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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,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 }
300 

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