diff options
Diffstat (limited to 'drivers/gpu/nvgpu/common/mm/comptags.c')
-rw-r--r-- | drivers/gpu/nvgpu/common/mm/comptags.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/gpu/nvgpu/common/mm/comptags.c b/drivers/gpu/nvgpu/common/mm/comptags.c new file mode 100644 index 00000000..8f2fe90f --- /dev/null +++ b/drivers/gpu/nvgpu/common/mm/comptags.c | |||
@@ -0,0 +1,95 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2017, 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 | #include <nvgpu/bitops.h> | ||
24 | #include <nvgpu/comptags.h> | ||
25 | |||
26 | #include "gk20a/gk20a.h" | ||
27 | |||
28 | int gk20a_comptaglines_alloc(struct gk20a_comptag_allocator *allocator, | ||
29 | u32 *offset, u32 len) | ||
30 | { | ||
31 | unsigned long addr; | ||
32 | int err = 0; | ||
33 | |||
34 | nvgpu_mutex_acquire(&allocator->lock); | ||
35 | addr = bitmap_find_next_zero_area(allocator->bitmap, allocator->size, | ||
36 | 0, len, 0); | ||
37 | if (addr < allocator->size) { | ||
38 | /* number zero is reserved; bitmap base is 1 */ | ||
39 | *offset = 1 + addr; | ||
40 | bitmap_set(allocator->bitmap, addr, len); | ||
41 | } else { | ||
42 | err = -ENOMEM; | ||
43 | } | ||
44 | nvgpu_mutex_release(&allocator->lock); | ||
45 | |||
46 | return err; | ||
47 | } | ||
48 | |||
49 | void gk20a_comptaglines_free(struct gk20a_comptag_allocator *allocator, | ||
50 | u32 offset, u32 len) | ||
51 | { | ||
52 | /* number zero is reserved; bitmap base is 1 */ | ||
53 | u32 addr = offset - 1; | ||
54 | |||
55 | WARN_ON(offset == 0); | ||
56 | WARN_ON(addr > allocator->size); | ||
57 | WARN_ON(addr + len > allocator->size); | ||
58 | |||
59 | nvgpu_mutex_acquire(&allocator->lock); | ||
60 | bitmap_clear(allocator->bitmap, addr, len); | ||
61 | nvgpu_mutex_release(&allocator->lock); | ||
62 | } | ||
63 | |||
64 | int gk20a_comptag_allocator_init(struct gk20a *g, | ||
65 | struct gk20a_comptag_allocator *allocator, | ||
66 | unsigned long size) | ||
67 | { | ||
68 | nvgpu_mutex_init(&allocator->lock); | ||
69 | |||
70 | /* | ||
71 | * 0th comptag is special and is never used. The base for this bitmap | ||
72 | * is 1, and its size is one less than the size of comptag store. | ||
73 | */ | ||
74 | size--; | ||
75 | allocator->bitmap = nvgpu_vzalloc(g, | ||
76 | BITS_TO_LONGS(size) * sizeof(long)); | ||
77 | if (!allocator->bitmap) | ||
78 | return -ENOMEM; | ||
79 | |||
80 | allocator->size = size; | ||
81 | |||
82 | return 0; | ||
83 | } | ||
84 | |||
85 | void gk20a_comptag_allocator_destroy(struct gk20a *g, | ||
86 | struct gk20a_comptag_allocator *allocator) | ||
87 | { | ||
88 | /* | ||
89 | * called only when exiting the driver (gk20a_remove, or unwinding the | ||
90 | * init stage); no users should be active, so taking the mutex is | ||
91 | * unnecessary here. | ||
92 | */ | ||
93 | allocator->size = 0; | ||
94 | nvgpu_vfree(g, allocator->bitmap); | ||
95 | } | ||