linux/sound/pci/trident/trident_memory.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5 *  Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
   6 *
   7 *  Trident 4DWave-NX memory page allocation (TLB area)
   8 *  Trident chip can handle only 16MByte of the memory at the same time.
   9 */
  10
  11#include <linux/io.h>
  12#include <linux/pci.h>
  13#include <linux/time.h>
  14#include <linux/mutex.h>
  15
  16#include <sound/core.h>
  17#include "trident.h"
  18
  19/* page arguments of these two macros are Trident page (4096 bytes), not like
  20 * aligned pages in others
  21 */
  22#define __set_tlb_bus(trident,page,addr) \
  23        (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1))
  24#define __tlb_to_addr(trident,page) \
  25        (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
  26
  27#if PAGE_SIZE == 4096
  28/* page size == SNDRV_TRIDENT_PAGE_SIZE */
  29#define ALIGN_PAGE_SIZE         PAGE_SIZE       /* minimum page size for allocation */
  30#define MAX_ALIGN_PAGES         SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
  31/* fill TLB entrie(s) corresponding to page with ptr */
  32#define set_tlb_bus(trident,page,addr) __set_tlb_bus(trident,page,addr)
  33/* fill TLB entrie(s) corresponding to page with silence pointer */
  34#define set_silent_tlb(trident,page)    __set_tlb_bus(trident, page, trident->tlb.silent_page.addr)
  35/* get aligned page from offset address */
  36#define get_aligned_page(offset)        ((offset) >> 12)
  37/* get offset address from aligned page */
  38#define aligned_page_offset(page)       ((page) << 12)
  39/* get PCI physical address from aligned page */
  40#define page_to_addr(trident,page)      __tlb_to_addr(trident, page)
  41
  42#elif PAGE_SIZE == 8192
  43/* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
  44#define ALIGN_PAGE_SIZE         PAGE_SIZE
  45#define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / 2)
  46#define get_aligned_page(offset)        ((offset) >> 13)
  47#define aligned_page_offset(page)       ((page) << 13)
  48#define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) << 1)
  49
  50/* fill TLB entries -- we need to fill two entries */
  51static inline void set_tlb_bus(struct snd_trident *trident, int page,
  52                               dma_addr_t addr)
  53{
  54        page <<= 1;
  55        __set_tlb_bus(trident, page, addr);
  56        __set_tlb_bus(trident, page+1, addr + SNDRV_TRIDENT_PAGE_SIZE);
  57}
  58static inline void set_silent_tlb(struct snd_trident *trident, int page)
  59{
  60        page <<= 1;
  61        __set_tlb_bus(trident, page, trident->tlb.silent_page.addr);
  62        __set_tlb_bus(trident, page+1, trident->tlb.silent_page.addr);
  63}
  64
  65#else
  66/* arbitrary size */
  67#define UNIT_PAGES              (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
  68#define ALIGN_PAGE_SIZE         (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
  69#define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
  70/* Note: if alignment doesn't match to the maximum size, the last few blocks
  71 * become unusable.  To use such blocks, you'll need to check the validity
  72 * of accessing page in set_tlb_bus and set_silent_tlb.  search_empty()
  73 * should also check it, too.
  74 */
  75#define get_aligned_page(offset)        ((offset) / ALIGN_PAGE_SIZE)
  76#define aligned_page_offset(page)       ((page) * ALIGN_PAGE_SIZE)
  77#define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) * UNIT_PAGES)
  78
  79/* fill TLB entries -- UNIT_PAGES entries must be filled */
  80static inline void set_tlb_bus(struct snd_trident *trident, int page,
  81                               dma_addr_t addr)
  82{
  83        int i;
  84        page *= UNIT_PAGES;
  85        for (i = 0; i < UNIT_PAGES; i++, page++) {
  86                __set_tlb_bus(trident, page, addr);
  87                addr += SNDRV_TRIDENT_PAGE_SIZE;
  88        }
  89}
  90static inline void set_silent_tlb(struct snd_trident *trident, int page)
  91{
  92        int i;
  93        page *= UNIT_PAGES;
  94        for (i = 0; i < UNIT_PAGES; i++, page++)
  95                __set_tlb_bus(trident, page, trident->tlb.silent_page.addr);
  96}
  97
  98#endif /* PAGE_SIZE */
  99
 100/* first and last (aligned) pages of memory block */
 101#define firstpg(blk)    (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
 102#define lastpg(blk)     (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
 103
 104/*
 105 * search empty pages which may contain given size
 106 */
 107static struct snd_util_memblk *
 108search_empty(struct snd_util_memhdr *hdr, int size)
 109{
 110        struct snd_util_memblk *blk;
 111        int page, psize;
 112        struct list_head *p;
 113
 114        psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
 115        page = 0;
 116        list_for_each(p, &hdr->block) {
 117                blk = list_entry(p, struct snd_util_memblk, list);
 118                if (page + psize <= firstpg(blk))
 119                        goto __found_pages;
 120                page = lastpg(blk) + 1;
 121        }
 122        if (page + psize > MAX_ALIGN_PAGES)
 123                return NULL;
 124
 125__found_pages:
 126        /* create a new memory block */
 127        blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
 128        if (blk == NULL)
 129                return NULL;
 130        blk->offset = aligned_page_offset(page); /* set aligned offset */
 131        firstpg(blk) = page;
 132        lastpg(blk) = page + psize - 1;
 133        return blk;
 134}
 135
 136
 137/*
 138 * check if the given pointer is valid for pages
 139 */
 140static int is_valid_page(unsigned long ptr)
 141{
 142        if (ptr & ~0x3fffffffUL) {
 143                snd_printk(KERN_ERR "max memory size is 1GB!!\n");
 144                return 0;
 145        }
 146        if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
 147                snd_printk(KERN_ERR "page is not aligned\n");
 148                return 0;
 149        }
 150        return 1;
 151}
 152
 153/*
 154 * page allocation for DMA (Scatter-Gather version)
 155 */
 156static struct snd_util_memblk *
 157snd_trident_alloc_sg_pages(struct snd_trident *trident,
 158                           struct snd_pcm_substream *substream)
 159{
 160        struct snd_util_memhdr *hdr;
 161        struct snd_util_memblk *blk;
 162        struct snd_pcm_runtime *runtime = substream->runtime;
 163        int idx, page;
 164
 165        if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 166                       runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
 167                                        SNDRV_TRIDENT_PAGE_SIZE))
 168                return NULL;
 169        hdr = trident->tlb.memhdr;
 170        if (snd_BUG_ON(!hdr))
 171                return NULL;
 172
 173        
 174
 175        mutex_lock(&hdr->block_mutex);
 176        blk = search_empty(hdr, runtime->dma_bytes);
 177        if (blk == NULL) {
 178                mutex_unlock(&hdr->block_mutex);
 179                return NULL;
 180        }
 181                           
 182        /* set TLB entries */
 183        idx = 0;
 184        for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
 185                unsigned long ofs = idx << PAGE_SHIFT;
 186                dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 187                if (! is_valid_page(addr)) {
 188                        __snd_util_mem_free(hdr, blk);
 189                        mutex_unlock(&hdr->block_mutex);
 190                        return NULL;
 191                }
 192                set_tlb_bus(trident, page, addr);
 193        }
 194        mutex_unlock(&hdr->block_mutex);
 195        return blk;
 196}
 197
 198/*
 199 * page allocation for DMA (contiguous version)
 200 */
 201static struct snd_util_memblk *
 202snd_trident_alloc_cont_pages(struct snd_trident *trident,
 203                             struct snd_pcm_substream *substream)
 204{
 205        struct snd_util_memhdr *hdr;
 206        struct snd_util_memblk *blk;
 207        int page;
 208        struct snd_pcm_runtime *runtime = substream->runtime;
 209        dma_addr_t addr;
 210
 211        if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 212                       runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
 213                                        SNDRV_TRIDENT_PAGE_SIZE))
 214                return NULL;
 215        hdr = trident->tlb.memhdr;
 216        if (snd_BUG_ON(!hdr))
 217                return NULL;
 218
 219        mutex_lock(&hdr->block_mutex);
 220        blk = search_empty(hdr, runtime->dma_bytes);
 221        if (blk == NULL) {
 222                mutex_unlock(&hdr->block_mutex);
 223                return NULL;
 224        }
 225                           
 226        /* set TLB entries */
 227        addr = runtime->dma_addr;
 228        for (page = firstpg(blk); page <= lastpg(blk); page++,
 229             addr += SNDRV_TRIDENT_PAGE_SIZE) {
 230                if (! is_valid_page(addr)) {
 231                        __snd_util_mem_free(hdr, blk);
 232                        mutex_unlock(&hdr->block_mutex);
 233                        return NULL;
 234                }
 235                set_tlb_bus(trident, page, addr);
 236        }
 237        mutex_unlock(&hdr->block_mutex);
 238        return blk;
 239}
 240
 241/*
 242 * page allocation for DMA
 243 */
 244struct snd_util_memblk *
 245snd_trident_alloc_pages(struct snd_trident *trident,
 246                        struct snd_pcm_substream *substream)
 247{
 248        if (snd_BUG_ON(!trident || !substream))
 249                return NULL;
 250        if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
 251                return snd_trident_alloc_sg_pages(trident, substream);
 252        else
 253                return snd_trident_alloc_cont_pages(trident, substream);
 254}
 255
 256
 257/*
 258 * release DMA buffer from page table
 259 */
 260int snd_trident_free_pages(struct snd_trident *trident,
 261                           struct snd_util_memblk *blk)
 262{
 263        struct snd_util_memhdr *hdr;
 264        int page;
 265
 266        if (snd_BUG_ON(!trident || !blk))
 267                return -EINVAL;
 268
 269        hdr = trident->tlb.memhdr;
 270        mutex_lock(&hdr->block_mutex);
 271        /* reset TLB entries */
 272        for (page = firstpg(blk); page <= lastpg(blk); page++)
 273                set_silent_tlb(trident, page);
 274        /* free memory block */
 275        __snd_util_mem_free(hdr, blk);
 276        mutex_unlock(&hdr->block_mutex);
 277        return 0;
 278}
 279