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621 lines
17 KiB
621 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* Copyright (c) by Takashi Iwai <[email protected]> |
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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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#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 <linux/export.h> |
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|
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#include <sound/core.h> |
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#include <sound/emu10k1.h> |
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|
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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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(((__le32 *)(emu)->ptb_pages.area)[page] = \ |
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cpu_to_le32(((addr) << (emu->address_mode)) | (page))) |
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#define __get_ptb_entry(emu, page) \ |
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(le32_to_cpu(((__le32 *)(emu)->ptb_pages.area)[page])) |
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|
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#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE) |
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#define MAX_ALIGN_PAGES0 (MAXPAGES0 / UNIT_PAGES) |
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#define MAX_ALIGN_PAGES1 (MAXPAGES1 / 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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|
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#if PAGE_SIZE == EMUPAGESIZE && !IS_ENABLED(CONFIG_DYNAMIC_DEBUG) |
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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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dev_dbg(emu->card->dev, "mapped page %d to entry %.8x\n", page, |
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(unsigned int)__get_ptb_entry(emu, page)); |
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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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dev_dbg(emu->card->dev, "mapped silent page %d to entry %.8x\n", |
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page, (unsigned int)__get_ptb_entry(emu, page)); |
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} |
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} |
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#endif /* PAGE_SIZE */ |
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|
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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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|
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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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|
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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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/* |
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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 = 1, 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 = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - 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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if (page == 0) { |
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dev_err(emu->card->dev, "trying to map zero (reserved) page\n"); |
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return -EINVAL; |
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} |
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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 = 1; |
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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 = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0); |
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|
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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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dev_err_ratelimited(emu->card->dev, |
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"max memory size is 0x%lx (addr = 0x%lx)!!\n", |
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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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dev_err_ratelimited(emu->card->dev, "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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/* |
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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 unused 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_move_tail(&blk->mapped_order_link, |
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&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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/* |
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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 >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * 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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|
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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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if (ofs >= runtime->dma_bytes) |
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addr = emu->silent_page.addr; |
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else |
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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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dev_err_ratelimited(emu->card->dev, |
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"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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|
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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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/* |
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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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/* |
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* allocate DMA pages, widening the allocation if necessary |
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* |
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* See the comment above snd_emu10k1_detect_iommu() in emu10k1_main.c why |
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* this might be needed. |
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* |
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* If you modify this function check whether __synth_free_pages() also needs |
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* changes. |
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*/ |
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int snd_emu10k1_alloc_pages_maybe_wider(struct snd_emu10k1 *emu, size_t size, |
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struct snd_dma_buffer *dmab) |
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{ |
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if (emu->iommu_workaround) { |
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size_t npages = DIV_ROUND_UP(size, PAGE_SIZE); |
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size_t size_real = npages * PAGE_SIZE; |
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|
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/* |
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* The device has been observed to accesses up to 256 extra |
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* bytes, but use 1k to be safe. |
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*/ |
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if (size_real < size + 1024) |
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size += PAGE_SIZE; |
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} |
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|
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return snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, |
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&emu->pci->dev, size, dmab); |
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} |
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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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/* |
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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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|
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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 */ |
|
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) |
|
{ |
|
struct list_head *p; |
|
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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struct snd_dma_buffer dmab; |
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int page; |
|
|
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dmab.dev.type = SNDRV_DMA_TYPE_DEV; |
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dmab.dev.dev = &emu->pci->dev; |
|
|
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for (page = first_page; page <= last_page; page++) { |
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if (emu->page_ptr_table[page] == NULL) |
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continue; |
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dmab.area = emu->page_ptr_table[page]; |
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dmab.addr = emu->page_addr_table[page]; |
|
|
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/* |
|
* please keep me in sync with logic in |
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* snd_emu10k1_alloc_pages_maybe_wider() |
|
*/ |
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dmab.bytes = PAGE_SIZE; |
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if (emu->iommu_workaround) |
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dmab.bytes *= 2; |
|
|
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snd_dma_free_pages(&dmab); |
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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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* allocate kernel pages |
|
*/ |
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static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
|
{ |
|
int page, first_page, last_page; |
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struct snd_dma_buffer dmab; |
|
|
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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 */ |
|
for (page = first_page; page <= last_page; page++) { |
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if (snd_emu10k1_alloc_pages_maybe_wider(emu, PAGE_SIZE, |
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&dmab) < 0) |
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goto __fail; |
|
if (!is_valid_page(emu, dmab.addr)) { |
|
snd_dma_free_pages(&dmab); |
|
goto __fail; |
|
} |
|
emu->page_addr_table[page] = dmab.addr; |
|
emu->page_ptr_table[page] = dmab.area; |
|
} |
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return 0; |
|
|
|
__fail: |
|
/* release allocated pages */ |
|
last_page = page - 1; |
|
__synth_free_pages(emu, first_page, last_page); |
|
|
|
return -ENOMEM; |
|
} |
|
|
|
/* |
|
* free pages |
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*/ |
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static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
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{ |
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int first_page, last_page; |
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|
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get_single_page_range(emu->memhdr, blk, &first_page, &last_page); |
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__synth_free_pages(emu, first_page, last_page); |
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return 0; |
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} |
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|
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/* calculate buffer pointer from offset address */ |
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static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) |
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{ |
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char *ptr; |
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if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) |
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return NULL; |
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ptr = emu->page_ptr_table[page]; |
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if (! ptr) { |
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dev_err(emu->card->dev, |
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"access to NULL ptr: page = %d\n", page); |
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return NULL; |
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} |
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ptr += offset & (PAGE_SIZE - 1); |
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return (void*)ptr; |
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} |
|
|
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/* |
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* bzero(blk + offset, size) |
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*/ |
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int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
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int offset, int size) |
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{ |
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int page, nextofs, end_offset, temp, temp1; |
|
void *ptr; |
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struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
|
|
|
offset += blk->offset & (PAGE_SIZE - 1); |
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end_offset = offset + size; |
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page = get_aligned_page(offset); |
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do { |
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nextofs = aligned_page_offset(page + 1); |
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temp = nextofs - offset; |
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temp1 = end_offset - offset; |
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if (temp1 < temp) |
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temp = temp1; |
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ptr = offset_ptr(emu, page + p->first_page, offset); |
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if (ptr) |
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memset(ptr, 0, temp); |
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offset = nextofs; |
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page++; |
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} while (offset < end_offset); |
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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);
|
|
|