543 lines
13 KiB
C
543 lines
13 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Takashi Iwai <tiwai@suse.de>
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*
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* Generic memory allocators
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#include <linux/dma-mapping.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.h>
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#include <sound/memalloc.h>
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MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Memory allocator for ALSA system.");
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MODULE_LICENSE("GPL");
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/*
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*/
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static DEFINE_MUTEX(list_mutex);
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static LIST_HEAD(mem_list_head);
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/* buffer preservation list */
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struct snd_mem_list {
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struct snd_dma_buffer buffer;
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unsigned int id;
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struct list_head list;
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};
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/* id for pre-allocated buffers */
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#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
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/*
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*
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* Generic memory allocators
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*
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*/
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static long snd_allocated_pages; /* holding the number of allocated pages */
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static inline void inc_snd_pages(int order)
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{
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snd_allocated_pages += 1 << order;
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}
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static inline void dec_snd_pages(int order)
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{
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snd_allocated_pages -= 1 << order;
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}
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/**
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* snd_malloc_pages - allocate pages with the given size
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* @size: the size to allocate in bytes
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* @gfp_flags: the allocation conditions, GFP_XXX
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*
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* Allocates the physically contiguous pages with the given size.
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*
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* Returns the pointer of the buffer, or NULL if no enoguh memory.
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*/
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void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
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{
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int pg;
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void *res;
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if (WARN_ON(!size))
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return NULL;
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if (WARN_ON(!gfp_flags))
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return NULL;
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gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */
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pg = get_order(size);
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if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
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inc_snd_pages(pg);
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return res;
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}
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/**
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* snd_free_pages - release the pages
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* @ptr: the buffer pointer to release
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* @size: the allocated buffer size
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*
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* Releases the buffer allocated via snd_malloc_pages().
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*/
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void snd_free_pages(void *ptr, size_t size)
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{
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int pg;
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if (ptr == NULL)
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return;
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pg = get_order(size);
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dec_snd_pages(pg);
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free_pages((unsigned long) ptr, pg);
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}
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/*
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*
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* Bus-specific memory allocators
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*
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*/
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#ifdef CONFIG_HAS_DMA
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/* allocate the coherent DMA pages */
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static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
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{
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int pg;
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void *res;
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gfp_t gfp_flags;
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if (WARN_ON(!dma))
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return NULL;
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pg = get_order(size);
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gfp_flags = GFP_KERNEL
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| __GFP_COMP /* compound page lets parts be mapped */
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| __GFP_NORETRY /* don't trigger OOM-killer */
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| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
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res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
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if (res != NULL)
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inc_snd_pages(pg);
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return res;
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}
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/* free the coherent DMA pages */
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static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
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dma_addr_t dma)
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{
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int pg;
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if (ptr == NULL)
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return;
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pg = get_order(size);
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dec_snd_pages(pg);
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dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
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}
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#endif /* CONFIG_HAS_DMA */
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/*
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*
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* ALSA generic memory management
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*
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*/
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/**
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* snd_dma_alloc_pages - allocate the buffer area according to the given type
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* @type: the DMA buffer type
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* @device: the device pointer
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* @size: the buffer size to allocate
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* @dmab: buffer allocation record to store the allocated data
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*
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* Calls the memory-allocator function for the corresponding
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* buffer type.
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*
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* Returns zero if the buffer with the given size is allocated successfuly,
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* other a negative value at error.
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*/
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int snd_dma_alloc_pages(int type, struct device *device, size_t size,
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struct snd_dma_buffer *dmab)
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{
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if (WARN_ON(!size))
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return -ENXIO;
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if (WARN_ON(!dmab))
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return -ENXIO;
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dmab->dev.type = type;
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dmab->dev.dev = device;
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dmab->bytes = 0;
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switch (type) {
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case SNDRV_DMA_TYPE_CONTINUOUS:
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dmab->area = snd_malloc_pages(size, (unsigned long)device);
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dmab->addr = 0;
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break;
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#ifdef CONFIG_HAS_DMA
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case SNDRV_DMA_TYPE_DEV:
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dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
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break;
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case SNDRV_DMA_TYPE_DEV_SG:
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snd_malloc_sgbuf_pages(device, size, dmab, NULL);
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break;
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#endif
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default:
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printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
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dmab->area = NULL;
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dmab->addr = 0;
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return -ENXIO;
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}
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if (! dmab->area)
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return -ENOMEM;
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dmab->bytes = size;
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return 0;
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}
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/**
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* snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
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* @type: the DMA buffer type
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* @device: the device pointer
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* @size: the buffer size to allocate
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* @dmab: buffer allocation record to store the allocated data
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*
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* Calls the memory-allocator function for the corresponding
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* buffer type. When no space is left, this function reduces the size and
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* tries to allocate again. The size actually allocated is stored in
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* res_size argument.
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*
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* Returns zero if the buffer with the given size is allocated successfuly,
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* other a negative value at error.
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*/
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int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
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struct snd_dma_buffer *dmab)
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{
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int err;
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while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
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size_t aligned_size;
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if (err != -ENOMEM)
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return err;
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if (size <= PAGE_SIZE)
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return -ENOMEM;
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aligned_size = PAGE_SIZE << get_order(size);
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if (size != aligned_size)
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size = aligned_size;
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else
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size >>= 1;
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}
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if (! dmab->area)
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return -ENOMEM;
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return 0;
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}
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/**
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* snd_dma_free_pages - release the allocated buffer
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* @dmab: the buffer allocation record to release
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*
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* Releases the allocated buffer via snd_dma_alloc_pages().
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*/
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void snd_dma_free_pages(struct snd_dma_buffer *dmab)
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{
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switch (dmab->dev.type) {
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case SNDRV_DMA_TYPE_CONTINUOUS:
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snd_free_pages(dmab->area, dmab->bytes);
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break;
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#ifdef CONFIG_HAS_DMA
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case SNDRV_DMA_TYPE_DEV:
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snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
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break;
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case SNDRV_DMA_TYPE_DEV_SG:
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snd_free_sgbuf_pages(dmab);
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break;
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#endif
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default:
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printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
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}
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}
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/**
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* snd_dma_get_reserved - get the reserved buffer for the given device
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* @dmab: the buffer allocation record to store
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* @id: the buffer id
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*
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* Looks for the reserved-buffer list and re-uses if the same buffer
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* is found in the list. When the buffer is found, it's removed from the free list.
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*
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* Returns the size of buffer if the buffer is found, or zero if not found.
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*/
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size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
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{
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struct snd_mem_list *mem;
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if (WARN_ON(!dmab))
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return 0;
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mutex_lock(&list_mutex);
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list_for_each_entry(mem, &mem_list_head, list) {
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if (mem->id == id &&
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(mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
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! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
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struct device *dev = dmab->dev.dev;
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list_del(&mem->list);
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*dmab = mem->buffer;
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if (dmab->dev.dev == NULL)
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dmab->dev.dev = dev;
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kfree(mem);
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mutex_unlock(&list_mutex);
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return dmab->bytes;
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}
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}
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mutex_unlock(&list_mutex);
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return 0;
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}
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/**
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* snd_dma_reserve_buf - reserve the buffer
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* @dmab: the buffer to reserve
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* @id: the buffer id
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*
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* Reserves the given buffer as a reserved buffer.
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*
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* Returns zero if successful, or a negative code at error.
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*/
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int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
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{
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struct snd_mem_list *mem;
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if (WARN_ON(!dmab))
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return -EINVAL;
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mem = kmalloc(sizeof(*mem), GFP_KERNEL);
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if (! mem)
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return -ENOMEM;
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mutex_lock(&list_mutex);
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mem->buffer = *dmab;
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mem->id = id;
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list_add_tail(&mem->list, &mem_list_head);
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mutex_unlock(&list_mutex);
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return 0;
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}
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/*
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* purge all reserved buffers
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*/
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static void free_all_reserved_pages(void)
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{
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struct list_head *p;
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struct snd_mem_list *mem;
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mutex_lock(&list_mutex);
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while (! list_empty(&mem_list_head)) {
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p = mem_list_head.next;
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mem = list_entry(p, struct snd_mem_list, list);
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list_del(p);
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snd_dma_free_pages(&mem->buffer);
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kfree(mem);
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}
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mutex_unlock(&list_mutex);
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}
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#ifdef CONFIG_PROC_FS
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/*
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* proc file interface
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*/
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#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
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static struct proc_dir_entry *snd_mem_proc;
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static int snd_mem_proc_read(struct seq_file *seq, void *offset)
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{
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long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
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struct snd_mem_list *mem;
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int devno;
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static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG" };
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mutex_lock(&list_mutex);
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seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n",
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pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
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devno = 0;
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list_for_each_entry(mem, &mem_list_head, list) {
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devno++;
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seq_printf(seq, "buffer %d : ID %08x : type %s\n",
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devno, mem->id, types[mem->buffer.dev.type]);
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seq_printf(seq, " addr = 0x%lx, size = %d bytes\n",
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(unsigned long)mem->buffer.addr,
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(int)mem->buffer.bytes);
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}
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mutex_unlock(&list_mutex);
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return 0;
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}
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static int snd_mem_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, snd_mem_proc_read, NULL);
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}
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/* FIXME: for pci only - other bus? */
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#ifdef CONFIG_PCI
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#define gettoken(bufp) strsep(bufp, " \t\n")
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static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
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size_t count, loff_t * ppos)
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{
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char buf[128];
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char *token, *p;
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if (count > sizeof(buf) - 1)
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return -EINVAL;
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if (copy_from_user(buf, buffer, count))
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return -EFAULT;
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buf[count] = '\0';
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p = buf;
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token = gettoken(&p);
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if (! token || *token == '#')
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return count;
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if (strcmp(token, "add") == 0) {
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char *endp;
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int vendor, device, size, buffers;
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long mask;
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int i, alloced;
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struct pci_dev *pci;
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if ((token = gettoken(&p)) == NULL ||
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(vendor = simple_strtol(token, NULL, 0)) <= 0 ||
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(token = gettoken(&p)) == NULL ||
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(device = simple_strtol(token, NULL, 0)) <= 0 ||
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(token = gettoken(&p)) == NULL ||
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(mask = simple_strtol(token, NULL, 0)) < 0 ||
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(token = gettoken(&p)) == NULL ||
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(size = memparse(token, &endp)) < 64*1024 ||
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size > 16*1024*1024 /* too big */ ||
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(token = gettoken(&p)) == NULL ||
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(buffers = simple_strtol(token, NULL, 0)) <= 0 ||
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buffers > 4) {
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printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
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return count;
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}
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vendor &= 0xffff;
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device &= 0xffff;
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alloced = 0;
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pci = NULL;
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while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
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if (mask > 0 && mask < 0xffffffff) {
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if (pci_set_dma_mask(pci, mask) < 0 ||
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pci_set_consistent_dma_mask(pci, mask) < 0) {
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printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
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pci_dev_put(pci);
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return count;
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}
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}
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for (i = 0; i < buffers; i++) {
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struct snd_dma_buffer dmab;
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memset(&dmab, 0, sizeof(dmab));
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if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
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size, &dmab) < 0) {
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printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
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pci_dev_put(pci);
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return count;
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}
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snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
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}
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alloced++;
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}
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if (! alloced) {
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for (i = 0; i < buffers; i++) {
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struct snd_dma_buffer dmab;
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memset(&dmab, 0, sizeof(dmab));
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/* FIXME: We can allocate only in ZONE_DMA
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* without a device pointer!
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*/
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if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
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size, &dmab) < 0) {
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printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
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break;
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}
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snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
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}
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}
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} else if (strcmp(token, "erase") == 0)
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/* FIXME: need for releasing each buffer chunk? */
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free_all_reserved_pages();
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else
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printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
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return count;
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}
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#endif /* CONFIG_PCI */
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static const struct file_operations snd_mem_proc_fops = {
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.owner = THIS_MODULE,
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.open = snd_mem_proc_open,
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.read = seq_read,
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#ifdef CONFIG_PCI
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.write = snd_mem_proc_write,
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#endif
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif /* CONFIG_PROC_FS */
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/*
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* module entry
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*/
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static int __init snd_mem_init(void)
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{
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#ifdef CONFIG_PROC_FS
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snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
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&snd_mem_proc_fops);
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#endif
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return 0;
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}
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static void __exit snd_mem_exit(void)
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{
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remove_proc_entry(SND_MEM_PROC_FILE, NULL);
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free_all_reserved_pages();
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if (snd_allocated_pages > 0)
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printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages);
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}
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module_init(snd_mem_init)
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module_exit(snd_mem_exit)
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/*
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* exports
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*/
|
|
EXPORT_SYMBOL(snd_dma_alloc_pages);
|
|
EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
|
|
EXPORT_SYMBOL(snd_dma_free_pages);
|
|
|
|
EXPORT_SYMBOL(snd_dma_get_reserved_buf);
|
|
EXPORT_SYMBOL(snd_dma_reserve_buf);
|
|
|
|
EXPORT_SYMBOL(snd_malloc_pages);
|
|
EXPORT_SYMBOL(snd_free_pages);
|