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(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 */
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
snd_mem_get_gfp_flags(const struct device * dev,gfp_t default_gfp)103 static 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 */
snd_dma_alloc_pages(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)125 int 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 fallthrough;
161 #endif /* CONFIG_GENERIC_ALLOCATOR */
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 }
182 EXPORT_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 */
snd_dma_alloc_pages_fallback(int type,struct device * device,size_t size,struct snd_dma_buffer * dmab)199 int 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 }
216 EXPORT_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 */
snd_dma_free_pages(struct snd_dma_buffer * dmab)225 void 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 }
255 EXPORT_SYMBOL(snd_dma_free_pages);
256
