[deliverable/linux.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);
		snd_assert(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_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
	struct snd_util_memhdr *hdr;
	struct snd_emu10k1_memblk *blk;
	int page, err, idx;

	snd_assert(emu, return NULL);
	snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL);
	hdr = emu->memhdr;
	snd_assert(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++) {
		dma_addr_t addr;
#ifdef CONFIG_SND_DEBUG
		if (idx >= sgbuf->pages) {
			printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n",
			       blk->first_page, blk->last_page, sgbuf->pages);
			mutex_unlock(&hdr->block_mutex);
			return NULL;
		}
#endif
		addr = sgbuf->table[idx].addr;
		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)
{
	snd_assert(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)))
			/* 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;
	snd_assert(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);
1da177e4 LT	110	snd_assert(blk->mapped_page >= 0, continue);
	111	size = blk->mapped_page - page;
	112	if (size == npages) {
	113	*nextp = pos;
	114	return page;
	115	}
	116	else if (size > max_size) {
	117	/* we look for the maximum empty hole */
	118	max_size = size;
	119	candidate = pos;
	120	found_page = page;
	121	}
	122	page = blk->mapped_page + blk->pages;
	123	}
	124	size = MAX_ALIGN_PAGES - page;
	125	if (size >= max_size) {
	126	*nextp = pos;
	127	return page;
	128	}
	129	*nextp = candidate;
	130	return found_page;
	131	}
	132
	133	/*
	134	* map a memory block onto emu10k1's PTB
	135	*
	136	* call with memblk_lock held
	137	*/
eb4698f3	138	static int map_memblk(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	139	{
	140	int page, pg;
	141	struct list_head *next;
	142
	143	page = search_empty_map_area(emu, blk->pages, &next);
	144	if (page < 0) /* not found */
	145	return page;
	146	/* insert this block in the proper position of mapped list */
	147	list_add_tail(&blk->mapped_link, next);
	148	/* append this as a newest block in order list */
	149	list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
	150	blk->mapped_page = page;
	151	/* fill PTB */
	152	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
	153	set_ptb_entry(emu, page, emu->page_addr_table[pg]);
	154	page++;
	155	}
	156	return 0;
	157	}
	158
	159	/*
	160	* unmap the block
	161	* return the size of resultant empty pages
	162	*
	163	* call with memblk_lock held
	164	*/
eb4698f3	165	static int unmap_memblk(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	166	{
	167	int start_page, end_page, mpage, pg;
	168	struct list_head *p;
eb4698f3	169	struct snd_emu10k1_memblk *q;
1da177e4 LT	170
	171	/* calculate the expected size of empty region */
	172	if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
	173	q = get_emu10k1_memblk(p, mapped_link);
	174	start_page = q->mapped_page + q->pages;
	175	} else
	176	start_page = 0;
	177	if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
	178	q = get_emu10k1_memblk(p, mapped_link);
	179	end_page = q->mapped_page;
	180	} else
	181	end_page = MAX_ALIGN_PAGES;
	182
	183	/* remove links */
	184	list_del(&blk->mapped_link);
	185	list_del(&blk->mapped_order_link);
	186	/* clear PTB */
	187	mpage = blk->mapped_page;
	188	for (pg = blk->first_page; pg <= blk->last_page; pg++) {
	189	set_silent_ptb(emu, mpage);
	190	mpage++;
	191	}
	192	blk->mapped_page = -1;
	193	return end_page - start_page; /* return the new empty size */
	194	}
	195
	196	/*
	197	* search empty pages with the given size, and create a memory block
	198	*
	199	* unlike synth_alloc the memory block is aligned to the page start
	200	*/
eb4698f3 TI	201	static struct snd_emu10k1_memblk *
eb4698f3 TI	202	search_empty(struct snd_emu10k1 *emu, int size)
1da177e4 LT	203	{
1da177e4 LT	204	struct list_head *p;
eb4698f3	205	struct snd_emu10k1_memblk *blk;
1da177e4 LT	206	int page, psize;
	207
	208	psize = get_aligned_page(size + PAGE_SIZE -1);
	209	page = 0;
	210	list_for_each(p, &emu->memhdr->block) {
	211	blk = get_emu10k1_memblk(p, mem.list);
	212	if (page + psize <= blk->first_page)
	213	goto __found_pages;
	214	page = blk->last_page + 1;
	215	}
	216	if (page + psize > emu->max_cache_pages)
	217	return NULL;
	218
	219	__found_pages:
	220	/* create a new memory block */
eb4698f3	221	blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
1da177e4 LT	222	if (blk == NULL)
	223	return NULL;
	224	blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
	225	emu10k1_memblk_init(blk);
	226	return blk;
	227	}
	228
	229
	230	/*
	231	* check if the given pointer is valid for pages
	232	*/
eb4698f3	233	static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
1da177e4 LT	234	{
1da177e4 LT	235	if (addr & ~emu->dma_mask) {
99b359ba	236	snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
1da177e4 LT	237	return 0;
	238	}
	239	if (addr & (EMUPAGESIZE-1)) {
99b359ba	240	snd_printk(KERN_ERR "page is not aligned\n");
1da177e4 LT	241	return 0;
	242	}
	243	return 1;
	244	}
	245
	246	/*
	247	* map the given memory block on PTB.
	248	* if the block is already mapped, update the link order.
	249	* if no empty pages are found, tries to release unsed memory blocks
	250	* and retry the mapping.
	251	*/
eb4698f3	252	int snd_emu10k1_memblk_map(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	253	{
	254	int err;
	255	int size;
	256	struct list_head p, nextp;
eb4698f3	257	struct snd_emu10k1_memblk *deleted;
1da177e4 LT	258	unsigned long flags;
	259
	260	spin_lock_irqsave(&emu->memblk_lock, flags);
	261	if (blk->mapped_page >= 0) {
	262	/* update order link */
	263	list_del(&blk->mapped_order_link);
	264	list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
	265	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	266	return 0;
	267	}
	268	if ((err = map_memblk(emu, blk)) < 0) {
	269	/* no enough page - try to unmap some blocks */
	270	/* starting from the oldest block */
	271	p = emu->mapped_order_link_head.next;
	272	for (; p != &emu->mapped_order_link_head; p = nextp) {
	273	nextp = p->next;
	274	deleted = get_emu10k1_memblk(p, mapped_order_link);
	275	if (deleted->map_locked)
	276	continue;
	277	size = unmap_memblk(emu, deleted);
	278	if (size >= blk->pages) {
	279	/* ok the empty region is enough large */
	280	err = map_memblk(emu, blk);
	281	break;
	282	}
	283	}
	284	}
	285	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	286	return err;
	287	}
	288
2dd31dee TI	289	EXPORT_SYMBOL(snd_emu10k1_memblk_map);
2dd31dee TI	290
1da177e4 LT	291	/*
	292	* page allocation for DMA
	293	*/
eb4698f3 TI	294	struct snd_util_memblk *
eb4698f3 TI	295	snd_emu10k1_alloc_pages(struct snd_emu10k1 emu, struct snd_pcm_substream substream)
1da177e4	296	{
eb4698f3	297	struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4	298	struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
eb4698f3 TI	299	struct snd_util_memhdr *hdr;
eb4698f3 TI	300	struct snd_emu10k1_memblk *blk;
1da177e4 LT	301	int page, err, idx;
	302
	303	snd_assert(emu, return NULL);
	304	snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL);
	305	hdr = emu->memhdr;
	306	snd_assert(hdr, return NULL);
	307
62932df8	308	mutex_lock(&hdr->block_mutex);
1da177e4 LT	309	blk = search_empty(emu, runtime->dma_bytes);
1da177e4 LT	310	if (blk == NULL) {
62932df8	311	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	312	return NULL;
	313	}
	314	/* fill buffer addresses but pointers are not stored so that
	315	* snd_free_pci_page() is not called in in synth_free()
	316	*/
	317	idx = 0;
	318	for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
	319	dma_addr_t addr;
	320	#ifdef CONFIG_SND_DEBUG
	321	if (idx >= sgbuf->pages) {
	322	printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n",
	323	blk->first_page, blk->last_page, sgbuf->pages);
62932df8	324	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	325	return NULL;
	326	}
	327	#endif
	328	addr = sgbuf->table[idx].addr;
	329	if (! is_valid_page(emu, addr)) {
	330	printk(KERN_ERR "emu: failure page = %d\n", idx);
62932df8	331	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	332	return NULL;
	333	}
	334	emu->page_addr_table[page] = addr;
	335	emu->page_ptr_table[page] = NULL;
	336	}
	337
	338	/* set PTB entries */
	339	blk->map_locked = 1; /* do not unmap this block! */
	340	err = snd_emu10k1_memblk_map(emu, blk);
	341	if (err < 0) {
eb4698f3	342	__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
62932df8	343	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	344	return NULL;
1da177e4 LT	345	}
62932df8	346	mutex_unlock(&hdr->block_mutex);
eb4698f3	347	return (struct snd_util_memblk *)blk;
1da177e4 LT	348	}
	349
	350
	351	/*
	352	* release DMA buffer from page table
	353	*/
eb4698f3	354	int snd_emu10k1_free_pages(struct snd_emu10k1 emu, struct snd_util_memblk blk)
1da177e4 LT	355	{
	356	snd_assert(emu && blk, return -EINVAL);
	357	return snd_emu10k1_synth_free(emu, blk);
	358	}
	359
	360
	361	/*
	362	* memory allocation using multiple pages (for synth)
	363	* Unlike the DMA allocation above, non-contiguous pages are assined.
	364	*/
	365
	366	/*
	367	* allocate a synth sample area
	368	*/
eb4698f3 TI	369	struct snd_util_memblk *
eb4698f3 TI	370	snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
1da177e4	371	{
eb4698f3 TI	372	struct snd_emu10k1_memblk *blk;
eb4698f3 TI	373	struct snd_util_memhdr *hdr = hw->memhdr;
1da177e4	374
62932df8	375	mutex_lock(&hdr->block_mutex);
eb4698f3	376	blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
1da177e4	377	if (blk == NULL) {
62932df8	378	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	379	return NULL;
	380	}
	381	if (synth_alloc_pages(hw, blk)) {
eb4698f3	382	__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
62932df8	383	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	384	return NULL;
	385	}
	386	snd_emu10k1_memblk_map(hw, blk);
62932df8	387	mutex_unlock(&hdr->block_mutex);
eb4698f3	388	return (struct snd_util_memblk *)blk;
1da177e4 LT	389	}
1da177e4 LT	390
2dd31dee	391	EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
1da177e4 LT	392
	393	/*
	394	* free a synth sample area
	395	*/
	396	int
eb4698f3	397	snd_emu10k1_synth_free(struct snd_emu10k1 emu, struct snd_util_memblk memblk)
1da177e4	398	{
eb4698f3 TI	399	struct snd_util_memhdr *hdr = emu->memhdr;
eb4698f3 TI	400	struct snd_emu10k1_memblk blk = (struct snd_emu10k1_memblk )memblk;
1da177e4 LT	401	unsigned long flags;
1da177e4 LT	402
62932df8	403	mutex_lock(&hdr->block_mutex);
1da177e4 LT	404	spin_lock_irqsave(&emu->memblk_lock, flags);
	405	if (blk->mapped_page >= 0)
	406	unmap_memblk(emu, blk);
	407	spin_unlock_irqrestore(&emu->memblk_lock, flags);
	408	synth_free_pages(emu, blk);
	409	__snd_util_mem_free(hdr, memblk);
62932df8	410	mutex_unlock(&hdr->block_mutex);
1da177e4 LT	411	return 0;
	412	}
	413
2dd31dee	414	EXPORT_SYMBOL(snd_emu10k1_synth_free);
1da177e4 LT	415
1da177e4 LT	416	/* check new allocation range */
eb4698f3 TI	417	static void get_single_page_range(struct snd_util_memhdr *hdr,
	418	struct snd_emu10k1_memblk *blk,
	419	int first_page_ret, int last_page_ret)
1da177e4 LT	420	{
1da177e4 LT	421	struct list_head *p;
eb4698f3	422	struct snd_emu10k1_memblk *q;
1da177e4 LT	423	int first_page, last_page;
	424	first_page = blk->first_page;
	425	if ((p = blk->mem.list.prev) != &hdr->block) {
	426	q = get_emu10k1_memblk(p, mem.list);
	427	if (q->last_page == first_page)
	428	first_page++; /* first page was already allocated */
	429	}
	430	last_page = blk->last_page;
	431	if ((p = blk->mem.list.next) != &hdr->block) {
	432	q = get_emu10k1_memblk(p, mem.list);
	433	if (q->first_page == last_page)
	434	last_page--; /* last page was already allocated */
	435	}
	436	*first_page_ret = first_page;
	437	*last_page_ret = last_page;
	438	}
	439
a5003fc0 TI	440	/* release allocated pages */
	441	static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
	442	int last_page)
	443	{
	444	int page;
	445
	446	for (page = first_page; page <= last_page; page++) {
	447	free_page((unsigned long)emu->page_ptr_table[page]);
	448	emu->page_addr_table[page] = 0;
	449	emu->page_ptr_table[page] = NULL;
	450	}
	451	}
	452
1da177e4 LT	453	/*
	454	* allocate kernel pages
	455	*/
eb4698f3	456	static int synth_alloc_pages(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4 LT	457	{
1da177e4 LT	458	int page, first_page, last_page;
1da177e4 LT	459
	460	emu10k1_memblk_init(blk);
	461	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
	462	/* allocate kernel pages */
	463	for (page = first_page; page <= last_page; page++) {
a5003fc0 TI	464	/* first try to allocate from <4GB zone */
	465	struct page *p = alloc_page(GFP_KERNEL \| GFP_DMA32 \|
	466	__GFP_NOWARN);
	467	if (!p \|\| (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT)))
	468	/* try to allocate from <16MB zone */
781711a9	469	p = alloc_page(GFP_ATOMIC \| GFP_DMA \|
a5003fc0 TI	470	__GFP_NORETRY \| /* no OOM-killer */
	471	__GFP_NOWARN);
	472	if (!p) {
	473	__synth_free_pages(emu, first_page, page - 1);
	474	return -ENOMEM;
1da177e4	475	}
a5003fc0 TI	476	emu->page_addr_table[page] = page_to_phys(p);
a5003fc0 TI	477	emu->page_ptr_table[page] = page_address(p);
1da177e4 LT	478	}
1da177e4 LT	479	return 0;
1da177e4 LT	480	}
	481
	482	/*
	483	* free pages
	484	*/
eb4698f3	485	static int synth_free_pages(struct snd_emu10k1 emu, struct snd_emu10k1_memblk blk)
1da177e4	486	{
a5003fc0	487	int first_page, last_page;
1da177e4 LT	488
1da177e4 LT	489	get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
a5003fc0	490	__synth_free_pages(emu, first_page, last_page);
1da177e4 LT	491	return 0;
	492	}
	493
	494	/* calculate buffer pointer from offset address */
eb4698f3	495	static inline void offset_ptr(struct snd_emu10k1 emu, int page, int offset)
1da177e4 LT	496	{
	497	char *ptr;
	498	snd_assert(page >= 0 && page < emu->max_cache_pages, return NULL);
	499	ptr = emu->page_ptr_table[page];
	500	if (! ptr) {
99b359ba	501	printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
1da177e4 LT	502	return NULL;
	503	}
	504	ptr += offset & (PAGE_SIZE - 1);
	505	return (void*)ptr;
	506	}
	507
	508	/*
	509	* bzero(blk + offset, size)
	510	*/
eb4698f3 TI	511	int snd_emu10k1_synth_bzero(struct snd_emu10k1 emu, struct snd_util_memblk blk,
eb4698f3 TI	512	int offset, int size)
1da177e4 LT	513	{
	514	int page, nextofs, end_offset, temp, temp1;
	515	void *ptr;
eb4698f3	516	struct snd_emu10k1_memblk p = (struct snd_emu10k1_memblk )blk;
1da177e4 LT	517
	518	offset += blk->offset & (PAGE_SIZE - 1);
	519	end_offset = offset + size;
	520	page = get_aligned_page(offset);
	521	do {
	522	nextofs = aligned_page_offset(page + 1);
	523	temp = nextofs - offset;
	524	temp1 = end_offset - offset;
	525	if (temp1 < temp)
	526	temp = temp1;
	527	ptr = offset_ptr(emu, page + p->first_page, offset);
	528	if (ptr)
	529	memset(ptr, 0, temp);
	530	offset = nextofs;
	531	page++;
	532	} while (offset < end_offset);
	533	return 0;
	534	}
	535
2dd31dee TI	536	EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
2dd31dee TI	537
1da177e4 LT	538	/*
	539	* copy_from_user(blk + offset, data, size)
	540	*/
eb4698f3 TI	541	int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 emu, struct snd_util_memblk blk,
eb4698f3 TI	542	int offset, const char __user *data, int size)
1da177e4 LT	543	{
	544	int page, nextofs, end_offset, temp, temp1;
	545	void *ptr;
eb4698f3	546	struct snd_emu10k1_memblk p = (struct snd_emu10k1_memblk )blk;
1da177e4 LT	547
	548	offset += blk->offset & (PAGE_SIZE - 1);
	549	end_offset = offset + size;
	550	page = get_aligned_page(offset);
	551	do {
	552	nextofs = aligned_page_offset(page + 1);
	553	temp = nextofs - offset;
	554	temp1 = end_offset - offset;
	555	if (temp1 < temp)
	556	temp = temp1;
	557	ptr = offset_ptr(emu, page + p->first_page, offset);
	558	if (ptr && copy_from_user(ptr, data, temp))
	559	return -EFAULT;
	560	offset = nextofs;
	561	data += temp;
	562	page++;
	563	} while (offset < end_offset);
	564	return 0;
	565	}
2dd31dee TI	566
2dd31dee TI	567	EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);