--- /dev/null
+/*
+ * 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);
Code Review / kvmfornfv.git / blobdiff