xref: /dragonfly/sys/dev/drm/ttm/ttm_memory.c (revision 0db87cb7) 
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4  * All Rights Reserved.
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15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
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26  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_memory.c 248663 2013-03-23 20:46:47Z dumbbell $
27  **************************************************************************/
28 
29 #include <drm/drmP.h>
30 #include <drm/ttm/ttm_memory.h>
31 #include <drm/ttm/ttm_module.h>
32 #include <drm/ttm/ttm_page_alloc.h>
33 #include <linux/export.h>
34 
35 #define TTM_MEMORY_ALLOC_RETRIES 4
36 
37 struct ttm_mem_zone {
38 	u_int kobj_ref;
39 	struct ttm_mem_global *glob;
40 	const char *name;
41 	uint64_t zone_mem;
42 	uint64_t emer_mem;
43 	uint64_t max_mem;
44 	uint64_t swap_limit;
45 	uint64_t used_mem;
46 };
47 
48 static void ttm_mem_zone_kobj_release(struct ttm_mem_zone *zone)
49 {
50 
51 	kprintf("[TTM] Zone %7s: Used memory at exit: %llu kiB\n",
52 		zone->name, (unsigned long long)zone->used_mem >> 10);
53 	drm_free(zone, M_DRM);
54 }
55 
56 #if 0
57 /* XXXKIB sysctl */
58 static ssize_t ttm_mem_zone_show(struct ttm_mem_zone *zone;
59 				 struct attribute *attr,
60 				 char *buffer)
61 {
62 	uint64_t val = 0;
63 
64 	mtx_lock(&zone->glob->lock);
65 	if (attr == &ttm_mem_sys)
66 		val = zone->zone_mem;
67 	else if (attr == &ttm_mem_emer)
68 		val = zone->emer_mem;
69 	else if (attr == &ttm_mem_max)
70 		val = zone->max_mem;
71 	else if (attr == &ttm_mem_swap)
72 		val = zone->swap_limit;
73 	else if (attr == &ttm_mem_used)
74 		val = zone->used_mem;
75 	mtx_unlock(&zone->glob->lock);
76 
77 	return snprintf(buffer, PAGE_SIZE, "%llu\n",
78 			(unsigned long long) val >> 10);
79 }
80 #endif
81 
82 static void ttm_check_swapping(struct ttm_mem_global *glob);
83 
84 #if 0
85 /* XXXKIB sysctl */
86 static ssize_t ttm_mem_zone_store(struct ttm_mem_zone *zone,
87 				  struct attribute *attr,
88 				  const char *buffer,
89 				  size_t size)
90 {
91 	int chars;
92 	unsigned long val;
93 	uint64_t val64;
94 
95 	chars = sscanf(buffer, "%lu", &val);
96 	if (chars == 0)
97 		return size;
98 
99 	val64 = val;
100 	val64 <<= 10;
101 
102 	mtx_lock(&zone->glob->lock);
103 	if (val64 > zone->zone_mem)
104 		val64 = zone->zone_mem;
105 	if (attr == &ttm_mem_emer) {
106 		zone->emer_mem = val64;
107 		if (zone->max_mem > val64)
108 			zone->max_mem = val64;
109 	} else if (attr == &ttm_mem_max) {
110 		zone->max_mem = val64;
111 		if (zone->emer_mem < val64)
112 			zone->emer_mem = val64;
113 	} else if (attr == &ttm_mem_swap)
114 		zone->swap_limit = val64;
115 	mtx_unlock(&zone->glob->lock);
116 
117 	ttm_check_swapping(zone->glob);
118 
119 	return size;
120 }
121 #endif
122 
123 static void ttm_mem_global_kobj_release(struct ttm_mem_global *glob)
124 {
125 }
126 
127 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
128 					bool from_wq, uint64_t extra)
129 {
130 	unsigned int i;
131 	struct ttm_mem_zone *zone;
132 	uint64_t target;
133 
134 	for (i = 0; i < glob->num_zones; ++i) {
135 		zone = glob->zones[i];
136 
137 		if (from_wq)
138 			target = zone->swap_limit;
139 		else if (priv_check(curthread, PRIV_VM_MLOCK) == 0)
140 			target = zone->emer_mem;
141 		else
142 			target = zone->max_mem;
143 
144 		target = (extra > target) ? 0ULL : target;
145 
146 		if (zone->used_mem > target)
147 			return true;
148 	}
149 	return false;
150 }
151 
152 /**
153  * At this point we only support a single shrink callback.
154  * Extend this if needed, perhaps using a linked list of callbacks.
155  * Note that this function is reentrant:
156  * many threads may try to swap out at any given time.
157  */
158 
159 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
160 		       uint64_t extra)
161 {
162 	int ret;
163 	struct ttm_mem_shrink *shrink;
164 
165 	spin_lock(&glob->spin);
166 	if (glob->shrink == NULL)
167 		goto out;
168 
169 	while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
170 		shrink = glob->shrink;
171 		spin_unlock(&glob->spin);
172 		ret = shrink->do_shrink(shrink);
173 		spin_lock(&glob->spin);
174 		if (unlikely(ret != 0))
175 			goto out;
176 	}
177 out:
178 	spin_unlock(&glob->spin);
179 }
180 
181 
182 
183 static void ttm_shrink_work(void *arg, int pending __unused)
184 {
185 	struct ttm_mem_global *glob = arg;
186 
187 	ttm_shrink(glob, true, 0ULL);
188 }
189 
190 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
191     uint64_t mem)
192 {
193 	struct ttm_mem_zone *zone;
194 
195 	zone = kmalloc(sizeof(*zone), M_DRM, M_WAITOK | M_ZERO);
196 
197 	zone->name = "kernel";
198 	zone->zone_mem = mem;
199 	zone->max_mem = mem >> 1;
200 	zone->emer_mem = (mem >> 1) + (mem >> 2);
201 	zone->swap_limit = zone->max_mem - (mem >> 3);
202 	zone->used_mem = 0;
203 	zone->glob = glob;
204 	glob->zone_kernel = zone;
205 	refcount_init(&zone->kobj_ref, 1);
206 	glob->zones[glob->num_zones++] = zone;
207 	return 0;
208 }
209 
210 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
211     uint64_t mem)
212 {
213 	struct ttm_mem_zone *zone;
214 
215 	zone = kmalloc(sizeof(*zone), M_DRM, M_WAITOK | M_ZERO);
216 
217 	/**
218 	 * No special dma32 zone needed.
219 	 */
220 
221 	if ((physmem * PAGE_SIZE) <= ((uint64_t) 1ULL << 32)) {
222 		drm_free(zone, M_DRM);
223 		return 0;
224 	}
225 
226 	/*
227 	 * Limit max dma32 memory to 4GB for now
228 	 * until we can figure out how big this
229 	 * zone really is.
230 	 */
231 	if (mem > ((uint64_t) 1ULL << 32))
232 		mem = ((uint64_t) 1ULL << 32);
233 
234 	zone->name = "dma32";
235 	zone->zone_mem = mem;
236 	zone->max_mem = mem >> 1;
237 	zone->emer_mem = (mem >> 1) + (mem >> 2);
238 	zone->swap_limit = zone->max_mem - (mem >> 3);
239 	zone->used_mem = 0;
240 	zone->glob = glob;
241 	glob->zone_dma32 = zone;
242 	refcount_init(&zone->kobj_ref, 1);
243 	glob->zones[glob->num_zones++] = zone;
244 	return 0;
245 }
246 
247 int ttm_mem_global_init(struct ttm_mem_global *glob)
248 {
249 	u_int64_t mem;
250 	int ret;
251 	int i;
252 	struct ttm_mem_zone *zone;
253 
254 	spin_init(&glob->spin, "ttmemglob");
255 	glob->swap_queue = taskqueue_create("ttm_swap", M_WAITOK,
256 	    taskqueue_thread_enqueue, &glob->swap_queue);
257 	taskqueue_start_threads(&glob->swap_queue, 1, 0, -1, "ttm swap");
258 	TASK_INIT(&glob->work, 0, ttm_shrink_work, glob);
259 
260 	refcount_init(&glob->kobj_ref, 1);
261 
262 	/*
263 	 * Managed contiguous memory for TTM.  Only use kernel-reserved
264 	 * dma memory for TTM, which can be controlled via /boot/loader.conf
265 	 * (e.g. vm.dma_reserved=256m).  This is the only truly dependable
266 	 * DMA memory.
267 	 */
268 	mem = (uint64_t)vm_contig_avail_pages() * PAGE_SIZE;
269 
270 	ret = ttm_mem_init_kernel_zone(glob, mem);
271 	if (unlikely(ret != 0))
272 		goto out_no_zone;
273 	ret = ttm_mem_init_dma32_zone(glob, mem);
274 	if (unlikely(ret != 0))
275 		goto out_no_zone;
276 	kprintf("[TTM] (struct ttm_mem_global *)%p\n", glob);
277 	for (i = 0; i < glob->num_zones; ++i) {
278 		zone = glob->zones[i];
279 		kprintf("[TTM] Zone %7s: Available graphics memory: %llu kiB\n",
280 			zone->name, (unsigned long long)zone->max_mem >> 10);
281 	}
282 	ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
283 	ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
284 	return 0;
285 out_no_zone:
286 	ttm_mem_global_release(glob);
287 	return ret;
288 }
289 EXPORT_SYMBOL(ttm_mem_global_init);
290 
291 void ttm_mem_global_release(struct ttm_mem_global *glob)
292 {
293 	unsigned int i;
294 	struct ttm_mem_zone *zone;
295 
296 	/* let the page allocator first stop the shrink work. */
297 	ttm_page_alloc_fini();
298 	ttm_dma_page_alloc_fini();
299 
300 	taskqueue_drain(glob->swap_queue, &glob->work);
301 	taskqueue_free(glob->swap_queue);
302 	glob->swap_queue = NULL;
303 	for (i = 0; i < glob->num_zones; ++i) {
304 		zone = glob->zones[i];
305 		if (refcount_release(&zone->kobj_ref))
306 			ttm_mem_zone_kobj_release(zone);
307 	}
308 	if (refcount_release(&glob->kobj_ref))
309 		ttm_mem_global_kobj_release(glob);
310 }
311 EXPORT_SYMBOL(ttm_mem_global_release);
312 
313 static void ttm_check_swapping(struct ttm_mem_global *glob)
314 {
315 	bool needs_swapping = false;
316 	unsigned int i;
317 	struct ttm_mem_zone *zone;
318 
319 	spin_lock(&glob->spin);
320 	for (i = 0; i < glob->num_zones; ++i) {
321 		zone = glob->zones[i];
322 		if (zone->used_mem > zone->swap_limit) {
323 			needs_swapping = true;
324 			break;
325 		}
326 	}
327 	spin_unlock(&glob->spin);
328 
329 	if (unlikely(needs_swapping))
330 		taskqueue_enqueue(glob->swap_queue, &glob->work);
331 
332 }
333 
334 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
335 				     struct ttm_mem_zone *single_zone,
336 				     uint64_t amount)
337 {
338 	unsigned int i;
339 	struct ttm_mem_zone *zone;
340 
341 	spin_lock(&glob->spin);
342 	for (i = 0; i < glob->num_zones; ++i) {
343 		zone = glob->zones[i];
344 		if (single_zone && zone != single_zone)
345 			continue;
346 		zone->used_mem -= amount;
347 	}
348 	spin_unlock(&glob->spin);
349 }
350 
351 void ttm_mem_global_free(struct ttm_mem_global *glob,
352 			 uint64_t amount)
353 {
354 	ttm_mem_global_free_zone(glob, NULL, amount);
355 }
356 EXPORT_SYMBOL(ttm_mem_global_free);
357 
358 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
359 				  struct ttm_mem_zone *single_zone,
360 				  uint64_t amount, bool reserve)
361 {
362 	uint64_t limit;
363 	int ret = -ENOMEM;
364 	unsigned int i;
365 	struct ttm_mem_zone *zone;
366 
367 	spin_lock(&glob->spin);
368 	for (i = 0; i < glob->num_zones; ++i) {
369 		zone = glob->zones[i];
370 		if (single_zone && zone != single_zone)
371 			continue;
372 
373 		limit = (priv_check(curthread, PRIV_VM_MLOCK) == 0) ?
374 			zone->emer_mem : zone->max_mem;
375 
376 		if (zone->used_mem > limit)
377 			goto out_unlock;
378 	}
379 
380 	if (reserve) {
381 		for (i = 0; i < glob->num_zones; ++i) {
382 			zone = glob->zones[i];
383 			if (single_zone && zone != single_zone)
384 				continue;
385 			zone->used_mem += amount;
386 		}
387 	}
388 
389 	ret = 0;
390 out_unlock:
391 	spin_unlock(&glob->spin);
392 	ttm_check_swapping(glob);
393 
394 	return ret;
395 }
396 
397 
398 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
399 				     struct ttm_mem_zone *single_zone,
400 				     uint64_t memory,
401 				     bool no_wait, bool interruptible)
402 {
403 	int count = TTM_MEMORY_ALLOC_RETRIES;
404 
405 	while (unlikely(ttm_mem_global_reserve(glob,
406 					       single_zone,
407 					       memory, true)
408 			!= 0)) {
409 		if (no_wait)
410 			return -ENOMEM;
411 		if (unlikely(count-- == 0))
412 			return -ENOMEM;
413 		ttm_shrink(glob, false, memory + (memory >> 2) + 16);
414 	}
415 
416 	return 0;
417 }
418 
419 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
420 			 bool no_wait, bool interruptible)
421 {
422 	/**
423 	 * Normal allocations of kernel memory are registered in
424 	 * all zones.
425 	 */
426 
427 	return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
428 					 interruptible);
429 }
430 EXPORT_SYMBOL(ttm_mem_global_alloc);
431 
432 #define page_to_pfn(pp) OFF_TO_IDX(VM_PAGE_TO_PHYS(pp))
433 
434 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
435 			      struct vm_page *page,
436 			      bool no_wait, bool interruptible)
437 {
438 
439 	struct ttm_mem_zone *zone = NULL;
440 
441 	/**
442 	 * Page allocations may be registed in a single zone
443 	 * only if highmem or !dma32.
444 	 */
445 
446 	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
447 		zone = glob->zone_kernel;
448 	return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
449 					 interruptible);
450 }
451 
452 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct vm_page *page)
453 {
454 	struct ttm_mem_zone *zone = NULL;
455 
456 	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
457 		zone = glob->zone_kernel;
458 	ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
459 }
460 
461 
462 size_t ttm_round_pot(size_t size)
463 {
464 	if ((size & (size - 1)) == 0)
465 		return size;
466 	else if (size > PAGE_SIZE)
467 		return PAGE_ALIGN(size);
468 	else {
469 		size_t tmp_size = 4;
470 
471 		while (tmp_size < size)
472 			tmp_size <<= 1;
473 
474 		return tmp_size;
475 	}
476 	return 0;
477 }
478 EXPORT_SYMBOL(ttm_round_pot);
479