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 */
snd_malloc_dev_pages(struct snd_dma_buffer * dmab,size_t size)26 static 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 */
snd_free_dev_pages(struct snd_dma_buffer * dmab)44 static 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 */
snd_malloc_dev_iram(struct snd_dma_buffer * dmab,size_t size)62 static 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_align(pool, size, &dmab->addr,
80 PAGE_SIZE);
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 */
snd_free_dev_iram(struct snd_dma_buffer * dmab)87 static 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
103
104 /**
105 * snd_dma_alloc_pages - allocate the buffer area according to the given type
106 * @type: the DMA buffer type
107 * @device: the device pointer
108 * @size: the buffer size to allocate
109 * @dmab: buffer allocation record to store the allocated data
110 *
111 * Calls the memory-allocator function for the corresponding
112 * buffer type.
113 *
114 * Return: Zero if the buffer with the given size is allocated successfully,
115 * otherwise a negative value on error.
116 */
snd_dma_alloc_pages(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)117 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
118 struct snd_dma_buffer *dmab)
119 {
120 if (WARN_ON(!size))
121 return -ENXIO;
122 if (WARN_ON(!dmab))
123 return -ENXIO;
124 if (WARN_ON(!device))
125 return -EINVAL;
126
127 size = PAGE_ALIGN(size);
128 dmab->dev.type = type;
129 dmab->dev.dev = device;
130 dmab->bytes = 0;
131 switch (type) {
132 case SNDRV_DMA_TYPE_CONTINUOUS:
133 dmab->area = alloc_pages_exact(size,
134 (__force gfp_t)(unsigned long)device);
135 dmab->addr = 0;
136 break;
137 #ifdef CONFIG_HAS_DMA
138 #ifdef CONFIG_GENERIC_ALLOCATOR
139 case SNDRV_DMA_TYPE_DEV_IRAM:
140 snd_malloc_dev_iram(dmab, size);
141 if (dmab->area)
142 break;
143 /* Internal memory might have limited size and no enough space,
144 * so if we fail to malloc, try to fetch memory traditionally.
145 */
146 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
147 #endif /* CONFIG_GENERIC_ALLOCATOR */
148 /* fall through */
149 case SNDRV_DMA_TYPE_DEV:
150 case SNDRV_DMA_TYPE_DEV_UC:
151 snd_malloc_dev_pages(dmab, size);
152 break;
153 #endif
154 #ifdef CONFIG_SND_DMA_SGBUF
155 case SNDRV_DMA_TYPE_DEV_SG:
156 case SNDRV_DMA_TYPE_DEV_UC_SG:
157 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
158 break;
159 #endif
160 default:
161 pr_err("snd-malloc: invalid device type %d\n", type);
162 dmab->area = NULL;
163 dmab->addr = 0;
164 return -ENXIO;
165 }
166 if (! dmab->area)
167 return -ENOMEM;
168 dmab->bytes = size;
169 return 0;
170 }
171 EXPORT_SYMBOL(snd_dma_alloc_pages);
172
173 /**
174 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
175 * @type: the DMA buffer type
176 * @device: the device pointer
177 * @size: the buffer size to allocate
178 * @dmab: buffer allocation record to store the allocated data
179 *
180 * Calls the memory-allocator function for the corresponding
181 * buffer type. When no space is left, this function reduces the size and
182 * tries to allocate again. The size actually allocated is stored in
183 * res_size argument.
184 *
185 * Return: Zero if the buffer with the given size is allocated successfully,
186 * otherwise a negative value on error.
187 */
snd_dma_alloc_pages_fallback(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)188 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
189 struct snd_dma_buffer *dmab)
190 {
191 int err;
192
193 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
194 if (err != -ENOMEM)
195 return err;
196 if (size <= PAGE_SIZE)
197 return -ENOMEM;
198 size >>= 1;
199 size = PAGE_SIZE << get_order(size);
200 }
201 if (! dmab->area)
202 return -ENOMEM;
203 return 0;
204 }
205 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
206
207
208 /**
209 * snd_dma_free_pages - release the allocated buffer
210 * @dmab: the buffer allocation record to release
211 *
212 * Releases the allocated buffer via snd_dma_alloc_pages().
213 */
snd_dma_free_pages(struct snd_dma_buffer * dmab)214 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
215 {
216 switch (dmab->dev.type) {
217 case SNDRV_DMA_TYPE_CONTINUOUS:
218 free_pages_exact(dmab->area, dmab->bytes);
219 break;
220 #ifdef CONFIG_HAS_DMA
221 #ifdef CONFIG_GENERIC_ALLOCATOR
222 case SNDRV_DMA_TYPE_DEV_IRAM:
223 snd_free_dev_iram(dmab);
224 break;
225 #endif /* CONFIG_GENERIC_ALLOCATOR */
226 case SNDRV_DMA_TYPE_DEV:
227 case SNDRV_DMA_TYPE_DEV_UC:
228 snd_free_dev_pages(dmab);
229 break;
230 #endif
231 #ifdef CONFIG_SND_DMA_SGBUF
232 case SNDRV_DMA_TYPE_DEV_SG:
233 case SNDRV_DMA_TYPE_DEV_UC_SG:
234 snd_free_sgbuf_pages(dmab);
235 break;
236 #endif
237 default:
238 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
239 }
240 }
241 EXPORT_SYMBOL(snd_dma_free_pages);
242