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-rw-r--r--sound/core/memalloc.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
new file mode 100644
index 000000000..966bef5ac
--- /dev/null
+++ b/sound/core/memalloc.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ * Takashi Iwai <tiwai@suse.de>
+ *
+ * Generic memory allocators
+ */
+
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/genalloc.h>
+#include <linux/vmalloc.h>
+#ifdef CONFIG_X86
+#include <asm/set_memory.h>
+#endif
+#include <sound/memalloc.h>
+
+/*
+ *
+ * Bus-specific memory allocators
+ *
+ */
+
+#ifdef CONFIG_HAS_DMA
+/* allocate the coherent DMA pages */
+static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
+{
+ gfp_t gfp_flags;
+
+ gfp_flags = GFP_KERNEL
+ | __GFP_COMP /* compound page lets parts be mapped */
+ | __GFP_NORETRY /* don't trigger OOM-killer */
+ | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
+ dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
+ gfp_flags);
+#ifdef CONFIG_X86
+ if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
+ set_memory_wc((unsigned long)dmab->area,
+ PAGE_ALIGN(size) >> PAGE_SHIFT);
+#endif
+}
+
+/* free the coherent DMA pages */
+static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
+{
+#ifdef CONFIG_X86
+ if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
+ set_memory_wb((unsigned long)dmab->area,
+ PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
+#endif
+ dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
+}
+
+#ifdef CONFIG_GENERIC_ALLOCATOR
+/**
+ * snd_malloc_dev_iram - allocate memory from on-chip internal ram
+ * @dmab: buffer allocation record to store the allocated data
+ * @size: number of bytes to allocate from the iram
+ *
+ * This function requires iram phandle provided via of_node
+ */
+static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
+{
+ struct device *dev = dmab->dev.dev;
+ struct gen_pool *pool = NULL;
+
+ dmab->area = NULL;
+ dmab->addr = 0;
+
+ if (dev->of_node)
+ pool = of_gen_pool_get(dev->of_node, "iram", 0);
+
+ if (!pool)
+ return;
+
+ /* Assign the pool into private_data field */
+ dmab->private_data = pool;
+
+ dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,
+ PAGE_SIZE);
+}
+
+/**
+ * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
+ * @dmab: buffer allocation record to store the allocated data
+ */
+static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
+{
+ struct gen_pool *pool = dmab->private_data;
+
+ if (pool && dmab->area)
+ gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
+}
+#endif /* CONFIG_GENERIC_ALLOCATOR */
+#endif /* CONFIG_HAS_DMA */
+
+/*
+ *
+ * ALSA generic memory management
+ *
+ */
+
+static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
+ gfp_t default_gfp)
+{
+ if (!dev)
+ return default_gfp;
+ else
+ return (__force gfp_t)(unsigned long)dev;
+}
+
+/**
+ * snd_dma_alloc_pages - allocate the buffer area according to the given type
+ * @type: the DMA buffer type
+ * @device: the device pointer
+ * @size: the buffer size to allocate
+ * @dmab: buffer allocation record to store the allocated data
+ *
+ * Calls the memory-allocator function for the corresponding
+ * buffer type.
+ *
+ * Return: Zero if the buffer with the given size is allocated successfully,
+ * otherwise a negative value on error.
+ */
+int snd_dma_alloc_pages(int type, struct device *device, size_t size,
+ struct snd_dma_buffer *dmab)
+{
+ gfp_t gfp;
+
+ if (WARN_ON(!size))
+ return -ENXIO;
+ if (WARN_ON(!dmab))
+ return -ENXIO;
+
+ size = PAGE_ALIGN(size);
+ dmab->dev.type = type;
+ dmab->dev.dev = device;
+ dmab->bytes = 0;
+ dmab->area = NULL;
+ dmab->addr = 0;
+ dmab->private_data = NULL;
+ switch (type) {
+ case SNDRV_DMA_TYPE_CONTINUOUS:
+ gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
+ dmab->area = alloc_pages_exact(size, gfp);
+ break;
+ case SNDRV_DMA_TYPE_VMALLOC:
+ gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
+ dmab->area = __vmalloc(size, gfp);
+ break;
+#ifdef CONFIG_HAS_DMA
+#ifdef CONFIG_GENERIC_ALLOCATOR
+ case SNDRV_DMA_TYPE_DEV_IRAM:
+ snd_malloc_dev_iram(dmab, size);
+ if (dmab->area)
+ break;
+ /* Internal memory might have limited size and no enough space,
+ * so if we fail to malloc, try to fetch memory traditionally.
+ */
+ dmab->dev.type = SNDRV_DMA_TYPE_DEV;
+ fallthrough;
+#endif /* CONFIG_GENERIC_ALLOCATOR */
+ case SNDRV_DMA_TYPE_DEV:
+ case SNDRV_DMA_TYPE_DEV_UC:
+ snd_malloc_dev_pages(dmab, size);
+ break;
+#endif
+#ifdef CONFIG_SND_DMA_SGBUF
+ case SNDRV_DMA_TYPE_DEV_SG:
+ case SNDRV_DMA_TYPE_DEV_UC_SG:
+ snd_malloc_sgbuf_pages(device, size, dmab, NULL);
+ break;
+#endif
+ default:
+ pr_err("snd-malloc: invalid device type %d\n", type);
+ return -ENXIO;
+ }
+ if (! dmab->area)
+ return -ENOMEM;
+ dmab->bytes = size;
+ return 0;
+}
+EXPORT_SYMBOL(snd_dma_alloc_pages);
+
+/**
+ * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
+ * @type: the DMA buffer type
+ * @device: the device pointer
+ * @size: the buffer size to allocate
+ * @dmab: buffer allocation record to store the allocated data
+ *
+ * Calls the memory-allocator function for the corresponding
+ * buffer type. When no space is left, this function reduces the size and
+ * tries to allocate again. The size actually allocated is stored in
+ * res_size argument.
+ *
+ * Return: Zero if the buffer with the given size is allocated successfully,
+ * otherwise a negative value on error.
+ */
+int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
+ struct snd_dma_buffer *dmab)
+{
+ int err;
+
+ while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
+ if (err != -ENOMEM)
+ return err;
+ if (size <= PAGE_SIZE)
+ return -ENOMEM;
+ size >>= 1;
+ size = PAGE_SIZE << get_order(size);
+ }
+ if (! dmab->area)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
+
+
+/**
+ * snd_dma_free_pages - release the allocated buffer
+ * @dmab: the buffer allocation record to release
+ *
+ * Releases the allocated buffer via snd_dma_alloc_pages().
+ */
+void snd_dma_free_pages(struct snd_dma_buffer *dmab)
+{
+ switch (dmab->dev.type) {
+ case SNDRV_DMA_TYPE_CONTINUOUS:
+ free_pages_exact(dmab->area, dmab->bytes);
+ break;
+ case SNDRV_DMA_TYPE_VMALLOC:
+ vfree(dmab->area);
+ break;
+#ifdef CONFIG_HAS_DMA
+#ifdef CONFIG_GENERIC_ALLOCATOR
+ case SNDRV_DMA_TYPE_DEV_IRAM:
+ snd_free_dev_iram(dmab);
+ break;
+#endif /* CONFIG_GENERIC_ALLOCATOR */
+ case SNDRV_DMA_TYPE_DEV:
+ case SNDRV_DMA_TYPE_DEV_UC:
+ snd_free_dev_pages(dmab);
+ break;
+#endif
+#ifdef CONFIG_SND_DMA_SGBUF
+ case SNDRV_DMA_TYPE_DEV_SG:
+ case SNDRV_DMA_TYPE_DEV_UC_SG:
+ snd_free_sgbuf_pages(dmab);
+ break;
+#endif
+ default:
+ pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
+ }
+}
+EXPORT_SYMBOL(snd_dma_free_pages);