diff options
Diffstat (limited to 'sound/pci/emu10k1/memory.c')
| -rw-r--r-- | sound/pci/emu10k1/memory.c | 581 |
1 files changed, 581 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/memory.c b/sound/pci/emu10k1/memory.c new file mode 100644 index 000000000..4f1f69be1 --- /dev/null +++ b/sound/pci/emu10k1/memory.c @@ -0,0 +1,581 @@ +/* + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Copyright (c) by Takashi Iwai <tiwai@suse.de> + * + * EMU10K1 memory page allocation (PTB area) + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/pci.h> +#include <linux/gfp.h> +#include <linux/time.h> +#include <linux/mutex.h> +#include <linux/export.h> + +#include <sound/core.h> +#include <sound/emu10k1.h> + +/* page arguments of these two macros are Emu page (4096 bytes), not like + * aligned pages in others + */ +#define __set_ptb_entry(emu,page,addr) \ + (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << (emu->address_mode)) | (page))) + +#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE) +#define MAX_ALIGN_PAGES0 (MAXPAGES0 / UNIT_PAGES) +#define MAX_ALIGN_PAGES1 (MAXPAGES1 / UNIT_PAGES) +/* get aligned page from offset address */ +#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) +/* get offset address from aligned page */ +#define aligned_page_offset(page) ((page) << PAGE_SHIFT) + +#if PAGE_SIZE == 4096 +/* page size == EMUPAGESIZE */ +/* fill PTB entrie(s) corresponding to page with addr */ +#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) +/* fill PTB entrie(s) corresponding to page with silence pointer */ +#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) +#else +/* fill PTB entries -- we need to fill UNIT_PAGES entries */ +static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr) +{ + int i; + page *= UNIT_PAGES; + for (i = 0; i < UNIT_PAGES; i++, page++) { + __set_ptb_entry(emu, page, addr); + addr += EMUPAGESIZE; + } +} +static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page) +{ + int i; + page *= UNIT_PAGES; + for (i = 0; i < UNIT_PAGES; i++, page++) + /* do not increment ptr */ + __set_ptb_entry(emu, page, emu->silent_page.addr); +} +#endif /* PAGE_SIZE */ + + +/* + */ +static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); +static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); + +#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member) + + +/* initialize emu10k1 part */ +static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk) +{ + blk->mapped_page = -1; + INIT_LIST_HEAD(&blk->mapped_link); + INIT_LIST_HEAD(&blk->mapped_order_link); + blk->map_locked = 0; + + blk->first_page = get_aligned_page(blk->mem.offset); + blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1); + blk->pages = blk->last_page - blk->first_page + 1; +} + +/* + * search empty region on PTB with the given size + * + * if an empty region is found, return the page and store the next mapped block + * in nextp + * if not found, return a negative error code. + */ +static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp) +{ + int page = 0, found_page = -ENOMEM; + int max_size = npages; + int size; + struct list_head *candidate = &emu->mapped_link_head; + struct list_head *pos; + + list_for_each (pos, &emu->mapped_link_head) { + struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link); + if (blk->mapped_page < 0) + continue; + size = blk->mapped_page - page; + if (size == npages) { + *nextp = pos; + return page; + } + else if (size > max_size) { + /* we look for the maximum empty hole */ + max_size = size; + candidate = pos; + found_page = page; + } + page = blk->mapped_page + blk->pages; + } + size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page; + if (size >= max_size) { + *nextp = pos; + return page; + } + *nextp = candidate; + return found_page; +} + +/* + * map a memory block onto emu10k1's PTB + * + * call with memblk_lock held + */ +static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) +{ + int page, pg; + struct list_head *next; + + page = search_empty_map_area(emu, blk->pages, &next); + if (page < 0) /* not found */ + return page; + /* insert this block in the proper position of mapped list */ + list_add_tail(&blk->mapped_link, next); + /* append this as a newest block in order list */ + list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); + blk->mapped_page = page; + /* fill PTB */ + for (pg = blk->first_page; pg <= blk->last_page; pg++) { + set_ptb_entry(emu, page, emu->page_addr_table[pg]); + page++; + } + return 0; +} + +/* + * unmap the block + * return the size of resultant empty pages + * + * call with memblk_lock held + */ +static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) +{ + int start_page, end_page, mpage, pg; + struct list_head *p; + struct snd_emu10k1_memblk *q; + + /* calculate the expected size of empty region */ + if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) { + q = get_emu10k1_memblk(p, mapped_link); + start_page = q->mapped_page + q->pages; + } else + start_page = 0; + if ((p = blk->mapped_link.next) != &emu->mapped_link_head) { + q = get_emu10k1_memblk(p, mapped_link); + end_page = q->mapped_page; + } else + end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0); + + /* remove links */ + list_del(&blk->mapped_link); + list_del(&blk->mapped_order_link); + /* clear PTB */ + mpage = blk->mapped_page; + for (pg = blk->first_page; pg <= blk->last_page; pg++) { + set_silent_ptb(emu, mpage); + mpage++; + } + blk->mapped_page = -1; + return end_page - start_page; /* return the new empty size */ +} + +/* + * search empty pages with the given size, and create a memory block + * + * unlike synth_alloc the memory block is aligned to the page start + */ +static struct snd_emu10k1_memblk * +search_empty(struct snd_emu10k1 *emu, int size) +{ + struct list_head *p; + struct snd_emu10k1_memblk *blk; + int page, psize; + + psize = get_aligned_page(size + PAGE_SIZE -1); + page = 0; + list_for_each(p, &emu->memhdr->block) { + blk = get_emu10k1_memblk(p, mem.list); + if (page + psize <= blk->first_page) + goto __found_pages; + page = blk->last_page + 1; + } + if (page + psize > emu->max_cache_pages) + return NULL; + +__found_pages: + /* create a new memory block */ + blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev); + if (blk == NULL) + return NULL; + blk->mem.offset = aligned_page_offset(page); /* set aligned offset */ + emu10k1_memblk_init(blk); + return blk; +} + + +/* + * check if the given pointer is valid for pages + */ +static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr) +{ + if (addr & ~emu->dma_mask) { + dev_err(emu->card->dev, + "max memory size is 0x%lx (addr = 0x%lx)!!\n", + emu->dma_mask, (unsigned long)addr); + return 0; + } + if (addr & (EMUPAGESIZE-1)) { + dev_err(emu->card->dev, "page is not aligned\n"); + return 0; + } + return 1; +} + +/* + * map the given memory block on PTB. + * if the block is already mapped, update the link order. + * if no empty pages are found, tries to release unused memory blocks + * and retry the mapping. + */ +int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) +{ + int err; + int size; + struct list_head *p, *nextp; + struct snd_emu10k1_memblk *deleted; + unsigned long flags; + + spin_lock_irqsave(&emu->memblk_lock, flags); + if (blk->mapped_page >= 0) { + /* update order link */ + list_move_tail(&blk->mapped_order_link, + &emu->mapped_order_link_head); + spin_unlock_irqrestore(&emu->memblk_lock, flags); + return 0; + } + if ((err = map_memblk(emu, blk)) < 0) { + /* no enough page - try to unmap some blocks */ + /* starting from the oldest block */ + p = emu->mapped_order_link_head.next; + for (; p != &emu->mapped_order_link_head; p = nextp) { + nextp = p->next; + deleted = get_emu10k1_memblk(p, mapped_order_link); + if (deleted->map_locked) + continue; + size = unmap_memblk(emu, deleted); + if (size >= blk->pages) { + /* ok the empty region is enough large */ + err = map_memblk(emu, blk); + break; + } + } + } + spin_unlock_irqrestore(&emu->memblk_lock, flags); + return err; +} + +EXPORT_SYMBOL(snd_emu10k1_memblk_map); + +/* + * page allocation for DMA + */ +struct snd_util_memblk * +snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_util_memhdr *hdr; + struct snd_emu10k1_memblk *blk; + int page, err, idx; + + if (snd_BUG_ON(!emu)) + return NULL; + if (snd_BUG_ON(runtime->dma_bytes <= 0 || + runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE)) + return NULL; + hdr = emu->memhdr; + if (snd_BUG_ON(!hdr)) + return NULL; + + idx = runtime->period_size >= runtime->buffer_size ? + (emu->delay_pcm_irq * 2) : 0; + mutex_lock(&hdr->block_mutex); + blk = search_empty(emu, runtime->dma_bytes + idx); + if (blk == NULL) { + mutex_unlock(&hdr->block_mutex); + return NULL; + } + /* fill buffer addresses but pointers are not stored so that + * snd_free_pci_page() is not called in in synth_free() + */ + idx = 0; + for (page = blk->first_page; page <= blk->last_page; page++, idx++) { + unsigned long ofs = idx << PAGE_SHIFT; + dma_addr_t addr; + if (ofs >= runtime->dma_bytes) + addr = emu->silent_page.addr; + else + addr = snd_pcm_sgbuf_get_addr(substream, ofs); + if (! is_valid_page(emu, addr)) { + dev_err(emu->card->dev, + "emu: failure page = %d\n", idx); + mutex_unlock(&hdr->block_mutex); + return NULL; + } + emu->page_addr_table[page] = addr; + emu->page_ptr_table[page] = NULL; + } + + /* set PTB entries */ + blk->map_locked = 1; /* do not unmap this block! */ + err = snd_emu10k1_memblk_map(emu, blk); + if (err < 0) { + __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); + mutex_unlock(&hdr->block_mutex); + return NULL; + } + mutex_unlock(&hdr->block_mutex); + return (struct snd_util_memblk *)blk; +} + + +/* + * release DMA buffer from page table + */ +int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk) +{ + if (snd_BUG_ON(!emu || !blk)) + return -EINVAL; + return snd_emu10k1_synth_free(emu, blk); +} + + +/* + * memory allocation using multiple pages (for synth) + * Unlike the DMA allocation above, non-contiguous pages are assined. + */ + +/* + * allocate a synth sample area + */ +struct snd_util_memblk * +snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) +{ + struct snd_emu10k1_memblk *blk; + struct snd_util_memhdr *hdr = hw->memhdr; + + mutex_lock(&hdr->block_mutex); + blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); + if (blk == NULL) { + mutex_unlock(&hdr->block_mutex); + return NULL; + } + if (synth_alloc_pages(hw, blk)) { + __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); + mutex_unlock(&hdr->block_mutex); + return NULL; + } + snd_emu10k1_memblk_map(hw, blk); + mutex_unlock(&hdr->block_mutex); + return (struct snd_util_memblk *)blk; +} + +EXPORT_SYMBOL(snd_emu10k1_synth_alloc); + +/* + * free a synth sample area + */ +int +snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) +{ + struct snd_util_memhdr *hdr = emu->memhdr; + struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; + unsigned long flags; + + mutex_lock(&hdr->block_mutex); + spin_lock_irqsave(&emu->memblk_lock, flags); + if (blk->mapped_page >= 0) + unmap_memblk(emu, blk); + spin_unlock_irqrestore(&emu->memblk_lock, flags); + synth_free_pages(emu, blk); + __snd_util_mem_free(hdr, memblk); + mutex_unlock(&hdr->block_mutex); + return 0; +} + +EXPORT_SYMBOL(snd_emu10k1_synth_free); + +/* check new allocation range */ +static void get_single_page_range(struct snd_util_memhdr *hdr, + struct snd_emu10k1_memblk *blk, + int *first_page_ret, int *last_page_ret) +{ + struct list_head *p; + struct snd_emu10k1_memblk *q; + int first_page, last_page; + first_page = blk->first_page; + if ((p = blk->mem.list.prev) != &hdr->block) { + q = get_emu10k1_memblk(p, mem.list); + if (q->last_page == first_page) + first_page++; /* first page was already allocated */ + } + last_page = blk->last_page; + if ((p = blk->mem.list.next) != &hdr->block) { + q = get_emu10k1_memblk(p, mem.list); + if (q->first_page == last_page) + last_page--; /* last page was already allocated */ + } + *first_page_ret = first_page; + *last_page_ret = last_page; +} + +/* release allocated pages */ +static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, + int last_page) +{ + int page; + + for (page = first_page; page <= last_page; page++) { + free_page((unsigned long)emu->page_ptr_table[page]); + emu->page_addr_table[page] = 0; + emu->page_ptr_table[page] = NULL; + } +} + +/* + * allocate kernel pages + */ +static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) +{ + int page, first_page, last_page; + + emu10k1_memblk_init(blk); + get_single_page_range(emu->memhdr, blk, &first_page, &last_page); + /* allocate kernel pages */ + for (page = first_page; page <= last_page; page++) { + /* first try to allocate from <4GB zone */ + struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 | + __GFP_NOWARN); + if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) { + if (p) + __free_page(p); + /* try to allocate from <16MB zone */ + p = alloc_page(GFP_ATOMIC | GFP_DMA | + __GFP_NORETRY | /* no OOM-killer */ + __GFP_NOWARN); + } + if (!p) { + __synth_free_pages(emu, first_page, page - 1); + return -ENOMEM; + } + emu->page_addr_table[page] = page_to_phys(p); + emu->page_ptr_table[page] = page_address(p); + } + return 0; +} + +/* + * free pages + */ +static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) +{ + int first_page, last_page; + + get_single_page_range(emu->memhdr, blk, &first_page, &last_page); + __synth_free_pages(emu, first_page, last_page); + return 0; +} + +/* calculate buffer pointer from offset address */ +static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) +{ + char *ptr; + if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) + return NULL; + ptr = emu->page_ptr_table[page]; + if (! ptr) { + dev_err(emu->card->dev, + "access to NULL ptr: page = %d\n", page); + return NULL; + } + ptr += offset & (PAGE_SIZE - 1); + return (void*)ptr; +} + +/* + * bzero(blk + offset, size) + */ +int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, + int offset, int size) +{ + int page, nextofs, end_offset, temp, temp1; + void *ptr; + struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; + + offset += blk->offset & (PAGE_SIZE - 1); + end_offset = offset + size; + page = get_aligned_page(offset); + do { + nextofs = aligned_page_offset(page + 1); + temp = nextofs - offset; + temp1 = end_offset - offset; + if (temp1 < temp) + temp = temp1; + ptr = offset_ptr(emu, page + p->first_page, offset); + if (ptr) + memset(ptr, 0, temp); + offset = nextofs; + page++; + } while (offset < end_offset); + return 0; +} + +EXPORT_SYMBOL(snd_emu10k1_synth_bzero); + +/* + * copy_from_user(blk + offset, data, size) + */ +int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, + int offset, const char __user *data, int size) +{ + int page, nextofs, end_offset, temp, temp1; + void *ptr; + struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; + + offset += blk->offset & (PAGE_SIZE - 1); + end_offset = offset + size; + page = get_aligned_page(offset); + do { + nextofs = aligned_page_offset(page + 1); + temp = nextofs - offset; + temp1 = end_offset - offset; + if (temp1 < temp) + temp = temp1; + ptr = offset_ptr(emu, page + p->first_page, offset); + if (ptr && copy_from_user(ptr, data, temp)) + return -EFAULT; + offset = nextofs; + data += temp; + page++; + } while (offset < end_offset); + return 0; +} + +EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user); |