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(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 */
snd_free_dev_iram(struct snd_dma_buffer * dmab)86 static 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 */
snd_dma_alloc_pages(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)116 int 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 }
169 EXPORT_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 */
snd_dma_alloc_pages_fallback(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)186 int 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 }
203 EXPORT_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 */
snd_dma_free_pages(struct snd_dma_buffer * dmab)212 void 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 }
239 EXPORT_SYMBOL(snd_dma_free_pages);
240
