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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
5 *
6 * Generic memory allocators
7 */
8
9#include <linux/slab.h>
10#include <linux/mm.h>
11#include <linux/dma-mapping.h>
12#include <linux/genalloc.h>
13#ifdef CONFIG_X86
14#include <asm/set_memory.h>
15#endif
16#include <sound/memalloc.h>
17
18/*
19 *
20 * Bus-specific memory allocators
21 *
22 */
23
24#ifdef CONFIG_HAS_DMA
25/* allocate the coherent DMA pages */
26static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
27{
28 gfp_t gfp_flags;
29
30 gfp_flags = GFP_KERNEL
31 | __GFP_COMP /* compound page lets parts be mapped */
32 | __GFP_NORETRY /* don't trigger OOM-killer */
33 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
34 dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
35 gfp_flags);
36#ifdef CONFIG_X86
37 if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
38 set_memory_wc((unsigned long)dmab->area,
39 PAGE_ALIGN(size) >> PAGE_SHIFT);
40#endif
41}
42
43/* free the coherent DMA pages */
44static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
45{
46#ifdef CONFIG_X86
47 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
48 set_memory_wb((unsigned long)dmab->area,
49 PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
50#endif
51 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
52}
53
54#ifdef CONFIG_GENERIC_ALLOCATOR
55/**
56 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
57 * @dmab: buffer allocation record to store the allocated data
58 * @size: number of bytes to allocate from the iram
59 *
60 * This function requires iram phandle provided via of_node
61 */
62static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
63{
64 struct device *dev = dmab->dev.dev;
65 struct gen_pool *pool = NULL;
66
67 dmab->area = NULL;
68 dmab->addr = 0;
69
70 if (dev->of_node)
71 pool = of_gen_pool_get(dev->of_node, "iram", 0);
72
73 if (!pool)
74 return;
75
76 /* Assign the pool into private_data field */
77 dmab->private_data = pool;
78
79 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
80}
81
82/**
83 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
84 * @dmab: buffer allocation record to store the allocated data
85 */
86static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
87{
88 struct gen_pool *pool = dmab->private_data;
89
90 if (pool && dmab->area)
91 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
92}
93#endif /* CONFIG_GENERIC_ALLOCATOR */
94#endif /* CONFIG_HAS_DMA */
95
96/*
97 *
98 * ALSA generic memory management
99 *
100 */
101
102
103/**
104 * snd_dma_alloc_pages - allocate the buffer area according to the given type
105 * @type: the DMA buffer type
106 * @device: the device pointer
107 * @size: the buffer size to allocate
108 * @dmab: buffer allocation record to store the allocated data
109 *
110 * Calls the memory-allocator function for the corresponding
111 * buffer type.
112 *
113 * Return: Zero if the buffer with the given size is allocated successfully,
114 * otherwise a negative value on error.
115 */
116int snd_dma_alloc_pages(int type, struct device *device, size_t size,
117 struct snd_dma_buffer *dmab)
118{
119 if (WARN_ON(!size))
120 return -ENXIO;
121 if (WARN_ON(!dmab))
122 return -ENXIO;
123 if (WARN_ON(!device))
124 return -EINVAL;
125
126 dmab->dev.type = type;
127 dmab->dev.dev = device;
128 dmab->bytes = 0;
129 switch (type) {
130 case SNDRV_DMA_TYPE_CONTINUOUS:
131 dmab->area = alloc_pages_exact(size,
132 (__force gfp_t)(unsigned long)device);
133 dmab->addr = 0;
134 break;
135#ifdef CONFIG_HAS_DMA
136#ifdef CONFIG_GENERIC_ALLOCATOR
137 case SNDRV_DMA_TYPE_DEV_IRAM:
138 snd_malloc_dev_iram(dmab, size);
139 if (dmab->area)
140 break;
141 /* Internal memory might have limited size and no enough space,
142 * so if we fail to malloc, try to fetch memory traditionally.
143 */
144 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
145#endif /* CONFIG_GENERIC_ALLOCATOR */
146 /* fall through */
147 case SNDRV_DMA_TYPE_DEV:
148 case SNDRV_DMA_TYPE_DEV_UC:
149 snd_malloc_dev_pages(dmab, size);
150 break;
151#endif
152#ifdef CONFIG_SND_DMA_SGBUF
153 case SNDRV_DMA_TYPE_DEV_SG:
154 case SNDRV_DMA_TYPE_DEV_UC_SG:
155 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
156 break;
157#endif
158 default:
159 pr_err("snd-malloc: invalid device type %d\n", type);
160 dmab->area = NULL;
161 dmab->addr = 0;
162 return -ENXIO;
163 }
164 if (! dmab->area)
165 return -ENOMEM;
166 dmab->bytes = size;
167 return 0;
168}
169EXPORT_SYMBOL(snd_dma_alloc_pages);
170
171/**
172 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
173 * @type: the DMA buffer type
174 * @device: the device pointer
175 * @size: the buffer size to allocate
176 * @dmab: buffer allocation record to store the allocated data
177 *
178 * Calls the memory-allocator function for the corresponding
179 * buffer type. When no space is left, this function reduces the size and
180 * tries to allocate again. The size actually allocated is stored in
181 * res_size argument.
182 *
183 * Return: Zero if the buffer with the given size is allocated successfully,
184 * otherwise a negative value on error.
185 */
186int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
187 struct snd_dma_buffer *dmab)
188{
189 int err;
190
191 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
192 if (err != -ENOMEM)
193 return err;
194 if (size <= PAGE_SIZE)
195 return -ENOMEM;
196 size >>= 1;
197 size = PAGE_SIZE << get_order(size);
198 }
199 if (! dmab->area)
200 return -ENOMEM;
201 return 0;
202}
203EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
204
205
206/**
207 * snd_dma_free_pages - release the allocated buffer
208 * @dmab: the buffer allocation record to release
209 *
210 * Releases the allocated buffer via snd_dma_alloc_pages().
211 */
212void snd_dma_free_pages(struct snd_dma_buffer *dmab)
213{
214 switch (dmab->dev.type) {
215 case SNDRV_DMA_TYPE_CONTINUOUS:
216 free_pages_exact(dmab->area, dmab->bytes);
217 break;
218#ifdef CONFIG_HAS_DMA
219#ifdef CONFIG_GENERIC_ALLOCATOR
220 case SNDRV_DMA_TYPE_DEV_IRAM:
221 snd_free_dev_iram(dmab);
222 break;
223#endif /* CONFIG_GENERIC_ALLOCATOR */
224 case SNDRV_DMA_TYPE_DEV:
225 case SNDRV_DMA_TYPE_DEV_UC:
226 snd_free_dev_pages(dmab);
227 break;
228#endif
229#ifdef CONFIG_SND_DMA_SGBUF
230 case SNDRV_DMA_TYPE_DEV_SG:
231 case SNDRV_DMA_TYPE_DEV_UC_SG:
232 snd_free_sgbuf_pages(dmab);
233 break;
234#endif
235 default:
236 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
237 }
238}
239EXPORT_SYMBOL(snd_dma_free_pages);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
5 *
6 * Generic memory allocators
7 */
8
9#include <linux/slab.h>
10#include <linux/mm.h>
11#include <linux/dma-mapping.h>
12#include <linux/genalloc.h>
13#include <linux/vmalloc.h>
14#ifdef CONFIG_X86
15#include <asm/set_memory.h>
16#endif
17#include <sound/memalloc.h>
18
19/*
20 *
21 * Bus-specific memory allocators
22 *
23 */
24
25#ifdef CONFIG_HAS_DMA
26/* allocate the coherent DMA pages */
27static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
28{
29 gfp_t gfp_flags;
30
31 gfp_flags = GFP_KERNEL
32 | __GFP_COMP /* compound page lets parts be mapped */
33 | __GFP_NORETRY /* don't trigger OOM-killer */
34 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
35 dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
36 gfp_flags);
37#ifdef CONFIG_X86
38 if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
39 set_memory_wc((unsigned long)dmab->area,
40 PAGE_ALIGN(size) >> PAGE_SHIFT);
41#endif
42}
43
44/* free the coherent DMA pages */
45static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
46{
47#ifdef CONFIG_X86
48 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
49 set_memory_wb((unsigned long)dmab->area,
50 PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
51#endif
52 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
53}
54
55#ifdef CONFIG_GENERIC_ALLOCATOR
56/**
57 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
58 * @dmab: buffer allocation record to store the allocated data
59 * @size: number of bytes to allocate from the iram
60 *
61 * This function requires iram phandle provided via of_node
62 */
63static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
64{
65 struct device *dev = dmab->dev.dev;
66 struct gen_pool *pool = NULL;
67
68 dmab->area = NULL;
69 dmab->addr = 0;
70
71 if (dev->of_node)
72 pool = of_gen_pool_get(dev->of_node, "iram", 0);
73
74 if (!pool)
75 return;
76
77 /* Assign the pool into private_data field */
78 dmab->private_data = pool;
79
80 dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
81}
82
83/**
84 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
85 * @dmab: buffer allocation record to store the allocated data
86 */
87static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
88{
89 struct gen_pool *pool = dmab->private_data;
90
91 if (pool && dmab->area)
92 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
93}
94#endif /* CONFIG_GENERIC_ALLOCATOR */
95#endif /* CONFIG_HAS_DMA */
96
97/*
98 *
99 * ALSA generic memory management
100 *
101 */
102
103static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
104 gfp_t default_gfp)
105{
106 if (!dev)
107 return default_gfp;
108 else
109 return (__force gfp_t)(unsigned long)dev;
110}
111
112/**
113 * snd_dma_alloc_pages - allocate the buffer area according to the given type
114 * @type: the DMA buffer type
115 * @device: the device pointer
116 * @size: the buffer size to allocate
117 * @dmab: buffer allocation record to store the allocated data
118 *
119 * Calls the memory-allocator function for the corresponding
120 * buffer type.
121 *
122 * Return: Zero if the buffer with the given size is allocated successfully,
123 * otherwise a negative value on error.
124 */
125int snd_dma_alloc_pages(int type, struct device *device, size_t size,
126 struct snd_dma_buffer *dmab)
127{
128 gfp_t gfp;
129
130 if (WARN_ON(!size))
131 return -ENXIO;
132 if (WARN_ON(!dmab))
133 return -ENXIO;
134
135 dmab->dev.type = type;
136 dmab->dev.dev = device;
137 dmab->bytes = 0;
138 dmab->area = NULL;
139 dmab->addr = 0;
140 dmab->private_data = NULL;
141 switch (type) {
142 case SNDRV_DMA_TYPE_CONTINUOUS:
143 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
144 dmab->area = alloc_pages_exact(size, gfp);
145 break;
146 case SNDRV_DMA_TYPE_VMALLOC:
147 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
148 dmab->area = __vmalloc(size, gfp);
149 break;
150#ifdef CONFIG_HAS_DMA
151#ifdef CONFIG_GENERIC_ALLOCATOR
152 case SNDRV_DMA_TYPE_DEV_IRAM:
153 snd_malloc_dev_iram(dmab, size);
154 if (dmab->area)
155 break;
156 /* Internal memory might have limited size and no enough space,
157 * so if we fail to malloc, try to fetch memory traditionally.
158 */
159 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
160#endif /* CONFIG_GENERIC_ALLOCATOR */
161 fallthrough;
162 case SNDRV_DMA_TYPE_DEV:
163 case SNDRV_DMA_TYPE_DEV_UC:
164 snd_malloc_dev_pages(dmab, size);
165 break;
166#endif
167#ifdef CONFIG_SND_DMA_SGBUF
168 case SNDRV_DMA_TYPE_DEV_SG:
169 case SNDRV_DMA_TYPE_DEV_UC_SG:
170 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
171 break;
172#endif
173 default:
174 pr_err("snd-malloc: invalid device type %d\n", type);
175 return -ENXIO;
176 }
177 if (! dmab->area)
178 return -ENOMEM;
179 dmab->bytes = size;
180 return 0;
181}
182EXPORT_SYMBOL(snd_dma_alloc_pages);
183
184/**
185 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
186 * @type: the DMA buffer type
187 * @device: the device pointer
188 * @size: the buffer size to allocate
189 * @dmab: buffer allocation record to store the allocated data
190 *
191 * Calls the memory-allocator function for the corresponding
192 * buffer type. When no space is left, this function reduces the size and
193 * tries to allocate again. The size actually allocated is stored in
194 * res_size argument.
195 *
196 * Return: Zero if the buffer with the given size is allocated successfully,
197 * otherwise a negative value on error.
198 */
199int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
200 struct snd_dma_buffer *dmab)
201{
202 int err;
203
204 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
205 if (err != -ENOMEM)
206 return err;
207 if (size <= PAGE_SIZE)
208 return -ENOMEM;
209 size >>= 1;
210 size = PAGE_SIZE << get_order(size);
211 }
212 if (! dmab->area)
213 return -ENOMEM;
214 return 0;
215}
216EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
217
218
219/**
220 * snd_dma_free_pages - release the allocated buffer
221 * @dmab: the buffer allocation record to release
222 *
223 * Releases the allocated buffer via snd_dma_alloc_pages().
224 */
225void snd_dma_free_pages(struct snd_dma_buffer *dmab)
226{
227 switch (dmab->dev.type) {
228 case SNDRV_DMA_TYPE_CONTINUOUS:
229 free_pages_exact(dmab->area, dmab->bytes);
230 break;
231 case SNDRV_DMA_TYPE_VMALLOC:
232 vfree(dmab->area);
233 break;
234#ifdef CONFIG_HAS_DMA
235#ifdef CONFIG_GENERIC_ALLOCATOR
236 case SNDRV_DMA_TYPE_DEV_IRAM:
237 snd_free_dev_iram(dmab);
238 break;
239#endif /* CONFIG_GENERIC_ALLOCATOR */
240 case SNDRV_DMA_TYPE_DEV:
241 case SNDRV_DMA_TYPE_DEV_UC:
242 snd_free_dev_pages(dmab);
243 break;
244#endif
245#ifdef CONFIG_SND_DMA_SGBUF
246 case SNDRV_DMA_TYPE_DEV_SG:
247 case SNDRV_DMA_TYPE_DEV_UC_SG:
248 snd_free_sgbuf_pages(dmab);
249 break;
250#endif
251 default:
252 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
253 }
254}
255EXPORT_SYMBOL(snd_dma_free_pages);