Bug Summary

File:dev/pci/drm/ttm/ttm_memory.c
Warning:line 448, column 3
Value stored to 'zone' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ttm_memory.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -ffreestanding -mcmodel=kernel -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -target-feature -sse2 -target-feature -sse -target-feature -3dnow -target-feature -mmx -target-feature +save-args -disable-red-zone -no-implicit-float -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -nostdsysteminc -nobuiltininc -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/sys -I /usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -I /usr/src/sys/arch -I /usr/src/sys/dev/pci/drm/include -I /usr/src/sys/dev/pci/drm/include/uapi -I /usr/src/sys/dev/pci/drm/amd/include/asic_reg -I /usr/src/sys/dev/pci/drm/amd/include -I /usr/src/sys/dev/pci/drm/amd/amdgpu -I /usr/src/sys/dev/pci/drm/amd/display -I /usr/src/sys/dev/pci/drm/amd/display/include -I /usr/src/sys/dev/pci/drm/amd/display/dc -I /usr/src/sys/dev/pci/drm/amd/display/amdgpu_dm -I /usr/src/sys/dev/pci/drm/amd/pm/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu11 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu12 -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/hwmgr -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/smumgr -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc/hw -I /usr/src/sys/dev/pci/drm/amd/display/dc/clk_mgr -I /usr/src/sys/dev/pci/drm/amd/display/modules/inc -I /usr/src/sys/dev/pci/drm/amd/display/modules/hdcp -I /usr/src/sys/dev/pci/drm/amd/display/dmub/inc -I /usr/src/sys/dev/pci/drm/i915 -D DDB -D DIAGNOSTIC -D KTRACE -D ACCOUNTING -D KMEMSTATS -D PTRACE -D POOL_DEBUG -D CRYPTO -D SYSVMSG -D SYSVSEM -D SYSVSHM -D UVM_SWAP_ENCRYPT -D FFS -D FFS2 -D FFS_SOFTUPDATES -D UFS_DIRHASH -D QUOTA -D EXT2FS -D MFS -D NFSCLIENT -D NFSSERVER -D CD9660 -D UDF -D MSDOSFS -D FIFO -D FUSE -D SOCKET_SPLICE -D TCP_ECN -D TCP_SIGNATURE -D INET6 -D IPSEC -D PPP_BSDCOMP -D PPP_DEFLATE -D PIPEX -D MROUTING -D MPLS -D BOOT_CONFIG -D USER_PCICONF -D APERTURE -D MTRR -D NTFS -D HIBERNATE -D PCIVERBOSE -D USBVERBOSE -D WSDISPLAY_COMPAT_USL -D WSDISPLAY_COMPAT_RAWKBD -D WSDISPLAY_DEFAULTSCREENS=6 -D X86EMU -D ONEWIREVERBOSE -D MULTIPROCESSOR -D MAXUSERS=80 -D _KERNEL -D CONFIG_DRM_AMD_DC_DCN3_0 -O2 -Wno-pointer-sign -Wno-address-of-packed-member -Wno-constant-conversion -Wno-unused-but-set-variable -Wno-gnu-folding-constant -fdebug-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -o /usr/obj/sys/arch/amd64/compile/GENERIC.MP/scan-build/2022-01-12-131800-47421-1 -x c /usr/src/sys/dev/pci/drm/ttm/ttm_memory.c
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29#define pr_fmt(fmt)"[TTM] " fmt "[TTM] " fmt
30
31#include <drm/ttm/ttm_memory.h>
32#include <drm/ttm/ttm_module.h>
33#include <drm/ttm/ttm_page_alloc.h>
34#include <linux/spinlock.h>
35#include <linux/sched.h>
36#include <linux/wait.h>
37#include <linux/mm.h>
38#include <linux/module.h>
39#include <linux/slab.h>
40#include <linux/swap.h>
41
42#define TTM_MEMORY_ALLOC_RETRIES4 4
43
44struct ttm_mem_global ttm_mem_glob;
45EXPORT_SYMBOL(ttm_mem_glob);
46
47struct ttm_mem_zone {
48 struct kobject kobj;
49 struct ttm_mem_global *glob;
50 const char *name;
51 uint64_t zone_mem;
52 uint64_t emer_mem;
53 uint64_t max_mem;
54 uint64_t swap_limit;
55 uint64_t used_mem;
56};
57
58#ifdef notyet
59static struct attribute ttm_mem_sys = {
60 .name = "zone_memory",
61 .mode = S_IRUGO
62};
63static struct attribute ttm_mem_emer = {
64 .name = "emergency_memory",
65 .mode = S_IRUGO | S_IWUSR
66};
67static struct attribute ttm_mem_max = {
68 .name = "available_memory",
69 .mode = S_IRUGO | S_IWUSR
70};
71static struct attribute ttm_mem_swap = {
72 .name = "swap_limit",
73 .mode = S_IRUGO | S_IWUSR
74};
75static struct attribute ttm_mem_used = {
76 .name = "used_memory",
77 .mode = S_IRUGO
78};
79#endif
80
81static void ttm_mem_zone_kobj_release(struct kobject *kobj)
82{
83 struct ttm_mem_zone *zone =
84 container_of(kobj, struct ttm_mem_zone, kobj)({ const __typeof( ((struct ttm_mem_zone *)0)->kobj ) *__mptr
= (kobj); (struct ttm_mem_zone *)( (char *)__mptr - __builtin_offsetof
(struct ttm_mem_zone, kobj) );});
85
86 pr_info("Zone %7s: Used memory at exit: %llu KiB\n",do { } while(0)
87 zone->name, (unsigned long long)zone->used_mem >> 10)do { } while(0);
88 kfree(zone);
89}
90
91#ifdef notyet
92static ssize_t ttm_mem_zone_show(struct kobject *kobj,
93 struct attribute *attr,
94 char *buffer)
95{
96 struct ttm_mem_zone *zone =
97 container_of(kobj, struct ttm_mem_zone, kobj)({ const __typeof( ((struct ttm_mem_zone *)0)->kobj ) *__mptr
= (kobj); (struct ttm_mem_zone *)( (char *)__mptr - __builtin_offsetof
(struct ttm_mem_zone, kobj) );});
98 uint64_t val = 0;
99
100 spin_lock(&zone->glob->lock)mtx_enter(&zone->glob->lock);
101 if (attr == &ttm_mem_sys)
102 val = zone->zone_mem;
103 else if (attr == &ttm_mem_emer)
104 val = zone->emer_mem;
105 else if (attr == &ttm_mem_max)
106 val = zone->max_mem;
107 else if (attr == &ttm_mem_swap)
108 val = zone->swap_limit;
109 else if (attr == &ttm_mem_used)
110 val = zone->used_mem;
111 spin_unlock(&zone->glob->lock)mtx_leave(&zone->glob->lock);
112
113 return snprintf(buffer, PAGE_SIZE(1 << 12), "%llu\n",
114 (unsigned long long) val >> 10);
115}
116
117static void ttm_check_swapping(struct ttm_mem_global *glob);
118
119static ssize_t ttm_mem_zone_store(struct kobject *kobj,
120 struct attribute *attr,
121 const char *buffer,
122 size_t size)
123{
124 struct ttm_mem_zone *zone =
125 container_of(kobj, struct ttm_mem_zone, kobj)({ const __typeof( ((struct ttm_mem_zone *)0)->kobj ) *__mptr
= (kobj); (struct ttm_mem_zone *)( (char *)__mptr - __builtin_offsetof
(struct ttm_mem_zone, kobj) );});
126 int chars;
127 unsigned long val;
128 uint64_t val64;
129
130 chars = sscanf(buffer, "%lu", &val);
131 if (chars == 0)
132 return size;
133
134 val64 = val;
135 val64 <<= 10;
136
137 spin_lock(&zone->glob->lock)mtx_enter(&zone->glob->lock);
138 if (val64 > zone->zone_mem)
139 val64 = zone->zone_mem;
140 if (attr == &ttm_mem_emer) {
141 zone->emer_mem = val64;
142 if (zone->max_mem > val64)
143 zone->max_mem = val64;
144 } else if (attr == &ttm_mem_max) {
145 zone->max_mem = val64;
146 if (zone->emer_mem < val64)
147 zone->emer_mem = val64;
148 } else if (attr == &ttm_mem_swap)
149 zone->swap_limit = val64;
150 spin_unlock(&zone->glob->lock)mtx_leave(&zone->glob->lock);
151
152 ttm_check_swapping(zone->glob);
153
154 return size;
155}
156
157static struct attribute *ttm_mem_zone_attrs[] = {
158 &ttm_mem_sys,
159 &ttm_mem_emer,
160 &ttm_mem_max,
161 &ttm_mem_swap,
162 &ttm_mem_used,
163 NULL((void *)0)
164};
165
166static const struct sysfs_ops ttm_mem_zone_ops = {
167 .show = &ttm_mem_zone_show,
168 .store = &ttm_mem_zone_store
169};
170#endif
171
172static struct kobj_type ttm_mem_zone_kobj_type = {
173 .release = &ttm_mem_zone_kobj_release,
174#ifdef __linux__
175 .sysfs_ops = &ttm_mem_zone_ops,
176 .default_attrs = ttm_mem_zone_attrs,
177#endif
178};
179
180#ifdef notyet
181static struct attribute ttm_mem_global_lower_mem_limit = {
182 .name = "lower_mem_limit",
183 .mode = S_IRUGO | S_IWUSR
184};
185
186static ssize_t ttm_mem_global_show(struct kobject *kobj,
187 struct attribute *attr,
188 char *buffer)
189{
190 struct ttm_mem_global *glob =
191 container_of(kobj, struct ttm_mem_global, kobj)({ const __typeof( ((struct ttm_mem_global *)0)->kobj ) *__mptr
= (kobj); (struct ttm_mem_global *)( (char *)__mptr - __builtin_offsetof
(struct ttm_mem_global, kobj) );});
192 uint64_t val = 0;
193
194 spin_lock(&glob->lock)mtx_enter(&glob->lock);
195 val = glob->lower_mem_limit;
196 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
197 /* convert from number of pages to KB */
198 val <<= (PAGE_SHIFT12 - 10);
199 return snprintf(buffer, PAGE_SIZE(1 << 12), "%llu\n",
200 (unsigned long long) val);
201}
202
203static ssize_t ttm_mem_global_store(struct kobject *kobj,
204 struct attribute *attr,
205 const char *buffer,
206 size_t size)
207{
208 int chars;
209 uint64_t val64;
210 unsigned long val;
211 struct ttm_mem_global *glob =
212 container_of(kobj, struct ttm_mem_global, kobj)({ const __typeof( ((struct ttm_mem_global *)0)->kobj ) *__mptr
= (kobj); (struct ttm_mem_global *)( (char *)__mptr - __builtin_offsetof
(struct ttm_mem_global, kobj) );});
213
214 chars = sscanf(buffer, "%lu", &val);
215 if (chars == 0)
216 return size;
217
218 val64 = val;
219 /* convert from KB to number of pages */
220 val64 >>= (PAGE_SHIFT12 - 10);
221
222 spin_lock(&glob->lock)mtx_enter(&glob->lock);
223 glob->lower_mem_limit = val64;
224 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
225
226 return size;
227}
228
229static struct attribute *ttm_mem_global_attrs[] = {
230 &ttm_mem_global_lower_mem_limit,
231 NULL((void *)0)
232};
233
234static const struct sysfs_ops ttm_mem_global_ops = {
235 .show = &ttm_mem_global_show,
236 .store = &ttm_mem_global_store,
237};
238#endif /* notyet */
239
240static struct kobj_type ttm_mem_glob_kobj_type = {
241#ifdef __linux__
242 .sysfs_ops = &ttm_mem_global_ops,
243 .default_attrs = ttm_mem_global_attrs,
244#endif
245};
246
247static bool_Bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
248 bool_Bool from_wq, uint64_t extra)
249{
250 unsigned int i;
251 struct ttm_mem_zone *zone;
252 uint64_t target;
253
254 for (i = 0; i < glob->num_zones; ++i) {
255 zone = glob->zones[i];
256
257 if (from_wq)
258 target = zone->swap_limit;
259 else if (capable(CAP_SYS_ADMIN0x1))
260 target = zone->emer_mem;
261 else
262 target = zone->max_mem;
263
264 target = (extra > target) ? 0ULL : target;
265
266 if (zone->used_mem > target)
267 return true1;
268 }
269 return false0;
270}
271
272/*
273 * At this point we only support a single shrink callback.
274 * Extend this if needed, perhaps using a linked list of callbacks.
275 * Note that this function is reentrant:
276 * many threads may try to swap out at any given time.
277 */
278
279static void ttm_shrink(struct ttm_mem_global *glob, bool_Bool from_wq,
280 uint64_t extra, struct ttm_operation_ctx *ctx)
281{
282 int ret;
283
284 spin_lock(&glob->lock)mtx_enter(&glob->lock);
285
286 while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
287 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
288 ret = ttm_bo_swapout(&ttm_bo_glob, ctx);
289 spin_lock(&glob->lock)mtx_enter(&glob->lock);
290 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0))
291 break;
292 }
293
294 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
295}
296
297static void ttm_shrink_work(struct work_struct *work)
298{
299 struct ttm_operation_ctx ctx = {
300 .interruptible = false0,
301 .no_wait_gpu = false0
302 };
303 struct ttm_mem_global *glob =
304 container_of(work, struct ttm_mem_global, work)({ const __typeof( ((struct ttm_mem_global *)0)->work ) *__mptr
= (work); (struct ttm_mem_global *)( (char *)__mptr - __builtin_offsetof
(struct ttm_mem_global, work) );});
305
306 ttm_shrink(glob, true1, 0ULL, &ctx);
307}
308
309static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
310 uint64_t mem)
311{
312 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL(0x0001 | 0x0004));
313 int ret;
314
315 if (unlikely(!zone)__builtin_expect(!!(!zone), 0))
316 return -ENOMEM12;
317
318 zone->name = "kernel";
319 zone->zone_mem = mem;
320 zone->max_mem = mem >> 1;
321 zone->emer_mem = (mem >> 1) + (mem >> 2);
322 zone->swap_limit = zone->max_mem - (mem >> 3);
323 zone->used_mem = 0;
324 zone->glob = glob;
325 glob->zone_kernel = zone;
326 ret = kobject_init_and_add(
327 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
328 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0)) {
329 kobject_put(&zone->kobj);
330 return ret;
331 }
332 glob->zones[glob->num_zones++] = zone;
333 return 0;
334}
335
336#ifdef CONFIG_HIGHMEM
337static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
338 uint64_t mem)
339{
340 struct ttm_mem_zone *zone;
341 int ret;
342
343 if (si->totalhigh == 0)
344 return 0;
345
346 zone = kzalloc(sizeof(*zone), GFP_KERNEL(0x0001 | 0x0004));
347 if (unlikely(!zone)__builtin_expect(!!(!zone), 0))
348 return -ENOMEM12;
349
350 zone->name = "highmem";
351 zone->zone_mem = mem;
352 zone->max_mem = mem >> 1;
353 zone->emer_mem = (mem >> 1) + (mem >> 2);
354 zone->swap_limit = zone->max_mem - (mem >> 3);
355 zone->used_mem = 0;
356 zone->glob = glob;
357 glob->zone_highmem = zone;
358 ret = kobject_init_and_add(
359 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
360 zone->name);
361 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0)) {
362 kobject_put(&zone->kobj);
363 return ret;
364 }
365 glob->zones[glob->num_zones++] = zone;
366 return 0;
367}
368#else
369static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
370 uint64_t mem)
371{
372 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL(0x0001 | 0x0004));
373 int ret;
374
375 if (unlikely(!zone)__builtin_expect(!!(!zone), 0))
376 return -ENOMEM12;
377
378 /**
379 * No special dma32 zone needed.
380 */
381
382 if (mem <= ((uint64_t) 1ULL << 32)) {
383 kfree(zone);
384 return 0;
385 }
386
387 /*
388 * Limit max dma32 memory to 4GB for now
389 * until we can figure out how big this
390 * zone really is.
391 */
392
393 mem = ((uint64_t) 1ULL << 32);
394 zone->name = "dma32";
395 zone->zone_mem = mem;
396 zone->max_mem = mem >> 1;
397 zone->emer_mem = (mem >> 1) + (mem >> 2);
398 zone->swap_limit = zone->max_mem - (mem >> 3);
399 zone->used_mem = 0;
400 zone->glob = glob;
401 glob->zone_dma32 = zone;
402 ret = kobject_init_and_add(
403 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
404 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0)) {
405 kobject_put(&zone->kobj);
406 return ret;
407 }
408 glob->zones[glob->num_zones++] = zone;
409 return 0;
410}
411#endif
412
413int ttm_mem_global_init(struct ttm_mem_global *glob)
414{
415 uint64_t mem;
416 int ret;
417 int i;
418 struct ttm_mem_zone *zone;
419
420 mtx_init(&glob->lock, IPL_NONE)do { (void)(((void *)0)); (void)(0); __mtx_init((&glob->
lock), ((((0x0)) > 0x0 && ((0x0)) < 0x9) ? 0x9 :
((0x0)))); } while (0);
421 glob->swap_queue = create_singlethread_workqueue("ttm_swap");
422 INIT_WORK(&glob->work, ttm_shrink_work);
423 ret = kobject_init_and_add(
424 &glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting");
425 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0)) {
426 kobject_put(&glob->kobj);
427 return ret;
428 }
429
430 mem = ptoa(physmem)((paddr_t)(physmem) << 12);
431
432 /* set it as 0 by default to keep original behavior of OOM */
433 glob->lower_mem_limit = 0;
434
435 ret = ttm_mem_init_kernel_zone(glob, mem);
436 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0))
437 goto out_no_zone;
438#ifdef CONFIG_HIGHMEM
439 ret = ttm_mem_init_highmem_zone(glob, mem);
440 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0))
441 goto out_no_zone;
442#else
443 ret = ttm_mem_init_dma32_zone(glob, mem);
444 if (unlikely(ret != 0)__builtin_expect(!!(ret != 0), 0))
445 goto out_no_zone;
446#endif
447 for (i = 0; i < glob->num_zones; ++i) {
448 zone = glob->zones[i];
Value stored to 'zone' is never read
449 pr_info("Zone %7s: Available graphics memory: %llu KiB\n",do { } while(0)
450 zone->name, (unsigned long long)zone->max_mem >> 10)do { } while(0);
451 }
452 ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE(1 << 12)));
453 ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE(1 << 12)));
454 return 0;
455out_no_zone:
456 ttm_mem_global_release(glob);
457 return ret;
458}
459
460void ttm_mem_global_release(struct ttm_mem_global *glob)
461{
462 struct ttm_mem_zone *zone;
463 unsigned int i;
464
465 /* let the page allocator first stop the shrink work. */
466 ttm_page_alloc_fini();
467 ttm_dma_page_alloc_fini();
468
469 flush_workqueue(glob->swap_queue);
470 destroy_workqueue(glob->swap_queue);
471 glob->swap_queue = NULL((void *)0);
472 for (i = 0; i < glob->num_zones; ++i) {
473 zone = glob->zones[i];
474 kobject_del(&zone->kobj);
475 kobject_put(&zone->kobj);
476 }
477 kobject_del(&glob->kobj);
478 kobject_put(&glob->kobj);
479 memset(glob, 0, sizeof(*glob))__builtin_memset((glob), (0), (sizeof(*glob)));
480}
481
482static void ttm_check_swapping(struct ttm_mem_global *glob)
483{
484 bool_Bool needs_swapping = false0;
485 unsigned int i;
486 struct ttm_mem_zone *zone;
487
488 spin_lock(&glob->lock)mtx_enter(&glob->lock);
489 for (i = 0; i < glob->num_zones; ++i) {
490 zone = glob->zones[i];
491 if (zone->used_mem > zone->swap_limit) {
492 needs_swapping = true1;
493 break;
494 }
495 }
496
497 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
498
499 if (unlikely(needs_swapping)__builtin_expect(!!(needs_swapping), 0))
500 (void)queue_work(glob->swap_queue, &glob->work);
501
502}
503
504static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
505 struct ttm_mem_zone *single_zone,
506 uint64_t amount)
507{
508 unsigned int i;
509 struct ttm_mem_zone *zone;
510
511 spin_lock(&glob->lock)mtx_enter(&glob->lock);
512 for (i = 0; i < glob->num_zones; ++i) {
513 zone = glob->zones[i];
514 if (single_zone && zone != single_zone)
515 continue;
516 zone->used_mem -= amount;
517 }
518 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
519}
520
521void ttm_mem_global_free(struct ttm_mem_global *glob,
522 uint64_t amount)
523{
524 return ttm_mem_global_free_zone(glob, glob->zone_kernel, amount);
525}
526EXPORT_SYMBOL(ttm_mem_global_free);
527
528/*
529 * check if the available mem is under lower memory limit
530 *
531 * a. if no swap disk at all or free swap space is under swap_mem_limit
532 * but available system mem is bigger than sys_mem_limit, allow TTM
533 * allocation;
534 *
535 * b. if the available system mem is less than sys_mem_limit but free
536 * swap disk is bigger than swap_mem_limit, allow TTM allocation.
537 */
538bool_Bool
539ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
540 uint64_t num_pages,
541 struct ttm_operation_ctx *ctx)
542{
543 int64_t available;
544
545 if (ctx->flags & TTM_OPT_FLAG_FORCE_ALLOC0x2)
546 return false0;
547
548 available = get_nr_swap_pages() + si_mem_available();
549 available -= num_pages;
550 if (available < glob->lower_mem_limit)
551 return true1;
552
553 return false0;
554}
555
556static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
557 struct ttm_mem_zone *single_zone,
558 uint64_t amount, bool_Bool reserve)
559{
560 uint64_t limit;
561 int ret = -ENOMEM12;
562 unsigned int i;
563 struct ttm_mem_zone *zone;
564
565 spin_lock(&glob->lock)mtx_enter(&glob->lock);
566 for (i = 0; i < glob->num_zones; ++i) {
567 zone = glob->zones[i];
568 if (single_zone && zone != single_zone)
569 continue;
570
571 limit = (capable(CAP_SYS_ADMIN0x1)) ?
572 zone->emer_mem : zone->max_mem;
573
574 if (zone->used_mem > limit)
575 goto out_unlock;
576 }
577
578 if (reserve) {
579 for (i = 0; i < glob->num_zones; ++i) {
580 zone = glob->zones[i];
581 if (single_zone && zone != single_zone)
582 continue;
583 zone->used_mem += amount;
584 }
585 }
586
587 ret = 0;
588out_unlock:
589 spin_unlock(&glob->lock)mtx_leave(&glob->lock);
590 ttm_check_swapping(glob);
591
592 return ret;
593}
594
595
596static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
597 struct ttm_mem_zone *single_zone,
598 uint64_t memory,
599 struct ttm_operation_ctx *ctx)
600{
601 int count = TTM_MEMORY_ALLOC_RETRIES4;
602
603 while (unlikely(ttm_mem_global_reserve(glob,__builtin_expect(!!(ttm_mem_global_reserve(glob, single_zone,
memory, 1) != 0), 0)
604 single_zone,__builtin_expect(!!(ttm_mem_global_reserve(glob, single_zone,
memory, 1) != 0), 0)
605 memory, true)__builtin_expect(!!(ttm_mem_global_reserve(glob, single_zone,
memory, 1) != 0), 0)
606 != 0)__builtin_expect(!!(ttm_mem_global_reserve(glob, single_zone,
memory, 1) != 0), 0)) {
607 if (ctx->no_wait_gpu)
608 return -ENOMEM12;
609 if (unlikely(count-- == 0)__builtin_expect(!!(count-- == 0), 0))
610 return -ENOMEM12;
611 ttm_shrink(glob, false0, memory + (memory >> 2) + 16, ctx);
612 }
613
614 return 0;
615}
616
617int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
618 struct ttm_operation_ctx *ctx)
619{
620 /**
621 * Normal allocations of kernel memory are registered in
622 * the kernel zone.
623 */
624
625 return ttm_mem_global_alloc_zone(glob, glob->zone_kernel, memory, ctx);
626}
627EXPORT_SYMBOL(ttm_mem_global_alloc);
628
629int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
630 struct vm_page *page, uint64_t size,
631 struct ttm_operation_ctx *ctx)
632{
633 struct ttm_mem_zone *zone = NULL((void *)0);
634
635 /**
636 * Page allocations may be registed in a single zone
637 * only if highmem or !dma32.
638 */
639
640#ifdef CONFIG_HIGHMEM
641 if (PageHighMem(page)0 && glob->zone_highmem != NULL((void *)0))
642 zone = glob->zone_highmem;
643#else
644 if (glob->zone_dma32 && page_to_pfn(page)(((page)->phys_addr) / (1 << 12)) > 0x00100000UL)
645 zone = glob->zone_kernel;
646#endif
647 return ttm_mem_global_alloc_zone(glob, zone, size, ctx);
648}
649
650void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct vm_page *page,
651 uint64_t size)
652{
653 struct ttm_mem_zone *zone = NULL((void *)0);
654
655#ifdef CONFIG_HIGHMEM
656 if (PageHighMem(page)0 && glob->zone_highmem != NULL((void *)0))
657 zone = glob->zone_highmem;
658#else
659 if (glob->zone_dma32 && page_to_pfn(page)(((page)->phys_addr) / (1 << 12)) > 0x00100000UL)
660 zone = glob->zone_kernel;
661#endif
662 ttm_mem_global_free_zone(glob, zone, size);
663}
664
665size_t ttm_round_pot(size_t size)
666{
667 if ((size & (size - 1)) == 0)
668 return size;
669 else if (size > PAGE_SIZE(1 << 12))
670 return PAGE_ALIGN(size)(((size) + ((1 << 12) - 1)) & ~((1 << 12) - 1
));
671 else {
672 size_t tmp_size = 4;
673
674 while (tmp_size < size)
675 tmp_size <<= 1;
676
677 return tmp_size;
678 }
679 return 0;
680}
681EXPORT_SYMBOL(ttm_round_pot);