| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| * Copyright (c) by Takashi Iwai <tiwai@suse.de> |
| * Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au> |
| * |
| * Trident 4DWave-NX memory page allocation (TLB area) |
| * Trident chip can handle only 16MByte of the memory at the same time. |
| */ |
| |
| #include <linux/io.h> |
| #include <linux/pci.h> |
| #include <linux/time.h> |
| #include <linux/mutex.h> |
| |
| #include <sound/core.h> |
| #include "trident.h" |
| |
| /* page arguments of these two macros are Trident page (4096 bytes), not like |
| * aligned pages in others |
| */ |
| #define __set_tlb_bus(trident,page,addr) \ |
| (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)) |
| #define __tlb_to_addr(trident,page) \ |
| (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1)) |
| |
| #if PAGE_SIZE == 4096 |
| /* page size == SNDRV_TRIDENT_PAGE_SIZE */ |
| #define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */ |
| #define MAX_ALIGN_PAGES SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */ |
| /* fill TLB entrie(s) corresponding to page with ptr */ |
| #define set_tlb_bus(trident,page,addr) __set_tlb_bus(trident,page,addr) |
| /* fill TLB entrie(s) corresponding to page with silence pointer */ |
| #define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, trident->tlb.silent_page.addr) |
| /* get aligned page from offset address */ |
| #define get_aligned_page(offset) ((offset) >> 12) |
| /* get offset address from aligned page */ |
| #define aligned_page_offset(page) ((page) << 12) |
| /* get PCI physical address from aligned page */ |
| #define page_to_addr(trident,page) __tlb_to_addr(trident, page) |
| |
| #elif PAGE_SIZE == 8192 |
| /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/ |
| #define ALIGN_PAGE_SIZE PAGE_SIZE |
| #define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / 2) |
| #define get_aligned_page(offset) ((offset) >> 13) |
| #define aligned_page_offset(page) ((page) << 13) |
| #define page_to_addr(trident,page) __tlb_to_addr(trident, (page) << 1) |
| |
| /* fill TLB entries -- we need to fill two entries */ |
| static inline void set_tlb_bus(struct snd_trident *trident, int page, |
| dma_addr_t addr) |
| { |
| page <<= 1; |
| __set_tlb_bus(trident, page, addr); |
| __set_tlb_bus(trident, page+1, addr + SNDRV_TRIDENT_PAGE_SIZE); |
| } |
| static inline void set_silent_tlb(struct snd_trident *trident, int page) |
| { |
| page <<= 1; |
| __set_tlb_bus(trident, page, trident->tlb.silent_page.addr); |
| __set_tlb_bus(trident, page+1, trident->tlb.silent_page.addr); |
| } |
| |
| #else |
| /* arbitrary size */ |
| #define UNIT_PAGES (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE) |
| #define ALIGN_PAGE_SIZE (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES) |
| #define MAX_ALIGN_PAGES (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES) |
| /* Note: if alignment doesn't match to the maximum size, the last few blocks |
| * become unusable. To use such blocks, you'll need to check the validity |
| * of accessing page in set_tlb_bus and set_silent_tlb. search_empty() |
| * should also check it, too. |
| */ |
| #define get_aligned_page(offset) ((offset) / ALIGN_PAGE_SIZE) |
| #define aligned_page_offset(page) ((page) * ALIGN_PAGE_SIZE) |
| #define page_to_addr(trident,page) __tlb_to_addr(trident, (page) * UNIT_PAGES) |
| |
| /* fill TLB entries -- UNIT_PAGES entries must be filled */ |
| static inline void set_tlb_bus(struct snd_trident *trident, int page, |
| dma_addr_t addr) |
| { |
| int i; |
| page *= UNIT_PAGES; |
| for (i = 0; i < UNIT_PAGES; i++, page++) { |
| __set_tlb_bus(trident, page, addr); |
| addr += SNDRV_TRIDENT_PAGE_SIZE; |
| } |
| } |
| static inline void set_silent_tlb(struct snd_trident *trident, int page) |
| { |
| int i; |
| page *= UNIT_PAGES; |
| for (i = 0; i < UNIT_PAGES; i++, page++) |
| __set_tlb_bus(trident, page, trident->tlb.silent_page.addr); |
| } |
| |
| #endif /* PAGE_SIZE */ |
| |
| /* first and last (aligned) pages of memory block */ |
| #define firstpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page) |
| #define lastpg(blk) (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page) |
| |
| /* |
| * search empty pages which may contain given size |
| */ |
| static struct snd_util_memblk * |
| search_empty(struct snd_util_memhdr *hdr, int size) |
| { |
| struct snd_util_memblk *blk; |
| int page, psize; |
| struct list_head *p; |
| |
| psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1); |
| page = 0; |
| list_for_each(p, &hdr->block) { |
| blk = list_entry(p, struct snd_util_memblk, list); |
| if (page + psize <= firstpg(blk)) |
| goto __found_pages; |
| page = lastpg(blk) + 1; |
| } |
| if (page + psize > MAX_ALIGN_PAGES) |
| return NULL; |
| |
| __found_pages: |
| /* create a new memory block */ |
| blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev); |
| if (blk == NULL) |
| return NULL; |
| blk->offset = aligned_page_offset(page); /* set aligned offset */ |
| firstpg(blk) = page; |
| lastpg(blk) = page + psize - 1; |
| return blk; |
| } |
| |
| |
| /* |
| * check if the given pointer is valid for pages |
| */ |
| static int is_valid_page(unsigned long ptr) |
| { |
| if (ptr & ~0x3fffffffUL) { |
| snd_printk(KERN_ERR "max memory size is 1GB!!\n"); |
| return 0; |
| } |
| if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) { |
| snd_printk(KERN_ERR "page is not aligned\n"); |
| return 0; |
| } |
| return 1; |
| } |
| |
| /* |
| * page allocation for DMA (Scatter-Gather version) |
| */ |
| static struct snd_util_memblk * |
| snd_trident_alloc_sg_pages(struct snd_trident *trident, |
| struct snd_pcm_substream *substream) |
| { |
| struct snd_util_memhdr *hdr; |
| struct snd_util_memblk *blk; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| int idx, page; |
| |
| if (snd_BUG_ON(runtime->dma_bytes <= 0 || |
| runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES * |
| SNDRV_TRIDENT_PAGE_SIZE)) |
| return NULL; |
| hdr = trident->tlb.memhdr; |
| if (snd_BUG_ON(!hdr)) |
| return NULL; |
| |
| |
| |
| mutex_lock(&hdr->block_mutex); |
| blk = search_empty(hdr, runtime->dma_bytes); |
| if (blk == NULL) { |
| mutex_unlock(&hdr->block_mutex); |
| return NULL; |
| } |
| |
| /* set TLB entries */ |
| idx = 0; |
| for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) { |
| unsigned long ofs = idx << PAGE_SHIFT; |
| dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs); |
| if (! is_valid_page(addr)) { |
| __snd_util_mem_free(hdr, blk); |
| mutex_unlock(&hdr->block_mutex); |
| return NULL; |
| } |
| set_tlb_bus(trident, page, addr); |
| } |
| mutex_unlock(&hdr->block_mutex); |
| return blk; |
| } |
| |
| /* |
| * page allocation for DMA (contiguous version) |
| */ |
| static struct snd_util_memblk * |
| snd_trident_alloc_cont_pages(struct snd_trident *trident, |
| struct snd_pcm_substream *substream) |
| { |
| struct snd_util_memhdr *hdr; |
| struct snd_util_memblk *blk; |
| int page; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| dma_addr_t addr; |
| |
| if (snd_BUG_ON(runtime->dma_bytes <= 0 || |
| runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES * |
| SNDRV_TRIDENT_PAGE_SIZE)) |
| return NULL; |
| hdr = trident->tlb.memhdr; |
| if (snd_BUG_ON(!hdr)) |
| return NULL; |
| |
| mutex_lock(&hdr->block_mutex); |
| blk = search_empty(hdr, runtime->dma_bytes); |
| if (blk == NULL) { |
| mutex_unlock(&hdr->block_mutex); |
| return NULL; |
| } |
| |
| /* set TLB entries */ |
| addr = runtime->dma_addr; |
| for (page = firstpg(blk); page <= lastpg(blk); page++, |
| addr += SNDRV_TRIDENT_PAGE_SIZE) { |
| if (! is_valid_page(addr)) { |
| __snd_util_mem_free(hdr, blk); |
| mutex_unlock(&hdr->block_mutex); |
| return NULL; |
| } |
| set_tlb_bus(trident, page, addr); |
| } |
| mutex_unlock(&hdr->block_mutex); |
| return blk; |
| } |
| |
| /* |
| * page allocation for DMA |
| */ |
| struct snd_util_memblk * |
| snd_trident_alloc_pages(struct snd_trident *trident, |
| struct snd_pcm_substream *substream) |
| { |
| if (snd_BUG_ON(!trident || !substream)) |
| return NULL; |
| if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG) |
| return snd_trident_alloc_sg_pages(trident, substream); |
| else |
| return snd_trident_alloc_cont_pages(trident, substream); |
| } |
| |
| |
| /* |
| * release DMA buffer from page table |
| */ |
| int snd_trident_free_pages(struct snd_trident *trident, |
| struct snd_util_memblk *blk) |
| { |
| struct snd_util_memhdr *hdr; |
| int page; |
| |
| if (snd_BUG_ON(!trident || !blk)) |
| return -EINVAL; |
| |
| hdr = trident->tlb.memhdr; |
| mutex_lock(&hdr->block_mutex); |
| /* reset TLB entries */ |
| for (page = firstpg(blk); page <= lastpg(blk); page++) |
| set_silent_tlb(trident, page); |
| /* free memory block */ |
| __snd_util_mem_free(hdr, blk); |
| mutex_unlock(&hdr->block_mutex); |
| return 0; |
| } |