sound/pci/trident/trident_memory.c

   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,ptr,addr) \
  23         do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
  24              (trident)->tlb.shadow_entries[page] = (ptr); } while (0)
  25 #define __tlb_to_ptr(trident,page) \
  26         (void*)((trident)->tlb.shadow_entries[page])
  27 #define __tlb_to_addr(trident,page) \
  28         (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
  29
  30 #if PAGE_SIZE == 4096
  31 /* page size == SNDRV_TRIDENT_PAGE_SIZE */
  32 #define ALIGN_PAGE_SIZE         PAGE_SIZE       /* minimum page size for allocation */
  33 #define MAX_ALIGN_PAGES         SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
  34 /* fill TLB entrie(s) corresponding to page with ptr */
  35 #define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
  36 /* fill TLB entrie(s) corresponding to page with silence pointer */
  37 #define set_silent_tlb(trident,page)    __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
  38 /* get aligned page from offset address */
  39 #define get_aligned_page(offset)        ((offset) >> 12)
  40 /* get offset address from aligned page */
  41 #define aligned_page_offset(page)       ((page) << 12)
  42 /* get buffer address from aligned page */
  43 #define page_to_ptr(trident,page)       __tlb_to_ptr(trident, page)
  44 /* get PCI physical address from aligned page */
  45 #define page_to_addr(trident,page)      __tlb_to_addr(trident, page)
  46
  47 #elif PAGE_SIZE == 8192
  48 /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
  49 #define ALIGN_PAGE_SIZE         PAGE_SIZE
  50 #define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / 2)
  51 #define get_aligned_page(offset)        ((offset) >> 13)
  52 #define aligned_page_offset(page)       ((page) << 13)
  53 #define page_to_ptr(trident,page)       __tlb_to_ptr(trident, (page) << 1)
  54 #define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) << 1)
  55
  56 /* fill TLB entries -- we need to fill two entries */
  57 static inline void set_tlb_bus(struct snd_trident *trident, int page,
  58                                unsigned long ptr, dma_addr_t addr)
  59 {
  60         page <<= 1;
  61         __set_tlb_bus(trident, page, ptr, addr);
  62         __set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
  63 }
  64 static inline void set_silent_tlb(struct snd_trident *trident, int page)
  65 {
  66         page <<= 1;
  67         __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
  68         __set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
  69 }
  70
  71 #else
  72 /* arbitrary size */
  73 #define UNIT_PAGES              (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
  74 #define ALIGN_PAGE_SIZE         (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
  75 #define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
  76 /* Note: if alignment doesn't match to the maximum size, the last few blocks
  77  * become unusable.  To use such blocks, you'll need to check the validity
  78  * of accessing page in set_tlb_bus and set_silent_tlb.  search_empty()
  79  * should also check it, too.
  80  */
  81 #define get_aligned_page(offset)        ((offset) / ALIGN_PAGE_SIZE)
  82 #define aligned_page_offset(page)       ((page) * ALIGN_PAGE_SIZE)
  83 #define page_to_ptr(trident,page)       __tlb_to_ptr(trident, (page) * UNIT_PAGES)
  84 #define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) * UNIT_PAGES)
  85
  86 /* fill TLB entries -- UNIT_PAGES entries must be filled */
  87 static inline void set_tlb_bus(struct snd_trident *trident, int page,
  88                                unsigned long ptr, dma_addr_t addr)
  89 {
  90         int i;
  91         page *= UNIT_PAGES;
  92         for (i = 0; i < UNIT_PAGES; i++, page++) {
  93                 __set_tlb_bus(trident, page, ptr, addr);
  94                 ptr += SNDRV_TRIDENT_PAGE_SIZE;
  95                 addr += SNDRV_TRIDENT_PAGE_SIZE;
  96         }
  97 }
  98 static inline void set_silent_tlb(struct snd_trident *trident, int page)
  99 {
 100         int i;
 101         page *= UNIT_PAGES;
 102         for (i = 0; i < UNIT_PAGES; i++, page++)
 103                 __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
 104 }
 105
 106 #endif /* PAGE_SIZE */
 107
 108 /* calculate buffer pointer from offset address */
 109 static inline void *offset_ptr(struct snd_trident *trident, int offset)
 110 {
 111         char *ptr;
 112         ptr = page_to_ptr(trident, get_aligned_page(offset));
 113         ptr += offset % ALIGN_PAGE_SIZE;
 114         return (void*)ptr;
 115 }
 116
 117 /* first and last (aligned) pages of memory block */
 118 #define firstpg(blk)    (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
 119 #define lastpg(blk)     (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
 120
 121 /*
 122  * search empty pages which may contain given size
 123  */
 124 static struct snd_util_memblk *
 125 search_empty(struct snd_util_memhdr *hdr, int size)
 126 {
 127         struct snd_util_memblk *blk;
 128         int page, psize;
 129         struct list_head *p;
 130
 131         psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
 132         page = 0;
 133         list_for_each(p, &hdr->block) {
 134                 blk = list_entry(p, struct snd_util_memblk, list);
 135                 if (page + psize <= firstpg(blk))
 136                         goto __found_pages;
 137                 page = lastpg(blk) + 1;
 138         }
 139         if (page + psize > MAX_ALIGN_PAGES)
 140                 return NULL;
 141
 142 __found_pages:
 143         /* create a new memory block */
 144         blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
 145         if (blk == NULL)
 146                 return NULL;
 147         blk->offset = aligned_page_offset(page); /* set aligned offset */
 148         firstpg(blk) = page;
 149         lastpg(blk) = page + psize - 1;
 150         return blk;
 151 }
 152
 153
 154 /*
 155  * check if the given pointer is valid for pages
 156  */
 157 static int is_valid_page(unsigned long ptr)
 158 {
 159         if (ptr & ~0x3fffffffUL) {
 160                 snd_printk(KERN_ERR "max memory size is 1GB!!\n");
 161                 return 0;
 162         }
 163         if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
 164                 snd_printk(KERN_ERR "page is not aligned\n");
 165                 return 0;
 166         }
 167         return 1;
 168 }
 169
 170 /*
 171  * page allocation for DMA (Scatter-Gather version)
 172  */
 173 static struct snd_util_memblk *
 174 snd_trident_alloc_sg_pages(struct snd_trident *trident,
 175                            struct snd_pcm_substream *substream)
 176 {
 177         struct snd_util_memhdr *hdr;
 178         struct snd_util_memblk *blk;
 179         struct snd_pcm_runtime *runtime = substream->runtime;
 180         int idx, page;
 181
 182         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 183                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
 184                                         SNDRV_TRIDENT_PAGE_SIZE))
 185                 return NULL;
 186         hdr = trident->tlb.memhdr;
 187         if (snd_BUG_ON(!hdr))
 188                 return NULL;
 189
 190
 191
 192         mutex_lock(&hdr->block_mutex);
 193         blk = search_empty(hdr, runtime->dma_bytes);
 194         if (blk == NULL) {
 195                 mutex_unlock(&hdr->block_mutex);
 196                 return NULL;
 197         }
 198
 199         /* set TLB entries */
 200         idx = 0;
 201         for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
 202                 unsigned long ofs = idx << PAGE_SHIFT;
 203                 dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 204                 unsigned long ptr = (unsigned long)
 205                         snd_pcm_sgbuf_get_ptr(substream, ofs);
 206                 if (! is_valid_page(addr)) {
 207                         __snd_util_mem_free(hdr, blk);
 208                         mutex_unlock(&hdr->block_mutex);
 209                         return NULL;
 210                 }
 211                 set_tlb_bus(trident, page, ptr, addr);
 212         }
 213         mutex_unlock(&hdr->block_mutex);
 214         return blk;
 215 }
 216
 217 /*
 218  * page allocation for DMA (contiguous version)
 219  */
 220 static struct snd_util_memblk *
 221 snd_trident_alloc_cont_pages(struct snd_trident *trident,
 222                              struct snd_pcm_substream *substream)
 223 {
 224         struct snd_util_memhdr *hdr;
 225         struct snd_util_memblk *blk;
 226         int page;
 227         struct snd_pcm_runtime *runtime = substream->runtime;
 228         dma_addr_t addr;
 229         unsigned long ptr;
 230
 231         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 232                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
 233                                         SNDRV_TRIDENT_PAGE_SIZE))
 234                 return NULL;
 235         hdr = trident->tlb.memhdr;
 236         if (snd_BUG_ON(!hdr))
 237                 return NULL;
 238
 239         mutex_lock(&hdr->block_mutex);
 240         blk = search_empty(hdr, runtime->dma_bytes);
 241         if (blk == NULL) {
 242                 mutex_unlock(&hdr->block_mutex);
 243                 return NULL;
 244         }
 245
 246         /* set TLB entries */
 247         addr = runtime->dma_addr;
 248         ptr = (unsigned long)runtime->dma_area;
 249         for (page = firstpg(blk); page <= lastpg(blk); page++,
 250              ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
 251                 if (! is_valid_page(addr)) {
 252                         __snd_util_mem_free(hdr, blk);
 253                         mutex_unlock(&hdr->block_mutex);
 254                         return NULL;
 255                 }
 256                 set_tlb_bus(trident, page, ptr, addr);
 257         }
 258         mutex_unlock(&hdr->block_mutex);
 259         return blk;
 260 }
 261
 262 /*
 263  * page allocation for DMA
 264  */
 265 struct snd_util_memblk *
 266 snd_trident_alloc_pages(struct snd_trident *trident,
 267                         struct snd_pcm_substream *substream)
 268 {
 269         if (snd_BUG_ON(!trident || !substream))
 270                 return NULL;
 271         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
 272                 return snd_trident_alloc_sg_pages(trident, substream);
 273         else
 274                 return snd_trident_alloc_cont_pages(trident, substream);
 275 }
 276
 277
 278 /*
 279  * release DMA buffer from page table
 280  */
 281 int snd_trident_free_pages(struct snd_trident *trident,
 282                            struct snd_util_memblk *blk)
 283 {
 284         struct snd_util_memhdr *hdr;
 285         int page;
 286
 287         if (snd_BUG_ON(!trident || !blk))
 288                 return -EINVAL;
 289
 290         hdr = trident->tlb.memhdr;
 291         mutex_lock(&hdr->block_mutex);
 292         /* reset TLB entries */
 293         for (page = firstpg(blk); page <= lastpg(blk); page++)
 294                 set_silent_tlb(trident, page);
 295         /* free memory block */
 296         __snd_util_mem_free(hdr, blk);
 297         mutex_unlock(&hdr->block_mutex);
 298         return 0;
 299 }