Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 switch (type) {
139 case SNDRV_DMA_TYPE_CONTINUOUS:
140 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
141 dmab->area = alloc_pages_exact(size, gfp);
142 dmab->addr = 0;
143 break;
144 case SNDRV_DMA_TYPE_VMALLOC:
145 gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
146 dmab->area = __vmalloc(size, gfp, PAGE_KERNEL);
147 dmab->addr = 0;
148 break;
149#ifdef CONFIG_HAS_DMA
150#ifdef CONFIG_GENERIC_ALLOCATOR
151 case SNDRV_DMA_TYPE_DEV_IRAM:
152 snd_malloc_dev_iram(dmab, size);
153 if (dmab->area)
154 break;
155 /* Internal memory might have limited size and no enough space,
156 * so if we fail to malloc, try to fetch memory traditionally.
157 */
158 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
159#endif /* CONFIG_GENERIC_ALLOCATOR */
160 /* fall through */
161 case SNDRV_DMA_TYPE_DEV:
162 case SNDRV_DMA_TYPE_DEV_UC:
163 snd_malloc_dev_pages(dmab, size);
164 break;
165#endif
166#ifdef CONFIG_SND_DMA_SGBUF
167 case SNDRV_DMA_TYPE_DEV_SG:
168 case SNDRV_DMA_TYPE_DEV_UC_SG:
169 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
170 break;
171#endif
172 default:
173 pr_err("snd-malloc: invalid device type %d\n", type);
174 dmab->area = NULL;
175 dmab->addr = 0;
176 return -ENXIO;
177 }
178 if (! dmab->area)
179 return -ENOMEM;
180 dmab->bytes = size;
181 return 0;
182}
183EXPORT_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 */
200int 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}
217EXPORT_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 */
226void 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}
256EXPORT_SYMBOL(snd_dma_free_pages);