Quelle  gus_mem.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  GUS's memory allocation routines / bottom layer
 */

#include <linux/slab.h>
#include <linux/string.h>
#include <sound/core.h>
#include <sound/gus.h>
#include <sound/info.h>

#ifdef CONFIG_SND_DEBUG
static void snd_gf1_mem_info_read(struct snd_info_entry *entry, 
      struct snd_info_buffer *buffer);
#endif

void snd_gf1_mem_lock(struct snd_gf1_mem * alloc, int xup)
{
 if (!xup) {
  mutex_lock(&alloc->memory_mutex);
 } else {
  mutex_unlock(&alloc->memory_mutex);
 }
}

static struct snd_gf1_mem_block *
snd_gf1_mem_xalloc(struct snd_gf1_mem *alloc, struct snd_gf1_mem_block *block,
     const char *name)
{
 struct snd_gf1_mem_block *pblock, *nblock;

 nblock = kmalloc(sizeof(struct snd_gf1_mem_block), GFP_KERNEL);
 if (nblock == NULL)
  return NULL;
 *nblock = *block;
 nblock->name = kstrdup(name, GFP_KERNEL);
 if (!nblock->name) {
  kfree(nblock);
  return NULL;
 }

 pblock = alloc->first;
 while (pblock) {
  if (pblock->ptr > nblock->ptr) {
   nblock->prev = pblock->prev;
   nblock->next = pblock;
   pblock->prev = nblock;
   if (pblock == alloc->first)
    alloc->first = nblock;
   else
    nblock->prev->next = nblock;
   mutex_unlock(&alloc->memory_mutex);
   return nblock;
  }
  pblock = pblock->next;
 }
 nblock->next = NULL;
 if (alloc->last == NULL) {
  nblock->prev = NULL;
  alloc->first = alloc->last = nblock;
 } else {
  nblock->prev = alloc->last;
  alloc->last->next = nblock;
  alloc->last = nblock;
 }
 return nblock;
}

int snd_gf1_mem_xfree(struct snd_gf1_mem * alloc, struct snd_gf1_mem_block * block)
{
 if (block->share) { /* ok.. shared block */
  block->share--;
  mutex_unlock(&alloc->memory_mutex);
  return 0;
 }
 if (alloc->first == block) {
  alloc->first = block->next;
  if (block->next)
   block->next->prev = NULL;
 } else {
  block->prev->next = block->next;
  if (block->next)
   block->next->prev = block->prev;
 }
 if (alloc->last == block) {
  alloc->last = block->prev;
  if (block->prev)
   block->prev->next = NULL;
 } else {
  block->next->prev = block->prev;
  if (block->prev)
   block->prev->next = block->next;
 }
 kfree(block->name);
 kfree(block);
 return 0;
}

static struct snd_gf1_mem_block *snd_gf1_mem_look(struct snd_gf1_mem * alloc,
          unsigned int address)
{
 struct snd_gf1_mem_block *block;

 for (block = alloc->first; block; block = block->next) {
  if (block->ptr == address) {
   return block;
  }
 }
 return NULL;
}

static struct snd_gf1_mem_block *snd_gf1_mem_share(struct snd_gf1_mem * alloc,
           unsigned int *share_id)
{
 struct snd_gf1_mem_block *block;

 if (!share_id[0] && !share_id[1] &&
     !share_id[2] && !share_id[3])
  return NULL;
 for (block = alloc->first; block; block = block->next)
  if (!memcmp(share_id, block->share_id,
    sizeof(block->share_id)))
   return block;
 return NULL;
}

static int snd_gf1_mem_find(struct snd_gf1_mem * alloc,
       struct snd_gf1_mem_block * block,
       unsigned int size, int w_16, int align)
{
 struct snd_gf1_bank_info *info = w_16 ? alloc->banks_16 : alloc->banks_8;
 unsigned int idx, boundary;
 int size1;
 struct snd_gf1_mem_block *pblock;
 unsigned int ptr1, ptr2;

 if (w_16 && align < 2)
  align = 2;
 block->flags = w_16 ? SNDRV_GF1_MEM_BLOCK_16BIT : 0;
 block->owner = SNDRV_GF1_MEM_OWNER_DRIVER;
 block->share = 0;
 block->share_id[0] = block->share_id[1] =
 block->share_id[2] = block->share_id[3] = 0;
 block->name = NULL;
 block->prev = block->next = NULL;
 for (pblock = alloc->first, idx = 0; pblock; pblock = pblock->next) {
  while (pblock->ptr >= (boundary = info[idx].address + info[idx].size))
   idx++;
  while (pblock->ptr + pblock->size >= (boundary = info[idx].address + info[idx].size))
   idx++;
  ptr2 = boundary;
  if (pblock->next) {
   if (pblock->ptr + pblock->size == pblock->next->ptr)
    continue;
   if (pblock->next->ptr < boundary)
    ptr2 = pblock->next->ptr;
  }
  ptr1 = ALIGN(pblock->ptr + pblock->size, align);
  if (ptr1 >= ptr2)
   continue;
  size1 = ptr2 - ptr1;
  if ((int)size <= size1) {
   block->ptr = ptr1;
   block->size = size;
   return 0;
  }
 }
 while (++idx < 4) {
  if (size <= info[idx].size) {
   /* I assume that bank address is already aligned.. */
   block->ptr = info[idx].address;
   block->size = size;
   return 0;
  }
 }
 return -ENOMEM;
}

struct snd_gf1_mem_block *snd_gf1_mem_alloc(struct snd_gf1_mem * alloc, int owner,
           char *name, int size, int w_16, int align,
           unsigned int *share_id)
{
 struct snd_gf1_mem_block block, *nblock;

 snd_gf1_mem_lock(alloc, 0);
 if (share_id != NULL) {
  nblock = snd_gf1_mem_share(alloc, share_id);
  if (nblock != NULL) {
   if (size != (int)nblock->size) {
    /* TODO: remove in the future */
    pr_err("%s - share: sizes differ\n", __func__);
    goto __std;
   }
   nblock->share++;
   snd_gf1_mem_lock(alloc, 1);
   return NULL;
  }
 }
      __std:
 if (snd_gf1_mem_find(alloc, &block, size, w_16, align) < 0) {
  snd_gf1_mem_lock(alloc, 1);
  return NULL;
 }
 if (share_id != NULL)
  memcpy(&block.share_id, share_id, sizeof(block.share_id));
 block.owner = owner;
 nblock = snd_gf1_mem_xalloc(alloc, &block, name);
 snd_gf1_mem_lock(alloc, 1);
 return nblock;
}

int snd_gf1_mem_free(struct snd_gf1_mem * alloc, unsigned int address)
{
 int result;
 struct snd_gf1_mem_block *block;

 snd_gf1_mem_lock(alloc, 0);
 block = snd_gf1_mem_look(alloc, address);
 if (block) {
  result = snd_gf1_mem_xfree(alloc, block);
  snd_gf1_mem_lock(alloc, 1);
  return result;
 }
 snd_gf1_mem_lock(alloc, 1);
 return -EINVAL;
}

int snd_gf1_mem_init(struct snd_gus_card * gus)
{
 struct snd_gf1_mem *alloc;
 struct snd_gf1_mem_block block;

 alloc = &gus->gf1.mem_alloc;
 mutex_init(&alloc->memory_mutex);
 alloc->first = alloc->last = NULL;
 if (!gus->gf1.memory)
  return 0;

 memset(&block, 0, sizeof(block));
 block.owner = SNDRV_GF1_MEM_OWNER_DRIVER;
 if (gus->gf1.enh_mode) {
  block.ptr = 0;
  block.size = 1024;
  if (!snd_gf1_mem_xalloc(alloc, &block, "InterWave LFOs"))
   return -ENOMEM;
 }
 block.ptr = gus->gf1.default_voice_address;
 block.size = 4;
 if (!snd_gf1_mem_xalloc(alloc, &block, "Voice default (NULL's)"))
  return -ENOMEM;
#ifdef CONFIG_SND_DEBUG
 snd_card_ro_proc_new(gus->card, "gusmem", gus, snd_gf1_mem_info_read);
#endif
 return 0;
}

int snd_gf1_mem_done(struct snd_gus_card * gus)
{
 struct snd_gf1_mem *alloc;
 struct snd_gf1_mem_block *block, *nblock;

 alloc = &gus->gf1.mem_alloc;
 block = alloc->first;
 while (block) {
  nblock = block->next;
  snd_gf1_mem_xfree(alloc, block);
  block = nblock;
 }
 return 0;
}

#ifdef CONFIG_SND_DEBUG
static void snd_gf1_mem_info_read(struct snd_info_entry *entry, 
      struct snd_info_buffer *buffer)
{
 struct snd_gus_card *gus;
 struct snd_gf1_mem *alloc;
 struct snd_gf1_mem_block *block;
 unsigned int total, used;
 int i;

 gus = entry->private_data;
 alloc = &gus->gf1.mem_alloc;
 mutex_lock(&alloc->memory_mutex);
 snd_iprintf(buffer, "8-bit banks : \n ");
 for (i = 0; i < 4; i++)
  snd_iprintf(buffer, "0x%06x (%04ik)%s", alloc->banks_8[i].address, alloc->banks_8[i].size >> 10, i + 1 < 4 ? "," : "");
 snd_iprintf(buffer, "\n"
      "16-bit banks : \n ");
 for (i = total = 0; i < 4; i++) {
  snd_iprintf(buffer, "0x%06x (%04ik)%s", alloc->banks_16[i].address, alloc->banks_16[i].size >> 10, i + 1 < 4 ? "," : "");
  total += alloc->banks_16[i].size;
 }
 snd_iprintf(buffer, "\n");
 used = 0;
 for (block = alloc->first, i = 0; block; block = block->next, i++) {
  used += block->size;
  snd_iprintf(buffer, "Block %i onboard 0x%x size %i (0x%x):\n", i, block->ptr, block->size, block->size);
  if (block->share ||
      block->share_id[0] || block->share_id[1] ||
      block->share_id[2] || block->share_id[3])
   snd_iprintf(buffer, " Share : %i [id0 0x%x] [id1 0x%x] [id2 0x%x] [id3 0x%x]\n",
    block->share,
    block->share_id[0], block->share_id[1],
    block->share_id[2], block->share_id[3]);
  snd_iprintf(buffer, " Flags :%s\n",
  block->flags & SNDRV_GF1_MEM_BLOCK_16BIT ? " 16-bit" : "");
  snd_iprintf(buffer, " Owner : ");
  switch (block->owner) {
  case SNDRV_GF1_MEM_OWNER_DRIVER:
   snd_iprintf(buffer, "driver - %s\n", block->name);
   break;
  case SNDRV_GF1_MEM_OWNER_WAVE_SIMPLE:
   snd_iprintf(buffer, "SIMPLE wave\n");
   break;
  case SNDRV_GF1_MEM_OWNER_WAVE_GF1:
   snd_iprintf(buffer, "GF1 wave\n");
   break;
  case SNDRV_GF1_MEM_OWNER_WAVE_IWFFFF:
   snd_iprintf(buffer, "IWFFFF wave\n");
   break;
  default:
   snd_iprintf(buffer, "unknown\n");
  }
 }
 snd_iprintf(buffer, " Total: memory = %i, used = %i, free = %i\n",
      total, used, total - used);
 mutex_unlock(&alloc->memory_mutex);
#if 0
 ultra_iprintf(buffer, " Verify: free = %i, max 8-bit block = %i, max 16-bit block = %i\n",
        ultra_memory_free_size(card, &card->gf1.mem_alloc),
    ultra_memory_free_block(card, &card->gf1.mem_alloc, 0),
   ultra_memory_free_block(card, &card->gf1.mem_alloc, 1));
#endif
}
#endif