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TOMOYO Linux Cross Reference
Linux/sound/pci/trident/trident_memory.c

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  1 /*
  2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  3  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
  4  *  Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
  5  *
  6  *  Trident 4DWave-NX memory page allocation (TLB area)
  7  *  Trident chip can handle only 16MByte of the memory at the same time.
  8  *
  9  *
 10  *   This program is free software; you can redistribute it and/or modify
 11  *   it under the terms of the GNU General Public License as published by
 12  *   the Free Software Foundation; either version 2 of the License, or
 13  *   (at your option) any later version.
 14  *
 15  *   This program is distributed in the hope that it will be useful,
 16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  *   GNU General Public License for more details.
 19  *
 20  *   You should have received a copy of the GNU General Public License
 21  *   along with this program; if not, write to the Free Software
 22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 23  *
 24  */
 25 
 26 #include <linux/io.h>
 27 #include <linux/pci.h>
 28 #include <linux/time.h>
 29 #include <linux/mutex.h>
 30 
 31 #include <sound/core.h>
 32 #include "trident.h"
 33 
 34 /* page arguments of these two macros are Trident page (4096 bytes), not like
 35  * aligned pages in others
 36  */
 37 #define __set_tlb_bus(trident,page,ptr,addr) \
 38         do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
 39              (trident)->tlb.shadow_entries[page] = (ptr); } while (0)
 40 #define __tlb_to_ptr(trident,page) \
 41         (void*)((trident)->tlb.shadow_entries[page])
 42 #define __tlb_to_addr(trident,page) \
 43         (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
 44 
 45 #if PAGE_SIZE == 4096
 46 /* page size == SNDRV_TRIDENT_PAGE_SIZE */
 47 #define ALIGN_PAGE_SIZE         PAGE_SIZE       /* minimum page size for allocation */
 48 #define MAX_ALIGN_PAGES         SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
 49 /* fill TLB entrie(s) corresponding to page with ptr */
 50 #define set_tlb_bus(trident,page,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
 51 /* fill TLB entrie(s) corresponding to page with silence pointer */
 52 #define set_silent_tlb(trident,page)    __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr)
 53 /* get aligned page from offset address */
 54 #define get_aligned_page(offset)        ((offset) >> 12)
 55 /* get offset address from aligned page */
 56 #define aligned_page_offset(page)       ((page) << 12)
 57 /* get buffer address from aligned page */
 58 #define page_to_ptr(trident,page)       __tlb_to_ptr(trident, page)
 59 /* get PCI physical address from aligned page */
 60 #define page_to_addr(trident,page)      __tlb_to_addr(trident, page)
 61 
 62 #elif PAGE_SIZE == 8192
 63 /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
 64 #define ALIGN_PAGE_SIZE         PAGE_SIZE
 65 #define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / 2)
 66 #define get_aligned_page(offset)        ((offset) >> 13)
 67 #define aligned_page_offset(page)       ((page) << 13)
 68 #define page_to_ptr(trident,page)       __tlb_to_ptr(trident, (page) << 1)
 69 #define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) << 1)
 70 
 71 /* fill TLB entries -- we need to fill two entries */
 72 static inline void set_tlb_bus(struct snd_trident *trident, int page,
 73                                unsigned long ptr, dma_addr_t addr)
 74 {
 75         page <<= 1;
 76         __set_tlb_bus(trident, page, ptr, addr);
 77         __set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
 78 }
 79 static inline void set_silent_tlb(struct snd_trident *trident, int page)
 80 {
 81         page <<= 1;
 82         __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
 83         __set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
 84 }
 85 
 86 #else
 87 /* arbitrary size */
 88 #define UNIT_PAGES              (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
 89 #define ALIGN_PAGE_SIZE         (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
 90 #define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
 91 /* Note: if alignment doesn't match to the maximum size, the last few blocks
 92  * become unusable.  To use such blocks, you'll need to check the validity
 93  * of accessing page in set_tlb_bus and set_silent_tlb.  search_empty()
 94  * should also check it, too.
 95  */
 96 #define get_aligned_page(offset)        ((offset) / ALIGN_PAGE_SIZE)
 97 #define aligned_page_offset(page)       ((page) * ALIGN_PAGE_SIZE)
 98 #define page_to_ptr(trident,page)       __tlb_to_ptr(trident, (page) * UNIT_PAGES)
 99 #define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) * UNIT_PAGES)
100 
101 /* fill TLB entries -- UNIT_PAGES entries must be filled */
102 static inline void set_tlb_bus(struct snd_trident *trident, int page,
103                                unsigned long ptr, dma_addr_t addr)
104 {
105         int i;
106         page *= UNIT_PAGES;
107         for (i = 0; i < UNIT_PAGES; i++, page++) {
108                 __set_tlb_bus(trident, page, ptr, addr);
109                 ptr += SNDRV_TRIDENT_PAGE_SIZE;
110                 addr += SNDRV_TRIDENT_PAGE_SIZE;
111         }
112 }
113 static inline void set_silent_tlb(struct snd_trident *trident, int page)
114 {
115         int i;
116         page *= UNIT_PAGES;
117         for (i = 0; i < UNIT_PAGES; i++, page++)
118                 __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
119 }
120 
121 #endif /* PAGE_SIZE */
122 
123 /* calculate buffer pointer from offset address */
124 static inline void *offset_ptr(struct snd_trident *trident, int offset)
125 {
126         char *ptr;
127         ptr = page_to_ptr(trident, get_aligned_page(offset));
128         ptr += offset % ALIGN_PAGE_SIZE;
129         return (void*)ptr;
130 }
131 
132 /* first and last (aligned) pages of memory block */
133 #define firstpg(blk)    (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
134 #define lastpg(blk)     (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
135 
136 /*
137  * search empty pages which may contain given size
138  */
139 static struct snd_util_memblk *
140 search_empty(struct snd_util_memhdr *hdr, int size)
141 {
142         struct snd_util_memblk *blk;
143         int page, psize;
144         struct list_head *p;
145 
146         psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
147         page = 0;
148         list_for_each(p, &hdr->block) {
149                 blk = list_entry(p, struct snd_util_memblk, list);
150                 if (page + psize <= firstpg(blk))
151                         goto __found_pages;
152                 page = lastpg(blk) + 1;
153         }
154         if (page + psize > MAX_ALIGN_PAGES)
155                 return NULL;
156 
157 __found_pages:
158         /* create a new memory block */
159         blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
160         if (blk == NULL)
161                 return NULL;
162         blk->offset = aligned_page_offset(page); /* set aligned offset */
163         firstpg(blk) = page;
164         lastpg(blk) = page + psize - 1;
165         return blk;
166 }
167 
168 
169 /*
170  * check if the given pointer is valid for pages
171  */
172 static int is_valid_page(unsigned long ptr)
173 {
174         if (ptr & ~0x3fffffffUL) {
175                 snd_printk(KERN_ERR "max memory size is 1GB!!\n");
176                 return 0;
177         }
178         if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
179                 snd_printk(KERN_ERR "page is not aligned\n");
180                 return 0;
181         }
182         return 1;
183 }
184 
185 /*
186  * page allocation for DMA (Scatter-Gather version)
187  */
188 static struct snd_util_memblk *
189 snd_trident_alloc_sg_pages(struct snd_trident *trident,
190                            struct snd_pcm_substream *substream)
191 {
192         struct snd_util_memhdr *hdr;
193         struct snd_util_memblk *blk;
194         struct snd_pcm_runtime *runtime = substream->runtime;
195         int idx, page;
196 
197         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
198                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
199                                         SNDRV_TRIDENT_PAGE_SIZE))
200                 return NULL;
201         hdr = trident->tlb.memhdr;
202         if (snd_BUG_ON(!hdr))
203                 return NULL;
204 
205         
206 
207         mutex_lock(&hdr->block_mutex);
208         blk = search_empty(hdr, runtime->dma_bytes);
209         if (blk == NULL) {
210                 mutex_unlock(&hdr->block_mutex);
211                 return NULL;
212         }
213                            
214         /* set TLB entries */
215         idx = 0;
216         for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
217                 unsigned long ofs = idx << PAGE_SHIFT;
218                 dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
219                 unsigned long ptr = (unsigned long)
220                         snd_pcm_sgbuf_get_ptr(substream, ofs);
221                 if (! is_valid_page(addr)) {
222                         __snd_util_mem_free(hdr, blk);
223                         mutex_unlock(&hdr->block_mutex);
224                         return NULL;
225                 }
226                 set_tlb_bus(trident, page, ptr, addr);
227         }
228         mutex_unlock(&hdr->block_mutex);
229         return blk;
230 }
231 
232 /*
233  * page allocation for DMA (contiguous version)
234  */
235 static struct snd_util_memblk *
236 snd_trident_alloc_cont_pages(struct snd_trident *trident,
237                              struct snd_pcm_substream *substream)
238 {
239         struct snd_util_memhdr *hdr;
240         struct snd_util_memblk *blk;
241         int page;
242         struct snd_pcm_runtime *runtime = substream->runtime;
243         dma_addr_t addr;
244         unsigned long ptr;
245 
246         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
247                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
248                                         SNDRV_TRIDENT_PAGE_SIZE))
249                 return NULL;
250         hdr = trident->tlb.memhdr;
251         if (snd_BUG_ON(!hdr))
252                 return NULL;
253 
254         mutex_lock(&hdr->block_mutex);
255         blk = search_empty(hdr, runtime->dma_bytes);
256         if (blk == NULL) {
257                 mutex_unlock(&hdr->block_mutex);
258                 return NULL;
259         }
260                            
261         /* set TLB entries */
262         addr = runtime->dma_addr;
263         ptr = (unsigned long)runtime->dma_area;
264         for (page = firstpg(blk); page <= lastpg(blk); page++,
265              ptr += SNDRV_TRIDENT_PAGE_SIZE, addr += SNDRV_TRIDENT_PAGE_SIZE) {
266                 if (! is_valid_page(addr)) {
267                         __snd_util_mem_free(hdr, blk);
268                         mutex_unlock(&hdr->block_mutex);
269                         return NULL;
270                 }
271                 set_tlb_bus(trident, page, ptr, addr);
272         }
273         mutex_unlock(&hdr->block_mutex);
274         return blk;
275 }
276 
277 /*
278  * page allocation for DMA
279  */
280 struct snd_util_memblk *
281 snd_trident_alloc_pages(struct snd_trident *trident,
282                         struct snd_pcm_substream *substream)
283 {
284         if (snd_BUG_ON(!trident || !substream))
285                 return NULL;
286         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
287                 return snd_trident_alloc_sg_pages(trident, substream);
288         else
289                 return snd_trident_alloc_cont_pages(trident, substream);
290 }
291 
292 
293 /*
294  * release DMA buffer from page table
295  */
296 int snd_trident_free_pages(struct snd_trident *trident,
297                            struct snd_util_memblk *blk)
298 {
299         struct snd_util_memhdr *hdr;
300         int page;
301 
302         if (snd_BUG_ON(!trident || !blk))
303                 return -EINVAL;
304 
305         hdr = trident->tlb.memhdr;
306         mutex_lock(&hdr->block_mutex);
307         /* reset TLB entries */
308         for (page = firstpg(blk); page <= lastpg(blk); page++)
309                 set_silent_tlb(trident, page);
310         /* free memory block */
311         __snd_util_mem_free(hdr, blk);
312         mutex_unlock(&hdr->block_mutex);
313         return 0;
314 }
315 

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