diff options
Diffstat (limited to 'sound/core/sgbuf.c')
| -rw-r--r-- | sound/core/sgbuf.c | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/sound/core/sgbuf.c b/sound/core/sgbuf.c deleted file mode 100644 index 29ddb76187e5..000000000000 --- a/sound/core/sgbuf.c +++ /dev/null @@ -1,163 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Scatter-Gather buffer - * - * Copyright (c) by Takashi Iwai <tiwai@suse.de> - */ - -#include <linux/slab.h> -#include <linux/mm.h> -#include <linux/vmalloc.h> -#include <linux/export.h> -#include <sound/memalloc.h> - - -/* table entries are align to 32 */ -#define SGBUF_TBL_ALIGN 32 -#define sgbuf_align_table(tbl) ALIGN((tbl), SGBUF_TBL_ALIGN) - -int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab) -{ - struct snd_sg_buf *sgbuf = dmab->private_data; - struct snd_dma_buffer tmpb; - int i; - - if (! sgbuf) - return -EINVAL; - - vunmap(dmab->area); - dmab->area = NULL; - - tmpb.dev.type = SNDRV_DMA_TYPE_DEV; - if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC_SG) - tmpb.dev.type = SNDRV_DMA_TYPE_DEV_UC; - tmpb.dev.dev = sgbuf->dev; - for (i = 0; i < sgbuf->pages; i++) { - if (!(sgbuf->table[i].addr & ~PAGE_MASK)) - continue; /* continuous pages */ - tmpb.area = sgbuf->table[i].buf; - tmpb.addr = sgbuf->table[i].addr & PAGE_MASK; - tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT; - snd_dma_free_pages(&tmpb); - } - - kfree(sgbuf->table); - kfree(sgbuf->page_table); - kfree(sgbuf); - dmab->private_data = NULL; - - return 0; -} - -#define MAX_ALLOC_PAGES 32 - -void *snd_malloc_sgbuf_pages(struct device *device, - size_t size, struct snd_dma_buffer *dmab, - size_t *res_size) -{ - struct snd_sg_buf *sgbuf; - unsigned int i, pages, chunk, maxpages; - struct snd_dma_buffer tmpb; - struct snd_sg_page *table; - struct page **pgtable; - int type = SNDRV_DMA_TYPE_DEV; - pgprot_t prot = PAGE_KERNEL; - - dmab->area = NULL; - dmab->addr = 0; - dmab->private_data = sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL); - if (! sgbuf) - return NULL; - if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC_SG) { - type = SNDRV_DMA_TYPE_DEV_UC; -#ifdef pgprot_noncached - prot = pgprot_noncached(PAGE_KERNEL); -#endif - } - sgbuf->dev = device; - pages = snd_sgbuf_aligned_pages(size); - sgbuf->tblsize = sgbuf_align_table(pages); - table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL); - if (!table) - goto _failed; - sgbuf->table = table; - pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL); - if (!pgtable) - goto _failed; - sgbuf->page_table = pgtable; - - /* allocate pages */ - maxpages = MAX_ALLOC_PAGES; - while (pages > 0) { - chunk = pages; - /* don't be too eager to take a huge chunk */ - if (chunk > maxpages) - chunk = maxpages; - chunk <<= PAGE_SHIFT; - if (snd_dma_alloc_pages_fallback(type, device, - chunk, &tmpb) < 0) { - if (!sgbuf->pages) - goto _failed; - if (!res_size) - goto _failed; - size = sgbuf->pages * PAGE_SIZE; - break; - } - chunk = tmpb.bytes >> PAGE_SHIFT; - for (i = 0; i < chunk; i++) { - table->buf = tmpb.area; - table->addr = tmpb.addr; - if (!i) - table->addr |= chunk; /* mark head */ - table++; - *pgtable++ = virt_to_page(tmpb.area); - tmpb.area += PAGE_SIZE; - tmpb.addr += PAGE_SIZE; - } - sgbuf->pages += chunk; - pages -= chunk; - if (chunk < maxpages) - maxpages = chunk; - } - - sgbuf->size = size; - dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, prot); - if (! dmab->area) - goto _failed; - if (res_size) - *res_size = sgbuf->size; - return dmab->area; - - _failed: - snd_free_sgbuf_pages(dmab); /* free the table */ - return NULL; -} - -/* - * compute the max chunk size with continuous pages on sg-buffer - */ -unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, - unsigned int ofs, unsigned int size) -{ - struct snd_sg_buf *sg = dmab->private_data; - unsigned int start, end, pg; - - if (!sg) - return size; - - start = ofs >> PAGE_SHIFT; - end = (ofs + size - 1) >> PAGE_SHIFT; - /* check page continuity */ - pg = sg->table[start].addr >> PAGE_SHIFT; - for (;;) { - start++; - if (start > end) - break; - pg++; - if ((sg->table[start].addr >> PAGE_SHIFT) != pg) - return (start << PAGE_SHIFT) - ofs; - } - /* ok, all on continuous pages */ - return size; -} -EXPORT_SYMBOL(snd_sgbuf_get_chunk_size); |