[net-next-2.6.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/time.h>
#include <linux/mutex.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) << 1) | (page)))

#define UNIT_PAGES		(PAGE_SIZE / EMUPAGESIZE)
#define MAX_ALIGN_PAGES		(MAXPAGES / 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 = MAX_ALIGN_PAGES - 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 = MAX_ALIGN_PAGES;

	/* 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) {
		snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
		return 0;
	}
	if (addr & (EMUPAGESIZE-1)) {
		snd_printk(KERN_ERR "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 unsed 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_del(&blk->mapped_order_link);
		list_add_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 >= MAXPAGES * EMUPAGESIZE))
		return NULL;
	hdr = emu->memhdr;
	if (snd_BUG_ON(!hdr))
		return NULL;

	mutex_lock(&hdr->block_mutex);
	blk = search_empty(emu, runtime->dma_bytes);
	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;
		addr = snd_pcm_sgbuf_get_addr(substream, ofs);
		if (! is_valid_page(emu, addr)) {
			printk(KERN_ERR "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) {
		printk(KERN_ERR "emu10k1: 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 LT	24	#include <linux/pci.h>
1da177e4 LT	25	#include <linux/time.h>
62932df8 IM	26	#include <linux/mutex.h>
62932df8 IM	27
1da177e4 LT	28	#include <sound/core.h>
	29	#include <sound/emu10k1.h>
	30
	31	/* page arguments of these two macros are Emu page (4096 bytes), not like
	32	* aligned pages in others
	33	*/
	34	#define __set_ptb_entry(emu,page,addr) \
	35	(((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) \| (page)))
	36
	37	#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE)
	38	#define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES)
	39	/* get aligned page from offset address */
	40	#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT)
	41	/* get offset address from aligned page */
	42	#define aligned_page_offset(page) ((page) << PAGE_SHIFT)
	43
	44	#if PAGE_SIZE == 4096
	45	/* page size == EMUPAGESIZE */
	46	/* fill PTB entrie(s) corresponding to page with addr */
	47	#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr)
	48	/* fill PTB entrie(s) corresponding to page with silence pointer */
	49	#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr)
	50	#else
	51	/* fill PTB entries -- we need to fill UNIT_PAGES entries */
eb4698f3	52	static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
1da177e4 LT	53	{
	54	int i;
	55	page *= UNIT_PAGES;
	56	for (i = 0; i < UNIT_PAGES; i++, page++) {
	57	__set_ptb_entry(emu, page, addr);
	58	addr += EMUPAGESIZE;
	59	}
	60	}
eb4698f3	61	static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
1da177e4 LT	62	{
	63	int i;
	64	page *= UNIT_PAGES;
	65	for (i = 0; i < UNIT_PAGES; i++, page++)
	66	/* do not increment ptr */
	67	__set_ptb_entry(emu, page, emu->silent_page.addr);
	68	}
	69	#endif /* PAGE_SIZE */
	70
	71
	72	/*
	73	*/
eb4698f3 TI	74	static int synth_alloc_pages(struct snd_emu10k1 hw, struct snd_emu10k1_memblk blk);
eb4698f3 TI	75	static int synth_free_pages(struct snd_emu10k1 hw, struct snd_emu10k1_memblk blk);
1da177e4	76
eb4698f3	77	#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
1da177e4 LT	78
	79
	80	/* initialize emu10k1 part */
eb4698f3	81	static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
1da177e4 LT	82	{
	83	blk->mapped_page = -1;
	84	INIT_LIST_HEAD(&blk->mapped_link);
	85	INIT_LIST_HEAD(&blk->mapped_order_link);
	86	blk->map_locked = 0;
	87
	88	blk->first_page = get_aligned_page(blk->mem.offset);
	89	blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
	90	blk->pages = blk->last_page - blk->first_page + 1;
	91	}
	92
	93	/*
	94	* search empty region on PTB with the given size
	95	*
	96	* if an empty region is found, return the page and store the next mapped block
	97	* in nextp
	98	* if not found, return a negative error code.
	99	*/
eb4698f3	100	static int search_empty_map_area(struct snd_emu10k1 emu, int npages, struct list_head *nextp)
1da177e4 LT	101	{
	102	int page = 0, found_page = -ENOMEM;
	103	int max_size = npages;
	104	int size;
	105	struct list_head *candidate = &emu->mapped_link_head;
	106	struct list_head *pos;
	107
	108	list_for_each (pos, &emu->mapped_link_head) {
eb4698f3	109	struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
da3cec35 TI	110	if (blk->mapped_page < 0)
da3cec35 TI	111	continue;
1da177e4 LT	112	size = blk->mapped_page - page;
	113	if (size == npages) {
	114	*nextp = pos;
	115	return page;
	116	}
	117	else if (size > max_size) {
	118	/* we look for the maximum empty hole */
	119	max_size = size;
	120	candidate = pos;
	121	found_page = page;
	122	}
	123	page = blk->mapped_page + blk->pages;
	124	}
	125	size = MAX_ALIGN_PAGES - page;
	126	if (size >= max_size) {
	127	*nextp = pos;
	128	return page;
	129	}
	130	*nextp = candidate;
	131	return found_page;
	132	}
	133
	134	/*
	135	* map a memory block onto emu10k1's PTB
	136	*
	137	* call with memblk_lock held
	138	*/
eb4698f3	139	static int map_memblk(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	140	{
	141	int page, pg;
	142	struct list_head *next;
	143
	144	page = search_empty_map_area(emu, blk->pages, &next);
	145	if (page < 0) /* not found */
	146	return page;
	147	/* insert this block in the proper position of mapped list */
	148	list_add_tail(&blk->mapped_link, next);
	149	/* append this as a newest block in order list */
	150	list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
	151	blk->mapped_page = page;
	152	/* fill PTB */
	153	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
	154	set_ptb_entry(emu, page, emu->page_addr_table[pg]);
	155	page++;
	156	}
	157	return 0;
	158	}
	159
	160	/*
	161	* unmap the block
	162	* return the size of resultant empty pages
	163	*
	164	* call with memblk_lock held
	165	*/
eb4698f3	166	static int unmap_memblk(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	167	{
	168	int start_page, end_page, mpage, pg;
	169	struct list_head *p;
eb4698f3	170	struct snd_emu10k1_memblk *q;
1da177e4 LT	171
	172	/* calculate the expected size of empty region */
	173	if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
	174	q = get_emu10k1_memblk(p, mapped_link);
	175	start_page = q->mapped_page + q->pages;
	176	} else
	177	start_page = 0;
	178	if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
	179	q = get_emu10k1_memblk(p, mapped_link);
	180	end_page = q->mapped_page;
	181	} else
	182	end_page = MAX_ALIGN_PAGES;
	183
	184	/* remove links */
	185	list_del(&blk->mapped_link);
	186	list_del(&blk->mapped_order_link);
	187	/* clear PTB */
	188	mpage = blk->mapped_page;
	189	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
	190	set_silent_ptb(emu, mpage);
	191	mpage++;
	192	}
	193	blk->mapped_page = -1;
	194	return end_page - start_page; /* return the new empty size */
	195	}
	196
	197	/*
	198	* search empty pages with the given size, and create a memory block
	199	*
	200	* unlike synth_alloc the memory block is aligned to the page start
	201	*/
eb4698f3 TI	202	static struct snd_emu10k1_memblk *
eb4698f3 TI	203	search_empty(struct snd_emu10k1 *emu, int size)
1da177e4 LT	204	{
1da177e4 LT	205	struct list_head *p;
eb4698f3	206	struct snd_emu10k1_memblk *blk;
1da177e4 LT	207	int page, psize;
	208
	209	psize = get_aligned_page(size + PAGE_SIZE -1);
	210	page = 0;
	211	list_for_each(p, &emu->memhdr->block) {
	212	blk = get_emu10k1_memblk(p, mem.list);
	213	if (page + psize <= blk->first_page)
	214	goto __found_pages;
	215	page = blk->last_page + 1;
	216	}
	217	if (page + psize > emu->max_cache_pages)
	218	return NULL;
	219
	220	__found_pages:
	221	/* create a new memory block */
eb4698f3	222	blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
1da177e4 LT	223	if (blk == NULL)
	224	return NULL;
	225	blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
	226	emu10k1_memblk_init(blk);
	227	return blk;
	228	}
	229
	230
	231	/*
	232	* check if the given pointer is valid for pages
	233	*/
eb4698f3	234	static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
1da177e4 LT	235	{
1da177e4 LT	236	if (addr & ~emu->dma_mask) {
99b359ba	237	snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
1da177e4 LT	238	return 0;
	239	}
	240	if (addr & (EMUPAGESIZE-1)) {
99b359ba	241	snd_printk(KERN_ERR "page is not aligned\n");
1da177e4 LT	242	return 0;
	243	}
	244	return 1;
	245	}
	246
	247	/*
	248	* map the given memory block on PTB.
	249	* if the block is already mapped, update the link order.
	250	* if no empty pages are found, tries to release unsed memory blocks
	251	* and retry the mapping.
	252	*/
eb4698f3	253	int snd_emu10k1_memblk_map(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	254	{
	255	int err;
	256	int size;
	257	struct list_head p, nextp;
eb4698f3	258	struct snd_emu10k1_memblk *deleted;
1da177e4 LT	259	unsigned long flags;
	260
	261	spin_lock_irqsave(&emu->memblk_lock, flags);
	262	if (blk->mapped_page >= 0) {
	263	/* update order link */
	264	list_del(&blk->mapped_order_link);
	265	list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
	266	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	267	return 0;
	268	}
	269	if ((err = map_memblk(emu, blk)) < 0) {
	270	/* no enough page - try to unmap some blocks */
	271	/* starting from the oldest block */
	272	p = emu->mapped_order_link_head.next;
	273	for (; p != &emu->mapped_order_link_head; p = nextp) {
	274	nextp = p->next;
	275	deleted = get_emu10k1_memblk(p, mapped_order_link);
	276	if (deleted->map_locked)
	277	continue;
	278	size = unmap_memblk(emu, deleted);
	279	if (size >= blk->pages) {
	280	/* ok the empty region is enough large */
	281	err = map_memblk(emu, blk);
	282	break;
	283	}
	284	}
	285	}
	286	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	287	return err;
	288	}
	289
2dd31dee TI	290	EXPORT_SYMBOL(snd_emu10k1_memblk_map);
2dd31dee TI	291
1da177e4 LT	292	/*
	293	* page allocation for DMA
	294	*/
eb4698f3 TI	295	struct snd_util_memblk *
eb4698f3 TI	296	snd_emu10k1_alloc_pages(struct snd_emu10k1 emu, struct snd_pcm_substream substream)
1da177e4	297	{
eb4698f3	298	struct snd_pcm_runtime *runtime = substream->runtime;
eb4698f3 TI	299	struct snd_util_memhdr *hdr;
eb4698f3 TI	300	struct snd_emu10k1_memblk *blk;
1da177e4 LT	301	int page, err, idx;
1da177e4 LT	302
da3cec35 TI	303	if (snd_BUG_ON(!emu))
	304	return NULL;
	305	if (snd_BUG_ON(runtime->dma_bytes <= 0 \|\|
	306	runtime->dma_bytes >= MAXPAGES * EMUPAGESIZE))
	307	return NULL;
1da177e4	308	hdr = emu->memhdr;
da3cec35 TI	309	if (snd_BUG_ON(!hdr))
da3cec35 TI	310	return NULL;
1da177e4	311
62932df8	312	mutex_lock(&hdr->block_mutex);
1da177e4 LT	313	blk = search_empty(emu, runtime->dma_bytes);
1da177e4 LT	314	if (blk == NULL) {
62932df8	315	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	316	return NULL;
	317	}
	318	/* fill buffer addresses but pointers are not stored so that
	319	* snd_free_pci_page() is not called in in synth_free()
	320	*/
	321	idx = 0;
	322	for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
77a23f26	323	unsigned long ofs = idx << PAGE_SHIFT;
1da177e4	324	dma_addr_t addr;
77a23f26	325	addr = snd_pcm_sgbuf_get_addr(substream, ofs);
1da177e4 LT	326	if (! is_valid_page(emu, addr)) {
1da177e4 LT	327	printk(KERN_ERR "emu: failure page = %d\n", idx);
62932df8	328	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	329	return NULL;
	330	}
	331	emu->page_addr_table[page] = addr;
	332	emu->page_ptr_table[page] = NULL;
	333	}
	334
	335	/* set PTB entries */
	336	blk->map_locked = 1; /* do not unmap this block! */
	337	err = snd_emu10k1_memblk_map(emu, blk);
	338	if (err < 0) {
eb4698f3	339	__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
62932df8	340	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	341	return NULL;
1da177e4 LT	342	}
62932df8	343	mutex_unlock(&hdr->block_mutex);
eb4698f3	344	return (struct snd_util_memblk *)blk;
1da177e4 LT	345	}
	346
	347
	348	/*
	349	* release DMA buffer from page table
	350	*/
eb4698f3	351	int snd_emu10k1_free_pages(struct snd_emu10k1 emu, struct snd_util_memblk blk)
1da177e4	352	{
da3cec35 TI	353	if (snd_BUG_ON(!emu \|\| !blk))
da3cec35 TI	354	return -EINVAL;
1da177e4 LT	355	return snd_emu10k1_synth_free(emu, blk);
	356	}
	357
	358
	359	/*
	360	* memory allocation using multiple pages (for synth)
	361	* Unlike the DMA allocation above, non-contiguous pages are assined.
	362	*/
	363
	364	/*
	365	* allocate a synth sample area
	366	*/
eb4698f3 TI	367	struct snd_util_memblk *
eb4698f3 TI	368	snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
1da177e4	369	{
eb4698f3 TI	370	struct snd_emu10k1_memblk *blk;
eb4698f3 TI	371	struct snd_util_memhdr *hdr = hw->memhdr;
1da177e4	372
62932df8	373	mutex_lock(&hdr->block_mutex);
eb4698f3	374	blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
1da177e4	375	if (blk == NULL) {
62932df8	376	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	377	return NULL;
	378	}
	379	if (synth_alloc_pages(hw, blk)) {
eb4698f3	380	__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
62932df8	381	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	382	return NULL;
	383	}
	384	snd_emu10k1_memblk_map(hw, blk);
62932df8	385	mutex_unlock(&hdr->block_mutex);
eb4698f3	386	return (struct snd_util_memblk *)blk;
1da177e4 LT	387	}
1da177e4 LT	388
2dd31dee	389	EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
1da177e4 LT	390
	391	/*
	392	* free a synth sample area
	393	*/
	394	int
eb4698f3	395	snd_emu10k1_synth_free(struct snd_emu10k1 emu, struct snd_util_memblk memblk)
1da177e4	396	{
eb4698f3 TI	397	struct snd_util_memhdr *hdr = emu->memhdr;
eb4698f3 TI	398	struct snd_emu10k1_memblk blk = (struct snd_emu10k1_memblk )memblk;
1da177e4 LT	399	unsigned long flags;
1da177e4 LT	400
62932df8	401	mutex_lock(&hdr->block_mutex);
1da177e4 LT	402	spin_lock_irqsave(&emu->memblk_lock, flags);
	403	if (blk->mapped_page >= 0)
	404	unmap_memblk(emu, blk);
	405	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	406	synth_free_pages(emu, blk);
	407	__snd_util_mem_free(hdr, memblk);
62932df8	408	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	409	return 0;
	410	}
	411
2dd31dee	412	EXPORT_SYMBOL(snd_emu10k1_synth_free);
1da177e4 LT	413
1da177e4 LT	414	/* check new allocation range */
eb4698f3 TI	415	static void get_single_page_range(struct snd_util_memhdr *hdr,
	416	struct snd_emu10k1_memblk *blk,
	417	int first_page_ret, int last_page_ret)
1da177e4 LT	418	{
1da177e4 LT	419	struct list_head *p;
eb4698f3	420	struct snd_emu10k1_memblk *q;
1da177e4 LT	421	int first_page, last_page;
	422	first_page = blk->first_page;
	423	if ((p = blk->mem.list.prev) != &hdr->block) {
	424	q = get_emu10k1_memblk(p, mem.list);
	425	if (q->last_page == first_page)
	426	first_page++; /* first page was already allocated */
	427	}
	428	last_page = blk->last_page;
	429	if ((p = blk->mem.list.next) != &hdr->block) {
	430	q = get_emu10k1_memblk(p, mem.list);
	431	if (q->first_page == last_page)
	432	last_page--; /* last page was already allocated */
	433	}
	434	*first_page_ret = first_page;
	435	*last_page_ret = last_page;
	436	}
	437
a5003fc0 TI	438	/* release allocated pages */
	439	static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
	440	int last_page)
	441	{
	442	int page;
	443
	444	for (page = first_page; page <= last_page; page++) {
	445	free_page((unsigned long)emu->page_ptr_table[page]);
	446	emu->page_addr_table[page] = 0;
	447	emu->page_ptr_table[page] = NULL;
	448	}
	449	}
	450
1da177e4 LT	451	/*
	452	* allocate kernel pages
	453	*/
eb4698f3	454	static int synth_alloc_pages(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	455	{
1da177e4 LT	456	int page, first_page, last_page;
1da177e4 LT	457
	458	emu10k1_memblk_init(blk);
	459	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
	460	/* allocate kernel pages */
	461	for (page = first_page; page <= last_page; page++) {
a5003fc0 TI	462	/* first try to allocate from <4GB zone */
	463	struct page *p = alloc_page(GFP_KERNEL \| GFP_DMA32 \|
	464	__GFP_NOWARN);
9f515b68	465	if (!p \|\| (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
28437305 TI	466	if (p)
28437305 TI	467	__free_page(p);
a5003fc0	468	/* try to allocate from <16MB zone */
28437305	469	p = alloc_page(GFP_ATOMIC \| GFP_DMA \|
a5003fc0 TI	470	__GFP_NORETRY \| /* no OOM-killer */
a5003fc0 TI	471	__GFP_NOWARN);
9f515b68	472	}
a5003fc0 TI	473	if (!p) {
	474	__synth_free_pages(emu, first_page, page - 1);
	475	return -ENOMEM;
1da177e4	476	}
a5003fc0 TI	477	emu->page_addr_table[page] = page_to_phys(p);
a5003fc0 TI	478	emu->page_ptr_table[page] = page_address(p);
1da177e4 LT	479	}
1da177e4 LT	480	return 0;
1da177e4 LT	481	}
	482
	483	/*
	484	* free pages
	485	*/
eb4698f3	486	static int synth_free_pages(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4	487	{
a5003fc0	488	int first_page, last_page;
1da177e4 LT	489
1da177e4 LT	490	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
a5003fc0	491	__synth_free_pages(emu, first_page, last_page);
1da177e4 LT	492	return 0;
	493	}
	494
	495	/* calculate buffer pointer from offset address */
eb4698f3	496	static inline void offset_ptr(struct snd_emu10k1 emu, int page, int offset)
1da177e4 LT	497	{
1da177e4 LT	498	char *ptr;
da3cec35 TI	499	if (snd_BUG_ON(page < 0 \|\| page >= emu->max_cache_pages))
da3cec35 TI	500	return NULL;
1da177e4 LT	501	ptr = emu->page_ptr_table[page];
1da177e4 LT	502	if (! ptr) {
99b359ba	503	printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
1da177e4 LT	504	return NULL;
	505	}
	506	ptr += offset & (PAGE_SIZE - 1);
	507	return (void*)ptr;
	508	}
	509
	510	/*
	511	* bzero(blk + offset, size)
	512	*/
eb4698f3 TI	513	int snd_emu10k1_synth_bzero(struct snd_emu10k1 emu, struct snd_util_memblk blk,
eb4698f3 TI	514	int offset, int size)
1da177e4 LT	515	{
	516	int page, nextofs, end_offset, temp, temp1;
	517	void *ptr;
eb4698f3	518	struct snd_emu10k1_memblk p = (struct snd_emu10k1_memblk )blk;
1da177e4 LT	519
	520	offset += blk->offset & (PAGE_SIZE - 1);
	521	end_offset = offset + size;
	522	page = get_aligned_page(offset);
	523	do {
	524	nextofs = aligned_page_offset(page + 1);
	525	temp = nextofs - offset;
	526	temp1 = end_offset - offset;
	527	if (temp1 < temp)
	528	temp = temp1;
	529	ptr = offset_ptr(emu, page + p->first_page, offset);
	530	if (ptr)
	531	memset(ptr, 0, temp);
	532	offset = nextofs;
	533	page++;
	534	} while (offset < end_offset);
	535	return 0;
	536	}
	537
2dd31dee TI	538	EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
2dd31dee TI	539
1da177e4 LT	540	/*
	541	* copy_from_user(blk + offset, data, size)
	542	*/
eb4698f3 TI	543	int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 emu, struct snd_util_memblk blk,
eb4698f3 TI	544	int offset, const char __user *data, int size)
1da177e4 LT	545	{
	546	int page, nextofs, end_offset, temp, temp1;
	547	void *ptr;
eb4698f3	548	struct snd_emu10k1_memblk p = (struct snd_emu10k1_memblk )blk;
1da177e4 LT	549
	550	offset += blk->offset & (PAGE_SIZE - 1);
	551	end_offset = offset + size;
	552	page = get_aligned_page(offset);
	553	do {
	554	nextofs = aligned_page_offset(page + 1);
	555	temp = nextofs - offset;
	556	temp1 = end_offset - offset;
	557	if (temp1 < temp)
	558	temp = temp1;
	559	ptr = offset_ptr(emu, page + p->first_page, offset);
	560	if (ptr && copy_from_user(ptr, data, temp))
	561	return -EFAULT;
	562	offset = nextofs;
	563	data += temp;
	564	page++;
	565	} while (offset < end_offset);
	566	return 0;
	567	}
2dd31dee TI	568
2dd31dee TI	569	EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);