forked from Minki/linux
21956b61f5
After hours of debugging, I finally found the reason why some source and runtime combination does not work. The PTP (page table pages) address must be aligned. I am not sure how much, but alignment to PAGE_SIZE is sufficient. Also, use ALSA's page allocation routines to ensure proper virtual -> physical address translation. Cc: <stable@kernel.org> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/**
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* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
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*
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* This source file is released under GPL v2 license (no other versions).
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* See the COPYING file included in the main directory of this source
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* distribution for the license terms and conditions.
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*
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* @File ctvmem.h
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*
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* @Brief
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* This file contains the definition of virtual memory management object
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* for card device.
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*
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* @Author Liu Chun
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* @Date Mar 28 2008
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*/
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#ifndef CTVMEM_H
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#define CTVMEM_H
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#define CT_PTP_NUM 1 /* num of device page table pages */
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <sound/memalloc.h>
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/* The chip can handle the page table of 4k pages
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* (emu20k1 can handle even 8k pages, but we don't use it right now)
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*/
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#define CT_PAGE_SIZE 4096
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#define CT_PAGE_SHIFT 12
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#define CT_PAGE_MASK (~(PAGE_SIZE - 1))
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#define CT_PAGE_ALIGN(addr) ALIGN(addr, CT_PAGE_SIZE)
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struct ct_vm_block {
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unsigned int addr; /* starting logical addr of this block */
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unsigned int size; /* size of this device virtual mem block */
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struct list_head list;
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};
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struct snd_pcm_substream;
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/* Virtual memory management object for card device */
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struct ct_vm {
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struct snd_dma_buffer ptp[CT_PTP_NUM]; /* Device page table pages */
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unsigned int size; /* Available addr space in bytes */
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struct list_head unused; /* List of unused blocks */
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struct list_head used; /* List of used blocks */
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struct mutex lock;
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/* Map host addr (kmalloced/vmalloced) to device logical addr. */
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struct ct_vm_block *(*map)(struct ct_vm *, struct snd_pcm_substream *,
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int size);
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/* Unmap device logical addr area. */
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void (*unmap)(struct ct_vm *, struct ct_vm_block *block);
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dma_addr_t (*get_ptp_phys)(struct ct_vm *vm, int index);
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};
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int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci);
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void ct_vm_destroy(struct ct_vm *vm);
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#endif /* CTVMEM_H */
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