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 */
snd_malloc_dev_pages(struct snd_dma_buffer * dmab,size_t size)27 static 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 */
snd_free_dev_pages(struct snd_dma_buffer * dmab)45 static 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 */
snd_malloc_dev_iram(struct snd_dma_buffer * dmab,size_t size)63 static 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_align(pool, size, &dmab->addr,
81 PAGE_SIZE);
82 }
83
84 /**
85 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
86 * @dmab: buffer allocation record to store the allocated data
87 */
snd_free_dev_iram(struct snd_dma_buffer * dmab)88 static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
89 {
90 struct gen_pool *pool = dmab->private_data;
91
92 if (pool && dmab->area)
93 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
94 }
95 #endif /* CONFIG_GENERIC_ALLOCATOR */
96 #endif /* CONFIG_HAS_DMA */
97
98 /*
99 *
100 * ALSA generic memory management
101 *
102 */
103
snd_mem_get_gfp_flags(const struct device * dev,gfp_t default_gfp)104 static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
105 gfp_t default_gfp)
106 {
107 if (!dev)
108 return default_gfp;
109 else
110 return (__force gfp_t)(unsigned long)dev;
111 }
112
113 /**
114 * snd_dma_alloc_pages - allocate the buffer area according to the given type
115 * @type: the DMA buffer type
116 * @device: the device pointer
117 * @size: the buffer size to allocate
118 * @dmab: buffer allocation record to store the allocated data
119 *
120 * Calls the memory-allocator function for the corresponding
121 * buffer type.
122 *
123 * Return: Zero if the buffer with the given size is allocated successfully,
124 * otherwise a negative value on error.
125 */
snd_dma_alloc_pages(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)126 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
127 struct snd_dma_buffer *dmab)
128 {
129 gfp_t gfp;
130
131 if (WARN_ON(!size))
132 return -ENXIO;
133 if (WARN_ON(!dmab))
134 return -ENXIO;
135
136 dmab->dev.type = type;
137 dmab->dev.dev = device;
138 dmab->bytes = 0;
139 dmab->area = NULL;
140 dmab->addr = 0;
141 dmab->private_data = NULL;
142 switch (type) {
143 case SNDRV_DMA_TYPE_CONTINUOUS:
144 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
145 dmab->area = alloc_pages_exact(size, gfp);
146 break;
147 case SNDRV_DMA_TYPE_VMALLOC:
148 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
149 dmab->area = __vmalloc(size, gfp);
150 break;
151 #ifdef CONFIG_HAS_DMA
152 #ifdef CONFIG_GENERIC_ALLOCATOR
153 case SNDRV_DMA_TYPE_DEV_IRAM:
154 snd_malloc_dev_iram(dmab, size);
155 if (dmab->area)
156 break;
157 /* Internal memory might have limited size and no enough space,
158 * so if we fail to malloc, try to fetch memory traditionally.
159 */
160 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
161 fallthrough;
162 #endif /* CONFIG_GENERIC_ALLOCATOR */
163 case SNDRV_DMA_TYPE_DEV:
164 case SNDRV_DMA_TYPE_DEV_UC:
165 snd_malloc_dev_pages(dmab, size);
166 break;
167 #endif
168 #ifdef CONFIG_SND_DMA_SGBUF
169 case SNDRV_DMA_TYPE_DEV_SG:
170 case SNDRV_DMA_TYPE_DEV_UC_SG:
171 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
172 break;
173 #endif
174 default:
175 pr_err("snd-malloc: invalid device type %d\n", type);
176 return -ENXIO;
177 }
178 if (! dmab->area)
179 return -ENOMEM;
180 dmab->bytes = size;
181 return 0;
182 }
183 EXPORT_SYMBOL(snd_dma_alloc_pages);
184
185 /**
186 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
187 * @type: the DMA buffer type
188 * @device: the device pointer
189 * @size: the buffer size to allocate
190 * @dmab: buffer allocation record to store the allocated data
191 *
192 * Calls the memory-allocator function for the corresponding
193 * buffer type. When no space is left, this function reduces the size and
194 * tries to allocate again. The size actually allocated is stored in
195 * res_size argument.
196 *
197 * Return: Zero if the buffer with the given size is allocated successfully,
198 * otherwise a negative value on error.
199 */
snd_dma_alloc_pages_fallback(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)200 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
201 struct snd_dma_buffer *dmab)
202 {
203 int err;
204
205 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
206 if (err != -ENOMEM)
207 return err;
208 if (size <= PAGE_SIZE)
209 return -ENOMEM;
210 size >>= 1;
211 size = PAGE_SIZE << get_order(size);
212 }
213 if (! dmab->area)
214 return -ENOMEM;
215 return 0;
216 }
217 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
218
219
220 /**
221 * snd_dma_free_pages - release the allocated buffer
222 * @dmab: the buffer allocation record to release
223 *
224 * Releases the allocated buffer via snd_dma_alloc_pages().
225 */
snd_dma_free_pages(struct snd_dma_buffer * dmab)226 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
227 {
228 switch (dmab->dev.type) {
229 case SNDRV_DMA_TYPE_CONTINUOUS:
230 free_pages_exact(dmab->area, dmab->bytes);
231 break;
232 case SNDRV_DMA_TYPE_VMALLOC:
233 vfree(dmab->area);
234 break;
235 #ifdef CONFIG_HAS_DMA
236 #ifdef CONFIG_GENERIC_ALLOCATOR
237 case SNDRV_DMA_TYPE_DEV_IRAM:
238 snd_free_dev_iram(dmab);
239 break;
240 #endif /* CONFIG_GENERIC_ALLOCATOR */
241 case SNDRV_DMA_TYPE_DEV:
242 case SNDRV_DMA_TYPE_DEV_UC:
243 snd_free_dev_pages(dmab);
244 break;
245 #endif
246 #ifdef CONFIG_SND_DMA_SGBUF
247 case SNDRV_DMA_TYPE_DEV_SG:
248 case SNDRV_DMA_TYPE_DEV_UC_SG:
249 snd_free_sgbuf_pages(dmab);
250 break;
251 #endif
252 default:
253 pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
254 }
255 }
256 EXPORT_SYMBOL(snd_dma_free_pages);
257