572 lines
16 KiB
C
572 lines
16 KiB
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;
|
|
|
|
idx = runtime->period_size >= runtime->buffer_size ?
|
|
(emu->delay_pcm_irq * 2) : 0;
|
|
mutex_lock(&hdr->block_mutex);
|
|
blk = search_empty(emu, runtime->dma_bytes + idx);
|
|
if (blk == NULL) {
|
|
mutex_unlock(&hdr->block_mutex);
|
|
return NULL;
|
|
}
|
|
/* fill buffer addresses but pointers are not stored so that
|
|
* snd_free_pci_page() is not called in in synth_free()
|
|
*/
|
|
idx = 0;
|
|
for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
|
|
unsigned long ofs = idx << PAGE_SHIFT;
|
|
dma_addr_t addr;
|
|
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);
|