573 lines
16 KiB
C
573 lines
16 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*
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* EMU10K1 memory page allocation (PTB area)
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/pci.h>
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#include <linux/gfp.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <sound/core.h>
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#include <sound/emu10k1.h>
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/* page arguments of these two macros are Emu page (4096 bytes), not like
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* aligned pages in others
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*/
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#define __set_ptb_entry(emu,page,addr) \
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(((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page)))
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#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE)
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#define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES)
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/* get aligned page from offset address */
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#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT)
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/* get offset address from aligned page */
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#define aligned_page_offset(page) ((page) << PAGE_SHIFT)
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#if PAGE_SIZE == 4096
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/* page size == EMUPAGESIZE */
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/* fill PTB entrie(s) corresponding to page with addr */
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#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr)
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/* fill PTB entrie(s) corresponding to page with silence pointer */
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#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr)
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#else
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/* fill PTB entries -- we need to fill UNIT_PAGES entries */
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static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
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{
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int i;
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page *= UNIT_PAGES;
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for (i = 0; i < UNIT_PAGES; i++, page++) {
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__set_ptb_entry(emu, page, addr);
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addr += EMUPAGESIZE;
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}
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}
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static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
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{
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int i;
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page *= UNIT_PAGES;
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for (i = 0; i < UNIT_PAGES; i++, page++)
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/* do not increment ptr */
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__set_ptb_entry(emu, page, emu->silent_page.addr);
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}
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#endif /* PAGE_SIZE */
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/*
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*/
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static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
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static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
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#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
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/* initialize emu10k1 part */
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static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
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{
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blk->mapped_page = -1;
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INIT_LIST_HEAD(&blk->mapped_link);
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INIT_LIST_HEAD(&blk->mapped_order_link);
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blk->map_locked = 0;
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blk->first_page = get_aligned_page(blk->mem.offset);
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blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
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blk->pages = blk->last_page - blk->first_page + 1;
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}
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/*
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* search empty region on PTB with the given size
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*
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* if an empty region is found, return the page and store the next mapped block
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* in nextp
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* if not found, return a negative error code.
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*/
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static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
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{
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int page = 0, found_page = -ENOMEM;
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int max_size = npages;
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int size;
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struct list_head *candidate = &emu->mapped_link_head;
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struct list_head *pos;
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list_for_each (pos, &emu->mapped_link_head) {
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struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
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if (blk->mapped_page < 0)
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continue;
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size = blk->mapped_page - page;
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if (size == npages) {
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*nextp = pos;
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return page;
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}
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else if (size > max_size) {
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/* we look for the maximum empty hole */
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max_size = size;
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candidate = pos;
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found_page = page;
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}
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page = blk->mapped_page + blk->pages;
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}
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size = MAX_ALIGN_PAGES - page;
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if (size >= max_size) {
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*nextp = pos;
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return page;
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}
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*nextp = candidate;
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return found_page;
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}
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/*
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* map a memory block onto emu10k1's PTB
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*
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* call with memblk_lock held
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*/
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static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
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{
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int page, pg;
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struct list_head *next;
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page = search_empty_map_area(emu, blk->pages, &next);
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if (page < 0) /* not found */
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return page;
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/* insert this block in the proper position of mapped list */
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list_add_tail(&blk->mapped_link, next);
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/* append this as a newest block in order list */
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list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
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blk->mapped_page = page;
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/* fill PTB */
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for (pg = blk->first_page; pg <= blk->last_page; pg++) {
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set_ptb_entry(emu, page, emu->page_addr_table[pg]);
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page++;
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}
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return 0;
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}
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/*
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* unmap the block
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* return the size of resultant empty pages
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*
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* call with memblk_lock held
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*/
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static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
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{
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int start_page, end_page, mpage, pg;
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struct list_head *p;
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struct snd_emu10k1_memblk *q;
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/* calculate the expected size of empty region */
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if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
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q = get_emu10k1_memblk(p, mapped_link);
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start_page = q->mapped_page + q->pages;
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} else
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start_page = 0;
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if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
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q = get_emu10k1_memblk(p, mapped_link);
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end_page = q->mapped_page;
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} else
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end_page = MAX_ALIGN_PAGES;
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/* remove links */
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list_del(&blk->mapped_link);
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list_del(&blk->mapped_order_link);
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/* clear PTB */
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mpage = blk->mapped_page;
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for (pg = blk->first_page; pg <= blk->last_page; pg++) {
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set_silent_ptb(emu, mpage);
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mpage++;
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}
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blk->mapped_page = -1;
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return end_page - start_page; /* return the new empty size */
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}
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/*
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* search empty pages with the given size, and create a memory block
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*
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* unlike synth_alloc the memory block is aligned to the page start
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*/
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static struct snd_emu10k1_memblk *
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search_empty(struct snd_emu10k1 *emu, int size)
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{
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struct list_head *p;
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struct snd_emu10k1_memblk *blk;
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int page, psize;
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psize = get_aligned_page(size + PAGE_SIZE -1);
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page = 0;
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list_for_each(p, &emu->memhdr->block) {
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blk = get_emu10k1_memblk(p, mem.list);
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if (page + psize <= blk->first_page)
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goto __found_pages;
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page = blk->last_page + 1;
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}
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if (page + psize > emu->max_cache_pages)
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return NULL;
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__found_pages:
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/* create a new memory block */
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blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
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if (blk == NULL)
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return NULL;
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blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
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emu10k1_memblk_init(blk);
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return blk;
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}
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/*
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* check if the given pointer is valid for pages
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*/
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static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
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{
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if (addr & ~emu->dma_mask) {
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snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
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return 0;
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}
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if (addr & (EMUPAGESIZE-1)) {
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snd_printk(KERN_ERR "page is not aligned\n");
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return 0;
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}
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return 1;
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}
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/*
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* map the given memory block on PTB.
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* if the block is already mapped, update the link order.
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* if no empty pages are found, tries to release unsed memory blocks
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* and retry the mapping.
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*/
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int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
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{
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int err;
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int size;
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struct list_head *p, *nextp;
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struct snd_emu10k1_memblk *deleted;
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unsigned long flags;
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spin_lock_irqsave(&emu->memblk_lock, flags);
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if (blk->mapped_page >= 0) {
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/* update order link */
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list_del(&blk->mapped_order_link);
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list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
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spin_unlock_irqrestore(&emu->memblk_lock, flags);
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return 0;
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}
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if ((err = map_memblk(emu, blk)) < 0) {
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/* no enough page - try to unmap some blocks */
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/* starting from the oldest block */
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p = emu->mapped_order_link_head.next;
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for (; p != &emu->mapped_order_link_head; p = nextp) {
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nextp = p->next;
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deleted = get_emu10k1_memblk(p, mapped_order_link);
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if (deleted->map_locked)
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continue;
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size = unmap_memblk(emu, deleted);
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if (size >= blk->pages) {
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/* ok the empty region is enough large */
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err = map_memblk(emu, blk);
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break;
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}
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}
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}
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spin_unlock_irqrestore(&emu->memblk_lock, flags);
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return err;
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}
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EXPORT_SYMBOL(snd_emu10k1_memblk_map);
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/*
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* page allocation for DMA
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*/
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struct snd_util_memblk *
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snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_util_memhdr *hdr;
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struct snd_emu10k1_memblk *blk;
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int page, err, idx;
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if (snd_BUG_ON(!emu))
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return NULL;
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if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
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runtime->dma_bytes >= MAXPAGES * EMUPAGESIZE))
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return NULL;
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hdr = emu->memhdr;
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if (snd_BUG_ON(!hdr))
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return NULL;
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idx = runtime->period_size >= runtime->buffer_size ?
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(emu->delay_pcm_irq * 2) : 0;
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mutex_lock(&hdr->block_mutex);
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blk = search_empty(emu, runtime->dma_bytes + idx);
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if (blk == NULL) {
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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/* fill buffer addresses but pointers are not stored so that
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* snd_free_pci_page() is not called in in synth_free()
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*/
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idx = 0;
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for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
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unsigned long ofs = idx << PAGE_SHIFT;
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dma_addr_t addr;
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addr = snd_pcm_sgbuf_get_addr(substream, ofs);
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if (! is_valid_page(emu, addr)) {
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printk(KERN_ERR "emu: failure page = %d\n", idx);
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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emu->page_addr_table[page] = addr;
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emu->page_ptr_table[page] = NULL;
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}
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/* set PTB entries */
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blk->map_locked = 1; /* do not unmap this block! */
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err = snd_emu10k1_memblk_map(emu, blk);
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if (err < 0) {
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__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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mutex_unlock(&hdr->block_mutex);
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return (struct snd_util_memblk *)blk;
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}
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/*
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* release DMA buffer from page table
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*/
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int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
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{
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if (snd_BUG_ON(!emu || !blk))
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return -EINVAL;
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return snd_emu10k1_synth_free(emu, blk);
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}
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/*
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* memory allocation using multiple pages (for synth)
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* Unlike the DMA allocation above, non-contiguous pages are assined.
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*/
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/*
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* allocate a synth sample area
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*/
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struct snd_util_memblk *
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snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
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{
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struct snd_emu10k1_memblk *blk;
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struct snd_util_memhdr *hdr = hw->memhdr;
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mutex_lock(&hdr->block_mutex);
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blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
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if (blk == NULL) {
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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if (synth_alloc_pages(hw, blk)) {
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__snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
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mutex_unlock(&hdr->block_mutex);
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return NULL;
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}
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snd_emu10k1_memblk_map(hw, blk);
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mutex_unlock(&hdr->block_mutex);
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return (struct snd_util_memblk *)blk;
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}
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EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
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/*
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* free a synth sample area
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*/
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int
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snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
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{
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struct snd_util_memhdr *hdr = emu->memhdr;
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struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
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unsigned long flags;
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mutex_lock(&hdr->block_mutex);
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spin_lock_irqsave(&emu->memblk_lock, flags);
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if (blk->mapped_page >= 0)
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unmap_memblk(emu, blk);
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spin_unlock_irqrestore(&emu->memblk_lock, flags);
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synth_free_pages(emu, blk);
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__snd_util_mem_free(hdr, memblk);
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mutex_unlock(&hdr->block_mutex);
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return 0;
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}
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EXPORT_SYMBOL(snd_emu10k1_synth_free);
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/* check new allocation range */
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static void get_single_page_range(struct snd_util_memhdr *hdr,
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struct snd_emu10k1_memblk *blk,
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int *first_page_ret, int *last_page_ret)
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{
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struct list_head *p;
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struct snd_emu10k1_memblk *q;
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int first_page, last_page;
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first_page = blk->first_page;
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if ((p = blk->mem.list.prev) != &hdr->block) {
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q = get_emu10k1_memblk(p, mem.list);
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if (q->last_page == first_page)
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first_page++; /* first page was already allocated */
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}
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last_page = blk->last_page;
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if ((p = blk->mem.list.next) != &hdr->block) {
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q = get_emu10k1_memblk(p, mem.list);
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if (q->first_page == last_page)
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last_page--; /* last page was already allocated */
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}
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*first_page_ret = first_page;
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*last_page_ret = last_page;
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}
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/* release allocated pages */
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static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
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int last_page)
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{
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int page;
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for (page = first_page; page <= last_page; page++) {
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free_page((unsigned long)emu->page_ptr_table[page]);
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emu->page_addr_table[page] = 0;
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emu->page_ptr_table[page] = NULL;
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}
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}
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/*
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* allocate kernel pages
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*/
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static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
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{
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int page, first_page, last_page;
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emu10k1_memblk_init(blk);
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get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
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/* allocate kernel pages */
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for (page = first_page; page <= last_page; page++) {
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/* first try to allocate from <4GB zone */
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struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
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__GFP_NOWARN);
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if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
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if (p)
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__free_page(p);
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/* try to allocate from <16MB zone */
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p = alloc_page(GFP_ATOMIC | GFP_DMA |
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__GFP_NORETRY | /* no OOM-killer */
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__GFP_NOWARN);
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}
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if (!p) {
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__synth_free_pages(emu, first_page, page - 1);
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return -ENOMEM;
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}
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emu->page_addr_table[page] = page_to_phys(p);
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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);
|