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1/*
2 * Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 */
22
23#ifndef NVGPU_ALLOCATOR_H
24#define NVGPU_ALLOCATOR_H
25
26#ifdef __KERNEL__
27/*
28 * The Linux kernel has this notion of seq_files for printing info to userspace.
29 * One of the allocator function pointers takes advantage of this and allows the
30 * debug output to be directed either to nvgpu_log() or a seq_file.
31 */
32#include <linux/seq_file.h>
33#endif
34
35#include <nvgpu/log.h>
36#include <nvgpu/lock.h>
37#include <nvgpu/list.h>
38#include <nvgpu/types.h>
39
40/* #define ALLOCATOR_DEBUG_FINE */
41
42struct nvgpu_allocator;
43struct nvgpu_alloc_carveout;
44struct vm_gk20a;
45struct gk20a;
46
47/*
48 * Operations for an allocator to implement.
49 */
50struct nvgpu_allocator_ops {
51 u64 (*alloc)(struct nvgpu_allocator *allocator, u64 len);
52 u64 (*alloc_pte)(struct nvgpu_allocator *allocator, u64 len,
53 u32 page_size);
54 void (*free)(struct nvgpu_allocator *allocator, u64 addr);
55
56 /*
57 * Special interface to allocate a memory region with a specific
58 * starting address. Yikes. Note: if free() works for freeing both
59 * regular and fixed allocations then free_fixed() does not need to
60 * be implemented. This behavior exists for legacy reasons and should
61 * not be propagated to new allocators.
62 *
63 * For allocators where the @page_size field is not applicable it can
64 * be left as 0. Otherwise a valid page size should be passed (4k or
65 * what the large page size is).
66 */
67 u64 (*alloc_fixed)(struct nvgpu_allocator *allocator,
68 u64 base, u64 len, u32 page_size);
69 void (*free_fixed)(struct nvgpu_allocator *allocator,
70 u64 base, u64 len);
71
72 /*
73 * Allow allocators to reserve space for carveouts.
74 */
75 int (*reserve_carveout)(struct nvgpu_allocator *allocator,
76 struct nvgpu_alloc_carveout *co);
77 void (*release_carveout)(struct nvgpu_allocator *allocator,
78 struct nvgpu_alloc_carveout *co);
79
80 /*
81 * Returns info about the allocator.
82 */
83 u64 (*base)(struct nvgpu_allocator *allocator);
84 u64 (*length)(struct nvgpu_allocator *allocator);
85 u64 (*end)(struct nvgpu_allocator *allocator);
86 bool (*inited)(struct nvgpu_allocator *allocator);
87 u64 (*space)(struct nvgpu_allocator *allocator);
88
89 /* Destructor. */
90 void (*fini)(struct nvgpu_allocator *allocator);
91
92#ifdef __KERNEL__
93 /* Debugging. */
94 void (*print_stats)(struct nvgpu_allocator *allocator,
95 struct seq_file *s, int lock);
96#endif
97};
98
99struct nvgpu_allocator {
100 struct gk20a *g;
101
102 char name[32];
103 struct nvgpu_mutex lock;
104
105 void *priv;
106 const struct nvgpu_allocator_ops *ops;
107
108 struct dentry *debugfs_entry;
109 bool debug; /* Control for debug msgs. */
110};
111
112struct nvgpu_alloc_carveout {
113 const char *name;
114 u64 base;
115 u64 length;
116
117 struct nvgpu_allocator *allocator;
118
119 /*
120 * For usage by the allocator implementation.
121 */
122 struct nvgpu_list_node co_entry;
123};
124
125static inline struct nvgpu_alloc_carveout *
126nvgpu_alloc_carveout_from_co_entry(struct nvgpu_list_node *node)
127{
128 return (struct nvgpu_alloc_carveout *)
129 ((uintptr_t)node - offsetof(struct nvgpu_alloc_carveout, co_entry));
130};
131
132#define NVGPU_CARVEOUT(local_name, local_base, local_length) \
133 { \
134 .name = (local_name), \
135 .base = (local_base), \
136 .length = (local_length) \
137 }
138
139/*
140 * These are the available allocator flags.
141 *
142 * GPU_ALLOC_GVA_SPACE
143 *
144 * This flag makes sense for the buddy allocator only. It specifies that the
145 * allocator will be used for managing a GVA space. When managing GVA spaces
146 * special care has to be taken to ensure that allocations of similar PTE
147 * sizes are placed in the same PDE block. This allows the higher level
148 * code to skip defining both small and large PTE tables for every PDE. That
149 * can save considerable memory for address spaces that have a lot of
150 * allocations.
151 *
152 * GPU_ALLOC_NO_ALLOC_PAGE
153 *
154 * For any allocator that needs to manage a resource in a latency critical
155 * path this flag specifies that the allocator should not use any kmalloc()
156 * or similar functions during normal operation. Initialization routines
157 * may still use kmalloc(). This prevents the possibility of long waits for
158 * pages when using alloc_page(). Currently only the bitmap allocator
159 * implements this functionality.
160 *
161 * Also note that if you accept this flag then you must also define the
162 * free_fixed() function. Since no meta-data is allocated to help free
163 * allocations you need to keep track of the meta-data yourself (in this
164 * case the base and length of the allocation as opposed to just the base
165 * of the allocation).
166 *
167 * GPU_ALLOC_4K_VIDMEM_PAGES
168 *
169 * We manage vidmem pages at a large page granularity for performance
170 * reasons; however, this can lead to wasting memory. For page allocators
171 * setting this flag will tell the allocator to manage pools of 4K pages
172 * inside internally allocated large pages.
173 *
174 * Currently this flag is ignored since the only usage of the page allocator
175 * uses a 4K block size already. However, this flag has been reserved since
176 * it will be necessary in the future.
177 *
178 * GPU_ALLOC_FORCE_CONTIG
179 *
180 * Force allocations to be contiguous. Currently only relevant for page
181 * allocators since all other allocators are naturally contiguous.
182 *
183 * GPU_ALLOC_NO_SCATTER_GATHER
184 *
185 * The page allocator normally returns a scatter gather data structure for
186 * allocations (to handle discontiguous pages). However, at times that can
187 * be annoying so this flag forces the page allocator to return a u64
188 * pointing to the allocation base (requires GPU_ALLOC_FORCE_CONTIG to be
189 * set as well).
190 */
191#define GPU_ALLOC_GVA_SPACE BIT64(0)
192#define GPU_ALLOC_NO_ALLOC_PAGE BIT64(1)
193#define GPU_ALLOC_4K_VIDMEM_PAGES BIT64(2)
194#define GPU_ALLOC_FORCE_CONTIG BIT64(3)
195#define GPU_ALLOC_NO_SCATTER_GATHER BIT64(4)
196
197static inline void alloc_lock(struct nvgpu_allocator *a)
198{
199 nvgpu_mutex_acquire(&a->lock);
200}
201
202static inline void alloc_unlock(struct nvgpu_allocator *a)
203{
204 nvgpu_mutex_release(&a->lock);
205}
206
207/*
208 * Buddy allocator specific initializers.
209 */
210int nvgpu_buddy_allocator_init(struct gk20a *g, struct nvgpu_allocator *na,
211 struct vm_gk20a *vm, const char *name,
212 u64 base, u64 size, u64 blk_size,
213 u64 max_order, u64 flags);
214
215/*
216 * Bitmap initializers.
217 */
218int nvgpu_bitmap_allocator_init(struct gk20a *g, struct nvgpu_allocator *na,
219 const char *name, u64 base, u64 length,
220 u64 blk_size, u64 flags);
221
222/*
223 * Page allocator initializers.
224 */
225int nvgpu_page_allocator_init(struct gk20a *g, struct nvgpu_allocator *na,
226 const char *name, u64 base, u64 length,
227 u64 blk_size, u64 flags);
228
229/*
230 * Lockless allocatior initializers.
231 * Note: This allocator can only allocate fixed-size structures of a
232 * pre-defined size.
233 */
234int nvgpu_lockless_allocator_init(struct gk20a *g, struct nvgpu_allocator *na,
235 const char *name, u64 base, u64 length,
236 u64 struct_size, u64 flags);
237
238#define GPU_BALLOC_MAX_ORDER 31U
239
240/*
241 * Allocator APIs.
242 */
243u64 nvgpu_alloc(struct nvgpu_allocator *allocator, u64 len);
244u64 nvgpu_alloc_pte(struct nvgpu_allocator *a, u64 len, u32 page_size);
245void nvgpu_free(struct nvgpu_allocator *allocator, u64 addr);
246
247u64 nvgpu_alloc_fixed(struct nvgpu_allocator *allocator, u64 base, u64 len,
248 u32 page_size);
249void nvgpu_free_fixed(struct nvgpu_allocator *allocator, u64 base, u64 len);
250
251int nvgpu_alloc_reserve_carveout(struct nvgpu_allocator *a,
252 struct nvgpu_alloc_carveout *co);
253void nvgpu_alloc_release_carveout(struct nvgpu_allocator *a,
254 struct nvgpu_alloc_carveout *co);
255
256u64 nvgpu_alloc_base(struct nvgpu_allocator *a);
257u64 nvgpu_alloc_length(struct nvgpu_allocator *a);
258u64 nvgpu_alloc_end(struct nvgpu_allocator *a);
259bool nvgpu_alloc_initialized(struct nvgpu_allocator *a);
260u64 nvgpu_alloc_space(struct nvgpu_allocator *a);
261
262void nvgpu_alloc_destroy(struct nvgpu_allocator *allocator);
263
264#ifdef __KERNEL__
265void nvgpu_alloc_print_stats(struct nvgpu_allocator *a,
266 struct seq_file *s, int lock);
267#endif
268
269static inline struct gk20a *nvgpu_alloc_to_gpu(struct nvgpu_allocator *a)
270{
271 return a->g;
272}
273
274#ifdef CONFIG_DEBUG_FS
275/*
276 * Common functionality for the internals of the allocators.
277 */
278void nvgpu_init_alloc_debug(struct gk20a *g, struct nvgpu_allocator *a);
279void nvgpu_fini_alloc_debug(struct nvgpu_allocator *a);
280#endif
281
282int nvgpu_alloc_common_init(struct nvgpu_allocator *a, struct gk20a *g,
283 const char *name, void *priv, bool dbg,
284 const struct nvgpu_allocator_ops *ops);
285
286static inline void nvgpu_alloc_enable_dbg(struct nvgpu_allocator *a)
287{
288 a->debug = true;
289}
290
291static inline void nvgpu_alloc_disable_dbg(struct nvgpu_allocator *a)
292{
293 a->debug = false;
294}
295
296/*
297 * Debug stuff.
298 */
299#ifdef __KERNEL__
300#define __alloc_pstat(seq, allocator, fmt, arg...) \
301 do { \
302 if (seq) \
303 seq_printf(seq, fmt "\n", ##arg); \
304 else \
305 alloc_dbg(allocator, fmt, ##arg); \
306 } while (0)
307#endif
308
309#define do_alloc_dbg(a, fmt, arg...) \
310 nvgpu_log((a)->g, gpu_dbg_alloc, "%25s " fmt, (a)->name, ##arg)
311
312/*
313 * This gives finer control over debugging messages. By defining the
314 * ALLOCATOR_DEBUG_FINE macro prints for an allocator will only get made if
315 * that allocator's debug flag is set.
316 *
317 * Otherwise debugging is as normal: debug statements for all allocators
318 * if the GPU debugging mask bit is set. Note: even when ALLOCATOR_DEBUG_FINE
319 * is set gpu_dbg_alloc must still also be set to true.
320 */
321#if defined(ALLOCATOR_DEBUG_FINE)
322#define alloc_dbg(a, fmt, arg...) \
323 do { \
324 if ((a)->debug) \
325 do_alloc_dbg((a), fmt, ##arg); \
326 } while (0)
327#else
328#define alloc_dbg(a, fmt, arg...) do_alloc_dbg(a, fmt, ##arg)
329#endif
330
331#endif /* NVGPU_ALLOCATOR_H */
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