--- /dev/null
+/*
+ * 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.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#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,ptr,addr) \
+ do { (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1)); \
+ (trident)->tlb.shadow_entries[page] = (ptr); } while (0)
+#define __tlb_to_ptr(trident,page) \
+ (void*)((trident)->tlb.shadow_entries[page])
+#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,ptr,addr) __set_tlb_bus(trident,page,ptr,addr)
+/* fill TLB entrie(s) corresponding to page with silence pointer */
+#define set_silent_tlb(trident,page) __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, 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 buffer address from aligned page */
+#define page_to_ptr(trident,page) __tlb_to_ptr(trident, page)
+/* 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_ptr(trident,page) __tlb_to_ptr(trident, (page) << 1)
+#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,
+ unsigned long ptr, dma_addr_t addr)
+{
+ page <<= 1;
+ __set_tlb_bus(trident, page, ptr, addr);
+ __set_tlb_bus(trident, page+1, ptr + SNDRV_TRIDENT_PAGE_SIZE, addr + SNDRV_TRIDENT_PAGE_SIZE);
+}
+static inline void set_silent_tlb(struct snd_trident *trident, int page)
+{
+ page <<= 1;
+ __set_tlb_bus(trident, page, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
+ __set_tlb_bus(trident, page+1, (unsigned long)trident->tlb.silent_page.area, 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_ptr(trident,page) __tlb_to_ptr(trident, (page) * UNIT_PAGES)
+#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,
+ unsigned long ptr, dma_addr_t addr)
+{
+ int i;
+ page *= UNIT_PAGES;
+ for (i = 0; i < UNIT_PAGES; i++, page++) {
+ __set_tlb_bus(trident, page, ptr, addr);
+ ptr += SNDRV_TRIDENT_PAGE_SIZE;
+ 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, (unsigned long)trident->tlb.silent_page.area, trident->tlb.silent_page.addr);
+}
+
+#endif /* PAGE_SIZE */
+
+/* calculate buffer pointer from offset address */
+static inline void *offset_ptr(struct snd_trident *trident, int offset)
+{
+ char *ptr;
+ ptr = page_to_ptr(trident, get_aligned_page(offset));
+ ptr += offset % ALIGN_PAGE_SIZE;
+ return (void*)ptr;
+}
+
+/* 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);
+ unsigned long ptr = (unsigned long)
+ snd_pcm_sgbuf_get_ptr(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, ptr, 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;
+ unsigned long ptr;
+
+ 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;
+ ptr = (unsigned long)runtime->dma_area;
+ for (page = firstpg(blk); page <= lastpg(blk); page++,
+ ptr += SNDRV_TRIDENT_PAGE_SIZE, 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, ptr, 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;
+}
Code Review / kvmfornfv.git / blobdiff