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memory.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
#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);
            snd_assert(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_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
      struct snd_util_memhdr *hdr;
      struct snd_emu10k1_memblk *blk;
      int page, err, idx;

      snd_assert(emu, return NULL);
      snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL);
      hdr = emu->memhdr;
      snd_assert(hdr, return NULL);

      mutex_lock(&hdr->block_mutex);
      blk = search_empty(emu, runtime->dma_bytes);
      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++) {
            dma_addr_t addr;
#ifdef CONFIG_SND_DEBUG
            if (idx >= sgbuf->pages) {
                  printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n",
                         blk->first_page, blk->last_page, sgbuf->pages);
                  mutex_unlock(&hdr->block_mutex);
                  return NULL;
            }
#endif
            addr = sgbuf->table[idx].addr;
            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)
{
      snd_assert(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;
}

/*
 * allocate kernel pages
 */
static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
      int page, first_page, last_page;
      struct snd_dma_buffer dmab;

      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++) {
            if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(emu->pci),
                              PAGE_SIZE, &dmab) < 0)
                  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;
      }
      return 0;

__fail:
      /* release allocated pages */
      last_page = page - 1;
      for (page = first_page; page <= last_page; page++) {
            dmab.area = emu->page_ptr_table[page];
            dmab.addr = emu->page_addr_table[page];
            dmab.bytes = PAGE_SIZE;
            snd_dma_free_pages(&dmab);
            emu->page_addr_table[page] = 0;
            emu->page_ptr_table[page] = NULL;
      }

      return -ENOMEM;
}

/*
 * free pages
 */
static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
      int page, first_page, last_page;
      struct snd_dma_buffer dmab;

      get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
      dmab.dev.type = SNDRV_DMA_TYPE_DEV;
      dmab.dev.dev = snd_dma_pci_data(emu->pci);
      for (page = first_page; page <= last_page; page++) {
            if (emu->page_ptr_table[page] == NULL)
                  continue;
            dmab.area = emu->page_ptr_table[page];
            dmab.addr = emu->page_addr_table[page];
            dmab.bytes = PAGE_SIZE;
            snd_dma_free_pages(&dmab);
            emu->page_addr_table[page] = 0;
            emu->page_ptr_table[page] = NULL;
      }

      return 0;
}

/* calculate buffer pointer from offset address */
static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
{
      char *ptr;
      snd_assert(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);

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