin);
394 	ttm_check_swapping(glob);
395 
396 	return ret;
397 }
398 
399 
400 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
401 				     struct ttm_mem_zone *single_zone,
402 				     uint64_t memory,
403 				     bool no_wait, bool interruptible)
404 {
405 	int count = TTM_MEMORY_ALLOC_RETRIES;
406 
407 	while (unlikely(ttm_mem_global_reserve(glob,
408 					       single_zone,
409 					       memory, true)
410 			!= 0)) {
411 		if (no_wait)
412 			return -ENOMEM;
413 		if (unlikely(count-- == 0))
414 			return -ENOMEM;
415 		ttm_shrink(glob, false, memory + (memory >> 2) + 16);
416 	}
417 
418 	return 0;
419 }
420 
421 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
422 			 bool no_wait, bool interruptible)
423 {
424 	/**
425 	 * Normal allocations of kernel memory are registered in
426 	 * all zones.
427 	 */
428 
429 	return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
430 					 interruptible);
431 }
432 EXPORT_SYMBOL(ttm_mem_global_alloc);
433 
434 #define page_to_pfn(pp) OFF_TO_IDX(VM_PAGE_TO_PHYS(pp))
435 
436 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
437 			      struct vm_page *page,
438 			      bool no_wait, bool interruptible)
439 {
440 
441 	struct ttm_mem_zone *zone = NULL;
442 
443 	/**
444 	 * Page allocations may be registed in a single zone
445 	 * only if highmem or !dma32.
446 	 */
447 
448 	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
449 		zone = glob->zone_kernel;
450 	return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
451 					 interruptible);
452 }
453 
454 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct vm_page *page)
455 {
456 	struct ttm_mem_zone *zone = NULL;
457 
458 	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
459 		zone = glob->zone_kernel;
460 	ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
461 }
462 
463 
464 size_t ttm_round_pot(size_t size)
465 {
466 	if ((size & (size - 1)) == 0)
467 		return size;
468 	else if (size > PAGE_SIZE)
469 		return PAGE_ALIGN(size);
470 	else {
471 		size_t tmp_size = 4;
472 
473 		while (tmp_size < size)
474 			tmp_size <<= 1;
475 
476 		return tmp_size;
477 	}
478 	return 0;
479 }
480 EXPORT_SYMBOL(ttm_round_pot);
481