[linux-2.6-block.git] / sound / pci / emu10k1 / memory.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *
 *  EMU10K1 memory page allocation (PTB area)
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/time.h>
#include <linux/mutex.h>
#include <linux/export.h>

#include <sound/core.h>
#include <sound/emu10k1.h>

/* page arguments of these two macros are Emu page (4096 bytes), not like
 * aligned pages in others
 */
#define __set_ptb_entry(emu,page,addr) \
	(((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << (emu->address_mode)) | (page)))

#define UNIT_PAGES		(PAGE_SIZE / EMUPAGESIZE)
#define MAX_ALIGN_PAGES0		(MAXPAGES0 / UNIT_PAGES)
#define MAX_ALIGN_PAGES1		(MAXPAGES1 / UNIT_PAGES)
/* get aligned page from offset address */
#define get_aligned_page(offset)	((offset) >> PAGE_SHIFT)
/* get offset address from aligned page */
#define aligned_page_offset(page)	((page) << PAGE_SHIFT)

#if PAGE_SIZE == 4096
/* page size == EMUPAGESIZE */
/* fill PTB entrie(s) corresponding to page with addr */
#define set_ptb_entry(emu,page,addr)	__set_ptb_entry(emu,page,addr)
/* fill PTB entrie(s) corresponding to page with silence pointer */
#define set_silent_ptb(emu,page)	__set_ptb_entry(emu,page,emu->silent_page.addr)
#else
/* fill PTB entries -- we need to fill UNIT_PAGES entries */
static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
{
	int i;
	page *= UNIT_PAGES;
	for (i = 0; i < UNIT_PAGES; i++, page++) {
		__set_ptb_entry(emu, page, addr);
		addr += EMUPAGESIZE;
	}
}
static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
{
	int i;
	page *= UNIT_PAGES;
	for (i = 0; i < UNIT_PAGES; i++, page++)
		/* do not increment ptr */
		__set_ptb_entry(emu, page, emu->silent_page.addr);
}
#endif /* PAGE_SIZE */


/*
 */
static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);

#define get_emu10k1_memblk(l,member)	list_entry(l, struct snd_emu10k1_memblk, member)


/* initialize emu10k1 part */
static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
{
	blk->mapped_page = -1;
	INIT_LIST_HEAD(&blk->mapped_link);
	INIT_LIST_HEAD(&blk->mapped_order_link);
	blk->map_locked = 0;

	blk->first_page = get_aligned_page(blk->mem.offset);
	blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
	blk->pages = blk->last_page - blk->first_page + 1;
}

/*
 * search empty region on PTB with the given size
 *
 * if an empty region is found, return the page and store the next mapped block
 * in nextp
 * if not found, return a negative error code.
 */
static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
{
	int page = 0, found_page = -ENOMEM;
	int max_size = npages;
	int size;
	struct list_head *candidate = &emu->mapped_link_head;
	struct list_head *pos;

	list_for_each (pos, &emu->mapped_link_head) {
		struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
		if (blk->mapped_page < 0)
			continue;
		size = blk->mapped_page - page;
		if (size == npages) {
			*nextp = pos;
			return page;
		}
		else if (size > max_size) {
			/* we look for the maximum empty hole */
			max_size = size;
			candidate = pos;
			found_page = page;
		}
		page = blk->mapped_page + blk->pages;
	}
	size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page;
	if (size >= max_size) {
		*nextp = pos;
		return page;
	}
	*nextp = candidate;
	return found_page;
}

/*
 * map a memory block onto emu10k1's PTB
 *
 * call with memblk_lock held
 */
static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
	int page, pg;
	struct list_head *next;

	page = search_empty_map_area(emu, blk->pages, &next);
	if (page < 0) /* not found */
		return page;
	/* insert this block in the proper position of mapped list */
	list_add_tail(&blk->mapped_link, next);
	/* append this as a newest block in order list */
	list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
	blk->mapped_page = page;
	/* fill PTB */
	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
		set_ptb_entry(emu, page, emu->page_addr_table[pg]);
		page++;
	}
	return 0;
}

/*
 * unmap the block
 * return the size of resultant empty pages
 *
 * call with memblk_lock held
 */
static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
	int start_page, end_page, mpage, pg;
	struct list_head *p;
	struct snd_emu10k1_memblk *q;

	/* calculate the expected size of empty region */
	if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
		q = get_emu10k1_memblk(p, mapped_link);
		start_page = q->mapped_page + q->pages;
	} else
		start_page = 0;
	if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
		q = get_emu10k1_memblk(p, mapped_link);
		end_page = q->mapped_page;
	} else
		end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0);

	/* remove links */
	list_del(&blk->mapped_link);
	list_del(&blk->mapped_order_link);
	/* clear PTB */
	mpage = blk->mapped_page;
	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
		set_silent_ptb(emu, mpage);
		mpage++;
	}
	blk->mapped_page = -1;
	return end_page - start_page; /* return the new empty size */
}

/*
 * search empty pages with the given size, and create a memory block
 *
 * unlike synth_alloc the memory block is aligned to the page start
 */
static struct snd_emu10k1_memblk *
search_empty(struct snd_emu10k1 *emu, int size)
{
	struct list_head *p;
	struct snd_emu10k1_memblk *blk;
	int page, psize;

	psize = get_aligned_page(size + PAGE_SIZE -1);
	page = 0;
	list_for_each(p, &emu->memhdr->block) {
		blk = get_emu10k1_memblk(p, mem.list);
		if (page + psize <= blk->first_page)
			goto __found_pages;
		page = blk->last_page + 1;
	}
	if (page + psize > emu->max_cache_pages)
		return NULL;

__found_pages:
	/* create a new memory block */
	blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
	if (blk == NULL)
		return NULL;
	blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
	emu10k1_memblk_init(blk);
	return blk;
}


/*
 * check if the given pointer is valid for pages
 */
static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
{
	if (addr & ~emu->dma_mask) {
		dev_err(emu->card->dev,
			"max memory size is 0x%lx (addr = 0x%lx)!!\n",
			emu->dma_mask, (unsigned long)addr);
		return 0;
	}
	if (addr & (EMUPAGESIZE-1)) {
		dev_err(emu->card->dev, "page is not aligned\n");
		return 0;
	}
	return 1;
}

/*
 * map the given memory block on PTB.
 * if the block is already mapped, update the link order.
 * if no empty pages are found, tries to release unused memory blocks
 * and retry the mapping.
 */
int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
	int err;
	int size;
	struct list_head *p, *nextp;
	struct snd_emu10k1_memblk *deleted;
	unsigned long flags;

	spin_lock_irqsave(&emu->memblk_lock, flags);
	if (blk->mapped_page >= 0) {
		/* update order link */
		list_move_tail(&blk->mapped_order_link,
			       &emu->mapped_order_link_head);
		spin_unlock_irqrestore(&emu->memblk_lock, flags);
		return 0;
	}
	if ((err = map_memblk(emu, blk)) < 0) {
		/* no enough page - try to unmap some blocks */
		/* starting from the oldest block */
		p = emu->mapped_order_link_head.next;
		for (; p != &emu->mapped_order_link_head; p = nextp) {
			nextp = p->next;
			deleted = get_emu10k1_memblk(p, mapped_order_link);
			if (deleted->map_locked)
				continue;
			size = unmap_memblk(emu, deleted);
			if (size >= blk->pages) {
				/* ok the empty region is enough large */
				err = map_memblk(emu, blk);
				break;
			}
		}
	}
	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	return err;
}

EXPORT_SYMBOL(snd_emu10k1_memblk_map);

/*
 * page allocation for DMA
 */
struct snd_util_memblk *
snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_util_memhdr *hdr;
	struct snd_emu10k1_memblk *blk;
	int page, err, idx;

	if (snd_BUG_ON(!emu))
		return NULL;
	if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
		       runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE))
		return NULL;
	hdr = emu->memhdr;
	if (snd_BUG_ON(!hdr))
		return NULL;

	idx = runtime->period_size >= runtime->buffer_size ?
					(emu->delay_pcm_irq * 2) : 0;
	mutex_lock(&hdr->block_mutex);
	blk = search_empty(emu, runtime->dma_bytes + idx);
	if (blk == NULL) {
		mutex_unlock(&hdr->block_mutex);
		return NULL;
	}
	/* fill buffer addresses but pointers are not stored so that
	 * snd_free_pci_page() is not called in in synth_free()
	 */
	idx = 0;
	for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
		unsigned long ofs = idx << PAGE_SHIFT;
		dma_addr_t addr;
		if (ofs >= runtime->dma_bytes)
			addr = emu->silent_page.addr;
		else
			addr = snd_pcm_sgbuf_get_addr(substream, ofs);
		if (! is_valid_page(emu, addr)) {
			dev_err(emu->card->dev,
				"emu: failure page = %d\n", idx);
			mutex_unlock(&hdr->block_mutex);
			return NULL;
		}
		emu->page_addr_table[page] = addr;
		emu->page_ptr_table[page] = NULL;
	}

	/* set PTB entries */
	blk->map_locked = 1; /* do not unmap this block! */
	err = snd_emu10k1_memblk_map(emu, blk);
	if (err < 0) {
		__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
		mutex_unlock(&hdr->block_mutex);
		return NULL;
	}
	mutex_unlock(&hdr->block_mutex);
	return (struct snd_util_memblk *)blk;
}


/*
 * release DMA buffer from page table
 */
int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
{
	if (snd_BUG_ON(!emu || !blk))
		return -EINVAL;
	return snd_emu10k1_synth_free(emu, blk);
}


/*
 * memory allocation using multiple pages (for synth)
 * Unlike the DMA allocation above, non-contiguous pages are assined.
 */

/*
 * allocate a synth sample area
 */
struct snd_util_memblk *
snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
{
	struct snd_emu10k1_memblk *blk;
	struct snd_util_memhdr *hdr = hw->memhdr; 

	mutex_lock(&hdr->block_mutex);
	blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
	if (blk == NULL) {
		mutex_unlock(&hdr->block_mutex);
		return NULL;
	}
	if (synth_alloc_pages(hw, blk)) {
		__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
		mutex_unlock(&hdr->block_mutex);
		return NULL;
	}
	snd_emu10k1_memblk_map(hw, blk);
	mutex_unlock(&hdr->block_mutex);
	return (struct snd_util_memblk *)blk;
}

EXPORT_SYMBOL(snd_emu10k1_synth_alloc);

/*
 * free a synth sample area
 */
int
snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
{
	struct snd_util_memhdr *hdr = emu->memhdr; 
	struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
	unsigned long flags;

	mutex_lock(&hdr->block_mutex);
	spin_lock_irqsave(&emu->memblk_lock, flags);
	if (blk->mapped_page >= 0)
		unmap_memblk(emu, blk);
	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	synth_free_pages(emu, blk);
	 __snd_util_mem_free(hdr, memblk);
	mutex_unlock(&hdr->block_mutex);
	return 0;
}

EXPORT_SYMBOL(snd_emu10k1_synth_free);

/* check new allocation range */
static void get_single_page_range(struct snd_util_memhdr *hdr,
				  struct snd_emu10k1_memblk *blk,
				  int *first_page_ret, int *last_page_ret)
{
	struct list_head *p;
	struct snd_emu10k1_memblk *q;
	int first_page, last_page;
	first_page = blk->first_page;
	if ((p = blk->mem.list.prev) != &hdr->block) {
		q = get_emu10k1_memblk(p, mem.list);
		if (q->last_page == first_page)
			first_page++;  /* first page was already allocated */
	}
	last_page = blk->last_page;
	if ((p = blk->mem.list.next) != &hdr->block) {
		q = get_emu10k1_memblk(p, mem.list);
		if (q->first_page == last_page)
			last_page--; /* last page was already allocated */
	}
	*first_page_ret = first_page;
	*last_page_ret = last_page;
}

/* release allocated pages */
static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
			       int last_page)
{
	int page;

	for (page = first_page; page <= last_page; page++) {
		free_page((unsigned long)emu->page_ptr_table[page]);
		emu->page_addr_table[page] = 0;
		emu->page_ptr_table[page] = NULL;
	}
}

/*
 * allocate kernel pages
 */
static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
	int page, first_page, last_page;

	emu10k1_memblk_init(blk);
	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
	/* allocate kernel pages */
	for (page = first_page; page <= last_page; page++) {
		/* first try to allocate from <4GB zone */
		struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
					    __GFP_NOWARN);
		if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
			if (p)
				__free_page(p);
			/* try to allocate from <16MB zone */
			p = alloc_page(GFP_ATOMIC | GFP_DMA |
				       __GFP_NORETRY | /* no OOM-killer */
				       __GFP_NOWARN);
		}
		if (!p) {
			__synth_free_pages(emu, first_page, page - 1);
			return -ENOMEM;
		}
		emu->page_addr_table[page] = page_to_phys(p);
		emu->page_ptr_table[page] = page_address(p);
	}
	return 0;
}

/*
 * free pages
 */
static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
	int first_page, last_page;

	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
	__synth_free_pages(emu, first_page, last_page);
	return 0;
}

/* calculate buffer pointer from offset address */
static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
{
	char *ptr;
	if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
		return NULL;
	ptr = emu->page_ptr_table[page];
	if (! ptr) {
		dev_err(emu->card->dev,
			"access to NULL ptr: page = %d\n", page);
		return NULL;
	}
	ptr += offset & (PAGE_SIZE - 1);
	return (void*)ptr;
}

/*
 * bzero(blk + offset, size)
 */
int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
			    int offset, int size)
{
	int page, nextofs, end_offset, temp, temp1;
	void *ptr;
	struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;

	offset += blk->offset & (PAGE_SIZE - 1);
	end_offset = offset + size;
	page = get_aligned_page(offset);
	do {
		nextofs = aligned_page_offset(page + 1);
		temp = nextofs - offset;
		temp1 = end_offset - offset;
		if (temp1 < temp)
			temp = temp1;
		ptr = offset_ptr(emu, page + p->first_page, offset);
		if (ptr)
			memset(ptr, 0, temp);
		offset = nextofs;
		page++;
	} while (offset < end_offset);
	return 0;
}

EXPORT_SYMBOL(snd_emu10k1_synth_bzero);

/*
 * copy_from_user(blk + offset, data, size)
 */
int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
				     int offset, const char __user *data, int size)
{
	int page, nextofs, end_offset, temp, temp1;
	void *ptr;
	struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;

	offset += blk->offset & (PAGE_SIZE - 1);
	end_offset = offset + size;
	page = get_aligned_page(offset);
	do {
		nextofs = aligned_page_offset(page + 1);
		temp = nextofs - offset;
		temp1 = end_offset - offset;
		if (temp1 < temp)
			temp = temp1;
		ptr = offset_ptr(emu, page + p->first_page, offset);
		if (ptr && copy_from_user(ptr, data, temp))
			return -EFAULT;
		offset = nextofs;
		data += temp;
		page++;
	} while (offset < end_offset);
	return 0;
}

EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);
Commit	Line	Data
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	3	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	4	*
	5	* EMU10K1 memory page allocation (PTB area)
	6	*
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	*/
	23
1da177e4	24	#include <linux/pci.h>
5a0e3ad6	25	#include <linux/gfp.h>
1da177e4	26	#include <linux/time.h>
62932df8	27	#include <linux/mutex.h>
d81a6d71	28	#include <linux/export.h>
62932df8	29
1da177e4 LT	30	#include <sound/core.h>
	31	#include <sound/emu10k1.h>
	32
	33	/* page arguments of these two macros are Emu page (4096 bytes), not like
	34	* aligned pages in others
	35	*/
	36	#define __set_ptb_entry(emu,page,addr) \
7241ea55	37	(((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << (emu->address_mode)) \| (page)))
1da177e4 LT	38
1da177e4 LT	39	#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE)
7241ea55 PZ	40	#define MAX_ALIGN_PAGES0 (MAXPAGES0 / UNIT_PAGES)
7241ea55 PZ	41	#define MAX_ALIGN_PAGES1 (MAXPAGES1 / UNIT_PAGES)
1da177e4 LT	42	/* get aligned page from offset address */
	43	#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT)
	44	/* get offset address from aligned page */
	45	#define aligned_page_offset(page) ((page) << PAGE_SHIFT)
	46
	47	#if PAGE_SIZE == 4096
	48	/* page size == EMUPAGESIZE */
	49	/* fill PTB entrie(s) corresponding to page with addr */
	50	#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr)
	51	/* fill PTB entrie(s) corresponding to page with silence pointer */
	52	#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr)
	53	#else
	54	/* fill PTB entries -- we need to fill UNIT_PAGES entries */
eb4698f3	55	static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
1da177e4 LT	56	{
	57	int i;
	58	page *= UNIT_PAGES;
	59	for (i = 0; i < UNIT_PAGES; i++, page++) {
	60	__set_ptb_entry(emu, page, addr);
	61	addr += EMUPAGESIZE;
	62	}
	63	}
eb4698f3	64	static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
1da177e4 LT	65	{
	66	int i;
	67	page *= UNIT_PAGES;
	68	for (i = 0; i < UNIT_PAGES; i++, page++)
	69	/* do not increment ptr */
	70	__set_ptb_entry(emu, page, emu->silent_page.addr);
	71	}
	72	#endif /* PAGE_SIZE */
	73
	74
	75	/*
	76	*/
eb4698f3 TI	77	static int synth_alloc_pages(struct snd_emu10k1 hw, struct snd_emu10k1_memblk blk);
eb4698f3 TI	78	static int synth_free_pages(struct snd_emu10k1 hw, struct snd_emu10k1_memblk blk);
1da177e4	79
eb4698f3	80	#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
1da177e4 LT	81
	82
	83	/* initialize emu10k1 part */
eb4698f3	84	static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
1da177e4 LT	85	{
	86	blk->mapped_page = -1;
	87	INIT_LIST_HEAD(&blk->mapped_link);
	88	INIT_LIST_HEAD(&blk->mapped_order_link);
	89	blk->map_locked = 0;
	90
	91	blk->first_page = get_aligned_page(blk->mem.offset);
	92	blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
	93	blk->pages = blk->last_page - blk->first_page + 1;
	94	}
	95
	96	/*
	97	* search empty region on PTB with the given size
	98	*
	99	* if an empty region is found, return the page and store the next mapped block
	100	* in nextp
	101	* if not found, return a negative error code.
	102	*/
eb4698f3	103	static int search_empty_map_area(struct snd_emu10k1 emu, int npages, struct list_head *nextp)
1da177e4 LT	104	{
	105	int page = 0, found_page = -ENOMEM;
	106	int max_size = npages;
	107	int size;
	108	struct list_head *candidate = &emu->mapped_link_head;
	109	struct list_head *pos;
	110
	111	list_for_each (pos, &emu->mapped_link_head) {
eb4698f3	112	struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
da3cec35 TI	113	if (blk->mapped_page < 0)
da3cec35 TI	114	continue;
1da177e4 LT	115	size = blk->mapped_page - page;
	116	if (size == npages) {
	117	*nextp = pos;
	118	return page;
	119	}
	120	else if (size > max_size) {
	121	/* we look for the maximum empty hole */
	122	max_size = size;
	123	candidate = pos;
	124	found_page = page;
	125	}
	126	page = blk->mapped_page + blk->pages;
	127	}
7241ea55	128	size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page;
1da177e4 LT	129	if (size >= max_size) {
	130	*nextp = pos;
	131	return page;
	132	}
	133	*nextp = candidate;
	134	return found_page;
	135	}
	136
	137	/*
	138	* map a memory block onto emu10k1's PTB
	139	*
	140	* call with memblk_lock held
	141	*/
eb4698f3	142	static int map_memblk(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	143	{
	144	int page, pg;
	145	struct list_head *next;
	146
	147	page = search_empty_map_area(emu, blk->pages, &next);
	148	if (page < 0) /* not found */
	149	return page;
	150	/* insert this block in the proper position of mapped list */
	151	list_add_tail(&blk->mapped_link, next);
	152	/* append this as a newest block in order list */
	153	list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
	154	blk->mapped_page = page;
	155	/* fill PTB */
	156	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
	157	set_ptb_entry(emu, page, emu->page_addr_table[pg]);
	158	page++;
	159	}
	160	return 0;
	161	}
	162
	163	/*
	164	* unmap the block
	165	* return the size of resultant empty pages
	166	*
	167	* call with memblk_lock held
	168	*/
eb4698f3	169	static int unmap_memblk(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	170	{
	171	int start_page, end_page, mpage, pg;
	172	struct list_head *p;
eb4698f3	173	struct snd_emu10k1_memblk *q;
1da177e4 LT	174
	175	/* calculate the expected size of empty region */
	176	if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
	177	q = get_emu10k1_memblk(p, mapped_link);
	178	start_page = q->mapped_page + q->pages;
	179	} else
	180	start_page = 0;
	181	if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
	182	q = get_emu10k1_memblk(p, mapped_link);
	183	end_page = q->mapped_page;
	184	} else
7241ea55	185	end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0);
1da177e4 LT	186
	187	/* remove links */
	188	list_del(&blk->mapped_link);
	189	list_del(&blk->mapped_order_link);
	190	/* clear PTB */
	191	mpage = blk->mapped_page;
	192	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
	193	set_silent_ptb(emu, mpage);
	194	mpage++;
	195	}
	196	blk->mapped_page = -1;
	197	return end_page - start_page; /* return the new empty size */
	198	}
	199
	200	/*
	201	* search empty pages with the given size, and create a memory block
	202	*
	203	* unlike synth_alloc the memory block is aligned to the page start
	204	*/
eb4698f3 TI	205	static struct snd_emu10k1_memblk *
eb4698f3 TI	206	search_empty(struct snd_emu10k1 *emu, int size)
1da177e4 LT	207	{
1da177e4 LT	208	struct list_head *p;
eb4698f3	209	struct snd_emu10k1_memblk *blk;
1da177e4 LT	210	int page, psize;
	211
	212	psize = get_aligned_page(size + PAGE_SIZE -1);
	213	page = 0;
	214	list_for_each(p, &emu->memhdr->block) {
	215	blk = get_emu10k1_memblk(p, mem.list);
	216	if (page + psize <= blk->first_page)
	217	goto __found_pages;
	218	page = blk->last_page + 1;
	219	}
	220	if (page + psize > emu->max_cache_pages)
	221	return NULL;
	222
	223	__found_pages:
	224	/* create a new memory block */
eb4698f3	225	blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
1da177e4 LT	226	if (blk == NULL)
	227	return NULL;
	228	blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
	229	emu10k1_memblk_init(blk);
	230	return blk;
	231	}
	232
	233
	234	/*
	235	* check if the given pointer is valid for pages
	236	*/
eb4698f3	237	static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
1da177e4 LT	238	{
1da177e4 LT	239	if (addr & ~emu->dma_mask) {
6f002b02 TI	240	dev_err(emu->card->dev,
	241	"max memory size is 0x%lx (addr = 0x%lx)!!\n",
	242	emu->dma_mask, (unsigned long)addr);
1da177e4 LT	243	return 0;
	244	}
	245	if (addr & (EMUPAGESIZE-1)) {
6f002b02	246	dev_err(emu->card->dev, "page is not aligned\n");
1da177e4 LT	247	return 0;
	248	}
	249	return 1;
	250	}
	251
	252	/*
	253	* map the given memory block on PTB.
	254	* if the block is already mapped, update the link order.
25985edc	255	* if no empty pages are found, tries to release unused memory blocks
1da177e4 LT	256	* and retry the mapping.
1da177e4 LT	257	*/
eb4698f3	258	int snd_emu10k1_memblk_map(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	259	{
	260	int err;
	261	int size;
	262	struct list_head p, nextp;
eb4698f3	263	struct snd_emu10k1_memblk *deleted;
1da177e4 LT	264	unsigned long flags;
	265
	266	spin_lock_irqsave(&emu->memblk_lock, flags);
	267	if (blk->mapped_page >= 0) {
	268	/* update order link */
292f2b62 WY	269	list_move_tail(&blk->mapped_order_link,
292f2b62 WY	270	&emu->mapped_order_link_head);
1da177e4 LT	271	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	272	return 0;
	273	}
	274	if ((err = map_memblk(emu, blk)) < 0) {
	275	/* no enough page - try to unmap some blocks */
	276	/* starting from the oldest block */
	277	p = emu->mapped_order_link_head.next;
	278	for (; p != &emu->mapped_order_link_head; p = nextp) {
	279	nextp = p->next;
	280	deleted = get_emu10k1_memblk(p, mapped_order_link);
	281	if (deleted->map_locked)
	282	continue;
	283	size = unmap_memblk(emu, deleted);
	284	if (size >= blk->pages) {
	285	/* ok the empty region is enough large */
	286	err = map_memblk(emu, blk);
	287	break;
	288	}
	289	}
	290	}
	291	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	292	return err;
	293	}
	294
2dd31dee TI	295	EXPORT_SYMBOL(snd_emu10k1_memblk_map);
2dd31dee TI	296
1da177e4 LT	297	/*
	298	* page allocation for DMA
	299	*/
eb4698f3 TI	300	struct snd_util_memblk *
eb4698f3 TI	301	snd_emu10k1_alloc_pages(struct snd_emu10k1 emu, struct snd_pcm_substream substream)
1da177e4	302	{
eb4698f3	303	struct snd_pcm_runtime *runtime = substream->runtime;
eb4698f3 TI	304	struct snd_util_memhdr *hdr;
eb4698f3 TI	305	struct snd_emu10k1_memblk *blk;
1da177e4 LT	306	int page, err, idx;
1da177e4 LT	307
da3cec35 TI	308	if (snd_BUG_ON(!emu))
	309	return NULL;
	310	if (snd_BUG_ON(runtime->dma_bytes <= 0 \|\|
7241ea55	311	runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE))
da3cec35	312	return NULL;
1da177e4	313	hdr = emu->memhdr;
da3cec35 TI	314	if (snd_BUG_ON(!hdr))
da3cec35 TI	315	return NULL;
1da177e4	316
56385a12 JK	317	idx = runtime->period_size >= runtime->buffer_size ?
56385a12 JK	318	(emu->delay_pcm_irq * 2) : 0;
62932df8	319	mutex_lock(&hdr->block_mutex);
56385a12	320	blk = search_empty(emu, runtime->dma_bytes + idx);
1da177e4	321	if (blk == NULL) {
62932df8	322	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	323	return NULL;
	324	}
	325	/* fill buffer addresses but pointers are not stored so that
	326	* snd_free_pci_page() is not called in in synth_free()
	327	*/
	328	idx = 0;
	329	for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
77a23f26	330	unsigned long ofs = idx << PAGE_SHIFT;
1da177e4	331	dma_addr_t addr;
fcfb7866 TI	332	if (ofs >= runtime->dma_bytes)
	333	addr = emu->silent_page.addr;
	334	else
	335	addr = snd_pcm_sgbuf_get_addr(substream, ofs);
1da177e4	336	if (! is_valid_page(emu, addr)) {
6f002b02 TI	337	dev_err(emu->card->dev,
6f002b02 TI	338	"emu: failure page = %d\n", idx);
62932df8	339	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	340	return NULL;
	341	}
	342	emu->page_addr_table[page] = addr;
	343	emu->page_ptr_table[page] = NULL;
	344	}
	345
	346	/* set PTB entries */
	347	blk->map_locked = 1; /* do not unmap this block! */
	348	err = snd_emu10k1_memblk_map(emu, blk);
	349	if (err < 0) {
eb4698f3	350	__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
62932df8	351	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	352	return NULL;
1da177e4 LT	353	}
62932df8	354	mutex_unlock(&hdr->block_mutex);
eb4698f3	355	return (struct snd_util_memblk *)blk;
1da177e4 LT	356	}
	357
	358
	359	/*
	360	* release DMA buffer from page table
	361	*/
eb4698f3	362	int snd_emu10k1_free_pages(struct snd_emu10k1 emu, struct snd_util_memblk blk)
1da177e4	363	{
da3cec35 TI	364	if (snd_BUG_ON(!emu \|\| !blk))
da3cec35 TI	365	return -EINVAL;
1da177e4 LT	366	return snd_emu10k1_synth_free(emu, blk);
	367	}
	368
	369
	370	/*
	371	* memory allocation using multiple pages (for synth)
	372	* Unlike the DMA allocation above, non-contiguous pages are assined.
	373	*/
	374
	375	/*
	376	* allocate a synth sample area
	377	*/
eb4698f3 TI	378	struct snd_util_memblk *
eb4698f3 TI	379	snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
1da177e4	380	{
eb4698f3 TI	381	struct snd_emu10k1_memblk *blk;
eb4698f3 TI	382	struct snd_util_memhdr *hdr = hw->memhdr;
1da177e4	383
62932df8	384	mutex_lock(&hdr->block_mutex);
eb4698f3	385	blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
1da177e4	386	if (blk == NULL) {
62932df8	387	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	388	return NULL;
	389	}
	390	if (synth_alloc_pages(hw, blk)) {
eb4698f3	391	__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
62932df8	392	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	393	return NULL;
	394	}
	395	snd_emu10k1_memblk_map(hw, blk);
62932df8	396	mutex_unlock(&hdr->block_mutex);
eb4698f3	397	return (struct snd_util_memblk *)blk;
1da177e4 LT	398	}
1da177e4 LT	399
2dd31dee	400	EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
1da177e4 LT	401
	402	/*
	403	* free a synth sample area
	404	*/
	405	int
eb4698f3	406	snd_emu10k1_synth_free(struct snd_emu10k1 emu, struct snd_util_memblk memblk)
1da177e4	407	{
eb4698f3 TI	408	struct snd_util_memhdr *hdr = emu->memhdr;
eb4698f3 TI	409	struct snd_emu10k1_memblk blk = (struct snd_emu10k1_memblk )memblk;
1da177e4 LT	410	unsigned long flags;
1da177e4 LT	411
62932df8	412	mutex_lock(&hdr->block_mutex);
1da177e4 LT	413	spin_lock_irqsave(&emu->memblk_lock, flags);
	414	if (blk->mapped_page >= 0)
	415	unmap_memblk(emu, blk);
	416	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	417	synth_free_pages(emu, blk);
	418	__snd_util_mem_free(hdr, memblk);
62932df8	419	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	420	return 0;
	421	}
	422
2dd31dee	423	EXPORT_SYMBOL(snd_emu10k1_synth_free);
1da177e4 LT	424
1da177e4 LT	425	/* check new allocation range */
eb4698f3 TI	426	static void get_single_page_range(struct snd_util_memhdr *hdr,
	427	struct snd_emu10k1_memblk *blk,
	428	int first_page_ret, int last_page_ret)
1da177e4 LT	429	{
1da177e4 LT	430	struct list_head *p;
eb4698f3	431	struct snd_emu10k1_memblk *q;
1da177e4 LT	432	int first_page, last_page;
	433	first_page = blk->first_page;
	434	if ((p = blk->mem.list.prev) != &hdr->block) {
	435	q = get_emu10k1_memblk(p, mem.list);
	436	if (q->last_page == first_page)
	437	first_page++; /* first page was already allocated */
	438	}
	439	last_page = blk->last_page;
	440	if ((p = blk->mem.list.next) != &hdr->block) {
	441	q = get_emu10k1_memblk(p, mem.list);
	442	if (q->first_page == last_page)
	443	last_page--; /* last page was already allocated */
	444	}
	445	*first_page_ret = first_page;
	446	*last_page_ret = last_page;
	447	}
	448
a5003fc0 TI	449	/* release allocated pages */
	450	static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
	451	int last_page)
	452	{
	453	int page;
	454
	455	for (page = first_page; page <= last_page; page++) {
	456	free_page((unsigned long)emu->page_ptr_table[page]);
	457	emu->page_addr_table[page] = 0;
	458	emu->page_ptr_table[page] = NULL;
	459	}
	460	}
	461
1da177e4 LT	462	/*
	463	* allocate kernel pages
	464	*/
eb4698f3	465	static int synth_alloc_pages(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	466	{
1da177e4 LT	467	int page, first_page, last_page;
1da177e4 LT	468
	469	emu10k1_memblk_init(blk);
	470	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
	471	/* allocate kernel pages */
	472	for (page = first_page; page <= last_page; page++) {
a5003fc0 TI	473	/* first try to allocate from <4GB zone */
	474	struct page *p = alloc_page(GFP_KERNEL \| GFP_DMA32 \|
	475	__GFP_NOWARN);
9f515b68	476	if (!p \|\| (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
28437305 TI	477	if (p)
28437305 TI	478	__free_page(p);
a5003fc0	479	/* try to allocate from <16MB zone */
28437305	480	p = alloc_page(GFP_ATOMIC \| GFP_DMA \|
a5003fc0 TI	481	__GFP_NORETRY \| /* no OOM-killer */
a5003fc0 TI	482	__GFP_NOWARN);
9f515b68	483	}
a5003fc0 TI	484	if (!p) {
	485	__synth_free_pages(emu, first_page, page - 1);
	486	return -ENOMEM;
1da177e4	487	}
a5003fc0 TI	488	emu->page_addr_table[page] = page_to_phys(p);
a5003fc0 TI	489	emu->page_ptr_table[page] = page_address(p);
1da177e4 LT	490	}
1da177e4 LT	491	return 0;
1da177e4 LT	492	}
	493
	494	/*
	495	* free pages
	496	*/
eb4698f3	497	static int synth_free_pages(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4	498	{
a5003fc0	499	int first_page, last_page;
1da177e4 LT	500
1da177e4 LT	501	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
a5003fc0	502	__synth_free_pages(emu, first_page, last_page);
1da177e4 LT	503	return 0;
	504	}
	505
	506	/* calculate buffer pointer from offset address */
eb4698f3	507	static inline void offset_ptr(struct snd_emu10k1 emu, int page, int offset)
1da177e4 LT	508	{
1da177e4 LT	509	char *ptr;
da3cec35 TI	510	if (snd_BUG_ON(page < 0 \|\| page >= emu->max_cache_pages))
da3cec35 TI	511	return NULL;
1da177e4 LT	512	ptr = emu->page_ptr_table[page];
1da177e4 LT	513	if (! ptr) {
6f002b02 TI	514	dev_err(emu->card->dev,
6f002b02 TI	515	"access to NULL ptr: page = %d\n", page);
1da177e4 LT	516	return NULL;
	517	}
	518	ptr += offset & (PAGE_SIZE - 1);
	519	return (void*)ptr;
	520	}
	521
	522	/*
	523	* bzero(blk + offset, size)
	524	*/
eb4698f3 TI	525	int snd_emu10k1_synth_bzero(struct snd_emu10k1 emu, struct snd_util_memblk blk,
eb4698f3 TI	526	int offset, int size)
1da177e4 LT	527	{
	528	int page, nextofs, end_offset, temp, temp1;
	529	void *ptr;
eb4698f3	530	struct snd_emu10k1_memblk p = (struct snd_emu10k1_memblk )blk;
1da177e4 LT	531
	532	offset += blk->offset & (PAGE_SIZE - 1);
	533	end_offset = offset + size;
	534	page = get_aligned_page(offset);
	535	do {
	536	nextofs = aligned_page_offset(page + 1);
	537	temp = nextofs - offset;
	538	temp1 = end_offset - offset;
	539	if (temp1 < temp)
	540	temp = temp1;
	541	ptr = offset_ptr(emu, page + p->first_page, offset);
	542	if (ptr)
	543	memset(ptr, 0, temp);
	544	offset = nextofs;
	545	page++;
	546	} while (offset < end_offset);
	547	return 0;
	548	}
	549
2dd31dee TI	550	EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
2dd31dee TI	551
1da177e4 LT	552	/*
	553	* copy_from_user(blk + offset, data, size)
	554	*/
eb4698f3 TI	555	int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 emu, struct snd_util_memblk blk,
eb4698f3 TI	556	int offset, const char __user *data, int size)
1da177e4 LT	557	{
	558	int page, nextofs, end_offset, temp, temp1;
	559	void *ptr;
eb4698f3	560	struct snd_emu10k1_memblk p = (struct snd_emu10k1_memblk )blk;
1da177e4 LT	561
	562	offset += blk->offset & (PAGE_SIZE - 1);
	563	end_offset = offset + size;
	564	page = get_aligned_page(offset);
	565	do {
	566	nextofs = aligned_page_offset(page + 1);
	567	temp = nextofs - offset;
	568	temp1 = end_offset - offset;
	569	if (temp1 < temp)
	570	temp = temp1;
	571	ptr = offset_ptr(emu, page + p->first_page, offset);
	572	if (ptr && copy_from_user(ptr, data, temp))
	573	return -EFAULT;
	574	offset = nextofs;
	575	data += temp;
	576	page++;
	577	} while (offset < end_offset);
	578	return 0;
	579	}
2dd31dee TI	580
2dd31dee TI	581	EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);